DelaunayTriangulation/DelauneyTriangulation/Views/MainWindow.axaml.cs

using Avalonia;
using Avalonia.Controls;
using Avalonia.Controls.Shapes;
using Avalonia.Input;
using Avalonia.Interactivity;
using Avalonia.Media;

namespace DelauneyTriangulation.Views;

public partial class MainWindow : Window
{
    private bool _isPanning;
    private Point _panStart;
    private Vector _panOffset = new();
    private readonly TranslateTransform _panTransform = new();
    
    public MainWindow()
    {
        InitializeComponent();
        SceneContent.RenderTransform = _panTransform;
    }
    
    private void OnTitleBarPointerPressed(object? sender, PointerPressedEventArgs e)
    {
        if (!e.GetCurrentPoint(this).Properties.IsLeftButtonPressed) return;
        BeginMoveDrag(e);
    }
    private void OnTitleBarDoubleTapped(object? sender, RoutedEventArgs e) => WindowState = WindowState == WindowState.Maximized ? WindowState.Normal : WindowState.Maximized;
    private void Scene_OnPointerPressed(object? sender, PointerPressedEventArgs e)
    {
        if (!e.GetCurrentPoint(Scene).Properties.IsLeftButtonPressed)
            return;

        _isPanning = true;
        _panStart = e.GetPosition(this);
        Scene.Cursor = new Cursor(StandardCursorType.SizeAll);
        e.Handled = true;
    }

    private void Scene_OnPointerMoved(object? sender, PointerEventArgs e)
    {
        if (!_isPanning) return;

        var pos = e.GetPosition(this);
        var delta = pos - _panStart;
        var current = _panOffset + delta;
        _panTransform.X = current.X;
        _panTransform.Y = current.Y;
        e.Handled = true;
    }

    private void Scene_OnPointerReleased(object? sender, PointerReleasedEventArgs e)
    {
        if (!_isPanning) return;

        var pos = e.GetPosition(this);
        var delta = pos - _panStart;
        _panOffset += delta;

        _isPanning = false;
        Scene.Cursor = new Cursor(StandardCursorType.Arrow);
        e.Handled = true;
    }

    private void Scene_OnWheel(object? sender, PointerWheelEventArgs e)
    {
        
    }
}