Wino-Mail/Wino.Mail.WinUI/MenuFlyouts/MoveButtonFlyout.cs

using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.UI.Xaml;
using Microsoft.UI.Xaml.Controls;
using Windows.Foundation;
using Wino.Core.Domain.Entities.Mail;
using Wino.Mail.WinUI.Controls;

namespace Wino.MenuFlyouts;

public class MoveButtonMenuItemClickedEventArgs
{
    public Guid ClickedFolderId { get; set; }
}

public partial class MoveButtonFlyout : WinoMenuFlyout
{
    public event TypedEventHandler<MoveButtonFlyout, MoveButtonMenuItemClickedEventArgs> MenuItemClick = delegate { };
    public static readonly DependencyProperty FoldersProperty = DependencyProperty.Register(nameof(Folders), typeof(List<MailItemFolder>), typeof(MoveButtonFlyout), new PropertyMetadata(null, new PropertyChangedCallback(OnFoldersChanged)));

    public List<MailItemFolder> Folders
    {
        get { return (List<MailItemFolder>)GetValue(FoldersProperty); }
        set { SetValue(FoldersProperty, value); }
    }

    private static void OnFoldersChanged(DependencyObject obj, DependencyPropertyChangedEventArgs args)
    {
        if (obj is MoveButtonFlyout menu)
        {
            menu.InitializeMenu();
        }
    }

    private void InitializeMenu()
    {
        Dispose();

        Items.Clear();

        if (Folders == null || !Folders.Any())
            return;

        // TODO: Child folders.

        foreach (var item in Folders)
        {
            // We don't expect this, but it crashes startup.
            // Just to be on the safe side.
            if (item.FolderName != null)
            {
                var folderMenuItem = new MenuFlyoutItem()
                {
                    Tag = item,
                    Text = item.FolderName
                };

                folderMenuItem.Click += MenuItemClicked;

                Items.Add(folderMenuItem);
            }
        }
    }

    private void MenuItemClicked(object sender, RoutedEventArgs e)
    {
        var clickedFolder = ((MenuFlyoutItem)sender).Tag as MailItemFolder ?? throw new InvalidOperationException("Clicked folder is null.");

        MenuItemClick?.Invoke(this, new MoveButtonMenuItemClickedEventArgs()
        {
            ClickedFolderId = clickedFolder.Id
        });
    }

    public void Dispose()
    {
        foreach (var item in Items)
        {
            if (item is MenuFlyoutItem menuItem)
            {
                menuItem.Click -= MenuItemClicked;
            }
        }
    }
}