Refresh map list in composer table widget in showEvent. Ticket #4496

src/app/composer/qgscomposertablewidget.cpp

@@ -47,8 +47,35 @@ QgsComposerTableWidget::QgsComposerTableWidget( QgsComposerAttributeTable* table
     }
   }
 
-  //insert composer maps into combo
-  mLayerComboBox->blockSignals( true );
+  refreshMapComboBox();
+
+  updateGuiElements();
+  on_mComposerMapComboBox_activated( mComposerMapComboBox->currentIndex() );
+
+  if ( mComposerTable )
+  {
+    QObject::connect( mComposerTable, SIGNAL( maximumNumerOfFeaturesChanged( int ) ), this, SLOT( setMaximumNumberOfFeatures( int ) ) );
+    QObject::connect( mComposerTable, SIGNAL( itemChanged ), this, SLOT( updateGuiElements() ) );
+  }
+}
+
+QgsComposerTableWidget::~QgsComposerTableWidget()
+{
+
+}
+
+void QgsComposerTableWidget::showEvent( QShowEvent* event )
+{
+  refreshMapComboBox();
+}
+
+void QgsComposerTableWidget::refreshMapComboBox()
+{
+  //save the current entry in case it is still present after refresh
+  QString saveCurrentComboText = mComposerMapComboBox->currentText();
+
+  mComposerMapComboBox->blockSignals( true );
+  mComposerMapComboBox->clear();
   if ( mComposerTable )
   {
     const QgsComposition* tableComposition = mComposerTable->composition();
@@ -63,21 +90,18 @@ QgsComposerTableWidget::QgsComposerTableWidget( QgsComposerAttributeTable* table
       }
     }
   }
-  mLayerComboBox->blockSignals( false );
+  mComposerMapComboBox->blockSignals( false );
 
-  updateGuiElements();
-  on_mComposerMapComboBox_activated( mComposerMapComboBox->currentIndex() );
-
-  if ( mComposerTable )
+  if ( mComposerMapComboBox->findText( saveCurrentComboText ) == -1 )
   {
-    QObject::connect( mComposerTable, SIGNAL( maximumNumerOfFeaturesChanged( int ) ), this, SLOT( setMaximumNumberOfFeatures( int ) ) );
-    QObject::connect( mComposerTable, SIGNAL( itemChanged ), this, SLOT( updateGuiElements() ) );
+    //the former entry is no longer present. Inform the scalebar about the changed composer map
+    on_mComposerMapComboBox_activated( mComposerMapComboBox->currentIndex() );
+  }
+  else
+  {
+    //the former entry is still present. Make it the current entry again
+    mComposerMapComboBox->setCurrentIndex( mComposerMapComboBox->findText( saveCurrentComboText ) );
   }
-}
-
-QgsComposerTableWidget::~QgsComposerTableWidget()
-{
-
 }
 
 void QgsComposerTableWidget::on_mLayerComboBox_currentIndexChanged( int index )

src/app/composer/qgscomposertablewidget.h

@@ -29,11 +29,15 @@ class QgsComposerTableWidget: public QWidget, private Ui::QgsComposerTableWidget
     QgsComposerTableWidget( QgsComposerAttributeTable* table );
     ~QgsComposerTableWidget();
 
+  protected:
+    void showEvent( QShowEvent * event );
+
   private:
     QgsComposerAttributeTable* mComposerTable;
 
     /**Blocks / unblocks the signals of all GUI elements*/
     void blockAllSignals( bool b );
+    void refreshMapComboBox();
 
   private slots:
     void on_mLayerComboBox_currentIndexChanged( int index );