QGIS API Documentation
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src
gui
qgslegendfilterbutton.h
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/***************************************************************************
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qgslegendfilterbutton.h - QToolButton for legend filter by map content
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--------------------------------------
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Date : June 2015
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Copyright : (C) 2015 by Hugo Mercier at Oslandia
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Email : hugo dot mercier at oslandia dot com
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***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************/
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#ifndef QGS_LEGEND_FILTER_BUTTON_H
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#define QGS_LEGEND_FILTER_BUTTON_H
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#include <QToolButton>
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#include "qgis_gui.h"
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#include "
qgsexpressioncontext.h
"
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class
QgsVectorLayer
;
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class
QgsExpressionContextGenerator
;
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class
GUI_EXPORT
QgsLegendFilterButton
:
public
QToolButton
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{
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Q_OBJECT
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public
:
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QgsLegendFilterButton
( QWidget *parent =
nullptr
);
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QString expressionText()
const
;
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void
setExpressionText(
const
QString &expression );
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void
registerExpressionContextGenerator(
QgsExpressionContextGenerator
*generator );
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QgsVectorLayer
*vectorLayer()
const
;
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void
setVectorLayer(
QgsVectorLayer
*layer );
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signals:
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void
expressionTextChanged
();
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private
:
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QMenu *mMenu =
nullptr
;
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QAction *mSetExpressionAction =
nullptr
;
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QAction *mClearExpressionAction =
nullptr
;
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QString mExpression;
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QgsExpressionContextGenerator
*mExpressionContextGenerator =
nullptr
;
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void
updateMenu();
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QgsVectorLayer
*mLayer =
nullptr
;
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private
slots:
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void
onSetLegendFilterExpression();
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void
onClearFilterExpression();
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void
onToggle(
bool
);
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};
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#endif
// QGS_FILTER_LEGEND_BUTTON_H
QgsExpressionContextGenerator
Abstract interface for generating an expression context.
Definition
qgsexpressioncontextgenerator.h:36
QgsLegendFilterButton
A tool button that allows enabling or disabling legend filter by contents of the map.
Definition
qgslegendfilterbutton.h:33
QgsLegendFilterButton::expressionTextChanged
void expressionTextChanged()
Emitted when the expression text changes.
QgsVectorLayer
Represents a vector layer which manages a vector based data sets.
Definition
qgsvectorlayer.h:401
qgsexpressioncontext.h
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