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