using System; using System.Globalization; using Avalonia; using Avalonia.Controls; using Avalonia.Interactivity; using Avalonia.Media; using Avalonia.Media.Imaging; namespace SourceGit.Views { public class Avatar : Control, Models.IAvatarHost { private static readonly GradientStops[] FALLBACK_GRADIENTS = [ new GradientStops() { new GradientStop(Colors.Orange, 0), new GradientStop(Color.FromRgb(255, 213, 134), 1) }, new GradientStops() { new GradientStop(Colors.DodgerBlue, 0), new GradientStop(Colors.LightSkyBlue, 1) }, new GradientStops() { new GradientStop(Colors.LimeGreen, 0), new GradientStop(Color.FromRgb(124, 241, 124), 1) }, new GradientStops() { new GradientStop(Colors.Orchid, 0), new GradientStop(Color.FromRgb(248, 161, 245), 1) }, new GradientStops() { new GradientStop(Colors.Tomato, 0), new GradientStop(Color.FromRgb(252, 165, 150), 1) }, ]; public static readonly StyledProperty UserProperty = AvaloniaProperty.Register(nameof(User)); public Models.User User { get => GetValue(UserProperty); set => SetValue(UserProperty, value); } static Avatar() { UserProperty.Changed.AddClassHandler(OnUserPropertyChanged); } public Avatar() { var refetch = new MenuItem() { Header = App.Text("RefetchAvatar") }; refetch.Click += (_, _) => { if (User != null) Models.AvatarManager.Instance.Request(User.Email, true); }; ContextMenu = new ContextMenu(); ContextMenu.Items.Add(refetch); RenderOptions.SetBitmapInterpolationMode(this, BitmapInterpolationMode.HighQuality); } public override void Render(DrawingContext context) { if (User == null) return; var corner = (float)Math.Max(2, Bounds.Width / 16); var img = Models.AvatarManager.Instance.Request(User.Email, false); if (img != null) { var rect = new Rect(0, 0, Bounds.Width, Bounds.Height); context.PushClip(new RoundedRect(rect, corner)); context.DrawImage(img, rect); } else { Point textOrigin = new Point((Bounds.Width - _fallbackLabel.Width) * 0.5, (Bounds.Height - _fallbackLabel.Height) * 0.5); context.DrawRectangle(_fallbackBrush, null, new Rect(0, 0, Bounds.Width, Bounds.Height), corner, corner); context.DrawText(_fallbackLabel, textOrigin); } } public void OnAvatarResourceChanged(string email) { if (User.Email.Equals(email, StringComparison.Ordinal)) InvalidateVisual(); } protected override void OnLoaded(RoutedEventArgs e) { base.OnLoaded(e); Models.AvatarManager.Instance.Subscribe(this); } protected override void OnUnloaded(RoutedEventArgs e) { base.OnUnloaded(e); Models.AvatarManager.Instance.Unsubscribe(this); } private static void OnUserPropertyChanged(Avatar avatar, AvaloniaPropertyChangedEventArgs e) { if (avatar.User == null) return; var placeholder = string.IsNullOrWhiteSpace(avatar.User.Name) ? "?" : avatar.User.Name.Substring(0, 1); var chars = placeholder.ToCharArray(); var sum = 0; foreach (var c in chars) sum += Math.Abs(c); avatar._fallbackBrush = new LinearGradientBrush { GradientStops = FALLBACK_GRADIENTS[sum % FALLBACK_GRADIENTS.Length], StartPoint = new RelativePoint(0, 0, RelativeUnit.Relative), EndPoint = new RelativePoint(0, 1, RelativeUnit.Relative), }; var fontFamily = avatar.FindResource("Fonts.Monospace") as FontFamily; var typeface = new Typeface(fontFamily); avatar._fallbackLabel = new FormattedText( placeholder, CultureInfo.CurrentCulture, FlowDirection.LeftToRight, typeface, avatar.Width * 0.65, Brushes.White); avatar.InvalidateVisual(); } private FormattedText _fallbackLabel = null; private LinearGradientBrush _fallbackBrush = null; } }