/// <summary>
/// Renders controls listed under this control's hierarchy.
/// </summary>
/// <param name="offset">The upper-left corner of this control in screen coordinates.</param>
/// <param name="updateRect">The intersection rectangle, in screen coordinates, of the control hierarchy.</param>
protected void _RenderChildControls(Vector2 offset, RectangleF updateRect)
{
int idx;
int numObjects = GetNumObjects();
// store the clip
RectangleF oldClip = DrawUtil.ClipRect;
// offset is the upper-left corner of this control in screen coordinates
// updateRect is the inter
for (idx = 0; idx < numObjects; idx++)
{
GUIControl child = (GUIControl)GetObject(idx);
if (child == null)
break;
if (child.Visible)
{
Vector2 childPosition = new Vector2(offset.X + child.Position.X, offset.Y + child.Position.Y);
RectangleF childClip = new RectangleF(childPosition, child.Size);
if (childClip.Intersect(updateRect))
{
DrawUtil.ClipRect = childClip;
child.OnRender(childPosition, childClip);
}
}
}
// restore the old clip
DrawUtil.ClipRect = oldClip;
}
/// <summary>
/// Tests if this rectangle overlaps another rectangle.
/// </summary>
/// <param name="rect">The rectangle to test against.</param>
/// <returns></returns>
public bool Overlaps(RectangleF rect)
{
RectangleF test = new RectangleF(this);
return test.Intersect(rect);
}