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@ -1,25 +1,77 @@ |
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using System; |
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using System.Collections.Generic; |
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using System.Text; |
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using Avalonia.Visuals.Media.Imaging; |
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namespace Avalonia.Media.Imaging |
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{ |
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public class CroppedBitmap : IImage, IDisposable |
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/// <summary>
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/// Crops a Bitmap.
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/// </summary>
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public class CroppedBitmap : AvaloniaObject, IImage, IAffectsRender, IDisposable |
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{ |
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/// <summary>
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/// Defines the <see cref="Source"/> property.
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/// </summary>
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public static readonly StyledProperty<IImage> SourceProperty = |
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AvaloniaProperty.Register<CroppedBitmap, IImage>(nameof(Source)); |
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/// <summary>
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/// Defines the <see cref="SourceRect"/> property.
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/// </summary>
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public static readonly StyledProperty<PixelRect> SourceRectProperty = |
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AvaloniaProperty.Register<CroppedBitmap, PixelRect>(nameof(SourceRect)); |
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public event EventHandler Invalidated; |
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static CroppedBitmap() |
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{ |
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SourceRectProperty.Changed.AddClassHandler<CroppedBitmap>((x, e) => x.SourceRectChanged(e)); |
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SourceProperty.Changed.AddClassHandler<CroppedBitmap>((x, e) => x.SourceChanged(e)); |
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} |
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/// <summary>
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/// Gets or sets the source for the bitmap.
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/// </summary>
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public IImage Source |
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{ |
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get => GetValue(SourceProperty); |
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set => SetValue(SourceProperty, value); |
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} |
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/// <summary>
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/// Gets or sets the rectangular area that the bitmap is cropped to.
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/// </summary>
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public PixelRect SourceRect |
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{ |
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get => GetValue(SourceRectProperty); |
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set => SetValue(SourceRectProperty, value); |
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} |
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public CroppedBitmap() |
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{ |
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Source = null; |
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SourceRect = default; |
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} |
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public CroppedBitmap(IBitmap source, PixelRect sourceRect) |
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public CroppedBitmap(IImage source, PixelRect sourceRect) |
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{ |
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Source = source; |
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SourceRect = sourceRect; |
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} |
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private void SourceChanged(AvaloniaPropertyChangedEventArgs e) |
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{ |
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if (e.NewValue == null) |
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return; |
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if (!(e.NewValue is IBitmap)) |
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throw new ArgumentException("Only IBitmap supported as source"); |
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Invalidated?.Invoke(this, e); |
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} |
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private void SourceRectChanged(AvaloniaPropertyChangedEventArgs e) => Invalidated?.Invoke(this, e); |
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public virtual void Dispose() |
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{ |
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Source?.Dispose(); |
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(Source as IBitmap)?.Dispose(); |
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} |
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public Size Size { |
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@ -29,7 +81,7 @@ namespace Avalonia.Media.Imaging |
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return Size.Empty; |
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if (SourceRect.IsEmpty) |
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return Source.Size; |
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return SourceRect.Size.ToSizeWithDpi(Source.Dpi); |
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return SourceRect.Size.ToSizeWithDpi((Source as IBitmap).Dpi); |
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} |
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} |
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@ -37,11 +89,8 @@ namespace Avalonia.Media.Imaging |
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{ |
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if (Source == null) |
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return; |
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var topLeft = SourceRect.TopLeft.ToPointWithDpi(Source.Dpi); |
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var topLeft = SourceRect.TopLeft.ToPointWithDpi((Source as IBitmap).Dpi); |
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Source.Draw(context, sourceRect.Translate(new Vector(topLeft.X, topLeft.Y)), destRect, bitmapInterpolationMode); |
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} |
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public IBitmap Source { get; } |
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public PixelRect SourceRect { get; } |
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} |
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} |
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Вадим Мельников
7 years ago