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3 ** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
4 ** Contact: http://www.qt-project.org/
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8 ** $QT_BEGIN_LICENSE:LGPL$
9 ** GNU Lesser General Public License Usage
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21 ** GNU General Public License Usage
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40 ****************************************************************************/
42 #ifndef QQMLBOUNDSIGNAL_P_H
43 #define QQMLBOUNDSIGNAL_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 <QtCore/qmetaobject.h>
58 #include <private/qqmlabstractexpression_p.h>
59 #include <private/qqmljavascriptexpression_p.h>
60 #include <private/qqmlboundsignalexpressionpointer_p.h>
61 #include <private/qqmlnotifier_p.h>
62 #include <private/qflagpointer_p.h>
63 #include <private/qqmlrefcount_p.h>
64 #include <private/qobject_p.h>
68 class Q_QML_PRIVATE_EXPORT QQmlBoundSignalExpression : public QQmlAbstractExpression, public QQmlJavaScriptExpression, public QQmlRefCount
71 QQmlBoundSignalExpression(QQmlContextData *ctxt, QObject *scope, const QByteArray &expression,
72 bool isRewritten, const QString &fileName, int line, int column);
73 QQmlBoundSignalExpression(QQmlContextData *ctxt, QObject *scope, const QString &expression,
74 bool isRewritten, const QString &fileName, int line, int column);
76 // "inherited" from QQmlJavaScriptExpression.
77 static QString expressionIdentifier(QQmlJavaScriptExpression *);
78 static void expressionChanged(QQmlJavaScriptExpression *);
80 // evaluation of a bound signal expression doesn't return any value
81 void evaluate(QObject *secondaryScope = 0);
83 QString sourceFile() const { return m_fileName; }
84 int lineNumber() const { return m_line; }
85 int columnNumber() const { return m_column; }
86 QString expression() const;
88 QQmlEngine *engine() const { return context() ? context()->engine : 0; }
91 ~QQmlBoundSignalExpression();
93 v8::Persistent<v8::Object> m_v8qmlscope;
94 v8::Persistent<v8::Function> m_v8function;
96 //either expressionUtf8 or expression will be used (but not both).
97 //once m_v8function is valid, we clear both expressions, and
98 //extract it from m_v8function if needed.
99 QByteArray m_expressionUtf8;
100 QString m_expression; //only used when expression needs to be rewritten
106 bool m_expressionFunctionValid:1;
107 bool m_expressionFunctionRewritten:1;
110 class Q_QML_PRIVATE_EXPORT QQmlAbstractBoundSignal
113 QQmlAbstractBoundSignal();
114 virtual ~QQmlAbstractBoundSignal();
116 virtual int index() const = 0;
117 virtual QQmlBoundSignalExpression *expression() const = 0;
118 virtual QQmlBoundSignalExpressionPointer setExpression(QQmlBoundSignalExpression *) = 0;
119 virtual QQmlBoundSignalExpressionPointer takeExpression(QQmlBoundSignalExpression *) = 0;
120 virtual QObject *scope() = 0;
121 virtual bool isEvaluating() const = 0;
123 void removeFromObject();
125 void addToObject(QObject *owner);
128 friend class QQmlData;
129 friend class QQmlPropertyPrivate;
130 friend class QQmlEngineDebugService;
131 QQmlAbstractBoundSignal **m_prevSignal;
132 QQmlAbstractBoundSignal *m_nextSignal;
135 class QQmlBoundSignalParameters;
136 class Q_QML_PRIVATE_EXPORT QQmlBoundSignal : public QQmlAbstractBoundSignal,
137 public QQmlNotifierEndpoint
140 QQmlBoundSignal(QObject *scope, int signal, QObject *owner, QQmlEngine *engine);
141 virtual ~QQmlBoundSignal();
145 QQmlBoundSignalExpression *expression() const;
146 QQmlBoundSignalExpressionPointer setExpression(QQmlBoundSignalExpression *);
147 QQmlBoundSignalExpressionPointer takeExpression(QQmlBoundSignalExpression *);
148 QObject *scope() { return *m_scope; }
150 bool isEvaluating() const { return m_scope.flag(); }
153 friend void QQmlBoundSignal_callback(QQmlNotifierEndpoint *, void **);
155 QQmlBoundSignalExpressionPointer m_expression;
156 QQmlBoundSignalParameters *m_params;
157 // We store some flag bits in the following flag pointer.
158 // m_scope:flag1 - m_isEvaluating
159 // m_scope:flag2 - m_paramsValid
160 QFlagPointer<QObject> m_scope;
163 void setIsEvaluating(bool v) { m_scope.setFlagValue(v); }
164 void setParamsValid(bool v) { m_scope.setFlag2Value(v); }
165 bool paramsValid() const { return m_scope.flag2(); }
171 #endif // QQMLBOUNDSIGNAL_P_H