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 wxListBox::~wxListBox()
 255 {
 256     Free();
 257 }
 258
 259 void wxListBox::SetupColours()
 260 {
 261     SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW));
 262     SetForegroundColour(GetParent()->GetForegroundColour());
 263 }
 264
 265 // ----------------------------------------------------------------------------
 266 // implementation of wxListBoxBase methods
 267 // ----------------------------------------------------------------------------
 268
 269 void wxListBox::DoSetFirstItem(int N)
 270 {
 271     wxCHECK_RET( N >= 0 && N < m_noItems,
 272                  wxT("invalid index in wxListBox::SetFirstItem") );
 273
 274     SendMessage(GetHwnd(), LB_SETTOPINDEX, (WPARAM)N, (LPARAM)0);
 275 }
 276
 277 void wxListBox::Delete(int N)
 278 {
 279     wxCHECK_RET( N >= 0 && N < m_noItems,
 280                  wxT("invalid index in wxListBox::Delete") );
 281
 282     // for owner drawn objects, the data is used for storing wxOwnerDrawn
 283     // pointers and we shouldn't touch it
 284 #if !wxUSE_OWNER_DRAWN
 285     if ( !(m_windowStyle & wxLB_OWNERDRAW) )
 286 #endif // !wxUSE_OWNER_DRAWN
 287         if ( HasClientObjectData() )
 288         {
 289             delete GetClientObject(N);
 290         }
 291
 292     SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);
 293     m_noItems--;
 294
 295     SetHorizontalExtent(wxEmptyString);
 296 }
 297
 298 int wxListBox::DoAppend(const wxString& item)
 299 {
 300     int index = ListBox_AddString(GetHwnd(), item);
 301     m_noItems++;
 302
 303 #if wxUSE_OWNER_DRAWN
 304     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 305         wxOwnerDrawn *pNewItem = CreateLboxItem(index); // dummy argument
 306         pNewItem->SetName(item);
 307         m_aItems.Insert(pNewItem, index);
 308         ListBox_SetItemData(GetHwnd(), index, pNewItem);
 309         pNewItem->SetFont(GetFont());
 310     }
 311 #endif // wxUSE_OWNER_DRAWN
 312
 313     SetHorizontalExtent(item);
 314
 315     return index;
 316 }
 317
 318 void wxListBox::DoSetItems(const wxArrayString& choices, void** clientData)
 319 {
 320     // avoid flicker - but don't need to do this for a hidden listbox
 321     bool hideAndShow = IsShown();
 322     if ( hideAndShow )
 323     {
 324         ShowWindow(GetHwnd(), SW_HIDE);
 325     }
 326
 327     ListBox_ResetContent(GetHwnd());
 328
 329     m_noItems = choices.GetCount();
 330     int i;
 331     for (i = 0; i < m_noItems; i++)
 332     {
 333         ListBox_AddString(GetHwnd(), choices[i]);
 334         if ( clientData )
 335         {
 336             SetClientData(i, clientData[i]);
 337         }
 338     }
 339
 340 #if wxUSE_OWNER_DRAWN
 341     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 342         // first delete old items
 343         WX_CLEAR_ARRAY(m_aItems);
 344
 345         // then create new ones
 346         for ( size_t ui = 0; ui < (size_t)m_noItems; ui++ ) {
 347             wxOwnerDrawn *pNewItem = CreateLboxItem(ui);
 348             pNewItem->SetName(choices[ui]);
 349             m_aItems.Add(pNewItem);
 350             ListBox_SetItemData(GetHwnd(), ui, pNewItem);
 351         }
 352     }
 353 #endif // wxUSE_OWNER_DRAWN
 354
 355     SetHorizontalExtent();
 356
 357     if ( hideAndShow )
 358     {
 359         // show the listbox back if we hid it
 360         ShowWindow(GetHwnd(), SW_SHOW);
 361     }
 362 }
 363
 364 int wxListBox::FindString(const wxString& s) const
 365 {
 366     int pos = ListBox_FindStringExact(GetHwnd(), (WPARAM)-1, s);
 367     if (pos == LB_ERR)
 368         return wxNOT_FOUND;
 369     else
 370         return pos;
 371 }
 372
 373 void wxListBox::Clear()
 374 {
 375     Free();
 376
 377     ListBox_ResetContent(GetHwnd());
 378
 379     m_noItems = 0;
 380     SetHorizontalExtent();
 381 }
 382
 383 void wxListBox::Free()
 384 {
 385 #if wxUSE_OWNER_DRAWN
 386     if ( m_windowStyle & wxLB_OWNERDRAW )
 387     {
 388         WX_CLEAR_ARRAY(m_aItems);
 389     }
 390     else
 391 #endif // wxUSE_OWNER_DRAWN
 392     if ( HasClientObjectData() )
 393     {
 394         for ( size_t n = 0; n < (size_t)m_noItems; n++ )
 395         {
 396             delete GetClientObject(n);
 397         }
 398     }
 399 }
 400
 401 void wxListBox::SetSelection(int N, bool select)
 402 {
 403     wxCHECK_RET( N >= 0 && N < m_noItems,
 404                  wxT("invalid index in wxListBox::SetSelection") );
 405
 406     if ( HasMultipleSelection() )
 407     {
 408         SendMessage(GetHwnd(), LB_SETSEL, select, N);
 409     }
 410     else
 411     {
 412         SendMessage(GetHwnd(), LB_SETCURSEL, select ? N : -1, 0);
 413     }
 414 }
 415
 416 bool wxListBox::IsSelected(int N) const
 417 {
 418     wxCHECK_MSG( N >= 0 && N < m_noItems, FALSE,
 419                  wxT("invalid index in wxListBox::Selected") );
 420
 421     return SendMessage(GetHwnd(), LB_GETSEL, N, 0) == 0 ? FALSE : TRUE;
 422 }
 423
 424 wxClientData* wxListBox::DoGetItemClientObject(int n) const
 425 {
 426     return (wxClientData *)DoGetItemClientData(n);
 427 }
 428
 429 void *wxListBox::DoGetItemClientData(int n) const
 430 {
 431     wxCHECK_MSG( n >= 0 && n < m_noItems, NULL,
 432                  wxT("invalid index in wxListBox::GetClientData") );
 433
 434     return (void *)SendMessage(GetHwnd(), LB_GETITEMDATA, n, 0);
 435 }
 436
 437 void wxListBox::DoSetItemClientObject(int n, wxClientData* clientData)
 438 {
 439     DoSetItemClientData(n, clientData);
 440 }
 441
 442 void wxListBox::DoSetItemClientData(int n, void *clientData)
 443 {
 444     wxCHECK_RET( n >= 0 && n < m_noItems,
 445                  wxT("invalid index in wxListBox::SetClientData") );
 446
 447 #if wxUSE_OWNER_DRAWN
 448     if ( m_windowStyle & wxLB_OWNERDRAW )
 449     {
 450         // client data must be pointer to wxOwnerDrawn, otherwise we would crash
 451         // in OnMeasure/OnDraw.
 452         wxFAIL_MSG(wxT("Can't use client data with owner-drawn listboxes"));
 453     }
 454 #endif // wxUSE_OWNER_DRAWN
 455
 456     if ( ListBox_SetItemData(GetHwnd(), n, clientData) == LB_ERR )
 457         wxLogDebug(wxT("LB_SETITEMDATA failed"));
 458 }
 459
 460 // Return number of selections and an array of selected integers
 461 int wxListBox::GetSelections(wxArrayInt& aSelections) const
 462 {
 463     aSelections.Empty();
 464
 465     if ( HasMultipleSelection() )
 466     {
 467         int countSel = ListBox_GetSelCount(GetHwnd());
 468         if ( countSel == LB_ERR )
 469         {
 470             wxLogDebug(_T("ListBox_GetSelCount failed"));
 471         }
 472         else if ( countSel != 0 )
 473         {
 474             int *selections = new int[countSel];
 475
 476             if ( ListBox_GetSelItems(GetHwnd(),
 477                                      countSel, selections) == LB_ERR )
 478             {
 479                 wxLogDebug(wxT("ListBox_GetSelItems failed"));
 480                 countSel = -1;
 481             }
 482             else
 483             {
 484                 aSelections.Alloc(countSel);
 485                 for ( int n = 0; n < countSel; n++ )
 486                     aSelections.Add(selections[n]);
 487             }
 488
 489             delete [] selections;
 490         }
 491
 492         return countSel;
 493     }
 494     else  // single-selection listbox
 495     {
 496         if (ListBox_GetCurSel(GetHwnd()) > -1)
 497             aSelections.Add(ListBox_GetCurSel(GetHwnd()));
 498
 499         return aSelections.Count();
 500     }
 501 }
 502
 503 // Get single selection, for single choice list items
 504 int wxListBox::GetSelection() const
 505 {
 506     wxCHECK_MSG( !HasMultipleSelection(),
 507                  -1,
 508                  wxT("GetSelection() can't be used with multiple-selection listboxes, use GetSelections() instead.") );
 509
 510     return ListBox_GetCurSel(GetHwnd());
 511 }
 512
 513 // Find string for position
 514 wxString wxListBox::GetString(int N) const
 515 {
 516     wxCHECK_MSG( N >= 0 && N < m_noItems, wxEmptyString,
 517                  wxT("invalid index in wxListBox::GetClientData") );
 518
 519     int len = ListBox_GetTextLen(GetHwnd(), N);
 520
 521     // +1 for terminating NUL
 522     wxString result;
 523     ListBox_GetText(GetHwnd(), N, wxStringBuffer(result, len + 1));
 524
 525     return result;
 526 }
 527
 528 void
 529 wxListBox::DoInsertItems(const wxArrayString& items, int pos)
 530 {
 531     wxCHECK_RET( pos >= 0 && pos <= m_noItems,
 532                  wxT("invalid index in wxListBox::InsertItems") );
 533
 534     int nItems = items.GetCount();
 535     for ( int i = 0; i < nItems; i++ )
 536     {
 537         int idx = ListBox_InsertString(GetHwnd(), i + pos, items[i]);
 538
 539 #if wxUSE_OWNER_DRAWN
 540         if ( m_windowStyle & wxLB_OWNERDRAW )
 541         {
 542             wxOwnerDrawn *pNewItem = CreateLboxItem(idx);
 543             pNewItem->SetName(items[i]);
 544             pNewItem->SetFont(GetFont());
 545             m_aItems.Insert(pNewItem, idx);
 546
 547             ListBox_SetItemData(GetHwnd(), idx, pNewItem);
 548         }
 549 #endif // wxUSE_OWNER_DRAWN
 550     }
 551
 552     m_noItems += nItems;
 553
 554     SetHorizontalExtent();
 555 }
 556
 557 void wxListBox::SetString(int N, const wxString& s)
 558 {
 559     wxCHECK_RET( N >= 0 && N < m_noItems,
 560                  wxT("invalid index in wxListBox::SetString") );
 561
 562     // remember the state of the item
 563     bool wasSelected = IsSelected(N);
 564
 565     void *oldData = NULL;
 566     wxClientData *oldObjData = NULL;
 567     if ( m_clientDataItemsType == wxClientData_Void )
 568         oldData = GetClientData(N);
 569     else if ( m_clientDataItemsType == wxClientData_Object )
 570         oldObjData = GetClientObject(N);
 571
 572     // delete and recreate it
 573     SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);
 574
 575     int newN = N;
 576     if ( N == m_noItems - 1 )
 577         newN = -1;
 578
 579     ListBox_InsertString(GetHwnd(), newN, s);
 580
 581     // restore the client data
 582     if ( oldData )
 583         SetClientData(N, oldData);
 584     else if ( oldObjData )
 585         SetClientObject(N, oldObjData);
 586
 587     // we may have lost the selection
 588     if ( wasSelected )
 589         Select(N);
 590
 591 #if wxUSE_OWNER_DRAWN
 592     if ( m_windowStyle & wxLB_OWNERDRAW )
 593     {
 594         // update item's text
 595         m_aItems[N]->SetName(s);
 596
 597         // reassign the item's data
 598         ListBox_SetItemData(GetHwnd(), N, m_aItems[N]);
 599     }
 600 #endif  //USE_OWNER_DRAWN
 601 }
 602
 603 int wxListBox::GetCount() const
 604 {
 605     return m_noItems;
 606 }
 607
 608 // ----------------------------------------------------------------------------
 609 // helpers
 610 // ----------------------------------------------------------------------------
 611
 612 // Windows-specific code to set the horizontal extent of the listbox, if
 613 // necessary. If s is non-NULL, it's used to calculate the horizontal extent.
 614 // Otherwise, all strings are used.
 615 void wxListBox::SetHorizontalExtent(const wxString& s)
 616 {
 617     // Only necessary if we want a horizontal scrollbar
 618     if (!(m_windowStyle & wxHSCROLL))
 619         return;
 620     TEXTMETRIC lpTextMetric;
 621
 622     if ( !s.IsEmpty() )
 623     {
 624         int existingExtent = (int)SendMessage(GetHwnd(), LB_GETHORIZONTALEXTENT, 0, 0L);
 625         HDC dc = GetWindowDC(GetHwnd());
 626         HFONT oldFont = 0;
 627         if (GetFont().Ok() && GetFont().GetResourceHandle())
 628             oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
 629
 630         GetTextMetrics(dc, &lpTextMetric);
 631         SIZE extentXY;
 632         ::GetTextExtentPoint(dc, (LPTSTR) (const wxChar *)s, s.Length(), &extentXY);
 633         int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 634
 635         if (oldFont)
 636             ::SelectObject(dc, oldFont);
 637
 638         ReleaseDC(GetHwnd(), dc);
 639         if (extentX > existingExtent)
 640             SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(extentX), 0L);
 641     }
 642     else
 643     {
 644         int largestExtent = 0;
 645         HDC dc = GetWindowDC(GetHwnd());
 646         HFONT oldFont = 0;
 647         if (GetFont().Ok() && GetFont().GetResourceHandle())
 648             oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
 649
 650         GetTextMetrics(dc, &lpTextMetric);
 651
 652         // FIXME: buffer overflow!!
 653         wxChar buf[1024];
 654         for (int i = 0; i < m_noItems; i++)
 655         {
 656             int len = (int)SendMessage(GetHwnd(), LB_GETTEXT, i, (LPARAM)buf);
 657             buf[len] = 0;
 658             SIZE extentXY;
 659             ::GetTextExtentPoint(dc, buf, len, &extentXY);
 660             int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 661             if (extentX > largestExtent)
 662                 largestExtent = extentX;
 663         }
 664         if (oldFont)
 665             ::SelectObject(dc, oldFont);
 666
 667         ReleaseDC(GetHwnd(), dc);
 668         SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(largestExtent), 0L);
 669     }
 670 }
 671
 672 wxSize wxListBox::DoGetBestSize() const
 673 {
 674     // find the widest string
 675     int wLine;
 676     int wListbox = 0;
 677     for ( int i = 0; i < m_noItems; i++ )
 678     {
 679         wxString str(GetString(i));
 680         GetTextExtent(str, &wLine, NULL);
 681         if ( wLine > wListbox )
 682             wListbox = wLine;
 683     }
 684
 685     // give it some reasonable default value if there are no strings in the
 686     // list
 687     if ( wListbox == 0 )
 688         wListbox = 100;
 689
 690     // the listbox should be slightly larger than the widest string
 691     int cx, cy;
 692     wxGetCharSize(GetHWND(), &cx, &cy, &GetFont());
 693
 694     wListbox += 3*cx;
 695
 696     // don't make the listbox too tall (limit height to 10 items) but don't
 697     // make it too small neither
 698     int hListbox = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy)*
 699                     wxMin(wxMax(m_noItems, 3), 10);
 700
 701     return wxSize(wListbox, hListbox);
 702 }
 703
 704 // ----------------------------------------------------------------------------
 705 // callbacks
 706 // ----------------------------------------------------------------------------
 707
 708 bool wxListBox::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 709 {
 710     wxEventType evtType;
 711     if ( param == LBN_SELCHANGE )
 712     {
 713         evtType = wxEVT_COMMAND_LISTBOX_SELECTED;
 714     }
 715     else if ( param == LBN_DBLCLK )
 716     {
 717         evtType = wxEVT_COMMAND_LISTBOX_DOUBLECLICKED;
 718     }
 719     else
 720     {
 721         // some event we're not interested in
 722         return FALSE;
 723     }
 724
 725     wxCommandEvent event(evtType, m_windowId);
 726     event.SetEventObject( this );
 727
 728     // retrieve the affected item
 729     int n = SendMessage(GetHwnd(), LB_GETCARETINDEX, 0, 0);
 730     if ( n != LB_ERR )
 731     {
 732         if ( HasClientObjectData() )
 733             event.SetClientObject( GetClientObject(n) );
 734         else if ( HasClientUntypedData() )
 735             event.SetClientData( GetClientData(n) );
 736
 737         event.SetString( GetString(n) );
 738         event.SetExtraLong( HasMultipleSelection() ? IsSelected(n) : TRUE );
 739     }
 740
 741     event.m_commandInt = n;
 742
 743     return GetEventHandler()->ProcessEvent(event);
 744 }
 745
 746 // ----------------------------------------------------------------------------
 747 // wxCheckListBox support
 748 // ----------------------------------------------------------------------------
 749
 750 #if wxUSE_OWNER_DRAWN
 751
 752 // drawing
 753 // -------
 754
 755 // space beneath/above each row in pixels
 756 // "standard" checklistbox use 1 here, some might prefer 2. 0 is ugly.
 757 #define OWNER_DRAWN_LISTBOX_EXTRA_SPACE    (1)
 758
 759 // the height is the same for all items
 760 // TODO should be changed for LBS_OWNERDRAWVARIABLE style listboxes
 761
 762 // NB: can't forward this to wxListBoxItem because LB_SETITEMDATA
 763 //     message is not yet sent when we get here!
 764 bool wxListBox::MSWOnMeasure(WXMEASUREITEMSTRUCT *item)
 765 {
 766     // only owner-drawn control should receive this message
 767     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), FALSE );
 768
 769     MEASUREITEMSTRUCT *pStruct = (MEASUREITEMSTRUCT *)item;
 770
 771 #ifdef __WXWINCE__
 772     HDC hdc = GetDC(NULL);
 773 #else
 774     HDC hdc = CreateIC(wxT("DISPLAY"), NULL, NULL, 0);
 775 #endif
 776
 777     wxDC dc;
 778     dc.SetHDC((WXHDC)hdc);
 779     dc.SetFont(wxSystemSettings::GetFont(wxSYS_ANSI_VAR_FONT));
 780
 781     pStruct->itemHeight = dc.GetCharHeight() + 2*OWNER_DRAWN_LISTBOX_EXTRA_SPACE;
 782     pStruct->itemWidth  = dc.GetCharWidth();
 783
 784     dc.SetHDC(0);
 785
 786     DeleteDC(hdc);
 787
 788     return TRUE;
 789 }
 790
 791 // forward the message to the appropriate item
 792 bool wxListBox::MSWOnDraw(WXDRAWITEMSTRUCT *item)
 793 {
 794     // only owner-drawn control should receive this message
 795     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), FALSE );
 796
 797     DRAWITEMSTRUCT *pStruct = (DRAWITEMSTRUCT *)item;
 798     UINT itemID = pStruct->itemID;
 799
 800     // the item may be -1 for an empty listbox
 801     if ( itemID == (UINT)-1 )
 802         return FALSE;
 803
 804     long data = ListBox_GetItemData(GetHwnd(), pStruct->itemID);
 805
 806     wxCHECK( data && (data != LB_ERR), FALSE );
 807
 808     wxListBoxItem *pItem = (wxListBoxItem *)data;
 809
 810     wxDCTemp dc((WXHDC)pStruct->hDC);
 811     wxRect rect(wxPoint(pStruct->rcItem.left, pStruct->rcItem.top),
 812                 wxPoint(pStruct->rcItem.right, pStruct->rcItem.bottom));
 813
 814     return pItem->OnDrawItem(dc, rect,
 815                              (wxOwnerDrawn::wxODAction)pStruct->itemAction,
 816                              (wxOwnerDrawn::wxODStatus)pStruct->itemState);
 817 }
 818
 819 #endif // wxUSE_OWNER_DRAWN
 820
 821 #endif // wxUSE_LISTBOX