port from perforce

intromat/Intromat/Views/Preview2DView.xaml.cs

@@ -0,0 +1,77 @@
+using System;
+using System.Reactive.Disposables;
+using System.Windows;
+using System.Windows.Input;
+using System.Windows.Media;
+using Intromat.Graphics;
+using Intromat.Pipelines;
+using Intromat.ViewModels.Previews;
+using ReactiveUI;
+using SharpDX.Direct3D11;
+using Splat;
+
+namespace Intromat.Views
+{
+    /// <summary>
+    /// Interaction logic for Preview2DView.xaml
+    /// </summary>
+    public partial class Preview2DView : IViewFor<DxTexturePreviewViewModel>
+    {
+        private DisplayTexturePipeline? _pipeline;
+        
+        public static readonly DependencyProperty ViewModelProperty = DependencyProperty.Register(nameof(ViewModel),
+            typeof(DxTexturePreviewViewModel), typeof(Preview2DView), new PropertyMetadata(null));
+
+        public Preview2DView()
+        {
+            InitializeComponent();
+            
+            this.WhenActivated(d =>
+            {
+                _pipeline = Locator.Current.GetService<DisplayTexturePipeline>()!;
+                this.WhenAnyObservable(v => v.ViewModel!.TextureValue).Subscribe(textureValue =>
+                {
+                    var srv = textureValue?.ShaderResourceView;
+                    if (srv != null)
+                    {
+                        _pipeline.ShaderResourceView = srv;
+                        _dxView.Render();
+                    }
+                }).DisposeWith(d);
+                _dxView.SetUpdateHandler(UpdateFrameAction);
+            });
+        }
+
+        private void UpdateFrameAction(Device device, DeviceContext context)
+        {
+            var graphicsAnalysis = Locator.Current.GetService<DxHost>()?._graphicsAnalysis;
+            graphicsAnalysis?.BeginCapture();
+            _pipeline?.Apply();
+            graphicsAnalysis?.EndCapture();
+        }
+
+        private void OnDxViewMouseWheel(object sender, MouseWheelEventArgs e)
+        {
+            var element = (UIElement)sender;
+            var position = e.GetPosition(element);
+            var transform = (MatrixTransform)element.RenderTransform;
+            var matrix = transform.Matrix;
+            var scale = e.Delta >= 0 ? 1.1 : (1.0 / 1.1); // choose appropriate scaling factor
+
+            matrix.ScaleAtPrepend(scale, scale, position.X, position.Y);
+            transform.Matrix = matrix;
+        }
+
+        object? IViewFor.ViewModel
+        {
+            get => ViewModel;
+            set => ViewModel = (DxTexturePreviewViewModel?)value;
+        }
+        
+        public DxTexturePreviewViewModel? ViewModel
+        {
+            get => (DxTexturePreviewViewModel?)GetValue(ViewModelProperty);
+            set => SetValue(ViewModelProperty, value);
+        }
+    }
+}