private Rect getProperArrangeRect(UIElement element)
{
Rect arrangeRect = element.PreviousArrangeRect;
// ELements without a parent (top level) get Arrange at DesiredSize
// if they were measured "to content" (as infinity indicates).
// If we arrange the element that is temporarily disconnected
// so it is not a top-level one, the assumption is that it will be
// layout-invalidated and/or recomputed by the parent when reconnected.
if (element.GetUIParentNo3DTraversal() == null)
{
arrangeRect.X = arrangeRect.Y = 0;
if (double.IsPositiveInfinity(element.PreviousConstraint.Width))
{
arrangeRect.Width = element.DesiredSize.Width;
}
if (double.IsPositiveInfinity(element.PreviousConstraint.Height))
{
arrangeRect.Height = element.DesiredSize.Height;
}
}
return(arrangeRect);
}
private void markTreeDirty(UIElement e)
{
//walk up until we are the topmost UIElement in the tree.
while(true)
{
UIElement p = e.GetUIParentNo3DTraversal() as UIElement;
if(p == null) break;
e = p;
}
markTreeDirtyHelper(e);
MeasureQueue.Add(e);
ArrangeQueue.Add(e);
}
private void markTreeDirty(UIElement e)
{
//walk up until we are the topmost UIElement in the tree.
while (true)
{
UIElement p = e.GetUIParentNo3DTraversal() as UIElement;
if (p == null)
{
break;
}
e = p;
}
markTreeDirtyHelper(e);
MeasureQueue.Add(e);
ArrangeQueue.Add(e);
}
private Rect getProperArrangeRect(UIElement element)
{
Rect arrangeRect = element.PreviousArrangeRect;
// ELements without a parent (top level) get Arrange at DesiredSize
// if they were measured "to content" (as infinity indicates).
// If we arrange the element that is temporarily disconnected
// so it is not a top-level one, the assumption is that it will be
// layout-invalidated and/or recomputed by the parent when reconnected.
if (element.GetUIParentNo3DTraversal() == null)
{
arrangeRect.X = arrangeRect.Y = 0;
if (double.IsPositiveInfinity(element.PreviousConstraint.Width))
arrangeRect.Width = element.DesiredSize.Width;
if (double.IsPositiveInfinity(element.PreviousConstraint.Height))
arrangeRect.Height = element.DesiredSize.Height;
}
return arrangeRect;
}