Skip to content

Port fix for VSP floating-point hang from 4.8 #4979

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 1 commit into from
Aug 17, 2021
Merged

Port fix for VSP floating-point hang from 4.8 #4979

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
49 changes: 30 additions & 19 deletions ...ft.DotNet.Wpf/src/PresentationFramework/System/Windows/Controls/VirtualizingStackPanel.cs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -931,16 +931,19 @@ private void OnAnchorOperation(bool isAnchorOperationPending)
// situations where the viewport size has changed)
if (!success)
{
double computedOffset, maxOffset;
if (isHorizontal)
{
success = DoubleUtil.GreaterThanOrClose(_scrollData._computedOffset.X,
_scrollData._extent.Width - _scrollData._viewport.Width);
computedOffset = _scrollData._computedOffset.X;
maxOffset = _scrollData._extent.Width - _scrollData._viewport.Width;
}
else
{
success = DoubleUtil.GreaterThanOrClose(_scrollData._computedOffset.Y,
_scrollData._extent.Height - _scrollData._viewport.Height);
computedOffset = _scrollData._computedOffset.Y;
maxOffset = _scrollData._extent.Height - _scrollData._viewport.Height;
}
success = LayoutDoubleUtil.LessThan(maxOffset, computedOffset) ||
LayoutDoubleUtil.AreClose(maxOffset, computedOffset);
}
}
}
Expand Down Expand Up @@ -973,21 +976,22 @@ private void OnAnchorOperation(bool isAnchorOperationPending)
else
{
bool remeasure = false;
double actualOffset, expectedOffset;
double actualOffset, expectedOffset, maxOffset;

if (isHorizontal)
{
_scrollData._computedOffset.X = prevFirstContainerOffset - prevFirstContainerOffsetFromViewport;

actualOffset = _scrollData._computedOffset.X + actualDistanceBetweenViewports;
expectedOffset = _scrollData._computedOffset.X + _scrollData._expectedDistanceBetweenViewports;
maxOffset = _scrollData._extent.Width - _scrollData._viewport.Width;

if (DoubleUtil.LessThan(expectedOffset, 0) || DoubleUtil.GreaterThan(expectedOffset, _scrollData._extent.Width - _scrollData._viewport.Width))
if (LayoutDoubleUtil.LessThan(expectedOffset, 0) || LayoutDoubleUtil.LessThan(maxOffset, expectedOffset))
{
// the condition can fail due to estimated sizes in subtrees that contribute
// to FindScrollOffset(_scrollData._firstContainerInViewport) but not to
// _scrollData._extent. If that happens, remeasure.
if (DoubleUtil.AreClose(actualOffset, 0) || DoubleUtil.AreClose(actualOffset, _scrollData._extent.Width - _scrollData._viewport.Width))
if (LayoutDoubleUtil.AreClose(actualOffset, 0) || LayoutDoubleUtil.AreClose(actualOffset, maxOffset))
{
_scrollData._computedOffset.X = actualOffset;
_scrollData._offset.X = actualOffset;
Expand All @@ -1010,13 +1014,14 @@ private void OnAnchorOperation(bool isAnchorOperationPending)

actualOffset = _scrollData._computedOffset.Y + actualDistanceBetweenViewports;
expectedOffset = _scrollData._computedOffset.Y + _scrollData._expectedDistanceBetweenViewports;
maxOffset = _scrollData._extent.Height - _scrollData._viewport.Height;

if (DoubleUtil.LessThan(expectedOffset, 0) || DoubleUtil.GreaterThan(expectedOffset, _scrollData._extent.Height - _scrollData._viewport.Height))
if (LayoutDoubleUtil.LessThan(expectedOffset, 0) || LayoutDoubleUtil.LessThan(maxOffset, expectedOffset))
{
// the condition can fail due to estimated sizes in subtrees that contribute
// to FindScrollOffset(_scrollData._firstContainerInViewport) but not to
// _scrollData._extent. If that happens, remeasure.
if (DoubleUtil.AreClose(actualOffset, 0) || DoubleUtil.AreClose(actualOffset, _scrollData._extent.Height - _scrollData._viewport.Height))
if (LayoutDoubleUtil.AreClose(actualOffset, 0) || LayoutDoubleUtil.AreClose(actualOffset, maxOffset))
{
_scrollData._computedOffset.Y = actualOffset;
_scrollData._offset.Y = actualOffset;
Expand Down Expand Up @@ -2824,11 +2829,11 @@ private Size MeasureOverrideImpl(Size constraint,
ref scrollGeneration);

if (ItemsChangedDuringMeasure)
{
// if the Items collection changed, our state is now invalid. Start over.
remeasure = true;
goto EscapeMeasure;
}
{
// if the Items collection changed, our state is now invalid. Start over.
remeasure = true;
goto EscapeMeasure;
}
}
}

Expand Down Expand Up @@ -2873,11 +2878,11 @@ private Size MeasureOverrideImpl(Size constraint,
ref scrollGeneration);

if (ItemsChangedDuringMeasure)
{
// if the Items collection changed, our state is now invalid. Start over.
remeasure = true;
goto EscapeMeasure;
}
{
// if the Items collection changed, our state is now invalid. Start over.
remeasure = true;
goto EscapeMeasure;
}
}
}

Expand Down Expand Up @@ -12321,6 +12326,12 @@ private void IdentifyTrace(ItemsControl ic, VirtualizingStackPanel vsp)
"ScrollUnit:", VirtualizingPanel.GetScrollUnit(ic),
"CacheLen:", VirtualizingPanel.GetCacheLength(ic), VirtualizingPanel.GetCacheLengthUnit(ic));

DpiScale dpiScale = vsp.GetDpi();
AddTrace(null, ScrollTraceOp.ID, _nullInfo,
"DPIScale:", dpiScale.DpiScaleX, dpiScale.DpiScaleY,
"UseLayoutRounding:", vsp.UseLayoutRounding,
"Rounding Quantum:", 1.0/dpiScale.DpiScaleY);

AddTrace(null, ScrollTraceOp.ID, _nullInfo,
"CanContentScroll:", ScrollViewer.GetCanContentScroll(ic),
"IsDeferredScrolling:", ScrollViewer.GetIsDeferredScrollingEnabled(ic),
Expand Down