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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

1 files changed, 209 insertions, 0 deletions

diff --git a/src/gui/util/qscroller_p.h b/src/gui/util/qscroller_p.h
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+++ b/src/gui/util/qscroller_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** 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, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QSCROLLER_P_H
+#define QSCROLLER_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QObject>
+#include <QPointer>
+#include <QQueue>
+#include <QSet>
+#include <QEasingCurve>
+#include <QElapsedTimer>
+#include <QSizeF>
+#include <QPointF>
+#include <QRectF>
+#include <qscroller.h>
+#include <qscrollerproperties.h>
+#include <private/qscrollerproperties_p.h>
+#include <QAbstractAnimation>
+
+QT_BEGIN_NAMESPACE
+
+#ifndef QT_NO_GESTURES
+class QFlickGestureRecognizer;
+#endif
+
+#ifndef QT_NO_ANIMATION
+class QScrollTimer;
+#endif
+class QScrollerPrivate : public QObject
+{
+    Q_OBJECT
+    Q_DECLARE_PUBLIC(QScroller)
+
+public:
+    QScrollerPrivate(QScroller *q, QObject *target);
+    void init();
+
+    void sendEvent(QObject *o, QEvent *e);
+
+    void setState(QScroller::State s);
+
+    enum ScrollType {
+        ScrollTypeFlick = 0,
+        ScrollTypeScrollTo,
+        ScrollTypeOvershoot
+    };
+
+    struct ScrollSegment {
+        qint64 startTime;
+        qint64 deltaTime;
+        qreal startPos;
+        qreal deltaPos;
+        QEasingCurve curve;
+        qreal stopProgress; // whatever is..
+        qreal stopPos;      // ..reached first
+        ScrollType type;
+    };
+
+    bool pressWhileInactive(const QPointF &position, qint64 timestamp);
+    bool moveWhilePressed(const QPointF &position, qint64 timestamp);
+    bool releaseWhilePressed(const QPointF &position, qint64 timestamp);
+    bool moveWhileDragging(const QPointF &position, qint64 timestamp);
+    bool releaseWhileDragging(const QPointF &position, qint64 timestamp);
+    bool pressWhileScrolling(const QPointF &position, qint64 timestamp);
+
+    void timerTick();
+    void timerEventWhileDragging();
+    void timerEventWhileScrolling();
+
+    bool prepareScrolling(const QPointF &position);
+    void handleDrag(const QPointF &position, qint64 timestamp);
+
+    QPointF realDpi(int screen);
+    QPointF dpi() const;
+    void setDpi(const QPointF &dpi);
+    void setDpiFromWidget(QWidget *widget);
+
+    void updateVelocity(const QPointF &deltaPixelRaw, qint64 deltaTime);
+    void pushSegment(ScrollType type, qreal deltaTime, qreal stopProgress, qreal startPos, qreal deltaPos, qreal stopPos, QEasingCurve::Type curve, Qt::Orientation orientation);
+    void recalcScrollingSegments(bool forceRecalc = false);
+    qreal scrollingSegmentsEndPos(Qt::Orientation orientation) const;
+    bool scrollingSegmentsValid(Qt::Orientation orientation);
+    void createScrollToSegments(qreal v, qreal deltaTime, qreal endPos, Qt::Orientation orientation, ScrollType type);
+    void createScrollingSegments(qreal v, qreal startPos, qreal ppm, Qt::Orientation orientation);
+
+    void setContentPositionHelperDragging(const QPointF &deltaPos);
+    void setContentPositionHelperScrolling();
+
+    qreal nextSnapPos(qreal p, int dir, Qt::Orientation orientation);
+    static qreal nextSegmentPosition(QQueue<ScrollSegment> &segments, qint64 now, qreal oldPos);
+
+    inline int frameRateSkip() const { return properties.d.data()->frameRate; }
+
+    static const char *stateName(QScroller::State state);
+    static const char *inputName(QScroller::Input input);
+
+public slots:
+    void targetDestroyed();
+
+public:
+    // non static
+    QObject *target;
+    QScrollerProperties properties;
+#ifndef QT_NO_GESTURES
+    QFlickGestureRecognizer *recognizer;
+    Qt::GestureType recognizerType;
+#endif
+
+    // scroller state:
+
+    // QPointer<QObject> scrollTarget;
+    QSizeF viewportSize;
+    QRectF contentPosRange;
+    QPointF contentPosition;
+    QPointF overshootPosition; // the number of pixels we are overshooting (before overshootDragResistanceFactor)
+
+    // state
+
+    bool enabled;
+    QScroller::State state;
+    bool firstScroll; // true if we haven't already send a scroll event
+
+    QPointF oldVelocity; // the release velocity of the last drag
+
+    QPointF pressPosition;
+    QPointF lastPosition;
+    qint64  pressTimestamp;
+    qint64  lastTimestamp;
+
+    QPointF dragDistance; // the distance we should move during the next drag timer event
+
+    QQueue<ScrollSegment> xSegments;
+    QQueue<ScrollSegment> ySegments;
+
+    // snap positions
+    QList<qreal> snapPositionsX;
+    qreal snapFirstX;
+    qreal snapIntervalX;
+    QList<qreal> snapPositionsY;
+    qreal snapFirstY;
+    qreal snapIntervalY;
+
+    QPointF pixelPerMeter;
+
+    QElapsedTimer monotonicTimer;
+
+    QPointF releaseVelocity; // the starting velocity of the scrolling state
+#ifndef QT_NO_ANIMATION
+    QScrollTimer *scrollTimer;
+#endif
+
+    QScroller *q_ptr;
+};
+
+
+QT_END_NAMESPACE
+
+#endif // QSCROLLER_P_H
+