fix(canvas) invalidate the image on delete

fixes #2398
lvgl · Aug 9, 2021 · a1b362c · a1b362c
1 parent 3c86d77
commit a1b362c
Showing 1 changed file with 11 additions and 0 deletions.
diff --git a/src/widgets/lv_canvas.c b/src/widgets/lv_canvas.c
@@ -27,12 +27,14 @@
  *  STATIC PROTOTYPES
  **********************/
 static void lv_canvas_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
+static void lv_canvas_destructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
 
 /**********************
  *  STATIC VARIABLES
  **********************/
 const lv_obj_class_t lv_canvas_class = {
     .constructor_cb = lv_canvas_constructor,
+    .destructor_cb = lv_canvas_destructor,
     .instance_size = sizeof(lv_canvas_t),
     .base_class = &lv_img_class
 };
@@ -911,4 +913,13 @@ static void lv_canvas_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj
     LV_TRACE_OBJ_CREATE("finished");
 }
 
+static void lv_canvas_destructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
+{
+    LV_UNUSED(class_p);
+    LV_TRACE_OBJ_CREATE("begin");
+
+    lv_canvas_t * canvas = (lv_canvas_t *)obj;
+    lv_img_cache_invalidate_src(&canvas->dsc);
+}
+
 #endif