【WPF】MVVMパターンを採用してツールを作成してみる

public class TestViewModel : ViewModel
{
    public bool IsEnable { get; set; }
}

<CheckBox Content="テスト" IsChecked="{Binding Path=IsEnable}"/>

public class TestViewModel : ViewModel
{
    public ICommand TestCommand { get; }
}

<Button Content="テスト" Command="{Binding Path=TestCommand}"/>

#nullable enable

using System.Collections.ObjectModel;

namespace TestMvvm;

public class SoundListData
{
    public SoundListData()
    {
        Sounds = new( _sounds );
    }

    internal void AddSound(SoundData data)
    {
        _sounds.Add(data);
    }

    internal void Release()
    {
        _sounds.Clear();
    }

    internal ReadOnlyObservableCollection<SoundData> Sounds { get; private set; }

    private ObservableCollection<SoundData> _sounds = new ObservableCollection<SoundData>();
}

#nullable enable

using System.Collections.ObjectModel;
using System.Collections.Specialized;

using Livet;

namespace TestMvvm;

public class SoundListViewModel : ViewModel
{
    public SoundListViewModel(SoundListData data)
    {
        CompositeDisposable.Add(release);

        _data = data;
        SoundItems = new();

        if (_data.Sounds is INotifyCollectionChanged collectionChanged)
            collectionChanged.CollectionChanged += onSoundListChanged;

        SelectedItem = null;
    }

　　internal void AddSounds(string path)
    {
        _data.AddSound(new(path));
    }

    private void onSoundListChanged(object? sender, NotifyCollectionChangedEventArgs e)
    {
        switch( e.Action ) {
		case NotifyCollectionChangedAction.Add:
            if (e.NewItems is not null && e.NewItems.Count > 0)
            {
                foreach　(var item in e.NewItems)
                {
                    if　(item is SoundData data)
                    {
                        SoundItems.Add(new(data));
                    }
                }
                RaisePropertyChanged(nameof(SoundItems));
            }
            break;
        }
    }

    private void release()
    {
        if (_data.Sounds is INotifyCollectionChanged collectionChanged)
            collectionChanged.CollectionChanged -= onSoundListChanged;

        SoundItems.Clear();
        _data.Release();
    }

    public ObservableCollection<SoundItemViewModel> SoundItems { get; private set; }
    public SoundItemViewModel? SelectedItem
    {
        get => selectedItem;
        set => RaisePropertyChangedIfSet<SoundItemViewModel?>(ref selectedItem, value, nameof(SelectedItem));
    }

    private SoundItemViewModel? selectedItem = null;
    private SoundListData _data;
}

<UserControl x:Class="TestMvvm.SoundListView"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:TestMvvm"
             AllowDrop="True"
             PreviewDragOver="onPreviewDragOver"
             Drop="onDrop"
             Background="DimGray">

    <UserControl.Resources>
        <ResourceDictionary>
            <DataTemplate x:Key="_name">
                <TextBlock Text="{Binding Path=Name}" />
            </DataTemplate>

            <GridView	x:Key="_gridView"	x:Shared="False">
                <GridViewColumn Header="SoundName"
                                Width="150"
                                CellTemplate="{StaticResource _name}"/>
            </GridView>
        </ResourceDictionary>
    </UserControl.Resources>
    
    <Grid>
        <ListView Margin="5"
                  HorizontalAlignment="Stretch"
                  Visibility="Visible"
                  SelectionMode="Single"
                  SelectedItem="{Binding Path=SelectedItem}"
                  ItemsSource="{Binding Path=SoundItems, Mode=OneWay}"
                  View="{StaticResource ResourceKey=_gridView}"/>
    </Grid>
</UserControl>

SelectedItem="{Binding Path=SelectedItem}"