mirror of
https://github.com/lvgl/lvgl.git
synced 2026-05-10 04:37:55 +08:00
Mutahhar Mustafa Khan
45 lines
1.5 KiB
C
45 lines
1.5 KiB
C
#include "../lv_examples.h"
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#if LV_BUILD_EXAMPLES && LV_USE_FLEX
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/**
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* @title Event trickle to children
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* @brief Forward pressed state from a flex container down to its children.
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*
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* A 290x200 container with `LV_FLEX_FLOW_ROW_WRAP` holds nine small
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* sub-containers, each with a numbered label. The container is flagged with
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* `LV_OBJ_FLAG_EVENT_TRICKLE` so its input events reach the children; a
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* single white-on-black style is added to the container for
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* `LV_STATE_PRESSED` and to each sub-container for `LV_STATE_FOCUSED`, so
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* pressing the container flips the whole group to the dark style.
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*/
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void lv_example_event_trickle(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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static lv_style_t style_black;
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lv_style_init(&style_black);
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lv_style_set_text_color(&style_black, lv_color_white());
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lv_style_set_bg_color(&style_black, lv_color_black());
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/*Enable event trickle-down on the container*/
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lv_obj_add_flag(cont, LV_OBJ_FLAG_EVENT_TRICKLE);
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lv_obj_add_style(cont, &style_black, LV_STATE_PRESSED);
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uint32_t i;
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for(i = 0; i < 9; i++) {
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lv_obj_t * subcont = lv_obj_create(cont);
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lv_obj_set_size(subcont, 70, 50);
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lv_obj_t * label = lv_label_create(subcont);
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lv_label_set_text_fmt(label, "%" LV_PRIu32, i);
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/*Add style to the label when clicked*/
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lv_obj_add_style(subcont, &style_black, LV_STATE_FOCUSED);
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}
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}
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#endif
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