[composer] Composer items which set their own size must consider data defined width and height

python/core/composer/qgscomposeritem.sip

@@ -660,6 +660,9 @@ class QgsComposerItem : QObject, QGraphicsRectItem
     */
     bool dataDefinedEvaluate( QgsComposerItem::DataDefinedProperty property, QVariant &expressionValue );
 
+    /**Update an item rect to consider data defined position and size of item*/
+    QRectF evalItemRect( const QRectF &newRect );
+
   signals:
     /**Is emitted on item rotation change*/
     void itemRotationChanged( double newRotation );

src/core/composer/qgscomposerarrow.cpp

@@ -113,11 +113,14 @@ void QgsComposerArrow::paint( QPainter* painter, const QStyleOptionGraphicsItem
 
 void QgsComposerArrow::setSceneRect( const QRectF& rectangle )
 {
-  if ( rectangle.width() < 0 )
+  //update rect for data defined size and position
+  QRectF evaluatedRect = evalItemRect( rectangle );
+
+  if ( evaluatedRect.width() < 0 )
   {
     mStartXIdx = 1 - mStartXIdx;
   }
-  if ( rectangle.height() < 0 )
+  if ( evaluatedRect.height() < 0 )
   {
     mStartYIdx = 1 - mStartYIdx;
   }
@@ -125,7 +128,7 @@ void QgsComposerArrow::setSceneRect( const QRectF& rectangle )
   double margin = computeMarkerMargin();
 
   // Ensure the rectangle is at least as large as needed to include the markers
-  QRectF rect = rectangle.united( QRectF( rectangle.x(), rectangle.y(), 2. * margin, 2. * margin ) );
+  QRectF rect = rectangle.united( QRectF( evaluatedRect.x(), evaluatedRect.y(), 2. * margin, 2. * margin ) );
 
   // Compute new start and stop positions
   double x[2] = {rect.x(), rect.x() + rect.width()};

src/core/composer/qgscomposerattributetable.cpp

@@ -481,17 +481,20 @@ void QgsComposerAttributeTable::removeLayer( QString layerId )
 
 void QgsComposerAttributeTable::setSceneRect( const QRectF& rectangle )
 {
+  //update rect for data defined size and position
+  QRectF evaluatedRect = evalItemRect( rectangle );
+
   double titleHeight =  2 * mGridStrokeWidth + 2 * mLineTextDistance + fontAscentMillimeters( mHeaderFont );
   double attributeHeight = mGridStrokeWidth + 2 * mLineTextDistance + fontAscentMillimeters( mContentFont );
-  if (( rectangle.height() - titleHeight ) > 0 )
+  if (( evaluatedRect.height() - titleHeight ) > 0 )
   {
-    mMaximumNumberOfFeatures = ( rectangle.height() - titleHeight ) / attributeHeight;
+    mMaximumNumberOfFeatures = ( evaluatedRect.height() - titleHeight ) / attributeHeight;
   }
   else
   {
     mMaximumNumberOfFeatures = 0;
   }
-  QgsComposerItem::setSceneRect( rectangle );
+  QgsComposerItem::setSceneRect( evaluatedRect );
 
   //refresh table attributes, since number of features has likely changed
   refreshAttributes();

src/core/composer/qgscomposeritem.h

@@ -668,6 +668,9 @@ class CORE_EXPORT QgsComposerItem: public QObject, public QGraphicsRectItem
     */
     bool dataDefinedEvaluate( QgsComposerItem::DataDefinedProperty property, QVariant &expressionValue );
 
+    /**Update an item rect to consider data defined position and size of item*/
+    QRectF evalItemRect( const QRectF &newRect );
+
   signals:
     /**Is emitted on item rotation change*/
     void itemRotationChanged( double newRotation );
@@ -697,9 +700,6 @@ class CORE_EXPORT QgsComposerItem: public QObject, public QGraphicsRectItem
     /**Map of current data defined properties*/
     QMap< QgsComposerItem::DataDefinedProperty, QgsDataDefined* > mDataDefinedProperties;
 
-    /**Update an item rect to consider data defined position and size of item*/
-    QRectF evalItemRect( const QRectF &newRect );
-
     /**Refresh item's rotation, considering data defined rotation setting
       *@param updateItem set to false to prevent the item being automatically updated
       *@param rotateAroundCenter set to true to rotate the item around its center rather

src/core/composer/qgscomposerlabel.cpp

@@ -272,7 +272,9 @@ void QgsComposerLabel::adjustSizeToText()
   double yShift = 0;
   itemShiftAdjustSize( width, height, xShift, yShift );
 
-  setSceneRect( QRectF( pos().x() + xShift, pos().y() + yShift, width, height ) );
+  //update rect for data defined size and position
+  QRectF evaluatedRect = evalItemRect( QRectF( pos().x() + xShift, pos().y() + yShift, width, height ) );
+  setSceneRect( evaluatedRect );
 }
 
 QFont QgsComposerLabel::font() const

src/core/composer/qgscomposerscalebar.cpp

@@ -382,7 +382,9 @@ void QgsComposerScaleBar::adjustBoxSize()
   }
 
   QRectF box = mStyle->calculateBoxSize();
-  setSceneRect( box );
+
+  //update rect for data defined size and position
+  setSceneRect( evalItemRect( box ) );
 }
 
 void QgsComposerScaleBar::update()

src/core/composer/qgscomposershape.cpp

@@ -415,7 +415,11 @@ void QgsComposerShape::updateBoundingRect()
 void QgsComposerShape::setSceneRect( const QRectF& rectangle )
 {
   // Reimplemented from QgsComposerItem as we need to call updateBoundingRect after the shape's size changes
-  QgsComposerItem::setSceneRect( rectangle );
+
+  //update rect for data defined size and position
+  QRectF evaluatedRect = evalItemRect( rectangle );
+  QgsComposerItem::setSceneRect( evaluatedRect );
+
   updateBoundingRect();
   update();
 }

src/core/composer/qgscomposertable.cpp

@@ -368,7 +368,10 @@ void QgsComposerTable::adaptItemFrame( const QMap<int, double>& maxWidthMap, con
   totalWidth += ( 2 * maxWidthMap.size() * mLineTextDistance );
   totalWidth += ( maxWidthMap.size() + 1 ) * mGridStrokeWidth;
 
-  QgsComposerItem::setSceneRect( QRectF( pos().x(), pos().y(), totalWidth, totalHeight ) );
+  QRectF evaluatedRect = evalItemRect( QRectF( pos().x(), pos().y(), totalWidth, totalHeight ) );
+
+  //update rect for data defined size and position
+  QgsComposerItem::setSceneRect( evaluatedRect );
 }
 
 void QgsComposerTable::drawHorizontalGridLines( QPainter* p, int nAttributes )