using System;
using Avalonia.Controls;
using Avalonia.Controls.Primitives;
using Notes.Models;
using Notes.ViewModels;

namespace Notes.Views;

public class NoteView : TemplatedControl
{
    //TemplatedControl必须在这监听，比较晚创建，但是实例化是一开始执行的，会找不到子元素
    protected override void OnApplyTemplate(TemplateAppliedEventArgs e)
    {
        base.OnApplyTemplate(e);
        var listBox = e.NameScope.Find<ListBox>("listNotes");
        if (listBox == null) throw new NullReferenceException(nameof(listBox));
        listBox.AddHandler(SelectingItemsControl.SelectionChangedEvent, this.Handler);
    }

    private void Handler(object? sender, SelectionChangedEventArgs e)
    {
        if (e.AddedItems.Count>0)
        {
            var eAddedItem = e.AddedItems[0];
            if (eAddedItem is Note note)
            {
                if (DataContext is NoteViewModel noteViewModel)
                {
                    noteViewModel.SelectedNote = note;
                }
            }
        }
    }
}