Decho/Decho/Views/MessageComposerView.axaml.cs

using Avalonia.Controls;
using Avalonia.Input;
using Avalonia.Interactivity;
using Avalonia.Platform.Storage;

using Decho.ViewModels;

namespace Decho.Views;

public partial class MessageComposerView : UserControl
{
    public MessageComposerView()
    {
        InitializeComponent();
        AddHandler(DragDrop.DragOverEvent, OnDragOver);
        AddHandler(DragDrop.DropEvent, OnDrop);
        DragDrop.SetAllowDrop(this, true);
    }

    private async void OnFileUploadClicked(object? sender, RoutedEventArgs e)
    {
        if (DataContext is not MessageComposerViewModel vm)
        {
            return;
        }

        TopLevel? topLevel = TopLevel.GetTopLevel(this);
        if (topLevel?.StorageProvider is null)
        {
            return;
        }

        IReadOnlyList<IStorageFile> files = await topLevel.StorageProvider.OpenFilePickerAsync(new FilePickerOpenOptions
        {
            AllowMultiple = false,
            Title = "Select a file to upload",
        });

        IStorageFile? file = files?.FirstOrDefault();
        if (file?.TryGetLocalPath() is string path)
        {
            vm.RequestFileUpload(path);
        }
    }

    private void OnDragOver(object? sender, DragEventArgs e)
    {
#pragma warning disable CS0618
        if (e.Data.Contains(DataFormats.Files))
        {
#pragma warning restore CS0618
            e.DragEffects = DragDropEffects.Copy;
        }
    }

    private void OnDrop(object? sender, DragEventArgs e)
    {
        if (DataContext is not MessageComposerViewModel vm)
        {
            return;
        }

#pragma warning disable CS0618
        string? paths = e.Data.GetFiles()?
            .Select(f => f.TryGetLocalPath())
            .FirstOrDefault(p => p is not null);
#pragma warning restore CS0618

        if (paths is string path)
        {
            vm.RequestFileUpload(path);
        }
    }
}