src/msw/listbox.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/msw/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 #if wxUSE_LISTBOX
  24
  25 #ifndef WX_PRECOMP
  26 #include "wx/listbox.h"
  27 #include "wx/settings.h"
  28 #include "wx/brush.h"
  29 #include "wx/font.h"
  30 #include "wx/dc.h"
  31 #include "wx/utils.h"
  32 #endif
  33
  34 #include "wx/window.h"
  35 #include "wx/msw/private.h"
  36
  37 #include <windowsx.h>
  38
  39 #ifdef __WXWINE__
  40   #if defined(GetWindowStyle)
  41     #undef GetWindowStyle
  42   #endif
  43 #endif
  44
  45 #include "wx/dynarray.h"
  46 #include "wx/log.h"
  47
  48 #if wxUSE_OWNER_DRAWN
  49     #include  "wx/ownerdrw.h"
  50 #endif
  51
  52 #ifndef __TWIN32__
  53     #ifdef __GNUWIN32_OLD__
  54         #include "wx/msw/gnuwin32/extra.h"
  55     #endif
  56 #endif
  57
  58 #ifdef __WXWINE__
  59   #ifndef ListBox_SetItemData
  60     #define ListBox_SetItemData(hwndCtl, index, data) \
  61       ((int)(DWORD)SendMessage((hwndCtl), LB_SETITEMDATA, (WPARAM)(int)(index), (LPARAM)(data)))
  62   #endif
  63   #ifndef ListBox_GetHorizontalExtent
  64     #define ListBox_GetHorizontalExtent(hwndCtl) \
  65       ((int)(DWORD)SendMessage((hwndCtl), LB_GETHORIZONTALEXTENT, 0L, 0L))
  66   #endif
  67   #ifndef ListBox_GetSelCount
  68     #define ListBox_GetSelCount(hwndCtl) \
  69       ((int)(DWORD)SendMessage((hwndCtl), LB_GETSELCOUNT, 0L, 0L))
  70   #endif
  71   #ifndef ListBox_GetSelItems
  72     #define ListBox_GetSelItems(hwndCtl, cItems, lpItems) \
  73       ((int)(DWORD)SendMessage((hwndCtl), LB_GETSELITEMS, (WPARAM)(int)(cItems), (LPARAM)(int *)(lpItems)))
  74   #endif
  75   #ifndef ListBox_GetTextLen
  76     #define ListBox_GetTextLen(hwndCtl, index) \
  77       ((int)(DWORD)SendMessage((hwndCtl), LB_GETTEXTLEN, (WPARAM)(int)(index), 0L))
  78   #endif
  79   #ifndef ListBox_GetText
  80     #define ListBox_GetText(hwndCtl, index, lpszBuffer) \
  81       ((int)(DWORD)SendMessage((hwndCtl), LB_GETTEXT, (WPARAM)(int)(index), (LPARAM)(LPCTSTR)(lpszBuffer)))
  82   #endif
  83 #endif
  84
  85     IMPLEMENT_DYNAMIC_CLASS(wxListBox, wxControl)
  86
  87 // ============================================================================
  88 // list box item declaration and implementation
  89 // ============================================================================
  90
  91 #if wxUSE_OWNER_DRAWN
  92
  93 class wxListBoxItem : public wxOwnerDrawn
  94 {
  95 public:
  96     wxListBoxItem(const wxString& str = wxEmptyString);
  97 };
  98
  99 wxListBoxItem::wxListBoxItem(const wxString& str) : wxOwnerDrawn(str, FALSE)
 100 {
 101     // no bitmaps/checkmarks
 102     SetMarginWidth(0);
 103 }
 104
 105 wxOwnerDrawn *wxListBox::CreateLboxItem(size_t WXUNUSED(n))
 106 {
 107     return new wxListBoxItem();
 108 }
 109
 110 #endif  //USE_OWNER_DRAWN
 111
 112 // ============================================================================
 113 // list box control implementation
 114 // ============================================================================
 115
 116 // ----------------------------------------------------------------------------
 117 // creation
 118 // ----------------------------------------------------------------------------
 119
 120 // Listbox item
 121 wxListBox::wxListBox()
 122 {
 123     m_noItems = 0;
 124     m_selected = 0;
 125 }
 126
 127 bool wxListBox::Create(wxWindow *parent,
 128                        wxWindowID id,
 129                        const wxPoint& pos,
 130                        const wxSize& size,
 131                        int n, const wxString choices[],
 132                        long style,
 133                        const wxValidator& validator,
 134                        const wxString& name)
 135 {
 136     m_noItems = 0;
 137     m_hWnd = 0;
 138     m_selected = 0;
 139
 140     SetName(name);
 141 #if wxUSE_VALIDATORS
 142     SetValidator(validator);
 143 #endif // wxUSE_VALIDATORS
 144
 145     if (parent)
 146         parent->AddChild(this);
 147
 148     SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW));
 149     SetForegroundColour(parent->GetForegroundColour());
 150
 151     m_windowId = ( id == -1 ) ? (int)NewControlId() : id;
 152
 153     int x = pos.x;
 154     int y = pos.y;
 155     int width = size.x;
 156     int height = size.y;
 157     m_windowStyle = style;
 158
 159     DWORD wstyle = WS_VISIBLE | WS_VSCROLL | WS_TABSTOP |
 160                    LBS_NOTIFY | LBS_HASSTRINGS /* | WS_CLIPSIBLINGS */;
 161
 162     wxASSERT_MSG( !(style & wxLB_MULTIPLE) || !(style & wxLB_EXTENDED),
 163                   _T("only one of listbox selection modes can be specified") );
 164     if ( m_windowStyle & wxCLIP_SIBLINGS )
 165         wstyle |= WS_CLIPSIBLINGS;
 166
 167     if (m_windowStyle & wxLB_MULTIPLE)
 168         wstyle |= LBS_MULTIPLESEL;
 169     else if (m_windowStyle & wxLB_EXTENDED)
 170         wstyle |= LBS_EXTENDEDSEL;
 171
 172     if (m_windowStyle & wxLB_ALWAYS_SB)
 173         wstyle |= LBS_DISABLENOSCROLL;
 174     if (m_windowStyle & wxLB_HSCROLL)
 175         wstyle |= WS_HSCROLL;
 176     if (m_windowStyle & wxLB_SORT)
 177         wstyle |= LBS_SORT;
 178
 179 #if wxUSE_OWNER_DRAWN
 180     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 181         // we don't support LBS_OWNERDRAWVARIABLE yet
 182         wstyle |= LBS_OWNERDRAWFIXED;
 183     }
 184 #endif
 185
 186     // Without this style, you get unexpected heights, so e.g. constraint layout
 187     // doesn't work properly
 188     wstyle |= LBS_NOINTEGRALHEIGHT;
 189
 190     bool want3D;
 191     WXDWORD exStyle = Determine3DEffects(WS_EX_CLIENTEDGE, &want3D);
 192
 193     // Even with extended styles, need to combine with WS_BORDER for them to
 194     // look right.
 195     if ( want3D || wxStyleHasBorder(m_windowStyle) )
 196     {
 197         wstyle |= WS_BORDER;
 198     }
 199
 200     m_hWnd = (WXHWND)::CreateWindowEx(exStyle, wxT("LISTBOX"), NULL,
 201             wstyle | WS_CHILD,
 202             0, 0, 0, 0,
 203             (HWND)parent->GetHWND(), (HMENU)m_windowId,
 204             wxGetInstance(), NULL);
 205
 206     wxCHECK_MSG( m_hWnd, FALSE, wxT("Failed to create listbox") );
 207
 208 #if wxUSE_CTL3D
 209     if (want3D)
 210     {
 211         Ctl3dSubclassCtl(GetHwnd());
 212         m_useCtl3D = TRUE;
 213     }
 214 #endif
 215
 216     // Subclass again to catch messages
 217     SubclassWin(m_hWnd);
 218
 219     size_t ui;
 220     for (ui = 0; ui < (size_t)n; ui++) {
 221         Append(choices[ui]);
 222     }
 223
 224     if ( (m_windowStyle & wxLB_MULTIPLE) == 0 )
 225         SendMessage(GetHwnd(), LB_SETCURSEL, 0, 0);
 226
 227     SetFont(parent->GetFont());
 228
 229     SetSize(x, y, width, height);
 230
 231     return TRUE;
 232 }
 233
 234 wxListBox::~wxListBox()
 235 {
 236     Free();
 237 }
 238
 239 void wxListBox::SetupColours()
 240 {
 241     SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW));
 242     SetForegroundColour(GetParent()->GetForegroundColour());
 243 }
 244
 245 // ----------------------------------------------------------------------------
 246 // implementation of wxListBoxBase methods
 247 // ----------------------------------------------------------------------------
 248
 249 void wxListBox::DoSetFirstItem(int N)
 250 {
 251     wxCHECK_RET( N >= 0 && N < m_noItems,
 252                  wxT("invalid index in wxListBox::SetFirstItem") );
 253
 254     SendMessage(GetHwnd(), LB_SETTOPINDEX, (WPARAM)N, (LPARAM)0);
 255 }
 256
 257 void wxListBox::Delete(int N)
 258 {
 259     wxCHECK_RET( N >= 0 && N < m_noItems,
 260                  wxT("invalid index in wxListBox::Delete") );
 261
 262     // for owner drawn objects, the data is used for storing wxOwnerDrawn
 263     // pointers and we shouldn't touch it
 264 #if !wxUSE_OWNER_DRAWN
 265     if ( !(m_windowStyle & wxLB_OWNERDRAW) )
 266 #endif // !wxUSE_OWNER_DRAWN
 267         if ( HasClientObjectData() )
 268         {
 269             delete GetClientObject(N);
 270         }
 271
 272     SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);
 273     m_noItems--;
 274
 275     SetHorizontalExtent(wxEmptyString);
 276 }
 277
 278 int wxListBox::DoAppend(const wxString& item)
 279 {
 280     int index = ListBox_AddString(GetHwnd(), item);
 281     m_noItems++;
 282
 283 #if wxUSE_OWNER_DRAWN
 284     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 285         wxOwnerDrawn *pNewItem = CreateLboxItem(index); // dummy argument
 286         pNewItem->SetName(item);
 287         m_aItems.Insert(pNewItem, index);
 288         ListBox_SetItemData(GetHwnd(), index, pNewItem);
 289         pNewItem->SetFont(GetFont());
 290     }
 291 #endif // wxUSE_OWNER_DRAWN
 292
 293     SetHorizontalExtent(item);
 294
 295     return index;
 296 }
 297
 298 void wxListBox::DoSetItems(const wxArrayString& choices, void** clientData)
 299 {
 300     // avoid flicker - but don't need to do this for a hidden listbox
 301     bool hideAndShow = IsShown();
 302     if ( hideAndShow )
 303     {
 304         ShowWindow(GetHwnd(), SW_HIDE);
 305     }
 306
 307     ListBox_ResetContent(GetHwnd());
 308
 309     m_noItems = choices.GetCount();
 310     int i;
 311     for (i = 0; i < m_noItems; i++)
 312     {
 313         ListBox_AddString(GetHwnd(), choices[i]);
 314         if ( clientData )
 315         {
 316             SetClientData(i, clientData[i]);
 317         }
 318     }
 319
 320 #if wxUSE_OWNER_DRAWN
 321     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 322         // first delete old items
 323         WX_CLEAR_ARRAY(m_aItems);
 324
 325         // then create new ones
 326         for ( size_t ui = 0; ui < (size_t)m_noItems; ui++ ) {
 327             wxOwnerDrawn *pNewItem = CreateLboxItem(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     if ( hideAndShow )
 338     {
 339         // show the listbox back if we hid it
 340         ShowWindow(GetHwnd(), SW_SHOW);
 341     }
 342 }
 343
 344 int wxListBox::FindString(const wxString& s) const
 345 {
 346     int pos = ListBox_FindStringExact(GetHwnd(), (WPARAM)-1, s);
 347     if (pos == LB_ERR)
 348         return wxNOT_FOUND;
 349     else
 350         return pos;
 351 }
 352
 353 void wxListBox::Clear()
 354 {
 355     Free();
 356
 357     ListBox_ResetContent(GetHwnd());
 358
 359     m_noItems = 0;
 360     SetHorizontalExtent();
 361 }
 362
 363 void wxListBox::Free()
 364 {
 365 #if wxUSE_OWNER_DRAWN
 366     if ( m_windowStyle & wxLB_OWNERDRAW )
 367     {
 368         WX_CLEAR_ARRAY(m_aItems);
 369     }
 370     else
 371 #endif // wxUSE_OWNER_DRAWN
 372     if ( HasClientObjectData() )
 373     {
 374         for ( size_t n = 0; n < (size_t)m_noItems; n++ )
 375         {
 376             delete GetClientObject(n);
 377         }
 378     }
 379 }
 380
 381 void wxListBox::SetSelection(int N, bool select)
 382 {
 383     wxCHECK_RET( N >= 0 && N < m_noItems,
 384                  wxT("invalid index in wxListBox::SetSelection") );
 385
 386     if ( HasMultipleSelection() )
 387     {
 388         SendMessage(GetHwnd(), LB_SETSEL, select, N);
 389     }
 390     else
 391     {
 392         SendMessage(GetHwnd(), LB_SETCURSEL, select ? N : -1, 0);
 393     }
 394 }
 395
 396 bool wxListBox::IsSelected(int N) const
 397 {
 398     wxCHECK_MSG( N >= 0 && N < m_noItems, FALSE,
 399                  wxT("invalid index in wxListBox::Selected") );
 400
 401     return SendMessage(GetHwnd(), LB_GETSEL, N, 0) == 0 ? FALSE : TRUE;
 402 }
 403
 404 wxClientData* wxListBox::DoGetItemClientObject(int n) const
 405 {
 406     return (wxClientData *)DoGetItemClientData(n);
 407 }
 408
 409 void *wxListBox::DoGetItemClientData(int n) const
 410 {
 411     wxCHECK_MSG( n >= 0 && n < m_noItems, NULL,
 412                  wxT("invalid index in wxListBox::GetClientData") );
 413
 414     return (void *)SendMessage(GetHwnd(), LB_GETITEMDATA, n, 0);
 415 }
 416
 417 void wxListBox::DoSetItemClientObject(int n, wxClientData* clientData)
 418 {
 419     DoSetItemClientData(n, clientData);
 420 }
 421
 422 void wxListBox::DoSetItemClientData(int n, void *clientData)
 423 {
 424     wxCHECK_RET( n >= 0 && n < m_noItems,
 425                  wxT("invalid index in wxListBox::SetClientData") );
 426
 427 #if wxUSE_OWNER_DRAWN
 428     if ( m_windowStyle & wxLB_OWNERDRAW )
 429     {
 430         // client data must be pointer to wxOwnerDrawn, otherwise we would crash
 431         // in OnMeasure/OnDraw.
 432         wxFAIL_MSG(wxT("Can't use client data with owner-drawn listboxes"));
 433     }
 434 #endif // wxUSE_OWNER_DRAWN
 435
 436     if ( ListBox_SetItemData(GetHwnd(), n, clientData) == LB_ERR )
 437         wxLogDebug(wxT("LB_SETITEMDATA failed"));
 438 }
 439
 440 // Return number of selections and an array of selected integers
 441 int wxListBox::GetSelections(wxArrayInt& aSelections) const
 442 {
 443     aSelections.Empty();
 444
 445     if ( HasMultipleSelection() )
 446     {
 447         int countSel = ListBox_GetSelCount(GetHwnd());
 448         if ( countSel == LB_ERR )
 449         {
 450             wxLogDebug(_T("ListBox_GetSelCount failed"));
 451         }
 452         else if ( countSel != 0 )
 453         {
 454             int *selections = new int[countSel];
 455
 456             if ( ListBox_GetSelItems(GetHwnd(),
 457                                      countSel, selections) == LB_ERR )
 458             {
 459                 wxLogDebug(wxT("ListBox_GetSelItems failed"));
 460                 countSel = -1;
 461             }
 462             else
 463             {
 464                 aSelections.Alloc(countSel);
 465                 for ( int n = 0; n < countSel; n++ )
 466                     aSelections.Add(selections[n]);
 467             }
 468
 469             delete [] selections;
 470         }
 471
 472         return countSel;
 473     }
 474     else  // single-selection listbox
 475     {
 476         if (ListBox_GetCurSel(GetHwnd()) > -1)
 477             aSelections.Add(ListBox_GetCurSel(GetHwnd()));
 478
 479         return aSelections.Count();
 480     }
 481 }
 482
 483 // Get single selection, for single choice list items
 484 int wxListBox::GetSelection() const
 485 {
 486     wxCHECK_MSG( !HasMultipleSelection(),
 487                  -1,
 488                  wxT("GetSelection() can't be used with multiple-selection listboxes, use GetSelections() instead.") );
 489
 490     return ListBox_GetCurSel(GetHwnd());
 491 }
 492
 493 // Find string for position
 494 wxString wxListBox::GetString(int N) const
 495 {
 496     wxCHECK_MSG( N >= 0 && N < m_noItems, wxEmptyString,
 497                  wxT("invalid index in wxListBox::GetClientData") );
 498
 499     int len = ListBox_GetTextLen(GetHwnd(), N);
 500
 501     // +1 for terminating NUL
 502     wxString result;
 503     ListBox_GetText(GetHwnd(), N, result.GetWriteBuf(len + 1));
 504     result.UngetWriteBuf();
 505
 506     return result;
 507 }
 508
 509 void
 510 wxListBox::DoInsertItems(const wxArrayString& items, int pos)
 511 {
 512     wxCHECK_RET( pos >= 0 && pos <= m_noItems,
 513                  wxT("invalid index in wxListBox::InsertItems") );
 514
 515     int nItems = items.GetCount();
 516     for ( int i = 0; i < nItems; i++ )
 517     {
 518         int idx = ListBox_InsertString(GetHwnd(), i + pos, items[i]);
 519
 520 #if wxUSE_OWNER_DRAWN
 521         if ( m_windowStyle & wxLB_OWNERDRAW )
 522         {
 523             wxOwnerDrawn *pNewItem = CreateLboxItem(idx);
 524             pNewItem->SetName(items[i]);
 525             pNewItem->SetFont(GetFont());
 526             m_aItems.Insert(pNewItem, idx);
 527
 528             ListBox_SetItemData(GetHwnd(), idx, pNewItem);
 529         }
 530 #endif // wxUSE_OWNER_DRAWN
 531     }
 532
 533     m_noItems += nItems;
 534
 535     SetHorizontalExtent();
 536 }
 537
 538 void wxListBox::SetString(int N, const wxString& s)
 539 {
 540     wxCHECK_RET( N >= 0 && N < m_noItems,
 541                  wxT("invalid index in wxListBox::SetString") );
 542
 543     // remember the state of the item
 544     bool wasSelected = IsSelected(N);
 545
 546     void *oldData = NULL;
 547     wxClientData *oldObjData = NULL;
 548     if ( m_clientDataItemsType == wxClientData_Void )
 549         oldData = GetClientData(N);
 550     else if ( m_clientDataItemsType == wxClientData_Object )
 551         oldObjData = GetClientObject(N);
 552
 553     // delete and recreate it
 554     SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);
 555
 556     int newN = N;
 557     if ( N == m_noItems - 1 )
 558         newN = -1;
 559
 560     ListBox_InsertString(GetHwnd(), newN, s);
 561
 562     // restore the client data
 563     if ( oldData )
 564         SetClientData(N, oldData);
 565     else if ( oldObjData )
 566         SetClientObject(N, oldObjData);
 567
 568     // we may have lost the selection
 569     if ( wasSelected )
 570         Select(N);
 571
 572 #if wxUSE_OWNER_DRAWN
 573     if ( m_windowStyle & wxLB_OWNERDRAW )
 574     {
 575         // update item's text
 576         m_aItems[N]->SetName(s);
 577
 578         // reassign the item's data
 579         ListBox_SetItemData(GetHwnd(), N, m_aItems[N]);
 580     }
 581 #endif  //USE_OWNER_DRAWN
 582 }
 583
 584 int wxListBox::GetCount() const
 585 {
 586     return m_noItems;
 587 }
 588
 589 // ----------------------------------------------------------------------------
 590 // helpers
 591 // ----------------------------------------------------------------------------
 592
 593 // Windows-specific code to set the horizontal extent of the listbox, if
 594 // necessary. If s is non-NULL, it's used to calculate the horizontal extent.
 595 // Otherwise, all strings are used.
 596 void wxListBox::SetHorizontalExtent(const wxString& s)
 597 {
 598     // Only necessary if we want a horizontal scrollbar
 599     if (!(m_windowStyle & wxHSCROLL))
 600         return;
 601     TEXTMETRIC lpTextMetric;
 602
 603     if ( !s.IsEmpty() )
 604     {
 605         int existingExtent = (int)SendMessage(GetHwnd(), LB_GETHORIZONTALEXTENT, 0, 0L);
 606         HDC dc = GetWindowDC(GetHwnd());
 607         HFONT oldFont = 0;
 608         if (GetFont().Ok() && GetFont().GetResourceHandle())
 609             oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
 610
 611         GetTextMetrics(dc, &lpTextMetric);
 612         SIZE extentXY;
 613         ::GetTextExtentPoint(dc, (LPTSTR) (const wxChar *)s, s.Length(), &extentXY);
 614         int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 615
 616         if (oldFont)
 617             ::SelectObject(dc, oldFont);
 618
 619         ReleaseDC(GetHwnd(), dc);
 620         if (extentX > existingExtent)
 621             SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(extentX), 0L);
 622     }
 623     else
 624     {
 625         int largestExtent = 0;
 626         HDC dc = GetWindowDC(GetHwnd());
 627         HFONT oldFont = 0;
 628         if (GetFont().Ok() && GetFont().GetResourceHandle())
 629             oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
 630
 631         GetTextMetrics(dc, &lpTextMetric);
 632         int i;
 633         for (i = 0; i < m_noItems; i++)
 634         {
 635             int len = (int)SendMessage(GetHwnd(), LB_GETTEXT, i, (LONG)wxBuffer);
 636             wxBuffer[len] = 0;
 637             SIZE extentXY;
 638             ::GetTextExtentPoint(dc, (LPTSTR)wxBuffer, len, &extentXY);
 639             int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 640             if (extentX > largestExtent)
 641                 largestExtent = extentX;
 642         }
 643         if (oldFont)
 644             ::SelectObject(dc, oldFont);
 645
 646         ReleaseDC(GetHwnd(), dc);
 647         SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(largestExtent), 0L);
 648     }
 649 }
 650
 651 wxSize wxListBox::DoGetBestSize() const
 652 {
 653     // find the widest string
 654     int wLine;
 655     int wListbox = 0;
 656     for ( int i = 0; i < m_noItems; i++ )
 657     {
 658         wxString str(GetString(i));
 659         GetTextExtent(str, &wLine, NULL);
 660         if ( wLine > wListbox )
 661             wListbox = wLine;
 662     }
 663
 664     // give it some reasonable default value if there are no strings in the
 665     // list
 666     if ( wListbox == 0 )
 667         wListbox = 100;
 668
 669     // the listbox should be slightly larger than the widest string
 670     int cx, cy;
 671     wxGetCharSize(GetHWND(), &cx, &cy, &GetFont());
 672
 673     wListbox += 3*cx;
 674
 675     // don't make the listbox too tall (limit height to 10 items) but don't
 676     // make it too small neither
 677     int hListbox = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy)*
 678                     wxMin(wxMax(m_noItems, 3), 10);
 679
 680     return wxSize(wListbox, hListbox);
 681 }
 682
 683 // ----------------------------------------------------------------------------
 684 // callbacks
 685 // ----------------------------------------------------------------------------
 686
 687 bool wxListBox::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 688 {
 689     wxEventType evtType;
 690     if ( param == LBN_SELCHANGE )
 691     {
 692         evtType = wxEVT_COMMAND_LISTBOX_SELECTED;
 693     }
 694     else if ( param == LBN_DBLCLK )
 695     {
 696         evtType = wxEVT_COMMAND_LISTBOX_DOUBLECLICKED;
 697     }
 698     else
 699     {
 700         // some event we're not interested in
 701         return FALSE;
 702     }
 703
 704     wxCommandEvent event(evtType, m_windowId);
 705     event.SetEventObject( this );
 706
 707     wxArrayInt aSelections;
 708     int n, count = GetSelections(aSelections);
 709     if ( count > 0 )
 710     {
 711         n = aSelections[0];
 712         if ( HasClientObjectData() )
 713             event.SetClientObject( GetClientObject(n) );
 714         else if ( HasClientUntypedData() )
 715             event.SetClientData( GetClientData(n) );
 716         event.SetString( GetString(n) );
 717     }
 718     else
 719     {
 720         n = -1;
 721     }
 722
 723     event.m_commandInt = n;
 724
 725     return GetEventHandler()->ProcessEvent(event);
 726 }
 727
 728 // ----------------------------------------------------------------------------
 729 // wxCheckListBox support
 730 // ----------------------------------------------------------------------------
 731
 732 #if wxUSE_OWNER_DRAWN
 733
 734 // drawing
 735 // -------
 736
 737 // space beneath/above each row in pixels
 738 // "standard" checklistbox use 1 here, some might prefer 2. 0 is ugly.
 739 #define OWNER_DRAWN_LISTBOX_EXTRA_SPACE    (1)
 740
 741 // the height is the same for all items
 742 // TODO should be changed for LBS_OWNERDRAWVARIABLE style listboxes
 743
 744 // NB: can't forward this to wxListBoxItem because LB_SETITEMDATA
 745 //     message is not yet sent when we get here!
 746 bool wxListBox::MSWOnMeasure(WXMEASUREITEMSTRUCT *item)
 747 {
 748     // only owner-drawn control should receive this message
 749     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), FALSE );
 750
 751     MEASUREITEMSTRUCT *pStruct = (MEASUREITEMSTRUCT *)item;
 752
 753     HDC hdc = CreateIC(wxT("DISPLAY"), NULL, NULL, 0);
 754
 755     wxDC dc;
 756     dc.SetHDC((WXHDC)hdc);
 757     dc.SetFont(wxSystemSettings::GetFont(wxSYS_ANSI_VAR_FONT));
 758
 759     pStruct->itemHeight = dc.GetCharHeight() + 2*OWNER_DRAWN_LISTBOX_EXTRA_SPACE;
 760     pStruct->itemWidth  = dc.GetCharWidth();
 761
 762     dc.SetHDC(0);
 763
 764     DeleteDC(hdc);
 765
 766     return TRUE;
 767 }
 768
 769 // forward the message to the appropriate item
 770 bool wxListBox::MSWOnDraw(WXDRAWITEMSTRUCT *item)
 771 {
 772     // only owner-drawn control should receive this message
 773     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), FALSE );
 774
 775     DRAWITEMSTRUCT *pStruct = (DRAWITEMSTRUCT *)item;
 776     UINT itemID = pStruct->itemID;
 777
 778     // the item may be -1 for an empty listbox
 779     if ( itemID == (UINT)-1 )
 780         return FALSE;
 781
 782     long data = ListBox_GetItemData(GetHwnd(), pStruct->itemID);
 783
 784     wxCHECK( data && (data != LB_ERR), FALSE );
 785
 786     wxListBoxItem *pItem = (wxListBoxItem *)data;
 787
 788     wxDCTemp dc((WXHDC)pStruct->hDC);
 789     wxRect rect(wxPoint(pStruct->rcItem.left, pStruct->rcItem.top),
 790                 wxPoint(pStruct->rcItem.right, pStruct->rcItem.bottom));
 791
 792     return pItem->OnDrawItem(dc, rect,
 793                              (wxOwnerDrawn::wxODAction)pStruct->itemAction,
 794                              (wxOwnerDrawn::wxODStatus)pStruct->itemState);
 795 }
 796
 797 #endif // wxUSE_OWNER_DRAWN
 798
 799 #endif // wxUSE_LISTBOX