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fix shearing during scrolling in embedding apps on 10.2 (r=ccarlen/sr=sfraser) bug 162885

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This commit is contained in:
pinkerton%netscape.com 2002-08-23 20:00:00 +00:00
parent d6a0cf409a
commit 33e9cb62fa
1 changed files with 13 additions and 6 deletions
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19
widget/src/mac/nsWindow.cpp
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@ -2166,12 +2166,19 @@ void nsWindow::CalcWindowRegions()
{
while (parent && (!parent->mIsTopWidgetWindow))
{
if (parent->mWindowRegion)
{
::OffsetRgn(parent->mWindowRegion, origin.x, origin.y);
::SectRgn(mWindowRegion, parent->mWindowRegion, mWindowRegion);
::OffsetRgn(parent->mWindowRegion, -origin.x, -origin.y);
}
if (parent->mWindowRegion)
{
// Under 10.2, if we offset a region beyond the coordinate space,
// OffsetRgn() will silently fail and restoring it will then cause the
// widget to be out of place (visible as 'shearing' when scrolling).
// To prevent that, we copy the original region and work on that. (bug 162885)
StRegionFromPool shiftedParentWindowRgn;
if ( !shiftedParentWindowRgn )
return;
::CopyRgn(parent->mWindowRegion, shiftedParentWindowRgn);
::OffsetRgn(shiftedParentWindowRgn, origin.x, origin.y);
::SectRgn(mWindowRegion, shiftedParentWindowRgn, mWindowRegion);
}
origin.x -= parent->mBounds.x;
origin.y -= parent->mBounds.y;
parent = (nsWindow*)parent->mParent;