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using Windows.Foundation.Collections;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
namespace Xamarin.Forms.Platform.UWP
{
public class FormsCommandBar : CommandBar
{
Windows.UI.Xaml.Controls.Button _moreButton;
public FormsCommandBar()
{
PrimaryCommands.VectorChanged += OnCommandsChanged;
SecondaryCommands.VectorChanged += OnCommandsChanged;
}
protected override void OnApplyTemplate()
{
base.OnApplyTemplate();
_moreButton = GetTemplateChild("MoreButton") as Windows.UI.Xaml.Controls.Button;
UpdateMore();
}
void OnCommandsChanged(IObservableVector<ICommandBarElement> sender, IVectorChangedEventArgs args)
{
UpdateMore();
}
void UpdateMore()
{
if (_moreButton == null)
return;
_moreButton.Visibility = PrimaryCommands.Count > 0 || SecondaryCommands.Count > 0 ? Visibility.Visible : Visibility.Collapsed;
}
}
}
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