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OrderListPageViewModel.cs
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OrderListPageViewModel.cs
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// ---------------------------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// The MIT License (MIT)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
// ---------------------------------------------------------------------------------
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.UI.Dispatching;
using CommunityToolkit.WinUI;
using Contoso.Models;
namespace Contoso.App.ViewModels
{
/// <summary>
/// Encapsulates data for the OrderListPage. The page UI
/// binds to the properties defined here.
/// </summary>
public class OrderListPageViewModel : BindableBase
{
private DispatcherQueue dispatcherQueue = DispatcherQueue.GetForCurrentThread();
/// <summary>
/// Initializes a new instance of the OrderListPageViewModel class.
/// </summary>
public OrderListPageViewModel() => IsLoading = false;
/// <summary>
/// Gets the unfiltered collection of all orders.
/// </summary>
private List<Order> MasterOrdersList { get; } = new List<Order>();
/// <summary>
/// Gets the orders to display.
/// </summary>
public ObservableCollection<Order> Orders { get; private set; } = new ObservableCollection<Order>();
private bool _isLoading;
/// <summary>
/// Gets or sets a value that specifies whether orders are being loaded.
/// </summary>
public bool IsLoading
{
get => _isLoading;
set => Set(ref _isLoading, value);
}
private Order _selectedOrder;
/// <summary>
/// Gets or sets the selected order.
/// </summary>
public Order SelectedOrder
{
get => _selectedOrder;
set
{
if (Set(ref _selectedOrder, value))
{
// Clear out the existing customer.
SelectedCustomer = null;
if (_selectedOrder != null)
{
Task.Run(() => LoadCustomer(_selectedOrder.CustomerId));
}
OnPropertyChanged(nameof(SelectedOrderGrandTotalFormatted));
}
}
}
/// <summary>
/// Gets a formatted version of the selected order's grand total value.
/// </summary>
public string SelectedOrderGrandTotalFormatted => (SelectedOrder?.GrandTotal ?? 0).ToString("c");
private Customer _selectedCustomer;
/// <summary>
/// Gets or sets the selected customer.
/// </summary>
public Customer SelectedCustomer
{
get => _selectedCustomer;
set => Set(ref _selectedCustomer, value);
}
/// <summary>
/// Loads the specified customer and sets the
/// SelectedCustomer property.
/// </summary>
/// <param name="customerId">The customer to load.</param>
private async void LoadCustomer(Guid customerId)
{
var customer = await App.Repository.Customers.GetAsync(customerId);
await dispatcherQueue.EnqueueAsync(() =>
{
SelectedCustomer = customer;
});
}
/// <summary>
/// Retrieves orders from the data source.
/// </summary>
public async void LoadOrders()
{
await dispatcherQueue.EnqueueAsync(() =>
{
IsLoading = true;
Orders.Clear();
MasterOrdersList.Clear();
});
var orders = await Task.Run(App.Repository.Orders.GetAsync);
await dispatcherQueue.EnqueueAsync(() =>
{
foreach (var order in orders)
{
Orders.Add(order);
MasterOrdersList.Add(order);
}
IsLoading = false;
});
}
/// <summary>
/// Submits a query to the data source.
/// </summary>
public async void QueryOrders(string query)
{
if (!string.IsNullOrWhiteSpace(query))
{
IsLoading = true;
Orders.Clear();
var results = await App.Repository.Orders.GetAsync(query);
await dispatcherQueue.EnqueueAsync(() =>
{
foreach (Order o in results)
{
Orders.Add(o);
}
});
IsLoading = false;
}
}
/// <summary>
/// Deletes the specified order from the database.
/// </summary>
public async Task DeleteOrder(Order orderToDelete) =>
await App.Repository.Orders.DeleteAsync(orderToDelete.Id);
/// <summary>
/// Stores the order suggestions.
/// </summary>
public ObservableCollection<Order> OrderSuggestions { get; } = new ObservableCollection<Order>();
/// <summary>
/// Queries the database and updates the list of new order suggestions.
/// </summary>
public void UpdateOrderSuggestions(string queryText)
{
OrderSuggestions.Clear();
if (!string.IsNullOrEmpty(queryText))
{
string[] parameters = queryText.Split(new char[] { ' ' },
StringSplitOptions.RemoveEmptyEntries);
var resultList = MasterOrdersList
.Where(order => parameters
.Any(parameter =>
order.Address.StartsWith(parameter) ||
order.CustomerName.Contains(parameter) ||
order.InvoiceNumber.ToString().StartsWith(parameter)))
.OrderByDescending(order => parameters
.Count(parameter =>
order.Address.StartsWith(parameter) ||
order.CustomerName.Contains(parameter) ||
order.InvoiceNumber.ToString().StartsWith(parameter)));
foreach (Order order in resultList)
{
OrderSuggestions.Add(order);
}
}
}
}
}