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39 | |
40 | #ifndef QQMLABSTRACTBINDING_P_H |
41 | #define QQMLABSTRACTBINDING_P_H |
42 | |
43 | // |
44 | // W A R N I N G |
45 | // ------------- |
46 | // |
47 | // This file is not part of the Qt API. It exists purely as an |
48 | // implementation detail. This header file may change from version to |
49 | // version without notice, or even be removed. |
50 | // |
51 | // We mean it. |
52 | // |
53 | |
54 | #include <QtCore/qsharedpointer.h> |
55 | #include <QtCore/qshareddata.h> |
56 | #include <private/qtqmlglobal_p.h> |
57 | #include <private/qqmlproperty_p.h> |
58 | |
59 | QT_BEGIN_NAMESPACE |
60 | |
61 | class QQmlObjectCreator; |
62 | |
63 | class Q_QML_PRIVATE_EXPORT QQmlAbstractBinding |
64 | { |
65 | protected: |
66 | QQmlAbstractBinding(); |
67 | public: |
68 | virtual ~QQmlAbstractBinding(); |
69 | |
70 | typedef QExplicitlySharedDataPointer<QQmlAbstractBinding> Ptr; |
71 | |
72 | virtual QString expression() const; |
73 | |
74 | virtual bool isValueTypeProxy() const; |
75 | |
76 | // Should return the encoded property index for the binding. Should return this value |
77 | // even if the binding is not enabled or added to an object. |
78 | // Encoding is: coreIndex | (valueTypeIndex << 16) |
79 | QQmlPropertyIndex targetPropertyIndex() const { return m_targetIndex; } |
80 | |
81 | // Should return the object for the binding. Should return this object even if the |
82 | // binding is not enabled or added to the object. |
83 | QObject *targetObject() const { return m_target.data(); } |
84 | |
85 | virtual void setEnabled(bool e, QQmlPropertyData::WriteFlags f = QQmlPropertyData::DontRemoveBinding) = 0; |
86 | |
87 | void addToObject(); |
88 | void removeFromObject(); |
89 | |
90 | static void printBindingLoopError(QQmlProperty &prop); |
91 | |
92 | inline QQmlAbstractBinding *nextBinding() const; |
93 | |
94 | inline bool canUseAccessor() const |
95 | { return m_nextBinding.flag2(); } |
96 | |
97 | struct RefCount { |
98 | RefCount() {} |
99 | int refCount = 0; |
100 | void ref() { ++refCount; } |
101 | int deref() { return --refCount; } |
102 | operator int() const { return refCount; } |
103 | }; |
104 | RefCount ref; |
105 | |
106 | protected: |
107 | friend class QQmlData; |
108 | friend class QQmlValueTypeProxyBinding; |
109 | friend class QQmlObjectCreator; |
110 | |
111 | inline void setAddedToObject(bool v); |
112 | inline bool isAddedToObject() const; |
113 | |
114 | inline void setNextBinding(QQmlAbstractBinding *); |
115 | |
116 | QQmlPropertyIndex m_targetIndex; |
117 | |
118 | // Pointer is the target object to which the binding binds |
119 | // flag1 is the updating flag |
120 | // flag2 is the enabled flag |
121 | QFlagPointer<QObject> m_target; |
122 | |
123 | // Pointer to the next binding in the linked list of bindings. |
124 | // flag1 is used for addedToObject |
125 | // flag2 indicates if an accessor is can be used (i.e. there is no interceptor on the target) |
126 | QFlagPointer<QQmlAbstractBinding> m_nextBinding; |
127 | }; |
128 | |
129 | void QQmlAbstractBinding::setAddedToObject(bool v) |
130 | { |
131 | m_nextBinding.setFlagValue(v); |
132 | } |
133 | |
134 | bool QQmlAbstractBinding::isAddedToObject() const |
135 | { |
136 | return m_nextBinding.flag(); |
137 | } |
138 | |
139 | QQmlAbstractBinding *QQmlAbstractBinding::nextBinding() const |
140 | { |
141 | return m_nextBinding.data(); |
142 | } |
143 | |
144 | void QQmlAbstractBinding::setNextBinding(QQmlAbstractBinding *b) |
145 | { |
146 | if (b) |
147 | b->ref.ref(); |
148 | if (m_nextBinding.data() && !m_nextBinding->ref.deref()) |
149 | delete m_nextBinding.data(); |
150 | m_nextBinding = b; |
151 | } |
152 | |
153 | QT_END_NAMESPACE |
154 | |
155 | #endif // QQMLABSTRACTBINDING_P_H |
156 |