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 #if !USE_SHARED_LIBRARY
  86     IMPLEMENT_DYNAMIC_CLASS(wxListBox, wxControl)
  87 #endif
  88
  89 // ============================================================================
  90 // list box item declaration and implementation
  91 // ============================================================================
  92
  93 #if wxUSE_OWNER_DRAWN
  94
  95 class wxListBoxItem : public wxOwnerDrawn
  96 {
  97 public:
  98     wxListBoxItem(const wxString& str = "");
  99 };
 100
 101 wxListBoxItem::wxListBoxItem(const wxString& str) : wxOwnerDrawn(str, FALSE)
 102 {
 103     // no bitmaps/checkmarks
 104     SetMarginWidth(0);
 105 }
 106
 107 wxOwnerDrawn *wxListBox::CreateItem(size_t n)
 108 {
 109     return new wxListBoxItem();
 110 }
 111
 112 #endif  //USE_OWNER_DRAWN
 113
 114 // ============================================================================
 115 // list box control implementation
 116 // ============================================================================
 117
 118 // ----------------------------------------------------------------------------
 119 // creation
 120 // ----------------------------------------------------------------------------
 121
 122 // Listbox item
 123 wxListBox::wxListBox()
 124 {
 125     m_noItems = 0;
 126     m_selected = 0;
 127 }
 128
 129 bool wxListBox::Create(wxWindow *parent,
 130                        wxWindowID id,
 131                        const wxPoint& pos,
 132                        const wxSize& size,
 133                        int n, const wxString choices[],
 134                        long style,
 135                        const wxValidator& validator,
 136                        const wxString& name)
 137 {
 138     m_noItems = 0;
 139     m_hWnd = 0;
 140     m_selected = 0;
 141
 142     SetName(name);
 143     SetValidator(validator);
 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 #if wxUSE_OWNER_DRAWN
 234     size_t uiCount = m_aItems.Count();
 235     while ( uiCount-- != 0 ) {
 236         delete m_aItems[uiCount];
 237     }
 238 #endif // wxUSE_OWNER_DRAWN
 239 }
 240
 241 void wxListBox::SetupColours()
 242 {
 243     SetBackgroundColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_WINDOW));
 244     SetForegroundColour(GetParent()->GetForegroundColour());
 245 }
 246
 247 // ----------------------------------------------------------------------------
 248 // implementation of wxListBoxBase methods
 249 // ----------------------------------------------------------------------------
 250
 251 void wxListBox::DoSetFirstItem(int N)
 252 {
 253     wxCHECK_RET( N >= 0 && N < m_noItems,
 254                  wxT("invalid index in wxListBox::SetFirstItem") );
 255
 256     SendMessage(GetHwnd(), LB_SETTOPINDEX, (WPARAM)N, (LPARAM)0);
 257 }
 258
 259 void wxListBox::Delete(int N)
 260 {
 261     wxCHECK_RET( N >= 0 && N < m_noItems,
 262                  wxT("invalid index in wxListBox::Delete") );
 263
 264     SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);
 265     m_noItems--;
 266
 267     SetHorizontalExtent("");
 268 }
 269
 270 int wxListBox::DoAppend(const wxString& item)
 271 {
 272     int index = ListBox_AddString(GetHwnd(), item);
 273     m_noItems++;
 274
 275 #if wxUSE_OWNER_DRAWN
 276     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 277         wxOwnerDrawn *pNewItem = CreateItem(index); // dummy argument
 278         pNewItem->SetName(item);
 279         m_aItems.Add(pNewItem);
 280         ListBox_SetItemData(GetHwnd(), index, pNewItem);
 281     }
 282 #endif
 283
 284     SetHorizontalExtent(item);
 285
 286     return index;
 287 }
 288
 289 void wxListBox::DoSetItems(const wxArrayString& choices, void** clientData)
 290 {
 291     ShowWindow(GetHwnd(), SW_HIDE);
 292
 293     ListBox_ResetContent(GetHwnd());
 294
 295     m_noItems = choices.GetCount();
 296     int i;
 297     for (i = 0; i < m_noItems; i++)
 298     {
 299         ListBox_AddString(GetHwnd(), choices[i]);
 300         if ( clientData )
 301         {
 302 #if wxUSE_OWNER_DRAWN
 303             wxASSERT_MSG(clientData[ui] == NULL,
 304                          wxT("Can't use client data with owner-drawn listboxes"));
 305 #else // !wxUSE_OWNER_DRAWN
 306             ListBox_SetItemData(GetHwnd(), i, clientData[i]);
 307 #endif // wxUSE_OWNER_DRAWN/!wxUSE_OWNER_DRAWN
 308         }
 309     }
 310
 311 #if wxUSE_OWNER_DRAWN
 312     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 313         // first delete old items
 314         size_t ui = m_aItems.Count();
 315         while ( ui-- != 0 ) {
 316             delete m_aItems[ui];
 317         }
 318         m_aItems.Empty();
 319
 320         // then create new ones
 321         for ( ui = 0; ui < (size_t)m_noItems; ui++ ) {
 322             wxOwnerDrawn *pNewItem = CreateItem(ui);
 323             pNewItem->SetName(choices[ui]);
 324             m_aItems.Add(pNewItem);
 325             ListBox_SetItemData(GetHwnd(), ui, pNewItem);
 326         }
 327     }
 328 #endif // wxUSE_OWNER_DRAWN
 329
 330     SetHorizontalExtent();
 331
 332     ShowWindow(GetHwnd(), SW_SHOW);
 333 }
 334
 335 int wxListBox::FindString(const wxString& s) const
 336 {
 337     int pos = ListBox_FindStringExact(GetHwnd(), (WPARAM)-1, s);
 338     if (pos == LB_ERR)
 339         return wxNOT_FOUND;
 340     else
 341         return pos;
 342 }
 343
 344 void wxListBox::Clear()
 345 {
 346     ListBox_ResetContent(GetHwnd());
 347
 348 #if wxUSE_OWNER_DRAWN
 349     size_t uiCount = m_aItems.Count();
 350     while ( uiCount-- != 0 ) {
 351         delete m_aItems[uiCount];
 352     }
 353
 354     m_aItems.Clear();
 355 #endif // wxUSE_OWNER_DRAWN
 356
 357     m_noItems = 0;
 358     SetHorizontalExtent();
 359 }
 360
 361 void wxListBox::SetSelection(int N, bool select)
 362 {
 363     wxCHECK_RET( N >= 0 && N < m_noItems,
 364                  wxT("invalid index in wxListBox::SetSelection") );
 365
 366     if ( HasMultipleSelection() )
 367     {
 368         SendMessage(GetHwnd(), LB_SETSEL, select, N);
 369     }
 370     else
 371     {
 372         SendMessage(GetHwnd(), LB_SETCURSEL, select ? N : -1, 0);
 373     }
 374 }
 375
 376 bool wxListBox::IsSelected(int N) const
 377 {
 378     wxCHECK_MSG( N >= 0 && N < m_noItems, FALSE,
 379                  wxT("invalid index in wxListBox::Selected") );
 380
 381     return SendMessage(GetHwnd(), LB_GETSEL, N, 0) == 0 ? FALSE : TRUE;
 382 }
 383
 384 wxClientData* wxListBox::DoGetClientObject(int n) const
 385 {
 386     return (wxClientData *)DoGetClientData(n);
 387 }
 388
 389 void *wxListBox::DoGetClientData(int n) const
 390 {
 391     wxCHECK_MSG( n >= 0 && n < m_noItems, NULL,
 392                  wxT("invalid index in wxListBox::GetClientData") );
 393
 394     return (void *)SendMessage(GetHwnd(), LB_GETITEMDATA, n, 0);
 395 }
 396
 397 void wxListBox::DoSetClientObject(int n, wxClientData* clientData)
 398 {
 399     DoSetClientData(n, clientData);
 400 }
 401
 402 void wxListBox::DoSetClientData(int n, void *clientData)
 403 {
 404     wxCHECK_RET( n >= 0 && n < m_noItems,
 405                  wxT("invalid index in wxListBox::SetClientData") );
 406
 407 #if wxUSE_OWNER_DRAWN
 408     if ( m_windowStyle & wxLB_OWNERDRAW )
 409     {
 410         // client data must be pointer to wxOwnerDrawn, otherwise we would crash
 411         // in OnMeasure/OnDraw.
 412         wxFAIL_MSG(wxT("Can't use client data with owner-drawn listboxes"));
 413     }
 414 #endif // wxUSE_OWNER_DRAWN
 415
 416     if ( ListBox_SetItemData(GetHwnd(), n, clientData) == LB_ERR )
 417         wxLogDebug(wxT("LB_SETITEMDATA failed"));
 418 }
 419
 420 bool wxListBox::HasMultipleSelection() const
 421 {
 422     return (m_windowStyle & wxLB_MULTIPLE) || (m_windowStyle & wxLB_EXTENDED);
 423 }
 424
 425 // Return number of selections and an array of selected integers
 426 int wxListBox::GetSelections(wxArrayInt& aSelections) const
 427 {
 428     aSelections.Empty();
 429
 430     if ( HasMultipleSelection() )
 431     {
 432         int no_sel = ListBox_GetSelCount(GetHwnd());
 433         if (no_sel != 0) {
 434             int *selections = new int[no_sel];
 435             int rc = ListBox_GetSelItems(GetHwnd(), no_sel, selections);
 436
 437             wxCHECK_MSG(rc != LB_ERR, -1, wxT("ListBox_GetSelItems failed"));
 438
 439             aSelections.Alloc(no_sel);
 440             for ( int n = 0; n < no_sel; n++ )
 441                 aSelections.Add(selections[n]);
 442
 443             delete [] selections;
 444         }
 445
 446         return no_sel;
 447     }
 448     else  // single-selection listbox
 449     {
 450         aSelections.Add(ListBox_GetCurSel(GetHwnd()));
 451
 452         return 1;
 453     }
 454 }
 455
 456 // Get single selection, for single choice list items
 457 int wxListBox::GetSelection() const
 458 {
 459     wxCHECK_MSG( !HasMultipleSelection(),
 460                  -1,
 461                  wxT("GetSelection() can't be used with multiple-selection "
 462                     "listboxes, use GetSelections() instead.") );
 463
 464     return ListBox_GetCurSel(GetHwnd());
 465 }
 466
 467 // Find string for position
 468 wxString wxListBox::GetString(int N) const
 469 {
 470     wxCHECK_MSG( N >= 0 && N < m_noItems, "",
 471                  wxT("invalid index in wxListBox::GetClientData") );
 472
 473     int len = ListBox_GetTextLen(GetHwnd(), N);
 474
 475     // +1 for terminating NUL
 476     wxString result;
 477     ListBox_GetText(GetHwnd(), N, result.GetWriteBuf(len + 1));
 478     result.UngetWriteBuf();
 479
 480     return result;
 481 }
 482
 483 void
 484 wxListBox::DoInsertItems(const wxArrayString& items, int pos)
 485 {
 486     wxCHECK_RET( pos >= 0 && pos <= m_noItems,
 487                  wxT("invalid index in wxListBox::InsertItems") );
 488
 489     int nItems = items.GetCount();
 490     for ( int i = 0; i < nItems; i++ )
 491         ListBox_InsertString(GetHwnd(), i + pos, items[i]);
 492     m_noItems += nItems;
 493
 494     SetHorizontalExtent();
 495 }
 496
 497 void wxListBox::SetString(int N, const wxString& s)
 498 {
 499     wxCHECK_RET( N >= 0 && N < m_noItems,
 500                  wxT("invalid index in wxListBox::SetString") );
 501
 502     // remember the state of the item
 503     bool wasSelected = IsSelected(N);
 504
 505     void *oldData = NULL;
 506     wxClientData *oldObjData = NULL;
 507     if ( m_clientDataItemsType == ClientData_Void )
 508         oldData = GetClientData(N);
 509     else if ( m_clientDataItemsType == ClientData_Object )
 510         oldObjData = GetClientObject(N);
 511
 512     // delete and recreate it
 513     SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);
 514
 515     int newN = N;
 516     if ( N == m_noItems - 1 )
 517         newN = -1;
 518
 519     ListBox_InsertString(GetHwnd(), newN, s);
 520
 521     // restore the client data
 522     if ( oldData )
 523         SetClientData(N, oldData);
 524     else if ( oldObjData )
 525         SetClientObject(N, oldObjData);
 526
 527     // we may have lost the selection
 528     if ( wasSelected )
 529         Select(N);
 530
 531 #if wxUSE_OWNER_DRAWN
 532     if ( m_windowStyle & wxLB_OWNERDRAW )
 533         // update item's text
 534         m_aItems[N]->SetName(s);
 535 #endif  //USE_OWNER_DRAWN
 536 }
 537
 538 int wxListBox::GetCount() const
 539 {
 540     return m_noItems;
 541 }
 542
 543 // ----------------------------------------------------------------------------
 544 // helpers
 545 // ----------------------------------------------------------------------------
 546
 547 // Windows-specific code to set the horizontal extent of the listbox, if
 548 // necessary. If s is non-NULL, it's used to calculate the horizontal extent.
 549 // Otherwise, all strings are used.
 550 void wxListBox::SetHorizontalExtent(const wxString& s)
 551 {
 552     // Only necessary if we want a horizontal scrollbar
 553     if (!(m_windowStyle & wxHSCROLL))
 554         return;
 555     TEXTMETRIC lpTextMetric;
 556
 557     if ( !s.IsEmpty() )
 558     {
 559         int existingExtent = (int)SendMessage(GetHwnd(), LB_GETHORIZONTALEXTENT, 0, 0L);
 560         HDC dc = GetWindowDC(GetHwnd());
 561         HFONT oldFont = 0;
 562         if (GetFont().Ok() && GetFont().GetResourceHandle())
 563             oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
 564
 565         GetTextMetrics(dc, &lpTextMetric);
 566         SIZE extentXY;
 567         ::GetTextExtentPoint(dc, (LPTSTR) (const wxChar *)s, s.Length(), &extentXY);
 568         int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 569
 570         if (oldFont)
 571             ::SelectObject(dc, oldFont);
 572
 573         ReleaseDC(GetHwnd(), dc);
 574         if (extentX > existingExtent)
 575             SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(extentX), 0L);
 576     }
 577     else
 578     {
 579         int largestExtent = 0;
 580         HDC dc = GetWindowDC(GetHwnd());
 581         HFONT oldFont = 0;
 582         if (GetFont().Ok() && GetFont().GetResourceHandle())
 583             oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
 584
 585         GetTextMetrics(dc, &lpTextMetric);
 586         int i;
 587         for (i = 0; i < m_noItems; i++)
 588         {
 589             int len = (int)SendMessage(GetHwnd(), LB_GETTEXT, i, (LONG)wxBuffer);
 590             wxBuffer[len] = 0;
 591             SIZE extentXY;
 592             ::GetTextExtentPoint(dc, (LPTSTR)wxBuffer, len, &extentXY);
 593             int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 594             if (extentX > largestExtent)
 595                 largestExtent = extentX;
 596         }
 597         if (oldFont)
 598             ::SelectObject(dc, oldFont);
 599
 600         ReleaseDC(GetHwnd(), dc);
 601         SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(largestExtent), 0L);
 602     }
 603 }
 604
 605 wxSize wxListBox::DoGetBestSize()
 606 {
 607     // find the widest string
 608     int wLine;
 609     int wListbox = 0;
 610     for ( int i = 0; i < m_noItems; i++ )
 611     {
 612         wxString str(GetString(i));
 613         GetTextExtent(str, &wLine, NULL);
 614         if ( wLine > wListbox )
 615             wListbox = wLine;
 616     }
 617
 618     // give it some reasonable default value if there are no strings in the
 619     // list
 620     if ( wListbox == 0 )
 621         wListbox = 100;
 622
 623     // the listbox should be slightly larger than the widest string
 624     int cx, cy;
 625     wxGetCharSize(GetHWND(), &cx, &cy, &GetFont());
 626
 627     wListbox += 3*cx;
 628
 629     int hListbox = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy)*(wxMax(m_noItems, 7));
 630
 631     return wxSize(wListbox, hListbox);
 632 }
 633
 634 // ----------------------------------------------------------------------------
 635 // callbacks
 636 // ----------------------------------------------------------------------------
 637
 638 bool wxListBox::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 639 {
 640     /*
 641        if (param == LBN_SELCANCEL)
 642        {
 643        event.extraLong = FALSE;
 644        }
 645      */
 646     if (param == LBN_SELCHANGE)
 647     {
 648         wxCommandEvent event(wxEVT_COMMAND_LISTBOX_SELECTED, m_windowId);
 649         wxArrayInt aSelections;
 650         int count = GetSelections(aSelections);
 651         if ( count > 0 )
 652         {
 653             event.m_commandInt = aSelections[0];
 654             event.m_clientData = GetClientData(event.m_commandInt);
 655             wxString str(GetString(event.m_commandInt));
 656             if (str != wxT(""))
 657             {
 658                 event.m_commandString = str;
 659             }
 660         }
 661         else
 662         {
 663             event.m_commandInt = -1;
 664             event.m_commandString.Empty();
 665         }
 666
 667         event.SetEventObject( this );
 668         ProcessCommand(event);
 669         return TRUE;
 670     }
 671     else if (param == LBN_DBLCLK)
 672     {
 673         wxCommandEvent event(wxEVT_COMMAND_LISTBOX_DOUBLECLICKED, m_windowId);
 674         event.SetEventObject( this );
 675         GetEventHandler()->ProcessEvent(event);
 676         return TRUE;
 677     }
 678
 679     return FALSE;
 680 }
 681
 682 WXHBRUSH wxListBox::OnCtlColor(WXHDC pDC, WXHWND pWnd, WXUINT nCtlColor,
 683                                WXUINT message, WXWPARAM wParam, WXLPARAM lParam)
 684 {
 685 #if wxUSE_CTL3D
 686     if ( m_useCtl3D )
 687     {
 688         HBRUSH hbrush = Ctl3dCtlColorEx(message, wParam, lParam);
 689         return (WXHBRUSH) hbrush;
 690     }
 691 #endif
 692
 693     if (GetParent()->GetTransparentBackground())
 694         SetBkMode((HDC) pDC, TRANSPARENT);
 695     else
 696         SetBkMode((HDC) pDC, OPAQUE);
 697
 698     ::SetBkColor((HDC) pDC, RGB(GetBackgroundColour().Red(), GetBackgroundColour().Green(), GetBackgroundColour().Blue()));
 699     ::SetTextColor((HDC) pDC, RGB(GetForegroundColour().Red(), GetForegroundColour().Green(), GetForegroundColour().Blue()));
 700
 701     wxBrush *backgroundBrush = wxTheBrushList->FindOrCreateBrush(GetBackgroundColour(), wxSOLID);
 702
 703     // Note that this will be cleaned up in wxApp::OnIdle, if backgroundBrush
 704     // has a zero usage count.
 705     backgroundBrush->RealizeResource();
 706     return (WXHBRUSH) backgroundBrush->GetResourceHandle();
 707 }
 708
 709 // ----------------------------------------------------------------------------
 710 // wxCheckListBox support
 711 // ----------------------------------------------------------------------------
 712
 713 #if wxUSE_OWNER_DRAWN
 714
 715 // drawing
 716 // -------
 717
 718 // space beneath/above each row in pixels
 719 // "standard" checklistbox use 1 here, some might prefer 2. 0 is ugly.
 720 #define OWNER_DRAWN_LISTBOX_EXTRA_SPACE    (1)
 721
 722 // the height is the same for all items
 723 // TODO should be changed for LBS_OWNERDRAWVARIABLE style listboxes
 724
 725 // NB: can't forward this to wxListBoxItem because LB_SETITEMDATA
 726 //     message is not yet sent when we get here!
 727 bool wxListBox::MSWOnMeasure(WXMEASUREITEMSTRUCT *item)
 728 {
 729     // only owner-drawn control should receive this message
 730     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), FALSE );
 731
 732     MEASUREITEMSTRUCT *pStruct = (MEASUREITEMSTRUCT *)item;
 733
 734     wxDC dc;
 735     dc.SetHDC((WXHDC)CreateIC(wxT("DISPLAY"), NULL, NULL, 0));
 736     dc.SetFont(wxSystemSettings::GetSystemFont(wxSYS_ANSI_VAR_FONT));
 737
 738     pStruct->itemHeight = dc.GetCharHeight() + 2*OWNER_DRAWN_LISTBOX_EXTRA_SPACE;
 739     pStruct->itemWidth  = dc.GetCharWidth();
 740
 741     return TRUE;
 742 }
 743
 744 // forward the message to the appropriate item
 745 bool wxListBox::MSWOnDraw(WXDRAWITEMSTRUCT *item)
 746 {
 747     // only owner-drawn control should receive this message
 748     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), FALSE );
 749
 750     DRAWITEMSTRUCT *pStruct = (DRAWITEMSTRUCT *)item;
 751
 752     long data = ListBox_GetItemData(GetHwnd(), pStruct->itemID);
 753
 754     wxCHECK( data && (data != LB_ERR), FALSE );
 755
 756     wxListBoxItem *pItem = (wxListBoxItem *)data;
 757
 758     wxDC dc;
 759     dc.SetHDC((WXHDC)pStruct->hDC, FALSE);
 760     wxRect rect(wxPoint(pStruct->rcItem.left, pStruct->rcItem.top),
 761             wxPoint(pStruct->rcItem.right, pStruct->rcItem.bottom));
 762
 763     return pItem->OnDrawItem(dc, rect,
 764             (wxOwnerDrawn::wxODAction)pStruct->itemAction,
 765             (wxOwnerDrawn::wxODStatus)pStruct->itemState);
 766 }
 767
 768 #endif
 769     // wxUSE_OWNER_DRAWN