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using System;
using System.Collections.Generic;
using System.Linq;
using Xamarin.Forms.Platform;
namespace Xamarin.Forms
{
// Mark as internal until renderers are ready for release after 1.0
[RenderWith(typeof(_NavigationMenuRenderer))]
internal class NavigationMenu : View
{
readonly List<Page> _targets = new List<Page>();
public IEnumerable<Page> Targets
{
get { return _targets; }
set
{
if (_targets.AsEnumerable().SequenceEqual(value))
return;
foreach (Page page in value)
{
VerifyTarget(page);
}
OnPropertyChanging();
_targets.Clear();
_targets.AddRange(value);
OnPropertyChanged();
}
}
public void Add(Page target)
{
if (_targets.Contains(target))
return;
VerifyTarget(target);
OnPropertyChanging("Targets");
_targets.Add(target);
OnPropertyChanged("Targets");
}
public void Remove(Page target)
{
if (_targets.Contains(target))
{
OnPropertyChanging("Targets");
if (_targets.Remove(target))
OnPropertyChanged("Targets");
}
}
internal void SendTargetSelected(Page target)
{
TargetSelected(target);
}
void TargetSelected(Page target)
{
Navigation.PushAsync(target);
}
void VerifyTarget(Page target)
{
if (target.Icon == null || string.IsNullOrWhiteSpace(target.Icon.File))
throw new Exception("Icon must be set for each page before adding them to a Navigation Menu");
}
}
}
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