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苏雨洛
2025-09-05 13:25:11 +08:00
parent 9ff0a99e7a
commit 3cf1229a85
8911 changed files with 2535396 additions and 0 deletions
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7
managed_components/lvgl__lvgl/examples/widgets/animimg/index.rst Normal file
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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

35
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

182
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_time(&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_time(&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

42
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

34
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

39
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

31
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

76
managed_components/lvgl__lvgl/examples/widgets/bar/lv_example_bar_6.c Normal file
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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 * label;
lv_obj_t * bar_tob = lv_bar_create(lv_screen_active());
lv_obj_set_size(bar_tob, 20, 200);
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, -30);
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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#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

22
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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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#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
Draw Fancy Letter Effects
-------------------------
.. lv_example:: widgets/canvas/lv_example_canvas_10
:language: c
Draw Fancy Letter Effects 2
---------------------------
.. lv_example:: widgets/canvas/lv_example_canvas_11
: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_BUILD_EXAMPLES
#define CANVAS_WIDTH 300
#define CANVAS_HEIGHT 200
static void timer_cb(lv_timer_t * timer)
{
static int16_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_10(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_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 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

41
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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.width = 5;
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_vector_dsc_t * dsc = lv_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_vector_dsc_set_fill_color(dsc, lv_color_make(0x00, 0x80, 0xff));
lv_vector_dsc_add_path(dsc, path);
lv_draw_vector(dsc);
lv_vector_path_delete(path);
lv_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_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);
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);
int32_t 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 - 30;
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, 200, 150);
lv_obj_center(chart);
lv_obj_add_event_cb(chart, event_cb, LV_EVENT_ALL, NULL);
lv_obj_refresh_ext_draw_size(chart);
/*Zoom in a little in X*/
// lv_chart_set_scale_x(chart, 800);
/*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);
uint32_t i;
for(i = 0; i < 10; i++) {
lv_chart_set_next_value(chart, ser1, (int32_t)lv_rand(60, 90));
lv_chart_set_next_value(chart, ser2, (int32_t)lv_rand(10, 40));
}
}
#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_line_dsc_t *)lv_draw_task_get_draw_dsc(draw_task);
lv_draw_triangle_dsc_t tri_dsc;
lv_draw_triangle_dsc_init(&tri_dsc);
tri_dsc.p[0].x = draw_line_dsc->p1.x;
tri_dsc.p[0].y = draw_line_dsc->p1.y;
tri_dsc.p[1].x = draw_line_dsc->p2.x;
tri_dsc.p[1].y = draw_line_dsc->p2.y;
tri_dsc.p[2].x = draw_line_dsc->p1.y < draw_line_dsc->p2.y ? draw_line_dsc->p1.x : draw_line_dsc->p2.x;
tri_dsc.p[2].y = LV_MAX(draw_line_dsc->p1.y, draw_line_dsc->p2.y);
tri_dsc.grad.dir = LV_GRAD_DIR_VER;
int32_t full_h = lv_obj_get_height(obj);
int32_t fract_uppter = (int32_t)(LV_MIN(draw_line_dsc->p1.y, draw_line_dsc->p2.y) - coords.y1) * 255 / full_h;
int32_t fract_lower = (int32_t)(LV_MAX(draw_line_dsc->p1.y, draw_line_dsc->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_uppter);
tri_dsc.grad.stops[0].opa = 255 - fract_uppter;
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)draw_line_dsc->p1.x;
rect_area.x2 = (int32_t)draw_line_dsc->p2.x - 1;
rect_area.y1 = (int32_t)LV_MAX(draw_line_dsc->p1.y, draw_line_dsc->p2.y) - 1;
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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managed_components/lvgl__lvgl/examples/widgets/chart/lv_example_chart_6.c Normal file
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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_chart_set_axis_tick(chart, LV_CHART_AXIS_PRIMARY_Y, 10, 5, 6, 5, true, 40);
// lv_chart_set_axis_tick(chart, LV_CHART_AXIS_PRIMARY_X, 10, 5, 10, 1, true, 30);
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_chart_set_scale_x(chart, 500);
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) {
lv_obj_t * obj = lv_event_get_target_obj(e);
lv_chart_series_t * ser = lv_chart_get_series_next(obj, NULL);
lv_draw_rect_dsc_t * rect_draw_dsc = (lv_draw_rect_dsc_t *)lv_draw_task_get_draw_dsc(draw_task);
uint32_t cnt = lv_chart_get_point_count(obj);
/*Make older value more transparent*/
rect_draw_dsc->bg_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);
rect_draw_dsc->bg_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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managed_components/lvgl__lvgl/examples/widgets/checkbox/index.rst Normal file
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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);
if(code == LV_EVENT_VALUE_CHANGED) {
LV_UNUSED(obj);
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_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 int32_t active_index_1 = 0;
static int32_t active_index_2 = 0;
static void radio_event_handler(lv_event_t * e)
{
int32_t * active_id = (int32_t *)lv_event_get_user_data(e);
lv_obj_t * cont = (lv_obj_t *)lv_event_get_current_target(e);
lv_obj_t * act_cb = lv_event_get_target_obj(e);
lv_obj_t * old_cb = lv_obj_get_child(cont, *active_id);
/*Do nothing if the container was clicked*/
if(act_cb == cont) return;
lv_obj_remove_state(old_cb, LV_STATE_CHECKED); /*Uncheck the previous radio button*/
lv_obj_add_state(act_cb, LV_STATE_CHECKED); /*Check the current radio button*/
*active_id = lv_obj_get_index(act_cb);
LV_LOG_USER("Selected radio buttons: %d, %d", (int)active_index_1, (int)active_index_2);
}
static void radiobutton_create(lv_obj_t * parent, const char * txt)
{
lv_obj_t * obj = lv_checkbox_create(parent);
lv_checkbox_set_text(obj, txt);
lv_obj_add_flag(obj, LV_OBJ_FLAG_EVENT_BUBBLE);
lv_obj_add_style(obj, &style_radio, LV_PART_INDICATOR);
lv_obj_add_style(obj, &style_radio_chk, LV_PART_INDICATOR | LV_STATE_CHECKED);
}
/**
* Checkboxes as radio buttons
*/
void lv_example_checkbox_2(void)
{
/* The idea is to enable `LV_OBJ_FLAG_EVENT_BUBBLE` on checkboxes and process the
* `LV_EVENT_CLICKED` on the container.
* A variable is passed as event user data where the index of the active
* radiobutton is saved */
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);
uint32_t i;
char buf[32];
lv_obj_t * cont1 = lv_obj_create(lv_screen_active());
lv_obj_set_flex_flow(cont1, LV_FLEX_FLOW_COLUMN);
lv_obj_set_size(cont1, lv_pct(40), lv_pct(80));
lv_obj_add_event_cb(cont1, radio_event_handler, LV_EVENT_CLICKED, &active_index_1);
for(i = 0; i < 5; i++) {
lv_snprintf(buf, sizeof(buf), "A %d", (int)i + 1);
radiobutton_create(cont1, buf);
}
/*Make the first checkbox checked*/
lv_obj_add_state(lv_obj_get_child(cont1, 0), LV_STATE_CHECKED);
lv_obj_t * cont2 = lv_obj_create(lv_screen_active());
lv_obj_set_flex_flow(cont2, LV_FLEX_FLOW_COLUMN);
lv_obj_set_size(cont2, lv_pct(40), lv_pct(80));
lv_obj_set_x(cont2, lv_pct(50));
lv_obj_add_event_cb(cont2, radio_event_handler, LV_EVENT_CLICKED, &active_index_2);
for(i = 0; i < 3; i++) {
lv_snprintf(buf, sizeof(buf), "B %d", (int)i + 1);
radiobutton_create(cont2, buf);
}
/*Make the first checkbox checked*/
lv_obj_add_state(lv_obj_get_child(cont2, 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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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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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_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);
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

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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*/
/*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

7
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LED with custom style
---------------------
.. lv_example:: widgets/led/lv_example_led_1
:language: c

26
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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

7
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Simple Line
-----------
.. lv_example:: widgets/line/lv_example_line_1
:language: c

24
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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);
if(code == LV_EVENT_CLICKED) {
LV_UNUSED(obj);
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_background(currentButton);
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_foreground(currentButton);
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

11
managed_components/lvgl__lvgl/examples/widgets/lottie/index.rst Normal file
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@@ -0,0 +1,11 @@
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

43
managed_components/lvgl__lvgl/examples/widgets/lottie/lv_example_lottie_1.c Normal file
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@@ -0,0 +1,43 @@
#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(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*/

41
managed_components/lvgl__lvgl/examples/widgets/lottie/lv_example_lottie_2.c Normal file
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@@ -0,0 +1,41 @@
#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(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*/

32
managed_components/lvgl__lvgl/examples/widgets/lottie/lv_example_lottie_approve.c Normal file
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@@ -0,0 +1,32 @@
/* 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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176
managed_components/lvgl__lvgl/examples/widgets/lv_example_widgets.h Normal file
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@@ -0,0 +1,176 @@
/**
* @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_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_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_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_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_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_EX_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, 0);
if(lv_color_brightness(bg_color) > 127) {
lv_obj_set_style_bg_color(menu, lv_color_darken(lv_obj_get_style_bg_color(menu, 0), 10), 0);
}
else {
lv_obj_set_style_bg_color(menu, lv_color_darken(lv_obj_get_style_bg_color(menu, 0), 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), 0), 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), 0), 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), 0), 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), 0), 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), 0), 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), 0), 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), 0), 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), 0), 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 : 0);
return obj;
}
#endif

14
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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

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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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#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

18
managed_components/lvgl__lvgl/examples/widgets/obj/index.rst Normal file
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Base objects with custom styles
-------------------------------
.. lv_example:: widgets/obj/lv_example_obj_1
:language: c
Make an object draggable
------------------------
.. lv_example:: widgets/obj/lv_example_obj_2
:language: c
Transform object using a 3x3 matrix
-----------------------------------
.. lv_example:: widgets/obj/lv_example_obj_3
:language: c

22
managed_components/lvgl__lvgl/examples/widgets/obj/lv_example_obj_1.c Normal file
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#include "../../lv_examples.h"
#if LV_BUILD_EXAMPLES
void lv_example_obj_1(void)
{
lv_obj_t * obj1;
obj1 = lv_obj_create(lv_screen_active());
lv_obj_set_size(obj1, 100, 50);
lv_obj_align(obj1, LV_ALIGN_CENTER, -60, -30);
static lv_style_t style_shadow;
lv_style_init(&style_shadow);
lv_style_set_shadow_width(&style_shadow, 10);
lv_style_set_shadow_spread(&style_shadow, 5);
lv_style_set_shadow_color(&style_shadow, lv_palette_main(LV_PALETTE_BLUE));
lv_obj_t * obj2;
obj2 = lv_obj_create(lv_screen_active());
lv_obj_add_style(obj2, &style_shadow, 0);
lv_obj_align(obj2, LV_ALIGN_CENTER, 60, 30);
}
#endif

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#include "../../lv_examples.h"
#if LV_BUILD_EXAMPLES
static void drag_event_handler(lv_event_t * e)
{
lv_obj_t * obj = lv_event_get_target_obj(e);
lv_indev_t * indev = lv_indev_active();
if(indev == NULL) return;
lv_point_t vect;
lv_indev_get_vect(indev, &vect);
int32_t x = lv_obj_get_x_aligned(obj) + vect.x;
int32_t y = lv_obj_get_y_aligned(obj) + vect.y;
lv_obj_set_pos(obj, x, y);
}
/**
* Make an object draggable.
*/
void lv_example_obj_2(void)
{
lv_obj_t * obj;
obj = lv_obj_create(lv_screen_active());
lv_obj_set_size(obj, 150, 100);
lv_obj_add_event_cb(obj, drag_event_handler, LV_EVENT_PRESSING, NULL);
lv_obj_t * label = lv_label_create(obj);
lv_label_set_text(label, "Drag me");
lv_obj_center(label);
}
#endif

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#include "../../lv_examples.h"
#if LV_BUILD_EXAMPLES
#if LV_DRAW_TRANSFORM_USE_MATRIX
static void timer_cb(lv_timer_t * timer)
{
lv_obj_t * obj = (lv_obj_t *) lv_timer_get_user_data(timer);
static float value = 0.1f;
lv_matrix_t matrix;
lv_matrix_identity(&matrix);
lv_matrix_scale(&matrix, value, 1);
lv_matrix_rotate(&matrix, value * 360);
lv_obj_set_transform(obj, &matrix);
value += 0.01f;
if(value > 2.0f) {
lv_obj_reset_transform(obj);
value = 0.1f;
}
}
void lv_example_obj_3(void)
{
lv_obj_t * obj = lv_obj_create(lv_screen_active());
lv_obj_center(obj);
lv_timer_create(timer_cb, 20, obj);
}
#else
void lv_example_obj_3(void)
{
lv_obj_t * label = lv_label_create(lv_screen_active());
lv_label_set_text_static(label, "LV_DRAW_TRANSFORM_USE_MATRIX is not enabled");
lv_obj_center(label);
}
#endif /*LV_DRAW_TRANSFORM_USE_MATRIX*/
#endif /*LV_BUILD_EXAMPLES*/

19
managed_components/lvgl__lvgl/examples/widgets/roller/index.rst Normal file
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Simple Roller
-------------
.. lv_example:: widgets/roller/lv_example_roller_1
:language: c
Styling the roller
------------------
.. lv_example:: widgets/roller/lv_example_roller_2
:language: c
add fade mask to roller
-----------------------
.. lv_example:: widgets/roller/lv_example_roller_3
:language: c

41
managed_components/lvgl__lvgl/examples/widgets/roller/lv_example_roller_1.c Normal file
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#include "../../lv_examples.h"
#if LV_USE_ROLLER && 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_roller_get_selected_str(obj, buf, sizeof(buf));
LV_LOG_USER("Selected month: %s\n", buf);
}
}
/**
* An infinite roller with the name of the months
*/
void lv_example_roller_1(void)
{
lv_obj_t * roller1 = lv_roller_create(lv_screen_active());
lv_roller_set_options(roller1,
"January\n"
"February\n"
"March\n"
"April\n"
"May\n"
"June\n"
"July\n"
"August\n"
"September\n"
"October\n"
"November\n"
"December",
LV_ROLLER_MODE_INFINITE);
lv_roller_set_visible_row_count(roller1, 4);
lv_obj_center(roller1);
lv_obj_add_event_cb(roller1, event_handler, LV_EVENT_ALL, NULL);
}
#endif

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