protected override Size MeasureOverride(Size availableSize)
{
arrageRects.Clear();
var requiredSize = new Size(Padding.Left + Padding.Right, Padding.Top + Padding.Bottom);
var clientSize = new Size(
availableSize.Width - Padding.Left - Padding.Right,
availableSize.Height - Padding.Top - Padding.Bottom);
if (Children.Count < 1)
{
return(requiredSize);
}
if (Orientation == Orientation.Horizontal)
{
availableRects.MergeItem(new Rect(Padding.Left, Padding.Top,
clientSize.Width + HorizontalSpacing, double.PositiveInfinity));
}
else
{
availableRects.MergeItem(new Rect(Padding.Left, Padding.Top,
double.PositiveInfinity, clientSize.Height + VerticalSpacing));
}
foreach (var child in Children)
{
child.Measure(clientSize);
var childSize = child.DesiredSize;
childSize.Width += HorizontalSpacing;
childSize.Height += VerticalSpacing;
var(index, rect) = Rects.FindEnoughArea(availableRects, childSize);
Debug.Assert(index != -1);
var(target, clipRight, clipBottom) = rect.Clip(childSize);
availableRects.RemoveAt(index);
availableRects.CutThenMergeOthers(target,
clipRight.GetValueOrDefault(),
clipBottom.GetValueOrDefault());
target.Width -= HorizontalSpacing;
target.Height -= VerticalSpacing;
arrageRects.Add(target);
if (Orientation == Orientation.Horizontal)
{
availableRects.Sort(CompareRectTop);
}
else
{
availableRects.Sort(CompareRectLeft);
}
}
availableRects.Clear();
var bounds = arrageRects.GetOutBounds();
requiredSize.Width += bounds.Width;
requiredSize.Height += bounds.Height;
return(requiredSize);
}
