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qgsmaptoolfeatureaction.cpp
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qgsmaptoolfeatureaction.cpp
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/***************************************************************************
qgsmaptoolfeatureaction.h - map tool for running feature actions
---------------------
begin : January 2012
copyright : (C) 2012 by Giuseppe Sucameli
email : brush.tyler 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. *
* *
***************************************************************************/
#include "qgsmaptoolfeatureaction.h"
#include "qgsfeature.h"
#include "qgsfeatureiterator.h"
#include "qgsfield.h"
#include "qgsgeometry.h"
#include "qgslogger.h"
#include "qgsmapcanvas.h"
#include "qgsmaptopixel.h"
#include "qgsmessageviewer.h"
#include "qgsactionmanager.h"
#include "qgscoordinatereferencesystem.h"
#include "qgscsexception.h"
#include "qgsvectordataprovider.h"
#include "qgsvectorlayer.h"
#include "qgsproject.h"
#include "qgsmaplayerregistry.h"
#include "qgsmaplayeractionregistry.h"
#include "qgisapp.h"
#include <QSettings>
#include <QMouseEvent>
#include <QStatusBar>
QgsMapToolFeatureAction::QgsMapToolFeatureAction( QgsMapCanvas* canvas )
: QgsMapTool( canvas )
{
}
QgsMapToolFeatureAction::~QgsMapToolFeatureAction()
{
}
void QgsMapToolFeatureAction::canvasMoveEvent( QgsMapMouseEvent* e )
{
Q_UNUSED( e );
}
void QgsMapToolFeatureAction::canvasPressEvent( QgsMapMouseEvent* e )
{
Q_UNUSED( e );
}
void QgsMapToolFeatureAction::canvasReleaseEvent( QgsMapMouseEvent* e )
{
QgsMapLayer *layer = mCanvas->currentLayer();
if ( !layer || layer->type() != QgsMapLayer::VectorLayer )
{
emit messageEmitted( tr( "To run an action, you must choose an active vector layer." ), QgsMessageBar::INFO );
return;
}
if ( !mCanvas->layers().contains( layer ) )
{
// do not run actions on hidden layers
return;
}
QgsVectorLayer *vlayer = qobject_cast<QgsVectorLayer *>( layer );
if ( vlayer->actions()->size() == 0 && QgsMapLayerActionRegistry::instance()->mapLayerActions( vlayer ).isEmpty() )
{
emit messageEmitted( tr( "The active vector layer has no defined actions" ), QgsMessageBar::INFO );
return;
}
if ( !doAction( vlayer, e->x(), e->y() ) )
QgisApp::instance()->statusBar()->showMessage( tr( "No features at this position found." ) );
}
void QgsMapToolFeatureAction::activate()
{
QgsMapTool::activate();
}
void QgsMapToolFeatureAction::deactivate()
{
QgsMapTool::deactivate();
}
bool QgsMapToolFeatureAction::doAction( QgsVectorLayer *layer, int x, int y )
{
if ( !layer )
return false;
QgsPoint point = mCanvas->getCoordinateTransform()->toMapCoordinates( x, y );
QgsFeatureList featList;
// toLayerCoordinates will throw an exception for an 'invalid' point.
// For example, if you project a world map onto a globe using EPSG 2163
// and then click somewhere off the globe, an exception will be thrown.
try
{
// create the search rectangle
double searchRadius = searchRadiusMU( mCanvas );
QgsRectangle r;
r.setXMinimum( point.x() - searchRadius );
r.setXMaximum( point.x() + searchRadius );
r.setYMinimum( point.y() - searchRadius );
r.setYMaximum( point.y() + searchRadius );
r = toLayerCoordinates( layer, r );
QgsFeatureIterator fit = layer->getFeatures( QgsFeatureRequest().setFilterRect( r ).setFlags( QgsFeatureRequest::ExactIntersect ) );
QgsFeature f;
while ( fit.nextFeature( f ) )
featList << QgsFeature( f );
}
catch ( QgsCsException & cse )
{
Q_UNUSED( cse );
// catch exception for 'invalid' point and proceed with no features found
QgsDebugMsg( QString( "Caught CRS exception %1" ).arg( cse.what() ) );
}
if ( featList.isEmpty() )
return false;
Q_FOREACH ( const QgsFeature& feat, featList )
{
if ( layer->actions()->defaultAction() >= 0 )
{
// define custom substitutions: layer id and clicked coords
QgsExpressionContext context;
context << QgsExpressionContextUtils::globalScope()
<< QgsExpressionContextUtils::projectScope()
<< QgsExpressionContextUtils::mapSettingsScope( mCanvas->mapSettings() );
QgsExpressionContextScope* actionScope = new QgsExpressionContextScope();
actionScope->setVariable( "click_x", point.x() );
actionScope->setVariable( "click_y", point.y() );
context << actionScope;
int actionIdx = layer->actions()->defaultAction();
layer->actions()->doAction( actionIdx, feat, context );
}
else
{
QgsMapLayerAction* mapLayerAction = QgsMapLayerActionRegistry::instance()->defaultActionForLayer( layer );
if ( mapLayerAction )
{
mapLayerAction->triggerForFeature( layer, &feat );
}
}
}
return true;
}