src/msw/combobox.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/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 // For compilers that support precompilation, includes "wx.h".
  21 #include "wx/wxprec.h"
  22
  23 #ifdef __BORLANDC__
  24     #pragma hdrstop
  25 #endif
  26
  27 #if wxUSE_COMBOBOX
  28
  29 #include "wx/combobox.h"
  30
  31 #ifndef WX_PRECOMP
  32     #include "wx/settings.h"
  33     #include "wx/log.h"
  34     // for wxEVT_COMMAND_TEXT_ENTER
  35     #include "wx/textctrl.h"
  36     #include "wx/app.h"
  37 #endif
  38
  39 #include "wx/brush.h"
  40 #include "wx/clipbrd.h"
  41 #include "wx/msw/private.h"
  42
  43 #if wxUSE_TOOLTIPS
  44     #if !defined(__GNUWIN32_OLD__) || defined(__CYGWIN10__)
  45         #include <commctrl.h>
  46     #endif
  47     #include "wx/tooltip.h"
  48 #endif // wxUSE_TOOLTIPS
  49
  50 // ----------------------------------------------------------------------------
  51 // wxWin macros
  52 // ----------------------------------------------------------------------------
  53
  54 #if wxUSE_EXTENDED_RTTI
  55 WX_DEFINE_FLAGS( wxComboBoxStyle )
  56
  57 wxBEGIN_FLAGS( wxComboBoxStyle )
  58     // new style border flags, we put them first to
  59     // use them for streaming out
  60     wxFLAGS_MEMBER(wxBORDER_SIMPLE)
  61     wxFLAGS_MEMBER(wxBORDER_SUNKEN)
  62     wxFLAGS_MEMBER(wxBORDER_DOUBLE)
  63     wxFLAGS_MEMBER(wxBORDER_RAISED)
  64     wxFLAGS_MEMBER(wxBORDER_STATIC)
  65     wxFLAGS_MEMBER(wxBORDER_NONE)
  66
  67     // old style border flags
  68     wxFLAGS_MEMBER(wxSIMPLE_BORDER)
  69     wxFLAGS_MEMBER(wxSUNKEN_BORDER)
  70     wxFLAGS_MEMBER(wxDOUBLE_BORDER)
  71     wxFLAGS_MEMBER(wxRAISED_BORDER)
  72     wxFLAGS_MEMBER(wxSTATIC_BORDER)
  73     wxFLAGS_MEMBER(wxBORDER)
  74
  75     // standard window styles
  76     wxFLAGS_MEMBER(wxTAB_TRAVERSAL)
  77     wxFLAGS_MEMBER(wxCLIP_CHILDREN)
  78     wxFLAGS_MEMBER(wxTRANSPARENT_WINDOW)
  79     wxFLAGS_MEMBER(wxWANTS_CHARS)
  80     wxFLAGS_MEMBER(wxFULL_REPAINT_ON_RESIZE)
  81     wxFLAGS_MEMBER(wxALWAYS_SHOW_SB )
  82     wxFLAGS_MEMBER(wxVSCROLL)
  83     wxFLAGS_MEMBER(wxHSCROLL)
  84
  85     wxFLAGS_MEMBER(wxCB_SIMPLE)
  86     wxFLAGS_MEMBER(wxCB_SORT)
  87     wxFLAGS_MEMBER(wxCB_READONLY)
  88     wxFLAGS_MEMBER(wxCB_DROPDOWN)
  89
  90 wxEND_FLAGS( wxComboBoxStyle )
  91
  92 IMPLEMENT_DYNAMIC_CLASS_XTI(wxComboBox, wxControl,"wx/combobox.h")
  93
  94 wxBEGIN_PROPERTIES_TABLE(wxComboBox)
  95     wxEVENT_PROPERTY( Select , wxEVT_COMMAND_COMBOBOX_SELECTED , wxCommandEvent )
  96     wxEVENT_PROPERTY( TextEnter , wxEVT_COMMAND_TEXT_ENTER , wxCommandEvent )
  97
  98     // TODO DELEGATES
  99     wxPROPERTY( Font , wxFont , SetFont , GetFont  , EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
 100     wxPROPERTY_COLLECTION( Choices , wxArrayString , wxString , AppendString , GetStrings , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
 101     wxPROPERTY( Value ,wxString, SetValue, GetValue, EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
 102     wxPROPERTY( Selection ,int, SetSelection, GetSelection, EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
 103     wxPROPERTY_FLAGS( WindowStyle , wxComboBoxStyle , long , SetWindowStyleFlag , GetWindowStyleFlag , EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group")) // style
 104 wxEND_PROPERTIES_TABLE()
 105
 106 wxBEGIN_HANDLERS_TABLE(wxComboBox)
 107 wxEND_HANDLERS_TABLE()
 108
 109 wxCONSTRUCTOR_5( wxComboBox , wxWindow* , Parent , wxWindowID , Id , wxString , Value , wxPoint , Position , wxSize , Size )
 110
 111 #else
 112
 113 IMPLEMENT_DYNAMIC_CLASS(wxComboBox, wxControl)
 114
 115 #endif
 116
 117 BEGIN_EVENT_TABLE(wxComboBox, wxControl)
 118     EVT_MENU(wxID_CUT, wxComboBox::OnCut)
 119     EVT_MENU(wxID_COPY, wxComboBox::OnCopy)
 120     EVT_MENU(wxID_PASTE, wxComboBox::OnPaste)
 121     EVT_MENU(wxID_UNDO, wxComboBox::OnUndo)
 122     EVT_MENU(wxID_REDO, wxComboBox::OnRedo)
 123     EVT_MENU(wxID_CLEAR, wxComboBox::OnDelete)
 124     EVT_MENU(wxID_SELECTALL, wxComboBox::OnSelectAll)
 125
 126     EVT_UPDATE_UI(wxID_CUT, wxComboBox::OnUpdateCut)
 127     EVT_UPDATE_UI(wxID_COPY, wxComboBox::OnUpdateCopy)
 128     EVT_UPDATE_UI(wxID_PASTE, wxComboBox::OnUpdatePaste)
 129     EVT_UPDATE_UI(wxID_UNDO, wxComboBox::OnUpdateUndo)
 130     EVT_UPDATE_UI(wxID_REDO, wxComboBox::OnUpdateRedo)
 131     EVT_UPDATE_UI(wxID_CLEAR, wxComboBox::OnUpdateDelete)
 132     EVT_UPDATE_UI(wxID_SELECTALL, wxComboBox::OnUpdateSelectAll)
 133 END_EVENT_TABLE()
 134
 135 // ----------------------------------------------------------------------------
 136 // function prototypes
 137 // ----------------------------------------------------------------------------
 138
 139 LRESULT APIENTRY _EXPORT wxComboEditWndProc(HWND hWnd,
 140                                             UINT message,
 141                                             WPARAM wParam,
 142                                             LPARAM lParam);
 143
 144 // ---------------------------------------------------------------------------
 145 // global vars
 146 // ---------------------------------------------------------------------------
 147
 148 // the pointer to standard radio button wnd proc
 149 static WNDPROC gs_wndprocEdit = (WNDPROC)NULL;
 150
 151 // ============================================================================
 152 // implementation
 153 // ============================================================================
 154
 155 // ----------------------------------------------------------------------------
 156 // wnd proc for subclassed edit control
 157 // ----------------------------------------------------------------------------
 158
 159 LRESULT APIENTRY _EXPORT wxComboEditWndProc(HWND hWnd,
 160                                             UINT message,
 161                                             WPARAM wParam,
 162                                             LPARAM lParam)
 163 {
 164     HWND hwndCombo = ::GetParent(hWnd);
 165     wxWindow *win = wxFindWinFromHandle((WXHWND)hwndCombo);
 166
 167     switch ( message )
 168     {
 169         // forward some messages to the combobox to generate the appropriate
 170         // wxEvents from them
 171         case WM_KEYUP:
 172         case WM_KEYDOWN:
 173         case WM_CHAR:
 174         case WM_SYSCHAR:
 175         case WM_SYSKEYDOWN:
 176         case WM_SYSKEYUP:
 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() & wxTE_PROCESS_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
 212     return ::CallWindowProc(CASTWNDPROC gs_wndprocEdit, hWnd, message, wParam, lParam);
 213 }
 214
 215 // ----------------------------------------------------------------------------
 216 // wxComboBox callbacks
 217 // ----------------------------------------------------------------------------
 218
 219 WXLRESULT wxComboBox::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam)
 220 {
 221     // TODO: handle WM_CTLCOLOR messages from our EDIT control to be able to
 222     //       set its colour correctly (to be the same as our own one)
 223
 224     switch ( nMsg )
 225     {
 226         case WM_SIZE:
 227         // wxStaticBox can generate this message, when modifying the control's style.
 228         // This causes the content of the combobox to be selected, for some reason.
 229         case WM_STYLECHANGED:
 230             {
 231                 // combobox selection sometimes spontaneously changes when its
 232                 // size changes, restore it to the old value if necessary
 233                 long fromOld, toOld;
 234                 GetSelection(&fromOld, &toOld);
 235                 WXLRESULT result = wxChoice::MSWWindowProc(nMsg, wParam, lParam);
 236
 237                 long fromNew, toNew;
 238                 GetSelection(&fromNew, &toNew);
 239
 240                 if ( fromOld != fromNew || toOld != toNew )
 241                 {
 242                     SetSelection(fromOld, toOld);
 243                 }
 244
 245                 return result;
 246             }
 247     }
 248
 249     return wxChoice::MSWWindowProc(nMsg, wParam, lParam);
 250 }
 251
 252 bool wxComboBox::MSWProcessEditMsg(WXUINT msg, WXWPARAM wParam, WXLPARAM lParam)
 253 {
 254     switch ( msg )
 255     {
 256         case WM_CHAR:
 257             // for compatibility with wxTextCtrl, generate a special message
 258             // when Enter is pressed
 259             if ( wParam == VK_RETURN )
 260             {
 261                 wxCommandEvent event(wxEVT_COMMAND_TEXT_ENTER, m_windowId);
 262
 263                 const int sel = GetSelection();
 264                 event.SetInt(sel);
 265                 event.SetString(GetValue());
 266                 InitCommandEventWithItems(event, sel);
 267
 268                 if ( ProcessCommand(event) )
 269                 {
 270                     // don't let the event through to the native control
 271                     // because it doesn't need it and may generate an annoying
 272                     // beep if it gets it
 273                     return true;
 274                 }
 275             }
 276             // fall through
 277
 278         case WM_SYSCHAR:
 279             return HandleChar(wParam, lParam, true /* isASCII */);
 280
 281         case WM_SYSKEYDOWN:
 282         case WM_KEYDOWN:
 283             return HandleKeyDown(wParam, lParam);
 284
 285         case WM_SYSKEYUP:
 286         case WM_KEYUP:
 287             return HandleKeyUp(wParam, lParam);
 288
 289         case WM_SETFOCUS:
 290             return HandleSetFocus((WXHWND)wParam);
 291
 292         case WM_KILLFOCUS:
 293             return HandleKillFocus((WXHWND)wParam);
 294     }
 295
 296     return false;
 297 }
 298
 299 bool wxComboBox::MSWCommand(WXUINT param, WXWORD id)
 300 {
 301     int sel = -1;
 302     wxString value;
 303
 304     switch ( param )
 305     {
 306         case CBN_SELENDOK:
 307 #ifndef __SMARTPHONE__
 308             // we need to reset this to prevent the selection from being undone
 309             // by wxChoice, see wxChoice::MSWCommand() and comments there
 310             m_lastAcceptedSelection = wxID_NONE;
 311 #endif
 312
 313             // set these variables so that they could be also fixed in
 314             // CBN_EDITCHANGE below
 315             sel = GetSelection();
 316             value = GetStringSelection();
 317             {
 318                 wxCommandEvent event(wxEVT_COMMAND_COMBOBOX_SELECTED, GetId());
 319                 event.SetInt(sel);
 320                 event.SetString(value);
 321                 InitCommandEventWithItems(event, sel);
 322
 323                 ProcessCommand(event);
 324             }
 325
 326             // fall through: for compability with wxGTK, also send the text
 327             // update event when the selection changes (this also seems more
 328             // logical as the text does change)
 329
 330         case CBN_EDITCHANGE:
 331             {
 332                 wxCommandEvent event(wxEVT_COMMAND_TEXT_UPDATED, GetId());
 333
 334                 // if sel != -1, value was already initialized above
 335                 if ( sel == -1 )
 336                 {
 337                     value = wxGetWindowText(GetHwnd());
 338                 }
 339
 340                 event.SetString(value);
 341                 InitCommandEventWithItems(event, sel);
 342
 343                 ProcessCommand(event);
 344             }
 345             break;
 346
 347         default:
 348             return wxChoice::MSWCommand(param, id);
 349     }
 350
 351     // skip wxChoice version as it would generate its own events for
 352     // CBN_SELENDOK
 353     return wxControl::MSWCommand(param, id);
 354 }
 355
 356 WXHWND wxComboBox::GetEditHWND() const
 357 {
 358     // this function should not be called for wxCB_READONLY controls, it is
 359     // the callers responsability to check this
 360     wxASSERT_MSG( !(GetWindowStyle() & wxCB_READONLY),
 361                   _T("read-only combobox doesn't have any edit control") );
 362
 363     POINT pt;
 364     pt.x = pt.y = 4;
 365     HWND hwndEdit = ::ChildWindowFromPoint(GetHwnd(), pt);
 366     if ( !hwndEdit || hwndEdit == GetHwnd() )
 367     {
 368         wxFAIL_MSG(_T("not read only combobox without edit control?"));
 369     }
 370
 371     return (WXHWND)hwndEdit;
 372 }
 373
 374 // ----------------------------------------------------------------------------
 375 // wxComboBox creation
 376 // ----------------------------------------------------------------------------
 377
 378 bool wxComboBox::Create(wxWindow *parent, wxWindowID id,
 379                         const wxString& value,
 380                         const wxPoint& pos,
 381                         const wxSize& size,
 382                         int n, const wxString choices[],
 383                         long style,
 384                         const wxValidator& validator,
 385                         const wxString& name)
 386 {
 387     // pretend that wxComboBox is hidden while it is positioned and resized and
 388     // show it only right before leaving this method because otherwise there is
 389     // some noticeable flicker while the control rearranges itself
 390     m_isShown = false;
 391
 392     if ( !CreateAndInit(parent, id, pos, size, n, choices, style,
 393                         validator, name) )
 394         return false;
 395
 396     // we shouldn't call SetValue() for an empty string because this would
 397     // (correctly) result in an assert with a read only combobox and is useless
 398     // for the other ones anyhow
 399     if ( !value.empty() )
 400         SetValue(value);
 401
 402     // a (not read only) combobox is, in fact, 2 controls: the combobox itself
 403     // and an edit control inside it and if we want to catch events from this
 404     // edit control, we must subclass it as well
 405     if ( !(style & wxCB_READONLY) )
 406     {
 407         gs_wndprocEdit = wxSetWindowProc((HWND)GetEditHWND(),
 408                                          wxComboEditWndProc);
 409     }
 410
 411     // and finally, show the control
 412     Show(true);
 413
 414     return true;
 415 }
 416
 417 bool wxComboBox::Create(wxWindow *parent, wxWindowID id,
 418                         const wxString& value,
 419                         const wxPoint& pos,
 420                         const wxSize& size,
 421                         const wxArrayString& choices,
 422                         long style,
 423                         const wxValidator& validator,
 424                         const wxString& name)
 425 {
 426     wxCArrayString chs(choices);
 427     return Create(parent, id, value, pos, size, chs.GetCount(),
 428                   chs.GetStrings(), style, validator, name);
 429 }
 430
 431 WXDWORD wxComboBox::MSWGetStyle(long style, WXDWORD *exstyle) const
 432 {
 433     // we never have an external border
 434     WXDWORD msStyle = wxChoice::MSWGetStyle
 435                       (
 436                         (style & ~wxBORDER_MASK) | wxBORDER_NONE, exstyle
 437                       );
 438
 439     // usually WS_TABSTOP is added by wxControl::MSWGetStyle() but as we're
 440     // created hidden (see Create() above), it is not done for us but we still
 441     // want to have this style
 442     msStyle |= WS_TABSTOP;
 443
 444     // remove the style always added by wxChoice
 445     msStyle &= ~CBS_DROPDOWNLIST;
 446
 447     if ( style & wxCB_READONLY )
 448         msStyle |= CBS_DROPDOWNLIST;
 449 #ifndef __WXWINCE__
 450     else if ( style & wxCB_SIMPLE )
 451         msStyle |= CBS_SIMPLE; // A list (shown always) and edit control
 452 #endif
 453     else
 454         msStyle |= CBS_DROPDOWN;
 455
 456     // there is no reason to not always use CBS_AUTOHSCROLL, so do use it
 457     msStyle |= CBS_AUTOHSCROLL;
 458
 459     // NB: we used to also add CBS_NOINTEGRALHEIGHT here but why?
 460
 461     return msStyle;
 462 }
 463
 464 // ----------------------------------------------------------------------------
 465 // wxComboBox text control-like methods
 466 // ----------------------------------------------------------------------------
 467
 468 wxString wxComboBox::GetValue() const
 469 {
 470     return wxGetWindowText(m_hWnd);
 471 }
 472
 473 void wxComboBox::SetValue(const wxString& value)
 474 {
 475     if ( HasFlag(wxCB_READONLY) )
 476         SetStringSelection(value);
 477     else
 478         SetWindowText(GetHwnd(), value.c_str());
 479 }
 480
 481 // Clipboard operations
 482 void wxComboBox::Copy()
 483 {
 484     SendMessage(GetHwnd(), WM_COPY, 0, 0L);
 485 }
 486
 487 void wxComboBox::Cut()
 488 {
 489     SendMessage(GetHwnd(), WM_CUT, 0, 0L);
 490 }
 491
 492 void wxComboBox::Paste()
 493 {
 494     SendMessage(GetHwnd(), WM_PASTE, 0, 0L);
 495 }
 496
 497 void wxComboBox::Undo()
 498 {
 499     if (CanUndo())
 500     {
 501         HWND hEditWnd = (HWND) GetEditHWND();
 502         if ( hEditWnd )
 503             ::SendMessage(hEditWnd, EM_UNDO, 0, 0);
 504     }
 505 }
 506
 507 void wxComboBox::Redo()
 508 {
 509     if (CanUndo())
 510     {
 511         // Same as Undo, since Undo undoes the undo, i.e. a redo.
 512         HWND hEditWnd = (HWND) GetEditHWND();
 513         if ( hEditWnd )
 514             ::SendMessage(hEditWnd, EM_UNDO, 0, 0);
 515     }
 516 }
 517
 518 void wxComboBox::SelectAll()
 519 {
 520     SetSelection(0, GetLastPosition());
 521 }
 522
 523 bool wxComboBox::CanUndo() const
 524 {
 525     if (!IsEditable())
 526         return false;
 527
 528     HWND hEditWnd = (HWND) GetEditHWND();
 529     if ( hEditWnd )
 530         return ::SendMessage(hEditWnd, EM_CANUNDO, 0, 0) != 0;
 531     else
 532         return false;
 533 }
 534
 535 bool wxComboBox::CanRedo() const
 536 {
 537     if (!IsEditable())
 538         return false;
 539
 540     HWND hEditWnd = (HWND) GetEditHWND();
 541     if ( hEditWnd )
 542         return ::SendMessage(hEditWnd, EM_CANUNDO, 0, 0) != 0;
 543     else
 544         return false;
 545 }
 546
 547 bool wxComboBox::HasSelection() const
 548 {
 549     long from, to;
 550     GetSelection(&from, &to);
 551     return from != to;
 552 }
 553
 554 bool wxComboBox::CanCopy() const
 555 {
 556     // Can copy if there's a selection
 557     return HasSelection();
 558 }
 559
 560 bool wxComboBox::CanCut() const
 561 {
 562     return IsEditable() && CanCopy();
 563 }
 564
 565 bool wxComboBox::CanPaste() const
 566 {
 567     if ( !IsEditable() )
 568         return false;
 569
 570     // Standard edit control: check for straight text on clipboard
 571     if ( !::OpenClipboard(GetHwndOf(wxTheApp->GetTopWindow())) )
 572         return false;
 573
 574     bool isTextAvailable = ::IsClipboardFormatAvailable(CF_TEXT) != 0;
 575     ::CloseClipboard();
 576
 577     return isTextAvailable;
 578 }
 579
 580 bool wxComboBox::IsEditable() const
 581 {
 582     return !HasFlag(wxCB_READONLY);
 583 }
 584
 585 void wxComboBox::SetEditable(bool WXUNUSED(editable))
 586 {
 587   // Can't implement in MSW?
 588 //  HWND hWnd = GetHwnd();
 589 //  SendMessage(hWnd, EM_SETREADONLY, (WPARAM)!editable, (LPARAM)0L);
 590 }
 591
 592 void wxComboBox::SetInsertionPoint(long pos)
 593 {
 594     if ( GetWindowStyle() & wxCB_READONLY )
 595         return;
 596
 597 #ifdef __WIN32__
 598     HWND hWnd = GetHwnd();
 599     ::SendMessage(hWnd, CB_SETEDITSEL, 0, MAKELPARAM(pos, pos));
 600     HWND hEditWnd = (HWND) GetEditHWND();
 601     if ( hEditWnd )
 602     {
 603         // Scroll insertion point into view
 604         SendMessage(hEditWnd, EM_SCROLLCARET, (WPARAM)0, (LPARAM)0);
 605         // Why is this necessary? (Copied from wxTextCtrl::SetInsertionPoint)
 606         SendMessage(hEditWnd, EM_REPLACESEL, 0, (LPARAM) wxEmptyString);
 607     }
 608 #endif // __WIN32__
 609 }
 610
 611 void wxComboBox::SetInsertionPointEnd()
 612 {
 613     // setting insertion point doesn't make sense for read only comboboxes
 614     if ( !(GetWindowStyle() & wxCB_READONLY) )
 615     {
 616         wxTextPos pos = GetLastPosition();
 617         SetInsertionPoint(pos);
 618     }
 619 }
 620
 621 long wxComboBox::GetInsertionPoint() const
 622 {
 623     // CB_GETEDITSEL returns the index of the first character of the selection in
 624     // its low-order word
 625     DWORD pos= (DWORD)::SendMessage(GetHwnd(), CB_GETEDITSEL, 0, 0L);
 626     return LOWORD(pos);
 627 }
 628
 629 wxTextPos wxComboBox::GetLastPosition() const
 630 {
 631     HWND hEditWnd = (HWND) GetEditHWND();
 632
 633     // Get number of characters in the last (only) line. We'll add this to the character
 634     // index for the last line, 1st position.
 635     wxTextPos lineLength = (wxTextPos)SendMessage(hEditWnd, EM_LINELENGTH, (WPARAM) 0, (LPARAM)0L);
 636
 637     return lineLength;
 638 }
 639
 640 void wxComboBox::Replace(long from, long to, const wxString& value)
 641 {
 642 #if wxUSE_CLIPBOARD
 643     Remove(from, to);
 644
 645     // Now replace with 'value', by pasting.
 646     wxSetClipboardData(wxDF_TEXT, (wxObject *)(const wxChar *)value, 0, 0);
 647
 648     // Paste into edit control
 649     SendMessage(GetHwnd(), WM_PASTE, (WPARAM)0, (LPARAM)0L);
 650 #else
 651     wxUnusedVar(from);
 652     wxUnusedVar(to);
 653     wxUnusedVar(value);
 654 #endif
 655 }
 656
 657 void wxComboBox::Remove(long from, long to)
 658 {
 659     // Set selection and remove it
 660     SetSelection(from, to);
 661     SendMessage(GetHwnd(), WM_CUT, (WPARAM)0, (LPARAM)0);
 662 }
 663
 664 void wxComboBox::SetSelection(long from, long to)
 665 {
 666     // if from and to are both -1, it means (in wxWidgets) that all text should
 667     // be selected, translate this into Windows convention
 668     if ( (from == -1) && (to == -1) )
 669     {
 670         from = 0;
 671     }
 672
 673     if ( SendMessage(GetHwnd(), CB_SETEDITSEL,
 674                      0, (LPARAM)MAKELONG(from, to)) == CB_ERR )
 675     {
 676         wxLogDebug(_T("CB_SETEDITSEL failed"));
 677     }
 678 }
 679
 680 void wxComboBox::GetSelection(long* from, long* to) const
 681 {
 682     DWORD dwStart, dwEnd;
 683     if ( ::SendMessage(GetHwnd(), CB_GETEDITSEL,
 684                        (WPARAM)&dwStart, (LPARAM)&dwEnd) == CB_ERR )
 685     {
 686         *from =
 687         *to = 0;
 688     }
 689     else
 690     {
 691         *from = dwStart;
 692         *to = dwEnd;
 693     }
 694 }
 695
 696 // ----------------------------------------------------------------------------
 697 // standard event handling
 698 // ----------------------------------------------------------------------------
 699
 700 void wxComboBox::OnCut(wxCommandEvent& WXUNUSED(event))
 701 {
 702     Cut();
 703 }
 704
 705 void wxComboBox::OnCopy(wxCommandEvent& WXUNUSED(event))
 706 {
 707     Copy();
 708 }
 709
 710 void wxComboBox::OnPaste(wxCommandEvent& WXUNUSED(event))
 711 {
 712     Paste();
 713 }
 714
 715 void wxComboBox::OnUndo(wxCommandEvent& WXUNUSED(event))
 716 {
 717     Undo();
 718 }
 719
 720 void wxComboBox::OnRedo(wxCommandEvent& WXUNUSED(event))
 721 {
 722     Redo();
 723 }
 724
 725 void wxComboBox::OnDelete(wxCommandEvent& WXUNUSED(event))
 726 {
 727     long from, to;
 728     GetSelection(& from, & to);
 729     if (from != -1 && to != -1)
 730         Remove(from, to);
 731 }
 732
 733 void wxComboBox::OnSelectAll(wxCommandEvent& WXUNUSED(event))
 734 {
 735     SetSelection(-1, -1);
 736 }
 737
 738 void wxComboBox::OnUpdateCut(wxUpdateUIEvent& event)
 739 {
 740     event.Enable( CanCut() );
 741 }
 742
 743 void wxComboBox::OnUpdateCopy(wxUpdateUIEvent& event)
 744 {
 745     event.Enable( CanCopy() );
 746 }
 747
 748 void wxComboBox::OnUpdatePaste(wxUpdateUIEvent& event)
 749 {
 750     event.Enable( CanPaste() );
 751 }
 752
 753 void wxComboBox::OnUpdateUndo(wxUpdateUIEvent& event)
 754 {
 755     event.Enable( CanUndo() );
 756 }
 757
 758 void wxComboBox::OnUpdateRedo(wxUpdateUIEvent& event)
 759 {
 760     event.Enable( CanRedo() );
 761 }
 762
 763 void wxComboBox::OnUpdateDelete(wxUpdateUIEvent& event)
 764 {
 765     event.Enable(HasSelection() && IsEditable());
 766 }
 767
 768 void wxComboBox::OnUpdateSelectAll(wxUpdateUIEvent& event)
 769 {
 770     event.Enable(GetLastPosition() > 0);
 771 }
 772
 773 #endif // wxUSE_COMBOBOX