Use Window::Controller to manage MainWindow.

Telegram/SourceFiles/window/window_controller.h

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+/*
+This file is part of Telegram Desktop,
+the official desktop application for the Telegram messaging service.
+
+For license and copyright information please follow this link:
+https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
+*/
+#pragma once
+
+#include "mainwindow.h"
+
+namespace Main {
+class Account;
+} // namespace Main
+
+namespace Window {
+
+class Controller final {
+public:
+	explicit Controller(not_null<Main::Account*> account);
+	~Controller();
+
+	Controller(const Controller &other) = delete;
+	Controller &operator=(const Controller &other) = delete;
+
+	not_null<Main::Account*> account() const {
+		return _account;
+	}
+	not_null<::MainWindow*> widget() {
+		return &_widget;
+	}
+	SessionController *sessionController() const {
+		return _sessionController.get();
+	}
+
+	void firstShow();
+
+	void setupPasscodeLock();
+	void clearPasscodeLock();
+	void setupIntro();
+	void setupMain();
+
+	void showSettings();
+
+	void activate();
+	void reActivate();
+	void updateIsActive(int timeout);
+	void minimize();
+	void close();
+
+	QPoint getPointForCallPanelCenter() const;
+
+	void tempDirDelete(int task);
+
+private:
+	not_null<Main::Account*> _account;
+	::MainWindow _widget;
+	std::unique_ptr<SessionController> _sessionController;
+
+	rpl::lifetime _lifetime;
+
+};
+
+} // namespace Window