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Telegram/SourceFiles/editor/controllers/undo_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
+
+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