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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtDeclarative 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 The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/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 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company 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 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
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