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Restore navigation-related functions
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124 changes: 61 additions & 63 deletions
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src/MetroTrilithon.Desktop/UI/Controls/NavigationHelper.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,63 +1,61 @@ | ||
| //using System; | ||
| //using System.Collections.Generic; | ||
| //using System.Linq; | ||
| //using System.Reactive.Linq; | ||
| //using System.Windows; | ||
| //using System.Windows.Navigation; | ||
| //using Microsoft.Xaml.Behaviors; | ||
| //using Wpf.Ui.Common; | ||
| //using Wpf.Ui.Controls; | ||
| //using Wpf.Ui.Controls.Navigation; | ||
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| //namespace MetroTrilithon.UI.Controls; | ||
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| //public class NavigationHelper | ||
| //{ | ||
| // #region PropagationContext attached property | ||
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| // private static readonly HashSet<NavigationBase> _knownItems = new(); | ||
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| // public static readonly DependencyProperty PropagationContextProperty | ||
| // = DependencyProperty.RegisterAttached( | ||
| // nameof(PropagationContextProperty).GetPropertyName(), | ||
| // typeof(object), | ||
| // typeof(NavigationHelper), | ||
| // new PropertyMetadata(null, HandlePropagationContextChanged)); | ||
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| // public static void SetPropagationContext(DependencyObject element, object value) | ||
| // => element.SetValue(PropagationContextProperty, value); | ||
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| // public static object GetPropagationContext(DependencyObject element) | ||
| // => element.GetValue(PropagationContextProperty); | ||
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| // private static void HandlePropagationContextChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) | ||
| // { | ||
| // if (d is not NavigationItem item) throw new NotSupportedException($"The '{nameof(PropagationContextProperty).GetPropertyName()}' attached property is only supported for the '{nameof(NavigationItem)}' type."); | ||
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| // var navigation = item.GetSelfAndAncestors() | ||
| // .OfType<NavigationBase>() | ||
| // .FirstOrDefault(); | ||
| // if (navigation?.Frame == null || _knownItems.Add(navigation) == false) return; | ||
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| // Observable.FromEvent<RoutedNavigationEvent, RoutedNavigationEventArgs>( | ||
| //#pragma warning disable CS8622 | ||
| // handler => (_, args) => handler(args), | ||
| //#pragma warning restore CS8622 | ||
| // handler => navigation.Navigated += handler, | ||
| // handler => navigation.Navigated -= handler) | ||
| // .Zip(Observable.FromEvent<NavigatedEventHandler, NavigationEventArgs>( | ||
| // handler => (_, args) => handler(args), | ||
| // handler => navigation.Frame.Navigated += handler, | ||
| // handler => navigation.Frame.Navigated -= handler)) | ||
| // .Subscribe(args => | ||
| // { | ||
| // if (args.First.CurrentPage is NavigationItem navigationItem | ||
| // && args.Second.Content is FrameworkElement element) | ||
| // { | ||
| // element.DataContext = GetPropagationContext(navigationItem); | ||
| // } | ||
| // }); | ||
| // } | ||
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| // #endregion | ||
| //} | ||
| using System; | ||
| using System.Collections.Generic; | ||
| using System.Linq; | ||
| using System.Reactive.Linq; | ||
| using System.Windows; | ||
| using Microsoft.Xaml.Behaviors; | ||
| using Wpf.Ui.Common; | ||
| using Wpf.Ui.Controls; | ||
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| namespace MetroTrilithon.UI.Controls; | ||
|
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| public class NavigationHelper | ||
| { | ||
| #region PropagationContext attached property | ||
|
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| private static readonly HashSet<NavigationView> _knownItems = new(); | ||
|
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| public static readonly DependencyProperty PropagationContextProperty | ||
| = DependencyProperty.RegisterAttached( | ||
| nameof(PropagationContextProperty).GetPropertyName(), | ||
| typeof(object), | ||
| typeof(NavigationHelper), | ||
| new PropertyMetadata(null, HandlePropagationContextChanged)); | ||
|
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| public static void SetPropagationContext(DependencyObject element, object value) | ||
| => element.SetValue(PropagationContextProperty, value); | ||
|
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| public static object GetPropagationContext(DependencyObject element) | ||
| => element.GetValue(PropagationContextProperty); | ||
|
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| private static void HandlePropagationContextChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) | ||
| { | ||
| if (d is not NavigationViewItem item) | ||
| { | ||
| throw new NotSupportedException($"The '{nameof(PropagationContextProperty).GetPropertyName()}' attached property is only supported for the '{nameof(NavigationViewItem)}' type."); | ||
| } | ||
|
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| var navigation = item.GetSelfAndAncestors() | ||
| .OfType<NavigationView>() | ||
| .FirstOrDefault(); | ||
| if (navigation == null || _knownItems.Add(navigation) == false) return; | ||
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| Observable.FromEvent<TypedEventHandler<NavigationView, NavigatedEventArgs>, NavigatedEventArgs>( | ||
| handler => (_, args) => handler(args), | ||
| handler => navigation.Navigated += handler, | ||
| handler => navigation.Navigated -= handler) | ||
| .Zip(Observable.FromEvent<TypedEventHandler<NavigationView, RoutedEventArgs>, RoutedEventArgs>( | ||
| handler => (_, args) => handler(args), | ||
| handler => navigation.SelectionChanged += handler, | ||
| handler => navigation.SelectionChanged -= handler)) | ||
| .Subscribe(args => | ||
| { | ||
| if (args is { First.Page: FrameworkElement element, Second.Source: NavigationView { SelectedItem: NavigationViewItem selected} }) | ||
| { | ||
| element.DataContext = GetPropagationContext(selected); | ||
| } | ||
| }); | ||
| } | ||
|
|
||
| #endregion | ||
| } |
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