public void Measure(Size availableSize)
{
using (Dispatcher.CurrentDispatcher.DisableProcessing())
{
using (DisableMeasureInvalidation())
{
if (Visibility == Visibility.Collapsed)
{
DesiredSize = Size.Zero;
}
else if (IsMeasureValid && PreviousAvailableSize.IsClose(availableSize))
{
DesiredSize = previousDesiredSize;
}
else
{
DesiredSize = MeasureCore(availableSize);
PreviousAvailableSize = availableSize;
previousDesiredSize = DesiredSize;
}
IsMeasureValid = true;
LayoutManager.Current.RemoveMeasure(this);
}
}
}
public void Arrange(Rect finalRect)
{
using (Dispatcher.CurrentDispatcher.DisableProcessing())
{
using (DisableMeasureInvalidation())
{
if (Visibility == Visibility.Collapsed)
{
LayoutManager.Current.RemoveArrange(this);
return;
}
if (IsArrangeValid && finalRect.IsClose(PreviousFinalRect))
{
LayoutManager.Current.RemoveArrange(this);
return;
}
if (!IsMeasureValid || !PreviousAvailableSize.IsClose(finalRect.Size))
{
Measure(finalRect.Size);
}
ArrangeCore(finalRect);
PreviousFinalRect = finalRect;
IsArrangeValid = true;
LayoutManager.Current.RemoveArrange(this);
LayoutManager.Current.AddUpdatedElement(this);
}
}
}
