src/os2/listbox.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        listbox.cpp
   3 // Purpose:     wxListBox
   4 // Author:      David Webster
   5 // Modified by:
   6 // Created:     10/09/99
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) David Webster
   9 // Licence:     wxWindows licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 // For compilers that support precompilation, includes "wx.h".
  13 #include "wx/wxprec.h"
  14
  15 #include "wx/window.h"
  16 #include "wx/os2/private.h"
  17
  18 #ifndef WX_PRECOMP
  19 #include "wx/listbox.h"
  20 #include "wx/settings.h"
  21 #include "wx/brush.h"
  22 #include "wx/font.h"
  23 #include "wx/dc.h"
  24 #include "wx/utils.h"
  25 #endif
  26
  27 #define INCL_M
  28 #include <os2.h>
  29
  30 #include "wx/dynarray.h"
  31 #include "wx/log.h"
  32
  33 #if wxUSE_LISTBOX
  34
  35 #if wxUSE_OWNER_DRAWN
  36     #include  "wx/ownerdrw.h"
  37 #endif
  38
  39   IMPLEMENT_DYNAMIC_CLASS(wxListBox, wxControl)
  40
  41 // ============================================================================
  42 // list box item declaration and implementation
  43 // ============================================================================
  44
  45 #if wxUSE_OWNER_DRAWN
  46
  47 class wxListBoxItem : public wxOwnerDrawn
  48 {
  49 public:
  50     wxListBoxItem(const wxString& rsStr = "");
  51 };
  52
  53 wxListBoxItem::wxListBoxItem(
  54   const wxString& rsStr
  55 )
  56 : wxOwnerDrawn( rsStr
  57                ,FALSE
  58               )
  59 {
  60     //
  61     // No bitmaps/checkmarks
  62     //
  63     SetMarginWidth(0);
  64 } // end of wxListBoxItem::wxListBoxItem
  65
  66 wxOwnerDrawn* wxListBox::CreateItem(
  67   size_t                            n
  68 )
  69 {
  70     return new wxListBoxItem();
  71 } // end of wxListBox::CreateItem
  72
  73 #endif  //USE_OWNER_DRAWN
  74
  75 // ============================================================================
  76 // list box control implementation
  77 // ============================================================================
  78
  79 // Listbox item
  80 wxListBox::wxListBox()
  81 {
  82     m_nNumItems = 0;
  83     m_nSelected = 0;
  84 } // end of wxListBox::wxListBox
  85
  86 bool wxListBox::Create(
  87   wxWindow*                         pParent
  88 , wxWindowID                        vId
  89 , const wxPoint&                    rPos
  90 , const wxSize&                     rSize
  91 , int                               n
  92 , const wxString                    asChoices[]
  93 , long                              lStyle
  94 #if wxUSE_VALIDATORS
  95 , const wxValidator&                rValidator
  96 #endif
  97 , const wxString&                   rsName
  98 )
  99 {
 100     m_nNumItems = 0;
 101     m_hWnd      = 0;
 102     m_nSelected = 0;
 103
 104     SetName(rsName);
 105 #if wxUSE_VALIDATORS
 106     SetValidator(rValidator);
 107 #endif
 108
 109     if (pParent)
 110         pParent->AddChild(this);
 111
 112     wxSystemSettings                vSettings;
 113
 114     SetBackgroundColour(vSettings.GetSystemColour(wxSYS_COLOUR_WINDOW));
 115     SetForegroundColour(pParent->GetForegroundColour());
 116
 117     m_windowId = (vId == -1) ? (int)NewControlId() : vId;
 118
 119     int                             nX      = rPos.x;
 120     int                             nY      = rPos.y;
 121     int                             nWidth  = rSize.x;
 122     int                             nHeight = rSize.y;
 123
 124     m_windowStyle = lStyle;
 125
 126     lStyle = WS_VISIBLE;
 127
 128     if (m_windowStyle & wxCLIP_SIBLINGS )
 129         lStyle |= WS_CLIPSIBLINGS;
 130     if (m_windowStyle & wxLB_MULTIPLE)
 131         lStyle |= LS_MULTIPLESEL;
 132     else if (m_windowStyle & wxLB_EXTENDED)
 133         lStyle |= LS_EXTENDEDSEL;
 134     if (m_windowStyle & wxLB_HSCROLL)
 135         lStyle |= LS_HORZSCROLL;
 136     if (m_windowStyle & wxLB_OWNERDRAW)
 137         lStyle |= LS_OWNERDRAW;
 138
 139     //
 140     // Without this style, you get unexpected heights, so e.g. constraint layout
 141     // doesn't work properly
 142     //
 143     lStyle |= LS_NOADJUSTPOS;
 144
 145     //
 146     // If the parent is a scrolled window the controls must
 147     // have this style or they will overlap the scrollbars
 148     //
 149     if (pParent)
 150         if (pParent->IsKindOf(CLASSINFO(wxScrolledWindow)) ||
 151             pParent->IsKindOf(CLASSINFO(wxGenericScrolledWindow)))
 152             lStyle |= WS_CLIPSIBLINGS;
 153
 154     m_hWnd = (WXHWND)::WinCreateWindow( GetWinHwnd(pParent) // Parent
 155                                        ,WC_LISTBOX          // Default Listbox class
 156                                        ,"LISTBOX"           // Control's name
 157                                        ,lStyle              // Initial Style
 158                                        ,0, 0, 0, 0          // Position and size
 159                                        ,GetWinHwnd(pParent) // Owner
 160                                        ,HWND_TOP            // Z-Order
 161                                        ,(HMENU)m_windowId   // Id
 162                                        ,NULL                // Control Data
 163                                        ,NULL                // Presentation Parameters
 164                                       );
 165     if (m_hWnd == 0)
 166     {
 167         return FALSE;
 168     }
 169
 170     //
 171     // Subclass again for purposes of dialog editing mode
 172     //
 173     SubclassWin(m_hWnd);
 174
 175     LONG                            lUi;
 176
 177     for (lUi = 0; lUi < (LONG)n; lUi++)
 178     {
 179         Append(asChoices[lUi]);
 180     }
 181     SetFont(pParent->GetFont());
 182
 183     //
 184     // Set standard wxWindows colors for Listbox items and highlighting
 185     //
 186     wxColour                        vColour;
 187
 188     vColour.Set(wxString("WHITE"));
 189
 190     LONG                            lColor = (LONG)vColour.GetPixel();
 191
 192     ::WinSetPresParam( m_hWnd
 193                       ,PP_HILITEFOREGROUNDCOLOR
 194                       ,sizeof(LONG)
 195                       ,(PVOID)&lColor
 196                      );
 197     vColour.Set(wxString("NAVY"));
 198     lColor = (LONG)vColour.GetPixel();
 199     ::WinSetPresParam( m_hWnd
 200                       ,PP_HILITEBACKGROUNDCOLOR
 201                       ,sizeof(LONG)
 202                       ,(PVOID)&lColor
 203                      );
 204
 205     SetSize( nX
 206             ,nY
 207             ,nWidth
 208             ,nHeight
 209            );
 210     return TRUE;
 211 } // end of wxListBox::Create
 212
 213 wxListBox::~wxListBox()
 214 {
 215 #if wxUSE_OWNER_DRAWN
 216     size_t                          lUiCount = m_aItems.Count();
 217
 218     while (lUiCount-- != 0)
 219     {
 220         delete m_aItems[lUiCount];
 221     }
 222 #endif // wxUSE_OWNER_DRAWN
 223 } // end of wxListBox::~wxListBox
 224
 225 void wxListBox::SetupColours()
 226 {
 227     SetBackgroundColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_WINDOW));
 228     SetForegroundColour(GetParent()->GetForegroundColour());
 229 } // end of wxListBox::SetupColours
 230
 231 // ----------------------------------------------------------------------------
 232 // implementation of wxListBoxBase methods
 233 // ----------------------------------------------------------------------------
 234
 235 void wxListBox::DoSetFirstItem(
 236   int                               N
 237 )
 238 {
 239     wxCHECK_RET( N >= 0 && N < m_nNumItems,
 240                  wxT("invalid index in wxListBox::SetFirstItem") );
 241
 242     ::WinSendMsg(GetHwnd(), LM_SETTOPINDEX, MPFROMLONG(N), (MPARAM)0);
 243 } // end of wxListBox::DoSetFirstItem
 244
 245 void wxListBox::Delete(
 246   int                               N
 247 )
 248 {
 249     wxCHECK_RET( N >= 0 && N < m_nNumItems,
 250                  wxT("invalid index in wxListBox::Delete") );
 251
 252 #if wxUSE_OWNER_DRAWN
 253     delete m_aItems[N];
 254     m_aItems.RemoveAt(N);
 255 #else // !wxUSE_OWNER_DRAWN
 256     if (HasClientObjectData())
 257     {
 258         delete GetClientObject(N);
 259     }
 260 #endif // wxUSE_OWNER_DRAWN/!wxUSE_OWNER_DRAWN
 261
 262     ::WinSendMsg(GetHwnd(), LM_DELETEITEM, (MPARAM)N, (MPARAM)0);
 263     m_nNumItems--;
 264 } // end of wxListBox::DoSetFirstItem
 265
 266 int wxListBox::DoAppend(
 267   const wxString&                   rsItem
 268 )
 269 {
 270     int                             nIndex = 0;
 271     SHORT                           nIndexType = 0;
 272
 273     if (m_windowStyle & wxLB_SORT)
 274         nIndexType = LIT_SORTASCENDING;
 275     else
 276         nIndexType = LIT_END;
 277     nIndex = (int)::WinSendMsg(GetHwnd(), LM_INSERTITEM, (MPARAM)nIndexType, (MPARAM)rsItem.c_str());
 278     m_nNumItems++;
 279
 280 #if wxUSE_OWNER_DRAWN
 281     if (m_windowStyle & wxLB_OWNERDRAW)
 282     {
 283         wxOwnerDrawn*               pNewItem = CreateItem(nIndex); // dummy argument
 284
 285         pNewItem->SetName(rsItem);
 286         m_aItems.Add(pNewItem);
 287         ::WinSendMsg(GetHwnd(), LM_SETITEMHANDLE, (MPARAM)((SHORT)nIndex), MPFROMP(pNewItem));
 288         pNewItem->SetFont(GetFont());
 289     }
 290 #endif
 291     return nIndex;
 292 } // end of wxListBox::DoAppend
 293
 294 void wxListBox::DoSetItems(
 295   const wxArrayString&              raChoices
 296 , void**                            ppClientData
 297 )
 298 {
 299     BOOL                            bHideAndShow = IsShown();
 300     int                             nCount = 0;
 301     int                             i;
 302     SHORT                           nIndexType = 0;
 303
 304     if (bHideAndShow)
 305     {
 306         ::WinShowWindow(GetHwnd(), FALSE);
 307     }
 308     ::WinSendMsg(GetHwnd(), LM_DELETEALL, (MPARAM)0, (MPARAM)0);
 309     m_nNumItems = raChoices.GetCount();
 310     for (i = 0; i < m_nNumItems; i++)
 311     {
 312
 313         if (m_windowStyle & wxLB_SORT)
 314             nIndexType = LIT_SORTASCENDING;
 315         else
 316             nIndexType = LIT_END;
 317         ::WinSendMsg(GetHwnd(), LM_INSERTITEM, (MPARAM)nIndexType, (MPARAM)raChoices[i].c_str());
 318
 319         if (ppClientData)
 320         {
 321 #if wxUSE_OWNER_DRAWN
 322             wxASSERT_MSG(ppClientData[i] == NULL,
 323                          wxT("Can't use client data with owner-drawn listboxes"));
 324 #else // !wxUSE_OWNER_DRAWN
 325             ::WinSendMsg(WinUtil_GetHwnd(), LM_SETITEMHANDLE, MPFROMLONG(lCount), MPFROMP(ppClientData[i]));
 326 #endif // wxUSE_OWNER_DRAWN/!wxUSE_OWNER_DRAWN
 327         }
 328     }
 329
 330 #if wxUSE_OWNER_DRAWN
 331     if ( m_windowStyle & wxLB_OWNERDRAW )
 332     {
 333         //
 334         // First delete old items
 335         //
 336         size_t                      lUi = m_aItems.Count();
 337
 338         while (lUi-- != 0)
 339         {
 340             delete m_aItems[lUi];
 341         }
 342         m_aItems.Empty();
 343
 344         //
 345         // Then create new ones
 346         //
 347         for (lUi = 0; lUi < (size_t)m_nNumItems; lUi++)
 348         {
 349             wxOwnerDrawn*           pNewItem = CreateItem(lUi);
 350
 351             pNewItem->SetName(raChoices[lUi]);
 352             m_aItems.Add(pNewItem);
 353             ::WinSendMsg(GetHwnd(), LM_SETITEMHANDLE, MPFROMLONG(lUi), MPFROMP(pNewItem));
 354         }
 355     }
 356 #endif // wxUSE_OWNER_DRAWN
 357     ::WinShowWindow(GetHwnd(), TRUE);
 358 } // end of wxListBox::DoSetItems
 359
 360 int wxListBox::FindString(
 361   const wxString&                   rsString
 362 ) const
 363 {
 364     int                             nPos;
 365     LONG                            lTextLength;
 366     PSZ                             zStr;
 367
 368
 369     for (nPos = 0; nPos < m_nNumItems; nPos++)
 370     {
 371         lTextLength = LONGFROMMR(::WinSendMsg(GetHwnd(), LM_QUERYITEMTEXTLENGTH, (MPARAM)nPos, (MPARAM)0));
 372         zStr = new char[lTextLength + 1];
 373         ::WinSendMsg(GetHwnd(), LM_QUERYITEMTEXT, MPFROM2SHORT(nPos, (SHORT)lTextLength), (MPARAM)zStr);
 374         if (rsString == (char*)zStr)
 375         {
 376             delete [] zStr;
 377             break;
 378         }
 379         delete [] zStr;
 380     }
 381     return nPos;
 382 } // end of wxListBox::FindString
 383
 384 void wxListBox::Clear()
 385 {
 386 #if wxUSE_OWNER_DRAWN
 387     size_t                          lUiCount = m_aItems.Count();
 388
 389     while (lUiCount-- != 0)
 390     {
 391         delete m_aItems[lUiCount];
 392     }
 393
 394     m_aItems.Clear();
 395 #else // !wxUSE_OWNER_DRAWN
 396     if (HasClientObjectData())
 397     {
 398         for (size_t n = 0; n < (size_t)m_lNumItems; n++)
 399         {
 400             delete GetClientObject(n);
 401         }
 402     }
 403 #endif // wxUSE_OWNER_DRAWN/!wxUSE_OWNER_DRAWN
 404     ::WinSendMsg(GetHwnd(), LM_DELETEALL, (MPARAM)0, (MPARAM)0);
 405
 406     m_nNumItems = 0;
 407 } // end of wxListBox::Clear
 408
 409 void wxListBox::SetSelection(
 410   int                               N
 411 , bool                              bSelect
 412 )
 413 {
 414     wxCHECK_RET( N >= 0 && N < m_nNumItems,
 415                  wxT("invalid index in wxListBox::SetSelection") );
 416     ::WinSendMsg( GetHwnd()
 417                  ,LM_SELECTITEM
 418                  ,MPFROMLONG(N)
 419                  ,(MPARAM)bSelect
 420                 );
 421 } // end of wxListBox::SetSelection
 422
 423 bool wxListBox::IsSelected(
 424   int                               N
 425 ) const
 426 {
 427     wxCHECK_MSG( N >= 0 && N < m_nNumItems, FALSE,
 428                  wxT("invalid index in wxListBox::Selected") );
 429
 430     LONG                            lItem;
 431
 432     lItem = LONGFROMMR(::WinSendMsg(GetHwnd(), LM_QUERYSELECTION, (MPARAM)N, (MPARAM)0));
 433     return (lItem != LIT_NONE);
 434 } // end of wxListBox::IsSelected
 435
 436 wxClientData* wxListBox::DoGetItemClientObject(
 437   int                               n
 438 ) const
 439 {
 440     return (wxClientData *)DoGetItemClientData(n);
 441 }
 442
 443 void* wxListBox::DoGetItemClientData(
 444   int                               n
 445 ) const
 446 {
 447     wxCHECK_MSG( n >= 0 && n < m_nNumItems, NULL,
 448                  wxT("invalid index in wxListBox::GetClientData") );
 449
 450     return((void *)::WinSendMsg(GetHwnd(), LM_QUERYITEMHANDLE, MPFROMLONG(n), (MPARAM)0));
 451 } // end of wxListBox::DoGetItemClientData
 452
 453 void wxListBox::DoSetItemClientObject(
 454   int                               n
 455 , wxClientData*                     pClientData
 456 )
 457 {
 458     DoSetItemClientData( n
 459                         ,pClientData
 460                        );
 461 } // end of wxListBox::DoSetItemClientObject
 462
 463 void wxListBox::DoSetItemClientData(
 464   int                               n
 465 , void*                             pClientData
 466 )
 467 {
 468     wxCHECK_RET( n >= 0 && n < m_nNumItems,
 469                  wxT("invalid index in wxListBox::SetClientData") );
 470
 471 #if wxUSE_OWNER_DRAWN
 472     if ( m_windowStyle & wxLB_OWNERDRAW )
 473     {
 474         //
 475         // Client data must be pointer to wxOwnerDrawn, otherwise we would crash
 476         // in OnMeasure/OnDraw.
 477         //
 478         wxFAIL_MSG(wxT("Can't use client data with owner-drawn listboxes"));
 479     }
 480 #endif // wxUSE_OWNER_DRAWN
 481
 482     ::WinSendMsg(GetHwnd(), LM_SETITEMHANDLE, MPFROMLONG(n), MPFROMP(pClientData));
 483 } // end of wxListBox::DoSetItemClientData
 484
 485 bool wxListBox::HasMultipleSelection() const
 486 {
 487     return (m_windowStyle & wxLB_MULTIPLE) || (m_windowStyle & wxLB_EXTENDED);
 488 } // end of wxListBox::HasMultipleSelection
 489
 490 int wxListBox::GetSelections(
 491   wxArrayInt&                       raSelections
 492 ) const
 493 {
 494     int                             nCount = 0;
 495     LONG                            lItem;
 496
 497
 498     raSelections.Empty();
 499     if (HasMultipleSelection())
 500     {
 501         lItem = LONGFROMMR(::WinSendMsg( GetHwnd()
 502                                         ,LM_QUERYSELECTION
 503                                         ,(MPARAM)LIT_FIRST
 504                                         ,(MPARAM)0
 505                                        )
 506                           );
 507         if (lItem != LIT_NONE)
 508         {
 509             nCount++;
 510             while ((lItem = LONGFROMMR(::WinSendMsg( GetHwnd()
 511                                                     ,LM_QUERYSELECTION
 512                                                     ,(MPARAM)lItem
 513                                                     ,(MPARAM)0
 514                                                    )
 515                                       )) != LIT_NONE)
 516             {
 517                 nCount++;
 518             }
 519             raSelections.Alloc(nCount);
 520             lItem = LONGFROMMR(::WinSendMsg( GetHwnd()
 521                                             ,LM_QUERYSELECTION
 522                                             ,(MPARAM)LIT_FIRST
 523                                             ,(MPARAM)0
 524                                            )
 525                               );
 526
 527             raSelections.Add((int)lItem);
 528             while ((lItem = LONGFROMMR(::WinSendMsg( GetHwnd()
 529                                                     ,LM_QUERYSELECTION
 530                                                     ,(MPARAM)lItem
 531                                                     ,(MPARAM)0
 532                                                    )
 533                                       )) != LIT_NONE)
 534             {
 535                 raSelections.Add((int)lItem);
 536             }
 537             return nCount;
 538         }
 539         return 0;
 540     }
 541     else  // single-selection listbox
 542     {
 543         lItem = LONGFROMMR(::WinSendMsg( GetHwnd()
 544                                         ,LM_QUERYSELECTION
 545                                         ,(MPARAM)LIT_FIRST
 546                                         ,(MPARAM)0
 547                                        )
 548                           );
 549         raSelections.Add((int)lItem);
 550         return 1;
 551     }
 552     return 0;
 553 } // end of wxListBox::GetSelections
 554
 555 int wxListBox::GetSelection() const
 556 {
 557     wxCHECK_MSG( !HasMultipleSelection(),
 558                  -1,
 559                  wxT("GetSelection() can't be used with multiple-selection "
 560                     "listboxes, use GetSelections() instead.") );
 561
 562     return(LONGFROMMR(::WinSendMsg( GetHwnd()
 563                                    ,LM_QUERYSELECTION
 564                                    ,(MPARAM)LIT_FIRST
 565                                    ,(MPARAM)0
 566                                   )
 567                      ));
 568 } // end of wxListBox::GetSelection
 569
 570 wxString wxListBox::GetString(
 571   int                               N
 572 ) const
 573 {
 574     LONG                            lLen = 0;
 575     char*                           zBuf;
 576     wxString                        sResult;
 577
 578     wxCHECK_MSG( N >= 0 && N < m_nNumItems, "",
 579                  wxT("invalid index in wxListBox::GetClientData") );
 580
 581     lLen = LONGFROMMR(::WinSendMsg(GetHwnd(), LM_QUERYITEMTEXTLENGTH, (MPARAM)N, (MPARAM)0));
 582     zBuf = new char[lLen + 1];
 583     ::WinSendMsg(GetHwnd(), LM_QUERYITEMTEXT, MPFROM2SHORT((SHORT)N, (SHORT)lLen), (MPARAM)zBuf);
 584     zBuf[lLen] = '\0';
 585     sResult = zBuf;
 586     delete [] zBuf;
 587     return sResult;
 588 } // end of wxListBox::GetString
 589
 590 void wxListBox::DoInsertItems(
 591   const wxArrayString&              asItems
 592 , int                               nPos
 593 )
 594 {
 595     wxCHECK_RET( nPos >= 0 && nPos <= m_nNumItems,
 596                  wxT("invalid index in wxListBox::InsertItems") );
 597
 598     int                             nItems = asItems.GetCount();
 599
 600     for (int i = 0; i < nItems; i++)
 601         ::WinSendMsg(GetHwnd(), LM_INSERTITEM, MPFROMLONG((LONG)(i + nPos)), (MPARAM)asItems[i].c_str());
 602     m_nNumItems += nItems;
 603 } // end of wxListBox::DoInsertItems
 604
 605 void wxListBox::SetString(
 606   int                               N
 607 , const wxString&                   rsString
 608 )
 609 {
 610     wxCHECK_RET( N >= 0 && N < m_nNumItems,
 611                  wxT("invalid index in wxListBox::SetString") );
 612
 613     //
 614     // Remember the state of the item
 615     //
 616     bool                            bWasSelected = IsSelected(N);
 617     void*                           pOldData = NULL;
 618     wxClientData*                   pOldObjData = NULL;
 619
 620     if (m_clientDataItemsType == wxClientData_Void)
 621         pOldData = GetClientData(N);
 622     else if (m_clientDataItemsType == wxClientData_Object)
 623         pOldObjData = GetClientObject(N);
 624
 625     //
 626     // Delete and recreate it
 627     //
 628     ::WinSendMsg( GetHwnd()
 629                  ,LM_DELETEITEM
 630                  ,(MPARAM)N
 631                  ,(MPARAM)0
 632                 );
 633
 634     int                             nNewN = N;
 635
 636     if (N == m_nNumItems - 1)
 637         nNewN = -1;
 638
 639     ::WinSendMsg( GetHwnd()
 640                  ,LM_INSERTITEM
 641                  ,(MPARAM)nNewN
 642                  ,(MPARAM)rsString.c_str()
 643                 );
 644
 645     //
 646     // Restore the client data
 647     //
 648     if (pOldData)
 649         SetClientData( N
 650                       ,pOldData
 651                      );
 652     else if (pOldObjData)
 653         SetClientObject( N
 654                         ,pOldObjData
 655                        );
 656
 657     //
 658     // We may have lost the selection
 659     //
 660     if (bWasSelected)
 661         Select(N);
 662
 663 #if wxUSE_OWNER_DRAWN
 664     if (m_windowStyle & wxLB_OWNERDRAW)
 665         //
 666         // Update item's text
 667         //
 668         m_aItems[N]->SetName(rsString);
 669 #endif  //USE_OWNER_DRAWN
 670 } // end of wxListBox::SetString
 671
 672 int wxListBox::GetCount() const
 673 {
 674     return m_nNumItems;
 675 }
 676
 677 // ----------------------------------------------------------------------------
 678 // helpers
 679 // ----------------------------------------------------------------------------
 680
 681 wxSize wxListBox::DoGetBestSize() const
 682 {
 683     //
 684     // Find the widest string
 685     //
 686     int                             nLine;
 687     int                             nListbox = 0;
 688     int                             nCx;
 689     int                             nCy;
 690
 691     for (int i = 0; i < m_nNumItems; i++)
 692     {
 693         wxString                    vStr(GetString(i));
 694
 695         GetTextExtent( vStr
 696                       ,&nLine
 697                       ,NULL
 698                      );
 699         if (nLine > nListbox)
 700             nListbox = nLine;
 701     }
 702
 703     //
 704     // Give it some reasonable default value if there are no strings in the
 705     // list.
 706     //
 707     if (nListbox == 0)
 708         nListbox = 100;
 709
 710     //
 711     // The listbox should be slightly larger than the widest string
 712     //
 713     wxGetCharSize( GetHWND()
 714                   ,&nCx
 715                   ,&nCy
 716                   ,(wxFont*)&GetFont()
 717                  );
 718     nListbox += 3 * nCx;
 719
 720     int                             hListbox = EDIT_HEIGHT_FROM_CHAR_HEIGHT(nCy) * (wxMax(m_nNumItems, 7));
 721
 722     return wxSize( nListbox
 723                   ,hListbox
 724                  );
 725 } // end of wxListBox::DoGetBestSize
 726
 727 // ----------------------------------------------------------------------------
 728 // callbacks
 729 // ----------------------------------------------------------------------------
 730
 731 bool wxListBox::OS2Command(
 732   WXUINT                            uParam
 733 , WXWORD                            WXUNUSED(wId))
 734 {
 735     wxEventType                     eEvtType;
 736
 737     if (uParam == LN_SELECT)
 738     {
 739         eEvtType = wxEVT_COMMAND_LISTBOX_SELECTED;
 740     }
 741     if (uParam == LN_ENTER)
 742     {
 743         eEvtType = wxEVT_COMMAND_LISTBOX_DOUBLECLICKED;
 744     }
 745     else
 746     {
 747         //
 748         // Some event we're not interested in
 749         //
 750         return FALSE;
 751     }
 752     wxCommandEvent                  vEvent( eEvtType
 753                                            ,m_windowId
 754                                           );
 755
 756     vEvent.SetEventObject(this);
 757
 758     wxArrayInt                      aSelections;
 759     int                             n;
 760     int                             nCount = GetSelections(aSelections);
 761
 762     if (nCount > 0)
 763     {
 764         n = aSelections[0];
 765         if (HasClientObjectData())
 766             vEvent.SetClientObject(GetClientObject(n));
 767         else if ( HasClientUntypedData() )
 768             vEvent.SetClientData(GetClientData(n));
 769         vEvent.SetString(GetString(n));
 770     }
 771     else
 772     {
 773         n = -1;
 774     }
 775     vEvent.m_commandInt = n;
 776     return GetEventHandler()->ProcessEvent(vEvent);
 777 } // end of wxListBox::OS2Command
 778
 779 // ----------------------------------------------------------------------------
 780 // wxCheckListBox support
 781 // ----------------------------------------------------------------------------
 782
 783 #if wxUSE_OWNER_DRAWN
 784
 785 //
 786 // Drawing
 787 // -------
 788 //
 789 #define OWNER_DRAWN_LISTBOX_EXTRA_SPACE    (1)
 790
 791 bool wxListBox::OS2OnMeasure(WXMEASUREITEMSTRUCT *item)
 792 {
 793     //
 794     // TODO: Get to this eventually
 795     //
 796     return TRUE;
 797 }
 798
 799 bool wxListBox::OS2OnDraw(WXDRAWITEMSTRUCT *item)
 800 {
 801     //
 802     // TODO: Get to this eventually
 803     //
 804     return FALSE;
 805 }
 806 #endif // ndef for wxUSE_OWNER_DRAWN
 807
 808 #endif // ndef for wxUSE_LISTBOX
 809