#8725-R: minor changes and UI update

+ add comment about 'prepareSimplification' in constructor
+ fix comment in 'providerCanSimplify'
+ improve UI messages

src/app/qgsoptions.cpp

@@ -563,10 +563,8 @@ QgsOptions::QgsOptions( QWidget *parent, Qt::WFlags fl ) :
 
   // Default simplify drawing configuration
   mSimplifyDrawingGroupBox->setChecked( settings.value( "/qgis/simplifyDrawingHints", ( int )QgsVectorLayer::GeometrySimplification ).toInt() != QgsVectorLayer::NoSimplification );
-  mSimplifyDrawingSlider->setValue(( int )( 5.0f * ( settings.value( "/qgis/simplifyDrawingTol", QGis::DEFAULT_MAPTOPIXEL_THRESHOLD ).toFloat() - 1 ) ) );
+  mSimplifyDrawingSpinBox->setValue( settings.value( "/qgis/simplifyDrawingTol", QGis::DEFAULT_MAPTOPIXEL_THRESHOLD ).toFloat() );
   mSimplifyDrawingAtProvider->setChecked( !settings.value( "/qgis/simplifyLocal", true ).toBool() );
-  mSimplifyDrawingPanel->setVisible( mSimplifyDrawingSlider->value() > 0 );
-  mSimplifyDrawingPx->setText( QString( "(%1 px)" ).arg( 1.0f + 0.2f * mSimplifyDrawingSlider->value() ) );
 
   // Slightly awkard here at the settings value is true to use QImage,
   // but the checkbox is true to use QPixmap
@@ -1104,10 +1102,10 @@ void QgsOptions::saveOptions()
   if ( mSimplifyDrawingGroupBox->isChecked() )
   {
     simplifyHints |= QgsVectorLayer::GeometrySimplification;
-    if ( mSimplifyDrawingSlider->value() > 0 ) simplifyHints |= QgsVectorLayer::AntialiasingSimplification;
+    if ( mSimplifyDrawingSpinBox->value() > 1 ) simplifyHints |= QgsVectorLayer::AntialiasingSimplification;
   }
   settings.setValue( "/qgis/simplifyDrawingHints", simplifyHints );
-  settings.setValue( "/qgis/simplifyDrawingTol", 1.0f + 0.2f*mSimplifyDrawingSlider->value() );
+  settings.setValue( "/qgis/simplifyDrawingTol", mSimplifyDrawingSpinBox->value() );
   settings.setValue( "/qgis/simplifyLocal", !mSimplifyDrawingAtProvider->isChecked() );
 
   // project
@@ -2087,10 +2085,3 @@ void QgsOptions::saveDefaultDatumTransformations()
 
   s.endGroup();
 }
-
-void QgsOptions::on_mSimplifyDrawingSlider_valueChanged( int value )
-{
-  mSimplifyDrawingPanel->setVisible( value > 0 );
-  mSimplifyDrawingPx->setText( QString( "(%1 px)" ).arg( 1.0f + 0.2f * value ) );
-}
-

src/app/qgsoptions.h

@@ -240,8 +240,6 @@ class APP_EXPORT QgsOptions : public QgsOptionsDialogBase, private Ui::QgsOption
     void on_mRemoveDefaultTransformButton_clicked();
     void on_mAddDefaultTransformButton_clicked();
 
-    void on_mSimplifyDrawingSlider_valueChanged( int value );
-
   private:
     QStringList i18nList();
     void initContrastEnhancement( QComboBox *cbox, QString name, QString defaultVal );

src/app/qgsvectorlayerproperties.cpp

@@ -395,9 +395,7 @@ void QgsVectorLayerProperties::syncToLayer( void )
   // get simplify drawing configuration
   const QgsVectorSimplifyMethod& simplifyMethod = layer->simplifyMethod();
   mSimplifyDrawingGroupBox->setChecked( simplifyMethod.simplifyHints() != QgsVectorLayer::NoSimplification );
-  mSimplifyDrawingSlider->setValue(( int )( 5.0f * ( simplifyMethod.threshold() - 1 ) ) );
-  mSimplifyDrawingPanel->setVisible( mSimplifyDrawingSlider->value() > 0 );
-  mSimplifyDrawingPx->setText( QString( "(%1 px)" ).arg( 1.0f + 0.2f * mSimplifyDrawingSlider->value() ) );
+  mSimplifyDrawingSpinBox->setValue( simplifyMethod.threshold() );
 
   if ( !( layer->dataProvider()->capabilities() & QgsVectorDataProvider::SimplifyGeometries ) )
   {
@@ -553,11 +551,11 @@ void QgsVectorLayerProperties::apply()
   if ( mSimplifyDrawingGroupBox->isChecked() )
   {
     simplifyHints |= QgsVectorLayer::GeometrySimplification;
-    if ( mSimplifyDrawingSlider->value() > 0 ) simplifyHints |= QgsVectorLayer::AntialiasingSimplification;
+    if ( mSimplifyDrawingSpinBox->value() > 1 ) simplifyHints |= QgsVectorLayer::AntialiasingSimplification;
   }
   QgsVectorSimplifyMethod simplifyMethod = layer->simplifyMethod();
   simplifyMethod.setSimplifyHints( simplifyHints );
-  simplifyMethod.setThreshold( 1.0f + 0.2f*mSimplifyDrawingSlider->value() );
+  simplifyMethod.setThreshold( mSimplifyDrawingSpinBox->value() );
   simplifyMethod.setForceLocalOptimization( !mSimplifyDrawingAtProvider->isChecked() );
   layer->setSimplifyMethod( simplifyMethod );
 
@@ -1100,12 +1098,6 @@ void QgsVectorLayerProperties::on_mMaximumScaleSetCurrentPushButton_clicked()
   cbMaximumScale->setScale( 1.0 / QgisApp::instance()->mapCanvas()->mapRenderer()->scale() );
 }
 
-void QgsVectorLayerProperties::on_mSimplifyDrawingSlider_valueChanged( int value )
-{
-  mSimplifyDrawingPanel->setVisible( value > 0 );
-  mSimplifyDrawingPx->setText( QString( "(%1 px)" ).arg( 1.0f + 0.2f * value ) );
-}
-
 void QgsVectorLayerProperties::on_mSimplifyDrawingGroupBox_toggled( bool checked )
 {
   if ( !( layer->dataProvider()->capabilities() & QgsVectorDataProvider::SimplifyGeometries ) )

src/app/qgsvectorlayerproperties.h

@@ -119,7 +119,6 @@ class APP_EXPORT QgsVectorLayerProperties : public QgsOptionsDialogBase, private
     void on_mMinimumScaleSetCurrentPushButton_clicked();
     void on_mMaximumScaleSetCurrentPushButton_clicked();
 
-    void on_mSimplifyDrawingSlider_valueChanged( int value );
     void on_mSimplifyDrawingGroupBox_toggled( bool checked );
 
   signals:

src/core/qgsfeatureiterator.cpp

@@ -83,7 +83,11 @@ bool QgsAbstractFeatureIterator::nextFeatureFilterFids( QgsFeature& f )
 
 void QgsAbstractFeatureIterator::ref()
 {
-  // prepare if required the simplification of geometries to fetch
+  // Prepare if required the simplification of geometries to fetch:
+  // This code runs here because of 'prepareSimplification()' is virtual and it can be overrided
+  // in inherited iterators who change the default behavior.
+  // It would be better to call this method in the constructor enabling virtual-calls as it is described by example at:
+  // http://www.parashift.com/c%2B%2B-faq-lite/calling-virtuals-from-ctor-idiom.html
   if ( refs == 0 )
   {
     prepareSimplification( mRequest.simplifyMethod() );

src/core/qgsfeatureiterator.h

@@ -96,7 +96,7 @@ class CORE_EXPORT QgsAbstractFeatureIterator
     //! this iterator runs local simplification
     bool mLocalSimplification;
 
-    //! returns whether the iterator can simplify on provider side the geometries to fetch using the specified method type
+    //! returns whether the iterator supports simplify geometries on provider side
     virtual bool providerCanSimplify( QgsSimplifyMethod::MethodType methodType ) const;
 
     //! simplify the specified geometry if it was configured

src/core/qgsvectorlayerfeatureiterator.h

@@ -122,7 +122,7 @@ class CORE_EXPORT QgsVectorLayerFeatureIterator : public QgsAbstractFeatureItera
     //! optional object to locally simplify edited (changed or added) geometries fetched by this feature iterator
     QgsAbstractGeometrySimplifier* mEditGeometrySimplifier;
 
-    //! returns whether the iterator can simplify on provider side the geometries to fetch using the specified method type
+    //! returns whether the iterator supports simplify geometries on provider side
     virtual bool providerCanSimplify( QgsSimplifyMethod::MethodType methodType ) const;
 };
 

src/providers/ogr/qgsogrfeatureiterator.h

@@ -65,7 +65,7 @@ class QgsOgrFeatureIterator : public QgsAbstractFeatureIterator
     //! optional object to simplify OGR-geometries fecthed by this feature iterator
     QgsOgrAbstractGeometrySimplifier* mGeometrySimplifier;
 
-    //! returns whether the iterator can simplify on provider side the geometries to fetch using the specified method type
+    //! returns whether the iterator supports simplify geometries on provider side
     virtual bool providerCanSimplify( QgsSimplifyMethod::MethodType methodType ) const;
 };
 

src/providers/postgres/qgspostgresfeatureiterator.h

@@ -70,7 +70,7 @@ class QgsPostgresFeatureIterator : public QgsAbstractFeatureIterator
     static const int sFeatureQueueSize;
 
   private:
-    //! returns whether the iterator can simplify on provider side the geometries to fetch using the specified method type
+    //! returns whether the iterator supports simplify geometries on provider side
     virtual bool providerCanSimplify( QgsSimplifyMethod::MethodType methodType ) const;
 };