src/msw/listbox.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/msw/listbox.cpp
   3 // Purpose:     wxListBox
   4 // Author:      Julian Smart
   5 // Modified by: Vadim Zeitlin (owner drawn stuff)
   6 // Created:
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart
   9 // Licence:     wxWindows licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 // For compilers that support precompilation, includes "wx.h".
  13 #include "wx/wxprec.h"
  14
  15 #ifdef __BORLANDC__
  16     #pragma hdrstop
  17 #endif
  18
  19 #if wxUSE_LISTBOX
  20
  21 #include "wx/listbox.h"
  22
  23 #ifndef WX_PRECOMP
  24     #include "wx/dynarray.h"
  25     #include "wx/settings.h"
  26     #include "wx/brush.h"
  27     #include "wx/font.h"
  28     #include "wx/dc.h"
  29     #include "wx/utils.h"
  30     #include "wx/log.h"
  31     #include "wx/window.h"
  32 #endif
  33
  34 #include "wx/msw/private.h"
  35 #include "wx/msw/dc.h"
  36
  37 #include <windowsx.h>
  38
  39 #if wxUSE_OWNER_DRAWN
  40     #include  "wx/ownerdrw.h"
  41 #endif
  42
  43 #if wxUSE_EXTENDED_RTTI
  44 WX_DEFINE_FLAGS( wxListBoxStyle )
  45
  46 wxBEGIN_FLAGS( wxListBoxStyle )
  47     // new style border flags, we put them first to
  48     // use them for streaming out
  49     wxFLAGS_MEMBER(wxBORDER_SIMPLE)
  50     wxFLAGS_MEMBER(wxBORDER_SUNKEN)
  51     wxFLAGS_MEMBER(wxBORDER_DOUBLE)
  52     wxFLAGS_MEMBER(wxBORDER_RAISED)
  53     wxFLAGS_MEMBER(wxBORDER_STATIC)
  54     wxFLAGS_MEMBER(wxBORDER_NONE)
  55
  56     // old style border flags
  57     wxFLAGS_MEMBER(wxSIMPLE_BORDER)
  58     wxFLAGS_MEMBER(wxSUNKEN_BORDER)
  59     wxFLAGS_MEMBER(wxDOUBLE_BORDER)
  60     wxFLAGS_MEMBER(wxRAISED_BORDER)
  61     wxFLAGS_MEMBER(wxSTATIC_BORDER)
  62     wxFLAGS_MEMBER(wxBORDER)
  63
  64     // standard window styles
  65     wxFLAGS_MEMBER(wxTAB_TRAVERSAL)
  66     wxFLAGS_MEMBER(wxCLIP_CHILDREN)
  67     wxFLAGS_MEMBER(wxTRANSPARENT_WINDOW)
  68     wxFLAGS_MEMBER(wxWANTS_CHARS)
  69     wxFLAGS_MEMBER(wxFULL_REPAINT_ON_RESIZE)
  70     wxFLAGS_MEMBER(wxALWAYS_SHOW_SB )
  71     wxFLAGS_MEMBER(wxVSCROLL)
  72     wxFLAGS_MEMBER(wxHSCROLL)
  73
  74     wxFLAGS_MEMBER(wxLB_SINGLE)
  75     wxFLAGS_MEMBER(wxLB_MULTIPLE)
  76     wxFLAGS_MEMBER(wxLB_EXTENDED)
  77     wxFLAGS_MEMBER(wxLB_HSCROLL)
  78     wxFLAGS_MEMBER(wxLB_ALWAYS_SB)
  79     wxFLAGS_MEMBER(wxLB_NEEDED_SB)
  80     wxFLAGS_MEMBER(wxLB_SORT)
  81
  82 wxEND_FLAGS( wxListBoxStyle )
  83
  84 IMPLEMENT_DYNAMIC_CLASS_XTI(wxListBox, wxControlWithItems,"wx/listbox.h")
  85
  86 wxBEGIN_PROPERTIES_TABLE(wxListBox)
  87     wxEVENT_PROPERTY( Select , wxEVT_COMMAND_LISTBOX_SELECTED , wxCommandEvent )
  88     wxEVENT_PROPERTY( DoubleClick , wxEVT_COMMAND_LISTBOX_DOUBLECLICKED , wxCommandEvent )
  89
  90     wxPROPERTY( Font , wxFont , SetFont , GetFont  , EMPTY_MACROVALUE, 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
  91     wxPROPERTY_COLLECTION( Choices , wxArrayString , wxString , AppendString , GetStrings, 0 /*flags*/ , wxT("Helpstring") , wxT("group") )
  92     wxPROPERTY( Selection ,int, SetSelection, GetSelection, EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group") )
  93     wxPROPERTY_FLAGS( WindowStyle , wxListBoxStyle , long , SetWindowStyleFlag , GetWindowStyleFlag , EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group")) // style
  94 wxEND_PROPERTIES_TABLE()
  95
  96 wxBEGIN_HANDLERS_TABLE(wxListBox)
  97 wxEND_HANDLERS_TABLE()
  98
  99 wxCONSTRUCTOR_4( wxListBox , wxWindow* , Parent , wxWindowID , Id , wxPoint , Position , wxSize , Size )
 100 #else
 101 IMPLEMENT_DYNAMIC_CLASS(wxListBox, wxControlWithItems)
 102 #endif
 103
 104 /*
 105 TODO PROPERTIES
 106     selection
 107     content
 108         item
 109 */
 110
 111 // ============================================================================
 112 // list box item declaration and implementation
 113 // ============================================================================
 114
 115 #if wxUSE_OWNER_DRAWN
 116
 117 class wxListBoxItem : public wxOwnerDrawn
 118 {
 119 public:
 120     wxListBoxItem(const wxString& str = wxEmptyString);
 121 };
 122
 123 wxListBoxItem::wxListBoxItem(const wxString& str) : wxOwnerDrawn(str, false)
 124 {
 125     // no bitmaps/checkmarks
 126     SetMarginWidth(0);
 127 }
 128
 129 wxOwnerDrawn *wxListBox::CreateLboxItem(size_t WXUNUSED(n))
 130 {
 131     return new wxListBoxItem();
 132 }
 133
 134 #endif  //USE_OWNER_DRAWN
 135
 136 // ============================================================================
 137 // list box control implementation
 138 // ============================================================================
 139
 140 // ----------------------------------------------------------------------------
 141 // creation
 142 // ----------------------------------------------------------------------------
 143
 144 // Listbox item
 145 wxListBox::wxListBox()
 146 {
 147     m_noItems = 0;
 148     m_updateHorizontalExtent = false;
 149 }
 150
 151 bool wxListBox::Create(wxWindow *parent,
 152                        wxWindowID id,
 153                        const wxPoint& pos,
 154                        const wxSize& size,
 155                        int n, const wxString choices[],
 156                        long style,
 157                        const wxValidator& validator,
 158                        const wxString& name)
 159 {
 160     m_noItems = 0;
 161     m_updateHorizontalExtent = false;
 162
 163     // initialize base class fields
 164     if ( !CreateControl(parent, id, pos, size, style, validator, name) )
 165         return false;
 166
 167     // create the native control
 168     if ( !MSWCreateControl(_T("LISTBOX"), wxEmptyString, pos, size) )
 169     {
 170         // control creation failed
 171         return false;
 172     }
 173
 174     // initialize the contents
 175     for ( int i = 0; i < n; i++ )
 176     {
 177         Append(choices[i]);
 178     }
 179
 180     // now we can compute our best size correctly, so do it 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 void wxListBox::OnInternalIdle()
 249 {
 250     wxWindow::OnInternalIdle();
 251
 252     if (m_updateHorizontalExtent)
 253     {
 254         SetHorizontalExtent(wxEmptyString);
 255         m_updateHorizontalExtent = false;
 256     }
 257 }
 258
 259 // ----------------------------------------------------------------------------
 260 // implementation of wxListBoxBase methods
 261 // ----------------------------------------------------------------------------
 262
 263 void wxListBox::DoSetFirstItem(int N)
 264 {
 265     wxCHECK_RET( IsValid(N),
 266                  wxT("invalid index in wxListBox::SetFirstItem") );
 267
 268     SendMessage(GetHwnd(), LB_SETTOPINDEX, (WPARAM)N, (LPARAM)0);
 269 }
 270
 271 void wxListBox::DoDeleteOneItem(unsigned int n)
 272 {
 273     wxCHECK_RET( IsValid(n),
 274                  wxT("invalid index in wxListBox::Delete") );
 275
 276     SendMessage(GetHwnd(), LB_DELETESTRING, n, 0);
 277     m_noItems--;
 278
 279     // SetHorizontalExtent(wxEmptyString); can be slow
 280     m_updateHorizontalExtent = true;
 281
 282     UpdateOldSelections();
 283 }
 284
 285 int wxListBox::FindString(const wxString& s, bool bCase) const
 286 {
 287     // back to base class search for not native search type
 288     if (bCase)
 289        return wxItemContainerImmutable::FindString( s, bCase );
 290
 291     int pos = ListBox_FindStringExact(GetHwnd(), -1, s.wx_str());
 292     if (pos == LB_ERR)
 293         return wxNOT_FOUND;
 294     else
 295         return pos;
 296 }
 297
 298 void wxListBox::DoClear()
 299 {
 300     Free();
 301
 302     ListBox_ResetContent(GetHwnd());
 303
 304     m_noItems = 0;
 305     m_updateHorizontalExtent = true;
 306
 307     UpdateOldSelections();
 308 }
 309
 310 void wxListBox::Free()
 311 {
 312 #if wxUSE_OWNER_DRAWN
 313     if ( m_windowStyle & wxLB_OWNERDRAW )
 314     {
 315         WX_CLEAR_ARRAY(m_aItems);
 316     }
 317 #endif // wxUSE_OWNER_DRAWN
 318 }
 319
 320 void wxListBox::DoSetSelection(int N, bool select)
 321 {
 322     wxCHECK_RET( N == wxNOT_FOUND || IsValid(N),
 323                  wxT("invalid index in wxListBox::SetSelection") );
 324
 325     if ( HasMultipleSelection() )
 326     {
 327         SendMessage(GetHwnd(), LB_SETSEL, select, N);
 328     }
 329     else
 330     {
 331         SendMessage(GetHwnd(), LB_SETCURSEL, select ? N : -1, 0);
 332     }
 333
 334     UpdateOldSelections();
 335 }
 336
 337 bool wxListBox::IsSelected(int N) const
 338 {
 339     wxCHECK_MSG( IsValid(N), false,
 340                  wxT("invalid index in wxListBox::Selected") );
 341
 342     return SendMessage(GetHwnd(), LB_GETSEL, N, 0) == 0 ? false : true;
 343 }
 344
 345 void *wxListBox::DoGetItemClientData(unsigned int n) const
 346 {
 347     wxCHECK_MSG( IsValid(n), NULL,
 348                  wxT("invalid index in wxListBox::GetClientData") );
 349
 350     return (void *)SendMessage(GetHwnd(), LB_GETITEMDATA, n, 0);
 351 }
 352
 353 void wxListBox::DoSetItemClientData(unsigned int n, void *clientData)
 354 {
 355     wxCHECK_RET( IsValid(n),
 356                  wxT("invalid index in wxListBox::SetClientData") );
 357
 358 #if wxUSE_OWNER_DRAWN
 359     if ( m_windowStyle & wxLB_OWNERDRAW )
 360     {
 361         // client data must be pointer to wxOwnerDrawn, otherwise we would crash
 362         // in OnMeasure/OnDraw.
 363         wxFAIL_MSG(wxT("Can't use client data with owner-drawn listboxes"));
 364     }
 365 #endif // wxUSE_OWNER_DRAWN
 366
 367     if ( ListBox_SetItemData(GetHwnd(), n, clientData) == LB_ERR )
 368         wxLogDebug(wxT("LB_SETITEMDATA failed"));
 369 }
 370
 371 // Return number of selections and an array of selected integers
 372 int wxListBox::GetSelections(wxArrayInt& aSelections) const
 373 {
 374     aSelections.Empty();
 375
 376     if ( HasMultipleSelection() )
 377     {
 378         int countSel = ListBox_GetSelCount(GetHwnd());
 379         if ( countSel == LB_ERR )
 380         {
 381             wxLogDebug(_T("ListBox_GetSelCount failed"));
 382         }
 383         else if ( countSel != 0 )
 384         {
 385             int *selections = new int[countSel];
 386
 387             if ( ListBox_GetSelItems(GetHwnd(),
 388                                      countSel, selections) == LB_ERR )
 389             {
 390                 wxLogDebug(wxT("ListBox_GetSelItems failed"));
 391                 countSel = -1;
 392             }
 393             else
 394             {
 395                 aSelections.Alloc(countSel);
 396                 for ( int n = 0; n < countSel; n++ )
 397                     aSelections.Add(selections[n]);
 398             }
 399
 400             delete [] selections;
 401         }
 402
 403         return countSel;
 404     }
 405     else  // single-selection listbox
 406     {
 407         if (ListBox_GetCurSel(GetHwnd()) > -1)
 408             aSelections.Add(ListBox_GetCurSel(GetHwnd()));
 409
 410         return aSelections.Count();
 411     }
 412 }
 413
 414 // Get single selection, for single choice list items
 415 int wxListBox::GetSelection() const
 416 {
 417     wxCHECK_MSG( !HasMultipleSelection(),
 418                  -1,
 419                  wxT("GetSelection() can't be used with multiple-selection listboxes, use GetSelections() instead.") );
 420
 421     return ListBox_GetCurSel(GetHwnd());
 422 }
 423
 424 // Find string for position
 425 wxString wxListBox::GetString(unsigned int n) const
 426 {
 427     wxCHECK_MSG( IsValid(n), wxEmptyString,
 428                  wxT("invalid index in wxListBox::GetString") );
 429
 430     int len = ListBox_GetTextLen(GetHwnd(), n);
 431
 432     // +1 for terminating NUL
 433     wxString result;
 434     ListBox_GetText(GetHwnd(), n, (wxChar*)wxStringBuffer(result, len + 1));
 435
 436     return result;
 437 }
 438
 439 int wxListBox::DoInsertItems(const wxArrayStringsAdapter & items,
 440                              unsigned int pos,
 441                              void **clientData,
 442                              wxClientDataType type)
 443 {
 444     MSWAllocStorage(items, LB_INITSTORAGE);
 445
 446     const bool append = pos == GetCount();
 447
 448     // we must use CB_ADDSTRING when appending as only it works correctly for
 449     // the sorted controls
 450     const unsigned msg = append ? LB_ADDSTRING : LB_INSERTSTRING;
 451
 452     if ( append )
 453         pos = 0;
 454
 455     int n = wxNOT_FOUND;
 456
 457     const unsigned int numItems = items.GetCount();
 458     for ( unsigned int i = 0; i < numItems; i++ )
 459     {
 460         n = MSWInsertOrAppendItem(pos, items[i], msg);
 461         if ( n == wxNOT_FOUND )
 462             return n;
 463
 464         if ( !append )
 465             pos++;
 466
 467         ++m_noItems;
 468
 469 #if wxUSE_OWNER_DRAWN
 470         if ( HasFlag(wxLB_OWNERDRAW) )
 471         {
 472             wxOwnerDrawn *pNewItem = CreateLboxItem(n);
 473             pNewItem->SetName(items[i]);
 474             pNewItem->SetFont(GetFont());
 475             m_aItems.Insert(pNewItem, n);
 476
 477             ListBox_SetItemData(GetHwnd(), n, pNewItem);
 478         }
 479 #endif // wxUSE_OWNER_DRAWN
 480         AssignNewItemClientData(n, clientData, i, type);
 481     }
 482
 483     m_updateHorizontalExtent = true;
 484
 485     UpdateOldSelections();
 486
 487     return n;
 488 }
 489
 490 int wxListBox::DoListHitTest(const wxPoint& point) const
 491 {
 492     LRESULT lRes =  ::SendMessage(GetHwnd(), LB_ITEMFROMPOINT,
 493                                   0L, MAKELONG(point.x, point.y));
 494
 495     // non zero high-order word means that this item is outside of the client
 496     // area, IOW the point is outside of the listbox
 497     return HIWORD(lRes) ? wxNOT_FOUND : lRes;
 498 }
 499
 500 void wxListBox::SetString(unsigned int n, const wxString& s)
 501 {
 502     wxCHECK_RET( IsValid(n),
 503                  wxT("invalid index in wxListBox::SetString") );
 504
 505     // remember the state of the item
 506     bool wasSelected = IsSelected(n);
 507
 508     void *oldData = NULL;
 509     wxClientData *oldObjData = NULL;
 510     if ( HasClientUntypedData() )
 511         oldData = GetClientData(n);
 512     else if ( HasClientObjectData() )
 513         oldObjData = GetClientObject(n);
 514
 515     // delete and recreate it
 516     SendMessage(GetHwnd(), LB_DELETESTRING, n, 0);
 517
 518     int newN = n;
 519     if ( n == (m_noItems - 1) )
 520         newN = -1;
 521
 522     ListBox_InsertString(GetHwnd(), newN, s.wx_str());
 523
 524     // restore the client data
 525     if ( oldData )
 526         SetClientData(n, oldData);
 527     else if ( oldObjData )
 528         SetClientObject(n, oldObjData);
 529
 530 #if wxUSE_OWNER_DRAWN
 531     if ( m_windowStyle & wxLB_OWNERDRAW )
 532     {
 533         // update item's text
 534         m_aItems[n]->SetName(s);
 535
 536         // reassign the item's data
 537         ListBox_SetItemData(GetHwnd(), n, m_aItems[n]);
 538     }
 539 #endif  //USE_OWNER_DRAWN
 540
 541     // we may have lost the selection
 542     if ( wasSelected )
 543         Select(n);
 544
 545     m_updateHorizontalExtent = true;
 546 }
 547
 548 unsigned int wxListBox::GetCount() const
 549 {
 550     return m_noItems;
 551 }
 552
 553 // ----------------------------------------------------------------------------
 554 // size-related stuff
 555 // ----------------------------------------------------------------------------
 556
 557 void wxListBox::SetHorizontalExtent(const wxString& s)
 558 {
 559     // in any case, our best size could have changed
 560     InvalidateBestSize();
 561
 562     // the rest is only necessary if we want a horizontal scrollbar
 563     if ( !HasFlag(wxHSCROLL) )
 564         return;
 565
 566
 567     WindowHDC dc(GetHwnd());
 568     SelectInHDC selFont(dc, GetHfontOf(GetFont()));
 569
 570     TEXTMETRIC lpTextMetric;
 571     ::GetTextMetrics(dc, &lpTextMetric);
 572
 573     int largestExtent = 0;
 574     SIZE extentXY;
 575
 576     if ( s.empty() )
 577     {
 578         // set extent to the max length of all strings
 579         for ( unsigned int i = 0; i < m_noItems; i++ )
 580         {
 581             const wxString str = GetString(i);
 582             ::GetTextExtentPoint32(dc, str.c_str(), str.length(), &extentXY);
 583
 584             int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 585             if ( extentX > largestExtent )
 586                 largestExtent = extentX;
 587         }
 588     }
 589     else // just increase the extent to the length of this string
 590     {
 591         int existingExtent = (int)SendMessage(GetHwnd(),
 592                                               LB_GETHORIZONTALEXTENT, 0, 0L);
 593
 594         ::GetTextExtentPoint32(dc, s.c_str(), s.length(), &extentXY);
 595
 596         int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 597         if ( extentX > existingExtent )
 598             largestExtent = extentX;
 599     }
 600
 601     if ( largestExtent )
 602         SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(largestExtent), 0L);
 603     //else: it shouldn't change
 604 }
 605
 606 wxSize wxListBox::DoGetBestSize() const
 607 {
 608     // find the widest string
 609     int wLine;
 610     int wListbox = 0;
 611     for (unsigned int i = 0; i < m_noItems; i++)
 612     {
 613         wxString str(GetString(i));
 614         GetTextExtent(str, &wLine, NULL);
 615         if ( wLine > wListbox )
 616             wListbox = wLine;
 617     }
 618
 619     // give it some reasonable default value if there are no strings in the
 620     // list
 621     if ( wListbox == 0 )
 622         wListbox = 100;
 623
 624     // the listbox should be slightly larger than the widest string
 625     int cx, cy;
 626     wxGetCharSize(GetHWND(), &cx, &cy, GetFont());
 627
 628     wListbox += 3*cx;
 629
 630     // Add room for the scrollbar
 631     wListbox += wxSystemSettings::GetMetric(wxSYS_VSCROLL_X);
 632
 633     // don't make the listbox too tall (limit height to 10 items) but don't
 634     // make it too small neither
 635     int hListbox = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy)*
 636                     wxMin(wxMax(m_noItems, 3), 10);
 637
 638     wxSize best(wListbox, hListbox);
 639     CacheBestSize(best);
 640     return best;
 641 }
 642
 643 // ----------------------------------------------------------------------------
 644 // callbacks
 645 // ----------------------------------------------------------------------------
 646
 647 bool wxListBox::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 648 {
 649     if ((param == LBN_SELCHANGE) && HasMultipleSelection())
 650     {
 651         CalcAndSendEvent();
 652         return true;
 653     }
 654
 655     wxEventType evtType;
 656     if ( param == LBN_SELCHANGE )
 657     {
 658         evtType = wxEVT_COMMAND_LISTBOX_SELECTED;
 659     }
 660     else if ( param == LBN_DBLCLK )
 661     {
 662         evtType = wxEVT_COMMAND_LISTBOX_DOUBLECLICKED;
 663     }
 664     else
 665     {
 666         // some event we're not interested in
 667         return false;
 668     }
 669
 670     wxCommandEvent event(evtType, m_windowId);
 671     event.SetEventObject( this );
 672
 673     // retrieve the affected item
 674     int n = SendMessage(GetHwnd(), LB_GETCARETINDEX, 0, 0);
 675     if ( n != LB_ERR )
 676     {
 677         if ( HasClientObjectData() )
 678             event.SetClientObject( GetClientObject(n) );
 679         else if ( HasClientUntypedData() )
 680             event.SetClientData( GetClientData(n) );
 681
 682         event.SetString(GetString(n));
 683     }
 684     else
 685     {
 686         return false;
 687     }
 688
 689     event.SetInt(n);
 690
 691     return HandleWindowEvent(event);
 692 }
 693
 694 // ----------------------------------------------------------------------------
 695 // wxCheckListBox support
 696 // ----------------------------------------------------------------------------
 697
 698 #if wxUSE_OWNER_DRAWN
 699
 700 // drawing
 701 // -------
 702
 703 // space beneath/above each row in pixels
 704 // "standard" checklistbox use 1 here, some might prefer 2. 0 is ugly.
 705 #define OWNER_DRAWN_LISTBOX_EXTRA_SPACE    (1)
 706
 707 // the height is the same for all items
 708 // TODO should be changed for LBS_OWNERDRAWVARIABLE style listboxes
 709
 710 // NB: can't forward this to wxListBoxItem because LB_SETITEMDATA
 711 //     message is not yet sent when we get here!
 712 bool wxListBox::MSWOnMeasure(WXMEASUREITEMSTRUCT *item)
 713 {
 714     // only owner-drawn control should receive this message
 715     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), false );
 716
 717     MEASUREITEMSTRUCT *pStruct = (MEASUREITEMSTRUCT *)item;
 718
 719 #ifdef __WXWINCE__
 720     HDC hdc = GetDC(NULL);
 721 #else
 722     HDC hdc = CreateIC(wxT("DISPLAY"), NULL, NULL, 0);
 723 #endif
 724
 725     {
 726         wxDCTemp dc((WXHDC)hdc);
 727         dc.SetFont(GetFont());
 728
 729         pStruct->itemHeight = dc.GetCharHeight() + 2*OWNER_DRAWN_LISTBOX_EXTRA_SPACE;
 730         pStruct->itemWidth  = dc.GetCharWidth();
 731     }
 732
 733 #ifdef __WXWINCE__
 734     ReleaseDC(NULL, hdc);
 735 #else
 736     DeleteDC(hdc);
 737 #endif
 738
 739     return true;
 740 }
 741
 742 // forward the message to the appropriate item
 743 bool wxListBox::MSWOnDraw(WXDRAWITEMSTRUCT *item)
 744 {
 745     // only owner-drawn control should receive this message
 746     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), false );
 747
 748     DRAWITEMSTRUCT *pStruct = (DRAWITEMSTRUCT *)item;
 749     UINT itemID = pStruct->itemID;
 750
 751     // the item may be -1 for an empty listbox
 752     if ( itemID == (UINT)-1 )
 753         return false;
 754
 755     LRESULT data = ListBox_GetItemData(GetHwnd(), pStruct->itemID);
 756
 757     wxCHECK( data && (data != LB_ERR), false );
 758
 759     wxListBoxItem *pItem = (wxListBoxItem *)data;
 760
 761     wxDCTemp dc((WXHDC)pStruct->hDC);
 762     wxPoint pt1(pStruct->rcItem.left, pStruct->rcItem.top);
 763     wxPoint pt2(pStruct->rcItem.right, pStruct->rcItem.bottom);
 764     wxRect rect(pt1, pt2);
 765
 766     return pItem->OnDrawItem(dc, rect,
 767                              (wxOwnerDrawn::wxODAction)pStruct->itemAction,
 768                              (wxOwnerDrawn::wxODStatus)pStruct->itemState);
 769 }
 770
 771 #endif // wxUSE_OWNER_DRAWN
 772
 773 #endif // wxUSE_LISTBOX