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using System;
namespace Xamarin.Forms
{
[TypeConverter(typeof(LayoutOptionsConverter))]
public struct LayoutOptions
{
int _flags;
public static readonly LayoutOptions Start = new LayoutOptions(LayoutAlignment.Start, false);
public static readonly LayoutOptions Center = new LayoutOptions(LayoutAlignment.Center, false);
public static readonly LayoutOptions End = new LayoutOptions(LayoutAlignment.End, false);
public static readonly LayoutOptions Fill = new LayoutOptions(LayoutAlignment.Fill, false);
public static readonly LayoutOptions StartAndExpand = new LayoutOptions(LayoutAlignment.Start, true);
public static readonly LayoutOptions CenterAndExpand = new LayoutOptions(LayoutAlignment.Center, true);
public static readonly LayoutOptions EndAndExpand = new LayoutOptions(LayoutAlignment.End, true);
public static readonly LayoutOptions FillAndExpand = new LayoutOptions(LayoutAlignment.Fill, true);
public LayoutOptions(LayoutAlignment alignment, bool expands)
{
var a = (int)alignment;
if (a < 0 || a > 3)
throw new ArgumentOutOfRangeException();
_flags = (int)alignment | (expands ? (int)LayoutExpandFlag.Expand : 0);
}
public LayoutAlignment Alignment
{
get { return (LayoutAlignment)(_flags & 3); }
set { _flags = (_flags & ~3) | (int)value; }
}
public bool Expands
{
get { return (_flags & (int)LayoutExpandFlag.Expand) != 0; }
set { _flags = (_flags & 3) | (value ? (int)LayoutExpandFlag.Expand : 0); }
}
}
}
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