feat(indev): detect double and triple click (closes #6020) (#6187)

examples/event/lv_example_event_draw.c

@@ -0,0 +1,60 @@
+#include "../lv_examples.h"
+
+#if LV_BUILD_EXAMPLES
+
+static uint32_t size = 0;
+static bool size_dec = false;
+
+static void timer_cb(lv_timer_t * timer)
+{
+    lv_obj_invalidate(lv_timer_get_user_data(timer));
+    if(size_dec) size--;
+    else size++;
+
+    if(size == 50) size_dec = true;
+    else if(size == 0) size_dec = false;
+}
+
+static void event_cb(lv_event_t * e)
+{
+    lv_obj_t * obj = lv_event_get_target(e);
+    lv_draw_task_t * draw_task = lv_event_get_draw_task(e);
+    lv_draw_dsc_base_t * base_dsc = lv_draw_task_get_draw_dsc(draw_task);
+    if(base_dsc->part == LV_PART_MAIN) {
+        lv_draw_rect_dsc_t draw_dsc;
+        lv_draw_rect_dsc_init(&draw_dsc);
+        draw_dsc.bg_color = lv_color_hex(0xffaaaa);
+        draw_dsc.radius = LV_RADIUS_CIRCLE;
+        draw_dsc.border_color = lv_color_hex(0xff5555);
+        draw_dsc.border_width = 2;
+        draw_dsc.outline_color = lv_color_hex(0xff0000);
+        draw_dsc.outline_pad = 3;
+        draw_dsc.outline_width = 2;
+
+        lv_area_t a;
+        a.x1 = 0;
+        a.y1 = 0;
+        a.x2 = size;
+        a.y2 = size;
+        lv_area_t obj_coords;
+        lv_obj_get_coords(obj, &obj_coords);
+        lv_area_align(&obj_coords, &a, LV_ALIGN_CENTER, 0, 0);
+
+        lv_draw_rect(base_dsc->layer, &draw_dsc, &a);
+    }
+}
+
+/**
+ * Demonstrate the usage of draw event
+ */
+void lv_example_event_draw(void)
+{
+    lv_obj_t * cont = lv_obj_create(lv_screen_active());
+    lv_obj_set_size(cont, 200, 200);
+    lv_obj_center(cont);
+    lv_obj_add_event_cb(cont, event_cb, LV_EVENT_DRAW_TASK_ADDED, NULL);
+    lv_obj_add_flag(cont, LV_OBJ_FLAG_SEND_DRAW_TASK_EVENTS);
+    lv_timer_create(timer_cb, 30, cont);
+}
+
+#endif