// This could be greatly optimized by caching the outputs and only updating when something is moved
// in the parent planar space. To do that we need to track z-order in the parent space as well
public ArrayList GetClippingRectangles()
{
ArrayList masks = new ArrayList();
if (x < 0)
{
masks.Add(new Rectangle_(0, 0, x * -1, Height));
if (y < 0)
{
masks.Add(new Rectangle_(x * -1, 0, Width, y * -1));
}
}
else if (y < 0)
{
masks.Add(new Rectangle_(0, 0, Width, y * -1));
}
foreach (Hwnd child in children)
{
if (child.visible)
{
masks.Add(new Rectangle_(child.X, child.Y, child.Width, child.Height));
}
}
if (parent == null)
{
return(masks);
}
ArrayList siblings = parent.children;
foreach (Hwnd sibling in siblings)
{
IntPtr sibling_handle = whole_window;
if (sibling == this)
{
continue;
}
// This entire method should be cached to find all higher views at the time of query
do
{
sibling_handle = XplatUI.GetPreviousWindow(sibling_handle);
if (sibling_handle == sibling.WholeWindow && sibling.visible)
{
Rectangle_ intersect = Rectangle.Intersect(new Rectangle_(X, Y, Width, Height), new Rectangle_(sibling.X, sibling.Y, sibling.Width, sibling.Height));
if (intersect == Rectangle_.Empty)
{
continue;
}
intersect.X -= X;
intersect.Y -= Y;
masks.Add(intersect);
}
} while (sibling_handle != IntPtr.Zero);
}
return(masks);
}
