qgslegendfilterbutton.h

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/***************************************************************************
    qgslegendfilterbutton.h - QToolButton for legend filter by map content
     --------------------------------------
    Date                 : June 2015
    Copyright            : (C) 2015 by Hugo Mercier at Oslandia
    Email                : hugo dot mercier at oslandia 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 QGS_LEGEND_FILTER_BUTTON_H
#define QGS_LEGEND_FILTER_BUTTON_H
 
#include <QToolButton>
#include "qgis_gui.h"
#include "qgsexpressioncontext.h"
 
class QgsVectorLayer;
class QgsExpressionContextGenerator;
 
class GUI_EXPORT QgsLegendFilterButton: public QToolButton
{
    Q_OBJECT
 
  public:
 
    QgsLegendFilterButton( QWidget *parent = nullptr );
 
    QString expressionText() const;
 
    void setExpressionText( const QString &expression );
 
    void registerExpressionContextGenerator( QgsExpressionContextGenerator *generator );
 
    QgsVectorLayer *vectorLayer() const;
 
    void setVectorLayer( QgsVectorLayer *layer );
 
  signals:
 
    void expressionTextChanged();
 
  private:
    QMenu *mMenu = nullptr;
    QAction *mSetExpressionAction = nullptr;
    QAction *mClearExpressionAction = nullptr;
    QString mExpression;
    QgsExpressionContextGenerator *mExpressionContextGenerator = nullptr;
 
    void updateMenu();
 
    QgsVectorLayer *mLayer = nullptr;
  private slots:
    void onSetLegendFilterExpression();
    void onClearFilterExpression();
    void onToggle( bool );
};
 
#endif // QGS_FILTER_LEGEND_BUTTON_H