first test-flight version

Billing.Shared/Views/BillPage.xaml.cs

@@ -13,6 +13,10 @@ namespace Billing.Views
     {
         private static readonly BindableProperty SelectedDateProperty = BindableProperty.Create(nameof(SelectedDate), typeof(DateTime), typeof(BillPage));
         private static readonly BindableProperty BillsProperty = BindableProperty.Create(nameof(Bills), typeof(List<UIBill>), typeof(BillPage));
+        private static readonly BindableProperty NoBillsProperty = BindableProperty.Create(nameof(NoBills), typeof(bool), typeof(BillPage));
+        private static readonly BindableProperty IncomeProperty = BindableProperty.Create(nameof(Income), typeof(decimal), typeof(BillPage));
+        private static readonly BindableProperty SpendingProperty = BindableProperty.Create(nameof(Spending), typeof(decimal), typeof(BillPage));
+        private static readonly BindableProperty BalanceProperty = BindableProperty.Create(nameof(Balance), typeof(decimal), typeof(BillPage));
 
         public DateTime SelectedDate
         {
@@ -24,12 +28,18 @@ namespace Billing.Views
             get => (List<UIBill>)GetValue(BillsProperty);
             set => SetValue(BillsProperty, value);
         }
+        public bool NoBills => (bool)GetValue(NoBillsProperty);
+        public decimal Income => (decimal)GetValue(IncomeProperty);
+        public decimal Spending => (decimal)GetValue(SpendingProperty);
+        public decimal Balance => (decimal)GetValue(BalanceProperty);
 
         public Command EditBilling { get; }
+        public Command DeleteBilling { get; }
 
         public BillPage()
         {
             EditBilling = new Command(OnEditBilling);
+            DeleteBilling = new Command(OnDeleteBilling);
 
             InitializeComponent();
 
@@ -45,6 +55,17 @@ namespace Billing.Views
                 b.CreateTime.Month == e.Date.Month &&
                 b.CreateTime.Day == e.Date.Day);
             Bills = new List<UIBill>(bills.Select(b => WrapBill(b)));
+            RefreshBalance(Bills);
+        }
+
+        private void RefreshBalance(List<UIBill> bills)
+        {
+            SetValue(NoBillsProperty, bills.Count == 0);
+            var income = bills.Where(b => b.Amount > 0).Sum(b => b.Amount);
+            var spending = -bills.Where(b => b.Amount < 0).Sum(b => b.Amount);
+            SetValue(IncomeProperty, income);
+            SetValue(SpendingProperty, spending);
+            SetValue(BalanceProperty, income - spending);
         }
 
         private UIBill WrapBill(Bill b)
@@ -101,6 +122,31 @@ namespace Billing.Views
             }
         }
 
+        private async void OnDeleteBilling(object o)
+        {
+            if (Tap.IsBusy)
+            {
+                return;
+            }
+            using (Tap.Start())
+            {
+                if (o is UIBill bill)
+                {
+                    var result = await this.ShowConfirm(Resource.ConfirmDeleteBill);
+                    if (result)
+                    {
+                        var bills = Bills;
+                        bills.Remove(bill);
+                        App.Bills.Remove(bill.Bill);
+                        billsLayout.Refresh(bills);
+                        RefreshBalance(bills);
+
+                        _ = Task.Run(App.WriteBills);
+                    }
+                }
+            }
+        }
+
         private void OnBillChecked(object sender, Bill e)
         {
             if (e.Id < 0)
@@ -127,6 +173,7 @@ namespace Billing.Views
                     UpdateBill(bill);
                 }
             }
+            RefreshBalance(Bills);
 
             Task.Run(App.WriteBills);
         }