Update Telegram button added to DialogsWidget/Intro. Three dot menu.

Telegram/SourceFiles/ui/widgets/dropdown_menu.cpp

@@ -44,7 +44,7 @@ DropdownMenu::DropdownMenu(QWidget *parent, const style::DropdownMenu &st) : Inn
 //}
 
 void DropdownMenu::init() {
-	connect(this, SIGNAL(beforeHidden()), this, SLOT(onHidden()));
+	InnerDropdown::setHiddenCallback([this] { hideFinish(); });
 
 	setOwnedWidget(_menu);
 
@@ -216,6 +216,9 @@ void DropdownMenu::childHiding(DropdownMenu *child) {
 
 void DropdownMenu::hideFinish() {
 	_menu->clearSelection();
+	if (_hiddenCallback) {
+		_hiddenCallback();
+	}
 }
 
 // Not ready with submenus yet.

Telegram/SourceFiles/ui/widgets/dropdown_menu.h

@@ -35,6 +35,10 @@ public:
 	QAction *addSeparator();
 	void clearActions();
 
+	void setHiddenCallback(base::lambda_unique<void()> callback) {
+		_hiddenCallback = std_::move(callback);
+	}
+
 	using Actions = Ui::Menu::Actions;
 	Actions &actions();
 
@@ -91,6 +95,7 @@ private:
 	void showMenu(const QPoint &p, DropdownMenu *parent, TriggeredSource source);
 
 	const style::DropdownMenu &_st;
+	base::lambda_unique<void()> _hiddenCallback;
 
 	ChildWidget<Ui::Menu> _menu;
 

Telegram/SourceFiles/ui/widgets/inner_dropdown.cpp

@@ -188,7 +188,9 @@ void InnerDropdown::hideFinished() {
 	_cache = QPixmap();
 	_ignoreShowEvents = false;
 	if (!isHidden()) {
-		emit beforeHidden();
+		if (_hiddenCallback) {
+			_hiddenCallback();
+		}
 		hide();
 	}
 }

Telegram/SourceFiles/ui/widgets/inner_dropdown.h

@@ -49,6 +49,10 @@ public:
 	void showFast();
 	void hideFast();
 
+	void setHiddenCallback(base::lambda_unique<void()> callback) {
+		_hiddenCallback = std_::move(callback);
+	}
+
 	bool isHiding() const {
 		return _hiding && _a_appearance.animating();
 	}
@@ -60,9 +64,6 @@ public:
 	};
 	void hideAnimated(HideOption option = HideOption::Default);
 
-signals:
-	void beforeHidden();
-
 protected:
 	void resizeEvent(QResizeEvent *e) override;
 	void paintEvent(QPaintEvent *e) override;
@@ -102,6 +103,7 @@ private:
 
 	QTimer _hideTimer;
 	bool _ignoreShowEvents = false;
+	base::lambda_unique<void()> _hiddenCallback;
 
 	RectShadow _shadow;
 	ChildWidget<ScrollArea> _scroll;