X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/11e62fe658531aaa2891351f19bd0a4c076717ae..be8b43858c480325553a66a43c9fcd92d036b885:/src/msw/listbox.cpp

diff --git a/src/msw/listbox.cpp b/src/msw/listbox.cpp
index e8bfb9b75c..82b06b1432 100644
--- a/src/msw/listbox.cpp
+++ b/src/msw/listbox.cpp
@@ -18,23 +18,24 @@
 
 #if wxUSE_LISTBOX
 
-#ifndef WX_PRECOMP
 #include "wx/listbox.h"
-#include "wx/settings.h"
-#include "wx/brush.h"
-#include "wx/font.h"
-#include "wx/dc.h"
-#include "wx/utils.h"
+
+#ifndef WX_PRECOMP
+    #include "wx/dynarray.h"
+    #include "wx/settings.h"
+    #include "wx/brush.h"
+    #include "wx/font.h"
+    #include "wx/dc.h"
+    #include "wx/utils.h"
+    #include "wx/log.h"
+    #include "wx/window.h"
 #endif
 
-#include "wx/window.h"
 #include "wx/msw/private.h"
+#include "wx/msw/dc.h"
 
 #include <windowsx.h>
 
-#include "wx/dynarray.h"
-#include "wx/log.h"
-
 #if wxUSE_OWNER_DRAWN
     #include  "wx/ownerdrw.h"
 #endif
@@ -80,7 +81,7 @@ wxBEGIN_FLAGS( wxListBoxStyle )
 
 wxEND_FLAGS( wxListBoxStyle )
 
-IMPLEMENT_DYNAMIC_CLASS_XTI(wxListBox, wxControl,"wx/listbox.h")
+IMPLEMENT_DYNAMIC_CLASS_XTI(wxListBox, wxControlWithItems,"wx/listbox.h")
 
 wxBEGIN_PROPERTIES_TABLE(wxListBox)
     wxEVENT_PROPERTY( Select , wxEVT_COMMAND_LISTBOX_SELECTED , wxCommandEvent )
@@ -97,7 +98,7 @@ wxEND_HANDLERS_TABLE()
 
 wxCONSTRUCTOR_4( wxListBox , wxWindow* , Parent , wxWindowID , Id , wxPoint , Position , wxSize , Size )
 #else
-IMPLEMENT_DYNAMIC_CLASS(wxListBox, wxControl)
+IMPLEMENT_DYNAMIC_CLASS(wxListBox, wxControlWithItems)
 #endif
 
 /*
@@ -144,7 +145,7 @@ wxOwnerDrawn *wxListBox::CreateLboxItem(size_t WXUNUSED(n))
 wxListBox::wxListBox()
 {
     m_noItems = 0;
-    m_selected = 0;
+    m_updateHorizontalExtent = false;
 }
 
 bool wxListBox::Create(wxWindow *parent,
@@ -157,7 +158,7 @@ bool wxListBox::Create(wxWindow *parent,
                        const wxString& name)
 {
     m_noItems = 0;
-    m_selected = 0;
+    m_updateHorizontalExtent = false;
 
     // initialize base class fields
     if ( !CreateControl(parent, id, pos, size, style, validator, name) )
@@ -176,8 +177,9 @@ bool wxListBox::Create(wxWindow *parent,
         Append(choices[i]);
     }
 
-    // now we can compute our best size correctly, so do it if necessary
-    SetBestSize(size);
+    // now we can compute our best size correctly, so do it again
+    InvalidateBestSize();
+    SetInitialSize(size);
 
     return true;
 }
@@ -198,7 +200,7 @@ bool wxListBox::Create(wxWindow *parent,
 
 wxListBox::~wxListBox()
 {
-    Free();
+    Clear();
 }
 
 WXDWORD wxListBox::MSWGetStyle(long style, WXDWORD *exstyle) const
@@ -244,108 +246,41 @@ WXDWORD wxListBox::MSWGetStyle(long style, WXDWORD *exstyle) const
     return msStyle;
 }
 
+void wxListBox::OnInternalIdle()
+{
+    wxWindow::OnInternalIdle();
+    
+    if (m_updateHorizontalExtent)
+    {
+        SetHorizontalExtent(wxEmptyString);
+        m_updateHorizontalExtent = false;
+    }
+}
+
 // ----------------------------------------------------------------------------
 // implementation of wxListBoxBase methods
 // ----------------------------------------------------------------------------
 
 void wxListBox::DoSetFirstItem(int N)
 {
-    wxCHECK_RET( N >= 0 && N < m_noItems,
+    wxCHECK_RET( IsValid(N),
                  wxT("invalid index in wxListBox::SetFirstItem") );
 
     SendMessage(GetHwnd(), LB_SETTOPINDEX, (WPARAM)N, (LPARAM)0);
 }
 
-void wxListBox::Delete(int N)
+void wxListBox::DoDeleteOneItem(unsigned int n)
 {
-    wxCHECK_RET( N >= 0 && N < m_noItems,
+    wxCHECK_RET( IsValid(n),
                  wxT("invalid index in wxListBox::Delete") );
 
-    // for owner drawn objects, the data is used for storing wxOwnerDrawn
-    // pointers and we shouldn't touch it
-#if !wxUSE_OWNER_DRAWN
-    if ( !(m_windowStyle & wxLB_OWNERDRAW) )
-#endif // !wxUSE_OWNER_DRAWN
-        if ( HasClientObjectData() )
-        {
-            delete GetClientObject(N);
-        }
-
-    SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);
+    SendMessage(GetHwnd(), LB_DELETESTRING, n, 0);
     m_noItems--;
 
-    SetHorizontalExtent(wxEmptyString);
+    // SetHorizontalExtent(wxEmptyString); can be slow
+    m_updateHorizontalExtent = true;
 
-    InvalidateBestSize();
-}
-
-int wxListBox::DoAppend(const wxString& item)
-{
-    int index = ListBox_AddString(GetHwnd(), item);
-    m_noItems++;
-
-#if wxUSE_OWNER_DRAWN
-    if ( m_windowStyle & wxLB_OWNERDRAW ) {
-        wxOwnerDrawn *pNewItem = CreateLboxItem(index); // dummy argument
-        pNewItem->SetName(item);
-        m_aItems.Insert(pNewItem, index);
-        ListBox_SetItemData(GetHwnd(), index, pNewItem);
-        pNewItem->SetFont(GetFont());
-    }
-#endif // wxUSE_OWNER_DRAWN
-
-    SetHorizontalExtent(item);
-
-    InvalidateBestSize();
-    return index;
-}
-
-void wxListBox::DoSetItems(const wxArrayString& choices, void** clientData)
-{
-    // avoid flicker - but don't need to do this for a hidden listbox
-    bool hideAndShow = IsShown();
-    if ( hideAndShow )
-    {
-        ShowWindow(GetHwnd(), SW_HIDE);
-    }
-
-    ListBox_ResetContent(GetHwnd());
-
-    m_noItems = choices.GetCount();
-    int i;
-    for (i = 0; i < m_noItems; i++)
-    {
-        ListBox_AddString(GetHwnd(), choices[i]);
-        if ( clientData )
-        {
-            SetClientData(i, clientData[i]);
-        }
-    }
-
-#if wxUSE_OWNER_DRAWN
-    if ( m_windowStyle & wxLB_OWNERDRAW ) {
-        // first delete old items
-        WX_CLEAR_ARRAY(m_aItems);
-
-        // then create new ones
-        for ( size_t ui = 0; ui < (size_t)m_noItems; ui++ ) {
-            wxOwnerDrawn *pNewItem = CreateLboxItem(ui);
-            pNewItem->SetName(choices[ui]);
-            m_aItems.Add(pNewItem);
-            ListBox_SetItemData(GetHwnd(), ui, pNewItem);
-        }
-    }
-#endif // wxUSE_OWNER_DRAWN
-
-    SetHorizontalExtent();
-
-    if ( hideAndShow )
-    {
-        // show the listbox back if we hid it
-        ShowWindow(GetHwnd(), SW_SHOW);
-    }
-
-    InvalidateBestSize();
+    UpdateOldSelections();
 }
 
 int wxListBox::FindString(const wxString& s, bool bCase) const
@@ -354,23 +289,23 @@ int wxListBox::FindString(const wxString& s, bool bCase) const
     if (bCase)
        return wxItemContainerImmutable::FindString( s, bCase );
 
-    int pos = ListBox_FindStringExact(GetHwnd(), (WPARAM)-1, s);
+    int pos = ListBox_FindStringExact(GetHwnd(), -1, s.wx_str());
     if (pos == LB_ERR)
         return wxNOT_FOUND;
     else
         return pos;
 }
 
-void wxListBox::Clear()
+void wxListBox::DoClear()
 {
     Free();
 
     ListBox_ResetContent(GetHwnd());
 
     m_noItems = 0;
-    SetHorizontalExtent();
+    m_updateHorizontalExtent = true;
 
-    InvalidateBestSize();
+    UpdateOldSelections();
 }
 
 void wxListBox::Free()
@@ -380,21 +315,12 @@ void wxListBox::Free()
     {
         WX_CLEAR_ARRAY(m_aItems);
     }
-    else
 #endif // wxUSE_OWNER_DRAWN
-    if ( HasClientObjectData() )
-    {
-        for ( size_t n = 0; n < (size_t)m_noItems; n++ )
-        {
-            delete GetClientObject(n);
-        }
-    }
 }
 
 void wxListBox::DoSetSelection(int N, bool select)
 {
-    wxCHECK_RET( N == wxNOT_FOUND ||
-                    (N >= 0 && N < m_noItems),
+    wxCHECK_RET( N == wxNOT_FOUND || IsValid(N),
                  wxT("invalid index in wxListBox::SetSelection") );
 
     if ( HasMultipleSelection() )
@@ -405,48 +331,31 @@ void wxListBox::DoSetSelection(int N, bool select)
     {
         SendMessage(GetHwnd(), LB_SETCURSEL, select ? N : -1, 0);
     }
+
+    UpdateOldSelections();
 }
 
 bool wxListBox::IsSelected(int N) const
 {
-    wxCHECK_MSG( N >= 0 && N < m_noItems, false,
+    wxCHECK_MSG( IsValid(N), false,
                  wxT("invalid index in wxListBox::Selected") );
 
     return SendMessage(GetHwnd(), LB_GETSEL, N, 0) == 0 ? false : true;
 }
 
-wxClientData* wxListBox::DoGetItemClientObject(int n) const
-{
-    return (wxClientData *)DoGetItemClientData(n);
-}
-
-void *wxListBox::DoGetItemClientData(int n) const
+void *wxListBox::DoGetItemClientData(unsigned int n) const
 {
-    wxCHECK_MSG( n >= 0 && n < m_noItems, NULL,
+    wxCHECK_MSG( IsValid(n), NULL,
                  wxT("invalid index in wxListBox::GetClientData") );
 
     return (void *)SendMessage(GetHwnd(), LB_GETITEMDATA, n, 0);
 }
 
-void wxListBox::DoSetItemClientObject(int n, wxClientData* clientData)
-{
-    DoSetItemClientData(n, clientData);
-}
-
-void wxListBox::DoSetItemClientData(int n, void *clientData)
+void wxListBox::DoSetItemClientData(unsigned int n, void *clientData)
 {
-    wxCHECK_RET( n >= 0 && n < m_noItems,
+    wxCHECK_RET( IsValid(n),
                  wxT("invalid index in wxListBox::SetClientData") );
 
-#if wxUSE_OWNER_DRAWN
-    if ( m_windowStyle & wxLB_OWNERDRAW )
-    {
-        // client data must be pointer to wxOwnerDrawn, otherwise we would crash
-        // in OnMeasure/OnDraw.
-        wxFAIL_MSG(wxT("Can't use client data with owner-drawn listboxes"));
-    }
-#endif // wxUSE_OWNER_DRAWN
-
     if ( ListBox_SetItemData(GetHwnd(), n, clientData) == LB_ERR )
         wxLogDebug(wxT("LB_SETITEMDATA failed"));
 }
@@ -505,165 +414,180 @@ int wxListBox::GetSelection() const
 }
 
 // Find string for position
-wxString wxListBox::GetString(int N) const
+wxString wxListBox::GetString(unsigned int n) const
 {
-    wxCHECK_MSG( N >= 0 && N < m_noItems, wxEmptyString,
+    wxCHECK_MSG( IsValid(n), wxEmptyString,
                  wxT("invalid index in wxListBox::GetString") );
 
-    int len = ListBox_GetTextLen(GetHwnd(), N);
+    int len = ListBox_GetTextLen(GetHwnd(), n);
 
     // +1 for terminating NUL
     wxString result;
-    ListBox_GetText(GetHwnd(), N, (wxChar*)wxStringBuffer(result, len + 1));
+    ListBox_GetText(GetHwnd(), n, (wxChar*)wxStringBuffer(result, len + 1));
 
     return result;
 }
 
-void
-wxListBox::DoInsertItems(const wxArrayString& items, int pos)
+int wxListBox::DoInsertItems(const wxArrayStringsAdapter & items,
+                             unsigned int pos,
+                             void **clientData,
+                             wxClientDataType type)
 {
-    wxCHECK_RET( pos >= 0 && pos <= m_noItems,
-                 wxT("invalid index in wxListBox::InsertItems") );
+    MSWAllocStorage(items, LB_INITSTORAGE);
+
+    const bool append = pos == GetCount();
+
+    // we must use CB_ADDSTRING when appending as only it works correctly for
+    // the sorted controls
+    const unsigned msg = append ? LB_ADDSTRING : LB_INSERTSTRING;
+
+    if ( append )
+        pos = 0;
+
+    int n = wxNOT_FOUND;
 
-    int nItems = items.GetCount();
-    for ( int i = 0; i < nItems; i++ )
+    const unsigned int numItems = items.GetCount();
+    for ( unsigned int i = 0; i < numItems; i++ )
     {
-        int idx = ListBox_InsertString(GetHwnd(), i + pos, items[i]);
+        n = MSWInsertOrAppendItem(pos, items[i], msg);
+        if ( n == wxNOT_FOUND )
+            return n;
+
+        if ( !append )
+            pos++;
+
+        ++m_noItems;
 
 #if wxUSE_OWNER_DRAWN
-        if ( m_windowStyle & wxLB_OWNERDRAW )
+        if ( HasFlag(wxLB_OWNERDRAW) )
         {
-            wxOwnerDrawn *pNewItem = CreateLboxItem(idx);
+            wxOwnerDrawn *pNewItem = CreateLboxItem(n);
             pNewItem->SetName(items[i]);
             pNewItem->SetFont(GetFont());
-            m_aItems.Insert(pNewItem, idx);
-
-            ListBox_SetItemData(GetHwnd(), idx, pNewItem);
+            m_aItems.Insert(pNewItem, n);
         }
-#else
-        wxUnusedVar(idx);
 #endif // wxUSE_OWNER_DRAWN
+        AssignNewItemClientData(n, clientData, i, type);
     }
 
-    m_noItems += nItems;
+    m_updateHorizontalExtent = true;
 
-    SetHorizontalExtent();
+    UpdateOldSelections();
 
-    InvalidateBestSize();
+    return n;
 }
 
-void wxListBox::SetString(int N, const wxString& s)
+int wxListBox::DoListHitTest(const wxPoint& point) const
 {
-    wxCHECK_RET( N >= 0 && N < m_noItems,
+    LRESULT lRes =  ::SendMessage(GetHwnd(), LB_ITEMFROMPOINT,
+                                  0L, MAKELONG(point.x, point.y));
+
+    // non zero high-order word means that this item is outside of the client
+    // area, IOW the point is outside of the listbox
+    return HIWORD(lRes) ? wxNOT_FOUND : lRes;
+}
+
+void wxListBox::SetString(unsigned int n, const wxString& s)
+{
+    wxCHECK_RET( IsValid(n),
                  wxT("invalid index in wxListBox::SetString") );
 
     // remember the state of the item
-    bool wasSelected = IsSelected(N);
+    bool wasSelected = IsSelected(n);
 
     void *oldData = NULL;
     wxClientData *oldObjData = NULL;
-    if ( m_clientDataItemsType == wxClientData_Void )
-        oldData = GetClientData(N);
-    else if ( m_clientDataItemsType == wxClientData_Object )
-        oldObjData = GetClientObject(N);
+    if ( HasClientUntypedData() )
+        oldData = GetClientData(n);
+    else if ( HasClientObjectData() )
+        oldObjData = GetClientObject(n);
 
     // delete and recreate it
-    SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);
+    SendMessage(GetHwnd(), LB_DELETESTRING, n, 0);
 
-    int newN = N;
-    if ( N == m_noItems - 1 )
+    int newN = n;
+    if ( n == (m_noItems - 1) )
         newN = -1;
 
-    ListBox_InsertString(GetHwnd(), newN, s);
+    ListBox_InsertString(GetHwnd(), newN, s.wx_str());
 
     // restore the client data
     if ( oldData )
-        SetClientData(N, oldData);
+        SetClientData(n, oldData);
     else if ( oldObjData )
-        SetClientObject(N, oldObjData);
+        SetClientObject(n, oldObjData);
 
 #if wxUSE_OWNER_DRAWN
     if ( m_windowStyle & wxLB_OWNERDRAW )
     {
         // update item's text
-        m_aItems[N]->SetName(s);
-
-        // reassign the item's data
-        ListBox_SetItemData(GetHwnd(), N, m_aItems[N]);
+        m_aItems[n]->SetName(s);
     }
 #endif  //USE_OWNER_DRAWN
 
     // we may have lost the selection
     if ( wasSelected )
-        Select(N);
+        Select(n);
 
-    InvalidateBestSize();
+    m_updateHorizontalExtent = true;
 }
 
-int wxListBox::GetCount() const
+unsigned int wxListBox::GetCount() const
 {
     return m_noItems;
 }
 
 // ----------------------------------------------------------------------------
-// helpers
+// size-related stuff
 // ----------------------------------------------------------------------------
 
-// Windows-specific code to set the horizontal extent of the listbox, if
-// necessary. If s is non-NULL, it's used to calculate the horizontal extent.
-// Otherwise, all strings are used.
 void wxListBox::SetHorizontalExtent(const wxString& s)
 {
-    // Only necessary if we want a horizontal scrollbar
-    if (!(m_windowStyle & wxHSCROLL))
+    // in any case, our best size could have changed
+    InvalidateBestSize();
+
+    // the rest is only necessary if we want a horizontal scrollbar
+    if ( !HasFlag(wxHSCROLL) )
         return;
-    TEXTMETRIC lpTextMetric;
 
-    if ( !s.empty() )
-    {
-        int existingExtent = (int)SendMessage(GetHwnd(), LB_GETHORIZONTALEXTENT, 0, 0L);
-        HDC dc = GetWindowDC(GetHwnd());
-        HFONT oldFont = 0;
-        if (GetFont().Ok() && GetFont().GetResourceHandle() != 0)
-            oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
-
-        GetTextMetrics(dc, &lpTextMetric);
-        SIZE extentXY;
-        ::GetTextExtentPoint32(dc, (LPTSTR) (const wxChar *)s, s.Length(), &extentXY);
-        int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 
-        if (oldFont)
-            ::SelectObject(dc, oldFont);
+    WindowHDC dc(GetHwnd());
+    SelectInHDC selFont(dc, GetHfontOf(GetFont()));
 
-        ReleaseDC(GetHwnd(), dc);
-        if (extentX > existingExtent)
-            SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(extentX), 0L);
-    }
-    else
-    {
-        int largestExtent = 0;
-        HDC dc = GetWindowDC(GetHwnd());
-        HFONT oldFont = 0;
-        if (GetFont().Ok() && GetFont().GetResourceHandle() != 0)
-            oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
+    TEXTMETRIC lpTextMetric;
+    ::GetTextMetrics(dc, &lpTextMetric);
 
-        GetTextMetrics(dc, &lpTextMetric);
+    int largestExtent = 0;
+    SIZE extentXY;
 
-        for (int i = 0; i < m_noItems; i++)
+    if ( s.empty() )
+    {
+        // set extent to the max length of all strings
+        for ( unsigned int i = 0; i < m_noItems; i++ )
         {
-            wxString str = GetString(i);
-            SIZE extentXY;
+            const wxString str = GetString(i);
             ::GetTextExtentPoint32(dc, str.c_str(), str.length(), &extentXY);
+
             int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
-            if (extentX > largestExtent)
+            if ( extentX > largestExtent )
                 largestExtent = extentX;
         }
-        if (oldFont)
-            ::SelectObject(dc, oldFont);
+    }
+    else // just increase the extent to the length of this string
+    {
+        int existingExtent = (int)SendMessage(GetHwnd(),
+                                              LB_GETHORIZONTALEXTENT, 0, 0L);
 
-        ReleaseDC(GetHwnd(), dc);
-        SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(largestExtent), 0L);
+        ::GetTextExtentPoint32(dc, s.c_str(), s.length(), &extentXY);
+
+        int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
+        if ( extentX > existingExtent )
+            largestExtent = extentX;
     }
+
+    if ( largestExtent )
+        SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(largestExtent), 0L);
+    //else: it shouldn't change
 }
 
 wxSize wxListBox::DoGetBestSize() const
@@ -671,7 +595,7 @@ wxSize wxListBox::DoGetBestSize() const
     // find the widest string
     int wLine;
     int wListbox = 0;
-    for ( int i = 0; i < m_noItems; i++ )
+    for (unsigned int i = 0; i < m_noItems; i++)
     {
         wxString str(GetString(i));
         GetTextExtent(str, &wLine, NULL);
@@ -709,6 +633,12 @@ wxSize wxListBox::DoGetBestSize() const
 
 bool wxListBox::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 {
+    if ((param == LBN_SELCHANGE) && HasMultipleSelection())
+    {
+        CalcAndSendEvent();
+        return true;
+    }
+
     wxEventType evtType;
     if ( param == LBN_SELCHANGE )
     {
@@ -736,13 +666,16 @@ bool wxListBox::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
         else if ( HasClientUntypedData() )
             event.SetClientData( GetClientData(n) );
 
-        event.SetString( GetString(n) );
-        event.SetExtraLong( HasMultipleSelection() ? IsSelected(n) : true );
+        event.SetString(GetString(n));
+    }
+    else
+    {
+        return false;
     }
 
     event.SetInt(n);
 
-    return GetEventHandler()->ProcessEvent(event);
+    return HandleWindowEvent(event);
 }
 
 // ----------------------------------------------------------------------------
@@ -776,16 +709,19 @@ bool wxListBox::MSWOnMeasure(WXMEASUREITEMSTRUCT *item)
     HDC hdc = CreateIC(wxT("DISPLAY"), NULL, NULL, 0);
 #endif
 
-    wxDC dc;
-    dc.SetHDC((WXHDC)hdc);
-    dc.SetFont(GetFont());
-
-    pStruct->itemHeight = dc.GetCharHeight() + 2*OWNER_DRAWN_LISTBOX_EXTRA_SPACE;
-    pStruct->itemWidth  = dc.GetCharWidth();
+    {
+        wxDCTemp dc((WXHDC)hdc);
+        dc.SetFont(GetFont());
 
-    dc.SetHDC(0);
+        pStruct->itemHeight = dc.GetCharHeight() + 2*OWNER_DRAWN_LISTBOX_EXTRA_SPACE;
+        pStruct->itemWidth  = dc.GetCharWidth();
+    }
 
+#ifdef __WXWINCE__
+    ReleaseDC(NULL, hdc);
+#else
     DeleteDC(hdc);
+#endif
 
     return true;
 }
@@ -797,17 +733,12 @@ bool wxListBox::MSWOnDraw(WXDRAWITEMSTRUCT *item)
     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), false );
 
     DRAWITEMSTRUCT *pStruct = (DRAWITEMSTRUCT *)item;
-    UINT itemID = pStruct->itemID;
 
     // the item may be -1 for an empty listbox
-    if ( itemID == (UINT)-1 )
+    if ( pStruct->itemID == (UINT)-1 )
         return false;
 
-    long data = ListBox_GetItemData(GetHwnd(), pStruct->itemID);
-
-    wxCHECK( data && (data != LB_ERR), false );
-
-    wxListBoxItem *pItem = (wxListBoxItem *)data;
+    wxListBoxItem *pItem = (wxListBoxItem *)m_aItems[pStruct->itemID];
 
     wxDCTemp dc((WXHDC)pStruct->hDC);
     wxPoint pt1(pStruct->rcItem.left, pStruct->rcItem.top);