123 lines
4.2 KiB
C#
123 lines
4.2 KiB
C#
using Microsoft.UI.Xaml;
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using Microsoft.UI.Xaml.Controls;
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using Microsoft.UI.Xaml.Navigation;
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using Microsoft.Xaml.Interactivity;
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using RustTools.Contracts.Services;
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namespace RustTools.Behaviors;
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public class NavigationViewHeaderBehavior : Behavior<NavigationView>
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{
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private static NavigationViewHeaderBehavior? _current;
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private Page? _currentPage;
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public DataTemplate? DefaultHeaderTemplate
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{
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get; set;
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}
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public object DefaultHeader
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{
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get => GetValue(DefaultHeaderProperty);
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set => SetValue(DefaultHeaderProperty, value);
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}
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public static readonly DependencyProperty DefaultHeaderProperty =
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DependencyProperty.Register("DefaultHeader", typeof(object), typeof(NavigationViewHeaderBehavior), new PropertyMetadata(null, (d, e) => _current!.UpdateHeader()));
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public static NavigationViewHeaderMode GetHeaderMode(Page item) => (NavigationViewHeaderMode)item.GetValue(HeaderModeProperty);
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public static void SetHeaderMode(Page item, NavigationViewHeaderMode value) => item.SetValue(HeaderModeProperty, value);
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public static readonly DependencyProperty HeaderModeProperty =
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DependencyProperty.RegisterAttached("HeaderMode", typeof(bool), typeof(NavigationViewHeaderBehavior), new PropertyMetadata(NavigationViewHeaderMode.Always, (d, e) => _current!.UpdateHeader()));
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public static object GetHeaderContext(Page item) => item.GetValue(HeaderContextProperty);
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public static void SetHeaderContext(Page item, object value) => item.SetValue(HeaderContextProperty, value);
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public static readonly DependencyProperty HeaderContextProperty =
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DependencyProperty.RegisterAttached("HeaderContext", typeof(object), typeof(NavigationViewHeaderBehavior), new PropertyMetadata(null, (d, e) => _current!.UpdateHeader()));
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public static DataTemplate GetHeaderTemplate(Page item) => (DataTemplate)item.GetValue(HeaderTemplateProperty);
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public static void SetHeaderTemplate(Page item, DataTemplate value) => item.SetValue(HeaderTemplateProperty, value);
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public static readonly DependencyProperty HeaderTemplateProperty =
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DependencyProperty.RegisterAttached("HeaderTemplate", typeof(DataTemplate), typeof(NavigationViewHeaderBehavior), new PropertyMetadata(null, (d, e) => _current!.UpdateHeaderTemplate()));
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protected override void OnAttached()
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{
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base.OnAttached();
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var navigationService = App.GetService<INavigationService>();
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navigationService.Navigated += OnNavigated;
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_current = this;
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}
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protected override void OnDetaching()
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{
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base.OnDetaching();
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var navigationService = App.GetService<INavigationService>();
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navigationService.Navigated -= OnNavigated;
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}
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private void OnNavigated(object sender, NavigationEventArgs e)
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{
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if (sender is Frame frame && frame.Content is Page page)
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{
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_currentPage = page;
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UpdateHeader();
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UpdateHeaderTemplate();
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}
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}
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private void UpdateHeader()
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{
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if (_currentPage != null)
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{
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var headerMode = GetHeaderMode(_currentPage);
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if (headerMode == NavigationViewHeaderMode.Never)
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{
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AssociatedObject.Header = null;
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AssociatedObject.AlwaysShowHeader = false;
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}
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else
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{
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var headerFromPage = GetHeaderContext(_currentPage);
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if (headerFromPage != null)
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{
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AssociatedObject.Header = headerFromPage;
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}
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else
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{
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AssociatedObject.Header = DefaultHeader;
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}
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if (headerMode == NavigationViewHeaderMode.Always)
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{
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AssociatedObject.AlwaysShowHeader = true;
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}
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else
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{
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AssociatedObject.AlwaysShowHeader = false;
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}
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}
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}
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}
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private void UpdateHeaderTemplate()
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{
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if (_currentPage != null)
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{
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var headerTemplate = GetHeaderTemplate(_currentPage);
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AssociatedObject.HeaderTemplate = headerTemplate ?? DefaultHeaderTemplate;
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}
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}
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}
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