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using System;
using System.Collections.Generic;
using Xamarin.Forms.Xaml;
namespace Xamarin.Forms
{
[ContentProperty("Platforms")]
public class OnPlatform<T>
{
public OnPlatform()
{
Platforms = new List<On>();
}
bool useLegacyFallback;
T android;
[Obsolete]
public T Android {
get { return android; }
set {
useLegacyFallback = true;
android = value;
}
}
T ios;
[Obsolete]
public T iOS {
get { return ios; }
set {
useLegacyFallback = true;
ios = value;
}
}
T winPhone;
[Obsolete]
public T WinPhone {
get { return winPhone; }
set {
useLegacyFallback = true;
winPhone = value;
}
}
public IList<On> Platforms { get; private set; }
static readonly IValueConverterProvider s_valueConverter = DependencyService.Get<IValueConverterProvider>();
public static implicit operator T(OnPlatform<T> onPlatform)
{
foreach (var onPlat in onPlatform.Platforms) {
if (onPlat.Platform == null)
continue;
if (!onPlat.Platform.Contains(Device.RuntimePlatform))
continue;
if (s_valueConverter == null)
continue;
return (T)s_valueConverter.Convert(onPlat.Value, typeof(T), null, null);
}
if (!onPlatform.useLegacyFallback)
return default(T);
//legacy fallback
#pragma warning disable 0618, 0612
return Device.OnPlatform(iOS: onPlatform.iOS, Android: onPlatform.Android, WinPhone: onPlatform.WinPhone);
#pragma warning restore 0618, 0612
}
}
[ContentProperty("Value")]
public class On
{
[TypeConverter(typeof(ListStringTypeConverter))]
public IList<string> Platform { get; set; }
public object Value { get; set; }
}
}
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