void CWsBackedUpWindow::Scroll(const TRect &aClipRect, const TPoint &aOffset,const TRect &aRect)
{
TRect winBorder=TRect(iWsWin->Size());
TRect clipRect=aClipRect;
TRect srcRect = aRect;
clipRect.Intersection(winBorder);
if (!clipRect.IsEmpty())
{ // If we have to do something (a visible part will change)
srcRect.Intersection(clipRect);
STACK_REGION regionToClear;
regionToClear.AddRect(aRect);
regionToClear.SubRect(srcRect);
regionToClear.Offset(aOffset);
ActivateGc();
iBitGc->SetClippingRect(clipRect);
iBitGc->SetDrawMode(CGraphicsContext::EDrawModeWriteAlpha);
iBitGc->CopyRect(aOffset,srcRect);
for (TInt k=0;k<regionToClear.Count();k++)
{
iBitGc->Clear(regionToClear[k]);
}
iBitGc->SetClippingRect(winBorder);
iBitGc->SetDrawMode(CGraphicsContext::EDrawModePEN);
TRegionFix<1> fixRegion(iWsWin->AbsRect());
UpdateScreen(fixRegion);
regionToClear.Close();
}
}
/**
This function selects the desired behaviour depending on whether the screen is
run in CHANGETRACKING mode or not.
@param aRegion in screen coordinates
*/
void CWsBackedUpWindow::UpdateScreen(const TRegion& aRegion)
{
if (Screen()->ChangeTracking())
{
STACK_REGION region;
region.Copy(aRegion);
region.Offset(-WsWin()->Origin()); //convert to window coordinates
MarkDirtyAndSchedule(region);
region.Close();
}
else
{
Screen()->AddRedrawRegion(aRegion);
}
}
