Add wxTopLevelWindow::Enable{Maximize,Minimize}Button()

Allow to disable maximize and minimize buttons dynamically just as we already
allow to disable the "Close" button using EnableCloseButton().

Currently implemented for MSW and OSX only.

Closes #17133.

docs/changes.txt

@@ -85,6 +85,7 @@ All (GUI):
 - Add wxAppProgressIndicator for MSW (Chaobin Zhang) and OS X (Tobias Taschner).
 - Add wxEVT_MAGNIFY mouse event (Joost Nieuwenhuijse).
 - Add wxProcess::Activate().
+- Add wxTopLevelWindow::Enable{Maximize,Minimize}Button() (John Roberts).
 - Make results of wxDC::DrawEllipticArc() consistent across all platforms.
 - XRC handler for wxAuiToolBar added (Kinaou Hervé, David Hart).
 - Improve wxLIST_AUTOSIZE_XXX support in generic wxListCtrl (Kinaou Hervé).

include/wx/msw/toplevel.h

@@ -68,6 +68,8 @@ public:
     // wxMSW only: EnableCloseButton(false) may be used to remove the "Close"
     // button from the title bar
     virtual bool EnableCloseButton(bool enable = true);
+    virtual bool EnableMaximizeButton(bool enable = true) wxOVERRIDE;
+    virtual bool EnableMinimizeButton(bool enable = true) wxOVERRIDE;
 
     // Set window transparency if the platform supports it
     virtual bool SetTransparent(wxByte alpha);

include/wx/osx/cocoa/private.h

@@ -232,6 +232,8 @@ public :
     virtual void SetTitle( const wxString& title, wxFontEncoding encoding ) ;
 
     virtual bool EnableCloseButton(bool enable) wxOVERRIDE;
+    virtual bool EnableMaximizeButton(bool enable) wxOVERRIDE;
+    virtual bool EnableMinimizeButton(bool enable) wxOVERRIDE;
 
     virtual bool IsMaximized() const;
 

include/wx/osx/core/private.h

@@ -848,6 +848,8 @@ public :
     virtual void SetTitle( const wxString& title, wxFontEncoding encoding ) = 0;
 
     virtual bool EnableCloseButton(bool enable) = 0;
+    virtual bool EnableMaximizeButton(bool enable) = 0;
+    virtual bool EnableMinimizeButton(bool enable) = 0;
 
     virtual bool IsMaximized() const = 0;
 

include/wx/osx/toplevel.h

@@ -77,6 +77,8 @@ public:
     // EnableCloseButton(false) used to disable the "Close"
     // button on the title bar
     virtual bool EnableCloseButton(bool enable = true) wxOVERRIDE;
+    virtual bool EnableMaximizeButton(bool enable = true) wxOVERRIDE;
+    virtual bool EnableMinimizeButton(bool enable = true) wxOVERRIDE;
 
     virtual void SetLabel(const wxString& label) { SetTitle( label ); }
     virtual wxString GetLabel() const            { return GetTitle(); }

include/wx/toplevel.h

@@ -206,6 +206,8 @@ public:
 
     // enable/disable close button [x]
     virtual bool EnableCloseButton(bool WXUNUSED(enable) = true) { return false; }
+    virtual bool EnableMaximizeButton(bool WXUNUSED(enable) = true) { return false; }
+    virtual bool EnableMinimizeButton(bool WXUNUSED(enable) = true) { return false; }
 
     // Attracts the users attention to this window if the application is
     // inactive (should be called when a background event occurs)

interface/wx/toplevel.h

@@ -148,6 +148,39 @@ public:
     */
     virtual bool EnableCloseButton(bool enable = true);
 
+    /**
+        Enables or disables the Maximize button (in the right or left upper
+        corner of a frame or dialog).
+
+        Currently only implemented for wxMSW and wxOSX.
+
+        The window style must contain wxMAXIMIZE_BOX.
+
+        Returns @true if operation was successful. Note that a successful
+        operation does not change the window style flags.
+
+        @since 3.1.0
+    */
+    virtual bool EnableMaximizeButton(bool enable = true);
+
+    /**
+        Enables or disables the Minimize button (in the right or left upper
+        corner of a frame or dialog).
+
+        Currently only implemented for wxMSW and wxOSX.
+
+        The window style must contain wxMINIMIZE_BOX.
+
+        Note that in wxMSW a successful operation will change the window
+        style flags.
+
+        Returns @true if operation was successful. Note that a successful
+        operation does not change the window style flags.
+
+        @since 3.1.0
+    */
+    virtual bool EnableMinimizeButton(bool enable = true);
+
     /**
         Returns a pointer to the button which is the default for this window, or
         @c @NULL. The default button is the one activated by pressing the Enter

src/msw/toplevel.cpp

@@ -1194,6 +1194,56 @@ bool wxTopLevelWindowMSW::EnableCloseButton(bool enable)
     return true;
 }
 
+// Window must have wxCAPTION and either wxCLOSE_BOX or wxSYSTEM_MENU for the
+// button to be visible. Also check for wxMAXIMIZE_BOX because we don't want
+// to enable a button that is excluded from the current style.
+
+bool wxTopLevelWindowMSW::EnableMaximizeButton(bool enable)
+{
+    if ( ( HasFlag(wxCAPTION) &&
+         ( HasFlag(wxCLOSE_BOX) || HasFlag(wxSYSTEM_MENU) ) ) &&
+         HasFlag(wxMAXIMIZE_BOX) )
+    {
+        if ( enable )
+        {
+            SetWindowStyleFlag(GetWindowStyleFlag() | wxMAXIMIZE_BOX);
+        }
+        else
+        {
+            SetWindowStyleFlag(GetWindowStyleFlag() ^ wxMAXIMIZE_BOX);
+            // Restore the style to our internal store
+            wxWindowBase::SetWindowStyleFlag(GetWindowStyle() | wxMAXIMIZE_BOX);
+        }
+
+        return true;
+    }
+
+    return false;
+}
+
+bool wxTopLevelWindowMSW::EnableMinimizeButton(bool enable)
+{
+    if ( ( HasFlag(wxCAPTION) &&
+         ( HasFlag(wxCLOSE_BOX) || HasFlag(wxSYSTEM_MENU) ) ) &&
+         HasFlag(wxMINIMIZE_BOX) )
+    {
+        if ( enable )
+        {
+            SetWindowStyleFlag(GetWindowStyleFlag() | wxMINIMIZE_BOX);
+        }
+        else
+        {
+            SetWindowStyleFlag(GetWindowStyleFlag() ^ wxMINIMIZE_BOX);
+            // Restore the style to our internal store
+            wxWindowBase::SetWindowStyleFlag(GetWindowStyle() | wxMINIMIZE_BOX);
+        }
+
+        return true;
+    }
+
+    return false;
+}
+
 void wxTopLevelWindowMSW::RequestUserAttention(int flags)
 {
 #if defined(FLASHW_STOP) && wxUSE_DYNLIB_CLASS

src/osx/cocoa/nonownedwnd.mm

@@ -946,6 +946,20 @@ bool wxNonOwnedWindowCocoaImpl::EnableCloseButton(bool enable)
     return true;
 }
 
+bool wxNonOwnedWindowCocoaImpl::EnableMaximizeButton(bool enable)
+{
+    [[m_macWindow standardWindowButton:NSWindowZoomButton] setEnabled:enable];
+
+    return true;
+}
+
+bool wxNonOwnedWindowCocoaImpl::EnableMinimizeButton(bool enable)
+{
+    [[m_macWindow standardWindowButton:NSWindowMiniaturizeButton] setEnabled:enable];
+
+    return true;
+}
+
 bool wxNonOwnedWindowCocoaImpl::IsMaximized() const
 {
     if (([m_macWindow styleMask] & NSResizableWindowMask) != 0)

src/osx/toplevel_osx.cpp

@@ -215,6 +215,23 @@ bool wxTopLevelWindowMac::EnableCloseButton(bool enable)
     return false;
 }
 
+bool wxTopLevelWindowMac::EnableMaximizeButton(bool enable)
+{
+    // Both wxRESIZE_BORDER and wxMAXIMIZE_BOX create a resize border and
+    // add a maximize button.
+    if ( HasFlag(wxMAXIMIZE_BOX) || HasFlag(wxRESIZE_BORDER) )
+        return m_nowpeer->EnableMaximizeButton( enable);
+    return false;
+}
+
+bool wxTopLevelWindowMac::EnableMinimizeButton(bool enable)
+{
+    if ( HasFlag(wxMINIMIZE_BOX) )
+        return m_nowpeer->EnableMinimizeButton( enable);
+
+    return false;
+}
+
 void wxTopLevelWindowMac::RequestUserAttention(int flags)
 {
     return m_nowpeer->RequestUserAttention(flags);