void GR_UnixCairoGraphics::scroll(UT_sint32 dx, UT_sint32 dy)
{
UT_sint32 oldDY = tdu(getPrevYOffset());
UT_sint32 oldDX = tdu(getPrevXOffset());
UT_sint32 newY = getPrevYOffset() + dy;
UT_sint32 newX = getPrevXOffset() + dx;
UT_sint32 ddx = -(tdu(newX) - oldDX);
UT_sint32 ddy = -(tdu(newY) - oldDY);
setPrevYOffset(newY);
setPrevXOffset(newX);
if(ddx == 0 && ddy == 0)
{
return;
}
disableAllCarets();
UT_sint32 iddy = labs(ddy);
bool bEnableSmooth = XAP_App::getApp()->isSmoothScrollingEnabled();
bEnableSmooth = bEnableSmooth && (iddy < 30) && (ddx == 0);
if(bEnableSmooth)
{
if(ddy < 0)
{
UT_sint32 i = 0;
for(i = 0; i< iddy; i++)
{
gdk_window_scroll(m_pWin,0,-1);
}
}
else
{
UT_sint32 i = 0;
for(i = 0; i< iddy; i++)
{
gdk_window_scroll(m_pWin,0,1);
}
}
}
else
{
gdk_window_scroll(m_pWin,ddx,ddy);
}
enableAllCarets();
}
/*!
* This method converts to device units while taking account of the Y-scroll
* offset. This will always give the exact same logical location on the screen
* no matter what the Y-scroll offset is. This fixes off-by-1-pixel bugs in Y.
*/
UT_sint32 GR_Graphics::_tduY(UT_sint32 layoutUnits) const
{
return tdu(layoutUnits+getPrevYOffset()) - tdu(getPrevYOffset());
}
