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42 #ifndef QQMLABSTRACTEXPRESSION_P_H
43 #define QQMLABSTRACTEXPRESSION_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 <private/qqmlcontext_p.h>
57 #include <private/qfieldlist_p.h>
58 #include <private/qflagpointer_p.h>
62 class Q_QML_PRIVATE_EXPORT QQmlAbstractExpression
65 QQmlAbstractExpression();
66 virtual ~QQmlAbstractExpression();
70 QQmlContextData *context() const;
71 void setContext(QQmlContextData *);
73 virtual void refresh();
77 inline DeleteWatcher(QQmlAbstractExpression *);
78 inline ~DeleteWatcher();
79 inline bool wasDeleted() const;
81 friend class QQmlAbstractExpression;
83 QQmlAbstractExpression **_w;
84 QQmlAbstractExpression *_s;
88 friend class QQmlContext;
89 friend class QQmlContextData;
90 friend class QQmlContextPrivate;
92 QBiPointer<QQmlContextData, DeleteWatcher> m_context;
93 QQmlAbstractExpression **m_prevExpression;
94 QQmlAbstractExpression *m_nextExpression;
97 QQmlAbstractExpression::DeleteWatcher::DeleteWatcher(QQmlAbstractExpression *e)
100 if (e->m_context.isT1()) {
102 _c = e->m_context.asT1();
105 // Another watcher is already registered
106 _w = &e->m_context.asT2()->_s;
110 QQmlAbstractExpression::DeleteWatcher::~DeleteWatcher()
112 Q_ASSERT(*_w == 0 || (*_w == _s && _s->m_context.isT2()));
113 if (*_w && _s->m_context.asT2() == this)
117 bool QQmlAbstractExpression::DeleteWatcher::wasDeleted() const
124 #endif // QQMLABSTRACTEXPRESSION_P_H