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(wxListBox *parent)
 122         { m_parent = parent; }
 123
 124     wxListBox *GetParent() const
 125         { return m_parent; }
 126
 127     int GetIndex() const
 128         { return m_parent->GetItemIndex(const_cast<wxListBoxItem*>(this)); }
 129
 130     wxString GetName() const
 131         { return m_parent->GetString(GetIndex()); }
 132
 133 private:
 134     wxListBox *m_parent;
 135 };
 136
 137 wxOwnerDrawn *wxListBox::CreateLboxItem(size_t WXUNUSED(n))
 138 {
 139     return new wxListBoxItem(this);
 140 }
 141
 142 #endif  //USE_OWNER_DRAWN
 143
 144 // ============================================================================
 145 // list box control implementation
 146 // ============================================================================
 147
 148 // ----------------------------------------------------------------------------
 149 // creation
 150 // ----------------------------------------------------------------------------
 151
 152 // Listbox item
 153 wxListBox::wxListBox()
 154 {
 155     m_noItems = 0;
 156     m_updateHorizontalExtent = false;
 157 }
 158
 159 bool wxListBox::Create(wxWindow *parent,
 160                        wxWindowID id,
 161                        const wxPoint& pos,
 162                        const wxSize& size,
 163                        int n, const wxString choices[],
 164                        long style,
 165                        const wxValidator& validator,
 166                        const wxString& name)
 167 {
 168     m_noItems = 0;
 169     m_updateHorizontalExtent = false;
 170
 171     // initialize base class fields
 172     if ( !CreateControl(parent, id, pos, size, style, validator, name) )
 173         return false;
 174
 175     // create the native control
 176     if ( !MSWCreateControl(wxT("LISTBOX"), wxEmptyString, pos, size) )
 177     {
 178         // control creation failed
 179         return false;
 180     }
 181
 182     // initialize the contents
 183     for ( int i = 0; i < n; i++ )
 184     {
 185         Append(choices[i]);
 186     }
 187
 188     // now we can compute our best size correctly, so do it again
 189     InvalidateBestSize();
 190     SetInitialSize(size);
 191
 192     return true;
 193 }
 194
 195 bool wxListBox::Create(wxWindow *parent,
 196                        wxWindowID id,
 197                        const wxPoint& pos,
 198                        const wxSize& size,
 199                        const wxArrayString& choices,
 200                        long style,
 201                        const wxValidator& validator,
 202                        const wxString& name)
 203 {
 204     wxCArrayString chs(choices);
 205     return Create(parent, id, pos, size, chs.GetCount(), chs.GetStrings(),
 206                   style, validator, name);
 207 }
 208
 209 wxListBox::~wxListBox()
 210 {
 211     Clear();
 212 }
 213
 214 WXDWORD wxListBox::MSWGetStyle(long style, WXDWORD *exstyle) const
 215 {
 216     WXDWORD msStyle = wxControl::MSWGetStyle(style, exstyle);
 217
 218     // we always want to get the notifications
 219     msStyle |= LBS_NOTIFY;
 220
 221     // without this style, you get unexpected heights, so e.g. constraint
 222     // layout doesn't work properly
 223     msStyle |= LBS_NOINTEGRALHEIGHT;
 224
 225     wxASSERT_MSG( !(style & wxLB_MULTIPLE) || !(style & wxLB_EXTENDED),
 226                   wxT("only one of listbox selection modes can be specified") );
 227
 228     if ( style & wxLB_MULTIPLE )
 229         msStyle |= LBS_MULTIPLESEL;
 230     else if ( style & wxLB_EXTENDED )
 231         msStyle |= LBS_EXTENDEDSEL;
 232
 233     wxASSERT_MSG( !(style & wxLB_ALWAYS_SB) || !(style & wxLB_NO_SB),
 234                   wxT( "Conflicting styles wxLB_ALWAYS_SB and wxLB_NO_SB." ) );
 235
 236     if ( !(style & wxLB_NO_SB) )
 237     {
 238         msStyle |= WS_VSCROLL;
 239         if ( style & wxLB_ALWAYS_SB )
 240             msStyle |= LBS_DISABLENOSCROLL;
 241     }
 242
 243     if ( m_windowStyle & wxLB_HSCROLL )
 244         msStyle |= WS_HSCROLL;
 245     if ( m_windowStyle & wxLB_SORT )
 246         msStyle |= LBS_SORT;
 247
 248 #if wxUSE_OWNER_DRAWN && !defined(__WXWINCE__)
 249     if ( m_windowStyle & wxLB_OWNERDRAW )
 250     {
 251         // we don't support LBS_OWNERDRAWVARIABLE yet and we also always put
 252         // the strings in the listbox for simplicity even though we could have
 253         // avoided it in this case
 254         msStyle |= LBS_OWNERDRAWFIXED | LBS_HASSTRINGS;
 255     }
 256 #endif // wxUSE_OWNER_DRAWN
 257
 258     return msStyle;
 259 }
 260
 261 void wxListBox::OnInternalIdle()
 262 {
 263     wxWindow::OnInternalIdle();
 264
 265     if (m_updateHorizontalExtent)
 266     {
 267         SetHorizontalExtent(wxEmptyString);
 268         m_updateHorizontalExtent = false;
 269     }
 270 }
 271
 272 // ----------------------------------------------------------------------------
 273 // implementation of wxListBoxBase methods
 274 // ----------------------------------------------------------------------------
 275
 276 void wxListBox::DoSetFirstItem(int N)
 277 {
 278     wxCHECK_RET( IsValid(N),
 279                  wxT("invalid index in wxListBox::SetFirstItem") );
 280
 281     SendMessage(GetHwnd(), LB_SETTOPINDEX, (WPARAM)N, (LPARAM)0);
 282 }
 283
 284 void wxListBox::DoDeleteOneItem(unsigned int n)
 285 {
 286     wxCHECK_RET( IsValid(n),
 287                  wxT("invalid index in wxListBox::Delete") );
 288
 289 #if wxUSE_OWNER_DRAWN
 290     delete m_aItems[n];
 291     m_aItems.RemoveAt(n);
 292 #endif // wxUSE_OWNER_DRAWN
 293
 294     SendMessage(GetHwnd(), LB_DELETESTRING, n, 0);
 295     m_noItems--;
 296
 297     // SetHorizontalExtent(wxEmptyString); can be slow
 298     m_updateHorizontalExtent = true;
 299
 300     UpdateOldSelections();
 301 }
 302
 303 int wxListBox::FindString(const wxString& s, bool bCase) const
 304 {
 305     // back to base class search for not native search type
 306     if (bCase)
 307        return wxItemContainerImmutable::FindString( s, bCase );
 308
 309     int pos = ListBox_FindStringExact(GetHwnd(), -1, s.wx_str());
 310     if (pos == LB_ERR)
 311         return wxNOT_FOUND;
 312     else
 313         return pos;
 314 }
 315
 316 void wxListBox::DoClear()
 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     ListBox_ResetContent(GetHwnd());
 326
 327     m_noItems = 0;
 328     m_updateHorizontalExtent = true;
 329
 330     UpdateOldSelections();
 331 }
 332
 333 void wxListBox::DoSetSelection(int N, bool select)
 334 {
 335     wxCHECK_RET( N == wxNOT_FOUND || IsValid(N),
 336                  wxT("invalid index in wxListBox::SetSelection") );
 337
 338     if ( HasMultipleSelection() )
 339     {
 340         SendMessage(GetHwnd(), LB_SETSEL, select, N);
 341     }
 342     else
 343     {
 344         SendMessage(GetHwnd(), LB_SETCURSEL, select ? N : -1, 0);
 345     }
 346
 347     UpdateOldSelections();
 348 }
 349
 350 bool wxListBox::IsSelected(int N) const
 351 {
 352     wxCHECK_MSG( IsValid(N), false,
 353                  wxT("invalid index in wxListBox::Selected") );
 354
 355     return SendMessage(GetHwnd(), LB_GETSEL, N, 0) == 0 ? false : true;
 356 }
 357
 358 void *wxListBox::DoGetItemClientData(unsigned int n) const
 359 {
 360     wxCHECK_MSG( IsValid(n), NULL,
 361                  wxT("invalid index in wxListBox::GetClientData") );
 362
 363     return (void *)SendMessage(GetHwnd(), LB_GETITEMDATA, n, 0);
 364 }
 365
 366 void wxListBox::DoSetItemClientData(unsigned int n, void *clientData)
 367 {
 368     wxCHECK_RET( IsValid(n),
 369                  wxT("invalid index in wxListBox::SetClientData") );
 370
 371     if ( ListBox_SetItemData(GetHwnd(), n, clientData) == LB_ERR )
 372     {
 373         wxLogDebug(wxT("LB_SETITEMDATA failed"));
 374     }
 375 }
 376
 377 // Return number of selections and an array of selected integers
 378 int wxListBox::GetSelections(wxArrayInt& aSelections) const
 379 {
 380     aSelections.Empty();
 381
 382     if ( HasMultipleSelection() )
 383     {
 384         int countSel = ListBox_GetSelCount(GetHwnd());
 385         if ( countSel == LB_ERR )
 386         {
 387             wxLogDebug(wxT("ListBox_GetSelCount failed"));
 388         }
 389         else if ( countSel != 0 )
 390         {
 391             int *selections = new int[countSel];
 392
 393             if ( ListBox_GetSelItems(GetHwnd(),
 394                                      countSel, selections) == LB_ERR )
 395             {
 396                 wxLogDebug(wxT("ListBox_GetSelItems failed"));
 397                 countSel = -1;
 398             }
 399             else
 400             {
 401                 aSelections.Alloc(countSel);
 402                 for ( int n = 0; n < countSel; n++ )
 403                     aSelections.Add(selections[n]);
 404             }
 405
 406             delete [] selections;
 407         }
 408
 409         return countSel;
 410     }
 411     else  // single-selection listbox
 412     {
 413         if (ListBox_GetCurSel(GetHwnd()) > -1)
 414             aSelections.Add(ListBox_GetCurSel(GetHwnd()));
 415
 416         return aSelections.Count();
 417     }
 418 }
 419
 420 // Get single selection, for single choice list items
 421 int wxListBox::GetSelection() const
 422 {
 423     wxCHECK_MSG( !HasMultipleSelection(),
 424                  -1,
 425                  wxT("GetSelection() can't be used with multiple-selection listboxes, use GetSelections() instead.") );
 426
 427     return ListBox_GetCurSel(GetHwnd());
 428 }
 429
 430 // Find string for position
 431 wxString wxListBox::GetString(unsigned int n) const
 432 {
 433     wxCHECK_MSG( IsValid(n), wxEmptyString,
 434                  wxT("invalid index in wxListBox::GetString") );
 435
 436     int len = ListBox_GetTextLen(GetHwnd(), n);
 437
 438     // +1 for terminating NUL
 439     wxString result;
 440     ListBox_GetText(GetHwnd(), n, (wxChar*)wxStringBuffer(result, len + 1));
 441
 442     return result;
 443 }
 444
 445 int wxListBox::DoInsertItems(const wxArrayStringsAdapter & items,
 446                              unsigned int pos,
 447                              void **clientData,
 448                              wxClientDataType type)
 449 {
 450     MSWAllocStorage(items, LB_INITSTORAGE);
 451
 452     const bool append = pos == GetCount();
 453
 454     // we must use CB_ADDSTRING when appending as only it works correctly for
 455     // the sorted controls
 456     const unsigned msg = append ? LB_ADDSTRING : LB_INSERTSTRING;
 457
 458     if ( append )
 459         pos = 0;
 460
 461     int n = wxNOT_FOUND;
 462
 463     const unsigned int numItems = items.GetCount();
 464     for ( unsigned int i = 0; i < numItems; i++ )
 465     {
 466         n = MSWInsertOrAppendItem(pos, items[i], msg);
 467         if ( n == wxNOT_FOUND )
 468             return n;
 469
 470         if ( !append )
 471             pos++;
 472
 473         ++m_noItems;
 474
 475 #if wxUSE_OWNER_DRAWN
 476         if ( HasFlag(wxLB_OWNERDRAW) )
 477         {
 478             wxOwnerDrawn *pNewItem = CreateLboxItem(n);
 479             pNewItem->SetFont(GetFont());
 480             m_aItems.Insert(pNewItem, n);
 481         }
 482 #endif // wxUSE_OWNER_DRAWN
 483         AssignNewItemClientData(n, clientData, i, type);
 484     }
 485
 486     m_updateHorizontalExtent = true;
 487
 488     UpdateOldSelections();
 489
 490     return n;
 491 }
 492
 493 int wxListBox::DoListHitTest(const wxPoint& point) const
 494 {
 495     LRESULT lRes = ::SendMessage(GetHwnd(), LB_ITEMFROMPOINT,
 496                                  0, MAKELPARAM(point.x, point.y));
 497
 498     // non zero high-order word means that this item is outside of the client
 499     // area, IOW the point is outside of the listbox
 500     return HIWORD(lRes) ? wxNOT_FOUND : LOWORD(lRes);
 501 }
 502
 503 void wxListBox::SetString(unsigned int n, const wxString& s)
 504 {
 505     wxCHECK_RET( IsValid(n),
 506                  wxT("invalid index in wxListBox::SetString") );
 507
 508     // remember the state of the item
 509     bool wasSelected = IsSelected(n);
 510
 511     void *oldData = NULL;
 512     wxClientData *oldObjData = NULL;
 513     if ( HasClientUntypedData() )
 514         oldData = GetClientData(n);
 515     else if ( HasClientObjectData() )
 516         oldObjData = GetClientObject(n);
 517
 518     // delete and recreate it
 519     SendMessage(GetHwnd(), LB_DELETESTRING, n, 0);
 520
 521     int newN = n;
 522     if ( n == (m_noItems - 1) )
 523         newN = -1;
 524
 525     ListBox_InsertString(GetHwnd(), newN, s.wx_str());
 526
 527     // restore the client data
 528     if ( oldData )
 529         SetClientData(n, oldData);
 530     else if ( oldObjData )
 531         SetClientObject(n, oldObjData);
 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 | wxOwnerDrawn::wxODHidePrefix));
 747 }
 748
 749 #endif // wxUSE_OWNER_DRAWN
 750
 751 #endif // wxUSE_LISTBOX