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First commit with working display

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Ricardo LAP
2026-09-13 20:50:51 +00:00
parent a83af259b3
commit c54c68c899
6690 changed files with 1093387 additions and 2 deletions
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9
managed_components/lvgl__lvgl/examples/widgets/animimg/index.rst Normal file
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.. example_heading: Animation Image
Simple Animation Image
----------------------
.. lv_example:: widgets/animimg/lv_example_animimg_1
:language: c
:description: A simple example to demonstrate the use of an animation image.

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managed_components/lvgl__lvgl/examples/widgets/animimg/lv_example_animimg_1.c Normal file
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#include "../../lv_examples.h"
#if LV_USE_ANIMIMG && LV_BUILD_EXAMPLES
LV_IMAGE_DECLARE(animimg001);
LV_IMAGE_DECLARE(animimg002);
LV_IMAGE_DECLARE(animimg003);
static const lv_image_dsc_t * anim_imgs[3] = {
&animimg001,
& animimg002,
& animimg003,
};
void lv_example_animimg_1(void)
{
lv_obj_t * animimg0 = lv_animimg_create(lv_screen_active());
lv_obj_center(animimg0);
lv_animimg_set_src(animimg0, (const void **) anim_imgs, 3);
lv_animimg_set_duration(animimg0, 1000);
lv_animimg_set_repeat_count(animimg0, LV_ANIM_REPEAT_INFINITE);
lv_animimg_start(animimg0);
}
#endif

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managed_components/lvgl__lvgl/examples/widgets/arc/index.rst Normal file
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Simple Arc
----------
.. lv_example:: widgets/arc/lv_example_arc_1
:language: c
:description: A simple example to demonstrate the use of an arc.
Loader with Arc
---------------
.. lv_example:: widgets/arc/lv_example_arc_2
:language: c
Pie Chart with clickable slices using Arcs
------------------------------------------
.. lv_example:: widgets/arc/lv_example_arc_3
:language: c

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managed_components/lvgl__lvgl/examples/widgets/arc/lv_example_arc_1.c Normal file
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#include "../../lv_examples.h"
#if LV_USE_ARC && LV_BUILD_EXAMPLES
static void value_changed_event_cb(lv_event_t * e);
void lv_example_arc_1(void)
{
lv_obj_t * label = lv_label_create(lv_screen_active());
/*Create an Arc*/
lv_obj_t * arc = lv_arc_create(lv_screen_active());
lv_obj_set_size(arc, 150, 150);
lv_arc_set_rotation(arc, 135);
lv_arc_set_bg_angles(arc, 0, 270);
lv_arc_set_value(arc, 10);
lv_obj_center(arc);
lv_obj_add_event_cb(arc, value_changed_event_cb, LV_EVENT_VALUE_CHANGED, label);
/*Manually update the label for the first time*/
lv_obj_send_event(arc, LV_EVENT_VALUE_CHANGED, NULL);
}
static void value_changed_event_cb(lv_event_t * e)
{
lv_obj_t * arc = lv_event_get_target_obj(e);
lv_obj_t * label = (lv_obj_t *)lv_event_get_user_data(e);
lv_label_set_text_fmt(label, "%" LV_PRId32 "%%", lv_arc_get_value(arc));
/*Rotate the label to the current position of the arc*/
lv_arc_rotate_obj_to_angle(arc, label, 25);
}
#endif

35
managed_components/lvgl__lvgl/examples/widgets/arc/lv_example_arc_2.c Normal file
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#include "../../lv_examples.h"
#if LV_USE_ARC && LV_BUILD_EXAMPLES
static void set_angle(void * obj, int32_t v)
{
lv_arc_set_value((lv_obj_t *)obj, v);
}
/**
* Create an arc which acts as a loader.
*/
void lv_example_arc_2(void)
{
/*Create an Arc*/
lv_obj_t * arc = lv_arc_create(lv_screen_active());
lv_arc_set_rotation(arc, 270);
lv_arc_set_bg_angles(arc, 0, 360);
lv_obj_remove_style(arc, NULL, LV_PART_KNOB); /*Be sure the knob is not displayed*/
lv_obj_remove_flag(arc, LV_OBJ_FLAG_CLICKABLE); /*To not allow adjusting by click*/
lv_obj_center(arc);
lv_anim_t a;
lv_anim_init(&a);
lv_anim_set_var(&a, arc);
lv_anim_set_exec_cb(&a, set_angle);
lv_anim_set_duration(&a, 1000);
lv_anim_set_repeat_count(&a, LV_ANIM_REPEAT_INFINITE); /*Just for the demo*/
lv_anim_set_repeat_delay(&a, 500);
lv_anim_set_values(&a, 0, 100);
lv_anim_start(&a);
}
#endif

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managed_components/lvgl__lvgl/examples/widgets/arc/lv_example_arc_3.c Normal file
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#include "../../lv_examples.h"
#if LV_USE_ARC && LV_BUILD_EXAMPLES
#define CHART_SIZE 150
#define SLICE_OFFSET 20
typedef struct {
int start_angle;
int end_angle;
int mid_angle;
lv_point_t home;
bool out;
} slice_info_t;
typedef struct {
lv_obj_t * obj;
int start_x;
int start_y;
int end_x;
int end_y;
} slice_anim_data_t;
static float angle_accum = 0.0f;
static slice_info_t * active_info = NULL;
static lv_obj_t * active_arc = NULL;
static void anim_move_cb(void * var, int32_t v)
{
slice_anim_data_t * d = (slice_anim_data_t *) var;
int32_t x = d->start_x + ((d->end_x - d->start_x) * v) / 100;
int32_t y = d->start_y + ((d->end_y - d->start_y) * v) / 100;
lv_obj_set_pos(d->obj, x, y);
}
static void anim_cleanup_cb(lv_anim_t * a)
{
lv_free(a->var);
}
static void arc_click_cb(lv_event_t * e)
{
lv_obj_t * arc = lv_event_get_target_obj(e);
slice_info_t * info = (slice_info_t *)lv_event_get_user_data(e);
int32_t x_off = (SLICE_OFFSET * lv_trigo_cos(info->mid_angle)) >> LV_TRIGO_SHIFT;
int32_t y_off = (SLICE_OFFSET * lv_trigo_sin(info->mid_angle)) >> LV_TRIGO_SHIFT;
if(active_info && active_info != info && active_info->out) {
slice_anim_data_t * anim_back = (slice_anim_data_t *) lv_malloc(sizeof(slice_anim_data_t));
anim_back->obj = active_arc;
anim_back->start_x = lv_obj_get_x(active_arc) - SLICE_OFFSET;
anim_back->start_y = lv_obj_get_y(active_arc) - SLICE_OFFSET;
anim_back->end_x = active_info->home.x;
anim_back->end_y = active_info->home.y;
active_info->out = false;
lv_anim_t a;
lv_anim_init(&a);
lv_anim_set_var(&a, anim_back);
lv_anim_set_exec_cb(&a, anim_move_cb);
lv_anim_set_duration(&a, 200);
lv_anim_set_values(&a, 0, 100);
lv_anim_set_deleted_cb(&a, anim_cleanup_cb);
lv_anim_start(&a);
}
int target_x, target_y;
if(info->out) {
target_x = info->home.x;
target_y = info->home.y;
info->out = false;
active_info = NULL;
active_arc = NULL;
}
else {
target_x = info->home.x + x_off;
target_y = info->home.y + y_off;
info->out = true;
active_info = info;
active_arc = arc;
}
slice_anim_data_t * anim_data = (slice_anim_data_t *) lv_malloc(sizeof(slice_anim_data_t));
anim_data->obj = arc;
anim_data->start_x = lv_obj_get_x(arc) - SLICE_OFFSET;
anim_data->start_y = lv_obj_get_y(arc) - SLICE_OFFSET;
anim_data->end_x = target_x;
anim_data->end_y = target_y;
lv_anim_t a;
lv_anim_init(&a);
lv_anim_set_var(&a, anim_data);
lv_anim_set_exec_cb(&a, anim_move_cb);
lv_anim_set_duration(&a, 200);
lv_anim_set_values(&a, 0, 100);
lv_anim_set_deleted_cb(&a, anim_cleanup_cb);
lv_anim_start(&a);
}
static void create_slice(lv_obj_t * parent, int percentage, lv_color_t color)
{
if(percentage <= 0) return;
float slice_angle = (percentage * 360.0f) / 100.0f;
int start = (int)(angle_accum + 0.5f);
angle_accum += slice_angle;
int end = (int)(angle_accum + 0.5f);
if(end > 360) end = 360;
lv_obj_t * arc = lv_arc_create(parent);
lv_obj_set_size(arc, CHART_SIZE, CHART_SIZE);
lv_obj_center(arc);
lv_arc_set_mode(arc, LV_ARC_MODE_NORMAL);
lv_arc_set_bg_start_angle(arc, start);
lv_arc_set_bg_end_angle(arc, end);
lv_obj_set_style_arc_width(arc, CHART_SIZE / 2, LV_PART_MAIN);
lv_obj_set_style_arc_width(arc, 0, LV_PART_INDICATOR);
lv_obj_set_style_arc_color(arc, color, LV_PART_MAIN);
lv_obj_set_style_arc_rounded(arc, false, LV_PART_MAIN);
lv_obj_remove_style(arc, NULL, LV_PART_KNOB);
lv_obj_add_flag(arc, LV_OBJ_FLAG_ADV_HITTEST);
lv_obj_t * label = lv_label_create(arc);
lv_label_set_text_fmt(label, "%d%%", percentage);
int mid_angle = start + ((end - start) / 2);
int radius = CHART_SIZE / 4;
int x_offset = (radius * lv_trigo_cos(mid_angle)) >> LV_TRIGO_SHIFT;
int y_offset = (radius * lv_trigo_sin(mid_angle)) >> LV_TRIGO_SHIFT;
lv_obj_align(label, LV_ALIGN_CENTER, x_offset, y_offset);
slice_info_t * info = (slice_info_t *) lv_malloc(sizeof(slice_info_t));
info->start_angle = start;
info->end_angle = end;
info->mid_angle = mid_angle;
info->out = false;
info->home.x = lv_obj_get_x(arc);
info->home.y = lv_obj_get_y(arc);
lv_obj_add_event_cb(arc, arc_click_cb, LV_EVENT_CLICKED, info);
}
void lv_example_arc_3(void)
{
/* Root container: flex row */
lv_obj_t * root = lv_obj_create(lv_screen_active());
lv_obj_set_size(root, LV_SIZE_CONTENT, LV_SIZE_CONTENT);
lv_obj_center(root);
lv_obj_set_flex_flow(root, LV_FLEX_FLOW_ROW);
lv_obj_set_flex_align(root, LV_FLEX_ALIGN_CENTER, LV_FLEX_ALIGN_CENTER, LV_FLEX_ALIGN_CENTER);
lv_obj_set_style_pad_all(root, 0, LV_PART_MAIN);
lv_obj_set_style_border_width(root, 0, LV_PART_MAIN);
lv_obj_set_style_border_color(root, lv_palette_main(LV_PALETTE_RED), LV_PART_MAIN);
lv_obj_set_style_bg_opa(root, LV_OPA_TRANSP, LV_PART_MAIN);
lv_obj_remove_flag(root, LV_OBJ_FLAG_SCROLLABLE);
/* Slices container */
lv_obj_t * slices_container = lv_obj_create(root);
lv_obj_set_size(slices_container, CHART_SIZE + 2 * SLICE_OFFSET, CHART_SIZE + 2 * SLICE_OFFSET);
lv_obj_set_style_pad_all(slices_container, 0, LV_PART_MAIN);
lv_obj_set_style_margin_all(slices_container, 0, LV_PART_MAIN);
lv_obj_set_style_border_width(slices_container, 0, LV_PART_MAIN);
lv_obj_set_style_border_color(slices_container, lv_palette_main(LV_PALETTE_BLUE), LV_PART_MAIN);
lv_obj_set_style_bg_opa(slices_container, LV_OPA_TRANSP, LV_PART_MAIN);
lv_obj_remove_flag(slices_container, LV_OBJ_FLAG_SCROLLABLE);
/* Create slices */
angle_accum = 0.0f;
create_slice(slices_container, 12, lv_palette_main(LV_PALETTE_RED));
create_slice(slices_container, 18, lv_palette_main(LV_PALETTE_BLUE));
create_slice(slices_container, 26, lv_palette_main(LV_PALETTE_GREEN));
create_slice(slices_container, 24, lv_palette_main(LV_PALETTE_ORANGE));
create_slice(slices_container, 20, lv_palette_main(LV_PALETTE_BLUE_GREY));
}
#endif

9
managed_components/lvgl__lvgl/examples/widgets/arclabel/index.rst Normal file
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.. example_heading: Arc Label
Simple Arc Label
----------------
.. lv_example:: widgets/arclabel/lv_example_arclabel_1
:language: c
:description: A simple example to demonstrate the use of an arc label.

80
managed_components/lvgl__lvgl/examples/widgets/arclabel/lv_example_arclabel_1.c Normal file
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#include "../../lv_examples.h"
#if LV_USE_ARCLABEL && LV_BUILD_EXAMPLES
static const char * ARCLABEL_TEXT =
"I'm on an #FA7C45 ARC#! Centered with #12c2E9 C##8B68E8 O##c471ed L##B654E5 O##C84AB2 R##DB417A F##f64659 U##ff8888 L# feature!\n";
void lv_example_arclabel_1(void)
{
lv_obj_t * arclabel_inner = NULL;
lv_obj_t * arclabel_outer = NULL;
lv_obj_t * arclabel_slogan_1 = NULL;
lv_obj_t * arclabel_slogan_2 = NULL;
lv_obj_set_style_bg_color(lv_screen_active(), lv_color_black(), LV_PART_MAIN);
arclabel_inner = lv_arclabel_create(lv_screen_active());
lv_obj_set_size(arclabel_inner, 200, 200);
lv_obj_set_style_text_color(arclabel_inner, lv_color_white(), LV_PART_MAIN);
lv_arclabel_set_text_static(arclabel_inner, ARCLABEL_TEXT);
lv_arclabel_set_angle_start(arclabel_inner, 180);
lv_arclabel_set_radius(arclabel_inner, LV_PCT(80));
lv_arclabel_set_recolor(arclabel_inner, true);
lv_arclabel_set_text_vertical_align(arclabel_inner, LV_ARCLABEL_TEXT_ALIGN_TRAILING);
lv_arclabel_set_dir(arclabel_inner, LV_ARCLABEL_DIR_COUNTER_CLOCKWISE);
lv_arclabel_set_text_horizontal_align(arclabel_inner, LV_ARCLABEL_TEXT_ALIGN_CENTER);
lv_obj_center(arclabel_inner);
arclabel_outer = lv_arclabel_create(lv_screen_active());
lv_obj_set_size(arclabel_outer, 200, 200);
lv_obj_set_style_text_letter_space(arclabel_outer, 2, LV_PART_MAIN);
lv_obj_set_style_text_color(arclabel_outer, lv_color_hex(0x888888), LV_PART_MAIN);
lv_arclabel_set_angle_start(arclabel_outer, -180);
lv_arclabel_set_text_static(arclabel_outer, ARCLABEL_TEXT);
lv_arclabel_set_radius(arclabel_outer, LV_PCT(100));
lv_arclabel_set_recolor(arclabel_outer, true);
lv_arclabel_set_text_vertical_align(arclabel_outer, LV_ARCLABEL_TEXT_ALIGN_LEADING);
lv_arclabel_set_dir(arclabel_outer, LV_ARCLABEL_DIR_CLOCKWISE);
lv_arclabel_set_text_horizontal_align(arclabel_outer, LV_ARCLABEL_TEXT_ALIGN_CENTER);
lv_obj_center(arclabel_outer);
arclabel_slogan_1 = lv_arclabel_create(lv_screen_active());
lv_obj_set_size(arclabel_slogan_1, 300, 200);
lv_obj_set_style_text_letter_space(arclabel_slogan_1, 2, LV_PART_MAIN);
lv_obj_set_style_text_color(arclabel_slogan_1, lv_palette_main(LV_PALETTE_AMBER), LV_PART_MAIN);
lv_arclabel_set_text_static(arclabel_slogan_1, "STAY HUNGRY");
lv_arclabel_set_offset(arclabel_slogan_1, 30);
lv_arclabel_set_radius(arclabel_slogan_1, 150);
lv_arclabel_set_recolor(arclabel_slogan_1, true);
lv_arclabel_set_text_vertical_align(arclabel_slogan_1, LV_ARCLABEL_TEXT_ALIGN_TRAILING);
lv_arclabel_set_text_horizontal_align(arclabel_slogan_1, LV_ARCLABEL_TEXT_ALIGN_CENTER);
lv_arclabel_set_dir(arclabel_slogan_1, LV_ARCLABEL_DIR_COUNTER_CLOCKWISE);
lv_obj_center(arclabel_slogan_1);
arclabel_slogan_2 = lv_arclabel_create(lv_screen_active());
lv_obj_set_size(arclabel_slogan_2, 300, 200);
lv_obj_set_style_text_letter_space(arclabel_slogan_2, 2, LV_PART_MAIN);
lv_obj_set_style_text_color(arclabel_slogan_2, lv_palette_main(LV_PALETTE_AMBER), LV_PART_MAIN);
lv_arclabel_set_text_static(arclabel_slogan_2, "STAY FOOLISH");
lv_arclabel_set_offset(arclabel_slogan_2, 30);
lv_arclabel_set_radius(arclabel_slogan_2, 150);
lv_arclabel_set_angle_start(arclabel_slogan_2, 180);
lv_arclabel_set_recolor(arclabel_slogan_2, true);
lv_arclabel_set_text_vertical_align(arclabel_slogan_2, LV_ARCLABEL_TEXT_ALIGN_TRAILING);
lv_arclabel_set_text_horizontal_align(arclabel_slogan_2, LV_ARCLABEL_TEXT_ALIGN_CENTER);
lv_arclabel_set_dir(arclabel_slogan_2, LV_ARCLABEL_DIR_COUNTER_CLOCKWISE);
lv_obj_center(arclabel_slogan_2);
#if LV_FONT_MONTSERRAT_18
lv_obj_set_style_text_font(arclabel_inner, &lv_font_montserrat_18, LV_PART_MAIN);
lv_obj_set_style_text_font(arclabel_outer, &lv_font_montserrat_18, LV_PART_MAIN);
#endif
#if LV_FONT_MONTSERRAT_24
lv_obj_set_style_text_font(arclabel_slogan_1, &lv_font_montserrat_24, LV_PART_MAIN);
lv_obj_set_style_text_font(arclabel_slogan_2, &lv_font_montserrat_24, LV_PART_MAIN);
#endif
}
#endif

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managed_components/lvgl__lvgl/examples/widgets/bar/index.rst Normal file
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Simple Bar
----------
.. lv_example:: widgets/bar/lv_example_bar_1
:language: c
Styling a bar
-------------
.. lv_example:: widgets/bar/lv_example_bar_2
:language: c
Temperature meter
-----------------
.. lv_example:: widgets/bar/lv_example_bar_3
:language: c
Stripe pattern and range value
------------------------------
.. lv_example:: widgets/bar/lv_example_bar_4
:language: c
Bar with LTR and RTL base direction
-----------------------------------
.. lv_example:: widgets/bar/lv_example_bar_5
:language: c
Custom drawer to show the current value
---------------------------------------
.. lv_example:: widgets/bar/lv_example_bar_6
:language: c
Bar with opposite direction
---------------------------
.. lv_example:: widgets/bar/lv_example_bar_7
:language: c

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managed_components/lvgl__lvgl/examples/widgets/bar/lv_example_bar_1.c Normal file
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#include "../../lv_examples.h"
#if LV_USE_BAR && LV_BUILD_EXAMPLES
void lv_example_bar_1(void)
{
lv_obj_t * bar1 = lv_bar_create(lv_screen_active());
lv_obj_set_size(bar1, 200, 20);
lv_obj_center(bar1);
lv_bar_set_value(bar1, 70, LV_ANIM_OFF);
}
#endif

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managed_components/lvgl__lvgl/examples/widgets/bar/lv_example_bar_2.c Normal file
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#include "../../lv_examples.h"
#if LV_USE_BAR && LV_BUILD_EXAMPLES
/**
* Example of styling the bar
*/
void lv_example_bar_2(void)
{
static lv_style_t style_bg;
static lv_style_t style_indic;
lv_style_init(&style_bg);
lv_style_set_border_color(&style_bg, lv_palette_main(LV_PALETTE_BLUE));
lv_style_set_border_width(&style_bg, 2);
lv_style_set_pad_all(&style_bg, 6); /*To make the indicator smaller*/
lv_style_set_radius(&style_bg, 6);
lv_style_set_anim_duration(&style_bg, 1000);
lv_style_init(&style_indic);
lv_style_set_bg_opa(&style_indic, LV_OPA_COVER);
lv_style_set_bg_color(&style_indic, lv_palette_main(LV_PALETTE_BLUE));
lv_style_set_radius(&style_indic, 3);
lv_obj_t * bar = lv_bar_create(lv_screen_active());
lv_obj_remove_style_all(bar); /*To have a clean start*/
lv_obj_add_style(bar, &style_bg, 0);
lv_obj_add_style(bar, &style_indic, LV_PART_INDICATOR);
lv_obj_set_size(bar, 200, 20);
lv_obj_center(bar);
lv_bar_set_value(bar, 100, LV_ANIM_ON);
}
#endif

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managed_components/lvgl__lvgl/examples/widgets/bar/lv_example_bar_3.c Normal file
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#include "../../lv_examples.h"
#if LV_USE_BAR && LV_BUILD_EXAMPLES
static void set_temp(void * bar, int32_t temp)
{
lv_bar_set_value((lv_obj_t *)bar, temp, LV_ANIM_ON);
}
/**
* A temperature meter example
*/
void lv_example_bar_3(void)
{
static lv_style_t style_indic;
lv_style_init(&style_indic);
lv_style_set_bg_opa(&style_indic, LV_OPA_COVER);
lv_style_set_bg_color(&style_indic, lv_palette_main(LV_PALETTE_RED));
lv_style_set_bg_grad_color(&style_indic, lv_palette_main(LV_PALETTE_BLUE));
lv_style_set_bg_grad_dir(&style_indic, LV_GRAD_DIR_VER);
lv_obj_t * bar = lv_bar_create(lv_screen_active());
lv_obj_add_style(bar, &style_indic, LV_PART_INDICATOR);
lv_obj_set_size(bar, 20, 200);
lv_obj_center(bar);
lv_bar_set_range(bar, -20, 40);
lv_anim_t a;
lv_anim_init(&a);
lv_anim_set_exec_cb(&a, set_temp);
lv_anim_set_duration(&a, 3000);
lv_anim_set_reverse_duration(&a, 3000);
lv_anim_set_var(&a, bar);
lv_anim_set_values(&a, -20, 40);
lv_anim_set_repeat_count(&a, LV_ANIM_REPEAT_INFINITE);
lv_anim_start(&a);
}
#endif

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managed_components/lvgl__lvgl/examples/widgets/bar/lv_example_bar_4.c Normal file
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#include "../../lv_examples.h"
#if LV_USE_BAR && LV_BUILD_EXAMPLES
/**
* Bar with stripe pattern and ranged value
*/
void lv_example_bar_4(void)
{
LV_IMAGE_DECLARE(img_skew_strip);
static lv_style_t style_indic;
lv_style_init(&style_indic);
lv_style_set_bg_image_src(&style_indic, &img_skew_strip);
lv_style_set_bg_image_tiled(&style_indic, true);
lv_style_set_bg_image_opa(&style_indic, LV_OPA_30);
lv_obj_t * bar = lv_bar_create(lv_screen_active());
lv_obj_add_style(bar, &style_indic, LV_PART_INDICATOR);
lv_obj_set_size(bar, 260, 20);
lv_obj_center(bar);
lv_bar_set_mode(bar, LV_BAR_MODE_RANGE);
lv_bar_set_value(bar, 90, LV_ANIM_OFF);
lv_bar_set_start_value(bar, 20, LV_ANIM_OFF);
}
#endif

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managed_components/lvgl__lvgl/examples/widgets/bar/lv_example_bar_5.c Normal file
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#include "../../lv_examples.h"
#if LV_USE_BAR && LV_BUILD_EXAMPLES
/**
* Bar with LTR and RTL base direction
*/
void lv_example_bar_5(void)
{
lv_obj_t * label;
lv_obj_t * bar_ltr = lv_bar_create(lv_screen_active());
lv_obj_set_size(bar_ltr, 200, 20);
lv_bar_set_value(bar_ltr, 70, LV_ANIM_OFF);
lv_obj_align(bar_ltr, LV_ALIGN_CENTER, 0, -30);
label = lv_label_create(lv_screen_active());
lv_label_set_text(label, "Left to Right base direction");
lv_obj_align_to(label, bar_ltr, LV_ALIGN_OUT_TOP_MID, 0, -5);
lv_obj_t * bar_rtl = lv_bar_create(lv_screen_active());
lv_obj_set_style_base_dir(bar_rtl, LV_BASE_DIR_RTL, 0);
lv_obj_set_size(bar_rtl, 200, 20);
lv_bar_set_value(bar_rtl, 70, LV_ANIM_OFF);
lv_obj_align(bar_rtl, LV_ALIGN_CENTER, 0, 30);
label = lv_label_create(lv_screen_active());
lv_label_set_text(label, "Right to Left base direction");
lv_obj_align_to(label, bar_rtl, LV_ALIGN_OUT_TOP_MID, 0, -5);
}
#endif

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#include "../../lv_examples.h"
#if LV_USE_BAR && LV_BUILD_EXAMPLES
#define MAX_VALUE 100
#define MIN_VALUE 0
static void set_value(void * bar, int32_t v)
{
lv_bar_set_value((lv_obj_t *)bar, v, LV_ANIM_OFF);
}
static void event_cb(lv_event_t * e)
{
lv_obj_t * obj = lv_event_get_target_obj(e);
lv_draw_label_dsc_t label_dsc;
lv_draw_label_dsc_init(&label_dsc);
label_dsc.font = LV_FONT_DEFAULT;
char buf[8];
lv_snprintf(buf, sizeof(buf), "%d", (int)lv_bar_get_value(obj));
lv_point_t txt_size;
lv_text_get_size(&txt_size, buf, label_dsc.font, label_dsc.letter_space, label_dsc.line_space, LV_COORD_MAX,
label_dsc.flag);
lv_area_t txt_area;
txt_area.x1 = 0;
txt_area.x2 = txt_size.x - 1;
txt_area.y1 = 0;
txt_area.y2 = txt_size.y - 1;
lv_area_t indic_area;
lv_obj_get_coords(obj, &indic_area);
lv_area_set_width(&indic_area, lv_area_get_width(&indic_area) * lv_bar_get_value(obj) / MAX_VALUE);
/*If the indicator is long enough put the text inside on the right*/
if(lv_area_get_width(&indic_area) > txt_size.x + 20) {
lv_area_align(&indic_area, &txt_area, LV_ALIGN_RIGHT_MID, -10, 0);
label_dsc.color = lv_color_white();
}
/*If the indicator is still short put the text out of it on the right*/
else {
lv_area_align(&indic_area, &txt_area, LV_ALIGN_OUT_RIGHT_MID, 10, 0);
label_dsc.color = lv_color_black();
}
label_dsc.text = buf;
label_dsc.text_local = true;
lv_layer_t * layer = lv_event_get_layer(e);
lv_draw_label(layer, &label_dsc, &txt_area);
}
/**
* Custom drawer on the bar to display the current value
*/
void lv_example_bar_6(void)
{
lv_obj_t * bar = lv_bar_create(lv_screen_active());
lv_bar_set_range(bar, MIN_VALUE, MAX_VALUE);
lv_obj_set_size(bar, 200, 20);
lv_obj_center(bar);
lv_obj_add_event_cb(bar, event_cb, LV_EVENT_DRAW_MAIN_END, NULL);
lv_anim_t a;
lv_anim_init(&a);
lv_anim_set_var(&a, bar);
lv_anim_set_values(&a, 0, 100);
lv_anim_set_exec_cb(&a, set_value);
lv_anim_set_duration(&a, 4000);
lv_anim_set_reverse_duration(&a, 4000);
lv_anim_set_repeat_count(&a, LV_ANIM_REPEAT_INFINITE);
lv_anim_start(&a);
}
#endif

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managed_components/lvgl__lvgl/examples/widgets/bar/lv_example_bar_7.c Normal file
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#include "../../lv_examples.h"
#if LV_USE_BAR && LV_BUILD_EXAMPLES
/**
* Bar with opposite direction
*/
void lv_example_bar_7(void)
{
lv_obj_t * bar_tob = lv_bar_create(lv_screen_active());
lv_obj_set_size(bar_tob, 20, 180);
lv_bar_set_range(bar_tob, 100, 0);
lv_bar_set_value(bar_tob, 70, LV_ANIM_OFF);
lv_obj_align(bar_tob, LV_ALIGN_CENTER, 0, 10);
lv_obj_t * label = lv_label_create(lv_screen_active());
lv_label_set_text(label, "From top to bottom");
lv_obj_align_to(label, bar_tob, LV_ALIGN_OUT_TOP_MID, 0, -5);
}
#endif

20
managed_components/lvgl__lvgl/examples/widgets/button/index.rst Normal file
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Simple Buttons
--------------
.. lv_example:: widgets/button/lv_example_button_1
:language: c
Styling buttons
---------------
.. lv_example:: widgets/button/lv_example_button_2
:language: c
Gummy button
------------
.. lv_example:: widgets/button/lv_example_button_3
:language: c

40
managed_components/lvgl__lvgl/examples/widgets/button/lv_example_button_1.c Normal file
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#include "../../lv_examples.h"
#if LV_USE_BUTTON && LV_BUILD_EXAMPLES
static void event_handler(lv_event_t * e)
{
lv_event_code_t code = lv_event_get_code(e);
if(code == LV_EVENT_CLICKED) {
LV_LOG_USER("Clicked");
}
else if(code == LV_EVENT_VALUE_CHANGED) {
LV_LOG_USER("Toggled");
}
}
void lv_example_button_1(void)
{
lv_obj_t * label;
lv_obj_t * btn1 = lv_button_create(lv_screen_active());
lv_obj_add_event_cb(btn1, event_handler, LV_EVENT_ALL, NULL);
lv_obj_align(btn1, LV_ALIGN_CENTER, 0, -40);
lv_obj_remove_flag(btn1, LV_OBJ_FLAG_PRESS_LOCK);
label = lv_label_create(btn1);
lv_label_set_text(label, "Button");
lv_obj_center(label);
lv_obj_t * btn2 = lv_button_create(lv_screen_active());
lv_obj_add_event_cb(btn2, event_handler, LV_EVENT_ALL, NULL);
lv_obj_align(btn2, LV_ALIGN_CENTER, 0, 40);
lv_obj_add_flag(btn2, LV_OBJ_FLAG_CHECKABLE);
lv_obj_set_height(btn2, LV_SIZE_CONTENT);
label = lv_label_create(btn2);
lv_label_set_text(label, "Toggle");
lv_obj_center(label);
}
#endif

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#include "../../lv_examples.h"
#if LV_USE_BUTTON && LV_BUILD_EXAMPLES
/**
* Style a button from scratch
*/
void lv_example_button_2(void)
{
/*Init the style for the default state*/
static lv_style_t style;
lv_style_init(&style);
lv_style_set_radius(&style, 3);
lv_style_set_bg_opa(&style, LV_OPA_100);
lv_style_set_bg_color(&style, lv_palette_main(LV_PALETTE_BLUE));
lv_style_set_bg_grad_color(&style, lv_palette_darken(LV_PALETTE_BLUE, 2));
lv_style_set_bg_grad_dir(&style, LV_GRAD_DIR_VER);
lv_style_set_border_opa(&style, LV_OPA_40);
lv_style_set_border_width(&style, 2);
lv_style_set_border_color(&style, lv_palette_main(LV_PALETTE_GREY));
lv_style_set_shadow_width(&style, 8);
lv_style_set_shadow_color(&style, lv_palette_main(LV_PALETTE_GREY));
lv_style_set_shadow_offset_y(&style, 8);
lv_style_set_outline_opa(&style, LV_OPA_COVER);
lv_style_set_outline_color(&style, lv_palette_main(LV_PALETTE_BLUE));
lv_style_set_text_color(&style, lv_color_white());
lv_style_set_pad_all(&style, 10);
/*Init the pressed style*/
static lv_style_t style_pr;
lv_style_init(&style_pr);
/*Add a large outline when pressed*/
lv_style_set_outline_width(&style_pr, 30);
lv_style_set_outline_opa(&style_pr, LV_OPA_TRANSP);
lv_style_set_translate_y(&style_pr, 5);
lv_style_set_shadow_offset_y(&style_pr, 3);
lv_style_set_bg_color(&style_pr, lv_palette_darken(LV_PALETTE_BLUE, 2));
lv_style_set_bg_grad_color(&style_pr, lv_palette_darken(LV_PALETTE_BLUE, 4));
/*Add a transition to the outline*/
static lv_style_transition_dsc_t trans;
static lv_style_prop_t props[] = {LV_STYLE_OUTLINE_WIDTH, LV_STYLE_OUTLINE_OPA, 0};
lv_style_transition_dsc_init(&trans, props, lv_anim_path_linear, 300, 0, NULL);
lv_style_set_transition(&style_pr, &trans);
lv_obj_t * btn1 = lv_button_create(lv_screen_active());
lv_obj_remove_style_all(btn1); /*Remove the style coming from the theme*/
lv_obj_add_style(btn1, &style, 0);
lv_obj_add_style(btn1, &style_pr, LV_STATE_PRESSED);
lv_obj_set_size(btn1, LV_SIZE_CONTENT, LV_SIZE_CONTENT);
lv_obj_center(btn1);
lv_obj_t * label = lv_label_create(btn1);
lv_label_set_text(label, "Button");
lv_obj_center(label);
}
#endif

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managed_components/lvgl__lvgl/examples/widgets/button/lv_example_button_3.c Normal file
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#include "../../lv_examples.h"
#if LV_BUILD_EXAMPLES && LV_USE_BUTTON
/**
* Create a style transition on a button to act like a gum when clicked
*/
void lv_example_button_3(void)
{
/*Properties to transition*/
static lv_style_prop_t props[] = {
LV_STYLE_TRANSFORM_WIDTH, LV_STYLE_TRANSFORM_HEIGHT, LV_STYLE_TEXT_LETTER_SPACE, 0
};
/*Transition descriptor when going back to the default state.
*Add some delay to be sure the press transition is visible even if the press was very short*/
static lv_style_transition_dsc_t transition_dsc_def;
lv_style_transition_dsc_init(&transition_dsc_def, props, lv_anim_path_overshoot, 250, 100, NULL);
/*Transition descriptor when going to pressed state.
*No delay, go to presses state immediately*/
static lv_style_transition_dsc_t transition_dsc_pr;
lv_style_transition_dsc_init(&transition_dsc_pr, props, lv_anim_path_ease_in_out, 250, 0, NULL);
/*Add only the new transition to he default state*/
static lv_style_t style_def;
lv_style_init(&style_def);
lv_style_set_transition(&style_def, &transition_dsc_def);
/*Add the transition and some transformation to the presses state.*/
static lv_style_t style_pr;
lv_style_init(&style_pr);
lv_style_set_transform_width(&style_pr, 10);
lv_style_set_transform_height(&style_pr, -10);
lv_style_set_text_letter_space(&style_pr, 10);
lv_style_set_transition(&style_pr, &transition_dsc_pr);
lv_obj_t * btn1 = lv_button_create(lv_screen_active());
lv_obj_align(btn1, LV_ALIGN_CENTER, 0, -80);
lv_obj_add_style(btn1, &style_pr, LV_STATE_PRESSED);
lv_obj_add_style(btn1, &style_def, 0);
lv_obj_t * label = lv_label_create(btn1);
lv_label_set_text(label, "Gum");
}
#endif

24
managed_components/lvgl__lvgl/examples/widgets/buttonmatrix/index.rst Normal file
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.. example_heading: Button Matrix
Simple Button matrix
--------------------
.. lv_example:: widgets/buttonmatrix/lv_example_buttonmatrix_1
:language: c
Custom buttons
--------------
.. lv_example:: widgets/buttonmatrix/lv_example_buttonmatrix_2
:language: c
Pagination
----------
.. lv_example:: widgets/buttonmatrix/lv_example_buttonmatrix_3
:language: c

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managed_components/lvgl__lvgl/examples/widgets/buttonmatrix/lv_example_buttonmatrix_1.c Normal file
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#include "../../lv_examples.h"
#if LV_USE_BUTTONMATRIX && LV_BUILD_EXAMPLES
static void event_handler(lv_event_t * e)
{
lv_event_code_t code = lv_event_get_code(e);
lv_obj_t * obj = lv_event_get_target_obj(e);
if(code == LV_EVENT_VALUE_CHANGED) {
uint32_t id = lv_buttonmatrix_get_selected_button(obj);
const char * txt = lv_buttonmatrix_get_button_text(obj, id);
LV_UNUSED(txt);
LV_LOG_USER("%s was pressed\n", txt);
}
}
static const char * btnm_map[] = {"1", "2", "3", "4", "5", "\n",
"6", "7", "8", "9", "0", "\n",
"Action1", "Action2", ""
};
void lv_example_buttonmatrix_1(void)
{
lv_obj_t * btnm1 = lv_buttonmatrix_create(lv_screen_active());
lv_buttonmatrix_set_map(btnm1, btnm_map);
lv_buttonmatrix_set_button_width(btnm1, 10, 2); /*Make "Action1" twice as wide as "Action2"*/
lv_buttonmatrix_set_button_ctrl(btnm1, 10, LV_BUTTONMATRIX_CTRL_CHECKABLE);
lv_buttonmatrix_set_button_ctrl(btnm1, 11, LV_BUTTONMATRIX_CTRL_CHECKED);
lv_obj_align(btnm1, LV_ALIGN_CENTER, 0, 0);
lv_obj_add_event_cb(btnm1, event_handler, LV_EVENT_ALL, NULL);
}
#endif

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#include "../../lv_examples.h"
#if LV_USE_BUTTONMATRIX && LV_BUILD_EXAMPLES
static void event_cb(lv_event_t * e)
{
lv_obj_t * obj = lv_event_get_target_obj(e);
lv_draw_task_t * draw_task = lv_event_get_draw_task(e);
lv_draw_dsc_base_t * base_dsc = (lv_draw_dsc_base_t *)lv_draw_task_get_draw_dsc(draw_task);
/*When the button matrix draws the buttons...*/
if(base_dsc->part == LV_PART_ITEMS) {
bool pressed = false;
if(lv_buttonmatrix_get_selected_button(obj) == base_dsc->id1 && lv_obj_has_state(obj, LV_STATE_PRESSED)) {
pressed = true;
}
/*Change the draw descriptor of the 2nd button*/
if(base_dsc->id1 == 1) {
lv_draw_fill_dsc_t * fill_draw_dsc = lv_draw_task_get_fill_dsc(draw_task);
if(fill_draw_dsc) {
fill_draw_dsc->radius = 0;
if(pressed) fill_draw_dsc->color = lv_palette_darken(LV_PALETTE_BLUE, 3);
else fill_draw_dsc->color = lv_palette_main(LV_PALETTE_BLUE);
}
lv_draw_box_shadow_dsc_t * box_shadow_draw_dsc = lv_draw_task_get_box_shadow_dsc(draw_task);
if(box_shadow_draw_dsc) {
box_shadow_draw_dsc->width = 6;
box_shadow_draw_dsc->ofs_x = 3;
box_shadow_draw_dsc->ofs_y = 3;
}
lv_draw_label_dsc_t * label_draw_dsc = lv_draw_task_get_label_dsc(draw_task);
if(label_draw_dsc) {
label_draw_dsc->color = lv_color_white();
}
}
/*Change the draw descriptor of the 3rd button*/
else if(base_dsc->id1 == 2) {
lv_draw_fill_dsc_t * fill_draw_dsc = lv_draw_task_get_fill_dsc(draw_task);
if(fill_draw_dsc) {
fill_draw_dsc->radius = LV_RADIUS_CIRCLE;
if(pressed) fill_draw_dsc->color = lv_palette_darken(LV_PALETTE_RED, 3);
else fill_draw_dsc->color = lv_palette_main(LV_PALETTE_RED);
}
lv_draw_box_shadow_dsc_t * box_shadow_draw_dsc = lv_draw_task_get_box_shadow_dsc(draw_task);
if(box_shadow_draw_dsc) {
box_shadow_draw_dsc->radius = LV_RADIUS_CIRCLE;
}
}
else if(base_dsc->id1 == 3) {
lv_draw_label_dsc_t * label_draw_dsc = lv_draw_task_get_label_dsc(draw_task);
if(label_draw_dsc) {
label_draw_dsc->opa = 0;
}
if(lv_draw_task_get_type(draw_task) == LV_DRAW_TASK_TYPE_FILL) {
LV_IMAGE_DECLARE(img_star);
lv_image_header_t header;
lv_result_t res = lv_image_decoder_get_info(&img_star, &header);
if(res != LV_RESULT_OK) return;
lv_area_t a;
a.x1 = 0;
a.x2 = header.w - 1;
a.y1 = 0;
a.y2 = header.h - 1;
lv_area_t draw_task_area;
lv_draw_task_get_area(draw_task, &draw_task_area);
lv_area_align(&draw_task_area, &a, LV_ALIGN_CENTER, 0, 0);
lv_draw_image_dsc_t img_draw_dsc;
lv_draw_image_dsc_init(&img_draw_dsc);
img_draw_dsc.src = &img_star;
img_draw_dsc.recolor = lv_color_black();
if(pressed) img_draw_dsc.recolor_opa = LV_OPA_30;
lv_draw_image(base_dsc->layer, &img_draw_dsc, &a);
}
}
}
}
/**
* Add custom drawer to the button matrix to customize buttons one by one
*/
void lv_example_buttonmatrix_2(void)
{
lv_obj_t * btnm = lv_buttonmatrix_create(lv_screen_active());
lv_obj_add_event_cb(btnm, event_cb, LV_EVENT_DRAW_TASK_ADDED, NULL);
lv_obj_add_flag(btnm, LV_OBJ_FLAG_SEND_DRAW_TASK_EVENTS);
lv_obj_center(btnm);
}
#endif

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#include "../../lv_examples.h"
#if LV_USE_BUTTONMATRIX && LV_BUILD_EXAMPLES
static void event_cb(lv_event_t * e)
{
lv_obj_t * obj = lv_event_get_target_obj(e);
uint32_t id = lv_buttonmatrix_get_selected_button(obj);
bool prev = id == 0;
bool next = id == 6;
if(prev || next) {
/*Find the checked button*/
uint32_t i;
for(i = 1; i < 7; i++) {
if(lv_buttonmatrix_has_button_ctrl(obj, i, LV_BUTTONMATRIX_CTRL_CHECKED)) break;
}
if(prev && i > 1) i--;
else if(next && i < 5) i++;
lv_buttonmatrix_set_button_ctrl(obj, i, LV_BUTTONMATRIX_CTRL_CHECKED);
}
}
/**
* Make a button group (pagination)
*/
void lv_example_buttonmatrix_3(void)
{
static lv_style_t style_bg;
lv_style_init(&style_bg);
lv_style_set_pad_all(&style_bg, 0);
lv_style_set_pad_gap(&style_bg, 0);
lv_style_set_clip_corner(&style_bg, true);
lv_style_set_radius(&style_bg, LV_RADIUS_CIRCLE);
lv_style_set_border_width(&style_bg, 0);
static lv_style_t style_btn;
lv_style_init(&style_btn);
lv_style_set_radius(&style_btn, 0);
lv_style_set_border_width(&style_btn, 1);
lv_style_set_border_opa(&style_btn, LV_OPA_50);
lv_style_set_border_color(&style_btn, lv_palette_main(LV_PALETTE_GREY));
lv_style_set_border_side(&style_btn, LV_BORDER_SIDE_INTERNAL);
lv_style_set_radius(&style_btn, 0);
static const char * map[] = {LV_SYMBOL_LEFT, "1", "2", "3", "4", "5", LV_SYMBOL_RIGHT, ""};
lv_obj_t * btnm = lv_buttonmatrix_create(lv_screen_active());
lv_buttonmatrix_set_map(btnm, map);
lv_obj_add_style(btnm, &style_bg, 0);
lv_obj_add_style(btnm, &style_btn, LV_PART_ITEMS);
lv_obj_add_event_cb(btnm, event_cb, LV_EVENT_VALUE_CHANGED, NULL);
lv_obj_set_size(btnm, 225, 35);
/*Allow selecting on one number at time*/
lv_buttonmatrix_set_button_ctrl_all(btnm, LV_BUTTONMATRIX_CTRL_CHECKABLE);
lv_buttonmatrix_clear_button_ctrl(btnm, 0, LV_BUTTONMATRIX_CTRL_CHECKABLE);
lv_buttonmatrix_clear_button_ctrl(btnm, 6, LV_BUTTONMATRIX_CTRL_CHECKABLE);
lv_buttonmatrix_set_one_checked(btnm, true);
lv_buttonmatrix_set_button_ctrl(btnm, 1, LV_BUTTONMATRIX_CTRL_CHECKED);
lv_obj_center(btnm);
}
#endif

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Calendar with header
--------------------
.. lv_example:: widgets/calendar/lv_example_calendar_1
:language: c
Chinese calendar
-------------------------------------
.. lv_example:: widgets/calendar/lv_example_calendar_2
:language: c

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#include "../../lv_examples.h"
#if LV_USE_CALENDAR && LV_BUILD_EXAMPLES
static void event_handler(lv_event_t * e)
{
lv_event_code_t code = lv_event_get_code(e);
lv_obj_t * obj = (lv_obj_t *)lv_event_get_current_target(e);
if(code == LV_EVENT_VALUE_CHANGED) {
lv_calendar_date_t date;
if(lv_calendar_get_pressed_date(obj, &date)) {
LV_LOG_USER("Clicked date: %02d.%02d.%d", date.day, date.month, date.year);
}
}
}
void lv_example_calendar_1(void)
{
lv_obj_t * calendar = lv_calendar_create(lv_screen_active());
lv_obj_set_size(calendar, 185, 230);
lv_obj_align(calendar, LV_ALIGN_CENTER, 0, 27);
lv_obj_add_event_cb(calendar, event_handler, LV_EVENT_ALL, NULL);
lv_calendar_set_today_date(calendar, 2021, 02, 23);
lv_calendar_set_month_shown(calendar, 2021, 02);
/*Highlight a few days*/
static lv_calendar_date_t highlighted_days[3]; /*Only its pointer will be saved so should be static*/
highlighted_days[0].year = 2021;
highlighted_days[0].month = 02;
highlighted_days[0].day = 6;
highlighted_days[1].year = 2021;
highlighted_days[1].month = 02;
highlighted_days[1].day = 11;
highlighted_days[2].year = 2022;
highlighted_days[2].month = 02;
highlighted_days[2].day = 22;
lv_calendar_set_highlighted_dates(calendar, highlighted_days, 3);
#if LV_USE_CALENDAR_HEADER_DROPDOWN
lv_calendar_add_header_dropdown(calendar);
#elif LV_USE_CALENDAR_HEADER_ARROW
lv_calendar_add_header_arrow(calendar);
#endif
}
#endif

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#include "../../lv_examples.h"
#if LV_USE_CALENDAR && LV_USE_CALENDAR_CHINESE && LV_BUILD_EXAMPLES
void lv_example_calendar_2(void)
{
lv_obj_t * calendar = lv_calendar_create(lv_screen_active());
lv_obj_set_size(calendar, 300, 300);
lv_obj_align(calendar, LV_ALIGN_TOP_MID, 0, 0);
lv_calendar_set_today_date(calendar, 2024, 03, 22);
lv_calendar_set_month_shown(calendar, 2024, 03);
#if LV_USE_CALENDAR_HEADER_DROPDOWN
lv_calendar_add_header_dropdown(calendar);
#elif LV_USE_CALENDAR_HEADER_ARROW
lv_calendar_add_header_arrow(calendar);
#endif
lv_calendar_set_chinese_mode(calendar, true);
lv_obj_set_style_text_font(calendar, &lv_font_source_han_sans_sc_14_cjk, LV_PART_MAIN);
}
#else
void lv_example_calendar_2(void)
{
lv_obj_t * label = lv_label_create(lv_screen_active());
lv_label_set_text(label, "chinese calendar is not enabled");
lv_obj_center(label);
}
#endif

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Drawing on the Canvas and rotate
--------------------------------
.. lv_example:: widgets/canvas/lv_example_canvas_1
:language: c
Transparent Canvas with chroma keying
-------------------------------------
.. lv_example:: widgets/canvas/lv_example_canvas_2
:language: c
Draw a rectangle to the canvas
------------------------------
.. lv_example:: widgets/canvas/lv_example_canvas_3
:language: c
Draw a label to the canvas
--------------------------
.. lv_example:: widgets/canvas/lv_example_canvas_4
:language: c
Draw an arc to the canvas
-------------------------
.. lv_example:: widgets/canvas/lv_example_canvas_5
:language: c
Draw an image to the canvas
---------------------------
.. lv_example:: widgets/canvas/lv_example_canvas_6
:language: c
Draw a line to the canvas
-------------------------
.. lv_example:: widgets/canvas/lv_example_canvas_7
:language: c
Draw a vector graphic to the canvas
-----------------------------------
.. lv_example:: widgets/canvas/lv_example_canvas_8
:language: c
Draw a triangle to the canvas
-----------------------------
.. lv_example:: widgets/canvas/lv_example_canvas_9
:language: c
Blur an area on the canvas
-----------------------------
.. lv_example:: widgets/canvas/lv_example_canvas_10
:language: c
Draw Fancy Letter Effects
-------------------------
.. lv_example:: widgets/canvas/lv_example_canvas_11
:language: c
Draw Fancy Letter Effects 2
---------------------------
.. lv_example:: widgets/canvas/lv_example_canvas_12
:language: c

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#include "../../lv_examples.h"
#if LV_USE_CANVAS && LV_BUILD_EXAMPLES
#define CANVAS_WIDTH 200
#define CANVAS_HEIGHT 150
void lv_example_canvas_1(void)
{
lv_draw_rect_dsc_t rect_dsc;
lv_draw_rect_dsc_init(&rect_dsc);
rect_dsc.radius = 10;
rect_dsc.bg_opa = LV_OPA_COVER;
rect_dsc.bg_grad.dir = LV_GRAD_DIR_VER;
rect_dsc.bg_grad.stops[0].color = lv_palette_main(LV_PALETTE_RED);
rect_dsc.bg_grad.stops[0].opa = LV_OPA_100;
rect_dsc.bg_grad.stops[1].color = lv_palette_main(LV_PALETTE_BLUE);
rect_dsc.bg_grad.stops[1].opa = LV_OPA_50;
rect_dsc.border_width = 2;
rect_dsc.border_opa = LV_OPA_90;
rect_dsc.border_color = lv_color_white();
rect_dsc.shadow_width = 5;
rect_dsc.shadow_offset_x = 5;
rect_dsc.shadow_offset_y = 5;
lv_draw_label_dsc_t label_dsc;
lv_draw_label_dsc_init(&label_dsc);
label_dsc.color = lv_palette_main(LV_PALETTE_ORANGE);
label_dsc.text = "Some text on text canvas";
/*Create a buffer for the canvas*/
LV_DRAW_BUF_DEFINE_STATIC(draw_buf_16bpp, CANVAS_WIDTH, CANVAS_HEIGHT, LV_COLOR_FORMAT_RGB565);
LV_DRAW_BUF_INIT_STATIC(draw_buf_16bpp);
lv_obj_t * canvas = lv_canvas_create(lv_screen_active());
lv_canvas_set_draw_buf(canvas, &draw_buf_16bpp);
lv_obj_center(canvas);
lv_canvas_fill_bg(canvas, lv_palette_lighten(LV_PALETTE_GREY, 3), LV_OPA_COVER);
lv_layer_t layer;
lv_canvas_init_layer(canvas, &layer);
lv_area_t coords_rect = {30, 20, 100, 70};
lv_draw_rect(&layer, &rect_dsc, &coords_rect);
lv_area_t coords_text = {40, 80, 100, 120};
lv_draw_label(&layer, &label_dsc, &coords_text);
lv_canvas_finish_layer(canvas, &layer);
/*Test the rotation. It requires another buffer where the original image is stored.
*So use previous canvas as image and rotate it to the new canvas*/
LV_DRAW_BUF_DEFINE_STATIC(draw_buf_32bpp, CANVAS_WIDTH, CANVAS_HEIGHT, LV_COLOR_FORMAT_ARGB8888);
LV_DRAW_BUF_INIT_STATIC(draw_buf_32bpp);
/*Create a canvas and initialize its palette*/
canvas = lv_canvas_create(lv_screen_active());
lv_canvas_set_draw_buf(canvas, &draw_buf_32bpp);
lv_canvas_fill_bg(canvas, lv_color_hex3(0xccc), LV_OPA_COVER);
lv_obj_center(canvas);
lv_canvas_fill_bg(canvas, lv_palette_lighten(LV_PALETTE_GREY, 1), LV_OPA_COVER);
lv_canvas_init_layer(canvas, &layer);
lv_image_dsc_t img;
lv_draw_buf_to_image(&draw_buf_16bpp, &img);
lv_draw_image_dsc_t img_dsc;
lv_draw_image_dsc_init(&img_dsc);
img_dsc.rotation = 120;
img_dsc.src = &img;
img_dsc.pivot.x = CANVAS_WIDTH / 2;
img_dsc.pivot.y = CANVAS_HEIGHT / 2;
lv_area_t coords_img = {0, 0, CANVAS_WIDTH - 1, CANVAS_HEIGHT - 1};
lv_draw_image(&layer, &img_dsc, &coords_img);
lv_canvas_finish_layer(canvas, &layer);
}
#endif

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#include "../../lv_examples.h"
#if LV_USE_CANVAS && LV_FONT_MONTSERRAT_18 && LV_BUILD_EXAMPLES
#define CANVAS_WIDTH 100
#define CANVAS_HEIGHT 100
/**
*Blur an area on the canvas
*/
void lv_example_canvas_10(void)
{
/*Create a buffer for the canvas*/
LV_DRAW_BUF_DEFINE_STATIC(draw_buf, CANVAS_WIDTH, CANVAS_HEIGHT, LV_COLOR_FORMAT_RGB565);
LV_DRAW_BUF_INIT_STATIC(draw_buf);
/*Create a canvas and initialize its palette*/
lv_obj_t * canvas = lv_canvas_create(lv_screen_active());
lv_canvas_set_draw_buf(canvas, &draw_buf);
lv_canvas_fill_bg(canvas, lv_color_hex3(0xccc), LV_OPA_COVER);
lv_obj_center(canvas);
lv_layer_t layer;
lv_canvas_init_layer(canvas, &layer);
/*A label in the background*/
lv_draw_label_dsc_t label_dsc;
lv_draw_label_dsc_init(&label_dsc);
label_dsc.color = lv_palette_main(LV_PALETTE_RED);
label_dsc.font = &lv_font_montserrat_14;
label_dsc.decor = LV_TEXT_DECOR_UNDERLINE;
label_dsc.align = LV_TEXT_ALIGN_CENTER;
label_dsc.text = "Some parts of\nthis canvas is blurred";
lv_area_t label1_coords = {10, 10, 90, 90};
lv_draw_label(&layer, &label_dsc, &label1_coords);
/*Blur the middle of the canvas*/
lv_draw_blur_dsc_t blur_dsc;
lv_draw_blur_dsc_init(&blur_dsc);
blur_dsc.corner_radius = 10;
blur_dsc.blur_radius = 8;
lv_area_t fill_coords = {20, 30, 80, 70};
lv_draw_blur(&layer, &blur_dsc, &fill_coords);
/*Draw a semi-transparent rectangle on the blurred area*/
lv_draw_fill_dsc_t fill_dsc;
lv_draw_fill_dsc_init(&fill_dsc);
fill_dsc.color = lv_palette_lighten(LV_PALETTE_BLUE, 1);
fill_dsc.radius = 10;
fill_dsc.opa = LV_OPA_30;
lv_draw_fill(&layer, &fill_dsc, &fill_coords);
/*Add label on the blurred area*/
lv_draw_label_dsc_init(&label_dsc);
label_dsc.color = lv_color_black();
label_dsc.font = &lv_font_montserrat_14;
label_dsc.align = LV_TEXT_ALIGN_CENTER;
label_dsc.text = "Hello world";
lv_area_t label2_coords = {20, 35, 80, 60};
lv_draw_label(&layer, &label_dsc, &label2_coords);
lv_canvas_finish_layer(canvas, &layer);
}
#endif

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#include "../../lv_examples.h"
#if LV_USE_CANVAS && LV_BUILD_EXAMPLES
#define CANVAS_WIDTH 300
#define CANVAS_HEIGHT 200
static void timer_cb(lv_timer_t * timer)
{
static int32_t counter = 0;
const char * string = "lol~ I'm wavvvvvvving~>>>";
const int16_t string_len = lv_strlen(string);
lv_obj_t * canvas = (lv_obj_t *)lv_timer_get_user_data(timer);
lv_layer_t layer;
lv_canvas_init_layer(canvas, &layer);
lv_canvas_fill_bg(canvas, lv_color_white(), LV_OPA_COVER);
lv_draw_letter_dsc_t letter_dsc;
lv_draw_letter_dsc_init(&letter_dsc);
letter_dsc.color = lv_color_hex(0xff0000);
letter_dsc.font = lv_font_get_default();
{
#define CURVE2_X(t) (t * 2 + 10)
#define CURVE2_Y(t) (lv_trigo_sin((t) * 5) * 40 / 32767 + CANVAS_HEIGHT / 2)
int32_t pre_x = CURVE2_X(-1);
int32_t pre_y = CURVE2_Y(-1);
for(int16_t i = 0; i < string_len; i++) {
const int16_t angle = (int16_t)(i * 5);
const int32_t x = CURVE2_X(angle);
const int32_t y = CURVE2_Y(angle + counter / 2);
const lv_point_t point = { .x = x, .y = y };
letter_dsc.unicode = (uint32_t)string[i % string_len];
letter_dsc.rotation = lv_atan2(y - pre_y, x - pre_x) * 10;
letter_dsc.color = lv_color_hsv_to_rgb(i * 10, 100, 100);
lv_draw_letter(&layer, &letter_dsc, &point);
pre_x = x;
pre_y = y;
}
}
lv_canvas_finish_layer(canvas, &layer);
counter++;
}
void lv_example_canvas_11(void)
{
/*Create a buffer for the canvas*/
LV_DRAW_BUF_DEFINE_STATIC(draw_buf, CANVAS_WIDTH, CANVAS_HEIGHT, LV_COLOR_FORMAT_ARGB8888);
LV_DRAW_BUF_INIT_STATIC(draw_buf);
lv_obj_t * canvas = lv_canvas_create(lv_screen_active());
lv_obj_set_size(canvas, CANVAS_WIDTH, CANVAS_HEIGHT);
lv_obj_center(canvas);
lv_canvas_set_draw_buf(canvas, &draw_buf);
lv_timer_create(timer_cb, 16, canvas);
}
#endif

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#include "../../lv_examples.h"
#if LV_USE_CANVAS && LV_BUILD_EXAMPLES
#define CANVAS_WIDTH 300
#define CANVAS_HEIGHT 200
static void timer_cb(lv_timer_t * timer)
{
static int32_t counter = 0;
const char * string = "windstorrrrrrrrrrrrrrrrm~>>>";
const int16_t string_len = lv_strlen(string);
lv_obj_t * canvas = (lv_obj_t *) lv_timer_get_user_data(timer);
lv_layer_t layer;
lv_canvas_init_layer(canvas, &layer);
lv_canvas_fill_bg(canvas, lv_color_white(), LV_OPA_COVER);
lv_draw_letter_dsc_t letter_dsc;
lv_draw_letter_dsc_init(&letter_dsc);
letter_dsc.color = lv_color_hex(0xff0000);
letter_dsc.font = lv_font_get_default();
{
#define CURVE2_X(t) ((t) * 2 + lv_trigo_cos((t) * 5) * 40 / 32767 - 10)
#define CURVE2_Y(t, T) ((t) * lv_trigo_sin(((t) + (T)) * 5) * 40 / 32767 / 80 + CANVAS_HEIGHT / 2)
int32_t pre_x = CURVE2_X(-1);
int32_t pre_y = CURVE2_Y(-1, 0);
for(int16_t i = 0; i < string_len; i++) {
const int32_t angle = i * 5;
const int32_t x = CURVE2_X(angle);
const int32_t y = CURVE2_Y(angle + 30, counter / 2);
letter_dsc.unicode = (uint32_t)string[i % string_len];
letter_dsc.rotation = lv_atan2(y - pre_y, x - pre_x) * 10;
letter_dsc.color = lv_color_hsv_to_rgb(i * 10, 100, 100);
lv_point_t p = (lv_point_t) {
.x = x, .y = y
};
lv_draw_letter(&layer, &letter_dsc, &p);
pre_x = x;
pre_y = y;
}
}
lv_canvas_finish_layer(canvas, &layer);
counter++;
}
void lv_example_canvas_12(void)
{
/*Create a buffer for the canvas*/
LV_DRAW_BUF_DEFINE_STATIC(draw_buf, CANVAS_WIDTH, CANVAS_HEIGHT, LV_COLOR_FORMAT_ARGB8888);
LV_DRAW_BUF_INIT_STATIC(draw_buf);
lv_obj_t * canvas = lv_canvas_create(lv_screen_active());
lv_obj_set_size(canvas, CANVAS_WIDTH, CANVAS_HEIGHT);
lv_obj_center(canvas);
lv_canvas_set_draw_buf(canvas, &draw_buf);
lv_timer_create(timer_cb, 16, canvas);
}
#endif

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#include "../../lv_examples.h"
#if LV_USE_CANVAS && LV_BUILD_EXAMPLES
#define CANVAS_WIDTH 80
#define CANVAS_HEIGHT 40
/**
* Create a transparent canvas with transparency
*/
void lv_example_canvas_2(void)
{
lv_obj_set_style_bg_color(lv_screen_active(), lv_palette_lighten(LV_PALETTE_RED, 5), 0);
/*Create a buffer for the canvas*/
LV_DRAW_BUF_DEFINE_STATIC(draw_buf, CANVAS_WIDTH, CANVAS_HEIGHT, LV_COLOR_FORMAT_ARGB8888);
LV_DRAW_BUF_INIT_STATIC(draw_buf);
/*Create a canvas and initialize its palette*/
lv_obj_t * canvas = lv_canvas_create(lv_screen_active());
lv_canvas_set_draw_buf(canvas, &draw_buf);
lv_obj_center(canvas);
/*Red background (There is no dedicated alpha channel in indexed images so LV_OPA_COVER is ignored)*/
lv_canvas_fill_bg(canvas, lv_palette_main(LV_PALETTE_BLUE), LV_OPA_COVER);
/*Create hole on the canvas*/
int32_t x;
int32_t y;
for(y = 10; y < 20; y++) {
for(x = 5; x < 75; x++) {
lv_canvas_set_px(canvas, x, y, lv_palette_main(LV_PALETTE_BLUE), LV_OPA_50);
}
}
for(y = 20; y < 30; y++) {
for(x = 5; x < 75; x++) {
lv_canvas_set_px(canvas, x, y, lv_palette_main(LV_PALETTE_BLUE), LV_OPA_20);
}
}
for(y = 30; y < 40; y++) {
for(x = 5; x < 75; x++) {
lv_canvas_set_px(canvas, x, y, lv_palette_main(LV_PALETTE_BLUE), LV_OPA_0);
}
}
}
#endif

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#include "../../lv_examples.h"
#if LV_USE_CANVAS && LV_BUILD_EXAMPLES
#define CANVAS_WIDTH 50
#define CANVAS_HEIGHT 50
/**
* Draw a rectangle to the canvas
*/
void lv_example_canvas_3(void)
{
/*Create a buffer for the canvas*/
LV_DRAW_BUF_DEFINE_STATIC(draw_buf, CANVAS_WIDTH, CANVAS_HEIGHT, LV_COLOR_FORMAT_ARGB8888);
LV_DRAW_BUF_INIT_STATIC(draw_buf);
/*Create a canvas and initialize its palette*/
lv_obj_t * canvas = lv_canvas_create(lv_screen_active());
lv_canvas_set_draw_buf(canvas, &draw_buf);
lv_canvas_fill_bg(canvas, lv_color_hex3(0xccc), LV_OPA_COVER);
lv_obj_center(canvas);
lv_layer_t layer;
lv_canvas_init_layer(canvas, &layer);
lv_draw_rect_dsc_t dsc;
lv_draw_rect_dsc_init(&dsc);
dsc.bg_color = lv_palette_main(LV_PALETTE_RED);
dsc.border_color = lv_palette_main(LV_PALETTE_BLUE);
dsc.border_width = 3;
dsc.outline_color = lv_palette_main(LV_PALETTE_GREEN);
dsc.outline_width = 2;
dsc.outline_pad = 2;
dsc.outline_opa = LV_OPA_50;
dsc.radius = 5;
dsc.border_width = 3;
lv_area_t coords = {10, 10, 40, 30};
lv_draw_rect(&layer, &dsc, &coords);
lv_canvas_finish_layer(canvas, &layer);
}
#endif

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#include "../../lv_examples.h"
#if LV_USE_CANVAS && LV_FONT_MONTSERRAT_18 && LV_BUILD_EXAMPLES
#define CANVAS_WIDTH 50
#define CANVAS_HEIGHT 50
/**
* Draw a text to the canvas
*/
void lv_example_canvas_4(void)
{
/*Create a buffer for the canvas*/
LV_DRAW_BUF_DEFINE_STATIC(draw_buf, CANVAS_WIDTH, CANVAS_HEIGHT, LV_COLOR_FORMAT_ARGB8888);
LV_DRAW_BUF_INIT_STATIC(draw_buf);
/*Create a canvas and initialize its palette*/
lv_obj_t * canvas = lv_canvas_create(lv_screen_active());
lv_canvas_set_draw_buf(canvas, &draw_buf);
lv_canvas_fill_bg(canvas, lv_color_hex3(0xccc), LV_OPA_COVER);
lv_obj_center(canvas);
lv_layer_t layer;
lv_canvas_init_layer(canvas, &layer);
lv_draw_label_dsc_t dsc;
lv_draw_label_dsc_init(&dsc);
dsc.color = lv_palette_main(LV_PALETTE_RED);
dsc.font = &lv_font_montserrat_18;
dsc.decor = LV_TEXT_DECOR_UNDERLINE;
dsc.text = "Hello";
lv_area_t coords = {10, 10, 30, 60};
lv_draw_label(&layer, &dsc, &coords);
lv_canvas_finish_layer(canvas, &layer);
}
#endif

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#include "../../lv_examples.h"
#if LV_USE_CANVAS && LV_BUILD_EXAMPLES
#define CANVAS_WIDTH 50
#define CANVAS_HEIGHT 50
/**
* Draw an arc to the canvas
*/
void lv_example_canvas_5(void)
{
/*Create a buffer for the canvas*/
LV_DRAW_BUF_DEFINE_STATIC(draw_buf, CANVAS_WIDTH, CANVAS_HEIGHT, LV_COLOR_FORMAT_ARGB8888);
LV_DRAW_BUF_INIT_STATIC(draw_buf);
/*Create a canvas and initialize its palette*/
lv_obj_t * canvas = lv_canvas_create(lv_screen_active());
lv_canvas_set_draw_buf(canvas, &draw_buf);
lv_canvas_fill_bg(canvas, lv_color_hex3(0xccc), LV_OPA_COVER);
lv_obj_center(canvas);
lv_layer_t layer;
lv_canvas_init_layer(canvas, &layer);
lv_draw_arc_dsc_t dsc;
lv_draw_arc_dsc_init(&dsc);
dsc.color = lv_palette_main(LV_PALETTE_RED);
dsc.center.x = 25;
dsc.center.y = 25;
dsc.width = 10;
dsc.radius = 15;
dsc.start_angle = 0;
dsc.end_angle = 220;
lv_draw_arc(&layer, &dsc);
lv_canvas_finish_layer(canvas, &layer);
}
#endif

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#include "../../lv_examples.h"
#if LV_USE_CANVAS && LV_BUILD_EXAMPLES
#define CANVAS_WIDTH 50
#define CANVAS_HEIGHT 50
/**
* Draw an image to the canvas
*/
void lv_example_canvas_6(void)
{
/*Create a buffer for the canvas*/
static uint8_t cbuf[LV_CANVAS_BUF_SIZE(CANVAS_WIDTH, CANVAS_HEIGHT, 32, LV_DRAW_BUF_STRIDE_ALIGN)];
/*Create a canvas and initialize its palette*/
lv_obj_t * canvas = lv_canvas_create(lv_screen_active());
lv_canvas_set_buffer(canvas, cbuf, CANVAS_WIDTH, CANVAS_HEIGHT, LV_COLOR_FORMAT_ARGB8888);
lv_canvas_fill_bg(canvas, lv_color_hex3(0xccc), LV_OPA_COVER);
lv_obj_center(canvas);
lv_layer_t layer;
lv_canvas_init_layer(canvas, &layer);
LV_IMAGE_DECLARE(img_star);
lv_draw_image_dsc_t dsc;
lv_draw_image_dsc_init(&dsc);
dsc.src = &img_star;
lv_area_t coords = {10, 10, 10 + img_star.header.w - 1, 10 + img_star.header.h - 1};
lv_draw_image(&layer, &dsc, &coords);
lv_canvas_finish_layer(canvas, &layer);
}
#endif

40
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#include "../../lv_examples.h"
#if LV_USE_CANVAS&& LV_BUILD_EXAMPLES
#define CANVAS_WIDTH 50
#define CANVAS_HEIGHT 50
/**
* Draw a line to the canvas
*/
void lv_example_canvas_7(void)
{
/*Create a buffer for the canvas*/
LV_DRAW_BUF_DEFINE_STATIC(draw_buf, CANVAS_WIDTH, CANVAS_HEIGHT, LV_COLOR_FORMAT_ARGB8888);
LV_DRAW_BUF_INIT_STATIC(draw_buf);
/*Create a canvas and initialize its palette*/
lv_obj_t * canvas = lv_canvas_create(lv_screen_active());
lv_canvas_set_draw_buf(canvas, &draw_buf);
lv_canvas_fill_bg(canvas, lv_color_hex3(0xccc), LV_OPA_COVER);
lv_obj_center(canvas);
lv_layer_t layer;
lv_canvas_init_layer(canvas, &layer);
lv_draw_line_dsc_t dsc;
lv_draw_line_dsc_init(&dsc);
dsc.color = lv_palette_main(LV_PALETTE_RED);
dsc.width = 4;
dsc.round_end = 1;
dsc.round_start = 1;
dsc.p1.x = 15;
dsc.p1.y = 15;
dsc.p2.x = 35;
dsc.p2.y = 10;
lv_draw_line(&layer, &dsc);
lv_canvas_finish_layer(canvas, &layer);
}
#endif

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#include "../../lv_examples.h"
#if LV_USE_CANVAS && LV_BUILD_EXAMPLES
#if LV_USE_VECTOR_GRAPHIC
#define CANVAS_WIDTH 150
#define CANVAS_HEIGHT 150
/**
* Draw a path to the canvas
*/
void lv_example_canvas_8(void)
{
/*Create a buffer for the canvas*/
LV_DRAW_BUF_DEFINE_STATIC(draw_buf, CANVAS_WIDTH, CANVAS_HEIGHT, LV_COLOR_FORMAT_ARGB8888);
LV_DRAW_BUF_INIT_STATIC(draw_buf);
/*Create a canvas and initialize its palette*/
lv_obj_t * canvas = lv_canvas_create(lv_screen_active());
lv_canvas_set_draw_buf(canvas, &draw_buf);
lv_canvas_fill_bg(canvas, lv_color_hex3(0xccc), LV_OPA_COVER);
lv_obj_center(canvas);
lv_layer_t layer;
lv_canvas_init_layer(canvas, &layer);
lv_draw_vector_dsc_t * dsc = lv_draw_vector_dsc_create(&layer);
lv_vector_path_t * path = lv_vector_path_create(LV_VECTOR_PATH_QUALITY_MEDIUM);
lv_fpoint_t pts[] = {{10, 10}, {130, 130}, {10, 130}};
lv_vector_path_move_to(path, &pts[0]);
lv_vector_path_line_to(path, &pts[1]);
lv_vector_path_line_to(path, &pts[2]);
lv_vector_path_close(path);
lv_draw_vector_dsc_set_fill_color(dsc, lv_color_make(0x00, 0x80, 0xff));
lv_draw_vector_dsc_add_path(dsc, path);
lv_draw_vector(dsc);
lv_vector_path_delete(path);
lv_draw_vector_dsc_delete(dsc);
lv_canvas_finish_layer(canvas, &layer);
}
#else
void lv_example_canvas_8(void)
{
/*fallback for online examples*/
lv_obj_t * label = lv_label_create(lv_screen_active());
lv_label_set_text(label, "Vector graphics is not enabled");
lv_obj_center(label);
}
#endif /*LV_USE_VECTOR_GRAPHIC*/
#endif

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#include "../../lv_examples.h"
#if LV_USE_CANVAS && LV_BUILD_EXAMPLES
#define CANVAS_WIDTH 150
#define CANVAS_HEIGHT 150
/**
* Draw a triangle to the canvas
*/
void lv_example_canvas_9(void)
{
/*Create a buffer for the canvas*/
LV_DRAW_BUF_DEFINE_STATIC(draw_buf, CANVAS_WIDTH, CANVAS_HEIGHT, LV_COLOR_FORMAT_ARGB8888);
LV_DRAW_BUF_INIT_STATIC(draw_buf);
/*Create a canvas and initialize its palette*/
lv_obj_t * canvas = lv_canvas_create(lv_screen_active());
lv_canvas_set_draw_buf(canvas, &draw_buf);
lv_canvas_fill_bg(canvas, lv_color_hex3(0xccc), LV_OPA_COVER);
lv_obj_center(canvas);
lv_layer_t layer;
lv_canvas_init_layer(canvas, &layer);
lv_draw_triangle_dsc_t tri_dsc;
lv_draw_triangle_dsc_init(&tri_dsc);
tri_dsc.p[0].x = 10;
tri_dsc.p[0].y = 10;
tri_dsc.p[1].x = 100;
tri_dsc.p[1].y = 30;
tri_dsc.p[2].x = 50;
tri_dsc.p[2].y = 100;
tri_dsc.grad.stops_count = 2;
tri_dsc.grad.dir = LV_GRAD_DIR_VER;
tri_dsc.grad.stops[0].color = lv_color_hex(0xff0000);
tri_dsc.grad.stops[0].frac = 64; /*Start at 25%*/
tri_dsc.grad.stops[0].opa = LV_OPA_COVER;
tri_dsc.grad.stops[1].color = lv_color_hex(0x0000ff);
tri_dsc.grad.stops[1].opa = LV_OPA_TRANSP;
tri_dsc.grad.stops[1].frac = 3 * 64; /*End at 75%*/
tri_dsc.opa = 128; /*Set the overall opacity to 50%*/
lv_draw_triangle(&layer, &tri_dsc);
lv_canvas_finish_layer(canvas, &layer);
}
#endif

49
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Line Chart
----------
.. lv_example:: widgets/chart/lv_example_chart_1
:language: c
Axis ticks and labels with scrolling
------------------------------------------------
.. lv_example:: widgets/chart/lv_example_chart_2
:language: c
Show the value of the pressed points
------------------------------------
.. lv_example:: widgets/chart/lv_example_chart_3
:language: c
Recolor bars based on their value
------------------------------------
.. lv_example:: widgets/chart/lv_example_chart_4
:language: c
Faded area line chart with custom division lines
---------------------------------------------------
.. lv_example:: widgets/chart/lv_example_chart_5
:language: c
Show cursor on the clicked point
--------------------------------
.. lv_example:: widgets/chart/lv_example_chart_6
:language: c
Scatter chart
-------------
.. lv_example:: widgets/chart/lv_example_chart_7
:language: c
Circular line chart with gap
----------------------------
.. lv_example:: widgets/chart/lv_example_chart_8
:language: c

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#include "../../lv_examples.h"
#if LV_USE_CHART && LV_BUILD_EXAMPLES
/**
* A very basic line chart
*/
void lv_example_chart_1(void)
{
/*Create a chart*/
lv_obj_t * chart;
chart = lv_chart_create(lv_screen_active());
lv_obj_set_size(chart, 200, 150);
lv_obj_center(chart);
lv_chart_set_type(chart, LV_CHART_TYPE_LINE); /*Show lines and points too*/
/*Add two data series*/
lv_chart_series_t * ser1 = lv_chart_add_series(chart, lv_palette_main(LV_PALETTE_GREEN), LV_CHART_AXIS_PRIMARY_Y);
lv_chart_series_t * ser2 = lv_chart_add_series(chart, lv_palette_main(LV_PALETTE_RED), LV_CHART_AXIS_SECONDARY_Y);
int32_t * ser2_y_points = lv_chart_get_series_y_array(chart, ser2);
uint32_t i;
for(i = 0; i < 10; i++) {
/*Set the next points on 'ser1'*/
lv_chart_set_next_value(chart, ser1, (int32_t)lv_rand(10, 50));
/*Directly set points on 'ser2'*/
ser2_y_points[i] = (int32_t)lv_rand(50, 90);
}
lv_obj_set_style_drop_shadow_opa(chart, 255, LV_PART_ITEMS);
lv_obj_set_style_drop_shadow_offset_x(chart, 0, LV_PART_ITEMS);
lv_obj_set_style_drop_shadow_radius(chart, 20, LV_PART_ITEMS);
/* Drop shadow color follows each series color automatically,
* so no manual override is needed. */
lv_chart_refresh(chart); /*Required after direct set*/
}
#endif

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#include "../../lv_examples.h"
#if LV_USE_CHART && LV_BUILD_EXAMPLES
/**
* Use lv_scale to add ticks to a scrollable chart
*/
void lv_example_chart_2(void)
{
/*Create a container*/
lv_obj_t * main_cont = lv_obj_create(lv_screen_active());
lv_obj_set_size(main_cont, 200, 150);
lv_obj_center(main_cont);
/*Create a transparent wrapper for the chart and the scale.
*Set a large width, to make it scrollable on the main container*/
lv_obj_t * wrapper = lv_obj_create(main_cont);
lv_obj_remove_style_all(wrapper);
lv_obj_set_size(wrapper, lv_pct(300), lv_pct(100));
lv_obj_set_flex_flow(wrapper, LV_FLEX_FLOW_COLUMN);
/*Create a chart on the wrapper
*Set it's width to 100% to fill the large wrapper*/
lv_obj_t * chart = lv_chart_create(wrapper);
lv_obj_set_width(chart, lv_pct(100));
lv_obj_set_flex_grow(chart, 1);
lv_chart_set_type(chart, LV_CHART_TYPE_BAR);
lv_chart_set_axis_range(chart, LV_CHART_AXIS_PRIMARY_Y, 0, 100);
lv_chart_set_axis_range(chart, LV_CHART_AXIS_SECONDARY_Y, 0, 400);
lv_chart_set_point_count(chart, 12);
lv_obj_set_style_radius(chart, 0, 0);
/*Create a scale also with 100% width*/
lv_obj_t * scale_bottom = lv_scale_create(wrapper);
lv_scale_set_mode(scale_bottom, LV_SCALE_MODE_HORIZONTAL_BOTTOM);
lv_obj_set_size(scale_bottom, lv_pct(100), 25);
lv_scale_set_total_tick_count(scale_bottom, 12);
lv_scale_set_major_tick_every(scale_bottom, 1);
lv_obj_set_style_pad_hor(scale_bottom, lv_chart_get_first_point_center_offset(chart), 0);
static const char * month[] = {"Jan", "Febr", "March", "Apr", "May", "Jun", "July", "Aug", "Sept", "Oct", "Nov", "Dec", NULL};
lv_scale_set_text_src(scale_bottom, month);
/*Add two data series*/
lv_chart_series_t * ser1 = lv_chart_add_series(chart, lv_palette_lighten(LV_PALETTE_GREEN, 2), LV_CHART_AXIS_PRIMARY_Y);
lv_chart_series_t * ser2 = lv_chart_add_series(chart, lv_palette_darken(LV_PALETTE_GREEN, 2), LV_CHART_AXIS_PRIMARY_Y);
/*Set the next points on 'ser1'*/
uint32_t i;
for(i = 0; i < 12; i++) {
lv_chart_set_next_value(chart, ser1, (int32_t)lv_rand(10, 60));
lv_chart_set_next_value(chart, ser2, (int32_t)lv_rand(50, 90));
}
lv_chart_refresh(chart); /*Required after direct set*/
}
#endif

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#include "../../lv_examples.h"
#if LV_USE_CHART && LV_BUILD_EXAMPLES
static void event_cb(lv_event_t * e)
{
lv_event_code_t code = lv_event_get_code(e);
lv_obj_t * chart = lv_event_get_target_obj(e);
if(code == LV_EVENT_VALUE_CHANGED) {
lv_obj_invalidate(chart);
}
if(code == LV_EVENT_REFR_EXT_DRAW_SIZE) {
int32_t * s = (int32_t *)lv_event_get_param(e);
*s = LV_MAX(*s, 20);
}
else if(code == LV_EVENT_DRAW_POST_END) {
uint32_t id = lv_chart_get_pressed_point(chart);
if(id == LV_CHART_POINT_NONE) return;
LV_LOG_USER("Selected point %d", (int)id);
lv_chart_series_t * ser = lv_chart_get_series_next(chart, NULL);
int32_t value = 0;
while(ser) {
lv_point_t p;
lv_chart_get_point_pos_by_id(chart, ser, id, &p);
int32_t * y_array = lv_chart_get_series_y_array(chart, ser);
if(y_array[id] != LV_CHART_POINT_NONE && y_array[id] >= 0) {
/*Accumulate the values to show the rectangles at the top of each segment*/
value += y_array[id];
/*Draw a rectangle above the clicked point*/
lv_layer_t * layer = lv_event_get_layer(e);
lv_draw_rect_dsc_t draw_rect_dsc;
lv_draw_rect_dsc_init(&draw_rect_dsc);
draw_rect_dsc.bg_color = lv_color_black();
draw_rect_dsc.bg_opa = LV_OPA_50;
draw_rect_dsc.radius = 3;
lv_area_t chart_obj_coords;
lv_obj_get_coords(chart, &chart_obj_coords);
lv_area_t rect_area;
rect_area.x1 = chart_obj_coords.x1 + p.x - 20;
rect_area.x2 = chart_obj_coords.x1 + p.x + 20;
rect_area.y1 = chart_obj_coords.y1 + p.y - 10;
rect_area.y2 = chart_obj_coords.y1 + p.y + 10;
lv_draw_rect(layer, &draw_rect_dsc, &rect_area);
/*Draw the value as label to the center of the rectangle*/
char buf[16];
lv_snprintf(buf, sizeof(buf), LV_SYMBOL_DUMMY"$%d", value);
lv_draw_label_dsc_t draw_label_dsc;
lv_draw_label_dsc_init(&draw_label_dsc);
draw_label_dsc.color = lv_color_white();
draw_label_dsc.text = buf;
draw_label_dsc.text_local = 1;
draw_label_dsc.align = LV_TEXT_ALIGN_CENTER;
lv_area_t label_area = rect_area;
lv_area_set_height(&label_area, lv_font_get_line_height(draw_label_dsc.font));
lv_area_align(&rect_area, &label_area, LV_ALIGN_CENTER, 0, 0);
lv_draw_label(layer, &draw_label_dsc, &label_area);
}
ser = lv_chart_get_series_next(chart, ser);
}
}
else if(code == LV_EVENT_RELEASED) {
lv_obj_invalidate(chart);
}
}
/**
* Show the value of the pressed points
*/
void lv_example_chart_3(void)
{
/*Create a chart*/
lv_obj_t * chart;
chart = lv_chart_create(lv_screen_active());
lv_obj_set_size(chart, 280, 180);
lv_obj_set_style_pad_column(chart, 4, 0);
lv_obj_center(chart);
lv_chart_set_type(chart, LV_CHART_TYPE_STACKED);
lv_obj_add_event_cb(chart, event_cb, LV_EVENT_ALL, NULL);
lv_obj_refresh_ext_draw_size(chart);
/*Add two data series*/
lv_chart_series_t * ser1 = lv_chart_add_series(chart, lv_palette_main(LV_PALETTE_RED), LV_CHART_AXIS_PRIMARY_Y);
lv_chart_series_t * ser2 = lv_chart_add_series(chart, lv_palette_main(LV_PALETTE_GREEN), LV_CHART_AXIS_PRIMARY_Y);
lv_chart_series_t * ser3 = lv_chart_add_series(chart, lv_palette_main(LV_PALETTE_BLUE), LV_CHART_AXIS_PRIMARY_Y);
uint32_t i;
for(i = 0; i < 10; i++) {
lv_chart_set_next_value(chart, ser1, lv_rand(15, 30));
lv_chart_set_next_value(chart, ser2, lv_rand(15, 30));
lv_chart_set_next_value(chart, ser3, lv_rand(15, 30));
}
}
#endif

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#include "../../lv_examples.h"
#if LV_USE_CHART && LV_DRAW_SW_COMPLEX && LV_BUILD_EXAMPLES
static void draw_event_cb(lv_event_t * e)
{
lv_draw_task_t * draw_task = lv_event_get_draw_task(e);
lv_draw_dsc_base_t * base_dsc = (lv_draw_dsc_base_t *)lv_draw_task_get_draw_dsc(draw_task);
if(base_dsc->part != LV_PART_ITEMS) {
return;
}
lv_draw_fill_dsc_t * fill_dsc = lv_draw_task_get_fill_dsc(draw_task);
if(fill_dsc) {
lv_obj_t * chart = lv_event_get_target_obj(e);
int32_t * y_array = lv_chart_get_series_y_array(chart, lv_chart_get_series_next(chart, NULL));
int32_t v = y_array[base_dsc->id2];
uint8_t ratio = (uint8_t)(v * 255 / 100);
fill_dsc->color = lv_color_mix(lv_palette_main(LV_PALETTE_GREEN), lv_palette_main(LV_PALETTE_RED), ratio);
}
}
/**
* Recolor the bars of a chart based on their value
*/
void lv_example_chart_4(void)
{
/*Create a chart1*/
lv_obj_t * chart = lv_chart_create(lv_screen_active());
lv_chart_set_type(chart, LV_CHART_TYPE_BAR);
lv_chart_set_point_count(chart, 24);
lv_obj_set_style_pad_column(chart, 2, 0);
lv_obj_set_size(chart, 260, 160);
lv_obj_center(chart);
lv_chart_series_t * ser = lv_chart_add_series(chart, lv_color_hex(0xff0000), LV_CHART_AXIS_PRIMARY_Y);
lv_obj_add_event_cb(chart, draw_event_cb, LV_EVENT_DRAW_TASK_ADDED, NULL);
lv_obj_add_flag(chart, LV_OBJ_FLAG_SEND_DRAW_TASK_EVENTS);
uint32_t i;
for(i = 0; i < 24; i++) {
lv_chart_set_next_value(chart, ser, (int32_t)lv_rand(10, 90));
}
}
#endif

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#include "../../lv_examples.h"
#if LV_USE_CHART && LV_DRAW_SW_COMPLEX && LV_BUILD_EXAMPLES
#include "../../../lvgl_private.h"
static void hook_division_lines(lv_event_t * e);
static void add_faded_area(lv_event_t * e);
static void draw_event_cb(lv_event_t * e);
/**
* Add a faded area effect to the line chart and make some division lines ticker
*/
void lv_example_chart_5(void)
{
/*Create a chart*/
lv_obj_t * chart = lv_chart_create(lv_screen_active());
lv_chart_set_type(chart, LV_CHART_TYPE_LINE); /*Show lines and points too*/
lv_obj_set_size(chart, 200, 150);
lv_obj_set_style_pad_all(chart, 0, 0);
lv_obj_set_style_radius(chart, 0, 0);
lv_obj_center(chart);
lv_chart_set_div_line_count(chart, 5, 7);
lv_obj_add_event_cb(chart, draw_event_cb, LV_EVENT_DRAW_TASK_ADDED, NULL);
lv_obj_add_flag(chart, LV_OBJ_FLAG_SEND_DRAW_TASK_EVENTS);
lv_chart_series_t * ser = lv_chart_add_series(chart, lv_palette_main(LV_PALETTE_RED), LV_CHART_AXIS_PRIMARY_Y);
uint32_t i;
for(i = 0; i < 10; i++) {
lv_chart_set_next_value(chart, ser, (int32_t)lv_rand(10, 80));
}
}
static void draw_event_cb(lv_event_t * e)
{
lv_draw_task_t * draw_task = lv_event_get_draw_task(e);
lv_draw_dsc_base_t * base_dsc = (lv_draw_dsc_base_t *)lv_draw_task_get_draw_dsc(draw_task);
if(base_dsc->part == LV_PART_ITEMS && lv_draw_task_get_type(draw_task) == LV_DRAW_TASK_TYPE_LINE) {
add_faded_area(e);
}
/*Hook the division lines too*/
if(base_dsc->part == LV_PART_MAIN && lv_draw_task_get_type(draw_task) == LV_DRAW_TASK_TYPE_LINE) {
hook_division_lines(e);
}
}
static void add_faded_area(lv_event_t * e)
{
lv_obj_t * obj = lv_event_get_target_obj(e);
lv_area_t coords;
lv_obj_get_coords(obj, &coords);
lv_draw_task_t * draw_task = lv_event_get_draw_task(e);
lv_draw_dsc_base_t * base_dsc = (lv_draw_dsc_base_t *)lv_draw_task_get_draw_dsc(draw_task);
const lv_chart_series_t * ser = lv_chart_get_series_next(obj, NULL);
lv_color_t ser_color = lv_chart_get_series_color(obj, ser);
/*Draw a triangle below the line witch some opacity gradient*/
lv_draw_line_dsc_t * draw_line_dsc = lv_draw_task_get_line_dsc(draw_task);
lv_draw_triangle_dsc_t tri_dsc;
lv_draw_triangle_dsc_init(&tri_dsc);
lv_point_precise_t p1;
lv_point_precise_t p2;
int32_t i;
for(i = 0; i < draw_line_dsc->point_cnt - 1; i++) {
p1 = draw_line_dsc->points[i];
p2 = draw_line_dsc->points[i + 1];
if(p1.x == LV_DRAW_LINE_POINT_NONE ||
p1.y == LV_DRAW_LINE_POINT_NONE) {
continue;
}
if(p2.x == LV_DRAW_LINE_POINT_NONE ||
p2.y == LV_DRAW_LINE_POINT_NONE) {
continue;
}
tri_dsc.p[0].x = p1.x;
tri_dsc.p[0].y = p1.y;
tri_dsc.p[1].x = p2.x;
tri_dsc.p[1].y = p2.y;
tri_dsc.p[2].x = p1.y < p2.y ? p1.x : p2.x;
tri_dsc.p[2].y = LV_MAX(p1.y, p2.y);
tri_dsc.grad.dir = LV_GRAD_DIR_VER;
int32_t full_h = lv_obj_get_height(obj);
int32_t fract_upper = (int32_t)(LV_MIN(p1.y, p2.y) - coords.y1) * 255 / full_h;
int32_t fract_lower = (int32_t)(LV_MAX(p1.y, p2.y) - coords.y1) * 255 / full_h;
tri_dsc.grad.stops[0].color = ser_color;
tri_dsc.grad.stops[0].opa = (lv_opa_t)(255 - fract_upper);
tri_dsc.grad.stops[0].frac = 0;
tri_dsc.grad.stops[1].color = ser_color;
tri_dsc.grad.stops[1].opa = (lv_opa_t)(255 - fract_lower);
tri_dsc.grad.stops[1].frac = 255;
lv_draw_triangle(base_dsc->layer, &tri_dsc);
/*Draw rectangle below the triangle*/
lv_draw_rect_dsc_t rect_dsc;
lv_draw_rect_dsc_init(&rect_dsc);
rect_dsc.bg_grad.dir = LV_GRAD_DIR_VER;
rect_dsc.bg_grad.stops[0].color = ser_color;
rect_dsc.bg_grad.stops[0].frac = 0;
rect_dsc.bg_grad.stops[0].opa = (lv_opa_t)(255 - fract_lower);
rect_dsc.bg_grad.stops[1].color = ser_color;
rect_dsc.bg_grad.stops[1].frac = 255;
rect_dsc.bg_grad.stops[1].opa = 0;
lv_area_t rect_area;
rect_area.x1 = (int32_t)p1.x;
rect_area.x2 = (int32_t)p2.x - 1;
rect_area.y1 = (int32_t)LV_MAX(p1.y, p2.y);
rect_area.y2 = (int32_t)coords.y2;
lv_draw_rect(base_dsc->layer, &rect_dsc, &rect_area);
}
}
static void hook_division_lines(lv_event_t * e)
{
lv_draw_task_t * draw_task = lv_event_get_draw_task(e);
lv_draw_dsc_base_t * base_dsc = (lv_draw_dsc_base_t *)lv_draw_task_get_draw_dsc(draw_task);
lv_draw_line_dsc_t * line_dsc = (lv_draw_line_dsc_t *)lv_draw_task_get_draw_dsc(draw_task);
/*Vertical line*/
if(line_dsc->p1.x == line_dsc->p2.x) {
line_dsc->color = lv_palette_lighten(LV_PALETTE_GREY, 1);
if(base_dsc->id1 == 3) {
line_dsc->width = 2;
line_dsc->dash_gap = 0;
line_dsc->dash_width = 0;
}
else {
line_dsc->width = 1;
line_dsc->dash_gap = 6;
line_dsc->dash_width = 6;
}
}
/*Horizontal line*/
else {
if(base_dsc->id1 == 2) {
line_dsc->width = 2;
line_dsc->dash_gap = 0;
line_dsc->dash_width = 0;
}
else {
line_dsc->width = 2;
line_dsc->dash_gap = 6;
line_dsc->dash_width = 6;
}
if(base_dsc->id1 == 1 || base_dsc->id1 == 3) {
line_dsc->color = lv_palette_main(LV_PALETTE_GREEN);
}
else {
line_dsc->color = lv_palette_lighten(LV_PALETTE_GREY, 1);
}
}
}
#endif

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#include "../../lv_examples.h"
#if LV_USE_CHART && LV_BUILD_EXAMPLES
static lv_obj_t * chart;
static lv_chart_series_t * ser;
static lv_chart_cursor_t * cursor;
static void value_changed_event_cb(lv_event_t * e)
{
uint32_t last_id;
lv_obj_t * obj = lv_event_get_target_obj(e);
last_id = lv_chart_get_pressed_point(obj);
if(last_id != LV_CHART_POINT_NONE) {
lv_chart_set_cursor_point(obj, cursor, NULL, last_id);
}
}
/**
* Show cursor on the clicked point
*/
void lv_example_chart_6(void)
{
chart = lv_chart_create(lv_screen_active());
lv_obj_set_size(chart, 200, 150);
lv_obj_align(chart, LV_ALIGN_CENTER, 0, -10);
lv_obj_add_event_cb(chart, value_changed_event_cb, LV_EVENT_VALUE_CHANGED, NULL);
lv_obj_refresh_ext_draw_size(chart);
cursor = lv_chart_add_cursor(chart, lv_palette_main(LV_PALETTE_BLUE), (lv_dir_t)(LV_DIR_LEFT | LV_DIR_BOTTOM));
ser = lv_chart_add_series(chart, lv_palette_main(LV_PALETTE_RED), LV_CHART_AXIS_PRIMARY_Y);
uint32_t i;
for(i = 0; i < 10; i++) {
lv_chart_set_next_value(chart, ser, (int32_t)lv_rand(10, 90));
}
lv_obj_t * label = lv_label_create(lv_screen_active());
lv_label_set_text(label, "Click on a point");
lv_obj_align_to(label, chart, LV_ALIGN_OUT_TOP_MID, 0, -5);
}
#endif

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#include "../../lv_examples.h"
#if LV_USE_CHART && LV_BUILD_EXAMPLES
static void draw_event_cb(lv_event_t * e)
{
lv_draw_task_t * draw_task = lv_event_get_draw_task(e);
lv_draw_dsc_base_t * base_dsc = (lv_draw_dsc_base_t *)lv_draw_task_get_draw_dsc(draw_task);
if(base_dsc->part != LV_PART_INDICATOR) return;
lv_obj_t * obj = lv_event_get_target_obj(e);
lv_chart_series_t * ser = lv_chart_get_series_next(obj, NULL);
lv_draw_fill_dsc_t * fill_draw_dsc = lv_draw_task_get_fill_dsc(draw_task);
if(fill_draw_dsc == NULL) return;
uint32_t cnt = lv_chart_get_point_count(obj);
/*Make older value more transparent*/
fill_draw_dsc->opa = (lv_opa_t)((LV_OPA_COVER * base_dsc->id2) / (cnt - 1));
/*Make smaller values blue, higher values red*/
int32_t * x_array = lv_chart_get_series_x_array(obj, ser);
int32_t * y_array = lv_chart_get_series_y_array(obj, ser);
/*dsc->id is the tells drawing order, but we need the ID of the point being drawn.*/
uint32_t start_point = lv_chart_get_x_start_point(obj, ser);
uint32_t p_act = (start_point + base_dsc->id2) % cnt; /*Consider start point to get the index of the array*/
lv_opa_t x_opa = (lv_opa_t)((x_array[p_act] * LV_OPA_50) / 200);
lv_opa_t y_opa = (lv_opa_t)((y_array[p_act] * LV_OPA_50) / 1000);
fill_draw_dsc->color = lv_color_mix(lv_palette_main(LV_PALETTE_RED),
lv_palette_main(LV_PALETTE_BLUE),
x_opa + y_opa);
}
static void add_data(lv_timer_t * timer)
{
lv_obj_t * chart = (lv_obj_t *)lv_timer_get_user_data(timer);
lv_chart_set_next_value2(chart, lv_chart_get_series_next(chart, NULL), (int32_t)lv_rand(0, 200),
(int32_t)lv_rand(0, 1000));
}
/**
* A scatter chart
*/
void lv_example_chart_7(void)
{
lv_obj_t * chart = lv_chart_create(lv_screen_active());
lv_obj_set_size(chart, 200, 150);
lv_obj_align(chart, LV_ALIGN_CENTER, 0, 0);
lv_obj_add_event_cb(chart, draw_event_cb, LV_EVENT_DRAW_TASK_ADDED, NULL);
lv_obj_add_flag(chart, LV_OBJ_FLAG_SEND_DRAW_TASK_EVENTS);
lv_obj_set_style_line_width(chart, 0, LV_PART_ITEMS); /*Remove the lines*/
lv_chart_set_type(chart, LV_CHART_TYPE_SCATTER);
lv_chart_set_axis_range(chart, LV_CHART_AXIS_PRIMARY_X, 0, 200);
lv_chart_set_axis_range(chart, LV_CHART_AXIS_PRIMARY_Y, 0, 1000);
lv_chart_set_point_count(chart, 50);
lv_chart_series_t * ser = lv_chart_add_series(chart, lv_palette_main(LV_PALETTE_RED), LV_CHART_AXIS_PRIMARY_Y);
uint32_t i;
for(i = 0; i < 50; i++) {
lv_chart_set_next_value2(chart, ser, (int32_t)lv_rand(0, 200), (int32_t)lv_rand(0, 1000));
}
lv_timer_create(add_data, 100, chart);
}
#endif

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#include "../../lv_examples.h"
#if LV_USE_CHART && LV_DRAW_SW_COMPLEX && LV_BUILD_EXAMPLES
static void add_data(lv_timer_t * t)
{
lv_obj_t * chart = (lv_obj_t *)lv_timer_get_user_data(t);
lv_chart_series_t * ser = lv_chart_get_series_next(chart, NULL);
lv_chart_set_next_value(chart, ser, (int32_t)lv_rand(10, 90));
uint32_t p = lv_chart_get_point_count(chart);
uint32_t s = lv_chart_get_x_start_point(chart, ser);
int32_t * a = lv_chart_get_series_y_array(chart, ser);
a[(s + 1) % p] = LV_CHART_POINT_NONE;
a[(s + 2) % p] = LV_CHART_POINT_NONE;
a[(s + 2) % p] = LV_CHART_POINT_NONE;
lv_chart_refresh(chart);
}
/**
* Circular line chart with gap
*/
void lv_example_chart_8(void)
{
/*Create a stacked_area_chart.obj*/
lv_obj_t * chart = lv_chart_create(lv_screen_active());
lv_chart_set_update_mode(chart, LV_CHART_UPDATE_MODE_CIRCULAR);
lv_obj_set_style_size(chart, 0, 0, LV_PART_INDICATOR);
lv_obj_set_size(chart, 280, 150);
lv_obj_center(chart);
lv_chart_set_point_count(chart, 80);
lv_chart_series_t * ser = lv_chart_add_series(chart, lv_palette_main(LV_PALETTE_RED), LV_CHART_AXIS_PRIMARY_Y);
/*Prefill with data*/
uint32_t i;
for(i = 0; i < 80; i++) {
lv_chart_set_next_value(chart, ser, (int32_t)lv_rand(10, 90));
}
lv_timer_create(add_data, 300, chart);
}
#endif

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Simple Checkboxes
-----------------
.. lv_example:: widgets/checkbox/lv_example_checkbox_1
:language: c
Checkboxes as radio buttons
---------------------------
.. lv_example:: widgets/checkbox/lv_example_checkbox_2
:language: c

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#include "../../lv_examples.h"
#if LV_USE_CHECKBOX && LV_BUILD_EXAMPLES
static void event_handler(lv_event_t * e)
{
lv_event_code_t code = lv_event_get_code(e);
lv_obj_t * obj = lv_event_get_target_obj(e);
LV_UNUSED(obj);
if(code == LV_EVENT_VALUE_CHANGED) {
const char * txt = lv_checkbox_get_text(obj);
const char * state = lv_obj_get_state(obj) & LV_STATE_CHECKED ? "Checked" : "Unchecked";
LV_UNUSED(txt);
LV_UNUSED(state);
LV_LOG_USER("%s: %s", txt, state);
}
}
void lv_example_checkbox_1(void)
{
lv_obj_set_flex_flow(lv_screen_active(), LV_FLEX_FLOW_COLUMN);
lv_obj_set_flex_align(lv_screen_active(), LV_FLEX_ALIGN_CENTER, LV_FLEX_ALIGN_START, LV_FLEX_ALIGN_CENTER);
lv_obj_t * cb;
cb = lv_checkbox_create(lv_screen_active());
lv_checkbox_set_text(cb, "Apple");
lv_obj_add_event_cb(cb, event_handler, LV_EVENT_ALL, NULL);
cb = lv_checkbox_create(lv_screen_active());
lv_checkbox_set_text(cb, "Banana");
lv_obj_add_state(cb, LV_STATE_CHECKED);
lv_obj_add_event_cb(cb, event_handler, LV_EVENT_ALL, NULL);
cb = lv_checkbox_create(lv_screen_active());
lv_checkbox_set_text(cb, "Lemon");
lv_obj_add_state(cb, LV_STATE_DISABLED);
lv_obj_add_event_cb(cb, event_handler, LV_EVENT_ALL, NULL);
cb = lv_checkbox_create(lv_screen_active());
lv_obj_add_state(cb, LV_STATE_CHECKED);
lv_obj_add_state(cb, LV_STATE_DISABLED);
lv_checkbox_set_text(cb, "Melon\nand a new line");
lv_obj_add_event_cb(cb, event_handler, LV_EVENT_ALL, NULL);
lv_obj_update_layout(cb);
}
#endif

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#include "../../lv_examples.h"
#if LV_USE_CHECKBOX && LV_BUILD_EXAMPLES
static lv_style_t style_radio;
static lv_style_t style_radio_chk;
static void event_cb(lv_event_t * e)
{
lv_obj_t * obj = lv_event_get_target_obj(e);
if(lv_obj_has_state(obj, LV_STATE_CHECKED)) {
LV_LOG_USER("%s is selected.", lv_checkbox_get_text(obj));
}
else {
LV_LOG_USER("%s is de-selected.", lv_checkbox_get_text(obj));
}
}
/**
* Checkboxes as radio buttons
*/
void lv_example_checkbox_2(void)
{
lv_style_init(&style_radio);
lv_style_set_radius(&style_radio, LV_RADIUS_CIRCLE);
lv_style_init(&style_radio_chk);
lv_style_set_bg_image_src(&style_radio_chk, NULL);
lv_obj_t * cont = lv_obj_create(lv_screen_active());
lv_obj_set_flex_flow(cont, LV_FLEX_FLOW_COLUMN);
lv_obj_set_size(cont, LV_SIZE_CONTENT, LV_SIZE_CONTENT);
lv_obj_center(cont);
uint32_t i;
char buf[32];
for(i = 0; i < 5; i++) {
lv_snprintf(buf, sizeof(buf), "Radio button %d", (int)i + 1);
lv_obj_t * obj = lv_checkbox_create(cont);
lv_checkbox_set_text(obj, buf);
lv_obj_add_event_cb(obj, event_cb, LV_EVENT_VALUE_CHANGED, NULL);
/*This makes the checkboxes act as radio buttons*/
lv_obj_set_radio_button(obj, true);
lv_obj_add_style(obj, &style_radio, LV_PART_INDICATOR);
lv_obj_add_style(obj, &style_radio_chk, LV_PART_INDICATOR | LV_STATE_CHECKED);
}
/*Make the first checkbox checked*/
// lv_obj_add_state(lv_obj_get_child(cont, 0), LV_STATE_CHECKED);
}
#endif

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Simple Drop down list
---------------------
.. lv_example:: widgets/dropdown/lv_example_dropdown_1
:language: c
Drop down in four directions
----------------------------
.. lv_example:: widgets/dropdown/lv_example_dropdown_2
:language: c
Menu
----
.. lv_example:: widgets/dropdown/lv_example_dropdown_3
:language: c

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#include "../../lv_examples.h"
#if LV_USE_DROPDOWN && LV_BUILD_EXAMPLES
static void event_handler(lv_event_t * e)
{
lv_event_code_t code = lv_event_get_code(e);
lv_obj_t * obj = lv_event_get_target_obj(e);
if(code == LV_EVENT_VALUE_CHANGED) {
char buf[32];
lv_dropdown_get_selected_str(obj, buf, sizeof(buf));
LV_LOG_USER("Option: %s", buf);
}
}
void lv_example_dropdown_1(void)
{
/*Create a normal drop down list*/
lv_obj_t * dd = lv_dropdown_create(lv_screen_active());
lv_dropdown_set_options(dd, "Apple\n"
"Banana\n"
"Orange\n"
"Cherry\n"
"Grape\n"
"Raspberry\n"
"Melon\n"
"Orange\n"
"Lemon\n"
"Nuts");
lv_obj_align(dd, LV_ALIGN_TOP_MID, 0, 20);
lv_obj_add_event_cb(dd, event_handler, LV_EVENT_ALL, NULL);
}
#endif

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#include "../../lv_examples.h"
#if LV_USE_DROPDOWN && LV_BUILD_EXAMPLES
/**
* Create a drop down, up, left and right menus
*/
void lv_example_dropdown_2(void)
{
static const char * opts = "Apple\n"
"Banana\n"
"Orange\n"
"Melon";
lv_obj_t * dd;
dd = lv_dropdown_create(lv_screen_active());
lv_dropdown_set_options_static(dd, opts);
lv_obj_align(dd, LV_ALIGN_TOP_MID, 0, 10);
dd = lv_dropdown_create(lv_screen_active());
lv_dropdown_set_options_static(dd, opts);
lv_dropdown_set_dir(dd, LV_DIR_BOTTOM);
lv_dropdown_set_symbol(dd, LV_SYMBOL_UP);
lv_obj_align(dd, LV_ALIGN_BOTTOM_MID, 0, -10);
dd = lv_dropdown_create(lv_screen_active());
lv_dropdown_set_options_static(dd, opts);
lv_dropdown_set_dir(dd, LV_DIR_RIGHT);
lv_dropdown_set_symbol(dd, LV_SYMBOL_RIGHT);
lv_obj_align(dd, LV_ALIGN_LEFT_MID, 10, 0);
dd = lv_dropdown_create(lv_screen_active());
lv_dropdown_set_options_static(dd, opts);
lv_dropdown_set_dir(dd, LV_DIR_LEFT);
lv_dropdown_set_symbol(dd, LV_SYMBOL_LEFT);
lv_obj_align(dd, LV_ALIGN_RIGHT_MID, -10, 0);
}
#endif

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#include "../../lv_examples.h"
#if LV_USE_DROPDOWN && LV_BUILD_EXAMPLES
static void event_cb(lv_event_t * e)
{
lv_obj_t * dropdown = lv_event_get_target_obj(e);
char buf[64];
lv_dropdown_get_selected_str(dropdown, buf, sizeof(buf));
LV_LOG_USER("'%s' is selected", buf);
}
/**
* Create a menu from a drop-down list and show some drop-down list features and styling
*/
void lv_example_dropdown_3(void)
{
/*Create a drop down list*/
lv_obj_t * dropdown = lv_dropdown_create(lv_screen_active());
lv_obj_align(dropdown, LV_ALIGN_TOP_LEFT, 10, 10);
lv_dropdown_set_options(dropdown, "New project\n"
"New file\n"
"Save\n"
"Save as ...\n"
"Open project\n"
"Recent projects\n"
"Preferences\n"
"Exit");
/*Set a fixed text to display on the button of the drop-down list*/
lv_dropdown_set_text(dropdown, "Menu");
/*Use a custom image as down icon and flip it when the list is opened*/
LV_IMAGE_DECLARE(img_caret_down);
lv_dropdown_set_symbol(dropdown, &img_caret_down);
lv_obj_set_style_transform_rotation(dropdown, 1800, LV_PART_INDICATOR | LV_STATE_CHECKED);
/*In a menu we don't need to show the last clicked item*/
lv_dropdown_set_selected_highlight(dropdown, false);
lv_obj_add_event_cb(dropdown, event_cb, LV_EVENT_VALUE_CHANGED, NULL);
}
#endif

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Image from variable and symbol
------------------------------
.. lv_example:: widgets/image/lv_example_image_1
:language: c
Image recoloring
----------------
.. lv_example:: widgets/image/lv_example_image_2
:language: c
Rotate and zoom
---------------
.. lv_example:: widgets/image/lv_example_image_3
:language: c
Image offset and styling
------------------------
.. lv_example:: widgets/image/lv_example_image_4
:language: c

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#include "../../lv_examples.h"
#if LV_USE_IMAGE && LV_BUILD_EXAMPLES
void lv_example_image_1(void)
{
LV_IMAGE_DECLARE(img_cogwheel_argb);
lv_obj_t * img1 = lv_image_create(lv_screen_active());
lv_image_set_src(img1, &img_cogwheel_argb);
lv_obj_align(img1, LV_ALIGN_CENTER, 0, 0);
lv_obj_t * img2 = lv_image_create(lv_screen_active());
lv_image_set_src(img2, LV_SYMBOL_OK "Accept");
lv_obj_align_to(img2, img1, LV_ALIGN_OUT_BOTTOM_MID, 0, 20);
}
#endif

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#include "../../lv_examples.h"
#if LV_USE_IMAGE && LV_USE_SLIDER && LV_BUILD_EXAMPLES
static lv_obj_t * create_slider(lv_color_t color);
static void slider_event_cb(lv_event_t * e);
static lv_obj_t * red_slider, * green_slider, * blue_slider, * intense_slider;
static lv_obj_t * img1;
/**
* Demonstrate runtime image re-coloring
*/
void lv_example_image_2(void)
{
/*Create 4 sliders to adjust RGB color and re-color intensity*/
red_slider = create_slider(lv_palette_main(LV_PALETTE_RED));
green_slider = create_slider(lv_palette_main(LV_PALETTE_GREEN));
blue_slider = create_slider(lv_palette_main(LV_PALETTE_BLUE));
intense_slider = create_slider(lv_palette_main(LV_PALETTE_GREY));
lv_slider_set_value(red_slider, LV_OPA_20, LV_ANIM_OFF);
lv_slider_set_value(green_slider, LV_OPA_90, LV_ANIM_OFF);
lv_slider_set_value(blue_slider, LV_OPA_60, LV_ANIM_OFF);
lv_slider_set_value(intense_slider, LV_OPA_50, LV_ANIM_OFF);
lv_obj_align(red_slider, LV_ALIGN_LEFT_MID, 25, 0);
lv_obj_align_to(green_slider, red_slider, LV_ALIGN_OUT_RIGHT_MID, 25, 0);
lv_obj_align_to(blue_slider, green_slider, LV_ALIGN_OUT_RIGHT_MID, 25, 0);
lv_obj_align_to(intense_slider, blue_slider, LV_ALIGN_OUT_RIGHT_MID, 25, 0);
/*Now create the actual image*/
LV_IMAGE_DECLARE(img_cogwheel_argb);
img1 = lv_image_create(lv_screen_active());
lv_image_set_src(img1, &img_cogwheel_argb);
lv_obj_align(img1, LV_ALIGN_RIGHT_MID, -20, 0);
lv_obj_send_event(intense_slider, LV_EVENT_VALUE_CHANGED, NULL);
}
static void slider_event_cb(lv_event_t * e)
{
LV_UNUSED(e);
/*Recolor the image based on the sliders' values*/
lv_color_t color = lv_color_make((uint8_t)lv_slider_get_value(red_slider),
(uint8_t)lv_slider_get_value(green_slider),
(uint8_t)lv_slider_get_value(blue_slider));
lv_opa_t intense = (lv_opa_t)lv_slider_get_value(intense_slider);
lv_obj_set_style_image_recolor_opa(img1, intense, 0);
lv_obj_set_style_image_recolor(img1, color, 0);
}
static lv_obj_t * create_slider(lv_color_t color)
{
lv_obj_t * slider = lv_slider_create(lv_screen_active());
lv_slider_set_range(slider, 0, 255);
lv_obj_set_size(slider, 10, 200);
lv_obj_set_style_bg_color(slider, color, LV_PART_KNOB);
lv_obj_set_style_bg_color(slider, lv_color_darken(color, LV_OPA_40), LV_PART_INDICATOR);
lv_obj_add_event_cb(slider, slider_event_cb, LV_EVENT_VALUE_CHANGED, NULL);
return slider;
}
#endif

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#include "../../lv_examples.h"
#if LV_USE_IMAGE && LV_BUILD_EXAMPLES
static void set_angle(void * img, int32_t v)
{
lv_image_set_rotation((lv_obj_t *)img, v);
}
static void set_scale(void * img, int32_t v)
{
lv_image_set_scale((lv_obj_t *)img, v);
}
/**
* Show transformations (zoom and rotation) using a pivot point.
*/
void lv_example_image_3(void)
{
LV_IMAGE_DECLARE(img_cogwheel_argb);
/*Now create the actual image*/
lv_obj_t * img = lv_image_create(lv_screen_active());
lv_image_set_src(img, &img_cogwheel_argb);
lv_obj_align(img, LV_ALIGN_CENTER, 50, 50);
lv_image_set_pivot(img, 0, 0); /*Rotate around the top left corner*/
lv_anim_t a;
lv_anim_init(&a);
lv_anim_set_var(&a, img);
lv_anim_set_exec_cb(&a, set_angle);
lv_anim_set_values(&a, 0, 3600);
lv_anim_set_duration(&a, 5000);
lv_anim_set_repeat_count(&a, LV_ANIM_REPEAT_INFINITE);
lv_anim_start(&a);
lv_anim_set_exec_cb(&a, set_scale);
lv_anim_set_values(&a, 128, 256);
lv_anim_set_reverse_duration(&a, 3000);
lv_anim_start(&a);
}
#endif

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#include "../../lv_examples.h"
#if LV_USE_IMAGE && LV_BUILD_EXAMPLES
static void ofs_y_anim(void * img, int32_t v)
{
lv_image_set_offset_y((lv_obj_t *)img, v);
}
/**
* Image styling and offset
*/
void lv_example_image_4(void)
{
LV_IMAGE_DECLARE(img_skew_strip);
static lv_style_t style;
lv_style_init(&style);
lv_style_set_bg_color(&style, lv_palette_main(LV_PALETTE_YELLOW));
lv_style_set_bg_opa(&style, LV_OPA_COVER);
lv_style_set_image_recolor_opa(&style, LV_OPA_COVER);
lv_style_set_image_recolor(&style, lv_color_black());
lv_obj_t * img = lv_image_create(lv_screen_active());
lv_obj_add_style(img, &style, 0);
lv_image_set_src(img, &img_skew_strip);
lv_obj_set_size(img, 150, 100);
lv_obj_center(img);
lv_anim_t a;
lv_anim_init(&a);
lv_anim_set_var(&a, img);
lv_anim_set_exec_cb(&a, ofs_y_anim);
lv_anim_set_values(&a, 0, 100);
lv_anim_set_duration(&a, 3000);
lv_anim_set_reverse_duration(&a, 500);
lv_anim_set_repeat_count(&a, LV_ANIM_REPEAT_INFINITE);
lv_anim_start(&a);
}
#endif

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#include "../../lv_examples.h"
#if LV_USE_IMAGE && LV_BUILD_EXAMPLES
void lv_example_image_5(void)
{
LV_IMAGE_DECLARE(img_svg_img);
lv_obj_t * img1 = lv_image_create(lv_screen_active());
lv_obj_set_size(img1, lv_pct(100), lv_pct(50));
lv_obj_set_style_outline_width(img1, 5, 0);
lv_image_set_src(img1, &img_svg_img);
lv_obj_set_style_transform_rotation(img1, 450, 0);
lv_obj_set_style_transform_scale(img1, 128, 0);
lv_image_set_scale(img1, 128);
lv_image_set_rotation(img1, 450);
lv_obj_align(img1, LV_ALIGN_CENTER, 0, 0);
}
#endif

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.. example_heading: Image Button
Simple Image button
-------------------
.. lv_example:: widgets/imagebutton/lv_example_imagebutton_1
:language: c

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#include "../../lv_examples.h"
#if LV_USE_IMAGEBUTTON && LV_BUILD_EXAMPLES
void lv_example_imagebutton_1(void)
{
LV_IMAGE_DECLARE(imagebutton_left);
LV_IMAGE_DECLARE(imagebutton_right);
LV_IMAGE_DECLARE(imagebutton_mid);
/*Create a transition animation on width transformation and recolor.*/
static lv_style_prop_t tr_prop[] = {LV_STYLE_TRANSFORM_WIDTH, LV_STYLE_IMAGE_RECOLOR_OPA, 0};
static lv_style_transition_dsc_t tr;
lv_style_transition_dsc_init(&tr, tr_prop, lv_anim_path_linear, 200, 0, NULL);
static lv_style_t style_def;
lv_style_init(&style_def);
lv_style_set_text_color(&style_def, lv_color_white());
lv_style_set_transition(&style_def, &tr);
/*Darken the button when pressed and make it wider*/
static lv_style_t style_pr;
lv_style_init(&style_pr);
lv_style_set_image_recolor_opa(&style_pr, LV_OPA_30);
lv_style_set_image_recolor(&style_pr, lv_color_black());
lv_style_set_transform_width(&style_pr, 20);
/*Create an image button*/
lv_obj_t * imagebutton1 = lv_imagebutton_create(lv_screen_active());
lv_imagebutton_set_src(imagebutton1, LV_IMAGEBUTTON_STATE_RELEASED, &imagebutton_left, &imagebutton_mid,
&imagebutton_right);
lv_obj_add_style(imagebutton1, &style_def, 0);
lv_obj_add_style(imagebutton1, &style_pr, LV_STATE_PRESSED);
lv_obj_set_width(imagebutton1, 100);
lv_obj_align(imagebutton1, LV_ALIGN_CENTER, 0, 0);
/*Create a label on the image button*/
lv_obj_t * label = lv_label_create(imagebutton1);
lv_label_set_text(label, "Button");
lv_obj_align(label, LV_ALIGN_CENTER, 0, -4);
}
#endif

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.. dir_order:
obj
animimg
arc
arclabel
bar
button
buttonmatrix
calendar
canvas
chart
checkbox
dropdown
image
imagebutton
keyboard
label
led
line
list
lottie
menu
msgbox
roller
scale
slider
span
spinbox
spinner
switch
table
tabview
textarea
tileview
win

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Keyboard with text area
-----------------------
.. lv_example:: widgets/keyboard/lv_example_keyboard_1
:language: c
Keyboard with custom map
------------------------
.. lv_example:: widgets/keyboard/lv_example_keyboard_2
:language: c
Keyboard with drawing
---------------------
.. lv_example:: widgets/keyboard/lv_example_keyboard_3
:language: c

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#include "../../lv_examples.h"
#if LV_USE_KEYBOARD && LV_BUILD_EXAMPLES
static void ta_event_cb(lv_event_t * e)
{
lv_event_code_t code = lv_event_get_code(e);
lv_obj_t * ta = lv_event_get_target_obj(e);
lv_obj_t * kb = (lv_obj_t *)lv_event_get_user_data(e);
if(code == LV_EVENT_FOCUSED) {
lv_keyboard_set_textarea(kb, ta);
lv_obj_remove_flag(kb, LV_OBJ_FLAG_HIDDEN);
}
if(code == LV_EVENT_DEFOCUSED) {
lv_keyboard_set_textarea(kb, NULL);
lv_obj_add_flag(kb, LV_OBJ_FLAG_HIDDEN);
}
}
void lv_example_keyboard_1(void)
{
/*Create a keyboard to use it with an of the text areas*/
lv_obj_t * kb = lv_keyboard_create(lv_screen_active());
/*Create a text area. The keyboard will write here*/
lv_obj_t * ta1;
ta1 = lv_textarea_create(lv_screen_active());
lv_obj_align(ta1, LV_ALIGN_TOP_LEFT, 10, 10);
lv_obj_add_event_cb(ta1, ta_event_cb, LV_EVENT_ALL, kb);
lv_textarea_set_placeholder_text(ta1, "Hello");
lv_obj_set_size(ta1, 140, 80);
lv_obj_t * ta2;
ta2 = lv_textarea_create(lv_screen_active());
lv_obj_align(ta2, LV_ALIGN_TOP_RIGHT, -10, 10);
lv_obj_add_event_cb(ta2, ta_event_cb, LV_EVENT_ALL, kb);
lv_obj_set_size(ta2, 140, 80);
lv_keyboard_set_textarea(kb, ta1);
/*The keyboard will show Arabic characters if they are enabled */
#if LV_USE_ARABIC_PERSIAN_CHARS && LV_FONT_DEJAVU_16_PERSIAN_HEBREW
lv_obj_set_style_text_font(kb, &lv_font_dejavu_16_persian_hebrew, 0);
lv_obj_set_style_text_font(ta1, &lv_font_dejavu_16_persian_hebrew, 0);
lv_obj_set_style_text_font(ta2, &lv_font_dejavu_16_persian_hebrew, 0);
#endif
}
#endif

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#include "../../lv_examples.h"
#if LV_USE_KEYBOARD && LV_BUILD_EXAMPLES
void lv_example_keyboard_2(void)
{
/*Create an AZERTY keyboard map*/
static const char * kb_map[] = {"A", "Z", "E", "R", "T", "Y", "U", "I", "O", "P", LV_SYMBOL_BACKSPACE, "\n",
"Q", "S", "D", "F", "G", "J", "K", "L", "M", LV_SYMBOL_NEW_LINE, "\n",
"W", "X", "C", "V", "B", "N", ",", ".", ":", "!", "?", "\n",
LV_SYMBOL_CLOSE, " ", " ", " ", LV_SYMBOL_OK, NULL
};
/*Set the relative width of the buttons and other controls*/
static const lv_buttonmatrix_ctrl_t kb_ctrl[] = {LV_BUTTONMATRIX_CTRL_WIDTH_4, LV_BUTTONMATRIX_CTRL_WIDTH_4, LV_BUTTONMATRIX_CTRL_WIDTH_4, LV_BUTTONMATRIX_CTRL_WIDTH_4, LV_BUTTONMATRIX_CTRL_WIDTH_4, LV_BUTTONMATRIX_CTRL_WIDTH_4, LV_BUTTONMATRIX_CTRL_WIDTH_4, LV_BUTTONMATRIX_CTRL_WIDTH_4, LV_BUTTONMATRIX_CTRL_WIDTH_4, LV_BUTTONMATRIX_CTRL_WIDTH_4, LV_BUTTONMATRIX_CTRL_WIDTH_6,
LV_BUTTONMATRIX_CTRL_WIDTH_4, LV_BUTTONMATRIX_CTRL_WIDTH_4, LV_BUTTONMATRIX_CTRL_WIDTH_4, LV_BUTTONMATRIX_CTRL_WIDTH_4, LV_BUTTONMATRIX_CTRL_WIDTH_4, LV_BUTTONMATRIX_CTRL_WIDTH_4, LV_BUTTONMATRIX_CTRL_WIDTH_4, LV_BUTTONMATRIX_CTRL_WIDTH_4, LV_BUTTONMATRIX_CTRL_WIDTH_4, LV_BUTTONMATRIX_CTRL_WIDTH_6,
LV_BUTTONMATRIX_CTRL_WIDTH_4, LV_BUTTONMATRIX_CTRL_WIDTH_4, LV_BUTTONMATRIX_CTRL_WIDTH_4, LV_BUTTONMATRIX_CTRL_WIDTH_4, LV_BUTTONMATRIX_CTRL_WIDTH_4, LV_BUTTONMATRIX_CTRL_WIDTH_4, LV_BUTTONMATRIX_CTRL_WIDTH_4, LV_BUTTONMATRIX_CTRL_WIDTH_4, LV_BUTTONMATRIX_CTRL_WIDTH_4, LV_BUTTONMATRIX_CTRL_WIDTH_4, LV_BUTTONMATRIX_CTRL_WIDTH_4,
LV_BUTTONMATRIX_CTRL_WIDTH_2, (lv_buttonmatrix_ctrl_t)(LV_BUTTONMATRIX_CTRL_HIDDEN | LV_BUTTONMATRIX_CTRL_WIDTH_2), LV_BUTTONMATRIX_CTRL_WIDTH_6, (lv_buttonmatrix_ctrl_t)(LV_BUTTONMATRIX_CTRL_HIDDEN | LV_BUTTONMATRIX_CTRL_WIDTH_2), LV_BUTTONMATRIX_CTRL_WIDTH_2
};
/*Create a keyboard and add the new map as USER_1 mode*/
lv_obj_t * kb = lv_keyboard_create(lv_screen_active());
lv_keyboard_set_map(kb, LV_KEYBOARD_MODE_USER_1, kb_map, kb_ctrl);
lv_keyboard_set_mode(kb, LV_KEYBOARD_MODE_USER_1);
/*Create a text area. The keyboard will write here*/
lv_obj_t * ta;
ta = lv_textarea_create(lv_screen_active());
lv_obj_align(ta, LV_ALIGN_TOP_MID, 0, 10);
lv_obj_set_size(ta, lv_pct(90), 80);
lv_obj_add_state(ta, LV_STATE_FOCUSED);
lv_keyboard_set_textarea(kb, ta);
}
#endif

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#include "../../lv_examples.h"
#if LV_USE_KEYBOARD && LV_BUILD_EXAMPLES
static void event_cb(lv_event_t * e)
{
lv_obj_t * obj = lv_event_get_target_obj(e);
lv_draw_task_t * draw_task = lv_event_get_draw_task(e);
lv_draw_dsc_base_t * base_dsc = (lv_draw_dsc_base_t *)lv_draw_task_get_draw_dsc(draw_task);
bool pressed = false;
if(lv_keyboard_get_selected_button(obj) == base_dsc->id1 && lv_obj_has_state(obj, LV_STATE_PRESSED)) {
pressed = true;
}
/*When the keyboard draws the buttons...*/
if(base_dsc->part == LV_PART_ITEMS) {
/*Get a color based on the button's index*/
lv_palette_t palette = (lv_palette_t)(base_dsc->id1 % LV_PALETTE_LAST);
lv_draw_fill_dsc_t * fill_draw_dsc = lv_draw_task_get_fill_dsc(draw_task);
if(fill_draw_dsc) {
fill_draw_dsc->color = pressed ? lv_palette_darken(palette, 3) : lv_palette_main(palette);
}
lv_draw_label_dsc_t * label_draw_dsc = lv_draw_task_get_label_dsc(draw_task);
if(label_draw_dsc) {
/*For the OK symbol, draw a star instead*/
if(lv_strcmp(label_draw_dsc->text, LV_SYMBOL_OK) == 0) {
label_draw_dsc->opa = 0; /*Hide the label*/
LV_IMAGE_DECLARE(img_star);
lv_image_header_t header;
lv_result_t res = lv_image_decoder_get_info(&img_star, &header);
if(res != LV_RESULT_OK) return;
lv_area_t a;
lv_area_set(&a, 0, 0, header.w - 1, header.h - 1);
lv_area_t draw_task_area;
lv_draw_task_get_area(draw_task, &draw_task_area);
lv_area_align(&draw_task_area, &a, LV_ALIGN_CENTER, 0, 0);
lv_draw_image_dsc_t img_draw_dsc;
lv_draw_image_dsc_init(&img_draw_dsc);
img_draw_dsc.src = &img_star;
lv_draw_image(base_dsc->layer, &img_draw_dsc, &a);
}
else {
/*For the other labels just pick an lighter color*/
label_draw_dsc->color = lv_palette_lighten(palette, 4);
}
}
}
}
/**
* Add custom drawer to the keyboard to customize the buttons one by one
*/
void lv_example_keyboard_3(void)
{
lv_obj_t * kb = lv_keyboard_create(lv_screen_active());
lv_obj_add_event_cb(kb, event_cb, LV_EVENT_DRAW_TASK_ADDED, NULL);
lv_obj_add_flag(kb, LV_OBJ_FLAG_SEND_DRAW_TASK_EVENTS);
lv_obj_center(kb);
}
#endif

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Line wrap, recoloring and scrolling
-----------------------------------
.. lv_example:: widgets/label/lv_example_label_1
:language: c
Text shadow
------------
.. lv_example:: widgets/label/lv_example_label_2
:language: c
Show LTR, RTL and Chinese texts
-------------------------------
.. lv_example:: widgets/label/lv_example_label_3
:language: c
Draw label with gradient color
------------------------------
.. lv_example:: widgets/label/lv_example_label_4
:language: c
Customize circular scrolling animation
--------------------------------------
.. lv_example:: widgets/label/lv_example_label_5
:language: c
Monospace font
--------------
.. lv_example:: widgets/label/lv_example_label_6
:language: c
Assign a translation tag to a label
-----------------------------------
.. lv_example:: widgets/label/lv_example_label_7
:language: c

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#include "../../lv_examples.h"
#if LV_USE_LABEL && LV_BUILD_EXAMPLES
/**
* Show line wrap, re-color, line align and text scrolling.
*/
void lv_example_label_1(void)
{
lv_obj_t * label1 = lv_label_create(lv_screen_active());
lv_label_set_long_mode(label1, LV_LABEL_LONG_MODE_WRAP); /*Break the long lines*/
lv_label_set_recolor(label1, true); /*Enable re-coloring by commands in the text*/
lv_label_set_text(label1, "#0000ff Re-color# #ff00ff words# #ff0000 of a# label, align the lines to the center "
"and wrap long text automatically.");
lv_obj_set_width(label1, 150); /*Set smaller width to make the lines wrap*/
lv_obj_set_style_text_align(label1, LV_TEXT_ALIGN_CENTER, 0);
lv_obj_align(label1, LV_ALIGN_CENTER, 0, -40);
lv_obj_t * label2 = lv_label_create(lv_screen_active());
lv_label_set_long_mode(label2, LV_LABEL_LONG_MODE_SCROLL_CIRCULAR); /*Circular scroll*/
lv_obj_set_width(label2, 150);
lv_label_set_text(label2, "It is a circularly scrolling text. ");
lv_obj_align(label2, LV_ALIGN_CENTER, 0, 40);
}
#endif

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#include "../../lv_examples.h"
#if LV_USE_LABEL && LV_BUILD_EXAMPLES
/**
* Create a fake text shadow
*/
void lv_example_label_2(void)
{
/*Create a style for the shadow*/
static lv_style_t style_shadow;
lv_style_init(&style_shadow);
lv_style_set_text_opa(&style_shadow, LV_OPA_30);
lv_style_set_text_color(&style_shadow, lv_color_black());
/*Create a label for the shadow first (it's in the background)*/
lv_obj_t * shadow_label = lv_label_create(lv_screen_active());
lv_obj_add_style(shadow_label, &style_shadow, 0);
/*Create the main label*/
lv_obj_t * main_label = lv_label_create(lv_screen_active());
lv_label_set_text(main_label, "A simple method to create\n"
"shadows on a text.\n"
"It even works with\n\n"
"newlines and spaces.");
/*Set the same text for the shadow label*/
lv_label_set_text(shadow_label, lv_label_get_text(main_label));
/*Position the main label*/
lv_obj_align(main_label, LV_ALIGN_CENTER, 0, 0);
/*Shift the second label down and to the right by 2 pixel*/
lv_obj_align_to(shadow_label, main_label, LV_ALIGN_TOP_LEFT, 2, 2);
}
#endif

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#include "../../lv_examples.h"
#if LV_USE_LABEL && LV_BUILD_EXAMPLES && LV_FONT_DEJAVU_16_PERSIAN_HEBREW && LV_FONT_SOURCE_HAN_SANS_SC_16_CJK && LV_USE_BIDI
/**
* Show mixed LTR, RTL and Chinese label
*/
void lv_example_label_3(void)
{
lv_obj_t * ltr_label = lv_label_create(lv_screen_active());
lv_label_set_text(ltr_label, "In modern terminology, a microcontroller is similar to a system on a chip (SoC).");
lv_obj_set_style_text_font(ltr_label, &lv_font_montserrat_16, 0);
lv_obj_set_width(ltr_label, 310);
lv_obj_align(ltr_label, LV_ALIGN_TOP_LEFT, 5, 5);
lv_obj_t * rtl_label = lv_label_create(lv_screen_active());
lv_label_set_text(rtl_label,
"מעבד, או בשמו המלא יחידת עיבוד מרכזית (באנגלית: CPU - Central Processing Unit).");
lv_obj_set_style_base_dir(rtl_label, LV_BASE_DIR_RTL, 0);
lv_obj_set_style_text_font(rtl_label, &lv_font_dejavu_16_persian_hebrew, 0);
lv_obj_set_width(rtl_label, 310);
lv_obj_align(rtl_label, LV_ALIGN_LEFT_MID, 5, 0);
lv_obj_t * cz_label = lv_label_create(lv_screen_active());
lv_label_set_text(cz_label,
"嵌入式系统（Embedded System），\n是一种嵌入机械或电气系统内部、具有专一功能和实时计算性能的计算机系统。");
lv_obj_set_style_text_font(cz_label, &lv_font_source_han_sans_sc_16_cjk, 0);
lv_obj_set_width(cz_label, 310);
lv_obj_align(cz_label, LV_ALIGN_BOTTOM_LEFT, 5, -5);
}
#endif

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#include "../../lv_examples.h"
#if LV_USE_LABEL && LV_FONT_MONTSERRAT_24 && LV_USE_CANVAS && LV_BUILD_EXAMPLES && LV_DRAW_SW_COMPLEX
#define MASK_WIDTH 150
#define MASK_HEIGHT 60
static void generate_mask(lv_draw_buf_t * mask, int32_t w, int32_t h, const char * txt)
{
/*Create a "8 bit alpha" canvas and clear it*/
lv_obj_t * canvas = lv_canvas_create(lv_screen_active());
lv_canvas_set_draw_buf(canvas, mask);
lv_canvas_fill_bg(canvas, lv_color_black(), LV_OPA_TRANSP);
lv_layer_t layer;
lv_canvas_init_layer(canvas, &layer);
/*Draw a label to the canvas. The result "image" will be used as mask*/
lv_draw_label_dsc_t label_dsc;
lv_draw_label_dsc_init(&label_dsc);
label_dsc.color = lv_color_white();
label_dsc.align = LV_TEXT_ALIGN_CENTER;
label_dsc.text = txt;
label_dsc.font = &lv_font_montserrat_24;
lv_area_t a = {0, 0, w - 1, h - 1};
lv_draw_label(&layer, &label_dsc, &a);
lv_canvas_finish_layer(canvas, &layer);
lv_obj_delete(canvas);
}
/**
* Draw label with gradient color
*/
void lv_example_label_4(void)
{
/* Create the mask of a text by drawing it to a canvas*/
LV_DRAW_BUF_DEFINE_STATIC(mask, MASK_WIDTH, MASK_HEIGHT, LV_COLOR_FORMAT_L8);
LV_DRAW_BUF_INIT_STATIC(mask);
generate_mask(&mask, MASK_WIDTH, MASK_HEIGHT, "Text with gradient");
/* Create an object from where the text will be masked out.
* Now it's a rectangle with a gradient but it could be an image too*/
lv_obj_t * grad = lv_obj_create(lv_screen_active());
lv_obj_set_size(grad, MASK_WIDTH, MASK_HEIGHT);
lv_obj_center(grad);
lv_obj_set_style_bg_color(grad, lv_color_hex(0xff0000), 0);
lv_obj_set_style_bg_grad_color(grad, lv_color_hex(0x0000ff), 0);
lv_obj_set_style_bg_grad_dir(grad, LV_GRAD_DIR_HOR, 0);
lv_obj_set_style_bitmap_mask_src(grad, &mask, 0);
}
#endif

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#include "../../lv_examples.h"
#if LV_USE_LABEL && LV_BUILD_EXAMPLES
/**
* Show customizing the circular scrolling animation of a label with `LV_LABEL_LONG_MODE_SCROLL_CIRCULAR`
* long mode.
*/
void lv_example_label_5(void)
{
static lv_anim_t animation_template;
static lv_style_t label_style;
lv_anim_init(&animation_template);
lv_anim_set_delay(&animation_template, 1000); /*Wait 1 second to start the first scroll*/
lv_anim_set_repeat_delay(&animation_template,
3000); /*Repeat the scroll 3 seconds after the label scrolls back to the initial position*/
lv_anim_set_repeat_count(&animation_template, LV_ANIM_REPEAT_INFINITE);
/*Initialize the label style with the animation template*/
lv_style_init(&label_style);
lv_style_set_anim(&label_style, &animation_template);
lv_obj_t * label1 = lv_label_create(lv_screen_active());
lv_label_set_long_mode(label1, LV_LABEL_LONG_MODE_SCROLL_CIRCULAR); /*Circular scroll*/
lv_obj_set_width(label1, 150);
lv_label_set_text(label1, "It is a circularly scrolling text. ");
lv_obj_align(label1, LV_ALIGN_CENTER, 0, 40);
lv_obj_add_style(label1, &label_style, LV_STATE_DEFAULT); /*Add the style to the label*/
}
#endif

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#include "../../lv_examples.h"
#if LV_USE_LABEL && LV_BUILD_EXAMPLES && LV_FONT_MONTSERRAT_20
static bool fix_w_get_glyph_dsc(const lv_font_t * font, lv_font_glyph_dsc_t * dsc, uint32_t letter,
uint32_t letter_next)
{
bool ret = lv_font_get_glyph_dsc_fmt_txt(font, dsc, letter, letter_next);
if(!ret) return false;
/* Set a fixed width */
dsc->adv_w = 20;
dsc->ofs_x = (dsc->adv_w - dsc->box_w) / 2;
return true;
}
void lv_example_label_6(void)
{
/* Clone the original font and override its behavior */
static lv_font_t mono_font;
mono_font = lv_font_montserrat_20;
mono_font.get_glyph_dsc = fix_w_get_glyph_dsc;
/* Create a label with normal font */
lv_obj_t * label1 = lv_label_create(lv_screen_active());
lv_obj_set_style_text_font(label1, &lv_font_montserrat_20, 0);
lv_label_set_text(label1, "0123.Wabc");
/* Create a label with fixed-width glyph descriptor override */
lv_obj_t * label2 = lv_label_create(lv_screen_active());
lv_obj_set_y(label2, 30);
lv_obj_set_style_text_font(label2, &mono_font, 0);
lv_label_set_text(label2, "0123.Wabc");
}
#endif

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#include "../../lv_examples.h"
#if LV_USE_TRANSLATION && LV_USE_DROPDOWN && LV_USE_LABEL && LV_BUILD_EXAMPLES
/* Arrays are defined `const` to place them in program space instead of RAM. */
static const char * const tags[] = {"tiger", "lion", "rabbit", "elephant", NULL};
static const char * const languages[] = {"English", "Deutsch", "Español", NULL};
static void add_static_translations(void)
{
static const char * const translations[] = {
"The Tiger", "Der Tiger", "El Tigre",
"The Lion", "Der Löwe", "El León",
"The Rabbit", "Das Kaninchen", "El Conejo",
"The Elephant", "Der Elefant", "El Elefante",
};
lv_translation_add_static(languages, tags, translations);
}
static void language_change_cb(lv_event_t * e)
{
static char selected_lang[20];
lv_obj_t * dropdown = lv_event_get_target_obj(e);
lv_dropdown_get_selected_str(dropdown, selected_lang, sizeof(selected_lang));
lv_translation_set_language(selected_lang);
}
/**
* Use a translation tag in labels
*/
void lv_example_label_7(void)
{
lv_obj_set_flex_flow(lv_screen_active(), LV_FLEX_FLOW_COLUMN);
lv_obj_set_flex_align(lv_screen_active(), LV_FLEX_ALIGN_CENTER, LV_FLEX_ALIGN_CENTER, LV_FLEX_ALIGN_CENTER);
add_static_translations();
const size_t tag_count = sizeof(tags) / sizeof(tags[0]) - 1;
const size_t lang_count = sizeof(languages) / sizeof(languages[0]) - 1;
/* Create a dropdown to be able to select the language */
lv_obj_t * language_dropdown = lv_dropdown_create(lv_screen_active());
lv_dropdown_clear_options(language_dropdown);
for(size_t i = 0; i < lang_count; ++i) {
lv_dropdown_add_option(language_dropdown, languages[i], i);
}
lv_obj_add_event_cb(language_dropdown, language_change_cb, LV_EVENT_VALUE_CHANGED, NULL);
lv_translation_set_language("English");
/* Create a label for each tag */
for(size_t i = 0; i < tag_count; ++i) {
lv_obj_t * label = lv_label_create(lv_screen_active());
lv_label_set_translation_tag(label, tags[i]);
}
}
#endif /*LV_USE_TRANSLATION && LV_USE_DROPDOWN && LV_USE_LABEL && LV_BUILD_EXAMPLES*/

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.. example_heading: LED
LED with custom style
---------------------
.. lv_example:: widgets/led/lv_example_led_1
:language: c

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#include "../../lv_examples.h"
#if LV_USE_LED && LV_BUILD_EXAMPLES
/**
* Create LED's with different brightness and color
*/
void lv_example_led_1(void)
{
/*Create a LED and switch it OFF*/
lv_obj_t * led1 = lv_led_create(lv_screen_active());
lv_obj_align(led1, LV_ALIGN_CENTER, -80, 0);
lv_led_off(led1);
/*Copy the previous LED and set a brightness*/
lv_obj_t * led2 = lv_led_create(lv_screen_active());
lv_obj_align(led2, LV_ALIGN_CENTER, 0, 0);
lv_led_set_brightness(led2, 150);
lv_led_set_color(led2, lv_palette_main(LV_PALETTE_RED));
/*Copy the previous LED and switch it ON*/
lv_obj_t * led3 = lv_led_create(lv_screen_active());
lv_obj_align(led3, LV_ALIGN_CENTER, 80, 0);
lv_led_on(led3);
}
#endif

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Simple Line
-----------
.. lv_example:: widgets/line/lv_example_line_1
:language: c

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#include "../../lv_examples.h"
#if LV_USE_LINE && LV_BUILD_EXAMPLES
void lv_example_line_1(void)
{
/*Create an array for the points of the line*/
static lv_point_precise_t line_points[] = { {5, 5}, {70, 70}, {120, 10}, {180, 60}, {240, 10} };
/*Create style*/
static lv_style_t style_line;
lv_style_init(&style_line);
lv_style_set_line_width(&style_line, 8);
lv_style_set_line_color(&style_line, lv_palette_main(LV_PALETTE_BLUE));
lv_style_set_line_rounded(&style_line, true);
/*Create a line and apply the new style*/
lv_obj_t * line1;
line1 = lv_line_create(lv_screen_active());
lv_line_set_points(line1, line_points, 5); /*Set the points*/
lv_obj_add_style(line1, &style_line, 0);
lv_obj_center(line1);
}
#endif

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Simple List
-----------
.. lv_example:: widgets/list/lv_example_list_1
:language: c
Sorting a List using up and down buttons
----------------------------------------
.. lv_example:: widgets/list/lv_example_list_2
:language: c

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#include "../../lv_examples.h"
#if LV_USE_LIST && LV_BUILD_EXAMPLES
static lv_obj_t * list1;
static void event_handler(lv_event_t * e)
{
lv_event_code_t code = lv_event_get_code(e);
lv_obj_t * obj = lv_event_get_target_obj(e);
LV_UNUSED(obj);
if(code == LV_EVENT_CLICKED) {
LV_LOG_USER("Clicked: %s", lv_list_get_button_text(list1, obj));
}
}
void lv_example_list_1(void)
{
/*Create a list*/
list1 = lv_list_create(lv_screen_active());
lv_obj_set_size(list1, 180, 220);
lv_obj_center(list1);
/*Add buttons to the list*/
lv_obj_t * btn;
lv_list_add_text(list1, "File");
btn = lv_list_add_button(list1, LV_SYMBOL_FILE, "New");
lv_obj_add_event_cb(btn, event_handler, LV_EVENT_CLICKED, NULL);
btn = lv_list_add_button(list1, LV_SYMBOL_DIRECTORY, "Open");
lv_obj_add_event_cb(btn, event_handler, LV_EVENT_CLICKED, NULL);
btn = lv_list_add_button(list1, LV_SYMBOL_SAVE, "Save");
lv_obj_add_event_cb(btn, event_handler, LV_EVENT_CLICKED, NULL);
btn = lv_list_add_button(list1, LV_SYMBOL_CLOSE, "Delete");
lv_obj_add_event_cb(btn, event_handler, LV_EVENT_CLICKED, NULL);
btn = lv_list_add_button(list1, LV_SYMBOL_EDIT, "Edit");
lv_obj_add_event_cb(btn, event_handler, LV_EVENT_CLICKED, NULL);
lv_list_add_text(list1, "Connectivity");
btn = lv_list_add_button(list1, LV_SYMBOL_BLUETOOTH, "Bluetooth");
lv_obj_add_event_cb(btn, event_handler, LV_EVENT_CLICKED, NULL);
btn = lv_list_add_button(list1, LV_SYMBOL_GPS, "Navigation");
lv_obj_add_event_cb(btn, event_handler, LV_EVENT_CLICKED, NULL);
btn = lv_list_add_button(list1, LV_SYMBOL_USB, "USB");
lv_obj_add_event_cb(btn, event_handler, LV_EVENT_CLICKED, NULL);
btn = lv_list_add_button(list1, LV_SYMBOL_BATTERY_FULL, "Battery");
lv_obj_add_event_cb(btn, event_handler, LV_EVENT_CLICKED, NULL);
lv_list_add_text(list1, "Exit");
btn = lv_list_add_button(list1, LV_SYMBOL_OK, "Apply");
lv_obj_add_event_cb(btn, event_handler, LV_EVENT_CLICKED, NULL);
btn = lv_list_add_button(list1, LV_SYMBOL_CLOSE, "Close");
lv_obj_add_event_cb(btn, event_handler, LV_EVENT_CLICKED, NULL);
}
#endif

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#include "../../lv_examples.h"
#if LV_USE_LIST && LV_BUILD_EXAMPLES
static lv_obj_t * list1;
static lv_obj_t * list2;
static lv_obj_t * currentButton = NULL;
static void event_handler(lv_event_t * e)
{
lv_event_code_t code = lv_event_get_code(e);
lv_obj_t * obj = lv_event_get_target_obj(e);
if(code == LV_EVENT_CLICKED) {
LV_LOG_USER("Clicked: %s", lv_list_get_button_text(list1, obj));
if(currentButton == obj) {
currentButton = NULL;
}
else {
currentButton = obj;
}
lv_obj_t * parent = lv_obj_get_parent(obj);
int32_t i;
for(i = 0; i < (int32_t)lv_obj_get_child_count(parent); i++) {
lv_obj_t * child = lv_obj_get_child(parent, i);
if(child == currentButton) {
lv_obj_add_state(child, LV_STATE_CHECKED);
}
else {
lv_obj_remove_state(child, LV_STATE_CHECKED);
}
}
}
}
static void event_handler_top(lv_event_t * e)
{
lv_event_code_t code = lv_event_get_code(e);
if(code == LV_EVENT_CLICKED) {
if(currentButton == NULL) return;
lv_obj_move_to_index(currentButton, 0);
lv_obj_scroll_to_view(currentButton, LV_ANIM_ON);
}
}
static void event_handler_up(lv_event_t * e)
{
lv_event_code_t code = lv_event_get_code(e);
if((code == LV_EVENT_CLICKED) || (code == LV_EVENT_LONG_PRESSED_REPEAT)) {
if(currentButton == NULL) return;
int32_t index = lv_obj_get_index(currentButton);
if(index <= 0) return;
lv_obj_move_to_index(currentButton, index - 1);
lv_obj_scroll_to_view(currentButton, LV_ANIM_ON);
}
}
static void event_handler_center(lv_event_t * e)
{
const lv_event_code_t code = lv_event_get_code(e);
if((code == LV_EVENT_CLICKED) || (code == LV_EVENT_LONG_PRESSED_REPEAT)) {
if(currentButton == NULL) return;
lv_obj_t * parent = lv_obj_get_parent(currentButton);
const int32_t pos = (int32_t)lv_obj_get_child_count(parent) / 2;
lv_obj_move_to_index(currentButton, pos);
lv_obj_scroll_to_view(currentButton, LV_ANIM_ON);
}
}
static void event_handler_dn(lv_event_t * e)
{
const lv_event_code_t code = lv_event_get_code(e);
if((code == LV_EVENT_CLICKED) || (code == LV_EVENT_LONG_PRESSED_REPEAT)) {
if(currentButton == NULL) return;
const int32_t index = lv_obj_get_index(currentButton);
lv_obj_move_to_index(currentButton, index + 1);
lv_obj_scroll_to_view(currentButton, LV_ANIM_ON);
}
}
static void event_handler_bottom(lv_event_t * e)
{
const lv_event_code_t code = lv_event_get_code(e);
if(code == LV_EVENT_CLICKED) {
if(currentButton == NULL) return;
lv_obj_move_to_index(currentButton, -1);
lv_obj_scroll_to_view(currentButton, LV_ANIM_ON);
}
}
static void event_handler_swap(lv_event_t * e)
{
const lv_event_code_t code = lv_event_get_code(e);
if((code == LV_EVENT_CLICKED) || (code == LV_EVENT_LONG_PRESSED_REPEAT)) {
uint32_t cnt = lv_obj_get_child_count(list1);
for(int i = 0; i < 100; i++) {
lv_obj_t * obj = lv_obj_get_child(list1, (int32_t)lv_rand(0, cnt - 1));
lv_obj_move_to_index(obj, (int32_t)lv_rand(0, cnt - 1));
if(currentButton != NULL) {
lv_obj_scroll_to_view(currentButton, LV_ANIM_ON);
}
}
}
}
void lv_example_list_2(void)
{
/*Create a list*/
list1 = lv_list_create(lv_screen_active());
lv_obj_set_size(list1, lv_pct(60), lv_pct(100));
lv_obj_set_style_pad_row(list1, 5, 0);
/*Add buttons to the list*/
lv_obj_t * btn;
int i;
for(i = 0; i < 15; i++) {
btn = lv_button_create(list1);
lv_obj_set_width(btn, lv_pct(50));
lv_obj_add_event_cb(btn, event_handler, LV_EVENT_CLICKED, NULL);
lv_obj_t * lab = lv_label_create(btn);
lv_label_set_text_fmt(lab, "Item %d", i);
}
/*Select the first button by default*/
currentButton = lv_obj_get_child(list1, 0);
lv_obj_add_state(currentButton, LV_STATE_CHECKED);
/*Create a second list with up and down buttons*/
list2 = lv_list_create(lv_screen_active());
lv_obj_set_size(list2, lv_pct(40), lv_pct(100));
lv_obj_align(list2, LV_ALIGN_TOP_RIGHT, 0, 0);
lv_obj_set_flex_flow(list2, LV_FLEX_FLOW_COLUMN);
btn = lv_list_add_button(list2, NULL, "Top");
lv_obj_add_event_cb(btn, event_handler_top, LV_EVENT_ALL, NULL);
lv_group_remove_obj(btn);
btn = lv_list_add_button(list2, LV_SYMBOL_UP, "Up");
lv_obj_add_event_cb(btn, event_handler_up, LV_EVENT_ALL, NULL);
lv_group_remove_obj(btn);
btn = lv_list_add_button(list2, LV_SYMBOL_LEFT, "Center");
lv_obj_add_event_cb(btn, event_handler_center, LV_EVENT_ALL, NULL);
lv_group_remove_obj(btn);
btn = lv_list_add_button(list2, LV_SYMBOL_DOWN, "Down");
lv_obj_add_event_cb(btn, event_handler_dn, LV_EVENT_ALL, NULL);
lv_group_remove_obj(btn);
btn = lv_list_add_button(list2, NULL, "Bottom");
lv_obj_add_event_cb(btn, event_handler_bottom, LV_EVENT_ALL, NULL);
lv_group_remove_obj(btn);
btn = lv_list_add_button(list2, LV_SYMBOL_SHUFFLE, "Shuffle");
lv_obj_add_event_cb(btn, event_handler_swap, LV_EVENT_ALL, NULL);
lv_group_remove_obj(btn);
}
#endif

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Load a Lottie animation from an array
-------------------------------------
.. lv_example:: widgets/lottie/lv_example_lottie_1
:language: c
Load a Lottie animation from file
---------------------------------
.. lv_example:: widgets/lottie/lv_example_lottie_2
:language: c

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#include "../../lv_examples.h"
#if LV_BUILD_EXAMPLES
#if LV_USE_LOTTIE
/**
* Load an lottie animation from data
*/
void lv_example_lottie_1(void)
{
extern const uint8_t lv_example_lottie_approve[];
extern const size_t lv_example_lottie_approve_size;
lv_obj_t * lottie = lv_lottie_create(lv_screen_active());
lv_lottie_set_src_data(lottie, lv_example_lottie_approve, lv_example_lottie_approve_size);
#if LV_DRAW_BUF_ALIGN == 4 && LV_DRAW_BUF_STRIDE_ALIGN == 1
/*If there are no special requirements, just declare a buffer
x4 because the Lottie is rendered in ARGB8888_PREMULTIPLIED format*/
static uint8_t buf[64 * 64 * 4];
lv_lottie_set_buffer(lottie, 64, 64, buf);
#else
/*For GPUs and special alignment/strid setting use a draw_buf instead*/
LV_DRAW_BUF_DEFINE_STATIC(draw_buf, 64, 64, LV_COLOR_FORMAT_ARGB8888_PREMULTIPLIED);
lv_lottie_set_draw_buf(lottie, &draw_buf);
#endif
lv_obj_center(lottie);
}
#else
void lv_example_lottie_1(void)
{
/*fallback for online examples*/
lv_obj_t * label = lv_label_create(lv_screen_active());
lv_label_set_text(label, "Lottie cannot be previewed online");
lv_obj_center(label);
}
#endif /*LV_USE_LOTTIE*/
#endif /*LV_BUILD_EXAMPLES*/

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#include "../../lv_examples.h"
#if LV_BUILD_EXAMPLES
#if LV_USE_LOTTIE
/**
* Load an lottie animation from file
*/
void lv_example_lottie_2(void)
{
lv_obj_t * lottie = lv_lottie_create(lv_screen_active());
lv_lottie_set_src_file(lottie, "lvgl/examples/widgets/lottie/lv_example_lottie_approve.json");
#if LV_DRAW_BUF_ALIGN == 4 && LV_DRAW_BUF_STRIDE_ALIGN == 1
/*If there are no special requirements, just declare a buffer
x4 because the Lottie is rendered in ARGB8888_PREMULTIPLIED format*/
static uint8_t buf[64 * 64 * 4];
lv_lottie_set_buffer(lottie, 64, 64, buf);
#else
/*For GPUs and special alignment/strid setting use a draw_buf instead*/
LV_DRAW_BUF_DEFINE_STATIC(draw_buf, 64, 64, LV_COLOR_FORMAT_ARGB8888_PREMULTIPLIED);
lv_lottie_set_draw_buf(lottie, &draw_buf);
#endif
lv_obj_center(lottie);
}
#else
void lv_example_lottie_2(void)
{
/*fallback for online examples*/
lv_obj_t * label = lv_label_create(lv_screen_active());
lv_label_set_text(label, "Lottie cannot be previewed online");
lv_obj_center(label);
}
#endif /*LV_USE_LOTTIE*/
#endif /*LV_BUILD_EXAMPLES*/

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/* The original JSON string is converted to hex array because C99 requires support only 4096 character long strings.
lvgl/scripts/tohex.py is sued to convert a json file to a hex array. E.g.
./filetohex.py my_lottie.json > output.txt
If your compiler support very long strings you can do
const char * my_lottie = "JSON data here";
But be sure to replace all " characters with \".
*/
#include "../../../lvgl.h"
#if LV_BUILD_EXAMPLES && LV_USE_LOTTIE
const uint8_t lv_example_lottie_approve[] = {
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0x00 /*Close the string*/
};
const size_t lv_example_lottie_approve_size = sizeof(lv_example_lottie_approve);
#endif

1
managed_components/lvgl__lvgl/examples/widgets/lottie/lv_example_lottie_approve.json Normal file
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managed_components/lvgl__lvgl/examples/widgets/lv_example_widgets.h Normal file
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@@ -0,0 +1,182 @@
/**
* @file lv_example_widgets.h
*
*/
#ifndef LV_EXAMPLE_WIDGETS_H
#define LV_EXAMPLE_WIDGETS_H
#ifdef __cplusplus
extern "C" {
#endif
/*********************
* INCLUDES
*********************/
/*********************
* DEFINES
*********************/
/**********************
* TYPEDEFS
**********************/
/**********************
* GLOBAL PROTOTYPES
**********************/
void lv_example_animimg_1(void);
void lv_example_arc_1(void);
void lv_example_arc_2(void);
void lv_example_arc_3(void);
void lv_example_arclabel_1(void);
void lv_example_bar_1(void);
void lv_example_bar_2(void);
void lv_example_bar_3(void);
void lv_example_bar_4(void);
void lv_example_bar_5(void);
void lv_example_bar_6(void);
void lv_example_bar_7(void);
void lv_example_button_1(void);
void lv_example_button_2(void);
void lv_example_button_3(void);
void lv_example_buttonmatrix_1(void);
void lv_example_buttonmatrix_2(void);
void lv_example_buttonmatrix_3(void);
void lv_example_calendar_1(void);
void lv_example_calendar_2(void);
void lv_example_canvas_1(void);
void lv_example_canvas_2(void);
void lv_example_canvas_3(void);
void lv_example_canvas_4(void);
void lv_example_canvas_5(void);
void lv_example_canvas_6(void);
void lv_example_canvas_7(void);
void lv_example_canvas_8(void);
void lv_example_canvas_9(void);
void lv_example_canvas_10(void);
void lv_example_canvas_11(void);
void lv_example_canvas_12(void);
void lv_example_chart_1(void);
void lv_example_chart_2(void);
void lv_example_chart_3(void);
void lv_example_chart_4(void);
void lv_example_chart_5(void);
void lv_example_chart_6(void);
void lv_example_chart_7(void);
void lv_example_chart_8(void);
void lv_example_checkbox_1(void);
void lv_example_checkbox_2(void);
void lv_example_dropdown_1(void);
void lv_example_dropdown_2(void);
void lv_example_dropdown_3(void);
void lv_example_image_1(void);
void lv_example_image_2(void);
void lv_example_image_3(void);
void lv_example_image_4(void);
void lv_example_image_5(void);
void lv_example_imagebutton_1(void);
void lv_example_keyboard_1(void);
void lv_example_keyboard_2(void);
void lv_example_keyboard_3(void);
void lv_example_label_1(void);
void lv_example_label_2(void);
void lv_example_label_3(void);
void lv_example_label_4(void);
void lv_example_label_5(void);
void lv_example_label_6(void);
void lv_example_label_7(void);
void lv_example_led_1(void);
void lv_example_line_1(void);
void lv_example_list_1(void);
void lv_example_list_2(void);
void lv_example_lottie_1(void);
void lv_example_lottie_2(void);
void lv_example_menu_1(void);
void lv_example_menu_2(void);
void lv_example_menu_3(void);
void lv_example_menu_4(void);
void lv_example_menu_5(void);
void lv_example_msgbox_1(void);
void lv_example_msgbox_2(void);
void lv_example_msgbox_3(void);
void lv_example_obj_1(void);
void lv_example_obj_2(void);
void lv_example_obj_3(void);
void lv_example_roller_1(void);
void lv_example_roller_2(void);
void lv_example_roller_3(void);
void lv_example_scale_1(void);
void lv_example_scale_2(void);
void lv_example_scale_3(void);
void lv_example_scale_4(void);
void lv_example_scale_5(void);
void lv_example_scale_6(void);
void lv_example_scale_7(void);
void lv_example_scale_8(void);
void lv_example_scale_9(void);
void lv_example_scale_10(void);
void lv_example_scale_11(void);
void lv_example_scale_12(void);
void lv_example_slider_1(void);
void lv_example_slider_2(void);
void lv_example_slider_3(void);
void lv_example_slider_4(void);
void lv_example_span_1(void);
void lv_example_spinbox_1(void);
void lv_example_spinner_1(void);
void lv_example_switch_1(void);
void lv_example_switch_2(void);
void lv_example_table_1(void);
void lv_example_table_2(void);
void lv_example_tabview_1(void);
void lv_example_tabview_2(void);
void lv_example_textarea_1(void);
void lv_example_textarea_2(void);
void lv_example_textarea_3(void);
void lv_example_textarea_4(void);
void lv_example_tileview_1(void);
void lv_example_win_1(void);
/**********************
* MACROS
**********************/
#ifdef __cplusplus
} /*extern "C"*/
#endif
#endif /*LV_EXAMPLE_WIDGETS_H*/

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Simple Menu
-----------
.. lv_example:: widgets/menu/lv_example_menu_1
:language: c
Simple Menu with root btn
-------------------------
.. lv_example:: widgets/menu/lv_example_menu_2
:language: c
Simple Menu with custom header
------------------------------
.. lv_example:: widgets/menu/lv_example_menu_3
:language: c
Simple Menu with floating btn to add new menu page
--------------------------------------------------
.. lv_example:: widgets/menu/lv_example_menu_4
:language: c
Complex Menu
------------
.. lv_example:: widgets/menu/lv_example_menu_5
:language: c

40
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#include "../../lv_examples.h"
#if LV_USE_MENU && LV_BUILD_EXAMPLES
void lv_example_menu_1(void)
{
/*Create a menu object*/
lv_obj_t * menu = lv_menu_create(lv_screen_active());
lv_obj_set_size(menu, lv_display_get_horizontal_resolution(NULL), lv_display_get_vertical_resolution(NULL));
lv_obj_center(menu);
lv_obj_t * cont;
lv_obj_t * label;
/*Create a sub page*/
lv_obj_t * sub_page = lv_menu_page_create(menu, NULL);
cont = lv_menu_cont_create(sub_page);
label = lv_label_create(cont);
lv_label_set_text(label, "Hello, I am hiding here");
/*Create a main page*/
lv_obj_t * main_page = lv_menu_page_create(menu, NULL);
cont = lv_menu_cont_create(main_page);
label = lv_label_create(cont);
lv_label_set_text(label, "Item 1");
cont = lv_menu_cont_create(main_page);
label = lv_label_create(cont);
lv_label_set_text(label, "Item 2");
cont = lv_menu_cont_create(main_page);
label = lv_label_create(cont);
lv_label_set_text(label, "Item 3 (Click me!)");
lv_menu_set_load_page_event(menu, cont, sub_page);
lv_menu_set_page(menu, main_page);
}
#endif

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#include "../../lv_examples.h"
#if LV_USE_MENU && LV_USE_MSGBOX && LV_BUILD_EXAMPLES
static void back_event_handler(lv_event_t * e)
{
lv_obj_t * obj = lv_event_get_target_obj(e);
lv_obj_t * menu = (lv_obj_t *)lv_event_get_user_data(e);
if(lv_menu_back_button_is_root(menu, obj)) {
lv_obj_t * mbox1 = lv_msgbox_create(NULL);
lv_msgbox_add_title(mbox1, "Hello");
lv_msgbox_add_text(mbox1, "Root back btn click.");
lv_msgbox_add_close_button(mbox1);
}
}
void lv_example_menu_2(void)
{
lv_obj_t * menu = lv_menu_create(lv_screen_active());
lv_menu_set_mode_root_back_button(menu, LV_MENU_ROOT_BACK_BUTTON_ENABLED);
lv_obj_add_event_cb(menu, back_event_handler, LV_EVENT_CLICKED, menu);
lv_obj_set_size(menu, lv_display_get_horizontal_resolution(NULL), lv_display_get_vertical_resolution(NULL));
lv_obj_center(menu);
lv_obj_t * cont;
lv_obj_t * label;
/*Create a sub page*/
lv_obj_t * sub_page = lv_menu_page_create(menu, NULL);
cont = lv_menu_cont_create(sub_page);
label = lv_label_create(cont);
lv_label_set_text(label, "Hello, I am hiding here");
/*Create a main page*/
lv_obj_t * main_page = lv_menu_page_create(menu, NULL);
cont = lv_menu_cont_create(main_page);
label = lv_label_create(cont);
lv_label_set_text(label, "Item 1");
cont = lv_menu_cont_create(main_page);
label = lv_label_create(cont);
lv_label_set_text(label, "Item 2");
cont = lv_menu_cont_create(main_page);
label = lv_label_create(cont);
lv_label_set_text(label, "Item 3 (Click me!)");
lv_menu_set_load_page_event(menu, cont, sub_page);
lv_menu_set_page(menu, main_page);
}
#endif

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#include "../../lv_examples.h"
#if LV_USE_MENU && LV_BUILD_EXAMPLES
void lv_example_menu_3(void)
{
/*Create a menu object*/
lv_obj_t * menu = lv_menu_create(lv_screen_active());
lv_obj_set_size(menu, lv_display_get_horizontal_resolution(NULL), lv_display_get_vertical_resolution(NULL));
lv_obj_center(menu);
/*Modify the header*/
lv_obj_t * back_btn = lv_menu_get_main_header_back_button(menu);
lv_obj_t * back_button_label = lv_label_create(back_btn);
lv_label_set_text(back_button_label, "Back");
lv_obj_t * cont;
lv_obj_t * label;
/*Create sub pages*/
lv_obj_t * sub_1_page = lv_menu_page_create(menu, "Page 1");
cont = lv_menu_cont_create(sub_1_page);
label = lv_label_create(cont);
lv_label_set_text(label, "Hello, I am hiding here");
lv_obj_t * sub_2_page = lv_menu_page_create(menu, "Page 2");
cont = lv_menu_cont_create(sub_2_page);
label = lv_label_create(cont);
lv_label_set_text(label, "Hello, I am hiding here");
lv_obj_t * sub_3_page = lv_menu_page_create(menu, "Page 3");
cont = lv_menu_cont_create(sub_3_page);
label = lv_label_create(cont);
lv_label_set_text(label, "Hello, I am hiding here");
/*Create a main page*/
lv_obj_t * main_page = lv_menu_page_create(menu, NULL);
cont = lv_menu_cont_create(main_page);
label = lv_label_create(cont);
lv_label_set_text(label, "Item 1 (Click me!)");
lv_menu_set_load_page_event(menu, cont, sub_1_page);
cont = lv_menu_cont_create(main_page);
label = lv_label_create(cont);
lv_label_set_text(label, "Item 2 (Click me!)");
lv_menu_set_load_page_event(menu, cont, sub_2_page);
cont = lv_menu_cont_create(main_page);
label = lv_label_create(cont);
lv_label_set_text(label, "Item 3 (Click me!)");
lv_menu_set_load_page_event(menu, cont, sub_3_page);
lv_menu_set_page(menu, main_page);
}
#endif

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#include "../../lv_examples.h"
#if LV_USE_MENU && LV_BUILD_EXAMPLES
static uint32_t btn_cnt = 1;
static lv_obj_t * main_page;
static lv_obj_t * menu;
static void float_button_event_cb(lv_event_t * e)
{
LV_UNUSED(e);
btn_cnt++;
lv_obj_t * cont;
lv_obj_t * label;
lv_obj_t * sub_page = lv_menu_page_create(menu, NULL);
cont = lv_menu_cont_create(sub_page);
label = lv_label_create(cont);
lv_label_set_text_fmt(label, "Hello, I am hiding inside %" LV_PRIu32"", btn_cnt);
cont = lv_menu_cont_create(main_page);
label = lv_label_create(cont);
lv_label_set_text_fmt(label, "Item %" LV_PRIu32"", btn_cnt);
lv_menu_set_load_page_event(menu, cont, sub_page);
lv_obj_scroll_to_view_recursive(cont, LV_ANIM_ON);
}
void lv_example_menu_4(void)
{
/*Create a menu object*/
menu = lv_menu_create(lv_screen_active());
lv_obj_set_size(menu, lv_display_get_horizontal_resolution(NULL), lv_display_get_vertical_resolution(NULL));
lv_obj_center(menu);
lv_obj_t * cont;
lv_obj_t * label;
/*Create a sub page*/
lv_obj_t * sub_page = lv_menu_page_create(menu, NULL);
cont = lv_menu_cont_create(sub_page);
label = lv_label_create(cont);
lv_label_set_text(label, "Hello, I am hiding inside the first item");
/*Create a main page*/
main_page = lv_menu_page_create(menu, NULL);
cont = lv_menu_cont_create(main_page);
label = lv_label_create(cont);
lv_label_set_text(label, "Item 1");
lv_menu_set_load_page_event(menu, cont, sub_page);
lv_menu_set_page(menu, main_page);
/*Create floating btn*/
lv_obj_t * float_btn = lv_button_create(lv_screen_active());
lv_obj_set_size(float_btn, 50, 50);
lv_obj_add_flag(float_btn, LV_OBJ_FLAG_FLOATING);
lv_obj_align(float_btn, LV_ALIGN_BOTTOM_RIGHT, -10, -10);
lv_obj_add_event_cb(float_btn, float_button_event_cb, LV_EVENT_CLICKED, menu);
lv_obj_set_style_radius(float_btn, LV_RADIUS_CIRCLE, 0);
lv_obj_set_style_bg_image_src(float_btn, LV_SYMBOL_PLUS, 0);
lv_obj_set_style_text_font(float_btn, lv_theme_get_font_large(float_btn), 0);
}
#endif

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#include "../../lv_examples.h"
#if LV_USE_MENU && LV_USE_MSGBOX && LV_BUILD_EXAMPLES
typedef enum {
LV_MENU_ITEM_BUILDER_VARIANT_1,
LV_MENU_ITEM_BUILDER_VARIANT_2
} lv_menu_builder_variant_t;
static void back_event_handler(lv_event_t * e);
static void switch_handler(lv_event_t * e);
static lv_obj_t * root_page;
static lv_obj_t * create_text(lv_obj_t * parent, const char * icon, const char * txt,
lv_menu_builder_variant_t builder_variant);
static lv_obj_t * create_slider(lv_obj_t * parent,
const char * icon, const char * txt, int32_t min, int32_t max, int32_t val);
static lv_obj_t * create_switch(lv_obj_t * parent,
const char * icon, const char * txt, bool chk);
void lv_example_menu_5(void)
{
lv_obj_t * menu = lv_menu_create(lv_screen_active());
lv_color_t bg_color = lv_obj_get_style_bg_color(menu, LV_PART_MAIN);
if(lv_color_brightness(bg_color) > 127) {
lv_obj_set_style_bg_color(menu, lv_color_darken(lv_obj_get_style_bg_color(menu, LV_PART_MAIN), 10), 0);
}
else {
lv_obj_set_style_bg_color(menu, lv_color_darken(lv_obj_get_style_bg_color(menu, LV_PART_MAIN), 50), 0);
}
lv_menu_set_mode_root_back_button(menu, LV_MENU_ROOT_BACK_BUTTON_ENABLED);
lv_obj_add_event_cb(menu, back_event_handler, LV_EVENT_CLICKED, menu);
lv_obj_set_size(menu, lv_display_get_horizontal_resolution(NULL), lv_display_get_vertical_resolution(NULL));
lv_obj_center(menu);
lv_obj_t * cont;
lv_obj_t * section;
/*Create sub pages*/
lv_obj_t * sub_mechanics_page = lv_menu_page_create(menu, NULL);
lv_obj_set_style_pad_hor(sub_mechanics_page, lv_obj_get_style_pad_left(lv_menu_get_main_header(menu), LV_PART_MAIN), 0);
lv_menu_separator_create(sub_mechanics_page);
section = lv_menu_section_create(sub_mechanics_page);
create_slider(section, LV_SYMBOL_SETTINGS, "Velocity", 0, 150, 120);
create_slider(section, LV_SYMBOL_SETTINGS, "Acceleration", 0, 150, 50);
create_slider(section, LV_SYMBOL_SETTINGS, "Weight limit", 0, 150, 80);
lv_obj_t * sub_sound_page = lv_menu_page_create(menu, NULL);
lv_obj_set_style_pad_hor(sub_sound_page, lv_obj_get_style_pad_left(lv_menu_get_main_header(menu), LV_PART_MAIN), 0);
lv_menu_separator_create(sub_sound_page);
section = lv_menu_section_create(sub_sound_page);
create_switch(section, LV_SYMBOL_AUDIO, "Sound", false);
lv_obj_t * sub_display_page = lv_menu_page_create(menu, NULL);
lv_obj_set_style_pad_hor(sub_display_page, lv_obj_get_style_pad_left(lv_menu_get_main_header(menu), LV_PART_MAIN), 0);
lv_menu_separator_create(sub_display_page);
section = lv_menu_section_create(sub_display_page);
create_slider(section, LV_SYMBOL_SETTINGS, "Brightness", 0, 150, 100);
lv_obj_t * sub_software_info_page = lv_menu_page_create(menu, NULL);
lv_obj_set_style_pad_hor(sub_software_info_page, lv_obj_get_style_pad_left(lv_menu_get_main_header(menu), LV_PART_MAIN),
0);
section = lv_menu_section_create(sub_software_info_page);
create_text(section, NULL, "Version 1.0", LV_MENU_ITEM_BUILDER_VARIANT_1);
lv_obj_t * sub_legal_info_page = lv_menu_page_create(menu, NULL);
lv_obj_set_style_pad_hor(sub_legal_info_page, lv_obj_get_style_pad_left(lv_menu_get_main_header(menu), LV_PART_MAIN),
0);
section = lv_menu_section_create(sub_legal_info_page);
for(uint32_t i = 0; i < 15; i++) {
create_text(section, NULL,
"This is a long long long long long long long long long text, if it is long enough it may scroll.",
LV_MENU_ITEM_BUILDER_VARIANT_1);
}
lv_obj_t * sub_about_page = lv_menu_page_create(menu, NULL);
lv_obj_set_style_pad_hor(sub_about_page, lv_obj_get_style_pad_left(lv_menu_get_main_header(menu), LV_PART_MAIN), 0);
lv_menu_separator_create(sub_about_page);
section = lv_menu_section_create(sub_about_page);
cont = create_text(section, NULL, "Software information", LV_MENU_ITEM_BUILDER_VARIANT_1);
lv_menu_set_load_page_event(menu, cont, sub_software_info_page);
cont = create_text(section, NULL, "Legal information", LV_MENU_ITEM_BUILDER_VARIANT_1);
lv_menu_set_load_page_event(menu, cont, sub_legal_info_page);
lv_obj_t * sub_menu_mode_page = lv_menu_page_create(menu, NULL);
lv_obj_set_style_pad_hor(sub_menu_mode_page, lv_obj_get_style_pad_left(lv_menu_get_main_header(menu), LV_PART_MAIN), 0);
lv_menu_separator_create(sub_menu_mode_page);
section = lv_menu_section_create(sub_menu_mode_page);
cont = create_switch(section, LV_SYMBOL_AUDIO, "Sidebar enable", true);
lv_obj_add_event_cb(lv_obj_get_child(cont, 2), switch_handler, LV_EVENT_VALUE_CHANGED, menu);
/*Create a root page*/
root_page = lv_menu_page_create(menu, "Settings");
lv_obj_set_style_pad_hor(root_page, lv_obj_get_style_pad_left(lv_menu_get_main_header(menu), LV_PART_MAIN), 0);
section = lv_menu_section_create(root_page);
cont = create_text(section, LV_SYMBOL_SETTINGS, "Mechanics", LV_MENU_ITEM_BUILDER_VARIANT_1);
lv_menu_set_load_page_event(menu, cont, sub_mechanics_page);
cont = create_text(section, LV_SYMBOL_AUDIO, "Sound", LV_MENU_ITEM_BUILDER_VARIANT_1);
lv_menu_set_load_page_event(menu, cont, sub_sound_page);
cont = create_text(section, LV_SYMBOL_SETTINGS, "Display", LV_MENU_ITEM_BUILDER_VARIANT_1);
lv_menu_set_load_page_event(menu, cont, sub_display_page);
create_text(root_page, NULL, "Others", LV_MENU_ITEM_BUILDER_VARIANT_1);
section = lv_menu_section_create(root_page);
cont = create_text(section, NULL, "About", LV_MENU_ITEM_BUILDER_VARIANT_1);
lv_menu_set_load_page_event(menu, cont, sub_about_page);
cont = create_text(section, LV_SYMBOL_SETTINGS, "Menu mode", LV_MENU_ITEM_BUILDER_VARIANT_1);
lv_menu_set_load_page_event(menu, cont, sub_menu_mode_page);
lv_menu_set_sidebar_page(menu, root_page);
lv_obj_send_event(lv_obj_get_child(lv_obj_get_child(lv_menu_get_cur_sidebar_page(menu), 0), 0), LV_EVENT_CLICKED,
NULL);
}
static void back_event_handler(lv_event_t * e)
{
lv_obj_t * obj = lv_event_get_target_obj(e);
lv_obj_t * menu = (lv_obj_t *)lv_event_get_user_data(e);
if(lv_menu_back_button_is_root(menu, obj)) {
lv_obj_t * mbox1 = lv_msgbox_create(NULL);
lv_msgbox_add_title(mbox1, "Hello");
lv_msgbox_add_text(mbox1, "Root back btn click.");
lv_msgbox_add_close_button(mbox1);
}
}
static void switch_handler(lv_event_t * e)
{
lv_event_code_t code = lv_event_get_code(e);
lv_obj_t * menu = (lv_obj_t *)lv_event_get_user_data(e);
lv_obj_t * obj = lv_event_get_target_obj(e);
if(code == LV_EVENT_VALUE_CHANGED) {
if(lv_obj_has_state(obj, LV_STATE_CHECKED)) {
lv_menu_set_page(menu, NULL);
lv_menu_set_sidebar_page(menu, root_page);
lv_obj_send_event(lv_obj_get_child(lv_obj_get_child(lv_menu_get_cur_sidebar_page(menu), 0), 0), LV_EVENT_CLICKED,
NULL);
}
else {
lv_menu_set_sidebar_page(menu, NULL);
lv_menu_clear_history(menu); /* Clear history because we will be showing the root page later */
lv_menu_set_page(menu, root_page);
}
}
}
static lv_obj_t * create_text(lv_obj_t * parent, const char * icon, const char * txt,
lv_menu_builder_variant_t builder_variant)
{
lv_obj_t * obj = lv_menu_cont_create(parent);
lv_obj_t * img = NULL;
lv_obj_t * label = NULL;
if(icon) {
img = lv_image_create(obj);
lv_image_set_src(img, icon);
}
if(txt) {
label = lv_label_create(obj);
lv_label_set_text(label, txt);
lv_label_set_long_mode(label, LV_LABEL_LONG_MODE_SCROLL_CIRCULAR);
lv_obj_set_flex_grow(label, 1);
}
if(builder_variant == LV_MENU_ITEM_BUILDER_VARIANT_2 && icon && txt) {
lv_obj_add_flag(img, LV_OBJ_FLAG_FLEX_IN_NEW_TRACK);
lv_obj_swap(img, label);
}
return obj;
}
static lv_obj_t * create_slider(lv_obj_t * parent, const char * icon, const char * txt, int32_t min, int32_t max,
int32_t val)
{
lv_obj_t * obj = create_text(parent, icon, txt, LV_MENU_ITEM_BUILDER_VARIANT_2);
lv_obj_t * slider = lv_slider_create(obj);
lv_obj_set_flex_grow(slider, 1);
lv_slider_set_range(slider, min, max);
lv_slider_set_value(slider, val, LV_ANIM_OFF);
if(icon == NULL) {
lv_obj_add_flag(slider, LV_OBJ_FLAG_FLEX_IN_NEW_TRACK);
}
return obj;
}
static lv_obj_t * create_switch(lv_obj_t * parent, const char * icon, const char * txt, bool chk)
{
lv_obj_t * obj = create_text(parent, icon, txt, LV_MENU_ITEM_BUILDER_VARIANT_1);
lv_obj_t * sw = lv_switch_create(obj);
lv_obj_add_state(sw, chk ? LV_STATE_CHECKED : LV_STATE_DEFAULT);
return obj;
}
#endif

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.. example_heading: Message Box
Simple Message box
------------------
.. lv_example:: widgets/msgbox/lv_example_msgbox_1
:language: c
Scrolling and styled Message box
--------------------------------
.. lv_example:: widgets/msgbox/lv_example_msgbox_2
:language: c
Message box with blurred background
-----------------------------------
.. lv_example:: widgets/msgbox/lv_example_msgbox_3
:language: c

29
managed_components/lvgl__lvgl/examples/widgets/msgbox/lv_example_msgbox_1.c Normal file
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#include "../../lv_examples.h"
#if LV_USE_MSGBOX && LV_BUILD_EXAMPLES
static void event_cb(lv_event_t * e)
{
lv_obj_t * btn = lv_event_get_target_obj(e);
lv_obj_t * label = lv_obj_get_child(btn, 0);
LV_UNUSED(label);
LV_LOG_USER("Button %s clicked", lv_label_get_text(label));
}
void lv_example_msgbox_1(void)
{
lv_obj_t * mbox1 = lv_msgbox_create(NULL);
lv_msgbox_add_title(mbox1, "Hello");
lv_msgbox_add_text(mbox1, "This is a message box with two buttons.");
lv_msgbox_add_close_button(mbox1);
lv_obj_t * btn;
btn = lv_msgbox_add_footer_button(mbox1, "Apply");
lv_obj_add_event_cb(btn, event_cb, LV_EVENT_CLICKED, NULL);
btn = lv_msgbox_add_footer_button(mbox1, "Cancel");
lv_obj_add_event_cb(btn, event_cb, LV_EVENT_CLICKED, NULL);
return;
}
#endif

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managed_components/lvgl__lvgl/examples/widgets/msgbox/lv_example_msgbox_2.c Normal file
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#include "../../lv_examples.h"
#if LV_USE_MSGBOX && LV_BUILD_EXAMPLES
static void minimize_button_event_cb(lv_event_t * e)
{
lv_obj_t * mbox = (lv_obj_t *) lv_event_get_user_data(e);
lv_obj_add_flag(mbox, LV_OBJ_FLAG_HIDDEN);
}
void lv_example_msgbox_2(void)
{
lv_obj_t * setting = lv_msgbox_create(lv_screen_active());
lv_obj_set_style_clip_corner(setting, true, 0);
/* setting fixed size */
lv_obj_set_size(setting, 300, 200);
/* setting's titlebar/header */
lv_msgbox_add_title(setting, "Setting");
lv_obj_t * minimize_button = lv_msgbox_add_header_button(setting, LV_SYMBOL_MINUS);
lv_obj_add_event_cb(minimize_button, minimize_button_event_cb, LV_EVENT_CLICKED, setting);
lv_msgbox_add_close_button(setting);
/* setting's content*/
lv_obj_t * content = lv_msgbox_get_content(setting);
lv_obj_set_flex_flow(content, LV_FLEX_FLOW_COLUMN);
lv_obj_set_flex_align(content, LV_FLEX_ALIGN_START, LV_FLEX_ALIGN_CENTER, LV_FLEX_ALIGN_CENTER);
lv_obj_set_style_pad_right(content, -1, LV_PART_SCROLLBAR);
lv_obj_t * cont_brightness = lv_obj_create(content);
lv_obj_set_size(cont_brightness, lv_pct(100), LV_SIZE_CONTENT);
lv_obj_set_flex_flow(cont_brightness, LV_FLEX_FLOW_COLUMN);
lv_obj_set_flex_align(cont_brightness, LV_FLEX_ALIGN_CENTER, LV_FLEX_ALIGN_START, LV_FLEX_ALIGN_CENTER);
lv_obj_t * lb_brightness = lv_label_create(cont_brightness);
lv_label_set_text(lb_brightness, "Brightness : ");
lv_obj_t * slider_brightness = lv_slider_create(cont_brightness);
lv_obj_set_width(slider_brightness, lv_pct(100));
lv_slider_set_value(slider_brightness, 50, LV_ANIM_OFF);
lv_obj_t * cont_speed = lv_obj_create(content);
lv_obj_set_size(cont_speed, lv_pct(100), LV_SIZE_CONTENT);
lv_obj_set_flex_flow(cont_speed, LV_FLEX_FLOW_COLUMN);
lv_obj_set_flex_align(cont_speed, LV_FLEX_ALIGN_CENTER, LV_FLEX_ALIGN_START, LV_FLEX_ALIGN_CENTER);
lv_obj_t * lb_speed = lv_label_create(cont_speed);
lv_label_set_text(lb_speed, "Speed : ");
lv_obj_t * slider_speed = lv_slider_create(cont_speed);
lv_obj_set_width(slider_speed, lv_pct(100));
lv_slider_set_value(slider_speed, 80, LV_ANIM_OFF);
/* footer */
lv_obj_t * apply_button = lv_msgbox_add_footer_button(setting, "Apply");
lv_obj_set_flex_grow(apply_button, 1);
lv_obj_t * cancel_button = lv_msgbox_add_footer_button(setting, "Cancel");
lv_obj_set_flex_grow(cancel_button, 1);
lv_obj_t * footer = lv_msgbox_get_footer(setting);
lv_obj_set_style_bg_color(footer, lv_palette_main(LV_PALETTE_INDIGO), 0);
lv_obj_set_style_bg_opa(footer, LV_OPA_100, 0);
}
#endif

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managed_components/lvgl__lvgl/examples/widgets/msgbox/lv_example_msgbox_3.c Normal file
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#include "../../lv_examples.h"
#if LV_USE_MSGBOX && LV_BUILD_EXAMPLES
static void dropdown_value_changed_event_cb(lv_event_t * e)
{
lv_obj_t * dropdown = lv_event_get_target_obj(e);
lv_obj_t * msgbox = (lv_obj_t *)lv_event_get_user_data(e);
lv_obj_t * top_layer = lv_layer_top();
uint32_t opt = lv_dropdown_get_selected(dropdown);
/*Blur screen*/
if(opt == 0) {
lv_obj_set_style_blur_radius(msgbox, 0, 0);
lv_obj_set_style_blur_radius(top_layer, 24, 0);
}
/*Blur Message box*/
else {
lv_obj_set_style_blur_radius(msgbox, 24, 0);
lv_obj_set_style_blur_radius(top_layer, 0, 0);
}
}
void lv_example_msgbox_3(void)
{
lv_obj_t * label = lv_label_create(lv_screen_active());
lv_label_set_text(label, "Lorem ipsum dolor sit amet, consectetur adipiscing elit."
" Ut orci mauris, placerat et euismod eu, ullamcorper eget massa. "
"Suspendisse sodales vitae augue ut vestibulum. "
"Nunc fringilla leo ut tellus consectetur tincidunt. "
"Quisque eu tortor semper odio aliquet congue egestas ac massa. "
"Phasellus elit lectus, finibus tempor augue in, elementum lobortis nisl. "
"Donec tristique lorem et tincidunt faucibus.\n\n"
"Lorem ipsum dolor sit amet, consectetur adipiscing elit."
" Ut orci mauris, placerat et euismod eu, ullamcorper eget massa. "
"Suspendisse sodales vitae augue ut vestibulum. "
"Nunc fringilla leo ut tellus consectetur tincidunt. "
"Quisque eu tortor semper odio aliquet congue egestas ac massa. "
"Phasellus elit lectus, finibus tempor augue in, elementum lobortis nisl. "
"Donec tristique lorem et tincidunt faucibus.");
lv_obj_set_width(label, lv_pct(60));
lv_obj_center(label);
lv_obj_set_style_text_color(label, lv_palette_main(LV_PALETTE_BLUE), 0);
lv_obj_t * msgbox1 = lv_msgbox_create(lv_layer_top());
lv_msgbox_add_title(msgbox1, "Setting");
lv_msgbox_add_text(msgbox1, "Hello!\n\n"
"Scroll the text in the background to see how it behaves.");
/*Just a little styling on the message box*/
lv_obj_set_style_bg_opa(msgbox1, LV_OPA_40, 0);
lv_obj_set_style_bg_opa(lv_msgbox_get_header(msgbox1), LV_OPA_50, 0);
lv_obj_set_style_bg_color(lv_msgbox_get_header(msgbox1), lv_color_black(), 0);
lv_obj_set_style_bg_color(msgbox1, lv_color_black(), 0);
lv_obj_set_style_text_color(msgbox1, lv_color_white(), 0);
lv_obj_set_style_text_color(lv_msgbox_get_header(msgbox1), lv_color_white(), 0);
lv_obj_set_style_blur_backdrop(msgbox1, true, 0);
/*A dropdown to select what to blur*/
lv_obj_t * dropdown = lv_dropdown_create(lv_layer_top());
lv_dropdown_set_options(dropdown, "Blur screen\nBlur msgbox");
lv_obj_set_pos(dropdown, 5, 5);
lv_obj_add_event_cb(dropdown, dropdown_value_changed_event_cb, LV_EVENT_VALUE_CHANGED, msgbox1);
/*Also make the list blurred*/
lv_obj_set_style_blur_radius(lv_dropdown_get_list(dropdown), 24, 0);
lv_obj_set_style_blur_backdrop(lv_dropdown_get_list(dropdown), true, 0);
lv_obj_set_style_bg_opa(lv_dropdown_get_list(dropdown), LV_OPA_50, 0);
/*Send a value changed event to set the initial state*/
lv_obj_send_event(dropdown, LV_EVENT_VALUE_CHANGED, NULL);
}
#endif

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