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feat: make scale/translate controllable.

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This commit is contained in:
rabbitism
2023-07-31 17:28:51 +08:00
parent dc254eb4c3
commit 0b9f920b59
3 changed files with 134 additions and 28 deletions
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12
src/Ursa.Themes.Semi/Controls/ImageViewer.axaml
View File

@@ -4,12 +4,15 @@
xmlns:u="https://irihi.tech/ursa">
<!-- Add Resources Here -->
<ControlTheme x:Key="{x:Type u:ImageViewer}" TargetType="u:ImageViewer">
<Setter Property="Background" Value="LightGray" />
<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}">
<Border Background="{TemplateBinding Background}" ClipToBounds="True">
<Image
Name="{x:Static u:ImageViewer.PART_Image}"
Source="{TemplateBinding Source}"
Stretch="Uniform">
<Image.RenderTransform>
<TransformGroup>
<ScaleTransform ScaleX="{Binding Scale, RelativeSource={RelativeSource TemplatedParent}}" ScaleY="{Binding Scale, RelativeSource={RelativeSource TemplatedParent}}" />
@@ -22,5 +25,8 @@
</VisualLayerManager>
</ControlTemplate>
</Setter>
<Style Selector="^:moving">
<Setter Property="Cursor" Value="Hand" />
</Style>
</ControlTheme>
</ResourceDictionary>

90
src/Ursa/Controls/ImageViewer/ImageViewer.cs
View File

@@ -4,25 +4,28 @@ using Avalonia.Controls.Metadata;
using Avalonia.Controls.Primitives;
using Avalonia.Input;
using Avalonia.Media;
using Avalonia.Media.Imaging;
namespace Ursa.Controls;
[TemplatePart(PART_Image, typeof(Image))]
[TemplatePart(PART_Layer, typeof(VisualLayerManager))]
[PseudoClasses(PC_Moving)]
public class ImageViewer: TemplatedControl
{
public const string PART_Image = "PART_Image";
public const string PART_Layer = "PART_Layer";
public const string PC_Moving = ":moving";
private Image _image = null!;
private Image? _image = null!;
private VisualLayerManager? _layer;
private Point? _lastClickPoint;
private Point? _lastReleasePoint;
private Point? _lastlocation;
public static readonly StyledProperty<object?> OverlayerProperty = AvaloniaProperty.Register<ImageViewer, object?>(
public static readonly StyledProperty<Control?> OverlayerProperty = AvaloniaProperty.Register<ImageViewer, Control?>(
nameof(Overlayer));
public object? Overlayer
public Control? Overlayer
{
get => GetValue(OverlayerProperty);
set => SetValue(OverlayerProperty, value);
@@ -38,34 +41,35 @@ public class ImageViewer: TemplatedControl
private double _scale = 1;
public static readonly DirectProperty<ImageViewer, double> ScaleProperty = AvaloniaProperty.RegisterDirect<ImageViewer, double>(
nameof(Scale), o => o.Scale, unsetValue: 1);
nameof(Scale), o => o.Scale, (o,v)=> o.Scale = v, unsetValue: 1);
public double Scale
{
get => _scale;
private set => SetAndRaise(ScaleProperty, ref _scale, value);
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);
nameof(TranslateX), o => o.TranslateX, (o,v)=>o.TranslateX = v, unsetValue: 0);
public double TranslateX
{
get => _translateX;
private set => SetAndRaise(TranslateXProperty, ref _translateX, value);
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 static readonly DirectProperty<ImageViewer, double> TranslateYProperty =
AvaloniaProperty.RegisterDirect<ImageViewer, double>(
nameof(TranslateY), o => o.TranslateY, (o, v) => o.TranslateY = v, unsetValue: 0);
public double TranslateY
{
get => _translateY;
private set => SetAndRaise(TranslateYProperty, ref _translateY, value);
set => SetAndRaise(TranslateYProperty, ref _translateY, value);
}
@@ -73,12 +77,42 @@ public class ImageViewer: TemplatedControl
{
OverlayerProperty.Changed.AddClassHandler<ImageViewer>((o, e) => o.OnOverlayerChanged(e));
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));
}
private void OnTranslateYChanged(AvaloniaPropertyChangedEventArgs args)
{
if (PseudoClasses.Contains(PC_Moving)) return;
var newValue = args.GetNewValue<double>();
if (_lastlocation is not null)
{
_lastlocation = _lastlocation.Value.WithY(newValue);
}
else
{
_lastlocation = new Point(0, newValue);
}
}
private void OnTranslateXChanged(AvaloniaPropertyChangedEventArgs args)
{
if (PseudoClasses.Contains(PC_Moving)) return;
var newValue = args.GetNewValue<double>();
if (_lastlocation is not null)
{
_lastlocation = _lastlocation.Value.WithX(newValue);
}
else
{
_lastlocation = new Point(newValue, 0);
}
}
private void OnOverlayerChanged(AvaloniaPropertyChangedEventArgs args)
{
var control = args.GetNewValue<object?>();
if (control is Control c)
var control = args.GetNewValue<Control?>();
if (control is { } c)
{
AdornerLayer.SetAdorner(this, c);
}
@@ -90,7 +124,12 @@ public class ImageViewer: TemplatedControl
Size size = image.Size;
double width = this.Width;
double height = this.Height;
Scale = Math.Min(width/size.Width, height/size.Height);
if (_image is not null)
{
_image.Width = size.Width;
_image.Height = size.Height;
}
Scale = Math.Max(width/size.Width, height/size.Height);
}
protected override void OnApplyTemplate(TemplateAppliedEventArgs e)
@@ -98,8 +137,16 @@ public class ImageViewer: TemplatedControl
base.OnApplyTemplate(e);
_image = e.NameScope.Get<Image>(PART_Image);
_layer = e.NameScope.Get<VisualLayerManager>(PART_Layer);
Scale = 1;
if (Overlayer is Control c)
if (Source is { } i)
{
Size size = i.Size;
double width = this.Width;
double height = this.Height;
_image.Width = size.Width;
_image.Height = size.Height;
Scale = Math.Max(width/size.Width, height/size.Height);
}
if (Overlayer is { } c)
{
AdornerLayer.SetAdorner(this, c);
}
@@ -128,13 +175,13 @@ public class ImageViewer: TemplatedControl
base.OnPointerMoved(e);
if (e.Pointer.Captured == this && _lastClickPoint != null)
{
PseudoClasses.Set(PC_Moving, true);
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);
TranslateX = deltaX + (_lastlocation?.X ?? 0);
TranslateY = deltaY + (_lastlocation?.Y ?? 0);
}
}
protected override void OnPointerPressed(PointerPressedEventArgs e)
@@ -148,6 +195,7 @@ public class ImageViewer: TemplatedControl
{
base.OnPointerReleased(e);
e.Pointer.Capture(null);
_lastReleasePoint = new Point(TranslateX, TranslateY);
_lastlocation = new Point(TranslateX, TranslateY);
PseudoClasses.Set(PC_Moving, false);
}
}