More const correctness, fix crash with atlas

Author: nyalldawson

python/core/composer/qgsatlascomposition.sip

@@ -177,12 +177,12 @@ public:
     /**Prepare the atlas map for the given feature. Sets the extent and context variables
      * @returns true if feature was successfully prepared
     */
-    bool prepareForFeature( int i );
+    bool prepareForFeature( const int i );
 
     /**Prepare the atlas map for the given feature. Sets the extent and context variables
      * @returns true if feature was successfully prepared
     */
-    bool prepareForFeature( QgsFeature * feat );
+    bool prepareForFeature( const QgsFeature * feat );
 
     /** Returns the current filename. Must be called after prepareForFeature( i ) */
     const QString& currentFilename() const;

src/app/composer/qgscomposer.cpp

@@ -3531,7 +3531,7 @@ void QgsComposer::writeWorldFile( QString worldFileName, double a, double b, dou
 }
 
 
-void QgsComposer::setAtlasFeature( QgsMapLayer* layer, QgsFeature * feat )
+void QgsComposer::setAtlasFeature( QgsMapLayer* layer, const QgsFeature * feat )
 {
   //update expression variables
   QgsExpression::setSpecialColumn( "$atlasfeatureid", feat->id() );
@@ -3581,7 +3581,7 @@ void QgsComposer::updateAtlasMapLayerAction( QgsVectorLayer *coverageLayer )
   {
     mAtlasFeatureAction = new QgsMapLayerAction( QString( tr( "Set as atlas feature for %1" ) ).arg( mTitle ), this, coverageLayer, QgsMapLayerAction::SingleFeature );
     QgsMapLayerActionRegistry::instance()->addMapLayerAction( mAtlasFeatureAction );
-    connect( mAtlasFeatureAction, SIGNAL( triggeredForFeature( QgsMapLayer*, QgsFeature* ) ), this, SLOT( setAtlasFeature( QgsMapLayer*, QgsFeature* ) ) );
+    connect( mAtlasFeatureAction, SIGNAL( triggeredForFeature( QgsMapLayer*, const QgsFeature* ) ), this, SLOT( setAtlasFeature( QgsMapLayer*, const QgsFeature* ) ) );
   }
 }
 
@@ -3626,7 +3626,7 @@ void QgsComposer::updateAtlasMapLayerAction( bool atlasEnabled )
     QgsAtlasComposition& atlas = mComposition->atlasComposition();
     mAtlasFeatureAction = new QgsMapLayerAction( QString( tr( "Set as atlas feature for %1" ) ).arg( mTitle ), this, atlas.coverageLayer(), QgsMapLayerAction::SingleFeature );
     QgsMapLayerActionRegistry::instance()->addMapLayerAction( mAtlasFeatureAction );
-    connect( mAtlasFeatureAction, SIGNAL( triggeredForFeature( QgsMapLayer*, QgsFeature* ) ), this, SLOT( setAtlasFeature( QgsMapLayer*, QgsFeature* ) ) );
+    connect( mAtlasFeatureAction, SIGNAL( triggeredForFeature( QgsMapLayer*, const QgsFeature* ) ), this, SLOT( setAtlasFeature( QgsMapLayer*, const QgsFeature* ) ) );
   }
 }
 

src/app/composer/qgscomposer.h

@@ -620,7 +620,7 @@ class QgsComposer: public QMainWindow, private Ui::QgsComposerBase
 
     //! Sets the specified feature as the current atlas feature
     //! @note added in 2.1
-    void setAtlasFeature( QgsMapLayer* layer, QgsFeature * feat );
+    void setAtlasFeature( QgsMapLayer* layer, const QgsFeature *feat );
 
     //! Updates the "set as atlas feature" map layer action when atlas coverage layer changes
     void updateAtlasMapLayerAction( QgsVectorLayer* coverageLayer );

src/core/composer/qgsatlascomposition.cpp

@@ -333,13 +333,19 @@ void QgsAtlasComposition::lastFeature()
   prepareForFeature( mFeatureIds.size() - 1 );
 }
 
-bool QgsAtlasComposition::prepareForFeature( QgsFeature * feat )
+bool QgsAtlasComposition::prepareForFeature( const QgsFeature * feat )
 {
   int featureI = mFeatureIds.indexOf( feat->id() );
+  if ( featureI < 0 )
+  {
+    //feature not found
+    return false;
+  }
+
   return prepareForFeature( featureI );
 }
 
-bool QgsAtlasComposition::prepareForFeature( int featureI )
+bool QgsAtlasComposition::prepareForFeature( const int featureI )
 {
   if ( !mCoverageLayer )
   {

src/core/composer/qgsatlascomposition.h

@@ -205,12 +205,12 @@ class CORE_EXPORT QgsAtlasComposition : public QObject
     /**Prepare the atlas map for the given feature. Sets the extent and context variables
      * @returns true if feature was successfully prepared
     */
-    bool prepareForFeature( int i );
+    bool prepareForFeature( const int i );
 
     /**Prepare the atlas map for the given feature. Sets the extent and context variables
      * @returns true if feature was successfully prepared
     */
-    bool prepareForFeature( QgsFeature * feat );
+    bool prepareForFeature( const QgsFeature *feat );
 
     /** Returns the current filename. Must be called after prepareForFeature( i ) */
     const QString& currentFilename() const;