src/msw/combobox.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        msw/combobox.cpp
   3 // Purpose:     wxComboBox class
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     01/02/97
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  21 #pragma implementation "combobox.h"
  22 #endif
  23
  24 // For compilers that support precompilation, includes "wx.h".
  25 #include "wx/wxprec.h"
  26
  27 #ifdef __BORLANDC__
  28     #pragma hdrstop
  29 #endif
  30
  31 #if wxUSE_COMBOBOX
  32
  33 #ifndef WX_PRECOMP
  34     #include "wx/settings.h"
  35     #include "wx/log.h"
  36     // for wxEVT_COMMAND_TEXT_ENTER
  37     #include "wx/textctrl.h"
  38 #endif
  39
  40 #include "wx/app.h"
  41 #include "wx/combobox.h"
  42 #include "wx/brush.h"
  43 #include "wx/clipbrd.h"
  44 #include "wx/msw/private.h"
  45
  46 #if wxUSE_TOOLTIPS
  47     #if !defined(__GNUWIN32_OLD__) || defined(__CYGWIN10__)
  48         #include <commctrl.h>
  49     #endif
  50     #include "wx/tooltip.h"
  51 #endif // wxUSE_TOOLTIPS
  52
  53 // ----------------------------------------------------------------------------
  54 // wxWin macros
  55 // ----------------------------------------------------------------------------
  56
  57 #if wxUSE_EXTENDED_RTTI
  58 WX_DEFINE_FLAGS( wxComboBoxStyle )
  59
  60 wxBEGIN_FLAGS( wxComboBoxStyle )
  61     // new style border flags, we put them first to
  62     // use them for streaming out
  63     wxFLAGS_MEMBER(wxBORDER_SIMPLE)
  64     wxFLAGS_MEMBER(wxBORDER_SUNKEN)
  65     wxFLAGS_MEMBER(wxBORDER_DOUBLE)
  66     wxFLAGS_MEMBER(wxBORDER_RAISED)
  67     wxFLAGS_MEMBER(wxBORDER_STATIC)
  68     wxFLAGS_MEMBER(wxBORDER_NONE)
  69
  70     // old style border flags
  71     wxFLAGS_MEMBER(wxSIMPLE_BORDER)
  72     wxFLAGS_MEMBER(wxSUNKEN_BORDER)
  73     wxFLAGS_MEMBER(wxDOUBLE_BORDER)
  74     wxFLAGS_MEMBER(wxRAISED_BORDER)
  75     wxFLAGS_MEMBER(wxSTATIC_BORDER)
  76     wxFLAGS_MEMBER(wxBORDER)
  77
  78     // standard window styles
  79     wxFLAGS_MEMBER(wxTAB_TRAVERSAL)
  80     wxFLAGS_MEMBER(wxCLIP_CHILDREN)
  81     wxFLAGS_MEMBER(wxTRANSPARENT_WINDOW)
  82     wxFLAGS_MEMBER(wxWANTS_CHARS)
  83     wxFLAGS_MEMBER(wxFULL_REPAINT_ON_RESIZE)
  84     wxFLAGS_MEMBER(wxALWAYS_SHOW_SB )
  85     wxFLAGS_MEMBER(wxVSCROLL)
  86     wxFLAGS_MEMBER(wxHSCROLL)
  87
  88     wxFLAGS_MEMBER(wxCB_SIMPLE)
  89     wxFLAGS_MEMBER(wxCB_SORT)
  90     wxFLAGS_MEMBER(wxCB_READONLY)
  91     wxFLAGS_MEMBER(wxCB_DROPDOWN)
  92
  93 wxEND_FLAGS( wxComboBoxStyle )
  94
  95 IMPLEMENT_DYNAMIC_CLASS_XTI(wxComboBox, wxControl,"wx/combobox.h")
  96
  97 wxBEGIN_PROPERTIES_TABLE(wxComboBox)
  98     wxEVENT_PROPERTY( Select , wxEVT_COMMAND_COMBOBOX_SELECTED , wxCommandEvent )
  99     wxEVENT_PROPERTY( TextEnter , wxEVT_COMMAND_TEXT_ENTER , wxCommandEvent )
 100
 101     // TODO DELEGATES
 102     wxPROPERTY( Font , wxFont , SetFont , GetFont  , EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
 103     wxPROPERTY_COLLECTION( Choices , wxArrayString , wxString , AppendString , GetStrings , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
 104     wxPROPERTY( Value ,wxString, SetValue, GetValue, EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
 105     wxPROPERTY( Selection ,int, SetSelection, GetSelection, EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
 106     wxPROPERTY_FLAGS( WindowStyle , wxComboBoxStyle , long , SetWindowStyleFlag , GetWindowStyleFlag , EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group")) // style
 107 wxEND_PROPERTIES_TABLE()
 108
 109 wxBEGIN_HANDLERS_TABLE(wxComboBox)
 110 wxEND_HANDLERS_TABLE()
 111
 112 wxCONSTRUCTOR_5( wxComboBox , wxWindow* , Parent , wxWindowID , Id , wxString , Value , wxPoint , Position , wxSize , Size )
 113 #else
 114 IMPLEMENT_DYNAMIC_CLASS(wxComboBox, wxControl)
 115
 116 BEGIN_EVENT_TABLE(wxComboBox, wxControl)
 117     EVT_MENU(wxID_CUT, wxComboBox::OnCut)
 118     EVT_MENU(wxID_COPY, wxComboBox::OnCopy)
 119     EVT_MENU(wxID_PASTE, wxComboBox::OnPaste)
 120     EVT_MENU(wxID_UNDO, wxComboBox::OnUndo)
 121     EVT_MENU(wxID_REDO, wxComboBox::OnRedo)
 122     EVT_MENU(wxID_CLEAR, wxComboBox::OnDelete)
 123     EVT_MENU(wxID_SELECTALL, wxComboBox::OnSelectAll)
 124
 125     EVT_UPDATE_UI(wxID_CUT, wxComboBox::OnUpdateCut)
 126     EVT_UPDATE_UI(wxID_COPY, wxComboBox::OnUpdateCopy)
 127     EVT_UPDATE_UI(wxID_PASTE, wxComboBox::OnUpdatePaste)
 128     EVT_UPDATE_UI(wxID_UNDO, wxComboBox::OnUpdateUndo)
 129     EVT_UPDATE_UI(wxID_REDO, wxComboBox::OnUpdateRedo)
 130     EVT_UPDATE_UI(wxID_CLEAR, wxComboBox::OnUpdateDelete)
 131     EVT_UPDATE_UI(wxID_SELECTALL, wxComboBox::OnUpdateSelectAll)
 132 END_EVENT_TABLE()
 133
 134 #endif
 135
 136 // ----------------------------------------------------------------------------
 137 // function prototypes
 138 // ----------------------------------------------------------------------------
 139
 140 LRESULT APIENTRY _EXPORT wxComboEditWndProc(HWND hWnd,
 141                                             UINT message,
 142                                             WPARAM wParam,
 143                                             LPARAM lParam);
 144
 145 // ---------------------------------------------------------------------------
 146 // global vars
 147 // ---------------------------------------------------------------------------
 148
 149 // the pointer to standard radio button wnd proc
 150 static WNDPROC gs_wndprocEdit = (WNDPROC)NULL;
 151
 152 // ============================================================================
 153 // implementation
 154 // ============================================================================
 155
 156 // ----------------------------------------------------------------------------
 157 // wnd proc for subclassed edit control
 158 // ----------------------------------------------------------------------------
 159
 160 LRESULT APIENTRY _EXPORT wxComboEditWndProc(HWND hWnd,
 161                                             UINT message,
 162                                             WPARAM wParam,
 163                                             LPARAM lParam)
 164 {
 165     HWND hwndCombo = ::GetParent(hWnd);
 166     wxWindow *win = wxFindWinFromHandle((WXHWND)hwndCombo);
 167
 168     switch ( message )
 169     {
 170         // forward some messages to the combobox to generate the appropriate
 171         // wxEvents from them
 172         case WM_KEYUP:
 173         case WM_KEYDOWN:
 174         case WM_CHAR:
 175         case WM_SETFOCUS:
 176         case WM_KILLFOCUS:
 177             {
 178                 wxComboBox *combo = wxDynamicCast(win, wxComboBox);
 179                 if ( !combo )
 180                 {
 181                     // we can get WM_KILLFOCUS while our parent is already half
 182                     // destroyed and hence doesn't look like a combobx any
 183                     // longer, check for it to avoid bogus assert failures
 184                     if ( !win->IsBeingDeleted() )
 185                     {
 186                         wxFAIL_MSG( _T("should have combo as parent") );
 187                     }
 188                 }
 189                 else if ( combo->MSWProcessEditMsg(message, wParam, lParam) )
 190                 {
 191                     // handled by parent
 192                     return 0;
 193                 }
 194             }
 195             break;
 196
 197         case WM_GETDLGCODE:
 198             {
 199                 wxCHECK_MSG( win, 0, _T("should have a parent") );
 200
 201                 if ( win->GetWindowStyle() & wxPROCESS_ENTER )
 202                 {
 203                     // need to return a custom dlg code or we'll never get it
 204                     return DLGC_WANTMESSAGE;
 205                 }
 206             }
 207             break;
 208
 209         // deal with tooltips here
 210 #if wxUSE_TOOLTIPS && defined(TTN_NEEDTEXT)
 211         case WM_NOTIFY:
 212             {
 213                 wxCHECK_MSG( win, 0, _T("should have a parent") );
 214
 215                 NMHDR* hdr = (NMHDR *)lParam;
 216                 if ( hdr->code == TTN_NEEDTEXT )
 217                 {
 218                     wxToolTip *tooltip = win->GetToolTip();
 219                     if ( tooltip )
 220                     {
 221                         TOOLTIPTEXT *ttt = (TOOLTIPTEXT *)lParam;
 222                         ttt->lpszText = (wxChar *)tooltip->GetTip().c_str();
 223                     }
 224
 225                     // processed
 226                     return 0;
 227                 }
 228             }
 229             break;
 230 #endif // wxUSE_TOOLTIPS
 231     }
 232
 233     return ::CallWindowProc(CASTWNDPROC gs_wndprocEdit, hWnd, message, wParam, lParam);
 234 }
 235
 236 // ----------------------------------------------------------------------------
 237 // wxComboBox callbacks
 238 // ----------------------------------------------------------------------------
 239
 240 WXLRESULT wxComboBox::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam)
 241 {
 242     // handle WM_CTLCOLOR messages from our EDIT control to be able to set its
 243     // colour correctly (to be the same as our own one)
 244     switch ( nMsg )
 245     {
 246         case CB_SETCURSEL:
 247             // Selection was set with SetSelection.  Update the value too.
 248             if ((int)wParam > GetCount())
 249                 m_value = wxEmptyString;
 250             else
 251                 m_value = GetString(wParam);
 252             break;
 253     }
 254
 255     return wxChoice::MSWWindowProc(nMsg, wParam, lParam);
 256 }
 257
 258 bool wxComboBox::MSWProcessEditMsg(WXUINT msg, WXWPARAM wParam, WXLPARAM lParam)
 259 {
 260     switch ( msg )
 261     {
 262         case WM_CHAR:
 263             // for compatibility with wxTextCtrl, generate a special message
 264             // when Enter is pressed
 265             if ( wParam == VK_RETURN )
 266             {
 267                 wxCommandEvent event(wxEVT_COMMAND_TEXT_ENTER, m_windowId);
 268                 InitCommandEvent(event);
 269                 event.SetString(GetValue());
 270                 event.SetInt(GetSelection());
 271                 ProcessCommand(event);
 272             }
 273
 274             return HandleChar(wParam, lParam, true /* isASCII */);
 275
 276         case WM_KEYDOWN:
 277             return HandleKeyDown(wParam, lParam);
 278
 279         case WM_KEYUP:
 280             return HandleKeyUp(wParam, lParam);
 281
 282         case WM_SETFOCUS:
 283             return HandleSetFocus((WXHWND)wParam);
 284
 285         case WM_KILLFOCUS:
 286             return HandleKillFocus((WXHWND)wParam);
 287     }
 288
 289     return false;
 290 }
 291
 292 bool wxComboBox::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 293 {
 294     wxString value;
 295     int sel = -1;
 296     switch ( param )
 297     {
 298         case CBN_SELCHANGE:
 299             sel = GetSelection();
 300
 301             // somehow we get 2 CBN_SELCHANGE events with the same index when
 302             // the user selects an item in the combobox -- ignore duplicates
 303             if ( sel > -1 && sel != m_selectionOld )
 304             {
 305                 m_selectionOld = sel;
 306
 307                 // GetValue() would still return the old value from here but
 308                 // according to the docs we should return the new value if the
 309                 // user calls it in his event handler, so update internal
 310                 // m_value
 311                 m_value = GetString(sel);
 312
 313                 wxCommandEvent event(wxEVT_COMMAND_COMBOBOX_SELECTED, GetId());
 314                 event.SetInt(sel);
 315                 event.SetEventObject(this);
 316                 event.SetString(m_value);
 317                 ProcessCommand(event);
 318             }
 319             else // no valid selection
 320             {
 321                 m_selectionOld = sel;
 322
 323                 // hence no EVT_TEXT neither
 324                 break;
 325             }
 326
 327             // fall through: for compability with wxGTK, also send the text
 328             // update event when the selection changes (this also seems more
 329             // logical as the text does change)
 330
 331         case CBN_EDITCHANGE:
 332             {
 333                 wxCommandEvent event(wxEVT_COMMAND_TEXT_UPDATED, GetId());
 334
 335                 // if sel != -1, value was initialized above (and we can't use
 336                 // GetValue() here as it would return the old selection and we
 337                 // want the new one)
 338                 if ( sel == -1 )
 339                 {
 340                     m_value = wxGetWindowText(GetHwnd());
 341                 }
 342                 else // we're synthesizing text updated event from sel change
 343                 {
 344                     // We need to retrieve the current selection because the
 345                     // user may have changed it in the previous handler (for
 346                     // CBN_SELCHANGE above).
 347                     sel = GetSelection();
 348                     if ( sel > -1 )
 349                     {
 350                         m_value = GetString(sel);
 351                     }
 352                 }
 353
 354                 event.SetString(m_value);
 355                 event.SetEventObject(this);
 356                 ProcessCommand(event);
 357             }
 358             break;
 359     }
 360
 361     // there is no return value for the CBN_ notifications, so always return
 362     // false from here to pass the message to DefWindowProc()
 363     return false;
 364 }
 365
 366 WXHWND wxComboBox::GetEditHWND() const
 367 {
 368     // this function should not be called for wxCB_READONLY controls, it is
 369     // the callers responsability to check this
 370     wxASSERT_MSG( !(GetWindowStyle() & wxCB_READONLY),
 371                   _T("read-only combobox doesn't have any edit control") );
 372
 373     POINT pt;
 374     pt.x = pt.y = 4;
 375     HWND hwndEdit = ::ChildWindowFromPoint(GetHwnd(), pt);
 376     if ( !hwndEdit || hwndEdit == GetHwnd() )
 377     {
 378         wxFAIL_MSG(_T("not read only combobox without edit control?"));
 379     }
 380
 381     return (WXHWND)hwndEdit;
 382 }
 383
 384 // ----------------------------------------------------------------------------
 385 // wxComboBox creation
 386 // ----------------------------------------------------------------------------
 387
 388 bool wxComboBox::Create(wxWindow *parent, wxWindowID id,
 389                         const wxString& value,
 390                         const wxPoint& pos,
 391                         const wxSize& size,
 392                         int n, const wxString choices[],
 393                         long style,
 394                         const wxValidator& validator,
 395                         const wxString& name)
 396 {
 397     // pretend that wxComboBox is hidden while it is positioned and resized and
 398     // show it only right before leaving this method because otherwise there is
 399     // some noticeable flicker while the control rearranges itself
 400     m_isShown = false;
 401
 402     if ( !CreateAndInit(parent, id, pos, size, n, choices, style,
 403                         validator, name) )
 404         return false;
 405
 406     // we shouldn't call SetValue() for an empty string because this would
 407     // (correctly) result in an assert with a read only combobox and is useless
 408     // for the other ones anyhow
 409     if ( !value.empty() )
 410         SetValue(value);
 411
 412     // a (not read only) combobox is, in fact, 2 controls: the combobox itself
 413     // and an edit control inside it and if we want to catch events from this
 414     // edit control, we must subclass it as well
 415     if ( !(style & wxCB_READONLY) )
 416     {
 417         gs_wndprocEdit = wxSetWindowProc((HWND)GetEditHWND(),
 418                                          wxComboEditWndProc);
 419     }
 420
 421     // and finally, show the control
 422     Show(true);
 423
 424     return true;
 425 }
 426
 427 bool wxComboBox::Create(wxWindow *parent, wxWindowID id,
 428                         const wxString& value,
 429                         const wxPoint& pos,
 430                         const wxSize& size,
 431                         const wxArrayString& choices,
 432                         long style,
 433                         const wxValidator& validator,
 434                         const wxString& name)
 435 {
 436     wxCArrayString chs(choices);
 437     return Create(parent, id, value, pos, size, chs.GetCount(),
 438                   chs.GetStrings(), style, validator, name);
 439 }
 440
 441 WXDWORD wxComboBox::MSWGetStyle(long style, WXDWORD *exstyle) const
 442 {
 443     // we never have an external border
 444     WXDWORD msStyle = wxChoice::MSWGetStyle
 445                       (
 446                         (style & ~wxBORDER_MASK) | wxBORDER_NONE, exstyle
 447                       );
 448
 449     // remove the style always added by wxChoice
 450     msStyle &= ~CBS_DROPDOWNLIST;
 451
 452     if ( style & wxCB_READONLY )
 453         msStyle |= CBS_DROPDOWNLIST;
 454 #ifndef __WXWINCE__
 455     else if ( style & wxCB_SIMPLE )
 456         msStyle |= CBS_SIMPLE; // A list (shown always) and edit control
 457 #endif
 458     else
 459         msStyle |= CBS_DROPDOWN;
 460
 461     // there is no reason to not always use CBS_AUTOHSCROLL, so do use it
 462     msStyle |= CBS_AUTOHSCROLL;
 463
 464     // NB: we used to also add CBS_NOINTEGRALHEIGHT here but why?
 465
 466     return msStyle;
 467 }
 468
 469 // ----------------------------------------------------------------------------
 470 // wxComboBox text control-like methods
 471 // ----------------------------------------------------------------------------
 472
 473 void wxComboBox::SetValue(const wxString& value)
 474 {
 475     if ( HasFlag(wxCB_READONLY) )
 476         SetStringSelection(value);
 477     else
 478         SetWindowText(GetHwnd(), value.c_str());
 479
 480     m_value = value;
 481     m_selectionOld = GetSelection();
 482 }
 483
 484 // Clipboard operations
 485 void wxComboBox::Copy()
 486 {
 487     SendMessage(GetHwnd(), WM_COPY, 0, 0L);
 488 }
 489
 490 void wxComboBox::Cut()
 491 {
 492     SendMessage(GetHwnd(), WM_CUT, 0, 0L);
 493 }
 494
 495 void wxComboBox::Paste()
 496 {
 497     SendMessage(GetHwnd(), WM_PASTE, 0, 0L);
 498 }
 499
 500 void wxComboBox::Undo()
 501 {
 502     if (CanUndo())
 503     {
 504         HWND hEditWnd = (HWND) GetEditHWND() ;
 505         if ( hEditWnd )
 506             ::SendMessage(hEditWnd, EM_UNDO, 0, 0);
 507     }
 508 }
 509
 510 void wxComboBox::Redo()
 511 {
 512     if (CanUndo())
 513     {
 514         // Same as Undo, since Undo undoes the undo, i.e. a redo.
 515         HWND hEditWnd = (HWND) GetEditHWND() ;
 516         if ( hEditWnd )
 517             ::SendMessage(hEditWnd, EM_UNDO, 0, 0);
 518     }
 519 }
 520
 521 void wxComboBox::SelectAll()
 522 {
 523     SetSelection(0, GetLastPosition());
 524 }
 525
 526 bool wxComboBox::CanUndo() const
 527 {
 528     HWND hEditWnd = (HWND) GetEditHWND() ;
 529     if ( hEditWnd )
 530         return ::SendMessage(hEditWnd, EM_CANUNDO, 0, 0) != 0;
 531     else
 532         return false;
 533 }
 534
 535 bool wxComboBox::CanRedo() const
 536 {
 537     HWND hEditWnd = (HWND) GetEditHWND() ;
 538     if ( hEditWnd )
 539         return ::SendMessage(hEditWnd, EM_CANUNDO, 0, 0) != 0;
 540     else
 541         return false;
 542 }
 543
 544 bool wxComboBox::HasSelection() const
 545 {
 546     long from, to;
 547     GetSelection(&from, &to);
 548     return from != to;
 549 }
 550
 551 bool wxComboBox::CanCopy() const
 552 {
 553     // Can copy if there's a selection
 554     return HasSelection();
 555 }
 556
 557 bool wxComboBox::CanCut() const
 558 {
 559     return CanCopy() && IsEditable();
 560 }
 561
 562 bool wxComboBox::CanPaste() const
 563 {
 564     if ( !IsEditable() )
 565         return false;
 566
 567     // Standard edit control: check for straight text on clipboard
 568     if ( !::OpenClipboard(GetHwndOf(wxTheApp->GetTopWindow())) )
 569         return false;
 570
 571     bool isTextAvailable = ::IsClipboardFormatAvailable(CF_TEXT) != 0;
 572     ::CloseClipboard();
 573
 574     return isTextAvailable;
 575 }
 576
 577 bool wxComboBox::IsEditable() const
 578 {
 579     return !HasFlag(wxCB_READONLY);
 580 }
 581
 582 void wxComboBox::SetEditable(bool WXUNUSED(editable))
 583 {
 584   // Can't implement in MSW?
 585 //  HWND hWnd = GetHwnd();
 586 //  SendMessage(hWnd, EM_SETREADONLY, (WPARAM)!editable, (LPARAM)0L);
 587 }
 588
 589 void wxComboBox::SetInsertionPoint(long pos)
 590 {
 591     if ( GetWindowStyle() & wxCB_READONLY )
 592         return;
 593
 594 #ifdef __WIN32__
 595     HWND hWnd = GetHwnd();
 596     ::SendMessage(hWnd, CB_SETEDITSEL, 0, MAKELPARAM(pos, pos));
 597     HWND hEditWnd = (HWND) GetEditHWND() ;
 598     if ( hEditWnd )
 599     {
 600         // Scroll insertion point into view
 601         SendMessage(hEditWnd, EM_SCROLLCARET, (WPARAM)0, (LPARAM)0);
 602         // Why is this necessary? (Copied from wxTextCtrl::SetInsertionPoint)
 603         SendMessage(hEditWnd, EM_REPLACESEL, 0, (LPARAM) wxEmptyString);
 604     }
 605 #endif // __WIN32__
 606 }
 607
 608 void wxComboBox::SetInsertionPointEnd()
 609 {
 610     // setting insertion point doesn't make sense for read only comboboxes
 611     if ( !(GetWindowStyle() & wxCB_READONLY) )
 612     {
 613         long pos = GetLastPosition();
 614         SetInsertionPoint(pos);
 615     }
 616 }
 617
 618 long wxComboBox::GetInsertionPoint() const
 619 {
 620 #ifdef __WIN32__
 621     DWORD Pos=(DWORD)SendMessage(GetHwnd(), CB_GETEDITSEL, 0, 0L);
 622     return Pos&0xFFFF;
 623 #else
 624     return 0;
 625 #endif
 626 }
 627
 628 long wxComboBox::GetLastPosition() const
 629 {
 630     HWND hEditWnd = (HWND) GetEditHWND();
 631
 632     // Get number of characters in the last (only) line. We'll add this to the character
 633     // index for the last line, 1st position.
 634     int lineLength = (int)SendMessage(hEditWnd, EM_LINELENGTH, (WPARAM) 0, (LPARAM)0L);
 635
 636     return (long)(lineLength);
 637 }
 638
 639 void wxComboBox::Replace(long from, long to, const wxString& value)
 640 {
 641 #if wxUSE_CLIPBOARD
 642     Remove(from, to);
 643
 644     // Now replace with 'value', by pasting.
 645     wxSetClipboardData(wxDF_TEXT, (wxObject *)(const wxChar *)value, 0, 0);
 646
 647     // Paste into edit control
 648     SendMessage(GetHwnd(), WM_PASTE, (WPARAM)0, (LPARAM)0L);
 649 #endif
 650 }
 651
 652 void wxComboBox::Remove(long from, long to)
 653 {
 654     // Set selection and remove it
 655     SetSelection(from, to);
 656     SendMessage(GetHwnd(), WM_CUT, (WPARAM)0, (LPARAM)0);
 657 }
 658
 659 void wxComboBox::SetSelection(long from, long to)
 660 {
 661     HWND hWnd = GetHwnd();
 662     long fromChar = from;
 663     long toChar = to;
 664     // if from and to are both -1, it means
 665     // (in wxWidgets) that all text should be selected.
 666     // This translates into Windows convention
 667     if ((from == -1) && (to == -1))
 668     {
 669       fromChar = 0;
 670       toChar = -1;
 671     }
 672
 673     if ( SendMessage(hWnd, CB_SETEDITSEL, (WPARAM)0, (LPARAM)MAKELONG(fromChar, toChar)) == CB_ERR )
 674     {
 675         wxLogDebug(_T("CB_SETEDITSEL failed"));
 676     }
 677 }
 678
 679 void wxComboBox::GetSelection(long* from, long* to) const
 680 {
 681     DWORD dwStart, dwEnd;
 682     ::SendMessage(GetHwnd(), CB_GETEDITSEL, (WPARAM)&dwStart, (LPARAM)&dwEnd);
 683
 684     *from = dwStart;
 685     *to = dwEnd;
 686 }
 687
 688 int wxComboBox::GetSelection() const
 689 {
 690     return wxChoice::GetSelection();
 691 }
 692
 693 // ----------------------------------------------------------------------------
 694 // standard event handling
 695 // ----------------------------------------------------------------------------
 696
 697 void wxComboBox::OnCut(wxCommandEvent& WXUNUSED(event))
 698 {
 699     Cut();
 700 }
 701
 702 void wxComboBox::OnCopy(wxCommandEvent& WXUNUSED(event))
 703 {
 704     Copy();
 705 }
 706
 707 void wxComboBox::OnPaste(wxCommandEvent& WXUNUSED(event))
 708 {
 709     Paste();
 710 }
 711
 712 void wxComboBox::OnUndo(wxCommandEvent& WXUNUSED(event))
 713 {
 714     Undo();
 715 }
 716
 717 void wxComboBox::OnRedo(wxCommandEvent& WXUNUSED(event))
 718 {
 719     Redo();
 720 }
 721
 722 void wxComboBox::OnDelete(wxCommandEvent& WXUNUSED(event))
 723 {
 724     long from, to;
 725     GetSelection(& from, & to);
 726     if (from != -1 && to != -1)
 727         Remove(from, to);
 728 }
 729
 730 void wxComboBox::OnSelectAll(wxCommandEvent& WXUNUSED(event))
 731 {
 732     SetSelection(-1, -1);
 733 }
 734
 735 void wxComboBox::OnUpdateCut(wxUpdateUIEvent& event)
 736 {
 737     event.Enable( CanCut() );
 738 }
 739
 740 void wxComboBox::OnUpdateCopy(wxUpdateUIEvent& event)
 741 {
 742     event.Enable( CanCopy() );
 743 }
 744
 745 void wxComboBox::OnUpdatePaste(wxUpdateUIEvent& event)
 746 {
 747     event.Enable( CanPaste() );
 748 }
 749
 750 void wxComboBox::OnUpdateUndo(wxUpdateUIEvent& event)
 751 {
 752     event.Enable( CanUndo() );
 753 }
 754
 755 void wxComboBox::OnUpdateRedo(wxUpdateUIEvent& event)
 756 {
 757     event.Enable( CanRedo() );
 758 }
 759
 760 void wxComboBox::OnUpdateDelete(wxUpdateUIEvent& event)
 761 {
 762     event.Enable(HasSelection() && IsEditable()) ;
 763 }
 764
 765 void wxComboBox::OnUpdateSelectAll(wxUpdateUIEvent& event)
 766 {
 767     event.Enable(GetLastPosition() > 0);
 768 }
 769
 770 #endif // wxUSE_COMBOBOX
 771