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Merge pull request #10 from wmchuang/master
feat: ImageBrushLoader
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,48 @@ | ||
| using System; | ||
| using System.Reactive.Linq; | ||
| using AsyncImageLoader.Loaders; | ||
| using Avalonia; | ||
| using Avalonia.Media; | ||
|
|
||
| namespace AsyncImageLoader { | ||
| public static class ImageBrushLoader { | ||
| public static IAsyncImageLoader AsyncImageLoader { get; set; } = new RamCachedWebImageLoader(); | ||
| static ImageBrushLoader() { | ||
| SourceProperty.Changed | ||
| .Where(args => args.IsEffectiveValueChange) | ||
| .Subscribe(args => OnSourceChanged((ImageBrush)args.Sender, args.NewValue.Value)); | ||
| } | ||
|
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| private static async void OnSourceChanged(ImageBrush sender, string? url) { | ||
| SetIsLoading(sender, true); | ||
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| var bitmap = url == null | ||
| ? null | ||
| : await AsyncImageLoader.ProvideImageAsync(url); | ||
| if (GetSource(sender) != url) return; | ||
| sender.Source = bitmap; | ||
|
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| SetIsLoading(sender, false); | ||
| } | ||
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| public static readonly AttachedProperty<string?> SourceProperty = AvaloniaProperty.RegisterAttached<ImageBrush, string?>("Source", typeof(ImageLoader)); | ||
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| public static string? GetSource(ImageBrush element) { | ||
| return element.GetValue(SourceProperty); | ||
| } | ||
|
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| public static void SetSource(ImageBrush element, string? value) { | ||
| element.SetValue(SourceProperty, value); | ||
| } | ||
|
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| public static readonly AttachedProperty<bool> IsLoadingProperty = AvaloniaProperty.RegisterAttached<ImageBrush, bool>("IsLoading", typeof(ImageLoader)); | ||
|
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| public static bool GetIsLoading(ImageBrush element) { | ||
| return element.GetValue(IsLoadingProperty); | ||
| } | ||
|
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| private static void SetIsLoading(ImageBrush element, bool value) { | ||
| element.SetValue(IsLoadingProperty, value); | ||
| } | ||
| } | ||
| } |