Add wxFullScreenEvent for macOS

Send a wxFullScreenEvent when the user enters or exits full screen on
macOS. EnableFullScreenView() has to be used to enable the native
full screen API.

Closes https://github.com/wxWidgets/wxWidgets/pull/2284

include/wx/event.h

@@ -681,6 +681,7 @@ class WXDLLIMPEXP_FWD_CORE wxWindowDestroyEvent;
 class WXDLLIMPEXP_FWD_CORE wxShowEvent;
 class WXDLLIMPEXP_FWD_CORE wxIconizeEvent;
 class WXDLLIMPEXP_FWD_CORE wxMaximizeEvent;
+class WXDLLIMPEXP_FWD_CORE wxFullScreenEvent;
 class WXDLLIMPEXP_FWD_CORE wxMouseCaptureChangedEvent;
 class WXDLLIMPEXP_FWD_CORE wxMouseCaptureLostEvent;
 class WXDLLIMPEXP_FWD_CORE wxPaintEvent;
@@ -832,6 +833,7 @@ wxDECLARE_EXPORTED_EVENT(WXDLLIMPEXP_CORE, wxEVT_DESTROY, wxWindowDestroyEvent);
 wxDECLARE_EXPORTED_EVENT(WXDLLIMPEXP_CORE, wxEVT_SHOW, wxShowEvent);
 wxDECLARE_EXPORTED_EVENT(WXDLLIMPEXP_CORE, wxEVT_ICONIZE, wxIconizeEvent);
 wxDECLARE_EXPORTED_EVENT(WXDLLIMPEXP_CORE, wxEVT_MAXIMIZE, wxMaximizeEvent);
+wxDECLARE_EXPORTED_EVENT(WXDLLIMPEXP_CORE, wxEVT_FULLSCREEN, wxFullScreenEvent);
 wxDECLARE_EXPORTED_EVENT(WXDLLIMPEXP_CORE, wxEVT_MOUSE_CAPTURE_CHANGED, wxMouseCaptureChangedEvent);
 wxDECLARE_EXPORTED_EVENT(WXDLLIMPEXP_CORE, wxEVT_MOUSE_CAPTURE_LOST, wxMouseCaptureLostEvent);
 wxDECLARE_EXPORTED_EVENT(WXDLLIMPEXP_CORE, wxEVT_PAINT, wxPaintEvent);
@@ -2725,6 +2727,30 @@ private:
     wxDECLARE_DYNAMIC_CLASS_NO_ASSIGN(wxMaximizeEvent);
 };
 
+/*
+ wxEVT_FULLSCREEN
+ */
+class WXDLLIMPEXP_CORE wxFullScreenEvent : public wxEvent
+{
+public:
+    wxFullScreenEvent(int winid = 0, bool fullscreen = true)
+        : wxEvent(winid, wxEVT_FULLSCREEN)
+        { m_fullscreen = fullscreen; }
+    wxFullScreenEvent(const wxFullScreenEvent& event)
+        : wxEvent(event)
+        { m_fullscreen = event.m_fullscreen; }
+
+    bool IsFullScreen() const { return m_fullscreen; }
+
+    virtual wxEvent *Clone() const wxOVERRIDE { return new wxFullScreenEvent(*this); }
+
+protected:
+    bool m_fullscreen;
+
+private:
+    wxDECLARE_DYNAMIC_CLASS_NO_ASSIGN(wxFullScreenEvent);
+};
+
 // Joystick event class
 /*
  wxEVT_JOY_BUTTON_DOWN,

include/wx/osx/cocoa/private.h

@@ -341,6 +341,8 @@ public :
     CGWindowLevel   GetWindowLevel() const wxOVERRIDE { return m_macWindowLevel; }
     void            RestoreWindowLevel() wxOVERRIDE;
 
+    bool m_macIgnoreNextFullscreenChange = false;
+
     static WX_NSResponder GetNextFirstResponder() ;
     static WX_NSResponder GetFormerFirstResponder() ;
 protected :

interface/wx/event.h

@@ -2262,6 +2262,46 @@ public:
     wxMaximizeEvent(int id = 0);
 };
 
+/**
+    @class wxFullScreenEvent
+
+    An event being sent when the user enters or exits full screen mode.
+
+    Currently this event is only generated in the wxOSX/Cocoa port when
+    wxTopLevelWindow::EnableFullScreenView() is enabled and the user
+    the user enters or exits full screen. Note that this event is @e not
+    generated when wxTopLevelWindow::ShowFullScreen().
+
+    @beginEventTable{wxFullScreenEvent}
+    @event{EVT_FULLSCREEN(func)}
+        Process a @c wxEVT_FULLSCREEN event.
+    @endEventTable
+
+    @library{wxcore}
+    @category{events}
+
+    @since 3.1.5
+
+    @see @ref overview_events, wxTopLevelWindow::EnableFullScreenView,
+         wxTopLevelWindow::IsFullScreen
+*/
+class wxFullScreenEvent : public wxEvent
+{
+public:
+    /**
+        Constructor.
+    */
+    wxFullScreenEvent(int id = 0, bool fullscreen = true);
+
+    /**
+        Returns @true if the frame entered full screen, @false if exited
+        full screen.
+    */
+    bool IsFullScreen() const;
+};
+
+
+
 /**
     The possibles modes to pass to wxUpdateUIEvent::SetMode().
 */
@@ -5151,4 +5191,3 @@ wxEventType wxEVT_WINDOW_MODAL_DIALOG_CLOSED;
 #endif // wxUSE_GUI
 
 //@}
-

interface/wx/toplevel.h

@@ -68,6 +68,8 @@ enum
         See wxMoveEvent.
     @event{EVT_SHOW(func)}
         Process a @c wxEVT_SHOW event. See wxShowEvent.
+    @event{EVT_FULLSCREEN(id, func)}
+        Process a @c wxEVT_FULLSCREEN event. See wxFullScreenEvent.
     @endEventTable
 
     @library{wxcore}
@@ -632,17 +634,16 @@ public:
     virtual void ShowWithoutActivating();
 
     /**
-        Enables the maximize button to toggle full screen mode. Prior to
-        macOS 10.10 a full screen button is added to the right upper corner
-        of a window's title bar.
+        Enables the zoom button to toggle full screen mode.
 
-        Currently only available for wxOSX/Cocoa.
+        A wxFullScreenEvent is generated when the users enters or exits
+        full screen via the enter/exit full screen button.
 
         @param enable
-            If @true (default) adds the full screen button in the title bar;
-            if @false the button is removed.
+            If @true (default) make the zoom button toggle full screen;
+            if @false the button does only toggle zoom.
 
-        @return @true if the button was added or removed, @false if running
+        @return @true if the button behaviour has been changed, @false if running
         under another OS.
 
         @note Having the button is also required to let ShowFullScreen()
@@ -653,7 +654,7 @@ public:
 
         @onlyfor{wxosx}
 
-        @see ShowFullScreen()
+        @see ShowFullScreen(), wxFullScreenEvent
 
         @since 3.1.0
     */
@@ -718,4 +719,3 @@ public:
     */
     void UseNativeDecorationsByDefault(bool native = true);
 };
-

src/common/event.cpp

@@ -80,6 +80,7 @@
     wxIMPLEMENT_DYNAMIC_CLASS(wxShowEvent, wxEvent);
     wxIMPLEMENT_DYNAMIC_CLASS(wxMaximizeEvent, wxEvent);
     wxIMPLEMENT_DYNAMIC_CLASS(wxIconizeEvent, wxEvent);
+    wxIMPLEMENT_DYNAMIC_CLASS(wxFullScreenEvent, wxEvent);
     wxIMPLEMENT_DYNAMIC_CLASS(wxMenuEvent, wxEvent);
     wxIMPLEMENT_DYNAMIC_CLASS(wxJoystickEvent, wxEvent);
     wxIMPLEMENT_DYNAMIC_CLASS(wxDropFilesEvent, wxEvent);
@@ -288,6 +289,7 @@ wxDEFINE_EVENT( wxEVT_DESTROY, wxWindowDestroyEvent );
 wxDEFINE_EVENT( wxEVT_SHOW, wxShowEvent );
 wxDEFINE_EVENT( wxEVT_ICONIZE, wxIconizeEvent );
 wxDEFINE_EVENT( wxEVT_MAXIMIZE, wxMaximizeEvent );
+wxDEFINE_EVENT( wxEVT_FULLSCREEN, wxFullScreenEvent );
 wxDEFINE_EVENT( wxEVT_MOUSE_CAPTURE_CHANGED, wxMouseCaptureChangedEvent );
 wxDEFINE_EVENT( wxEVT_MOUSE_CAPTURE_LOST, wxMouseCaptureLostEvent );
 wxDEFINE_EVENT( wxEVT_PAINT, wxPaintEvent );

src/osx/cocoa/nonownedwnd.mm

@@ -606,6 +606,25 @@ extern int wxOSXGetIdFromSelector(SEL action );
     return true;
 }
 
+static void SendFullScreenWindowEvent(NSNotification* notification, bool fullscreen)
+{
+    NSWindow* window = (NSWindow*) [notification object];
+    wxNonOwnedWindowCocoaImpl* windowimpl = [window WX_implementation];
+    if ( windowimpl )
+    {
+        if (windowimpl->m_macIgnoreNextFullscreenChange)
+        {
+            windowimpl->m_macIgnoreNextFullscreenChange = false;
+            return;
+        }
+
+        wxNonOwnedWindow* wxpeer = windowimpl->GetWXPeer();
+        wxFullScreenEvent event(wxpeer->GetId(), fullscreen);
+        event.SetEventObject(wxpeer);
+        wxpeer->HandleWindowEvent(event);
+    }
+}
+
 // work around OS X bug, on a secondary monitor an already fully sized window
 // (eg maximized) will not be correctly put to full screen size and keeps a 22px
 // title band at the top free, therefore we force the correct content size
@@ -624,6 +643,13 @@ extern int wxOSXGetIdFromSelector(SEL action );
     {
         [view setFrameSize: expectedframerect.size];
     }
+
+    SendFullScreenWindowEvent(notification, true);
+}
+
+- (void)windowWillExitFullScreen:(NSNotification *)notification
+{
+    SendFullScreenWindowEvent(notification, false);
 }
 
 // from https://developer.apple.com/library/archive/documentation/GraphicsAnimation/Conceptual/HighResolutionOSX/CapturingScreenContents/CapturingScreenContents.html
@@ -1178,6 +1204,7 @@ bool wxNonOwnedWindowCocoaImpl::ShowFullScreen(bool show, long WXUNUSED(style))
     {
         if ( show != IsFullScreen() )
         {
+            m_macIgnoreNextFullscreenChange = true;
             [m_macWindow toggleFullScreen: nil];
         }