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     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     }
 287 #endif
 288
 289     SetHorizontalExtent(item);
 290
 291     return index;
 292 }
 293
 294 void wxListBox::DoSetItems(const wxArrayString& choices, void** clientData)
 295 {
 296     ShowWindow(GetHwnd(), SW_HIDE);
 297
 298     ListBox_ResetContent(GetHwnd());
 299
 300     m_noItems = choices.GetCount();
 301     int i;
 302     for (i = 0; i < m_noItems; i++)
 303     {
 304         ListBox_AddString(GetHwnd(), choices[i]);
 305         if ( clientData )
 306         {
 307 #if wxUSE_OWNER_DRAWN
 308             wxASSERT_MSG(clientData[i] == NULL,
 309                          wxT("Can't use client data with owner-drawn listboxes"));
 310 #else // !wxUSE_OWNER_DRAWN
 311             ListBox_SetItemData(GetHwnd(), i, clientData[i]);
 312 #endif // wxUSE_OWNER_DRAWN/!wxUSE_OWNER_DRAWN
 313         }
 314     }
 315
 316 #if wxUSE_OWNER_DRAWN
 317     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 318         // first delete old items
 319         size_t ui = m_aItems.Count();
 320         while ( ui-- != 0 ) {
 321             delete m_aItems[ui];
 322         }
 323         m_aItems.Empty();
 324
 325         // then create new ones
 326         for ( ui = 0; ui < (size_t)m_noItems; ui++ ) {
 327             wxOwnerDrawn *pNewItem = CreateItem(ui);
 328             pNewItem->SetName(choices[ui]);
 329             m_aItems.Add(pNewItem);
 330             ListBox_SetItemData(GetHwnd(), ui, pNewItem);
 331         }
 332     }
 333 #endif // wxUSE_OWNER_DRAWN
 334
 335     SetHorizontalExtent();
 336
 337     ShowWindow(GetHwnd(), SW_SHOW);
 338 }
 339
 340 int wxListBox::FindString(const wxString& s) const
 341 {
 342     int pos = ListBox_FindStringExact(GetHwnd(), (WPARAM)-1, s);
 343     if (pos == LB_ERR)
 344         return wxNOT_FOUND;
 345     else
 346         return pos;
 347 }
 348
 349 void wxListBox::Clear()
 350 {
 351     Free();
 352
 353     ListBox_ResetContent(GetHwnd());
 354
 355     m_noItems = 0;
 356     SetHorizontalExtent();
 357 }
 358
 359 void wxListBox::Free()
 360 {
 361 #if wxUSE_OWNER_DRAWN
 362     if ( m_windowStyle & wxLB_OWNERDRAW )
 363     {
 364         size_t uiCount = m_aItems.Count();
 365         while ( uiCount-- != 0 ) {
 366             delete m_aItems[uiCount];
 367         }
 368
 369         m_aItems.Clear();
 370     }
 371     else
 372 #endif // wxUSE_OWNER_DRAWN
 373     if ( HasClientObjectData() )
 374     {
 375         for ( size_t n = 0; n < (size_t)m_noItems; n++ )
 376         {
 377             delete GetClientObject(n);
 378         }
 379     }
 380 }
 381
 382 void wxListBox::SetSelection(int N, bool select)
 383 {
 384     wxCHECK_RET( N >= 0 && N < m_noItems,
 385                  wxT("invalid index in wxListBox::SetSelection") );
 386
 387     if ( HasMultipleSelection() )
 388     {
 389         SendMessage(GetHwnd(), LB_SETSEL, select, N);
 390     }
 391     else
 392     {
 393         SendMessage(GetHwnd(), LB_SETCURSEL, select ? N : -1, 0);
 394     }
 395 }
 396
 397 bool wxListBox::IsSelected(int N) const
 398 {
 399     wxCHECK_MSG( N >= 0 && N < m_noItems, FALSE,
 400                  wxT("invalid index in wxListBox::Selected") );
 401
 402     return SendMessage(GetHwnd(), LB_GETSEL, N, 0) == 0 ? FALSE : TRUE;
 403 }
 404
 405 wxClientData* wxListBox::DoGetItemClientObject(int n) const
 406 {
 407     return (wxClientData *)DoGetItemClientData(n);
 408 }
 409
 410 void *wxListBox::DoGetItemClientData(int n) const
 411 {
 412     wxCHECK_MSG( n >= 0 && n < m_noItems, NULL,
 413                  wxT("invalid index in wxListBox::GetClientData") );
 414
 415     return (void *)SendMessage(GetHwnd(), LB_GETITEMDATA, n, 0);
 416 }
 417
 418 void wxListBox::DoSetItemClientObject(int n, wxClientData* clientData)
 419 {
 420     DoSetItemClientData(n, clientData);
 421 }
 422
 423 void wxListBox::DoSetItemClientData(int n, void *clientData)
 424 {
 425     wxCHECK_RET( n >= 0 && n < m_noItems,
 426                  wxT("invalid index in wxListBox::SetClientData") );
 427
 428 #if wxUSE_OWNER_DRAWN
 429     if ( m_windowStyle & wxLB_OWNERDRAW )
 430     {
 431         // client data must be pointer to wxOwnerDrawn, otherwise we would crash
 432         // in OnMeasure/OnDraw.
 433         wxFAIL_MSG(wxT("Can't use client data with owner-drawn listboxes"));
 434     }
 435 #endif // wxUSE_OWNER_DRAWN
 436
 437     if ( ListBox_SetItemData(GetHwnd(), n, clientData) == LB_ERR )
 438         wxLogDebug(wxT("LB_SETITEMDATA failed"));
 439 }
 440
 441 bool wxListBox::HasMultipleSelection() const
 442 {
 443     return (m_windowStyle & wxLB_MULTIPLE) || (m_windowStyle & wxLB_EXTENDED);
 444 }
 445
 446 // Return number of selections and an array of selected integers
 447 int wxListBox::GetSelections(wxArrayInt& aSelections) const
 448 {
 449     aSelections.Empty();
 450
 451     if ( HasMultipleSelection() )
 452     {
 453         int no_sel = ListBox_GetSelCount(GetHwnd());
 454         if (no_sel != 0) {
 455             int *selections = new int[no_sel];
 456             int rc = ListBox_GetSelItems(GetHwnd(), no_sel, selections);
 457
 458             wxCHECK_MSG(rc != LB_ERR, -1, wxT("ListBox_GetSelItems failed"));
 459
 460             aSelections.Alloc(no_sel);
 461             for ( int n = 0; n < no_sel; n++ )
 462                 aSelections.Add(selections[n]);
 463
 464             delete [] selections;
 465         }
 466
 467         return no_sel;
 468     }
 469     else  // single-selection listbox
 470     {
 471         aSelections.Add(ListBox_GetCurSel(GetHwnd()));
 472
 473         return 1;
 474     }
 475 }
 476
 477 // Get single selection, for single choice list items
 478 int wxListBox::GetSelection() const
 479 {
 480     wxCHECK_MSG( !HasMultipleSelection(),
 481                  -1,
 482                  wxT("GetSelection() can't be used with multiple-selection "
 483                     "listboxes, use GetSelections() instead.") );
 484
 485     return ListBox_GetCurSel(GetHwnd());
 486 }
 487
 488 // Find string for position
 489 wxString wxListBox::GetString(int N) const
 490 {
 491     wxCHECK_MSG( N >= 0 && N < m_noItems, "",
 492                  wxT("invalid index in wxListBox::GetClientData") );
 493
 494     int len = ListBox_GetTextLen(GetHwnd(), N);
 495
 496     // +1 for terminating NUL
 497     wxString result;
 498     ListBox_GetText(GetHwnd(), N, result.GetWriteBuf(len + 1));
 499     result.UngetWriteBuf();
 500
 501     return result;
 502 }
 503
 504 void
 505 wxListBox::DoInsertItems(const wxArrayString& items, int pos)
 506 {
 507     wxCHECK_RET( pos >= 0 && pos <= m_noItems,
 508                  wxT("invalid index in wxListBox::InsertItems") );
 509
 510     int nItems = items.GetCount();
 511     for ( int i = 0; i < nItems; i++ )
 512         ListBox_InsertString(GetHwnd(), i + pos, items[i]);
 513     m_noItems += nItems;
 514
 515     SetHorizontalExtent();
 516 }
 517
 518 void wxListBox::SetString(int N, const wxString& s)
 519 {
 520     wxCHECK_RET( N >= 0 && N < m_noItems,
 521                  wxT("invalid index in wxListBox::SetString") );
 522
 523     // remember the state of the item
 524     bool wasSelected = IsSelected(N);
 525
 526     void *oldData = NULL;
 527     wxClientData *oldObjData = NULL;
 528     if ( m_clientDataItemsType == ClientData_Void )
 529         oldData = GetClientData(N);
 530     else if ( m_clientDataItemsType == ClientData_Object )
 531         oldObjData = GetClientObject(N);
 532
 533     // delete and recreate it
 534     SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);
 535
 536     int newN = N;
 537     if ( N == m_noItems - 1 )
 538         newN = -1;
 539
 540     ListBox_InsertString(GetHwnd(), newN, s);
 541
 542     // restore the client data
 543     if ( oldData )
 544         SetClientData(N, oldData);
 545     else if ( oldObjData )
 546         SetClientObject(N, oldObjData);
 547
 548     // we may have lost the selection
 549     if ( wasSelected )
 550         Select(N);
 551
 552 #if wxUSE_OWNER_DRAWN
 553     if ( m_windowStyle & wxLB_OWNERDRAW )
 554         // update item's text
 555         m_aItems[N]->SetName(s);
 556 #endif  //USE_OWNER_DRAWN
 557 }
 558
 559 int wxListBox::GetCount() const
 560 {
 561     return m_noItems;
 562 }
 563
 564 // ----------------------------------------------------------------------------
 565 // helpers
 566 // ----------------------------------------------------------------------------
 567
 568 // Windows-specific code to set the horizontal extent of the listbox, if
 569 // necessary. If s is non-NULL, it's used to calculate the horizontal extent.
 570 // Otherwise, all strings are used.
 571 void wxListBox::SetHorizontalExtent(const wxString& s)
 572 {
 573     // Only necessary if we want a horizontal scrollbar
 574     if (!(m_windowStyle & wxHSCROLL))
 575         return;
 576     TEXTMETRIC lpTextMetric;
 577
 578     if ( !s.IsEmpty() )
 579     {
 580         int existingExtent = (int)SendMessage(GetHwnd(), LB_GETHORIZONTALEXTENT, 0, 0L);
 581         HDC dc = GetWindowDC(GetHwnd());
 582         HFONT oldFont = 0;
 583         if (GetFont().Ok() && GetFont().GetResourceHandle())
 584             oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
 585
 586         GetTextMetrics(dc, &lpTextMetric);
 587         SIZE extentXY;
 588         ::GetTextExtentPoint(dc, (LPTSTR) (const wxChar *)s, s.Length(), &extentXY);
 589         int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 590
 591         if (oldFont)
 592             ::SelectObject(dc, oldFont);
 593
 594         ReleaseDC(GetHwnd(), dc);
 595         if (extentX > existingExtent)
 596             SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(extentX), 0L);
 597     }
 598     else
 599     {
 600         int largestExtent = 0;
 601         HDC dc = GetWindowDC(GetHwnd());
 602         HFONT oldFont = 0;
 603         if (GetFont().Ok() && GetFont().GetResourceHandle())
 604             oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
 605
 606         GetTextMetrics(dc, &lpTextMetric);
 607         int i;
 608         for (i = 0; i < m_noItems; i++)
 609         {
 610             int len = (int)SendMessage(GetHwnd(), LB_GETTEXT, i, (LONG)wxBuffer);
 611             wxBuffer[len] = 0;
 612             SIZE extentXY;
 613             ::GetTextExtentPoint(dc, (LPTSTR)wxBuffer, len, &extentXY);
 614             int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 615             if (extentX > largestExtent)
 616                 largestExtent = extentX;
 617         }
 618         if (oldFont)
 619             ::SelectObject(dc, oldFont);
 620
 621         ReleaseDC(GetHwnd(), dc);
 622         SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(largestExtent), 0L);
 623     }
 624 }
 625
 626 wxSize wxListBox::DoGetBestSize()
 627 {
 628     // find the widest string
 629     int wLine;
 630     int wListbox = 0;
 631     for ( int i = 0; i < m_noItems; i++ )
 632     {
 633         wxString str(GetString(i));
 634         GetTextExtent(str, &wLine, NULL);
 635         if ( wLine > wListbox )
 636             wListbox = wLine;
 637     }
 638
 639     // give it some reasonable default value if there are no strings in the
 640     // list
 641     if ( wListbox == 0 )
 642         wListbox = 100;
 643
 644     // the listbox should be slightly larger than the widest string
 645     int cx, cy;
 646     wxGetCharSize(GetHWND(), &cx, &cy, &GetFont());
 647
 648     wListbox += 3*cx;
 649
 650     int hListbox = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy)*(wxMax(m_noItems, 7));
 651
 652     return wxSize(wListbox, hListbox);
 653 }
 654
 655 // ----------------------------------------------------------------------------
 656 // callbacks
 657 // ----------------------------------------------------------------------------
 658
 659 bool wxListBox::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 660 {
 661     if ( param == LBN_SELCHANGE )
 662     {
 663         wxCommandEvent event(wxEVT_COMMAND_LISTBOX_SELECTED, m_windowId);
 664         event.SetEventObject( this );
 665
 666         wxArrayInt aSelections;
 667         int n, count = GetSelections(aSelections);
 668         if ( count > 0 )
 669         {
 670             n = aSelections[0];
 671             if ( HasClientObjectData() )
 672                 event.SetClientObject( GetClientObject(n) );
 673             else if ( HasClientUntypedData() )
 674                 event.SetClientData( GetClientData(n) );
 675             event.SetString( GetString(n) );
 676         }
 677         else
 678         {
 679             n = -1;
 680         }
 681
 682         event.m_commandInt = n;
 683
 684         return GetEventHandler()->ProcessEvent(event);
 685     }
 686     else if ( param == LBN_DBLCLK )
 687     {
 688         wxCommandEvent event(wxEVT_COMMAND_LISTBOX_DOUBLECLICKED, m_windowId);
 689         event.SetEventObject( this );
 690
 691         return GetEventHandler()->ProcessEvent(event);
 692     }
 693     //else:
 694
 695     return FALSE;
 696 }
 697
 698 WXHBRUSH wxListBox::OnCtlColor(WXHDC pDC, WXHWND pWnd, WXUINT nCtlColor,
 699                                WXUINT message, WXWPARAM wParam, WXLPARAM lParam)
 700 {
 701 #if wxUSE_CTL3D
 702     if ( m_useCtl3D )
 703     {
 704         HBRUSH hbrush = Ctl3dCtlColorEx(message, wParam, lParam);
 705         return (WXHBRUSH) hbrush;
 706     }
 707 #endif
 708
 709     if (GetParent()->GetTransparentBackground())
 710         SetBkMode((HDC) pDC, TRANSPARENT);
 711     else
 712         SetBkMode((HDC) pDC, OPAQUE);
 713
 714     ::SetBkColor((HDC) pDC, RGB(GetBackgroundColour().Red(), GetBackgroundColour().Green(), GetBackgroundColour().Blue()));
 715     ::SetTextColor((HDC) pDC, RGB(GetForegroundColour().Red(), GetForegroundColour().Green(), GetForegroundColour().Blue()));
 716
 717     wxBrush *backgroundBrush = wxTheBrushList->FindOrCreateBrush(GetBackgroundColour(), wxSOLID);
 718
 719     // Note that this will be cleaned up in wxApp::OnIdle, if backgroundBrush
 720     // has a zero usage count.
 721     backgroundBrush->RealizeResource();
 722     return (WXHBRUSH) backgroundBrush->GetResourceHandle();
 723 }
 724
 725 // ----------------------------------------------------------------------------
 726 // wxCheckListBox support
 727 // ----------------------------------------------------------------------------
 728
 729 #if wxUSE_OWNER_DRAWN
 730
 731 // drawing
 732 // -------
 733
 734 // space beneath/above each row in pixels
 735 // "standard" checklistbox use 1 here, some might prefer 2. 0 is ugly.
 736 #define OWNER_DRAWN_LISTBOX_EXTRA_SPACE    (1)
 737
 738 // the height is the same for all items
 739 // TODO should be changed for LBS_OWNERDRAWVARIABLE style listboxes
 740
 741 // NB: can't forward this to wxListBoxItem because LB_SETITEMDATA
 742 //     message is not yet sent when we get here!
 743 bool wxListBox::MSWOnMeasure(WXMEASUREITEMSTRUCT *item)
 744 {
 745     // only owner-drawn control should receive this message
 746     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), FALSE );
 747
 748     MEASUREITEMSTRUCT *pStruct = (MEASUREITEMSTRUCT *)item;
 749
 750     HDC hdc = CreateIC(wxT("DISPLAY"), NULL, NULL, 0);
 751
 752     wxDC dc;
 753     dc.SetHDC((WXHDC)hdc);
 754     dc.SetFont(wxSystemSettings::GetSystemFont(wxSYS_ANSI_VAR_FONT));
 755
 756     pStruct->itemHeight = dc.GetCharHeight() + 2*OWNER_DRAWN_LISTBOX_EXTRA_SPACE;
 757     pStruct->itemWidth  = dc.GetCharWidth();
 758
 759     dc.SetHDC(0);
 760
 761     DeleteDC(hdc);
 762
 763     return TRUE;
 764 }
 765
 766 // forward the message to the appropriate item
 767 bool wxListBox::MSWOnDraw(WXDRAWITEMSTRUCT *item)
 768 {
 769     // only owner-drawn control should receive this message
 770     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), FALSE );
 771
 772     DRAWITEMSTRUCT *pStruct = (DRAWITEMSTRUCT *)item;
 773
 774     long data = ListBox_GetItemData(GetHwnd(), pStruct->itemID);
 775
 776     wxCHECK( data && (data != LB_ERR), FALSE );
 777
 778     wxListBoxItem *pItem = (wxListBoxItem *)data;
 779
 780     wxDC dc;
 781     dc.SetHDC((WXHDC)pStruct->hDC, FALSE);
 782     wxRect rect(wxPoint(pStruct->rcItem.left, pStruct->rcItem.top),
 783             wxPoint(pStruct->rcItem.right, pStruct->rcItem.bottom));
 784
 785     return pItem->OnDrawItem(dc, rect,
 786             (wxOwnerDrawn::wxODAction)pStruct->itemAction,
 787             (wxOwnerDrawn::wxODStatus)pStruct->itemState);
 788 }
 789
 790 #endif
 791     // wxUSE_OWNER_DRAWN