protected override void OnElementChanged(ElementChangedEventArgs <Xamarin.Forms.Button> e)
{
base.OnElementChanged(e);
if (e.OldElement != null && _drawableEnabled)
{
_drawableEnabled = false;
_backgroundDrawable.Reset();
_backgroundDrawable = null;
}
UpdateDrawable();
}
protected override void Dispose(bool disposing)
{
if (disposing)
{
if (_backgroundDrawable != null)
{
_backgroundDrawable.Dispose();
_backgroundDrawable = null;
}
}
base.Dispose(disposing);
}
private void UpdateDrawable()
{
if (Element.BackgroundColor == Color.Default)
{
if (!_drawableEnabled)
{
return;
}
if (_defaultDrawable != null)
{
Control.SetBackground(_defaultDrawable);
}
_drawableEnabled = false;
}
else
{
if (_backgroundDrawable == null)
{
_backgroundDrawable = new ButtonDrawable();
}
_backgroundDrawable.Button = Element;
if (_drawableEnabled)
{
return;
}
if (_defaultDrawable == null)
{
_defaultDrawable = Control.Background;
}
Control.SetBackground(_backgroundDrawable.GetDrawable());
_drawableEnabled = true;
}
Control.Invalidate();
}