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 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 #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 #ifdef __WXWINE__
  40   #if defined(GetWindowStyle)
  41     #undef GetWindowStyle
  42   #endif
  43 #endif
  44
  45 #include "wx/dynarray.h"
  46 #include "wx/log.h"
  47
  48 #if wxUSE_OWNER_DRAWN
  49     #include  "wx/ownerdrw.h"
  50 #endif
  51
  52 #ifndef __TWIN32__
  53     #ifdef __GNUWIN32_OLD__
  54         #include "wx/msw/gnuwin32/extra.h"
  55     #endif
  56 #endif
  57
  58 #ifdef __WXWINE__
  59   #ifndef ListBox_SetItemData
  60     #define ListBox_SetItemData(hwndCtl, index, data) \
  61       ((int)(DWORD)SendMessage((hwndCtl), LB_SETITEMDATA, (WPARAM)(int)(index), (LPARAM)(data)))
  62   #endif
  63   #ifndef ListBox_GetHorizontalExtent
  64     #define ListBox_GetHorizontalExtent(hwndCtl) \
  65       ((int)(DWORD)SendMessage((hwndCtl), LB_GETHORIZONTALEXTENT, 0L, 0L))
  66   #endif
  67   #ifndef ListBox_GetSelCount
  68     #define ListBox_GetSelCount(hwndCtl) \
  69       ((int)(DWORD)SendMessage((hwndCtl), LB_GETSELCOUNT, 0L, 0L))
  70   #endif
  71   #ifndef ListBox_GetSelItems
  72     #define ListBox_GetSelItems(hwndCtl, cItems, lpItems) \
  73       ((int)(DWORD)SendMessage((hwndCtl), LB_GETSELITEMS, (WPARAM)(int)(cItems), (LPARAM)(int *)(lpItems)))
  74   #endif
  75   #ifndef ListBox_GetTextLen
  76     #define ListBox_GetTextLen(hwndCtl, index) \
  77       ((int)(DWORD)SendMessage((hwndCtl), LB_GETTEXTLEN, (WPARAM)(int)(index), 0L))
  78   #endif
  79   #ifndef ListBox_GetText
  80     #define ListBox_GetText(hwndCtl, index, lpszBuffer) \
  81       ((int)(DWORD)SendMessage((hwndCtl), LB_GETTEXT, (WPARAM)(int)(index), (LPARAM)(LPCTSTR)(lpszBuffer)))
  82   #endif
  83 #endif
  84
  85     IMPLEMENT_DYNAMIC_CLASS(wxListBox, wxControl)
  86
  87 // ============================================================================
  88 // list box item declaration and implementation
  89 // ============================================================================
  90
  91 #if wxUSE_OWNER_DRAWN
  92
  93 class wxListBoxItem : public wxOwnerDrawn
  94 {
  95 public:
  96     wxListBoxItem(const wxString& str = "");
  97 };
  98
  99 wxListBoxItem::wxListBoxItem(const wxString& str) : wxOwnerDrawn(str, FALSE)
 100 {
 101     // no bitmaps/checkmarks
 102     SetMarginWidth(0);
 103 }
 104
 105 wxOwnerDrawn *wxListBox::CreateItem(size_t WXUNUSED(n))
 106 {
 107     return new wxListBoxItem();
 108 }
 109
 110 #endif  //USE_OWNER_DRAWN
 111
 112 // ============================================================================
 113 // list box control implementation
 114 // ============================================================================
 115
 116 // ----------------------------------------------------------------------------
 117 // creation
 118 // ----------------------------------------------------------------------------
 119
 120 // Listbox item
 121 wxListBox::wxListBox()
 122 {
 123     m_noItems = 0;
 124     m_selected = 0;
 125 }
 126
 127 bool wxListBox::Create(wxWindow *parent,
 128                        wxWindowID id,
 129                        const wxPoint& pos,
 130                        const wxSize& size,
 131                        int n, const wxString choices[],
 132                        long style,
 133                        const wxValidator& validator,
 134                        const wxString& name)
 135 {
 136     m_noItems = 0;
 137     m_hWnd = 0;
 138     m_selected = 0;
 139
 140     SetName(name);
 141 #if wxUSE_VALIDATORS
 142     SetValidator(validator);
 143 #endif // wxUSE_VALIDATORS
 144
 145     if (parent)
 146         parent->AddChild(this);
 147
 148     wxSystemSettings settings;
 149     SetBackgroundColour(settings.GetSystemColour(wxSYS_COLOUR_WINDOW));
 150     SetForegroundColour(parent->GetForegroundColour());
 151
 152     m_windowId = ( id == -1 ) ? (int)NewControlId() : id;
 153
 154     int x = pos.x;
 155     int y = pos.y;
 156     int width = size.x;
 157     int height = size.y;
 158     m_windowStyle = style;
 159
 160     DWORD wstyle = WS_VISIBLE | WS_VSCROLL | WS_TABSTOP |
 161                    LBS_NOTIFY | LBS_HASSTRINGS /* | WS_CLIPSIBLINGS */;
 162
 163     wxASSERT_MSG( !(style & wxLB_MULTIPLE) || !(style & wxLB_EXTENDED),
 164                   _T("only one of listbox selection modes can be specified") );
 165     if ( m_windowStyle & wxCLIP_SIBLINGS )
 166         wstyle |= WS_CLIPSIBLINGS;
 167
 168     if (m_windowStyle & wxLB_MULTIPLE)
 169         wstyle |= LBS_MULTIPLESEL;
 170     else if (m_windowStyle & wxLB_EXTENDED)
 171         wstyle |= LBS_EXTENDEDSEL;
 172
 173     if (m_windowStyle & wxLB_ALWAYS_SB)
 174         wstyle |= LBS_DISABLENOSCROLL;
 175     if (m_windowStyle & wxLB_HSCROLL)
 176         wstyle |= WS_HSCROLL;
 177     if (m_windowStyle & wxLB_SORT)
 178         wstyle |= LBS_SORT;
 179
 180 #if wxUSE_OWNER_DRAWN
 181     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 182         // we don't support LBS_OWNERDRAWVARIABLE yet
 183         wstyle |= LBS_OWNERDRAWFIXED;
 184     }
 185 #endif
 186
 187     // Without this style, you get unexpected heights, so e.g. constraint layout
 188     // doesn't work properly
 189     wstyle |= LBS_NOINTEGRALHEIGHT;
 190
 191     bool want3D;
 192     WXDWORD exStyle = Determine3DEffects(WS_EX_CLIENTEDGE, &want3D);
 193
 194     // Even with extended styles, need to combine with WS_BORDER for them to
 195     // look right.
 196     if ( want3D || wxStyleHasBorder(m_windowStyle) )
 197     {
 198         wstyle |= WS_BORDER;
 199     }
 200
 201     m_hWnd = (WXHWND)::CreateWindowEx(exStyle, wxT("LISTBOX"), NULL,
 202             wstyle | WS_CHILD,
 203             0, 0, 0, 0,
 204             (HWND)parent->GetHWND(), (HMENU)m_windowId,
 205             wxGetInstance(), NULL);
 206
 207     wxCHECK_MSG( m_hWnd, FALSE, wxT("Failed to create listbox") );
 208
 209 #if wxUSE_CTL3D
 210     if (want3D)
 211     {
 212         Ctl3dSubclassCtl(GetHwnd());
 213         m_useCtl3D = TRUE;
 214     }
 215 #endif
 216
 217     // Subclass again to catch messages
 218     SubclassWin(m_hWnd);
 219
 220     size_t ui;
 221     for (ui = 0; ui < (size_t)n; ui++) {
 222         Append(choices[ui]);
 223     }
 224
 225     if ( (m_windowStyle & wxLB_MULTIPLE) == 0 )
 226         SendMessage(GetHwnd(), LB_SETCURSEL, 0, 0);
 227
 228     SetFont(parent->GetFont());
 229
 230     SetSize(x, y, width, height);
 231
 232     return TRUE;
 233 }
 234
 235 wxListBox::~wxListBox()
 236 {
 237     Free();
 238 }
 239
 240 void wxListBox::SetupColours()
 241 {
 242     SetBackgroundColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_WINDOW));
 243     SetForegroundColour(GetParent()->GetForegroundColour());
 244 }
 245
 246 // ----------------------------------------------------------------------------
 247 // implementation of wxListBoxBase methods
 248 // ----------------------------------------------------------------------------
 249
 250 void wxListBox::DoSetFirstItem(int N)
 251 {
 252     wxCHECK_RET( N >= 0 && N < m_noItems,
 253                  wxT("invalid index in wxListBox::SetFirstItem") );
 254
 255     SendMessage(GetHwnd(), LB_SETTOPINDEX, (WPARAM)N, (LPARAM)0);
 256 }
 257
 258 void wxListBox::Delete(int N)
 259 {
 260     wxCHECK_RET( N >= 0 && N < m_noItems,
 261                  wxT("invalid index in wxListBox::Delete") );
 262
 263     // for owner drawn objects, the data is used for storing wxOwnerDrawn
 264     // pointers and we shouldn't touch it
 265 #if !wxUSE_OWNER_DRAWN
 266     if ( !(m_windowStyle & wxLB_OWNERDRAW) )
 267 #endif // !wxUSE_OWNER_DRAWN
 268         if ( HasClientObjectData() )
 269         {
 270             delete GetClientObject(N);
 271         }
 272
 273     SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);
 274     m_noItems--;
 275
 276     SetHorizontalExtent("");
 277 }
 278
 279 int wxListBox::DoAppend(const wxString& item)
 280 {
 281     int index = ListBox_AddString(GetHwnd(), item);
 282     m_noItems++;
 283
 284 #if wxUSE_OWNER_DRAWN
 285     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 286         wxOwnerDrawn *pNewItem = CreateItem(index); // dummy argument
 287         pNewItem->SetName(item);
 288         m_aItems.Add(pNewItem);
 289         ListBox_SetItemData(GetHwnd(), index, pNewItem);
 290         pNewItem->SetFont(GetFont());
 291     }
 292 #endif
 293
 294     SetHorizontalExtent(item);
 295
 296     return index;
 297 }
 298
 299 void wxListBox::DoSetItems(const wxArrayString& choices, void** clientData)
 300 {
 301     // avoid flicker - but don't need to do this for a hidden listbox
 302     bool hideAndShow = IsShown();
 303     if ( hideAndShow )
 304     {
 305         ShowWindow(GetHwnd(), SW_HIDE);
 306     }
 307
 308     ListBox_ResetContent(GetHwnd());
 309
 310     m_noItems = choices.GetCount();
 311     int i;
 312     for (i = 0; i < m_noItems; i++)
 313     {
 314         ListBox_AddString(GetHwnd(), choices[i]);
 315         if ( clientData )
 316         {
 317 #if wxUSE_OWNER_DRAWN
 318             if ( m_windowStyle & wxLB_OWNERDRAW )
 319             {
 320                 wxASSERT_MSG(clientData[i] == NULL,
 321                              wxT("Can't use client data with owner-drawn listboxes"));
 322             }
 323             ListBox_SetItemData(GetHwnd(), i, clientData[i]);
 324 #else // !wxUSE_OWNER_DRAWN
 325             ListBox_SetItemData(GetHwnd(), i, clientData[i]);
 326 #endif // wxUSE_OWNER_DRAWN/!wxUSE_OWNER_DRAWN
 327         }
 328     }
 329
 330 #if wxUSE_OWNER_DRAWN
 331     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 332         // first delete old items
 333         size_t ui = m_aItems.Count();
 334         while ( ui-- != 0 ) {
 335             delete m_aItems[ui];
 336         }
 337         m_aItems.Empty();
 338
 339         // then create new ones
 340         for ( ui = 0; ui < (size_t)m_noItems; ui++ ) {
 341             wxOwnerDrawn *pNewItem = CreateItem(ui);
 342             pNewItem->SetName(choices[ui]);
 343             m_aItems.Add(pNewItem);
 344             ListBox_SetItemData(GetHwnd(), ui, pNewItem);
 345         }
 346     }
 347 #endif // wxUSE_OWNER_DRAWN
 348
 349     SetHorizontalExtent();
 350
 351     if ( hideAndShow )
 352     {
 353         // show the listbox back if we hid it
 354         ShowWindow(GetHwnd(), SW_SHOW);
 355     }
 356 }
 357
 358 int wxListBox::FindString(const wxString& s) const
 359 {
 360     int pos = ListBox_FindStringExact(GetHwnd(), (WPARAM)-1, s);
 361     if (pos == LB_ERR)
 362         return wxNOT_FOUND;
 363     else
 364         return pos;
 365 }
 366
 367 void wxListBox::Clear()
 368 {
 369     Free();
 370
 371     ListBox_ResetContent(GetHwnd());
 372
 373     m_noItems = 0;
 374     SetHorizontalExtent();
 375 }
 376
 377 void wxListBox::Free()
 378 {
 379 #if wxUSE_OWNER_DRAWN
 380     if ( m_windowStyle & wxLB_OWNERDRAW )
 381     {
 382         size_t uiCount = m_aItems.Count();
 383         while ( uiCount-- != 0 ) {
 384             delete m_aItems[uiCount];
 385         }
 386
 387         m_aItems.Clear();
 388     }
 389     else
 390 #endif // wxUSE_OWNER_DRAWN
 391     if ( HasClientObjectData() )
 392     {
 393         for ( size_t n = 0; n < (size_t)m_noItems; n++ )
 394         {
 395             delete GetClientObject(n);
 396         }
 397     }
 398 }
 399
 400 void wxListBox::SetSelection(int N, bool select)
 401 {
 402     wxCHECK_RET( N >= 0 && N < m_noItems,
 403                  wxT("invalid index in wxListBox::SetSelection") );
 404
 405     if ( HasMultipleSelection() )
 406     {
 407         SendMessage(GetHwnd(), LB_SETSEL, select, N);
 408     }
 409     else
 410     {
 411         SendMessage(GetHwnd(), LB_SETCURSEL, select ? N : -1, 0);
 412     }
 413 }
 414
 415 bool wxListBox::IsSelected(int N) const
 416 {
 417     wxCHECK_MSG( N >= 0 && N < m_noItems, FALSE,
 418                  wxT("invalid index in wxListBox::Selected") );
 419
 420     return SendMessage(GetHwnd(), LB_GETSEL, N, 0) == 0 ? FALSE : TRUE;
 421 }
 422
 423 wxClientData* wxListBox::DoGetItemClientObject(int n) const
 424 {
 425     return (wxClientData *)DoGetItemClientData(n);
 426 }
 427
 428 void *wxListBox::DoGetItemClientData(int n) const
 429 {
 430     wxCHECK_MSG( n >= 0 && n < m_noItems, NULL,
 431                  wxT("invalid index in wxListBox::GetClientData") );
 432
 433     return (void *)SendMessage(GetHwnd(), LB_GETITEMDATA, n, 0);
 434 }
 435
 436 void wxListBox::DoSetItemClientObject(int n, wxClientData* clientData)
 437 {
 438     DoSetItemClientData(n, clientData);
 439 }
 440
 441 void wxListBox::DoSetItemClientData(int n, void *clientData)
 442 {
 443     wxCHECK_RET( n >= 0 && n < m_noItems,
 444                  wxT("invalid index in wxListBox::SetClientData") );
 445
 446 #if wxUSE_OWNER_DRAWN
 447     if ( m_windowStyle & wxLB_OWNERDRAW )
 448     {
 449         // client data must be pointer to wxOwnerDrawn, otherwise we would crash
 450         // in OnMeasure/OnDraw.
 451         wxFAIL_MSG(wxT("Can't use client data with owner-drawn listboxes"));
 452     }
 453 #endif // wxUSE_OWNER_DRAWN
 454
 455     if ( ListBox_SetItemData(GetHwnd(), n, clientData) == LB_ERR )
 456         wxLogDebug(wxT("LB_SETITEMDATA failed"));
 457 }
 458
 459 // Return number of selections and an array of selected integers
 460 int wxListBox::GetSelections(wxArrayInt& aSelections) const
 461 {
 462     aSelections.Empty();
 463
 464     if ( HasMultipleSelection() )
 465     {
 466         int no_sel = ListBox_GetSelCount(GetHwnd());
 467         if (no_sel != 0) {
 468             int *selections = new int[no_sel];
 469             int rc = ListBox_GetSelItems(GetHwnd(), no_sel, selections);
 470
 471             wxCHECK_MSG(rc != LB_ERR, -1, wxT("ListBox_GetSelItems failed"));
 472
 473             aSelections.Alloc(no_sel);
 474             for ( int n = 0; n < no_sel; n++ )
 475                 aSelections.Add(selections[n]);
 476
 477             delete [] selections;
 478         }
 479
 480         return no_sel;
 481     }
 482     else  // single-selection listbox
 483     {
 484         if (ListBox_GetCurSel(GetHwnd()) > -1)
 485             aSelections.Add(ListBox_GetCurSel(GetHwnd()));
 486
 487         return aSelections.Count();
 488     }
 489 }
 490
 491 // Get single selection, for single choice list items
 492 int wxListBox::GetSelection() const
 493 {
 494     wxCHECK_MSG( !HasMultipleSelection(),
 495                  -1,
 496                  wxT("GetSelection() can't be used with multiple-selection listboxes, use GetSelections() instead.") );
 497
 498     return ListBox_GetCurSel(GetHwnd());
 499 }
 500
 501 // Find string for position
 502 wxString wxListBox::GetString(int N) const
 503 {
 504     wxCHECK_MSG( N >= 0 && N < m_noItems, "",
 505                  wxT("invalid index in wxListBox::GetClientData") );
 506
 507     int len = ListBox_GetTextLen(GetHwnd(), N);
 508
 509     // +1 for terminating NUL
 510     wxString result;
 511     ListBox_GetText(GetHwnd(), N, result.GetWriteBuf(len + 1));
 512     result.UngetWriteBuf();
 513
 514     return result;
 515 }
 516
 517 void
 518 wxListBox::DoInsertItems(const wxArrayString& items, int pos)
 519 {
 520     wxCHECK_RET( pos >= 0 && pos <= m_noItems,
 521                  wxT("invalid index in wxListBox::InsertItems") );
 522
 523     int nItems = items.GetCount();
 524     for ( int i = 0; i < nItems; i++ )
 525         ListBox_InsertString(GetHwnd(), i + pos, items[i]);
 526     m_noItems += nItems;
 527
 528     SetHorizontalExtent();
 529 }
 530
 531 void wxListBox::SetString(int N, const wxString& s)
 532 {
 533     wxCHECK_RET( N >= 0 && N < m_noItems,
 534                  wxT("invalid index in wxListBox::SetString") );
 535
 536     // remember the state of the item
 537     bool wasSelected = IsSelected(N);
 538
 539     void *oldData = NULL;
 540     wxClientData *oldObjData = NULL;
 541     if ( m_clientDataItemsType == wxClientData_Void )
 542         oldData = GetClientData(N);
 543     else if ( m_clientDataItemsType == wxClientData_Object )
 544         oldObjData = GetClientObject(N);
 545
 546     // delete and recreate it
 547     SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);
 548
 549     int newN = N;
 550     if ( N == m_noItems - 1 )
 551         newN = -1;
 552
 553     ListBox_InsertString(GetHwnd(), newN, s);
 554
 555     // restore the client data
 556     if ( oldData )
 557         SetClientData(N, oldData);
 558     else if ( oldObjData )
 559         SetClientObject(N, oldObjData);
 560
 561     // we may have lost the selection
 562     if ( wasSelected )
 563         Select(N);
 564
 565 #if wxUSE_OWNER_DRAWN
 566     if ( m_windowStyle & wxLB_OWNERDRAW )
 567         // update item's text
 568         m_aItems[N]->SetName(s);
 569 #endif  //USE_OWNER_DRAWN
 570 }
 571
 572 int wxListBox::GetCount() const
 573 {
 574     return m_noItems;
 575 }
 576
 577 // ----------------------------------------------------------------------------
 578 // helpers
 579 // ----------------------------------------------------------------------------
 580
 581 // Windows-specific code to set the horizontal extent of the listbox, if
 582 // necessary. If s is non-NULL, it's used to calculate the horizontal extent.
 583 // Otherwise, all strings are used.
 584 void wxListBox::SetHorizontalExtent(const wxString& s)
 585 {
 586     // Only necessary if we want a horizontal scrollbar
 587     if (!(m_windowStyle & wxHSCROLL))
 588         return;
 589     TEXTMETRIC lpTextMetric;
 590
 591     if ( !s.IsEmpty() )
 592     {
 593         int existingExtent = (int)SendMessage(GetHwnd(), LB_GETHORIZONTALEXTENT, 0, 0L);
 594         HDC dc = GetWindowDC(GetHwnd());
 595         HFONT oldFont = 0;
 596         if (GetFont().Ok() && GetFont().GetResourceHandle())
 597             oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
 598
 599         GetTextMetrics(dc, &lpTextMetric);
 600         SIZE extentXY;
 601         ::GetTextExtentPoint(dc, (LPTSTR) (const wxChar *)s, s.Length(), &extentXY);
 602         int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 603
 604         if (oldFont)
 605             ::SelectObject(dc, oldFont);
 606
 607         ReleaseDC(GetHwnd(), dc);
 608         if (extentX > existingExtent)
 609             SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(extentX), 0L);
 610     }
 611     else
 612     {
 613         int largestExtent = 0;
 614         HDC dc = GetWindowDC(GetHwnd());
 615         HFONT oldFont = 0;
 616         if (GetFont().Ok() && GetFont().GetResourceHandle())
 617             oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
 618
 619         GetTextMetrics(dc, &lpTextMetric);
 620         int i;
 621         for (i = 0; i < m_noItems; i++)
 622         {
 623             int len = (int)SendMessage(GetHwnd(), LB_GETTEXT, i, (LONG)wxBuffer);
 624             wxBuffer[len] = 0;
 625             SIZE extentXY;
 626             ::GetTextExtentPoint(dc, (LPTSTR)wxBuffer, len, &extentXY);
 627             int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 628             if (extentX > largestExtent)
 629                 largestExtent = extentX;
 630         }
 631         if (oldFont)
 632             ::SelectObject(dc, oldFont);
 633
 634         ReleaseDC(GetHwnd(), dc);
 635         SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(largestExtent), 0L);
 636     }
 637 }
 638
 639 wxSize wxListBox::DoGetBestSize() const
 640 {
 641     // find the widest string
 642     int wLine;
 643     int wListbox = 0;
 644     for ( int i = 0; i < m_noItems; i++ )
 645     {
 646         wxString str(GetString(i));
 647         GetTextExtent(str, &wLine, NULL);
 648         if ( wLine > wListbox )
 649             wListbox = wLine;
 650     }
 651
 652     // give it some reasonable default value if there are no strings in the
 653     // list
 654     if ( wListbox == 0 )
 655         wListbox = 100;
 656
 657     // the listbox should be slightly larger than the widest string
 658     int cx, cy;
 659     wxGetCharSize(GetHWND(), &cx, &cy, &GetFont());
 660
 661     wListbox += 3*cx;
 662
 663     // don't make the listbox too tall (limit height to 10 items) but don't
 664     // make it too small neither
 665     int hListbox = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy)*
 666                     wxMin(wxMax(m_noItems, 3), 10);
 667
 668     return wxSize(wListbox, hListbox);
 669 }
 670
 671 // ----------------------------------------------------------------------------
 672 // callbacks
 673 // ----------------------------------------------------------------------------
 674
 675 bool wxListBox::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 676 {
 677     wxEventType evtType;
 678     if ( param == LBN_SELCHANGE )
 679     {
 680         evtType = wxEVT_COMMAND_LISTBOX_SELECTED;
 681     }
 682     else if ( param == LBN_DBLCLK )
 683     {
 684         evtType = wxEVT_COMMAND_LISTBOX_DOUBLECLICKED;
 685     }
 686     else
 687     {
 688         // some event we're not interested in
 689         return FALSE;
 690     }
 691
 692     wxCommandEvent event(evtType, m_windowId);
 693     event.SetEventObject( this );
 694
 695     wxArrayInt aSelections;
 696     int n, count = GetSelections(aSelections);
 697     if ( count > 0 )
 698     {
 699         n = aSelections[0];
 700         if ( HasClientObjectData() )
 701             event.SetClientObject( GetClientObject(n) );
 702         else if ( HasClientUntypedData() )
 703             event.SetClientData( GetClientData(n) );
 704         event.SetString( GetString(n) );
 705     }
 706     else
 707     {
 708         n = -1;
 709     }
 710
 711     event.m_commandInt = n;
 712
 713     return GetEventHandler()->ProcessEvent(event);
 714 }
 715
 716 // ----------------------------------------------------------------------------
 717 // wxCheckListBox support
 718 // ----------------------------------------------------------------------------
 719
 720 #if wxUSE_OWNER_DRAWN
 721
 722 // drawing
 723 // -------
 724
 725 // space beneath/above each row in pixels
 726 // "standard" checklistbox use 1 here, some might prefer 2. 0 is ugly.
 727 #define OWNER_DRAWN_LISTBOX_EXTRA_SPACE    (1)
 728
 729 // the height is the same for all items
 730 // TODO should be changed for LBS_OWNERDRAWVARIABLE style listboxes
 731
 732 // NB: can't forward this to wxListBoxItem because LB_SETITEMDATA
 733 //     message is not yet sent when we get here!
 734 bool wxListBox::MSWOnMeasure(WXMEASUREITEMSTRUCT *item)
 735 {
 736     // only owner-drawn control should receive this message
 737     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), FALSE );
 738
 739     MEASUREITEMSTRUCT *pStruct = (MEASUREITEMSTRUCT *)item;
 740
 741     HDC hdc = CreateIC(wxT("DISPLAY"), NULL, NULL, 0);
 742
 743     wxDC dc;
 744     dc.SetHDC((WXHDC)hdc);
 745     dc.SetFont(wxSystemSettings::GetSystemFont(wxSYS_ANSI_VAR_FONT));
 746
 747     pStruct->itemHeight = dc.GetCharHeight() + 2*OWNER_DRAWN_LISTBOX_EXTRA_SPACE;
 748     pStruct->itemWidth  = dc.GetCharWidth();
 749
 750     dc.SetHDC(0);
 751
 752     DeleteDC(hdc);
 753
 754     return TRUE;
 755 }
 756
 757 // forward the message to the appropriate item
 758 bool wxListBox::MSWOnDraw(WXDRAWITEMSTRUCT *item)
 759 {
 760     // only owner-drawn control should receive this message
 761     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), FALSE );
 762
 763     DRAWITEMSTRUCT *pStruct = (DRAWITEMSTRUCT *)item;
 764     UINT itemID = pStruct->itemID;
 765
 766     // the item may be -1 for an empty listbox
 767     if ( itemID == (UINT)-1 )
 768         return FALSE;
 769
 770     long data = ListBox_GetItemData(GetHwnd(), pStruct->itemID);
 771
 772     wxCHECK( data && (data != LB_ERR), FALSE );
 773
 774     wxListBoxItem *pItem = (wxListBoxItem *)data;
 775
 776     wxDCTemp dc((WXHDC)pStruct->hDC);
 777     wxRect rect(wxPoint(pStruct->rcItem.left, pStruct->rcItem.top),
 778                 wxPoint(pStruct->rcItem.right, pStruct->rcItem.bottom));
 779
 780     return pItem->OnDrawItem(dc, rect,
 781                              (wxOwnerDrawn::wxODAction)pStruct->itemAction,
 782                              (wxOwnerDrawn::wxODStatus)pStruct->itemState);
 783 }
 784
 785 #endif // wxUSE_OWNER_DRAWN
 786
 787 #endif // wxUSE_LISTBOX