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     // now we can compute our best size correctly, so do it if necessary
 188     SetBestSize(size);
 189
 190     return true;
 191 }
 192
 193 bool wxListBox::Create(wxWindow *parent,
 194                        wxWindowID id,
 195                        const wxPoint& pos,
 196                        const wxSize& size,
 197                        const wxArrayString& choices,
 198                        long style,
 199                        const wxValidator& validator,
 200                        const wxString& name)
 201 {
 202     wxCArrayString chs(choices);
 203     return Create(parent, id, pos, size, chs.GetCount(), chs.GetStrings(),
 204                   style, validator, name);
 205 }
 206
 207 wxListBox::~wxListBox()
 208 {
 209     Free();
 210 }
 211
 212 WXDWORD wxListBox::MSWGetStyle(long style, WXDWORD *exstyle) const
 213 {
 214     WXDWORD msStyle = wxControl::MSWGetStyle(style, exstyle);
 215
 216     // always show the vertical scrollbar if necessary -- otherwise it is
 217     // impossible to use the control with the mouse
 218     msStyle |= WS_VSCROLL;
 219
 220     // we always want to get the notifications
 221     msStyle |= LBS_NOTIFY;
 222
 223     // without this style, you get unexpected heights, so e.g. constraint
 224     // layout doesn't work properly
 225     msStyle |= LBS_NOINTEGRALHEIGHT;
 226
 227     wxASSERT_MSG( !(style & wxLB_MULTIPLE) || !(style & wxLB_EXTENDED),
 228                   _T("only one of listbox selection modes can be specified") );
 229
 230     if ( style & wxLB_MULTIPLE )
 231         msStyle |= LBS_MULTIPLESEL;
 232     else if ( style & wxLB_EXTENDED )
 233         msStyle |= LBS_EXTENDEDSEL;
 234
 235     if ( m_windowStyle & wxLB_ALWAYS_SB )
 236         msStyle |= LBS_DISABLENOSCROLL;
 237     if ( m_windowStyle & wxLB_HSCROLL )
 238         msStyle |= WS_HSCROLL;
 239     if ( m_windowStyle & wxLB_SORT )
 240         msStyle |= LBS_SORT;
 241
 242 #if wxUSE_OWNER_DRAWN && !defined(__WXWINCE__)
 243     if ( m_windowStyle & wxLB_OWNERDRAW )
 244     {
 245         // we don't support LBS_OWNERDRAWVARIABLE yet and we also always put
 246         // the strings in the listbox for simplicity even though we could have
 247         // avoided it in this case
 248         msStyle |= LBS_OWNERDRAWFIXED | LBS_HASSTRINGS;
 249     }
 250 #endif // wxUSE_OWNER_DRAWN
 251
 252     return msStyle;
 253 }
 254
 255 // ----------------------------------------------------------------------------
 256 // implementation of wxListBoxBase methods
 257 // ----------------------------------------------------------------------------
 258
 259 void wxListBox::DoSetFirstItem(int N)
 260 {
 261     wxCHECK_RET( N >= 0 && N < m_noItems,
 262                  wxT("invalid index in wxListBox::SetFirstItem") );
 263
 264     SendMessage(GetHwnd(), LB_SETTOPINDEX, (WPARAM)N, (LPARAM)0);
 265 }
 266
 267 void wxListBox::Delete(int N)
 268 {
 269     wxCHECK_RET( N >= 0 && N < m_noItems,
 270                  wxT("invalid index in wxListBox::Delete") );
 271
 272     // for owner drawn objects, the data is used for storing wxOwnerDrawn
 273     // pointers and we shouldn't touch it
 274 #if !wxUSE_OWNER_DRAWN
 275     if ( !(m_windowStyle & wxLB_OWNERDRAW) )
 276 #endif // !wxUSE_OWNER_DRAWN
 277         if ( HasClientObjectData() )
 278         {
 279             delete GetClientObject(N);
 280         }
 281
 282     SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);
 283     m_noItems--;
 284
 285     SetHorizontalExtent(wxEmptyString);
 286 }
 287
 288 int wxListBox::DoAppend(const wxString& item)
 289 {
 290     InvalidateBestSize();
 291
 292     int index = ListBox_AddString(GetHwnd(), item);
 293     m_noItems++;
 294
 295 #if wxUSE_OWNER_DRAWN
 296     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 297         wxOwnerDrawn *pNewItem = CreateLboxItem(index); // dummy argument
 298         pNewItem->SetName(item);
 299         m_aItems.Insert(pNewItem, index);
 300         ListBox_SetItemData(GetHwnd(), index, pNewItem);
 301         pNewItem->SetFont(GetFont());
 302     }
 303 #endif // wxUSE_OWNER_DRAWN
 304
 305     SetHorizontalExtent(item);
 306
 307     return index;
 308 }
 309
 310 void wxListBox::DoSetItems(const wxArrayString& choices, void** clientData)
 311 {
 312     // avoid flicker - but don't need to do this for a hidden listbox
 313     bool hideAndShow = IsShown();
 314     if ( hideAndShow )
 315     {
 316         ShowWindow(GetHwnd(), SW_HIDE);
 317     }
 318
 319     ListBox_ResetContent(GetHwnd());
 320
 321     m_noItems = choices.GetCount();
 322     int i;
 323     for (i = 0; i < m_noItems; i++)
 324     {
 325         ListBox_AddString(GetHwnd(), choices[i]);
 326         if ( clientData )
 327         {
 328             SetClientData(i, clientData[i]);
 329         }
 330     }
 331
 332 #if wxUSE_OWNER_DRAWN
 333     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 334         // first delete old items
 335         WX_CLEAR_ARRAY(m_aItems);
 336
 337         // then create new ones
 338         for ( size_t ui = 0; ui < (size_t)m_noItems; ui++ ) {
 339             wxOwnerDrawn *pNewItem = CreateLboxItem(ui);
 340             pNewItem->SetName(choices[ui]);
 341             m_aItems.Add(pNewItem);
 342             ListBox_SetItemData(GetHwnd(), ui, pNewItem);
 343         }
 344     }
 345 #endif // wxUSE_OWNER_DRAWN
 346
 347     SetHorizontalExtent();
 348
 349     if ( hideAndShow )
 350     {
 351         // show the listbox back if we hid it
 352         ShowWindow(GetHwnd(), SW_SHOW);
 353     }
 354 }
 355
 356 int wxListBox::FindString(const wxString& s) const
 357 {
 358     int pos = ListBox_FindStringExact(GetHwnd(), (WPARAM)-1, s);
 359     if (pos == LB_ERR)
 360         return wxNOT_FOUND;
 361     else
 362         return pos;
 363 }
 364
 365 void wxListBox::Clear()
 366 {
 367     Free();
 368
 369     ListBox_ResetContent(GetHwnd());
 370
 371     m_noItems = 0;
 372     SetHorizontalExtent();
 373 }
 374
 375 void wxListBox::Free()
 376 {
 377 #if wxUSE_OWNER_DRAWN
 378     if ( m_windowStyle & wxLB_OWNERDRAW )
 379     {
 380         WX_CLEAR_ARRAY(m_aItems);
 381     }
 382     else
 383 #endif // wxUSE_OWNER_DRAWN
 384     if ( HasClientObjectData() )
 385     {
 386         for ( size_t n = 0; n < (size_t)m_noItems; n++ )
 387         {
 388             delete GetClientObject(n);
 389         }
 390     }
 391 }
 392
 393 void wxListBox::SetSelection(int N, bool select)
 394 {
 395     wxCHECK_RET( N == wxNOT_FOUND ||
 396                     (N >= 0 && N < m_noItems),
 397                  wxT("invalid index in wxListBox::SetSelection") );
 398
 399     if ( HasMultipleSelection() )
 400     {
 401         SendMessage(GetHwnd(), LB_SETSEL, select, N);
 402     }
 403     else
 404     {
 405         SendMessage(GetHwnd(), LB_SETCURSEL, select ? N : -1, 0);
 406     }
 407 }
 408
 409 bool wxListBox::IsSelected(int N) const
 410 {
 411     wxCHECK_MSG( N >= 0 && N < m_noItems, false,
 412                  wxT("invalid index in wxListBox::Selected") );
 413
 414     return SendMessage(GetHwnd(), LB_GETSEL, N, 0) == 0 ? false : true;
 415 }
 416
 417 wxClientData* wxListBox::DoGetItemClientObject(int n) const
 418 {
 419     return (wxClientData *)DoGetItemClientData(n);
 420 }
 421
 422 void *wxListBox::DoGetItemClientData(int n) const
 423 {
 424     wxCHECK_MSG( n >= 0 && n < m_noItems, NULL,
 425                  wxT("invalid index in wxListBox::GetClientData") );
 426
 427     return (void *)SendMessage(GetHwnd(), LB_GETITEMDATA, n, 0);
 428 }
 429
 430 void wxListBox::DoSetItemClientObject(int n, wxClientData* clientData)
 431 {
 432     DoSetItemClientData(n, clientData);
 433 }
 434
 435 void wxListBox::DoSetItemClientData(int n, void *clientData)
 436 {
 437     wxCHECK_RET( n >= 0 && n < m_noItems,
 438                  wxT("invalid index in wxListBox::SetClientData") );
 439
 440 #if wxUSE_OWNER_DRAWN
 441     if ( m_windowStyle & wxLB_OWNERDRAW )
 442     {
 443         // client data must be pointer to wxOwnerDrawn, otherwise we would crash
 444         // in OnMeasure/OnDraw.
 445         wxFAIL_MSG(wxT("Can't use client data with owner-drawn listboxes"));
 446     }
 447 #endif // wxUSE_OWNER_DRAWN
 448
 449     if ( ListBox_SetItemData(GetHwnd(), n, clientData) == LB_ERR )
 450         wxLogDebug(wxT("LB_SETITEMDATA failed"));
 451 }
 452
 453 // Return number of selections and an array of selected integers
 454 int wxListBox::GetSelections(wxArrayInt& aSelections) const
 455 {
 456     aSelections.Empty();
 457
 458     if ( HasMultipleSelection() )
 459     {
 460         int countSel = ListBox_GetSelCount(GetHwnd());
 461         if ( countSel == LB_ERR )
 462         {
 463             wxLogDebug(_T("ListBox_GetSelCount failed"));
 464         }
 465         else if ( countSel != 0 )
 466         {
 467             int *selections = new int[countSel];
 468
 469             if ( ListBox_GetSelItems(GetHwnd(),
 470                                      countSel, selections) == LB_ERR )
 471             {
 472                 wxLogDebug(wxT("ListBox_GetSelItems failed"));
 473                 countSel = -1;
 474             }
 475             else
 476             {
 477                 aSelections.Alloc(countSel);
 478                 for ( int n = 0; n < countSel; n++ )
 479                     aSelections.Add(selections[n]);
 480             }
 481
 482             delete [] selections;
 483         }
 484
 485         return countSel;
 486     }
 487     else  // single-selection listbox
 488     {
 489         if (ListBox_GetCurSel(GetHwnd()) > -1)
 490             aSelections.Add(ListBox_GetCurSel(GetHwnd()));
 491
 492         return aSelections.Count();
 493     }
 494 }
 495
 496 // Get single selection, for single choice list items
 497 int wxListBox::GetSelection() const
 498 {
 499     wxCHECK_MSG( !HasMultipleSelection(),
 500                  -1,
 501                  wxT("GetSelection() can't be used with multiple-selection listboxes, use GetSelections() instead.") );
 502
 503     return ListBox_GetCurSel(GetHwnd());
 504 }
 505
 506 // Find string for position
 507 wxString wxListBox::GetString(int N) const
 508 {
 509     wxCHECK_MSG( N >= 0 && N < m_noItems, wxEmptyString,
 510                  wxT("invalid index in wxListBox::GetClientData") );
 511
 512     int len = ListBox_GetTextLen(GetHwnd(), N);
 513
 514     // +1 for terminating NUL
 515     wxString result;
 516     wxChar* buffer = result.GetWriteBuf(len + 1);
 517     ListBox_GetText(GetHwnd(), N, buffer);
 518     result.UngetWriteBuf();
 519
 520     return result;
 521 }
 522
 523 void
 524 wxListBox::DoInsertItems(const wxArrayString& items, int pos)
 525 {
 526     wxCHECK_RET( pos >= 0 && pos <= m_noItems,
 527                  wxT("invalid index in wxListBox::InsertItems") );
 528
 529     InvalidateBestSize();
 530
 531     int nItems = items.GetCount();
 532     for ( int i = 0; i < nItems; i++ )
 533     {
 534         int idx = ListBox_InsertString(GetHwnd(), i + pos, items[i]);
 535
 536 #if wxUSE_OWNER_DRAWN
 537         if ( m_windowStyle & wxLB_OWNERDRAW )
 538         {
 539             wxOwnerDrawn *pNewItem = CreateLboxItem(idx);
 540             pNewItem->SetName(items[i]);
 541             pNewItem->SetFont(GetFont());
 542             m_aItems.Insert(pNewItem, idx);
 543
 544             ListBox_SetItemData(GetHwnd(), idx, pNewItem);
 545         }
 546 #else
 547         wxUnusedVar(idx);
 548 #endif // wxUSE_OWNER_DRAWN
 549     }
 550
 551     m_noItems += nItems;
 552
 553     SetHorizontalExtent();
 554 }
 555
 556 void wxListBox::SetString(int N, const wxString& s)
 557 {
 558     wxCHECK_RET( N >= 0 && N < m_noItems,
 559                  wxT("invalid index in wxListBox::SetString") );
 560
 561     // remember the state of the item
 562     bool wasSelected = IsSelected(N);
 563
 564     void *oldData = NULL;
 565     wxClientData *oldObjData = NULL;
 566     if ( m_clientDataItemsType == wxClientData_Void )
 567         oldData = GetClientData(N);
 568     else if ( m_clientDataItemsType == wxClientData_Object )
 569         oldObjData = GetClientObject(N);
 570
 571     // delete and recreate it
 572     SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);
 573
 574     int newN = N;
 575     if ( N == m_noItems - 1 )
 576         newN = -1;
 577
 578     ListBox_InsertString(GetHwnd(), newN, s);
 579
 580     // restore the client data
 581     if ( oldData )
 582         SetClientData(N, oldData);
 583     else if ( oldObjData )
 584         SetClientObject(N, oldObjData);
 585
 586 #if wxUSE_OWNER_DRAWN
 587     if ( m_windowStyle & wxLB_OWNERDRAW )
 588     {
 589         // update item's text
 590         m_aItems[N]->SetName(s);
 591
 592         // reassign the item's data
 593         ListBox_SetItemData(GetHwnd(), N, m_aItems[N]);
 594     }
 595 #endif  //USE_OWNER_DRAWN
 596
 597     // we may have lost the selection
 598     if ( wasSelected )
 599         Select(N);
 600 }
 601
 602 int wxListBox::GetCount() const
 603 {
 604     return m_noItems;
 605 }
 606
 607 // ----------------------------------------------------------------------------
 608 // helpers
 609 // ----------------------------------------------------------------------------
 610
 611 // Windows-specific code to set the horizontal extent of the listbox, if
 612 // necessary. If s is non-NULL, it's used to calculate the horizontal extent.
 613 // Otherwise, all strings are used.
 614 void wxListBox::SetHorizontalExtent(const wxString& s)
 615 {
 616     // Only necessary if we want a horizontal scrollbar
 617     if (!(m_windowStyle & wxHSCROLL))
 618         return;
 619     TEXTMETRIC lpTextMetric;
 620
 621     if ( !s.IsEmpty() )
 622     {
 623         int existingExtent = (int)SendMessage(GetHwnd(), LB_GETHORIZONTALEXTENT, 0, 0L);
 624         HDC dc = GetWindowDC(GetHwnd());
 625         HFONT oldFont = 0;
 626         if (GetFont().Ok() && GetFont().GetResourceHandle())
 627             oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
 628
 629         GetTextMetrics(dc, &lpTextMetric);
 630         SIZE extentXY;
 631         ::GetTextExtentPoint(dc, (LPTSTR) (const wxChar *)s, s.Length(), &extentXY);
 632         int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 633
 634         if (oldFont)
 635             ::SelectObject(dc, oldFont);
 636
 637         ReleaseDC(GetHwnd(), dc);
 638         if (extentX > existingExtent)
 639             SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(extentX), 0L);
 640     }
 641     else
 642     {
 643         int largestExtent = 0;
 644         HDC dc = GetWindowDC(GetHwnd());
 645         HFONT oldFont = 0;
 646         if (GetFont().Ok() && GetFont().GetResourceHandle())
 647             oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
 648
 649         GetTextMetrics(dc, &lpTextMetric);
 650
 651         // FIXME: buffer overflow!!
 652         wxChar buf[1024];
 653         for (int i = 0; i < m_noItems; i++)
 654         {
 655             int len = (int)SendMessage(GetHwnd(), LB_GETTEXT, i, (LPARAM)buf);
 656             buf[len] = 0;
 657             SIZE extentXY;
 658             ::GetTextExtentPoint(dc, buf, len, &extentXY);
 659             int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 660             if (extentX > largestExtent)
 661                 largestExtent = extentX;
 662         }
 663         if (oldFont)
 664             ::SelectObject(dc, oldFont);
 665
 666         ReleaseDC(GetHwnd(), dc);
 667         SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(largestExtent), 0L);
 668     }
 669 }
 670
 671 wxSize wxListBox::DoGetBestSize() const
 672 {
 673     // find the widest string
 674     int wLine;
 675     int wListbox = 0;
 676     for ( int i = 0; i < m_noItems; i++ )
 677     {
 678         wxString str(GetString(i));
 679         GetTextExtent(str, &wLine, NULL);
 680         if ( wLine > wListbox )
 681             wListbox = wLine;
 682     }
 683
 684     // give it some reasonable default value if there are no strings in the
 685     // list
 686     if ( wListbox == 0 )
 687         wListbox = 100;
 688
 689     // the listbox should be slightly larger than the widest string
 690     int cx, cy;
 691     wxGetCharSize(GetHWND(), &cx, &cy, GetFont());
 692
 693     wListbox += 3*cx;
 694
 695     // don't make the listbox too tall (limit height to 10 items) but don't
 696     // make it too small neither
 697     int hListbox = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy)*
 698                     wxMin(wxMax(m_noItems, 3), 10);
 699
 700     return wxSize(wListbox, hListbox);
 701 }
 702
 703 // ----------------------------------------------------------------------------
 704 // callbacks
 705 // ----------------------------------------------------------------------------
 706
 707 bool wxListBox::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 708 {
 709     wxEventType evtType;
 710     if ( param == LBN_SELCHANGE )
 711     {
 712         evtType = wxEVT_COMMAND_LISTBOX_SELECTED;
 713     }
 714     else if ( param == LBN_DBLCLK )
 715     {
 716         evtType = wxEVT_COMMAND_LISTBOX_DOUBLECLICKED;
 717     }
 718     else
 719     {
 720         // some event we're not interested in
 721         return false;
 722     }
 723
 724     wxCommandEvent event(evtType, m_windowId);
 725     event.SetEventObject( this );
 726
 727     // retrieve the affected item
 728     int n = SendMessage(GetHwnd(), LB_GETCARETINDEX, 0, 0);
 729     if ( n != LB_ERR )
 730     {
 731         if ( HasClientObjectData() )
 732             event.SetClientObject( GetClientObject(n) );
 733         else if ( HasClientUntypedData() )
 734             event.SetClientData( GetClientData(n) );
 735
 736         event.SetString( GetString(n) );
 737         event.SetExtraLong( HasMultipleSelection() ? IsSelected(n) : true );
 738     }
 739
 740     event.m_commandInt = n;
 741
 742     return GetEventHandler()->ProcessEvent(event);
 743 }
 744
 745 // ----------------------------------------------------------------------------
 746 // wxCheckListBox support
 747 // ----------------------------------------------------------------------------
 748
 749 #if wxUSE_OWNER_DRAWN
 750
 751 // drawing
 752 // -------
 753
 754 // space beneath/above each row in pixels
 755 // "standard" checklistbox use 1 here, some might prefer 2. 0 is ugly.
 756 #define OWNER_DRAWN_LISTBOX_EXTRA_SPACE    (1)
 757
 758 // the height is the same for all items
 759 // TODO should be changed for LBS_OWNERDRAWVARIABLE style listboxes
 760
 761 // NB: can't forward this to wxListBoxItem because LB_SETITEMDATA
 762 //     message is not yet sent when we get here!
 763 bool wxListBox::MSWOnMeasure(WXMEASUREITEMSTRUCT *item)
 764 {
 765     // only owner-drawn control should receive this message
 766     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), false );
 767
 768     MEASUREITEMSTRUCT *pStruct = (MEASUREITEMSTRUCT *)item;
 769
 770 #ifdef __WXWINCE__
 771     HDC hdc = GetDC(NULL);
 772 #else
 773     HDC hdc = CreateIC(wxT("DISPLAY"), NULL, NULL, 0);
 774 #endif
 775
 776     wxDC dc;
 777     dc.SetHDC((WXHDC)hdc);
 778     dc.SetFont(GetFont());
 779
 780     pStruct->itemHeight = dc.GetCharHeight() + 2*OWNER_DRAWN_LISTBOX_EXTRA_SPACE;
 781     pStruct->itemWidth  = dc.GetCharWidth();
 782
 783     dc.SetHDC(0);
 784
 785     DeleteDC(hdc);
 786
 787     return true;
 788 }
 789
 790 // forward the message to the appropriate item
 791 bool wxListBox::MSWOnDraw(WXDRAWITEMSTRUCT *item)
 792 {
 793     // only owner-drawn control should receive this message
 794     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), false );
 795
 796     DRAWITEMSTRUCT *pStruct = (DRAWITEMSTRUCT *)item;
 797     UINT itemID = pStruct->itemID;
 798
 799     // the item may be -1 for an empty listbox
 800     if ( itemID == (UINT)-1 )
 801         return false;
 802
 803     long data = ListBox_GetItemData(GetHwnd(), pStruct->itemID);
 804
 805     wxCHECK( data && (data != LB_ERR), false );
 806
 807     wxListBoxItem *pItem = (wxListBoxItem *)data;
 808
 809     wxDCTemp dc((WXHDC)pStruct->hDC);
 810     wxPoint pt1(pStruct->rcItem.left, pStruct->rcItem.top);
 811     wxPoint pt2(pStruct->rcItem.right, pStruct->rcItem.bottom);
 812     wxRect rect(pt1, pt2);
 813
 814     return pItem->OnDrawItem(dc, rect,
 815                              (wxOwnerDrawn::wxODAction)pStruct->itemAction,
 816                              (wxOwnerDrawn::wxODStatus)pStruct->itemState);
 817 }
 818
 819 #endif // wxUSE_OWNER_DRAWN
 820
 821 #endif // wxUSE_LISTBOX