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Bug 397641, AsyncScrollPortEvent posted even if overflow/underflow event won't be dispatched r=mats+roc, sr=mats, a=roc

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git-svn-id: svn://10.0.0.236/trunk@237398 18797224-902f-48f8-a5cc-f745e15eee43
This commit is contained in:
Olli.Pettay%helsinki.fi
2007-10-08 08:42:43 +00:00
parent 73881e0c65
commit 0e4ff6afd5
1 changed files with 17 additions and 2 deletions
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19
mozilla/layout/generic/nsGfxScrollFrame.cpp
View File

@@ -651,8 +651,6 @@ nsHTMLScrollFrame::PlaceScrollArea(const ScrollReflowState& aState)
scrolledView,
&scrolledArea,
NS_FRAME_NO_MOVE_VIEW);
mInner.PostOverflowEvent();
}
/* virtual */ nscoord
@@ -794,6 +792,7 @@ nsHTMLScrollFrame::Reflow(nsPresContext* aPresContext,
aStatus = NS_FRAME_COMPLETE;
NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
mInner.PostOverflowEvent();
return rv;
}
@@ -1497,6 +1496,8 @@ nsresult
nsGfxScrollFrameInner::FireScrollPortEvent()
{
mAsyncScrollPortEvent.Forget();
// Keep this in sync with PostOverflowEvent().
nsSize scrollportSize = GetScrollPortSize();
nsSize childSize = GetScrolledRect(scrollportSize).Size();
@@ -2043,6 +2044,20 @@ void nsGfxScrollFrameInner::PostOverflowEvent()
if (mAsyncScrollPortEvent.IsPending())
return;
// Keep this in sync with FireScrollPortEvent().
nsSize scrollportSize = GetScrollPortSize();
nsSize childSize = GetScrolledRect(scrollportSize).Size();
PRBool newVerticalOverflow = childSize.height > scrollportSize.height;
PRBool vertChanged = mVerticalOverflow != newVerticalOverflow;
PRBool newHorizontalOverflow = childSize.width > scrollportSize.width;
PRBool horizChanged = mHorizontalOverflow != newHorizontalOverflow;
if (!vertChanged && !horizChanged) {
return;
}
nsRefPtr<AsyncScrollPortEvent> ev = new AsyncScrollPortEvent(this);
if (NS_SUCCEEDED(NS_DispatchToCurrentThread(ev)))
mAsyncScrollPortEvent = ev;