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using System.Threading.Tasks;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Media;
using Xamarin.Forms.PlatformConfiguration.WindowsSpecific;
#if WINDOWS_UWP
namespace Xamarin.Forms.Platform.UWP
#else
namespace Xamarin.Forms.Platform.WinRT
#endif
{
public class FormsPivot : Pivot, IToolbarProvider
{
public static readonly DependencyProperty TitleVisibilityProperty = DependencyProperty.Register(nameof(TitleVisibility), typeof(Visibility), typeof(FormsPivot),
new PropertyMetadata(Visibility.Collapsed));
public static readonly DependencyProperty ToolbarForegroundProperty = DependencyProperty.Register(nameof(ToolbarForeground), typeof(Brush), typeof(FormsPivot), new PropertyMetadata(default(Brush)));
public static readonly DependencyProperty ToolbarBackgroundProperty = DependencyProperty.Register(nameof(ToolbarBackground), typeof(Brush), typeof(FormsPivot), new PropertyMetadata(default(Brush)));
CommandBar _commandBar;
#if WINDOWS_UWP
Border _bottomCommandBarArea;
Border _topCommandBarArea;
#endif
TaskCompletionSource<CommandBar> _commandBarTcs;
ToolbarPlacement _toolbarPlacement;
public Brush ToolbarBackground
{
get { return (Brush)GetValue(ToolbarBackgroundProperty); }
set { SetValue(ToolbarBackgroundProperty, value); }
}
public Brush ToolbarForeground
{
get { return (Brush)GetValue(ToolbarForegroundProperty); }
set { SetValue(ToolbarForegroundProperty, value); }
}
public Visibility TitleVisibility
{
get { return (Visibility)GetValue(TitleVisibilityProperty); }
set { SetValue(TitleVisibilityProperty, value); }
}
public ToolbarPlacement ToolbarPlacement
{
get { return _toolbarPlacement; }
set
{
_toolbarPlacement = value;
#if WINDOWS_UWP
UpdateToolbarPlacement();
#endif
}
}
Task<CommandBar> IToolbarProvider.GetCommandBarAsync()
{
if (_commandBar != null)
return Task.FromResult(_commandBar);
_commandBarTcs = new TaskCompletionSource<CommandBar>();
ApplyTemplate();
return _commandBarTcs.Task;
}
protected override void OnApplyTemplate()
{
base.OnApplyTemplate();
_commandBar = GetTemplateChild("CommandBar") as CommandBar;
#if WINDOWS_UWP
_bottomCommandBarArea = GetTemplateChild("BottomCommandBarArea") as Border;
_topCommandBarArea = GetTemplateChild("TopCommandBarArea") as Border;
if (_commandBar != null && _bottomCommandBarArea != null && _topCommandBarArea != null)
{
// We have to wait for the command bar to load so that it'll be in the control hierarchy
// otherwise we can't properly move it to wherever the toolbar is supposed to be
_commandBar.Loaded += (sender, args) => UpdateToolbarPlacement();
}
#endif
TaskCompletionSource<CommandBar> tcs = _commandBarTcs;
tcs?.SetResult(_commandBar);
}
#if WINDOWS_UWP
void UpdateToolbarPlacement()
{
ToolbarPlacementHelper.UpdateToolbarPlacement(_commandBar, ToolbarPlacement, _bottomCommandBarArea, _topCommandBarArea);
}
#endif
}
}
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