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
 114 #else
 115
 116 IMPLEMENT_DYNAMIC_CLASS(wxComboBox, wxControl)
 117
 118 #endif
 119
 120 BEGIN_EVENT_TABLE(wxComboBox, wxControl)
 121     EVT_MENU(wxID_CUT, wxComboBox::OnCut)
 122     EVT_MENU(wxID_COPY, wxComboBox::OnCopy)
 123     EVT_MENU(wxID_PASTE, wxComboBox::OnPaste)
 124     EVT_MENU(wxID_UNDO, wxComboBox::OnUndo)
 125     EVT_MENU(wxID_REDO, wxComboBox::OnRedo)
 126     EVT_MENU(wxID_CLEAR, wxComboBox::OnDelete)
 127     EVT_MENU(wxID_SELECTALL, wxComboBox::OnSelectAll)
 128
 129     EVT_UPDATE_UI(wxID_CUT, wxComboBox::OnUpdateCut)
 130     EVT_UPDATE_UI(wxID_COPY, wxComboBox::OnUpdateCopy)
 131     EVT_UPDATE_UI(wxID_PASTE, wxComboBox::OnUpdatePaste)
 132     EVT_UPDATE_UI(wxID_UNDO, wxComboBox::OnUpdateUndo)
 133     EVT_UPDATE_UI(wxID_REDO, wxComboBox::OnUpdateRedo)
 134     EVT_UPDATE_UI(wxID_CLEAR, wxComboBox::OnUpdateDelete)
 135     EVT_UPDATE_UI(wxID_SELECTALL, wxComboBox::OnUpdateSelectAll)
 136 END_EVENT_TABLE()
 137
 138 // ----------------------------------------------------------------------------
 139 // function prototypes
 140 // ----------------------------------------------------------------------------
 141
 142 LRESULT APIENTRY _EXPORT wxComboEditWndProc(HWND hWnd,
 143                                             UINT message,
 144                                             WPARAM wParam,
 145                                             LPARAM lParam);
 146
 147 // ---------------------------------------------------------------------------
 148 // global vars
 149 // ---------------------------------------------------------------------------
 150
 151 // the pointer to standard radio button wnd proc
 152 static WNDPROC gs_wndprocEdit = (WNDPROC)NULL;
 153
 154 // ============================================================================
 155 // implementation
 156 // ============================================================================
 157
 158 // ----------------------------------------------------------------------------
 159 // wnd proc for subclassed edit control
 160 // ----------------------------------------------------------------------------
 161
 162 LRESULT APIENTRY _EXPORT wxComboEditWndProc(HWND hWnd,
 163                                             UINT message,
 164                                             WPARAM wParam,
 165                                             LPARAM lParam)
 166 {
 167     HWND hwndCombo = ::GetParent(hWnd);
 168     wxWindow *win = wxFindWinFromHandle((WXHWND)hwndCombo);
 169
 170     switch ( message )
 171     {
 172         // forward some messages to the combobox to generate the appropriate
 173         // wxEvents from them
 174         case WM_KEYUP:
 175         case WM_KEYDOWN:
 176         case WM_CHAR:
 177         case WM_SETFOCUS:
 178         case WM_KILLFOCUS:
 179             {
 180                 wxComboBox *combo = wxDynamicCast(win, wxComboBox);
 181                 if ( !combo )
 182                 {
 183                     // we can get WM_KILLFOCUS while our parent is already half
 184                     // destroyed and hence doesn't look like a combobx any
 185                     // longer, check for it to avoid bogus assert failures
 186                     if ( !win->IsBeingDeleted() )
 187                     {
 188                         wxFAIL_MSG( _T("should have combo as parent") );
 189                     }
 190                 }
 191                 else if ( combo->MSWProcessEditMsg(message, wParam, lParam) )
 192                 {
 193                     // handled by parent
 194                     return 0;
 195                 }
 196             }
 197             break;
 198
 199         case WM_GETDLGCODE:
 200             {
 201                 wxCHECK_MSG( win, 0, _T("should have a parent") );
 202
 203                 if ( win->GetWindowStyle() & wxPROCESS_ENTER )
 204                 {
 205                     // need to return a custom dlg code or we'll never get it
 206                     return DLGC_WANTMESSAGE;
 207                 }
 208             }
 209             break;
 210
 211         // deal with tooltips here
 212 #if wxUSE_TOOLTIPS && defined(TTN_NEEDTEXT)
 213         case WM_NOTIFY:
 214             {
 215                 wxCHECK_MSG( win, 0, _T("should have a parent") );
 216
 217                 NMHDR* hdr = (NMHDR *)lParam;
 218                 if ( hdr->code == TTN_NEEDTEXT )
 219                 {
 220                     wxToolTip *tooltip = win->GetToolTip();
 221                     if ( tooltip )
 222                     {
 223                         TOOLTIPTEXT *ttt = (TOOLTIPTEXT *)lParam;
 224                         ttt->lpszText = (wxChar *)tooltip->GetTip().c_str();
 225                     }
 226
 227                     // processed
 228                     return 0;
 229                 }
 230             }
 231             break;
 232 #endif // wxUSE_TOOLTIPS
 233     }
 234
 235     return ::CallWindowProc(CASTWNDPROC gs_wndprocEdit, hWnd, message, wParam, lParam);
 236 }
 237
 238 // ----------------------------------------------------------------------------
 239 // wxComboBox callbacks
 240 // ----------------------------------------------------------------------------
 241
 242 WXLRESULT wxComboBox::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam)
 243 {
 244     // handle WM_CTLCOLOR messages from our EDIT control to be able to set its
 245     // colour correctly (to be the same as our own one)
 246     switch ( nMsg )
 247     {
 248         case CB_SETCURSEL:
 249             // Selection was set with SetSelection.  Update the value too.
 250             if ((int)wParam > GetCount())
 251                 m_value = wxEmptyString;
 252             else
 253                 m_value = GetString(wParam);
 254             break;
 255     }
 256
 257     return wxChoice::MSWWindowProc(nMsg, wParam, lParam);
 258 }
 259
 260 bool wxComboBox::MSWProcessEditMsg(WXUINT msg, WXWPARAM wParam, WXLPARAM lParam)
 261 {
 262     switch ( msg )
 263     {
 264         case WM_CHAR:
 265             // for compatibility with wxTextCtrl, generate a special message
 266             // when Enter is pressed
 267             if ( wParam == VK_RETURN )
 268             {
 269                 wxCommandEvent event(wxEVT_COMMAND_TEXT_ENTER, m_windowId);
 270                 InitCommandEvent(event);
 271                 event.SetString(GetValue());
 272                 event.SetInt(GetSelection());
 273                 if ( ProcessCommand(event) )
 274                 {
 275                     // don't let the event through to the native control
 276                     // because it doesn't need it and may generate an annoying
 277                     // beep if it gets it
 278                     return true;
 279                 }
 280             }
 281
 282             return HandleChar(wParam, lParam, true /* isASCII */);
 283
 284         case WM_KEYDOWN:
 285             return HandleKeyDown(wParam, lParam);
 286
 287         case WM_KEYUP:
 288             return HandleKeyUp(wParam, lParam);
 289
 290         case WM_SETFOCUS:
 291             return HandleSetFocus((WXHWND)wParam);
 292
 293         case WM_KILLFOCUS:
 294             return HandleKillFocus((WXHWND)wParam);
 295     }
 296
 297     return false;
 298 }
 299
 300 bool wxComboBox::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 301 {
 302     wxString value;
 303     int sel = -1;
 304     switch ( param )
 305     {
 306         case CBN_SELCHANGE:
 307             sel = GetSelection();
 308
 309             // somehow we get 2 CBN_SELCHANGE events with the same index when
 310             // the user selects an item in the combobox -- ignore duplicates
 311             if ( sel > -1 && sel != m_selectionOld )
 312             {
 313                 m_selectionOld = sel;
 314
 315                 // GetValue() would still return the old value from here but
 316                 // according to the docs we should return the new value if the
 317                 // user calls it in his event handler, so update internal
 318                 // m_value
 319                 m_value = GetString(sel);
 320
 321                 wxCommandEvent event(wxEVT_COMMAND_COMBOBOX_SELECTED, GetId());
 322                 event.SetInt(sel);
 323                 event.SetEventObject(this);
 324                 event.SetString(m_value);
 325                 ProcessCommand(event);
 326             }
 327             else // no valid selection
 328             {
 329                 m_selectionOld = sel;
 330
 331                 // hence no EVT_TEXT neither
 332                 break;
 333             }
 334
 335             // fall through: for compability with wxGTK, also send the text
 336             // update event when the selection changes (this also seems more
 337             // logical as the text does change)
 338
 339         case CBN_EDITCHANGE:
 340             {
 341                 wxCommandEvent event(wxEVT_COMMAND_TEXT_UPDATED, GetId());
 342
 343                 // if sel != -1, value was initialized above (and we can't use
 344                 // GetValue() here as it would return the old selection and we
 345                 // want the new one)
 346                 if ( sel == -1 )
 347                 {
 348                     m_value = wxGetWindowText(GetHwnd());
 349                 }
 350                 else // we're synthesizing text updated event from sel change
 351                 {
 352                     // We need to retrieve the current selection because the
 353                     // user may have changed it in the previous handler (for
 354                     // CBN_SELCHANGE above).
 355                     sel = GetSelection();
 356                     if ( sel > -1 )
 357                     {
 358                         m_value = GetString(sel);
 359                     }
 360                 }
 361
 362                 event.SetString(m_value);
 363                 event.SetEventObject(this);
 364                 ProcessCommand(event);
 365             }
 366             break;
 367     }
 368
 369     // there is no return value for the CBN_ notifications, so always return
 370     // false from here to pass the message to DefWindowProc()
 371     return false;
 372 }
 373
 374 WXHWND wxComboBox::GetEditHWND() const
 375 {
 376     // this function should not be called for wxCB_READONLY controls, it is
 377     // the callers responsability to check this
 378     wxASSERT_MSG( !(GetWindowStyle() & wxCB_READONLY),
 379                   _T("read-only combobox doesn't have any edit control") );
 380
 381     POINT pt;
 382     pt.x = pt.y = 4;
 383     HWND hwndEdit = ::ChildWindowFromPoint(GetHwnd(), pt);
 384     if ( !hwndEdit || hwndEdit == GetHwnd() )
 385     {
 386         wxFAIL_MSG(_T("not read only combobox without edit control?"));
 387     }
 388
 389     return (WXHWND)hwndEdit;
 390 }
 391
 392 // ----------------------------------------------------------------------------
 393 // wxComboBox creation
 394 // ----------------------------------------------------------------------------
 395
 396 bool wxComboBox::Create(wxWindow *parent, wxWindowID id,
 397                         const wxString& value,
 398                         const wxPoint& pos,
 399                         const wxSize& size,
 400                         int n, const wxString choices[],
 401                         long style,
 402                         const wxValidator& validator,
 403                         const wxString& name)
 404 {
 405     // pretend that wxComboBox is hidden while it is positioned and resized and
 406     // show it only right before leaving this method because otherwise there is
 407     // some noticeable flicker while the control rearranges itself
 408     m_isShown = false;
 409
 410     if ( !CreateAndInit(parent, id, pos, size, n, choices, style,
 411                         validator, name) )
 412         return false;
 413
 414     // we shouldn't call SetValue() for an empty string because this would
 415     // (correctly) result in an assert with a read only combobox and is useless
 416     // for the other ones anyhow
 417     if ( !value.empty() )
 418         SetValue(value);
 419
 420     // a (not read only) combobox is, in fact, 2 controls: the combobox itself
 421     // and an edit control inside it and if we want to catch events from this
 422     // edit control, we must subclass it as well
 423     if ( !(style & wxCB_READONLY) )
 424     {
 425         gs_wndprocEdit = wxSetWindowProc((HWND)GetEditHWND(),
 426                                          wxComboEditWndProc);
 427     }
 428
 429     // and finally, show the control
 430     Show(true);
 431
 432     return true;
 433 }
 434
 435 bool wxComboBox::Create(wxWindow *parent, wxWindowID id,
 436                         const wxString& value,
 437                         const wxPoint& pos,
 438                         const wxSize& size,
 439                         const wxArrayString& choices,
 440                         long style,
 441                         const wxValidator& validator,
 442                         const wxString& name)
 443 {
 444     wxCArrayString chs(choices);
 445     return Create(parent, id, value, pos, size, chs.GetCount(),
 446                   chs.GetStrings(), style, validator, name);
 447 }
 448
 449 WXDWORD wxComboBox::MSWGetStyle(long style, WXDWORD *exstyle) const
 450 {
 451     // we never have an external border
 452     WXDWORD msStyle = wxChoice::MSWGetStyle
 453                       (
 454                         (style & ~wxBORDER_MASK) | wxBORDER_NONE, exstyle
 455                       );
 456
 457     // remove the style always added by wxChoice
 458     msStyle &= ~CBS_DROPDOWNLIST;
 459
 460     if ( style & wxCB_READONLY )
 461         msStyle |= CBS_DROPDOWNLIST;
 462 #ifndef __WXWINCE__
 463     else if ( style & wxCB_SIMPLE )
 464         msStyle |= CBS_SIMPLE; // A list (shown always) and edit control
 465 #endif
 466     else
 467         msStyle |= CBS_DROPDOWN;
 468
 469     // there is no reason to not always use CBS_AUTOHSCROLL, so do use it
 470     msStyle |= CBS_AUTOHSCROLL;
 471
 472     // NB: we used to also add CBS_NOINTEGRALHEIGHT here but why?
 473
 474     return msStyle;
 475 }
 476
 477 // ----------------------------------------------------------------------------
 478 // wxComboBox text control-like methods
 479 // ----------------------------------------------------------------------------
 480
 481 void wxComboBox::SetValue(const wxString& value)
 482 {
 483     if ( HasFlag(wxCB_READONLY) )
 484         SetStringSelection(value);
 485     else
 486         SetWindowText(GetHwnd(), value.c_str());
 487
 488     m_value = value;
 489     m_selectionOld = GetSelection();
 490 }
 491
 492 // Clipboard operations
 493 void wxComboBox::Copy()
 494 {
 495     SendMessage(GetHwnd(), WM_COPY, 0, 0L);
 496 }
 497
 498 void wxComboBox::Cut()
 499 {
 500     SendMessage(GetHwnd(), WM_CUT, 0, 0L);
 501 }
 502
 503 void wxComboBox::Paste()
 504 {
 505     SendMessage(GetHwnd(), WM_PASTE, 0, 0L);
 506 }
 507
 508 void wxComboBox::Undo()
 509 {
 510     if (CanUndo())
 511     {
 512         HWND hEditWnd = (HWND) GetEditHWND() ;
 513         if ( hEditWnd )
 514             ::SendMessage(hEditWnd, EM_UNDO, 0, 0);
 515     }
 516 }
 517
 518 void wxComboBox::Redo()
 519 {
 520     if (CanUndo())
 521     {
 522         // Same as Undo, since Undo undoes the undo, i.e. a redo.
 523         HWND hEditWnd = (HWND) GetEditHWND() ;
 524         if ( hEditWnd )
 525             ::SendMessage(hEditWnd, EM_UNDO, 0, 0);
 526     }
 527 }
 528
 529 void wxComboBox::SelectAll()
 530 {
 531     SetSelection(0, GetLastPosition());
 532 }
 533
 534 bool wxComboBox::CanUndo() const
 535 {
 536     HWND hEditWnd = (HWND) GetEditHWND() ;
 537     if ( hEditWnd )
 538         return ::SendMessage(hEditWnd, EM_CANUNDO, 0, 0) != 0;
 539     else
 540         return false;
 541 }
 542
 543 bool wxComboBox::CanRedo() const
 544 {
 545     HWND hEditWnd = (HWND) GetEditHWND() ;
 546     if ( hEditWnd )
 547         return ::SendMessage(hEditWnd, EM_CANUNDO, 0, 0) != 0;
 548     else
 549         return false;
 550 }
 551
 552 bool wxComboBox::HasSelection() const
 553 {
 554     long from, to;
 555     GetSelection(&from, &to);
 556     return from != to;
 557 }
 558
 559 bool wxComboBox::CanCopy() const
 560 {
 561     // Can copy if there's a selection
 562     return HasSelection();
 563 }
 564
 565 bool wxComboBox::CanCut() const
 566 {
 567     return CanCopy() && IsEditable();
 568 }
 569
 570 bool wxComboBox::CanPaste() const
 571 {
 572     if ( !IsEditable() )
 573         return false;
 574
 575     // Standard edit control: check for straight text on clipboard
 576     if ( !::OpenClipboard(GetHwndOf(wxTheApp->GetTopWindow())) )
 577         return false;
 578
 579     bool isTextAvailable = ::IsClipboardFormatAvailable(CF_TEXT) != 0;
 580     ::CloseClipboard();
 581
 582     return isTextAvailable;
 583 }
 584
 585 bool wxComboBox::IsEditable() const
 586 {
 587     return !HasFlag(wxCB_READONLY);
 588 }
 589
 590 void wxComboBox::SetEditable(bool WXUNUSED(editable))
 591 {
 592   // Can't implement in MSW?
 593 //  HWND hWnd = GetHwnd();
 594 //  SendMessage(hWnd, EM_SETREADONLY, (WPARAM)!editable, (LPARAM)0L);
 595 }
 596
 597 void wxComboBox::SetInsertionPoint(long pos)
 598 {
 599     if ( GetWindowStyle() & wxCB_READONLY )
 600         return;
 601
 602 #ifdef __WIN32__
 603     HWND hWnd = GetHwnd();
 604     ::SendMessage(hWnd, CB_SETEDITSEL, 0, MAKELPARAM(pos, pos));
 605     HWND hEditWnd = (HWND) GetEditHWND() ;
 606     if ( hEditWnd )
 607     {
 608         // Scroll insertion point into view
 609         SendMessage(hEditWnd, EM_SCROLLCARET, (WPARAM)0, (LPARAM)0);
 610         // Why is this necessary? (Copied from wxTextCtrl::SetInsertionPoint)
 611         SendMessage(hEditWnd, EM_REPLACESEL, 0, (LPARAM) wxEmptyString);
 612     }
 613 #endif // __WIN32__
 614 }
 615
 616 void wxComboBox::SetInsertionPointEnd()
 617 {
 618     // setting insertion point doesn't make sense for read only comboboxes
 619     if ( !(GetWindowStyle() & wxCB_READONLY) )
 620     {
 621         long pos = GetLastPosition();
 622         SetInsertionPoint(pos);
 623     }
 624 }
 625
 626 long wxComboBox::GetInsertionPoint() const
 627 {
 628 #ifdef __WIN32__
 629     DWORD Pos=(DWORD)SendMessage(GetHwnd(), CB_GETEDITSEL, 0, 0L);
 630     return Pos&0xFFFF;
 631 #else
 632     return 0;
 633 #endif
 634 }
 635
 636 long wxComboBox::GetLastPosition() const
 637 {
 638     HWND hEditWnd = (HWND) GetEditHWND();
 639
 640     // Get number of characters in the last (only) line. We'll add this to the character
 641     // index for the last line, 1st position.
 642     int lineLength = (int)SendMessage(hEditWnd, EM_LINELENGTH, (WPARAM) 0, (LPARAM)0L);
 643
 644     return (long)(lineLength);
 645 }
 646
 647 void wxComboBox::Replace(long from, long to, const wxString& value)
 648 {
 649 #if wxUSE_CLIPBOARD
 650     Remove(from, to);
 651
 652     // Now replace with 'value', by pasting.
 653     wxSetClipboardData(wxDF_TEXT, (wxObject *)(const wxChar *)value, 0, 0);
 654
 655     // Paste into edit control
 656     SendMessage(GetHwnd(), WM_PASTE, (WPARAM)0, (LPARAM)0L);
 657 #endif
 658 }
 659
 660 void wxComboBox::Remove(long from, long to)
 661 {
 662     // Set selection and remove it
 663     SetSelection(from, to);
 664     SendMessage(GetHwnd(), WM_CUT, (WPARAM)0, (LPARAM)0);
 665 }
 666
 667 void wxComboBox::SetSelection(long from, long to)
 668 {
 669     HWND hWnd = GetHwnd();
 670     long fromChar = from;
 671     long toChar = to;
 672     // if from and to are both -1, it means
 673     // (in wxWidgets) that all text should be selected.
 674     // This translates into Windows convention
 675     if ((from == -1) && (to == -1))
 676     {
 677       fromChar = 0;
 678       toChar = -1;
 679     }
 680
 681     if ( SendMessage(hWnd, CB_SETEDITSEL, (WPARAM)0, (LPARAM)MAKELONG(fromChar, toChar)) == CB_ERR )
 682     {
 683         wxLogDebug(_T("CB_SETEDITSEL failed"));
 684     }
 685 }
 686
 687 void wxComboBox::GetSelection(long* from, long* to) const
 688 {
 689     DWORD dwStart, dwEnd;
 690     ::SendMessage(GetHwnd(), CB_GETEDITSEL, (WPARAM)&dwStart, (LPARAM)&dwEnd);
 691
 692     *from = dwStart;
 693     *to = dwEnd;
 694 }
 695
 696 int wxComboBox::GetSelection() const
 697 {
 698     return wxChoice::GetSelection();
 699 }
 700
 701 // ----------------------------------------------------------------------------
 702 // standard event handling
 703 // ----------------------------------------------------------------------------
 704
 705 void wxComboBox::OnCut(wxCommandEvent& WXUNUSED(event))
 706 {
 707     Cut();
 708 }
 709
 710 void wxComboBox::OnCopy(wxCommandEvent& WXUNUSED(event))
 711 {
 712     Copy();
 713 }
 714
 715 void wxComboBox::OnPaste(wxCommandEvent& WXUNUSED(event))
 716 {
 717     Paste();
 718 }
 719
 720 void wxComboBox::OnUndo(wxCommandEvent& WXUNUSED(event))
 721 {
 722     Undo();
 723 }
 724
 725 void wxComboBox::OnRedo(wxCommandEvent& WXUNUSED(event))
 726 {
 727     Redo();
 728 }
 729
 730 void wxComboBox::OnDelete(wxCommandEvent& WXUNUSED(event))
 731 {
 732     long from, to;
 733     GetSelection(& from, & to);
 734     if (from != -1 && to != -1)
 735         Remove(from, to);
 736 }
 737
 738 void wxComboBox::OnSelectAll(wxCommandEvent& WXUNUSED(event))
 739 {
 740     SetSelection(-1, -1);
 741 }
 742
 743 void wxComboBox::OnUpdateCut(wxUpdateUIEvent& event)
 744 {
 745     event.Enable( CanCut() );
 746 }
 747
 748 void wxComboBox::OnUpdateCopy(wxUpdateUIEvent& event)
 749 {
 750     event.Enable( CanCopy() );
 751 }
 752
 753 void wxComboBox::OnUpdatePaste(wxUpdateUIEvent& event)
 754 {
 755     event.Enable( CanPaste() );
 756 }
 757
 758 void wxComboBox::OnUpdateUndo(wxUpdateUIEvent& event)
 759 {
 760     event.Enable( CanUndo() );
 761 }
 762
 763 void wxComboBox::OnUpdateRedo(wxUpdateUIEvent& event)
 764 {
 765     event.Enable( CanRedo() );
 766 }
 767
 768 void wxComboBox::OnUpdateDelete(wxUpdateUIEvent& event)
 769 {
 770     event.Enable(HasSelection() && IsEditable()) ;
 771 }
 772
 773 void wxComboBox::OnUpdateSelectAll(wxUpdateUIEvent& event)
 774 {
 775     event.Enable(GetLastPosition() > 0);
 776 }
 777
 778 #endif // wxUSE_COMBOBOX
 779