src/msw/listbox.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        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 license
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 #ifdef __GNUG__
  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 #include "wx/window.h"
  24 #include "wx/msw/private.h"
  25
  26 #ifndef WX_PRECOMP
  27 #include "wx/listbox.h"
  28 #include "wx/settings.h"
  29 #include "wx/brush.h"
  30 #include "wx/font.h"
  31 #include "wx/dc.h"
  32 #include "wx/utils.h"
  33 #endif
  34
  35 #include <windowsx.h>
  36
  37 #ifdef __WXWINE__
  38   #if defined(GetWindowStyle)
  39     #undef GetWindowStyle
  40   #endif
  41 #endif
  42
  43 #include "wx/dynarray.h"
  44 #include "wx/log.h"
  45
  46 #if wxUSE_OWNER_DRAWN
  47     #include  "wx/ownerdrw.h"
  48 #endif
  49
  50 #ifndef __TWIN32__
  51     #ifdef __GNUWIN32_OLD__
  52         #include "wx/msw/gnuwin32/extra.h"
  53     #endif
  54 #endif
  55
  56 #ifdef __WXWINE__
  57   #ifndef ListBox_SetItemData
  58     #define ListBox_SetItemData(hwndCtl, index, data) \
  59       ((int)(DWORD)SendMessage((hwndCtl), LB_SETITEMDATA, (WPARAM)(int)(index), (LPARAM)(data)))
  60   #endif
  61   #ifndef ListBox_GetHorizontalExtent
  62     #define ListBox_GetHorizontalExtent(hwndCtl) \
  63       ((int)(DWORD)SendMessage((hwndCtl), LB_GETHORIZONTALEXTENT, 0L, 0L))
  64   #endif
  65   #ifndef ListBox_GetSelCount
  66     #define ListBox_GetSelCount(hwndCtl) \
  67       ((int)(DWORD)SendMessage((hwndCtl), LB_GETSELCOUNT, 0L, 0L))
  68   #endif
  69   #ifndef ListBox_GetSelItems
  70     #define ListBox_GetSelItems(hwndCtl, cItems, lpItems) \
  71       ((int)(DWORD)SendMessage((hwndCtl), LB_GETSELITEMS, (WPARAM)(int)(cItems), (LPARAM)(int *)(lpItems)))
  72   #endif
  73   #ifndef ListBox_GetTextLen
  74     #define ListBox_GetTextLen(hwndCtl, index) \
  75       ((int)(DWORD)SendMessage((hwndCtl), LB_GETTEXTLEN, (WPARAM)(int)(index), 0L))
  76   #endif
  77   #ifndef ListBox_GetText
  78     #define ListBox_GetText(hwndCtl, index, lpszBuffer) \
  79       ((int)(DWORD)SendMessage((hwndCtl), LB_GETTEXT, (WPARAM)(int)(index), (LPARAM)(LPCTSTR)(lpszBuffer)))
  80   #endif
  81 #endif
  82
  83     IMPLEMENT_DYNAMIC_CLASS(wxListBox, wxControl)
  84
  85 // ============================================================================
  86 // list box item declaration and implementation
  87 // ============================================================================
  88
  89 #if wxUSE_OWNER_DRAWN
  90
  91 class wxListBoxItem : public wxOwnerDrawn
  92 {
  93 public:
  94     wxListBoxItem(const wxString& str = "");
  95 };
  96
  97 wxListBoxItem::wxListBoxItem(const wxString& str) : wxOwnerDrawn(str, FALSE)
  98 {
  99     // no bitmaps/checkmarks
 100     SetMarginWidth(0);
 101 }
 102
 103 wxOwnerDrawn *wxListBox::CreateItem(size_t n)
 104 {
 105     return new wxListBoxItem();
 106 }
 107
 108 #endif  //USE_OWNER_DRAWN
 109
 110 // ============================================================================
 111 // list box control implementation
 112 // ============================================================================
 113
 114 // ----------------------------------------------------------------------------
 115 // creation
 116 // ----------------------------------------------------------------------------
 117
 118 // Listbox item
 119 wxListBox::wxListBox()
 120 {
 121     m_noItems = 0;
 122     m_selected = 0;
 123 }
 124
 125 bool wxListBox::Create(wxWindow *parent,
 126                        wxWindowID id,
 127                        const wxPoint& pos,
 128                        const wxSize& size,
 129                        int n, const wxString choices[],
 130                        long style,
 131                        const wxValidator& validator,
 132                        const wxString& name)
 133 {
 134     m_noItems = 0;
 135     m_hWnd = 0;
 136     m_selected = 0;
 137
 138     SetName(name);
 139 #if wxUSE_VALIDATORS
 140     SetValidator(validator);
 141 #endif // wxUSE_VALIDATORS
 142
 143     if (parent)
 144         parent->AddChild(this);
 145
 146     wxSystemSettings settings;
 147     SetBackgroundColour(settings.GetSystemColour(wxSYS_COLOUR_WINDOW));
 148     SetForegroundColour(parent->GetForegroundColour());
 149
 150     m_windowId = ( id == -1 ) ? (int)NewControlId() : id;
 151
 152     int x = pos.x;
 153     int y = pos.y;
 154     int width = size.x;
 155     int height = size.y;
 156     m_windowStyle = style;
 157
 158     DWORD wstyle = WS_VISIBLE | WS_VSCROLL | WS_TABSTOP |
 159                    LBS_NOTIFY | LBS_HASSTRINGS /* | WS_CLIPSIBLINGS */;
 160
 161     wxASSERT_MSG( !(style & wxLB_MULTIPLE) || !(style & wxLB_EXTENDED),
 162                   _T("only one of listbox selection modes can be specified") );
 163
 164     if (m_windowStyle & wxLB_MULTIPLE)
 165         wstyle |= LBS_MULTIPLESEL;
 166     else if (m_windowStyle & wxLB_EXTENDED)
 167         wstyle |= LBS_EXTENDEDSEL;
 168
 169     if (m_windowStyle & wxLB_ALWAYS_SB)
 170         wstyle |= LBS_DISABLENOSCROLL;
 171     if (m_windowStyle & wxLB_HSCROLL)
 172         wstyle |= WS_HSCROLL;
 173     if (m_windowStyle & wxLB_SORT)
 174         wstyle |= LBS_SORT;
 175
 176 #if wxUSE_OWNER_DRAWN
 177     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 178         // we don't support LBS_OWNERDRAWVARIABLE yet
 179         wstyle |= LBS_OWNERDRAWFIXED;
 180     }
 181 #endif
 182
 183     // Without this style, you get unexpected heights, so e.g. constraint layout
 184     // doesn't work properly
 185     wstyle |= LBS_NOINTEGRALHEIGHT;
 186
 187     bool want3D;
 188     WXDWORD exStyle = Determine3DEffects(WS_EX_CLIENTEDGE, &want3D);
 189
 190     // Even with extended styles, need to combine with WS_BORDER for them to
 191     // look right.
 192     if ( want3D || wxStyleHasBorder(m_windowStyle) )
 193     {
 194         wstyle |= WS_BORDER;
 195     }
 196
 197     m_hWnd = (WXHWND)::CreateWindowEx(exStyle, wxT("LISTBOX"), NULL,
 198             wstyle | WS_CHILD,
 199             0, 0, 0, 0,
 200             (HWND)parent->GetHWND(), (HMENU)m_windowId,
 201             wxGetInstance(), NULL);
 202
 203     wxCHECK_MSG( m_hWnd, FALSE, wxT("Failed to create listbox") );
 204
 205 #if wxUSE_CTL3D
 206     if (want3D)
 207     {
 208         Ctl3dSubclassCtl(GetHwnd());
 209         m_useCtl3D = TRUE;
 210     }
 211 #endif
 212
 213     // Subclass again to catch messages
 214     SubclassWin(m_hWnd);
 215
 216     size_t ui;
 217     for (ui = 0; ui < (size_t)n; ui++) {
 218         Append(choices[ui]);
 219     }
 220
 221     if ( (m_windowStyle & wxLB_MULTIPLE) == 0 )
 222         SendMessage(GetHwnd(), LB_SETCURSEL, 0, 0);
 223
 224     SetFont(parent->GetFont());
 225
 226     SetSize(x, y, width, height);
 227
 228     return TRUE;
 229 }
 230
 231 wxListBox::~wxListBox()
 232 {
 233     Free();
 234 }
 235
 236 void wxListBox::SetupColours()
 237 {
 238     SetBackgroundColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_WINDOW));
 239     SetForegroundColour(GetParent()->GetForegroundColour());
 240 }
 241
 242 // ----------------------------------------------------------------------------
 243 // implementation of wxListBoxBase methods
 244 // ----------------------------------------------------------------------------
 245
 246 void wxListBox::DoSetFirstItem(int N)
 247 {
 248     wxCHECK_RET( N >= 0 && N < m_noItems,
 249                  wxT("invalid index in wxListBox::SetFirstItem") );
 250
 251     SendMessage(GetHwnd(), LB_SETTOPINDEX, (WPARAM)N, (LPARAM)0);
 252 }
 253
 254 void wxListBox::Delete(int N)
 255 {
 256     wxCHECK_RET( N >= 0 && N < m_noItems,
 257                  wxT("invalid index in wxListBox::Delete") );
 258
 259     // for owner drawn objects, the data is used for storing wxOwnerDrawn
 260     // pointers and we shouldn't touch it
 261 #if !wxUSE_OWNER_DRAWN
 262     if ( !(m_windowStyle & wxLB_OWNERDRAW) )
 263 #endif // !wxUSE_OWNER_DRAWN
 264         if ( HasClientObjectData() )
 265         {
 266             delete GetClientObject(N);
 267         }
 268
 269     SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);
 270     m_noItems--;
 271
 272     SetHorizontalExtent("");
 273 }
 274
 275 int wxListBox::DoAppend(const wxString& item)
 276 {
 277     int index = ListBox_AddString(GetHwnd(), item);
 278     m_noItems++;
 279
 280 #if wxUSE_OWNER_DRAWN
 281     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 282         wxOwnerDrawn *pNewItem = CreateItem(index); // dummy argument
 283         pNewItem->SetName(item);
 284         m_aItems.Add(pNewItem);
 285         ListBox_SetItemData(GetHwnd(), index, pNewItem);
 286         pNewItem->SetFont(GetFont());
 287     }
 288 #endif
 289
 290     SetHorizontalExtent(item);
 291
 292     return index;
 293 }
 294
 295 void wxListBox::DoSetItems(const wxArrayString& choices, void** clientData)
 296 {
 297     // avoid flicker - but don't need to do this for a hidden listbox
 298     bool hideAndShow = IsShown();
 299     if ( hideAndShow )
 300     {
 301         ShowWindow(GetHwnd(), SW_HIDE);
 302     }
 303
 304     ListBox_ResetContent(GetHwnd());
 305
 306     m_noItems = choices.GetCount();
 307     int i;
 308     for (i = 0; i < m_noItems; i++)
 309     {
 310         ListBox_AddString(GetHwnd(), choices[i]);
 311         if ( clientData )
 312         {
 313 #if wxUSE_OWNER_DRAWN
 314             if ( m_windowStyle & wxLB_OWNERDRAW )
 315             {
 316                 wxASSERT_MSG(clientData[i] == NULL,
 317                              wxT("Can't use client data with owner-drawn listboxes"));
 318             }
 319             ListBox_SetItemData(GetHwnd(), i, clientData[i]);
 320 #else // !wxUSE_OWNER_DRAWN
 321             ListBox_SetItemData(GetHwnd(), i, clientData[i]);
 322 #endif // wxUSE_OWNER_DRAWN/!wxUSE_OWNER_DRAWN
 323         }
 324     }
 325
 326 #if wxUSE_OWNER_DRAWN
 327     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 328         // first delete old items
 329         size_t ui = m_aItems.Count();
 330         while ( ui-- != 0 ) {
 331             delete m_aItems[ui];
 332         }
 333         m_aItems.Empty();
 334
 335         // then create new ones
 336         for ( ui = 0; ui < (size_t)m_noItems; ui++ ) {
 337             wxOwnerDrawn *pNewItem = CreateItem(ui);
 338             pNewItem->SetName(choices[ui]);
 339             m_aItems.Add(pNewItem);
 340             ListBox_SetItemData(GetHwnd(), ui, pNewItem);
 341         }
 342     }
 343 #endif // wxUSE_OWNER_DRAWN
 344
 345     SetHorizontalExtent();
 346
 347     if ( hideAndShow )
 348     {
 349         // show the listbox back if we hid it
 350         ShowWindow(GetHwnd(), SW_SHOW);
 351     }
 352 }
 353
 354 int wxListBox::FindString(const wxString& s) const
 355 {
 356     int pos = ListBox_FindStringExact(GetHwnd(), (WPARAM)-1, s);
 357     if (pos == LB_ERR)
 358         return wxNOT_FOUND;
 359     else
 360         return pos;
 361 }
 362
 363 void wxListBox::Clear()
 364 {
 365     Free();
 366
 367     ListBox_ResetContent(GetHwnd());
 368
 369     m_noItems = 0;
 370     SetHorizontalExtent();
 371 }
 372
 373 void wxListBox::Free()
 374 {
 375 #if wxUSE_OWNER_DRAWN
 376     if ( m_windowStyle & wxLB_OWNERDRAW )
 377     {
 378         size_t uiCount = m_aItems.Count();
 379         while ( uiCount-- != 0 ) {
 380             delete m_aItems[uiCount];
 381         }
 382
 383         m_aItems.Clear();
 384     }
 385     else
 386 #endif // wxUSE_OWNER_DRAWN
 387     if ( HasClientObjectData() )
 388     {
 389         for ( size_t n = 0; n < (size_t)m_noItems; n++ )
 390         {
 391             delete GetClientObject(n);
 392         }
 393     }
 394 }
 395
 396 void wxListBox::SetSelection(int N, bool select)
 397 {
 398     wxCHECK_RET( N >= 0 && N < m_noItems,
 399                  wxT("invalid index in wxListBox::SetSelection") );
 400
 401     if ( HasMultipleSelection() )
 402     {
 403         SendMessage(GetHwnd(), LB_SETSEL, select, N);
 404     }
 405     else
 406     {
 407         SendMessage(GetHwnd(), LB_SETCURSEL, select ? N : -1, 0);
 408     }
 409 }
 410
 411 bool wxListBox::IsSelected(int N) const
 412 {
 413     wxCHECK_MSG( N >= 0 && N < m_noItems, FALSE,
 414                  wxT("invalid index in wxListBox::Selected") );
 415
 416     return SendMessage(GetHwnd(), LB_GETSEL, N, 0) == 0 ? FALSE : TRUE;
 417 }
 418
 419 wxClientData* wxListBox::DoGetItemClientObject(int n) const
 420 {
 421     return (wxClientData *)DoGetItemClientData(n);
 422 }
 423
 424 void *wxListBox::DoGetItemClientData(int n) const
 425 {
 426     wxCHECK_MSG( n >= 0 && n < m_noItems, NULL,
 427                  wxT("invalid index in wxListBox::GetClientData") );
 428
 429     return (void *)SendMessage(GetHwnd(), LB_GETITEMDATA, n, 0);
 430 }
 431
 432 void wxListBox::DoSetItemClientObject(int n, wxClientData* clientData)
 433 {
 434     DoSetItemClientData(n, clientData);
 435 }
 436
 437 void wxListBox::DoSetItemClientData(int n, void *clientData)
 438 {
 439     wxCHECK_RET( n >= 0 && n < m_noItems,
 440                  wxT("invalid index in wxListBox::SetClientData") );
 441
 442 #if wxUSE_OWNER_DRAWN
 443     if ( m_windowStyle & wxLB_OWNERDRAW )
 444     {
 445         // client data must be pointer to wxOwnerDrawn, otherwise we would crash
 446         // in OnMeasure/OnDraw.
 447         wxFAIL_MSG(wxT("Can't use client data with owner-drawn listboxes"));
 448     }
 449 #endif // wxUSE_OWNER_DRAWN
 450
 451     if ( ListBox_SetItemData(GetHwnd(), n, clientData) == LB_ERR )
 452         wxLogDebug(wxT("LB_SETITEMDATA failed"));
 453 }
 454
 455 bool wxListBox::HasMultipleSelection() const
 456 {
 457     return (m_windowStyle & wxLB_MULTIPLE) || (m_windowStyle & wxLB_EXTENDED);
 458 }
 459
 460 // Return number of selections and an array of selected integers
 461 int wxListBox::GetSelections(wxArrayInt& aSelections) const
 462 {
 463     aSelections.Empty();
 464
 465     if ( HasMultipleSelection() )
 466     {
 467         int no_sel = ListBox_GetSelCount(GetHwnd());
 468         if (no_sel != 0) {
 469             int *selections = new int[no_sel];
 470             int rc = ListBox_GetSelItems(GetHwnd(), no_sel, selections);
 471
 472             wxCHECK_MSG(rc != LB_ERR, -1, wxT("ListBox_GetSelItems failed"));
 473
 474             aSelections.Alloc(no_sel);
 475             for ( int n = 0; n < no_sel; n++ )
 476                 aSelections.Add(selections[n]);
 477
 478             delete [] selections;
 479         }
 480
 481         return no_sel;
 482     }
 483     else  // single-selection listbox
 484     {
 485         if (ListBox_GetCurSel(GetHwnd()) > -1)
 486             aSelections.Add(ListBox_GetCurSel(GetHwnd()));
 487
 488         return aSelections.Count();
 489     }
 490 }
 491
 492 // Get single selection, for single choice list items
 493 int wxListBox::GetSelection() const
 494 {
 495     wxCHECK_MSG( !HasMultipleSelection(),
 496                  -1,
 497                  wxT("GetSelection() can't be used with multiple-selection listboxes, use GetSelections() instead.") );
 498
 499     return ListBox_GetCurSel(GetHwnd());
 500 }
 501
 502 // Find string for position
 503 wxString wxListBox::GetString(int N) const
 504 {
 505     wxCHECK_MSG( N >= 0 && N < m_noItems, "",
 506                  wxT("invalid index in wxListBox::GetClientData") );
 507
 508     int len = ListBox_GetTextLen(GetHwnd(), N);
 509
 510     // +1 for terminating NUL
 511     wxString result;
 512     ListBox_GetText(GetHwnd(), N, result.GetWriteBuf(len + 1));
 513     result.UngetWriteBuf();
 514
 515     return result;
 516 }
 517
 518 void
 519 wxListBox::DoInsertItems(const wxArrayString& items, int pos)
 520 {
 521     wxCHECK_RET( pos >= 0 && pos <= m_noItems,
 522                  wxT("invalid index in wxListBox::InsertItems") );
 523
 524     int nItems = items.GetCount();
 525     for ( int i = 0; i < nItems; i++ )
 526         ListBox_InsertString(GetHwnd(), i + pos, items[i]);
 527     m_noItems += nItems;
 528
 529     SetHorizontalExtent();
 530 }
 531
 532 void wxListBox::SetString(int N, const wxString& s)
 533 {
 534     wxCHECK_RET( N >= 0 && N < m_noItems,
 535                  wxT("invalid index in wxListBox::SetString") );
 536
 537     // remember the state of the item
 538     bool wasSelected = IsSelected(N);
 539
 540     void *oldData = NULL;
 541     wxClientData *oldObjData = NULL;
 542     if ( m_clientDataItemsType == ClientData_Void )
 543         oldData = GetClientData(N);
 544     else if ( m_clientDataItemsType == ClientData_Object )
 545         oldObjData = GetClientObject(N);
 546
 547     // delete and recreate it
 548     SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);
 549
 550     int newN = N;
 551     if ( N == m_noItems - 1 )
 552         newN = -1;
 553
 554     ListBox_InsertString(GetHwnd(), newN, s);
 555
 556     // restore the client data
 557     if ( oldData )
 558         SetClientData(N, oldData);
 559     else if ( oldObjData )
 560         SetClientObject(N, oldObjData);
 561
 562     // we may have lost the selection
 563     if ( wasSelected )
 564         Select(N);
 565
 566 #if wxUSE_OWNER_DRAWN
 567     if ( m_windowStyle & wxLB_OWNERDRAW )
 568         // update item's text
 569         m_aItems[N]->SetName(s);
 570 #endif  //USE_OWNER_DRAWN
 571 }
 572
 573 int wxListBox::GetCount() const
 574 {
 575     return m_noItems;
 576 }
 577
 578 // ----------------------------------------------------------------------------
 579 // helpers
 580 // ----------------------------------------------------------------------------
 581
 582 // Windows-specific code to set the horizontal extent of the listbox, if
 583 // necessary. If s is non-NULL, it's used to calculate the horizontal extent.
 584 // Otherwise, all strings are used.
 585 void wxListBox::SetHorizontalExtent(const wxString& s)
 586 {
 587     // Only necessary if we want a horizontal scrollbar
 588     if (!(m_windowStyle & wxHSCROLL))
 589         return;
 590     TEXTMETRIC lpTextMetric;
 591
 592     if ( !s.IsEmpty() )
 593     {
 594         int existingExtent = (int)SendMessage(GetHwnd(), LB_GETHORIZONTALEXTENT, 0, 0L);
 595         HDC dc = GetWindowDC(GetHwnd());
 596         HFONT oldFont = 0;
 597         if (GetFont().Ok() && GetFont().GetResourceHandle())
 598             oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
 599
 600         GetTextMetrics(dc, &lpTextMetric);
 601         SIZE extentXY;
 602         ::GetTextExtentPoint(dc, (LPTSTR) (const wxChar *)s, s.Length(), &extentXY);
 603         int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 604
 605         if (oldFont)
 606             ::SelectObject(dc, oldFont);
 607
 608         ReleaseDC(GetHwnd(), dc);
 609         if (extentX > existingExtent)
 610             SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(extentX), 0L);
 611     }
 612     else
 613     {
 614         int largestExtent = 0;
 615         HDC dc = GetWindowDC(GetHwnd());
 616         HFONT oldFont = 0;
 617         if (GetFont().Ok() && GetFont().GetResourceHandle())
 618             oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
 619
 620         GetTextMetrics(dc, &lpTextMetric);
 621         int i;
 622         for (i = 0; i < m_noItems; i++)
 623         {
 624             int len = (int)SendMessage(GetHwnd(), LB_GETTEXT, i, (LONG)wxBuffer);
 625             wxBuffer[len] = 0;
 626             SIZE extentXY;
 627             ::GetTextExtentPoint(dc, (LPTSTR)wxBuffer, len, &extentXY);
 628             int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 629             if (extentX > largestExtent)
 630                 largestExtent = extentX;
 631         }
 632         if (oldFont)
 633             ::SelectObject(dc, oldFont);
 634
 635         ReleaseDC(GetHwnd(), dc);
 636         SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(largestExtent), 0L);
 637     }
 638 }
 639
 640 wxSize wxListBox::DoGetBestSize() const
 641 {
 642     // find the widest string
 643     int wLine;
 644     int wListbox = 0;
 645     for ( int i = 0; i < m_noItems; i++ )
 646     {
 647         wxString str(GetString(i));
 648         GetTextExtent(str, &wLine, NULL);
 649         if ( wLine > wListbox )
 650             wListbox = wLine;
 651     }
 652
 653     // give it some reasonable default value if there are no strings in the
 654     // list
 655     if ( wListbox == 0 )
 656         wListbox = 100;
 657
 658     // the listbox should be slightly larger than the widest string
 659     int cx, cy;
 660     wxGetCharSize(GetHWND(), &cx, &cy, &GetFont());
 661
 662     wListbox += 3*cx;
 663
 664     int hListbox = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy)*(wxMax(m_noItems, 7));
 665
 666     return wxSize(wListbox, hListbox);
 667 }
 668
 669 // ----------------------------------------------------------------------------
 670 // callbacks
 671 // ----------------------------------------------------------------------------
 672
 673 bool wxListBox::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 674 {
 675     wxEventType evtType;
 676     if ( param == LBN_SELCHANGE )
 677     {
 678         evtType = wxEVT_COMMAND_LISTBOX_SELECTED;
 679     }
 680     else if ( param == LBN_DBLCLK )
 681     {
 682         evtType = wxEVT_COMMAND_LISTBOX_DOUBLECLICKED;
 683     }
 684     else
 685     {
 686         // some event we're not interested in
 687         return FALSE;
 688     }
 689
 690     wxCommandEvent event(evtType, m_windowId);
 691     event.SetEventObject( this );
 692
 693     wxArrayInt aSelections;
 694     int n, count = GetSelections(aSelections);
 695     if ( count > 0 )
 696     {
 697         n = aSelections[0];
 698         if ( HasClientObjectData() )
 699             event.SetClientObject( GetClientObject(n) );
 700         else if ( HasClientUntypedData() )
 701             event.SetClientData( GetClientData(n) );
 702         event.SetString( GetString(n) );
 703     }
 704     else
 705     {
 706         n = -1;
 707     }
 708
 709     event.m_commandInt = n;
 710
 711     return GetEventHandler()->ProcessEvent(event);
 712 }
 713
 714 // ----------------------------------------------------------------------------
 715 // wxCheckListBox support
 716 // ----------------------------------------------------------------------------
 717
 718 #if wxUSE_OWNER_DRAWN
 719
 720 // drawing
 721 // -------
 722
 723 // space beneath/above each row in pixels
 724 // "standard" checklistbox use 1 here, some might prefer 2. 0 is ugly.
 725 #define OWNER_DRAWN_LISTBOX_EXTRA_SPACE    (1)
 726
 727 // the height is the same for all items
 728 // TODO should be changed for LBS_OWNERDRAWVARIABLE style listboxes
 729
 730 // NB: can't forward this to wxListBoxItem because LB_SETITEMDATA
 731 //     message is not yet sent when we get here!
 732 bool wxListBox::MSWOnMeasure(WXMEASUREITEMSTRUCT *item)
 733 {
 734     // only owner-drawn control should receive this message
 735     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), FALSE );
 736
 737     MEASUREITEMSTRUCT *pStruct = (MEASUREITEMSTRUCT *)item;
 738
 739     HDC hdc = CreateIC(wxT("DISPLAY"), NULL, NULL, 0);
 740
 741     wxDC dc;
 742     dc.SetHDC((WXHDC)hdc);
 743     dc.SetFont(wxSystemSettings::GetSystemFont(wxSYS_ANSI_VAR_FONT));
 744
 745     pStruct->itemHeight = dc.GetCharHeight() + 2*OWNER_DRAWN_LISTBOX_EXTRA_SPACE;
 746     pStruct->itemWidth  = dc.GetCharWidth();
 747
 748     dc.SetHDC(0);
 749
 750     DeleteDC(hdc);
 751
 752     return TRUE;
 753 }
 754
 755 // forward the message to the appropriate item
 756 bool wxListBox::MSWOnDraw(WXDRAWITEMSTRUCT *item)
 757 {
 758     // only owner-drawn control should receive this message
 759     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), FALSE );
 760
 761     DRAWITEMSTRUCT *pStruct = (DRAWITEMSTRUCT *)item;
 762     UINT itemID = pStruct->itemID;
 763
 764     // the item may be -1 for an empty listbox
 765     if ( itemID == (UINT)-1 )
 766         return FALSE;
 767
 768     long data = ListBox_GetItemData(GetHwnd(), pStruct->itemID);
 769
 770     wxCHECK( data && (data != LB_ERR), FALSE );
 771
 772     wxListBoxItem *pItem = (wxListBoxItem *)data;
 773
 774     wxDC dc;
 775     dc.SetHDC((WXHDC)pStruct->hDC, FALSE);
 776     wxRect rect(wxPoint(pStruct->rcItem.left, pStruct->rcItem.top),
 777                 wxPoint(pStruct->rcItem.right, pStruct->rcItem.bottom));
 778
 779     return pItem->OnDrawItem(dc, rect,
 780             (wxOwnerDrawn::wxODAction)pStruct->itemAction,
 781             (wxOwnerDrawn::wxODStatus)pStruct->itemState);
 782 }
 783
 784 #endif
 785     // wxUSE_OWNER_DRAWN