private void UpdateBorder()
{
if (_border == null)
{
return;
}
float width = _hitArea.Width;
var height = _hitArea.Height;
Quad topLine = _border.GetChild(0) as Quad;
Quad rightLine = _border.GetChild(1) as Quad;
Quad bottomLine = _border.GetChild(2) as Quad;
Quad leftLine = _border.GetChild(3) as Quad;
topLine.Width = width; topLine.Height = 1;
bottomLine.Width = width; bottomLine.Height = 1;
leftLine.Width = 1; leftLine.Height = height;
rightLine.Width = 1; rightLine.Height = height;
rightLine.X = width - 1;
bottomLine.Y = height - 1;
topLine.Color = rightLine.Color = bottomLine.Color = leftLine.Color = _format.Color;
}