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 #if wxUSE_EXTENDED_RTTI
  47 WX_DEFINE_FLAGS( wxListBoxStyle )
  48
  49 wxBEGIN_FLAGS( wxListBoxStyle )
  50     // new style border flags, we put them first to
  51     // use them for streaming out
  52     wxFLAGS_MEMBER(wxBORDER_SIMPLE)
  53     wxFLAGS_MEMBER(wxBORDER_SUNKEN)
  54     wxFLAGS_MEMBER(wxBORDER_DOUBLE)
  55     wxFLAGS_MEMBER(wxBORDER_RAISED)
  56     wxFLAGS_MEMBER(wxBORDER_STATIC)
  57     wxFLAGS_MEMBER(wxBORDER_NONE)
  58
  59     // old style border flags
  60     wxFLAGS_MEMBER(wxSIMPLE_BORDER)
  61     wxFLAGS_MEMBER(wxSUNKEN_BORDER)
  62     wxFLAGS_MEMBER(wxDOUBLE_BORDER)
  63     wxFLAGS_MEMBER(wxRAISED_BORDER)
  64     wxFLAGS_MEMBER(wxSTATIC_BORDER)
  65     wxFLAGS_MEMBER(wxBORDER)
  66
  67     // standard window styles
  68     wxFLAGS_MEMBER(wxTAB_TRAVERSAL)
  69     wxFLAGS_MEMBER(wxCLIP_CHILDREN)
  70     wxFLAGS_MEMBER(wxTRANSPARENT_WINDOW)
  71     wxFLAGS_MEMBER(wxWANTS_CHARS)
  72     wxFLAGS_MEMBER(wxFULL_REPAINT_ON_RESIZE)
  73     wxFLAGS_MEMBER(wxALWAYS_SHOW_SB )
  74     wxFLAGS_MEMBER(wxVSCROLL)
  75     wxFLAGS_MEMBER(wxHSCROLL)
  76
  77     wxFLAGS_MEMBER(wxLB_SINGLE)
  78     wxFLAGS_MEMBER(wxLB_MULTIPLE)
  79     wxFLAGS_MEMBER(wxLB_EXTENDED)
  80     wxFLAGS_MEMBER(wxLB_HSCROLL)
  81     wxFLAGS_MEMBER(wxLB_ALWAYS_SB)
  82     wxFLAGS_MEMBER(wxLB_NEEDED_SB)
  83     wxFLAGS_MEMBER(wxLB_SORT)
  84
  85 wxEND_FLAGS( wxListBoxStyle )
  86
  87 IMPLEMENT_DYNAMIC_CLASS_XTI(wxListBox, wxControl,"wx/listbox.h")
  88
  89 wxBEGIN_PROPERTIES_TABLE(wxListBox)
  90     wxEVENT_PROPERTY( Select , wxEVT_COMMAND_LISTBOX_SELECTED , wxCommandEvent )
  91     wxEVENT_PROPERTY( DoubleClick , wxEVT_COMMAND_LISTBOX_DOUBLECLICKED , wxCommandEvent )
  92
  93     wxPROPERTY( Font , wxFont , SetFont , GetFont  , EMPTY_MACROVALUE, 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
  94     wxPROPERTY_COLLECTION( Choices , wxArrayString , wxString , AppendString , GetStrings, 0 /*flags*/ , wxT("Helpstring") , wxT("group") )
  95     wxPROPERTY( Selection ,int, SetSelection, GetSelection, EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group") )
  96     wxPROPERTY_FLAGS( WindowStyle , wxListBoxStyle , long , SetWindowStyleFlag , GetWindowStyleFlag , EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group")) // style
  97 wxEND_PROPERTIES_TABLE()
  98
  99 wxBEGIN_HANDLERS_TABLE(wxListBox)
 100 wxEND_HANDLERS_TABLE()
 101
 102 wxCONSTRUCTOR_4( wxListBox , wxWindow* , Parent , wxWindowID , Id , wxPoint , Position , wxSize , Size )
 103 #else
 104 IMPLEMENT_DYNAMIC_CLASS(wxListBox, wxControl)
 105 #endif
 106
 107 /*
 108 TODO PROPERTIES
 109     selection
 110     content
 111         item
 112 */
 113
 114 // ============================================================================
 115 // list box item declaration and implementation
 116 // ============================================================================
 117
 118 #if wxUSE_OWNER_DRAWN
 119
 120 class wxListBoxItem : public wxOwnerDrawn
 121 {
 122 public:
 123     wxListBoxItem(const wxString& str = wxEmptyString);
 124 };
 125
 126 wxListBoxItem::wxListBoxItem(const wxString& str) : wxOwnerDrawn(str, false)
 127 {
 128     // no bitmaps/checkmarks
 129     SetMarginWidth(0);
 130 }
 131
 132 wxOwnerDrawn *wxListBox::CreateLboxItem(size_t WXUNUSED(n))
 133 {
 134     return new wxListBoxItem();
 135 }
 136
 137 #endif  //USE_OWNER_DRAWN
 138
 139 // ============================================================================
 140 // list box control implementation
 141 // ============================================================================
 142
 143 // ----------------------------------------------------------------------------
 144 // creation
 145 // ----------------------------------------------------------------------------
 146
 147 // Listbox item
 148 wxListBox::wxListBox()
 149 {
 150     m_noItems = 0;
 151     m_selected = 0;
 152 }
 153
 154 bool wxListBox::Create(wxWindow *parent,
 155                        wxWindowID id,
 156                        const wxPoint& pos,
 157                        const wxSize& size,
 158                        int n, const wxString choices[],
 159                        long style,
 160                        const wxValidator& validator,
 161                        const wxString& name)
 162 {
 163     m_noItems = 0;
 164     m_selected = 0;
 165
 166     // initialize base class fields
 167     if ( !CreateControl(parent, id, pos, size, style, validator, name) )
 168         return false;
 169
 170     // create the native control
 171     if ( !MSWCreateControl(_T("LISTBOX"), wxEmptyString, pos, size) )
 172     {
 173         // control creation failed
 174         return false;
 175     }
 176
 177     // initialize the contents
 178     for ( int i = 0; i < n; i++ )
 179     {
 180         Append(choices[i]);
 181     }
 182
 183     // now we can compute our best size correctly, so do it if necessary
 184     SetBestSize(size);
 185
 186     return true;
 187 }
 188
 189 bool wxListBox::Create(wxWindow *parent,
 190                        wxWindowID id,
 191                        const wxPoint& pos,
 192                        const wxSize& size,
 193                        const wxArrayString& choices,
 194                        long style,
 195                        const wxValidator& validator,
 196                        const wxString& name)
 197 {
 198     wxCArrayString chs(choices);
 199     return Create(parent, id, pos, size, chs.GetCount(), chs.GetStrings(),
 200                   style, validator, name);
 201 }
 202
 203 wxListBox::~wxListBox()
 204 {
 205     Free();
 206 }
 207
 208 WXDWORD wxListBox::MSWGetStyle(long style, WXDWORD *exstyle) const
 209 {
 210     WXDWORD msStyle = wxControl::MSWGetStyle(style, exstyle);
 211
 212     // always show the vertical scrollbar if necessary -- otherwise it is
 213     // impossible to use the control with the mouse
 214     msStyle |= WS_VSCROLL;
 215
 216     // we always want to get the notifications
 217     msStyle |= LBS_NOTIFY;
 218
 219     // without this style, you get unexpected heights, so e.g. constraint
 220     // layout doesn't work properly
 221     msStyle |= LBS_NOINTEGRALHEIGHT;
 222
 223     wxASSERT_MSG( !(style & wxLB_MULTIPLE) || !(style & wxLB_EXTENDED),
 224                   _T("only one of listbox selection modes can be specified") );
 225
 226     if ( style & wxLB_MULTIPLE )
 227         msStyle |= LBS_MULTIPLESEL;
 228     else if ( style & wxLB_EXTENDED )
 229         msStyle |= LBS_EXTENDEDSEL;
 230
 231     if ( m_windowStyle & wxLB_ALWAYS_SB )
 232         msStyle |= LBS_DISABLENOSCROLL;
 233     if ( m_windowStyle & wxLB_HSCROLL )
 234         msStyle |= WS_HSCROLL;
 235     if ( m_windowStyle & wxLB_SORT )
 236         msStyle |= LBS_SORT;
 237
 238 #if wxUSE_OWNER_DRAWN && !defined(__WXWINCE__)
 239     if ( m_windowStyle & wxLB_OWNERDRAW )
 240     {
 241         // we don't support LBS_OWNERDRAWVARIABLE yet and we also always put
 242         // the strings in the listbox for simplicity even though we could have
 243         // avoided it in this case
 244         msStyle |= LBS_OWNERDRAWFIXED | LBS_HASSTRINGS;
 245     }
 246 #endif // wxUSE_OWNER_DRAWN
 247
 248     return msStyle;
 249 }
 250
 251 // ----------------------------------------------------------------------------
 252 // implementation of wxListBoxBase methods
 253 // ----------------------------------------------------------------------------
 254
 255 void wxListBox::DoSetFirstItem(int N)
 256 {
 257     wxCHECK_RET( N >= 0 && N < m_noItems,
 258                  wxT("invalid index in wxListBox::SetFirstItem") );
 259
 260     SendMessage(GetHwnd(), LB_SETTOPINDEX, (WPARAM)N, (LPARAM)0);
 261 }
 262
 263 void wxListBox::Delete(int N)
 264 {
 265     wxCHECK_RET( N >= 0 && N < m_noItems,
 266                  wxT("invalid index in wxListBox::Delete") );
 267
 268     // for owner drawn objects, the data is used for storing wxOwnerDrawn
 269     // pointers and we shouldn't touch it
 270 #if !wxUSE_OWNER_DRAWN
 271     if ( !(m_windowStyle & wxLB_OWNERDRAW) )
 272 #endif // !wxUSE_OWNER_DRAWN
 273         if ( HasClientObjectData() )
 274         {
 275             delete GetClientObject(N);
 276         }
 277
 278     SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);
 279     m_noItems--;
 280
 281     SetHorizontalExtent(wxEmptyString);
 282 }
 283
 284 int wxListBox::DoAppend(const wxString& item)
 285 {
 286     InvalidateBestSize();
 287
 288     int index = ListBox_AddString(GetHwnd(), item);
 289     m_noItems++;
 290
 291 #if wxUSE_OWNER_DRAWN
 292     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 293         wxOwnerDrawn *pNewItem = CreateLboxItem(index); // dummy argument
 294         pNewItem->SetName(item);
 295         m_aItems.Insert(pNewItem, index);
 296         ListBox_SetItemData(GetHwnd(), index, pNewItem);
 297         pNewItem->SetFont(GetFont());
 298     }
 299 #endif // wxUSE_OWNER_DRAWN
 300
 301     SetHorizontalExtent(item);
 302
 303     return index;
 304 }
 305
 306 void wxListBox::DoSetItems(const wxArrayString& choices, void** clientData)
 307 {
 308     // avoid flicker - but don't need to do this for a hidden listbox
 309     bool hideAndShow = IsShown();
 310     if ( hideAndShow )
 311     {
 312         ShowWindow(GetHwnd(), SW_HIDE);
 313     }
 314
 315     ListBox_ResetContent(GetHwnd());
 316
 317     m_noItems = choices.GetCount();
 318     int i;
 319     for (i = 0; i < m_noItems; i++)
 320     {
 321         ListBox_AddString(GetHwnd(), choices[i]);
 322         if ( clientData )
 323         {
 324             SetClientData(i, clientData[i]);
 325         }
 326     }
 327
 328 #if wxUSE_OWNER_DRAWN
 329     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 330         // first delete old items
 331         WX_CLEAR_ARRAY(m_aItems);
 332
 333         // then create new ones
 334         for ( size_t ui = 0; ui < (size_t)m_noItems; ui++ ) {
 335             wxOwnerDrawn *pNewItem = CreateLboxItem(ui);
 336             pNewItem->SetName(choices[ui]);
 337             m_aItems.Add(pNewItem);
 338             ListBox_SetItemData(GetHwnd(), ui, pNewItem);
 339         }
 340     }
 341 #endif // wxUSE_OWNER_DRAWN
 342
 343     SetHorizontalExtent();
 344
 345     if ( hideAndShow )
 346     {
 347         // show the listbox back if we hid it
 348         ShowWindow(GetHwnd(), SW_SHOW);
 349     }
 350 }
 351
 352 int wxListBox::FindString(const wxString& s) const
 353 {
 354     int pos = ListBox_FindStringExact(GetHwnd(), (WPARAM)-1, s);
 355     if (pos == LB_ERR)
 356         return wxNOT_FOUND;
 357     else
 358         return pos;
 359 }
 360
 361 void wxListBox::Clear()
 362 {
 363     Free();
 364
 365     ListBox_ResetContent(GetHwnd());
 366
 367     m_noItems = 0;
 368     SetHorizontalExtent();
 369 }
 370
 371 void wxListBox::Free()
 372 {
 373 #if wxUSE_OWNER_DRAWN
 374     if ( m_windowStyle & wxLB_OWNERDRAW )
 375     {
 376         WX_CLEAR_ARRAY(m_aItems);
 377     }
 378     else
 379 #endif // wxUSE_OWNER_DRAWN
 380     if ( HasClientObjectData() )
 381     {
 382         for ( size_t n = 0; n < (size_t)m_noItems; n++ )
 383         {
 384             delete GetClientObject(n);
 385         }
 386     }
 387 }
 388
 389 void wxListBox::DoSetSelection(int N, bool select)
 390 {
 391     wxCHECK_RET( N == wxNOT_FOUND ||
 392                     (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, wxEmptyString,
 506                  wxT("invalid index in wxListBox::GetString") );
 507
 508     int len = ListBox_GetTextLen(GetHwnd(), N);
 509
 510     // +1 for terminating NUL
 511     wxString result;
 512     ListBox_GetText(GetHwnd(), N, (wxChar*)wxStringBuffer(result, len + 1));
 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     InvalidateBestSize();
 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.empty() )
 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() != 0)
 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() != 0)
 641             oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
 642
 643         GetTextMetrics(dc, &lpTextMetric);
 644
 645         for (int i = 0; i < m_noItems; i++)
 646         {
 647             wxString str = GetString(i);
 648             SIZE extentXY;
 649             ::GetTextExtentPoint(dc, str.c_str(), str.length(), &extentXY);
 650             int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 651             if (extentX > largestExtent)
 652                 largestExtent = extentX;
 653         }
 654         if (oldFont)
 655             ::SelectObject(dc, oldFont);
 656
 657         ReleaseDC(GetHwnd(), dc);
 658         SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(largestExtent), 0L);
 659     }
 660 }
 661
 662 wxSize wxListBox::DoGetBestSize() const
 663 {
 664     // find the widest string
 665     int wLine;
 666     int wListbox = 0;
 667     for ( int i = 0; i < m_noItems; i++ )
 668     {
 669         wxString str(GetString(i));
 670         GetTextExtent(str, &wLine, NULL);
 671         if ( wLine > wListbox )
 672             wListbox = wLine;
 673     }
 674
 675     // give it some reasonable default value if there are no strings in the
 676     // list
 677     if ( wListbox == 0 )
 678         wListbox = 100;
 679
 680     // the listbox should be slightly larger than the widest string
 681     int cx, cy;
 682     wxGetCharSize(GetHWND(), &cx, &cy, GetFont());
 683
 684     wListbox += 3*cx;
 685
 686     // Add room for the scrollbar
 687     wListbox += wxSystemSettings::GetMetric(wxSYS_VSCROLL_X);
 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.SetInt(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(GetFont());
 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     wxPoint pt1(pStruct->rcItem.left, pStruct->rcItem.top);
 805     wxPoint pt2(pStruct->rcItem.right, pStruct->rcItem.bottom);
 806     wxRect rect(pt1, pt2);
 807
 808     return pItem->OnDrawItem(dc, rect,
 809                              (wxOwnerDrawn::wxODAction)pStruct->itemAction,
 810                              (wxOwnerDrawn::wxODStatus)pStruct->itemState);
 811 }
 812
 813 #endif // wxUSE_OWNER_DRAWN
 814
 815 #endif // wxUSE_LISTBOX