QtQuickColouringBook/qdeclarativepincharea.h

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#ifndef QDECLARATIVEPINCHAREA_H
#define QDECLARATIVEPINCHAREA_H

#include <QDeclarativeItem>
#include <QTouchEvent>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

QT_MODULE(Declarative)

class QDeclarativePinch : public QObject
{
    Q_OBJECT

    Q_ENUMS(Axis)
    Q_PROPERTY(QGraphicsObject *target READ target WRITE setTarget RESET resetTarget)
    Q_PROPERTY(qreal minimumScale READ minimumScale WRITE setMinimumScale NOTIFY minimumScaleChanged)
    Q_PROPERTY(qreal maximumScale READ maximumScale WRITE setMaximumScale NOTIFY maximumScaleChanged)
    Q_PROPERTY(qreal minimumRotation READ minimumRotation WRITE setMinimumRotation NOTIFY minimumRotationChanged)
    Q_PROPERTY(qreal maximumRotation READ maximumRotation WRITE setMaximumRotation NOTIFY maximumRotationChanged)
    Q_PROPERTY(Axis dragAxis READ axis WRITE setAxis NOTIFY dragAxisChanged)
    Q_PROPERTY(qreal minimumX READ xmin WRITE setXmin NOTIFY minimumXChanged)
    Q_PROPERTY(qreal maximumX READ xmax WRITE setXmax NOTIFY maximumXChanged)
    Q_PROPERTY(qreal minimumY READ ymin WRITE setYmin NOTIFY minimumYChanged)
    Q_PROPERTY(qreal maximumY READ ymax WRITE setYmax NOTIFY maximumYChanged)
    Q_PROPERTY(bool active READ active NOTIFY activeChanged)

public:
    QDeclarativePinch();

    QGraphicsObject *target() const { return m_target; }
    void setTarget(QGraphicsObject *target) {
        if (target == m_target)
            return;
        m_target = target;
        emit targetChanged();
    }
    void resetTarget() {
        if (!m_target)
            return;
        m_target = 0;
        emit targetChanged();
    }

    qreal minimumScale() const { return m_minScale; }
    void setMinimumScale(qreal s) {
        if (s == m_minScale)
            return;
        m_minScale = s;
        emit minimumScaleChanged();
    }
    qreal maximumScale() const { return m_maxScale; }
    void setMaximumScale(qreal s) {
        if (s == m_maxScale)
            return;
        m_maxScale = s;
        emit maximumScaleChanged();
    }

    qreal minimumRotation() const { return m_minRotation; }
    void setMinimumRotation(qreal r) {
        if (r == m_minRotation)
            return;
        m_minRotation = r;
        emit minimumRotationChanged();
    }
    qreal maximumRotation() const { return m_maxRotation; }
    void setMaximumRotation(qreal r) {
        if (r == m_maxRotation)
            return;
        m_maxRotation = r;
        emit maximumRotationChanged();
    }

    enum Axis { NoDrag=0x00, XAxis=0x01, YAxis=0x02, XandYAxis=0x03 };
    Axis axis() const { return m_axis; }
    void setAxis(Axis a) {
        if (a == m_axis)
            return;
        m_axis = a;
        emit dragAxisChanged();
    }

    qreal xmin() const { return m_xmin; }
    void setXmin(qreal x) {
        if (x == m_xmin)
            return;
        m_xmin = x;
        emit minimumXChanged();
    }
    qreal xmax() const { return m_xmax; }
    void setXmax(qreal x) {
        if (x == m_xmax)
            return;
        m_xmax = x;
        emit maximumXChanged();
    }
    qreal ymin() const { return m_ymin; }
    void setYmin(qreal y) {
        if (y == m_ymin)
            return;
        m_ymin = y;
        emit minimumYChanged();
    }
    qreal ymax() const { return m_ymax; }
    void setYmax(qreal y) {
        if (y == m_ymax)
            return;
        m_ymax = y;
        emit maximumYChanged();
    }

    bool active() const { return m_active; }
    void setActive(bool a) {
        if (a == m_active)
            return;
        m_active = a;
        emit activeChanged();
    }

signals:
    void targetChanged();
    void minimumScaleChanged();
    void maximumScaleChanged();
    void minimumRotationChanged();
    void maximumRotationChanged();
    void dragAxisChanged();
    void minimumXChanged();
    void maximumXChanged();
    void minimumYChanged();
    void maximumYChanged();
    void activeChanged();

private:
    QGraphicsObject *m_target;
    qreal m_minScale;
    qreal m_maxScale;
    qreal m_minRotation;
    qreal m_maxRotation;
    Axis m_axis;
    qreal m_xmin;
    qreal m_xmax;
    qreal m_ymin;
    qreal m_ymax;
    bool m_active;
};

class QDeclarativePinchEvent : public QObject
{
    Q_OBJECT

    Q_PROPERTY(QPointF center READ center)
    Q_PROPERTY(QPointF startCenter READ startCenter)
    Q_PROPERTY(QPointF lastCenter READ lastCenter)
    Q_PROPERTY(qreal scale READ scale)
    Q_PROPERTY(qreal lastScale READ lastScale)
    Q_PROPERTY(qreal angle READ angle)
    Q_PROPERTY(qreal lastAngle READ lastAngle)
    Q_PROPERTY(qreal rotation READ rotation)
    Q_PROPERTY(QPointF point1 READ point1)
    Q_PROPERTY(QPointF startPoint1 READ startPoint1)
    Q_PROPERTY(QPointF point2 READ point2)
    Q_PROPERTY(QPointF startPoint2 READ startPoint2)
    Q_PROPERTY(bool accepted READ accepted WRITE setAccepted)

public:
    QDeclarativePinchEvent()
        : QObject(), m_center(QPointF()), m_scale(0), m_angle(0), m_rotation(0) {}
    QDeclarativePinchEvent(QPointF c, qreal s, qreal a, qreal r)
        : QObject(), m_center(c), m_scale(s), m_angle(a), m_rotation(r) {}

    QPointF center() const { return m_center; }
    QPointF startCenter() const { return m_startCenter; }
    void setStartCenter(QPointF c) { m_startCenter = c; }
    QPointF lastCenter() const { return m_lastCenter; }
    void setLastCenter(QPointF c) { m_lastCenter = c; }
    qreal scale() const { return m_scale; }
    qreal lastScale() const { return m_lastScale; }
    void setLastScale(qreal s) { m_lastScale = s; }
    qreal angle() const { return m_angle; }
    qreal lastAngle() const { return m_lastAngle; }
    void setLastAngle(qreal a) { m_lastAngle = a; }
    qreal rotation() const { return m_rotation; }
    QPointF point1() const { return m_point1; }
    void setPoint1(QPointF p) { m_point1 = p; }
    QPointF startPoint1() const { return m_startPoint1; }
    void setStartPoint1(QPointF p) { m_startPoint1 = p; }
    QPointF point2() const { return m_point2; }
    void setPoint2(QPointF p) { m_point2 = p; }
    QPointF startPoint2() const { return m_startPoint2; }
    void setStartPoint2(QPointF p) { m_startPoint2 = p; }

    bool accepted() const { return m_accepted; }
    void setAccepted(bool a) { m_accepted = a; }

private:
    QPointF m_center;
    QPointF m_startCenter;
    QPointF m_lastCenter;
    qreal m_scale;
    qreal m_lastScale;
    qreal m_angle;
    qreal m_lastAngle;
    qreal m_rotation;
    QPointF m_point1;
    QPointF m_point2;
    QPointF m_startPoint1;
    QPointF m_startPoint2;
    bool m_accepted;
};


class QDeclarativeMouseEvent;
class QDeclarativePinchArea : public QDeclarativeItem
{
    Q_OBJECT

    Q_PROPERTY(bool enabled READ isEnabled WRITE setEnabled NOTIFY enabledChanged)
    Q_PROPERTY(QDeclarativePinch *pinch READ pinch CONSTANT)

public:
    QDeclarativePinchArea(QDeclarativeItem *parent=0);
    ~QDeclarativePinchArea();

    bool isEnabled() const;
    void setEnabled(bool);

    QDeclarativePinch *pinch();

Q_SIGNALS:
    void enabledChanged();
    void pinchStarted(QDeclarativePinchEvent *pinch);
    void pinchChanged(QDeclarativePinchEvent *pinch);
    void pinchFinished(QDeclarativePinchEvent *pinch);

protected:
    void mousePressEvent(QGraphicsSceneMouseEvent *event);
    void mouseReleaseEvent(QGraphicsSceneMouseEvent *event);
    void mouseMoveEvent(QGraphicsSceneMouseEvent *event);
    bool sceneEvent(QEvent *);
    bool sendMouseEvent(QGraphicsSceneMouseEvent *event);
    bool sceneEventFilter(QGraphicsItem *i, QEvent *e);
    bool event(QEvent *);

    virtual void geometryChanged(const QRectF &newGeometry,
                                 const QRectF &oldGeometry);
    virtual QVariant itemChange(GraphicsItemChange change, const QVariant& value);

private:
    void updatePinch();
    void handlePress();
    void handleRelease();

private:
    Q_DISABLE_COPY(QDeclarativePinchArea)

protected:

    bool absorb : 1;
    bool stealMouse : 1;
    bool inPinch : 1;
    bool pinchRejected : 1;
    QDeclarativePinch *pinch_;
    QPointF sceneStartPoint1;
    QPointF sceneStartPoint2;
    QPointF lastPoint1;
    QPointF lastPoint2;
    qreal pinchStartDist;
    qreal pinchStartScale;
    qreal pinchLastScale;
    qreal pinchStartRotation;
    qreal pinchStartAngle;
    qreal pinchLastAngle;
    QPointF sceneStartCenter;
    QPointF pinchStartCenter;
    QPointF sceneLastCenter;
    QPointF pinchStartPos;
    QList<QTouchEvent::TouchPoint> touchPoints;

};

QT_END_NAMESPACE

QML_DECLARE_TYPE(QDeclarativePinch)
QML_DECLARE_TYPE(QDeclarativePinchEvent)
QML_DECLARE_TYPE(QDeclarativePinchArea)

QT_END_HEADER

#endif // QDECLARATIVEPINCHAREA_H