1 /**************************************************************************** 2 ** 3 ** Copyright (C) 2015 The Qt Company Ltd. 4 ** Contact: http://www.qt.io/licensing/ 5 ** 6 ** This file is part of the QtDeclarative module of the Qt Toolkit. 7 ** 8 ** $QT_BEGIN_LICENSE:LGPL$ 9 ** Commercial License Usage 10 ** Licensees holding valid commercial Qt licenses may use this file in 11 ** accordance with the commercial license agreement provided with the 12 ** Software or, alternatively, in accordance with the terms contained in 13 ** a written agreement between you and The Qt Company. For licensing terms 14 ** and conditions see http://www.qt.io/terms-conditions. For further 15 ** information use the contact form at http://www.qt.io/contact-us. 16 ** 17 ** GNU Lesser General Public License Usage 18 ** Alternatively, this file may be used under the terms of the GNU Lesser 19 ** General Public License version 2.1 or version 3 as published by the Free 20 ** Software Foundation and appearing in the file LICENSE.LGPLv21 and 21 ** LICENSE.LGPLv3 included in the packaging of this file. Please review the 22 ** following information to ensure the GNU Lesser General Public License 23 ** requirements will be met: https://www.gnu.org/licenses/lgpl.html and 24 ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. 25 ** 26 ** As a special exception, The Qt Company gives you certain additional 27 ** rights. These rights are described in The Qt Company LGPL Exception 28 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. 29 ** 30 ** GNU General Public License Usage 31 ** Alternatively, this file may be used under the terms of the GNU 32 ** General Public License version 3.0 as published by the Free Software 33 ** Foundation and appearing in the file LICENSE.GPL included in the 34 ** packaging of this file. Please review the following information to 35 ** ensure the GNU General Public License version 3.0 requirements will be 36 ** met: http://www.gnu.org/copyleft/gpl.html. 37 ** 38 ** $QT_END_LICENSE$ 39 ** 40 ****************************************************************************/ 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