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Telegram/SourceFiles/editor/scene/scene.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 <base/unique_qptr.h>
+#include <editor/photo_editor_inner_common.h>
+
+#include <QGraphicsScene>
+
+class QGraphicsSceneMouseEvent;
+
+namespace Ui {
+class RpWidget;
+} // namespace Ui
+
+namespace Editor {
+
+class ItemCanvas;
+class NumberedItem;
+
+class Scene final : public QGraphicsScene {
+public:
+	using ItemPtr = std::shared_ptr<NumberedItem>;
+
+	Scene(const QRectF &rect);
+	~Scene();
+	void applyBrush(const QColor &color, float size);
+
+	[[nodiscard]] std::vector<ItemPtr> items(
+		Qt::SortOrder order = Qt::DescendingOrder) const;
+	void addItem(ItemPtr item);
+	void removeItem(not_null<QGraphicsItem*> item);
+	void removeItem(const ItemPtr &item);
+	[[nodiscard]] rpl::producer<> addsItem() const;
+	[[nodiscard]] rpl::producer<> removesItem() const;
+
+	[[nodiscard]] std::shared_ptr<float64> lastZ() const;
+
+	void updateZoom(float64 zoom);
+
+	void cancelDrawing();
+
+	[[nodiscard]] bool hasUndo() const;
+	[[nodiscard]] bool hasRedo() const;
+
+	void performUndo();
+	void performRedo();
+
+	void save(SaveState state);
+	void restore(SaveState state);
+
+	void clearRedoList();
+protected:
+	void mousePressEvent(QGraphicsSceneMouseEvent *event) override;
+	void mouseReleaseEvent(QGraphicsSceneMouseEvent *event) override;
+	void mouseMoveEvent(QGraphicsSceneMouseEvent *event) override;
+private:
+	void removeIf(Fn<bool(const ItemPtr &)> proj);
+	const std::shared_ptr<ItemCanvas> _canvas;
+	const std::shared_ptr<float64> _lastZ;
+
+	std::vector<ItemPtr> _items;
+
+	float64 _lastLineZ = 0.;
+	int _itemNumber = 0;
+
+	rpl::event_stream<> _addsItem, _removesItem;
+	rpl::lifetime _lifetime;
+
+};
+
+} // namespace Editor