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Mac: fix repaint artifacts introduced by issue #360 when overlapping elements are scrolled.

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git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@319 5089003a-bbd8-11dd-ad1f-f1f9622dbc98
This commit is contained in:
Marshall Greenblatt
2011-10-18 00:06:44 +00:00
parent 9c6dcab73a
commit 78c23fc30b
1 changed files with 12 additions and 2 deletions
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14
libcef/webwidget_host_mac.mm
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@ -61,8 +61,8 @@ void WebWidgetHost::DidInvalidateRect(const gfx::Rect& damaged_rect) {
void WebWidgetHost::DidScrollRect(int dx, int dy, const gfx::Rect& clip_rect) {
DCHECK(dx || dy);
gfx::Rect client_rect(NSRectToCGRect([view_ bounds]));
gfx::Rect rect = clip_rect.Intersect(client_rect);
const gfx::Rect client_rect(NSRectToCGRect([view_ bounds]));
const gfx::Rect rect = clip_rect.Intersect(client_rect);
// Convert scroll rectangle to the view's coordinate system, and perform the
// scroll directly, without invalidating the view. In theory this could cause
@ -105,6 +105,16 @@ void WebWidgetHost::DidScrollRect(int dx, int dy, const gfx::Rect& clip_rect) {
paint_rect_ = gfx::Rect(rect.x(), rect.y() + dy, rect.width(), -dx);
Paint();
// If any part of the scrolled rect was marked as dirty, make sure to redraw
// it in the new scrolled-to location. Otherwise we can end up with artifacts
// for overlapping elements.
gfx::Rect moved_paint_rect = saved_paint_rect.Intersect(clip_rect);
if (!moved_paint_rect.IsEmpty()) {
moved_paint_rect.Offset(dx, dy);
paint_rect_ = moved_paint_rect;
Paint();
}
paint_rect_ = saved_paint_rect;
}