Merge pull request #3 from AvaloniaUI/features/begin-move-drag

implement begin move drag.

src/Avalonia.Native.OSX/window.mm

@@ -4,6 +4,7 @@ class WindowBaseImpl;
 
 @interface AvnView : NSView
 -(AvnView*)  initWithParent: (WindowBaseImpl*) parent;
+-(NSEvent*)  lastMouseDownEvent;
 @end
 
 @interface AvnWindow : NSWindow <NSWindowDelegate>
@@ -11,9 +12,6 @@ class WindowBaseImpl;
 -(void) setCanBecomeKeyAndMain;
 @end
 
-
-
-
 class WindowBaseImpl : public ComSingleObject<IAvnWindowBase, &IID_IAvnWindowBase>
 {
 public:
@@ -64,6 +62,18 @@ public:
         [View setNeedsDisplayInRect:[View frame]];
     }
     
+    virtual void BeginMoveDrag ()
+    {
+        auto lastEvent = [View lastMouseDownEvent];
+        
+        if(lastEvent == nullptr)
+        {
+            return;
+        }
+        
+        [Window performWindowDragWithEvent:lastEvent];
+    }
+    
 protected:
     virtual NSWindowStyleMask GetStyle()
     {
@@ -74,8 +84,6 @@ protected:
     {
         [Window setStyleMask:GetStyle()];
     }
-    
-    
 };
 
 @implementation AvnView
@@ -86,6 +94,11 @@ protected:
     NSEvent* _lastMouseDownEvent;
 }
 
+- (NSEvent*) lastMouseDownEvent
+{
+    return _lastMouseDownEvent;
+}
+
 -(AvnView*)  initWithParent: (WindowBaseImpl*) parent
 {
     self = [super init];

src/Avalonia.Native/WindowImplBase.cs

@@ -182,8 +182,6 @@ namespace Avalonia.Native
 
         Action<double> ITopLevelImpl.ScalingChanged { get; set; }
 
-
-
         public void SetTopmost(bool value)
         {
         }
@@ -197,13 +195,13 @@ namespace Avalonia.Native
         {
         }
 
-
-
         public void Hide()
         {
         }
+
         public void BeginMoveDrag()
         {
+            _native.BeginMoveDrag();
         }
 
         public void BeginResizeDrag(WindowEdge edge)

src/headers/avalonia-native.h

@@ -69,6 +69,7 @@ AVNCOM(IAvnWindowBase, 02) : virtual IUnknown
     virtual HRESULT GetClientSize(AvnSize*ret) = 0;
     virtual HRESULT Resize(double width, double height) = 0;
     virtual void Invalidate (AvnRect rect) = 0;
+    virtual void BeginMoveDrag () = 0;
 };
 
 AVNCOM(IAvnWindow, 03) : virtual IAvnWindowBase