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 WXUNUSED(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     if ( m_windowStyle & wxCLIP_SIBLINGS )
 164         wstyle |= WS_CLIPSIBLINGS;
 165
 166     if (m_windowStyle & wxLB_MULTIPLE)
 167         wstyle |= LBS_MULTIPLESEL;
 168     else if (m_windowStyle & wxLB_EXTENDED)
 169         wstyle |= LBS_EXTENDEDSEL;
 170
 171     if (m_windowStyle & wxLB_ALWAYS_SB)
 172         wstyle |= LBS_DISABLENOSCROLL;
 173     if (m_windowStyle & wxLB_HSCROLL)
 174         wstyle |= WS_HSCROLL;
 175     if (m_windowStyle & wxLB_SORT)
 176         wstyle |= LBS_SORT;
 177
 178 #if wxUSE_OWNER_DRAWN
 179     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 180         // we don't support LBS_OWNERDRAWVARIABLE yet
 181         wstyle |= LBS_OWNERDRAWFIXED;
 182     }
 183 #endif
 184
 185     // Without this style, you get unexpected heights, so e.g. constraint layout
 186     // doesn't work properly
 187     wstyle |= LBS_NOINTEGRALHEIGHT;
 188
 189     bool want3D;
 190     WXDWORD exStyle = Determine3DEffects(WS_EX_CLIENTEDGE, &want3D);
 191
 192     // Even with extended styles, need to combine with WS_BORDER for them to
 193     // look right.
 194     if ( want3D || wxStyleHasBorder(m_windowStyle) )
 195     {
 196         wstyle |= WS_BORDER;
 197     }
 198
 199     m_hWnd = (WXHWND)::CreateWindowEx(exStyle, wxT("LISTBOX"), NULL,
 200             wstyle | WS_CHILD,
 201             0, 0, 0, 0,
 202             (HWND)parent->GetHWND(), (HMENU)m_windowId,
 203             wxGetInstance(), NULL);
 204
 205     wxCHECK_MSG( m_hWnd, FALSE, wxT("Failed to create listbox") );
 206
 207 #if wxUSE_CTL3D
 208     if (want3D)
 209     {
 210         Ctl3dSubclassCtl(GetHwnd());
 211         m_useCtl3D = TRUE;
 212     }
 213 #endif
 214
 215     // Subclass again to catch messages
 216     SubclassWin(m_hWnd);
 217
 218     size_t ui;
 219     for (ui = 0; ui < (size_t)n; ui++) {
 220         Append(choices[ui]);
 221     }
 222
 223     if ( (m_windowStyle & wxLB_MULTIPLE) == 0 )
 224         SendMessage(GetHwnd(), LB_SETCURSEL, 0, 0);
 225
 226     SetFont(parent->GetFont());
 227
 228     SetSize(x, y, width, height);
 229
 230     return TRUE;
 231 }
 232
 233 wxListBox::~wxListBox()
 234 {
 235     Free();
 236 }
 237
 238 void wxListBox::SetupColours()
 239 {
 240     SetBackgroundColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_WINDOW));
 241     SetForegroundColour(GetParent()->GetForegroundColour());
 242 }
 243
 244 // ----------------------------------------------------------------------------
 245 // implementation of wxListBoxBase methods
 246 // ----------------------------------------------------------------------------
 247
 248 void wxListBox::DoSetFirstItem(int N)
 249 {
 250     wxCHECK_RET( N >= 0 && N < m_noItems,
 251                  wxT("invalid index in wxListBox::SetFirstItem") );
 252
 253     SendMessage(GetHwnd(), LB_SETTOPINDEX, (WPARAM)N, (LPARAM)0);
 254 }
 255
 256 void wxListBox::Delete(int N)
 257 {
 258     wxCHECK_RET( N >= 0 && N < m_noItems,
 259                  wxT("invalid index in wxListBox::Delete") );
 260
 261     // for owner drawn objects, the data is used for storing wxOwnerDrawn
 262     // pointers and we shouldn't touch it
 263 #if !wxUSE_OWNER_DRAWN
 264     if ( !(m_windowStyle & wxLB_OWNERDRAW) )
 265 #endif // !wxUSE_OWNER_DRAWN
 266         if ( HasClientObjectData() )
 267         {
 268             delete GetClientObject(N);
 269         }
 270
 271     SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);
 272     m_noItems--;
 273
 274     SetHorizontalExtent("");
 275 }
 276
 277 int wxListBox::DoAppend(const wxString& item)
 278 {
 279     int index = ListBox_AddString(GetHwnd(), item);
 280     m_noItems++;
 281
 282 #if wxUSE_OWNER_DRAWN
 283     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 284         wxOwnerDrawn *pNewItem = CreateItem(index); // dummy argument
 285         pNewItem->SetName(item);
 286         m_aItems.Add(pNewItem);
 287         ListBox_SetItemData(GetHwnd(), index, pNewItem);
 288         pNewItem->SetFont(GetFont());
 289     }
 290 #endif
 291
 292     SetHorizontalExtent(item);
 293
 294     return index;
 295 }
 296
 297 void wxListBox::DoSetItems(const wxArrayString& choices, void** clientData)
 298 {
 299     // avoid flicker - but don't need to do this for a hidden listbox
 300     bool hideAndShow = IsShown();
 301     if ( hideAndShow )
 302     {
 303         ShowWindow(GetHwnd(), SW_HIDE);
 304     }
 305
 306     ListBox_ResetContent(GetHwnd());
 307
 308     m_noItems = choices.GetCount();
 309     int i;
 310     for (i = 0; i < m_noItems; i++)
 311     {
 312         ListBox_AddString(GetHwnd(), choices[i]);
 313         if ( clientData )
 314         {
 315 #if wxUSE_OWNER_DRAWN
 316             if ( m_windowStyle & wxLB_OWNERDRAW )
 317             {
 318                 wxASSERT_MSG(clientData[i] == NULL,
 319                              wxT("Can't use client data with owner-drawn listboxes"));
 320             }
 321             ListBox_SetItemData(GetHwnd(), i, clientData[i]);
 322 #else // !wxUSE_OWNER_DRAWN
 323             ListBox_SetItemData(GetHwnd(), i, clientData[i]);
 324 #endif // wxUSE_OWNER_DRAWN/!wxUSE_OWNER_DRAWN
 325         }
 326     }
 327
 328 #if wxUSE_OWNER_DRAWN
 329     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 330         // first delete old items
 331         size_t ui = m_aItems.Count();
 332         while ( ui-- != 0 ) {
 333             delete m_aItems[ui];
 334         }
 335         m_aItems.Empty();
 336
 337         // then create new ones
 338         for ( ui = 0; ui < (size_t)m_noItems; ui++ ) {
 339             wxOwnerDrawn *pNewItem = CreateItem(ui);
 340             pNewItem->SetName(choices[ui]);
 341             m_aItems.Add(pNewItem);
 342             ListBox_SetItemData(GetHwnd(), ui, pNewItem);
 343         }
 344     }
 345 #endif // wxUSE_OWNER_DRAWN
 346
 347     SetHorizontalExtent();
 348
 349     if ( hideAndShow )
 350     {
 351         // show the listbox back if we hid it
 352         ShowWindow(GetHwnd(), SW_SHOW);
 353     }
 354 }
 355
 356 int wxListBox::FindString(const wxString& s) const
 357 {
 358     int pos = ListBox_FindStringExact(GetHwnd(), (WPARAM)-1, s);
 359     if (pos == LB_ERR)
 360         return wxNOT_FOUND;
 361     else
 362         return pos;
 363 }
 364
 365 void wxListBox::Clear()
 366 {
 367     Free();
 368
 369     ListBox_ResetContent(GetHwnd());
 370
 371     m_noItems = 0;
 372     SetHorizontalExtent();
 373 }
 374
 375 void wxListBox::Free()
 376 {
 377 #if wxUSE_OWNER_DRAWN
 378     if ( m_windowStyle & wxLB_OWNERDRAW )
 379     {
 380         size_t uiCount = m_aItems.Count();
 381         while ( uiCount-- != 0 ) {
 382             delete m_aItems[uiCount];
 383         }
 384
 385         m_aItems.Clear();
 386     }
 387     else
 388 #endif // wxUSE_OWNER_DRAWN
 389     if ( HasClientObjectData() )
 390     {
 391         for ( size_t n = 0; n < (size_t)m_noItems; n++ )
 392         {
 393             delete GetClientObject(n);
 394         }
 395     }
 396 }
 397
 398 void wxListBox::SetSelection(int N, bool select)
 399 {
 400     wxCHECK_RET( N >= 0 && N < m_noItems,
 401                  wxT("invalid index in wxListBox::SetSelection") );
 402
 403     if ( HasMultipleSelection() )
 404     {
 405         SendMessage(GetHwnd(), LB_SETSEL, select, N);
 406     }
 407     else
 408     {
 409         SendMessage(GetHwnd(), LB_SETCURSEL, select ? N : -1, 0);
 410     }
 411 }
 412
 413 bool wxListBox::IsSelected(int N) const
 414 {
 415     wxCHECK_MSG( N >= 0 && N < m_noItems, FALSE,
 416                  wxT("invalid index in wxListBox::Selected") );
 417
 418     return SendMessage(GetHwnd(), LB_GETSEL, N, 0) == 0 ? FALSE : TRUE;
 419 }
 420
 421 wxClientData* wxListBox::DoGetItemClientObject(int n) const
 422 {
 423     return (wxClientData *)DoGetItemClientData(n);
 424 }
 425
 426 void *wxListBox::DoGetItemClientData(int n) const
 427 {
 428     wxCHECK_MSG( n >= 0 && n < m_noItems, NULL,
 429                  wxT("invalid index in wxListBox::GetClientData") );
 430
 431     return (void *)SendMessage(GetHwnd(), LB_GETITEMDATA, n, 0);
 432 }
 433
 434 void wxListBox::DoSetItemClientObject(int n, wxClientData* clientData)
 435 {
 436     DoSetItemClientData(n, clientData);
 437 }
 438
 439 void wxListBox::DoSetItemClientData(int n, void *clientData)
 440 {
 441     wxCHECK_RET( n >= 0 && n < m_noItems,
 442                  wxT("invalid index in wxListBox::SetClientData") );
 443
 444 #if wxUSE_OWNER_DRAWN
 445     if ( m_windowStyle & wxLB_OWNERDRAW )
 446     {
 447         // client data must be pointer to wxOwnerDrawn, otherwise we would crash
 448         // in OnMeasure/OnDraw.
 449         wxFAIL_MSG(wxT("Can't use client data with owner-drawn listboxes"));
 450     }
 451 #endif // wxUSE_OWNER_DRAWN
 452
 453     if ( ListBox_SetItemData(GetHwnd(), n, clientData) == LB_ERR )
 454         wxLogDebug(wxT("LB_SETITEMDATA failed"));
 455 }
 456
 457 bool wxListBox::HasMultipleSelection() const
 458 {
 459     return (m_windowStyle & wxLB_MULTIPLE) || (m_windowStyle & wxLB_EXTENDED);
 460 }
 461
 462 // Return number of selections and an array of selected integers
 463 int wxListBox::GetSelections(wxArrayInt& aSelections) const
 464 {
 465     aSelections.Empty();
 466
 467     if ( HasMultipleSelection() )
 468     {
 469         int no_sel = ListBox_GetSelCount(GetHwnd());
 470         if (no_sel != 0) {
 471             int *selections = new int[no_sel];
 472             int rc = ListBox_GetSelItems(GetHwnd(), no_sel, selections);
 473
 474             wxCHECK_MSG(rc != LB_ERR, -1, wxT("ListBox_GetSelItems failed"));
 475
 476             aSelections.Alloc(no_sel);
 477             for ( int n = 0; n < no_sel; n++ )
 478                 aSelections.Add(selections[n]);
 479
 480             delete [] selections;
 481         }
 482
 483         return no_sel;
 484     }
 485     else  // single-selection listbox
 486     {
 487         if (ListBox_GetCurSel(GetHwnd()) > -1)
 488             aSelections.Add(ListBox_GetCurSel(GetHwnd()));
 489
 490         return aSelections.Count();
 491     }
 492 }
 493
 494 // Get single selection, for single choice list items
 495 int wxListBox::GetSelection() const
 496 {
 497     wxCHECK_MSG( !HasMultipleSelection(),
 498                  -1,
 499                  wxT("GetSelection() can't be used with multiple-selection listboxes, use GetSelections() instead.") );
 500
 501     return ListBox_GetCurSel(GetHwnd());
 502 }
 503
 504 // Find string for position
 505 wxString wxListBox::GetString(int N) const
 506 {
 507     wxCHECK_MSG( N >= 0 && N < m_noItems, "",
 508                  wxT("invalid index in wxListBox::GetClientData") );
 509
 510     int len = ListBox_GetTextLen(GetHwnd(), N);
 511
 512     // +1 for terminating NUL
 513     wxString result;
 514     ListBox_GetText(GetHwnd(), N, result.GetWriteBuf(len + 1));
 515     result.UngetWriteBuf();
 516
 517     return result;
 518 }
 519
 520 void
 521 wxListBox::DoInsertItems(const wxArrayString& items, int pos)
 522 {
 523     wxCHECK_RET( pos >= 0 && pos <= m_noItems,
 524                  wxT("invalid index in wxListBox::InsertItems") );
 525
 526     int nItems = items.GetCount();
 527     for ( int i = 0; i < nItems; i++ )
 528         ListBox_InsertString(GetHwnd(), i + pos, items[i]);
 529     m_noItems += nItems;
 530
 531     SetHorizontalExtent();
 532 }
 533
 534 void wxListBox::SetString(int N, const wxString& s)
 535 {
 536     wxCHECK_RET( N >= 0 && N < m_noItems,
 537                  wxT("invalid index in wxListBox::SetString") );
 538
 539     // remember the state of the item
 540     bool wasSelected = IsSelected(N);
 541
 542     void *oldData = NULL;
 543     wxClientData *oldObjData = NULL;
 544     if ( m_clientDataItemsType == ClientData_Void )
 545         oldData = GetClientData(N);
 546     else if ( m_clientDataItemsType == ClientData_Object )
 547         oldObjData = GetClientObject(N);
 548
 549     // delete and recreate it
 550     SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);
 551
 552     int newN = N;
 553     if ( N == m_noItems - 1 )
 554         newN = -1;
 555
 556     ListBox_InsertString(GetHwnd(), newN, s);
 557
 558     // restore the client data
 559     if ( oldData )
 560         SetClientData(N, oldData);
 561     else if ( oldObjData )
 562         SetClientObject(N, oldObjData);
 563
 564     // we may have lost the selection
 565     if ( wasSelected )
 566         Select(N);
 567
 568 #if wxUSE_OWNER_DRAWN
 569     if ( m_windowStyle & wxLB_OWNERDRAW )
 570         // update item's text
 571         m_aItems[N]->SetName(s);
 572 #endif  //USE_OWNER_DRAWN
 573 }
 574
 575 int wxListBox::GetCount() const
 576 {
 577     return m_noItems;
 578 }
 579
 580 // ----------------------------------------------------------------------------
 581 // helpers
 582 // ----------------------------------------------------------------------------
 583
 584 // Windows-specific code to set the horizontal extent of the listbox, if
 585 // necessary. If s is non-NULL, it's used to calculate the horizontal extent.
 586 // Otherwise, all strings are used.
 587 void wxListBox::SetHorizontalExtent(const wxString& s)
 588 {
 589     // Only necessary if we want a horizontal scrollbar
 590     if (!(m_windowStyle & wxHSCROLL))
 591         return;
 592     TEXTMETRIC lpTextMetric;
 593
 594     if ( !s.IsEmpty() )
 595     {
 596         int existingExtent = (int)SendMessage(GetHwnd(), LB_GETHORIZONTALEXTENT, 0, 0L);
 597         HDC dc = GetWindowDC(GetHwnd());
 598         HFONT oldFont = 0;
 599         if (GetFont().Ok() && GetFont().GetResourceHandle())
 600             oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
 601
 602         GetTextMetrics(dc, &lpTextMetric);
 603         SIZE extentXY;
 604         ::GetTextExtentPoint(dc, (LPTSTR) (const wxChar *)s, s.Length(), &extentXY);
 605         int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 606
 607         if (oldFont)
 608             ::SelectObject(dc, oldFont);
 609
 610         ReleaseDC(GetHwnd(), dc);
 611         if (extentX > existingExtent)
 612             SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(extentX), 0L);
 613     }
 614     else
 615     {
 616         int largestExtent = 0;
 617         HDC dc = GetWindowDC(GetHwnd());
 618         HFONT oldFont = 0;
 619         if (GetFont().Ok() && GetFont().GetResourceHandle())
 620             oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
 621
 622         GetTextMetrics(dc, &lpTextMetric);
 623         int i;
 624         for (i = 0; i < m_noItems; i++)
 625         {
 626             int len = (int)SendMessage(GetHwnd(), LB_GETTEXT, i, (LONG)wxBuffer);
 627             wxBuffer[len] = 0;
 628             SIZE extentXY;
 629             ::GetTextExtentPoint(dc, (LPTSTR)wxBuffer, len, &extentXY);
 630             int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 631             if (extentX > largestExtent)
 632                 largestExtent = extentX;
 633         }
 634         if (oldFont)
 635             ::SelectObject(dc, oldFont);
 636
 637         ReleaseDC(GetHwnd(), dc);
 638         SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(largestExtent), 0L);
 639     }
 640 }
 641
 642 wxSize wxListBox::DoGetBestSize() const
 643 {
 644     // find the widest string
 645     int wLine;
 646     int wListbox = 0;
 647     for ( int i = 0; i < m_noItems; i++ )
 648     {
 649         wxString str(GetString(i));
 650         GetTextExtent(str, &wLine, NULL);
 651         if ( wLine > wListbox )
 652             wListbox = wLine;
 653     }
 654
 655     // give it some reasonable default value if there are no strings in the
 656     // list
 657     if ( wListbox == 0 )
 658         wListbox = 100;
 659
 660     // the listbox should be slightly larger than the widest string
 661     int cx, cy;
 662     wxGetCharSize(GetHWND(), &cx, &cy, &GetFont());
 663
 664     wListbox += 3*cx;
 665
 666     // don't make the listbox too tall (limit height to 10 items) but don't
 667     // make it too small neither
 668     int hListbox = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy)*
 669                     wxMin(wxMax(m_noItems, 3), 10);
 670
 671     return wxSize(wListbox, hListbox);
 672 }
 673
 674 // ----------------------------------------------------------------------------
 675 // callbacks
 676 // ----------------------------------------------------------------------------
 677
 678 bool wxListBox::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 679 {
 680     wxEventType evtType;
 681     if ( param == LBN_SELCHANGE )
 682     {
 683         evtType = wxEVT_COMMAND_LISTBOX_SELECTED;
 684     }
 685     else if ( param == LBN_DBLCLK )
 686     {
 687         evtType = wxEVT_COMMAND_LISTBOX_DOUBLECLICKED;
 688     }
 689     else
 690     {
 691         // some event we're not interested in
 692         return FALSE;
 693     }
 694
 695     wxCommandEvent event(evtType, m_windowId);
 696     event.SetEventObject( this );
 697
 698     wxArrayInt aSelections;
 699     int n, count = GetSelections(aSelections);
 700     if ( count > 0 )
 701     {
 702         n = aSelections[0];
 703         if ( HasClientObjectData() )
 704             event.SetClientObject( GetClientObject(n) );
 705         else if ( HasClientUntypedData() )
 706             event.SetClientData( GetClientData(n) );
 707         event.SetString( GetString(n) );
 708     }
 709     else
 710     {
 711         n = -1;
 712     }
 713
 714     event.m_commandInt = n;
 715
 716     return GetEventHandler()->ProcessEvent(event);
 717 }
 718
 719 // ----------------------------------------------------------------------------
 720 // wxCheckListBox support
 721 // ----------------------------------------------------------------------------
 722
 723 #if wxUSE_OWNER_DRAWN
 724
 725 // drawing
 726 // -------
 727
 728 // space beneath/above each row in pixels
 729 // "standard" checklistbox use 1 here, some might prefer 2. 0 is ugly.
 730 #define OWNER_DRAWN_LISTBOX_EXTRA_SPACE    (1)
 731
 732 // the height is the same for all items
 733 // TODO should be changed for LBS_OWNERDRAWVARIABLE style listboxes
 734
 735 // NB: can't forward this to wxListBoxItem because LB_SETITEMDATA
 736 //     message is not yet sent when we get here!
 737 bool wxListBox::MSWOnMeasure(WXMEASUREITEMSTRUCT *item)
 738 {
 739     // only owner-drawn control should receive this message
 740     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), FALSE );
 741
 742     MEASUREITEMSTRUCT *pStruct = (MEASUREITEMSTRUCT *)item;
 743
 744     HDC hdc = CreateIC(wxT("DISPLAY"), NULL, NULL, 0);
 745
 746     wxDC dc;
 747     dc.SetHDC((WXHDC)hdc);
 748     dc.SetFont(wxSystemSettings::GetSystemFont(wxSYS_ANSI_VAR_FONT));
 749
 750     pStruct->itemHeight = dc.GetCharHeight() + 2*OWNER_DRAWN_LISTBOX_EXTRA_SPACE;
 751     pStruct->itemWidth  = dc.GetCharWidth();
 752
 753     dc.SetHDC(0);
 754
 755     DeleteDC(hdc);
 756
 757     return TRUE;
 758 }
 759
 760 // forward the message to the appropriate item
 761 bool wxListBox::MSWOnDraw(WXDRAWITEMSTRUCT *item)
 762 {
 763     // only owner-drawn control should receive this message
 764     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), FALSE );
 765
 766     DRAWITEMSTRUCT *pStruct = (DRAWITEMSTRUCT *)item;
 767     UINT itemID = pStruct->itemID;
 768
 769     // the item may be -1 for an empty listbox
 770     if ( itemID == (UINT)-1 )
 771         return FALSE;
 772
 773     long data = ListBox_GetItemData(GetHwnd(), pStruct->itemID);
 774
 775     wxCHECK( data && (data != LB_ERR), FALSE );
 776
 777     wxListBoxItem *pItem = (wxListBoxItem *)data;
 778
 779     wxDCTemp dc((WXHDC)pStruct->hDC);
 780     wxRect rect(wxPoint(pStruct->rcItem.left, pStruct->rcItem.top),
 781                 wxPoint(pStruct->rcItem.right, pStruct->rcItem.bottom));
 782
 783     return pItem->OnDrawItem(dc, rect,
 784                              (wxOwnerDrawn::wxODAction)pStruct->itemAction,
 785                              (wxOwnerDrawn::wxODStatus)pStruct->itemState);
 786 }
 787
 788 #endif
 789     // wxUSE_OWNER_DRAWN