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 licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  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 #include "wx/dynarray.h"
  40 #include "wx/log.h"
  41
  42 #if wxUSE_OWNER_DRAWN
  43     #include  "wx/ownerdrw.h"
  44 #endif
  45
  46 #ifdef __GNUWIN32_OLD__
  47     #include "wx/msw/gnuwin32/extra.h"
  48 #endif
  49
  50 #if wxUSE_EXTENDED_RTTI
  51 WX_DEFINE_FLAGS( wxListBoxStyle )
  52
  53 wxBEGIN_FLAGS( wxListBoxStyle )
  54     // new style border flags, we put them first to
  55     // use them for streaming out
  56     wxFLAGS_MEMBER(wxBORDER_SIMPLE)
  57     wxFLAGS_MEMBER(wxBORDER_SUNKEN)
  58     wxFLAGS_MEMBER(wxBORDER_DOUBLE)
  59     wxFLAGS_MEMBER(wxBORDER_RAISED)
  60     wxFLAGS_MEMBER(wxBORDER_STATIC)
  61     wxFLAGS_MEMBER(wxBORDER_NONE)
  62
  63     // old style border flags
  64     wxFLAGS_MEMBER(wxSIMPLE_BORDER)
  65     wxFLAGS_MEMBER(wxSUNKEN_BORDER)
  66     wxFLAGS_MEMBER(wxDOUBLE_BORDER)
  67     wxFLAGS_MEMBER(wxRAISED_BORDER)
  68     wxFLAGS_MEMBER(wxSTATIC_BORDER)
  69     wxFLAGS_MEMBER(wxBORDER)
  70
  71     // standard window styles
  72     wxFLAGS_MEMBER(wxTAB_TRAVERSAL)
  73     wxFLAGS_MEMBER(wxCLIP_CHILDREN)
  74     wxFLAGS_MEMBER(wxTRANSPARENT_WINDOW)
  75     wxFLAGS_MEMBER(wxWANTS_CHARS)
  76     wxFLAGS_MEMBER(wxFULL_REPAINT_ON_RESIZE)
  77     wxFLAGS_MEMBER(wxALWAYS_SHOW_SB )
  78     wxFLAGS_MEMBER(wxVSCROLL)
  79     wxFLAGS_MEMBER(wxHSCROLL)
  80
  81     wxFLAGS_MEMBER(wxLB_SINGLE)
  82     wxFLAGS_MEMBER(wxLB_MULTIPLE)
  83     wxFLAGS_MEMBER(wxLB_EXTENDED)
  84     wxFLAGS_MEMBER(wxLB_HSCROLL)
  85     wxFLAGS_MEMBER(wxLB_ALWAYS_SB)
  86     wxFLAGS_MEMBER(wxLB_NEEDED_SB)
  87     wxFLAGS_MEMBER(wxLB_SORT)
  88
  89 wxEND_FLAGS( wxListBoxStyle )
  90
  91 IMPLEMENT_DYNAMIC_CLASS_XTI(wxListBox, wxControl,"wx/listbox.h")
  92
  93 wxBEGIN_PROPERTIES_TABLE(wxListBox)
  94         wxEVENT_PROPERTY( Select , wxEVT_COMMAND_LISTBOX_SELECTED , wxCommandEvent )
  95         wxEVENT_PROPERTY( DoubleClick , wxEVT_COMMAND_LISTBOX_DOUBLECLICKED , wxCommandEvent )
  96
  97     wxPROPERTY( Font , wxFont , SetFont , GetFont  , EMPTY_MACROVALUE, 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
  98     wxPROPERTY_COLLECTION( Choices , wxArrayString , wxString , AppendString , GetStrings, 0 /*flags*/ , wxT("Helpstring") , wxT("group") )
  99         wxPROPERTY( Selection ,int, SetSelection, GetSelection, EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group") )
 100     wxPROPERTY_FLAGS( WindowStyle , wxListBoxStyle , long , SetWindowStyleFlag , GetWindowStyleFlag , EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group")) // style
 101 wxEND_PROPERTIES_TABLE()
 102
 103 wxBEGIN_HANDLERS_TABLE(wxListBox)
 104 wxEND_HANDLERS_TABLE()
 105
 106 wxCONSTRUCTOR_4( wxListBox , wxWindow* , Parent , wxWindowID , Id , wxPoint , Position , wxSize , Size )
 107 #else
 108 IMPLEMENT_DYNAMIC_CLASS(wxListBox, wxControl)
 109 #endif
 110
 111 /*
 112 TODO PROPERTIES
 113         selection
 114         content
 115                 item
 116 */
 117
 118 // ============================================================================
 119 // list box item declaration and implementation
 120 // ============================================================================
 121
 122 #if wxUSE_OWNER_DRAWN
 123
 124 class wxListBoxItem : public wxOwnerDrawn
 125 {
 126 public:
 127     wxListBoxItem(const wxString& str = wxEmptyString);
 128 };
 129
 130 wxListBoxItem::wxListBoxItem(const wxString& str) : wxOwnerDrawn(str, FALSE)
 131 {
 132     // no bitmaps/checkmarks
 133     SetMarginWidth(0);
 134 }
 135
 136 wxOwnerDrawn *wxListBox::CreateLboxItem(size_t WXUNUSED(n))
 137 {
 138     return new wxListBoxItem();
 139 }
 140
 141 #endif  //USE_OWNER_DRAWN
 142
 143 // ============================================================================
 144 // list box control implementation
 145 // ============================================================================
 146
 147 // ----------------------------------------------------------------------------
 148 // creation
 149 // ----------------------------------------------------------------------------
 150
 151 // Listbox item
 152 wxListBox::wxListBox()
 153 {
 154     m_noItems = 0;
 155     m_selected = 0;
 156 }
 157
 158 bool wxListBox::Create(wxWindow *parent,
 159                        wxWindowID id,
 160                        const wxPoint& pos,
 161                        const wxSize& size,
 162                        int n, const wxString choices[],
 163                        long style,
 164                        const wxValidator& validator,
 165                        const wxString& name)
 166 {
 167     m_noItems = 0;
 168     m_selected = 0;
 169
 170     // initialize base class fields
 171     if ( !CreateControl(parent, id, pos, size, style, validator, name) )
 172         return false;
 173
 174     // create the native control
 175     if ( !MSWCreateControl(_T("LISTBOX"), wxEmptyString, pos, size) )
 176     {
 177         // control creation failed
 178         return false;
 179     }
 180
 181     // initialize the contents
 182     for ( int i = 0; i < n; i++ )
 183     {
 184         Append(choices[i]);
 185     }
 186
 187     return true;
 188 }
 189
 190 bool wxListBox::Create(wxWindow *parent,
 191                        wxWindowID id,
 192                        const wxPoint& pos,
 193                        const wxSize& size,
 194                        const wxArrayString& choices,
 195                        long style,
 196                        const wxValidator& validator,
 197                        const wxString& name)
 198 {
 199     wxCArrayString chs(choices);
 200     return Create(parent, id, pos, size, chs.GetCount(), chs.GetStrings(),
 201                   style, validator, name);
 202 }
 203
 204 wxListBox::~wxListBox()
 205 {
 206     Free();
 207 }
 208
 209 WXDWORD wxListBox::MSWGetStyle(long style, WXDWORD *exstyle) const
 210 {
 211     WXDWORD msStyle = wxControl::MSWGetStyle(style, exstyle);
 212
 213     // always show the vertical scrollbar if necessary -- otherwise it is
 214     // impossible to use the control with the mouse
 215     msStyle |= WS_VSCROLL;
 216
 217     // we always want to get the notifications
 218     msStyle |= LBS_NOTIFY;
 219
 220     // without this style, you get unexpected heights, so e.g. constraint
 221     // layout doesn't work properly
 222     msStyle |= LBS_NOINTEGRALHEIGHT;
 223
 224     wxASSERT_MSG( !(style & wxLB_MULTIPLE) || !(style & wxLB_EXTENDED),
 225                   _T("only one of listbox selection modes can be specified") );
 226
 227     if ( style & wxLB_MULTIPLE )
 228         msStyle |= LBS_MULTIPLESEL;
 229     else if ( style & wxLB_EXTENDED )
 230         msStyle |= LBS_EXTENDEDSEL;
 231
 232     if ( m_windowStyle & wxLB_ALWAYS_SB )
 233         msStyle |= LBS_DISABLENOSCROLL;
 234     if ( m_windowStyle & wxLB_HSCROLL )
 235         msStyle |= WS_HSCROLL;
 236     if ( m_windowStyle & wxLB_SORT )
 237         msStyle |= LBS_SORT;
 238
 239 #if wxUSE_OWNER_DRAWN && !defined(__WXWINCE__)
 240     if ( m_windowStyle & wxLB_OWNERDRAW )
 241     {
 242         // we don't support LBS_OWNERDRAWVARIABLE yet and we also always put
 243         // the strings in the listbox for simplicity even though we could have
 244         // avoided it in this case
 245         msStyle |= LBS_OWNERDRAWFIXED | LBS_HASSTRINGS;
 246     }
 247 #endif // wxUSE_OWNER_DRAWN
 248
 249     return msStyle;
 250 }
 251
 252 // ----------------------------------------------------------------------------
 253 // implementation of wxListBoxBase methods
 254 // ----------------------------------------------------------------------------
 255
 256 void wxListBox::DoSetFirstItem(int N)
 257 {
 258     wxCHECK_RET( N >= 0 && N < m_noItems,
 259                  wxT("invalid index in wxListBox::SetFirstItem") );
 260
 261     SendMessage(GetHwnd(), LB_SETTOPINDEX, (WPARAM)N, (LPARAM)0);
 262 }
 263
 264 void wxListBox::Delete(int N)
 265 {
 266     wxCHECK_RET( N >= 0 && N < m_noItems,
 267                  wxT("invalid index in wxListBox::Delete") );
 268
 269     // for owner drawn objects, the data is used for storing wxOwnerDrawn
 270     // pointers and we shouldn't touch it
 271 #if !wxUSE_OWNER_DRAWN
 272     if ( !(m_windowStyle & wxLB_OWNERDRAW) )
 273 #endif // !wxUSE_OWNER_DRAWN
 274         if ( HasClientObjectData() )
 275         {
 276             delete GetClientObject(N);
 277         }
 278
 279     SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);
 280     m_noItems--;
 281
 282     SetHorizontalExtent(wxEmptyString);
 283 }
 284
 285 int wxListBox::DoAppend(const wxString& item)
 286 {
 287     int index = ListBox_AddString(GetHwnd(), item);
 288     m_noItems++;
 289
 290 #if wxUSE_OWNER_DRAWN
 291     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 292         wxOwnerDrawn *pNewItem = CreateLboxItem(index); // dummy argument
 293         pNewItem->SetName(item);
 294         m_aItems.Insert(pNewItem, index);
 295         ListBox_SetItemData(GetHwnd(), index, pNewItem);
 296         pNewItem->SetFont(GetFont());
 297     }
 298 #endif // wxUSE_OWNER_DRAWN
 299
 300     SetHorizontalExtent(item);
 301
 302     return index;
 303 }
 304
 305 void wxListBox::DoSetItems(const wxArrayString& choices, void** clientData)
 306 {
 307     // avoid flicker - but don't need to do this for a hidden listbox
 308     bool hideAndShow = IsShown();
 309     if ( hideAndShow )
 310     {
 311         ShowWindow(GetHwnd(), SW_HIDE);
 312     }
 313
 314     ListBox_ResetContent(GetHwnd());
 315
 316     m_noItems = choices.GetCount();
 317     int i;
 318     for (i = 0; i < m_noItems; i++)
 319     {
 320         ListBox_AddString(GetHwnd(), choices[i]);
 321         if ( clientData )
 322         {
 323             SetClientData(i, clientData[i]);
 324         }
 325     }
 326
 327 #if wxUSE_OWNER_DRAWN
 328     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 329         // first delete old items
 330         WX_CLEAR_ARRAY(m_aItems);
 331
 332         // then create new ones
 333         for ( size_t ui = 0; ui < (size_t)m_noItems; ui++ ) {
 334             wxOwnerDrawn *pNewItem = CreateLboxItem(ui);
 335             pNewItem->SetName(choices[ui]);
 336             m_aItems.Add(pNewItem);
 337             ListBox_SetItemData(GetHwnd(), ui, pNewItem);
 338         }
 339     }
 340 #endif // wxUSE_OWNER_DRAWN
 341
 342     SetHorizontalExtent();
 343
 344     if ( hideAndShow )
 345     {
 346         // show the listbox back if we hid it
 347         ShowWindow(GetHwnd(), SW_SHOW);
 348     }
 349 }
 350
 351 int wxListBox::FindString(const wxString& s) const
 352 {
 353     int pos = ListBox_FindStringExact(GetHwnd(), (WPARAM)-1, s);
 354     if (pos == LB_ERR)
 355         return wxNOT_FOUND;
 356     else
 357         return pos;
 358 }
 359
 360 void wxListBox::Clear()
 361 {
 362     Free();
 363
 364     ListBox_ResetContent(GetHwnd());
 365
 366     m_noItems = 0;
 367     SetHorizontalExtent();
 368 }
 369
 370 void wxListBox::Free()
 371 {
 372 #if wxUSE_OWNER_DRAWN
 373     if ( m_windowStyle & wxLB_OWNERDRAW )
 374     {
 375         WX_CLEAR_ARRAY(m_aItems);
 376     }
 377     else
 378 #endif // wxUSE_OWNER_DRAWN
 379     if ( HasClientObjectData() )
 380     {
 381         for ( size_t n = 0; n < (size_t)m_noItems; n++ )
 382         {
 383             delete GetClientObject(n);
 384         }
 385     }
 386 }
 387
 388 void wxListBox::SetSelection(int N, bool select)
 389 {
 390     wxCHECK_RET( N == wxNOT_FOUND ||
 391                     (N >= 0 && N < m_noItems),
 392                  wxT("invalid index in wxListBox::SetSelection") );
 393
 394     if ( HasMultipleSelection() )
 395     {
 396         SendMessage(GetHwnd(), LB_SETSEL, select, N);
 397     }
 398     else
 399     {
 400         SendMessage(GetHwnd(), LB_SETCURSEL, select ? N : -1, 0);
 401     }
 402 }
 403
 404 bool wxListBox::IsSelected(int N) const
 405 {
 406     wxCHECK_MSG( N >= 0 && N < m_noItems, FALSE,
 407                  wxT("invalid index in wxListBox::Selected") );
 408
 409     return SendMessage(GetHwnd(), LB_GETSEL, N, 0) == 0 ? FALSE : TRUE;
 410 }
 411
 412 wxClientData* wxListBox::DoGetItemClientObject(int n) const
 413 {
 414     return (wxClientData *)DoGetItemClientData(n);
 415 }
 416
 417 void *wxListBox::DoGetItemClientData(int n) const
 418 {
 419     wxCHECK_MSG( n >= 0 && n < m_noItems, NULL,
 420                  wxT("invalid index in wxListBox::GetClientData") );
 421
 422     return (void *)SendMessage(GetHwnd(), LB_GETITEMDATA, n, 0);
 423 }
 424
 425 void wxListBox::DoSetItemClientObject(int n, wxClientData* clientData)
 426 {
 427     DoSetItemClientData(n, clientData);
 428 }
 429
 430 void wxListBox::DoSetItemClientData(int n, void *clientData)
 431 {
 432     wxCHECK_RET( n >= 0 && n < m_noItems,
 433                  wxT("invalid index in wxListBox::SetClientData") );
 434
 435 #if wxUSE_OWNER_DRAWN
 436     if ( m_windowStyle & wxLB_OWNERDRAW )
 437     {
 438         // client data must be pointer to wxOwnerDrawn, otherwise we would crash
 439         // in OnMeasure/OnDraw.
 440         wxFAIL_MSG(wxT("Can't use client data with owner-drawn listboxes"));
 441     }
 442 #endif // wxUSE_OWNER_DRAWN
 443
 444     if ( ListBox_SetItemData(GetHwnd(), n, clientData) == LB_ERR )
 445         wxLogDebug(wxT("LB_SETITEMDATA failed"));
 446 }
 447
 448 // Return number of selections and an array of selected integers
 449 int wxListBox::GetSelections(wxArrayInt& aSelections) const
 450 {
 451     aSelections.Empty();
 452
 453     if ( HasMultipleSelection() )
 454     {
 455         int countSel = ListBox_GetSelCount(GetHwnd());
 456         if ( countSel == LB_ERR )
 457         {
 458             wxLogDebug(_T("ListBox_GetSelCount failed"));
 459         }
 460         else if ( countSel != 0 )
 461         {
 462             int *selections = new int[countSel];
 463
 464             if ( ListBox_GetSelItems(GetHwnd(),
 465                                      countSel, selections) == LB_ERR )
 466             {
 467                 wxLogDebug(wxT("ListBox_GetSelItems failed"));
 468                 countSel = -1;
 469             }
 470             else
 471             {
 472                 aSelections.Alloc(countSel);
 473                 for ( int n = 0; n < countSel; n++ )
 474                     aSelections.Add(selections[n]);
 475             }
 476
 477             delete [] selections;
 478         }
 479
 480         return countSel;
 481     }
 482     else  // single-selection listbox
 483     {
 484         if (ListBox_GetCurSel(GetHwnd()) > -1)
 485             aSelections.Add(ListBox_GetCurSel(GetHwnd()));
 486
 487         return aSelections.Count();
 488     }
 489 }
 490
 491 // Get single selection, for single choice list items
 492 int wxListBox::GetSelection() const
 493 {
 494     wxCHECK_MSG( !HasMultipleSelection(),
 495                  -1,
 496                  wxT("GetSelection() can't be used with multiple-selection listboxes, use GetSelections() instead.") );
 497
 498     return ListBox_GetCurSel(GetHwnd());
 499 }
 500
 501 // Find string for position
 502 wxString wxListBox::GetString(int N) const
 503 {
 504     wxCHECK_MSG( N >= 0 && N < m_noItems, wxEmptyString,
 505                  wxT("invalid index in wxListBox::GetClientData") );
 506
 507     int len = ListBox_GetTextLen(GetHwnd(), N);
 508
 509     // +1 for terminating NUL
 510     wxString result;
 511     ListBox_GetText(GetHwnd(), N, wxStringBuffer(result, len + 1));
 512
 513     return result;
 514 }
 515
 516 void
 517 wxListBox::DoInsertItems(const wxArrayString& items, int pos)
 518 {
 519     wxCHECK_RET( pos >= 0 && pos <= m_noItems,
 520                  wxT("invalid index in wxListBox::InsertItems") );
 521
 522     int nItems = items.GetCount();
 523     for ( int i = 0; i < nItems; i++ )
 524     {
 525         int idx = ListBox_InsertString(GetHwnd(), i + pos, items[i]);
 526
 527 #if wxUSE_OWNER_DRAWN
 528         if ( m_windowStyle & wxLB_OWNERDRAW )
 529         {
 530             wxOwnerDrawn *pNewItem = CreateLboxItem(idx);
 531             pNewItem->SetName(items[i]);
 532             pNewItem->SetFont(GetFont());
 533             m_aItems.Insert(pNewItem, idx);
 534
 535             ListBox_SetItemData(GetHwnd(), idx, pNewItem);
 536         }
 537 #endif // wxUSE_OWNER_DRAWN
 538     }
 539
 540     m_noItems += nItems;
 541
 542     SetHorizontalExtent();
 543 }
 544
 545 void wxListBox::SetString(int N, const wxString& s)
 546 {
 547     wxCHECK_RET( N >= 0 && N < m_noItems,
 548                  wxT("invalid index in wxListBox::SetString") );
 549
 550     // remember the state of the item
 551     bool wasSelected = IsSelected(N);
 552
 553     void *oldData = NULL;
 554     wxClientData *oldObjData = NULL;
 555     if ( m_clientDataItemsType == wxClientData_Void )
 556         oldData = GetClientData(N);
 557     else if ( m_clientDataItemsType == wxClientData_Object )
 558         oldObjData = GetClientObject(N);
 559
 560     // delete and recreate it
 561     SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);
 562
 563     int newN = N;
 564     if ( N == m_noItems - 1 )
 565         newN = -1;
 566
 567     ListBox_InsertString(GetHwnd(), newN, s);
 568
 569     // restore the client data
 570     if ( oldData )
 571         SetClientData(N, oldData);
 572     else if ( oldObjData )
 573         SetClientObject(N, oldObjData);
 574
 575 #if wxUSE_OWNER_DRAWN
 576     if ( m_windowStyle & wxLB_OWNERDRAW )
 577     {
 578         // update item's text
 579         m_aItems[N]->SetName(s);
 580
 581         // reassign the item's data
 582         ListBox_SetItemData(GetHwnd(), N, m_aItems[N]);
 583     }
 584 #endif  //USE_OWNER_DRAWN
 585
 586     // we may have lost the selection
 587     if ( wasSelected )
 588         Select(N);
 589 }
 590
 591 int wxListBox::GetCount() const
 592 {
 593     return m_noItems;
 594 }
 595
 596 // ----------------------------------------------------------------------------
 597 // helpers
 598 // ----------------------------------------------------------------------------
 599
 600 // Windows-specific code to set the horizontal extent of the listbox, if
 601 // necessary. If s is non-NULL, it's used to calculate the horizontal extent.
 602 // Otherwise, all strings are used.
 603 void wxListBox::SetHorizontalExtent(const wxString& s)
 604 {
 605     // Only necessary if we want a horizontal scrollbar
 606     if (!(m_windowStyle & wxHSCROLL))
 607         return;
 608     TEXTMETRIC lpTextMetric;
 609
 610     if ( !s.IsEmpty() )
 611     {
 612         int existingExtent = (int)SendMessage(GetHwnd(), LB_GETHORIZONTALEXTENT, 0, 0L);
 613         HDC dc = GetWindowDC(GetHwnd());
 614         HFONT oldFont = 0;
 615         if (GetFont().Ok() && GetFont().GetResourceHandle())
 616             oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
 617
 618         GetTextMetrics(dc, &lpTextMetric);
 619         SIZE extentXY;
 620         ::GetTextExtentPoint(dc, (LPTSTR) (const wxChar *)s, s.Length(), &extentXY);
 621         int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 622
 623         if (oldFont)
 624             ::SelectObject(dc, oldFont);
 625
 626         ReleaseDC(GetHwnd(), dc);
 627         if (extentX > existingExtent)
 628             SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(extentX), 0L);
 629     }
 630     else
 631     {
 632         int largestExtent = 0;
 633         HDC dc = GetWindowDC(GetHwnd());
 634         HFONT oldFont = 0;
 635         if (GetFont().Ok() && GetFont().GetResourceHandle())
 636             oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
 637
 638         GetTextMetrics(dc, &lpTextMetric);
 639
 640         // FIXME: buffer overflow!!
 641         wxChar buf[1024];
 642         for (int i = 0; i < m_noItems; i++)
 643         {
 644             int len = (int)SendMessage(GetHwnd(), LB_GETTEXT, i, (LPARAM)buf);
 645             buf[len] = 0;
 646             SIZE extentXY;
 647             ::GetTextExtentPoint(dc, buf, len, &extentXY);
 648             int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 649             if (extentX > largestExtent)
 650                 largestExtent = extentX;
 651         }
 652         if (oldFont)
 653             ::SelectObject(dc, oldFont);
 654
 655         ReleaseDC(GetHwnd(), dc);
 656         SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(largestExtent), 0L);
 657     }
 658 }
 659
 660 wxSize wxListBox::DoGetBestSize() const
 661 {
 662     // find the widest string
 663     int wLine;
 664     int wListbox = 0;
 665     for ( int i = 0; i < m_noItems; i++ )
 666     {
 667         wxString str(GetString(i));
 668         GetTextExtent(str, &wLine, NULL);
 669         if ( wLine > wListbox )
 670             wListbox = wLine;
 671     }
 672
 673     // give it some reasonable default value if there are no strings in the
 674     // list
 675     if ( wListbox == 0 )
 676         wListbox = 100;
 677
 678     // the listbox should be slightly larger than the widest string
 679     int cx, cy;
 680     wxGetCharSize(GetHWND(), &cx, &cy, &GetFont());
 681
 682     wListbox += 3*cx;
 683
 684     // don't make the listbox too tall (limit height to 10 items) but don't
 685     // make it too small neither
 686     int hListbox = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy)*
 687                     wxMin(wxMax(m_noItems, 3), 10);
 688
 689     return wxSize(wListbox, hListbox);
 690 }
 691
 692 // ----------------------------------------------------------------------------
 693 // callbacks
 694 // ----------------------------------------------------------------------------
 695
 696 bool wxListBox::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 697 {
 698     wxEventType evtType;
 699     if ( param == LBN_SELCHANGE )
 700     {
 701         evtType = wxEVT_COMMAND_LISTBOX_SELECTED;
 702     }
 703     else if ( param == LBN_DBLCLK )
 704     {
 705         evtType = wxEVT_COMMAND_LISTBOX_DOUBLECLICKED;
 706     }
 707     else
 708     {
 709         // some event we're not interested in
 710         return FALSE;
 711     }
 712
 713     wxCommandEvent event(evtType, m_windowId);
 714     event.SetEventObject( this );
 715
 716     // retrieve the affected item
 717     int n = SendMessage(GetHwnd(), LB_GETCARETINDEX, 0, 0);
 718     if ( n != LB_ERR )
 719     {
 720         if ( HasClientObjectData() )
 721             event.SetClientObject( GetClientObject(n) );
 722         else if ( HasClientUntypedData() )
 723             event.SetClientData( GetClientData(n) );
 724
 725         event.SetString( GetString(n) );
 726         event.SetExtraLong( HasMultipleSelection() ? IsSelected(n) : TRUE );
 727     }
 728
 729     event.m_commandInt = n;
 730
 731     return GetEventHandler()->ProcessEvent(event);
 732 }
 733
 734 // ----------------------------------------------------------------------------
 735 // wxCheckListBox support
 736 // ----------------------------------------------------------------------------
 737
 738 #if wxUSE_OWNER_DRAWN
 739
 740 // drawing
 741 // -------
 742
 743 // space beneath/above each row in pixels
 744 // "standard" checklistbox use 1 here, some might prefer 2. 0 is ugly.
 745 #define OWNER_DRAWN_LISTBOX_EXTRA_SPACE    (1)
 746
 747 // the height is the same for all items
 748 // TODO should be changed for LBS_OWNERDRAWVARIABLE style listboxes
 749
 750 // NB: can't forward this to wxListBoxItem because LB_SETITEMDATA
 751 //     message is not yet sent when we get here!
 752 bool wxListBox::MSWOnMeasure(WXMEASUREITEMSTRUCT *item)
 753 {
 754     // only owner-drawn control should receive this message
 755     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), FALSE );
 756
 757     MEASUREITEMSTRUCT *pStruct = (MEASUREITEMSTRUCT *)item;
 758
 759 #ifdef __WXWINCE__
 760     HDC hdc = GetDC(NULL);
 761 #else
 762     HDC hdc = CreateIC(wxT("DISPLAY"), NULL, NULL, 0);
 763 #endif
 764
 765     wxDC dc;
 766     dc.SetHDC((WXHDC)hdc);
 767     dc.SetFont(wxSystemSettings::GetFont(wxSYS_ANSI_VAR_FONT));
 768
 769     pStruct->itemHeight = dc.GetCharHeight() + 2*OWNER_DRAWN_LISTBOX_EXTRA_SPACE;
 770     pStruct->itemWidth  = dc.GetCharWidth();
 771
 772     dc.SetHDC(0);
 773
 774     DeleteDC(hdc);
 775
 776     return TRUE;
 777 }
 778
 779 // forward the message to the appropriate item
 780 bool wxListBox::MSWOnDraw(WXDRAWITEMSTRUCT *item)
 781 {
 782     // only owner-drawn control should receive this message
 783     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), FALSE );
 784
 785     DRAWITEMSTRUCT *pStruct = (DRAWITEMSTRUCT *)item;
 786     UINT itemID = pStruct->itemID;
 787
 788     // the item may be -1 for an empty listbox
 789     if ( itemID == (UINT)-1 )
 790         return FALSE;
 791
 792     long data = ListBox_GetItemData(GetHwnd(), pStruct->itemID);
 793
 794     wxCHECK( data && (data != LB_ERR), FALSE );
 795
 796     wxListBoxItem *pItem = (wxListBoxItem *)data;
 797
 798     wxDCTemp dc((WXHDC)pStruct->hDC);
 799     wxRect rect(wxPoint(pStruct->rcItem.left, pStruct->rcItem.top),
 800                 wxPoint(pStruct->rcItem.right, pStruct->rcItem.bottom));
 801
 802     return pItem->OnDrawItem(dc, rect,
 803                              (wxOwnerDrawn::wxODAction)pStruct->itemAction,
 804                              (wxOwnerDrawn::wxODStatus)pStruct->itemState);
 805 }
 806
 807 #endif // wxUSE_OWNER_DRAWN
 808
 809 #endif // wxUSE_LISTBOX