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             m_selectionOld = -1;
 255             break;
 256     }
 257
 258     return wxChoice::MSWWindowProc(nMsg, wParam, lParam);
 259 }
 260
 261 bool wxComboBox::MSWProcessEditMsg(WXUINT msg, WXWPARAM wParam, WXLPARAM lParam)
 262 {
 263     switch ( msg )
 264     {
 265         case WM_CHAR:
 266             // for compatibility with wxTextCtrl, generate a special message
 267             // when Enter is pressed
 268             if ( wParam == VK_RETURN )
 269             {
 270                 wxCommandEvent event(wxEVT_COMMAND_TEXT_ENTER, m_windowId);
 271                 InitCommandEvent(event);
 272                 event.SetString(GetValue());
 273                 event.SetInt(GetSelection());
 274                 if ( ProcessCommand(event) )
 275                 {
 276                     // don't let the event through to the native control
 277                     // because it doesn't need it and may generate an annoying
 278                     // beep if it gets it
 279                     return true;
 280                 }
 281             }
 282
 283             return HandleChar(wParam, lParam, true /* isASCII */);
 284
 285         case WM_KEYDOWN:
 286             return HandleKeyDown(wParam, lParam);
 287
 288         case WM_KEYUP:
 289             return HandleKeyUp(wParam, lParam);
 290
 291         case WM_SETFOCUS:
 292             return HandleSetFocus((WXHWND)wParam);
 293
 294         case WM_KILLFOCUS:
 295             return HandleKillFocus((WXHWND)wParam);
 296     }
 297
 298     return false;
 299 }
 300
 301 bool wxComboBox::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 302 {
 303     wxString value;
 304     int sel = -1;
 305     switch ( param )
 306     {
 307         case CBN_SELENDOK:
 308         case CBN_SELCHANGE:
 309             sel = GetSelection();
 310
 311             // we may sometimes get 2 CBN_SELCHANGE events or a CBN_SELENDOK
 312             // before CBN_SELCHANGE with the same index when the user selects
 313             // an item in the combobox -- ignore duplicates
 314             if ( sel > -1 && sel != m_selectionOld )
 315             {
 316                 m_selectionOld = sel;
 317
 318                 // GetValue() would still return the old value from here but
 319                 // according to the docs we should return the new value if the
 320                 // user calls it in his event handler, so update internal
 321                 // m_value
 322                 m_value = GetString(sel);
 323
 324                 wxCommandEvent event(wxEVT_COMMAND_COMBOBOX_SELECTED, GetId());
 325                 event.SetInt(sel);
 326                 event.SetEventObject(this);
 327                 event.SetString(m_value);
 328                 ProcessCommand(event);
 329             }
 330             else // no valid selection
 331             {
 332                 m_selectionOld = sel;
 333
 334                 // hence no EVT_TEXT neither
 335                 break;
 336             }
 337
 338             // fall through: for compability with wxGTK, also send the text
 339             // update event when the selection changes (this also seems more
 340             // logical as the text does change)
 341
 342         case CBN_EDITCHANGE:
 343             {
 344                 wxCommandEvent event(wxEVT_COMMAND_TEXT_UPDATED, GetId());
 345
 346                 // if sel != -1, value was initialized above (and we can't use
 347                 // GetValue() here as it would return the old selection and we
 348                 // want the new one)
 349                 if ( sel == -1 )
 350                 {
 351                     m_value = wxGetWindowText(GetHwnd());
 352                     m_selectionOld = -1;
 353                 }
 354                 else // we're synthesizing text updated event from sel change
 355                 {
 356                     // We need to retrieve the current selection because the
 357                     // user may have changed it in the previous handler (for
 358                     // CBN_SELCHANGE above).
 359                     sel = GetSelection();
 360                     if ( sel > -1 )
 361                     {
 362                         m_value = GetString(sel);
 363                     }
 364                 }
 365
 366                 event.SetString(m_value);
 367                 event.SetEventObject(this);
 368                 ProcessCommand(event);
 369             }
 370             break;
 371     }
 372
 373     // there is no return value for the CBN_ notifications, so always return
 374     // false from here to pass the message to DefWindowProc()
 375     return false;
 376 }
 377
 378 WXHWND wxComboBox::GetEditHWND() const
 379 {
 380     // this function should not be called for wxCB_READONLY controls, it is
 381     // the callers responsability to check this
 382     wxASSERT_MSG( !(GetWindowStyle() & wxCB_READONLY),
 383                   _T("read-only combobox doesn't have any edit control") );
 384
 385     POINT pt;
 386     pt.x = pt.y = 4;
 387     HWND hwndEdit = ::ChildWindowFromPoint(GetHwnd(), pt);
 388     if ( !hwndEdit || hwndEdit == GetHwnd() )
 389     {
 390         wxFAIL_MSG(_T("not read only combobox without edit control?"));
 391     }
 392
 393     return (WXHWND)hwndEdit;
 394 }
 395
 396 // ----------------------------------------------------------------------------
 397 // wxComboBox creation
 398 // ----------------------------------------------------------------------------
 399
 400 bool wxComboBox::Create(wxWindow *parent, wxWindowID id,
 401                         const wxString& value,
 402                         const wxPoint& pos,
 403                         const wxSize& size,
 404                         int n, const wxString choices[],
 405                         long style,
 406                         const wxValidator& validator,
 407                         const wxString& name)
 408 {
 409     // pretend that wxComboBox is hidden while it is positioned and resized and
 410     // show it only right before leaving this method because otherwise there is
 411     // some noticeable flicker while the control rearranges itself
 412     m_isShown = false;
 413
 414     if ( !CreateAndInit(parent, id, pos, size, n, choices, style,
 415                         validator, name) )
 416         return false;
 417
 418     // we shouldn't call SetValue() for an empty string because this would
 419     // (correctly) result in an assert with a read only combobox and is useless
 420     // for the other ones anyhow
 421     if ( !value.empty() )
 422         SetValue(value);
 423
 424     // a (not read only) combobox is, in fact, 2 controls: the combobox itself
 425     // and an edit control inside it and if we want to catch events from this
 426     // edit control, we must subclass it as well
 427     if ( !(style & wxCB_READONLY) )
 428     {
 429         gs_wndprocEdit = wxSetWindowProc((HWND)GetEditHWND(),
 430                                          wxComboEditWndProc);
 431     }
 432
 433     // and finally, show the control
 434     Show(true);
 435
 436     return true;
 437 }
 438
 439 bool wxComboBox::Create(wxWindow *parent, wxWindowID id,
 440                         const wxString& value,
 441                         const wxPoint& pos,
 442                         const wxSize& size,
 443                         const wxArrayString& choices,
 444                         long style,
 445                         const wxValidator& validator,
 446                         const wxString& name)
 447 {
 448     wxCArrayString chs(choices);
 449     return Create(parent, id, value, pos, size, chs.GetCount(),
 450                   chs.GetStrings(), style, validator, name);
 451 }
 452
 453 WXDWORD wxComboBox::MSWGetStyle(long style, WXDWORD *exstyle) const
 454 {
 455     // we never have an external border
 456     WXDWORD msStyle = wxChoice::MSWGetStyle
 457                       (
 458                         (style & ~wxBORDER_MASK) | wxBORDER_NONE, exstyle
 459                       );
 460
 461     // usually WS_TABSTOP is added by wxControl::MSWGetStyle() but as we're
 462     // created hidden (see Create() above), it is not done for us but we still
 463     // want to have this style
 464     msStyle |= WS_TABSTOP;
 465
 466     // remove the style always added by wxChoice
 467     msStyle &= ~CBS_DROPDOWNLIST;
 468
 469     if ( style & wxCB_READONLY )
 470         msStyle |= CBS_DROPDOWNLIST;
 471 #ifndef __WXWINCE__
 472     else if ( style & wxCB_SIMPLE )
 473         msStyle |= CBS_SIMPLE; // A list (shown always) and edit control
 474 #endif
 475     else
 476         msStyle |= CBS_DROPDOWN;
 477
 478     // there is no reason to not always use CBS_AUTOHSCROLL, so do use it
 479     msStyle |= CBS_AUTOHSCROLL;
 480
 481     // NB: we used to also add CBS_NOINTEGRALHEIGHT here but why?
 482
 483     return msStyle;
 484 }
 485
 486 // ----------------------------------------------------------------------------
 487 // wxComboBox geometry
 488 // ----------------------------------------------------------------------------
 489
 490 void
 491 wxComboBox::DoSetSize(int x, int y, int width, int height, int sizeFlags)
 492 {
 493     // work around a Windows bug (search for "Bug in Windows Combobox" in
 494     // Google Groups): resizing the combobox changes the selection in it
 495     long fromOld, toOld;
 496     GetSelection(&fromOld, &toOld);
 497
 498     wxChoice::DoSetSize(x, y, width, height, sizeFlags);
 499
 500     long fromNew, toNew;
 501     GetSelection(&fromNew, &toNew);
 502
 503     if ( fromOld != fromNew || toOld != toNew )
 504     {
 505         SetSelection(fromOld, toOld);
 506     }
 507 }
 508
 509 // ----------------------------------------------------------------------------
 510 // wxComboBox text control-like methods
 511 // ----------------------------------------------------------------------------
 512
 513 void wxComboBox::SetValue(const wxString& value)
 514 {
 515     if ( HasFlag(wxCB_READONLY) )
 516         SetStringSelection(value);
 517     else
 518         SetWindowText(GetHwnd(), value.c_str());
 519
 520     m_value = value;
 521     m_selectionOld = GetSelection();
 522 }
 523
 524 // Clipboard operations
 525 void wxComboBox::Copy()
 526 {
 527     SendMessage(GetHwnd(), WM_COPY, 0, 0L);
 528 }
 529
 530 void wxComboBox::Cut()
 531 {
 532     SendMessage(GetHwnd(), WM_CUT, 0, 0L);
 533 }
 534
 535 void wxComboBox::Paste()
 536 {
 537     SendMessage(GetHwnd(), WM_PASTE, 0, 0L);
 538 }
 539
 540 void wxComboBox::Undo()
 541 {
 542     if (CanUndo())
 543     {
 544         HWND hEditWnd = (HWND) GetEditHWND() ;
 545         if ( hEditWnd )
 546             ::SendMessage(hEditWnd, EM_UNDO, 0, 0);
 547     }
 548 }
 549
 550 void wxComboBox::Redo()
 551 {
 552     if (CanUndo())
 553     {
 554         // Same as Undo, since Undo undoes the undo, i.e. a redo.
 555         HWND hEditWnd = (HWND) GetEditHWND() ;
 556         if ( hEditWnd )
 557             ::SendMessage(hEditWnd, EM_UNDO, 0, 0);
 558     }
 559 }
 560
 561 void wxComboBox::SelectAll()
 562 {
 563     SetSelection(0, GetLastPosition());
 564 }
 565
 566 bool wxComboBox::CanUndo() const
 567 {
 568     if (!IsEditable())
 569         return false;
 570
 571     HWND hEditWnd = (HWND) GetEditHWND() ;
 572     if ( hEditWnd )
 573         return ::SendMessage(hEditWnd, EM_CANUNDO, 0, 0) != 0;
 574     else
 575         return false;
 576 }
 577
 578 bool wxComboBox::CanRedo() const
 579 {
 580     if (!IsEditable())
 581         return false;
 582
 583     HWND hEditWnd = (HWND) GetEditHWND() ;
 584     if ( hEditWnd )
 585         return ::SendMessage(hEditWnd, EM_CANUNDO, 0, 0) != 0;
 586     else
 587         return false;
 588 }
 589
 590 bool wxComboBox::HasSelection() const
 591 {
 592     long from, to;
 593     GetSelection(&from, &to);
 594     return from != to;
 595 }
 596
 597 bool wxComboBox::CanCopy() const
 598 {
 599     // Can copy if there's a selection
 600     return HasSelection();
 601 }
 602
 603 bool wxComboBox::CanCut() const
 604 {
 605     return IsEditable() && CanCopy() ;
 606 }
 607
 608 bool wxComboBox::CanPaste() const
 609 {
 610     if ( !IsEditable() )
 611         return false;
 612
 613     // Standard edit control: check for straight text on clipboard
 614     if ( !::OpenClipboard(GetHwndOf(wxTheApp->GetTopWindow())) )
 615         return false;
 616
 617     bool isTextAvailable = ::IsClipboardFormatAvailable(CF_TEXT) != 0;
 618     ::CloseClipboard();
 619
 620     return isTextAvailable;
 621 }
 622
 623 bool wxComboBox::IsEditable() const
 624 {
 625     return !HasFlag(wxCB_READONLY);
 626 }
 627
 628 void wxComboBox::SetEditable(bool WXUNUSED(editable))
 629 {
 630   // Can't implement in MSW?
 631 //  HWND hWnd = GetHwnd();
 632 //  SendMessage(hWnd, EM_SETREADONLY, (WPARAM)!editable, (LPARAM)0L);
 633 }
 634
 635 void wxComboBox::SetInsertionPoint(long pos)
 636 {
 637     if ( GetWindowStyle() & wxCB_READONLY )
 638         return;
 639
 640 #ifdef __WIN32__
 641     HWND hWnd = GetHwnd();
 642     ::SendMessage(hWnd, CB_SETEDITSEL, 0, MAKELPARAM(pos, pos));
 643     HWND hEditWnd = (HWND) GetEditHWND() ;
 644     if ( hEditWnd )
 645     {
 646         // Scroll insertion point into view
 647         SendMessage(hEditWnd, EM_SCROLLCARET, (WPARAM)0, (LPARAM)0);
 648         // Why is this necessary? (Copied from wxTextCtrl::SetInsertionPoint)
 649         SendMessage(hEditWnd, EM_REPLACESEL, 0, (LPARAM) wxEmptyString);
 650     }
 651 #endif // __WIN32__
 652 }
 653
 654 void wxComboBox::SetInsertionPointEnd()
 655 {
 656     // setting insertion point doesn't make sense for read only comboboxes
 657     if ( !(GetWindowStyle() & wxCB_READONLY) )
 658     {
 659         wxTextPos pos = GetLastPosition();
 660         SetInsertionPoint(pos);
 661     }
 662 }
 663
 664 long wxComboBox::GetInsertionPoint() const
 665 {
 666     // CB_GETEDITSEL returns the index of the last character after selection in
 667     // its high-order word
 668     DWORD pos= (DWORD)::SendMessage(GetHwnd(), CB_GETEDITSEL, 0, 0L);
 669
 670     return HIWORD(pos);
 671 }
 672
 673 wxTextPos wxComboBox::GetLastPosition() const
 674 {
 675     HWND hEditWnd = (HWND) GetEditHWND();
 676
 677     // Get number of characters in the last (only) line. We'll add this to the character
 678     // index for the last line, 1st position.
 679     wxTextPos lineLength = (wxTextPos)SendMessage(hEditWnd, EM_LINELENGTH, (WPARAM) 0, (LPARAM)0L);
 680
 681     return lineLength;
 682 }
 683
 684 void wxComboBox::Replace(long from, long to, const wxString& value)
 685 {
 686 #if wxUSE_CLIPBOARD
 687     Remove(from, to);
 688
 689     // Now replace with 'value', by pasting.
 690     wxSetClipboardData(wxDF_TEXT, (wxObject *)(const wxChar *)value, 0, 0);
 691
 692     // Paste into edit control
 693     SendMessage(GetHwnd(), WM_PASTE, (WPARAM)0, (LPARAM)0L);
 694 #endif
 695 }
 696
 697 void wxComboBox::Remove(long from, long to)
 698 {
 699     // Set selection and remove it
 700     SetSelection(from, to);
 701     SendMessage(GetHwnd(), WM_CUT, (WPARAM)0, (LPARAM)0);
 702 }
 703
 704 void wxComboBox::SetSelection(long from, long to)
 705 {
 706     // if from and to are both -1, it means (in wxWidgets) that all text should
 707     // be selected, translate this into Windows convention
 708     if ( (from == -1) && (to == -1) )
 709     {
 710         from = 0;
 711     }
 712
 713     if ( SendMessage(GetHwnd(), CB_SETEDITSEL,
 714                      0, (LPARAM)MAKELONG(from, to)) == CB_ERR )
 715     {
 716         wxLogDebug(_T("CB_SETEDITSEL failed"));
 717     }
 718 }
 719
 720 void wxComboBox::GetSelection(long* from, long* to) const
 721 {
 722     DWORD dwStart, dwEnd;
 723     if ( ::SendMessage(GetHwnd(), CB_GETEDITSEL,
 724                        (WPARAM)&dwStart, (LPARAM)&dwEnd) == CB_ERR )
 725     {
 726         *from =
 727         *to = 0;
 728     }
 729     else
 730     {
 731         *from = dwStart;
 732         *to = dwEnd;
 733     }
 734 }
 735
 736 int wxComboBox::GetSelection() const
 737 {
 738     return wxChoice::GetSelection();
 739 }
 740
 741 // ----------------------------------------------------------------------------
 742 // standard event handling
 743 // ----------------------------------------------------------------------------
 744
 745 void wxComboBox::OnCut(wxCommandEvent& WXUNUSED(event))
 746 {
 747     Cut();
 748 }
 749
 750 void wxComboBox::OnCopy(wxCommandEvent& WXUNUSED(event))
 751 {
 752     Copy();
 753 }
 754
 755 void wxComboBox::OnPaste(wxCommandEvent& WXUNUSED(event))
 756 {
 757     Paste();
 758 }
 759
 760 void wxComboBox::OnUndo(wxCommandEvent& WXUNUSED(event))
 761 {
 762     Undo();
 763 }
 764
 765 void wxComboBox::OnRedo(wxCommandEvent& WXUNUSED(event))
 766 {
 767     Redo();
 768 }
 769
 770 void wxComboBox::OnDelete(wxCommandEvent& WXUNUSED(event))
 771 {
 772     long from, to;
 773     GetSelection(& from, & to);
 774     if (from != -1 && to != -1)
 775         Remove(from, to);
 776 }
 777
 778 void wxComboBox::OnSelectAll(wxCommandEvent& WXUNUSED(event))
 779 {
 780     SetSelection(-1, -1);
 781 }
 782
 783 void wxComboBox::OnUpdateCut(wxUpdateUIEvent& event)
 784 {
 785     event.Enable( CanCut() );
 786 }
 787
 788 void wxComboBox::OnUpdateCopy(wxUpdateUIEvent& event)
 789 {
 790     event.Enable( CanCopy() );
 791 }
 792
 793 void wxComboBox::OnUpdatePaste(wxUpdateUIEvent& event)
 794 {
 795     event.Enable( CanPaste() );
 796 }
 797
 798 void wxComboBox::OnUpdateUndo(wxUpdateUIEvent& event)
 799 {
 800     event.Enable( CanUndo() );
 801 }
 802
 803 void wxComboBox::OnUpdateRedo(wxUpdateUIEvent& event)
 804 {
 805     event.Enable( CanRedo() );
 806 }
 807
 808 void wxComboBox::OnUpdateDelete(wxUpdateUIEvent& event)
 809 {
 810     event.Enable(HasSelection() && IsEditable()) ;
 811 }
 812
 813 void wxComboBox::OnUpdateSelectAll(wxUpdateUIEvent& event)
 814 {
 815     event.Enable(GetLastPosition() > 0);
 816 }
 817
 818 #endif // wxUSE_COMBOBOX
 819