enhance: add move gesture for ImageViewer.

src/Shared/HandyControl_Shared/Controls/Image/ImageViewer.cs

@@ -1,10 +1,12 @@
 using System;
+using System.ComponentModel;
 using System.Diagnostics;
 using System.IO;
 using System.Windows;
 using System.Windows.Controls;
 using System.Windows.Data;
 using System.Windows.Input;
+using System.Windows.Markup;
 using System.Windows.Media;
 using System.Windows.Media.Animation;
 using System.Windows.Media.Imaging;
@@ -99,9 +101,9 @@ public class ImageViewer : Control
     private Point _imgCurrentPoint;
 
     /// <summary>
-    ///     鼠标是否在图片上按下左键
+    ///     鼠标是否在图片上按下
     /// </summary>
-    private bool _imgIsMouseLeftButtonDown;
+    private bool _imgIsMouseDown;
 
     /// <summary>
     ///     在图片上按下时图片的位置
@@ -119,9 +121,9 @@ public class ImageViewer : Control
     private Point _imgSmallCurrentPoint;
 
     /// <summary>
-    ///     鼠标是否在小图片上按下左键
+    ///     鼠标是否在小图片上按下
     /// </summary>
-    private bool _imgSmallIsMouseLeftButtonDown;
+    private bool _imgSmallIsMouseDown;
 
     /// <summary>
     ///     在小图片上按下时图片的位置
@@ -162,6 +164,8 @@ public class ImageViewer : Control
 
     private bool _isLoaded;
 
+    private MouseBinding _mouseMoveBinding;
+
     #endregion Data
 
     #region ctor
@@ -175,6 +179,8 @@ public ImageViewer()
         CommandBindings.Add(new CommandBinding(ControlCommands.Enlarge, ButtonEnlarge_OnClick));
         CommandBindings.Add(new CommandBinding(ControlCommands.RotateLeft, ButtonRotateLeft_OnClick));
         CommandBindings.Add(new CommandBinding(ControlCommands.RotateRight, ButtonRotateRight_OnClick));
+        CommandBindings.Add(new CommandBinding(ControlCommands.MouseMove, ImageMain_OnMouseDown));
+        OnMoveGestureChanged(MoveGesture);
 
         Loaded += (s, e) =>
         {
@@ -235,6 +241,9 @@ private static void OnImageSourceChanged(DependencyObject d, DependencyPropertyC
     public static readonly DependencyProperty IsFullScreenProperty = DependencyProperty.Register(
         nameof(IsFullScreen), typeof(bool), typeof(ImageViewer), new PropertyMetadata(ValueBoxes.FalseBox));
 
+    public static readonly DependencyProperty MoveGestureProperty = DependencyProperty.Register(
+        nameof(MoveGesture), typeof(MouseGesture), typeof(ImageViewer), new UIPropertyMetadata(new MouseGesture(MouseAction.LeftClick), OnMoveGestureChanged));
+
     internal static readonly DependencyProperty ImgPathProperty = DependencyProperty.Register(
         nameof(ImgPath), typeof(string), typeof(ImageViewer), new PropertyMetadata(default(string)));
 
@@ -283,6 +292,14 @@ public bool IsFullScreen
         set => SetValue(IsFullScreenProperty, ValueBoxes.BooleanBox(value));
     }
 
+    [ValueSerializer(typeof(MouseGestureValueSerializer))]
+    [TypeConverter(typeof(MouseGestureConverter))]
+    public MouseGesture MoveGesture
+    {
+        get => (MouseGesture) GetValue(MoveGestureProperty);
+        set => SetValue(MoveGestureProperty, value);
+    }
+
     public bool ShowImgMap
     {
         get => (bool) GetValue(ShowImgMapProperty);
@@ -408,8 +425,6 @@ internal bool ShowBorderBottom
 
     public override void OnApplyTemplate()
     {
-        if (_imageMain != null) _imageMain.MouseLeftButtonDown -= ImageMain_OnMouseLeftButtonDown;
-
         if (_canvasSmallImg != null)
         {
             _canvasSmallImg.MouseLeftButtonDown -= CanvasSmallImg_OnMouseLeftButtonDown;
@@ -430,7 +445,6 @@ public override void OnApplyTemplate()
             var t = new RotateTransform();
             BindingOperations.SetBinding(t, RotateTransform.AngleProperty, new Binding(ImageRotateProperty.Name) { Source = this });
             _imageMain.LayoutTransform = t;
-            _imageMain.MouseLeftButtonDown += ImageMain_OnMouseLeftButtonDown;
         }
 
         if (_canvasSmallImg != null)
@@ -581,12 +595,10 @@ private void ButtonSave_OnClick(object sender, RoutedEventArgs e)
         if (SaveFileDialog.ShowDialog() == true)
         {
             var path = SaveFileDialog.FileName;
-            using (var fileStream = new FileStream(path, FileMode.Create, FileAccess.Write))
-            {
-                var encoder = new PngBitmapEncoder();
-                encoder.Frames.Add(BitmapFrame.Create(ImageSource));
-                encoder.Save(fileStream);
-            }
+            using var fileStream = new FileStream(path, FileMode.Create, FileAccess.Write);
+            var encoder = new PngBitmapEncoder();
+            encoder.Frames.Add(BitmapFrame.Create(ImageSource));
+            encoder.Save(fileStream);
         }
     }
 
@@ -645,14 +657,14 @@ private void OnRenderSizeChanged()
         MoveSmallImg(_imgSmallMouseDownMargin.Left, _imgSmallMouseDownMargin.Top);
     }
 
-    private void ImageMain_OnMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
+    private void ImageMain_OnMouseDown(object sender, ExecutedRoutedEventArgs e)
     {
         _imgMouseDownPoint = Mouse.GetPosition(_panelMain);
         _imgMouseDownMargin = ImageMargin;
-        _imgIsMouseLeftButtonDown = true;
+        _imgIsMouseDown = true;
     }
 
-    protected override void OnPreviewMouseLeftButtonUp(MouseButtonEventArgs e) => _imgIsMouseLeftButtonDown = false;
+    protected override void OnPreviewMouseUp(MouseButtonEventArgs e) => _imgIsMouseDown = false;
 
     /// <summary>
     ///     右下角小图片显示切换
@@ -818,6 +830,14 @@ private void RotateImg(double rotate)
         BeginAnimation(ImageRotateProperty, animation);
     }
 
+    private MouseButtonState GetMouseButtonState() => MoveGesture.MouseAction switch
+    {
+        MouseAction.LeftClick => Mouse.LeftButton,
+        MouseAction.RightClick => Mouse.RightButton,
+        MouseAction.MiddleClick => Mouse.MiddleButton,
+        _ => Mouse.LeftButton
+    };
+
     /// <summary>
     ///     移动图片
     /// </summary>
@@ -827,12 +847,12 @@ private void MoveImg()
         ShowCloseButton = _imgCurrentPoint.Y < 200;
         ShowBorderBottom = _imgCurrentPoint.Y > ActualHeight - 200;
 
-        if (Mouse.LeftButton == MouseButtonState.Released)
+        if (GetMouseButtonState() == MouseButtonState.Released)
         {
             return;
         }
 
-        if (_imgIsMouseLeftButtonDown)
+        if (_imgIsMouseDown)
         {
             var subX = _imgCurrentPoint.X - _imgMouseDownPoint.X;
             var subY = _imgCurrentPoint.Y - _imgMouseDownPoint.Y;
@@ -869,12 +889,12 @@ private void MoveImg()
     /// </summary>
     private void MoveSmallImg()
     {
-        if (!_imgSmallIsMouseLeftButtonDown)
+        if (!_imgSmallIsMouseDown)
         {
             return;
         }
 
-        if (Mouse.LeftButton == MouseButtonState.Released)
+        if (GetMouseButtonState() == MouseButtonState.Released)
         {
             return;
         }
@@ -916,11 +936,23 @@ private void CanvasSmallImg_OnMouseLeftButtonDown(object sender, MouseButtonEven
     {
         _imgSmallMouseDownPoint = Mouse.GetPosition(_canvasSmallImg);
         _imgSmallMouseDownMargin = _borderMove.Margin;
-        _imgSmallIsMouseLeftButtonDown = true;
+        _imgSmallIsMouseDown = true;
         e.Handled = true;
     }
 
-    private void CanvasSmallImg_OnMouseLeftButtonUp(object sender, MouseButtonEventArgs e) => _imgSmallIsMouseLeftButtonDown = false;
+    private void CanvasSmallImg_OnMouseLeftButtonUp(object sender, MouseButtonEventArgs e) => _imgSmallIsMouseDown = false;
 
     private void CanvasSmallImg_OnMouseMove(object sender, MouseEventArgs e) => MoveSmallImg();
+
+    private static void OnMoveGestureChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
+    {
+        ((ImageViewer) d).OnMoveGestureChanged((MouseGesture) e.NewValue);
+    }
+
+    private void OnMoveGestureChanged(MouseGesture newValue)
+    {
+        InputBindings.Remove(_mouseMoveBinding);
+        _mouseMoveBinding = new MouseBinding(ControlCommands.MouseMove, newValue);
+        InputBindings.Add(_mouseMoveBinding);
+    }
 }