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 licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  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 #include "wx/dynarray.h"
  40 #include "wx/log.h"
  41
  42 #if wxUSE_OWNER_DRAWN
  43     #include  "wx/ownerdrw.h"
  44 #endif
  45
  46 #ifdef __GNUWIN32_OLD__
  47     #include "wx/msw/gnuwin32/extra.h"
  48 #endif
  49
  50 #if wxUSE_EXTENDED_RTTI
  51 WX_DEFINE_FLAGS( wxListBoxStyle )
  52
  53 wxBEGIN_FLAGS( wxListBoxStyle )
  54     // new style border flags, we put them first to
  55     // use them for streaming out
  56     wxFLAGS_MEMBER(wxBORDER_SIMPLE)
  57     wxFLAGS_MEMBER(wxBORDER_SUNKEN)
  58     wxFLAGS_MEMBER(wxBORDER_DOUBLE)
  59     wxFLAGS_MEMBER(wxBORDER_RAISED)
  60     wxFLAGS_MEMBER(wxBORDER_STATIC)
  61     wxFLAGS_MEMBER(wxBORDER_NONE)
  62
  63     // old style border flags
  64     wxFLAGS_MEMBER(wxSIMPLE_BORDER)
  65     wxFLAGS_MEMBER(wxSUNKEN_BORDER)
  66     wxFLAGS_MEMBER(wxDOUBLE_BORDER)
  67     wxFLAGS_MEMBER(wxRAISED_BORDER)
  68     wxFLAGS_MEMBER(wxSTATIC_BORDER)
  69     wxFLAGS_MEMBER(wxBORDER)
  70
  71     // standard window styles
  72     wxFLAGS_MEMBER(wxTAB_TRAVERSAL)
  73     wxFLAGS_MEMBER(wxCLIP_CHILDREN)
  74     wxFLAGS_MEMBER(wxTRANSPARENT_WINDOW)
  75     wxFLAGS_MEMBER(wxWANTS_CHARS)
  76     wxFLAGS_MEMBER(wxFULL_REPAINT_ON_RESIZE)
  77     wxFLAGS_MEMBER(wxALWAYS_SHOW_SB )
  78     wxFLAGS_MEMBER(wxVSCROLL)
  79     wxFLAGS_MEMBER(wxHSCROLL)
  80
  81     wxFLAGS_MEMBER(wxLB_SINGLE)
  82     wxFLAGS_MEMBER(wxLB_MULTIPLE)
  83     wxFLAGS_MEMBER(wxLB_EXTENDED)
  84     wxFLAGS_MEMBER(wxLB_HSCROLL)
  85     wxFLAGS_MEMBER(wxLB_ALWAYS_SB)
  86     wxFLAGS_MEMBER(wxLB_NEEDED_SB)
  87     wxFLAGS_MEMBER(wxLB_SORT)
  88
  89 wxEND_FLAGS( wxListBoxStyle )
  90
  91 IMPLEMENT_DYNAMIC_CLASS_XTI(wxListBox, wxControl,"wx/listbox.h")
  92
  93 wxBEGIN_PROPERTIES_TABLE(wxListBox)
  94         wxEVENT_PROPERTY( Select , wxEVT_COMMAND_LISTBOX_SELECTED , wxCommandEvent )
  95         wxEVENT_PROPERTY( DoubleClick , wxEVT_COMMAND_LISTBOX_DOUBLECLICKED , wxCommandEvent )
  96
  97     wxPROPERTY( Font , wxFont , SetFont , GetFont  , , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
  98     wxPROPERTY_COLLECTION( Choices , wxArrayString , wxString , AppendString , GetStrings, 0 /*flags*/ , wxT("Helpstring") , wxT("group") )
  99         wxPROPERTY( Selection ,int, SetSelection, GetSelection,, 0 /*flags*/ , wxT("Helpstring") , wxT("group") )
 100     wxPROPERTY_FLAGS( WindowStyle , wxListBoxStyle , long , SetWindowStyleFlag , GetWindowStyleFlag , , 0 /*flags*/ , wxT("Helpstring") , wxT("group")) // style
 101 wxEND_PROPERTIES_TABLE()
 102
 103 wxBEGIN_HANDLERS_TABLE(wxListBox)
 104 wxEND_HANDLERS_TABLE()
 105
 106 wxCONSTRUCTOR_4( wxListBox , wxWindow* , Parent , wxWindowID , Id , wxPoint , Position , wxSize , Size )
 107 #else
 108 IMPLEMENT_DYNAMIC_CLASS(wxListBox, wxControl)
 109 #endif
 110
 111 /*
 112 TODO PROPERTIES
 113         selection
 114         content
 115                 item
 116 */
 117
 118 // ============================================================================
 119 // list box item declaration and implementation
 120 // ============================================================================
 121
 122 #if wxUSE_OWNER_DRAWN
 123
 124 class wxListBoxItem : public wxOwnerDrawn
 125 {
 126 public:
 127     wxListBoxItem(const wxString& str = wxEmptyString);
 128 };
 129
 130 wxListBoxItem::wxListBoxItem(const wxString& str) : wxOwnerDrawn(str, FALSE)
 131 {
 132     // no bitmaps/checkmarks
 133     SetMarginWidth(0);
 134 }
 135
 136 wxOwnerDrawn *wxListBox::CreateLboxItem(size_t WXUNUSED(n))
 137 {
 138     return new wxListBoxItem();
 139 }
 140
 141 #endif  //USE_OWNER_DRAWN
 142
 143 // ============================================================================
 144 // list box control implementation
 145 // ============================================================================
 146
 147 // ----------------------------------------------------------------------------
 148 // creation
 149 // ----------------------------------------------------------------------------
 150
 151 // Listbox item
 152 wxListBox::wxListBox()
 153 {
 154     m_noItems = 0;
 155     m_selected = 0;
 156 }
 157
 158 bool wxListBox::Create(wxWindow *parent,
 159                        wxWindowID id,
 160                        const wxPoint& pos,
 161                        const wxSize& size,
 162                        int n, const wxString choices[],
 163                        long style,
 164                        const wxValidator& wxVALIDATOR_PARAM(validator),
 165                        const wxString& name)
 166 {
 167     m_noItems = 0;
 168     m_hWnd = 0;
 169     m_selected = 0;
 170
 171     SetName(name);
 172 #if wxUSE_VALIDATORS
 173     SetValidator(validator);
 174 #endif // wxUSE_VALIDATORS
 175
 176     if (parent)
 177         parent->AddChild(this);
 178
 179     SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW));
 180     SetForegroundColour(parent->GetForegroundColour());
 181
 182     m_windowId = ( id == -1 ) ? (int)NewControlId() : id;
 183
 184     int x = pos.x;
 185     int y = pos.y;
 186     int width = size.x;
 187     int height = size.y;
 188     m_windowStyle = style;
 189
 190     DWORD wstyle = WS_VISIBLE | WS_CHILD | WS_VSCROLL | WS_TABSTOP |
 191                    LBS_NOTIFY | LBS_HASSTRINGS ;
 192
 193     wxASSERT_MSG( !(style & wxLB_MULTIPLE) || !(style & wxLB_EXTENDED),
 194                   _T("only one of listbox selection modes can be specified") );
 195
 196     if ( (m_windowStyle & wxBORDER_MASK) == wxBORDER_DEFAULT )
 197         m_windowStyle |= wxBORDER_SUNKEN;
 198
 199     if ( m_windowStyle & wxCLIP_SIBLINGS )
 200         wstyle |= WS_CLIPSIBLINGS;
 201
 202     if (m_windowStyle & wxLB_MULTIPLE)
 203         wstyle |= LBS_MULTIPLESEL;
 204     else if (m_windowStyle & wxLB_EXTENDED)
 205         wstyle |= LBS_EXTENDEDSEL;
 206
 207     if (m_windowStyle & wxLB_ALWAYS_SB)
 208         wstyle |= LBS_DISABLENOSCROLL;
 209     if (m_windowStyle & wxLB_HSCROLL)
 210         wstyle |= WS_HSCROLL;
 211     if (m_windowStyle & wxLB_SORT)
 212         wstyle |= LBS_SORT;
 213
 214 #if wxUSE_OWNER_DRAWN && !defined(__WXWINCE__)
 215     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 216         // we don't support LBS_OWNERDRAWVARIABLE yet
 217         wstyle |= LBS_OWNERDRAWFIXED;
 218     }
 219 #endif
 220
 221     // Without this style, you get unexpected heights, so e.g. constraint layout
 222     // doesn't work properly
 223     wstyle |= LBS_NOINTEGRALHEIGHT;
 224
 225     WXDWORD exStyle = 0;
 226     (void) MSWGetStyle(m_windowStyle, & exStyle) ;
 227
 228     m_hWnd = (WXHWND)::CreateWindowEx(exStyle, wxT("LISTBOX"), NULL,
 229             wstyle ,
 230             0, 0, 0, 0,
 231             (HWND)parent->GetHWND(), (HMENU)m_windowId,
 232             wxGetInstance(), NULL);
 233
 234     wxCHECK_MSG( m_hWnd, FALSE, wxT("Failed to create listbox") );
 235
 236     // Subclass again to catch messages
 237     SubclassWin(m_hWnd);
 238
 239     size_t ui;
 240     for (ui = 0; ui < (size_t)n; ui++) {
 241         Append(choices[ui]);
 242     }
 243
 244     if ( (m_windowStyle & wxLB_MULTIPLE) == 0 )
 245         SendMessage(GetHwnd(), LB_SETCURSEL, 0, 0);
 246
 247     SetFont(parent->GetFont());
 248
 249     SetSize(x, y, width, height);
 250
 251     return TRUE;
 252 }
 253
 254 bool wxListBox::Create(wxWindow *parent,
 255                        wxWindowID id,
 256                        const wxPoint& pos,
 257                        const wxSize& size,
 258                        const wxArrayString& choices,
 259                        long style,
 260                        const wxValidator& validator,
 261                        const wxString& name)
 262 {
 263     wxCArrayString chs(choices);
 264     return Create(parent, id, pos, size, chs.GetCount(), chs.GetStrings(),
 265                   style, validator, name);
 266 }
 267
 268 wxListBox::~wxListBox()
 269 {
 270     Free();
 271 }
 272
 273 void wxListBox::SetupColours()
 274 {
 275     SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW));
 276     SetForegroundColour(GetParent()->GetForegroundColour());
 277 }
 278
 279 // ----------------------------------------------------------------------------
 280 // implementation of wxListBoxBase methods
 281 // ----------------------------------------------------------------------------
 282
 283 void wxListBox::DoSetFirstItem(int N)
 284 {
 285     wxCHECK_RET( N >= 0 && N < m_noItems,
 286                  wxT("invalid index in wxListBox::SetFirstItem") );
 287
 288     SendMessage(GetHwnd(), LB_SETTOPINDEX, (WPARAM)N, (LPARAM)0);
 289 }
 290
 291 void wxListBox::Delete(int N)
 292 {
 293     wxCHECK_RET( N >= 0 && N < m_noItems,
 294                  wxT("invalid index in wxListBox::Delete") );
 295
 296     // for owner drawn objects, the data is used for storing wxOwnerDrawn
 297     // pointers and we shouldn't touch it
 298 #if !wxUSE_OWNER_DRAWN
 299     if ( !(m_windowStyle & wxLB_OWNERDRAW) )
 300 #endif // !wxUSE_OWNER_DRAWN
 301         if ( HasClientObjectData() )
 302         {
 303             delete GetClientObject(N);
 304         }
 305
 306     SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);
 307     m_noItems--;
 308
 309     SetHorizontalExtent(wxEmptyString);
 310 }
 311
 312 int wxListBox::DoAppend(const wxString& item)
 313 {
 314     int index = ListBox_AddString(GetHwnd(), item);
 315     m_noItems++;
 316
 317 #if wxUSE_OWNER_DRAWN
 318     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 319         wxOwnerDrawn *pNewItem = CreateLboxItem(index); // dummy argument
 320         pNewItem->SetName(item);
 321         m_aItems.Insert(pNewItem, index);
 322         ListBox_SetItemData(GetHwnd(), index, pNewItem);
 323         pNewItem->SetFont(GetFont());
 324     }
 325 #endif // wxUSE_OWNER_DRAWN
 326
 327     SetHorizontalExtent(item);
 328
 329     return index;
 330 }
 331
 332 void wxListBox::DoSetItems(const wxArrayString& choices, void** clientData)
 333 {
 334     // avoid flicker - but don't need to do this for a hidden listbox
 335     bool hideAndShow = IsShown();
 336     if ( hideAndShow )
 337     {
 338         ShowWindow(GetHwnd(), SW_HIDE);
 339     }
 340
 341     ListBox_ResetContent(GetHwnd());
 342
 343     m_noItems = choices.GetCount();
 344     int i;
 345     for (i = 0; i < m_noItems; i++)
 346     {
 347         ListBox_AddString(GetHwnd(), choices[i]);
 348         if ( clientData )
 349         {
 350             SetClientData(i, clientData[i]);
 351         }
 352     }
 353
 354 #if wxUSE_OWNER_DRAWN
 355     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 356         // first delete old items
 357         WX_CLEAR_ARRAY(m_aItems);
 358
 359         // then create new ones
 360         for ( size_t ui = 0; ui < (size_t)m_noItems; ui++ ) {
 361             wxOwnerDrawn *pNewItem = CreateLboxItem(ui);
 362             pNewItem->SetName(choices[ui]);
 363             m_aItems.Add(pNewItem);
 364             ListBox_SetItemData(GetHwnd(), ui, pNewItem);
 365         }
 366     }
 367 #endif // wxUSE_OWNER_DRAWN
 368
 369     SetHorizontalExtent();
 370
 371     if ( hideAndShow )
 372     {
 373         // show the listbox back if we hid it
 374         ShowWindow(GetHwnd(), SW_SHOW);
 375     }
 376 }
 377
 378 int wxListBox::FindString(const wxString& s) const
 379 {
 380     int pos = ListBox_FindStringExact(GetHwnd(), (WPARAM)-1, s);
 381     if (pos == LB_ERR)
 382         return wxNOT_FOUND;
 383     else
 384         return pos;
 385 }
 386
 387 void wxListBox::Clear()
 388 {
 389     Free();
 390
 391     ListBox_ResetContent(GetHwnd());
 392
 393     m_noItems = 0;
 394     SetHorizontalExtent();
 395 }
 396
 397 void wxListBox::Free()
 398 {
 399 #if wxUSE_OWNER_DRAWN
 400     if ( m_windowStyle & wxLB_OWNERDRAW )
 401     {
 402         WX_CLEAR_ARRAY(m_aItems);
 403     }
 404     else
 405 #endif // wxUSE_OWNER_DRAWN
 406     if ( HasClientObjectData() )
 407     {
 408         for ( size_t n = 0; n < (size_t)m_noItems; n++ )
 409         {
 410             delete GetClientObject(n);
 411         }
 412     }
 413 }
 414
 415 void wxListBox::SetSelection(int N, bool select)
 416 {
 417     wxCHECK_RET( N == wxNOT_FOUND ||
 418                     (N >= 0 && N < m_noItems),
 419                  wxT("invalid index in wxListBox::SetSelection") );
 420
 421     if ( HasMultipleSelection() )
 422     {
 423         SendMessage(GetHwnd(), LB_SETSEL, select, N);
 424     }
 425     else
 426     {
 427         SendMessage(GetHwnd(), LB_SETCURSEL, select ? N : -1, 0);
 428     }
 429 }
 430
 431 bool wxListBox::IsSelected(int N) const
 432 {
 433     wxCHECK_MSG( N >= 0 && N < m_noItems, FALSE,
 434                  wxT("invalid index in wxListBox::Selected") );
 435
 436     return SendMessage(GetHwnd(), LB_GETSEL, N, 0) == 0 ? FALSE : TRUE;
 437 }
 438
 439 wxClientData* wxListBox::DoGetItemClientObject(int n) const
 440 {
 441     return (wxClientData *)DoGetItemClientData(n);
 442 }
 443
 444 void *wxListBox::DoGetItemClientData(int n) const
 445 {
 446     wxCHECK_MSG( n >= 0 && n < m_noItems, NULL,
 447                  wxT("invalid index in wxListBox::GetClientData") );
 448
 449     return (void *)SendMessage(GetHwnd(), LB_GETITEMDATA, n, 0);
 450 }
 451
 452 void wxListBox::DoSetItemClientObject(int n, wxClientData* clientData)
 453 {
 454     DoSetItemClientData(n, clientData);
 455 }
 456
 457 void wxListBox::DoSetItemClientData(int n, void *clientData)
 458 {
 459     wxCHECK_RET( n >= 0 && n < m_noItems,
 460                  wxT("invalid index in wxListBox::SetClientData") );
 461
 462 #if wxUSE_OWNER_DRAWN
 463     if ( m_windowStyle & wxLB_OWNERDRAW )
 464     {
 465         // client data must be pointer to wxOwnerDrawn, otherwise we would crash
 466         // in OnMeasure/OnDraw.
 467         wxFAIL_MSG(wxT("Can't use client data with owner-drawn listboxes"));
 468     }
 469 #endif // wxUSE_OWNER_DRAWN
 470
 471     if ( ListBox_SetItemData(GetHwnd(), n, clientData) == LB_ERR )
 472         wxLogDebug(wxT("LB_SETITEMDATA failed"));
 473 }
 474
 475 // Return number of selections and an array of selected integers
 476 int wxListBox::GetSelections(wxArrayInt& aSelections) const
 477 {
 478     aSelections.Empty();
 479
 480     if ( HasMultipleSelection() )
 481     {
 482         int countSel = ListBox_GetSelCount(GetHwnd());
 483         if ( countSel == LB_ERR )
 484         {
 485             wxLogDebug(_T("ListBox_GetSelCount failed"));
 486         }
 487         else if ( countSel != 0 )
 488         {
 489             int *selections = new int[countSel];
 490
 491             if ( ListBox_GetSelItems(GetHwnd(),
 492                                      countSel, selections) == LB_ERR )
 493             {
 494                 wxLogDebug(wxT("ListBox_GetSelItems failed"));
 495                 countSel = -1;
 496             }
 497             else
 498             {
 499                 aSelections.Alloc(countSel);
 500                 for ( int n = 0; n < countSel; n++ )
 501                     aSelections.Add(selections[n]);
 502             }
 503
 504             delete [] selections;
 505         }
 506
 507         return countSel;
 508     }
 509     else  // single-selection listbox
 510     {
 511         if (ListBox_GetCurSel(GetHwnd()) > -1)
 512             aSelections.Add(ListBox_GetCurSel(GetHwnd()));
 513
 514         return aSelections.Count();
 515     }
 516 }
 517
 518 // Get single selection, for single choice list items
 519 int wxListBox::GetSelection() const
 520 {
 521     wxCHECK_MSG( !HasMultipleSelection(),
 522                  -1,
 523                  wxT("GetSelection() can't be used with multiple-selection listboxes, use GetSelections() instead.") );
 524
 525     return ListBox_GetCurSel(GetHwnd());
 526 }
 527
 528 // Find string for position
 529 wxString wxListBox::GetString(int N) const
 530 {
 531     wxCHECK_MSG( N >= 0 && N < m_noItems, wxEmptyString,
 532                  wxT("invalid index in wxListBox::GetClientData") );
 533
 534     int len = ListBox_GetTextLen(GetHwnd(), N);
 535
 536     // +1 for terminating NUL
 537     wxString result;
 538     ListBox_GetText(GetHwnd(), N, wxStringBuffer(result, len + 1));
 539
 540     return result;
 541 }
 542
 543 void
 544 wxListBox::DoInsertItems(const wxArrayString& items, int pos)
 545 {
 546     wxCHECK_RET( pos >= 0 && pos <= m_noItems,
 547                  wxT("invalid index in wxListBox::InsertItems") );
 548
 549     int nItems = items.GetCount();
 550     for ( int i = 0; i < nItems; i++ )
 551     {
 552         int idx = ListBox_InsertString(GetHwnd(), i + pos, items[i]);
 553
 554 #if wxUSE_OWNER_DRAWN
 555         if ( m_windowStyle & wxLB_OWNERDRAW )
 556         {
 557             wxOwnerDrawn *pNewItem = CreateLboxItem(idx);
 558             pNewItem->SetName(items[i]);
 559             pNewItem->SetFont(GetFont());
 560             m_aItems.Insert(pNewItem, idx);
 561
 562             ListBox_SetItemData(GetHwnd(), idx, pNewItem);
 563         }
 564 #endif // wxUSE_OWNER_DRAWN
 565     }
 566
 567     m_noItems += nItems;
 568
 569     SetHorizontalExtent();
 570 }
 571
 572 void wxListBox::SetString(int N, const wxString& s)
 573 {
 574     wxCHECK_RET( N >= 0 && N < m_noItems,
 575                  wxT("invalid index in wxListBox::SetString") );
 576
 577     // remember the state of the item
 578     bool wasSelected = IsSelected(N);
 579
 580     void *oldData = NULL;
 581     wxClientData *oldObjData = NULL;
 582     if ( m_clientDataItemsType == wxClientData_Void )
 583         oldData = GetClientData(N);
 584     else if ( m_clientDataItemsType == wxClientData_Object )
 585         oldObjData = GetClientObject(N);
 586
 587     // delete and recreate it
 588     SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);
 589
 590     int newN = N;
 591     if ( N == m_noItems - 1 )
 592         newN = -1;
 593
 594     ListBox_InsertString(GetHwnd(), newN, s);
 595
 596     // restore the client data
 597     if ( oldData )
 598         SetClientData(N, oldData);
 599     else if ( oldObjData )
 600         SetClientObject(N, oldObjData);
 601
 602     // we may have lost the selection
 603     if ( wasSelected )
 604         Select(N);
 605
 606 #if wxUSE_OWNER_DRAWN
 607     if ( m_windowStyle & wxLB_OWNERDRAW )
 608     {
 609         // update item's text
 610         m_aItems[N]->SetName(s);
 611
 612         // reassign the item's data
 613         ListBox_SetItemData(GetHwnd(), N, m_aItems[N]);
 614     }
 615 #endif  //USE_OWNER_DRAWN
 616 }
 617
 618 int wxListBox::GetCount() const
 619 {
 620     return m_noItems;
 621 }
 622
 623 // ----------------------------------------------------------------------------
 624 // helpers
 625 // ----------------------------------------------------------------------------
 626
 627 // Windows-specific code to set the horizontal extent of the listbox, if
 628 // necessary. If s is non-NULL, it's used to calculate the horizontal extent.
 629 // Otherwise, all strings are used.
 630 void wxListBox::SetHorizontalExtent(const wxString& s)
 631 {
 632     // Only necessary if we want a horizontal scrollbar
 633     if (!(m_windowStyle & wxHSCROLL))
 634         return;
 635     TEXTMETRIC lpTextMetric;
 636
 637     if ( !s.IsEmpty() )
 638     {
 639         int existingExtent = (int)SendMessage(GetHwnd(), LB_GETHORIZONTALEXTENT, 0, 0L);
 640         HDC dc = GetWindowDC(GetHwnd());
 641         HFONT oldFont = 0;
 642         if (GetFont().Ok() && GetFont().GetResourceHandle())
 643             oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
 644
 645         GetTextMetrics(dc, &lpTextMetric);
 646         SIZE extentXY;
 647         ::GetTextExtentPoint(dc, (LPTSTR) (const wxChar *)s, s.Length(), &extentXY);
 648         int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 649
 650         if (oldFont)
 651             ::SelectObject(dc, oldFont);
 652
 653         ReleaseDC(GetHwnd(), dc);
 654         if (extentX > existingExtent)
 655             SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(extentX), 0L);
 656     }
 657     else
 658     {
 659         int largestExtent = 0;
 660         HDC dc = GetWindowDC(GetHwnd());
 661         HFONT oldFont = 0;
 662         if (GetFont().Ok() && GetFont().GetResourceHandle())
 663             oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
 664
 665         GetTextMetrics(dc, &lpTextMetric);
 666
 667         // FIXME: buffer overflow!!
 668         wxChar buf[1024];
 669         for (int i = 0; i < m_noItems; i++)
 670         {
 671             int len = (int)SendMessage(GetHwnd(), LB_GETTEXT, i, (LPARAM)buf);
 672             buf[len] = 0;
 673             SIZE extentXY;
 674             ::GetTextExtentPoint(dc, buf, len, &extentXY);
 675             int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 676             if (extentX > largestExtent)
 677                 largestExtent = extentX;
 678         }
 679         if (oldFont)
 680             ::SelectObject(dc, oldFont);
 681
 682         ReleaseDC(GetHwnd(), dc);
 683         SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(largestExtent), 0L);
 684     }
 685 }
 686
 687 wxSize wxListBox::DoGetBestSize() const
 688 {
 689     // find the widest string
 690     int wLine;
 691     int wListbox = 0;
 692     for ( int i = 0; i < m_noItems; i++ )
 693     {
 694         wxString str(GetString(i));
 695         GetTextExtent(str, &wLine, NULL);
 696         if ( wLine > wListbox )
 697             wListbox = wLine;
 698     }
 699
 700     // give it some reasonable default value if there are no strings in the
 701     // list
 702     if ( wListbox == 0 )
 703         wListbox = 100;
 704
 705     // the listbox should be slightly larger than the widest string
 706     int cx, cy;
 707     wxGetCharSize(GetHWND(), &cx, &cy, &GetFont());
 708
 709     wListbox += 3*cx;
 710
 711     // don't make the listbox too tall (limit height to 10 items) but don't
 712     // make it too small neither
 713     int hListbox = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy)*
 714                     wxMin(wxMax(m_noItems, 3), 10);
 715
 716     return wxSize(wListbox, hListbox);
 717 }
 718
 719 // ----------------------------------------------------------------------------
 720 // callbacks
 721 // ----------------------------------------------------------------------------
 722
 723 bool wxListBox::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 724 {
 725     wxEventType evtType;
 726     if ( param == LBN_SELCHANGE )
 727     {
 728         evtType = wxEVT_COMMAND_LISTBOX_SELECTED;
 729     }
 730     else if ( param == LBN_DBLCLK )
 731     {
 732         evtType = wxEVT_COMMAND_LISTBOX_DOUBLECLICKED;
 733     }
 734     else
 735     {
 736         // some event we're not interested in
 737         return FALSE;
 738     }
 739
 740     wxCommandEvent event(evtType, m_windowId);
 741     event.SetEventObject( this );
 742
 743     // retrieve the affected item
 744     int n = SendMessage(GetHwnd(), LB_GETCARETINDEX, 0, 0);
 745     if ( n != LB_ERR )
 746     {
 747         if ( HasClientObjectData() )
 748             event.SetClientObject( GetClientObject(n) );
 749         else if ( HasClientUntypedData() )
 750             event.SetClientData( GetClientData(n) );
 751
 752         event.SetString( GetString(n) );
 753         event.SetExtraLong( HasMultipleSelection() ? IsSelected(n) : TRUE );
 754     }
 755
 756     event.m_commandInt = n;
 757
 758     return GetEventHandler()->ProcessEvent(event);
 759 }
 760
 761 // ----------------------------------------------------------------------------
 762 // wxCheckListBox support
 763 // ----------------------------------------------------------------------------
 764
 765 #if wxUSE_OWNER_DRAWN
 766
 767 // drawing
 768 // -------
 769
 770 // space beneath/above each row in pixels
 771 // "standard" checklistbox use 1 here, some might prefer 2. 0 is ugly.
 772 #define OWNER_DRAWN_LISTBOX_EXTRA_SPACE    (1)
 773
 774 // the height is the same for all items
 775 // TODO should be changed for LBS_OWNERDRAWVARIABLE style listboxes
 776
 777 // NB: can't forward this to wxListBoxItem because LB_SETITEMDATA
 778 //     message is not yet sent when we get here!
 779 bool wxListBox::MSWOnMeasure(WXMEASUREITEMSTRUCT *item)
 780 {
 781     // only owner-drawn control should receive this message
 782     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), FALSE );
 783
 784     MEASUREITEMSTRUCT *pStruct = (MEASUREITEMSTRUCT *)item;
 785
 786 #ifdef __WXWINCE__
 787     HDC hdc = GetDC(NULL);
 788 #else
 789     HDC hdc = CreateIC(wxT("DISPLAY"), NULL, NULL, 0);
 790 #endif
 791
 792     wxDC dc;
 793     dc.SetHDC((WXHDC)hdc);
 794     dc.SetFont(wxSystemSettings::GetFont(wxSYS_ANSI_VAR_FONT));
 795
 796     pStruct->itemHeight = dc.GetCharHeight() + 2*OWNER_DRAWN_LISTBOX_EXTRA_SPACE;
 797     pStruct->itemWidth  = dc.GetCharWidth();
 798
 799     dc.SetHDC(0);
 800
 801     DeleteDC(hdc);
 802
 803     return TRUE;
 804 }
 805
 806 // forward the message to the appropriate item
 807 bool wxListBox::MSWOnDraw(WXDRAWITEMSTRUCT *item)
 808 {
 809     // only owner-drawn control should receive this message
 810     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), FALSE );
 811
 812     DRAWITEMSTRUCT *pStruct = (DRAWITEMSTRUCT *)item;
 813     UINT itemID = pStruct->itemID;
 814
 815     // the item may be -1 for an empty listbox
 816     if ( itemID == (UINT)-1 )
 817         return FALSE;
 818
 819     long data = ListBox_GetItemData(GetHwnd(), pStruct->itemID);
 820
 821     wxCHECK( data && (data != LB_ERR), FALSE );
 822
 823     wxListBoxItem *pItem = (wxListBoxItem *)data;
 824
 825     wxDCTemp dc((WXHDC)pStruct->hDC);
 826     wxRect rect(wxPoint(pStruct->rcItem.left, pStruct->rcItem.top),
 827                 wxPoint(pStruct->rcItem.right, pStruct->rcItem.bottom));
 828
 829     return pItem->OnDrawItem(dc, rect,
 830                              (wxOwnerDrawn::wxODAction)pStruct->itemAction,
 831                              (wxOwnerDrawn::wxODStatus)pStruct->itemState);
 832 }
 833
 834 #endif // wxUSE_OWNER_DRAWN
 835
 836 #endif // wxUSE_LISTBOX