add matrixForElement(const QString& elementId) const as discussed on panel-devel

svn path=/trunk/KDE/kdebase/workspace/libs/plasma/; revision=695665

svg.cpp

@@ -177,10 +177,16 @@ class Svg::Private
             QSizeF naturalSize = renderer->defaultSize();
             qreal dx = size.width() / naturalSize.width();
             qreal dy = size.height() / naturalSize.height();
-
+            
             return QRect(elementRect.x() * dx, elementRect.y() * dy,
                          elementRect.width() * dx, elementRect.height() * dy);
         }
+    
+        QMatrix matrixForElement(const QString& elementId)
+        {
+            createRenderer();
+            return renderer->matrixForElement(elementId);
+        }
 
         static QHash<QString, SharedSvgRenderer::Ptr> renderers;
         SharedSvgRenderer::Ptr renderer;
@@ -261,6 +267,12 @@ bool Svg::elementExists(const QString& elementId) const
     return d->renderer->elementExists(elementId);
 }
 
+QMatrix Svg::matrixForElement(const QString& elementId) const
+{
+    d->createRenderer();
+    return d->renderer->matrixForElement(elementId);
+}
+
 bool Svg::isValid() const
 {
     d->createRenderer();

svg.h

@@ -30,6 +30,7 @@ class QRect;
 class QRectF;
 class QSize;
 class QSizeF;
+class QMatrix;
 
 namespace Plasma
 {
@@ -156,6 +157,14 @@ class PLASMA_EXPORT Svg : public QObject
          **/
         Q_INVOKABLE bool elementExists( const QString& elementId ) const;
 
+        /**
+         * The transformation matrix of the element. That includes the 
+         * transformation on the element itself.
+         * @arg elementId the id of the element
+         * @return the matrix for the element
+         **/
+        Q_INVOKABLE QMatrix matrixForElement(const QString& elementId) const;
+        
         /**
          * @return true if the SVG file exists and the document is valid,
          *         otherwise false. This method can be expensive as it