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     SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW));
 149     SetForegroundColour(parent->GetForegroundColour());
 150
 151     m_windowId = ( id == -1 ) ? (int)NewControlId() : id;
 152
 153     int x = pos.x;
 154     int y = pos.y;
 155     int width = size.x;
 156     int height = size.y;
 157     m_windowStyle = style;
 158
 159     DWORD wstyle = WS_VISIBLE | WS_VSCROLL | WS_TABSTOP |
 160                    LBS_NOTIFY | LBS_HASSTRINGS /* | WS_CLIPSIBLINGS */;
 161
 162     wxASSERT_MSG( !(style & wxLB_MULTIPLE) || !(style & wxLB_EXTENDED),
 163                   _T("only one of listbox selection modes can be specified") );
 164     if ( m_windowStyle & wxCLIP_SIBLINGS )
 165         wstyle |= WS_CLIPSIBLINGS;
 166
 167     if (m_windowStyle & wxLB_MULTIPLE)
 168         wstyle |= LBS_MULTIPLESEL;
 169     else if (m_windowStyle & wxLB_EXTENDED)
 170         wstyle |= LBS_EXTENDEDSEL;
 171
 172     if (m_windowStyle & wxLB_ALWAYS_SB)
 173         wstyle |= LBS_DISABLENOSCROLL;
 174     if (m_windowStyle & wxLB_HSCROLL)
 175         wstyle |= WS_HSCROLL;
 176     if (m_windowStyle & wxLB_SORT)
 177         wstyle |= LBS_SORT;
 178
 179 #if wxUSE_OWNER_DRAWN
 180     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 181         // we don't support LBS_OWNERDRAWVARIABLE yet
 182         wstyle |= LBS_OWNERDRAWFIXED;
 183     }
 184 #endif
 185
 186     // Without this style, you get unexpected heights, so e.g. constraint layout
 187     // doesn't work properly
 188     wstyle |= LBS_NOINTEGRALHEIGHT;
 189
 190     bool want3D;
 191     WXDWORD exStyle = Determine3DEffects(WS_EX_CLIENTEDGE, &want3D);
 192
 193     // Even with extended styles, need to combine with WS_BORDER for them to
 194     // look right.
 195     if ( want3D || wxStyleHasBorder(m_windowStyle) )
 196     {
 197         wstyle |= WS_BORDER;
 198     }
 199
 200     m_hWnd = (WXHWND)::CreateWindowEx(exStyle, wxT("LISTBOX"), NULL,
 201             wstyle | WS_CHILD,
 202             0, 0, 0, 0,
 203             (HWND)parent->GetHWND(), (HMENU)m_windowId,
 204             wxGetInstance(), NULL);
 205
 206     wxCHECK_MSG( m_hWnd, FALSE, wxT("Failed to create listbox") );
 207
 208 #if wxUSE_CTL3D
 209     if (want3D)
 210     {
 211         Ctl3dSubclassCtl(GetHwnd());
 212         m_useCtl3D = TRUE;
 213     }
 214 #endif
 215
 216     // Subclass again to catch messages
 217     SubclassWin(m_hWnd);
 218
 219     size_t ui;
 220     for (ui = 0; ui < (size_t)n; ui++) {
 221         Append(choices[ui]);
 222     }
 223
 224     if ( (m_windowStyle & wxLB_MULTIPLE) == 0 )
 225         SendMessage(GetHwnd(), LB_SETCURSEL, 0, 0);
 226
 227     SetFont(parent->GetFont());
 228
 229     SetSize(x, y, width, height);
 230
 231     return TRUE;
 232 }
 233
 234 wxListBox::~wxListBox()
 235 {
 236     Free();
 237 }
 238
 239 void wxListBox::SetupColours()
 240 {
 241     SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW));
 242     SetForegroundColour(GetParent()->GetForegroundColour());
 243 }
 244
 245 // ----------------------------------------------------------------------------
 246 // implementation of wxListBoxBase methods
 247 // ----------------------------------------------------------------------------
 248
 249 void wxListBox::DoSetFirstItem(int N)
 250 {
 251     wxCHECK_RET( N >= 0 && N < m_noItems,
 252                  wxT("invalid index in wxListBox::SetFirstItem") );
 253
 254     SendMessage(GetHwnd(), LB_SETTOPINDEX, (WPARAM)N, (LPARAM)0);
 255 }
 256
 257 void wxListBox::Delete(int N)
 258 {
 259     wxCHECK_RET( N >= 0 && N < m_noItems,
 260                  wxT("invalid index in wxListBox::Delete") );
 261
 262     // for owner drawn objects, the data is used for storing wxOwnerDrawn
 263     // pointers and we shouldn't touch it
 264 #if !wxUSE_OWNER_DRAWN
 265     if ( !(m_windowStyle & wxLB_OWNERDRAW) )
 266 #endif // !wxUSE_OWNER_DRAWN
 267         if ( HasClientObjectData() )
 268         {
 269             delete GetClientObject(N);
 270         }
 271
 272     SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);
 273     m_noItems--;
 274
 275     SetHorizontalExtent("");
 276 }
 277
 278 int wxListBox::DoAppend(const wxString& item)
 279 {
 280     int index = ListBox_AddString(GetHwnd(), item);
 281     m_noItems++;
 282
 283 #if wxUSE_OWNER_DRAWN
 284     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 285         wxOwnerDrawn *pNewItem = CreateItem(index); // dummy argument
 286         pNewItem->SetName(item);
 287         m_aItems.Insert(pNewItem, index);
 288         ListBox_SetItemData(GetHwnd(), index, pNewItem);
 289         pNewItem->SetFont(GetFont());
 290     }
 291 #endif // wxUSE_OWNER_DRAWN
 292
 293     SetHorizontalExtent(item);
 294
 295     return index;
 296 }
 297
 298 void wxListBox::DoSetItems(const wxArrayString& choices, void** clientData)
 299 {
 300     // avoid flicker - but don't need to do this for a hidden listbox
 301     bool hideAndShow = IsShown();
 302     if ( hideAndShow )
 303     {
 304         ShowWindow(GetHwnd(), SW_HIDE);
 305     }
 306
 307     ListBox_ResetContent(GetHwnd());
 308
 309     m_noItems = choices.GetCount();
 310     int i;
 311     for (i = 0; i < m_noItems; i++)
 312     {
 313         ListBox_AddString(GetHwnd(), choices[i]);
 314         if ( clientData )
 315         {
 316 #if wxUSE_OWNER_DRAWN
 317             if ( m_windowStyle & wxLB_OWNERDRAW )
 318             {
 319                 wxASSERT_MSG(clientData[i] == NULL,
 320                              wxT("Can't use client data with owner-drawn listboxes"));
 321             }
 322             ListBox_SetItemData(GetHwnd(), i, clientData[i]);
 323 #else // !wxUSE_OWNER_DRAWN
 324             ListBox_SetItemData(GetHwnd(), i, clientData[i]);
 325 #endif // wxUSE_OWNER_DRAWN/!wxUSE_OWNER_DRAWN
 326         }
 327     }
 328
 329 #if wxUSE_OWNER_DRAWN
 330     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 331         // first delete old items
 332         WX_CLEAR_ARRAY(m_aItems);
 333
 334         // then create new ones
 335         for ( size_t ui = 0; ui < (size_t)m_noItems; ui++ ) {
 336             wxOwnerDrawn *pNewItem = CreateItem(ui);
 337             pNewItem->SetName(choices[ui]);
 338             m_aItems.Add(pNewItem);
 339             ListBox_SetItemData(GetHwnd(), ui, pNewItem);
 340         }
 341     }
 342 #endif // wxUSE_OWNER_DRAWN
 343
 344     SetHorizontalExtent();
 345
 346     if ( hideAndShow )
 347     {
 348         // show the listbox back if we hid it
 349         ShowWindow(GetHwnd(), SW_SHOW);
 350     }
 351 }
 352
 353 int wxListBox::FindString(const wxString& s) const
 354 {
 355     int pos = ListBox_FindStringExact(GetHwnd(), (WPARAM)-1, s);
 356     if (pos == LB_ERR)
 357         return wxNOT_FOUND;
 358     else
 359         return pos;
 360 }
 361
 362 void wxListBox::Clear()
 363 {
 364     Free();
 365
 366     ListBox_ResetContent(GetHwnd());
 367
 368     m_noItems = 0;
 369     SetHorizontalExtent();
 370 }
 371
 372 void wxListBox::Free()
 373 {
 374 #if wxUSE_OWNER_DRAWN
 375     if ( m_windowStyle & wxLB_OWNERDRAW )
 376     {
 377         WX_CLEAR_ARRAY(m_aItems);
 378     }
 379     else
 380 #endif // wxUSE_OWNER_DRAWN
 381     if ( HasClientObjectData() )
 382     {
 383         for ( size_t n = 0; n < (size_t)m_noItems; n++ )
 384         {
 385             delete GetClientObject(n);
 386         }
 387     }
 388 }
 389
 390 void wxListBox::SetSelection(int N, bool select)
 391 {
 392     wxCHECK_RET( N >= 0 && N < m_noItems,
 393                  wxT("invalid index in wxListBox::SetSelection") );
 394
 395     if ( HasMultipleSelection() )
 396     {
 397         SendMessage(GetHwnd(), LB_SETSEL, select, N);
 398     }
 399     else
 400     {
 401         SendMessage(GetHwnd(), LB_SETCURSEL, select ? N : -1, 0);
 402     }
 403 }
 404
 405 bool wxListBox::IsSelected(int N) const
 406 {
 407     wxCHECK_MSG( N >= 0 && N < m_noItems, FALSE,
 408                  wxT("invalid index in wxListBox::Selected") );
 409
 410     return SendMessage(GetHwnd(), LB_GETSEL, N, 0) == 0 ? FALSE : TRUE;
 411 }
 412
 413 wxClientData* wxListBox::DoGetItemClientObject(int n) const
 414 {
 415     return (wxClientData *)DoGetItemClientData(n);
 416 }
 417
 418 void *wxListBox::DoGetItemClientData(int n) const
 419 {
 420     wxCHECK_MSG( n >= 0 && n < m_noItems, NULL,
 421                  wxT("invalid index in wxListBox::GetClientData") );
 422
 423     return (void *)SendMessage(GetHwnd(), LB_GETITEMDATA, n, 0);
 424 }
 425
 426 void wxListBox::DoSetItemClientObject(int n, wxClientData* clientData)
 427 {
 428     DoSetItemClientData(n, clientData);
 429 }
 430
 431 void wxListBox::DoSetItemClientData(int n, void *clientData)
 432 {
 433     wxCHECK_RET( n >= 0 && n < m_noItems,
 434                  wxT("invalid index in wxListBox::SetClientData") );
 435
 436 #if wxUSE_OWNER_DRAWN
 437     if ( m_windowStyle & wxLB_OWNERDRAW )
 438     {
 439         // client data must be pointer to wxOwnerDrawn, otherwise we would crash
 440         // in OnMeasure/OnDraw.
 441         wxFAIL_MSG(wxT("Can't use client data with owner-drawn listboxes"));
 442     }
 443 #endif // wxUSE_OWNER_DRAWN
 444
 445     if ( ListBox_SetItemData(GetHwnd(), n, clientData) == LB_ERR )
 446         wxLogDebug(wxT("LB_SETITEMDATA failed"));
 447 }
 448
 449 // Return number of selections and an array of selected integers
 450 int wxListBox::GetSelections(wxArrayInt& aSelections) const
 451 {
 452     aSelections.Empty();
 453
 454     if ( HasMultipleSelection() )
 455     {
 456         int countSel = ListBox_GetSelCount(GetHwnd());
 457         if ( countSel == LB_ERR )
 458         {
 459             wxLogDebug(_T("ListBox_GetSelCount failed"));
 460         }
 461         else if ( countSel != 0 )
 462         {
 463             int *selections = new int[countSel];
 464
 465             if ( ListBox_GetSelItems(GetHwnd(),
 466                                      countSel, selections) == LB_ERR )
 467             {
 468                 wxLogDebug(wxT("ListBox_GetSelItems failed"));
 469                 countSel = -1;
 470             }
 471             else
 472             {
 473                 aSelections.Alloc(countSel);
 474                 for ( int n = 0; n < countSel; n++ )
 475                     aSelections.Add(selections[n]);
 476             }
 477
 478             delete [] selections;
 479         }
 480
 481         return countSel;
 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     {
 527         int idx = ListBox_InsertString(GetHwnd(), i + pos, items[i]);
 528
 529 #if wxUSE_OWNER_DRAWN
 530         if ( m_windowStyle & wxLB_OWNERDRAW )
 531         {
 532             wxOwnerDrawn *pNewItem = CreateItem(idx);
 533             pNewItem->SetName(items[i]);
 534             pNewItem->SetFont(GetFont());
 535             m_aItems.Insert(pNewItem, idx);
 536
 537             ListBox_SetItemData(GetHwnd(), idx, pNewItem);
 538         }
 539 #endif // wxUSE_OWNER_DRAWN
 540     }
 541
 542     m_noItems += nItems;
 543
 544     SetHorizontalExtent();
 545 }
 546
 547 void wxListBox::SetString(int N, const wxString& s)
 548 {
 549     wxCHECK_RET( N >= 0 && N < m_noItems,
 550                  wxT("invalid index in wxListBox::SetString") );
 551
 552     // remember the state of the item
 553     bool wasSelected = IsSelected(N);
 554
 555     void *oldData = NULL;
 556     wxClientData *oldObjData = NULL;
 557     if ( m_clientDataItemsType == wxClientData_Void )
 558         oldData = GetClientData(N);
 559     else if ( m_clientDataItemsType == wxClientData_Object )
 560         oldObjData = GetClientObject(N);
 561
 562     // delete and recreate it
 563     SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);
 564
 565     int newN = N;
 566     if ( N == m_noItems - 1 )
 567         newN = -1;
 568
 569     ListBox_InsertString(GetHwnd(), newN, s);
 570
 571     // restore the client data
 572     if ( oldData )
 573         SetClientData(N, oldData);
 574     else if ( oldObjData )
 575         SetClientObject(N, oldObjData);
 576
 577     // we may have lost the selection
 578     if ( wasSelected )
 579         Select(N);
 580
 581 #if wxUSE_OWNER_DRAWN
 582     if ( m_windowStyle & wxLB_OWNERDRAW )
 583     {
 584         // update item's text
 585         m_aItems[N]->SetName(s);
 586
 587         // reassign the item's data
 588         ListBox_SetItemData(GetHwnd(), N, m_aItems[N]);
 589     }
 590 #endif  //USE_OWNER_DRAWN
 591 }
 592
 593 int wxListBox::GetCount() const
 594 {
 595     return m_noItems;
 596 }
 597
 598 // ----------------------------------------------------------------------------
 599 // helpers
 600 // ----------------------------------------------------------------------------
 601
 602 // Windows-specific code to set the horizontal extent of the listbox, if
 603 // necessary. If s is non-NULL, it's used to calculate the horizontal extent.
 604 // Otherwise, all strings are used.
 605 void wxListBox::SetHorizontalExtent(const wxString& s)
 606 {
 607     // Only necessary if we want a horizontal scrollbar
 608     if (!(m_windowStyle & wxHSCROLL))
 609         return;
 610     TEXTMETRIC lpTextMetric;
 611
 612     if ( !s.IsEmpty() )
 613     {
 614         int existingExtent = (int)SendMessage(GetHwnd(), LB_GETHORIZONTALEXTENT, 0, 0L);
 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         SIZE extentXY;
 622         ::GetTextExtentPoint(dc, (LPTSTR) (const wxChar *)s, s.Length(), &extentXY);
 623         int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 624
 625         if (oldFont)
 626             ::SelectObject(dc, oldFont);
 627
 628         ReleaseDC(GetHwnd(), dc);
 629         if (extentX > existingExtent)
 630             SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(extentX), 0L);
 631     }
 632     else
 633     {
 634         int largestExtent = 0;
 635         HDC dc = GetWindowDC(GetHwnd());
 636         HFONT oldFont = 0;
 637         if (GetFont().Ok() && GetFont().GetResourceHandle())
 638             oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
 639
 640         GetTextMetrics(dc, &lpTextMetric);
 641         int i;
 642         for (i = 0; i < m_noItems; i++)
 643         {
 644             int len = (int)SendMessage(GetHwnd(), LB_GETTEXT, i, (LONG)wxBuffer);
 645             wxBuffer[len] = 0;
 646             SIZE extentXY;
 647             ::GetTextExtentPoint(dc, (LPTSTR)wxBuffer, len, &extentXY);
 648             int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 649             if (extentX > largestExtent)
 650                 largestExtent = extentX;
 651         }
 652         if (oldFont)
 653             ::SelectObject(dc, oldFont);
 654
 655         ReleaseDC(GetHwnd(), dc);
 656         SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(largestExtent), 0L);
 657     }
 658 }
 659
 660 wxSize wxListBox::DoGetBestSize() const
 661 {
 662     // find the widest string
 663     int wLine;
 664     int wListbox = 0;
 665     for ( int i = 0; i < m_noItems; i++ )
 666     {
 667         wxString str(GetString(i));
 668         GetTextExtent(str, &wLine, NULL);
 669         if ( wLine > wListbox )
 670             wListbox = wLine;
 671     }
 672
 673     // give it some reasonable default value if there are no strings in the
 674     // list
 675     if ( wListbox == 0 )
 676         wListbox = 100;
 677
 678     // the listbox should be slightly larger than the widest string
 679     int cx, cy;
 680     wxGetCharSize(GetHWND(), &cx, &cy, &GetFont());
 681
 682     wListbox += 3*cx;
 683
 684     // don't make the listbox too tall (limit height to 10 items) but don't
 685     // make it too small neither
 686     int hListbox = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy)*
 687                     wxMin(wxMax(m_noItems, 3), 10);
 688
 689     return wxSize(wListbox, hListbox);
 690 }
 691
 692 // ----------------------------------------------------------------------------
 693 // callbacks
 694 // ----------------------------------------------------------------------------
 695
 696 bool wxListBox::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 697 {
 698     wxEventType evtType;
 699     if ( param == LBN_SELCHANGE )
 700     {
 701         evtType = wxEVT_COMMAND_LISTBOX_SELECTED;
 702     }
 703     else if ( param == LBN_DBLCLK )
 704     {
 705         evtType = wxEVT_COMMAND_LISTBOX_DOUBLECLICKED;
 706     }
 707     else
 708     {
 709         // some event we're not interested in
 710         return FALSE;
 711     }
 712
 713     wxCommandEvent event(evtType, m_windowId);
 714     event.SetEventObject( this );
 715
 716     wxArrayInt aSelections;
 717     int n, count = GetSelections(aSelections);
 718     if ( count > 0 )
 719     {
 720         n = aSelections[0];
 721         if ( HasClientObjectData() )
 722             event.SetClientObject( GetClientObject(n) );
 723         else if ( HasClientUntypedData() )
 724             event.SetClientData( GetClientData(n) );
 725         event.SetString( GetString(n) );
 726     }
 727     else
 728     {
 729         n = -1;
 730     }
 731
 732     event.m_commandInt = n;
 733
 734     return GetEventHandler()->ProcessEvent(event);
 735 }
 736
 737 // ----------------------------------------------------------------------------
 738 // wxCheckListBox support
 739 // ----------------------------------------------------------------------------
 740
 741 #if wxUSE_OWNER_DRAWN
 742
 743 // drawing
 744 // -------
 745
 746 // space beneath/above each row in pixels
 747 // "standard" checklistbox use 1 here, some might prefer 2. 0 is ugly.
 748 #define OWNER_DRAWN_LISTBOX_EXTRA_SPACE    (1)
 749
 750 // the height is the same for all items
 751 // TODO should be changed for LBS_OWNERDRAWVARIABLE style listboxes
 752
 753 // NB: can't forward this to wxListBoxItem because LB_SETITEMDATA
 754 //     message is not yet sent when we get here!
 755 bool wxListBox::MSWOnMeasure(WXMEASUREITEMSTRUCT *item)
 756 {
 757     // only owner-drawn control should receive this message
 758     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), FALSE );
 759
 760     MEASUREITEMSTRUCT *pStruct = (MEASUREITEMSTRUCT *)item;
 761
 762     HDC hdc = CreateIC(wxT("DISPLAY"), NULL, NULL, 0);
 763
 764     wxDC dc;
 765     dc.SetHDC((WXHDC)hdc);
 766     dc.SetFont(wxSystemSettings::GetFont(wxSYS_ANSI_VAR_FONT));
 767
 768     pStruct->itemHeight = dc.GetCharHeight() + 2*OWNER_DRAWN_LISTBOX_EXTRA_SPACE;
 769     pStruct->itemWidth  = dc.GetCharWidth();
 770
 771     dc.SetHDC(0);
 772
 773     DeleteDC(hdc);
 774
 775     return TRUE;
 776 }
 777
 778 // forward the message to the appropriate item
 779 bool wxListBox::MSWOnDraw(WXDRAWITEMSTRUCT *item)
 780 {
 781     // only owner-drawn control should receive this message
 782     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), FALSE );
 783
 784     DRAWITEMSTRUCT *pStruct = (DRAWITEMSTRUCT *)item;
 785     UINT itemID = pStruct->itemID;
 786
 787     // the item may be -1 for an empty listbox
 788     if ( itemID == (UINT)-1 )
 789         return FALSE;
 790
 791     long data = ListBox_GetItemData(GetHwnd(), pStruct->itemID);
 792
 793     wxCHECK( data && (data != LB_ERR), FALSE );
 794
 795     wxListBoxItem *pItem = (wxListBoxItem *)data;
 796
 797     wxDCTemp dc((WXHDC)pStruct->hDC);
 798     wxRect rect(wxPoint(pStruct->rcItem.left, pStruct->rcItem.top),
 799                 wxPoint(pStruct->rcItem.right, pStruct->rcItem.bottom));
 800
 801     return pItem->OnDrawItem(dc, rect,
 802                              (wxOwnerDrawn::wxODAction)pStruct->itemAction,
 803                              (wxOwnerDrawn::wxODStatus)pStruct->itemState);
 804 }
 805
 806 #endif // wxUSE_OWNER_DRAWN
 807
 808 #endif // wxUSE_LISTBOX