summaryrefslogtreecommitdiffstats
path: root/src/corelib/animation/qpropertyanimation.cpp
blob: 35d65d0f5452c35b6ac1825e4e665a42a0e09dc6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtCore 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 either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** 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 1.0, 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.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://qt.nokia.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/

/*!
    \class QPropertyAnimation
    \brief The QPropertyAnimation class animates Qt properties
    \since 4.6

    \ingroup animation

    QPropertyAnimation interpolates over \l{Qt's Property System}{Qt
    properties}. As property values are stored in \l{QVariant}s, the
    class inherits QVariantAnimation, and supports animation of the
    same \l{QVariant::Type}{variant types} as its super class.

    A class declaring properties must be a QObject. To make it
    possible to animate a property, it must provide a setter (so that
    QPropertyAnimation can set the property's value). Note that this
    makes it possible to animate many of Qt's widgets. Let's look at
    an example:

    \code
        QPropertyAnimation animation(myWidget, "geometry");
        animation.setDuration(10000);
        animation.setStartValue(QRect(0, 0, 100, 30));
        animation.setEndValue(QRect(250, 250, 100, 30));

        animation.start();
    \endcode

    The property name and the QObject instance of which property
    should be animated are passed to the constructor. You can then
    specify the start and end value of the property. The procedure is
    equal for properties in classes you have implemented
    yourself--just check with QVariantAnimation that your QVariant
    type is supported.

    The QVariantAnimation class description explains how to set up the
    animation in detail. Note, however, that if a start value is not
    set, the property will start at the value it had when the
    QPropertyAnimation instance was created.

    QPropertyAnimation works like a charm on its own. For complex
    animations that, for instance, contain several objects,
    QAnimationGroup is provided. An animation group is an animation
    that can contain other animations, and that can manage when its
    animations are played. Look at QParallelAnimationGroup for an
    example.

    \sa QVariantAnimation, QAnimationGroup, {The Animation Framework}
*/

#include "qpropertyanimation.h"
#include "qanimationgroup.h"
#include "qpropertyanimation_p.h"

#include <QtCore/qmath.h>
#include <QtCore/qmutex.h>
#include <private/qmutexpool_p.h>

#ifndef QT_NO_ANIMATION

QT_BEGIN_NAMESPACE

void QPropertyAnimationPrivate::updateMetaProperty()
{
    if (!target || propertyName.isEmpty())
        return;

    if (!hasMetaProperty && !property.isValid()) {
        const QMetaObject *mo = target->metaObject();
        propertyIndex = mo->indexOfProperty(propertyName);
        if (propertyIndex != -1) {
            hasMetaProperty = true;
            property = mo->property(propertyIndex);
            propertyType = property.userType();
        } else {
            if (!target->dynamicPropertyNames().contains(propertyName))
                qWarning("QPropertyAnimation: you're trying to animate a non-existing property %s of your QObject", propertyName.constData());
        }
    }

    if (property.isValid())
        convertValues(propertyType);
}

void QPropertyAnimationPrivate::updateProperty(const QVariant &newValue)
{
    if (!target || state == QAbstractAnimation::Stopped)
        return;

    if (hasMetaProperty) {
        if (newValue.userType() == propertyType) {
          //no conversion is needed, we directly call the QObject::qt_metacall
          void *data = const_cast<void*>(newValue.constData());
          target->qt_metacall(QMetaObject::WriteProperty, propertyIndex, &data);
        } else {
          property.write(target, newValue);
        }
    } else {
        target->setProperty(propertyName.constData(), newValue);
    }
}

void QPropertyAnimationPrivate::_q_targetDestroyed()
{
    Q_Q(QPropertyAnimation);
    //we stop here so that this animation is removed from the global hash
    q->stop();
    target = 0;
}

/*!
    Construct a QPropertyAnimation object. \a parent is passed to QObject's
    constructor.
*/
QPropertyAnimation::QPropertyAnimation(QObject *parent)
    : QVariantAnimation(*new QPropertyAnimationPrivate, parent)
{
}

/*!
    Construct a QPropertyAnimation object. \a parent is passed to QObject's
    constructor. The animation changes the property \a propertyName on \a
    target. The default duration is 250ms.

    \sa targetObject, propertyName
*/
QPropertyAnimation::QPropertyAnimation(QObject *target, const QByteArray &propertyName, QObject *parent)
    : QVariantAnimation(*new QPropertyAnimationPrivate, parent)
{
    setTargetObject(target);
    setPropertyName(propertyName);
}

/*!
    Destroys the QPropertyAnimation instance.
 */
QPropertyAnimation::~QPropertyAnimation()
{
    stop();
}

/*!
    \property QPropertyAnimation::targetObject
    \brief the target QObject for this animation.

    This property defines the target QObject for this animation.
 */
QObject *QPropertyAnimation::targetObject() const
{
    Q_D(const QPropertyAnimation);
    return d->target;
}

void QPropertyAnimation::setTargetObject(QObject *target)
{
    Q_D(QPropertyAnimation);
    if (d->target == target)
        return;

    if (d->state != QAbstractAnimation::Stopped) {
        qWarning("QPropertyAnimation::setTargetObject: you can't change the target of a running animation");
        return;
    }

    //we need to get notified when the target is destroyed
    if (d->target)
        disconnect(d->target, SIGNAL(destroyed()), this, SLOT(_q_targetDestroyed()));

    if (target)
        connect(target, SIGNAL(destroyed()), SLOT(_q_targetDestroyed()));

    d->target = target;
    d->hasMetaProperty = false;
    d->updateMetaProperty();
}

/*!
    \property QPropertyAnimation::propertyName
    \brief the target property name for this animation

    This property defines the target property name for this animation. The
    property name is required for the animation to operate.
 */
QByteArray QPropertyAnimation::propertyName() const
{
    Q_D(const QPropertyAnimation);
    return d->propertyName;
}

void QPropertyAnimation::setPropertyName(const QByteArray &propertyName)
{
    Q_D(QPropertyAnimation);
    if (d->state != QAbstractAnimation::Stopped) {
        qWarning("QPropertyAnimation::setPropertyName: you can't change the property name of a running animation");
        return;
    }

    d->propertyName = propertyName;
    d->hasMetaProperty = false;
    d->updateMetaProperty();
}


/*!
    \reimp
 */
bool QPropertyAnimation::event(QEvent *event)
{
    return QVariantAnimation::event(event);
}

/*!
    This virtual function is called by QVariantAnimation whenever the current value
    changes. \a value is the new, updated value. It updates the current value
    of the property on the target object.

    \sa currentValue, currentTime
 */
void QPropertyAnimation::updateCurrentValue(const QVariant &value)
{
    Q_D(QPropertyAnimation);
    d->updateProperty(value);
}

/*!
    \reimp

    If the startValue is not defined when the state of the animation changes from Stopped to Running,
    the current property value is used as the initial value for the animation.
*/
void QPropertyAnimation::updateState(QAbstractAnimation::State oldState,
                                     QAbstractAnimation::State newState)
{
    Q_D(QPropertyAnimation);

    if (!d->target) {
        qWarning("QPropertyAnimation::updateState: Changing state of an animation without target");
        return;
    }

    QVariantAnimation::updateState(oldState, newState);

    QPropertyAnimation *animToStop = 0;
    {
        QMutexLocker locker(QMutexPool::globalInstanceGet(&staticMetaObject));
        typedef QPair<QObject *, QByteArray> QPropertyAnimationPair;
        typedef QHash<QPropertyAnimationPair, QPropertyAnimation*> QPropertyAnimationHash;
        static QPropertyAnimationHash hash;
        QPropertyAnimationPair key(d->target, d->propertyName);
        if (newState == Running) {
            d->updateMetaProperty();
            animToStop = hash.value(key, 0);
            hash.insert(key, this);
            // update the default start value
            if (oldState == Stopped) {
                d->setDefaultStartEndValue(d->target->property(d->propertyName.constData()));
                //let's check if we have a start value and an end value
                if (d->direction == Forward && !startValue().isValid() && !d->defaultStartEndValue.isValid())
                    qWarning("QPropertyAnimation::updateState: starting an animation without start value");
                if (d->direction == Backward && !endValue().isValid() && !d->defaultStartEndValue.isValid())
                    qWarning("QPropertyAnimation::updateState: starting an animation without end value");
            }
        } else if (hash.value(key) == this) {
            hash.remove(key);
        }
    }

    //we need to do that after the mutex was unlocked
    if (animToStop) {
        // try to stop the top level group
        QAbstractAnimation *current = animToStop;
        while (current->group() && current->state() != Stopped)
            current = current->group();
        current->stop();
    }
}

#include "moc_qpropertyanimation.cpp"

QT_END_NAMESPACE

#endif //QT_NO_ANIMATION