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 #if wxUSE_EXTENDED_RTTI
  47 WX_DEFINE_FLAGS( wxListBoxStyle )
  48
  49 wxBEGIN_FLAGS( wxListBoxStyle )
  50     // new style border flags, we put them first to
  51     // use them for streaming out
  52     wxFLAGS_MEMBER(wxBORDER_SIMPLE)
  53     wxFLAGS_MEMBER(wxBORDER_SUNKEN)
  54     wxFLAGS_MEMBER(wxBORDER_DOUBLE)
  55     wxFLAGS_MEMBER(wxBORDER_RAISED)
  56     wxFLAGS_MEMBER(wxBORDER_STATIC)
  57     wxFLAGS_MEMBER(wxBORDER_NONE)
  58
  59     // old style border flags
  60     wxFLAGS_MEMBER(wxSIMPLE_BORDER)
  61     wxFLAGS_MEMBER(wxSUNKEN_BORDER)
  62     wxFLAGS_MEMBER(wxDOUBLE_BORDER)
  63     wxFLAGS_MEMBER(wxRAISED_BORDER)
  64     wxFLAGS_MEMBER(wxSTATIC_BORDER)
  65     wxFLAGS_MEMBER(wxBORDER)
  66
  67     // standard window styles
  68     wxFLAGS_MEMBER(wxTAB_TRAVERSAL)
  69     wxFLAGS_MEMBER(wxCLIP_CHILDREN)
  70     wxFLAGS_MEMBER(wxTRANSPARENT_WINDOW)
  71     wxFLAGS_MEMBER(wxWANTS_CHARS)
  72     wxFLAGS_MEMBER(wxFULL_REPAINT_ON_RESIZE)
  73     wxFLAGS_MEMBER(wxALWAYS_SHOW_SB )
  74     wxFLAGS_MEMBER(wxVSCROLL)
  75     wxFLAGS_MEMBER(wxHSCROLL)
  76
  77     wxFLAGS_MEMBER(wxLB_SINGLE)
  78     wxFLAGS_MEMBER(wxLB_MULTIPLE)
  79     wxFLAGS_MEMBER(wxLB_EXTENDED)
  80     wxFLAGS_MEMBER(wxLB_HSCROLL)
  81     wxFLAGS_MEMBER(wxLB_ALWAYS_SB)
  82     wxFLAGS_MEMBER(wxLB_NEEDED_SB)
  83     wxFLAGS_MEMBER(wxLB_SORT)
  84
  85 wxEND_FLAGS( wxListBoxStyle )
  86
  87 IMPLEMENT_DYNAMIC_CLASS_XTI(wxListBox, wxControl,"wx/listbox.h")
  88
  89 wxBEGIN_PROPERTIES_TABLE(wxListBox)
  90     wxEVENT_PROPERTY( Select , wxEVT_COMMAND_LISTBOX_SELECTED , wxCommandEvent )
  91     wxEVENT_PROPERTY( DoubleClick , wxEVT_COMMAND_LISTBOX_DOUBLECLICKED , wxCommandEvent )
  92
  93     wxPROPERTY( Font , wxFont , SetFont , GetFont  , EMPTY_MACROVALUE, 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
  94     wxPROPERTY_COLLECTION( Choices , wxArrayString , wxString , AppendString , GetStrings, 0 /*flags*/ , wxT("Helpstring") , wxT("group") )
  95     wxPROPERTY( Selection ,int, SetSelection, GetSelection, EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group") )
  96     wxPROPERTY_FLAGS( WindowStyle , wxListBoxStyle , long , SetWindowStyleFlag , GetWindowStyleFlag , EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group")) // style
  97 wxEND_PROPERTIES_TABLE()
  98
  99 wxBEGIN_HANDLERS_TABLE(wxListBox)
 100 wxEND_HANDLERS_TABLE()
 101
 102 wxCONSTRUCTOR_4( wxListBox , wxWindow* , Parent , wxWindowID , Id , wxPoint , Position , wxSize , Size )
 103 #else
 104 IMPLEMENT_DYNAMIC_CLASS(wxListBox, wxControl)
 105 #endif
 106
 107 /*
 108 TODO PROPERTIES
 109     selection
 110     content
 111         item
 112 */
 113
 114 // ============================================================================
 115 // list box item declaration and implementation
 116 // ============================================================================
 117
 118 #if wxUSE_OWNER_DRAWN
 119
 120 class wxListBoxItem : public wxOwnerDrawn
 121 {
 122 public:
 123     wxListBoxItem(const wxString& str = wxEmptyString);
 124 };
 125
 126 wxListBoxItem::wxListBoxItem(const wxString& str) : wxOwnerDrawn(str, false)
 127 {
 128     // no bitmaps/checkmarks
 129     SetMarginWidth(0);
 130 }
 131
 132 wxOwnerDrawn *wxListBox::CreateLboxItem(size_t WXUNUSED(n))
 133 {
 134     return new wxListBoxItem();
 135 }
 136
 137 #endif  //USE_OWNER_DRAWN
 138
 139 // ============================================================================
 140 // list box control implementation
 141 // ============================================================================
 142
 143 // ----------------------------------------------------------------------------
 144 // creation
 145 // ----------------------------------------------------------------------------
 146
 147 // Listbox item
 148 wxListBox::wxListBox()
 149 {
 150     m_noItems = 0;
 151     m_selected = 0;
 152 }
 153
 154 bool wxListBox::Create(wxWindow *parent,
 155                        wxWindowID id,
 156                        const wxPoint& pos,
 157                        const wxSize& size,
 158                        int n, const wxString choices[],
 159                        long style,
 160                        const wxValidator& validator,
 161                        const wxString& name)
 162 {
 163     m_noItems = 0;
 164     m_selected = 0;
 165
 166     // initialize base class fields
 167     if ( !CreateControl(parent, id, pos, size, style, validator, name) )
 168         return false;
 169
 170     // create the native control
 171     if ( !MSWCreateControl(_T("LISTBOX"), wxEmptyString, pos, size) )
 172     {
 173         // control creation failed
 174         return false;
 175     }
 176
 177     // Necessary to prevent scroll problems within a notebook with Windows
 178     // effects enabled
 179     SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW));
 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     InvalidateBestSize();
 288 }
 289
 290 int wxListBox::DoAppend(const wxString& item)
 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     InvalidateBestSize();
 308     return index;
 309 }
 310
 311 void wxListBox::DoSetItems(const wxArrayString& choices, void** clientData)
 312 {
 313     // avoid flicker - but don't need to do this for a hidden listbox
 314     bool hideAndShow = IsShown();
 315     if ( hideAndShow )
 316     {
 317         ShowWindow(GetHwnd(), SW_HIDE);
 318     }
 319
 320     ListBox_ResetContent(GetHwnd());
 321
 322     m_noItems = choices.GetCount();
 323     int i;
 324     for (i = 0; i < m_noItems; i++)
 325     {
 326         ListBox_AddString(GetHwnd(), choices[i]);
 327         if ( clientData )
 328         {
 329             SetClientData(i, clientData[i]);
 330         }
 331     }
 332
 333 #if wxUSE_OWNER_DRAWN
 334     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 335         // first delete old items
 336         WX_CLEAR_ARRAY(m_aItems);
 337
 338         // then create new ones
 339         for ( size_t ui = 0; ui < (size_t)m_noItems; ui++ ) {
 340             wxOwnerDrawn *pNewItem = CreateLboxItem(ui);
 341             pNewItem->SetName(choices[ui]);
 342             m_aItems.Add(pNewItem);
 343             ListBox_SetItemData(GetHwnd(), ui, pNewItem);
 344         }
 345     }
 346 #endif // wxUSE_OWNER_DRAWN
 347
 348     SetHorizontalExtent();
 349
 350     if ( hideAndShow )
 351     {
 352         // show the listbox back if we hid it
 353         ShowWindow(GetHwnd(), SW_SHOW);
 354     }
 355
 356     InvalidateBestSize();
 357 }
 358
 359 int wxListBox::FindString(const wxString& s) const
 360 {
 361     int pos = ListBox_FindStringExact(GetHwnd(), (WPARAM)-1, s);
 362     if (pos == LB_ERR)
 363         return wxNOT_FOUND;
 364     else
 365         return pos;
 366 }
 367
 368 void wxListBox::Clear()
 369 {
 370     Free();
 371
 372     ListBox_ResetContent(GetHwnd());
 373
 374     m_noItems = 0;
 375     SetHorizontalExtent();
 376
 377     InvalidateBestSize();
 378 }
 379
 380 void wxListBox::Free()
 381 {
 382 #if wxUSE_OWNER_DRAWN
 383     if ( m_windowStyle & wxLB_OWNERDRAW )
 384     {
 385         WX_CLEAR_ARRAY(m_aItems);
 386     }
 387     else
 388 #endif // wxUSE_OWNER_DRAWN
 389     if ( HasClientObjectData() )
 390     {
 391         for ( size_t n = 0; n < (size_t)m_noItems; n++ )
 392         {
 393             delete GetClientObject(n);
 394         }
 395     }
 396 }
 397
 398 void wxListBox::DoSetSelection(int N, bool select)
 399 {
 400     wxCHECK_RET( N == wxNOT_FOUND ||
 401                     (N >= 0 && N < m_noItems),
 402                  wxT("invalid index in wxListBox::SetSelection") );
 403
 404     if ( HasMultipleSelection() )
 405     {
 406         SendMessage(GetHwnd(), LB_SETSEL, select, N);
 407     }
 408     else
 409     {
 410         SendMessage(GetHwnd(), LB_SETCURSEL, select ? N : -1, 0);
 411     }
 412 }
 413
 414 bool wxListBox::IsSelected(int N) const
 415 {
 416     wxCHECK_MSG( N >= 0 && N < m_noItems, false,
 417                  wxT("invalid index in wxListBox::Selected") );
 418
 419     return SendMessage(GetHwnd(), LB_GETSEL, N, 0) == 0 ? false : true;
 420 }
 421
 422 wxClientData* wxListBox::DoGetItemClientObject(int n) const
 423 {
 424     return (wxClientData *)DoGetItemClientData(n);
 425 }
 426
 427 void *wxListBox::DoGetItemClientData(int n) const
 428 {
 429     wxCHECK_MSG( n >= 0 && n < m_noItems, NULL,
 430                  wxT("invalid index in wxListBox::GetClientData") );
 431
 432     return (void *)SendMessage(GetHwnd(), LB_GETITEMDATA, n, 0);
 433 }
 434
 435 void wxListBox::DoSetItemClientObject(int n, wxClientData* clientData)
 436 {
 437     DoSetItemClientData(n, clientData);
 438 }
 439
 440 void wxListBox::DoSetItemClientData(int n, void *clientData)
 441 {
 442     wxCHECK_RET( n >= 0 && n < m_noItems,
 443                  wxT("invalid index in wxListBox::SetClientData") );
 444
 445 #if wxUSE_OWNER_DRAWN
 446     if ( m_windowStyle & wxLB_OWNERDRAW )
 447     {
 448         // client data must be pointer to wxOwnerDrawn, otherwise we would crash
 449         // in OnMeasure/OnDraw.
 450         wxFAIL_MSG(wxT("Can't use client data with owner-drawn listboxes"));
 451     }
 452 #endif // wxUSE_OWNER_DRAWN
 453
 454     if ( ListBox_SetItemData(GetHwnd(), n, clientData) == LB_ERR )
 455         wxLogDebug(wxT("LB_SETITEMDATA failed"));
 456 }
 457
 458 // Return number of selections and an array of selected integers
 459 int wxListBox::GetSelections(wxArrayInt& aSelections) const
 460 {
 461     aSelections.Empty();
 462
 463     if ( HasMultipleSelection() )
 464     {
 465         int countSel = ListBox_GetSelCount(GetHwnd());
 466         if ( countSel == LB_ERR )
 467         {
 468             wxLogDebug(_T("ListBox_GetSelCount failed"));
 469         }
 470         else if ( countSel != 0 )
 471         {
 472             int *selections = new int[countSel];
 473
 474             if ( ListBox_GetSelItems(GetHwnd(),
 475                                      countSel, selections) == LB_ERR )
 476             {
 477                 wxLogDebug(wxT("ListBox_GetSelItems failed"));
 478                 countSel = -1;
 479             }
 480             else
 481             {
 482                 aSelections.Alloc(countSel);
 483                 for ( int n = 0; n < countSel; n++ )
 484                     aSelections.Add(selections[n]);
 485             }
 486
 487             delete [] selections;
 488         }
 489
 490         return countSel;
 491     }
 492     else  // single-selection listbox
 493     {
 494         if (ListBox_GetCurSel(GetHwnd()) > -1)
 495             aSelections.Add(ListBox_GetCurSel(GetHwnd()));
 496
 497         return aSelections.Count();
 498     }
 499 }
 500
 501 // Get single selection, for single choice list items
 502 int wxListBox::GetSelection() const
 503 {
 504     wxCHECK_MSG( !HasMultipleSelection(),
 505                  -1,
 506                  wxT("GetSelection() can't be used with multiple-selection listboxes, use GetSelections() instead.") );
 507
 508     return ListBox_GetCurSel(GetHwnd());
 509 }
 510
 511 // Find string for position
 512 wxString wxListBox::GetString(int N) const
 513 {
 514     wxCHECK_MSG( N >= 0 && N < m_noItems, wxEmptyString,
 515                  wxT("invalid index in wxListBox::GetString") );
 516
 517     int len = ListBox_GetTextLen(GetHwnd(), N);
 518
 519     // +1 for terminating NUL
 520     wxString result;
 521     ListBox_GetText(GetHwnd(), N, (wxChar*)wxStringBuffer(result, len + 1));
 522
 523     return result;
 524 }
 525
 526 void
 527 wxListBox::DoInsertItems(const wxArrayString& items, int pos)
 528 {
 529     wxCHECK_RET( pos >= 0 && pos <= m_noItems,
 530                  wxT("invalid index in wxListBox::InsertItems") );
 531
 532     int nItems = items.GetCount();
 533     for ( int i = 0; i < nItems; i++ )
 534     {
 535         int idx = ListBox_InsertString(GetHwnd(), i + pos, items[i]);
 536
 537 #if wxUSE_OWNER_DRAWN
 538         if ( m_windowStyle & wxLB_OWNERDRAW )
 539         {
 540             wxOwnerDrawn *pNewItem = CreateLboxItem(idx);
 541             pNewItem->SetName(items[i]);
 542             pNewItem->SetFont(GetFont());
 543             m_aItems.Insert(pNewItem, idx);
 544
 545             ListBox_SetItemData(GetHwnd(), idx, pNewItem);
 546         }
 547 #else
 548         wxUnusedVar(idx);
 549 #endif // wxUSE_OWNER_DRAWN
 550     }
 551
 552     m_noItems += nItems;
 553
 554     SetHorizontalExtent();
 555
 556     InvalidateBestSize();
 557 }
 558
 559 void wxListBox::SetString(int N, const wxString& s)
 560 {
 561     wxCHECK_RET( N >= 0 && N < m_noItems,
 562                  wxT("invalid index in wxListBox::SetString") );
 563
 564     // remember the state of the item
 565     bool wasSelected = IsSelected(N);
 566
 567     void *oldData = NULL;
 568     wxClientData *oldObjData = NULL;
 569     if ( m_clientDataItemsType == wxClientData_Void )
 570         oldData = GetClientData(N);
 571     else if ( m_clientDataItemsType == wxClientData_Object )
 572         oldObjData = GetClientObject(N);
 573
 574     // delete and recreate it
 575     SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);
 576
 577     int newN = N;
 578     if ( N == m_noItems - 1 )
 579         newN = -1;
 580
 581     ListBox_InsertString(GetHwnd(), newN, s);
 582
 583     // restore the client data
 584     if ( oldData )
 585         SetClientData(N, oldData);
 586     else if ( oldObjData )
 587         SetClientObject(N, oldObjData);
 588
 589 #if wxUSE_OWNER_DRAWN
 590     if ( m_windowStyle & wxLB_OWNERDRAW )
 591     {
 592         // update item's text
 593         m_aItems[N]->SetName(s);
 594
 595         // reassign the item's data
 596         ListBox_SetItemData(GetHwnd(), N, m_aItems[N]);
 597     }
 598 #endif  //USE_OWNER_DRAWN
 599
 600     // we may have lost the selection
 601     if ( wasSelected )
 602         Select(N);
 603
 604     InvalidateBestSize();
 605 }
 606
 607 int wxListBox::GetCount() const
 608 {
 609     return m_noItems;
 610 }
 611
 612 // ----------------------------------------------------------------------------
 613 // helpers
 614 // ----------------------------------------------------------------------------
 615
 616 // Windows-specific code to set the horizontal extent of the listbox, if
 617 // necessary. If s is non-NULL, it's used to calculate the horizontal extent.
 618 // Otherwise, all strings are used.
 619 void wxListBox::SetHorizontalExtent(const wxString& s)
 620 {
 621     // Only necessary if we want a horizontal scrollbar
 622     if (!(m_windowStyle & wxHSCROLL))
 623         return;
 624     TEXTMETRIC lpTextMetric;
 625
 626     if ( !s.empty() )
 627     {
 628         int existingExtent = (int)SendMessage(GetHwnd(), LB_GETHORIZONTALEXTENT, 0, 0L);
 629         HDC dc = GetWindowDC(GetHwnd());
 630         HFONT oldFont = 0;
 631         if (GetFont().Ok() && GetFont().GetResourceHandle() != 0)
 632             oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
 633
 634         GetTextMetrics(dc, &lpTextMetric);
 635         SIZE extentXY;
 636         ::GetTextExtentPoint32(dc, (LPTSTR) (const wxChar *)s, s.Length(), &extentXY);
 637         int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 638
 639         if (oldFont)
 640             ::SelectObject(dc, oldFont);
 641
 642         ReleaseDC(GetHwnd(), dc);
 643         if (extentX > existingExtent)
 644             SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(extentX), 0L);
 645     }
 646     else
 647     {
 648         int largestExtent = 0;
 649         HDC dc = GetWindowDC(GetHwnd());
 650         HFONT oldFont = 0;
 651         if (GetFont().Ok() && GetFont().GetResourceHandle() != 0)
 652             oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
 653
 654         GetTextMetrics(dc, &lpTextMetric);
 655
 656         for (int i = 0; i < m_noItems; i++)
 657         {
 658             wxString str = GetString(i);
 659             SIZE extentXY;
 660             ::GetTextExtentPoint32(dc, str.c_str(), str.length(), &extentXY);
 661             int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 662             if (extentX > largestExtent)
 663                 largestExtent = extentX;
 664         }
 665         if (oldFont)
 666             ::SelectObject(dc, oldFont);
 667
 668         ReleaseDC(GetHwnd(), dc);
 669         SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(largestExtent), 0L);
 670     }
 671 }
 672
 673 wxSize wxListBox::DoGetBestSize() const
 674 {
 675     // find the widest string
 676     int wLine;
 677     int wListbox = 0;
 678     for ( int i = 0; i < m_noItems; i++ )
 679     {
 680         wxString str(GetString(i));
 681         GetTextExtent(str, &wLine, NULL);
 682         if ( wLine > wListbox )
 683             wListbox = wLine;
 684     }
 685
 686     // give it some reasonable default value if there are no strings in the
 687     // list
 688     if ( wListbox == 0 )
 689         wListbox = 100;
 690
 691     // the listbox should be slightly larger than the widest string
 692     int cx, cy;
 693     wxGetCharSize(GetHWND(), &cx, &cy, GetFont());
 694
 695     wListbox += 3*cx;
 696
 697     // Add room for the scrollbar
 698     wListbox += wxSystemSettings::GetMetric(wxSYS_VSCROLL_X);
 699
 700     // don't make the listbox too tall (limit height to 10 items) but don't
 701     // make it too small neither
 702     int hListbox = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy)*
 703                     wxMin(wxMax(m_noItems, 3), 10);
 704
 705     wxSize best(wListbox, hListbox);
 706     CacheBestSize(best);
 707     return best;
 708 }
 709
 710 // ----------------------------------------------------------------------------
 711 // callbacks
 712 // ----------------------------------------------------------------------------
 713
 714 bool wxListBox::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 715 {
 716     wxEventType evtType;
 717     if ( param == LBN_SELCHANGE )
 718     {
 719         evtType = wxEVT_COMMAND_LISTBOX_SELECTED;
 720     }
 721     else if ( param == LBN_DBLCLK )
 722     {
 723         evtType = wxEVT_COMMAND_LISTBOX_DOUBLECLICKED;
 724     }
 725     else
 726     {
 727         // some event we're not interested in
 728         return false;
 729     }
 730
 731     wxCommandEvent event(evtType, m_windowId);
 732     event.SetEventObject( this );
 733
 734     // retrieve the affected item
 735     int n = SendMessage(GetHwnd(), LB_GETCARETINDEX, 0, 0);
 736     if ( n != LB_ERR )
 737     {
 738         if ( HasClientObjectData() )
 739             event.SetClientObject( GetClientObject(n) );
 740         else if ( HasClientUntypedData() )
 741             event.SetClientData( GetClientData(n) );
 742
 743         event.SetString( GetString(n) );
 744         event.SetExtraLong( HasMultipleSelection() ? IsSelected(n) : true );
 745     }
 746
 747     event.SetInt(n);
 748
 749     return GetEventHandler()->ProcessEvent(event);
 750 }
 751
 752 // ----------------------------------------------------------------------------
 753 // wxCheckListBox support
 754 // ----------------------------------------------------------------------------
 755
 756 #if wxUSE_OWNER_DRAWN
 757
 758 // drawing
 759 // -------
 760
 761 // space beneath/above each row in pixels
 762 // "standard" checklistbox use 1 here, some might prefer 2. 0 is ugly.
 763 #define OWNER_DRAWN_LISTBOX_EXTRA_SPACE    (1)
 764
 765 // the height is the same for all items
 766 // TODO should be changed for LBS_OWNERDRAWVARIABLE style listboxes
 767
 768 // NB: can't forward this to wxListBoxItem because LB_SETITEMDATA
 769 //     message is not yet sent when we get here!
 770 bool wxListBox::MSWOnMeasure(WXMEASUREITEMSTRUCT *item)
 771 {
 772     // only owner-drawn control should receive this message
 773     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), false );
 774
 775     MEASUREITEMSTRUCT *pStruct = (MEASUREITEMSTRUCT *)item;
 776
 777 #ifdef __WXWINCE__
 778     HDC hdc = GetDC(NULL);
 779 #else
 780     HDC hdc = CreateIC(wxT("DISPLAY"), NULL, NULL, 0);
 781 #endif
 782
 783     wxDC dc;
 784     dc.SetHDC((WXHDC)hdc);
 785     dc.SetFont(GetFont());
 786
 787     pStruct->itemHeight = dc.GetCharHeight() + 2*OWNER_DRAWN_LISTBOX_EXTRA_SPACE;
 788     pStruct->itemWidth  = dc.GetCharWidth();
 789
 790     dc.SetHDC(0);
 791
 792     DeleteDC(hdc);
 793
 794     return true;
 795 }
 796
 797 // forward the message to the appropriate item
 798 bool wxListBox::MSWOnDraw(WXDRAWITEMSTRUCT *item)
 799 {
 800     // only owner-drawn control should receive this message
 801     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), false );
 802
 803     DRAWITEMSTRUCT *pStruct = (DRAWITEMSTRUCT *)item;
 804     UINT itemID = pStruct->itemID;
 805
 806     // the item may be -1 for an empty listbox
 807     if ( itemID == (UINT)-1 )
 808         return false;
 809
 810     long data = ListBox_GetItemData(GetHwnd(), pStruct->itemID);
 811
 812     wxCHECK( data && (data != LB_ERR), false );
 813
 814     wxListBoxItem *pItem = (wxListBoxItem *)data;
 815
 816     wxDCTemp dc((WXHDC)pStruct->hDC);
 817     wxPoint pt1(pStruct->rcItem.left, pStruct->rcItem.top);
 818     wxPoint pt2(pStruct->rcItem.right, pStruct->rcItem.bottom);
 819     wxRect rect(pt1, pt2);
 820
 821     return pItem->OnDrawItem(dc, rect,
 822                              (wxOwnerDrawn::wxODAction)pStruct->itemAction,
 823                              (wxOwnerDrawn::wxODStatus)pStruct->itemState);
 824 }
 825
 826 #endif // wxUSE_OWNER_DRAWN
 827
 828 #endif // wxUSE_LISTBOX