chuan/Ursa.Avalonia
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feat: add stretch.

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This commit is contained in:
rabbitism
2023-07-31 23:58:03 +08:00
parent 3e3fe0a4b7
commit fbede4004b
1 changed files with 30 additions and 3 deletions
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33
src/Ursa/Controls/ImageViewer/ImageViewer.cs
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@@ -90,7 +90,15 @@ public class ImageViewer: TemplatedControl
get => GetValue(LargeChangeProperty);
set => SetValue(LargeChangeProperty, value);
}
public static readonly StyledProperty<Stretch> StretchProperty =
Image.StretchProperty.AddOwner<ImageViewer>(new StyledPropertyMetadata<Stretch>(Stretch.Uniform));
public Stretch Stretch
{
get => GetValue(StretchProperty);
set => SetValue(StretchProperty, value);
}
static ImageViewer()
{
@@ -99,6 +107,7 @@ public class ImageViewer: TemplatedControl
SourceProperty.Changed.AddClassHandler<ImageViewer>((o, e) => o.OnSourceChanged(e));
TranslateXProperty.Changed.AddClassHandler<ImageViewer>((o,e)=>o.OnTranslateXChanged(e));
TranslateYProperty.Changed.AddClassHandler<ImageViewer>((o, e) => o.OnTranslateYChanged(e));
StretchProperty.Changed.AddClassHandler<ImageViewer>((o, e) => o.OnStretchChanged(e));
}
private void OnTranslateYChanged(AvaloniaPropertyChangedEventArgs args)
@@ -149,7 +158,25 @@ public class ImageViewer: TemplatedControl
_image.Width = size.Width;
_image.Height = size.Height;
}
Scale = Math.Max(width/size.Width, height/size.Height);
Scale = GetScaleRatio(width/size.Width, height/size.Height, this.Stretch);
}
private void OnStretchChanged(AvaloniaPropertyChangedEventArgs args)
{
var stretch = args.GetNewValue<Stretch>();
Scale = GetScaleRatio(Width / _image!.Width, Height / _image!.Height, stretch);
}
private double GetScaleRatio(double widthRatio, double heightRatio, Stretch stretch)
{
return stretch switch
{
Stretch.Fill => 1d,
Stretch.None => 1d,
Stretch.Uniform => Math.Min(widthRatio, heightRatio),
Stretch.UniformToFill => Math.Max(widthRatio, heightRatio),
_ => 1d,
};
}
protected override void OnApplyTemplate(TemplateAppliedEventArgs e)
@@ -164,7 +191,7 @@ public class ImageViewer: TemplatedControl
double height = this.Height;
_image.Width = size.Width;
_image.Height = size.Height;
Scale = Math.Max(width/size.Width, height/size.Height);
Scale = GetScaleRatio(width/size.Width, height/size.Height, this.Stretch);
}
if (Overlayer is { } c)
{