119 lines
3.2 KiB
C#
119 lines
3.2 KiB
C#
using Avalonia.Controls;
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using Avalonia.Markup.Xaml;
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using Avalonia.Media.Imaging;
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using LibationAvalonia.ViewModels;
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using ReactiveUI;
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using System.IO;
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using System.Threading.Tasks;
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namespace LibationAvalonia.Dialogs.Login
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{
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public partial class CaptchaDialog : DialogWindow
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{
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public string Password => _viewModel.Password;
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public string Answer => _viewModel.Answer;
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private readonly CaptchaDialogViewModel _viewModel;
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public CaptchaDialog()
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{
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InitializeComponent();
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passwordBox = this.FindControl<TextBox>(nameof(passwordBox));
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captchaBox = this.FindControl<TextBox>(nameof(captchaBox));
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}
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public CaptchaDialog(string password, byte[] captchaImage) :this()
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{
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//Avalonia doesn't support animated gifs.
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//Deconstruct gifs into frames and manually switch them.
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using var gif = SixLabors.ImageSharp.Image.Load(captchaImage);
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var gifEncoder = new SixLabors.ImageSharp.Formats.Gif.GifEncoder();
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var gifFrames = new Bitmap[gif.Frames.Count];
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var frameDelayMs = new int[gif.Frames.Count];
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for (int i = 0; i < gif.Frames.Count; i++)
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{
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var frameMetadata = gif.Frames[i].Metadata.GetFormatMetadata(SixLabors.ImageSharp.Formats.Gif.GifFormat.Instance);
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using var clonedFrame = gif.Frames.CloneFrame(i);
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using var framems = new MemoryStream();
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clonedFrame.Save(framems, gifEncoder);
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framems.Position = 0;
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gifFrames[i] = new Bitmap(framems);
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frameDelayMs[i] = frameMetadata.FrameDelay * 10;
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}
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DataContext = _viewModel = new(password, gifFrames, frameDelayMs);
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Opened += (_, _) => (string.IsNullOrEmpty(password) ? passwordBox : captchaBox).Focus();
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}
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private void InitializeComponent()
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{
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AvaloniaXamlLoader.Load(this);
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}
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protected override async Task SaveAndCloseAsync()
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{
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if (string.IsNullOrWhiteSpace(_viewModel.Password))
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{
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await MessageBox.Show(this, "Please re-enter your password");
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return;
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}
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Serilog.Log.Logger.Information("Submit button clicked: {@DebugInfo}", new { _viewModel.Answer });
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await _viewModel.StopAsync();
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await base.SaveAndCloseAsync();
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}
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protected override async Task CancelAndCloseAsync()
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{
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await _viewModel.StopAsync();
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await base.CancelAndCloseAsync();
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}
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public async void Submit_Click(object sender, Avalonia.Interactivity.RoutedEventArgs e)
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=> await SaveAndCloseAsync();
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}
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public class CaptchaDialogViewModel : ViewModelBase
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{
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public string Answer { get; set; }
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public string Password { get; set; }
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public Bitmap CaptchaImage { get => _captchaImage; private set => this.RaiseAndSetIfChanged(ref _captchaImage, value); }
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private Bitmap _captchaImage;
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private bool keepSwitching = true;
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private readonly Task FrameSwitch;
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public CaptchaDialogViewModel(string password, Bitmap[] gifFrames, int[] frameDelayMs)
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{
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Password = password;
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FrameSwitch = SwitchFramesAsync(gifFrames, frameDelayMs);
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}
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public async Task StopAsync()
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{
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keepSwitching = false;
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await FrameSwitch;
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}
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private async Task SwitchFramesAsync(Bitmap[] gifFrames, int[] frameDelayMs)
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{
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int index = 0;
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while(keepSwitching)
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{
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CaptchaImage = gifFrames[index];
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await Task.Delay(frameDelayMs[index++]);
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index %= gifFrames.Length;
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}
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foreach (var frame in gifFrames)
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frame.Dispose();
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}
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}
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}
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