Pass PointerPressed event to BeginModeDrag and BeginResizeDrag.

samples/ControlCatalog/DecoratedWindow.xaml.cs

@@ -18,18 +18,18 @@ namespace ControlCatalog
         {
             var ctl = this.FindControl<Control>(name);
             ctl.Cursor = new Cursor(cursor);
-            ctl.PointerPressed += delegate
+            ctl.PointerPressed += (i, e) =>
             {
-                PlatformImpl?.BeginResizeDrag(edge);
+                PlatformImpl?.BeginResizeDrag(edge, e);
             };
         }
 
         private void InitializeComponent()
         {
             AvaloniaXamlLoader.Load(this);
-            this.FindControl<Control>("TitleBar").PointerPressed += delegate
+            this.FindControl<Control>("TitleBar").PointerPressed += (i, e) =>
             {
-                PlatformImpl?.BeginMoveDrag();
+                PlatformImpl?.BeginMoveDrag(e);
             };
             SetupSide("Left", StandardCursorType.LeftSide, WindowEdge.West);
             SetupSide("Right", StandardCursorType.RightSide, WindowEdge.East);
@@ -39,7 +39,8 @@ namespace ControlCatalog
             SetupSide("TopRight", StandardCursorType.TopRightCorner, WindowEdge.NorthEast);
             SetupSide("BottomLeft", StandardCursorType.BottomLeftCorner, WindowEdge.SouthWest);
             SetupSide("BottomRight", StandardCursorType.BottomRightCorner, WindowEdge.SouthEast);
-            this.FindControl<Button>("MinimizeButton").Click += delegate { this.WindowState = WindowState.Minimized; };
+            this.FindControl<Button>("MinimizeButton").Click += delegate
+            { this.WindowState = WindowState.Minimized; };
             this.FindControl<Button>("MaximizeButton").Click += delegate
             {
                 WindowState = WindowState == WindowState.Maximized ? WindowState.Normal : WindowState.Maximized;

src/Avalonia.Controls/Platform/IWindowImpl.cs

@@ -3,6 +3,7 @@
 
 using System;
 using Avalonia.Controls;
+using Avalonia.Input;
 
 namespace Avalonia.Platform
 {
@@ -57,28 +58,28 @@ namespace Avalonia.Platform
         /// Return true to prevent the underlying implementation from closing.
         /// </summary>
         Func<bool> Closing { get; set; }
-        
+
         /// <summary>
         /// Starts moving a window with left button being held. Should be called from left mouse button press event handler.
         /// </summary>
-        void BeginMoveDrag();
+        void BeginMoveDrag(PointerPressedEventArgs e);
 
         /// <summary>
         /// Starts resizing a window. This function is used if an application has window resizing controls. 
         /// Should be called from left mouse button press event handler
         /// </summary>
-        void BeginResizeDrag(WindowEdge edge);
-        
+        void BeginResizeDrag(WindowEdge edge, PointerPressedEventArgs e);
+
         /// <summary>
         /// Sets the client size of the top level.
         /// </summary>
         void Resize(Size clientSize);
-        
+
         /// <summary>
         /// Sets the client size of the top level.
         /// </summary>
         void Move(PixelPoint point);
-        
+
         /// <summary>
         /// Minimum width of the window.
         /// </summary>

src/Avalonia.Controls/Window.cs

@@ -261,13 +261,13 @@ namespace Avalonia.Controls
         /// <summary>
         /// Starts moving a window with left button being held. Should be called from left mouse button press event handler
         /// </summary>
-        public void BeginMoveDrag() => PlatformImpl?.BeginMoveDrag();
+        public void BeginMoveDrag(PointerPressedEventArgs e) => PlatformImpl?.BeginMoveDrag(e);
 
         /// <summary>
         /// Starts resizing a window. This function is used if an application has window resizing controls. 
         /// Should be called from left mouse button press event handler
         /// </summary>
-        public void BeginResizeDrag(WindowEdge edge) => PlatformImpl?.BeginResizeDrag(edge);
+        public void BeginResizeDrag(WindowEdge edge, PointerPressedEventArgs e) => PlatformImpl?.BeginResizeDrag(edge, e);
         
         /// <summary>
         /// Carries out the arrange pass of the window.

src/Avalonia.DesignerSupport/Remote/PreviewerWindowImpl.cs

@@ -2,6 +2,7 @@
 using System.Reactive.Disposables;
 using Avalonia.Controls;
 using Avalonia.Controls.Remote.Server;
+using Avalonia.Input;
 using Avalonia.Platform;
 using Avalonia.Remote.Protocol;
 using Avalonia.Remote.Protocol.Viewport;
@@ -27,11 +28,11 @@ namespace Avalonia.DesignerSupport.Remote
         {
         }
 
-        public void BeginMoveDrag()
+        public void BeginMoveDrag(PointerPressedEventArgs e)
         {
         }
 
-        public void BeginResizeDrag(WindowEdge edge)
+        public void BeginResizeDrag(WindowEdge edge, PointerPressedEventArgs e)
         {
         }
 

src/Avalonia.DesignerSupport/Remote/Stubs.cs

@@ -46,7 +46,7 @@ namespace Avalonia.DesignerSupport.Remote
                         Resize(size);
                     }));
         }
-        
+
         public IRenderer CreateRenderer(IRenderRoot root) => new ImmediateRenderer(root);
         public void Dispose()
         {
@@ -75,11 +75,11 @@ namespace Avalonia.DesignerSupport.Remote
         {
         }
 
-        public void BeginMoveDrag()
+        public void BeginMoveDrag(PointerPressedEventArgs e)
         {
         }
 
-        public void BeginResizeDrag(WindowEdge edge)
+        public void BeginResizeDrag(WindowEdge edge, PointerPressedEventArgs e)
         {
         }
 
@@ -93,7 +93,7 @@ namespace Avalonia.DesignerSupport.Remote
 
         public void Move(PixelPoint point)
         {
-            
+
         }
 
         public IScreenImpl Screen { get; } = new ScreenStub();
@@ -153,7 +153,7 @@ namespace Avalonia.DesignerSupport.Remote
         {
             public void Save(Stream outputStream)
             {
-                
+
             }
         }
 
@@ -167,10 +167,10 @@ namespace Avalonia.DesignerSupport.Remote
     class SystemDialogsStub : ISystemDialogImpl
     {
         public Task<string[]> ShowFileDialogAsync(FileDialog dialog, IWindowImpl parent) =>
-            Task.FromResult((string[]) null);
+            Task.FromResult((string[])null);
 
         public Task<string> ShowFolderDialogAsync(OpenFolderDialog dialog, IWindowImpl parent) =>
-            Task.FromResult((string) null);
+            Task.FromResult((string)null);
     }
 
     class ScreenStub : IScreenImpl

src/Avalonia.Native/WindowImplBase.cs

@@ -301,7 +301,7 @@ namespace Avalonia.Native
             _native.Hide();
         }
 
-        public void BeginMoveDrag()
+        public void BeginMoveDrag(PointerPressedEventArgs e)
         {
             _native.BeginMoveDrag();
         }
@@ -343,7 +343,7 @@ namespace Avalonia.Native
             _native.SetMinMaxSize(minSize.ToAvnSize(), maxSize.ToAvnSize());
         }
 
-        public void BeginResizeDrag(WindowEdge edge)
+        public void BeginResizeDrag(WindowEdge edge, PointerPressedEventArgs e)
         {
 
         }

src/Avalonia.X11/X11Window.cs

@@ -878,21 +878,23 @@ namespace Avalonia.X11
 
         }
 
-        void BeginMoveResize(NetWmMoveResize side)
+        void BeginMoveResize(NetWmMoveResize side, PointerPressedEventArgs e)
         {
             var pos = GetCursorPos(_x11);
             XUngrabPointer(_x11.Display, new IntPtr(0));
             SendNetWMMessage (_x11.Atoms._NET_WM_MOVERESIZE, (IntPtr) pos.x, (IntPtr) pos.y,
                 (IntPtr) side,
                 (IntPtr) 1, (IntPtr)1); // left button
+                
+            e.Pointer.Capture(null);
         }
 
-        public void BeginMoveDrag()
+        public void BeginMoveDrag(PointerPressedEventArgs e)
         {
-            BeginMoveResize(NetWmMoveResize._NET_WM_MOVERESIZE_MOVE);
+            BeginMoveResize(NetWmMoveResize._NET_WM_MOVERESIZE_MOVE, e);
         }
 
-        public void BeginResizeDrag(WindowEdge edge)
+        public void BeginResizeDrag(WindowEdge edge, PointerPressedEventArgs e)
         {
             var side = NetWmMoveResize._NET_WM_MOVERESIZE_CANCEL;
             if (edge == WindowEdge.East)
@@ -911,7 +913,7 @@ namespace Avalonia.X11
                 side = NetWmMoveResize._NET_WM_MOVERESIZE_SIZE_BOTTOMRIGHT;
             if (edge == WindowEdge.SouthWest)
                 side = NetWmMoveResize._NET_WM_MOVERESIZE_SIZE_BOTTOMLEFT;
-            BeginMoveResize(side);
+            BeginMoveResize(side, e);
         }
         
         public void SetTitle(string title)

src/Windows/Avalonia.Win32/WindowImpl.cs

@@ -331,7 +331,7 @@ namespace Avalonia.Win32
             ShowWindow(_showWindowState);
         }
 
-        public void BeginMoveDrag()
+        public void BeginMoveDrag(PointerPressedEventArgs e)
         {
             WindowsMouseDevice.Instance.Capture(null);
             UnmanagedMethods.DefWindowProc(_hwnd, (int)UnmanagedMethods.WindowsMessage.WM_NCLBUTTONDOWN,
@@ -350,7 +350,7 @@ namespace Avalonia.Win32
             {WindowEdge.West, UnmanagedMethods.HitTestValues.HTLEFT}
         };
 
-        public void BeginResizeDrag(WindowEdge edge)
+        public void BeginResizeDrag(WindowEdge edge, PointerPressedEventArgs e)
         {
 #if USE_MANAGED_DRAG
             _managedDrag.BeginResizeDrag(edge, ScreenToClient(MouseDevice.Position));