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 IMPLEMENT_DYNAMIC_CLASS_XTI(wxListBox, wxControl,"wx/listbox.h")
  52
  53 WX_BEGIN_PROPERTIES_TABLE(wxListBox)
  54     // TODO DELEGATES
  55         WX_PROPERTY( Font , wxFont , SetFont , GetFont  , , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
  56     WX_PROPERTY_COLLECTION( Choices , wxArrayString , wxString , AppendString , GetStrings, 0 /*flags*/ , wxT("Helpstring") , wxT("group") )
  57         WX_PROPERTY( Selection ,int, SetSelection, GetSelection,, 0 /*flags*/ , wxT("Helpstring") , wxT("group") )
  58 WX_END_PROPERTIES_TABLE()
  59
  60 WX_BEGIN_HANDLERS_TABLE(wxListBox)
  61 WX_END_HANDLERS_TABLE()
  62
  63 WX_CONSTRUCTOR_4( wxListBox , wxWindow* , Parent , wxWindowID , Id , wxPoint , Position , wxSize , Size )
  64 #else
  65 IMPLEMENT_DYNAMIC_CLASS(wxListBox, wxControl)
  66 #endif
  67
  68 /*
  69 TODO PROPERTIES
  70         selection
  71         content
  72                 item
  73 */
  74
  75 // ============================================================================
  76 // list box item declaration and implementation
  77 // ============================================================================
  78
  79 #if wxUSE_OWNER_DRAWN
  80
  81 class wxListBoxItem : public wxOwnerDrawn
  82 {
  83 public:
  84     wxListBoxItem(const wxString& str = wxEmptyString);
  85 };
  86
  87 wxListBoxItem::wxListBoxItem(const wxString& str) : wxOwnerDrawn(str, FALSE)
  88 {
  89     // no bitmaps/checkmarks
  90     SetMarginWidth(0);
  91 }
  92
  93 wxOwnerDrawn *wxListBox::CreateLboxItem(size_t WXUNUSED(n))
  94 {
  95     return new wxListBoxItem();
  96 }
  97
  98 #endif  //USE_OWNER_DRAWN
  99
 100 // ============================================================================
 101 // list box control implementation
 102 // ============================================================================
 103
 104 // ----------------------------------------------------------------------------
 105 // creation
 106 // ----------------------------------------------------------------------------
 107
 108 // Listbox item
 109 wxListBox::wxListBox()
 110 {
 111     m_noItems = 0;
 112     m_selected = 0;
 113 }
 114
 115 bool wxListBox::Create(wxWindow *parent,
 116                        wxWindowID id,
 117                        const wxPoint& pos,
 118                        const wxSize& size,
 119                        int n, const wxString choices[],
 120                        long style,
 121                        const wxValidator& validator,
 122                        const wxString& name)
 123 {
 124     m_noItems = 0;
 125     m_hWnd = 0;
 126     m_selected = 0;
 127
 128     SetName(name);
 129 #if wxUSE_VALIDATORS
 130     SetValidator(validator);
 131 #endif // wxUSE_VALIDATORS
 132
 133     if (parent)
 134         parent->AddChild(this);
 135
 136     SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW));
 137     SetForegroundColour(parent->GetForegroundColour());
 138
 139     m_windowId = ( id == -1 ) ? (int)NewControlId() : id;
 140
 141     int x = pos.x;
 142     int y = pos.y;
 143     int width = size.x;
 144     int height = size.y;
 145     m_windowStyle = style;
 146
 147     DWORD wstyle = WS_VISIBLE | WS_CHILD | WS_VSCROLL | WS_TABSTOP |
 148                    LBS_NOTIFY | LBS_HASSTRINGS ;
 149
 150     wxASSERT_MSG( !(style & wxLB_MULTIPLE) || !(style & wxLB_EXTENDED),
 151                   _T("only one of listbox selection modes can be specified") );
 152
 153     if ( (m_windowStyle & wxBORDER_MASK) == wxBORDER_DEFAULT )
 154         m_windowStyle |= wxBORDER_SUNKEN;
 155
 156     if ( m_windowStyle & wxCLIP_SIBLINGS )
 157         wstyle |= WS_CLIPSIBLINGS;
 158
 159     if (m_windowStyle & wxLB_MULTIPLE)
 160         wstyle |= LBS_MULTIPLESEL;
 161     else if (m_windowStyle & wxLB_EXTENDED)
 162         wstyle |= LBS_EXTENDEDSEL;
 163
 164     if (m_windowStyle & wxLB_ALWAYS_SB)
 165         wstyle |= LBS_DISABLENOSCROLL;
 166     if (m_windowStyle & wxLB_HSCROLL)
 167         wstyle |= WS_HSCROLL;
 168     if (m_windowStyle & wxLB_SORT)
 169         wstyle |= LBS_SORT;
 170
 171 #if wxUSE_OWNER_DRAWN && !defined(__WXWINCE__)
 172     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 173         // we don't support LBS_OWNERDRAWVARIABLE yet
 174         wstyle |= LBS_OWNERDRAWFIXED;
 175     }
 176 #endif
 177
 178     // Without this style, you get unexpected heights, so e.g. constraint layout
 179     // doesn't work properly
 180     wstyle |= LBS_NOINTEGRALHEIGHT;
 181
 182     WXDWORD exStyle = 0;
 183     (void) MSWGetStyle(m_windowStyle, & exStyle) ;
 184
 185     m_hWnd = (WXHWND)::CreateWindowEx(exStyle, wxT("LISTBOX"), NULL,
 186             wstyle ,
 187             0, 0, 0, 0,
 188             (HWND)parent->GetHWND(), (HMENU)m_windowId,
 189             wxGetInstance(), NULL);
 190
 191     wxCHECK_MSG( m_hWnd, FALSE, wxT("Failed to create listbox") );
 192
 193     // Subclass again to catch messages
 194     SubclassWin(m_hWnd);
 195
 196     size_t ui;
 197     for (ui = 0; ui < (size_t)n; ui++) {
 198         Append(choices[ui]);
 199     }
 200
 201     if ( (m_windowStyle & wxLB_MULTIPLE) == 0 )
 202         SendMessage(GetHwnd(), LB_SETCURSEL, 0, 0);
 203
 204     SetFont(parent->GetFont());
 205
 206     SetSize(x, y, width, height);
 207
 208     return TRUE;
 209 }
 210
 211 wxListBox::~wxListBox()
 212 {
 213     Free();
 214 }
 215
 216 void wxListBox::SetupColours()
 217 {
 218     SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW));
 219     SetForegroundColour(GetParent()->GetForegroundColour());
 220 }
 221
 222 // ----------------------------------------------------------------------------
 223 // implementation of wxListBoxBase methods
 224 // ----------------------------------------------------------------------------
 225
 226 void wxListBox::DoSetFirstItem(int N)
 227 {
 228     wxCHECK_RET( N >= 0 && N < m_noItems,
 229                  wxT("invalid index in wxListBox::SetFirstItem") );
 230
 231     SendMessage(GetHwnd(), LB_SETTOPINDEX, (WPARAM)N, (LPARAM)0);
 232 }
 233
 234 void wxListBox::Delete(int N)
 235 {
 236     wxCHECK_RET( N >= 0 && N < m_noItems,
 237                  wxT("invalid index in wxListBox::Delete") );
 238
 239     // for owner drawn objects, the data is used for storing wxOwnerDrawn
 240     // pointers and we shouldn't touch it
 241 #if !wxUSE_OWNER_DRAWN
 242     if ( !(m_windowStyle & wxLB_OWNERDRAW) )
 243 #endif // !wxUSE_OWNER_DRAWN
 244         if ( HasClientObjectData() )
 245         {
 246             delete GetClientObject(N);
 247         }
 248
 249     SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);
 250     m_noItems--;
 251
 252     SetHorizontalExtent(wxEmptyString);
 253 }
 254
 255 int wxListBox::DoAppend(const wxString& item)
 256 {
 257     int index = ListBox_AddString(GetHwnd(), item);
 258     m_noItems++;
 259
 260 #if wxUSE_OWNER_DRAWN
 261     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 262         wxOwnerDrawn *pNewItem = CreateLboxItem(index); // dummy argument
 263         pNewItem->SetName(item);
 264         m_aItems.Insert(pNewItem, index);
 265         ListBox_SetItemData(GetHwnd(), index, pNewItem);
 266         pNewItem->SetFont(GetFont());
 267     }
 268 #endif // wxUSE_OWNER_DRAWN
 269
 270     SetHorizontalExtent(item);
 271
 272     return index;
 273 }
 274
 275 void wxListBox::DoSetItems(const wxArrayString& choices, void** clientData)
 276 {
 277     // avoid flicker - but don't need to do this for a hidden listbox
 278     bool hideAndShow = IsShown();
 279     if ( hideAndShow )
 280     {
 281         ShowWindow(GetHwnd(), SW_HIDE);
 282     }
 283
 284     ListBox_ResetContent(GetHwnd());
 285
 286     m_noItems = choices.GetCount();
 287     int i;
 288     for (i = 0; i < m_noItems; i++)
 289     {
 290         ListBox_AddString(GetHwnd(), choices[i]);
 291         if ( clientData )
 292         {
 293             SetClientData(i, clientData[i]);
 294         }
 295     }
 296
 297 #if wxUSE_OWNER_DRAWN
 298     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 299         // first delete old items
 300         WX_CLEAR_ARRAY(m_aItems);
 301
 302         // then create new ones
 303         for ( size_t ui = 0; ui < (size_t)m_noItems; ui++ ) {
 304             wxOwnerDrawn *pNewItem = CreateLboxItem(ui);
 305             pNewItem->SetName(choices[ui]);
 306             m_aItems.Add(pNewItem);
 307             ListBox_SetItemData(GetHwnd(), ui, pNewItem);
 308         }
 309     }
 310 #endif // wxUSE_OWNER_DRAWN
 311
 312     SetHorizontalExtent();
 313
 314     if ( hideAndShow )
 315     {
 316         // show the listbox back if we hid it
 317         ShowWindow(GetHwnd(), SW_SHOW);
 318     }
 319 }
 320
 321 int wxListBox::FindString(const wxString& s) const
 322 {
 323     int pos = ListBox_FindStringExact(GetHwnd(), (WPARAM)-1, s);
 324     if (pos == LB_ERR)
 325         return wxNOT_FOUND;
 326     else
 327         return pos;
 328 }
 329
 330 void wxListBox::Clear()
 331 {
 332     Free();
 333
 334     ListBox_ResetContent(GetHwnd());
 335
 336     m_noItems = 0;
 337     SetHorizontalExtent();
 338 }
 339
 340 void wxListBox::Free()
 341 {
 342 #if wxUSE_OWNER_DRAWN
 343     if ( m_windowStyle & wxLB_OWNERDRAW )
 344     {
 345         WX_CLEAR_ARRAY(m_aItems);
 346     }
 347     else
 348 #endif // wxUSE_OWNER_DRAWN
 349     if ( HasClientObjectData() )
 350     {
 351         for ( size_t n = 0; n < (size_t)m_noItems; n++ )
 352         {
 353             delete GetClientObject(n);
 354         }
 355     }
 356 }
 357
 358 void wxListBox::SetSelection(int N, bool select)
 359 {
 360     wxCHECK_RET( N >= 0 && N < m_noItems,
 361                  wxT("invalid index in wxListBox::SetSelection") );
 362
 363     if ( HasMultipleSelection() )
 364     {
 365         SendMessage(GetHwnd(), LB_SETSEL, select, N);
 366     }
 367     else
 368     {
 369         SendMessage(GetHwnd(), LB_SETCURSEL, select ? N : -1, 0);
 370     }
 371 }
 372
 373 bool wxListBox::IsSelected(int N) const
 374 {
 375     wxCHECK_MSG( N >= 0 && N < m_noItems, FALSE,
 376                  wxT("invalid index in wxListBox::Selected") );
 377
 378     return SendMessage(GetHwnd(), LB_GETSEL, N, 0) == 0 ? FALSE : TRUE;
 379 }
 380
 381 wxClientData* wxListBox::DoGetItemClientObject(int n) const
 382 {
 383     return (wxClientData *)DoGetItemClientData(n);
 384 }
 385
 386 void *wxListBox::DoGetItemClientData(int n) const
 387 {
 388     wxCHECK_MSG( n >= 0 && n < m_noItems, NULL,
 389                  wxT("invalid index in wxListBox::GetClientData") );
 390
 391     return (void *)SendMessage(GetHwnd(), LB_GETITEMDATA, n, 0);
 392 }
 393
 394 void wxListBox::DoSetItemClientObject(int n, wxClientData* clientData)
 395 {
 396     DoSetItemClientData(n, clientData);
 397 }
 398
 399 void wxListBox::DoSetItemClientData(int n, void *clientData)
 400 {
 401     wxCHECK_RET( n >= 0 && n < m_noItems,
 402                  wxT("invalid index in wxListBox::SetClientData") );
 403
 404 #if wxUSE_OWNER_DRAWN
 405     if ( m_windowStyle & wxLB_OWNERDRAW )
 406     {
 407         // client data must be pointer to wxOwnerDrawn, otherwise we would crash
 408         // in OnMeasure/OnDraw.
 409         wxFAIL_MSG(wxT("Can't use client data with owner-drawn listboxes"));
 410     }
 411 #endif // wxUSE_OWNER_DRAWN
 412
 413     if ( ListBox_SetItemData(GetHwnd(), n, clientData) == LB_ERR )
 414         wxLogDebug(wxT("LB_SETITEMDATA failed"));
 415 }
 416
 417 // Return number of selections and an array of selected integers
 418 int wxListBox::GetSelections(wxArrayInt& aSelections) const
 419 {
 420     aSelections.Empty();
 421
 422     if ( HasMultipleSelection() )
 423     {
 424         int countSel = ListBox_GetSelCount(GetHwnd());
 425         if ( countSel == LB_ERR )
 426         {
 427             wxLogDebug(_T("ListBox_GetSelCount failed"));
 428         }
 429         else if ( countSel != 0 )
 430         {
 431             int *selections = new int[countSel];
 432
 433             if ( ListBox_GetSelItems(GetHwnd(),
 434                                      countSel, selections) == LB_ERR )
 435             {
 436                 wxLogDebug(wxT("ListBox_GetSelItems failed"));
 437                 countSel = -1;
 438             }
 439             else
 440             {
 441                 aSelections.Alloc(countSel);
 442                 for ( int n = 0; n < countSel; n++ )
 443                     aSelections.Add(selections[n]);
 444             }
 445
 446             delete [] selections;
 447         }
 448
 449         return countSel;
 450     }
 451     else  // single-selection listbox
 452     {
 453         if (ListBox_GetCurSel(GetHwnd()) > -1)
 454             aSelections.Add(ListBox_GetCurSel(GetHwnd()));
 455
 456         return aSelections.Count();
 457     }
 458 }
 459
 460 // Get single selection, for single choice list items
 461 int wxListBox::GetSelection() const
 462 {
 463     wxCHECK_MSG( !HasMultipleSelection(),
 464                  -1,
 465                  wxT("GetSelection() can't be used with multiple-selection listboxes, use GetSelections() instead.") );
 466
 467     return ListBox_GetCurSel(GetHwnd());
 468 }
 469
 470 // Find string for position
 471 wxString wxListBox::GetString(int N) const
 472 {
 473     wxCHECK_MSG( N >= 0 && N < m_noItems, wxEmptyString,
 474                  wxT("invalid index in wxListBox::GetClientData") );
 475
 476     int len = ListBox_GetTextLen(GetHwnd(), N);
 477
 478     // +1 for terminating NUL
 479     wxString result;
 480     ListBox_GetText(GetHwnd(), N, wxStringBuffer(result, len + 1));
 481
 482     return result;
 483 }
 484
 485 void
 486 wxListBox::DoInsertItems(const wxArrayString& items, int pos)
 487 {
 488     wxCHECK_RET( pos >= 0 && pos <= m_noItems,
 489                  wxT("invalid index in wxListBox::InsertItems") );
 490
 491     int nItems = items.GetCount();
 492     for ( int i = 0; i < nItems; i++ )
 493     {
 494         int idx = ListBox_InsertString(GetHwnd(), i + pos, items[i]);
 495
 496 #if wxUSE_OWNER_DRAWN
 497         if ( m_windowStyle & wxLB_OWNERDRAW )
 498         {
 499             wxOwnerDrawn *pNewItem = CreateLboxItem(idx);
 500             pNewItem->SetName(items[i]);
 501             pNewItem->SetFont(GetFont());
 502             m_aItems.Insert(pNewItem, idx);
 503
 504             ListBox_SetItemData(GetHwnd(), idx, pNewItem);
 505         }
 506 #endif // wxUSE_OWNER_DRAWN
 507     }
 508
 509     m_noItems += nItems;
 510
 511     SetHorizontalExtent();
 512 }
 513
 514 void wxListBox::SetString(int N, const wxString& s)
 515 {
 516     wxCHECK_RET( N >= 0 && N < m_noItems,
 517                  wxT("invalid index in wxListBox::SetString") );
 518
 519     // remember the state of the item
 520     bool wasSelected = IsSelected(N);
 521
 522     void *oldData = NULL;
 523     wxClientData *oldObjData = NULL;
 524     if ( m_clientDataItemsType == wxClientData_Void )
 525         oldData = GetClientData(N);
 526     else if ( m_clientDataItemsType == wxClientData_Object )
 527         oldObjData = GetClientObject(N);
 528
 529     // delete and recreate it
 530     SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);
 531
 532     int newN = N;
 533     if ( N == m_noItems - 1 )
 534         newN = -1;
 535
 536     ListBox_InsertString(GetHwnd(), newN, s);
 537
 538     // restore the client data
 539     if ( oldData )
 540         SetClientData(N, oldData);
 541     else if ( oldObjData )
 542         SetClientObject(N, oldObjData);
 543
 544     // we may have lost the selection
 545     if ( wasSelected )
 546         Select(N);
 547
 548 #if wxUSE_OWNER_DRAWN
 549     if ( m_windowStyle & wxLB_OWNERDRAW )
 550     {
 551         // update item's text
 552         m_aItems[N]->SetName(s);
 553
 554         // reassign the item's data
 555         ListBox_SetItemData(GetHwnd(), N, m_aItems[N]);
 556     }
 557 #endif  //USE_OWNER_DRAWN
 558 }
 559
 560 int wxListBox::GetCount() const
 561 {
 562     return m_noItems;
 563 }
 564
 565 // ----------------------------------------------------------------------------
 566 // helpers
 567 // ----------------------------------------------------------------------------
 568
 569 // Windows-specific code to set the horizontal extent of the listbox, if
 570 // necessary. If s is non-NULL, it's used to calculate the horizontal extent.
 571 // Otherwise, all strings are used.
 572 void wxListBox::SetHorizontalExtent(const wxString& s)
 573 {
 574     // Only necessary if we want a horizontal scrollbar
 575     if (!(m_windowStyle & wxHSCROLL))
 576         return;
 577     TEXTMETRIC lpTextMetric;
 578
 579     if ( !s.IsEmpty() )
 580     {
 581         int existingExtent = (int)SendMessage(GetHwnd(), LB_GETHORIZONTALEXTENT, 0, 0L);
 582         HDC dc = GetWindowDC(GetHwnd());
 583         HFONT oldFont = 0;
 584         if (GetFont().Ok() && GetFont().GetResourceHandle())
 585             oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
 586
 587         GetTextMetrics(dc, &lpTextMetric);
 588         SIZE extentXY;
 589         ::GetTextExtentPoint(dc, (LPTSTR) (const wxChar *)s, s.Length(), &extentXY);
 590         int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 591
 592         if (oldFont)
 593             ::SelectObject(dc, oldFont);
 594
 595         ReleaseDC(GetHwnd(), dc);
 596         if (extentX > existingExtent)
 597             SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(extentX), 0L);
 598     }
 599     else
 600     {
 601         int largestExtent = 0;
 602         HDC dc = GetWindowDC(GetHwnd());
 603         HFONT oldFont = 0;
 604         if (GetFont().Ok() && GetFont().GetResourceHandle())
 605             oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
 606
 607         GetTextMetrics(dc, &lpTextMetric);
 608
 609         // FIXME: buffer overflow!!
 610         wxChar buf[1024];
 611         for (int i = 0; i < m_noItems; i++)
 612         {
 613             int len = (int)SendMessage(GetHwnd(), LB_GETTEXT, i, (LPARAM)buf);
 614             buf[len] = 0;
 615             SIZE extentXY;
 616             ::GetTextExtentPoint(dc, buf, len, &extentXY);
 617             int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 618             if (extentX > largestExtent)
 619                 largestExtent = extentX;
 620         }
 621         if (oldFont)
 622             ::SelectObject(dc, oldFont);
 623
 624         ReleaseDC(GetHwnd(), dc);
 625         SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(largestExtent), 0L);
 626     }
 627 }
 628
 629 wxSize wxListBox::DoGetBestSize() const
 630 {
 631     // find the widest string
 632     int wLine;
 633     int wListbox = 0;
 634     for ( int i = 0; i < m_noItems; i++ )
 635     {
 636         wxString str(GetString(i));
 637         GetTextExtent(str, &wLine, NULL);
 638         if ( wLine > wListbox )
 639             wListbox = wLine;
 640     }
 641
 642     // give it some reasonable default value if there are no strings in the
 643     // list
 644     if ( wListbox == 0 )
 645         wListbox = 100;
 646
 647     // the listbox should be slightly larger than the widest string
 648     int cx, cy;
 649     wxGetCharSize(GetHWND(), &cx, &cy, &GetFont());
 650
 651     wListbox += 3*cx;
 652
 653     // don't make the listbox too tall (limit height to 10 items) but don't
 654     // make it too small neither
 655     int hListbox = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy)*
 656                     wxMin(wxMax(m_noItems, 3), 10);
 657
 658     return wxSize(wListbox, hListbox);
 659 }
 660
 661 // ----------------------------------------------------------------------------
 662 // callbacks
 663 // ----------------------------------------------------------------------------
 664
 665 bool wxListBox::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 666 {
 667     wxEventType evtType;
 668     if ( param == LBN_SELCHANGE )
 669     {
 670         evtType = wxEVT_COMMAND_LISTBOX_SELECTED;
 671     }
 672     else if ( param == LBN_DBLCLK )
 673     {
 674         evtType = wxEVT_COMMAND_LISTBOX_DOUBLECLICKED;
 675     }
 676     else
 677     {
 678         // some event we're not interested in
 679         return FALSE;
 680     }
 681
 682     wxCommandEvent event(evtType, m_windowId);
 683     event.SetEventObject( this );
 684
 685     // retrieve the affected item
 686     int n = SendMessage(GetHwnd(), LB_GETCARETINDEX, 0, 0);
 687     if ( n != LB_ERR )
 688     {
 689         if ( HasClientObjectData() )
 690             event.SetClientObject( GetClientObject(n) );
 691         else if ( HasClientUntypedData() )
 692             event.SetClientData( GetClientData(n) );
 693
 694         event.SetString( GetString(n) );
 695         event.SetExtraLong( HasMultipleSelection() ? IsSelected(n) : TRUE );
 696     }
 697
 698     event.m_commandInt = n;
 699
 700     return GetEventHandler()->ProcessEvent(event);
 701 }
 702
 703 // ----------------------------------------------------------------------------
 704 // wxCheckListBox support
 705 // ----------------------------------------------------------------------------
 706
 707 #if wxUSE_OWNER_DRAWN
 708
 709 // drawing
 710 // -------
 711
 712 // space beneath/above each row in pixels
 713 // "standard" checklistbox use 1 here, some might prefer 2. 0 is ugly.
 714 #define OWNER_DRAWN_LISTBOX_EXTRA_SPACE    (1)
 715
 716 // the height is the same for all items
 717 // TODO should be changed for LBS_OWNERDRAWVARIABLE style listboxes
 718
 719 // NB: can't forward this to wxListBoxItem because LB_SETITEMDATA
 720 //     message is not yet sent when we get here!
 721 bool wxListBox::MSWOnMeasure(WXMEASUREITEMSTRUCT *item)
 722 {
 723     // only owner-drawn control should receive this message
 724     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), FALSE );
 725
 726     MEASUREITEMSTRUCT *pStruct = (MEASUREITEMSTRUCT *)item;
 727
 728 #ifdef __WXWINCE__
 729     HDC hdc = GetDC(NULL);
 730 #else
 731     HDC hdc = CreateIC(wxT("DISPLAY"), NULL, NULL, 0);
 732 #endif
 733
 734     wxDC dc;
 735     dc.SetHDC((WXHDC)hdc);
 736     dc.SetFont(wxSystemSettings::GetFont(wxSYS_ANSI_VAR_FONT));
 737
 738     pStruct->itemHeight = dc.GetCharHeight() + 2*OWNER_DRAWN_LISTBOX_EXTRA_SPACE;
 739     pStruct->itemWidth  = dc.GetCharWidth();
 740
 741     dc.SetHDC(0);
 742
 743     DeleteDC(hdc);
 744
 745     return TRUE;
 746 }
 747
 748 // forward the message to the appropriate item
 749 bool wxListBox::MSWOnDraw(WXDRAWITEMSTRUCT *item)
 750 {
 751     // only owner-drawn control should receive this message
 752     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), FALSE );
 753
 754     DRAWITEMSTRUCT *pStruct = (DRAWITEMSTRUCT *)item;
 755     UINT itemID = pStruct->itemID;
 756
 757     // the item may be -1 for an empty listbox
 758     if ( itemID == (UINT)-1 )
 759         return FALSE;
 760
 761     long data = ListBox_GetItemData(GetHwnd(), pStruct->itemID);
 762
 763     wxCHECK( data && (data != LB_ERR), FALSE );
 764
 765     wxListBoxItem *pItem = (wxListBoxItem *)data;
 766
 767     wxDCTemp dc((WXHDC)pStruct->hDC);
 768     wxRect rect(wxPoint(pStruct->rcItem.left, pStruct->rcItem.top),
 769                 wxPoint(pStruct->rcItem.right, pStruct->rcItem.bottom));
 770
 771     return pItem->OnDrawItem(dc, rect,
 772                              (wxOwnerDrawn::wxODAction)pStruct->itemAction,
 773                              (wxOwnerDrawn::wxODStatus)pStruct->itemState);
 774 }
 775
 776 #endif // wxUSE_OWNER_DRAWN
 777
 778 #endif // wxUSE_LISTBOX