src/msw/listbox.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        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 license
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 #ifdef __GNUG__
  13     #pragma implementation "listbox.h"
  14 #endif
  15
  16 // For compilers that support precompilation, includes "wx.h".
  17 #include "wx/wxprec.h"
  18
  19 #ifdef __BORLANDC__
  20     #pragma hdrstop
  21 #endif
  22
  23 #include "wx/window.h"
  24 #include "wx/msw/private.h"
  25
  26 #ifndef WX_PRECOMP
  27 #include "wx/listbox.h"
  28 #include "wx/settings.h"
  29 #include "wx/brush.h"
  30 #include "wx/font.h"
  31 #include "wx/dc.h"
  32 #include "wx/utils.h"
  33 #endif
  34
  35 #include <windowsx.h>
  36
  37 #ifdef __WXWINE__
  38   #if defined(GetWindowStyle)
  39     #undef GetWindowStyle
  40   #endif
  41 #endif
  42
  43 #include "wx/dynarray.h"
  44 #include "wx/log.h"
  45
  46 #if wxUSE_OWNER_DRAWN
  47     #include  "wx/ownerdrw.h"
  48 #endif
  49
  50 #ifndef __TWIN32__
  51     #if defined(__GNUWIN32__)
  52         #ifndef wxUSE_NORLANDER_HEADERS
  53             #include "wx/msw/gnuwin32/extra.h"
  54         #endif
  55     #endif
  56 #endif
  57
  58 #ifdef __WXWINE__
  59   #ifndef ListBox_SetItemData
  60     #define ListBox_SetItemData(hwndCtl, index, data) \
  61       ((int)(DWORD)SendMessage((hwndCtl), LB_SETITEMDATA, (WPARAM)(int)(index), (LPARAM)(data)))
  62   #endif
  63   #ifndef ListBox_GetHorizontalExtent
  64     #define ListBox_GetHorizontalExtent(hwndCtl) \
  65       ((int)(DWORD)SendMessage((hwndCtl), LB_GETHORIZONTALEXTENT, 0L, 0L))
  66   #endif
  67   #ifndef ListBox_GetSelCount
  68     #define ListBox_GetSelCount(hwndCtl) \
  69       ((int)(DWORD)SendMessage((hwndCtl), LB_GETSELCOUNT, 0L, 0L))
  70   #endif
  71   #ifndef ListBox_GetSelItems
  72     #define ListBox_GetSelItems(hwndCtl, cItems, lpItems) \
  73       ((int)(DWORD)SendMessage((hwndCtl), LB_GETSELITEMS, (WPARAM)(int)(cItems), (LPARAM)(int *)(lpItems)))
  74   #endif
  75   #ifndef ListBox_GetTextLen
  76     #define ListBox_GetTextLen(hwndCtl, index) \
  77       ((int)(DWORD)SendMessage((hwndCtl), LB_GETTEXTLEN, (WPARAM)(int)(index), 0L))
  78   #endif
  79   #ifndef ListBox_GetText
  80     #define ListBox_GetText(hwndCtl, index, lpszBuffer) \
  81       ((int)(DWORD)SendMessage((hwndCtl), LB_GETTEXT, (WPARAM)(int)(index), (LPARAM)(LPCTSTR)(lpszBuffer)))
  82   #endif
  83 #endif
  84
  85     IMPLEMENT_DYNAMIC_CLASS(wxListBox, wxControl)
  86
  87 // ============================================================================
  88 // list box item declaration and implementation
  89 // ============================================================================
  90
  91 #if wxUSE_OWNER_DRAWN
  92
  93 class wxListBoxItem : public wxOwnerDrawn
  94 {
  95 public:
  96     wxListBoxItem(const wxString& str = "");
  97 };
  98
  99 wxListBoxItem::wxListBoxItem(const wxString& str) : wxOwnerDrawn(str, FALSE)
 100 {
 101     // no bitmaps/checkmarks
 102     SetMarginWidth(0);
 103 }
 104
 105 wxOwnerDrawn *wxListBox::CreateItem(size_t n)
 106 {
 107     return new wxListBoxItem();
 108 }
 109
 110 #endif  //USE_OWNER_DRAWN
 111
 112 // ============================================================================
 113 // list box control implementation
 114 // ============================================================================
 115
 116 // ----------------------------------------------------------------------------
 117 // creation
 118 // ----------------------------------------------------------------------------
 119
 120 // Listbox item
 121 wxListBox::wxListBox()
 122 {
 123     m_noItems = 0;
 124     m_selected = 0;
 125 }
 126
 127 bool wxListBox::Create(wxWindow *parent,
 128                        wxWindowID id,
 129                        const wxPoint& pos,
 130                        const wxSize& size,
 131                        int n, const wxString choices[],
 132                        long style,
 133                        const wxValidator& validator,
 134                        const wxString& name)
 135 {
 136     m_noItems = 0;
 137     m_hWnd = 0;
 138     m_selected = 0;
 139
 140     SetName(name);
 141 #if wxUSE_VALIDATORS
 142     SetValidator(validator);
 143 #endif // wxUSE_VALIDATORS
 144
 145     if (parent)
 146         parent->AddChild(this);
 147
 148     wxSystemSettings settings;
 149     SetBackgroundColour(settings.GetSystemColour(wxSYS_COLOUR_WINDOW));
 150     SetForegroundColour(parent->GetForegroundColour());
 151
 152     m_windowId = ( id == -1 ) ? (int)NewControlId() : id;
 153
 154     int x = pos.x;
 155     int y = pos.y;
 156     int width = size.x;
 157     int height = size.y;
 158     m_windowStyle = style;
 159
 160     DWORD wstyle = WS_VISIBLE | WS_VSCROLL | WS_TABSTOP |
 161                    LBS_NOTIFY | LBS_HASSTRINGS;
 162     if (m_windowStyle & wxLB_MULTIPLE)
 163         wstyle |= LBS_MULTIPLESEL;
 164     else if (m_windowStyle & wxLB_EXTENDED)
 165         wstyle |= LBS_EXTENDEDSEL;
 166
 167     if (m_windowStyle & wxLB_ALWAYS_SB)
 168         wstyle |= LBS_DISABLENOSCROLL;
 169     if (m_windowStyle & wxLB_HSCROLL)
 170         wstyle |= WS_HSCROLL;
 171     if (m_windowStyle & wxLB_SORT)
 172         wstyle |= LBS_SORT;
 173
 174 #if wxUSE_OWNER_DRAWN
 175     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 176         // we don't support LBS_OWNERDRAWVARIABLE yet
 177         wstyle |= LBS_OWNERDRAWFIXED;
 178     }
 179 #endif
 180
 181     // Without this style, you get unexpected heights, so e.g. constraint layout
 182     // doesn't work properly
 183     wstyle |= LBS_NOINTEGRALHEIGHT;
 184
 185     bool want3D;
 186     WXDWORD exStyle = Determine3DEffects(WS_EX_CLIENTEDGE, &want3D);
 187
 188     // Even with extended styles, need to combine with WS_BORDER for them to
 189     // look right.
 190     if ( want3D || wxStyleHasBorder(m_windowStyle) )
 191     {
 192         wstyle |= WS_BORDER;
 193     }
 194
 195     m_hWnd = (WXHWND)::CreateWindowEx(exStyle, wxT("LISTBOX"), NULL,
 196             wstyle | WS_CHILD,
 197             0, 0, 0, 0,
 198             (HWND)parent->GetHWND(), (HMENU)m_windowId,
 199             wxGetInstance(), NULL);
 200
 201     wxCHECK_MSG( m_hWnd, FALSE, wxT("Failed to create listbox") );
 202
 203 #if wxUSE_CTL3D
 204     if (want3D)
 205     {
 206         Ctl3dSubclassCtl(GetHwnd());
 207         m_useCtl3D = TRUE;
 208     }
 209 #endif
 210
 211     // Subclass again to catch messages
 212     SubclassWin(m_hWnd);
 213
 214     size_t ui;
 215     for (ui = 0; ui < (size_t)n; ui++) {
 216         Append(choices[ui]);
 217     }
 218
 219     if ( (m_windowStyle & wxLB_MULTIPLE) == 0 )
 220         SendMessage(GetHwnd(), LB_SETCURSEL, 0, 0);
 221
 222     SetFont(parent->GetFont());
 223
 224     SetSize(x, y, width, height);
 225
 226     Show(TRUE);
 227
 228     return TRUE;
 229 }
 230
 231 wxListBox::~wxListBox()
 232 {
 233     Free();
 234 }
 235
 236 void wxListBox::SetupColours()
 237 {
 238     SetBackgroundColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_WINDOW));
 239     SetForegroundColour(GetParent()->GetForegroundColour());
 240 }
 241
 242 // ----------------------------------------------------------------------------
 243 // implementation of wxListBoxBase methods
 244 // ----------------------------------------------------------------------------
 245
 246 void wxListBox::DoSetFirstItem(int N)
 247 {
 248     wxCHECK_RET( N >= 0 && N < m_noItems,
 249                  wxT("invalid index in wxListBox::SetFirstItem") );
 250
 251     SendMessage(GetHwnd(), LB_SETTOPINDEX, (WPARAM)N, (LPARAM)0);
 252 }
 253
 254 void wxListBox::Delete(int N)
 255 {
 256     wxCHECK_RET( N >= 0 && N < m_noItems,
 257                  wxT("invalid index in wxListBox::Delete") );
 258
 259     // for owner drawn objects, the data is used for storing wxOwnerDrawn
 260     // pointers and we shouldn't touch it
 261 #if !wxUSE_OWNER_DRAWN
 262     if ( !(m_windowStyle & wxLB_OWNERDRAW) )
 263 #endif // !wxUSE_OWNER_DRAWN
 264         if ( HasClientObjectData() )
 265         {
 266             delete GetClientObject(N);
 267         }
 268
 269     SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);
 270     m_noItems--;
 271
 272     SetHorizontalExtent("");
 273 }
 274
 275 int wxListBox::DoAppend(const wxString& item)
 276 {
 277     int index = ListBox_AddString(GetHwnd(), item);
 278     m_noItems++;
 279
 280 #if wxUSE_OWNER_DRAWN
 281     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 282         wxOwnerDrawn *pNewItem = CreateItem(index); // dummy argument
 283         pNewItem->SetName(item);
 284         m_aItems.Add(pNewItem);
 285         ListBox_SetItemData(GetHwnd(), index, pNewItem);
 286         pNewItem->SetFont(GetFont());
 287     }
 288 #endif
 289
 290     SetHorizontalExtent(item);
 291
 292     return index;
 293 }
 294
 295 void wxListBox::DoSetItems(const wxArrayString& choices, void** clientData)
 296 {
 297     ShowWindow(GetHwnd(), SW_HIDE);
 298
 299     ListBox_ResetContent(GetHwnd());
 300
 301     m_noItems = choices.GetCount();
 302     int i;
 303     for (i = 0; i < m_noItems; i++)
 304     {
 305         ListBox_AddString(GetHwnd(), choices[i]);
 306         if ( clientData )
 307         {
 308 #if wxUSE_OWNER_DRAWN
 309             wxASSERT_MSG(clientData[i] == NULL,
 310                          wxT("Can't use client data with owner-drawn listboxes"));
 311 #else // !wxUSE_OWNER_DRAWN
 312             ListBox_SetItemData(GetHwnd(), i, clientData[i]);
 313 #endif // wxUSE_OWNER_DRAWN/!wxUSE_OWNER_DRAWN
 314         }
 315     }
 316
 317 #if wxUSE_OWNER_DRAWN
 318     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 319         // first delete old items
 320         size_t ui = m_aItems.Count();
 321         while ( ui-- != 0 ) {
 322             delete m_aItems[ui];
 323         }
 324         m_aItems.Empty();
 325
 326         // then create new ones
 327         for ( ui = 0; ui < (size_t)m_noItems; ui++ ) {
 328             wxOwnerDrawn *pNewItem = CreateItem(ui);
 329             pNewItem->SetName(choices[ui]);
 330             m_aItems.Add(pNewItem);
 331             ListBox_SetItemData(GetHwnd(), ui, pNewItem);
 332         }
 333     }
 334 #endif // wxUSE_OWNER_DRAWN
 335
 336     SetHorizontalExtent();
 337
 338     ShowWindow(GetHwnd(), SW_SHOW);
 339 }
 340
 341 int wxListBox::FindString(const wxString& s) const
 342 {
 343     int pos = ListBox_FindStringExact(GetHwnd(), (WPARAM)-1, s);
 344     if (pos == LB_ERR)
 345         return wxNOT_FOUND;
 346     else
 347         return pos;
 348 }
 349
 350 void wxListBox::Clear()
 351 {
 352     Free();
 353
 354     ListBox_ResetContent(GetHwnd());
 355
 356     m_noItems = 0;
 357     SetHorizontalExtent();
 358 }
 359
 360 void wxListBox::Free()
 361 {
 362 #if wxUSE_OWNER_DRAWN
 363     if ( m_windowStyle & wxLB_OWNERDRAW )
 364     {
 365         size_t uiCount = m_aItems.Count();
 366         while ( uiCount-- != 0 ) {
 367             delete m_aItems[uiCount];
 368         }
 369
 370         m_aItems.Clear();
 371     }
 372     else
 373 #endif // wxUSE_OWNER_DRAWN
 374     if ( HasClientObjectData() )
 375     {
 376         for ( size_t n = 0; n < (size_t)m_noItems; n++ )
 377         {
 378             delete GetClientObject(n);
 379         }
 380     }
 381 }
 382
 383 void wxListBox::SetSelection(int N, bool select)
 384 {
 385     wxCHECK_RET( N >= 0 && N < m_noItems,
 386                  wxT("invalid index in wxListBox::SetSelection") );
 387
 388     if ( HasMultipleSelection() )
 389     {
 390         SendMessage(GetHwnd(), LB_SETSEL, select, N);
 391     }
 392     else
 393     {
 394         SendMessage(GetHwnd(), LB_SETCURSEL, select ? N : -1, 0);
 395     }
 396 }
 397
 398 bool wxListBox::IsSelected(int N) const
 399 {
 400     wxCHECK_MSG( N >= 0 && N < m_noItems, FALSE,
 401                  wxT("invalid index in wxListBox::Selected") );
 402
 403     return SendMessage(GetHwnd(), LB_GETSEL, N, 0) == 0 ? FALSE : TRUE;
 404 }
 405
 406 wxClientData* wxListBox::DoGetItemClientObject(int n) const
 407 {
 408     return (wxClientData *)DoGetItemClientData(n);
 409 }
 410
 411 void *wxListBox::DoGetItemClientData(int n) const
 412 {
 413     wxCHECK_MSG( n >= 0 && n < m_noItems, NULL,
 414                  wxT("invalid index in wxListBox::GetClientData") );
 415
 416     return (void *)SendMessage(GetHwnd(), LB_GETITEMDATA, n, 0);
 417 }
 418
 419 void wxListBox::DoSetItemClientObject(int n, wxClientData* clientData)
 420 {
 421     DoSetItemClientData(n, clientData);
 422 }
 423
 424 void wxListBox::DoSetItemClientData(int n, void *clientData)
 425 {
 426     wxCHECK_RET( n >= 0 && n < m_noItems,
 427                  wxT("invalid index in wxListBox::SetClientData") );
 428
 429 #if wxUSE_OWNER_DRAWN
 430     if ( m_windowStyle & wxLB_OWNERDRAW )
 431     {
 432         // client data must be pointer to wxOwnerDrawn, otherwise we would crash
 433         // in OnMeasure/OnDraw.
 434         wxFAIL_MSG(wxT("Can't use client data with owner-drawn listboxes"));
 435     }
 436 #endif // wxUSE_OWNER_DRAWN
 437
 438     if ( ListBox_SetItemData(GetHwnd(), n, clientData) == LB_ERR )
 439         wxLogDebug(wxT("LB_SETITEMDATA failed"));
 440 }
 441
 442 bool wxListBox::HasMultipleSelection() const
 443 {
 444     return (m_windowStyle & wxLB_MULTIPLE) || (m_windowStyle & wxLB_EXTENDED);
 445 }
 446
 447 // Return number of selections and an array of selected integers
 448 int wxListBox::GetSelections(wxArrayInt& aSelections) const
 449 {
 450     aSelections.Empty();
 451
 452     if ( HasMultipleSelection() )
 453     {
 454         int no_sel = ListBox_GetSelCount(GetHwnd());
 455         if (no_sel != 0) {
 456             int *selections = new int[no_sel];
 457             int rc = ListBox_GetSelItems(GetHwnd(), no_sel, selections);
 458
 459             wxCHECK_MSG(rc != LB_ERR, -1, wxT("ListBox_GetSelItems failed"));
 460
 461             aSelections.Alloc(no_sel);
 462             for ( int n = 0; n < no_sel; n++ )
 463                 aSelections.Add(selections[n]);
 464
 465             delete [] selections;
 466         }
 467
 468         return no_sel;
 469     }
 470     else  // single-selection listbox
 471     {
 472         aSelections.Add(ListBox_GetCurSel(GetHwnd()));
 473
 474         return 1;
 475     }
 476 }
 477
 478 // Get single selection, for single choice list items
 479 int wxListBox::GetSelection() const
 480 {
 481     wxCHECK_MSG( !HasMultipleSelection(),
 482                  -1,
 483                  wxT("GetSelection() can't be used with multiple-selection "
 484                     "listboxes, use GetSelections() instead.") );
 485
 486     return ListBox_GetCurSel(GetHwnd());
 487 }
 488
 489 // Find string for position
 490 wxString wxListBox::GetString(int N) const
 491 {
 492     wxCHECK_MSG( N >= 0 && N < m_noItems, "",
 493                  wxT("invalid index in wxListBox::GetClientData") );
 494
 495     int len = ListBox_GetTextLen(GetHwnd(), N);
 496
 497     // +1 for terminating NUL
 498     wxString result;
 499     ListBox_GetText(GetHwnd(), N, result.GetWriteBuf(len + 1));
 500     result.UngetWriteBuf();
 501
 502     return result;
 503 }
 504
 505 void
 506 wxListBox::DoInsertItems(const wxArrayString& items, int pos)
 507 {
 508     wxCHECK_RET( pos >= 0 && pos <= m_noItems,
 509                  wxT("invalid index in wxListBox::InsertItems") );
 510
 511     int nItems = items.GetCount();
 512     for ( int i = 0; i < nItems; i++ )
 513         ListBox_InsertString(GetHwnd(), i + pos, items[i]);
 514     m_noItems += nItems;
 515
 516     SetHorizontalExtent();
 517 }
 518
 519 void wxListBox::SetString(int N, const wxString& s)
 520 {
 521     wxCHECK_RET( N >= 0 && N < m_noItems,
 522                  wxT("invalid index in wxListBox::SetString") );
 523
 524     // remember the state of the item
 525     bool wasSelected = IsSelected(N);
 526
 527     void *oldData = NULL;
 528     wxClientData *oldObjData = NULL;
 529     if ( m_clientDataItemsType == ClientData_Void )
 530         oldData = GetClientData(N);
 531     else if ( m_clientDataItemsType == ClientData_Object )
 532         oldObjData = GetClientObject(N);
 533
 534     // delete and recreate it
 535     SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);
 536
 537     int newN = N;
 538     if ( N == m_noItems - 1 )
 539         newN = -1;
 540
 541     ListBox_InsertString(GetHwnd(), newN, s);
 542
 543     // restore the client data
 544     if ( oldData )
 545         SetClientData(N, oldData);
 546     else if ( oldObjData )
 547         SetClientObject(N, oldObjData);
 548
 549     // we may have lost the selection
 550     if ( wasSelected )
 551         Select(N);
 552
 553 #if wxUSE_OWNER_DRAWN
 554     if ( m_windowStyle & wxLB_OWNERDRAW )
 555         // update item's text
 556         m_aItems[N]->SetName(s);
 557 #endif  //USE_OWNER_DRAWN
 558 }
 559
 560 int wxListBox::GetCount() const
 561 {
 562     return m_noItems;
 563 }
 564
 565 // ----------------------------------------------------------------------------
 566 // helpers
 567 // ----------------------------------------------------------------------------
 568
 569 // Windows-specific code to set the horizontal extent of the listbox, if
 570 // necessary. If s is non-NULL, it's used to calculate the horizontal extent.
 571 // Otherwise, all strings are used.
 572 void wxListBox::SetHorizontalExtent(const wxString& s)
 573 {
 574     // Only necessary if we want a horizontal scrollbar
 575     if (!(m_windowStyle & wxHSCROLL))
 576         return;
 577     TEXTMETRIC lpTextMetric;
 578
 579     if ( !s.IsEmpty() )
 580     {
 581         int existingExtent = (int)SendMessage(GetHwnd(), LB_GETHORIZONTALEXTENT, 0, 0L);
 582         HDC dc = GetWindowDC(GetHwnd());
 583         HFONT oldFont = 0;
 584         if (GetFont().Ok() && GetFont().GetResourceHandle())
 585             oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
 586
 587         GetTextMetrics(dc, &lpTextMetric);
 588         SIZE extentXY;
 589         ::GetTextExtentPoint(dc, (LPTSTR) (const wxChar *)s, s.Length(), &extentXY);
 590         int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 591
 592         if (oldFont)
 593             ::SelectObject(dc, oldFont);
 594
 595         ReleaseDC(GetHwnd(), dc);
 596         if (extentX > existingExtent)
 597             SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(extentX), 0L);
 598     }
 599     else
 600     {
 601         int largestExtent = 0;
 602         HDC dc = GetWindowDC(GetHwnd());
 603         HFONT oldFont = 0;
 604         if (GetFont().Ok() && GetFont().GetResourceHandle())
 605             oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
 606
 607         GetTextMetrics(dc, &lpTextMetric);
 608         int i;
 609         for (i = 0; i < m_noItems; i++)
 610         {
 611             int len = (int)SendMessage(GetHwnd(), LB_GETTEXT, i, (LONG)wxBuffer);
 612             wxBuffer[len] = 0;
 613             SIZE extentXY;
 614             ::GetTextExtentPoint(dc, (LPTSTR)wxBuffer, len, &extentXY);
 615             int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 616             if (extentX > largestExtent)
 617                 largestExtent = extentX;
 618         }
 619         if (oldFont)
 620             ::SelectObject(dc, oldFont);
 621
 622         ReleaseDC(GetHwnd(), dc);
 623         SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(largestExtent), 0L);
 624     }
 625 }
 626
 627 wxSize wxListBox::DoGetBestSize() const
 628 {
 629     // find the widest string
 630     int wLine;
 631     int wListbox = 0;
 632     for ( int i = 0; i < m_noItems; i++ )
 633     {
 634         wxString str(GetString(i));
 635         GetTextExtent(str, &wLine, NULL);
 636         if ( wLine > wListbox )
 637             wListbox = wLine;
 638     }
 639
 640     // give it some reasonable default value if there are no strings in the
 641     // list
 642     if ( wListbox == 0 )
 643         wListbox = 100;
 644
 645     // the listbox should be slightly larger than the widest string
 646     int cx, cy;
 647     wxGetCharSize(GetHWND(), &cx, &cy, &GetFont());
 648
 649     wListbox += 3*cx;
 650
 651     int hListbox = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy)*(wxMax(m_noItems, 7));
 652
 653     return wxSize(wListbox, hListbox);
 654 }
 655
 656 // ----------------------------------------------------------------------------
 657 // callbacks
 658 // ----------------------------------------------------------------------------
 659
 660 bool wxListBox::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 661 {
 662     if ( param == LBN_SELCHANGE )
 663     {
 664         wxCommandEvent event(wxEVT_COMMAND_LISTBOX_SELECTED, m_windowId);
 665         event.SetEventObject( this );
 666
 667         wxArrayInt aSelections;
 668         int n, count = GetSelections(aSelections);
 669         if ( count > 0 )
 670         {
 671             n = aSelections[0];
 672             if ( HasClientObjectData() )
 673                 event.SetClientObject( GetClientObject(n) );
 674             else if ( HasClientUntypedData() )
 675                 event.SetClientData( GetClientData(n) );
 676             event.SetString( GetString(n) );
 677         }
 678         else
 679         {
 680             n = -1;
 681         }
 682
 683         event.m_commandInt = n;
 684
 685         return GetEventHandler()->ProcessEvent(event);
 686     }
 687     else if ( param == LBN_DBLCLK )
 688     {
 689         wxCommandEvent event(wxEVT_COMMAND_LISTBOX_DOUBLECLICKED, m_windowId);
 690         event.SetEventObject( this );
 691
 692         return GetEventHandler()->ProcessEvent(event);
 693     }
 694     //else:
 695
 696     return FALSE;
 697 }
 698
 699 // ----------------------------------------------------------------------------
 700 // wxCheckListBox support
 701 // ----------------------------------------------------------------------------
 702
 703 #if wxUSE_OWNER_DRAWN
 704
 705 // drawing
 706 // -------
 707
 708 // space beneath/above each row in pixels
 709 // "standard" checklistbox use 1 here, some might prefer 2. 0 is ugly.
 710 #define OWNER_DRAWN_LISTBOX_EXTRA_SPACE    (1)
 711
 712 // the height is the same for all items
 713 // TODO should be changed for LBS_OWNERDRAWVARIABLE style listboxes
 714
 715 // NB: can't forward this to wxListBoxItem because LB_SETITEMDATA
 716 //     message is not yet sent when we get here!
 717 bool wxListBox::MSWOnMeasure(WXMEASUREITEMSTRUCT *item)
 718 {
 719     // only owner-drawn control should receive this message
 720     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), FALSE );
 721
 722     MEASUREITEMSTRUCT *pStruct = (MEASUREITEMSTRUCT *)item;
 723
 724     HDC hdc = CreateIC(wxT("DISPLAY"), NULL, NULL, 0);
 725
 726     wxDC dc;
 727     dc.SetHDC((WXHDC)hdc);
 728     dc.SetFont(wxSystemSettings::GetSystemFont(wxSYS_ANSI_VAR_FONT));
 729
 730     pStruct->itemHeight = dc.GetCharHeight() + 2*OWNER_DRAWN_LISTBOX_EXTRA_SPACE;
 731     pStruct->itemWidth  = dc.GetCharWidth();
 732
 733     dc.SetHDC(0);
 734
 735     DeleteDC(hdc);
 736
 737     return TRUE;
 738 }
 739
 740 // forward the message to the appropriate item
 741 bool wxListBox::MSWOnDraw(WXDRAWITEMSTRUCT *item)
 742 {
 743     // only owner-drawn control should receive this message
 744     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), FALSE );
 745
 746     DRAWITEMSTRUCT *pStruct = (DRAWITEMSTRUCT *)item;
 747
 748     long data = ListBox_GetItemData(GetHwnd(), pStruct->itemID);
 749
 750     wxCHECK( data && (data != LB_ERR), FALSE );
 751
 752     wxListBoxItem *pItem = (wxListBoxItem *)data;
 753
 754     wxDC dc;
 755     dc.SetHDC((WXHDC)pStruct->hDC, FALSE);
 756     wxRect rect(wxPoint(pStruct->rcItem.left, pStruct->rcItem.top),
 757             wxPoint(pStruct->rcItem.right, pStruct->rcItem.bottom));
 758
 759     return pItem->OnDrawItem(dc, rect,
 760             (wxOwnerDrawn::wxODAction)pStruct->itemAction,
 761             (wxOwnerDrawn::wxODStatus)pStruct->itemState);
 762 }
 763
 764 #endif
 765     // wxUSE_OWNER_DRAWN