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 #endif
  33
  34 #include <windowsx.h>
  35
  36 #ifdef __WXWINE__
  37   #if defined(GetWindowStyle)
  38     #undef GetWindowStyle
  39   #endif
  40 #endif
  41
  42 #include "wx/dynarray.h"
  43 #include "wx/log.h"
  44
  45 #if wxUSE_OWNER_DRAWN
  46     #include  "wx/ownerdrw.h"
  47 #endif
  48
  49 #ifndef __TWIN32__
  50     #if defined(__GNUWIN32__)
  51         #include <wx/msw/gnuwin32/extra.h>
  52     #endif
  53 #endif
  54
  55 #ifdef __WXWINE__
  56   #ifndef ListBox_SetItemData
  57     #define ListBox_SetItemData(hwndCtl, index, data) \
  58       ((int)(DWORD)SendMessage((hwndCtl), LB_SETITEMDATA, (WPARAM)(int)(index), (LPARAM)(data)))
  59   #endif
  60   #ifndef ListBox_GetHorizontalExtent
  61     #define ListBox_GetHorizontalExtent(hwndCtl) \
  62       ((int)(DWORD)SendMessage((hwndCtl), LB_GETHORIZONTALEXTENT, 0L, 0L))
  63   #endif
  64   #ifndef ListBox_GetSelCount
  65     #define ListBox_GetSelCount(hwndCtl) \
  66       ((int)(DWORD)SendMessage((hwndCtl), LB_GETSELCOUNT, 0L, 0L))
  67   #endif
  68   #ifndef ListBox_GetSelItems
  69     #define ListBox_GetSelItems(hwndCtl, cItems, lpItems) \
  70       ((int)(DWORD)SendMessage((hwndCtl), LB_GETSELITEMS, (WPARAM)(int)(cItems), (LPARAM)(int *)(lpItems)))
  71   #endif
  72   #ifndef ListBox_GetTextLen
  73     #define ListBox_GetTextLen(hwndCtl, index) \
  74       ((int)(DWORD)SendMessage((hwndCtl), LB_GETTEXTLEN, (WPARAM)(int)(index), 0L))
  75   #endif
  76   #ifndef ListBox_GetText
  77     #define ListBox_GetText(hwndCtl, index, lpszBuffer) \
  78       ((int)(DWORD)SendMessage((hwndCtl), LB_GETTEXT, (WPARAM)(int)(index), (LPARAM)(LPCTSTR)(lpszBuffer)))
  79   #endif
  80 #endif
  81
  82 #if !USE_SHARED_LIBRARY
  83     IMPLEMENT_DYNAMIC_CLASS(wxListBox, wxControl)
  84 #endif
  85
  86 // ============================================================================
  87 // list box item declaration and implementation
  88 // ============================================================================
  89
  90 #if wxUSE_OWNER_DRAWN
  91
  92 class wxListBoxItem : public wxOwnerDrawn
  93 {
  94 public:
  95     wxListBoxItem(const wxString& str = "");
  96 };
  97
  98 wxListBoxItem::wxListBoxItem(const wxString& str) : wxOwnerDrawn(str, FALSE)
  99 {
 100     // no bitmaps/checkmarks
 101     SetMarginWidth(0);
 102 }
 103
 104 wxOwnerDrawn *wxListBox::CreateItem(size_t n)
 105 {
 106     return new wxListBoxItem();
 107 }
 108
 109 #endif  //USE_OWNER_DRAWN
 110
 111 // ============================================================================
 112 // list box control implementation
 113 // ============================================================================
 114
 115 bool wxListBox::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 116 {
 117     /*
 118        if (param == LBN_SELCANCEL)
 119        {
 120        event.extraLong = FALSE;
 121        }
 122      */
 123     if (param == LBN_SELCHANGE)
 124     {
 125         wxCommandEvent event(wxEVT_COMMAND_LISTBOX_SELECTED, m_windowId);
 126         wxArrayInt aSelections;
 127         int count = GetSelections(aSelections);
 128         if ( count > 0 )
 129         {
 130             event.m_commandInt = aSelections[0] ;
 131             event.m_clientData = GetClientData(event.m_commandInt);
 132             wxString str(GetString(event.m_commandInt));
 133             if (str != _T(""))
 134             {
 135                 event.m_commandString = str;
 136             }
 137         }
 138         else
 139         {
 140             event.m_commandInt = -1 ;
 141             event.m_commandString.Empty();
 142         }
 143
 144         event.SetEventObject( this );
 145         ProcessCommand(event);
 146         return TRUE;
 147     }
 148     else if (param == LBN_DBLCLK)
 149     {
 150         wxCommandEvent event(wxEVT_COMMAND_LISTBOX_DOUBLECLICKED, m_windowId);
 151         event.SetEventObject( this );
 152         GetEventHandler()->ProcessEvent(event) ;
 153         return TRUE;
 154     }
 155
 156     return FALSE;
 157 }
 158
 159     // Listbox item
 160 wxListBox::wxListBox()
 161 {
 162     m_noItems = 0;
 163     m_selected = 0;
 164 }
 165
 166 bool wxListBox::Create(wxWindow *parent,
 167                        wxWindowID id,
 168                        const wxPoint& pos,
 169                        const wxSize& size,
 170                        int n, const wxString choices[],
 171                        long style,
 172                        const wxValidator& validator,
 173                        const wxString& name)
 174 {
 175     m_noItems = 0;
 176     m_hWnd = 0;
 177     m_selected = 0;
 178
 179     SetName(name);
 180     SetValidator(validator);
 181
 182     if (parent)
 183         parent->AddChild(this);
 184
 185     wxSystemSettings settings;
 186     SetBackgroundColour(settings.GetSystemColour(wxSYS_COLOUR_WINDOW));
 187     SetForegroundColour(parent->GetForegroundColour());
 188
 189     m_windowId = ( id == -1 ) ? (int)NewControlId() : id;
 190
 191     int x = pos.x;
 192     int y = pos.y;
 193     int width = size.x;
 194     int height = size.y;
 195     m_windowStyle = style;
 196
 197     DWORD wstyle = WS_VISIBLE | WS_VSCROLL | WS_TABSTOP |
 198                    LBS_NOTIFY | LBS_HASSTRINGS;
 199     if (m_windowStyle & wxLB_MULTIPLE)
 200         wstyle |= LBS_MULTIPLESEL;
 201     else if (m_windowStyle & wxLB_EXTENDED)
 202         wstyle |= LBS_EXTENDEDSEL;
 203
 204     if (m_windowStyle & wxLB_ALWAYS_SB)
 205         wstyle |= LBS_DISABLENOSCROLL ;
 206     if (m_windowStyle & wxLB_HSCROLL)
 207         wstyle |= WS_HSCROLL;
 208     if (m_windowStyle & wxLB_SORT)
 209         wstyle |= LBS_SORT;
 210
 211 #if wxUSE_OWNER_DRAWN
 212     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 213         // we don't support LBS_OWNERDRAWVARIABLE yet
 214         wstyle |= LBS_OWNERDRAWFIXED;
 215     }
 216 #endif
 217
 218     // Without this style, you get unexpected heights, so e.g. constraint layout
 219     // doesn't work properly
 220     wstyle |= LBS_NOINTEGRALHEIGHT;
 221
 222     bool want3D;
 223     WXDWORD exStyle = Determine3DEffects(WS_EX_CLIENTEDGE, &want3D) ;
 224
 225     // Even with extended styles, need to combine with WS_BORDER
 226     // for them to look right.
 227     if ( want3D || wxStyleHasBorder(m_windowStyle) )
 228     {
 229         wstyle |= WS_BORDER;
 230     }
 231
 232     m_hWnd = (WXHWND)::CreateWindowEx(exStyle, _T("LISTBOX"), NULL,
 233             wstyle | WS_CHILD,
 234             0, 0, 0, 0,
 235             (HWND)parent->GetHWND(), (HMENU)m_windowId,
 236             wxGetInstance(), NULL);
 237
 238     wxCHECK_MSG( m_hWnd, FALSE, _T("Failed to create listbox") );
 239
 240 #if wxUSE_CTL3D
 241     if (want3D)
 242     {
 243         Ctl3dSubclassCtl(GetHwnd());
 244         m_useCtl3D = TRUE;
 245     }
 246 #endif
 247
 248     // Subclass again to catch messages
 249     SubclassWin(m_hWnd);
 250
 251     size_t ui;
 252     for (ui = 0; ui < (size_t)n; ui++) {
 253         Append(choices[ui]);
 254     }
 255
 256     if ( (m_windowStyle & wxLB_MULTIPLE) == 0 )
 257         SendMessage(GetHwnd(), LB_SETCURSEL, 0, 0);
 258
 259     SetFont(parent->GetFont());
 260
 261     SetSize(x, y, width, height);
 262
 263     Show(TRUE);
 264
 265     return TRUE;
 266 }
 267
 268 wxListBox::~wxListBox()
 269 {
 270 #if wxUSE_OWNER_DRAWN
 271     size_t uiCount = m_aItems.Count();
 272     while ( uiCount-- != 0 ) {
 273         delete m_aItems[uiCount];
 274     }
 275 #endif // wxUSE_OWNER_DRAWN
 276 }
 277
 278 void wxListBox::SetupColours()
 279 {
 280     SetBackgroundColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_WINDOW));
 281     SetForegroundColour(GetParent()->GetForegroundColour());
 282 }
 283
 284 void wxListBox::SetFirstItem(int N)
 285 {
 286     wxCHECK_RET( N >= 0 && N < m_noItems,
 287                  _T("invalid index in wxListBox::SetFirstItem") );
 288
 289     SendMessage(GetHwnd(),LB_SETTOPINDEX,(WPARAM)N,(LPARAM)0) ;
 290 }
 291
 292 void wxListBox::SetFirstItem(const wxString& s)
 293 {
 294     int N = FindString(s) ;
 295
 296     if ( N >= 0 )
 297         SetFirstItem(N) ;
 298 }
 299
 300 void wxListBox::Delete(int N)
 301 {
 302     wxCHECK_RET( N >= 0 && N < m_noItems,
 303                  _T("invalid index in wxListBox::Delete") );
 304
 305     SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);
 306     m_noItems--;
 307
 308     SetHorizontalExtent("");
 309 }
 310
 311 void wxListBox::Append(const wxString& item)
 312 {
 313     int index = ListBox_AddString(GetHwnd(), item);
 314     m_noItems ++;
 315
 316 #if wxUSE_OWNER_DRAWN
 317     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 318         wxOwnerDrawn *pNewItem = CreateItem(index); // dummy argument
 319         pNewItem->SetName(item);
 320         m_aItems.Add(pNewItem);
 321         ListBox_SetItemData(GetHwnd(), index, pNewItem);
 322     }
 323 #endif
 324
 325     SetHorizontalExtent(item);
 326 }
 327
 328 void wxListBox::Append(const wxString& item, void *Client_data)
 329 {
 330     int index = ListBox_AddString(GetHwnd(), item);
 331     m_noItems ++;
 332
 333 #if wxUSE_OWNER_DRAWN
 334     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 335         // client data must be pointer to wxOwnerDrawn, otherwise we would crash
 336         // in OnMeasure/OnDraw.
 337         wxFAIL_MSG(_T("Can't use client data with owner-drawn listboxes"));
 338     }
 339     else
 340 #endif
 341
 342     ListBox_SetItemData(GetHwnd(), index, Client_data);
 343
 344     SetHorizontalExtent(item);
 345 }
 346
 347 void wxListBox::Set(int n, const wxString *choices, void** clientData)
 348 {
 349     ShowWindow(GetHwnd(), SW_HIDE);
 350     ListBox_ResetContent(GetHwnd());
 351     int i;
 352     for (i = 0; i < n; i++)
 353     {
 354         ListBox_AddString(GetHwnd(), choices[i]);
 355         if ( clientData )
 356             ListBox_SetItemData(GetHwnd(), i, clientData[i]);
 357     }
 358     m_noItems = n;
 359
 360 #if wxUSE_OWNER_DRAWN
 361     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 362         // first delete old items
 363         size_t ui = m_aItems.Count();
 364         while ( ui-- != 0 ) {
 365             delete m_aItems[ui];
 366         }
 367         m_aItems.Empty();
 368
 369         // then create new ones
 370         for (ui = 0; ui < (size_t)n; ui++) {
 371             wxOwnerDrawn *pNewItem = CreateItem(ui);
 372             pNewItem->SetName(choices[ui]);
 373             m_aItems.Add(pNewItem);
 374             ListBox_SetItemData(GetHwnd(), ui, pNewItem);
 375
 376             wxASSERT_MSG(clientData[ui] == NULL,
 377                     _T("Can't use client data with owner-drawn listboxes"));
 378         }
 379     }
 380 #endif
 381
 382     SetHorizontalExtent("");
 383     ShowWindow(GetHwnd(), SW_SHOW);
 384 }
 385
 386 int wxListBox::FindString(const wxString& s) const
 387 {
 388     int pos = ListBox_FindStringExact(GetHwnd(), (WPARAM)-1, s);
 389     if (pos == LB_ERR)
 390         return -1;
 391     else
 392         return pos;
 393 }
 394
 395 void wxListBox::Clear()
 396 {
 397     ListBox_ResetContent(GetHwnd());
 398
 399 #if wxUSE_OWNER_DRAWN
 400     size_t uiCount = m_aItems.Count();
 401     while ( uiCount-- != 0 ) {
 402         delete m_aItems[uiCount];
 403     }
 404
 405     m_aItems.Clear();
 406 #endif // wxUSE_OWNER_DRAWN
 407
 408     m_noItems = 0;
 409     ListBox_GetHorizontalExtent(GetHwnd());
 410 }
 411
 412 void wxListBox::SetSelection(int N, bool select)
 413 {
 414     wxCHECK_RET( N >= 0 && N < m_noItems,
 415                  _T("invalid index in wxListBox::SetSelection") );
 416
 417     if ((m_windowStyle & wxLB_MULTIPLE) || (m_windowStyle & wxLB_EXTENDED))
 418         SendMessage(GetHwnd(), LB_SETSEL, select, N);
 419     else
 420     {
 421         int N1 = N;
 422         if (!select)
 423             N1 = -1;
 424         SendMessage(GetHwnd(), LB_SETCURSEL, N1, 0);
 425     }
 426 }
 427
 428 bool wxListBox::Selected(int N) const
 429 {
 430     wxCHECK_MSG( N >= 0 && N < m_noItems, FALSE,
 431                  _T("invalid index in wxListBox::Selected") );
 432
 433     return SendMessage(GetHwnd(), LB_GETSEL, N, 0) == 0 ? FALSE : TRUE;
 434 }
 435
 436 void wxListBox::Deselect(int N)
 437 {
 438     wxCHECK_RET( N >= 0 && N < m_noItems,
 439                  _T("invalid index in wxListBox::Deselect") );
 440
 441     if ((m_windowStyle & wxLB_MULTIPLE) || (m_windowStyle & wxLB_EXTENDED))
 442         SendMessage(GetHwnd(), LB_SETSEL, FALSE, N);
 443 }
 444
 445 void *wxListBox::GetClientData(int N) const
 446 {
 447     wxCHECK_MSG( N >= 0 && N < m_noItems, NULL,
 448                  _T("invalid index in wxListBox::GetClientData") );
 449
 450     return (void *)SendMessage(GetHwnd(), LB_GETITEMDATA, N, 0);
 451 }
 452
 453 void wxListBox::SetClientData(int N, void *Client_data)
 454 {
 455     wxCHECK_RET( N >= 0 && N < m_noItems,
 456                  _T("invalid index in wxListBox::SetClientData") );
 457
 458     if ( ListBox_SetItemData(GetHwnd(), N, Client_data) == LB_ERR )
 459         wxLogDebug(_T("LB_SETITEMDATA failed"));
 460 }
 461
 462 // Return number of selections and an array of selected integers
 463 int wxListBox::GetSelections(wxArrayInt& aSelections) const
 464 {
 465     aSelections.Empty();
 466
 467     if ((m_windowStyle & wxLB_MULTIPLE) || (m_windowStyle & wxLB_EXTENDED))
 468     {
 469         int no_sel = ListBox_GetSelCount(GetHwnd());
 470         if (no_sel != 0) {
 471             int *selections = new int[no_sel];
 472             if ( ListBox_GetSelItems(GetHwnd(), no_sel, selections) == LB_ERR ) {
 473                 wxFAIL_MSG(_T("This listbox can't have single-selection style!"));
 474             }
 475
 476             aSelections.Alloc(no_sel);
 477             for ( int n = 0; n < no_sel; n++ )
 478                 aSelections.Add(selections[n]);
 479
 480             delete [] selections;
 481         }
 482
 483         return no_sel;
 484     }
 485     else  // single-selection listbox
 486     {
 487         aSelections.Add(ListBox_GetCurSel(GetHwnd()));
 488
 489         return 1;
 490     }
 491 }
 492
 493 // Get single selection, for single choice list items
 494 int wxListBox::GetSelection() const
 495 {
 496     wxCHECK_MSG( !(m_windowStyle & wxLB_MULTIPLE) &&
 497                  !(m_windowStyle & wxLB_EXTENDED),
 498                  -1,
 499                  _T("GetSelection() can't be used with multiple-selection "
 500                     "listboxes, use GetSelections() instead.") );
 501
 502     return ListBox_GetCurSel(GetHwnd());
 503 }
 504
 505 // Find string for position
 506 wxString wxListBox::GetString(int N) const
 507 {
 508     wxCHECK_MSG( N >= 0 && N < m_noItems, "",
 509                  _T("invalid index in wxListBox::GetClientData") );
 510
 511     int len = ListBox_GetTextLen(GetHwnd(), N);
 512
 513     // +1 for terminating NUL
 514     wxString result;
 515     ListBox_GetText(GetHwnd(), N, result.GetWriteBuf(len + 1));
 516     result.UngetWriteBuf();
 517
 518     return result;
 519 }
 520
 521 // Windows-specific code to set the horizontal extent of the listbox, if
 522 // necessary. If s is non-NULL, it's used to calculate the horizontal extent.
 523 // Otherwise, all strings are used.
 524 void wxListBox::SetHorizontalExtent(const wxString& s)
 525 {
 526     // Only necessary if we want a horizontal scrollbar
 527     if (!(m_windowStyle & wxHSCROLL))
 528         return;
 529     TEXTMETRIC lpTextMetric;
 530
 531     if (s != _T(""))
 532     {
 533         int existingExtent = (int)SendMessage(GetHwnd(), LB_GETHORIZONTALEXTENT, 0, 0L);
 534         HDC dc = GetWindowDC(GetHwnd());
 535         HFONT oldFont = 0;
 536         if (GetFont().Ok() && GetFont().GetResourceHandle())
 537             oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
 538
 539         GetTextMetrics(dc, &lpTextMetric);
 540         SIZE extentXY;
 541         ::GetTextExtentPoint(dc, (LPTSTR) (const wxChar *)s, s.Length(), &extentXY);
 542         int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 543
 544         if (oldFont)
 545             ::SelectObject(dc, oldFont);
 546
 547         ReleaseDC(GetHwnd(), dc);
 548         if (extentX > existingExtent)
 549             SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(extentX), 0L);
 550         return;
 551     }
 552     else
 553     {
 554         int largestExtent = 0;
 555         HDC dc = GetWindowDC(GetHwnd());
 556         HFONT oldFont = 0;
 557         if (GetFont().Ok() && GetFont().GetResourceHandle())
 558             oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
 559
 560         GetTextMetrics(dc, &lpTextMetric);
 561         int i;
 562         for (i = 0; i < m_noItems; i++)
 563         {
 564             int len = (int)SendMessage(GetHwnd(), LB_GETTEXT, i, (LONG)wxBuffer);
 565             wxBuffer[len] = 0;
 566             SIZE extentXY;
 567             ::GetTextExtentPoint(dc, (LPTSTR)wxBuffer, len, &extentXY);
 568             int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 569             if (extentX > largestExtent)
 570                 largestExtent = extentX;
 571         }
 572         if (oldFont)
 573             ::SelectObject(dc, oldFont);
 574
 575         ReleaseDC(GetHwnd(), dc);
 576         SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(largestExtent), 0L);
 577     }
 578 }
 579
 580 void
 581 wxListBox::InsertItems(int nItems, const wxString items[], int pos)
 582 {
 583     wxCHECK_RET( pos >= 0 && pos <= m_noItems,
 584                  _T("invalid index in wxListBox::InsertItems") );
 585
 586     int i;
 587     for (i = 0; i < nItems; i++)
 588         ListBox_InsertString(GetHwnd(), i + pos, items[i]);
 589     m_noItems += nItems;
 590
 591     SetHorizontalExtent(_T(""));
 592 }
 593
 594 void wxListBox::SetString(int N, const wxString& s)
 595 {
 596     wxCHECK_RET( N >= 0 && N < m_noItems,
 597                  _T("invalid index in wxListBox::SetString") );
 598
 599     int sel = -1;
 600     if (!(m_windowStyle & wxLB_MULTIPLE) && !(m_windowStyle & wxLB_EXTENDED))
 601         sel = GetSelection();
 602
 603     void *oldData = wxListBox::GetClientData(N);
 604
 605     SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);
 606
 607     int newN = N;
 608     if (N == (m_noItems - 1))
 609         newN = -1;
 610
 611     SendMessage(GetHwnd(), LB_INSERTSTRING, newN, (LPARAM) (const wxChar *)s);
 612     if (oldData)
 613         wxListBox::SetClientData(N, oldData);
 614
 615     // Selection may have changed
 616     if (sel >= 0)
 617         SetSelection(sel);
 618
 619 #if       wxUSE_OWNER_DRAWN
 620     if ( m_windowStyle & wxLB_OWNERDRAW )
 621         // update item's text
 622         m_aItems[N]->SetName(s);
 623 #endif  //USE_OWNER_DRAWN
 624 }
 625
 626 int wxListBox::Number () const
 627 {
 628     return m_noItems;
 629 }
 630
 631 // For single selection items only
 632 wxString wxListBox::GetStringSelection () const
 633 {
 634     int sel = GetSelection ();
 635     if (sel > -1)
 636         return this->GetString (sel);
 637     else
 638         return wxString("");
 639 }
 640
 641 bool wxListBox::SetStringSelection (const wxString& s, bool flag)
 642 {
 643     int sel = FindString (s);
 644     if (sel > -1)
 645     {
 646         SetSelection (sel, flag);
 647         return TRUE;
 648     }
 649     else
 650         return FALSE;
 651 }
 652
 653 // Is this the right thing? Won't setselection generate a command
 654 // event too? No! It'll just generate a setselection event.
 655 // But we still can't have this being called whenever a real command
 656 // is generated, because it sets the selection, which will already
 657 // have been done! (Unless we have an optional argument for calling
 658 // by the actual window system, or a separate function, ProcessCommand)
 659 void wxListBox::Command (wxCommandEvent & event)
 660 {
 661     if (event.m_extraLong)
 662         SetSelection (event.m_commandInt);
 663     else
 664     {
 665         Deselect (event.m_commandInt);
 666         return;
 667     }
 668     ProcessCommand (event);
 669 }
 670
 671 WXHBRUSH wxListBox::OnCtlColor(WXHDC pDC, WXHWND pWnd, WXUINT nCtlColor,
 672         WXUINT message, WXWPARAM wParam, WXLPARAM lParam)
 673 {
 674 #if wxUSE_CTL3D
 675     if ( m_useCtl3D )
 676     {
 677         HBRUSH hbrush = Ctl3dCtlColorEx(message, wParam, lParam);
 678         return (WXHBRUSH) hbrush;
 679     }
 680 #endif
 681
 682     if (GetParent()->GetTransparentBackground())
 683         SetBkMode((HDC) pDC, TRANSPARENT);
 684     else
 685         SetBkMode((HDC) pDC, OPAQUE);
 686
 687     ::SetBkColor((HDC) pDC, RGB(GetBackgroundColour().Red(), GetBackgroundColour().Green(), GetBackgroundColour().Blue()));
 688     ::SetTextColor((HDC) pDC, RGB(GetForegroundColour().Red(), GetForegroundColour().Green(), GetForegroundColour().Blue()));
 689
 690     wxBrush *backgroundBrush = wxTheBrushList->FindOrCreateBrush(GetBackgroundColour(), wxSOLID);
 691
 692     // Note that this will be cleaned up in wxApp::OnIdle, if backgroundBrush
 693     // has a zero usage count.
 694     backgroundBrush->RealizeResource();
 695     return (WXHBRUSH) backgroundBrush->GetResourceHandle();
 696 }
 697
 698 long wxListBox::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam)
 699 {
 700     return wxControl::MSWWindowProc(nMsg, wParam, lParam);
 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     wxDC dc;
 725     dc.SetHDC((WXHDC)CreateIC(_T("DISPLAY"), NULL, NULL, 0));
 726     dc.SetFont(wxSystemSettings::GetSystemFont(wxSYS_ANSI_VAR_FONT));
 727
 728     pStruct->itemHeight = dc.GetCharHeight() + 2*OWNER_DRAWN_LISTBOX_EXTRA_SPACE;
 729     pStruct->itemWidth  = dc.GetCharWidth();
 730
 731     return TRUE;
 732 }
 733
 734 // forward the message to the appropriate item
 735 bool wxListBox::MSWOnDraw(WXDRAWITEMSTRUCT *item)
 736 {
 737     // only owner-drawn control should receive this message
 738     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), FALSE );
 739
 740     DRAWITEMSTRUCT *pStruct = (DRAWITEMSTRUCT *)item;
 741
 742     long data = ListBox_GetItemData(GetHwnd(), pStruct->itemID);
 743
 744     wxCHECK( data && (data != LB_ERR), FALSE );
 745
 746     wxListBoxItem *pItem = (wxListBoxItem *)data;
 747
 748     wxDC dc;
 749     dc.SetHDC((WXHDC)pStruct->hDC, FALSE);
 750     wxRect rect(wxPoint(pStruct->rcItem.left, pStruct->rcItem.top),
 751             wxPoint(pStruct->rcItem.right, pStruct->rcItem.bottom));
 752
 753     return pItem->OnDrawItem(dc, rect,
 754             (wxOwnerDrawn::wxODAction)pStruct->itemAction,
 755             (wxOwnerDrawn::wxODStatus)pStruct->itemState);
 756 }
 757
 758 #endif
 759     // wxUSE_OWNER_DRAWN