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