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57 lines
1.4 KiB
C
57 lines
1.4 KiB
C
#include "../lv_examples.h"
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#if LV_BUILD_EXAMPLES
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static uint32_t size = 0;
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static bool size_dec = false;
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static void timer_cb(lv_timer_t * timer)
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{
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lv_obj_invalidate(timer->user_data);
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if(size_dec) size--;
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else size++;
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if(size == 50) size_dec = true;
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else if(size == 0) size_dec = false;
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}
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static void event_cb(lv_event_t * e)
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{
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lv_obj_t * obj = lv_event_get_target(e);
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lv_obj_draw_part_dsc_t * dsc = lv_event_get_draw_part_dsc(e);
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if(dsc->class_p == &lv_obj_class && dsc->part == LV_PART_MAIN) {
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lv_draw_rect_dsc_t draw_dsc;
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lv_draw_rect_dsc_init(&draw_dsc);
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draw_dsc.bg_color = lv_color_hex(0xffaaaa);
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draw_dsc.radius = LV_RADIUS_CIRCLE;
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draw_dsc.border_color = lv_color_hex(0xff5555);
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draw_dsc.border_width = 2;
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draw_dsc.outline_color = lv_color_hex(0xff0000);
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draw_dsc.outline_pad = 3;
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draw_dsc.outline_width = 2;
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lv_area_t a;
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a.x1 = 0;
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a.y1 = 0;
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a.x2 = size;
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a.y2 = size;
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lv_area_align(&obj->coords, &a, LV_ALIGN_CENTER, 0, 0);
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lv_draw_rect(dsc->draw_ctx, &draw_dsc, &a);
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}
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}
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/**
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* Demonstrate the usage of draw event
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*/
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void lv_example_event_4(void)
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{
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lv_obj_t * cont = lv_obj_create(lv_scr_act());
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lv_obj_set_size(cont, 200, 200);
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lv_obj_center(cont);
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lv_obj_add_event(cont, event_cb, LV_EVENT_DRAW_PART_END, NULL);
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lv_timer_create(timer_cb, 30, cont);
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}
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#endif
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