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 again
 181     InvalidateBestSize();
 182     SetInitialSize(size);
 183
 184     return true;
 185 }
 186
 187 bool wxListBox::Create(wxWindow *parent,
 188                        wxWindowID id,
 189                        const wxPoint& pos,
 190                        const wxSize& size,
 191                        const wxArrayString& choices,
 192                        long style,
 193                        const wxValidator& validator,
 194                        const wxString& name)
 195 {
 196     wxCArrayString chs(choices);
 197     return Create(parent, id, pos, size, chs.GetCount(), chs.GetStrings(),
 198                   style, validator, name);
 199 }
 200
 201 wxListBox::~wxListBox()
 202 {
 203     Clear();
 204 }
 205
 206 WXDWORD wxListBox::MSWGetStyle(long style, WXDWORD *exstyle) const
 207 {
 208     WXDWORD msStyle = wxControl::MSWGetStyle(style, exstyle);
 209
 210     // always show the vertical scrollbar if necessary -- otherwise it is
 211     // impossible to use the control with the mouse
 212     msStyle |= WS_VSCROLL;
 213
 214     // we always want to get the notifications
 215     msStyle |= LBS_NOTIFY;
 216
 217     // without this style, you get unexpected heights, so e.g. constraint
 218     // layout doesn't work properly
 219     msStyle |= LBS_NOINTEGRALHEIGHT;
 220
 221     wxASSERT_MSG( !(style & wxLB_MULTIPLE) || !(style & wxLB_EXTENDED),
 222                   _T("only one of listbox selection modes can be specified") );
 223
 224     if ( style & wxLB_MULTIPLE )
 225         msStyle |= LBS_MULTIPLESEL;
 226     else if ( style & wxLB_EXTENDED )
 227         msStyle |= LBS_EXTENDEDSEL;
 228
 229     if ( m_windowStyle & wxLB_ALWAYS_SB )
 230         msStyle |= LBS_DISABLENOSCROLL;
 231     if ( m_windowStyle & wxLB_HSCROLL )
 232         msStyle |= WS_HSCROLL;
 233     if ( m_windowStyle & wxLB_SORT )
 234         msStyle |= LBS_SORT;
 235
 236 #if wxUSE_OWNER_DRAWN && !defined(__WXWINCE__)
 237     if ( m_windowStyle & wxLB_OWNERDRAW )
 238     {
 239         // we don't support LBS_OWNERDRAWVARIABLE yet and we also always put
 240         // the strings in the listbox for simplicity even though we could have
 241         // avoided it in this case
 242         msStyle |= LBS_OWNERDRAWFIXED | LBS_HASSTRINGS;
 243     }
 244 #endif // wxUSE_OWNER_DRAWN
 245
 246     return msStyle;
 247 }
 248
 249 void wxListBox::OnInternalIdle()
 250 {
 251     wxWindow::OnInternalIdle();
 252
 253     if (m_updateHorizontalExtent)
 254     {
 255         SetHorizontalExtent(wxEmptyString);
 256         m_updateHorizontalExtent = false;
 257     }
 258 }
 259
 260 // ----------------------------------------------------------------------------
 261 // implementation of wxListBoxBase methods
 262 // ----------------------------------------------------------------------------
 263
 264 void wxListBox::DoSetFirstItem(int N)
 265 {
 266     wxCHECK_RET( IsValid(N),
 267                  wxT("invalid index in wxListBox::SetFirstItem") );
 268
 269     SendMessage(GetHwnd(), LB_SETTOPINDEX, (WPARAM)N, (LPARAM)0);
 270 }
 271
 272 void wxListBox::DoDeleteOneItem(unsigned int n)
 273 {
 274     wxCHECK_RET( IsValid(n),
 275                  wxT("invalid index in wxListBox::Delete") );
 276
 277     SendMessage(GetHwnd(), LB_DELETESTRING, n, 0);
 278     m_noItems--;
 279
 280     // SetHorizontalExtent(wxEmptyString); can be slow
 281     m_updateHorizontalExtent = true;
 282
 283     UpdateOldSelections();
 284 }
 285
 286 int wxListBox::FindString(const wxString& s, bool bCase) const
 287 {
 288     // back to base class search for not native search type
 289     if (bCase)
 290        return wxItemContainerImmutable::FindString( s, bCase );
 291
 292     int pos = ListBox_FindStringExact(GetHwnd(), -1, s.wx_str());
 293     if (pos == LB_ERR)
 294         return wxNOT_FOUND;
 295     else
 296         return pos;
 297 }
 298
 299 void wxListBox::DoClear()
 300 {
 301     Free();
 302
 303     ListBox_ResetContent(GetHwnd());
 304
 305     m_noItems = 0;
 306     m_updateHorizontalExtent = true;
 307
 308     UpdateOldSelections();
 309 }
 310
 311 void wxListBox::Free()
 312 {
 313 #if wxUSE_OWNER_DRAWN
 314     if ( m_windowStyle & wxLB_OWNERDRAW )
 315     {
 316         WX_CLEAR_ARRAY(m_aItems);
 317     }
 318 #endif // wxUSE_OWNER_DRAWN
 319 }
 320
 321 void wxListBox::DoSetSelection(int N, bool select)
 322 {
 323     wxCHECK_RET( N == wxNOT_FOUND || IsValid(N),
 324                  wxT("invalid index in wxListBox::SetSelection") );
 325
 326     if ( HasMultipleSelection() )
 327     {
 328         SendMessage(GetHwnd(), LB_SETSEL, select, N);
 329     }
 330     else
 331     {
 332         SendMessage(GetHwnd(), LB_SETCURSEL, select ? N : -1, 0);
 333     }
 334
 335     UpdateOldSelections();
 336 }
 337
 338 bool wxListBox::IsSelected(int N) const
 339 {
 340     wxCHECK_MSG( IsValid(N), false,
 341                  wxT("invalid index in wxListBox::Selected") );
 342
 343     return SendMessage(GetHwnd(), LB_GETSEL, N, 0) == 0 ? false : true;
 344 }
 345
 346 void *wxListBox::DoGetItemClientData(unsigned int n) const
 347 {
 348     wxCHECK_MSG( IsValid(n), NULL,
 349                  wxT("invalid index in wxListBox::GetClientData") );
 350
 351     return (void *)SendMessage(GetHwnd(), LB_GETITEMDATA, n, 0);
 352 }
 353
 354 void wxListBox::DoSetItemClientData(unsigned int n, void *clientData)
 355 {
 356     wxCHECK_RET( IsValid(n),
 357                  wxT("invalid index in wxListBox::SetClientData") );
 358
 359 #if wxUSE_OWNER_DRAWN
 360     if ( m_windowStyle & wxLB_OWNERDRAW )
 361     {
 362         // client data must be pointer to wxOwnerDrawn, otherwise we would crash
 363         // in OnMeasure/OnDraw.
 364         wxFAIL_MSG(wxT("Can't use client data with owner-drawn listboxes"));
 365     }
 366 #endif // wxUSE_OWNER_DRAWN
 367
 368     if ( ListBox_SetItemData(GetHwnd(), n, clientData) == LB_ERR )
 369         wxLogDebug(wxT("LB_SETITEMDATA failed"));
 370 }
 371
 372 // Return number of selections and an array of selected integers
 373 int wxListBox::GetSelections(wxArrayInt& aSelections) const
 374 {
 375     aSelections.Empty();
 376
 377     if ( HasMultipleSelection() )
 378     {
 379         int countSel = ListBox_GetSelCount(GetHwnd());
 380         if ( countSel == LB_ERR )
 381         {
 382             wxLogDebug(_T("ListBox_GetSelCount failed"));
 383         }
 384         else if ( countSel != 0 )
 385         {
 386             int *selections = new int[countSel];
 387
 388             if ( ListBox_GetSelItems(GetHwnd(),
 389                                      countSel, selections) == LB_ERR )
 390             {
 391                 wxLogDebug(wxT("ListBox_GetSelItems failed"));
 392                 countSel = -1;
 393             }
 394             else
 395             {
 396                 aSelections.Alloc(countSel);
 397                 for ( int n = 0; n < countSel; n++ )
 398                     aSelections.Add(selections[n]);
 399             }
 400
 401             delete [] selections;
 402         }
 403
 404         return countSel;
 405     }
 406     else  // single-selection listbox
 407     {
 408         if (ListBox_GetCurSel(GetHwnd()) > -1)
 409             aSelections.Add(ListBox_GetCurSel(GetHwnd()));
 410
 411         return aSelections.Count();
 412     }
 413 }
 414
 415 // Get single selection, for single choice list items
 416 int wxListBox::GetSelection() const
 417 {
 418     wxCHECK_MSG( !HasMultipleSelection(),
 419                  -1,
 420                  wxT("GetSelection() can't be used with multiple-selection listboxes, use GetSelections() instead.") );
 421
 422     return ListBox_GetCurSel(GetHwnd());
 423 }
 424
 425 // Find string for position
 426 wxString wxListBox::GetString(unsigned int n) const
 427 {
 428     wxCHECK_MSG( IsValid(n), wxEmptyString,
 429                  wxT("invalid index in wxListBox::GetString") );
 430
 431     int len = ListBox_GetTextLen(GetHwnd(), n);
 432
 433     // +1 for terminating NUL
 434     wxString result;
 435     ListBox_GetText(GetHwnd(), n, (wxChar*)wxStringBuffer(result, len + 1));
 436
 437     return result;
 438 }
 439
 440 int wxListBox::DoInsertItems(const wxArrayStringsAdapter & items,
 441                              unsigned int pos,
 442                              void **clientData,
 443                              wxClientDataType type)
 444 {
 445     MSWAllocStorage(items, LB_INITSTORAGE);
 446
 447     const bool append = pos == GetCount();
 448
 449     // we must use CB_ADDSTRING when appending as only it works correctly for
 450     // the sorted controls
 451     const unsigned msg = append ? LB_ADDSTRING : LB_INSERTSTRING;
 452
 453     if ( append )
 454         pos = 0;
 455
 456     int n = wxNOT_FOUND;
 457
 458     const unsigned int numItems = items.GetCount();
 459     for ( unsigned int i = 0; i < numItems; i++ )
 460     {
 461         n = MSWInsertOrAppendItem(pos, items[i], msg);
 462         if ( n == wxNOT_FOUND )
 463             return n;
 464
 465         if ( !append )
 466             pos++;
 467
 468         ++m_noItems;
 469
 470 #if wxUSE_OWNER_DRAWN
 471         if ( HasFlag(wxLB_OWNERDRAW) )
 472         {
 473             wxOwnerDrawn *pNewItem = CreateLboxItem(n);
 474             pNewItem->SetName(items[i]);
 475             pNewItem->SetFont(GetFont());
 476             m_aItems.Insert(pNewItem, n);
 477
 478             ListBox_SetItemData(GetHwnd(), n, pNewItem);
 479         }
 480 #endif // wxUSE_OWNER_DRAWN
 481         AssignNewItemClientData(n, clientData, i, type);
 482     }
 483
 484     m_updateHorizontalExtent = true;
 485
 486     UpdateOldSelections();
 487
 488     return n;
 489 }
 490
 491 int wxListBox::DoListHitTest(const wxPoint& point) const
 492 {
 493     LRESULT lRes =  ::SendMessage(GetHwnd(), LB_ITEMFROMPOINT,
 494                                   0L, MAKELONG(point.x, point.y));
 495
 496     // non zero high-order word means that this item is outside of the client
 497     // area, IOW the point is outside of the listbox
 498     return HIWORD(lRes) ? wxNOT_FOUND : lRes;
 499 }
 500
 501 void wxListBox::SetString(unsigned int n, const wxString& s)
 502 {
 503     wxCHECK_RET( IsValid(n),
 504                  wxT("invalid index in wxListBox::SetString") );
 505
 506     // remember the state of the item
 507     bool wasSelected = IsSelected(n);
 508
 509     void *oldData = NULL;
 510     wxClientData *oldObjData = NULL;
 511     if ( HasClientUntypedData() )
 512         oldData = GetClientData(n);
 513     else if ( HasClientObjectData() )
 514         oldObjData = GetClientObject(n);
 515
 516     // delete and recreate it
 517     SendMessage(GetHwnd(), LB_DELETESTRING, n, 0);
 518
 519     int newN = n;
 520     if ( n == (m_noItems - 1) )
 521         newN = -1;
 522
 523     ListBox_InsertString(GetHwnd(), newN, s.wx_str());
 524
 525     // restore the client data
 526     if ( oldData )
 527         SetClientData(n, oldData);
 528     else if ( oldObjData )
 529         SetClientObject(n, oldObjData);
 530
 531 #if wxUSE_OWNER_DRAWN
 532     if ( m_windowStyle & wxLB_OWNERDRAW )
 533     {
 534         // update item's text
 535         m_aItems[n]->SetName(s);
 536
 537         // reassign the item's data
 538         ListBox_SetItemData(GetHwnd(), n, m_aItems[n]);
 539     }
 540 #endif  //USE_OWNER_DRAWN
 541
 542     // we may have lost the selection
 543     if ( wasSelected )
 544         Select(n);
 545
 546     m_updateHorizontalExtent = true;
 547 }
 548
 549 unsigned int wxListBox::GetCount() const
 550 {
 551     return m_noItems;
 552 }
 553
 554 // ----------------------------------------------------------------------------
 555 // size-related stuff
 556 // ----------------------------------------------------------------------------
 557
 558 void wxListBox::SetHorizontalExtent(const wxString& s)
 559 {
 560     // in any case, our best size could have changed
 561     InvalidateBestSize();
 562
 563     // the rest is only necessary if we want a horizontal scrollbar
 564     if ( !HasFlag(wxHSCROLL) )
 565         return;
 566
 567
 568     WindowHDC dc(GetHwnd());
 569     SelectInHDC selFont(dc, GetHfontOf(GetFont()));
 570
 571     TEXTMETRIC lpTextMetric;
 572     ::GetTextMetrics(dc, &lpTextMetric);
 573
 574     int largestExtent = 0;
 575     SIZE extentXY;
 576
 577     if ( s.empty() )
 578     {
 579         // set extent to the max length of all strings
 580         for ( unsigned int i = 0; i < m_noItems; i++ )
 581         {
 582             const wxString str = GetString(i);
 583             ::GetTextExtentPoint32(dc, str.c_str(), str.length(), &extentXY);
 584
 585             int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 586             if ( extentX > largestExtent )
 587                 largestExtent = extentX;
 588         }
 589     }
 590     else // just increase the extent to the length of this string
 591     {
 592         int existingExtent = (int)SendMessage(GetHwnd(),
 593                                               LB_GETHORIZONTALEXTENT, 0, 0L);
 594
 595         ::GetTextExtentPoint32(dc, s.c_str(), s.length(), &extentXY);
 596
 597         int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 598         if ( extentX > existingExtent )
 599             largestExtent = extentX;
 600     }
 601
 602     if ( largestExtent )
 603         SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(largestExtent), 0L);
 604     //else: it shouldn't change
 605 }
 606
 607 wxSize wxListBox::DoGetBestSize() const
 608 {
 609     // find the widest string
 610     int wLine;
 611     int wListbox = 0;
 612     for (unsigned int i = 0; i < m_noItems; i++)
 613     {
 614         wxString str(GetString(i));
 615         GetTextExtent(str, &wLine, NULL);
 616         if ( wLine > wListbox )
 617             wListbox = wLine;
 618     }
 619
 620     // give it some reasonable default value if there are no strings in the
 621     // list
 622     if ( wListbox == 0 )
 623         wListbox = 100;
 624
 625     // the listbox should be slightly larger than the widest string
 626     int cx, cy;
 627     wxGetCharSize(GetHWND(), &cx, &cy, GetFont());
 628
 629     wListbox += 3*cx;
 630
 631     // Add room for the scrollbar
 632     wListbox += wxSystemSettings::GetMetric(wxSYS_VSCROLL_X);
 633
 634     // don't make the listbox too tall (limit height to 10 items) but don't
 635     // make it too small neither
 636     int hListbox = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy)*
 637                     wxMin(wxMax(m_noItems, 3), 10);
 638
 639     wxSize best(wListbox, hListbox);
 640     CacheBestSize(best);
 641     return best;
 642 }
 643
 644 // ----------------------------------------------------------------------------
 645 // callbacks
 646 // ----------------------------------------------------------------------------
 647
 648 bool wxListBox::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 649 {
 650     if ((param == LBN_SELCHANGE) && HasMultipleSelection())
 651     {
 652         CalcAndSendEvent();
 653         return true;
 654     }
 655
 656     wxEventType evtType;
 657     if ( param == LBN_SELCHANGE )
 658     {
 659         evtType = wxEVT_COMMAND_LISTBOX_SELECTED;
 660     }
 661     else if ( param == LBN_DBLCLK )
 662     {
 663         evtType = wxEVT_COMMAND_LISTBOX_DOUBLECLICKED;
 664     }
 665     else
 666     {
 667         // some event we're not interested in
 668         return false;
 669     }
 670
 671     wxCommandEvent event(evtType, m_windowId);
 672     event.SetEventObject( this );
 673
 674     // retrieve the affected item
 675     int n = SendMessage(GetHwnd(), LB_GETCARETINDEX, 0, 0);
 676     if ( n != LB_ERR )
 677     {
 678         if ( HasClientObjectData() )
 679             event.SetClientObject( GetClientObject(n) );
 680         else if ( HasClientUntypedData() )
 681             event.SetClientData( GetClientData(n) );
 682
 683         event.SetString(GetString(n));
 684     }
 685     else
 686     {
 687         return false;
 688     }
 689
 690     event.SetInt(n);
 691
 692     return HandleWindowEvent(event);
 693 }
 694
 695 // ----------------------------------------------------------------------------
 696 // wxCheckListBox support
 697 // ----------------------------------------------------------------------------
 698
 699 #if wxUSE_OWNER_DRAWN
 700
 701 // drawing
 702 // -------
 703
 704 // space beneath/above each row in pixels
 705 // "standard" checklistbox use 1 here, some might prefer 2. 0 is ugly.
 706 #define OWNER_DRAWN_LISTBOX_EXTRA_SPACE    (1)
 707
 708 // the height is the same for all items
 709 // TODO should be changed for LBS_OWNERDRAWVARIABLE style listboxes
 710
 711 // NB: can't forward this to wxListBoxItem because LB_SETITEMDATA
 712 //     message is not yet sent when we get here!
 713 bool wxListBox::MSWOnMeasure(WXMEASUREITEMSTRUCT *item)
 714 {
 715     // only owner-drawn control should receive this message
 716     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), false );
 717
 718     MEASUREITEMSTRUCT *pStruct = (MEASUREITEMSTRUCT *)item;
 719
 720 #ifdef __WXWINCE__
 721     HDC hdc = GetDC(NULL);
 722 #else
 723     HDC hdc = CreateIC(wxT("DISPLAY"), NULL, NULL, 0);
 724 #endif
 725
 726     {
 727         wxDCTemp dc((WXHDC)hdc);
 728         dc.SetFont(GetFont());
 729
 730         pStruct->itemHeight = dc.GetCharHeight() + 2*OWNER_DRAWN_LISTBOX_EXTRA_SPACE;
 731         pStruct->itemWidth  = dc.GetCharWidth();
 732     }
 733
 734 #ifdef __WXWINCE__
 735     ReleaseDC(NULL, hdc);
 736 #else
 737     DeleteDC(hdc);
 738 #endif
 739
 740     return true;
 741 }
 742
 743 // forward the message to the appropriate item
 744 bool wxListBox::MSWOnDraw(WXDRAWITEMSTRUCT *item)
 745 {
 746     // only owner-drawn control should receive this message
 747     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), false );
 748
 749     DRAWITEMSTRUCT *pStruct = (DRAWITEMSTRUCT *)item;
 750     UINT itemID = pStruct->itemID;
 751
 752     // the item may be -1 for an empty listbox
 753     if ( itemID == (UINT)-1 )
 754         return false;
 755
 756     LRESULT data = ListBox_GetItemData(GetHwnd(), pStruct->itemID);
 757
 758     wxCHECK( data && (data != LB_ERR), false );
 759
 760     wxListBoxItem *pItem = (wxListBoxItem *)data;
 761
 762     wxDCTemp dc((WXHDC)pStruct->hDC);
 763     wxPoint pt1(pStruct->rcItem.left, pStruct->rcItem.top);
 764     wxPoint pt2(pStruct->rcItem.right, pStruct->rcItem.bottom);
 765     wxRect rect(pt1, pt2);
 766
 767     return pItem->OnDrawItem(dc, rect,
 768                              (wxOwnerDrawn::wxODAction)pStruct->itemAction,
 769                              (wxOwnerDrawn::wxODStatus)pStruct->itemState);
 770 }
 771
 772 #endif // wxUSE_OWNER_DRAWN
 773
 774 #endif // wxUSE_LISTBOX