/// <summary>
/// The focus has moved to a new control. Track the focused button
/// if it's one of ours.
/// </summary>
/// <param name="context">Focus update context.</param>
/// <param name="coordinator">Focus animation coordinator.</param>
public override void DidUpdateFocus(UIFocusUpdateContext context, UIFocusAnimationCoordinator coordinator)
{
base.DidUpdateFocus(context, coordinator);
var buttons = Subviews.Cast <MenuButton>().ToList();
for (int i = 0; i < buttons.Count; i++)
{
if (context.NextFocusedView == buttons[i])
{
FocusedButtonIndex = i;
}
}
}
/// <summary>
/// Layouts the buttons so they are centered horizontally and vertically.
/// </summary>
private void LayoutButtons()
{
var buttons = Subviews.Cast <MenuButton>().ToList();
nfloat totalWidth = 0;
if (buttons.Count == 0)
{
return;
}
//
// Determine the total width we will be using.
//
buttons.ForEach(b =>
{
b.SizeToFit();
totalWidth += b.Frame.Width;
});
//
// Get our starting position of the first button.
//
nfloat x = (Bounds.Width - totalWidth) / 2.0f;
//
// Position each button sequentially.
//
buttons.ForEach(b =>
{
nfloat y = Bounds.Size.Height / 4.0f;
b.Frame = new CGRect(x, y, b.Frame.Size.Width, Bounds.Size.Height / 2.0f);
x += b.Frame.Size.Width;
});
}
