File indexing completed on 2024-05-19 16:34:45

 /*
     SPDX-FileCopyrightText: 2021 Vlad Zahorodnii <vlad.zahorodnii@kde.org>
 
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 
 #pragma once
 
 #include "kwineffects.h"
 #include "kwinglobals.h"
 
 #include <QMatrix4x4>
 #include <QObject>
 #include <QVector>
 
 #include <optional>
 
 namespace KWin
 {
 
 class SceneDelegate;
 class Scene;
 
 /**
  * The Item class is the base class for items in the scene.
  */
 class KWIN_EXPORT Item : public QObject
 {
     Q_OBJECT
 
 public:
     explicit Item(Scene *scene, Item *parent = nullptr);
     ~Item() override;
 
     Scene *scene() const;
 
     qreal opacity() const;
     void setOpacity(qreal opacity);
 
     QPointF position() const;
     void setPosition(const QPointF &point);
 
     QSizeF size() const;
     void setSize(const QSizeF &size);
 
     int z() const;
     void setZ(int z);
 
     /**
      * Returns the enclosing rectangle of the item. The rect equals QRect(0, 0, width(), height()).
      */
     QRectF rect() const;
     /**
      * Returns the enclosing rectangle of the item and all of its descendants.
      */
     QRectF boundingRect() const;
 
     virtual QVector<QRectF> shape() const;
     virtual QRegion opaque() const;
 
     /**
      * Returns the visual parent of the item. Note that the visual parent differs from
      * the QObject parent.
      */
     Item *parentItem() const;
     void setParentItem(Item *parent);
     QList<Item *> childItems() const;
     QList<Item *> sortedChildItems() const;
 
     QPointF rootPosition() const;
 
     QMatrix4x4 transform() const;
     void setTransform(const QMatrix4x4 &transform);
 
     /**
      * Maps the given @a region from the item's coordinate system to the scene's coordinate
      * system.
      */
     QRegion mapToGlobal(const QRegion &region) const;
     /**
      * Maps the given @a rect from the item's coordinate system to the scene's coordinate
      * system.
      */
     QRectF mapToGlobal(const QRectF &rect) const;
     /**
      * Maps the given @a rect from the scene's coordinate system to the item's coordinate
      * system.
      */
     QRectF mapFromGlobal(const QRectF &rect) const;
 
     /**
      * Moves this item right before the specified @a sibling in the parent's children list.
      */
     void stackBefore(Item *sibling);
     /**
      * Moves this item right after the specified @a sibling in the parent's children list.
      */
     void stackAfter(Item *sibling);
 
     bool explicitVisible() const;
     bool isVisible() const;
     void setVisible(bool visible);
 
     void scheduleRepaint(const QRectF &region);
     void scheduleRepaint(const QRegion &region);
     void scheduleFrame();
     QRegion repaints(SceneDelegate *delegate) const;
     void resetRepaints(SceneDelegate *delegate);
 
     WindowQuadList quads() const;
     virtual void preprocess();
 
 Q_SIGNALS:
     void childAdded(Item *item);
     /**
      * This signal is emitted when the position of this item has changed.
      */
     void positionChanged();
     /**
      * This signal is emitted when the size of this item has changed.
      */
     void sizeChanged();
 
     /**
      * This signal is emitted when the rectangle that encloses this item and all of its children
      * has changed.
      */
     void boundingRectChanged();
 
 protected:
     virtual WindowQuadList buildQuads() const;
     void discardQuads();
 
 private:
     void addChild(Item *item);
     void removeChild(Item *item);
     void updateBoundingRect();
     void scheduleRepaintInternal(const QRegion &region);
     void markSortedChildItemsDirty();
 
     bool computeEffectiveVisibility() const;
     void updateEffectiveVisibility();
     void removeRepaints(SceneDelegate *delegate);
 
     Scene *m_scene;
     QPointer<Item> m_parentItem;
     QList<Item *> m_childItems;
     QMatrix4x4 m_transform;
     QRectF m_boundingRect;
     QPointF m_position;
     QSizeF m_size = QSize(0, 0);
     qreal m_opacity = 1;
     int m_z = 0;
     bool m_explicitVisible = true;
     bool m_effectiveVisible = true;
     QMap<SceneDelegate *, QRegion> m_repaints;
     mutable std::optional<WindowQuadList> m_quads;
     mutable std::optional<QList<Item *>> m_sortedChildItems;
 };
 
 } // namespace KWin