1
/****************************************************************************
3
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
4
** Contact: http://www.qt-project.org/legal
6
** This file is part of the QtQml module of the Qt Toolkit.
8
** $QT_BEGIN_LICENSE:LGPL$
9
** Commercial License Usage
10
** Licensees holding valid commercial Qt licenses may use this file in
11
** accordance with the commercial license agreement provided with the
12
** Software or, alternatively, in accordance with the terms contained in
13
** a written agreement between you and Digia. For licensing terms and
14
** conditions see http://qt.digia.com/licensing. For further information
15
** use the contact form at http://qt.digia.com/contact-us.
17
** GNU Lesser General Public License Usage
18
** Alternatively, this file may be used under the terms of the GNU Lesser
19
** General Public License version 2.1 as published by the Free Software
20
** Foundation and appearing in the file LICENSE.LGPL included in the
21
** packaging of this file. Please review the following information to
22
** ensure the GNU Lesser General Public License version 2.1 requirements
23
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
25
** In addition, as a special exception, Digia gives you certain additional
26
** rights. These rights are described in the Digia Qt LGPL Exception
27
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
29
** GNU General Public License Usage
30
** Alternatively, this file may be used under the terms of the GNU
31
** General Public License version 3.0 as published by the Free Software
32
** Foundation and appearing in the file LICENSE.GPL included in the
33
** packaging of this file. Please review the following information to
34
** ensure the GNU General Public License version 3.0 requirements will be
35
** met: http://www.gnu.org/copyleft/gpl.html.
40
****************************************************************************/
42
#ifndef QQUICKFLICKABLE_P_P_H
43
#define QQUICKFLICKABLE_P_P_H
49
// This file is not part of the Qt API. It exists purely as an
50
// implementation detail. This header file may change from version to
51
// version without notice, or even be removed.
56
#include "qquickflickable_p.h"
57
#include "qquickitem_p.h"
58
#include "qquickitemchangelistener_p.h"
60
#include <QtQml/qqml.h>
61
#include <QtCore/qdatetime.h>
62
#include "qplatformdefs.h"
64
#include <private/qquicktimeline_p_p.h>
65
#include <private/qquickanimation_p_p.h>
66
#include <private/qquicktransitionmanager_p_p.h>
70
// Really slow flicks can be annoying.
71
const qreal MinimumFlickVelocity = 75.0;
73
class QQuickFlickableVisibleArea;
74
class QQuickTransition;
75
class QQuickFlickableReboundTransition;
77
class Q_AUTOTEST_EXPORT QQuickFlickablePrivate : public QQuickItemPrivate, public QQuickItemChangeListener
79
Q_DECLARE_PUBLIC(QQuickFlickable)
82
static inline QQuickFlickablePrivate *get(QQuickFlickable *o) { return o->d_func(); }
84
QQuickFlickablePrivate();
87
struct Velocity : public QQuickTimeLineValue
89
Velocity(QQuickFlickablePrivate *p)
91
virtual void setValue(qreal v) {
93
QQuickTimeLineValue::setValue(v);
94
parent->updateVelocity();
97
QQuickFlickablePrivate *parent;
101
AxisData(QQuickFlickablePrivate *fp, void (QQuickFlickablePrivate::*func)(qreal))
103
, transitionToBounds(0)
104
, viewSize(-1), startMargin(0), endMargin(0)
107
, continuousFlickVelocity(0), velocityTime(), vTime(0)
108
, smoothVelocity(fp), atEnd(false), atBeginning(true)
109
, transitionToSet(false)
110
, fixingUp(false), inOvershoot(false), moving(false), flicking(false)
111
, dragging(false), extentsChanged(false)
112
, explicitValue(false), minExtentDirty(true), maxExtentDirty(true)
118
velocityBuffer.clear();
124
void markExtentsDirty() {
125
minExtentDirty = true;
126
maxExtentDirty = true;
127
extentsChanged = true;
130
void resetTransitionTo() {
132
transitionToSet = false;
135
void addVelocitySample(qreal v, qreal maxVelocity);
136
void updateVelocity();
138
QQuickTimeLineValueProxy<QQuickFlickablePrivate> move;
139
QQuickFlickableReboundTransition *transitionToBounds;
143
qreal dragStartOffset;
152
qreal continuousFlickVelocity;
153
QElapsedTimer velocityTime;
155
QQuickFlickablePrivate::Velocity smoothVelocity;
156
QPODVector<qreal,10> velocityBuffer;
158
bool atBeginning : 1;
159
bool transitionToSet : 1;
161
bool inOvershoot : 1;
165
bool extentsChanged : 1;
166
bool explicitValue : 1;
167
mutable bool minExtentDirty : 1;
168
mutable bool maxExtentDirty : 1;
171
bool flickX(qreal velocity);
172
bool flickY(qreal velocity);
173
virtual bool flick(AxisData &data, qreal minExtent, qreal maxExtent, qreal vSize,
174
QQuickTimeLineCallback::Callback fixupCallback, qreal velocity);
175
void flickingStarted(bool flickingH, bool flickingV);
179
virtual void fixup(AxisData &data, qreal minExtent, qreal maxExtent);
180
void adjustContentPos(AxisData &data, qreal toPos);
181
void resetTimeline(AxisData &data);
182
void clearTimeline();
184
void updateBeginningEnd();
186
bool isInnermostPressDelay(QQuickItem *item) const;
187
void captureDelayedPress(QQuickItem *item, QMouseEvent *event);
188
void clearDelayedPress();
189
void replayDelayedPress();
191
void setViewportX(qreal x);
192
void setViewportY(qreal y);
194
qreal overShootDistance(qreal size);
196
void itemGeometryChanged(QQuickItem *, const QRectF &, const QRectF &);
198
void draggingStarting();
199
void draggingEnding();
201
bool isViewMoving() const;
204
QQuickItem *contentItem;
209
QQuickTimeLine timeline;
214
bool interactive : 1;
215
bool calcVelocity : 1;
216
bool pixelAligned : 1;
217
bool replayingPressEvent : 1;
220
qint64 lastPressTime;
225
qreal reportedVelocitySmoothing;
226
QMouseEvent *delayedPressEvent;
227
QBasicTimer delayedPressTimer;
232
enum FixupMode { Normal, Immediate, ExtentChanged };
235
static void fixupY_callback(void *);
236
static void fixupX_callback(void *);
238
void updateVelocity();
240
QQuickTimeLine velocityTimeline;
241
QQuickFlickableVisibleArea *visibleArea;
242
QQuickFlickable::FlickableDirection flickableDirection;
243
QQuickFlickable::BoundsBehavior boundsBehavior;
244
QQuickTransition *rebound;
246
void viewportAxisMoved(AxisData &data, qreal minExtent, qreal maxExtent, qreal vSize,
247
QQuickTimeLineCallback::Callback fixupCallback);
249
void handleMousePressEvent(QMouseEvent *);
250
void handleMouseMoveEvent(QMouseEvent *);
251
void handleMouseReleaseEvent(QMouseEvent *);
253
qint64 computeCurrentTime(QInputEvent *event);
255
// flickableData property
256
static void data_append(QQmlListProperty<QObject> *, QObject *);
257
static int data_count(QQmlListProperty<QObject> *);
258
static QObject *data_at(QQmlListProperty<QObject> *, int);
259
static void data_clear(QQmlListProperty<QObject> *);
262
class QQuickFlickableVisibleArea : public QObject
266
Q_PROPERTY(qreal xPosition READ xPosition NOTIFY xPositionChanged)
267
Q_PROPERTY(qreal yPosition READ yPosition NOTIFY yPositionChanged)
268
Q_PROPERTY(qreal widthRatio READ widthRatio NOTIFY widthRatioChanged)
269
Q_PROPERTY(qreal heightRatio READ heightRatio NOTIFY heightRatioChanged)
272
QQuickFlickableVisibleArea(QQuickFlickable *parent=0);
274
qreal xPosition() const;
275
qreal widthRatio() const;
276
qreal yPosition() const;
277
qreal heightRatio() const;
279
void updateVisible();
282
void xPositionChanged(qreal xPosition);
283
void yPositionChanged(qreal yPosition);
284
void widthRatioChanged(qreal widthRatio);
285
void heightRatioChanged(qreal heightRatio);
288
QQuickFlickable *flickable;
297
QML_DECLARE_TYPE(QQuickFlickableVisibleArea)
299
#endif // QQUICKFLICKABLE_P_P_H