qgsmaphittest.h

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/***************************************************************************
    qgsmaphittest.h
    ---------------------
    begin                : September 2014
    copyright            : (C) 2014 by Martin Dobias
    email                : wonder dot sk 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 QGSMAPHITTEST_H
#define QGSMAPHITTEST_H

#include "qgis_core.h"
#include "qgis_sip.h"
#include "qgsmapsettings.h"
#include "qgsgeometry.h"

#include <QSet>

class QgsRenderContext;
class QgsSymbol;
class QgsVectorLayer;
class QgsExpression;

class CORE_EXPORT QgsMapHitTest
{
  public:
    typedef QMap<QString, QString> LayerFilterExpression;

    QgsMapHitTest( const QgsMapSettings &settings, const QgsGeometry &polygon = QgsGeometry(), const QgsMapHitTest::LayerFilterExpression &layerFilterExpression = QgsMapHitTest::LayerFilterExpression() );

    QgsMapHitTest( const QgsMapSettings &settings, const QgsMapHitTest::LayerFilterExpression &layerFilterExpression );

    void run();

    bool symbolVisible( QgsSymbol *symbol, QgsVectorLayer *layer ) const;

    bool legendKeyVisible( const QString &ruleKey, QgsVectorLayer *layer ) const;

  private:

    typedef QSet<QString> SymbolSet;

    typedef QMap<QgsVectorLayer *, SymbolSet> HitTest;

    void runHitTestLayer( QgsVectorLayer *vl, SymbolSet &usedSymbols, SymbolSet &usedSymbolsRuleKey, QgsRenderContext &context );

    QgsMapSettings mSettings;

    HitTest mHitTest;

    HitTest mHitTestRuleKey;

    QgsMapHitTest::LayerFilterExpression mLayerFilterExpression;

    QgsGeometry mPolygon;

    bool mOnlyExpressions;
};

#endif // QGSMAPHITTEST_H