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qgsmapcanvas.cpp
1653 lines (1343 loc) · 38.7 KB
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qgsmapcanvas.cpp
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/***************************************************************************
qgsmapcanvas.cpp - description
-------------------
begin : Sun Jun 30 2002
copyright : (C) 2002 by Gary E.Sherman
email : sherman at mrcc.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 <QtGlobal>
#include <QApplication>
#include <QCursor>
#include <QDir>
#include <QFile>
#include <QGraphicsItem>
#include <QGraphicsScene>
#include <QGraphicsView>
#include <QKeyEvent>
#include <QMouseEvent>
#include <QPainter>
#include <QPaintEvent>
#include <QPixmap>
#include <QRect>
#include <QTextStream>
#include <QResizeEvent>
#include <QString>
#include <QStringList>
#include <QWheelEvent>
#include "qgis.h"
#include "qgsapplication.h"
#include "qgscrscache.h"
#include "qgslogger.h"
#include "qgsmapcanvas.h"
#include "qgsmapcanvasmap.h"
#include "qgsmaplayer.h"
#include "qgsmaplayerregistry.h"
#include "qgsmaptoolpan.h"
#include "qgsmaptoolzoom.h"
#include "qgsmaptopixel.h"
#include "qgsmapoverviewcanvas.h"
#include "qgsmaprenderer.h"
#include "qgsmessagelog.h"
#include "qgsmessageviewer.h"
#include "qgsproject.h"
#include "qgsrubberband.h"
#include "qgsvectorlayer.h"
#include <math.h>
/** @deprecated to be deleted, stuff from here should be moved elsewhere */
class QgsMapCanvas::CanvasProperties
{
public:
CanvasProperties() : mouseButtonDown( false ), panSelectorDown( false ) { }
//!Flag to indicate status of mouse button
bool mouseButtonDown;
//! Last seen point of the mouse
QPoint mouseLastXY;
//! Beginning point of a rubber band
QPoint rubberStartPoint;
//! Flag to indicate the pan selector key is held down by user
bool panSelectorDown;
};
QgsMapCanvas::QgsMapCanvas( QWidget * parent, const char *name )
: QGraphicsView( parent )
, mCanvasProperties( new CanvasProperties )
, mNewSize( QSize() )
, mPainting( false )
, mAntiAliasing( false )
{
setObjectName( name );
mScene = new QGraphicsScene();
setScene( mScene );
setHorizontalScrollBarPolicy( Qt::ScrollBarAlwaysOff );
setVerticalScrollBarPolicy( Qt::ScrollBarAlwaysOff );
mLastExtentIndex = -1;
mCurrentLayer = NULL;
mMapOverview = NULL;
mMapTool = NULL;
mLastNonZoomMapTool = NULL;
mBackbufferEnabled = true;
mDrawing = false;
mFrozen = false;
mDirty = true;
setWheelAction( WheelZoom );
// by default, the canvas is rendered
mRenderFlag = true;
setMouseTracking( true );
setFocusPolicy( Qt::StrongFocus );
mMapRenderer = new QgsMapRenderer;
connect( mMapRenderer, SIGNAL( datumTransformInfoRequested( QgsMapLayer*, const QString&, const QString& ) ),
this, SLOT( getDatumTransformInfo( QgsMapLayer*, const QString& , const QString& ) ) );
// create map canvas item which will show the map
mMap = new QgsMapCanvasMap( this );
mScene->addItem( mMap );
mScene->update(); // porting??
moveCanvasContents( true );
connect( mMapRenderer, SIGNAL( drawError( QgsMapLayer* ) ), this, SLOT( showError( QgsMapLayer* ) ) );
connect( mMapRenderer, SIGNAL( hasCrsTransformEnabled( bool ) ), this, SLOT( crsTransformEnabled( bool ) ) );
crsTransformEnabled( hasCrsTransformEnabled() );
// project handling
connect( QgsProject::instance(), SIGNAL( readProject( const QDomDocument & ) ),
this, SLOT( readProject( const QDomDocument & ) ) );
connect( QgsProject::instance(), SIGNAL( writeProject( QDomDocument & ) ),
this, SLOT( writeProject( QDomDocument & ) ) );
mMap->resize( size() );
#ifdef Q_OS_WIN
// Enable touch event on Windows.
// Qt on Windows needs to be told it can take touch events or else it ignores them.
grabGesture( Qt::PinchGesture );
viewport()->setAttribute( Qt::WA_AcceptTouchEvents );
#endif
} // QgsMapCanvas ctor
QgsMapCanvas::~QgsMapCanvas()
{
if ( mMapTool )
{
mMapTool->deactivate();
mMapTool = NULL;
}
mLastNonZoomMapTool = NULL;
// delete canvas items prior to deleteing the canvas
// because they might try to update canvas when it's
// already being destructed, ends with segfault
QList<QGraphicsItem*> list = mScene->items();
QList<QGraphicsItem*>::iterator it = list.begin();
while ( it != list.end() )
{
QGraphicsItem* item = *it;
delete item;
it++;
}
mScene->deleteLater(); // crashes in python tests on windows
delete mMapRenderer;
// mCanvasProperties auto-deleted via std::auto_ptr
// CanvasProperties struct has its own dtor for freeing resources
} // dtor
void QgsMapCanvas::enableAntiAliasing( bool theFlag )
{
mAntiAliasing = theFlag;
mMap->enableAntiAliasing( theFlag );
if ( mMapOverview )
mMapOverview->enableAntiAliasing( theFlag );
} // anti aliasing
void QgsMapCanvas::useImageToRender( bool theFlag )
{
mMap->useImageToRender( theFlag );
refresh(); // redraw the map on change - prevents black map view
}
QgsMapCanvasMap* QgsMapCanvas::map()
{
return mMap;
}
QgsMapRenderer* QgsMapCanvas::mapRenderer()
{
return mMapRenderer;
}
QgsMapLayer* QgsMapCanvas::layer( int index )
{
QStringList& layers = mMapRenderer->layerSet();
if ( index >= 0 && index < ( int ) layers.size() )
return QgsMapLayerRegistry::instance()->mapLayer( layers[index] );
else
return NULL;
}
void QgsMapCanvas::setCurrentLayer( QgsMapLayer* layer )
{
mCurrentLayer = layer;
}
double QgsMapCanvas::scale()
{
return mMapRenderer->scale();
} // scale
void QgsMapCanvas::setDirty( bool dirty )
{
mDirty = dirty;
}
bool QgsMapCanvas::isDirty() const
{
return mDirty;
}
bool QgsMapCanvas::isDrawing()
{
return mDrawing;
} // isDrawing
// return the current coordinate transform based on the extents and
// device size
const QgsMapToPixel * QgsMapCanvas::getCoordinateTransform()
{
return mMapRenderer->coordinateTransform();
}
void QgsMapCanvas::setLayerSet( QList<QgsMapCanvasLayer> &layers )
{
if ( mDrawing )
{
QgsDebugMsg( "NOT updating layer set while drawing" );
return;
}
// create layer set
QStringList layerSet, layerSetOverview;
int i;
for ( i = 0; i < layers.size(); i++ )
{
QgsMapCanvasLayer &lyr = layers[i];
if ( !lyr.layer() )
{
continue;
}
if ( lyr.isVisible() )
{
layerSet.push_back( lyr.layer()->id() );
}
if ( lyr.isInOverview() )
{
layerSetOverview.push_back( lyr.layer()->id() );
}
}
QStringList& layerSetOld = mMapRenderer->layerSet();
bool layerSetChanged = layerSetOld != layerSet;
// update only if needed
if ( layerSetChanged )
{
QgsDebugMsg( "Layers changed to: " + layerSet.join( ", " ) );
for ( i = 0; i < layerCount(); i++ )
{
// Add check if vector layer when disconnecting from selectionChanged slot
// Ticket #811 - racicot
QgsMapLayer *currentLayer = layer( i );
disconnect( currentLayer, SIGNAL( repaintRequested() ), this, SLOT( refresh() ) );
disconnect( currentLayer, SIGNAL( screenUpdateRequested() ), this, SLOT( updateMap() ) );
QgsVectorLayer *isVectLyr = qobject_cast<QgsVectorLayer *>( currentLayer );
if ( isVectLyr )
{
disconnect( currentLayer, SIGNAL( selectionChanged() ), this, SLOT( selectionChangedSlot() ) );
}
}
mMapRenderer->setLayerSet( layerSet );
for ( i = 0; i < layerCount(); i++ )
{
// Add check if vector layer when connecting to selectionChanged slot
// Ticket #811 - racicot
QgsMapLayer *currentLayer = layer( i );
connect( currentLayer, SIGNAL( repaintRequested() ), this, SLOT( refresh() ) );
connect( currentLayer, SIGNAL( screenUpdateRequested() ), this, SLOT( updateMap() ) );
QgsVectorLayer *isVectLyr = qobject_cast<QgsVectorLayer *>( currentLayer );
if ( isVectLyr )
{
connect( currentLayer, SIGNAL( selectionChanged() ), this, SLOT( selectionChangedSlot() ) );
}
}
QgsDebugMsg( "Layers have changed, refreshing" );
emit layersChanged();
refresh();
}
if ( mMapOverview )
{
QStringList& layerSetOvOld = mMapOverview->layerSet();
if ( layerSetOvOld != layerSetOverview )
{
mMapOverview->setLayerSet( layerSetOverview );
}
// refresh overview maplayers even if layer set is the same
// because full extent might have changed
updateOverview();
}
} // setLayerSet
void QgsMapCanvas::enableOverviewMode( QgsMapOverviewCanvas* overview )
{
if ( mMapOverview )
{
// disconnect old map overview if exists
disconnect( mMapRenderer, SIGNAL( hasCrsTransformEnabled( bool ) ),
mMapOverview, SLOT( hasCrsTransformEnabled( bool ) ) );
disconnect( mMapRenderer, SIGNAL( destinationSrsChanged() ),
mMapOverview, SLOT( destinationSrsChanged() ) );
// map overview is not owned by map canvas so don't delete it...
}
mMapOverview = overview;
if ( overview )
{
// connect to the map render to copy its projection settings
connect( mMapRenderer, SIGNAL( hasCrsTransformEnabled( bool ) ),
overview, SLOT( hasCrsTransformEnabled( bool ) ) );
connect( mMapRenderer, SIGNAL( destinationSrsChanged() ),
overview, SLOT( destinationSrsChanged() ) );
}
}
void QgsMapCanvas::updateOverview()
{
// redraw overview
if ( mMapOverview )
{
mMapOverview->refresh();
}
}
QgsMapLayer* QgsMapCanvas::currentLayer()
{
return mCurrentLayer;
}
void QgsMapCanvas::refresh()
{
// we can't draw again if already drawing...
if ( mDrawing )
return;
QSettings settings;
bool logRefresh = settings.value( "/Map/logCanvasRefreshEvent", false ).toBool();
QTime t;
if ( logRefresh )
{
t.start();
}
#ifdef Q_WS_X11
bool enableBackbufferSetting = settings.value( "/Map/enableBackbuffer", 1 ).toBool();
#endif
#ifdef Q_WS_X11
#ifndef ANDROID
// disable the update that leads to the resize crash on X11 systems
if ( viewport() )
{
if ( enableBackbufferSetting != mBackbufferEnabled )
{
qDebug() << "Enable back buffering: " << enableBackbufferSetting;
if ( enableBackbufferSetting )
{
viewport()->setAttribute( Qt::WA_PaintOnScreen, false );
}
else
{
viewport()->setAttribute( Qt::WA_PaintOnScreen, true );
}
mBackbufferEnabled = enableBackbufferSetting;
}
}
#endif // ANDROID
#endif // Q_WS_X11
mDrawing = true;
if ( mRenderFlag && !mFrozen )
{
clear();
// Tell the user we're going to be a while
QApplication::setOverrideCursor( Qt::WaitCursor );
emit renderStarting();
mMap->render();
mDirty = false;
// notify any listeners that rendering is complete
QPainter p;
p.begin( &mMap->paintDevice() );
emit renderComplete( &p );
p.end();
// notifies current map tool
if ( mMapTool )
mMapTool->renderComplete();
// Tell the user we've finished going to be a while
QApplication::restoreOverrideCursor();
}
mDrawing = false;
// Done refreshing
emit mapCanvasRefreshed();
if ( logRefresh )
{
QString logMsg = tr( "Canvas refresh: %1 ms" ).arg( t.elapsed() );
QObject* senderObj = QObject::sender();
if ( senderObj )
{
logMsg += tr( ", sender '%1'" ).arg( senderObj->metaObject()->className() );
}
QgsMessageLog::logMessage( logMsg, tr( "Rendering" ) );
}
} // refresh
void QgsMapCanvas::updateMap()
{
if ( mMap )
{
mMap->updateContents();
}
}
//the format defaults to "PNG" if not specified
void QgsMapCanvas::saveAsImage( QString theFileName, QPixmap * theQPixmap, QString theFormat )
{
//
//check if the optional QPaintDevice was supplied
//
if ( theQPixmap != NULL )
{
// render
QPainter painter;
painter.begin( theQPixmap );
mMapRenderer->render( &painter );
emit renderComplete( &painter );
painter.end();
theQPixmap->save( theFileName, theFormat.toLocal8Bit().data() );
}
else //use the map view
{
QPixmap *pixmap = dynamic_cast<QPixmap *>( &mMap->paintDevice() );
if ( !pixmap )
return;
pixmap->save( theFileName, theFormat.toLocal8Bit().data() );
}
//create a world file to go with the image...
QgsRectangle myRect = mMapRenderer->extent();
QString myHeader;
// note: use 17 places of precision for all numbers output
//Pixel XDim
myHeader += qgsDoubleToString( mapUnitsPerPixel() ) + "\r\n";
//Rotation on y axis - hard coded
myHeader += "0 \r\n";
//Rotation on x axis - hard coded
myHeader += "0 \r\n";
//Pixel YDim - almost always negative - see
//http://en.wikipedia.org/wiki/World_file#cite_note-2
myHeader += "-" + qgsDoubleToString( mapUnitsPerPixel() ) + "\r\n";
//Origin X (center of top left cell)
myHeader += qgsDoubleToString( myRect.xMinimum() + ( mapUnitsPerPixel() / 2 ) ) + "\r\n";
//Origin Y (center of top left cell)
myHeader += qgsDoubleToString( myRect.yMaximum() - ( mapUnitsPerPixel() / 2 ) ) + "\r\n";
QFileInfo myInfo = QFileInfo( theFileName );
// allow dotted names
QString myWorldFileName = myInfo.absolutePath() + "/" + myInfo.completeBaseName() + "." + theFormat + "w";
QFile myWorldFile( myWorldFileName );
if ( !myWorldFile.open( QIODevice::WriteOnly ) ) //don't use QIODevice::Text
{
return;
}
QTextStream myStream( &myWorldFile );
myStream << myHeader;
} // saveAsImage
QgsRectangle QgsMapCanvas::extent() const
{
return mMapRenderer->extent();
} // extent
QgsRectangle QgsMapCanvas::fullExtent() const
{
return mMapRenderer->fullExtent();
} // extent
void QgsMapCanvas::updateFullExtent()
{
// projection settings have changed
QgsDebugMsg( "updating full extent" );
mMapRenderer->updateFullExtent();
refresh();
}
void QgsMapCanvas::setExtent( QgsRectangle const & r )
{
if ( mDrawing )
{
return;
}
QgsRectangle current = extent();
if ( r.isEmpty() )
{
QgsDebugMsg( "Empty extent - keeping old extent with new center!" );
QgsRectangle e( QgsPoint( r.center().x() - current.width() / 2.0, r.center().y() - current.height() / 2.0 ),
QgsPoint( r.center().x() + current.width() / 2.0, r.center().y() + current.height() / 2.0 ) );
mMapRenderer->setExtent( e );
}
else
{
mMapRenderer->setExtent( r );
}
emit extentsChanged();
updateScale();
if ( mMapOverview )
mMapOverview->drawExtentRect();
if ( mLastExtent.size() > 20 )
mLastExtent.removeAt( 0 );
//clear all extent items after current index
for ( int i = mLastExtent.size() - 1; i > mLastExtentIndex; i-- )
{
mLastExtent.removeAt( i );
}
mLastExtent.append( extent() ) ;
// adjust history to no more than 20
if ( mLastExtent.size() > 20 )
{
mLastExtent.removeAt( 0 );
}
// the last item is the current extent
mLastExtentIndex = mLastExtent.size() - 1;
// update controls' enabled state
emit zoomLastStatusChanged( mLastExtentIndex > 0 );
emit zoomNextStatusChanged( mLastExtentIndex < mLastExtent.size() - 1 );
// notify canvas items of change
updateCanvasItemPositions();
} // setExtent
void QgsMapCanvas::updateScale()
{
double scale = mMapRenderer->scale();
emit scaleChanged( scale );
}
void QgsMapCanvas::clear()
{
// Indicate to the next paint event that we need to rebuild the canvas contents
setDirty( true );
} // clear
void QgsMapCanvas::zoomToFullExtent()
{
if ( mDrawing )
{
return;
}
QgsRectangle extent = fullExtent();
// If the full extent is an empty set, don't do the zoom
if ( !extent.isEmpty() )
{
// Add a 5% margin around the full extent
extent.scale( 1.05 );
setExtent( extent );
}
refresh();
} // zoomToFullExtent
void QgsMapCanvas::zoomToPreviousExtent()
{
if ( mDrawing )
{
return;
}
if ( mLastExtentIndex > 0 )
{
mLastExtentIndex--;
mMapRenderer->setExtent( mLastExtent[mLastExtentIndex] );
emit extentsChanged();
updateScale();
if ( mMapOverview )
mMapOverview->drawExtentRect();
refresh();
// update controls' enabled state
emit zoomLastStatusChanged( mLastExtentIndex > 0 );
emit zoomNextStatusChanged( mLastExtentIndex < mLastExtent.size() - 1 );
// notify canvas items of change
updateCanvasItemPositions();
}
} // zoomToPreviousExtent
void QgsMapCanvas::zoomToNextExtent()
{
if ( mDrawing )
{
return;
}
if ( mLastExtentIndex < mLastExtent.size() - 1 )
{
mLastExtentIndex++;
mMapRenderer->setExtent( mLastExtent[mLastExtentIndex] );
emit extentsChanged();
updateScale();
if ( mMapOverview )
mMapOverview->drawExtentRect();
refresh();
// update controls' enabled state
emit zoomLastStatusChanged( mLastExtentIndex > 0 );
emit zoomNextStatusChanged( mLastExtentIndex < mLastExtent.size() - 1 );
// notify canvas items of change
updateCanvasItemPositions();
}
}// zoomToNextExtent
void QgsMapCanvas::clearExtentHistory()
{
mLastExtent.clear(); // clear the zoom history list
mLastExtent.append( extent() ) ; // set the current extent in the list
mLastExtentIndex = mLastExtent.size() - 1;
// update controls' enabled state
emit zoomLastStatusChanged( mLastExtentIndex > 0 );
emit zoomNextStatusChanged( mLastExtentIndex < mLastExtent.size() - 1 );
}// clearExtentHistory
bool QgsMapCanvas::hasCrsTransformEnabled()
{
return mMapRenderer->hasCrsTransformEnabled();
}
void QgsMapCanvas::mapUnitsChanged()
{
// We assume that if the map units have changed, the changed value
// will be accessible from QgsMapRenderer
// And then force a redraw of the scale number in the status bar
updateScale();
// And then redraw the map to force the scale bar to update
// itself. This is less than ideal as the entire map gets redrawn
// just to get the scale bar to redraw itself. If we ask the scale
// bar to redraw itself without redrawing the map, the existing
// scale bar is not removed, and we end up with two scale bars in
// the same location. This can perhaps be fixed when/if the scale
// bar is done as a transparent layer on top of the map canvas.
refresh();
}
void QgsMapCanvas::zoomToSelected( QgsVectorLayer* layer )
{
if ( mDrawing )
{
return;
}
if ( layer == NULL )
{
// use current layer by default
layer = qobject_cast<QgsVectorLayer *>( mCurrentLayer );
}
if ( layer == NULL )
{
return;
}
if ( layer->selectedFeatureCount() == 0 )
{
return;
}
QgsRectangle rect = mMapRenderer->layerExtentToOutputExtent( layer, layer->boundingBoxOfSelected() );
// no selected features, only one selected point feature
//or two point features with the same x- or y-coordinates
if ( rect.isEmpty() )
{
// zoom in
QgsPoint c = rect.center();
rect = extent();
rect.scale( 1.0, &c );
}
//zoom to an area
else
{
// Expand rect to give a bit of space around the selected
// objects so as to keep them clear of the map boundaries
// The same 5% should apply to all margins.
rect.scale( 1.05 );
}
setExtent( rect );
refresh();
} // zoomToSelected
void QgsMapCanvas::panToSelected( QgsVectorLayer* layer )
{
if ( mDrawing )
{
return;
}
if ( layer == NULL )
{
// use current layer by default
layer = qobject_cast<QgsVectorLayer *>( mCurrentLayer );
}
if ( layer == NULL )
{
return;
}
if ( layer->selectedFeatureCount() == 0 )
{
return;
}
QgsRectangle rect = mMapRenderer->layerExtentToOutputExtent( layer, layer->boundingBoxOfSelected() );
setExtent( QgsRectangle( rect.center(), rect.center() ) );
refresh();
} // panToSelected
void QgsMapCanvas::keyPressEvent( QKeyEvent * e )
{
if ( mDrawing )
{
e->ignore();
}
emit keyPressed( e );
if ( mCanvasProperties->mouseButtonDown || mCanvasProperties->panSelectorDown )
return;
QPainter paint;
QPen pen( Qt::gray );
QgsPoint ll, ur;
if ( ! mCanvasProperties->mouseButtonDown )
{
// Don't want to interfer with mouse events
QgsRectangle currentExtent = mMapRenderer->extent();
double dx = qAbs(( currentExtent.xMaximum() - currentExtent.xMinimum() ) / 4 );
double dy = qAbs(( currentExtent.yMaximum() - currentExtent.yMinimum() ) / 4 );
switch ( e->key() )
{
case Qt::Key_Left:
QgsDebugMsg( "Pan left" );
currentExtent.setXMinimum( currentExtent.xMinimum() - dx );
currentExtent.setXMaximum( currentExtent.xMaximum() - dx );
setExtent( currentExtent );
refresh();
break;
case Qt::Key_Right:
QgsDebugMsg( "Pan right" );
currentExtent.setXMinimum( currentExtent.xMinimum() + dx );
currentExtent.setXMaximum( currentExtent.xMaximum() + dx );
setExtent( currentExtent );
refresh();
break;
case Qt::Key_Up:
QgsDebugMsg( "Pan up" );
currentExtent.setYMaximum( currentExtent.yMaximum() + dy );
currentExtent.setYMinimum( currentExtent.yMinimum() + dy );
setExtent( currentExtent );
refresh();
break;
case Qt::Key_Down:
QgsDebugMsg( "Pan down" );
currentExtent.setYMaximum( currentExtent.yMaximum() - dy );
currentExtent.setYMinimum( currentExtent.yMinimum() - dy );
setExtent( currentExtent );
refresh();
break;
case Qt::Key_Space:
QgsDebugMsg( "Pressing pan selector" );
//mCanvasProperties->dragging = true;
if ( ! e->isAutoRepeat() )
{
mCanvasProperties->panSelectorDown = true;
mCanvasProperties->rubberStartPoint = mCanvasProperties->mouseLastXY;
}
break;
case Qt::Key_PageUp:
QgsDebugMsg( "Zoom in" );
zoomIn();
break;
case Qt::Key_PageDown:
QgsDebugMsg( "Zoom out" );
zoomOut();
break;
default:
// Pass it on
if ( mMapTool )
{
mMapTool->keyPressEvent( e );
}
e->ignore();
QgsDebugMsg( "Ignoring key: " + QString::number( e->key() ) );
}
}
} //keyPressEvent()
void QgsMapCanvas::keyReleaseEvent( QKeyEvent * e )
{
QgsDebugMsg( "keyRelease event" );
if ( mDrawing )
{
return;
}
switch ( e->key() )
{
case Qt::Key_Space:
if ( !e->isAutoRepeat() && mCanvasProperties->panSelectorDown )
{
QgsDebugMsg( "Releasing pan selector" );
mCanvasProperties->panSelectorDown = false;
panActionEnd( mCanvasProperties->mouseLastXY );
}
break;
default:
// Pass it on
if ( mMapTool )
{
mMapTool->keyReleaseEvent( e );
}
e->ignore();
QgsDebugMsg( "Ignoring key release: " + QString::number( e->key() ) );
}
emit keyReleased( e );
} //keyReleaseEvent()
void QgsMapCanvas::mouseDoubleClickEvent( QMouseEvent * e )
{
if ( mDrawing )
{
return;
}
// call handler of current map tool
if ( mMapTool )
mMapTool->canvasDoubleClickEvent( e );
} // mouseDoubleClickEvent
void QgsMapCanvas::mousePressEvent( QMouseEvent * e )
{
if ( mDrawing )
{
return;
}
//use middle mouse button for panning, map tools won't receive any events in that case
if ( e->button() == Qt::MidButton )
{
mCanvasProperties->panSelectorDown = true;
mCanvasProperties->rubberStartPoint = mCanvasProperties->mouseLastXY;
}
else
{
// call handler of current map tool
if ( mMapTool )
mMapTool->canvasPressEvent( e );
}
if ( mCanvasProperties->panSelectorDown )
{
return;
}
mCanvasProperties->mouseButtonDown = true;
mCanvasProperties->rubberStartPoint = e->pos();
} // mousePressEvent
void QgsMapCanvas::mouseReleaseEvent( QMouseEvent * e )
{
if ( mDrawing )
{
return;
}
//use middle mouse button for panning, map tools won't receive any events in that case
if ( e->button() == Qt::MidButton )
{
mCanvasProperties->panSelectorDown = false;
panActionEnd( mCanvasProperties->mouseLastXY );
}
else
{
// call handler of current map tool
if ( mMapTool )
{
// right button was pressed in zoom tool? return to previous non zoom tool
if ( e->button() == Qt::RightButton && mMapTool->isTransient() )
{
QgsDebugMsg( "Right click in map tool zoom or pan, last tool is " +
QString( mLastNonZoomMapTool ? "not null." : "null." ) );