Update (Back-end): Navigation établie, mais bancale

Sources/BookApp/MainPage.xaml

@@ -2,6 +2,7 @@
 <ContentPage
 	xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
 	xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+    xmlns:vm="clr-namespace:BookApp.ViewModel"
     xmlns:toolkit="http://schemas.microsoft.com/dotnet/2022/maui/toolkit"
     x:Class="BookApp.MainPage">
     <Shell.TitleView>
@@ -37,13 +38,35 @@
     <Shell.BackButtonBehavior>
         <BackButtonBehavior IsVisible="False" IsEnabled="False" />
     </Shell.BackButtonBehavior>
+
+    <ContentPage.Resources>
+        <Style TargetType="StackLayout">
+            <Setter Property="VisualStateManager.VisualStateGroups">
+                <VisualStateGroupList>
+                    <VisualStateGroup x:Name="CommonStates">
+                        <VisualState x:Name="Normal" />
+                        <VisualState x:Name="Selected">
+                            <VisualState.Setters>
+                                <Setter Property="BackgroundColor"
+                                    Value="Purple" />
+                            </VisualState.Setters>
+                        </VisualState>
+                    </VisualStateGroup>
+                </VisualStateGroupList>
+            </Setter>
+        </Style>
+    </ContentPage.Resources>
+
     <StackLayout>
         <Label FontSize="35" FontFamily="SF-Pro-Display-Bold" Padding="10">Mes livres</Label>
         <Rectangle  HeightRequest="1" BackgroundColor="black" VerticalOptions="End" />
-        <CollectionView ItemsSource="{Binding MyCollections1}" SelectionMode="Single" SelectionChanged="OnSelectionChanged" Margin="25,0,0,0" BackgroundColor="#F9F9F9">
+        <CollectionView ItemsSource="{Binding ViewModelMenu.MenuItemsLivre}"
+                        SelectionChangedCommand="{Binding ViewModelNavigation.ItemSelectedCommand}"
+                        SelectedItem="{Binding ViewModelNavigation.SelectedItem, Mode=TwoWay}"
+                        SelectionMode="Single" Margin="25,0,0,0" BackgroundColor="#F9F9F9">
 
             <CollectionView.ItemTemplate>
-                <DataTemplate>
+                <DataTemplate x:DataType="vm:ViewModelMenuItem">
                     <Grid RowDefinitions="Auto" >
                         <Grid.ColumnDefinitions>
                             <ColumnDefinition Width="25"/>
@@ -92,9 +115,12 @@
         <Label FontFamily="SF-Pro-Display-Heavy" FontSize="20" Padding="10">Filtres</Label>
         <Rectangle  HeightRequest="1" BackgroundColor="black" VerticalOptions="End"/>
 
-        <CollectionView ItemsSource="{Binding MyCollections2}" Margin="25,0,0,0" BackgroundColor="#F9F9F9">
+        <CollectionView ItemsSource="{Binding ViewModelMenu.MenuItemsFiltre}" 
+                        SelectionChangedCommand="{Binding ViewModelNavigation.ItemSelectedCommand}"
+                        SelectedItem="{Binding ViewModelNavigation.SelectedItem, Mode=TwoWay}"
+                        Margin="25,0,0,0" BackgroundColor="#F9F9F9">
             <CollectionView.ItemTemplate>
-                <DataTemplate>
+                <DataTemplate x:DataType="vm:ViewModelMenuItem">
                     <Grid RowDefinitions="Auto" >
                         <Grid.ColumnDefinitions>
                             <ColumnDefinition Width="25" />

Sources/BookApp/MainPage.xaml.cs

@@ -6,12 +6,10 @@ namespace BookApp
 {
     public partial class MainPage : ContentPage
     {
-        public MainPage(NavigationViewModel data)
+        public MainPage(ViewModelManager data)
         {
             InitializeComponent();
             BindingContext = data;
         }
-
-        private async void OnSelectionChanged(object sender, SelectionChangedEventArgs e) { }
     }
 }

Sources/BookApp/MauiProgram.cs

@@ -35,7 +35,9 @@ namespace BookApp
             builder.Services.AddSingleton<CollectionFiltrage>();
             builder.Services.AddSingleton<Tous>();
             builder.Services.AddSingleton<MainPage>();
-            builder.Services.AddSingleton<NavigationViewModel>();
+            builder.Services.AddSingleton<ViewModelNavigation>();
+
+            builder.Services.AddTransient<ViewModelMenu>();
 
             // transient pour recharger la data à l'execute
 

Sources/BookApp/Pages/Tous.xaml.cs

@@ -1,4 +1,5 @@
 using BookApp.ViewModel;
+using System.Diagnostics;
 using VMWrapper;
 
 namespace BookApp.Pages
@@ -8,6 +9,7 @@ namespace BookApp.Pages
         public Tous(BookViewModel data)
         {
             InitializeComponent();
+            Debug.WriteLine("TousPage is initialized.");
             BindingContext = data;
         }
 

Sources/BookApp/ViewModel/ViewModelManager.cs

@@ -1,14 +1,17 @@
 using Model;
 using System.Collections.ObjectModel;
+using ToolKit;
 using VMWrapper;
-using static System.Runtime.InteropServices.JavaScript.JSType;
 
 namespace BookApp.ViewModel;
 
-public class ViewModelManager
+public class ViewModelManager : BaseViewModel
 {
     BookViewModel _viewModel;
+
     public ObservableCollection<Author> Authors { get; set; } = new ObservableCollection<Author>();
+    public ViewModelMenu ViewModelMenu { get; } = new ViewModelMenu();
+    public ViewModelNavigation ViewModelNavigation { get; } = new ViewModelNavigation();
 
     public ViewModelManager(BookViewModel viewModel)
     {

Sources/BookApp/ViewModel/ViewModelMenu.cs

@@ -4,64 +4,63 @@ namespace BookApp.ViewModel
 {
     public class ViewModelMenu
     {
-        public string Name { get; set; }
+        public ObservableCollection<ViewModelMenuItem> MenuItemsLivre { get; set; }
-        public string Icone { get; set; }
+        public ObservableCollection<ViewModelMenuItem> MenuItemsFiltre { get; set; }
-        public int Number { get; set; }
-        public string Route { get; set; }
-        public bool IsLastItem { get; set; }
 
-        public ViewModelMenu(
+        public ViewModelMenu()
-            string name,
-            string icone,
-            int number,
-            string route,
-            bool isLastItem = false
-        )
         {
-            Name = name;
+            MenuItemsLivre = new ObservableCollection<ViewModelMenuItem>()
-            Icone = icone;
-            Number = number;
-            Route = route;
-            IsLastItem = isLastItem;
-        }
-
-        public ObservableCollection<ViewModelMenu> MyCollections1 { get; set; } =
-            new ObservableCollection<ViewModelMenu>()
             {
-                new ViewModelMenu("Tous", "./Resources/Images/tray_2_fill.svg", 250, "Tous"),
+                new ViewModelMenuItem(
-                new ViewModelMenu(
+                    "Tous",
+                    "../Resources/Images/tray_2_fill.svg",
+                    250,
+                    "TousPage"
+                ),
+                new ViewModelMenuItem(
                     "En prêt",
-                    "./Resources/Images/person_badge_clock_fill.svg",
+                    "../Resources/Images/person_badge_clock_fill.svg",
                     250,
                     "EmpruntsPrets"
                 ),
-                new ViewModelMenu(
+                new ViewModelMenuItem(
                     "À lire plus tard",
-                    "./Resources/Images/arrow_forward.svg",
+                    "../Resources/Images/arrow_forward.svg",
                     250,
                     ""
                 ),
-                new ViewModelMenu(
+                new ViewModelMenuItem(
                     "Statut de lecture",
-                    "./Resources/Images/eyeglasses.svg",
+                    "../Resources/Images/eyeglasses.svg",
                     250,
                     ""
                 ),
-                new ViewModelMenu("Favoris", "./Resources/Images/heart_fill.svg", 250, ""),
+                new ViewModelMenuItem("Favoris", "../Resources/Images/heart_fill.svg", 250, ""),
-                new ViewModelMenu("Étiquettes", "./Resources/Images/tag_fill.svg", 250, "", true),
+                new ViewModelMenuItem(
+                    "Étiquettes",
+                    "../Resources/Images/tag_fill.svg",
+                    250,
+                    "",
+                    true
+                ),
             };
 
-        public ObservableCollection<ViewModelMenu> MyCollections2 { get; set; } =
+            MenuItemsFiltre = new ObservableCollection<ViewModelMenuItem>()
-            new ObservableCollection<ViewModelMenu>()
             {
-                new ViewModelMenu("Auteur", "./Resources/Images/person_fill.svg", 250, "Filtrage"),
+                new ViewModelMenuItem(
-                new ViewModelMenu(
+                    "Auteur",
+                    "../Resources/Images/person_fill.svg",
+                    250,
+                    "Filtrage"
+                ),
+                new ViewModelMenuItem(
                     "Date de publication",
-                    "./Resources/Images/calendar.svg",
+                    "../Resources/Images/calendar.svg",
                     250,
                     ""
                 ),
-                new ViewModelMenu("Note", "./Resources/Images/sparkles.svg", 250, "", true),
+                new ViewModelMenuItem("Note", "../Resources/Images/sparkles.svg", 250, "", true),
             };
+        }
     }
 }

Sources/BookApp/ViewModel/ViewModelMenuItem.cs

@@ -0,0 +1,32 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace BookApp.ViewModel
+{
+    public class ViewModelMenuItem
+    {
+        public string Name { get; set; }
+        public string Icone { get; set; }
+        public int Number { get; set; }
+        public string Route { get; set; }
+        public bool IsLastItem { get; set; }
+
+        public ViewModelMenuItem(
+            string name,
+            string icone,
+            int number,
+            string route,
+            bool isLastItem = false
+        )
+        {
+            Name = name;
+            Icone = icone;
+            Number = number;
+            Route = route;
+            IsLastItem = isLastItem;
+        }
+    }
+}

Sources/BookApp/ViewModel/ViewModelNavigation.cs

@@ -1,32 +1,42 @@
 using ToolKit;
 using System.Windows.Input;
 using System.Collections.ObjectModel;
+using System.ComponentModel;
+using System.Diagnostics;
 
 namespace BookApp.ViewModel
 {
-    public class NavigationViewModel : BaseViewModel
+    public class ViewModelNavigation : BaseViewModel
     {
-        public NavigationViewModel() { }
+        private ViewModelMenuItem _selectedItem;
+        public ViewModelMenuItem SelectedItem
+        {
+            get { return _selectedItem; }
+            set { SetProperty(ref _selectedItem, value); }
+        }
+
+        public ICommand ItemSelectedCommand { get; private set; }
+
+        public ViewModelNavigation()
+        {
+            ItemSelectedCommand = new Command(async () => await OnItemSelected(SelectedItem));
+        }
 
-        private async void OnSelectionChanged(object sender, SelectionChangedEventArgs e)
+        private async Task OnItemSelected(ViewModelMenuItem selectedItem)
         {
-            if (e.CurrentSelection.FirstOrDefault() is ViewModelMenu selectedItem)
+            SelectedItem = selectedItem;
+
+            if (string.IsNullOrEmpty(SelectedItem?.Route))
+                return;
+
+            try
+            {
+                await Shell.Current.GoToAsync(selectedItem.Route);
+                selectedItem = null;
+            }
+            catch (Exception ex)
             {
-                if (!string.IsNullOrWhiteSpace(selectedItem.Route))
+                Debug.WriteLine($"Navigation failed: {ex.Message}");
-                {
-                    Type pageType = Type.GetType("BookApp.Pages." + selectedItem.Route);
-                    if (pageType == null)
-                    {
-                        return;
-                    }
-
-                    Page pageInstance = (Page)Activator.CreateInstance(pageType);
-                    // await Navigation.PushAsync(pageInstance);
-                }
-                else
-                {
-                    Console.WriteLine("Erreur trouvé");
-                }
             }
         }
 

Sources/ToolKit/BaseViewModel.cs

@@ -7,23 +7,22 @@ namespace ToolKit
     {
         public event PropertyChangedEventHandler PropertyChanged;
 
-        protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
+        protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = "") =>
-        {
             PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
-        }
 
-        protected bool SetProperty<T>(
+        protected virtual void SetProperty<T>(
-            ref T backingField,
+            ref T backingStore,
             T value,
-            [CallerMemberName] string propertyName = null
+            [CallerMemberName] string propertyName = "",
+            Action onChanged = null
         )
         {
-            if (EqualityComparer<T>.Default.Equals(backingField, value))
+            if (EqualityComparer<T>.Default.Equals(backingStore, value))
-                return false;
+                return;
 
-            backingField = value;
+            backingStore = value;
+            onChanged?.Invoke();
             OnPropertyChanged(propertyName);
-            return true;
         }
     }
 }