initial commit

libraries/lvgl/examples/event/lv_example_event_4.c

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+#include "../lv_examples.h"
+
+#if LV_BUILD_EXAMPLES
+
+static int n = 3;
+static lv_obj_t * label = NULL;
+
+static void timer_cb(lv_timer_t * timer)
+{
+    if(n < 3 || n > 32) {
+        n = 3;
+    }
+    else {
+        static uint32_t old_tick = 0;
+        uint32_t tick = lv_tick_get();
+        if(!old_tick) {
+            old_tick = tick;
+        }
+        if(tick - old_tick > 3000) {
+            n++;
+            lv_label_set_text_fmt(label, "%d sides", n);
+            old_tick = tick;
+        }
+    }
+    lv_obj_invalidate(timer->user_data);
+}
+
+static void event_cb(lv_event_t * e)
+{
+    /*The original target of the event. Can be the buttons or the container*/
+    lv_draw_ctx_t * draw_ctx = lv_event_get_draw_ctx(e);
+    lv_draw_rect_dsc_t draw_dsc;
+    lv_draw_rect_dsc_init(&draw_dsc);
+    draw_dsc.bg_color = lv_palette_main(LV_PALETTE_LIGHT_GREEN);
+    draw_dsc.bg_opa = LV_OPA_COVER;
+    lv_point_t points[32];
+    int i, r = 150;
+    uint32_t tick = lv_tick_get();
+    for(i = 0; i < n; i++) {
+        int angle = i * 360 / n + ((tick % 36000) / 100);
+        lv_coord_t x = 150 + (r * lv_trigo_cos(angle) >> LV_TRIGO_SHIFT), y =
+                           150 + (r * lv_trigo_sin(angle) >> LV_TRIGO_SHIFT);
+        points[i].x = x;
+        points[i].y = y;
+    }
+    lv_draw_polygon(draw_ctx, &draw_dsc, points, n);
+}
+
+/**
+ * Demonstrate event bubbling
+ */
+void lv_example_event_4(void)
+{
+
+    lv_obj_t * cont = lv_obj_create(lv_scr_act());
+    lv_obj_remove_style_all(cont);
+    lv_obj_set_size(cont, 300, 300);
+    label = lv_label_create(cont);
+    lv_label_set_text_fmt(label, "%d sides", n);
+    lv_obj_center(label);
+
+    lv_obj_add_event_cb(cont, event_cb, LV_EVENT_DRAW_MAIN, NULL);
+    lv_timer_create(timer_cb, 17, cont);
+}
+
+#endif