Changing. Deleting

MauiApp1/Helpers/ChangeTransactionFile.cs

@@ -0,0 +1,55 @@
+using MauiApp1.Model;
+using Newtonsoft.Json;
+using System.Collections.ObjectModel;
+
+namespace MauiApp1.Helpers
+{
+    public class ChangeTransactionFile
+    {
+        static string folder = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
+
+        public static ObservableCollection<Transaction> LoadData(ObservableCollection<Transaction> transactions)
+        {
+            ObservableCollection<Transaction> data;
+            string fileName = "Transactions.json";
+            string path = Path.Combine(folder, fileName);
+            
+            if (!File.Exists(path))
+            {
+                File.Create(path).Close();
+                data = new ObservableCollection<Transaction>();
+            }
+            else
+            {
+                string json = "";
+                using (StreamReader sr = new StreamReader(path))
+                {
+                    json = sr.ReadToEnd();
+                }
+
+                data = JsonConvert.DeserializeObject<ObservableCollection<Transaction>>(json);
+                if (data == null)
+                {
+                    foreach (Transaction transaction in data)
+                    {
+                        transactions.Add(transaction);
+                    }
+                }
+            }
+            return data;
+        }
+         
+        public static void SaveData(ObservableCollection<Transaction> transactions)
+        {
+            string fileName = "Transactions.json";
+            string path = Path.Combine(folder, fileName);
+            string json = JsonConvert.SerializeObject(transactions);
+
+            using (StreamWriter sw = new StreamWriter(path))
+            {
+                sw.WriteLine(json);
+            }
+        }
+
+    }
+}

MauiApp1/MauiApp1.csproj

@@ -57,6 +57,13 @@
 	</ItemGroup>
 
 	<ItemGroup>
+	  <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
+	</ItemGroup>
+
+	<ItemGroup>
+	  <MauiXaml Update="View\AddTransactionView.xaml">
+	    <Generator>MSBuild:Compile</Generator>
+	  </MauiXaml>
 	  <MauiXaml Update="View\CategoryView.xaml">
 	    <Generator>MSBuild:Compile</Generator>
 	  </MauiXaml>

MauiApp1/Model/Transaction.cs

@@ -1,32 +1,65 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
+using System.ComponentModel;
+using Newtonsoft.Json;
 
 namespace MauiApp1.Model
 {
-    public class Transaction
+    public class Transaction : INotifyPropertyChanged
     {
         private string category;
         private float price;
+        private DateTime date;
 
+        [JsonConstructor]
         public Transaction(string category, float price)
         {
             this.category = category;
             this.price = price;
+            date = DateTime.Now;
         }
         
+        [JsonProperty]
+        public DateTime Date
+        {
+            get { return date; }
+            set { date = value; }
+        }
+
+        [JsonProperty]
         public string Category
         {
             get { return category; }
-            set { category = value; }
+            set
+            {
+                if (value != category)
+                {
+                    category = value;
+                    OnPropertyChanged(nameof(Category));
+                }
+            }
         }
 
+        [JsonProperty]
         public float Price
         {
             get { return price; }
-            set { price = value; }
+            set
+            {
+                if (value != price)
+                {
+                    price = value;
+                    OnPropertyChanged(nameof(Price));
+                }
+            }
+        }
+    
+        public event PropertyChangedEventHandler PropertyChanged;
+
+        public void OnPropertyChanged(string property)
+        {
+            if (property != null)
+            {
+                PropertyChanged(this, new(property));
+            }
         }
     }
 }

MauiApp1/View/AddTransactionView.xaml

@@ -7,13 +7,16 @@
         <Label Text="Категория"
                FontSize="Medium"/>
         <Entry Placeholder="Введите данные"
-               Margin="0, 10"/>
+               Margin="0, 10"
+               Text="{Binding CategoryEntry}"/>
 
         <Label Text="Стоимость"
                FontSize="Medium"/>
         <Entry Placeholder="Введите данные"
-               Margin="0, 10"/>
+               Margin="0, 10"
+               Text="{Binding PriceEntry}"/>
 
-        <Button Text="Добавить"/>
+        <Button Text="Добавить"
+                Command="{Binding AddTransactionCommand}"/>
     </VerticalStackLayout>
 </ContentPage>

MauiApp1/View/AddTransactionView.xaml.cs

@@ -1,9 +1,22 @@
+using MauiApp1.ViewModel;
+using System.Collections.ObjectModel;
+using MauiApp1.Model;
+
 namespace MauiApp1.View;
 
 public partial class AddTransactionView : ContentPage
 {
-	public AddTransactionView()
+	public AddTransactionView(ObservableCollection<Transaction> transactions)
 	{
 		InitializeComponent();
+
+		BindingContext = new AddTransactionViewModel(transactions);
+	}
+
+	public AddTransactionView(ObservableCollection<Transaction> transactions, Transaction transaction)
+	{
+        InitializeComponent();
+
+        BindingContext = new AddTransactionViewModel(transactions, transaction);
     }
 }

MauiApp1/View/TransactionView.xaml

@@ -2,19 +2,19 @@
 <ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
              xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
              x:Class="MauiApp1.View.TransactionView"
-             Title="Transactions">
+             Title="Transactions"
+             x:Name="TransactionPage">
     <Grid>
         <Grid.RowDefinitions>
             <RowDefinition Height="Auto"/>
             <RowDefinition/>
         </Grid.RowDefinitions>
 
-        <Button x:Name="btnAddTransaction"
-            Text="Add Transaction"
+        <Button Text="Добавить"
             HorizontalOptions="Center"
             VerticalOptions="Center"
             Margin="20, 10"
-            Command="{Binding AddTransactionCommand}"/>
+            Command="{Binding AddCommand}"/>
 
         <CollectionView ItemsSource="{Binding Transactions}" Grid.Row="1" >
             <CollectionView.ItemTemplate>
@@ -22,27 +22,37 @@
                     <SwipeView>
                         <SwipeView.RightItems>
                             <SwipeItems>
-                                <SwipeItemView>
+                                <SwipeItemView Command="{Binding Path=BindingContext.EditCommand, 
+                                    Source={x:Reference Name=TransactionPage}}" CommandParameter="{Binding .}">
                                     <Frame BackgroundColor="LightGreen"
                                            Margin="5">
-                                        <Label Text="Изменить"/>
+                                        <Label Text="✏️" 
+                                               FontSize="Large" 
+                                               VerticalTextAlignment="Center"
+                                               HorizontalTextAlignment="Center"/>
                                     </Frame>
                                 </SwipeItemView>
 
-                                <SwipeItemView>
-                                    <Frame BackgroundColor="LightCoral"
-                                           Margin="5">
-                                        <Label Text="Удалить"/>
+                                <SwipeItemView Command="{Binding Path=BindingContext.DeleteCommand, 
+                                    Source={x:Reference Name=TransactionPage}}" CommandParameter="{Binding .}">
+                                    <Frame BackgroundColor="LightCoral" Margin="5">
+                                        <Label Text="🗑️" 
+                                               FontSize="Large" 
+                                               VerticalTextAlignment="Center"
+                                               HorizontalTextAlignment="Center"/>
                                     </Frame>
                                 </SwipeItemView>
                             </SwipeItems>
                         </SwipeView.RightItems>
                         
                     <Frame CornerRadius="20" Margin="10" BackgroundColor="{AppThemeBinding Light={StaticResource FrameLight}, Dark={StaticResource FrameDark}}">
+                            <StackLayout Orientation="Vertical">
                                 <StackLayout Orientation="Horizontal">
                                     <Label Text="{Binding Category}" FontSize="Medium" HorizontalOptions="StartAndExpand"/>
                                     <Label Text="{Binding Price}" FontSize="Medium"/>
                                 </StackLayout>
+                                <Label Text="{Binding Date}" FontSize="Micro"/>
+                            </StackLayout>
                     </Frame>
                     </SwipeView>
                 </DataTemplate>

MauiApp1/View/TransactionView.xaml.cs

@@ -7,6 +7,6 @@ public partial class TransactionView : ContentPage
 	{
 		InitializeComponent();
 
-		BindingContext = new TransactionViewModel();
+		BindingContext = new TransactionViewModel(Navigation);
 	}
 }

MauiApp1/ViewModel/AddTransactionViewModel.cs

@@ -1,14 +1,47 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
+using System.Collections.ObjectModel;
+using System.Windows.Input;
+using MauiApp1.Model;
+using MauiApp1.Helpers;
 
 namespace MauiApp1.ViewModel
 {
     public class AddTransactionViewModel
     {
         public string CategoryEntry { get; set; }
-        public float PriceEntery { get; set; }
+        public float PriceEntry { get; set; }
+
+        public ICommand AddTransactionCommand { get; set; }
+        private ObservableCollection<Transaction> transactions;
+        private Transaction transaction;
+        
+        public AddTransactionViewModel(ObservableCollection<Transaction> transactions)
+        {
+            this.transactions = transactions;
+            AddTransactionCommand = new Command(AddTransaction);
+        }
+
+        public AddTransactionViewModel(ObservableCollection<Transaction> transactions, Transaction transaction)
+        {
+            this.transactions = transactions;
+            this.transaction = transaction;
+            AddTransactionCommand = new Command(EditTransaction);
+
+            PriceEntry = transaction.Price;
+            CategoryEntry = transaction.Category;
+        }
+
+        public void AddTransaction()                                                                                
+        {
+            transactions.Insert(0, new Transaction(CategoryEntry, PriceEntry));
+            ChangeTransactionFile.SaveData(transactions);
+        }       
+
+        public void EditTransaction()
+        {
+            transaction.Price = PriceEntry;
+            transaction.Category = CategoryEntry;
+            
+            ChangeTransactionFile.SaveData(transactions);
+        }
     }
 }

MauiApp1/ViewModel/TransactionViewModel.cs

@@ -1,31 +1,47 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-using System.Collections.ObjectModel;
-
+using System.Collections.ObjectModel;
+using System.Windows.Input;
 using MauiApp1.Model;
+using MauiApp1.View;
+using MauiApp1.Helpers;
 
 namespace MauiApp1.ViewModel
 {
     public class TransactionViewModel
     {
         public ObservableCollection<Transaction> Transactions { get; set; }
+                    = new();
 
-        public TransactionViewModel()
+        public ICommand AddCommand { get; set; }
+        public ICommand DeleteCommand { get; set; }
+        public ICommand EditCommand { get; set; }
+
+        private INavigation Navigation;
+
+        public TransactionViewModel(INavigation navigation)
         {
-            Transactions = new ObservableCollection<Transaction>()
+            Navigation = navigation;
+            
+            AddCommand = new Command(async () => await AddTransaction());
+            DeleteCommand = new Command<Transaction>(DeleteTransaction);
+            EditCommand = new Command<Transaction>(async t => await EditTransaction(t));
+
+            Transactions = ChangeTransactionFile.LoadData(Transactions);
+        }
+
+        private void DeleteTransaction(Transaction transaction)
         {
-                new("Транспорт", 79.00f),
-                new("Еда", 2000),
-                new("Кино", 300),
-                new("Транспорт", 79.00f),
-                new("Транспорт", 79.00f),
-                new("Транспорт", 7632.00f),
-                new("Транспорт", 79.00f),
-                new("Транспорт", 79.00f)
-            };
+            Transactions.Remove(transaction);
+            ChangeTransactionFile.SaveData(Transactions);
+        }
+
+        private async Task AddTransaction()
+        {
+            await Navigation.PushAsync(new AddTransactionView(Transactions));
+        }
+
+        private async Task EditTransaction(Transaction transac)
+        {
+            await Navigation.PushAsync(new AddTransactionView(Transactions, transac));
         }
     }
 }