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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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+
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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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+
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+ public event EventHandler Invalidated;
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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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+ private void SourceRectChanged(AvaloniaPropertyChangedEventArgs e) => Invalidated?.Invoke(this, e);
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+
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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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-
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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