drawing optimization fix

[wxWidgets.git] / src / motif / menu.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        menu.cpp
// Purpose:     wxMenu, wxMenuBar, wxMenuItem
// Author:      Julian Smart
// Modified by:
// Created:     17/09/98
// RCS-ID:      $Id$
// Copyright:   (c) Julian Smart
// Licence:   	wxWindows licence
/////////////////////////////////////////////////////////////////////////////


// ============================================================================
// headers & declarations
// ============================================================================

// wxWindows headers
// -----------------

#ifdef __GNUG__
#pragma implementation "menu.h"
#pragma implementation "menuitem.h"
#endif

#include "wx/menu.h"
#include "wx/menuitem.h"
#include "wx/log.h"
#include "wx/utils.h"
#include "wx/app.h"
#include "wx/frame.h"

#include <Xm/Label.h>
#include <Xm/LabelG.h>
#include <Xm/CascadeBG.h>
#include <Xm/CascadeB.h>
#include <Xm/SeparatoG.h>
#include <Xm/PushBG.h>
#include <Xm/ToggleB.h>
#include <Xm/ToggleBG.h>
#include <Xm/RowColumn.h>

#include "wx/motif/private.h"

// other standard headers
// ----------------------
#include <string.h>

#if !USE_SHARED_LIBRARY
IMPLEMENT_DYNAMIC_CLASS(wxMenu, wxEvtHandler)
IMPLEMENT_DYNAMIC_CLASS(wxMenuBar, wxEvtHandler)
#endif

// ============================================================================
// implementation
// ============================================================================

// Menus

// Construct a menu with optional title (then use append)
wxMenu::wxMenu(const wxString& title, const wxFunction func)
{
    m_title = title;
    m_parent = (wxEvtHandler*) NULL;
    m_eventHandler = this;
    m_noItems = 0;
    m_menuBar = NULL;

    //// Motif-specific members
    m_numColumns = 1;
    m_menuWidget = (WXWidget) NULL;
    m_popupShell = (WXWidget) NULL;
    m_buttonWidget = (WXWidget) NULL;
    m_menuId = 0;
    m_topLevelMenu  = (wxMenu*) NULL;
    m_ownedByMenuBar = FALSE;
    m_menuParent = (wxMenu*) NULL;
    m_clientData = (void*) NULL;

    if (m_title != "")
    {
        Append(ID_SEPARATOR, m_title) ;
        AppendSeparator() ;
    }

    Callback(func);
}

// The wxWindow destructor will take care of deleting the submenus.
wxMenu::~wxMenu()
{
    if (m_menuWidget)
    {
      if (m_menuParent)
        DestroyMenu(TRUE);
      else
        DestroyMenu(FALSE);
    }

    // Not sure if this is right
    if (m_menuParent && m_menuBar)
    {
      m_menuParent = NULL;
      //      m_menuBar = NULL;
    }

    wxNode *node = m_menuItems.First();
    while (node)
    {
        wxMenuItem *item = (wxMenuItem *)node->Data();

	/*
        if (item->GetSubMenu())
            item->DeleteSubMenu();
        */

        wxNode *next = node->Next();
        delete item;
        delete node;
        node = next;
    }
}

void wxMenu::Break()
{
    m_numColumns ++;
}

// function appends a new item or submenu to the menu
void wxMenu::Append(wxMenuItem *pItem)
{
    wxCHECK_RET( pItem != NULL, "can't append NULL item to the menu" );

    m_menuItems.Append(pItem);

    if (m_menuWidget)
      pItem->CreateItem (m_menuWidget, m_menuBar, m_topLevelMenu);	// this is a dynamic Append

    m_noItems++;
}

void wxMenu::AppendSeparator()
{
    Append(new wxMenuItem(this, ID_SEPARATOR));
}

// Pullright item
// N.B.: difference between old and new code.
// Old code stores subMenu in 'children' for later deletion,
// as well as in m_menuItems, whereas we only store it in
// m_menuItems here. What implications does this have?

void wxMenu::Append(int id, const wxString& label, wxMenu *subMenu, 
                    const wxString& helpString)
{
    Append(new wxMenuItem(this, id, label, helpString, FALSE, subMenu));

    subMenu->m_topLevelMenu = m_topLevelMenu;
}

// Ordinary menu item
void wxMenu::Append(int id, const wxString& label, 
                    const wxString& helpString, bool checkable)
{
  // 'checkable' parameter is useless for Windows.
    Append(new wxMenuItem(this, id, label, helpString, checkable));
}

void wxMenu::Delete(int id)
{
    wxNode *node;
    wxMenuItem *item;
    int pos;

    for (pos = 0, node = m_menuItems.First(); node; node = node->Next(), pos++) 
    {
	 item = (wxMenuItem *)node->Data();
	 if (item->GetId() == id)
		break;
    }

    if (!node)
	return;

    item->DestroyItem(TRUE);

    // See also old code - don't know if this is needed (seems redundant).
    /*
  if (item->GetSubMenu()) {
    item->subMenu->top_level_menu = item->GetSubMenu();
    item->subMenu->window_parent = NULL;
    children->DeleteObject(item->GetSubMenu());
  }
  */

    m_menuItems.DeleteNode(node);
    delete item;
}

void wxMenu::Enable(int id, bool flag)
{
    wxMenuItem *item = FindItemForId(id);
    wxCHECK_RET( item != NULL, "can't enable non-existing menu item" );

    item->Enable(flag);
}

bool wxMenu::Enabled(int Id) const
{
    wxMenuItem *item = FindItemForId(Id);
    wxCHECK( item != NULL, FALSE );

    return item->IsEnabled();
}

void wxMenu::Check(int Id, bool Flag)
{
    wxMenuItem *item = FindItemForId(Id);
    wxCHECK_RET( item != NULL, "can't get status of non-existing menu item" );

    item->Check(Flag);
}

bool wxMenu::Checked(int id) const
{
    wxMenuItem *item = FindItemForId(id);
    wxCHECK( item != NULL, FALSE );

    return item->IsChecked();
}

void wxMenu::SetTitle(const wxString& label)
{
    m_title = label ;

    wxNode *node = m_menuItems.First ();
    if (!node)
      return;

    wxMenuItem *item = (wxMenuItem *) node->Data ();
    Widget widget = (Widget) item->GetButtonWidget();
    if (!widget)
      return;

    XmString title_str = XmStringCreateSimple ((char*) (const char*) label);
    XtVaSetValues (widget,
                   XmNlabelString, title_str,
                   NULL);
    // TODO: should we delete title_str now?
}

const wxString wxMenu::GetTitle() const
{
    return m_title;
}

void wxMenu::SetLabel(int id, const wxString& label)
{
    wxMenuItem *item = FindItemForId(id);
    if (item == (wxMenuItem*) NULL)
      return;

    item->SetLabel(label);
}

wxString wxMenu::GetLabel(int id) const
{
  wxMenuItem *it = NULL;
  WXWidget w = FindMenuItem (id, &it);
  if (w)
    {
      XmString text;
      char *s;
      XtVaGetValues ((Widget) w,
		     XmNlabelString, &text,
		     NULL);

      if (XmStringGetLtoR (text, XmSTRING_DEFAULT_CHARSET, &s))
	{
	  wxString str(s);
	  XtFree (s);
	  return str;
	}
      else
	{
	  XmStringFree (text);
	  return wxEmptyString;
	}
    }
  else
    return wxEmptyString;
}

// Finds the item id matching the given string, -1 if not found.
int wxMenu::FindItem (const wxString& itemString) const
{
    char buf1[200];
    char buf2[200];
    wxStripMenuCodes ((char *)(const char *)itemString, buf1);

    for (wxNode * node = m_menuItems.First (); node; node = node->Next ())
    {
      wxMenuItem *item = (wxMenuItem *) node->Data ();
      if (item->GetSubMenu())
      {
        int ans = item->GetSubMenu()->FindItem(itemString);
        if (ans > -1)
          return ans;
      }
      if ( !item->IsSeparator() )
      {
        wxStripMenuCodes((char *)item->GetName().c_str(), buf2);
        if (strcmp(buf1, buf2) == 0)
          return item->GetId();
      }
    }

    return -1;
}

wxMenuItem *wxMenu::FindItemForId(int itemId, wxMenu ** itemMenu) const
{
    if (itemMenu)
        *itemMenu = NULL;
    for (wxNode * node = m_menuItems.First (); node; node = node->Next ())
    {
        wxMenuItem *item = (wxMenuItem *) node->Data ();

        if (item->GetId() == itemId)
        {
            if (itemMenu)
                *itemMenu = (wxMenu *) this;
            return item;
        }

        if (item->GetSubMenu())
        {
            wxMenuItem *ans = item->GetSubMenu()->FindItemForId (itemId, itemMenu);
            if (ans)
                return ans;
        }
    }

    if (itemMenu)
        *itemMenu = NULL;
    return NULL;
}

void wxMenu::SetHelpString(int itemId, const wxString& helpString)
{
    wxMenuItem *item = FindItemForId (itemId);
    if (item)
        item->SetHelp(helpString);
}

wxString wxMenu::GetHelpString (int itemId) const
{
    wxMenuItem *item = FindItemForId (itemId);
    wxString str("");
    return (item == NULL) ? str : item->GetHelp();
}

void wxMenu::ProcessCommand(wxCommandEvent & event)
{
    bool processed = FALSE;

    // Try a callback
    if (m_callback)
    {
            (void) (*(m_callback)) (*this, event);
            processed = TRUE;
    }

    // Try the menu's event handler
    if ( !processed && GetEventHandler())
    {
            processed = GetEventHandler()->ProcessEvent(event);
    }
/* TODO
    // Try the window the menu was popped up from (and up
    // through the hierarchy)
    if ( !processed && GetInvokingWindow())
        processed = GetInvokingWindow()->ProcessEvent(event);
*/
}

bool wxWindow::PopupMenu(wxMenu *menu, int x, int y)
{
  Widget widget = (Widget) GetMainWidget();

  /* The menuId field seems to be usused, so we'll use it to
     indicate whether a menu is popped up or not:
        0: Not currently created as a popup
       -1: Created as a popup, but not active
        1: Active popup.
   */

  if (menu->GetParent() && (menu->GetId() != -1))
    return FALSE;

  if (menu->GetMainWidget()) {
    menu->DestroyMenu(TRUE);
  }

  wxWindow *parent = this;

  menu->SetId(1); /* Mark as popped-up */
  menu->CreateMenu(NULL, widget, menu);
  //  menu->SetParent(parent);
  //  parent->children->Append(menu);  // Store menu for later deletion

  Widget menuWidget = (Widget) menu->GetMainWidget();

  int rootX = 0;
  int rootY = 0;

  int deviceX = x;
  int deviceY = y;
  /*
  if (this->IsKindOf(CLASSINFO(wxCanvas)))
  {
    wxCanvas *canvas = (wxCanvas *) this;
    deviceX = canvas->GetDC ()->LogicalToDeviceX (x);
    deviceY = canvas->GetDC ()->LogicalToDeviceY (y);
  }
  */

  Display *display = XtDisplay (widget);
  Window rootWindow = RootWindowOfScreen (XtScreen((Widget)widget));
  Window thisWindow = XtWindow (widget);
  Window childWindow;
  XTranslateCoordinates (display, thisWindow, rootWindow, (int) deviceX, (int) deviceY,
			 &rootX, &rootY, &childWindow);

  XButtonPressedEvent event;
  event.type = ButtonPress;
  event.button = 1;

  event.x = deviceX;
  event.y = deviceY;

  event.x_root = rootX;
  event.y_root = rootY;

  XmMenuPosition (menuWidget, &event);
  XtManageChild (menuWidget);

  return TRUE;
}

// Menu Bar
wxMenuBar::wxMenuBar()
{
    m_eventHandler = this;
    m_menuCount = 0;
    m_menus = NULL;
    m_titles = NULL;
    m_menuBarFrame = NULL;
    m_mainWidget = (WXWidget) NULL;
}

wxMenuBar::wxMenuBar(int n, wxMenu *menus[], const wxString titles[])
{
    m_eventHandler = this;
    m_menuCount = n;
    m_menus = menus;
    m_titles = new wxString[n];
    int i;
    for ( i = 0; i < n; i++ )
	m_titles[i] = titles[i];
    m_menuBarFrame = NULL;
}

wxMenuBar::~wxMenuBar()
{
    int i;
    for (i = 0; i < m_menuCount; i++)
    {
        delete m_menus[i];
    }
    delete[] m_menus;
    delete[] m_titles;
}

// Must only be used AFTER menu has been attached to frame,
// otherwise use individual menus to enable/disable items
void wxMenuBar::Enable(int id, bool flag)
{
    wxMenu *itemMenu = NULL;
    wxMenuItem *item = FindItemForId(id, &itemMenu) ;
    if (!item)
        return;
    item->Enable(flag);
}

void wxMenuBar::EnableTop(int pos, bool flag)
{
    // TODO
}

// Must only be used AFTER menu has been attached to frame,
// otherwise use individual menus
void wxMenuBar::Check(int id, bool flag)
{
    wxMenu *itemMenu = NULL;
    wxMenuItem *item = FindItemForId(id, &itemMenu) ;
    if (!item)
        return;

    if (!item->IsCheckable())
        return ;

    item->Check(flag);
}

bool wxMenuBar::Checked(int id) const
{
    wxMenu *itemMenu = NULL;
    wxMenuItem *item = FindItemForId(id, &itemMenu) ;
    if (!item)
        return FALSE;

    return item->IsChecked();
}

bool wxMenuBar::Enabled(int id) const
{
    wxMenu *itemMenu = NULL;
    wxMenuItem *item = FindItemForId(id, &itemMenu) ;
    if (!item)
        return FALSE;

    return item->IsEnabled();
}

void wxMenuBar::SetLabel(int id, const wxString& label)
{
    wxMenu *itemMenu = NULL;
    wxMenuItem *item = FindItemForId(id, &itemMenu) ;

    if (!item)
        return;

    item->SetLabel(label);
}

wxString wxMenuBar::GetLabel(int id) const
{
    wxMenu *itemMenu = NULL;
    wxMenuItem *item = FindItemForId(id, &itemMenu) ;

    if (!item)
        return wxString("");

    return item->GetLabel();
}

void wxMenuBar::SetLabelTop(int pos, const wxString& label)
{
  wxASSERT( (pos < m_menuCount) );

  Widget w = (Widget) m_menus[pos]->GetButtonWidget();
  if (w)
    {
      XmString label_str = XmStringCreateSimple ((char*) (const char*) label);
      XtVaSetValues (w,
		     XmNlabelString, label_str,
		     NULL);
      XmStringFree (label_str);
    }
}

wxString wxMenuBar::GetLabelTop(int pos) const
{
  wxASSERT( (pos < m_menuCount) );

  Widget w = (Widget) m_menus[pos]->GetButtonWidget();
  if (w)
    {
      XmString text;
      char *s;
      XtVaGetValues (w,
		     XmNlabelString, &text,
		     NULL);

      if (XmStringGetLtoR (text, XmSTRING_DEFAULT_CHARSET, &s))
	{
	  wxString str(s);
	  XtFree (s);
	  return str;
	}
      else
	{
	  return wxEmptyString;
	}
    }
  else
    return wxEmptyString;

}

bool wxMenuBar::OnDelete(wxMenu *menu, int pos)
{
    // Only applies to dynamic deletion (when set in frame)
    if (!m_menuBarFrame)
        return TRUE;

    menu->DestroyMenu(TRUE);
    return TRUE;
}

bool wxMenuBar::OnAppend(wxMenu *menu, const char *title)
{
    // Only applies to dynamic append (when set in frame)
    if (!m_menuBarFrame)
        return TRUE;

    // Probably should be an assert here
    if (menu->GetParent())
        return FALSE;

    // Has already been appended
    if (menu->GetButtonWidget())
        return FALSE;

    WXWidget w = menu->CreateMenu(this, GetMainWidget(), menu, title, TRUE);
    menu->SetButtonWidget(w);

    return TRUE;
}

void wxMenuBar::Append (wxMenu * menu, const wxString& title)
{
    if (!OnAppend(menu, title))
        return;

    m_menuCount ++;
    wxMenu **new_menus = new wxMenu *[m_menuCount];
    wxString *new_titles = new wxString[m_menuCount];
    int i;

    for (i = 0; i < m_menuCount - 1; i++)
	{
        new_menus[i] = m_menus[i];
        m_menus[i] = NULL;
        new_titles[i] = m_titles[i];
        m_titles[i] = "";
    }
    if (m_menus)
    {
        delete[]m_menus;
        delete[]m_titles;
    }
    m_menus = new_menus;
    m_titles = new_titles;

    m_menus[m_menuCount - 1] = (wxMenu *)menu;
    m_titles[m_menuCount - 1] = title;

    menu->SetMenuBar(this);
    menu->SetParent(this);
}

void wxMenuBar::Delete(wxMenu * menu, int i)
{
    int j;
    int ii = (int) i;

    if (menu != 0)
    {
	    for (ii = 0; ii < m_menuCount; ii++)
        {
            if (m_menus[ii] == menu)
            break;
	    }
        if (ii >= m_menuCount)
            return;
    } else
    {
        if (ii < 0 || ii >= m_menuCount)
            return;
        menu = m_menus[ii];
    }

    if (!OnDelete(menu, ii))
        return;

    menu->SetParent((wxEvtHandler*) NULL);

    -- m_menuCount;
    for (j = ii; j < m_menuCount; j++)
    {
        m_menus[j] = m_menus[j + 1];
        m_titles[j] = m_titles[j + 1];
    }
}

// Find the menu menuString, item itemString, and return the item id.
// Returns -1 if none found.
int wxMenuBar::FindMenuItem (const wxString& menuString, const wxString& itemString) const
{
    char buf1[200];
    char buf2[200];
    wxStripMenuCodes ((char *)(const char *)menuString, buf1);
    int i;
    for (i = 0; i < m_menuCount; i++)
    {
        wxStripMenuCodes ((char *)(const char *)m_titles[i], buf2);
        if (strcmp (buf1, buf2) == 0)
            return m_menus[i]->FindItem (itemString);
    }
    return -1;
}

wxMenuItem *wxMenuBar::FindItemForId (int id, wxMenu ** itemMenu) const
{
    if (itemMenu)
        *itemMenu = NULL;

    wxMenuItem *item = NULL;
    int i;
    for (i = 0; i < m_menuCount; i++)
        if ((item = m_menus[i]->FindItemForId (id, itemMenu)))
            return item;
    return NULL;
}

void wxMenuBar::SetHelpString (int id, const wxString& helpString)
{
    int i;
    for (i = 0; i < m_menuCount; i++)
    {
        if (m_menus[i]->FindItemForId (id))
        {
            m_menus[i]->SetHelpString (id, helpString);
            return;
        }
    }
}

wxString wxMenuBar::GetHelpString (int id) const
{
    int i;
    for (i = 0; i < m_menuCount; i++)
    {
        if (m_menus[i]->FindItemForId (id))
            return wxString(m_menus[i]->GetHelpString (id));
    }
    return wxString("");
}

// Create menubar
bool wxMenuBar::CreateMenuBar(wxFrame* parent)
{
  if (m_mainWidget)
  {
    XtVaSetValues((Widget) parent->GetMainWindowWidget(), XmNmenuBar, (Widget) m_mainWidget, NULL);
    /*
    if (!XtIsManaged((Widget) m_mainWidget))
      XtManageChild((Widget) m_mainWidget);
      */
    XtMapWidget((Widget) m_mainWidget);
    return TRUE;
  }

  Widget menuBarW = XmCreateMenuBar ((Widget) parent->GetMainWindowWidget(), "MenuBar", NULL, 0);
  m_mainWidget = (WXWidget) menuBarW;

  int i;
  for (i = 0; i < GetMenuCount(); i++)
    {
      wxMenu *menu = GetMenu(i);
      wxString title(m_titles[i]);
      menu->SetButtonWidget(menu->CreateMenu (this, menuBarW, menu, title, TRUE));

      /*
       * COMMENT THIS OUT IF YOU DON'T LIKE A RIGHT-JUSTIFIED HELP MENU
       */
      wxStripMenuCodes ((char*) (const char*) title, wxBuffer);

      if (strcmp (wxBuffer, "Help") == 0)
        XtVaSetValues ((Widget) menuBarW, XmNmenuHelpWidget, (Widget) menu->GetButtonWidget(), NULL);
    }

  XtVaSetValues((Widget) parent->GetMainWindowWidget(), XmNmenuBar, (Widget) m_mainWidget, NULL);
  XtRealizeWidget ((Widget) menuBarW);
  XtManageChild ((Widget) menuBarW);
  SetMenuBarFrame(parent);

  return TRUE;
}

// Destroy menubar, but keep data structures intact so we can recreate it.
bool wxMenuBar::DestroyMenuBar()
{
  if (!m_mainWidget)
  {
      SetMenuBarFrame((wxFrame*) NULL);
      return FALSE;
  }

  XtUnmanageChild ((Widget) m_mainWidget);
  XtUnrealizeWidget ((Widget) m_mainWidget);

  int i;
  for (i = 0; i < GetMenuCount(); i++)
    {
      wxMenu *menu = GetMenu(i);
      menu->DestroyMenu(TRUE);

    }
  XtDestroyWidget((Widget) m_mainWidget);
  m_mainWidget = (WXWidget) 0;

  SetMenuBarFrame((wxFrame*) NULL);

  return TRUE;
}

//// Motif-specific

extern wxApp *wxTheApp;
static XtWorkProcId WorkProcMenuId;

/* Since PopupMenu under Motif stills grab right mouse button events
 * after it was closed, we need to delete the associated widgets to
 * allow next PopUpMenu to appear...
 */

int PostDeletionOfMenu( XtPointer* clientData )
{
  XtRemoveWorkProc(WorkProcMenuId);
  wxMenu *menu = (wxMenu *)clientData;

  if (menu->GetMainWidget()) {
    if (menu->GetParent())
    {
      wxList& list = menu->GetParent()->GetItems();
      list.DeleteObject(menu);
    }
    menu->DestroyMenu(TRUE);
  }
  /* Mark as no longer popped up */
  menu->m_menuId = -1;
  return TRUE;
}

void 
wxMenuPopdownCallback(Widget w, XtPointer clientData,
		      XtPointer ptr)
{
  wxMenu *menu = (wxMenu *)clientData;

  // Added by JOREL Jean-Charles <jjorel@silr.ireste.fr>
  /* Since Callbacks of MenuItems are not yet processed, we put a
   * background job which will be done when system will be idle.
   * What awful hack!! :(
   */

  WorkProcMenuId = XtAppAddWorkProc( 
		(XtAppContext) wxTheApp->GetAppContext(), 
		(XtWorkProc) PostDeletionOfMenu,
		(XtPointer) menu );
  // Apparently not found in Motif headers
  //  XtVaSetValues( w, XmNpopupEnabled, XmPOPUP_DISABLED, NULL );
}

/*
 * Create a popup or pulldown menu.
 * Submenus of a popup will be pulldown.
 *
 */

WXWidget wxMenu::CreateMenu (wxMenuBar * menuBar, WXWidget parent, wxMenu * topMenu, const wxString& title, bool pullDown)
{
  Widget menu = (Widget) 0;
  Widget buttonWidget = (Widget) 0;
  Arg args[5];
  XtSetArg (args[0], XmNnumColumns, m_numColumns);
  XtSetArg (args[1], XmNpacking, XmPACK_COLUMN);

  if (!pullDown)
    {
      menu = XmCreatePopupMenu ((Widget) parent, "popup", args, 2);
      XtAddCallback(menu,
		    XmNunmapCallback, 
		    (XtCallbackProc)wxMenuPopdownCallback,
		    (XtPointer)this);
    }
  else
    {
      char mnem = wxFindMnemonic (title);
      wxStripMenuCodes ((char*) (const char*) title, wxBuffer);

      menu = XmCreatePulldownMenu ((Widget) parent, "pulldown", args, 2);

      XmString label_str = XmStringCreateSimple (wxBuffer);
      buttonWidget = XtVaCreateManagedWidget (wxBuffer,
#if wxUSE_GADGETS
					 xmCascadeButtonGadgetClass, (Widget) parent,
#else
					 xmCascadeButtonWidgetClass, (Widget) parent,
#endif
					      XmNlabelString, label_str,
					      XmNsubMenuId, menu,
					      NULL);

      if (mnem != 0)
	XtVaSetValues (buttonWidget, XmNmnemonic, mnem, NULL);

      XmStringFree (label_str);
    }

  m_menuWidget = (WXWidget) menu;

  m_menuBar = menuBar;
  m_topLevelMenu = topMenu;

  for (wxNode * node = m_menuItems.First (); node; node = node->Next ())
    {
      wxMenuItem *item = (wxMenuItem *) node->Data ();
      item->CreateItem (menu, menuBar, topMenu);
    }

  return buttonWidget;
}

// Destroys the Motif implementation of the menu,
// but maintains the wxWindows data structures so we can
// do a CreateMenu again. 
void wxMenu::DestroyMenu (bool full)
{
  for (wxNode * node = m_menuItems.First (); node; node = node->Next ())
    {
      wxMenuItem *item = (wxMenuItem *) node->Data ();
      item->SetMenuBar((wxMenuBar*) NULL);

      item->DestroyItem(full);
    }				// for()

  if (m_buttonWidget)
    {
      if (full)
      {
        XtVaSetValues((Widget) m_buttonWidget, XmNsubMenuId, NULL, NULL);
        XtDestroyWidget ((Widget) m_buttonWidget);
        m_buttonWidget = (WXWidget) 0;
      }
    }
  if (m_menuWidget && full)
    {
      XtDestroyWidget((Widget) m_menuWidget);
      m_menuWidget = (WXWidget) NULL;
    }
}

WXWidget wxMenu::FindMenuItem (int id, wxMenuItem ** it) const
{
  if (id == m_menuId)
    {
      if (it)
	*it = (wxMenuItem*) NULL;
      return m_buttonWidget;
    }

  for (wxNode * node = m_menuItems.First (); node; node = node->Next ())
    {
      wxMenuItem *item = (wxMenuItem *) node->Data ();
      if (item->GetId() == id)
	{
	  if (it)
	    *it = item;
	  return item->GetButtonWidget();
	}

      if (item->GetSubMenu())
	{
	  WXWidget w = item->GetSubMenu()->FindMenuItem (id, it);
	  if (w)
	    {
	      return w;
	    }
	}
    }				// for()

  if (it)
    *it = (wxMenuItem*) NULL;
  return (WXWidget) NULL;
}