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3 ** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
4 ** Contact: http://www.qt-project.org/
6 ** This file is part of the QtQml module of the Qt Toolkit.
8 ** $QT_BEGIN_LICENSE:LGPL$
9 ** GNU Lesser General Public License Usage
10 ** This file may be used under the terms of the GNU Lesser General Public
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12 ** appearing in the file LICENSE.LGPL included in the packaging of this
13 ** file. Please review the following information to ensure the GNU Lesser
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21 ** GNU General Public License Usage
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23 ** Public License version 3.0 as published by the Free Software Foundation
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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/qqmlglobal_p.h>
65 #include <private/qobject_p.h>
69 class Q_QML_PRIVATE_EXPORT QQmlBoundSignalExpression : public QQmlAbstractExpression, public QQmlJavaScriptExpression, public QQmlRefCount
72 QQmlBoundSignalExpression(QQmlContextData *ctxt, QObject *scope, const QByteArray &expression,
73 bool isRewritten, const QString &fileName, quint16 line, quint16 column);
74 QQmlBoundSignalExpression(QQmlContextData *ctxt, QObject *scope, const QString &expression,
75 bool isRewritten, const QString &fileName, quint16 line, quint16 column);
77 // "inherited" from QQmlJavaScriptExpression.
78 static QString expressionIdentifier(QQmlJavaScriptExpression *);
79 static void expressionChanged(QQmlJavaScriptExpression *);
81 // evaluation of a bound signal expression doesn't return any value
82 void evaluate(QObject *secondaryScope = 0);
84 QString sourceFile() const { return m_fileName; }
85 quint16 lineNumber() const { return m_line; }
86 quint16 columnNumber() const { return m_column; }
87 QString expression() const;
89 QQmlEngine *engine() const { return context() ? context()->engine : 0; }
92 ~QQmlBoundSignalExpression();
94 v8::Persistent<v8::Object> m_v8qmlscope;
95 v8::Persistent<v8::Function> m_v8function;
97 //either expressionUtf8 or expression will be used (but not both).
98 //once m_v8function is valid, we clear both expressions, and
99 //extract it from m_v8function if needed.
100 QByteArray m_expressionUtf8;
101 QString m_expression; //only used when expression needs to be rewritten
107 bool m_expressionFunctionValid:1;
108 bool m_expressionFunctionRewritten:1;
111 class Q_QML_PRIVATE_EXPORT QQmlAbstractBoundSignal
114 QQmlAbstractBoundSignal();
115 virtual ~QQmlAbstractBoundSignal();
117 virtual int index() const = 0;
118 virtual QQmlBoundSignalExpression *expression() const = 0;
119 virtual QQmlBoundSignalExpressionPointer setExpression(QQmlBoundSignalExpression *) = 0;
120 virtual QQmlBoundSignalExpressionPointer takeExpression(QQmlBoundSignalExpression *) = 0;
121 virtual QObject *scope() = 0;
122 virtual bool isEvaluating() const = 0;
124 void removeFromObject();
126 void addToObject(QObject *owner);
129 friend class QQmlData;
130 friend class QQmlPropertyPrivate;
131 friend class QQmlEngineDebugService;
132 QQmlAbstractBoundSignal **m_prevSignal;
133 QQmlAbstractBoundSignal *m_nextSignal;
136 class QQmlBoundSignalParameters;
137 class Q_QML_PRIVATE_EXPORT QQmlBoundSignal : public QQmlAbstractBoundSignal,
138 public QQmlNotifierEndpoint
141 QQmlBoundSignal(QObject *scope, int signal, QObject *owner, QQmlEngine *engine);
142 virtual ~QQmlBoundSignal();
146 QQmlBoundSignalExpression *expression() const;
147 QQmlBoundSignalExpressionPointer setExpression(QQmlBoundSignalExpression *);
148 QQmlBoundSignalExpressionPointer takeExpression(QQmlBoundSignalExpression *);
149 QObject *scope() { return *m_scope; }
151 bool isEvaluating() const { return m_scope.flag(); }
154 friend void QQmlBoundSignal_callback(QQmlNotifierEndpoint *, void **);
156 QQmlBoundSignalExpressionPointer m_expression;
157 QQmlBoundSignalParameters *m_params;
158 // We store some flag bits in the following flag pointer.
159 // m_scope:flag1 - m_isEvaluating
160 // m_scope:flag2 - m_paramsValid
161 QFlagPointer<QObject> m_scope;
164 void setIsEvaluating(bool v) { m_scope.setFlagValue(v); }
165 void setParamsValid(bool v) { m_scope.setFlag2Value(v); }
166 bool paramsValid() const { return m_scope.flag2(); }
172 #endif // QQMLBOUNDSIGNAL_P_H