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 bool wxListBox::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 119 {
 120     /*
 121        if (param == LBN_SELCANCEL)
 122        {
 123        event.extraLong = FALSE;
 124        }
 125      */
 126     if (param == LBN_SELCHANGE)
 127     {
 128         wxCommandEvent event(wxEVT_COMMAND_LISTBOX_SELECTED, m_windowId);
 129         wxArrayInt aSelections;
 130         int count = GetSelections(aSelections);
 131         if ( count > 0 )
 132         {
 133             event.m_commandInt = aSelections[0] ;
 134             event.m_clientData = GetClientData(event.m_commandInt);
 135             wxString str(GetString(event.m_commandInt));
 136             if (str != wxT(""))
 137             {
 138                 event.m_commandString = str;
 139             }
 140         }
 141         else
 142         {
 143             event.m_commandInt = -1 ;
 144             event.m_commandString.Empty();
 145         }
 146
 147         event.SetEventObject( this );
 148         ProcessCommand(event);
 149         return TRUE;
 150     }
 151     else if (param == LBN_DBLCLK)
 152     {
 153         wxCommandEvent event(wxEVT_COMMAND_LISTBOX_DOUBLECLICKED, m_windowId);
 154         event.SetEventObject( this );
 155         GetEventHandler()->ProcessEvent(event) ;
 156         return TRUE;
 157     }
 158
 159     return FALSE;
 160 }
 161
 162     // Listbox item
 163 wxListBox::wxListBox()
 164 {
 165     m_noItems = 0;
 166     m_selected = 0;
 167 }
 168
 169 bool wxListBox::Create(wxWindow *parent,
 170                        wxWindowID id,
 171                        const wxPoint& pos,
 172                        const wxSize& size,
 173                        int n, const wxString choices[],
 174                        long style,
 175                        const wxValidator& validator,
 176                        const wxString& name)
 177 {
 178     m_noItems = 0;
 179     m_hWnd = 0;
 180     m_selected = 0;
 181
 182     SetName(name);
 183     SetValidator(validator);
 184
 185     if (parent)
 186         parent->AddChild(this);
 187
 188     wxSystemSettings settings;
 189     SetBackgroundColour(settings.GetSystemColour(wxSYS_COLOUR_WINDOW));
 190     SetForegroundColour(parent->GetForegroundColour());
 191
 192     m_windowId = ( id == -1 ) ? (int)NewControlId() : id;
 193
 194     int x = pos.x;
 195     int y = pos.y;
 196     int width = size.x;
 197     int height = size.y;
 198     m_windowStyle = style;
 199
 200     DWORD wstyle = WS_VISIBLE | WS_VSCROLL | WS_TABSTOP |
 201                    LBS_NOTIFY | LBS_HASSTRINGS;
 202     if (m_windowStyle & wxLB_MULTIPLE)
 203         wstyle |= LBS_MULTIPLESEL;
 204     else if (m_windowStyle & wxLB_EXTENDED)
 205         wstyle |= LBS_EXTENDEDSEL;
 206
 207     if (m_windowStyle & wxLB_ALWAYS_SB)
 208         wstyle |= LBS_DISABLENOSCROLL ;
 209     if (m_windowStyle & wxLB_HSCROLL)
 210         wstyle |= WS_HSCROLL;
 211     if (m_windowStyle & wxLB_SORT)
 212         wstyle |= LBS_SORT;
 213
 214 #if wxUSE_OWNER_DRAWN
 215     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 216         // we don't support LBS_OWNERDRAWVARIABLE yet
 217         wstyle |= LBS_OWNERDRAWFIXED;
 218     }
 219 #endif
 220
 221     // Without this style, you get unexpected heights, so e.g. constraint layout
 222     // doesn't work properly
 223     wstyle |= LBS_NOINTEGRALHEIGHT;
 224
 225     bool want3D;
 226     WXDWORD exStyle = Determine3DEffects(WS_EX_CLIENTEDGE, &want3D) ;
 227
 228     // Even with extended styles, need to combine with WS_BORDER
 229     // for them to look right.
 230     if ( want3D || wxStyleHasBorder(m_windowStyle) )
 231     {
 232         wstyle |= WS_BORDER;
 233     }
 234
 235     m_hWnd = (WXHWND)::CreateWindowEx(exStyle, wxT("LISTBOX"), NULL,
 236             wstyle | WS_CHILD,
 237             0, 0, 0, 0,
 238             (HWND)parent->GetHWND(), (HMENU)m_windowId,
 239             wxGetInstance(), NULL);
 240
 241     wxCHECK_MSG( m_hWnd, FALSE, wxT("Failed to create listbox") );
 242
 243 #if wxUSE_CTL3D
 244     if (want3D)
 245     {
 246         Ctl3dSubclassCtl(GetHwnd());
 247         m_useCtl3D = TRUE;
 248     }
 249 #endif
 250
 251     // Subclass again to catch messages
 252     SubclassWin(m_hWnd);
 253
 254     size_t ui;
 255     for (ui = 0; ui < (size_t)n; ui++) {
 256         Append(choices[ui]);
 257     }
 258
 259     if ( (m_windowStyle & wxLB_MULTIPLE) == 0 )
 260         SendMessage(GetHwnd(), LB_SETCURSEL, 0, 0);
 261
 262     SetFont(parent->GetFont());
 263
 264     SetSize(x, y, width, height);
 265
 266     Show(TRUE);
 267
 268     return TRUE;
 269 }
 270
 271 wxListBox::~wxListBox()
 272 {
 273 #if wxUSE_OWNER_DRAWN
 274     size_t uiCount = m_aItems.Count();
 275     while ( uiCount-- != 0 ) {
 276         delete m_aItems[uiCount];
 277     }
 278 #endif // wxUSE_OWNER_DRAWN
 279 }
 280
 281 void wxListBox::SetupColours()
 282 {
 283     SetBackgroundColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_WINDOW));
 284     SetForegroundColour(GetParent()->GetForegroundColour());
 285 }
 286
 287 void wxListBox::SetFirstItem(int N)
 288 {
 289     wxCHECK_RET( N >= 0 && N < m_noItems,
 290                  wxT("invalid index in wxListBox::SetFirstItem") );
 291
 292     SendMessage(GetHwnd(),LB_SETTOPINDEX,(WPARAM)N,(LPARAM)0) ;
 293 }
 294
 295 void wxListBox::SetFirstItem(const wxString& s)
 296 {
 297     int N = FindString(s) ;
 298
 299     if ( N >= 0 )
 300         SetFirstItem(N) ;
 301 }
 302
 303 void wxListBox::Delete(int N)
 304 {
 305     wxCHECK_RET( N >= 0 && N < m_noItems,
 306                  wxT("invalid index in wxListBox::Delete") );
 307
 308     SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);
 309     m_noItems--;
 310
 311     SetHorizontalExtent("");
 312 }
 313
 314 void wxListBox::Append(const wxString& item)
 315 {
 316     int index = ListBox_AddString(GetHwnd(), item);
 317     m_noItems ++;
 318
 319 #if wxUSE_OWNER_DRAWN
 320     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 321         wxOwnerDrawn *pNewItem = CreateItem(index); // dummy argument
 322         pNewItem->SetName(item);
 323         m_aItems.Add(pNewItem);
 324         ListBox_SetItemData(GetHwnd(), index, pNewItem);
 325     }
 326 #endif
 327
 328     SetHorizontalExtent(item);
 329 }
 330
 331 void wxListBox::Append(const wxString& item, void *Client_data)
 332 {
 333     int index = ListBox_AddString(GetHwnd(), item);
 334     m_noItems ++;
 335
 336 #if wxUSE_OWNER_DRAWN
 337     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 338         // client data must be pointer to wxOwnerDrawn, otherwise we would crash
 339         // in OnMeasure/OnDraw.
 340         wxFAIL_MSG(wxT("Can't use client data with owner-drawn listboxes"));
 341     }
 342     else
 343 #endif
 344
 345     ListBox_SetItemData(GetHwnd(), index, Client_data);
 346
 347     SetHorizontalExtent(item);
 348 }
 349
 350 void wxListBox::Set(int n, const wxString *choices, void** clientData)
 351 {
 352     ShowWindow(GetHwnd(), SW_HIDE);
 353     ListBox_ResetContent(GetHwnd());
 354     int i;
 355     for (i = 0; i < n; i++)
 356     {
 357         ListBox_AddString(GetHwnd(), choices[i]);
 358         if ( clientData )
 359             ListBox_SetItemData(GetHwnd(), i, clientData[i]);
 360     }
 361     m_noItems = n;
 362
 363 #if wxUSE_OWNER_DRAWN
 364     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 365         // first delete old items
 366         size_t ui = m_aItems.Count();
 367         while ( ui-- != 0 ) {
 368             delete m_aItems[ui];
 369         }
 370         m_aItems.Empty();
 371
 372         // then create new ones
 373         for (ui = 0; ui < (size_t)n; ui++) {
 374             wxOwnerDrawn *pNewItem = CreateItem(ui);
 375             pNewItem->SetName(choices[ui]);
 376             m_aItems.Add(pNewItem);
 377             ListBox_SetItemData(GetHwnd(), ui, pNewItem);
 378
 379             wxASSERT_MSG(clientData[ui] == NULL,
 380                     wxT("Can't use client data with owner-drawn listboxes"));
 381         }
 382     }
 383 #endif
 384
 385     SetHorizontalExtent("");
 386     ShowWindow(GetHwnd(), SW_SHOW);
 387 }
 388
 389 int wxListBox::FindString(const wxString& s) const
 390 {
 391     int pos = ListBox_FindStringExact(GetHwnd(), (WPARAM)-1, s);
 392     if (pos == LB_ERR)
 393         return -1;
 394     else
 395         return pos;
 396 }
 397
 398 void wxListBox::Clear()
 399 {
 400     ListBox_ResetContent(GetHwnd());
 401
 402 #if wxUSE_OWNER_DRAWN
 403     size_t uiCount = m_aItems.Count();
 404     while ( uiCount-- != 0 ) {
 405         delete m_aItems[uiCount];
 406     }
 407
 408     m_aItems.Clear();
 409 #endif // wxUSE_OWNER_DRAWN
 410
 411     m_noItems = 0;
 412     ListBox_GetHorizontalExtent(GetHwnd());
 413 }
 414
 415 void wxListBox::SetSelection(int N, bool select)
 416 {
 417     wxCHECK_RET( N >= 0 && N < m_noItems,
 418                  wxT("invalid index in wxListBox::SetSelection") );
 419
 420     if ((m_windowStyle & wxLB_MULTIPLE) || (m_windowStyle & wxLB_EXTENDED))
 421         SendMessage(GetHwnd(), LB_SETSEL, select, N);
 422     else
 423     {
 424         int N1 = N;
 425         if (!select)
 426             N1 = -1;
 427         SendMessage(GetHwnd(), LB_SETCURSEL, N1, 0);
 428     }
 429 }
 430
 431 bool wxListBox::Selected(int N) const
 432 {
 433     wxCHECK_MSG( N >= 0 && N < m_noItems, FALSE,
 434                  wxT("invalid index in wxListBox::Selected") );
 435
 436     return SendMessage(GetHwnd(), LB_GETSEL, N, 0) == 0 ? FALSE : TRUE;
 437 }
 438
 439 void wxListBox::Deselect(int N)
 440 {
 441     wxCHECK_RET( N >= 0 && N < m_noItems,
 442                  wxT("invalid index in wxListBox::Deselect") );
 443
 444     if ((m_windowStyle & wxLB_MULTIPLE) || (m_windowStyle & wxLB_EXTENDED))
 445         SendMessage(GetHwnd(), LB_SETSEL, FALSE, N);
 446 }
 447
 448 void *wxListBox::GetClientData(int N) const
 449 {
 450     wxCHECK_MSG( N >= 0 && N < m_noItems, NULL,
 451                  wxT("invalid index in wxListBox::GetClientData") );
 452
 453     return (void *)SendMessage(GetHwnd(), LB_GETITEMDATA, N, 0);
 454 }
 455
 456 void wxListBox::SetClientData(int N, void *Client_data)
 457 {
 458     wxCHECK_RET( N >= 0 && N < m_noItems,
 459                  wxT("invalid index in wxListBox::SetClientData") );
 460
 461     if ( ListBox_SetItemData(GetHwnd(), N, Client_data) == LB_ERR )
 462         wxLogDebug(wxT("LB_SETITEMDATA failed"));
 463 }
 464
 465 // Return number of selections and an array of selected integers
 466 int wxListBox::GetSelections(wxArrayInt& aSelections) const
 467 {
 468     aSelections.Empty();
 469
 470     if ((m_windowStyle & wxLB_MULTIPLE) || (m_windowStyle & wxLB_EXTENDED))
 471     {
 472         int no_sel = ListBox_GetSelCount(GetHwnd());
 473         if (no_sel != 0) {
 474             int *selections = new int[no_sel];
 475             if ( ListBox_GetSelItems(GetHwnd(), no_sel, selections) == LB_ERR ) {
 476                 wxFAIL_MSG(wxT("This listbox can't have single-selection style!"));
 477             }
 478
 479             aSelections.Alloc(no_sel);
 480             for ( int n = 0; n < no_sel; n++ )
 481                 aSelections.Add(selections[n]);
 482
 483             delete [] selections;
 484         }
 485
 486         return no_sel;
 487     }
 488     else  // single-selection listbox
 489     {
 490         aSelections.Add(ListBox_GetCurSel(GetHwnd()));
 491
 492         return 1;
 493     }
 494 }
 495
 496 // Get single selection, for single choice list items
 497 int wxListBox::GetSelection() const
 498 {
 499     wxCHECK_MSG( !(m_windowStyle & wxLB_MULTIPLE) &&
 500                  !(m_windowStyle & wxLB_EXTENDED),
 501                  -1,
 502                  wxT("GetSelection() can't be used with multiple-selection "
 503                     "listboxes, use GetSelections() instead.") );
 504
 505     return ListBox_GetCurSel(GetHwnd());
 506 }
 507
 508 // Find string for position
 509 wxString wxListBox::GetString(int N) const
 510 {
 511     wxCHECK_MSG( N >= 0 && N < m_noItems, "",
 512                  wxT("invalid index in wxListBox::GetClientData") );
 513
 514     int len = ListBox_GetTextLen(GetHwnd(), N);
 515
 516     // +1 for terminating NUL
 517     wxString result;
 518     ListBox_GetText(GetHwnd(), N, result.GetWriteBuf(len + 1));
 519     result.UngetWriteBuf();
 520
 521     return result;
 522 }
 523
 524 // Windows-specific code to set the horizontal extent of the listbox, if
 525 // necessary. If s is non-NULL, it's used to calculate the horizontal extent.
 526 // Otherwise, all strings are used.
 527 void wxListBox::SetHorizontalExtent(const wxString& s)
 528 {
 529     // Only necessary if we want a horizontal scrollbar
 530     if (!(m_windowStyle & wxHSCROLL))
 531         return;
 532     TEXTMETRIC lpTextMetric;
 533
 534     if (s != wxT(""))
 535     {
 536         int existingExtent = (int)SendMessage(GetHwnd(), LB_GETHORIZONTALEXTENT, 0, 0L);
 537         HDC dc = GetWindowDC(GetHwnd());
 538         HFONT oldFont = 0;
 539         if (GetFont().Ok() && GetFont().GetResourceHandle())
 540             oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
 541
 542         GetTextMetrics(dc, &lpTextMetric);
 543         SIZE extentXY;
 544         ::GetTextExtentPoint(dc, (LPTSTR) (const wxChar *)s, s.Length(), &extentXY);
 545         int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 546
 547         if (oldFont)
 548             ::SelectObject(dc, oldFont);
 549
 550         ReleaseDC(GetHwnd(), dc);
 551         if (extentX > existingExtent)
 552             SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(extentX), 0L);
 553         return;
 554     }
 555     else
 556     {
 557         int largestExtent = 0;
 558         HDC dc = GetWindowDC(GetHwnd());
 559         HFONT oldFont = 0;
 560         if (GetFont().Ok() && GetFont().GetResourceHandle())
 561             oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
 562
 563         GetTextMetrics(dc, &lpTextMetric);
 564         int i;
 565         for (i = 0; i < m_noItems; i++)
 566         {
 567             int len = (int)SendMessage(GetHwnd(), LB_GETTEXT, i, (LONG)wxBuffer);
 568             wxBuffer[len] = 0;
 569             SIZE extentXY;
 570             ::GetTextExtentPoint(dc, (LPTSTR)wxBuffer, len, &extentXY);
 571             int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 572             if (extentX > largestExtent)
 573                 largestExtent = extentX;
 574         }
 575         if (oldFont)
 576             ::SelectObject(dc, oldFont);
 577
 578         ReleaseDC(GetHwnd(), dc);
 579         SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(largestExtent), 0L);
 580     }
 581 }
 582
 583 void
 584 wxListBox::InsertItems(int nItems, const wxString items[], int pos)
 585 {
 586     wxCHECK_RET( pos >= 0 && pos <= m_noItems,
 587                  wxT("invalid index in wxListBox::InsertItems") );
 588
 589     int i;
 590     for (i = 0; i < nItems; i++)
 591         ListBox_InsertString(GetHwnd(), i + pos, items[i]);
 592     m_noItems += nItems;
 593
 594     SetHorizontalExtent(wxT(""));
 595 }
 596
 597 void wxListBox::SetString(int N, const wxString& s)
 598 {
 599     wxCHECK_RET( N >= 0 && N < m_noItems,
 600                  wxT("invalid index in wxListBox::SetString") );
 601
 602     int sel = -1;
 603     if (!(m_windowStyle & wxLB_MULTIPLE) && !(m_windowStyle & wxLB_EXTENDED))
 604         sel = GetSelection();
 605
 606     void *oldData = wxListBox::GetClientData(N);
 607
 608     SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);
 609
 610     int newN = N;
 611     if (N == (m_noItems - 1))
 612         newN = -1;
 613
 614     SendMessage(GetHwnd(), LB_INSERTSTRING, newN, (LPARAM) (const wxChar *)s);
 615     if (oldData)
 616         wxListBox::SetClientData(N, oldData);
 617
 618     // Selection may have changed
 619     if (sel >= 0)
 620         SetSelection(sel);
 621
 622 #if       wxUSE_OWNER_DRAWN
 623     if ( m_windowStyle & wxLB_OWNERDRAW )
 624         // update item's text
 625         m_aItems[N]->SetName(s);
 626 #endif  //USE_OWNER_DRAWN
 627 }
 628
 629 int wxListBox::Number () const
 630 {
 631     return m_noItems;
 632 }
 633
 634 // For single selection items only
 635 wxString wxListBox::GetStringSelection () const
 636 {
 637     int sel = GetSelection ();
 638     if (sel > -1)
 639         return this->GetString (sel);
 640     else
 641         return wxString("");
 642 }
 643
 644 bool wxListBox::SetStringSelection (const wxString& s, bool flag)
 645 {
 646     int sel = FindString (s);
 647     if (sel > -1)
 648     {
 649         SetSelection (sel, flag);
 650         return TRUE;
 651     }
 652     else
 653         return FALSE;
 654 }
 655
 656 wxSize wxListBox::DoGetBestSize()
 657 {
 658     // find the widest string
 659     int wLine;
 660     int wListbox = 0;
 661     for ( int i = 0; i < m_noItems; i++ )
 662     {
 663         wxString str(GetString(i));
 664         GetTextExtent(str, &wLine, NULL);
 665         if ( wLine > wListbox )
 666             wListbox = wLine;
 667     }
 668
 669     // give it some reasonable default value if there are no strings in the
 670     // list
 671     if ( wListbox == 0 )
 672         wListbox = 100;
 673
 674     // the listbox should be slightly larger than the widest string
 675     int cx, cy;
 676     wxGetCharSize(GetHWND(), &cx, &cy, &GetFont());
 677
 678     wListbox += 3*cx;
 679
 680     int hListbox = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy)*(wxMax(m_noItems, 7));
 681
 682     return wxSize(wListbox, hListbox);
 683 }
 684
 685 // Is this the right thing? Won't setselection generate a command
 686 // event too? No! It'll just generate a setselection event.
 687 // But we still can't have this being called whenever a real command
 688 // is generated, because it sets the selection, which will already
 689 // have been done! (Unless we have an optional argument for calling
 690 // by the actual window system, or a separate function, ProcessCommand)
 691 void wxListBox::Command (wxCommandEvent & event)
 692 {
 693     if (event.m_extraLong)
 694         SetSelection (event.m_commandInt);
 695     else
 696     {
 697         Deselect (event.m_commandInt);
 698         return;
 699     }
 700     ProcessCommand (event);
 701 }
 702
 703 WXHBRUSH wxListBox::OnCtlColor(WXHDC pDC, WXHWND pWnd, WXUINT nCtlColor,
 704         WXUINT message, WXWPARAM wParam, WXLPARAM lParam)
 705 {
 706 #if wxUSE_CTL3D
 707     if ( m_useCtl3D )
 708     {
 709         HBRUSH hbrush = Ctl3dCtlColorEx(message, wParam, lParam);
 710         return (WXHBRUSH) hbrush;
 711     }
 712 #endif
 713
 714     if (GetParent()->GetTransparentBackground())
 715         SetBkMode((HDC) pDC, TRANSPARENT);
 716     else
 717         SetBkMode((HDC) pDC, OPAQUE);
 718
 719     ::SetBkColor((HDC) pDC, RGB(GetBackgroundColour().Red(), GetBackgroundColour().Green(), GetBackgroundColour().Blue()));
 720     ::SetTextColor((HDC) pDC, RGB(GetForegroundColour().Red(), GetForegroundColour().Green(), GetForegroundColour().Blue()));
 721
 722     wxBrush *backgroundBrush = wxTheBrushList->FindOrCreateBrush(GetBackgroundColour(), wxSOLID);
 723
 724     // Note that this will be cleaned up in wxApp::OnIdle, if backgroundBrush
 725     // has a zero usage count.
 726     backgroundBrush->RealizeResource();
 727     return (WXHBRUSH) backgroundBrush->GetResourceHandle();
 728 }
 729
 730 long wxListBox::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam)
 731 {
 732     return wxControl::MSWWindowProc(nMsg, wParam, lParam);
 733 }
 734
 735 #if wxUSE_OWNER_DRAWN
 736
 737 // drawing
 738 // -------
 739
 740 // space beneath/above each row in pixels
 741 // "standard" checklistbox use 1 here, some might prefer 2. 0 is ugly.
 742 #define OWNER_DRAWN_LISTBOX_EXTRA_SPACE    (1)
 743
 744 // the height is the same for all items
 745 // TODO should be changed for LBS_OWNERDRAWVARIABLE style listboxes
 746
 747 // NB: can't forward this to wxListBoxItem because LB_SETITEMDATA
 748 //     message is not yet sent when we get here!
 749 bool wxListBox::MSWOnMeasure(WXMEASUREITEMSTRUCT *item)
 750 {
 751     // only owner-drawn control should receive this message
 752     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), FALSE );
 753
 754     MEASUREITEMSTRUCT *pStruct = (MEASUREITEMSTRUCT *)item;
 755
 756     wxDC dc;
 757     dc.SetHDC((WXHDC)CreateIC(wxT("DISPLAY"), NULL, NULL, 0));
 758     dc.SetFont(wxSystemSettings::GetSystemFont(wxSYS_ANSI_VAR_FONT));
 759
 760     pStruct->itemHeight = dc.GetCharHeight() + 2*OWNER_DRAWN_LISTBOX_EXTRA_SPACE;
 761     pStruct->itemWidth  = dc.GetCharWidth();
 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