107 lines
3.2 KiB
C#
107 lines
3.2 KiB
C#
using Avalonia;
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using Avalonia.Collections;
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using Avalonia.Controls;
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using DataLayer;
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using HangoverAvalonia.ViewModels;
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using NPOI.XSSF.Streaming.Properties;
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using ReactiveUI;
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using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Linq;
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namespace HangoverAvalonia.Controls
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{
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public partial class CheckedListBox : UserControl
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{
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public event EventHandler<ItemCheckEventArgs> ItemCheck;
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public static readonly StyledProperty<IEnumerable> ItemsProperty =
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AvaloniaProperty.Register<CheckedListBox, IEnumerable>(nameof(Items));
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public IEnumerable Items { get => GetValue(ItemsProperty); set => SetValue(ItemsProperty, value); }
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private CheckedListBoxViewModel _viewModel = new();
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public IEnumerable<object> CheckedItems =>
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_viewModel
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.CheckboxItems
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.Where(i => i.IsChecked)
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.Select(i => i.Item);
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public void SetItemChecked(int i, bool isChecked) => _viewModel.CheckboxItems[i].IsChecked = isChecked;
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public void SetItemChecked(object item, bool isChecked)
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{
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var obj = _viewModel.CheckboxItems.SingleOrDefault(i => i.Item == item);
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if (obj is not null)
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obj.IsChecked = isChecked;
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}
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public CheckedListBox()
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{
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InitializeComponent();
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scroller.DataContext = _viewModel;
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_viewModel.CheckedChanged += _viewModel_CheckedChanged;
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}
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private void _viewModel_CheckedChanged(object sender, CheckBoxViewModel e)
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{
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var args = new ItemCheckEventArgs { Item = e.Item, ItemIndex = _viewModel.CheckboxItems.IndexOf(e), IsChecked = e.IsChecked };
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ItemCheck?.Invoke(this, args);
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}
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protected override void OnPropertyChanged(AvaloniaPropertyChangedEventArgs change)
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{
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if (change.Property.Name == nameof(Items) && Items != null)
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_viewModel.SetItems(Items);
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base.OnPropertyChanged(change);
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}
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public class CheckedListBoxViewModel : ViewModelBase
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{
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public event EventHandler<CheckBoxViewModel> CheckedChanged;
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public AvaloniaList<CheckBoxViewModel> CheckboxItems { get; private set; }
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public void SetItems(IEnumerable items)
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{
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UnsubscribeFromItems(CheckboxItems);
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CheckboxItems = new(items.OfType<object>().Select(o => new CheckBoxViewModel { Item = o }));
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SubscribeToItems(CheckboxItems);
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this.RaisePropertyChanged(nameof(CheckboxItems));
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}
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private void SubscribeToItems(IEnumerable objects)
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{
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foreach (var i in objects.OfType<INotifyPropertyChanged>())
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i.PropertyChanged += I_PropertyChanged;
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}
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private void UnsubscribeFromItems(AvaloniaList<CheckBoxViewModel> objects)
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{
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if (objects is null) return;
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foreach (var i in objects)
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i.PropertyChanged -= I_PropertyChanged;
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}
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private void I_PropertyChanged(object sender, PropertyChangedEventArgs e)
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{
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CheckedChanged?.Invoke(this, (CheckBoxViewModel)sender);
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}
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}
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public class CheckBoxViewModel : ViewModelBase
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{
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private bool _isChecked;
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public bool IsChecked { get => _isChecked; set => this.RaiseAndSetIfChanged(ref _isChecked, value); }
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private object _bookText;
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public object Item { get => _bookText; set => this.RaiseAndSetIfChanged(ref _bookText, value); }
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}
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}
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public class ItemCheckEventArgs : EventArgs
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{
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public int ItemIndex { get; init; }
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public bool IsChecked { get; init; }
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public object Item { get; init; }
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}
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}
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