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+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtDeclarative module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** 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.
+**
+** 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.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QDECLARATIVEFLICKABLE_P_H
+#define QDECLARATIVEFLICKABLE_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 "private/qdeclarativeflickable_p.h"
+
+#include "private/qdeclarativeitem_p.h"
+#include "private/qdeclarativeitemchangelistener_p.h"
+
+#include <qdeclarative.h>
+#include <qdeclarativetimeline_p_p.h>
+#include <qdeclarativeanimation_p_p.h>
+
+#include <qdatetime.h>
+#include "qplatformdefs.h"
+
+QT_BEGIN_NAMESPACE
+
+// Really slow flicks can be annoying.
+#ifndef QML_FLICK_MINVELOCITY
+#define QML_FLICK_MINVELOCITY 175
+#endif
+
+const qreal MinimumFlickVelocity = QML_FLICK_MINVELOCITY;
+
+class QDeclarativeFlickableVisibleArea;
+class QDeclarativeFlickablePrivate : public QDeclarativeItemPrivate, public QDeclarativeItemChangeListener
+{
+ Q_DECLARE_PUBLIC(QDeclarativeFlickable)
+
+public:
+ QDeclarativeFlickablePrivate();
+ void init();
+
+ struct Velocity : public QDeclarativeTimeLineValue
+ {
+ Velocity(QDeclarativeFlickablePrivate *p)
+ : parent(p) {}
+ virtual void setValue(qreal v) {
+ if (v != value()) {
+ QDeclarativeTimeLineValue::setValue(v);
+ parent->updateVelocity();
+ }
+ }
+ QDeclarativeFlickablePrivate *parent;
+ };
+
+ struct AxisData {
+ AxisData(QDeclarativeFlickablePrivate *fp, void (QDeclarativeFlickablePrivate::*func)(qreal))
+ : move(fp, func), viewSize(-1), smoothVelocity(fp), atEnd(false), atBeginning(true)
+ , fixingUp(false), inOvershoot(false), moving(false), flicking(false)
+ {}
+
+ void reset() {
+ velocityBuffer.clear();
+ dragStartOffset = 0;
+ fixingUp = false;
+ inOvershoot = false;
+ }
+
+ void addVelocitySample(qreal v, qreal maxVelocity);
+ void updateVelocity();
+
+ QDeclarativeTimeLineValueProxy<QDeclarativeFlickablePrivate> move;
+ qreal viewSize;
+ qreal pressPos;
+ qreal dragStartOffset;
+ qreal dragMinBound;
+ qreal dragMaxBound;
+ qreal velocity;
+ qreal flickTarget;
+ QDeclarativeFlickablePrivate::Velocity smoothVelocity;
+ QPODVector<qreal,10> velocityBuffer;
+ bool atEnd : 1;
+ bool atBeginning : 1;
+ bool fixingUp : 1;
+ bool inOvershoot : 1;
+ bool moving : 1;
+ bool flicking : 1;
+ };
+
+ void flickX(qreal velocity);
+ void flickY(qreal velocity);
+ virtual void flick(AxisData &data, qreal minExtent, qreal maxExtent, qreal vSize,
+ QDeclarativeTimeLineCallback::Callback fixupCallback, qreal velocity);
+
+ void fixupX();
+ void fixupY();
+ virtual void fixup(AxisData &data, qreal minExtent, qreal maxExtent);
+
+ void updateBeginningEnd();
+
+ bool isOutermostPressDelay() const;
+ void captureDelayedPress(QGraphicsSceneMouseEvent *event);
+ void clearDelayedPress();
+
+ void setRoundedViewportX(qreal x);
+ void setRoundedViewportY(qreal y);
+
+ qreal overShootDistance(qreal size);
+
+ void itemGeometryChanged(QDeclarativeItem *, const QRectF &, const QRectF &);
+
+public:
+ QDeclarativeItem *contentItem;
+
+ AxisData hData;
+ AxisData vData;
+
+ QDeclarativeTimeLine timeline;
+ bool hMoved : 1;
+ bool vMoved : 1;
+ bool stealMouse : 1;
+ bool pressed : 1;
+ bool interactive : 1;
+ bool calcVelocity : 1;
+ QElapsedTimer lastPosTime;
+ QPointF lastPos;
+ QPointF pressPos;
+ QElapsedTimer pressTime;
+ qreal deceleration;
+ qreal maxVelocity;
+ QElapsedTimer velocityTime;
+ QPointF lastFlickablePosition;
+ qreal reportedVelocitySmoothing;
+ QGraphicsSceneMouseEvent *delayedPressEvent;
+ QGraphicsItem *delayedPressTarget;
+ QBasicTimer delayedPressTimer;
+ int pressDelay;
+ int fixupDuration;
+
+ enum FixupMode { Normal, Immediate, ExtentChanged };
+ FixupMode fixupMode;
+
+ static void fixupY_callback(void *);
+ static void fixupX_callback(void *);
+
+ void updateVelocity();
+ int vTime;
+ QDeclarativeTimeLine velocityTimeline;
+ QDeclarativeFlickableVisibleArea *visibleArea;
+ QDeclarativeFlickable::FlickableDirection flickableDirection;
+ QDeclarativeFlickable::BoundsBehavior boundsBehavior;
+
+ void handleMousePressEvent(QGraphicsSceneMouseEvent *);
+ void handleMouseMoveEvent(QGraphicsSceneMouseEvent *);
+ void handleMouseReleaseEvent(QGraphicsSceneMouseEvent *);
+
+ // flickableData property
+ static void data_append(QDeclarativeListProperty<QObject> *, QObject *);
+ static int data_count(QDeclarativeListProperty<QObject> *);
+ static QObject *data_at(QDeclarativeListProperty<QObject> *, int);
+ static void data_clear(QDeclarativeListProperty<QObject> *);
+};
+
+class QDeclarativeFlickableVisibleArea : public QObject
+{
+ Q_OBJECT
+
+ Q_PROPERTY(qreal xPosition READ xPosition NOTIFY xPositionChanged)
+ Q_PROPERTY(qreal yPosition READ yPosition NOTIFY yPositionChanged)
+ Q_PROPERTY(qreal widthRatio READ widthRatio NOTIFY widthRatioChanged)
+ Q_PROPERTY(qreal heightRatio READ heightRatio NOTIFY heightRatioChanged)
+
+public:
+ QDeclarativeFlickableVisibleArea(QDeclarativeFlickable *parent=0);
+
+ qreal xPosition() const;
+ qreal widthRatio() const;
+ qreal yPosition() const;
+ qreal heightRatio() const;
+
+ void updateVisible();
+
+signals:
+ void xPositionChanged(qreal xPosition);
+ void yPositionChanged(qreal yPosition);
+ void widthRatioChanged(qreal widthRatio);
+ void heightRatioChanged(qreal heightRatio);
+
+private:
+ QDeclarativeFlickable *flickable;
+ qreal m_xPosition;
+ qreal m_widthRatio;
+ qreal m_yPosition;
+ qreal m_heightRatio;
+};
+
+QT_END_NAMESPACE
+
+QML_DECLARE_TYPE(QDeclarativeFlickableVisibleArea)
+
+#endif