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using Windows.UI.Core;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Data;
using Xamarin.Forms.PlatformConfiguration.WindowsSpecific;
namespace Xamarin.Forms.Platform.UWP
{
public partial class NavigationPageRenderer : IToolBarForegroundBinder
{
SystemNavigationManager _navManager;
public void BindForegroundColor(AppBar appBar)
{
SetAppBarForegroundBinding(appBar);
}
public void BindForegroundColor(AppBarButton button)
{
SetAppBarForegroundBinding(button);
}
void SetAppBarForegroundBinding(FrameworkElement element)
{
element.SetBinding(Control.ForegroundProperty,
new Windows.UI.Xaml.Data.Binding { Path = new PropertyPath("TitleBrush"), Source = _container, RelativeSource = new RelativeSource { Mode = RelativeSourceMode.TemplatedParent } });
}
void UpdateToolbarPlacement()
{
if (_container == null)
{
return;
}
_container.ToolbarPlacement = Element.OnThisPlatform().GetToolbarPlacement();
}
void UpdateShowTitle()
{
((ITitleProvider)this).ShowTitle = _parentTabbedPage == null && _parentMasterDetailPage == null;
}
static object GetDefaultColor()
{
return Windows.UI.Xaml.Application.Current.Resources["SystemControlBackgroundChromeMediumLowBrush"];
}
void UpdateBackButton()
{
bool showBackButton = Element.InternalChildren.Count > 1 && NavigationPage.GetHasBackButton(_currentPage);
_container.ShowBackButton = showBackButton;
if (_navManager != null)
{
_navManager.AppViewBackButtonVisibility = showBackButton ? AppViewBackButtonVisibility.Visible : AppViewBackButtonVisibility.Collapsed;
}
}
async void UpdateTitleOnParents()
{
if (Element == null)
return;
ITitleProvider render = null;
if (_parentTabbedPage != null)
{
render = Platform.GetRenderer(_parentTabbedPage) as ITitleProvider;
if (render != null)
render.ShowTitle = (_parentTabbedPage.CurrentPage == Element) && NavigationPage.GetHasNavigationBar(_currentPage);
}
if (_parentMasterDetailPage != null)
{
render = Platform.GetRenderer(_parentMasterDetailPage) as ITitleProvider;
if (render != null)
render.ShowTitle = (_parentMasterDetailPage.Detail == Element) && NavigationPage.GetHasNavigationBar(_currentPage);
}
if (render != null && render.ShowTitle)
{
render.Title = _currentPage.Title;
render.BarBackgroundBrush = GetBarBackgroundBrush();
render.BarForegroundBrush = GetBarForegroundBrush();
}
if (_showTitle || (render != null && render.ShowTitle))
{
var platform = Element.Platform as Platform;
if (platform != null)
{
await platform.UpdateToolbarItems();
}
}
}
}
}
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