Implement wxTopLevelWindow::EnableCloseButton() for wxOSX

Just forward this wx method to Cocoa standardWindowButton:NSWindowCloseButton.

See #17133

docs/changes.txt

@@ -173,6 +173,7 @@ wxOSX/Cocoa:
 
 - Use more efficient FSEvents (10.7+) in wxFileSystemWatcher (Roberto Perpuly).
 - Implement wxWindow::Disable() for non-native controls too (Steve Browne).
+- Implement wxTopLevelWindow::EnableCloseButton() (John Roberts).
 - Fix wxEVT_CHAR for non-BMP Unicode characters (ARATA Mizuki).
 - Add support for wxEVT_COMBOBOX_DROPDOWN and wxEVT_COMBOBOX_CLOSEUP
   events (Igor Korot).

include/wx/osx/cocoa/private.h

@@ -231,6 +231,8 @@ public :
 
     virtual void SetTitle( const wxString& title, wxFontEncoding encoding ) ;
 
+    virtual bool EnableCloseButton(bool enable) wxOVERRIDE;
+
     virtual bool IsMaximized() const;
 
     virtual bool IsIconized() const;

include/wx/osx/core/private.h

@@ -847,6 +847,8 @@ public :
 
     virtual void SetTitle( const wxString& title, wxFontEncoding encoding ) = 0;
 
+    virtual bool EnableCloseButton(bool enable) = 0;
+
     virtual bool IsMaximized() const = 0;
 
     virtual bool IsIconized() const= 0;

include/wx/osx/toplevel.h

@@ -74,6 +74,10 @@ public:
     virtual void SetTitle( const wxString& title);
     virtual wxString GetTitle() const;
 
+    // EnableCloseButton(false) used to disable the "Close"
+    // button on the title bar
+    virtual bool EnableCloseButton(bool enable = true) wxOVERRIDE;
+
     virtual void SetLabel(const wxString& label) { SetTitle( label ); }
     virtual wxString GetLabel() const            { return GetTitle(); }
     

interface/wx/toplevel.h

@@ -142,8 +142,6 @@ public:
         corner of a dialog) and the Close entry of the system menu (most often
         in the left upper corner of the dialog).
 
-        Currently only implemented for wxMSW and wxGTK.
-
         Returns @true if operation was successful. This may be wrong on X11
         (including GTK+) where the window manager may not support this operation
         and there is no way to find out.

src/osx/cocoa/nonownedwnd.mm

@@ -939,6 +939,13 @@ void wxNonOwnedWindowCocoaImpl::SetTitle( const wxString& title, wxFontEncoding
     [m_macWindow setTitle:wxCFStringRef( title , encoding ).AsNSString()];
 }
 
+bool wxNonOwnedWindowCocoaImpl::EnableCloseButton(bool enable)
+{
+    [[m_macWindow standardWindowButton:NSWindowCloseButton] setEnabled:enable];
+
+    return true;
+}
+
 bool wxNonOwnedWindowCocoaImpl::IsMaximized() const
 {
     if (([m_macWindow styleMask] & NSResizableWindowMask) != 0)

src/osx/toplevel_osx.cpp

@@ -205,6 +205,16 @@ bool wxTopLevelWindowMac::IsFullScreen() const
     return m_nowpeer->IsFullScreen();
 }
 
+bool wxTopLevelWindowMac::EnableCloseButton(bool enable)
+{
+    // Unlike in wxMSW, wxSYSTEM_MENU is not sufficient to show
+    // a close button unless combined with one of the resize buttons.
+    if ( HasFlag(wxCLOSE_BOX) )
+        return m_nowpeer->EnableCloseButton( enable);
+
+    return false;
+}
+
 void wxTopLevelWindowMac::RequestUserAttention(int flags)
 {
     return m_nowpeer->RequestUserAttention(flags);