backported changes from gtk/window.cpp rev 1.678 (bug 1531348)

[wxWidgets.git] / src / gtk1 / listbox.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        src/gtk1/listbox.cpp
// Purpose:
// Author:      Robert Roebling
// Id:          $Id$
// Copyright:   (c) 1998 Robert Roebling
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"

#if wxUSE_LISTBOX

#include "wx/listbox.h"

#ifndef WX_PRECOMP
    #include "wx/dynarray.h"
    #include "wx/intl.h"
    #include "wx/utils.h"
    #include "wx/settings.h"
    #include "wx/checklst.h"
    #include "wx/arrstr.h"
#endif

#include "wx/gtk1/private.h"

#if wxUSE_TOOLTIPS
    #include "wx/tooltip.h"
#endif

#include <gdk/gdk.h>
#include <gtk/gtk.h>
#include <gdk/gdkkeysyms.h>

//-----------------------------------------------------------------------------
// idle system
//-----------------------------------------------------------------------------

extern void wxapp_install_idle_handler();
extern bool g_isIdle;

//-----------------------------------------------------------------------------
// data
//-----------------------------------------------------------------------------

extern bool           g_blockEventsOnDrag;
extern bool           g_blockEventsOnScroll;
extern wxCursor       g_globalCursor;
extern wxWindowGTK   *g_delayedFocus;
extern wxWindowGTK   *g_focusWindow;
extern wxWindowGTK   *g_focusWindowLast;

static bool       g_hasDoubleClicked = false;

//-----------------------------------------------------------------------------
// idle callback for SetFirstItem
//-----------------------------------------------------------------------------

struct wxlistbox_idle_struct
{
    wxListBox   *m_listbox;
    int          m_item;
    gint         m_tag;
};

extern "C" {
static gint wxlistbox_idle_callback( gpointer gdata )
{
    wxlistbox_idle_struct* data = (wxlistbox_idle_struct*) gdata;
    gdk_threads_enter();

    gtk_idle_remove( data->m_tag );

    // check that the items haven't been deleted from the listbox since we had
    // installed this callback
    wxListBox *lbox = data->m_listbox;
    if ( data->m_item < (int)lbox->GetCount() )
    {
        lbox->SetFirstItem( data->m_item );
    }

    delete data;

    gdk_threads_leave();

    return TRUE;
}
}

//-----------------------------------------------------------------------------
// "focus_in_event"
//-----------------------------------------------------------------------------

extern "C" {
static gint gtk_listitem_focus_in_callback( GtkWidget *widget,
                                          GdkEvent *WXUNUSED(event),
                                          wxWindow *win )
{
    if (g_isIdle)
        wxapp_install_idle_handler();

    g_focusWindowLast =
    g_focusWindow = win;

    // does the window itself think that it has the focus?
    if ( !win->m_hasFocus )
    {
        // not yet, notify it
        win->m_hasFocus = true;

        wxChildFocusEvent eventChildFocus(win);
        (void)win->GetEventHandler()->ProcessEvent(eventChildFocus);

        wxFocusEvent eventFocus(wxEVT_SET_FOCUS, win->GetId());
        eventFocus.SetEventObject(win);

        (void)win->GetEventHandler()->ProcessEvent(eventFocus);
    }

    return FALSE;
}
}

//-----------------------------------------------------------------------------
// "focus_out_event"
//-----------------------------------------------------------------------------

extern "C" {
static gint gtk_listitem_focus_out_callback( GtkWidget *widget, GdkEventFocus *gdk_event, wxWindowGTK *win )
{
    if (g_isIdle)
        wxapp_install_idle_handler();

    g_focusWindow = (wxWindowGTK *)NULL;

    // don't send the window a kill focus event if it thinks that it doesn't
    // have focus already
    if ( win->m_hasFocus )
    {
        win->m_hasFocus = false;

        wxFocusEvent event( wxEVT_KILL_FOCUS, win->GetId() );
        event.SetEventObject( win );

        // even if we did process the event in wx code, still let GTK itself
        // process it too as otherwise bad things happen, especially in GTK2
        // where the text control simply aborts the program if it doesn't get
        // the matching focus out event
        (void)win->GetEventHandler()->ProcessEvent( event );
    }

    return FALSE;
}
}

//-----------------------------------------------------------------------------
// "button_release_event"
//-----------------------------------------------------------------------------

/* we would normally emit a wxEVT_COMMAND_LISTBOX_DOUBLECLICKED event once
   a GDK_2BUTTON_PRESS occurs, but this has the particular problem of the
   listbox keeping the focus until it receives a GDK_BUTTON_RELEASE event.
   this can lead to race conditions so that we emit the dclick event
   after the GDK_BUTTON_RELEASE event after the GDK_2BUTTON_PRESS event */

extern "C" {
static gint
gtk_listbox_button_release_callback( GtkWidget * WXUNUSED(widget),
                                     GdkEventButton * WXUNUSED(gdk_event),
                                     wxListBox *listbox )
{
    if (g_isIdle) wxapp_install_idle_handler();

    if (g_blockEventsOnDrag) return FALSE;
    if (g_blockEventsOnScroll) return FALSE;

    if (!listbox->m_hasVMT) return FALSE;

    if (!g_hasDoubleClicked) return FALSE;

    wxCommandEvent event( wxEVT_COMMAND_LISTBOX_DOUBLECLICKED, listbox->GetId() );
    event.SetEventObject( listbox );

    wxArrayInt aSelections;
    int n, count = listbox->GetSelections(aSelections);
    if ( count > 0 )
    {
        n = aSelections[0];
        if ( listbox->HasClientObjectData() )
            event.SetClientObject( listbox->GetClientObject(n) );
        else if ( listbox->HasClientUntypedData() )
            event.SetClientData( listbox->GetClientData(n) );
        event.SetString( listbox->GetString(n) );
    }
    else
    {
        n = -1;
    }

    event.SetInt(n);

    listbox->GetEventHandler()->ProcessEvent( event );

    return FALSE;
}
}

//-----------------------------------------------------------------------------
// "button_press_event"
//-----------------------------------------------------------------------------

extern "C" {
static gint
gtk_listbox_button_press_callback( GtkWidget *widget,
                                   GdkEventButton *gdk_event,
                                   wxListBox *listbox )
{
    if (g_isIdle) wxapp_install_idle_handler();

    if (g_blockEventsOnDrag) return FALSE;
    if (g_blockEventsOnScroll) return FALSE;

    if (!listbox->m_hasVMT) return FALSE;

    int sel = listbox->GtkGetIndex( widget );

#if wxUSE_CHECKLISTBOX
    if ((listbox->m_hasCheckBoxes) && (gdk_event->x < 15) && (gdk_event->type != GDK_2BUTTON_PRESS))
    {
        wxCheckListBox *clb = (wxCheckListBox *)listbox;

        clb->Check( sel, !clb->IsChecked(sel) );

        wxCommandEvent event( wxEVT_COMMAND_CHECKLISTBOX_TOGGLED, listbox->GetId() );
        event.SetEventObject( listbox );
        event.SetInt( sel );
        listbox->GetEventHandler()->ProcessEvent( event );
    }
#endif // wxUSE_CHECKLISTBOX

    if ((gdk_event->state == 0) &&
         (((listbox->GetWindowStyleFlag() & wxLB_MULTIPLE) != 0) ||
          ((listbox->GetWindowStyleFlag() & wxLB_EXTENDED) != 0)) )
    {
            listbox->m_blockEvent = true;

            int i;
            for (i = 0; i < (int)listbox->GetCount(); i++)
                if (i != sel)
                    gtk_list_unselect_item( GTK_LIST(listbox->m_list), i );

            listbox->m_blockEvent = false;

            return false;
    }

    /* emit wxEVT_COMMAND_LISTBOX_DOUBLECLICKED later */
    g_hasDoubleClicked = (gdk_event->type == GDK_2BUTTON_PRESS);

    return FALSE;
}
}

//-----------------------------------------------------------------------------
// "key_press_event"
//-----------------------------------------------------------------------------

extern "C" {
static gint
gtk_listbox_key_press_callback( GtkWidget *widget, GdkEventKey *gdk_event, wxListBox *listbox )
{
    if (g_isIdle)
        wxapp_install_idle_handler();

    if (g_blockEventsOnDrag)
        return FALSE;

    bool ret = false;

    if ((gdk_event->keyval == GDK_Tab) || (gdk_event->keyval == GDK_ISO_Left_Tab))
    {
        wxNavigationKeyEvent new_event;
        /* GDK reports GDK_ISO_Left_Tab for SHIFT-TAB */
        new_event.SetDirection( (gdk_event->keyval == GDK_Tab) );
        /* CTRL-TAB changes the (parent) window, i.e. switch notebook page */
        new_event.SetWindowChange( (gdk_event->state & GDK_CONTROL_MASK) );
        new_event.SetCurrentFocus( listbox );
        ret = listbox->GetEventHandler()->ProcessEvent( new_event );
    }

    if ((gdk_event->keyval == GDK_Return) && (!ret))
    {
        // eat return in all modes
        ret = true;
    }

#if wxUSE_CHECKLISTBOX
    if ((gdk_event->keyval == ' ') && (listbox->m_hasCheckBoxes) && (!ret))
    {
        int sel = listbox->GtkGetIndex( widget );

        wxCheckListBox *clb = (wxCheckListBox *)listbox;

        clb->Check( sel, !clb->IsChecked(sel) );

        wxCommandEvent new_event( wxEVT_COMMAND_CHECKLISTBOX_TOGGLED, listbox->GetId() );
        new_event.SetEventObject( listbox );
        new_event.SetInt( sel );
        ret = listbox->GetEventHandler()->ProcessEvent( new_event );
    }
#endif // wxUSE_CHECKLISTBOX

    // Check or uncheck item with SPACE
    if ((gdk_event->keyval == ' ') && (!ret) &&
         (((listbox->GetWindowStyleFlag() & wxLB_MULTIPLE) != 0) ||
          ((listbox->GetWindowStyleFlag() & wxLB_EXTENDED) != 0)) )
    {
        int sel = listbox->GtkGetIndex( widget );

        if (sel != -1)
        {
            ret = true;

            if (listbox->IsSelected( sel ))
                gtk_list_unselect_item( listbox->m_list, sel );
            else
                gtk_list_select_item( listbox->m_list, sel );

            wxCommandEvent new_event(wxEVT_COMMAND_LISTBOX_SELECTED, listbox->GetId() );
            new_event.SetEventObject( listbox );
            wxArrayInt aSelections;
            int n, count = listbox->GetSelections(aSelections);
            if ( count > 0 )
            {
                n = aSelections[0];
                if ( listbox->HasClientObjectData() )
                    new_event.SetClientObject( listbox->GetClientObject(n) );
                else if ( listbox->HasClientUntypedData() )
                    new_event.SetClientData( listbox->GetClientData(n) );
                new_event.SetString( listbox->GetString(n) );
            }
            else
            {
                n = -1;
            }
            new_event.SetInt(n);
            listbox->GetEventHandler()->ProcessEvent( new_event );
        }
    }

    if (ret)
    {
        gtk_signal_emit_stop_by_name( GTK_OBJECT(widget), "key_press_event" );
        return TRUE;
    }

    return FALSE;
}
}

//-----------------------------------------------------------------------------
// "select" and "deselect"
//-----------------------------------------------------------------------------

static void gtk_listitem_select_cb( GtkWidget *widget,
                                    wxListBox *listbox,
                                    bool is_selection )
{
    if (g_isIdle) wxapp_install_idle_handler();

    if (!listbox->m_hasVMT) return;
    if (g_blockEventsOnDrag) return;

    if (listbox->m_blockEvent) return;

    wxCommandEvent event(wxEVT_COMMAND_LISTBOX_SELECTED, listbox->GetId() );
    event.SetEventObject( listbox );

    // indicate whether this is a selection or a deselection
    event.SetExtraLong( is_selection );

    if ((listbox->GetWindowStyleFlag() & wxLB_SINGLE) != 0)
    {
        int sel = listbox->GtkGetIndex( widget );

        if (listbox->m_prevSelection != sel)
            gtk_list_unselect_item( listbox->m_list, listbox->m_prevSelection );

        listbox->m_prevSelection = sel;
    }

    wxArrayInt aSelections;
    int n, count = listbox->GetSelections(aSelections);
    if ( count > 0 )
    {
        n = aSelections[0];
        if ( listbox->HasClientObjectData() )
            event.SetClientObject( listbox->GetClientObject(n) );
        else if ( listbox->HasClientUntypedData() )
            event.SetClientData( listbox->GetClientData(n) );
        event.SetString( listbox->GetString(n) );
    }
    else
    {
        n = -1;
    }

    event.SetInt(n);

//    No longer required with new code in wxLB_SINGLE
//    listbox->GetEventHandler()->AddPendingEvent( event );
    listbox->GetEventHandler()->ProcessEvent( event );
}

extern "C" {
static void gtk_listitem_select_callback( GtkWidget *widget, wxListBox *listbox )
{
    gtk_listitem_select_cb( widget, listbox, TRUE );
}
}

extern "C" {
static void gtk_listitem_deselect_callback( GtkWidget *widget, wxListBox *listbox )
{
    gtk_listitem_select_cb( widget, listbox, FALSE );
}
}

//-----------------------------------------------------------------------------
// wxListBox
//-----------------------------------------------------------------------------

extern "C" {
static gint
gtk_listbox_realized_callback( GtkWidget *m_widget, wxListBox *win )
{
    if (g_isIdle)
        wxapp_install_idle_handler();

    GList *child = win->m_list->children;
    for (child = win->m_list->children; child != NULL; child = child->next)
        gtk_widget_show( GTK_WIDGET(child->data) );

    return false;
}
}

//-----------------------------------------------------------------------------
// wxListBox
//-----------------------------------------------------------------------------

IMPLEMENT_DYNAMIC_CLASS(wxListBox,wxControl)

// ----------------------------------------------------------------------------
// construction
// ----------------------------------------------------------------------------

wxListBox::wxListBox()
{
    m_list = (GtkList *) NULL;
#if wxUSE_CHECKLISTBOX
    m_hasCheckBoxes = false;
#endif // wxUSE_CHECKLISTBOX
}

bool wxListBox::Create( wxWindow *parent, wxWindowID id,
                        const wxPoint &pos, const wxSize &size,
                        const wxArrayString& choices,
                        long style, const wxValidator& validator,
                        const wxString &name )
{
    wxCArrayString chs(choices);

    return Create( parent, id, pos, size, chs.GetCount(), chs.GetStrings(),
                   style, validator, name );
}

bool wxListBox::Create( wxWindow *parent, wxWindowID id,
                        const wxPoint &pos, const wxSize &size,
                        int n, const wxString choices[],
                        long style, const wxValidator& validator,
                        const wxString &name )
{
    m_needParent = true;
    m_acceptsFocus = true;
    m_prevSelection = 0;  // or -1 ??
    m_blockEvent = false;

    if (!PreCreation( parent, pos, size ) ||
        !CreateBase( parent, id, pos, size, style, validator, name ))
    {
        wxFAIL_MSG( wxT("wxListBox creation failed") );
        return false;
    }

    m_widget = gtk_scrolled_window_new( (GtkAdjustment*) NULL, (GtkAdjustment*) NULL );
    if (style & wxLB_ALWAYS_SB)
    {
      gtk_scrolled_window_set_policy( GTK_SCROLLED_WINDOW(m_widget),
        GTK_POLICY_AUTOMATIC, GTK_POLICY_ALWAYS );
    }
    else
    {
      gtk_scrolled_window_set_policy( GTK_SCROLLED_WINDOW(m_widget),
        GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC );
    }

    m_list = GTK_LIST( gtk_list_new() );

    GtkSelectionMode mode;
    if (style & wxLB_MULTIPLE)
    {
        mode = GTK_SELECTION_MULTIPLE;
    }
    else if (style & wxLB_EXTENDED)
    {
        mode = GTK_SELECTION_EXTENDED;
    }
    else
    {
        // if style was 0 set single mode
        m_windowStyle |= wxLB_SINGLE;
        mode = GTK_SELECTION_SINGLE;
    }

    gtk_list_set_selection_mode( GTK_LIST(m_list), mode );

    gtk_scrolled_window_add_with_viewport( GTK_SCROLLED_WINDOW(m_widget), GTK_WIDGET(m_list) );

    /* make list scroll when moving the focus down using cursor keys */
    gtk_container_set_focus_vadjustment(
        GTK_CONTAINER(m_list),
        gtk_scrolled_window_get_vadjustment(
            GTK_SCROLLED_WINDOW(m_widget)));

    gtk_widget_show( GTK_WIDGET(m_list) );

    gtk_signal_connect( GTK_OBJECT(m_list), "realize",
                        GTK_SIGNAL_FUNC(gtk_listbox_realized_callback), (gpointer) this );

    if ( style & wxLB_SORT )
    {
        // this will change DoAppend() behaviour
        m_strings = new wxSortedArrayString;
    }
    else
    {
        m_strings = (wxSortedArrayString *)NULL;
    }

    for (int i = 0; i < n; i++)
    {
        // add one by one
        DoAppend(choices[i]);
    }

    m_parent->DoAddChild( this );

    PostCreation(size);
    SetInitialSize(size); // need this too because this is a wxControlWithItems

    return true;
}

wxListBox::~wxListBox()
{
    m_hasVMT = false;

    Clear();

    if (m_strings)
      delete m_strings;
}

// ----------------------------------------------------------------------------
// adding items
// ----------------------------------------------------------------------------

void wxListBox::DoInsertItems(const wxArrayString& items, unsigned int pos)
{
    wxCHECK_RET( m_list != NULL, wxT("invalid listbox") );

    // VZ: notice that InsertItems knows nothing about sorting, so calling it
    //     from outside (and not from our own Append) is likely to break
    //     everything

    // code elsewhere supposes we have as many items in m_clientList as items
    // in the listbox
    wxASSERT_MSG( m_clientList.GetCount() == GetCount(),
                  wxT("bug in client data management") );

    InvalidateBestSize();

    GList *children = m_list->children;
    unsigned int length = g_list_length(children);

    wxCHECK_RET( pos <= length, wxT("invalid index in wxListBox::InsertItems") );

    unsigned int nItems = items.GetCount();
    int index;

    if (m_strings)
    {
        for (unsigned int n = 0; n < nItems; n++)
        {
            index = m_strings->Add( items[n] );

            if (index != (int)GetCount())
            {
                GtkAddItem( items[n], index );
                wxList::compatibility_iterator node = m_clientList.Item( index );
                m_clientList.Insert( node, (wxObject*) NULL );
            }
            else
            {
                GtkAddItem( items[n] );
                m_clientList.Append( (wxObject*) NULL );
            }
        }
    }
    else
    {
        if (pos == length)
        {
            for ( unsigned int n = 0; n < nItems; n++ )
            {
                GtkAddItem( items[n] );

                m_clientList.Append((wxObject *)NULL);
            }
        }
        else
        {
            wxList::compatibility_iterator node = m_clientList.Item( pos );
            for ( unsigned int n = 0; n < nItems; n++ )
            {
                GtkAddItem( items[n], pos+n );

                m_clientList.Insert( node, (wxObject *)NULL );
            }
        }
    }

    wxASSERT_MSG( m_clientList.GetCount() == GetCount(),
                      wxT("bug in client data management") );
}

int wxListBox::DoAppend( const wxString& item )
{
    InvalidateBestSize();

    if (m_strings)
    {
        // need to determine the index
        int index = m_strings->Add( item );

        // only if not at the end anyway
        if (index != (int)GetCount())
        {
           GtkAddItem( item, index );

           wxList::compatibility_iterator node = m_clientList.Item( index );
           m_clientList.Insert( node, (wxObject *)NULL );

           return index;
        }
    }

    GtkAddItem(item);

    m_clientList.Append((wxObject *)NULL);

    return GetCount() - 1;
}

void wxListBox::GtkAddItem( const wxString &item, int pos )
{
    wxCHECK_RET( m_list != NULL, wxT("invalid listbox") );

    GtkWidget *list_item;

    wxString label(item);
#if wxUSE_CHECKLISTBOX
    if (m_hasCheckBoxes)
    {
        label.Prepend(wxCHECKLBOX_STRING);
    }
#endif // wxUSE_CHECKLISTBOX

    list_item = gtk_list_item_new_with_label( wxGTK_CONV( label ) );

    GList *gitem_list = g_list_alloc ();
    gitem_list->data = list_item;

    if (pos == -1)
        gtk_list_append_items( GTK_LIST (m_list), gitem_list );
    else
        gtk_list_insert_items( GTK_LIST (m_list), gitem_list, pos );

    gtk_signal_connect_after( GTK_OBJECT(list_item), "select",
      GTK_SIGNAL_FUNC(gtk_listitem_select_callback), (gpointer)this );

    if (HasFlag(wxLB_MULTIPLE) || HasFlag(wxLB_EXTENDED))
        gtk_signal_connect_after( GTK_OBJECT(list_item), "deselect",
          GTK_SIGNAL_FUNC(gtk_listitem_deselect_callback), (gpointer)this );

    gtk_signal_connect( GTK_OBJECT(list_item),
                        "button_press_event",
                        (GtkSignalFunc)gtk_listbox_button_press_callback,
                        (gpointer) this );

    gtk_signal_connect_after( GTK_OBJECT(list_item),
                        "button_release_event",
                        (GtkSignalFunc)gtk_listbox_button_release_callback,
                        (gpointer) this );

    gtk_signal_connect( GTK_OBJECT(list_item),
                           "key_press_event",
                           (GtkSignalFunc)gtk_listbox_key_press_callback,
                           (gpointer)this );


    gtk_signal_connect( GTK_OBJECT(list_item), "focus_in_event",
            GTK_SIGNAL_FUNC(gtk_listitem_focus_in_callback), (gpointer)this );

    gtk_signal_connect( GTK_OBJECT(list_item), "focus_out_event",
            GTK_SIGNAL_FUNC(gtk_listitem_focus_out_callback), (gpointer)this );

    ConnectWidget( list_item );

    if (GTK_WIDGET_REALIZED(m_widget))
    {
        gtk_widget_show( list_item );

        gtk_widget_realize( list_item );
        gtk_widget_realize( GTK_BIN(list_item)->child );

#if wxUSE_TOOLTIPS
        if (m_tooltip) m_tooltip->Apply( this );
#endif
    }

    // Apply current widget style to the new list_item
    GtkRcStyle *style = CreateWidgetStyle();
    if (style)
    {
        gtk_widget_modify_style( GTK_WIDGET( list_item ), style );
        GtkBin *bin = GTK_BIN( list_item );
        gtk_widget_modify_style( GTK_WIDGET( bin->child ), style );
        gtk_rc_style_unref( style );
    }
}

void wxListBox::DoSetItems( const wxArrayString& items,
                            void **clientData)
{
    Clear();

    DoInsertItems(items, 0);

    if ( clientData )
    {
        unsigned int count = items.GetCount();
        for ( unsigned int n = 0; n < count; n++ )
        {
            SetClientData(n, clientData[n]);
        }
    }
}

// ----------------------------------------------------------------------------
// deleting items
// ----------------------------------------------------------------------------

void wxListBox::Clear()
{
    wxCHECK_RET( m_list != NULL, wxT("invalid listbox") );

    gtk_list_clear_items( m_list, 0, (int)GetCount() );

    if ( GTK_LIST(m_list)->last_focus_child != NULL  )
    {
        // This should be NULL, I think.
        GTK_LIST(m_list)->last_focus_child = NULL;
    }

    if ( HasClientObjectData() )
    {
        // destroy the data (due to Robert's idea of using wxList<wxObject>
        // and not wxList<wxClientData> we can't just say
        // m_clientList.DeleteContents(true) - this would crash!
        wxList::compatibility_iterator node = m_clientList.GetFirst();
        while ( node )
        {
            delete (wxClientData *)node->GetData();
            node = node->GetNext();
        }
    }
    m_clientList.Clear();

    if ( m_strings )
        m_strings->Clear();
}

void wxListBox::Delete(unsigned int n)
{
    wxCHECK_RET( m_list != NULL, wxT("invalid listbox") );

    GList *child = g_list_nth( m_list->children, n );

    wxCHECK_RET( child, wxT("wrong listbox index") );

    GList *list = g_list_append( (GList*) NULL, child->data );
    gtk_list_remove_items( m_list, list );
    g_list_free( list );

    wxList::compatibility_iterator node = m_clientList.Item( n );
    if ( node )
    {
        if ( m_clientDataItemsType == wxClientData_Object )
        {
            wxClientData *cd = (wxClientData*)node->GetData();
            delete cd;
        }

        m_clientList.Erase( node );
    }

    if ( m_strings )
        m_strings->RemoveAt(n);
}

// ----------------------------------------------------------------------------
// client data
// ----------------------------------------------------------------------------

void wxListBox::DoSetItemClientData(unsigned int n, void* clientData)
{
    wxCHECK_RET( m_widget != NULL, wxT("invalid listbox control") );

    wxList::compatibility_iterator node = m_clientList.Item( n );
    wxCHECK_RET( node, wxT("invalid index in wxListBox::DoSetItemClientData") );

    node->SetData( (wxObject*) clientData );
}

void* wxListBox::DoGetItemClientData(unsigned int n) const
{
    wxCHECK_MSG( m_widget != NULL, NULL, wxT("invalid listbox control") );

    wxList::compatibility_iterator node = m_clientList.Item( n );
    wxCHECK_MSG( node, NULL, wxT("invalid index in wxListBox::DoGetItemClientData") );

    return node->GetData();
}

void wxListBox::DoSetItemClientObject(unsigned int n, wxClientData* clientData)
{
    wxCHECK_RET( m_widget != NULL, wxT("invalid listbox control") );

    wxList::compatibility_iterator node = m_clientList.Item( n );
    wxCHECK_RET( node, wxT("invalid index in wxListBox::DoSetItemClientObject") );

    // wxItemContainer already deletes data for us

    node->SetData( (wxObject*) clientData );
}

wxClientData* wxListBox::DoGetItemClientObject(unsigned int n) const
{
    wxCHECK_MSG( m_widget != NULL, (wxClientData*) NULL, wxT("invalid listbox control") );

    wxList::compatibility_iterator node = m_clientList.Item( n );
    wxCHECK_MSG( node, (wxClientData *)NULL,
                 wxT("invalid index in wxListBox::DoGetItemClientObject") );

    return (wxClientData*) node->GetData();
}

// ----------------------------------------------------------------------------
// string list access
// ----------------------------------------------------------------------------

wxString wxListBox::GetRealLabel(GList *item) const
{
    GtkBin *bin = GTK_BIN( item->data );
    GtkLabel *label = GTK_LABEL( bin->child );

    wxString str;

    str = wxString( label->label );

#if wxUSE_CHECKLISTBOX