protected Rectangle ClampRect(Rectangle r)
{
if (parent == null || !ClampMouseRectToParent)
{
return(r);
}
Rectangle parentRect = parent.ClampRect(parent.rect);
if (parentRect.Width <= 0 || parentRect.Height <= 0)
{
return(Rectangle.Empty);
}
if (parentRect.X > r.X)
{
int diff = parentRect.X - r.X;
r.X = parentRect.X;
r.Width -= diff;
}
if (parentRect.Y > r.Y)
{
int diff = parentRect.Y - r.Y;
r.Y = parentRect.Y;
r.Height -= diff;
}
if (parentRect.X + parentRect.Width < r.X + r.Width)
{
int diff = (r.X + r.Width) - (parentRect.X + parentRect.Width);
r.Width -= diff;
}
if (parentRect.Y + parentRect.Height < r.Y + r.Height)
{
int diff = (r.Y + r.Height) - (parentRect.Y + parentRect.Height);
r.Height -= diff;
}
if (r.Width <= 0 || r.Height <= 0)
{
return(Rectangle.Empty);
}
return(r);
}
