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_selected = 0;
 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_selected = 0;
 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 if necessary
 181     SetInitialSize(size);
 182
 183     return true;
 184 }
 185
 186 bool wxListBox::Create(wxWindow *parent,
 187                        wxWindowID id,
 188                        const wxPoint& pos,
 189                        const wxSize& size,
 190                        const wxArrayString& choices,
 191                        long style,
 192                        const wxValidator& validator,
 193                        const wxString& name)
 194 {
 195     wxCArrayString chs(choices);
 196     return Create(parent, id, pos, size, chs.GetCount(), chs.GetStrings(),
 197                   style, validator, name);
 198 }
 199
 200 wxListBox::~wxListBox()
 201 {
 202     Clear();
 203 }
 204
 205 WXDWORD wxListBox::MSWGetStyle(long style, WXDWORD *exstyle) const
 206 {
 207     WXDWORD msStyle = wxControl::MSWGetStyle(style, exstyle);
 208
 209     // always show the vertical scrollbar if necessary -- otherwise it is
 210     // impossible to use the control with the mouse
 211     msStyle |= WS_VSCROLL;
 212
 213     // we always want to get the notifications
 214     msStyle |= LBS_NOTIFY;
 215
 216     // without this style, you get unexpected heights, so e.g. constraint
 217     // layout doesn't work properly
 218     msStyle |= LBS_NOINTEGRALHEIGHT;
 219
 220     wxASSERT_MSG( !(style & wxLB_MULTIPLE) || !(style & wxLB_EXTENDED),
 221                   _T("only one of listbox selection modes can be specified") );
 222
 223     if ( style & wxLB_MULTIPLE )
 224         msStyle |= LBS_MULTIPLESEL;
 225     else if ( style & wxLB_EXTENDED )
 226         msStyle |= LBS_EXTENDEDSEL;
 227
 228     if ( m_windowStyle & wxLB_ALWAYS_SB )
 229         msStyle |= LBS_DISABLENOSCROLL;
 230     if ( m_windowStyle & wxLB_HSCROLL )
 231         msStyle |= WS_HSCROLL;
 232     if ( m_windowStyle & wxLB_SORT )
 233         msStyle |= LBS_SORT;
 234
 235 #if wxUSE_OWNER_DRAWN && !defined(__WXWINCE__)
 236     if ( m_windowStyle & wxLB_OWNERDRAW )
 237     {
 238         // we don't support LBS_OWNERDRAWVARIABLE yet and we also always put
 239         // the strings in the listbox for simplicity even though we could have
 240         // avoided it in this case
 241         msStyle |= LBS_OWNERDRAWFIXED | LBS_HASSTRINGS;
 242     }
 243 #endif // wxUSE_OWNER_DRAWN
 244
 245     return msStyle;
 246 }
 247
 248 // ----------------------------------------------------------------------------
 249 // implementation of wxListBoxBase methods
 250 // ----------------------------------------------------------------------------
 251
 252 void wxListBox::DoSetFirstItem(int N)
 253 {
 254     wxCHECK_RET( IsValid(N),
 255                  wxT("invalid index in wxListBox::SetFirstItem") );
 256
 257     SendMessage(GetHwnd(), LB_SETTOPINDEX, (WPARAM)N, (LPARAM)0);
 258 }
 259
 260 void wxListBox::DoDeleteOneItem(unsigned int n)
 261 {
 262     wxCHECK_RET( IsValid(n),
 263                  wxT("invalid index in wxListBox::Delete") );
 264
 265     SendMessage(GetHwnd(), LB_DELETESTRING, n, 0);
 266     m_noItems--;
 267
 268     SetHorizontalExtent(wxEmptyString);
 269
 270     UpdateOldSelections();
 271 }
 272
 273 int wxListBox::FindString(const wxString& s, bool bCase) const
 274 {
 275     // back to base class search for not native search type
 276     if (bCase)
 277        return wxItemContainerImmutable::FindString( s, bCase );
 278
 279     int pos = ListBox_FindStringExact(GetHwnd(), -1, s.wx_str());
 280     if (pos == LB_ERR)
 281         return wxNOT_FOUND;
 282     else
 283         return pos;
 284 }
 285
 286 void wxListBox::DoClear()
 287 {
 288     Free();
 289
 290     ListBox_ResetContent(GetHwnd());
 291
 292     m_noItems = 0;
 293     SetHorizontalExtent();
 294
 295     UpdateOldSelections();
 296 }
 297
 298 void wxListBox::Free()
 299 {
 300 #if wxUSE_OWNER_DRAWN
 301     if ( m_windowStyle & wxLB_OWNERDRAW )
 302     {
 303         WX_CLEAR_ARRAY(m_aItems);
 304     }
 305 #endif // wxUSE_OWNER_DRAWN
 306 }
 307
 308 void wxListBox::DoSetSelection(int N, bool select)
 309 {
 310     wxCHECK_RET( N == wxNOT_FOUND || IsValid(N),
 311                  wxT("invalid index in wxListBox::SetSelection") );
 312
 313     if ( HasMultipleSelection() )
 314     {
 315         SendMessage(GetHwnd(), LB_SETSEL, select, N);
 316     }
 317     else
 318     {
 319         SendMessage(GetHwnd(), LB_SETCURSEL, select ? N : -1, 0);
 320     }
 321
 322     UpdateOldSelections();
 323 }
 324
 325 bool wxListBox::IsSelected(int N) const
 326 {
 327     wxCHECK_MSG( IsValid(N), false,
 328                  wxT("invalid index in wxListBox::Selected") );
 329
 330     return SendMessage(GetHwnd(), LB_GETSEL, N, 0) == 0 ? false : true;
 331 }
 332
 333 void *wxListBox::DoGetItemClientData(unsigned int n) const
 334 {
 335     wxCHECK_MSG( IsValid(n), NULL,
 336                  wxT("invalid index in wxListBox::GetClientData") );
 337
 338     return (void *)SendMessage(GetHwnd(), LB_GETITEMDATA, n, 0);
 339 }
 340
 341 void wxListBox::DoSetItemClientData(unsigned int n, void *clientData)
 342 {
 343     wxCHECK_RET( IsValid(n),
 344                  wxT("invalid index in wxListBox::SetClientData") );
 345
 346 #if wxUSE_OWNER_DRAWN
 347     if ( m_windowStyle & wxLB_OWNERDRAW )
 348     {
 349         // client data must be pointer to wxOwnerDrawn, otherwise we would crash
 350         // in OnMeasure/OnDraw.
 351         wxFAIL_MSG(wxT("Can't use client data with owner-drawn listboxes"));
 352     }
 353 #endif // wxUSE_OWNER_DRAWN
 354
 355     if ( ListBox_SetItemData(GetHwnd(), n, clientData) == LB_ERR )
 356         wxLogDebug(wxT("LB_SETITEMDATA failed"));
 357 }
 358
 359 // Return number of selections and an array of selected integers
 360 int wxListBox::GetSelections(wxArrayInt& aSelections) const
 361 {
 362     aSelections.Empty();
 363
 364     if ( HasMultipleSelection() )
 365     {
 366         int countSel = ListBox_GetSelCount(GetHwnd());
 367         if ( countSel == LB_ERR )
 368         {
 369             wxLogDebug(_T("ListBox_GetSelCount failed"));
 370         }
 371         else if ( countSel != 0 )
 372         {
 373             int *selections = new int[countSel];
 374
 375             if ( ListBox_GetSelItems(GetHwnd(),
 376                                      countSel, selections) == LB_ERR )
 377             {
 378                 wxLogDebug(wxT("ListBox_GetSelItems failed"));
 379                 countSel = -1;
 380             }
 381             else
 382             {
 383                 aSelections.Alloc(countSel);
 384                 for ( int n = 0; n < countSel; n++ )
 385                     aSelections.Add(selections[n]);
 386             }
 387
 388             delete [] selections;
 389         }
 390
 391         return countSel;
 392     }
 393     else  // single-selection listbox
 394     {
 395         if (ListBox_GetCurSel(GetHwnd()) > -1)
 396             aSelections.Add(ListBox_GetCurSel(GetHwnd()));
 397
 398         return aSelections.Count();
 399     }
 400 }
 401
 402 // Get single selection, for single choice list items
 403 int wxListBox::GetSelection() const
 404 {
 405     wxCHECK_MSG( !HasMultipleSelection(),
 406                  -1,
 407                  wxT("GetSelection() can't be used with multiple-selection listboxes, use GetSelections() instead.") );
 408
 409     return ListBox_GetCurSel(GetHwnd());
 410 }
 411
 412 // Find string for position
 413 wxString wxListBox::GetString(unsigned int n) const
 414 {
 415     wxCHECK_MSG( IsValid(n), wxEmptyString,
 416                  wxT("invalid index in wxListBox::GetString") );
 417
 418     int len = ListBox_GetTextLen(GetHwnd(), n);
 419
 420     // +1 for terminating NUL
 421     wxString result;
 422     ListBox_GetText(GetHwnd(), n, (wxChar*)wxStringBuffer(result, len + 1));
 423
 424     return result;
 425 }
 426
 427 int wxListBox::DoInsertItems(const wxArrayStringsAdapter & items,
 428                              unsigned int pos,
 429                              void **clientData,
 430                              wxClientDataType type)
 431 {
 432     MSWAllocStorage(items, LB_INITSTORAGE);
 433
 434     const bool append = pos == GetCount();
 435
 436     // we must use CB_ADDSTRING when appending as only it works correctly for
 437     // the sorted controls
 438     const unsigned msg = append ? LB_ADDSTRING : LB_INSERTSTRING;
 439
 440     if ( append )
 441         pos = 0;
 442
 443     int n = wxNOT_FOUND;
 444
 445     const unsigned int numItems = items.GetCount();
 446     for ( unsigned int i = 0; i < numItems; i++ )
 447     {
 448         n = MSWInsertOrAppendItem(pos, items[i], msg);
 449         if ( n == wxNOT_FOUND )
 450             return n;
 451
 452         if ( !append )
 453             pos++;
 454
 455         ++m_noItems;
 456
 457 #if wxUSE_OWNER_DRAWN
 458         if ( HasFlag(wxLB_OWNERDRAW) )
 459         {
 460             wxOwnerDrawn *pNewItem = CreateLboxItem(n);
 461             pNewItem->SetName(items[i]);
 462             pNewItem->SetFont(GetFont());
 463             m_aItems.Insert(pNewItem, n);
 464
 465             ListBox_SetItemData(GetHwnd(), n, pNewItem);
 466         }
 467 #endif // wxUSE_OWNER_DRAWN
 468         AssignNewItemClientData(n, clientData, i, type);
 469     }
 470
 471     SetHorizontalExtent();
 472
 473     UpdateOldSelections();
 474
 475     return n;
 476 }
 477
 478 int wxListBox::DoListHitTest(const wxPoint& point) const
 479 {
 480     LRESULT lRes =  ::SendMessage(GetHwnd(), LB_ITEMFROMPOINT,
 481                                   0L, MAKELONG(point.x, point.y));
 482
 483     // non zero high-order word means that this item is outside of the client
 484     // area, IOW the point is outside of the listbox
 485     return HIWORD(lRes) ? wxNOT_FOUND : lRes;
 486 }
 487
 488 void wxListBox::SetString(unsigned int n, const wxString& s)
 489 {
 490     wxCHECK_RET( IsValid(n),
 491                  wxT("invalid index in wxListBox::SetString") );
 492
 493     // remember the state of the item
 494     bool wasSelected = IsSelected(n);
 495
 496     void *oldData = NULL;
 497     wxClientData *oldObjData = NULL;
 498     if ( HasClientUntypedData() )
 499         oldData = GetClientData(n);
 500     else if ( HasClientObjectData() )
 501         oldObjData = GetClientObject(n);
 502
 503     // delete and recreate it
 504     SendMessage(GetHwnd(), LB_DELETESTRING, n, 0);
 505
 506     int newN = n;
 507     if ( n == (m_noItems - 1) )
 508         newN = -1;
 509
 510     ListBox_InsertString(GetHwnd(), newN, s.wx_str());
 511
 512     // restore the client data
 513     if ( oldData )
 514         SetClientData(n, oldData);
 515     else if ( oldObjData )
 516         SetClientObject(n, oldObjData);
 517
 518 #if wxUSE_OWNER_DRAWN
 519     if ( m_windowStyle & wxLB_OWNERDRAW )
 520     {
 521         // update item's text
 522         m_aItems[n]->SetName(s);
 523
 524         // reassign the item's data
 525         ListBox_SetItemData(GetHwnd(), n, m_aItems[n]);
 526     }
 527 #endif  //USE_OWNER_DRAWN
 528
 529     // we may have lost the selection
 530     if ( wasSelected )
 531         Select(n);
 532
 533     SetHorizontalExtent();
 534 }
 535
 536 unsigned int wxListBox::GetCount() const
 537 {
 538     return m_noItems;
 539 }
 540
 541 // ----------------------------------------------------------------------------
 542 // size-related stuff
 543 // ----------------------------------------------------------------------------
 544
 545 void wxListBox::SetHorizontalExtent(const wxString& s)
 546 {
 547     // in any case, our best size could have changed
 548     InvalidateBestSize();
 549
 550     // the rest is only necessary if we want a horizontal scrollbar
 551     if ( !HasFlag(wxHSCROLL) )
 552         return;
 553
 554
 555     WindowHDC dc(GetHwnd());
 556     SelectInHDC selFont(dc, GetHfontOf(GetFont()));
 557
 558     TEXTMETRIC lpTextMetric;
 559     ::GetTextMetrics(dc, &lpTextMetric);
 560
 561     int largestExtent = 0;
 562     SIZE extentXY;
 563
 564     if ( s.empty() )
 565     {
 566         // set extent to the max length of all strings
 567         for ( unsigned int i = 0; i < m_noItems; i++ )
 568         {
 569             const wxString str = GetString(i);
 570             ::GetTextExtentPoint32(dc, str.c_str(), str.length(), &extentXY);
 571
 572             int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 573             if ( extentX > largestExtent )
 574                 largestExtent = extentX;
 575         }
 576     }
 577     else // just increase the extent to the length of this string
 578     {
 579         int existingExtent = (int)SendMessage(GetHwnd(),
 580                                               LB_GETHORIZONTALEXTENT, 0, 0L);
 581
 582         ::GetTextExtentPoint32(dc, s.c_str(), s.length(), &extentXY);
 583
 584         int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 585         if ( extentX > existingExtent )
 586             largestExtent = extentX;
 587     }
 588
 589     if ( largestExtent )
 590         SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(largestExtent), 0L);
 591     //else: it shouldn't change
 592 }
 593
 594 wxSize wxListBox::DoGetBestSize() const
 595 {
 596     // find the widest string
 597     int wLine;
 598     int wListbox = 0;
 599     for (unsigned int i = 0; i < m_noItems; i++)
 600     {
 601         wxString str(GetString(i));
 602         GetTextExtent(str, &wLine, NULL);
 603         if ( wLine > wListbox )
 604             wListbox = wLine;
 605     }
 606
 607     // give it some reasonable default value if there are no strings in the
 608     // list
 609     if ( wListbox == 0 )
 610         wListbox = 100;
 611
 612     // the listbox should be slightly larger than the widest string
 613     int cx, cy;
 614     wxGetCharSize(GetHWND(), &cx, &cy, GetFont());
 615
 616     wListbox += 3*cx;
 617
 618     // Add room for the scrollbar
 619     wListbox += wxSystemSettings::GetMetric(wxSYS_VSCROLL_X);
 620
 621     // don't make the listbox too tall (limit height to 10 items) but don't
 622     // make it too small neither
 623     int hListbox = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy)*
 624                     wxMin(wxMax(m_noItems, 3), 10);
 625
 626     wxSize best(wListbox, hListbox);
 627     CacheBestSize(best);
 628     return best;
 629 }
 630
 631 // ----------------------------------------------------------------------------
 632 // callbacks
 633 // ----------------------------------------------------------------------------
 634
 635 bool wxListBox::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 636 {
 637     if ((param == LBN_SELCHANGE) && HasMultipleSelection())
 638     {
 639         CalcAndSendEvent();
 640         return true;
 641     }
 642
 643     wxEventType evtType;
 644     if ( param == LBN_SELCHANGE )
 645     {
 646         evtType = wxEVT_COMMAND_LISTBOX_SELECTED;
 647     }
 648     else if ( param == LBN_DBLCLK )
 649     {
 650         evtType = wxEVT_COMMAND_LISTBOX_DOUBLECLICKED;
 651     }
 652     else
 653     {
 654         // some event we're not interested in
 655         return false;
 656     }
 657
 658     wxCommandEvent event(evtType, m_windowId);
 659     event.SetEventObject( this );
 660
 661     // retrieve the affected item
 662     int n = SendMessage(GetHwnd(), LB_GETCARETINDEX, 0, 0);
 663     if ( n != LB_ERR )
 664     {
 665         if ( HasClientObjectData() )
 666             event.SetClientObject( GetClientObject(n) );
 667         else if ( HasClientUntypedData() )
 668             event.SetClientData( GetClientData(n) );
 669
 670         event.SetString(GetString(n));
 671     }
 672     else
 673     {
 674         return false;
 675     }
 676
 677     event.SetInt(n);
 678
 679     return HandleWindowEvent(event);
 680 }
 681
 682 // ----------------------------------------------------------------------------
 683 // wxCheckListBox support
 684 // ----------------------------------------------------------------------------
 685
 686 #if wxUSE_OWNER_DRAWN
 687
 688 // drawing
 689 // -------
 690
 691 // space beneath/above each row in pixels
 692 // "standard" checklistbox use 1 here, some might prefer 2. 0 is ugly.
 693 #define OWNER_DRAWN_LISTBOX_EXTRA_SPACE    (1)
 694
 695 // the height is the same for all items
 696 // TODO should be changed for LBS_OWNERDRAWVARIABLE style listboxes
 697
 698 // NB: can't forward this to wxListBoxItem because LB_SETITEMDATA
 699 //     message is not yet sent when we get here!
 700 bool wxListBox::MSWOnMeasure(WXMEASUREITEMSTRUCT *item)
 701 {
 702     // only owner-drawn control should receive this message
 703     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), false );
 704
 705     MEASUREITEMSTRUCT *pStruct = (MEASUREITEMSTRUCT *)item;
 706
 707 #ifdef __WXWINCE__
 708     HDC hdc = GetDC(NULL);
 709 #else
 710     HDC hdc = CreateIC(wxT("DISPLAY"), NULL, NULL, 0);
 711 #endif
 712
 713     {
 714         wxDCTemp dc((WXHDC)hdc);
 715         dc.SetFont(GetFont());
 716
 717         pStruct->itemHeight = dc.GetCharHeight() + 2*OWNER_DRAWN_LISTBOX_EXTRA_SPACE;
 718         pStruct->itemWidth  = dc.GetCharWidth();
 719     }
 720
 721 #ifdef __WXWINCE__
 722     ReleaseDC(NULL, hdc);
 723 #else
 724     DeleteDC(hdc);
 725 #endif
 726
 727     return true;
 728 }
 729
 730 // forward the message to the appropriate item
 731 bool wxListBox::MSWOnDraw(WXDRAWITEMSTRUCT *item)
 732 {
 733     // only owner-drawn control should receive this message
 734     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), false );
 735
 736     DRAWITEMSTRUCT *pStruct = (DRAWITEMSTRUCT *)item;
 737     UINT itemID = pStruct->itemID;
 738
 739     // the item may be -1 for an empty listbox
 740     if ( itemID == (UINT)-1 )
 741         return false;
 742
 743     LRESULT data = ListBox_GetItemData(GetHwnd(), pStruct->itemID);
 744
 745     wxCHECK( data && (data != LB_ERR), false );
 746
 747     wxListBoxItem *pItem = (wxListBoxItem *)data;
 748
 749     wxDCTemp dc((WXHDC)pStruct->hDC);
 750     wxPoint pt1(pStruct->rcItem.left, pStruct->rcItem.top);
 751     wxPoint pt2(pStruct->rcItem.right, pStruct->rcItem.bottom);
 752     wxRect rect(pt1, pt2);
 753
 754     return pItem->OnDrawItem(dc, rect,
 755                              (wxOwnerDrawn::wxODAction)pStruct->itemAction,
 756                              (wxOwnerDrawn::wxODStatus)pStruct->itemState);
 757 }
 758
 759 #endif // wxUSE_OWNER_DRAWN
 760
 761 #endif // wxUSE_LISTBOX