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feature: supports preview and diff with image files

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This commit is contained in:
leo 2024-03-27 21:38:38 +08:00
parent 5ef542f92d
commit 6950055f24
9 changed files with 268 additions and 51 deletions
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104
src/SourceGit/Views/DiffView.axaml.cs
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@ -1,7 +1,111 @@
using System;
using Avalonia;
using Avalonia.Controls;
using Avalonia.Media;
using Avalonia.Media.Imaging;
namespace SourceGit.Views
{
public class ImageDiffView : Control
{
public static readonly StyledProperty<double> AlphaProperty =
AvaloniaProperty.Register<ImageDiffView, double>(nameof(Alpha), 0.5);
public double Alpha
{
get => GetValue(AlphaProperty);
set => SetValue(AlphaProperty, value);
}
public static readonly StyledProperty<Bitmap> OldImageProperty =
AvaloniaProperty.Register<ImageDiffView, Bitmap>(nameof(OldImage), null);
public Bitmap OldImage
{
get => GetValue(OldImageProperty);
set => SetValue(OldImageProperty, value);
}
public static readonly StyledProperty<Bitmap> NewImageProperty =
AvaloniaProperty.Register<ImageDiffView, Bitmap>(nameof(NewImage), null);
public Bitmap NewImage
{
get => GetValue(NewImageProperty);
set => SetValue(NewImageProperty, value);
}
static ImageDiffView()
{
AffectsMeasure<ImageDiffView>(OldImageProperty, NewImageProperty);
AffectsRender<ImageDiffView>(AlphaProperty);
}
public override void Render(DrawingContext context)
{
var alpha = Alpha;
var x = Bounds.Width * Alpha;
var left = OldImage;
if (left != null && alpha > 0)
{
var src = new Rect(0, 0, left.Size.Width * Alpha, left.Size.Height);
var dst = new Rect(0, 0, x, Bounds.Height);
context.DrawImage(left, src, dst);
}
var right = NewImage;
if (right != null)
{
var src = new Rect(right.Size.Width * Alpha, 0, right.Size.Width - right.Size.Width * Alpha, right.Size.Height);
var dst = new Rect(x, 0, Bounds.Width - x, Bounds.Height);
context.DrawImage(right, src, dst);
}
context.DrawLine(new Pen(Brushes.DarkGreen, 2), new Point(x, 0), new Point(x, Bounds.Height));
}
protected override Size MeasureOverride(Size availableSize)
{
var left = OldImage;
var right = NewImage;
if (left != null)
{
return GetDesiredSize(left.Size, availableSize);
}
else if (right != null)
{
return GetDesiredSize(right.Size, availableSize);
}
else
{
return availableSize;
}
}
private Size GetDesiredSize(Size img, Size available)
{
if (img.Width <= available.Width)
{
if (img.Height <= available.Height)
{
return img;
}
else
{
return new Size(available.Height * img.Width / img.Height, available.Height);
}
}
else
{
var s = Math.Max(img.Width / available.Width, img.Height / available.Height);
return new Size(img.Width / s, img.Height / s);
}
}
}
public partial class DiffView : UserControl
{
public DiffView()