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
|
/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the QtQml 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 QQMLABSTRACTBINDING_P_H
#define QQMLABSTRACTBINDING_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 <QtCore/qsharedpointer.h>
#include <private/qtqmlglobal_p.h>
#include <private/qqmlproperty_p.h>
#include <private/qpointervaluepair_p.h>
QT_BEGIN_NAMESPACE
class Q_QML_PRIVATE_EXPORT QQmlAbstractBinding
{
public:
struct VTable {
void (*destroy)(QQmlAbstractBinding *);
QString (*expression)(const QQmlAbstractBinding *);
int (*propertyIndex)(const QQmlAbstractBinding *);
QObject *(*object)(const QQmlAbstractBinding *);
void (*setEnabled)(QQmlAbstractBinding *, bool, QQmlPropertyPrivate::WriteFlags);
void (*update)(QQmlAbstractBinding *, QQmlPropertyPrivate::WriteFlags);
void (*retargetBinding)(QQmlAbstractBinding *, QObject *, int);
};
typedef QWeakPointer<QQmlAbstractBinding> Pointer;
enum BindingType { Binding = 0, V4 = 1, V8 = 2, ValueTypeProxy = 3 };
inline BindingType bindingType() const;
// Destroy the binding. Use this instead of calling delete.
// Bindings are free to implement their own memory management, so the delete operator is
// not necessarily safe. The default implementation clears the binding, removes it from
// the object and calls delete.
void destroy() { vtable()->destroy(this); }
QString expression() const { return vtable()->expression(this); }
// Should return the encoded property index for the binding. Should return this value
// even if the binding is not enabled or added to an object.
// Encoding is: coreIndex | (valueTypeIndex << 16)
int propertyIndex() const { return vtable()->propertyIndex(this); }
// Should return the object for the binding. Should return this object even if the
// binding is not enabled or added to the object.
QObject *object() const { return vtable()->object(this); }
void setEnabled(bool e) { setEnabled(e, QQmlPropertyPrivate::DontRemoveBinding); }
void setEnabled(bool e, QQmlPropertyPrivate::WriteFlags f) { vtable()->setEnabled(this, e, f); }
void update() { update(QQmlPropertyPrivate::DontRemoveBinding); }
void update(QQmlPropertyPrivate::WriteFlags f) { vtable()->update(this, f); }
void addToObject();
void removeFromObject();
static inline Pointer getPointer(QQmlAbstractBinding *p);
static void printBindingLoopError(QQmlProperty &prop);
// Default implementation for some VTable functions
template<typename T>
static void default_destroy(QQmlAbstractBinding *);
static QString default_expression(const QQmlAbstractBinding *);
static void default_retargetBinding(QQmlAbstractBinding *, QObject *, int);
protected:
QQmlAbstractBinding(BindingType);
~QQmlAbstractBinding();
void clear();
// Called by QQmlPropertyPrivate to "move" a binding to a different property.
// This is only used for alias properties. The default implementation qFatal()'s
// to ensure that the method is never called for binding types that don't support it.
void retargetBinding(QObject *o, int i) { vtable()->retargetBinding(this, o, i); }
private:
Pointer weakPointer();
friend class QQmlData;
friend class QQmlComponentPrivate;
friend class QQmlValueTypeProxyBinding;
friend class QQmlPropertyPrivate;
friend class QQmlVME;
friend class QtSharedPointer::ExternalRefCount<QQmlAbstractBinding>;
typedef QSharedPointer<QQmlAbstractBinding> SharedPointer;
// To save memory, we also store the rarely used weakPointer() instance in here
// We also use the flag bits:
// m_mePtr.flag1: added to object
QPointerValuePair<QQmlAbstractBinding*, SharedPointer> m_mePtr;
inline void setAddedToObject(bool v);
inline bool isAddedToObject() const;
inline QQmlAbstractBinding *nextBinding() const;
inline void setNextBinding(QQmlAbstractBinding *);
uintptr_t m_nextBindingPtr;
static VTable *vTables[];
inline const VTable *vtable() const { return vTables[bindingType()]; }
};
QQmlAbstractBinding::Pointer
QQmlAbstractBinding::getPointer(QQmlAbstractBinding *p)
{
return p ? p->weakPointer() : Pointer();
}
void QQmlAbstractBinding::setAddedToObject(bool v)
{
m_mePtr.setFlagValue(v);
}
bool QQmlAbstractBinding::isAddedToObject() const
{
return m_mePtr.flag();
}
QQmlAbstractBinding *QQmlAbstractBinding::nextBinding() const
{
return (QQmlAbstractBinding *)(m_nextBindingPtr & ~0x3);
}
void QQmlAbstractBinding::setNextBinding(QQmlAbstractBinding *b)
{
m_nextBindingPtr = uintptr_t(b) | (m_nextBindingPtr & 0x3);
}
QQmlAbstractBinding::BindingType QQmlAbstractBinding::bindingType() const
{
return (BindingType)(m_nextBindingPtr & 0x3);
}
template<typename T>
void QQmlAbstractBinding::default_destroy(QQmlAbstractBinding *This)
{
This->removeFromObject();
This->clear();
delete static_cast<T *>(This);
}
QT_END_NAMESPACE
#endif // QQMLABSTRACTBINDING_P_H
|
