VeloeAvaloniaKemonoPartyApplication/VeloeAvaloniaKemonoPartyApp/VeloeAvaloniaKemonoPartyApp/Views/ImageZoomView.axaml.cs

using Avalonia;
using Avalonia.Controls;
using Avalonia.Controls.PanAndZoom;
using Avalonia.Input;
using Avalonia.Interactivity;
using Avalonia.Markup.Xaml;

namespace VeloeAvaloniaKemonoPartyApp.Views;

public partial class ImageZoomView : UserControl
{
    public ImageZoomView()
    {
        InitializeComponent();
    }

    private bool _mousePressed = false;
    private Point _previousPoint;

    public void ZoomImage(object? source, PinchEventArgs args)
    {
        this.GetControl<ZoomBorder>("ZoomBorder").ZoomTo(args.Scale,args.ScaleOrigin.X,args.ScaleOrigin.Y);
    }

    public void ZoomImageEnd(object? source, PinchEndedEventArgs args) 
    {

    }

    public void ZoomImageToDefault(object? source, RoutedEventArgs args) 
    {
        this.GetControl<ZoomBorder>("ZoomBorder").Uniform();
    }

    public void PanStart(object? source, PointerPressedEventArgs args) 
    { 
        _mousePressed = true; 
        _previousPoint = args.GetPosition(this.GetControl<ZoomBorder>("ZoomBorder"));  
    }

    public void PanImage(object? source, PointerEventArgs args)
    {
        if (_mousePressed)
        {
            var zoomBorder = this.GetControl<ZoomBorder>("ZoomBorder");
            var point = args.GetPosition(zoomBorder);
            zoomBorder.PanDelta(point.X-_previousPoint.X,point.Y-_previousPoint.Y);
            _previousPoint = point;
        }
    }

    public void PanStop(object? source, PointerReleasedEventArgs args) 
    { 
        _mousePressed = false; 
    }

}