mirror of
https://github.com/lvgl/lvgl.git
synced 2026-05-10 04:37:55 +08:00
Mutahhar Mustafa Khan
52 lines
1.6 KiB
C
52 lines
1.6 KiB
C
#include "../lv_examples.h"
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#if LV_BUILD_EXAMPLES && LV_USE_FLEX
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static void event_cb(lv_event_t * e)
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{
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/*The original target of the event. Can be the buttons or the container*/
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lv_obj_t * target = lv_event_get_target_obj(e);
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/*The current target is always the container as the event is added to it*/
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lv_obj_t * cont = lv_event_get_current_target_obj(e);
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/*If container was clicked do nothing*/
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if(target == cont) return;
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/*Make the clicked buttons red*/
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lv_obj_set_style_bg_color(target, lv_palette_main(LV_PALETTE_RED), 0);
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}
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/**
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* @title Event bubbling to a parent
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* @brief Handle clicks on child buttons from a single container callback.
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*
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* A 290x200 container uses `LV_FLEX_FLOW_ROW_WRAP` and holds 30 small
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* buttons, each flagged with `LV_OBJ_FLAG_EVENT_BUBBLE`. One
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* `LV_EVENT_CLICKED` callback on the container reads
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* `lv_event_get_target_obj` to identify which button was clicked and paints
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* its background red; clicks on the container itself are ignored.
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*/
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void lv_example_event_bubble(void)
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{
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lv_obj_t * cont = lv_obj_create(lv_screen_active());
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lv_obj_set_size(cont, 290, 200);
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lv_obj_center(cont);
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lv_obj_set_flex_flow(cont, LV_FLEX_FLOW_ROW_WRAP);
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uint32_t i;
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for(i = 0; i < 30; i++) {
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lv_obj_t * btn = lv_button_create(cont);
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lv_obj_set_size(btn, 70, 50);
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lv_obj_add_flag(btn, LV_OBJ_FLAG_EVENT_BUBBLE);
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lv_obj_t * label = lv_label_create(btn);
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lv_label_set_text_fmt(label, "%" LV_PRIu32, i);
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lv_obj_center(label);
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}
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lv_obj_add_event_cb(cont, event_cb, LV_EVENT_CLICKED, NULL);
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}
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#endif
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