public IEnumerable <DropRegion> DropRegions(Point origin)
{
if (elements.Count == 0)
{
yield break;
}
else
{
bool connectAbove = false, connectBelow = false;
IStackableBlockView first = (IStackableBlockView)elements[0];
IStackableBlockView last = (IStackableBlockView)elements.Last();
connectAbove = first.EffectiveAttribute() != BlockAttributes.Hat;
connectBelow = last.EffectiveAttribute() != BlockAttributes.Cap;
if (connectAbove)
{
yield return(new DropRegion(DropType.Above, new Rectangle(origin.Offseted(0, -2), new Size(_cached.Width, 5)), this));
}
int y = origin.Y + elementBitmaps[0].Height - BlockStackView.NotchHeight;
for (int i = 1; i < elements.Count; ++i)
{
yield return(new DropRegion(DropType.Between,
new Rectangle(origin.X, y - 2, elementBitmaps[i].Width, 5),
this,
i));
y += elementBitmaps[i].Height - BlockStackView.NotchHeight;
}
if (connectBelow)
{
yield return(new DropRegion(DropType.Below, new Rectangle(origin.Offseted(0, _cached.Height - 2), new Size(_cached.Width, 5)), this));
}
foreach (DropRegion r in ChildDropRegions(origin))
{
yield return(r);
}
}
}
public static bool HasBottomNotch(this IStackableBlockView v)
{
return(v.EffectiveAttribute() == BlockAttributes.Hat ||
v.EffectiveAttribute() == BlockAttributes.Stack);
}