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Add warning for printing and pdf export with blend modes with option …

…to print as raster
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nyalldawson committed May 5, 2013
1 parent 471dab1 commit 2479d83262dcd0cae809cb3f206f8a7843ac2900
@@ -631,6 +631,11 @@ void QgsComposer::on_mActionExportAsPDF_triggered()
showWMSPrintingWarning();
}

if ( containsBlendModes() )
{
showBlendModePrintingWarning();
}

bool hasAnAtlas = mComposition->atlasComposition().enabled();
bool atlasOnASingleFile = hasAnAtlas && mComposition->atlasComposition().singleFile();
QgsAtlasComposition* atlasMap = &mComposition->atlasComposition();
@@ -805,6 +810,11 @@ void QgsComposer::on_mActionPrint_triggered()
showWMSPrintingWarning();
}

if ( containsBlendModes() )
{
showBlendModePrintingWarning();
}

//orientation and page size are already set to QPrinter in the page setup dialog
QPrintDialog printDialog( &mPrinter, 0 );
if ( printDialog.exec() != QDialog::Accepted )
@@ -2010,6 +2020,42 @@ bool QgsComposer::containsWMSLayer() const
return false;
}

bool QgsComposer::containsBlendModes() const
{
// Check if composer contains any blend modes
QMap<QgsComposerItem*, QWidget*>::const_iterator item_it = mItemWidgetMap.constBegin();
QgsComposerItem* currentItem = 0;
QgsComposerMap* currentMap = 0;

for ( ; item_it != mItemWidgetMap.constEnd(); ++item_it )
{
currentItem = item_it.key();
// Check composer item's blend mode
if ( currentItem->blendMode() != QPainter::CompositionMode_SourceOver )
{
return true;
}
// If item is a composer map, check if it contains any blended layers
currentMap = dynamic_cast<QgsComposerMap *>( currentItem );
if ( currentMap )
{
if ( currentMap->containsBlendModes() )
{
return true;
}
if ( currentMap->overviewFrameMapId() != -1 )
{
// map contains an overview, check its blend mode
if ( currentMap->overviewBlendMode() != QPainter::CompositionMode_SourceOver )
{
return true;
}
}
}
}
return false;
}

void QgsComposer::showWMSPrintingWarning()
{
QString myQSettingsLabel = "/UI/displayComposerWMSWarning";
@@ -2029,6 +2075,31 @@ void QgsComposer::showWMSPrintingWarning()
}
}

void QgsComposer::showBlendModePrintingWarning()
{
if ( ! mComposition->printAsRaster() )
{
QgsMessageViewer* m = new QgsMessageViewer( this );
m->setWindowTitle( tr( "Project contains blend modes" ) );
m->setMessage( tr( "Blend modes are enabled in this project, which cannot be printed as vectors. Printing as a raster is recommended." ), QgsMessageOutput::MessageText );
m->setCheckBoxText( tr( "Print as raster" ) );
m->setCheckBoxState( Qt::Checked );
m->setCheckBoxVisible( true );
m->showMessage( true );

// TODO - fix this - checkBoxState is never true
// also need to make sure composer print as raster checkbox is updated
if ( m->checkBoxState() == Qt::Checked )
{
mComposition->setPrintAsRaster( true );
}
else
{
mComposition->setPrintAsRaster( true );
}
}
}

void QgsComposer::cleanupAfterTemplateRead()
{
QMap<QgsComposerItem*, QWidget*>::const_iterator itemIt = mItemWidgetMap.constBegin();
@@ -309,9 +309,15 @@ class QgsComposer: public QMainWindow, private Ui::QgsComposerBase
//! True if a composer map contains a WMS layer
bool containsWMSLayer() const;

//! True if a composer contains blend modes
bool containsBlendModes() const;

//! Displays a warning because of possible min/max size in WMS
void showWMSPrintingWarning();

//! Displays a warning because of incompatibility between blend modes and QPrinter
void showBlendModePrintingWarning();

//! Changes elements that are not suitable for this project
void cleanupAfterTemplateRead();

@@ -27,6 +27,7 @@
#include "qgsrendercontext.h"
#include "qgsscalecalculator.h"
#include "qgsvectorlayer.h"
#include "qgspallabeling.h"

#include "qgslabel.h"
#include "qgslabelattributes.h"
@@ -627,6 +628,53 @@ bool QgsComposerMap::containsWMSLayer() const
return false;
}

bool QgsComposerMap::containsBlendModes() const
{
if ( !mMapRenderer )
{
return false;
}

QStringList layers = mMapRenderer->layerSet();

//Also need to check PAL labeling for blend modes
QgsPalLabeling* lbl = dynamic_cast<QgsPalLabeling*>( mMapRenderer->labelingEngine() );

QStringList::const_iterator layer_it = layers.constBegin();
QgsMapLayer* currentLayer = 0;

for ( ; layer_it != layers.constEnd(); ++layer_it )
{
currentLayer = QgsMapLayerRegistry::instance()->mapLayer( *layer_it );
if ( currentLayer )
{
if ( currentLayer->blendMode() != QPainter::CompositionMode_SourceOver )
{
return true;
}
// if vector layer and has labels, check label blend modes
QgsVectorLayer* currentVectorLayer = qobject_cast<QgsVectorLayer *>( currentLayer );
if ( currentVectorLayer )
{
if ( lbl->willUseLayer( currentVectorLayer ) )
{
// Check all label blending properties
QgsPalLayerSettings& layerSettings = lbl->layer( currentVectorLayer->id() );
if (( layerSettings.blendMode != QPainter::CompositionMode_SourceOver ) ||
( layerSettings.bufferSize != 0 && layerSettings.bufferBlendMode != QPainter::CompositionMode_SourceOver ) ||
( layerSettings.shadowDraw && layerSettings.shadowBlendMode != QPainter::CompositionMode_SourceOver ) ||
( layerSettings.shapeDraw && layerSettings.shapeBlendMode != QPainter::CompositionMode_SourceOver ) )
{
return true;
}
}
}
}
}

return false;
}

void QgsComposerMap::connectUpdateSlot()
{
//connect signal from layer registry to update in case of new or deleted layers
@@ -183,6 +183,9 @@ class CORE_EXPORT QgsComposerMap : public QgsComposerItem
/**True if composer map renders a WMS layer*/
bool containsWMSLayer() const;

/**True if composer map contains layers with blend modes*/
bool containsBlendModes() const;

/** stores state in Dom node
* @param elem is Dom element corresponding to 'Composer' tag
* @param doc Dom document

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