[OSX] Parent-modal dialogs

native/Avalonia.Native/inc/avalonia-native.h

@@ -207,7 +207,7 @@ AVNCOM(IAvnPopup, 03) : virtual IAvnWindowBase
 
 AVNCOM(IAvnWindow, 04) : virtual IAvnWindowBase
 {
-    virtual HRESULT ShowDialog (IUnknown**ppv) = 0;
+    virtual HRESULT ShowDialog (IAvnWindow* parent) = 0;
     virtual HRESULT SetCanResize(bool value) = 0;
     virtual HRESULT SetHasDecorations(bool value) = 0;
     virtual HRESULT SetTitle (const char* title) = 0;

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

@@ -31,4 +31,13 @@ extern NSSize ToNSSize (AvnSize s);
 #define NSDebugLog(...) (void)0
 #endif
 
+template<typename T> inline T* objc_cast(id from) {
+    if(from == nil)
+        return nil;
+    if ([from isKindOfClass:[T class]]) {
+        return static_cast<T*>(from);
+    }
+    return nil;
+}
+
 #endif

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

@@ -18,6 +18,8 @@ class WindowBaseImpl;
 -(AvnWindow* _Nonnull) initWithParent: (WindowBaseImpl* _Nonnull) parent;
 -(void) setCanBecomeKeyAndMain;
 -(void) pollModalSession: (NSModalSession _Nonnull) session;
+-(void) restoreParentWindow;
+-(bool) shouldTryToHandleEvents;
 @end
 
 struct INSWindowHolder

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

@@ -109,6 +109,7 @@ public:
             if(Window != nullptr)
             {
                 [Window orderOut:Window];
+                [Window restoreParentWindow];
             }
             
             return S_OK;
@@ -392,30 +393,6 @@ protected:
     }
 };
 
-class ModalDisposable : public ComUnknownObject
-{
-    NSModalSession _session;
-    AvnWindow* _window;
-    
-    void Dispose ()
-    {
-        [_window orderOut:_window];
-        [NSApp endModalSession:_session];
-    }
-    
-public:
-    ModalDisposable(AvnWindow* window, NSModalSession session)
-    {
-        _session = session;
-        _window = window;
-    }
-    
-    virtual ~ModalDisposable()
-    {
-        Dispose();
-    }
-};
-
 class WindowImpl : public virtual WindowBaseImpl, public virtual IAvnWindow, public IWindowStateChanged
 {
 private:
@@ -444,32 +421,27 @@ private:
     {
         @autoreleasepool
         {
+            if([Window parentWindow] != nil)
+                [[Window parentWindow] removeChildWindow:Window];
             WindowBaseImpl::Show();
             
             return SetWindowState(_lastWindowState);
         }
     }
     
-    virtual HRESULT ShowDialog (IUnknown**ppv) override
+    virtual HRESULT ShowDialog (IAvnWindow* parent) override
     {
         @autoreleasepool
         {
-            if(ppv == nullptr)
-            {
+            if(parent == nullptr)
                 return E_POINTER;
-            }
-            
-            auto session = [NSApp beginModalSessionForWindow:Window];
-            auto disposable = new ModalDisposable(Window, session);
-            *ppv = disposable;
-            
-            SetPosition(lastPositionSet);
-            UpdateStyle();
-            
-            [Window setTitle:_lastTitle];
-            [Window setTitleVisibility:NSWindowTitleVisible];
+
+            auto cparent = dynamic_cast<WindowImpl*>(parent);
+            if(cparent == nullptr)
+                return E_INVALIDARG;
             
-            [Window pollModalSession:session];
+            [cparent->Window addChildWindow:Window ordered:NSWindowAbove];
+            WindowBaseImpl::Show();
             
             return S_OK;
         }
@@ -843,8 +815,19 @@ NSArray* AllLoopModes = [NSArray arrayWithObjects: NSDefaultRunLoopMode, NSEvent
     [super viewDidChangeBackingProperties];
 }
 
+- (bool) ignoreUserInput
+{
+    auto parentWindow = objc_cast<AvnWindow>([self window]);
+    if(parentWindow == nil || ![parentWindow shouldTryToHandleEvents])
+        return TRUE;
+    return FALSE;
+}
+
 - (void)mouseEvent:(NSEvent *)event withType:(AvnRawMouseEventType) type
 {
+    if([self ignoreUserInput])
+        return;
+    
     [self becomeFirstResponder];
     auto localPoint = [self convertPoint:[event locationInWindow] toView:self];
     auto avnPoint = [self toAvnPoint:localPoint];
@@ -952,7 +935,9 @@ NSArray* AllLoopModes = [NSArray arrayWithObjects: NSDefaultRunLoopMode, NSEvent
 } 
 
 - (void) keyboardEvent: (NSEvent *) event withType: (AvnRawKeyEventType)type
-{ 
+{
+    if([self ignoreUserInput])
+        return;
     auto key = s_KeyMap[[event keyCode]];
     
     auto timestamp = [event timestamp] * 1000;
@@ -1121,13 +1106,13 @@ NSArray* AllLoopModes = [NSArray arrayWithObjects: NSDefaultRunLoopMode, NSEvent
     {
         ComPtr<WindowBaseImpl> parent = _parent;
         _parent = NULL;
+        [self restoreParentWindow];
         parent->BaseEvents->Closed();
         [parent->View onClosed];
         [self setContentView: nil];
     }
 }
 
-
 -(BOOL)canBecomeKeyWindow
 {
     return _canBecomeKeyAndMain;
@@ -1138,12 +1123,62 @@ NSArray* AllLoopModes = [NSArray arrayWithObjects: NSDefaultRunLoopMode, NSEvent
     return _canBecomeKeyAndMain;
 }
 
+-(bool) activateAppropriateChild: (bool)activating
+{
+    for(NSWindow* uch in [self childWindows])
+    {
+        auto ch = objc_cast<AvnWindow>(uch);
+        if(ch == nil)
+            continue;
+        [ch activateAppropriateChild:false];
+        return FALSE;
+    }
+    
+    if(!activating)
+        [self makeKeyAndOrderFront:self];
+    return TRUE;
+}
+
+-(bool)shouldTryToHandleEvents
+{
+    for(NSWindow* uch in [self childWindows])
+    {
+        auto ch = objc_cast<AvnWindow>(uch);
+        if(ch == nil)
+            continue;
+        return FALSE;
+    }
+    return TRUE;
+}
+
+-(void)makeKeyWindow
+{
+    if([self activateAppropriateChild: true])
+    {
+        [super makeKeyWindow];
+    }
+}
+
 -(void)becomeKeyWindow
 {
-    _parent->BaseEvents->Activated();
-    [super becomeKeyWindow];
+    if([self activateAppropriateChild: true])
+    {
+        _parent->BaseEvents->Activated();
+        [super becomeKeyWindow];
+    }
 }
 
+-(void) restoreParentWindow;
+{
+    auto parent = objc_cast<AvnWindow>([self parentWindow]);
+    if(parent != nil)
+    {
+        [parent removeChildWindow:self];
+        [parent activateAppropriateChild: false];
+    }
+}
+
+
 - (BOOL)windowShouldZoom:(NSWindow *)window toFrame:(NSRect)newFrame
 {
     return true;

samples/ControlCatalog/Pages/DialogsPage.xaml

@@ -4,5 +4,6 @@
       <Button Name="SaveFile">Save File</Button>
       <Button Name="SelectFolder">Select Folder</Button>
       <Button Name="DecoratedWindow">Decorated window</Button>
+      <Button Name="Dialog">Dialog</Button>
   </StackPanel>
 </UserControl>

samples/ControlCatalog/Pages/DialogsPage.xaml.cs

@@ -34,6 +34,12 @@ namespace ControlCatalog.Pages
                 {
                     new DecoratedWindow().ShowDialog(GetWindow());
                 };
+            this.FindControl<Button>("Dialog").Click += delegate
+                {
+                    new MainWindow().ShowDialog(GetWindow());
+                };
+
+
         }
 
         Window GetWindow() => (Window)this.VisualRoot;

src/Avalonia.Native/WindowImpl.cs

@@ -48,7 +48,7 @@ namespace Avalonia.Native
 
         public void ShowDialog(IWindowImpl window)
         {
-            _native.ShowDialog();
+            _native.ShowDialog(((WindowImpl)window).Native);
         }
 
         public void CanResize(bool value)