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feat: initialize image viewer, add demo.

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This commit is contained in:
rabbitism
2023-07-31 02:02:14 +08:00
parent e6c0dfbbc6
commit dc254eb4c3
11 changed files with 242 additions and 8 deletions
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26
src/Ursa.Themes.Semi/Controls/ImageViewer.axaml Normal file
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<ResourceDictionary
xmlns="https://github.com/avaloniaui"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:u="https://irihi.tech/ursa">
<!-- Add Resources Here -->
<ControlTheme x:Key="{x:Type u:ImageViewer}" TargetType="u:ImageViewer">
<Setter Property="Template">
<ControlTemplate TargetType="{x:Type u:ImageViewer}">
<VisualLayerManager Name="{x:Static u:ImageViewer.PART_Layer}">
<Border Background="Transparent" ClipToBounds="True">
<Image Name="{x:Static u:ImageViewer.PART_Image}" Source="{TemplateBinding Source}">
<Image.RenderTransform>
<TransformGroup>
<ScaleTransform ScaleX="{Binding Scale, RelativeSource={RelativeSource TemplatedParent}}" ScaleY="{Binding Scale, RelativeSource={RelativeSource TemplatedParent}}" />
<TranslateTransform X="{Binding TranslateX, RelativeSource={RelativeSource TemplatedParent}}" Y="{Binding TranslateY, RelativeSource={RelativeSource TemplatedParent}}" />
<RotateTransform Angle="0" />
</TransformGroup>
</Image.RenderTransform>
</Image>
</Border>
</VisualLayerManager>
</ControlTemplate>
</Setter>
</ControlTheme>
</ResourceDictionary>

1
src/Ursa.Themes.Semi/Controls/_index.axaml
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@@ -6,6 +6,7 @@
<ResourceInclude Source="ButtonGroup.axaml" />
<ResourceInclude Source="Divider.axaml" />
<ResourceInclude Source="DualBadge.axaml" />
<ResourceInclude Source="ImageViewer.axaml" />
<ResourceInclude Source="IPv4Box.axaml" />
<ResourceInclude Source="Loading.axaml" />
<ResourceInclude Source="Navigation.axaml" />

153
src/Ursa/Controls/ImageViewer/ImageViewer.cs Normal file
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using Avalonia;
using Avalonia.Controls;
using Avalonia.Controls.Metadata;
using Avalonia.Controls.Primitives;
using Avalonia.Input;
using Avalonia.Media;
namespace Ursa.Controls;
[TemplatePart(PART_Image, typeof(Image))]
[TemplatePart(PART_Layer, typeof(VisualLayerManager))]
public class ImageViewer: TemplatedControl
{
public const string PART_Image = "PART_Image";
public const string PART_Layer = "PART_Layer";
private Image _image = null!;
private VisualLayerManager? _layer;
private Point? _lastClickPoint;
private Point? _lastReleasePoint;
public static readonly StyledProperty<object?> OverlayerProperty = AvaloniaProperty.Register<ImageViewer, object?>(
nameof(Overlayer));
public object? Overlayer
{
get => GetValue(OverlayerProperty);
set => SetValue(OverlayerProperty, value);
}
public static readonly StyledProperty<IImage?> SourceProperty = Image.SourceProperty.AddOwner<ImageViewer>();
public IImage? Source
{
get => GetValue(SourceProperty);
set => SetValue(SourceProperty, value);
}
private double _scale = 1;
public static readonly DirectProperty<ImageViewer, double> ScaleProperty = AvaloniaProperty.RegisterDirect<ImageViewer, double>(
nameof(Scale), o => o.Scale, unsetValue: 1);
public double Scale
{
get => _scale;
private set => SetAndRaise(ScaleProperty, ref _scale, value);
}
private double _translateX;
public static readonly DirectProperty<ImageViewer, double> TranslateXProperty = AvaloniaProperty.RegisterDirect<ImageViewer, double>(
nameof(TranslateX), o => o.TranslateX, unsetValue: 0);
public double TranslateX
{
get => _translateX;
private set => SetAndRaise(TranslateXProperty, ref _translateX, value);
}
private double _translateY;
public static readonly DirectProperty<ImageViewer, double> TranslateYProperty = AvaloniaProperty.RegisterDirect<ImageViewer, double>(
nameof(TranslateY), o => o.TranslateY);
public double TranslateY
{
get => _translateY;
private set => SetAndRaise(TranslateYProperty, ref _translateY, value);
}
static ImageViewer()
{
OverlayerProperty.Changed.AddClassHandler<ImageViewer>((o, e) => o.OnOverlayerChanged(e));
SourceProperty.Changed.AddClassHandler<ImageViewer>((o, e) => o.OnSourceChanged(e));
}
private void OnOverlayerChanged(AvaloniaPropertyChangedEventArgs args)
{
var control = args.GetNewValue<object?>();
if (control is Control c)
{
AdornerLayer.SetAdorner(this, c);
}
}
private void OnSourceChanged(AvaloniaPropertyChangedEventArgs args)
{
IImage image = args.GetNewValue<IImage>();
Size size = image.Size;
double width = this.Width;
double height = this.Height;
Scale = Math.Min(width/size.Width, height/size.Height);
}
protected override void OnApplyTemplate(TemplateAppliedEventArgs e)
{
base.OnApplyTemplate(e);
_image = e.NameScope.Get<Image>(PART_Image);
_layer = e.NameScope.Get<VisualLayerManager>(PART_Layer);
Scale = 1;
if (Overlayer is Control c)
{
AdornerLayer.SetAdorner(this, c);
}
}
protected override void OnPointerWheelChanged(PointerWheelEventArgs e)
{
base.OnPointerWheelChanged(e);
if(e.Delta.Y > 0)
{
Scale *= 1.1;
}
else
{
var scale = Scale;
scale /= 1.1;
if (scale < 0.1) scale = 0.1;
Scale = scale;
}
}
protected override void OnPointerMoved(PointerEventArgs e)
{
base.OnPointerMoved(e);
if (e.Pointer.Captured == this && _lastClickPoint != null)
{
Point p = e.GetPosition(this);
double deltaX = p.X - _lastClickPoint.Value.X;
double deltaY = p.Y - _lastClickPoint.Value.Y;
TranslateX = deltaX + (_lastReleasePoint?.X ?? 0);
TranslateY = deltaY + (_lastReleasePoint?.Y ?? 0);
}
}
protected override void OnPointerPressed(PointerPressedEventArgs e)
{
base.OnPointerPressed(e);
e.Pointer.Capture(this);
_lastClickPoint = e.GetPosition(this);
}
protected override void OnPointerReleased(PointerReleasedEventArgs e)
{
base.OnPointerReleased(e);
e.Pointer.Capture(null);
_lastReleasePoint = new Point(TranslateX, TranslateY);
}
}