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41 
42 #ifndef QDECLARATIVEEXPRESSION_H
43 #define QDECLARATIVEEXPRESSION_H
44 
45 #include <QtDeclarative/qdeclarativeerror.h>
46 
47 #include <QtCore/qobject.h>
48 #include <QtCore/qvariant.h>
49 
50 QT_BEGIN_HEADER
51 
52 QT_BEGIN_NAMESPACE
53 
54 QT_MODULE(Declarative)
55 
56 class QString;
57 class QDeclarativeRefCount;
58 class QDeclarativeEngine;
59 class QDeclarativeContext;
60 class QDeclarativeExpressionPrivate;
61 class QDeclarativeContextData;
62 class QScriptValue;
63 class Q_DECLARATIVE_EXPORT QDeclarativeExpression : public QObject
64 {
65     Q_OBJECT
66 public:
67     QDeclarativeExpression();
68     QDeclarativeExpression(QDeclarativeContext *, QObject *, const QString &, QObject * = 0);
69     virtual ~QDeclarativeExpression();
70 
71     QDeclarativeEngine *engine() const;
72     QDeclarativeContext *context() const;
73 
74     QString expression() const;
75     void setExpression(const QString &);
76 
77     bool notifyOnValueChanged() const;
78     void setNotifyOnValueChanged(bool);
79 
80     QString sourceFile() const;
81     int lineNumber() const;
82     void setSourceLocation(const QString &fileName, int line);
83 
84     QObject *scopeObject() const;
85 
86     bool hasError() const;
87     void clearError();
88     QDeclarativeError error() const;
89 
90     QVariant evaluate(bool *valueIsUndefined = 0);
91 
92 Q_SIGNALS:
93     void valueChanged();
94 
95 protected:
96     QDeclarativeExpression(QDeclarativeContextData *, QObject *, const QString &,
97                            QDeclarativeExpressionPrivate &dd);
98     QDeclarativeExpression(QDeclarativeContextData *, QObject *, const QScriptValue &,
99                            QDeclarativeExpressionPrivate &dd);
100     QDeclarativeExpression(QDeclarativeContextData *, void *, QDeclarativeRefCount *rc,
101                            QObject *me, const QString &, int, QDeclarativeExpressionPrivate &dd);
102 
103 private:
104     QDeclarativeExpression(QDeclarativeContextData *, QObject *, const QString &);
105 
106     Q_DISABLE_COPY(QDeclarativeExpression)
107     Q_DECLARE_PRIVATE(QDeclarativeExpression)
108     Q_PRIVATE_SLOT(d_func(), void _q_notify())
109     friend class QDeclarativeDebugger;
110     friend class QDeclarativeContext;
111     friend class QDeclarativeVME;
112 };
113 
114 QT_END_NAMESPACE
115 
116 QT_END_HEADER
117 
118 #endif // QDECLARATIVEEXPRESSION_H
119 
120