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 // For compilers that support precompilation, includes "wx.h".
  13 #include "wx/wxprec.h"
  14
  15 #ifdef __BORLANDC__
  16     #pragma hdrstop
  17 #endif
  18
  19 #if wxUSE_LISTBOX
  20
  21 #include "wx/listbox.h"
  22
  23 #ifndef WX_PRECOMP
  24     #include "wx/dynarray.h"
  25     #include "wx/settings.h"
  26     #include "wx/brush.h"
  27     #include "wx/font.h"
  28     #include "wx/dc.h"
  29     #include "wx/utils.h"
  30     #include "wx/log.h"
  31     #include "wx/window.h"
  32 #endif
  33
  34 #include "wx/msw/private.h"
  35
  36 #include <windowsx.h>
  37
  38 #if wxUSE_OWNER_DRAWN
  39     #include  "wx/ownerdrw.h"
  40 #endif
  41
  42 #if wxUSE_EXTENDED_RTTI
  43 WX_DEFINE_FLAGS( wxListBoxStyle )
  44
  45 wxBEGIN_FLAGS( wxListBoxStyle )
  46     // new style border flags, we put them first to
  47     // use them for streaming out
  48     wxFLAGS_MEMBER(wxBORDER_SIMPLE)
  49     wxFLAGS_MEMBER(wxBORDER_SUNKEN)
  50     wxFLAGS_MEMBER(wxBORDER_DOUBLE)
  51     wxFLAGS_MEMBER(wxBORDER_RAISED)
  52     wxFLAGS_MEMBER(wxBORDER_STATIC)
  53     wxFLAGS_MEMBER(wxBORDER_NONE)
  54
  55     // old style border flags
  56     wxFLAGS_MEMBER(wxSIMPLE_BORDER)
  57     wxFLAGS_MEMBER(wxSUNKEN_BORDER)
  58     wxFLAGS_MEMBER(wxDOUBLE_BORDER)
  59     wxFLAGS_MEMBER(wxRAISED_BORDER)
  60     wxFLAGS_MEMBER(wxSTATIC_BORDER)
  61     wxFLAGS_MEMBER(wxBORDER)
  62
  63     // standard window styles
  64     wxFLAGS_MEMBER(wxTAB_TRAVERSAL)
  65     wxFLAGS_MEMBER(wxCLIP_CHILDREN)
  66     wxFLAGS_MEMBER(wxTRANSPARENT_WINDOW)
  67     wxFLAGS_MEMBER(wxWANTS_CHARS)
  68     wxFLAGS_MEMBER(wxFULL_REPAINT_ON_RESIZE)
  69     wxFLAGS_MEMBER(wxALWAYS_SHOW_SB )
  70     wxFLAGS_MEMBER(wxVSCROLL)
  71     wxFLAGS_MEMBER(wxHSCROLL)
  72
  73     wxFLAGS_MEMBER(wxLB_SINGLE)
  74     wxFLAGS_MEMBER(wxLB_MULTIPLE)
  75     wxFLAGS_MEMBER(wxLB_EXTENDED)
  76     wxFLAGS_MEMBER(wxLB_HSCROLL)
  77     wxFLAGS_MEMBER(wxLB_ALWAYS_SB)
  78     wxFLAGS_MEMBER(wxLB_NEEDED_SB)
  79     wxFLAGS_MEMBER(wxLB_SORT)
  80
  81 wxEND_FLAGS( wxListBoxStyle )
  82
  83 IMPLEMENT_DYNAMIC_CLASS_XTI(wxListBox, wxControlWithItems,"wx/listbox.h")
  84
  85 wxBEGIN_PROPERTIES_TABLE(wxListBox)
  86     wxEVENT_PROPERTY( Select , wxEVT_COMMAND_LISTBOX_SELECTED , wxCommandEvent )
  87     wxEVENT_PROPERTY( DoubleClick , wxEVT_COMMAND_LISTBOX_DOUBLECLICKED , wxCommandEvent )
  88
  89     wxPROPERTY( Font , wxFont , SetFont , GetFont  , EMPTY_MACROVALUE, 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
  90     wxPROPERTY_COLLECTION( Choices , wxArrayString , wxString , AppendString , GetStrings, 0 /*flags*/ , wxT("Helpstring") , wxT("group") )
  91     wxPROPERTY( Selection ,int, SetSelection, GetSelection, EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group") )
  92     wxPROPERTY_FLAGS( WindowStyle , wxListBoxStyle , long , SetWindowStyleFlag , GetWindowStyleFlag , EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group")) // style
  93 wxEND_PROPERTIES_TABLE()
  94
  95 wxBEGIN_HANDLERS_TABLE(wxListBox)
  96 wxEND_HANDLERS_TABLE()
  97
  98 wxCONSTRUCTOR_4( wxListBox , wxWindow* , Parent , wxWindowID , Id , wxPoint , Position , wxSize , Size )
  99 #else
 100 IMPLEMENT_DYNAMIC_CLASS(wxListBox, wxControlWithItems)
 101 #endif
 102
 103 /*
 104 TODO PROPERTIES
 105     selection
 106     content
 107         item
 108 */
 109
 110 // ============================================================================
 111 // list box item declaration and implementation
 112 // ============================================================================
 113
 114 #if wxUSE_OWNER_DRAWN
 115
 116 class wxListBoxItem : public wxOwnerDrawn
 117 {
 118 public:
 119     wxListBoxItem(const wxString& str = wxEmptyString);
 120 };
 121
 122 wxListBoxItem::wxListBoxItem(const wxString& str) : wxOwnerDrawn(str, false)
 123 {
 124     // no bitmaps/checkmarks
 125     SetMarginWidth(0);
 126 }
 127
 128 wxOwnerDrawn *wxListBox::CreateLboxItem(size_t WXUNUSED(n))
 129 {
 130     return new wxListBoxItem();
 131 }
 132
 133 #endif  //USE_OWNER_DRAWN
 134
 135 // ============================================================================
 136 // list box control implementation
 137 // ============================================================================
 138
 139 // ----------------------------------------------------------------------------
 140 // creation
 141 // ----------------------------------------------------------------------------
 142
 143 // Listbox item
 144 wxListBox::wxListBox()
 145 {
 146     m_noItems = 0;
 147     m_selected = 0;
 148 }
 149
 150 bool wxListBox::Create(wxWindow *parent,
 151                        wxWindowID id,
 152                        const wxPoint& pos,
 153                        const wxSize& size,
 154                        int n, const wxString choices[],
 155                        long style,
 156                        const wxValidator& validator,
 157                        const wxString& name)
 158 {
 159     m_noItems = 0;
 160     m_selected = 0;
 161
 162     // initialize base class fields
 163     if ( !CreateControl(parent, id, pos, size, style, validator, name) )
 164         return false;
 165
 166     // create the native control
 167     if ( !MSWCreateControl(_T("LISTBOX"), wxEmptyString, pos, size) )
 168     {
 169         // control creation failed
 170         return false;
 171     }
 172
 173     // initialize the contents
 174     for ( int i = 0; i < n; i++ )
 175     {
 176         Append(choices[i]);
 177     }
 178
 179     // now we can compute our best size correctly, so do it if necessary
 180     SetInitialSize(size);
 181
 182     return true;
 183 }
 184
 185 bool wxListBox::Create(wxWindow *parent,
 186                        wxWindowID id,
 187                        const wxPoint& pos,
 188                        const wxSize& size,
 189                        const wxArrayString& choices,
 190                        long style,
 191                        const wxValidator& validator,
 192                        const wxString& name)
 193 {
 194     wxCArrayString chs(choices);
 195     return Create(parent, id, pos, size, chs.GetCount(), chs.GetStrings(),
 196                   style, validator, name);
 197 }
 198
 199 wxListBox::~wxListBox()
 200 {
 201     Free();
 202 }
 203
 204 WXDWORD wxListBox::MSWGetStyle(long style, WXDWORD *exstyle) const
 205 {
 206     WXDWORD msStyle = wxControl::MSWGetStyle(style, exstyle);
 207
 208     // always show the vertical scrollbar if necessary -- otherwise it is
 209     // impossible to use the control with the mouse
 210     msStyle |= WS_VSCROLL;
 211
 212     // we always want to get the notifications
 213     msStyle |= LBS_NOTIFY;
 214
 215     // without this style, you get unexpected heights, so e.g. constraint
 216     // layout doesn't work properly
 217     msStyle |= LBS_NOINTEGRALHEIGHT;
 218
 219     wxASSERT_MSG( !(style & wxLB_MULTIPLE) || !(style & wxLB_EXTENDED),
 220                   _T("only one of listbox selection modes can be specified") );
 221
 222     if ( style & wxLB_MULTIPLE )
 223         msStyle |= LBS_MULTIPLESEL;
 224     else if ( style & wxLB_EXTENDED )
 225         msStyle |= LBS_EXTENDEDSEL;
 226
 227     if ( m_windowStyle & wxLB_ALWAYS_SB )
 228         msStyle |= LBS_DISABLENOSCROLL;
 229     if ( m_windowStyle & wxLB_HSCROLL )
 230         msStyle |= WS_HSCROLL;
 231     if ( m_windowStyle & wxLB_SORT )
 232         msStyle |= LBS_SORT;
 233
 234 #if wxUSE_OWNER_DRAWN && !defined(__WXWINCE__)
 235     if ( m_windowStyle & wxLB_OWNERDRAW )
 236     {
 237         // we don't support LBS_OWNERDRAWVARIABLE yet and we also always put
 238         // the strings in the listbox for simplicity even though we could have
 239         // avoided it in this case
 240         msStyle |= LBS_OWNERDRAWFIXED | LBS_HASSTRINGS;
 241     }
 242 #endif // wxUSE_OWNER_DRAWN
 243
 244     return msStyle;
 245 }
 246
 247 // ----------------------------------------------------------------------------
 248 // implementation of wxListBoxBase methods
 249 // ----------------------------------------------------------------------------
 250
 251 void wxListBox::DoSetFirstItem(int N)
 252 {
 253     wxCHECK_RET( IsValid(N),
 254                  wxT("invalid index in wxListBox::SetFirstItem") );
 255
 256     SendMessage(GetHwnd(), LB_SETTOPINDEX, (WPARAM)N, (LPARAM)0);
 257 }
 258
 259 void wxListBox::Delete(unsigned int n)
 260 {
 261     wxCHECK_RET( IsValid(n),
 262                  wxT("invalid index in wxListBox::Delete") );
 263
 264     // for owner drawn objects, the data is used for storing wxOwnerDrawn
 265     // pointers and we shouldn't touch it
 266 #if !wxUSE_OWNER_DRAWN
 267     if ( !(m_windowStyle & wxLB_OWNERDRAW) )
 268 #endif // !wxUSE_OWNER_DRAWN
 269         if ( HasClientObjectData() )
 270         {
 271             delete GetClientObject(n);
 272         }
 273
 274     SendMessage(GetHwnd(), LB_DELETESTRING, n, 0);
 275     m_noItems--;
 276
 277     SetHorizontalExtent(wxEmptyString);
 278 }
 279
 280 int wxListBox::DoAppend(const wxString& item)
 281 {
 282     int index = ListBox_AddString(GetHwnd(), item.wx_str());
 283     m_noItems++;
 284
 285 #if wxUSE_OWNER_DRAWN
 286     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 287         wxOwnerDrawn *pNewItem = CreateLboxItem(index); // dummy argument
 288         pNewItem->SetName(item);
 289         m_aItems.Insert(pNewItem, index);
 290         ListBox_SetItemData(GetHwnd(), index, pNewItem);
 291         pNewItem->SetFont(GetFont());
 292     }
 293 #endif // wxUSE_OWNER_DRAWN
 294
 295     SetHorizontalExtent(item);
 296
 297     return index;
 298 }
 299
 300 void wxListBox::DoSetItems(const wxArrayString& choices, void** clientData)
 301 {
 302     // avoid flicker - but don't need to do this for a hidden listbox
 303     bool hideAndShow = IsShown();
 304     if ( hideAndShow )
 305     {
 306         ShowWindow(GetHwnd(), SW_HIDE);
 307     }
 308
 309     ListBox_ResetContent(GetHwnd());
 310
 311     m_noItems = choices.GetCount();
 312     unsigned int i;
 313     for (i = 0; i < m_noItems; i++)
 314     {
 315         ListBox_AddString(GetHwnd(), choices[i].wx_str());
 316         if ( clientData )
 317         {
 318             SetClientData(i, clientData[i]);
 319         }
 320     }
 321
 322 #if wxUSE_OWNER_DRAWN
 323     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 324         // first delete old items
 325         WX_CLEAR_ARRAY(m_aItems);
 326
 327         // then create new ones
 328         for ( unsigned int ui = 0; ui < m_noItems; ui++ ) {
 329             wxOwnerDrawn *pNewItem = CreateLboxItem(ui);
 330             pNewItem->SetName(choices[ui]);
 331             m_aItems.Add(pNewItem);
 332             ListBox_SetItemData(GetHwnd(), ui, pNewItem);
 333         }
 334     }
 335 #endif // wxUSE_OWNER_DRAWN
 336
 337     SetHorizontalExtent();
 338
 339     if ( hideAndShow )
 340     {
 341         // show the listbox back if we hid it
 342         ShowWindow(GetHwnd(), SW_SHOW);
 343     }
 344 }
 345
 346 int wxListBox::FindString(const wxString& s, bool bCase) const
 347 {
 348     // back to base class search for not native search type
 349     if (bCase)
 350        return wxItemContainerImmutable::FindString( s, bCase );
 351
 352     int pos = ListBox_FindStringExact(GetHwnd(), -1, s.wx_str());
 353     if (pos == LB_ERR)
 354         return wxNOT_FOUND;
 355     else
 356         return pos;
 357 }
 358
 359 void wxListBox::Clear()
 360 {
 361     Free();
 362
 363     ListBox_ResetContent(GetHwnd());
 364
 365     m_noItems = 0;
 366     SetHorizontalExtent();
 367 }
 368
 369 void wxListBox::Free()
 370 {
 371 #if wxUSE_OWNER_DRAWN
 372     if ( m_windowStyle & wxLB_OWNERDRAW )
 373     {
 374         WX_CLEAR_ARRAY(m_aItems);
 375     }
 376     else
 377 #endif // wxUSE_OWNER_DRAWN
 378     if ( HasClientObjectData() )
 379     {
 380         for ( unsigned int n = 0; n < m_noItems; n++ )
 381         {
 382             delete GetClientObject(n);
 383         }
 384     }
 385 }
 386
 387 void wxListBox::DoSetSelection(int N, bool select)
 388 {
 389     wxCHECK_RET( N == wxNOT_FOUND || IsValid(N),
 390                  wxT("invalid index in wxListBox::SetSelection") );
 391
 392     if ( HasMultipleSelection() )
 393     {
 394         SendMessage(GetHwnd(), LB_SETSEL, select, N);
 395     }
 396     else
 397     {
 398         SendMessage(GetHwnd(), LB_SETCURSEL, select ? N : -1, 0);
 399     }
 400 }
 401
 402 bool wxListBox::IsSelected(int N) const
 403 {
 404     wxCHECK_MSG( IsValid(N), false,
 405                  wxT("invalid index in wxListBox::Selected") );
 406
 407     return SendMessage(GetHwnd(), LB_GETSEL, N, 0) == 0 ? false : true;
 408 }
 409
 410 wxClientData* wxListBox::DoGetItemClientObject(unsigned int n) const
 411 {
 412     return (wxClientData *)DoGetItemClientData(n);
 413 }
 414
 415 void *wxListBox::DoGetItemClientData(unsigned int n) const
 416 {
 417     wxCHECK_MSG( IsValid(n), NULL,
 418                  wxT("invalid index in wxListBox::GetClientData") );
 419
 420     return (void *)SendMessage(GetHwnd(), LB_GETITEMDATA, n, 0);
 421 }
 422
 423 void wxListBox::DoSetItemClientObject(unsigned int n, wxClientData* clientData)
 424 {
 425     DoSetItemClientData(n, clientData);
 426 }
 427
 428 void wxListBox::DoSetItemClientData(unsigned int n, void *clientData)
 429 {
 430     wxCHECK_RET( IsValid(n),
 431                  wxT("invalid index in wxListBox::SetClientData") );
 432
 433 #if wxUSE_OWNER_DRAWN
 434     if ( m_windowStyle & wxLB_OWNERDRAW )
 435     {
 436         // client data must be pointer to wxOwnerDrawn, otherwise we would crash
 437         // in OnMeasure/OnDraw.
 438         wxFAIL_MSG(wxT("Can't use client data with owner-drawn listboxes"));
 439     }
 440 #endif // wxUSE_OWNER_DRAWN
 441
 442     if ( ListBox_SetItemData(GetHwnd(), n, clientData) == LB_ERR )
 443         wxLogDebug(wxT("LB_SETITEMDATA failed"));
 444 }
 445
 446 // Return number of selections and an array of selected integers
 447 int wxListBox::GetSelections(wxArrayInt& aSelections) const
 448 {
 449     aSelections.Empty();
 450
 451     if ( HasMultipleSelection() )
 452     {
 453         int countSel = ListBox_GetSelCount(GetHwnd());
 454         if ( countSel == LB_ERR )
 455         {
 456             wxLogDebug(_T("ListBox_GetSelCount failed"));
 457         }
 458         else if ( countSel != 0 )
 459         {
 460             int *selections = new int[countSel];
 461
 462             if ( ListBox_GetSelItems(GetHwnd(),
 463                                      countSel, selections) == LB_ERR )
 464             {
 465                 wxLogDebug(wxT("ListBox_GetSelItems failed"));
 466                 countSel = -1;
 467             }
 468             else
 469             {
 470                 aSelections.Alloc(countSel);
 471                 for ( int n = 0; n < countSel; n++ )
 472                     aSelections.Add(selections[n]);
 473             }
 474
 475             delete [] selections;
 476         }
 477
 478         return countSel;
 479     }
 480     else  // single-selection listbox
 481     {
 482         if (ListBox_GetCurSel(GetHwnd()) > -1)
 483             aSelections.Add(ListBox_GetCurSel(GetHwnd()));
 484
 485         return aSelections.Count();
 486     }
 487 }
 488
 489 // Get single selection, for single choice list items
 490 int wxListBox::GetSelection() const
 491 {
 492     wxCHECK_MSG( !HasMultipleSelection(),
 493                  -1,
 494                  wxT("GetSelection() can't be used with multiple-selection listboxes, use GetSelections() instead.") );
 495
 496     return ListBox_GetCurSel(GetHwnd());
 497 }
 498
 499 // Find string for position
 500 wxString wxListBox::GetString(unsigned int n) const
 501 {
 502     wxCHECK_MSG( IsValid(n), wxEmptyString,
 503                  wxT("invalid index in wxListBox::GetString") );
 504
 505     int len = ListBox_GetTextLen(GetHwnd(), n);
 506
 507     // +1 for terminating NUL
 508     wxString result;
 509     ListBox_GetText(GetHwnd(), n, (wxChar*)wxStringBuffer(result, len + 1));
 510
 511     return result;
 512 }
 513
 514 void
 515 wxListBox::DoInsertItems(const wxArrayString& items, unsigned int pos)
 516 {
 517     wxCHECK_RET( IsValidInsert(pos),
 518                  wxT("invalid index in wxListBox::InsertItems") );
 519
 520     unsigned int nItems = items.GetCount();
 521     for ( unsigned int i = 0; i < nItems; i++ )
 522     {
 523         int idx = ListBox_InsertString(GetHwnd(), i + pos, items[i].wx_str());
 524
 525 #if wxUSE_OWNER_DRAWN
 526         if ( m_windowStyle & wxLB_OWNERDRAW )
 527         {
 528             wxOwnerDrawn *pNewItem = CreateLboxItem(idx);
 529             pNewItem->SetName(items[i]);
 530             pNewItem->SetFont(GetFont());
 531             m_aItems.Insert(pNewItem, idx);
 532
 533             ListBox_SetItemData(GetHwnd(), idx, pNewItem);
 534         }
 535 #else
 536         wxUnusedVar(idx);
 537 #endif // wxUSE_OWNER_DRAWN
 538     }
 539
 540     m_noItems += nItems;
 541
 542     SetHorizontalExtent();
 543 }
 544
 545 int wxListBox::DoListHitTest(const wxPoint& point) const
 546 {
 547     LRESULT lRes =  ::SendMessage(GetHwnd(), LB_ITEMFROMPOINT,
 548                                   0L, MAKELONG(point.x, point.y));
 549
 550     // non zero high-order word means that this item is outside of the client
 551     // area, IOW the point is outside of the listbox
 552     return HIWORD(lRes) ? wxNOT_FOUND : lRes;
 553 }
 554
 555 void wxListBox::SetString(unsigned int n, const wxString& s)
 556 {
 557     wxCHECK_RET( IsValid(n),
 558                  wxT("invalid index in wxListBox::SetString") );
 559
 560     // remember the state of the item
 561     bool wasSelected = IsSelected(n);
 562
 563     void *oldData = NULL;
 564     wxClientData *oldObjData = NULL;
 565     if ( m_clientDataItemsType == wxClientData_Void )
 566         oldData = GetClientData(n);
 567     else if ( m_clientDataItemsType == wxClientData_Object )
 568         oldObjData = GetClientObject(n);
 569
 570     // delete and recreate it
 571     SendMessage(GetHwnd(), LB_DELETESTRING, n, 0);
 572
 573     int newN = n;
 574     if ( n == (m_noItems - 1) )
 575         newN = -1;
 576
 577     ListBox_InsertString(GetHwnd(), newN, s.wx_str());
 578
 579     // restore the client data
 580     if ( oldData )
 581         SetClientData(n, oldData);
 582     else if ( oldObjData )
 583         SetClientObject(n, oldObjData);
 584
 585 #if wxUSE_OWNER_DRAWN
 586     if ( m_windowStyle & wxLB_OWNERDRAW )
 587     {
 588         // update item's text
 589         m_aItems[n]->SetName(s);
 590
 591         // reassign the item's data
 592         ListBox_SetItemData(GetHwnd(), n, m_aItems[n]);
 593     }
 594 #endif  //USE_OWNER_DRAWN
 595
 596     // we may have lost the selection
 597     if ( wasSelected )
 598         Select(n);
 599
 600     SetHorizontalExtent();
 601 }
 602
 603 unsigned int wxListBox::GetCount() const
 604 {
 605     return m_noItems;
 606 }
 607
 608 // ----------------------------------------------------------------------------
 609 // size-related stuff
 610 // ----------------------------------------------------------------------------
 611
 612 void wxListBox::SetHorizontalExtent(const wxString& s)
 613 {
 614     // in any case, our best size could have changed
 615     InvalidateBestSize();
 616
 617     // the rest is only necessary if we want a horizontal scrollbar
 618     if ( !HasFlag(wxHSCROLL) )
 619         return;
 620
 621
 622     WindowHDC dc(GetHwnd());
 623     SelectInHDC selFont(dc, GetHfontOf(GetFont()));
 624
 625     TEXTMETRIC lpTextMetric;
 626     ::GetTextMetrics(dc, &lpTextMetric);
 627
 628     int largestExtent = 0;
 629     SIZE extentXY;
 630
 631     if ( s.empty() )
 632     {
 633         // set extent to the max length of all strings
 634         for ( unsigned int i = 0; i < m_noItems; i++ )
 635         {
 636             const wxString str = GetString(i);
 637             ::GetTextExtentPoint32(dc, str.c_str(), str.length(), &extentXY);
 638
 639             int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 640             if ( extentX > largestExtent )
 641                 largestExtent = extentX;
 642         }
 643     }
 644     else // just increase the extent to the length of this string
 645     {
 646         int existingExtent = (int)SendMessage(GetHwnd(),
 647                                               LB_GETHORIZONTALEXTENT, 0, 0L);
 648
 649         ::GetTextExtentPoint32(dc, s.c_str(), s.length(), &extentXY);
 650
 651         int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 652         if ( extentX > existingExtent )
 653             largestExtent = extentX;
 654     }
 655
 656     if ( largestExtent )
 657         SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(largestExtent), 0L);
 658     //else: it shouldn't change
 659 }
 660
 661 wxSize wxListBox::DoGetBestSize() const
 662 {
 663     // find the widest string
 664     int wLine;
 665     int wListbox = 0;
 666     for (unsigned int i = 0; i < m_noItems; i++)
 667     {
 668         wxString str(GetString(i));
 669         GetTextExtent(str, &wLine, NULL);
 670         if ( wLine > wListbox )
 671             wListbox = wLine;
 672     }
 673
 674     // give it some reasonable default value if there are no strings in the
 675     // list
 676     if ( wListbox == 0 )
 677         wListbox = 100;
 678
 679     // the listbox should be slightly larger than the widest string
 680     int cx, cy;
 681     wxGetCharSize(GetHWND(), &cx, &cy, GetFont());
 682
 683     wListbox += 3*cx;
 684
 685     // Add room for the scrollbar
 686     wListbox += wxSystemSettings::GetMetric(wxSYS_VSCROLL_X);
 687
 688     // don't make the listbox too tall (limit height to 10 items) but don't
 689     // make it too small neither
 690     int hListbox = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy)*
 691                     wxMin(wxMax(m_noItems, 3), 10);
 692
 693     wxSize best(wListbox, hListbox);
 694     CacheBestSize(best);
 695     return best;
 696 }
 697
 698 // ----------------------------------------------------------------------------
 699 // callbacks
 700 // ----------------------------------------------------------------------------
 701
 702 bool wxListBox::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 703 {
 704     wxEventType evtType;
 705     if ( param == LBN_SELCHANGE )
 706     {
 707         evtType = wxEVT_COMMAND_LISTBOX_SELECTED;
 708     }
 709     else if ( param == LBN_DBLCLK )
 710     {
 711         evtType = wxEVT_COMMAND_LISTBOX_DOUBLECLICKED;
 712     }
 713     else
 714     {
 715         // some event we're not interested in
 716         return false;
 717     }
 718
 719     wxCommandEvent event(evtType, m_windowId);
 720     event.SetEventObject( this );
 721
 722     // retrieve the affected item
 723     int n = SendMessage(GetHwnd(), LB_GETCARETINDEX, 0, 0);
 724     if ( n != LB_ERR )
 725     {
 726         if ( HasClientObjectData() )
 727             event.SetClientObject( GetClientObject(n) );
 728         else if ( HasClientUntypedData() )
 729             event.SetClientData( GetClientData(n) );
 730
 731         event.SetString(GetString(n));
 732         event.SetExtraLong( HasMultipleSelection() ? IsSelected(n) : true );
 733     }
 734
 735     event.SetInt(n);
 736
 737     return GetEventHandler()->ProcessEvent(event);
 738 }
 739
 740 // ----------------------------------------------------------------------------
 741 // wxCheckListBox support
 742 // ----------------------------------------------------------------------------
 743
 744 #if wxUSE_OWNER_DRAWN
 745
 746 // drawing
 747 // -------
 748
 749 // space beneath/above each row in pixels
 750 // "standard" checklistbox use 1 here, some might prefer 2. 0 is ugly.
 751 #define OWNER_DRAWN_LISTBOX_EXTRA_SPACE    (1)
 752
 753 // the height is the same for all items
 754 // TODO should be changed for LBS_OWNERDRAWVARIABLE style listboxes
 755
 756 // NB: can't forward this to wxListBoxItem because LB_SETITEMDATA
 757 //     message is not yet sent when we get here!
 758 bool wxListBox::MSWOnMeasure(WXMEASUREITEMSTRUCT *item)
 759 {
 760     // only owner-drawn control should receive this message
 761     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), false );
 762
 763     MEASUREITEMSTRUCT *pStruct = (MEASUREITEMSTRUCT *)item;
 764
 765 #ifdef __WXWINCE__
 766     HDC hdc = GetDC(NULL);
 767 #else
 768     HDC hdc = CreateIC(wxT("DISPLAY"), NULL, NULL, 0);
 769 #endif
 770
 771     {
 772         wxDCTemp dc((WXHDC)hdc);
 773         dc.SetFont(GetFont());
 774
 775         pStruct->itemHeight = dc.GetCharHeight() + 2*OWNER_DRAWN_LISTBOX_EXTRA_SPACE;
 776         pStruct->itemWidth  = dc.GetCharWidth();
 777     }
 778
 779 #ifdef __WXWINCE__
 780     ReleaseDC(NULL, hdc);
 781 #else
 782     DeleteDC(hdc);
 783 #endif
 784
 785     return true;
 786 }
 787
 788 // forward the message to the appropriate item
 789 bool wxListBox::MSWOnDraw(WXDRAWITEMSTRUCT *item)
 790 {
 791     // only owner-drawn control should receive this message
 792     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), false );
 793
 794     DRAWITEMSTRUCT *pStruct = (DRAWITEMSTRUCT *)item;
 795     UINT itemID = pStruct->itemID;
 796
 797     // the item may be -1 for an empty listbox
 798     if ( itemID == (UINT)-1 )
 799         return false;
 800
 801     LRESULT data = ListBox_GetItemData(GetHwnd(), pStruct->itemID);
 802
 803     wxCHECK( data && (data != LB_ERR), false );
 804
 805     wxListBoxItem *pItem = (wxListBoxItem *)data;
 806
 807     wxDCTemp dc((WXHDC)pStruct->hDC);
 808     wxPoint pt1(pStruct->rcItem.left, pStruct->rcItem.top);
 809     wxPoint pt2(pStruct->rcItem.right, pStruct->rcItem.bottom);
 810     wxRect rect(pt1, pt2);
 811
 812     return pItem->OnDrawItem(dc, rect,
 813                              (wxOwnerDrawn::wxODAction)pStruct->itemAction,
 814                              (wxOwnerDrawn::wxODStatus)pStruct->itemState);
 815 }
 816
 817 #endif // wxUSE_OWNER_DRAWN
 818
 819 #endif // wxUSE_LISTBOX