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