Add wxBitmap::GetNSImage() which creates an autoreleased NSImage either

[wxWidgets.git] / include / wx / window.h

diff --git a/include/wx/window.h b/include/wx/window.h
index 6b45c4a7b49cecc4f493187ad72e4ea17fc30611..fae09c7ec06746a4b84543ea60d1e347f8e42fdc 100644 (file)
--- a/include/wx/window.h
+++ b/include/wx/window.h
@@ -12,7 +12,7 @@
 #ifndef _WX_WINDOW_H_BASE_
 #define _WX_WINDOW_H_BASE_
 
 #ifndef _WX_WINDOW_H_BASE_
 #define _WX_WINDOW_H_BASE_
 

-#if defined(__GNUG__) && !defined(__APPLE__)
+#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)

     #pragma interface "windowbase.h"
 #endif
 
     #pragma interface "windowbase.h"
 #endif
 


@@ -102,8 +102,9 @@ public:
     // creating the window
     // -------------------
 
     // creating the window
     // -------------------
 

-        // default ctor
-    wxWindowBase() { InitBase(); }
+        // default ctor, initializes everything which can be initialized before
+        // Create()
+    wxWindowBase();

 
         // pseudo ctor (can't be virtual, called from ctor)
     bool CreateBase(wxWindowBase *parent,
 
         // pseudo ctor (can't be virtual, called from ctor)
     bool CreateBase(wxWindowBase *parent,


@@ -119,17 +120,17 @@ public:
     // deleting the window
     // -------------------
 
     // deleting the window
     // -------------------
 

-        // ask the window to close itself, return TRUE if the event handler
+        // ask the window to close itself, return true if the event handler

         // honoured our request
         // honoured our request

-    bool Close( bool force = FALSE );
+    bool Close( bool force = false );

 
         // the following functions delete the C++ objects (the window itself
         // or its children) as well as the GUI windows and normally should
         // never be used directly
 
 
         // the following functions delete the C++ objects (the window itself
         // or its children) as well as the GUI windows and normally should
         // never be used directly
 

-        // delete window unconditionally (dangerous!), returns TRUE if ok
+        // delete window unconditionally (dangerous!), returns true if ok

     virtual bool Destroy();
     virtual bool Destroy();

-        // delete all children of this window, returns TRUE if ok
+        // delete all children of this window, returns true if ok

     bool DestroyChildren();
 
         // is the window being deleted?
     bool DestroyChildren();
 
         // is the window being deleted?


@@ -219,6 +220,8 @@ public:
         return wxPoint(w, h);
     }
 
         return wxPoint(w, h);
     }
 

+    void SetPosition( const wxPoint& pt ) { Move( pt ) ; }
+

     void GetSize( int *w, int *h ) const { DoGetSize(w, h); }
     wxSize GetSize() const
     {
     void GetSize( int *w, int *h ) const { DoGetSize(w, h); }
     wxSize GetSize() const
     {


@@ -356,14 +359,14 @@ public:
     // window state
     // ------------
 
     // window state
     // ------------
 

-        // returns TRUE if window was shown/hidden, FALSE if the nothing was
+        // returns true if window was shown/hidden, false if the nothing was

         // done (window was already shown/hidden)
         // done (window was already shown/hidden)

-    virtual bool Show( bool show = TRUE );
-    bool Hide() { return Show(FALSE); }
+    virtual bool Show( bool show = true );
+    bool Hide() { return Show(false); }

 
 

-        // returns TRUE if window was enabled/disabled, FALSE if nothing done
-    virtual bool Enable( bool enable = TRUE );
-    bool Disable() { return Enable(FALSE); }
+        // returns true if window was enabled/disabled, false if nothing done
+    virtual bool Enable( bool enable = true );
+    bool Disable() { return Enable(false); }

 
     bool IsShown() const { return m_isShown; }
     bool IsEnabled() const { return m_isEnabled; }
 
     bool IsShown() const { return m_isShown; }
     bool IsEnabled() const { return m_isEnabled; }


@@ -386,11 +389,16 @@ public:
     long GetExtraStyle() const { return m_exStyle; }
 
         // make the window modal (all other windows unresponsive)
     long GetExtraStyle() const { return m_exStyle; }
 
         // make the window modal (all other windows unresponsive)

-    virtual void MakeModal(bool modal = TRUE);
+    virtual void MakeModal(bool modal = true);

 
     virtual void SetThemeEnabled(bool enableTheme) { m_themeEnabled = enableTheme; }
     virtual bool GetThemeEnabled() const { return m_themeEnabled; }
 
 
     virtual void SetThemeEnabled(bool enableTheme) { m_themeEnabled = enableTheme; }
     virtual bool GetThemeEnabled() const { return m_themeEnabled; }
 

+        // returns true if this window should inherit its parent colours on
+        // creation
+    virtual bool ShouldInheritColours() const { return false; }
+
+

     // focus and keyboard handling
     // ---------------------------
 
     // focus and keyboard handling
     // ---------------------------
 


@@ -432,6 +440,9 @@ public:
     const wxWindowList& GetChildren() const { return m_children; }
     wxWindowList& GetChildren() { return m_children; }
 
     const wxWindowList& GetChildren() const { return m_children; }
     wxWindowList& GetChildren() { return m_children; }
 

+    // needed just for extended runtime
+    const wxWindowList& GetWindowChildren() const { return GetChildren() ; }
+

         // get the parent or the parent of the parent
     wxWindow *GetParent() const { return m_parent; }
     inline wxWindow *GetGrandParent() const;
         // get the parent or the parent of the parent
     wxWindow *GetParent() const { return m_parent; }
     inline wxWindow *GetGrandParent() const;


@@ -441,8 +452,8 @@ public:
 
         // it doesn't really change parent, use ReParent() instead
     void SetParent( wxWindowBase *parent ) { m_parent = (wxWindow *)parent; }
 
         // it doesn't really change parent, use ReParent() instead
     void SetParent( wxWindowBase *parent ) { m_parent = (wxWindow *)parent; }

-        // change the real parent of this window, return TRUE if the parent
-        // was changed, FALSE otherwise (error or newParent == oldParent)
+        // change the real parent of this window, return true if the parent
+        // was changed, false otherwise (error or newParent == oldParent)

     virtual bool Reparent( wxWindowBase *newParent );
 
         // implementation mostly
     virtual bool Reparent( wxWindowBase *newParent );
 
         // implementation mostly


@@ -477,11 +488,11 @@ public:
         // push/pop event handler: allows to chain a custom event handler to
         // alreasy existing ones
     void PushEventHandler( wxEvtHandler *handler );
         // push/pop event handler: allows to chain a custom event handler to
         // alreasy existing ones
     void PushEventHandler( wxEvtHandler *handler );

-    wxEvtHandler *PopEventHandler( bool deleteHandler = FALSE );
+    wxEvtHandler *PopEventHandler( bool deleteHandler = false );

 
         // find the given handler in the event handler chain and remove (but
 
         // find the given handler in the event handler chain and remove (but

-        // not delete) it from the event handler chain, return TRUE if it was
-        // found and FALSE otherwise (this also results in an assert failure so
+        // not delete) it from the event handler chain, return true if it was
+        // found and false otherwise (this also results in an assert failure so

         // this function should only be called when the handler is supposed to
         // be there)
     bool RemoveEventHandler(wxEvtHandler *handler);
         // this function should only be called when the handler is supposed to
         // be there)
     bool RemoveEventHandler(wxEvtHandler *handler);


@@ -500,7 +511,7 @@ public:
     // dialog oriented functions
     // -------------------------
 
     // dialog oriented functions
     // -------------------------
 

-        // validate the correctness of input, return TRUE if ok
+        // validate the correctness of input, return true if ok

     virtual bool Validate();
 
         // transfer data between internal and GUI representations
     virtual bool Validate();
 
         // transfer data between internal and GUI representations


@@ -516,8 +527,18 @@ public:
         { m_acceleratorTable = accel; }
     wxAcceleratorTable *GetAcceleratorTable()
         { return &m_acceleratorTable; }
         { m_acceleratorTable = accel; }
     wxAcceleratorTable *GetAcceleratorTable()
         { return &m_acceleratorTable; }

+

 #endif // wxUSE_ACCEL
 
 #endif // wxUSE_ACCEL
 

+#if wxUSE_HOTKEY
+    // hot keys (system wide accelerators)
+    // -----------------------------------
+
+    virtual bool RegisterHotKey(int hotkeyId, int modifiers, int keycode);
+    virtual bool UnregisterHotKey(int hotkeyId);
+#endif // wxUSE_HOTKEY
+
+

     // dialog units translations
     // -------------------------
 
     // dialog units translations
     // -------------------------
 


@@ -562,17 +583,17 @@ public:
 
         // mark the specified rectangle (or the whole window) as "dirty" so it
         // will be repainted
 
         // mark the specified rectangle (or the whole window) as "dirty" so it
         // will be repainted

-    virtual void Refresh( bool eraseBackground = TRUE,
+    virtual void Refresh( bool eraseBackground = true,

                           const wxRect *rect = (const wxRect *) NULL ) = 0;
 
         // a less awkward wrapper for Refresh
                           const wxRect *rect = (const wxRect *) NULL ) = 0;
 
         // a less awkward wrapper for Refresh

-    void RefreshRect(const wxRect& rect) { Refresh(TRUE, &rect); }
+    void RefreshRect(const wxRect& rect) { Refresh(true, &rect); }

 
         // repaint all invalid areas of the window immediately
     virtual void Update() { }
 
 
         // repaint all invalid areas of the window immediately
     virtual void Update() { }
 

-        // clear the window entirely
-    virtual void Clear() = 0;
+        // clear the window background
+    virtual void ClearBackground();

 
         // freeze the window: don't redraw it until it is thawed
     virtual void Freeze() { }
 
         // freeze the window: don't redraw it until it is thawed
     virtual void Freeze() { }


@@ -605,20 +626,20 @@ public:
     // --------------------------
 
         // set/retrieve the window colours (system defaults are used by
     // --------------------------
 
         // set/retrieve the window colours (system defaults are used by

-        // default): Set functions return TRUE if colour was changed
+        // default): Set functions return true if colour was changed

     virtual bool SetBackgroundColour( const wxColour &colour );
     virtual bool SetForegroundColour( const wxColour &colour );
 
     wxColour GetBackgroundColour() const { return m_backgroundColour; }
     wxColour GetForegroundColour() const { return m_foregroundColour; }
 
     virtual bool SetBackgroundColour( const wxColour &colour );
     virtual bool SetForegroundColour( const wxColour &colour );
 
     wxColour GetBackgroundColour() const { return m_backgroundColour; }
     wxColour GetForegroundColour() const { return m_foregroundColour; }
 

-        // set/retrieve the cursor for this window (SetCursor() returns TRUE
+        // set/retrieve the cursor for this window (SetCursor() returns true

         // if the cursor was really changed)
     virtual bool SetCursor( const wxCursor &cursor );
     const wxCursor& GetCursor() const { return m_cursor; }
     wxCursor& GetCursor() { return m_cursor; }
 
         // if the cursor was really changed)
     virtual bool SetCursor( const wxCursor &cursor );
     const wxCursor& GetCursor() const { return m_cursor; }
     wxCursor& GetCursor() { return m_cursor; }
 

-        // set/retrieve the font for the window (SetFont() returns TRUE if the
+        // set/retrieve the font for the window (SetFont() returns true if the

         // font really changed)
     virtual bool SetFont( const wxFont &font ) = 0;
     const wxFont& GetFont() const { return m_font; }
         // font really changed)
     virtual bool SetFont( const wxFont &font ) = 0;
     const wxFont& GetFont() const { return m_font; }


@@ -680,11 +701,19 @@ public:
     // misc
     // ----
 
     // misc
     // ----
 

-    // get the window border style: uses the current style and falls back to
-    // the default style for this class otherwise (see GetDefaultBorder())
-    wxBorder GetBorder() const;
+    // get the window border style from the given flags: this is different from
+    // simply doing flags & wxBORDER_MASK because it uses GetDefaultBorder() to
+    // translate wxBORDER_DEFAULT to something reasonable
+    wxBorder GetBorder(long flags) const;
+
+    // get border for the flags of this window
+    wxBorder GetBorder() const { return GetBorder(GetWindowStyleFlag()); }
+
+    // send wxUpdateUIEvents to this window, and children if recurse is true
+    virtual void UpdateWindowUI(long flags = wxUPDATE_UI_NONE);

 
 

-    void UpdateWindowUI();
+    // do the window-specific processing after processing the update event
+    virtual void DoUpdateWindowUI(wxUpdateUIEvent& event) ;

 
 #if wxUSE_MENUS
     bool PopupMenu( wxMenu *menu, const wxPoint& pos )
 
 #if wxUSE_MENUS
     bool PopupMenu( wxMenu *menu, const wxPoint& pos )


@@ -708,8 +737,8 @@ public:
                                int pos,
                                int thumbvisible,
                                int range,
                                int pos,
                                int thumbvisible,
                                int range,

-                               bool refresh = TRUE ) = 0;
-    virtual void SetScrollPos( int orient, int pos, bool refresh = TRUE ) = 0;
+                               bool refresh = true ) = 0;
+    virtual void SetScrollPos( int orient, int pos, bool refresh = true ) = 0;

     virtual int GetScrollPos( int orient ) const = 0;
     virtual int GetScrollThumb( int orient ) const = 0;
     virtual int GetScrollRange( int orient ) const = 0;
     virtual int GetScrollPos( int orient ) const = 0;
     virtual int GetScrollThumb( int orient ) const = 0;
     virtual int GetScrollRange( int orient ) const = 0;


@@ -720,9 +749,9 @@ public:
 
         // scrolls window by line/page: note that not all controls support this
         //
 
         // scrolls window by line/page: note that not all controls support this
         //

-        // return TRUE if the position changed, FALSE otherwise
-    virtual bool ScrollLines(int WXUNUSED(lines)) { return FALSE; }
-    virtual bool ScrollPages(int WXUNUSED(pages)) { return FALSE; }
+        // return true if the position changed, false otherwise
+    virtual bool ScrollLines(int WXUNUSED(lines)) { return false; }
+    virtual bool ScrollPages(int WXUNUSED(pages)) { return false; }

 
         // convenient wrappers for ScrollLines/Pages
     bool LineUp() { return ScrollLines(-1); }
 
         // convenient wrappers for ScrollLines/Pages
     bool LineUp() { return ScrollLines(-1); }


@@ -755,6 +784,7 @@ public:
     void SetToolTip( wxToolTip *tip ) { DoSetToolTip(tip); }
         // get the associated tooltip or NULL if none
     wxToolTip* GetToolTip() const { return m_tooltip; }
     void SetToolTip( wxToolTip *tip ) { DoSetToolTip(tip); }
         // get the associated tooltip or NULL if none
     wxToolTip* GetToolTip() const { return m_tooltip; }

+    wxString GetToolTipText() const ;

 #endif // wxUSE_TOOLTIPS
 
     // drag and drop
 #endif // wxUSE_TOOLTIPS
 
     // drag and drop


@@ -783,7 +813,7 @@ public:
     void ResetConstraints();
 
         // these methods may be overriden for special layout algorithms
     void ResetConstraints();
 
         // these methods may be overriden for special layout algorithms

-    virtual void SetConstraintSizes(bool recurse = TRUE);
+    virtual void SetConstraintSizes(bool recurse = true);

     virtual bool LayoutPhase1(int *noChanges);
     virtual bool LayoutPhase2(int *noChanges);
     virtual bool DoPhase(int phase);
     virtual bool LayoutPhase1(int *noChanges);
     virtual bool LayoutPhase2(int *noChanges);
     virtual bool DoPhase(int phase);


@@ -807,13 +837,23 @@ public:
     virtual bool Layout();
 
         // sizers
     virtual bool Layout();
 
         // sizers

-    void SetSizer(wxSizer *sizer, bool deleteOld = TRUE );
-    void SetSizerAndFit( wxSizer *sizer, bool deleteOld = TRUE );
+    void SetSizer(wxSizer *sizer, bool deleteOld = true );
+    void SetSizerAndFit( wxSizer *sizer, bool deleteOld = true );

 
     wxSizer *GetSizer() const { return m_windowSizer; }
 
     // Track if this window is a member of a sizer
 
     wxSizer *GetSizer() const { return m_windowSizer; }
 
     // Track if this window is a member of a sizer

-    void SetContainingSizer(wxSizer* sizer) { m_containingSizer = sizer; }
+    void SetContainingSizer(wxSizer* sizer)
+    {
+        // adding a window to a sizer twice is going to result in fatal and
+        // hard to debug problems later because when deleting the second
+        // associated wxSizerItem we're going to dereference a dangling
+        // pointer; so try to detect this as early as possible
+        wxASSERT_MSG( !sizer || m_containingSizer != sizer,
+                        _T("Adding a window to the same sizer twice?") );
+
+        m_containingSizer = sizer;
+    }

     wxSizer *GetContainingSizer() const { return m_containingSizer; }
 
     // accessibility
     wxSizer *GetContainingSizer() const { return m_containingSizer; }
 
     // accessibility


@@ -832,17 +872,6 @@ public:
     wxAccessible* GetOrCreateAccessible() ;
 #endif
 
     wxAccessible* GetOrCreateAccessible() ;
 #endif
 

-    // backward compatibility
-    // ----------------------
-#if WXWIN_COMPATIBILITY
-    bool Enabled() const { return IsEnabled(); }
-
-    void SetButtonFont(const wxFont& font) { SetFont(font); }
-    void SetLabelFont(const wxFont& font) { SetFont(font); }
-    wxFont& GetLabelFont() { return GetFont(); };
-    wxFont& GetButtonFont() { return GetFont(); };
-#endif // WXWIN_COMPATIBILITY
-

     // implementation
     // --------------
 
     // implementation
     // --------------
 


@@ -854,7 +883,14 @@ public:
     void OnHelp(wxHelpEvent& event);
 #endif // wxUSE_HELP
 
     void OnHelp(wxHelpEvent& event);
 #endif // wxUSE_HELP
 

-        // get the haqndle of the window for the underlying window system: this
+        // virtual function for implementing internal idle
+        // behaviour
+        virtual void OnInternalIdle() {}
+
+        // call internal idle recursively
+//        void ProcessInternalIdle() ;
+
+        // get the handle of the window for the underlying window system: this

         // is only used for wxWin itself or for user code which wants to call
         // platform-specific APIs
     virtual WXWidget GetHandle() const = 0;
         // is only used for wxWin itself or for user code which wants to call
         // platform-specific APIs
     virtual WXWidget GetHandle() const = 0;


@@ -876,6 +912,11 @@ public:
 #endif // wxUSE_PALETTE
 
 protected:
 #endif // wxUSE_PALETTE
 
 protected:

+    // event handling specific to wxWindow
+    virtual bool TryValidator(wxEvent& event);
+    virtual bool TryParent(wxEvent& event);
+
+

 #if wxUSE_CONSTRAINTS
     // satisfy the constraints for the windows but don't set the window sizes
     void SatisfyConstraints();
 #if wxUSE_CONSTRAINTS
     // satisfy the constraints for the windows but don't set the window sizes
     void SatisfyConstraints();


@@ -986,10 +1027,6 @@ protected:
     int                   m_maxVirtualWidth;
     int                   m_maxVirtualHeight;
 
     int                   m_maxVirtualWidth;
     int                   m_maxVirtualHeight;
 

-    // common part of all ctors: it is not virtual because it is called from
-    // ctor
-    void InitBase();
-

     // override this to change the default (i.e. used when no style is
     // specified) border for the window class
     virtual wxBorder GetDefaultBorder() const;
     // override this to change the default (i.e. used when no style is
     // specified) border for the window class
     virtual wxBorder GetDefaultBorder() const;


@@ -1080,9 +1117,11 @@ protected:
     virtual bool DoPopupMenu( wxMenu *menu, int x, int y ) = 0;
 #endif // wxUSE_MENUS
 
     virtual bool DoPopupMenu( wxMenu *menu, int x, int y ) = 0;
 #endif // wxUSE_MENUS
 

-    // Makes an adjustment to the window position (for example, a frame that has
-    // a toolbar that it manages itself).
-    virtual void AdjustForParentClientOrigin(int& x, int& y, int sizeFlags) const;
+    // Makes an adjustment to the window position to make it relative to the
+    // parents client area, e.g. if the parent is a frame with a toolbar, its
+    // (0, 0) is just below the toolbar
+    virtual void AdjustForParentClientOrigin(int& x, int& y,
+                                             int sizeFlags = 0) const;

 
 
 private:
 
 
 private:


@@ -1108,7 +1147,6 @@ private:
         #define wxWindowNative wxWindowMSW
     #else // !wxUniv
         #define wxWindowMSW wxWindow
         #define wxWindowNative wxWindowMSW
     #else // !wxUniv
         #define wxWindowMSW wxWindow

-        #define sm_classwxWindowMSW sm_classwxWindow

     #endif // wxUniv/!wxUniv
     #include "wx/msw/window.h"
 #elif defined(__WXMOTIF__)
     #endif // wxUniv/!wxUniv
     #include "wx/msw/window.h"
 #elif defined(__WXMOTIF__)


@@ -1118,7 +1156,6 @@ private:
         #define wxWindowNative wxWindowGTK
     #else // !wxUniv
         #define wxWindowGTK wxWindow
         #define wxWindowNative wxWindowGTK
     #else // !wxUniv
         #define wxWindowGTK wxWindow

-        #define sm_classwxWindowGTK sm_classwxWindow

     #endif // wxUniv
     #include "wx/gtk/window.h"
 #elif defined(__WXX11__)
     #endif // wxUniv
     #include "wx/gtk/window.h"
 #elif defined(__WXX11__)


@@ -1126,7 +1163,6 @@ private:
         #define wxWindowNative wxWindowX11
     #else // !wxUniv
         #define wxWindowX11 wxWindow
         #define wxWindowNative wxWindowX11
     #else // !wxUniv
         #define wxWindowX11 wxWindow

-        #define sm_classwxWindowX11 sm_classwxWindow

     #endif // wxUniv
     #include "wx/x11/window.h"
 #elif defined(__WXMGL__)
     #endif // wxUniv
     #include "wx/x11/window.h"
 #elif defined(__WXMGL__)


@@ -1134,7 +1170,6 @@ private:
         #define wxWindowNative wxWindowMGL
     #else // !wxUniv
         #define wxWindowMGL wxWindow
         #define wxWindowNative wxWindowMGL
     #else // !wxUniv
         #define wxWindowMGL wxWindow

-        #define sm_classwxWindowMGL sm_classwxWindow

     #endif // wxUniv
     #include "wx/mgl/window.h"
 #elif defined(__WXMAC__)
     #endif // wxUniv
     #include "wx/mgl/window.h"
 #elif defined(__WXMAC__)


@@ -1142,7 +1177,6 @@ private:
         #define wxWindowNative wxWindowMac
     #else // !wxUniv
         #define wxWindowMac wxWindow
         #define wxWindowNative wxWindowMac
     #else // !wxUniv
         #define wxWindowMac wxWindow

-        #define sm_classwxWindowMac sm_classwxWindow

     #endif // wxUniv
     #include "wx/mac/window.h"
 #elif defined(__WXCOCOA__)
     #endif // wxUniv
     #include "wx/mac/window.h"
 #elif defined(__WXCOCOA__)


@@ -1150,7 +1184,6 @@ private:
         #define wxWindowNative wxWindowCocoa
     #else // !wxUniv
         #define wxWindowCocoa wxWindow
         #define wxWindowNative wxWindowCocoa
     #else // !wxUniv
         #define wxWindowCocoa wxWindow

-        #define sm_classwxWindowCocoa sm_classwxWindow

     #endif // wxUniv
     #include "wx/cocoa/window.h"
 #elif defined(__WXPM__)
     #endif // wxUniv
     #include "wx/cocoa/window.h"
 #elif defined(__WXPM__)


@@ -1158,7 +1191,6 @@ private:
         #define wxWindowNative wxWindowOS2
     #else // !wxUniv
         #define wxWindowOS2 wxWindow
         #define wxWindowNative wxWindowOS2
     #else // !wxUniv
         #define wxWindowOS2 wxWindow

-        #define sm_classwxWindowOS2 sm_classwxWindow

     #endif // wxUniv/!wxUniv
     #include "wx/os2/window.h"
 #endif
     #endif // wxUniv/!wxUniv
     #include "wx/os2/window.h"
 #endif


@@ -1288,7 +1320,7 @@ public:
         // Gets a variant representing the selected children
         // of this object.
         // Acceptable values:
         // Gets a variant representing the selected children
         // of this object.
         // Acceptable values:

-        // - a null variant (IsNull() returns TRUE)
+        // - a null variant (IsNull() returns true)

         // - a list variant (GetType() == wxT("list")
         // - an integer representing the selected child element,
         //   or 0 if this object is selected (GetType() == wxT("long")
         // - a list variant (GetType() == wxT("list")
         // - an integer representing the selected child element,
         //   or 0 if this object is selected (GetType() == wxT("long")