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using System;
using System.Collections.Generic;
namespace Xamarin.Forms
{
internal static class EnumerableExtensions
{
public static IEnumerable<T> GetGesturesFor<T>(this IEnumerable<IGestureRecognizer> gestures, Func<T, bool> predicate = null) where T : GestureRecognizer
{
if (gestures == null)
yield break;
if (predicate == null)
predicate = x => true;
foreach (IGestureRecognizer item in gestures)
{
var gesture = item as T;
if (gesture != null && predicate(gesture))
{
yield return gesture;
}
}
}
internal static IEnumerable<T> Append<T>(this IEnumerable<T> enumerable, T item)
{
foreach (T x in enumerable)
yield return x;
yield return item;
}
internal static void ForEach<T>(this IEnumerable<T> enumeration, Action<T> action)
{
foreach (T item in enumeration)
{
action(item);
}
}
internal static int IndexOf<T>(this IEnumerable<T> enumerable, T item)
{
if (enumerable == null)
throw new ArgumentNullException("enumerable");
var i = 0;
foreach (T element in enumerable)
{
if (Equals(element, item))
return i;
i++;
}
return -1;
}
internal static int IndexOf<T>(this IEnumerable<T> enumerable, Func<T, bool> predicate)
{
var i = 0;
foreach (T element in enumerable)
{
if (predicate(element))
return i;
i++;
}
return -1;
}
internal static IEnumerable<T> Prepend<T>(this IEnumerable<T> enumerable, T item)
{
yield return item;
foreach (T x in enumerable)
yield return x;
}
}
}
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