Allow objects to override bounding-box hit-testing

src/lv_core/lv_obj.c

@@ -2412,12 +2412,14 @@ bool lv_obj_is_focused(const lv_obj_t * obj)
  *------------------*/
 
 /**
- * Hit-test an object given a particular point in screen space.
- * @param obj object to hit-test
+ * Check if a given screen-space point is on an object's coordinates.
+ * 
+ * This method is intended to be used mainly by advanced hit testing algorithms to check
+ * whether the point is even within the object (as an optimization).
+ * @param obj object to check
  * @param point screen-space point
- * @return true if the object is considered under the point
  */
-bool lv_obj_hittest(lv_obj_t * obj, lv_point_t * point) {
+bool lv_obj_is_point_on_coords(lv_obj_t * obj, lv_point_t * point) {
 #if LV_USE_EXT_CLICK_AREA == LV_EXT_CLICK_AREA_TINY
     lv_area_t ext_area;
     ext_area.x1 = obj->coords.x1 - obj->ext_click_pad_hor;
@@ -2439,15 +2441,24 @@ bool lv_obj_hittest(lv_obj_t * obj, lv_point_t * point) {
 #endif
         return false;
     }
+    return true;
+}
+
+/**
+ * Hit-test an object given a particular point in screen space.
+ * @param obj object to hit-test
+ * @param point screen-space point
+ * @return true if the object is considered under the point
+ */
+bool lv_obj_hittest(lv_obj_t * obj, lv_point_t * point) {
     if(obj->adv_hittest) {
         lv_hit_test_info_t hit_info;
         hit_info.point = point;
         hit_info.result = true;
         obj->signal_cb(obj, LV_SIGNAL_HIT_TEST, &hit_info);
-        if(!hit_info.result)
-            return false;
-    }
-    return true;
+        return hit_info.result;
+    } else
+        return lv_obj_is_point_on_coords(obj, point);
 }
 
 /**

src/lv_core/lv_obj.h

@@ -940,6 +940,22 @@ lv_event_cb_t lv_obj_get_event_cb(const lv_obj_t * obj);
  * Other get
  *-----------------*/
 
+/**
+ * Check if a given screen-space point is on an object's coordinates.
+ * 
+ * This method is intended to be used mainly by advanced hit testing algorithms to check
+ * whether the point is even within the object (as an optimization).
+ * @param obj object to check
+ * @param point screen-space point
+ */
+bool lv_obj_is_point_on_coords(lv_obj_t * obj, lv_point_t * point);
+
+/**
+ * Hit-test an object given a particular point in screen space.
+ * @param obj object to hit-test
+ * @param point screen-space point
+ * @return true if the object is considered under the point
+ */
 bool lv_obj_hittest(lv_obj_t * obj, lv_point_t * point);
 
 /**

src/lv_objx/lv_cpicker.c

@@ -900,9 +900,14 @@ static lv_res_t lv_cpicker_signal(lv_obj_t * cpicker, lv_signal_t sign, void * p
 
 static bool lv_cpicker_hit(lv_obj_t * cpicker, const lv_point_t * p)
 {
+    bool is_point_on_coords = lv_obj_is_point_on_coords(cpicker, p);
+    if(!is_point_on_coords)
+        return false;
+    
     lv_cpicker_ext_t * ext = (lv_cpicker_ext_t *)lv_obj_get_ext_attr(cpicker);
     if(ext->type != LV_CPICKER_TYPE_DISC || ext->preview)
         return true;
+    
     const lv_style_t * style_main = lv_cpicker_get_style(cpicker, LV_CPICKER_STYLE_MAIN);
     lv_area_t area_mid;
     lv_area_copy(&area_mid, &cpicker->coords);