Item List small enhancements

Item list: added new signal - nothing_selected (when mouse clicked on empty space), and two new functions - unselect_all() and is_any_selected()

scene/gui/item_list.cpp

@@ -257,6 +257,20 @@ void ItemList::unselect(int p_idx) {
 	}
 	update();
 }
+
+void ItemList::unselect_all() {
+
+	if (items.size() < 1)
+		return;
+
+	for (int i = 0; i < items.size(); i++) {
+
+		items[i].selected = false;
+	}
+
+	update();
+}
+
 bool ItemList::is_selected(int p_idx) const {
 
 	ERR_FAIL_INDEX_V(p_idx, items.size(), false);
@@ -530,6 +544,9 @@ void ItemList::_gui_input(const Ref<InputEvent> &p_event) {
 
 			return;
 		}
+
+		// Since closest is null, more likely we clicked on empty space, so send signal to interested controls. Allows, for example, implement items deselecting.
+		emit_signal("nothing_selected");
 	}
 	if (mb.is_valid() && mb->get_button_index() == BUTTON_WHEEL_UP && mb->is_pressed()) {
 
@@ -1249,6 +1266,15 @@ Vector<int> ItemList::get_selected_items() {
 	return selected;
 }
 
+bool ItemList::is_anything_selected() {
+	for (int i = 0; i < items.size(); i++) {
+		if (items[i].selected)
+			return true;
+	}
+
+	return false;
+}
+
 void ItemList::_set_items(const Array &p_items) {
 
 	ERR_FAIL_COND(p_items.size() % 3);
@@ -1409,6 +1435,7 @@ void ItemList::_bind_methods() {
 	ADD_SIGNAL(MethodInfo("multi_selected", PropertyInfo(Variant::INT, "index"), PropertyInfo(Variant::BOOL, "selected")));
 	ADD_SIGNAL(MethodInfo("item_activated", PropertyInfo(Variant::INT, "index")));
 	ADD_SIGNAL(MethodInfo("rmb_clicked", PropertyInfo(Variant::VECTOR2, "at_position")));
+	ADD_SIGNAL(MethodInfo("nothing_selected"));
 
 	GLOBAL_DEF("gui/timers/incremental_search_max_interval_msec", 2000);
 }

scene/gui/item_list.h

@@ -156,8 +156,10 @@ public:
 
 	void select(int p_idx, bool p_single = true);
 	void unselect(int p_idx);
+	void unselect_all();
 	bool is_selected(int p_idx) const;
 	Vector<int> get_selected_items();
+	bool is_anything_selected();
 
 	void set_current(int p_current);
 	int get_current() const;