qgsexpressionlineedit.h

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/***************************************************************************
   qgsexpressionlineedit.h
    ----------------------
   Date                 : 18.08.2016
   Copyright            : (C) 2016 Nyall Dawson
   Email                : nyall dot dawson at gmail dot com
***************************************************************************
*                                                                         *
*   This program is free software; you can redistribute it and/or modify  *
*   it under the terms of the GNU General Public License as published by  *
*   the Free Software Foundation; either version 2 of the License, or     *
*   (at your option) any later version.                                   *
*                                                                         *
***************************************************************************/

#ifndef QGSEXPRESSIONLINEEDIT_H
#define QGSEXPRESSIONLINEEDIT_H

#include <QWidget>
#include "qgsexpressioncontext.h"
#include "qgsdistancearea.h"

class QgsFilterLineEdit;
class QToolButton;
class QgsDistanceArea;
class QgsExpressionContextGenerator;
class QgsCodeEditorSQL;

class GUI_EXPORT QgsExpressionLineEdit : public QWidget
{
    Q_OBJECT

  public:

    explicit QgsExpressionLineEdit( QWidget *parent = nullptr );

    void setExpressionDialogTitle( const QString& title );

    QString expressionDialogTitle() const { return mExpressionDialogTitle; }

    void setMultiLine( bool multiLine );

    void setGeomCalculator( const QgsDistanceArea &distanceArea );

    void setLayer( QgsVectorLayer* layer );

    QString expression() const;

    bool isValidExpression( QString *expressionError = nullptr ) const;

  signals:

    void expressionChanged( const QString& expression );

  public slots:

    void setExpression( const QString& expression );

  protected:
    void changeEvent( QEvent* event ) override;

  private slots:
    void expressionEdited( const QString& expression );
    void expressionEdited();

    void editExpression();

    void updateLineEditStyle( const QString& expression = QString() );

  private:
    QgsFilterLineEdit* mLineEdit;
    QgsCodeEditorSQL* mCodeEditor;
    QToolButton* mButton;
    QString mExpressionDialogTitle;
    QScopedPointer<QgsDistanceArea> mDa;
    QgsExpressionContext mExpressionContext;
    QgsVectorLayer* mLayer;

    bool isExpressionValid( const QString& expressionStr );

    friend class TestQgsFieldExpressionWidget;
};

#endif // QGSEXPRESSIONLINEEDIT_H