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
|
/****************************************************************************
**
** Copyright (C) 2010 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.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "private/qdeclarativebehavior_p.h"
#include "private/qdeclarativeanimation_p.h"
#include "private/qdeclarativetransition_p.h"
#include <qdeclarativecontext.h>
#include <qdeclarativeinfo.h>
#include <qdeclarativeproperty_p.h>
#include <qdeclarativeguard_p.h>
#include <qdeclarativeengine_p.h>
#include <private/qobject_p.h>
QT_BEGIN_NAMESPACE
class QDeclarativeBehaviorPrivate : public QObjectPrivate
{
Q_DECLARE_PUBLIC(QDeclarativeBehavior)
public:
QDeclarativeBehaviorPrivate() : animation(0), enabled(true), finalized(false)
, blockRunningChanged(false) {}
QDeclarativeProperty property;
QVariant currentValue;
QVariant targetValue;
QDeclarativeGuard<QDeclarativeAbstractAnimation> animation;
bool enabled;
bool finalized;
bool blockRunningChanged;
};
/*!
\qmlclass Behavior QDeclarativeBehavior
\since 4.7
\brief The Behavior element allows you to specify a default animation for a property change.
A Behavior defines the default animation to be applied whenever a
particular property value changes.
For example, the following Behavior defines a NumberAnimation to be run
whenever the \l Rectangle's \c width value changes. When the MouseArea
is clicked, the \c width is changed, triggering the behavior's animation:
\snippet doc/src/snippets/declarative/behavior.qml 0
Note that a property cannot have more than one assigned Behavior. To provide
multiple animations within a Behavior, use ParallelAnimation or
SequentialAnimation.
If a \l{QML States}{state change} has a \l Transition that matches the same property as a
Behavior, the \l Transition animation overrides the Behavior for that
state change.
\sa {QML Animation}, {declarative/animation/behaviors}{Behavior example}, QtDeclarative
*/
QDeclarativeBehavior::QDeclarativeBehavior(QObject *parent)
: QObject(*(new QDeclarativeBehaviorPrivate), parent)
{
}
QDeclarativeBehavior::~QDeclarativeBehavior()
{
}
/*!
\qmlproperty Animation Behavior::animation
\default
This property holds the animation to run when the behavior is triggered.
*/
QDeclarativeAbstractAnimation *QDeclarativeBehavior::animation()
{
Q_D(QDeclarativeBehavior);
return d->animation;
}
void QDeclarativeBehavior::setAnimation(QDeclarativeAbstractAnimation *animation)
{
Q_D(QDeclarativeBehavior);
if (d->animation) {
qmlInfo(this) << tr("Cannot change the animation assigned to a Behavior.");
return;
}
d->animation = animation;
if (d->animation) {
d->animation->setDefaultTarget(d->property);
d->animation->setDisableUserControl();
connect(d->animation->qtAnimation(),
SIGNAL(stateChanged(QAbstractAnimation::State,QAbstractAnimation::State)),
this,
SLOT(qtAnimationStateChanged(QAbstractAnimation::State,QAbstractAnimation::State)));
}
}
void QDeclarativeBehavior::qtAnimationStateChanged(QAbstractAnimation::State newState,QAbstractAnimation::State)
{
Q_D(QDeclarativeBehavior);
if (!d->blockRunningChanged)
d->animation->notifyRunningChanged(newState == QAbstractAnimation::Running);
}
/*!
\qmlproperty bool Behavior::enabled
This property holds whether the behavior will be triggered when the tracked
property changes value.
By default a Behavior is enabled.
*/
bool QDeclarativeBehavior::enabled() const
{
Q_D(const QDeclarativeBehavior);
return d->enabled;
}
void QDeclarativeBehavior::setEnabled(bool enabled)
{
Q_D(QDeclarativeBehavior);
if (d->enabled == enabled)
return;
d->enabled = enabled;
emit enabledChanged();
}
void QDeclarativeBehavior::write(const QVariant &value)
{
Q_D(QDeclarativeBehavior);
qmlExecuteDeferred(this);
if (!d->animation || !d->enabled || !d->finalized) {
QDeclarativePropertyPrivate::write(d->property, value, QDeclarativePropertyPrivate::BypassInterceptor | QDeclarativePropertyPrivate::DontRemoveBinding);
d->targetValue = value;
return;
}
if (d->animation->isRunning() && value == d->targetValue)
return;
d->currentValue = d->property.read();
d->targetValue = value;
if (d->animation->qtAnimation()->duration() != -1
&& d->animation->qtAnimation()->state() != QAbstractAnimation::Stopped) {
d->blockRunningChanged = true;
d->animation->qtAnimation()->stop();
}
QDeclarativeStateOperation::ActionList actions;
QDeclarativeAction action;
action.property = d->property;
action.fromValue = d->currentValue;
action.toValue = value;
actions << action;
QList<QDeclarativeProperty> after;
d->animation->transition(actions, after, QDeclarativeAbstractAnimation::Forward);
d->animation->qtAnimation()->start();
d->blockRunningChanged = false;
if (!after.contains(d->property))
QDeclarativePropertyPrivate::write(d->property, value, QDeclarativePropertyPrivate::BypassInterceptor | QDeclarativePropertyPrivate::DontRemoveBinding);
}
void QDeclarativeBehavior::setTarget(const QDeclarativeProperty &property)
{
Q_D(QDeclarativeBehavior);
d->property = property;
d->currentValue = property.read();
if (d->animation)
d->animation->setDefaultTarget(property);
QDeclarativeEnginePrivate *engPriv = QDeclarativeEnginePrivate::get(qmlEngine(this));
engPriv->registerFinalizedParserStatusObject(this, this->metaObject()->indexOfSlot("componentFinalized()"));
}
void QDeclarativeBehavior::componentFinalized()
{
Q_D(QDeclarativeBehavior);
d->finalized = true;
}
QT_END_NAMESPACE
|
