JT
1 year ago
6 changed files with 245 additions and 43 deletions
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using Avalonia; |
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using Avalonia.Automation; |
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using Avalonia.Automation.Peers; |
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using Avalonia.Controls; |
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using Avalonia.Controls.Automation.Peers; |
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using Avalonia.Media; |
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using Avalonia.Metadata; |
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namespace StabilityMatrix.Avalonia.Controls; |
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public class BetterImage : Control |
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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<BetterImage, IImage?>(nameof(Source)); |
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/// <summary> |
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/// Defines the <see cref="Stretch"/> property. |
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/// </summary> |
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public static readonly StyledProperty<Stretch> StretchProperty = |
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AvaloniaProperty.Register<BetterImage, Stretch>(nameof(Stretch), Stretch.Uniform); |
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/// <summary> |
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/// Defines the <see cref="StretchDirection"/> property. |
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/// </summary> |
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public static readonly StyledProperty<StretchDirection> StretchDirectionProperty = |
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AvaloniaProperty.Register<BetterImage, StretchDirection>( |
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nameof(StretchDirection), |
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StretchDirection.Both); |
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static BetterImage() |
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{ |
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AffectsRender<BetterImage>(SourceProperty, StretchProperty, StretchDirectionProperty); |
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AffectsMeasure<BetterImage>(SourceProperty, StretchProperty, StretchDirectionProperty); |
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AutomationProperties.ControlTypeOverrideProperty.OverrideDefaultValue<BetterImage>( |
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AutomationControlType.Image); |
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} |
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/// <summary> |
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/// Gets or sets the image that will be displayed. |
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/// </summary> |
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[Content] |
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public IImage? Source |
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{ |
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get { return 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 a value controlling how the image will be stretched. |
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/// </summary> |
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public Stretch Stretch |
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{ |
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get { return GetValue(StretchProperty); } |
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set { SetValue(StretchProperty, value); } |
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} |
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/// <summary> |
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/// Gets or sets a value controlling in what direction the image will be stretched. |
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/// </summary> |
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public StretchDirection StretchDirection |
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{ |
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get { return GetValue(StretchDirectionProperty); } |
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set { SetValue(StretchDirectionProperty, value); } |
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} |
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/// <inheritdoc /> |
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protected override bool BypassFlowDirectionPolicies => true; |
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/// <summary> |
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/// Renders the control. |
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/// </summary> |
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/// <param name="context">The drawing context.</param> |
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public sealed override void Render(DrawingContext context) |
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{ |
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var source = Source; |
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if (source != null && Bounds.Width > 0 && Bounds.Height > 0) |
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{ |
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Rect viewPort = new Rect(Bounds.Size); |
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Size sourceSize = source.Size; |
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Vector scale = Stretch.CalculateScaling(Bounds.Size, sourceSize, StretchDirection); |
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Size scaledSize = sourceSize * scale; |
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Rect destRect = viewPort |
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.CenterRect(new Rect(scaledSize)) |
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.WithX(0) |
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.WithY(0) |
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.Intersect(viewPort); |
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Rect sourceRect = new Rect(sourceSize) |
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.CenterRect(new Rect(destRect.Size / scale)) |
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.WithX(0) |
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.WithY(0); |
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context.DrawImage(source, sourceRect, destRect); |
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} |
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} |
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/// <summary> |
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/// Measures the control. |
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/// </summary> |
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/// <param name="availableSize">The available size.</param> |
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/// <returns>The desired size of the control.</returns> |
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protected override Size MeasureOverride(Size availableSize) |
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{ |
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var source = Source; |
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var result = new Size(); |
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if (source != null) |
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{ |
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result = Stretch.CalculateSize(availableSize, source.Size, StretchDirection); |
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} |
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return result; |
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} |
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/// <inheritdoc/> |
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protected override Size ArrangeOverride(Size finalSize) |
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{ |
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var source = Source; |
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if (source != null) |
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{ |
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var sourceSize = source.Size; |
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var result = Stretch.CalculateSize(finalSize, sourceSize); |
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return result; |
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} |
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else |
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{ |
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return new Size(); |
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} |
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} |
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protected override AutomationPeer OnCreateAutomationPeer() |
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{ |
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return new ImageAutomationPeer(this); |
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} |
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} |
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