static void DrawFrame(EPolygon frame, int left, int top, int right, int bottom, int thickness)
{
frame.ClearPoints();
if (left + thickness >= right || top + thickness >= bottom)
{
if (left >= right || top >= bottom)
{
return;
}
// shape reduces to a rectangle
frame.AddPoint(left, top);
frame.AddPoint(right, top);
frame.AddPoint(right, bottom);
frame.AddPoint(left, bottom);
return;
}
// outside edge
frame.AddPoint(left, top);
frame.AddPoint(right, top);
frame.AddPoint(right, bottom);
frame.AddPoint(left, bottom);
frame.AddPoint(left, top + thickness);
// and inside edge
frame.AddPoint(left + thickness, top + thickness);
frame.AddPoint(left + thickness, bottom - thickness);
frame.AddPoint(right - thickness, bottom - thickness);
frame.AddPoint(right - thickness, top + thickness);
frame.AddPoint(left, top + thickness);
}
protected override void OnElementChanged(ElementChangedEventArgs <Layout> e)
{
if (Control == null)
{
SetNativeControl(new Native.Canvas(Forms.NativeParent));
_shadow = new EPolygon(NativeView);
_shadow.Color = s_ShadowColor;
Control.Children.Add(_shadow);
_frame = new EPolygon(NativeView);
_frame.Show();
Control.Children.Add(_frame);
Control.LayoutUpdated += OnLayoutUpdated;
}
base.OnElementChanged(e);
}
