qqmlexpression.h

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#ifndef QQMLEXPRESSION_H
#define QQMLEXPRESSION_H
 
#include <QtQml/qqmlerror.h>
#include <QtQml/qqmlscriptstring.h>
 
#include <QtCore/qobject.h>
#include <QtCore/qvariant.h>
 
QT_BEGIN_NAMESPACE
 
 
class QString;
class QQmlEngine;
class QQmlContext;
class QQmlExpressionPrivate;
class QQmlContextData;
class Q_QML_EXPORT QQmlExpression : public QObject
{
    Q_OBJECT
public:
    QQmlExpression();
    QQmlExpression(QQmlContext *, QObject *, const QString &, QObject * = nullptr);
    explicit QQmlExpression(const QQmlScriptString &, QQmlContext * = nullptr, QObject * = nullptr, QObject * = nullptr);
    ~QQmlExpression() override;
 
    QQmlEngine *engine() const;
    QQmlContext *context() const;
 
    QString expression() const;
    void setExpression(const QString &);
 
    bool notifyOnValueChanged() const;
    void setNotifyOnValueChanged(bool);
 
    QString sourceFile() const;
    int lineNumber() const;
    int columnNumber() const;
    void setSourceLocation(const QString &fileName, int line, int column = 0);
 
    QObject *scopeObject() const;
 
    bool hasError() const;
    void clearError();
    QQmlError error() const;
 
    QVariant evaluate(bool *valueIsUndefined = nullptr);
 
Q_SIGNALS:
    void valueChanged();
 
private:
    QQmlExpression(QQmlExpressionPrivate &dd, QObject *parent);
 
    Q_DISABLE_COPY(QQmlExpression)
    Q_DECLARE_PRIVATE(QQmlExpression)
    friend class QQmlDebugger;
    friend class QQmlContext;
};
 
QT_END_NAMESPACE
 
#endif // QQMLEXPRESSION_H