qtbase5-dev 5.2.1+dfsg-1ubuntu14.3 / usr / include / qt5 / QtWidgets / qscroller.h

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/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtWidgets module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia.  For licensing terms and
** conditions see http://qt.digia.com/licensing.  For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights.  These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef QSCROLLER_H
#define QSCROLLER_H

#include <QtCore/QObject>
#include <QtCore/QPointF>
#include <QtWidgets/QScrollerProperties>

QT_BEGIN_NAMESPACE


class QWidget;
class QScrollerPrivate;
class QScrollerProperties;
#ifndef QT_NO_GESTURES
class QFlickGestureRecognizer;
class QMouseFlickGestureRecognizer;
#endif

class Q_WIDGETS_EXPORT QScroller : public QObject
{
    Q_OBJECT
    Q_PROPERTY(State state READ state NOTIFY stateChanged)
    Q_PROPERTY(QScrollerProperties scrollerProperties READ scrollerProperties WRITE setScrollerProperties NOTIFY scrollerPropertiesChanged)
    Q_ENUMS(State)

public:
    enum State
    {
        Inactive,
        Pressed,
        Dragging,
        Scrolling
    };

    enum ScrollerGestureType
    {
        TouchGesture,
        LeftMouseButtonGesture,
        RightMouseButtonGesture,
        MiddleMouseButtonGesture
    };

    enum Input
    {
        InputPress = 1,
        InputMove,
        InputRelease
    };

    static bool hasScroller(QObject *target);

    static QScroller *scroller(QObject *target);
    static const QScroller *scroller(const QObject *target);

#ifndef QT_NO_GESTURES
    static Qt::GestureType grabGesture(QObject *target, ScrollerGestureType gestureType = TouchGesture);
    static Qt::GestureType grabbedGesture(QObject *target);
    static void ungrabGesture(QObject *target);
#endif

    static QList<QScroller *> activeScrollers();

    QObject *target() const;

    State state() const;

    bool handleInput(Input input, const QPointF &position, qint64 timestamp = 0);

    void stop();
    QPointF velocity() const;
    QPointF finalPosition() const;
    QPointF pixelPerMeter() const;

    QScrollerProperties scrollerProperties() const;

    void setSnapPositionsX( const QList<qreal> &positions );
    void setSnapPositionsX( qreal first, qreal interval );
    void setSnapPositionsY( const QList<qreal> &positions );
    void setSnapPositionsY( qreal first, qreal interval );

public Q_SLOTS:
    void setScrollerProperties(const QScrollerProperties &prop);
    void scrollTo(const QPointF &pos);
    void scrollTo(const QPointF &pos, int scrollTime);
    void ensureVisible(const QRectF &rect, qreal xmargin, qreal ymargin);
    void ensureVisible(const QRectF &rect, qreal xmargin, qreal ymargin, int scrollTime);
    void resendPrepareEvent();

Q_SIGNALS:
    void stateChanged(QScroller::State newstate);
    void scrollerPropertiesChanged(const QScrollerProperties &);

private:
    QScrollerPrivate *d_ptr;

    QScroller(QObject *target);
    virtual ~QScroller();

    Q_DISABLE_COPY(QScroller)
    Q_DECLARE_PRIVATE(QScroller)

#ifndef QT_NO_GESTURES
    friend class QFlickGestureRecognizer;
#endif
};

QT_END_NAMESPACE

#endif // QSCROLLER_H

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