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using System;
using System.Globalization;
using System.Windows.Input;
namespace Xamarin.Forms.Controls
{
[Preserve (AllMembers = true)]
public class BoundContentPage : ContentPage
{
internal class NavWrapperConverter : IValueConverter
{
public object Convert (object value, Type targetType, object parameter, CultureInfo culture)
{
throw new NotSupportedException ();
}
public object ConvertBack (object value, Type targetType, object parameter, CultureInfo culture)
{
return new NavigationWrapper ((INavigation) value);
}
}
internal class NavigationWrapper
{
// This class is dumb but proves you can wrap the INavigation with a converter to do some MVVM goodness
// Normally this class would implement pushes with ViewModel then do the conversion
readonly INavigation _inner;
public NavigationWrapper (INavigation inner )
{
_inner = inner;
}
public void WrappedPush ()
{
_inner.PushAsync (new ContentPage {
Content = new StackLayout {
BackgroundColor = Color.Red,
Children = {
new Label {
Text = "Second Page"
}
}
}
});
}
}
[Preserve (AllMembers = true)]
internal class BoundContentPageViewModel
{
public string ButtonText { get { return "Click Me!"; } }
public ICommand ButtonCommand { get; set; }
public NavigationWrapper Navigation { get; set; }
public BoundContentPageViewModel ()
{
ButtonCommand = new Command (() => Navigation.WrappedPush ());
}
}
public BoundContentPage ()
{
Title ="Bound Gallery";
BindingContext = new BoundContentPageViewModel ();
var button = new Button ();
button.SetBinding (Button.TextProperty, "ButtonText");
button.SetBinding (Button.CommandProperty, "ButtonCommand");
SetBinding (NavigationProperty, new Binding ("Navigation", converter: new NavWrapperConverter ()));
Content = button;
}
}
}
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