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