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
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+using System.Diagnostics.CodeAnalysis;
+
+using Microsoft.UI.Xaml.Controls;
+using Microsoft.UI.Xaml.Navigation;
+
+using TemplateStudioSampleApp.Contracts.Services;
+using TemplateStudioSampleApp.Contracts.ViewModels;
+using TemplateStudioSampleApp.Helpers;
+
+namespace TemplateStudioSampleApp.Services;
+
+// For more information on navigation between pages see
+// https://github.com/microsoft/TemplateStudio/blob/main/docs/WinUI/navigation.md
+public class NavigationService : INavigationService
+{
+    private readonly IPageService _pageService;
+    private object? _lastParameterUsed;
+    private Frame? _frame;
+
+    public event NavigatedEventHandler? Navigated;
+
+    public Frame? Frame
+    {
+        get
+        {
+            if (_frame == null)
+            {
+                _frame = App.MainWindow.Content as Frame;
+                RegisterFrameEvents();
+            }
+
+            return _frame;
+        }
+
+        set
+        {
+            UnregisterFrameEvents();
+            _frame = value;
+            RegisterFrameEvents();
+        }
+    }
+
+    [MemberNotNullWhen(true, nameof(Frame), nameof(_frame))]
+    public bool CanGoBack => Frame != null && Frame.CanGoBack;
+
+    public NavigationService(IPageService pageService)
+    {
+        _pageService = pageService;
+    }
+
+    private void RegisterFrameEvents()
+    {
+        if (_frame != null)
+        {
+            _frame.Navigated += OnNavigated;
+        }
+    }
+
+    private void UnregisterFrameEvents()
+    {
+        if (_frame != null)
+        {
+            _frame.Navigated -= OnNavigated;
+        }
+    }
+
+    public bool GoBack()
+    {
+        if (CanGoBack)
+        {
+            var vmBeforeNavigation = _frame.GetPageViewModel();
+            _frame.GoBack();
+            if (vmBeforeNavigation is INavigationAware navigationAware)
+            {
+                navigationAware.OnNavigatedFrom();
+            }
+
+            return true;
+        }
+
+        return false;
+    }
+
+    public bool NavigateTo(string pageKey, object? parameter = null, bool clearNavigation = false)
+    {
+        var pageType = _pageService.GetPageType(pageKey);
+
+        if (_frame != null && (_frame.Content?.GetType() != pageType || (parameter != null && !parameter.Equals(_lastParameterUsed))))
+        {
+            _frame.Tag = clearNavigation;
+            var vmBeforeNavigation = _frame.GetPageViewModel();
+            var navigated = _frame.Navigate(pageType, parameter);
+            if (navigated)
+            {
+                _lastParameterUsed = parameter;
+                if (vmBeforeNavigation is INavigationAware navigationAware)
+                {
+                    navigationAware.OnNavigatedFrom();
+                }
+            }
+
+            return navigated;
+        }
+
+        return false;
+    }
+
+    private void OnNavigated(object sender, NavigationEventArgs e)
+    {
+        if (sender is Frame frame)
+        {
+            var clearNavigation = (bool)frame.Tag;
+            if (clearNavigation)
+            {
+                frame.BackStack.Clear();
+            }
+
+            if (frame.GetPageViewModel() is INavigationAware navigationAware)
+            {
+                navigationAware.OnNavigatedTo(e.Parameter);
+            }
+
+            Navigated?.Invoke(sender, e);
+        }
+    }
+}