[FEATURE] Added possibility to keep the current layers in a composer map even if further layers are added to the main map

git-svn-id: http://svn.osgeo.org/qgis/trunk@10963 c8812cc2-4d05-0410-92ff-de0c093fc19c

Author: mhugent

src/app/composer/qgscomposermapwidget.cpp

@@ -252,6 +252,18 @@ void QgsComposerMapWidget::updateGuiElements()
     mXMaxLineEdit->setText( QString::number( composerMapExtent.xMaximum(), 'f', 3 ) );
     mYMinLineEdit->setText( QString::number( composerMapExtent.yMinimum(), 'f', 3 ) );
     mYMaxLineEdit->setText( QString::number( composerMapExtent.yMaximum(), 'f', 3 ) );
+
+    //keep layer list check box
+    mKeepLayerListCheckBox->blockSignals(true);
+    if(mComposerMap->keepLayerSet())
+    {
+      mKeepLayerListCheckBox->setCheckState(Qt::Checked);
+    }
+    else
+    {
+      mKeepLayerListCheckBox->setCheckState(Qt::Unchecked);
+    }
+    mKeepLayerListCheckBox->blockSignals(false);
   }
 }
 
@@ -298,3 +310,23 @@ void QgsComposerMapWidget::on_mUpdatePreviewButton_clicked()
 
   mUpdatePreviewButton->setEnabled( true );
 }
+
+void QgsComposerMapWidget::on_mKeepLayerListCheckBox_stateChanged(int state)
+{
+  if(!mComposerMap)
+  {
+    return;
+  }
+
+  if(state == Qt::Checked)
+  {
+    mComposerMap->storeCurrentLayerSet();
+    mComposerMap->setKeepLayerSet(true);
+  }
+  else
+  {
+    QStringList emptyLayerSet;
+    mComposerMap->setLayerSet(emptyLayerSet);
+    mComposerMap->setKeepLayerSet(false);
+  }
+}

src/app/composer/qgscomposermapwidget.h

@@ -41,6 +41,7 @@ class QgsComposerMapWidget: public QWidget, private Ui::QgsComposerMapWidgetBase
     void on_mScaleLineEdit_editingFinished();
     void on_mSetToMapCanvasExtentButton_clicked();
     void on_mUpdatePreviewButton_clicked();
+    void on_mKeepLayerListCheckBox_stateChanged(int state);
 
     void on_mXMinLineEdit_editingFinished();
     void on_mXMaxLineEdit_editingFinished();

src/core/composer/qgscomposermap.cpp

@@ -42,7 +42,7 @@
 int QgsComposerMap::mCurrentComposerId = 0;
 
 QgsComposerMap::QgsComposerMap( QgsComposition *composition, int x, int y, int width, int height )
-    : QgsComposerItem( x, y, width, height, composition )
+    : QgsComposerItem( x, y, width, height, composition ), mKeepLayerSet(false)
 {
   mComposition = composition;
   mMapRenderer = mComposition->mapRenderer();
@@ -69,7 +69,7 @@ QgsComposerMap::QgsComposerMap( QgsComposition *composition, int x, int y, int w
 }
 
 QgsComposerMap::QgsComposerMap( QgsComposition *composition )
-    : QgsComposerItem( 0, 0, 10, 10, composition )
+    : QgsComposerItem( 0, 0, 10, 10, composition ), mKeepLayerSet(false)
 {
   //Offset
   mXOffset = 0.0;
@@ -113,7 +113,16 @@ void QgsComposerMap::draw( QPainter *painter, const QgsRectangle& extent, const
   QgsMapRenderer theMapRenderer;
   theMapRenderer.setExtent( extent );
   theMapRenderer.setOutputSize( size, dpi );
-  theMapRenderer.setLayerSet( mMapRenderer->layerSet() );
+
+  //use stored layer set or read current set from main canvas
+  if(mKeepLayerSet)
+  {
+    theMapRenderer.setLayerSet(mLayerSet);
+  }
+  else
+  {
+    theMapRenderer.setLayerSet( mMapRenderer->layerSet() );
+  }
   theMapRenderer.setProjectionsEnabled( mMapRenderer->hasCrsTransformEnabled() );
   theMapRenderer.setDestinationSrs( mMapRenderer->destinationSrs() );
 
@@ -240,6 +249,7 @@ void QgsComposerMap::paint( QPainter* painter, const QStyleOptionGraphicsItem* i
 
 void QgsComposerMap::updateCachedImage( void )
 {
+  syncLayerSet(); //layer list may have changed
   mCacheUpdated = false;
   cache();
   QGraphicsRectItem::update();
@@ -489,6 +499,15 @@ bool QgsComposerMap::writeXML( QDomElement& elem, QDomDocument & doc ) const
     composerMapElem.setAttribute( "previewMode", "Rectangle" );
   }
 
+  if(mKeepLayerSet)
+  {
+    composerMapElem.setAttribute( "keepLayerSet", "true");
+  }
+  else
+  {
+    composerMapElem.setAttribute( "keepLayerSet", "false");
+  }
+
   //extent
   QDomElement extentElem = doc.createElement( "Extent" );
   extentElem.setAttribute( "xmin", QString::number( mExtent.xMinimum() ) );
@@ -497,6 +516,18 @@ bool QgsComposerMap::writeXML( QDomElement& elem, QDomDocument & doc ) const
   extentElem.setAttribute( "ymax", QString::number( mExtent.yMaximum() ) );
   composerMapElem.appendChild( extentElem );
 
+  //layer set
+  QDomElement layerSetElem = doc.createElement( "LayerSet" );
+  QStringList::const_iterator layerIt = mLayerSet.constBegin();
+  for(; layerIt != mLayerSet.constEnd(); ++layerIt)
+  {
+    QDomElement layerElem = doc.createElement( "Layer" );
+    QDomText layerIdText = doc.createTextNode(*layerIt);
+    layerElem.appendChild(layerIdText);
+    layerSetElem.appendChild(layerElem);
+  }
+  composerMapElem.appendChild(layerSetElem);
+
 #if 0
   // why is saving the map changing anything about the cache?
   mCacheUpdated = false;
@@ -545,6 +576,31 @@ bool QgsComposerMap::readXML( const QDomElement& itemElem, const QDomDocument& d
     mExtent = QgsRectangle( xmin, ymin, xmax, ymax );
   }
 
+  //mKeepLayerSet flag
+  QString keepLayerSetFlag = itemElem.attribute( "keepLayerSet" );
+  if(keepLayerSetFlag.compare("true", Qt::CaseInsensitive) == 0)
+  {
+    mKeepLayerSet = true;
+  }
+  else
+  {
+    mKeepLayerSet = false;
+  }
+
+  //mLayerSet
+  QDomNodeList layerSetNodeList = itemElem.elementsByTagName("LayerSet");
+  QStringList layerSet;
+  if(layerSetNodeList.size() > 0)
+  {
+    QDomElement layerSetElem = layerSetNodeList.at(0).toElement();
+    QDomNodeList layerIdNodeList = layerSetElem.elementsByTagName("Layer");
+    for(int i = 0; i < layerIdNodeList.size(); ++i)
+    {
+      layerSet << layerIdNodeList.at(i).toElement().text();
+    }
+  }
+  mLayerSet = layerSet;
+
   mDrawing = false;
   mNumCachedLayers = 0;
   mCacheUpdated = false;
@@ -565,3 +621,28 @@ bool QgsComposerMap::readXML( const QDomElement& itemElem, const QDomDocument& d
 
   return true;
 }
+
+void QgsComposerMap::storeCurrentLayerSet()
+{
+  if(mMapRenderer)
+  {
+    mLayerSet = mMapRenderer->layerSet();
+  }
+}
+
+void QgsComposerMap::syncLayerSet()
+{
+  if(mLayerSet.size() < 1 && !mMapRenderer)
+  {
+    return;
+  }
+
+  QStringList currentLayerSet = mMapRenderer->layerSet();
+  for(int i = mLayerSet.size() - 1; i >= 0; --i)
+  {
+    if(!currentLayerSet.contains(mLayerSet.at(i)))
+    {
+      mLayerSet.removeAt(i);
+    }
+  }
+}

src/core/composer/qgscomposermap.h

@@ -101,6 +101,22 @@ class CORE_EXPORT QgsComposerMap : /*public QWidget, private Ui::QgsComposerMapB
     PreviewMode previewMode() {return mPreviewMode;}
     void setPreviewMode( PreviewMode m ) {mPreviewMode = m;}
 
+    /**Getter for flag that determines if the stored layer set should be used or the current layer set of the qgis mapcanvas
+    @note this function was added in version 1.2*/
+    bool keepLayerSet() const {return mKeepLayerSet;}
+    /**Setter for flag that determines if the stored layer set should be used or the current layer set of the qgis mapcanvas
+    @note this function was added in version 1.2*/
+    void setKeepLayerSet(bool enabled) {mKeepLayerSet = enabled;}
+
+    /**Getter for stored layer set that is used if mKeepLayerSet is true
+    @note this function was added in version 1.2*/
+    QStringList layerSet() const {return mLayerSet;}
+    /**Setter for stored layer set that is used if mKeepLayerSet is true
+    @note this function was added in version 1.2*/
+    void setLayerSet(const QStringList& layerSet) {mLayerSet = layerSet;}
+    /**Stores the current layer set of the qgis mapcanvas in mLayerSet*/
+    void storeCurrentLayerSet();
+
     // Set cache outdated
     void setCacheUpdated( bool u = false );
 
@@ -176,11 +192,20 @@ class CORE_EXPORT QgsComposerMap : /*public QWidget, private Ui::QgsComposerMapB
     /**Offset in y direction for showing map cache image*/
     double mYOffset;
 
+    /**Flag if layers to be displayed should be read from qgis canvas (true) or from stored list in mLayerSet (false)*/
+    bool mKeepLayerSet;
+
+    /**Stored layer list (used if layer live-link mKeepLayerSet is disabled)*/
+    QStringList mLayerSet;
+
     /**For the generation of new unique ids*/
     static int mCurrentComposerId;
 
     /**Establishes signal/slot connection for update in case of layer change*/
     void connectUpdateSlot();
+
+    /**Removes layer ids from mLayerSet that are no longer present in the qgis main map*/
+    void syncLayerSet();
 };
 
 #endif