src/msw/listbox.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/msw/listbox.cpp
   3 // Purpose:     wxListBox
   4 // Author:      Julian Smart
   5 // Modified by: Vadim Zeitlin (owner drawn stuff)
   6 // Created:
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart
   9 // Licence:     wxWindows licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 // For compilers that support precompilation, includes "wx.h".
  13 #include "wx/wxprec.h"
  14
  15 #ifdef __BORLANDC__
  16     #pragma hdrstop
  17 #endif
  18
  19 #if wxUSE_LISTBOX
  20
  21 #include "wx/listbox.h"
  22
  23 #ifndef WX_PRECOMP
  24     #include "wx/dynarray.h"
  25     #include "wx/settings.h"
  26     #include "wx/brush.h"
  27     #include "wx/font.h"
  28     #include "wx/dc.h"
  29     #include "wx/utils.h"
  30     #include "wx/log.h"
  31     #include "wx/window.h"
  32 #endif
  33
  34 #include "wx/msw/private.h"
  35 #include "wx/msw/dc.h"
  36
  37 #include <windowsx.h>
  38
  39 #if wxUSE_OWNER_DRAWN
  40     #include  "wx/ownerdrw.h"
  41 #endif
  42
  43 #if wxUSE_EXTENDED_RTTI
  44 WX_DEFINE_FLAGS( wxListBoxStyle )
  45
  46 wxBEGIN_FLAGS( wxListBoxStyle )
  47     // new style border flags, we put them first to
  48     // use them for streaming out
  49     wxFLAGS_MEMBER(wxBORDER_SIMPLE)
  50     wxFLAGS_MEMBER(wxBORDER_SUNKEN)
  51     wxFLAGS_MEMBER(wxBORDER_DOUBLE)
  52     wxFLAGS_MEMBER(wxBORDER_RAISED)
  53     wxFLAGS_MEMBER(wxBORDER_STATIC)
  54     wxFLAGS_MEMBER(wxBORDER_NONE)
  55
  56     // old style border flags
  57     wxFLAGS_MEMBER(wxSIMPLE_BORDER)
  58     wxFLAGS_MEMBER(wxSUNKEN_BORDER)
  59     wxFLAGS_MEMBER(wxDOUBLE_BORDER)
  60     wxFLAGS_MEMBER(wxRAISED_BORDER)
  61     wxFLAGS_MEMBER(wxSTATIC_BORDER)
  62     wxFLAGS_MEMBER(wxBORDER)
  63
  64     // standard window styles
  65     wxFLAGS_MEMBER(wxTAB_TRAVERSAL)
  66     wxFLAGS_MEMBER(wxCLIP_CHILDREN)
  67     wxFLAGS_MEMBER(wxTRANSPARENT_WINDOW)
  68     wxFLAGS_MEMBER(wxWANTS_CHARS)
  69     wxFLAGS_MEMBER(wxFULL_REPAINT_ON_RESIZE)
  70     wxFLAGS_MEMBER(wxALWAYS_SHOW_SB )
  71     wxFLAGS_MEMBER(wxVSCROLL)
  72     wxFLAGS_MEMBER(wxHSCROLL)
  73
  74     wxFLAGS_MEMBER(wxLB_SINGLE)
  75     wxFLAGS_MEMBER(wxLB_MULTIPLE)
  76     wxFLAGS_MEMBER(wxLB_EXTENDED)
  77     wxFLAGS_MEMBER(wxLB_HSCROLL)
  78     wxFLAGS_MEMBER(wxLB_ALWAYS_SB)
  79     wxFLAGS_MEMBER(wxLB_NEEDED_SB)
  80     wxFLAGS_MEMBER(wxLB_SORT)
  81
  82 wxEND_FLAGS( wxListBoxStyle )
  83
  84 IMPLEMENT_DYNAMIC_CLASS_XTI(wxListBox, wxControlWithItems,"wx/listbox.h")
  85
  86 wxBEGIN_PROPERTIES_TABLE(wxListBox)
  87     wxEVENT_PROPERTY( Select , wxEVT_COMMAND_LISTBOX_SELECTED , wxCommandEvent )
  88     wxEVENT_PROPERTY( DoubleClick , wxEVT_COMMAND_LISTBOX_DOUBLECLICKED , wxCommandEvent )
  89
  90     wxPROPERTY( Font , wxFont , SetFont , GetFont  , EMPTY_MACROVALUE, 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
  91     wxPROPERTY_COLLECTION( Choices , wxArrayString , wxString , AppendString , GetStrings, 0 /*flags*/ , wxT("Helpstring") , wxT("group") )
  92     wxPROPERTY( Selection ,int, SetSelection, GetSelection, EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group") )
  93     wxPROPERTY_FLAGS( WindowStyle , wxListBoxStyle , long , SetWindowStyleFlag , GetWindowStyleFlag , EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group")) // style
  94 wxEND_PROPERTIES_TABLE()
  95
  96 wxBEGIN_HANDLERS_TABLE(wxListBox)
  97 wxEND_HANDLERS_TABLE()
  98
  99 wxCONSTRUCTOR_4( wxListBox , wxWindow* , Parent , wxWindowID , Id , wxPoint , Position , wxSize , Size )
 100 #else
 101 IMPLEMENT_DYNAMIC_CLASS(wxListBox, wxControlWithItems)
 102 #endif
 103
 104 /*
 105 TODO PROPERTIES
 106     selection
 107     content
 108         item
 109 */
 110
 111 // ============================================================================
 112 // list box item declaration and implementation
 113 // ============================================================================
 114
 115 #if wxUSE_OWNER_DRAWN
 116
 117 class wxListBoxItem : public wxOwnerDrawn
 118 {
 119 public:
 120     wxListBoxItem(const wxString& str = wxEmptyString);
 121 };
 122
 123 wxListBoxItem::wxListBoxItem(const wxString& str) : wxOwnerDrawn(str, false)
 124 {
 125     // no bitmaps/checkmarks
 126     SetMarginWidth(0);
 127 }
 128
 129 wxOwnerDrawn *wxListBox::CreateLboxItem(size_t WXUNUSED(n))
 130 {
 131     return new wxListBoxItem();
 132 }
 133
 134 #endif  //USE_OWNER_DRAWN
 135
 136 // ============================================================================
 137 // list box control implementation
 138 // ============================================================================
 139
 140 // ----------------------------------------------------------------------------
 141 // creation
 142 // ----------------------------------------------------------------------------
 143
 144 // Listbox item
 145 wxListBox::wxListBox()
 146 {
 147     m_noItems = 0;
 148     m_updateHorizontalExtent = false;
 149 }
 150
 151 bool wxListBox::Create(wxWindow *parent,
 152                        wxWindowID id,
 153                        const wxPoint& pos,
 154                        const wxSize& size,
 155                        int n, const wxString choices[],
 156                        long style,
 157                        const wxValidator& validator,
 158                        const wxString& name)
 159 {
 160     m_noItems = 0;
 161     m_updateHorizontalExtent = false;
 162
 163     // initialize base class fields
 164     if ( !CreateControl(parent, id, pos, size, style, validator, name) )
 165         return false;
 166
 167     // create the native control
 168     if ( !MSWCreateControl(_T("LISTBOX"), wxEmptyString, pos, size) )
 169     {
 170         // control creation failed
 171         return false;
 172     }
 173
 174     // initialize the contents
 175     for ( int i = 0; i < n; i++ )
 176     {
 177         Append(choices[i]);
 178     }
 179
 180     // now we can compute our best size correctly, so do it again
 181     InvalidateBestSize();
 182     SetInitialSize(size);
 183
 184     return true;
 185 }
 186
 187 bool wxListBox::Create(wxWindow *parent,
 188                        wxWindowID id,
 189                        const wxPoint& pos,
 190                        const wxSize& size,
 191                        const wxArrayString& choices,
 192                        long style,
 193                        const wxValidator& validator,
 194                        const wxString& name)
 195 {
 196     wxCArrayString chs(choices);
 197     return Create(parent, id, pos, size, chs.GetCount(), chs.GetStrings(),
 198                   style, validator, name);
 199 }
 200
 201 wxListBox::~wxListBox()
 202 {
 203     Clear();
 204 }
 205
 206 WXDWORD wxListBox::MSWGetStyle(long style, WXDWORD *exstyle) const
 207 {
 208     WXDWORD msStyle = wxControl::MSWGetStyle(style, exstyle);
 209
 210     // always show the vertical scrollbar if necessary -- otherwise it is
 211     // impossible to use the control with the mouse
 212     msStyle |= WS_VSCROLL;
 213
 214     // we always want to get the notifications
 215     msStyle |= LBS_NOTIFY;
 216
 217     // without this style, you get unexpected heights, so e.g. constraint
 218     // layout doesn't work properly
 219     msStyle |= LBS_NOINTEGRALHEIGHT;
 220
 221     wxASSERT_MSG( !(style & wxLB_MULTIPLE) || !(style & wxLB_EXTENDED),
 222                   _T("only one of listbox selection modes can be specified") );
 223
 224     if ( style & wxLB_MULTIPLE )
 225         msStyle |= LBS_MULTIPLESEL;
 226     else if ( style & wxLB_EXTENDED )
 227         msStyle |= LBS_EXTENDEDSEL;
 228
 229     if ( m_windowStyle & wxLB_ALWAYS_SB )
 230         msStyle |= LBS_DISABLENOSCROLL;
 231     if ( m_windowStyle & wxLB_HSCROLL )
 232         msStyle |= WS_HSCROLL;
 233     if ( m_windowStyle & wxLB_SORT )
 234         msStyle |= LBS_SORT;
 235
 236 #if wxUSE_OWNER_DRAWN && !defined(__WXWINCE__)
 237     if ( m_windowStyle & wxLB_OWNERDRAW )
 238     {
 239         // we don't support LBS_OWNERDRAWVARIABLE yet and we also always put
 240         // the strings in the listbox for simplicity even though we could have
 241         // avoided it in this case
 242         msStyle |= LBS_OWNERDRAWFIXED | LBS_HASSTRINGS;
 243     }
 244 #endif // wxUSE_OWNER_DRAWN
 245
 246     return msStyle;
 247 }
 248
 249 void wxListBox::OnInternalIdle()
 250 {
 251     wxWindow::OnInternalIdle();
 252
 253     if (m_updateHorizontalExtent)
 254     {
 255         SetHorizontalExtent(wxEmptyString);
 256         m_updateHorizontalExtent = false;
 257     }
 258 }
 259
 260 // ----------------------------------------------------------------------------
 261 // implementation of wxListBoxBase methods
 262 // ----------------------------------------------------------------------------
 263
 264 void wxListBox::DoSetFirstItem(int N)
 265 {
 266     wxCHECK_RET( IsValid(N),
 267                  wxT("invalid index in wxListBox::SetFirstItem") );
 268
 269     SendMessage(GetHwnd(), LB_SETTOPINDEX, (WPARAM)N, (LPARAM)0);
 270 }
 271
 272 void wxListBox::DoDeleteOneItem(unsigned int n)
 273 {
 274     wxCHECK_RET( IsValid(n),
 275                  wxT("invalid index in wxListBox::Delete") );
 276
 277     SendMessage(GetHwnd(), LB_DELETESTRING, n, 0);
 278     m_noItems--;
 279
 280     // SetHorizontalExtent(wxEmptyString); can be slow
 281     m_updateHorizontalExtent = true;
 282
 283     UpdateOldSelections();
 284 }
 285
 286 int wxListBox::FindString(const wxString& s, bool bCase) const
 287 {
 288     // back to base class search for not native search type
 289     if (bCase)
 290        return wxItemContainerImmutable::FindString( s, bCase );
 291
 292     int pos = ListBox_FindStringExact(GetHwnd(), -1, s.wx_str());
 293     if (pos == LB_ERR)
 294         return wxNOT_FOUND;
 295     else
 296         return pos;
 297 }
 298
 299 void wxListBox::DoClear()
 300 {
 301     Free();
 302
 303     ListBox_ResetContent(GetHwnd());
 304
 305     m_noItems = 0;
 306     m_updateHorizontalExtent = true;
 307
 308     UpdateOldSelections();
 309 }
 310
 311 void wxListBox::Free()
 312 {
 313 #if wxUSE_OWNER_DRAWN
 314     if ( m_windowStyle & wxLB_OWNERDRAW )
 315     {
 316         WX_CLEAR_ARRAY(m_aItems);
 317     }
 318 #endif // wxUSE_OWNER_DRAWN
 319 }
 320
 321 void wxListBox::DoSetSelection(int N, bool select)
 322 {
 323     wxCHECK_RET( N == wxNOT_FOUND || IsValid(N),
 324                  wxT("invalid index in wxListBox::SetSelection") );
 325
 326     if ( HasMultipleSelection() )
 327     {
 328         SendMessage(GetHwnd(), LB_SETSEL, select, N);
 329     }
 330     else
 331     {
 332         SendMessage(GetHwnd(), LB_SETCURSEL, select ? N : -1, 0);
 333     }
 334
 335     UpdateOldSelections();
 336 }
 337
 338 bool wxListBox::IsSelected(int N) const
 339 {
 340     wxCHECK_MSG( IsValid(N), false,
 341                  wxT("invalid index in wxListBox::Selected") );
 342
 343     return SendMessage(GetHwnd(), LB_GETSEL, N, 0) == 0 ? false : true;
 344 }
 345
 346 void *wxListBox::DoGetItemClientData(unsigned int n) const
 347 {
 348     wxCHECK_MSG( IsValid(n), NULL,
 349                  wxT("invalid index in wxListBox::GetClientData") );
 350
 351     return (void *)SendMessage(GetHwnd(), LB_GETITEMDATA, n, 0);
 352 }
 353
 354 void wxListBox::DoSetItemClientData(unsigned int n, void *clientData)
 355 {
 356     wxCHECK_RET( IsValid(n),
 357                  wxT("invalid index in wxListBox::SetClientData") );
 358
 359     if ( ListBox_SetItemData(GetHwnd(), n, clientData) == LB_ERR )
 360         wxLogDebug(wxT("LB_SETITEMDATA failed"));
 361 }
 362
 363 // Return number of selections and an array of selected integers
 364 int wxListBox::GetSelections(wxArrayInt& aSelections) const
 365 {
 366     aSelections.Empty();
 367
 368     if ( HasMultipleSelection() )
 369     {
 370         int countSel = ListBox_GetSelCount(GetHwnd());
 371         if ( countSel == LB_ERR )
 372         {
 373             wxLogDebug(_T("ListBox_GetSelCount failed"));
 374         }
 375         else if ( countSel != 0 )
 376         {
 377             int *selections = new int[countSel];
 378
 379             if ( ListBox_GetSelItems(GetHwnd(),
 380                                      countSel, selections) == LB_ERR )
 381             {
 382                 wxLogDebug(wxT("ListBox_GetSelItems failed"));
 383                 countSel = -1;
 384             }
 385             else
 386             {
 387                 aSelections.Alloc(countSel);
 388                 for ( int n = 0; n < countSel; n++ )
 389                     aSelections.Add(selections[n]);
 390             }
 391
 392             delete [] selections;
 393         }
 394
 395         return countSel;
 396     }
 397     else  // single-selection listbox
 398     {
 399         if (ListBox_GetCurSel(GetHwnd()) > -1)
 400             aSelections.Add(ListBox_GetCurSel(GetHwnd()));
 401
 402         return aSelections.Count();
 403     }
 404 }
 405
 406 // Get single selection, for single choice list items
 407 int wxListBox::GetSelection() const
 408 {
 409     wxCHECK_MSG( !HasMultipleSelection(),
 410                  -1,
 411                  wxT("GetSelection() can't be used with multiple-selection listboxes, use GetSelections() instead.") );
 412
 413     return ListBox_GetCurSel(GetHwnd());
 414 }
 415
 416 // Find string for position
 417 wxString wxListBox::GetString(unsigned int n) const
 418 {
 419     wxCHECK_MSG( IsValid(n), wxEmptyString,
 420                  wxT("invalid index in wxListBox::GetString") );
 421
 422     int len = ListBox_GetTextLen(GetHwnd(), n);
 423
 424     // +1 for terminating NUL
 425     wxString result;
 426     ListBox_GetText(GetHwnd(), n, (wxChar*)wxStringBuffer(result, len + 1));
 427
 428     return result;
 429 }
 430
 431 int wxListBox::DoInsertItems(const wxArrayStringsAdapter & items,
 432                              unsigned int pos,
 433                              void **clientData,
 434                              wxClientDataType type)
 435 {
 436     MSWAllocStorage(items, LB_INITSTORAGE);
 437
 438     const bool append = pos == GetCount();
 439
 440     // we must use CB_ADDSTRING when appending as only it works correctly for
 441     // the sorted controls
 442     const unsigned msg = append ? LB_ADDSTRING : LB_INSERTSTRING;
 443
 444     if ( append )
 445         pos = 0;
 446
 447     int n = wxNOT_FOUND;
 448
 449     const unsigned int numItems = items.GetCount();
 450     for ( unsigned int i = 0; i < numItems; i++ )
 451     {
 452         n = MSWInsertOrAppendItem(pos, items[i], msg);
 453         if ( n == wxNOT_FOUND )
 454             return n;
 455
 456         if ( !append )
 457             pos++;
 458
 459         ++m_noItems;
 460
 461 #if wxUSE_OWNER_DRAWN
 462         if ( HasFlag(wxLB_OWNERDRAW) )
 463         {
 464             wxOwnerDrawn *pNewItem = CreateLboxItem(n);
 465             pNewItem->SetName(items[i]);
 466             pNewItem->SetFont(GetFont());
 467             m_aItems.Insert(pNewItem, n);
 468         }
 469 #endif // wxUSE_OWNER_DRAWN
 470         AssignNewItemClientData(n, clientData, i, type);
 471     }
 472
 473     m_updateHorizontalExtent = true;
 474
 475     UpdateOldSelections();
 476
 477     return n;
 478 }
 479
 480 int wxListBox::DoListHitTest(const wxPoint& point) const
 481 {
 482     LRESULT lRes =  ::SendMessage(GetHwnd(), LB_ITEMFROMPOINT,
 483                                   0L, MAKELONG(point.x, point.y));
 484
 485     // non zero high-order word means that this item is outside of the client
 486     // area, IOW the point is outside of the listbox
 487     return HIWORD(lRes) ? wxNOT_FOUND : lRes;
 488 }
 489
 490 void wxListBox::SetString(unsigned int n, const wxString& s)
 491 {
 492     wxCHECK_RET( IsValid(n),
 493                  wxT("invalid index in wxListBox::SetString") );
 494
 495     // remember the state of the item
 496     bool wasSelected = IsSelected(n);
 497
 498     void *oldData = NULL;
 499     wxClientData *oldObjData = NULL;
 500     if ( HasClientUntypedData() )
 501         oldData = GetClientData(n);
 502     else if ( HasClientObjectData() )
 503         oldObjData = GetClientObject(n);
 504
 505     // delete and recreate it
 506     SendMessage(GetHwnd(), LB_DELETESTRING, n, 0);
 507
 508     int newN = n;
 509     if ( n == (m_noItems - 1) )
 510         newN = -1;
 511
 512     ListBox_InsertString(GetHwnd(), newN, s.wx_str());
 513
 514     // restore the client data
 515     if ( oldData )
 516         SetClientData(n, oldData);
 517     else if ( oldObjData )
 518         SetClientObject(n, oldObjData);
 519
 520 #if wxUSE_OWNER_DRAWN
 521     if ( m_windowStyle & wxLB_OWNERDRAW )
 522     {
 523         // update item's text
 524         m_aItems[n]->SetName(s);
 525     }
 526 #endif  //USE_OWNER_DRAWN
 527
 528     // we may have lost the selection
 529     if ( wasSelected )
 530         Select(n);
 531
 532     m_updateHorizontalExtent = true;
 533 }
 534
 535 unsigned int wxListBox::GetCount() const
 536 {
 537     return m_noItems;
 538 }
 539
 540 // ----------------------------------------------------------------------------
 541 // size-related stuff
 542 // ----------------------------------------------------------------------------
 543
 544 void wxListBox::SetHorizontalExtent(const wxString& s)
 545 {
 546     // in any case, our best size could have changed
 547     InvalidateBestSize();
 548
 549     // the rest is only necessary if we want a horizontal scrollbar
 550     if ( !HasFlag(wxHSCROLL) )
 551         return;
 552
 553
 554     WindowHDC dc(GetHwnd());
 555     SelectInHDC selFont(dc, GetHfontOf(GetFont()));
 556
 557     TEXTMETRIC lpTextMetric;
 558     ::GetTextMetrics(dc, &lpTextMetric);
 559
 560     int largestExtent = 0;
 561     SIZE extentXY;
 562
 563     if ( s.empty() )
 564     {
 565         // set extent to the max length of all strings
 566         for ( unsigned int i = 0; i < m_noItems; i++ )
 567         {
 568             const wxString str = GetString(i);
 569             ::GetTextExtentPoint32(dc, str.c_str(), str.length(), &extentXY);
 570
 571             int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 572             if ( extentX > largestExtent )
 573                 largestExtent = extentX;
 574         }
 575     }
 576     else // just increase the extent to the length of this string
 577     {
 578         int existingExtent = (int)SendMessage(GetHwnd(),
 579                                               LB_GETHORIZONTALEXTENT, 0, 0L);
 580
 581         ::GetTextExtentPoint32(dc, s.c_str(), s.length(), &extentXY);
 582
 583         int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 584         if ( extentX > existingExtent )
 585             largestExtent = extentX;
 586     }
 587
 588     if ( largestExtent )
 589         SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(largestExtent), 0L);
 590     //else: it shouldn't change
 591 }
 592
 593 wxSize wxListBox::DoGetBestSize() const
 594 {
 595     // find the widest string
 596     int wLine;
 597     int wListbox = 0;
 598     for (unsigned int i = 0; i < m_noItems; i++)
 599     {
 600         wxString str(GetString(i));
 601         GetTextExtent(str, &wLine, NULL);
 602         if ( wLine > wListbox )
 603             wListbox = wLine;
 604     }
 605
 606     // give it some reasonable default value if there are no strings in the
 607     // list
 608     if ( wListbox == 0 )
 609         wListbox = 100;
 610
 611     // the listbox should be slightly larger than the widest string
 612     int cx, cy;
 613     wxGetCharSize(GetHWND(), &cx, &cy, GetFont());
 614
 615     wListbox += 3*cx;
 616
 617     // Add room for the scrollbar
 618     wListbox += wxSystemSettings::GetMetric(wxSYS_VSCROLL_X);
 619
 620     // don't make the listbox too tall (limit height to 10 items) but don't
 621     // make it too small neither
 622     int hListbox = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy)*
 623                     wxMin(wxMax(m_noItems, 3), 10);
 624
 625     wxSize best(wListbox, hListbox);
 626     CacheBestSize(best);
 627     return best;
 628 }
 629
 630 // ----------------------------------------------------------------------------
 631 // callbacks
 632 // ----------------------------------------------------------------------------
 633
 634 bool wxListBox::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 635 {
 636     if ((param == LBN_SELCHANGE) && HasMultipleSelection())
 637     {
 638         CalcAndSendEvent();
 639         return true;
 640     }
 641
 642     wxEventType evtType;
 643     if ( param == LBN_SELCHANGE )
 644     {
 645         evtType = wxEVT_COMMAND_LISTBOX_SELECTED;
 646     }
 647     else if ( param == LBN_DBLCLK )
 648     {
 649         evtType = wxEVT_COMMAND_LISTBOX_DOUBLECLICKED;
 650     }
 651     else
 652     {
 653         // some event we're not interested in
 654         return false;
 655     }
 656
 657     wxCommandEvent event(evtType, m_windowId);
 658     event.SetEventObject( this );
 659
 660     // retrieve the affected item
 661     int n = SendMessage(GetHwnd(), LB_GETCARETINDEX, 0, 0);
 662     if ( n != LB_ERR )
 663     {
 664         if ( HasClientObjectData() )
 665             event.SetClientObject( GetClientObject(n) );
 666         else if ( HasClientUntypedData() )
 667             event.SetClientData( GetClientData(n) );
 668
 669         event.SetString(GetString(n));
 670     }
 671     else
 672     {
 673         return false;
 674     }
 675
 676     event.SetInt(n);
 677
 678     return HandleWindowEvent(event);
 679 }
 680
 681 // ----------------------------------------------------------------------------
 682 // wxCheckListBox support
 683 // ----------------------------------------------------------------------------
 684
 685 #if wxUSE_OWNER_DRAWN
 686
 687 // drawing
 688 // -------
 689
 690 // space beneath/above each row in pixels
 691 // "standard" checklistbox use 1 here, some might prefer 2. 0 is ugly.
 692 #define OWNER_DRAWN_LISTBOX_EXTRA_SPACE    (1)
 693
 694 // the height is the same for all items
 695 // TODO should be changed for LBS_OWNERDRAWVARIABLE style listboxes
 696
 697 // NB: can't forward this to wxListBoxItem because LB_SETITEMDATA
 698 //     message is not yet sent when we get here!
 699 bool wxListBox::MSWOnMeasure(WXMEASUREITEMSTRUCT *item)
 700 {
 701     // only owner-drawn control should receive this message
 702     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), false );
 703
 704     MEASUREITEMSTRUCT *pStruct = (MEASUREITEMSTRUCT *)item;
 705
 706 #ifdef __WXWINCE__
 707     HDC hdc = GetDC(NULL);
 708 #else
 709     HDC hdc = CreateIC(wxT("DISPLAY"), NULL, NULL, 0);
 710 #endif
 711
 712     {
 713         wxDCTemp dc((WXHDC)hdc);
 714         dc.SetFont(GetFont());
 715
 716         pStruct->itemHeight = dc.GetCharHeight() + 2*OWNER_DRAWN_LISTBOX_EXTRA_SPACE;
 717         pStruct->itemWidth  = dc.GetCharWidth();
 718     }
 719
 720 #ifdef __WXWINCE__
 721     ReleaseDC(NULL, hdc);
 722 #else
 723     DeleteDC(hdc);
 724 #endif
 725
 726     return true;
 727 }
 728
 729 // forward the message to the appropriate item
 730 bool wxListBox::MSWOnDraw(WXDRAWITEMSTRUCT *item)
 731 {
 732     // only owner-drawn control should receive this message
 733     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), false );
 734
 735     DRAWITEMSTRUCT *pStruct = (DRAWITEMSTRUCT *)item;
 736
 737     // the item may be -1 for an empty listbox
 738     if ( pStruct->itemID == (UINT)-1 )
 739         return false;
 740
 741     wxListBoxItem *pItem = (wxListBoxItem *)m_aItems[pStruct->itemID];
 742
 743     wxDCTemp dc((WXHDC)pStruct->hDC);
 744     wxPoint pt1(pStruct->rcItem.left, pStruct->rcItem.top);
 745     wxPoint pt2(pStruct->rcItem.right, pStruct->rcItem.bottom);
 746     wxRect rect(pt1, pt2);
 747
 748     return pItem->OnDrawItem(dc, rect,
 749                              (wxOwnerDrawn::wxODAction)pStruct->itemAction,
 750                              (wxOwnerDrawn::wxODStatus)pStruct->itemState);
 751 }
 752
 753 #endif // wxUSE_OWNER_DRAWN
 754
 755 #endif // wxUSE_LISTBOX