tg_windows5.12.6/Telegram/SourceFiles/editor/controllers/undo_controller.h

/*
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

namespace Editor {

enum class Undo {
	Undo,
	Redo,
};

class UndoController final {
public:
	struct EnableRequest {
		Undo command = Undo::Undo;
		bool enable = true;
	};

	UndoController();

	void setCanPerformChanges(rpl::producer<EnableRequest> &&command);
	void setPerformRequestChanges(rpl::producer<Undo> &&command);

	[[nodiscard]] rpl::producer<EnableRequest> canPerformChanges() const;
	[[nodiscard]] rpl::producer<Undo> performRequestChanges() const;

private:

	rpl::event_stream<Undo> _perform;
	rpl::event_stream<EnableRequest> _enable;

	rpl::lifetime _lifetime;

};

} // namespace Editor