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