Manually calculate viewport update rect on header hover change

BUG: 340343

kstyle/animations/breezeheaderviewdata.cpp

@@ -47,6 +47,7 @@
 #include "breezeheaderviewdata.moc"
 
 #include <QHoverEvent>
+#include <QTextStream>
 
 namespace Breeze
 {
@@ -56,8 +57,6 @@ namespace Breeze
         AnimationData( parent, target )
     {
 
-        target->installEventFilter( this );
-
         _current._animation = new Animation( duration, this );
         setupAnimation( currentIndexAnimation(), "currentOpacity" );
         currentIndexAnimation().data()->setDirection( Animation::Forward );
@@ -77,7 +76,7 @@ namespace Breeze
         const QHeaderView* local( qobject_cast<const QHeaderView*>( target().data() ) );
         if( !local ) return false;
 
-        int index( local->logicalIndexAt( position ) );
+        const int index( local->logicalIndexAt( position ) );
         if( index < 0 ) return false;
 
         if( hovered )
@@ -146,4 +145,29 @@ namespace Breeze
 
     }
 
+
+    //__________________________________________________________
+    void HeaderViewData::setDirty( void ) const
+    {
+        QHeaderView* header = qobject_cast<QHeaderView*>( target().data() );
+        if( !header ) return;
+
+        // get first and last index, sorted
+        const int lastIndex( qMax( previousIndex(), currentIndex() ) );
+        if( lastIndex < 0 ) return;
+
+        int firstIndex( qMin( previousIndex(), currentIndex() ) );
+        if( firstIndex < 0 ) firstIndex = lastIndex;
+
+        // find relevant rectangle to be updated, in viewport coordinate
+        QWidget* viewport( header->viewport() );
+        const int left = header->sectionViewportPosition( firstIndex );
+        const int right = header->sectionViewportPosition( lastIndex ) + header->sectionSize( lastIndex );
+
+        // trigger update
+        if( header->orientation() == Qt::Horizontal ) viewport->update( left, 0, right-left, header->height() );
+        else viewport->update( 0, left, header->width(), right-left );
+
+    }
+
 }

kstyle/animations/breezeheaderviewdata.h

@@ -124,7 +124,7 @@ namespace Breeze
         protected:
 
         //* dirty
-        inline virtual void setDirty( void ) const;
+        virtual void setDirty( void ) const;
 
         private:
 
@@ -152,20 +152,6 @@ namespace Breeze
 
     };
 
-
-    //__________________________________________________________
-    void HeaderViewData::setDirty( void ) const
-    {
-        if( QHeaderView* header = qobject_cast<QHeaderView*>( target().data() ) )
-        {
-            const int firstIndex( qMin( previousIndex(), currentIndex() ) );
-            const int lastIndex( qMax( previousIndex(), currentIndex() ) );
-            if( firstIndex >= 0 ) header->headerDataChanged( header->orientation(), firstIndex, lastIndex );
-            else if( lastIndex >= 0 ) header->headerDataChanged( header->orientation(), lastIndex, lastIndex );
-        }
-    }
-
-
 }
 
 #endif