implement per window menus on osx side.

native/Avalonia.Native/src/OSX/Avalonia.Native.OSX.xcodeproj/project.pbxproj

@@ -8,6 +8,7 @@
 
 /* Begin PBXBuildFile section */
 		1A002B9E232135EE00021753 /* app.mm in Sources */ = {isa = PBXBuildFile; fileRef = 1A002B9D232135EE00021753 /* app.mm */; };
+		37155CE4233C00EB0034DCE9 /* menu.h in Headers */ = {isa = PBXBuildFile; fileRef = 37155CE3233C00EB0034DCE9 /* menu.h */; };
 		37A517B32159597E00FBA241 /* Screens.mm in Sources */ = {isa = PBXBuildFile; fileRef = 37A517B22159597E00FBA241 /* Screens.mm */; };
 		37C09D8821580FE4006A6758 /* SystemDialogs.mm in Sources */ = {isa = PBXBuildFile; fileRef = 37C09D8721580FE4006A6758 /* SystemDialogs.mm */; };
 		37DDA9B0219330F8002E132B /* AvnString.mm in Sources */ = {isa = PBXBuildFile; fileRef = 37DDA9AF219330F8002E132B /* AvnString.mm */; };
@@ -25,6 +26,7 @@
 
 /* Begin PBXFileReference section */
 		1A002B9D232135EE00021753 /* app.mm */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.objcpp; path = app.mm; sourceTree = "<group>"; };
+		37155CE3233C00EB0034DCE9 /* menu.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = menu.h; sourceTree = "<group>"; };
 		379860FE214DA0C000CD0246 /* KeyTransform.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = KeyTransform.h; sourceTree = "<group>"; };
 		37A4E71A2178846A00EACBCD /* headers */ = {isa = PBXFileReference; lastKnownFileType = folder; name = headers; path = ../../inc; sourceTree = "<group>"; };
 		37A517B22159597E00FBA241 /* Screens.mm */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.objcpp; path = Screens.mm; sourceTree = "<group>"; };
@@ -87,6 +89,7 @@
 				AB661C1F2148286E00291242 /* window.mm */,
 				37C09D8A21581EF2006A6758 /* window.h */,
 				AB00E4F62147CA920032A60A /* main.mm */,
+				37155CE3233C00EB0034DCE9 /* menu.h */,
 				520624B222973F4100C4DCEF /* menu.mm */,
 				37A517B22159597E00FBA241 /* Screens.mm */,
 				37C09D8721580FE4006A6758 /* SystemDialogs.mm */,
@@ -110,6 +113,7 @@
 			isa = PBXHeadersBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				37155CE4233C00EB0034DCE9 /* menu.h in Headers */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};

native/Avalonia.Native/src/OSX/menu.h

@@ -15,7 +15,7 @@ class AvnAppMenuItem;
 class AvnAppMenu;
 
 @interface AvnMenu : NSMenu // for some reason it doesnt detect nsmenu here but compiler doesnt complain
-
+- (void)setMenu:(NSMenu*) menu;
 @end
 
 @interface AvnMenuItem : NSMenuItem

native/Avalonia.Native/src/OSX/window.h

@@ -20,7 +20,7 @@ class WindowBaseImpl;
 -(void) pollModalSession: (NSModalSession _Nonnull) session;
 -(void) restoreParentWindow;
 -(bool) shouldTryToHandleEvents;
--(void) setMenu:(NSMenu *)menu;
+-(void) applyMenu:(NSMenu *)menu;
 @end
 
 struct INSWindowHolder

native/Avalonia.Native/src/OSX/window.mm

@@ -5,6 +5,7 @@
 #include "window.h"
 #include "KeyTransform.h"
 #include "cursor.h"
+#include "menu.h"
 #include <OpenGL/gl.h>
 
 class SoftwareDrawingOperation
@@ -215,12 +216,16 @@ public:
     {
         _mainMenu = menu;
         
+        auto nativeMenu = dynamic_cast<AvnAppMenu*>(menu);
         
+        auto nsmenu = nativeMenu->GetNative();
+        
+        [Window applyMenu:nsmenu];
         
         return S_OK;
     }
     
-    virtual HRESULT GetMainMenu(IAvnAppMenu** ret) override
+    virtual HRESULT ObtainMainMenu(IAvnAppMenu** ret) override
     {
         if(ret == nullptr)
         {
@@ -1089,7 +1094,7 @@ NSArray* AllLoopModes = [NSArray arrayWithObjects: NSDefaultRunLoopMode, NSEvent
     }
 }
 
--(void) setMenu:(NSMenu *)menu
+-(void) applyMenu:(NSMenu *)menu
 {
     _menu = menu;
     [NSApp setMenu:menu];