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