qt-creator/share/qtcreator/qml/qmljsdebugger/editor/boundingrecthighlighter.h

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#ifndef BOUNDINGRECTHIGHLIGHTER_H
#define BOUNDINGRECTHIGHLIGHTER_H

#include <QObject>
#include <QWeakPointer>

#include "layeritem.h"

QT_FORWARD_DECLARE_CLASS(QGraphicsItem);
QT_FORWARD_DECLARE_CLASS(QPainter);
QT_FORWARD_DECLARE_CLASS(QWidget);
QT_FORWARD_DECLARE_CLASS(QStyleOptionGraphicsItem);
QT_FORWARD_DECLARE_CLASS(QTimer);

namespace QmlJSDebugger {

class QDeclarativeViewObserver;
class BoundingBox;

class BoundingRectHighlighter : public LayerItem
{
    Q_OBJECT
public:
    explicit BoundingRectHighlighter(QDeclarativeViewObserver *view);
    ~BoundingRectHighlighter();
    void clear();
    void highlight(QList<QGraphicsObject*> items);
    void highlight(QGraphicsObject* item);

private slots:
    void refresh();
    void animTimeout();
    void itemDestroyed(QObject *);

private:
    BoundingBox *boxFor(QGraphicsObject *item) const;
    void highlightAll(bool animate);
    BoundingBox *createBoundingBox(QGraphicsObject *itemToHighlight);
    void removeBoundingBox(BoundingBox *box);
    void freeBoundingBox(BoundingBox *box);

private:
    Q_DISABLE_COPY(BoundingRectHighlighter);

    QDeclarativeViewObserver *m_view;
    QList<BoundingBox* > m_boxes;
    QList<BoundingBox* > m_freeBoxes;
    QTimer *m_animTimer;
    qreal m_animScale;
    int m_animFrame;

};

class BoundingBox : public QObject
{
    Q_OBJECT
public:
    explicit BoundingBox(QGraphicsObject *itemToHighlight, QGraphicsItem *parentItem,
                         QObject *parent = 0);
    ~BoundingBox();
    QWeakPointer<QGraphicsObject> highlightedObject;
    QGraphicsPolygonItem *highlightPolygon;
    QGraphicsPolygonItem *highlightPolygonEdge;

private:
    Q_DISABLE_COPY(BoundingBox);

};

class BoundingBoxPolygonItem : public QGraphicsPolygonItem
{
public:
    explicit BoundingBoxPolygonItem(QGraphicsItem *item);
    int type() const;
};

} // namespace QmlJSDebugger

#endif // BOUNDINGRECTHIGHLIGHTER_H