Add chapter 10 sample project

2026-06-20 12:23:09 +00:00 · 2023-08-13 13:40:04 -04:00
parent f9e4d407b9
commit 90f935f4b2
91 changed files with 4110 additions and 0 deletions
@@ -0,0 +1,103 @@
+using System.Diagnostics.CodeAnalysis;
+
+using Microsoft.UI.Xaml.Controls;
+
+using TemplateStudioSampleApp.Contracts.Services;
+using TemplateStudioSampleApp.Helpers;
+using TemplateStudioSampleApp.ViewModels;
+
+namespace TemplateStudioSampleApp.Services;
+
+public class NavigationViewService : INavigationViewService
+{
+    private readonly INavigationService _navigationService;
+
+    private readonly IPageService _pageService;
+
+    private NavigationView? _navigationView;
+
+    public IList<object>? MenuItems => _navigationView?.MenuItems;
+
+    public object? SettingsItem => _navigationView?.SettingsItem;
+
+    public NavigationViewService(INavigationService navigationService, IPageService pageService)
+    {
+        _navigationService = navigationService;
+        _pageService = pageService;
+    }
+
+    [MemberNotNull(nameof(_navigationView))]
+    public void Initialize(NavigationView navigationView)
+    {
+        _navigationView = navigationView;
+        _navigationView.BackRequested += OnBackRequested;
+        _navigationView.ItemInvoked += OnItemInvoked;
+    }
+
+    public void UnregisterEvents()
+    {
+        if (_navigationView != null)
+        {
+            _navigationView.BackRequested -= OnBackRequested;
+            _navigationView.ItemInvoked -= OnItemInvoked;
+        }
+    }
+
+    public NavigationViewItem? GetSelectedItem(Type pageType)
+    {
+        if (_navigationView != null)
+        {
+            return GetSelectedItem(_navigationView.MenuItems, pageType) ?? GetSelectedItem(_navigationView.FooterMenuItems, pageType);
+        }
+
+        return null;
+    }
+
+    private void OnBackRequested(NavigationView sender, NavigationViewBackRequestedEventArgs args) => _navigationService.GoBack();
+
+    private void OnItemInvoked(NavigationView sender, NavigationViewItemInvokedEventArgs args)
+    {
+        if (args.IsSettingsInvoked)
+        {
+            _navigationService.NavigateTo(typeof(SettingsViewModel).FullName!);
+        }
+        else
+        {
+            var selectedItem = args.InvokedItemContainer as NavigationViewItem;
+
+            if (selectedItem?.GetValue(NavigationHelper.NavigateToProperty) is string pageKey)
+            {
+                _navigationService.NavigateTo(pageKey);
+            }
+        }
+    }
+
+    private NavigationViewItem? GetSelectedItem(IEnumerable<object> menuItems, Type pageType)
+    {
+        foreach (var item in menuItems.OfType<NavigationViewItem>())
+        {
+            if (IsMenuItemForPageType(item, pageType))
+            {
+                return item;
+            }
+
+            var selectedChild = GetSelectedItem(item.MenuItems, pageType);
+            if (selectedChild != null)
+            {
+                return selectedChild;
+            }
+        }
+
+        return null;
+    }
+
+    private bool IsMenuItemForPageType(NavigationViewItem menuItem, Type sourcePageType)
+    {
+        if (menuItem.GetValue(NavigationHelper.NavigateToProperty) is string pageKey)
+        {
+            return _pageService.GetPageType(pageKey) == sourcePageType;
+        }
+
+        return false;
+    }
+}