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  , EMPTY_MACROVALUE, 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, EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group") )
 100     wxPROPERTY_FLAGS( WindowStyle , wxListBoxStyle , long , SetWindowStyleFlag , GetWindowStyleFlag , EMPTY_MACROVALUE , 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& validator,
 165                        const wxString& name)
 166 {
 167     m_noItems = 0;
 168     m_selected = 0;
 169
 170     // initialize base class fields
 171     if ( !CreateControl(parent, id, pos, size, style, validator, name) )
 172         return false;
 173
 174     // create the native control
 175     if ( !MSWCreateControl(_T("LISTBOX"), wxEmptyString, pos, size) )
 176     {
 177         // control creation failed
 178         return false;
 179     }
 180
 181     // initialize the contents
 182     for ( int i = 0; i < n; i++ )
 183     {
 184         Append(choices[i]);
 185     }
 186
 187     // now we can compute our best size correctly, so do it if necessary
 188     SetBestSize(size);
 189
 190     return true;
 191 }
 192
 193 bool wxListBox::Create(wxWindow *parent,
 194                        wxWindowID id,
 195                        const wxPoint& pos,
 196                        const wxSize& size,
 197                        const wxArrayString& choices,
 198                        long style,
 199                        const wxValidator& validator,
 200                        const wxString& name)
 201 {
 202     wxCArrayString chs(choices);
 203     return Create(parent, id, pos, size, chs.GetCount(), chs.GetStrings(),
 204                   style, validator, name);
 205 }
 206
 207 wxListBox::~wxListBox()
 208 {
 209     Free();
 210 }
 211
 212 WXDWORD wxListBox::MSWGetStyle(long style, WXDWORD *exstyle) const
 213 {
 214     WXDWORD msStyle = wxControl::MSWGetStyle(style, exstyle);
 215
 216     // always show the vertical scrollbar if necessary -- otherwise it is
 217     // impossible to use the control with the mouse
 218     msStyle |= WS_VSCROLL;
 219
 220     // we always want to get the notifications
 221     msStyle |= LBS_NOTIFY;
 222
 223     // without this style, you get unexpected heights, so e.g. constraint
 224     // layout doesn't work properly
 225     msStyle |= LBS_NOINTEGRALHEIGHT;
 226
 227     wxASSERT_MSG( !(style & wxLB_MULTIPLE) || !(style & wxLB_EXTENDED),
 228                   _T("only one of listbox selection modes can be specified") );
 229
 230     if ( style & wxLB_MULTIPLE )
 231         msStyle |= LBS_MULTIPLESEL;
 232     else if ( style & wxLB_EXTENDED )
 233         msStyle |= LBS_EXTENDEDSEL;
 234
 235     if ( m_windowStyle & wxLB_ALWAYS_SB )
 236         msStyle |= LBS_DISABLENOSCROLL;
 237     if ( m_windowStyle & wxLB_HSCROLL )
 238         msStyle |= WS_HSCROLL;
 239     if ( m_windowStyle & wxLB_SORT )
 240         msStyle |= LBS_SORT;
 241
 242 #if wxUSE_OWNER_DRAWN && !defined(__WXWINCE__)
 243     if ( m_windowStyle & wxLB_OWNERDRAW )
 244     {
 245         // we don't support LBS_OWNERDRAWVARIABLE yet and we also always put
 246         // the strings in the listbox for simplicity even though we could have
 247         // avoided it in this case
 248         msStyle |= LBS_OWNERDRAWFIXED | LBS_HASSTRINGS;
 249     }
 250 #endif // wxUSE_OWNER_DRAWN
 251
 252     return msStyle;
 253 }
 254
 255 // ----------------------------------------------------------------------------
 256 // implementation of wxListBoxBase methods
 257 // ----------------------------------------------------------------------------
 258
 259 void wxListBox::DoSetFirstItem(int N)
 260 {
 261     wxCHECK_RET( N >= 0 && N < m_noItems,
 262                  wxT("invalid index in wxListBox::SetFirstItem") );
 263
 264     SendMessage(GetHwnd(), LB_SETTOPINDEX, (WPARAM)N, (LPARAM)0);
 265 }
 266
 267 void wxListBox::Delete(int N)
 268 {
 269     wxCHECK_RET( N >= 0 && N < m_noItems,
 270                  wxT("invalid index in wxListBox::Delete") );
 271
 272     // for owner drawn objects, the data is used for storing wxOwnerDrawn
 273     // pointers and we shouldn't touch it
 274 #if !wxUSE_OWNER_DRAWN
 275     if ( !(m_windowStyle & wxLB_OWNERDRAW) )
 276 #endif // !wxUSE_OWNER_DRAWN
 277         if ( HasClientObjectData() )
 278         {
 279             delete GetClientObject(N);
 280         }
 281
 282     SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);
 283     m_noItems--;
 284
 285     SetHorizontalExtent(wxEmptyString);
 286 }
 287
 288 int wxListBox::DoAppend(const wxString& item)
 289 {
 290     int index = ListBox_AddString(GetHwnd(), item);
 291     m_noItems++;
 292
 293 #if wxUSE_OWNER_DRAWN
 294     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 295         wxOwnerDrawn *pNewItem = CreateLboxItem(index); // dummy argument
 296         pNewItem->SetName(item);
 297         m_aItems.Insert(pNewItem, index);
 298         ListBox_SetItemData(GetHwnd(), index, pNewItem);
 299         pNewItem->SetFont(GetFont());
 300     }
 301 #endif // wxUSE_OWNER_DRAWN
 302
 303     SetHorizontalExtent(item);
 304
 305     return index;
 306 }
 307
 308 void wxListBox::DoSetItems(const wxArrayString& choices, void** clientData)
 309 {
 310     // avoid flicker - but don't need to do this for a hidden listbox
 311     bool hideAndShow = IsShown();
 312     if ( hideAndShow )
 313     {
 314         ShowWindow(GetHwnd(), SW_HIDE);
 315     }
 316
 317     ListBox_ResetContent(GetHwnd());
 318
 319     m_noItems = choices.GetCount();
 320     int i;
 321     for (i = 0; i < m_noItems; i++)
 322     {
 323         ListBox_AddString(GetHwnd(), choices[i]);
 324         if ( clientData )
 325         {
 326             SetClientData(i, clientData[i]);
 327         }
 328     }
 329
 330 #if wxUSE_OWNER_DRAWN
 331     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 332         // first delete old items
 333         WX_CLEAR_ARRAY(m_aItems);
 334
 335         // then create new ones
 336         for ( size_t ui = 0; ui < (size_t)m_noItems; ui++ ) {
 337             wxOwnerDrawn *pNewItem = CreateLboxItem(ui);
 338             pNewItem->SetName(choices[ui]);
 339             m_aItems.Add(pNewItem);
 340             ListBox_SetItemData(GetHwnd(), ui, pNewItem);
 341         }
 342     }
 343 #endif // wxUSE_OWNER_DRAWN
 344
 345     SetHorizontalExtent();
 346
 347     if ( hideAndShow )
 348     {
 349         // show the listbox back if we hid it
 350         ShowWindow(GetHwnd(), SW_SHOW);
 351     }
 352 }
 353
 354 int wxListBox::FindString(const wxString& s) const
 355 {
 356     int pos = ListBox_FindStringExact(GetHwnd(), (WPARAM)-1, s);
 357     if (pos == LB_ERR)
 358         return wxNOT_FOUND;
 359     else
 360         return pos;
 361 }
 362
 363 void wxListBox::Clear()
 364 {
 365     Free();
 366
 367     ListBox_ResetContent(GetHwnd());
 368
 369     m_noItems = 0;
 370     SetHorizontalExtent();
 371 }
 372
 373 void wxListBox::Free()
 374 {
 375 #if wxUSE_OWNER_DRAWN
 376     if ( m_windowStyle & wxLB_OWNERDRAW )
 377     {
 378         WX_CLEAR_ARRAY(m_aItems);
 379     }
 380     else
 381 #endif // wxUSE_OWNER_DRAWN
 382     if ( HasClientObjectData() )
 383     {
 384         for ( size_t n = 0; n < (size_t)m_noItems; n++ )
 385         {
 386             delete GetClientObject(n);
 387         }
 388     }
 389 }
 390
 391 void wxListBox::SetSelection(int N, bool select)
 392 {
 393     wxCHECK_RET( N == wxNOT_FOUND ||
 394                     (N >= 0 && N < m_noItems),
 395                  wxT("invalid index in wxListBox::SetSelection") );
 396
 397     if ( HasMultipleSelection() )
 398     {
 399         SendMessage(GetHwnd(), LB_SETSEL, select, N);
 400     }
 401     else
 402     {
 403         SendMessage(GetHwnd(), LB_SETCURSEL, select ? N : -1, 0);
 404     }
 405 }
 406
 407 bool wxListBox::IsSelected(int N) const
 408 {
 409     wxCHECK_MSG( N >= 0 && N < m_noItems, FALSE,
 410                  wxT("invalid index in wxListBox::Selected") );
 411
 412     return SendMessage(GetHwnd(), LB_GETSEL, N, 0) == 0 ? FALSE : TRUE;
 413 }
 414
 415 wxClientData* wxListBox::DoGetItemClientObject(int n) const
 416 {
 417     return (wxClientData *)DoGetItemClientData(n);
 418 }
 419
 420 void *wxListBox::DoGetItemClientData(int n) const
 421 {
 422     wxCHECK_MSG( n >= 0 && n < m_noItems, NULL,
 423                  wxT("invalid index in wxListBox::GetClientData") );
 424
 425     return (void *)SendMessage(GetHwnd(), LB_GETITEMDATA, n, 0);
 426 }
 427
 428 void wxListBox::DoSetItemClientObject(int n, wxClientData* clientData)
 429 {
 430     DoSetItemClientData(n, clientData);
 431 }
 432
 433 void wxListBox::DoSetItemClientData(int n, void *clientData)
 434 {
 435     wxCHECK_RET( n >= 0 && n < m_noItems,
 436                  wxT("invalid index in wxListBox::SetClientData") );
 437
 438 #if wxUSE_OWNER_DRAWN
 439     if ( m_windowStyle & wxLB_OWNERDRAW )
 440     {
 441         // client data must be pointer to wxOwnerDrawn, otherwise we would crash
 442         // in OnMeasure/OnDraw.
 443         wxFAIL_MSG(wxT("Can't use client data with owner-drawn listboxes"));
 444     }
 445 #endif // wxUSE_OWNER_DRAWN
 446
 447     if ( ListBox_SetItemData(GetHwnd(), n, clientData) == LB_ERR )
 448         wxLogDebug(wxT("LB_SETITEMDATA failed"));
 449 }
 450
 451 // Return number of selections and an array of selected integers
 452 int wxListBox::GetSelections(wxArrayInt& aSelections) const
 453 {
 454     aSelections.Empty();
 455
 456     if ( HasMultipleSelection() )
 457     {
 458         int countSel = ListBox_GetSelCount(GetHwnd());
 459         if ( countSel == LB_ERR )
 460         {
 461             wxLogDebug(_T("ListBox_GetSelCount failed"));
 462         }
 463         else if ( countSel != 0 )
 464         {
 465             int *selections = new int[countSel];
 466
 467             if ( ListBox_GetSelItems(GetHwnd(),
 468                                      countSel, selections) == LB_ERR )
 469             {
 470                 wxLogDebug(wxT("ListBox_GetSelItems failed"));
 471                 countSel = -1;
 472             }
 473             else
 474             {
 475                 aSelections.Alloc(countSel);
 476                 for ( int n = 0; n < countSel; n++ )
 477                     aSelections.Add(selections[n]);
 478             }
 479
 480             delete [] selections;
 481         }
 482
 483         return countSel;
 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, wxEmptyString,
 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, wxStringBuffer(result, len + 1));
 515
 516     return result;
 517 }
 518
 519 void
 520 wxListBox::DoInsertItems(const wxArrayString& items, int pos)
 521 {
 522     wxCHECK_RET( pos >= 0 && pos <= m_noItems,
 523                  wxT("invalid index in wxListBox::InsertItems") );
 524
 525     int nItems = items.GetCount();
 526     for ( int i = 0; i < nItems; i++ )
 527     {
 528         int idx = ListBox_InsertString(GetHwnd(), i + pos, items[i]);
 529
 530 #if wxUSE_OWNER_DRAWN
 531         if ( m_windowStyle & wxLB_OWNERDRAW )
 532         {
 533             wxOwnerDrawn *pNewItem = CreateLboxItem(idx);
 534             pNewItem->SetName(items[i]);
 535             pNewItem->SetFont(GetFont());
 536             m_aItems.Insert(pNewItem, idx);
 537
 538             ListBox_SetItemData(GetHwnd(), idx, pNewItem);
 539         }
 540 #else
 541         wxUnusedVar(idx);
 542 #endif // wxUSE_OWNER_DRAWN
 543     }
 544
 545     m_noItems += nItems;
 546
 547     SetHorizontalExtent();
 548 }
 549
 550 void wxListBox::SetString(int N, const wxString& s)
 551 {
 552     wxCHECK_RET( N >= 0 && N < m_noItems,
 553                  wxT("invalid index in wxListBox::SetString") );
 554
 555     // remember the state of the item
 556     bool wasSelected = IsSelected(N);
 557
 558     void *oldData = NULL;
 559     wxClientData *oldObjData = NULL;
 560     if ( m_clientDataItemsType == wxClientData_Void )
 561         oldData = GetClientData(N);
 562     else if ( m_clientDataItemsType == wxClientData_Object )
 563         oldObjData = GetClientObject(N);
 564
 565     // delete and recreate it
 566     SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);
 567
 568     int newN = N;
 569     if ( N == m_noItems - 1 )
 570         newN = -1;
 571
 572     ListBox_InsertString(GetHwnd(), newN, s);
 573
 574     // restore the client data
 575     if ( oldData )
 576         SetClientData(N, oldData);
 577     else if ( oldObjData )
 578         SetClientObject(N, oldObjData);
 579
 580 #if wxUSE_OWNER_DRAWN
 581     if ( m_windowStyle & wxLB_OWNERDRAW )
 582     {
 583         // update item's text
 584         m_aItems[N]->SetName(s);
 585
 586         // reassign the item's data
 587         ListBox_SetItemData(GetHwnd(), N, m_aItems[N]);
 588     }
 589 #endif  //USE_OWNER_DRAWN
 590
 591     // we may have lost the selection
 592     if ( wasSelected )
 593         Select(N);
 594 }
 595
 596 int wxListBox::GetCount() const
 597 {
 598     return m_noItems;
 599 }
 600
 601 // ----------------------------------------------------------------------------
 602 // helpers
 603 // ----------------------------------------------------------------------------
 604
 605 // Windows-specific code to set the horizontal extent of the listbox, if
 606 // necessary. If s is non-NULL, it's used to calculate the horizontal extent.
 607 // Otherwise, all strings are used.
 608 void wxListBox::SetHorizontalExtent(const wxString& s)
 609 {
 610     // Only necessary if we want a horizontal scrollbar
 611     if (!(m_windowStyle & wxHSCROLL))
 612         return;
 613     TEXTMETRIC lpTextMetric;
 614
 615     if ( !s.IsEmpty() )
 616     {
 617         int existingExtent = (int)SendMessage(GetHwnd(), LB_GETHORIZONTALEXTENT, 0, 0L);
 618         HDC dc = GetWindowDC(GetHwnd());
 619         HFONT oldFont = 0;
 620         if (GetFont().Ok() && GetFont().GetResourceHandle())
 621             oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
 622
 623         GetTextMetrics(dc, &lpTextMetric);
 624         SIZE extentXY;
 625         ::GetTextExtentPoint(dc, (LPTSTR) (const wxChar *)s, s.Length(), &extentXY);
 626         int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 627
 628         if (oldFont)
 629             ::SelectObject(dc, oldFont);
 630
 631         ReleaseDC(GetHwnd(), dc);
 632         if (extentX > existingExtent)
 633             SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(extentX), 0L);
 634     }
 635     else
 636     {
 637         int largestExtent = 0;
 638         HDC dc = GetWindowDC(GetHwnd());
 639         HFONT oldFont = 0;
 640         if (GetFont().Ok() && GetFont().GetResourceHandle())
 641             oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
 642
 643         GetTextMetrics(dc, &lpTextMetric);
 644
 645         // FIXME: buffer overflow!!
 646         wxChar buf[1024];
 647         for (int i = 0; i < m_noItems; i++)
 648         {
 649             int len = (int)SendMessage(GetHwnd(), LB_GETTEXT, i, (LPARAM)buf);
 650             buf[len] = 0;
 651             SIZE extentXY;
 652             ::GetTextExtentPoint(dc, buf, len, &extentXY);
 653             int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 654             if (extentX > largestExtent)
 655                 largestExtent = extentX;
 656         }
 657         if (oldFont)
 658             ::SelectObject(dc, oldFont);
 659
 660         ReleaseDC(GetHwnd(), dc);
 661         SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(largestExtent), 0L);
 662     }
 663 }
 664
 665 wxSize wxListBox::DoGetBestSize() const
 666 {
 667     // find the widest string
 668     int wLine;
 669     int wListbox = 0;
 670     for ( int i = 0; i < m_noItems; i++ )
 671     {
 672         wxString str(GetString(i));
 673         GetTextExtent(str, &wLine, NULL);
 674         if ( wLine > wListbox )
 675             wListbox = wLine;
 676     }
 677
 678     // give it some reasonable default value if there are no strings in the
 679     // list
 680     if ( wListbox == 0 )
 681         wListbox = 100;
 682
 683     // the listbox should be slightly larger than the widest string
 684     int cx, cy;
 685     wxGetCharSize(GetHWND(), &cx, &cy, GetFont());
 686
 687     wListbox += 3*cx;
 688
 689     // don't make the listbox too tall (limit height to 10 items) but don't
 690     // make it too small neither
 691     int hListbox = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy)*
 692                     wxMin(wxMax(m_noItems, 3), 10);
 693
 694     return wxSize(wListbox, hListbox);
 695 }
 696
 697 // ----------------------------------------------------------------------------
 698 // callbacks
 699 // ----------------------------------------------------------------------------
 700
 701 bool wxListBox::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 702 {
 703     wxEventType evtType;
 704     if ( param == LBN_SELCHANGE )
 705     {
 706         evtType = wxEVT_COMMAND_LISTBOX_SELECTED;
 707     }
 708     else if ( param == LBN_DBLCLK )
 709     {
 710         evtType = wxEVT_COMMAND_LISTBOX_DOUBLECLICKED;
 711     }
 712     else
 713     {
 714         // some event we're not interested in
 715         return FALSE;
 716     }
 717
 718     wxCommandEvent event(evtType, m_windowId);
 719     event.SetEventObject( this );
 720
 721     // retrieve the affected item
 722     int n = SendMessage(GetHwnd(), LB_GETCARETINDEX, 0, 0);
 723     if ( n != LB_ERR )
 724     {
 725         if ( HasClientObjectData() )
 726             event.SetClientObject( GetClientObject(n) );
 727         else if ( HasClientUntypedData() )
 728             event.SetClientData( GetClientData(n) );
 729
 730         event.SetString( GetString(n) );
 731         event.SetExtraLong( HasMultipleSelection() ? IsSelected(n) : TRUE );
 732     }
 733
 734     event.m_commandInt = n;
 735
 736     return GetEventHandler()->ProcessEvent(event);
 737 }
 738
 739 // ----------------------------------------------------------------------------
 740 // wxCheckListBox support
 741 // ----------------------------------------------------------------------------
 742
 743 #if wxUSE_OWNER_DRAWN
 744
 745 // drawing
 746 // -------
 747
 748 // space beneath/above each row in pixels
 749 // "standard" checklistbox use 1 here, some might prefer 2. 0 is ugly.
 750 #define OWNER_DRAWN_LISTBOX_EXTRA_SPACE    (1)
 751
 752 // the height is the same for all items
 753 // TODO should be changed for LBS_OWNERDRAWVARIABLE style listboxes
 754
 755 // NB: can't forward this to wxListBoxItem because LB_SETITEMDATA
 756 //     message is not yet sent when we get here!
 757 bool wxListBox::MSWOnMeasure(WXMEASUREITEMSTRUCT *item)
 758 {
 759     // only owner-drawn control should receive this message
 760     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), FALSE );
 761
 762     MEASUREITEMSTRUCT *pStruct = (MEASUREITEMSTRUCT *)item;
 763
 764 #ifdef __WXWINCE__
 765     HDC hdc = GetDC(NULL);
 766 #else
 767     HDC hdc = CreateIC(wxT("DISPLAY"), NULL, NULL, 0);
 768 #endif
 769
 770     wxDC dc;
 771     dc.SetHDC((WXHDC)hdc);
 772     dc.SetFont(wxSystemSettings::GetFont(wxSYS_ANSI_VAR_FONT));
 773
 774     pStruct->itemHeight = dc.GetCharHeight() + 2*OWNER_DRAWN_LISTBOX_EXTRA_SPACE;
 775     pStruct->itemWidth  = dc.GetCharWidth();
 776
 777     dc.SetHDC(0);
 778
 779     DeleteDC(hdc);
 780
 781     return TRUE;
 782 }
 783
 784 // forward the message to the appropriate item
 785 bool wxListBox::MSWOnDraw(WXDRAWITEMSTRUCT *item)
 786 {
 787     // only owner-drawn control should receive this message
 788     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), FALSE );
 789
 790     DRAWITEMSTRUCT *pStruct = (DRAWITEMSTRUCT *)item;
 791     UINT itemID = pStruct->itemID;
 792
 793     // the item may be -1 for an empty listbox
 794     if ( itemID == (UINT)-1 )
 795         return FALSE;
 796
 797     long data = ListBox_GetItemData(GetHwnd(), pStruct->itemID);
 798
 799     wxCHECK( data && (data != LB_ERR), FALSE );
 800
 801     wxListBoxItem *pItem = (wxListBoxItem *)data;
 802
 803     wxDCTemp dc((WXHDC)pStruct->hDC);
 804     wxRect rect(wxPoint(pStruct->rcItem.left, pStruct->rcItem.top),
 805                 wxPoint(pStruct->rcItem.right, pStruct->rcItem.bottom));
 806
 807     return pItem->OnDrawItem(dc, rect,
 808                              (wxOwnerDrawn::wxODAction)pStruct->itemAction,
 809                              (wxOwnerDrawn::wxODStatus)pStruct->itemState);
 810 }
 811
 812 #endif // wxUSE_OWNER_DRAWN
 813
 814 #endif // wxUSE_LISTBOX