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/msw/wrapcctl.h" // include <commctrl.h> "properly"
  33     #include "wx/settings.h"
  34     #include "wx/log.h"
  35     // for wxEVT_COMMAND_TEXT_ENTER
  36     #include "wx/textctrl.h"
  37     #include "wx/app.h"
  38     #include "wx/brush.h"
  39 #endif
  40
  41 #include "wx/clipbrd.h"
  42 #include "wx/msw/private.h"
  43
  44 #if wxUSE_TOOLTIPS
  45     #include "wx/tooltip.h"
  46 #endif // wxUSE_TOOLTIPS
  47
  48 // ----------------------------------------------------------------------------
  49 // wxWin macros
  50 // ----------------------------------------------------------------------------
  51
  52 #if wxUSE_EXTENDED_RTTI
  53 WX_DEFINE_FLAGS( wxComboBoxStyle )
  54
  55 wxBEGIN_FLAGS( wxComboBoxStyle )
  56     // new style border flags, we put them first to
  57     // use them for streaming out
  58     wxFLAGS_MEMBER(wxBORDER_SIMPLE)
  59     wxFLAGS_MEMBER(wxBORDER_SUNKEN)
  60     wxFLAGS_MEMBER(wxBORDER_DOUBLE)
  61     wxFLAGS_MEMBER(wxBORDER_RAISED)
  62     wxFLAGS_MEMBER(wxBORDER_STATIC)
  63     wxFLAGS_MEMBER(wxBORDER_NONE)
  64
  65     // old style border flags
  66     wxFLAGS_MEMBER(wxSIMPLE_BORDER)
  67     wxFLAGS_MEMBER(wxSUNKEN_BORDER)
  68     wxFLAGS_MEMBER(wxDOUBLE_BORDER)
  69     wxFLAGS_MEMBER(wxRAISED_BORDER)
  70     wxFLAGS_MEMBER(wxSTATIC_BORDER)
  71     wxFLAGS_MEMBER(wxBORDER)
  72
  73     // standard window styles
  74     wxFLAGS_MEMBER(wxTAB_TRAVERSAL)
  75     wxFLAGS_MEMBER(wxCLIP_CHILDREN)
  76     wxFLAGS_MEMBER(wxTRANSPARENT_WINDOW)
  77     wxFLAGS_MEMBER(wxWANTS_CHARS)
  78     wxFLAGS_MEMBER(wxFULL_REPAINT_ON_RESIZE)
  79     wxFLAGS_MEMBER(wxALWAYS_SHOW_SB )
  80     wxFLAGS_MEMBER(wxVSCROLL)
  81     wxFLAGS_MEMBER(wxHSCROLL)
  82
  83     wxFLAGS_MEMBER(wxCB_SIMPLE)
  84     wxFLAGS_MEMBER(wxCB_SORT)
  85     wxFLAGS_MEMBER(wxCB_READONLY)
  86     wxFLAGS_MEMBER(wxCB_DROPDOWN)
  87
  88 wxEND_FLAGS( wxComboBoxStyle )
  89
  90 IMPLEMENT_DYNAMIC_CLASS_XTI(wxComboBox, wxControl,"wx/combobox.h")
  91
  92 wxBEGIN_PROPERTIES_TABLE(wxComboBox)
  93     wxEVENT_PROPERTY( Select , wxEVT_COMMAND_COMBOBOX_SELECTED , wxCommandEvent )
  94     wxEVENT_PROPERTY( TextEnter , wxEVT_COMMAND_TEXT_ENTER , wxCommandEvent )
  95
  96     // TODO DELEGATES
  97     wxPROPERTY( Font , wxFont , SetFont , GetFont  , EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
  98     wxPROPERTY_COLLECTION( Choices , wxArrayString , wxString , AppendString , GetStrings , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
  99     wxPROPERTY( Value ,wxString, SetValue, GetValue, EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
 100     wxPROPERTY( Selection ,int, SetSelection, GetSelection, EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
 101     wxPROPERTY_FLAGS( WindowStyle , wxComboBoxStyle , long , SetWindowStyleFlag , GetWindowStyleFlag , EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group")) // style
 102 wxEND_PROPERTIES_TABLE()
 103
 104 wxBEGIN_HANDLERS_TABLE(wxComboBox)
 105 wxEND_HANDLERS_TABLE()
 106
 107 wxCONSTRUCTOR_5( wxComboBox , wxWindow* , Parent , wxWindowID , Id , wxString , Value , wxPoint , Position , wxSize , Size )
 108
 109 #else
 110
 111 IMPLEMENT_DYNAMIC_CLASS(wxComboBox, wxControl)
 112
 113 #endif
 114
 115 BEGIN_EVENT_TABLE(wxComboBox, wxControl)
 116     EVT_MENU(wxID_CUT, wxComboBox::OnCut)
 117     EVT_MENU(wxID_COPY, wxComboBox::OnCopy)
 118     EVT_MENU(wxID_PASTE, wxComboBox::OnPaste)
 119     EVT_MENU(wxID_UNDO, wxComboBox::OnUndo)
 120     EVT_MENU(wxID_REDO, wxComboBox::OnRedo)
 121     EVT_MENU(wxID_CLEAR, wxComboBox::OnDelete)
 122     EVT_MENU(wxID_SELECTALL, wxComboBox::OnSelectAll)
 123
 124     EVT_UPDATE_UI(wxID_CUT, wxComboBox::OnUpdateCut)
 125     EVT_UPDATE_UI(wxID_COPY, wxComboBox::OnUpdateCopy)
 126     EVT_UPDATE_UI(wxID_PASTE, wxComboBox::OnUpdatePaste)
 127     EVT_UPDATE_UI(wxID_UNDO, wxComboBox::OnUpdateUndo)
 128     EVT_UPDATE_UI(wxID_REDO, wxComboBox::OnUpdateRedo)
 129     EVT_UPDATE_UI(wxID_CLEAR, wxComboBox::OnUpdateDelete)
 130     EVT_UPDATE_UI(wxID_SELECTALL, wxComboBox::OnUpdateSelectAll)
 131 END_EVENT_TABLE()
 132
 133 // ----------------------------------------------------------------------------
 134 // function prototypes
 135 // ----------------------------------------------------------------------------
 136
 137 LRESULT APIENTRY _EXPORT wxComboEditWndProc(HWND hWnd,
 138                                             UINT message,
 139                                             WPARAM wParam,
 140                                             LPARAM lParam);
 141
 142 // ---------------------------------------------------------------------------
 143 // global vars
 144 // ---------------------------------------------------------------------------
 145
 146 // the pointer to standard radio button wnd proc
 147 static WNDPROC gs_wndprocEdit = (WNDPROC)NULL;
 148
 149 // ============================================================================
 150 // implementation
 151 // ============================================================================
 152
 153 // ----------------------------------------------------------------------------
 154 // wnd proc for subclassed edit control
 155 // ----------------------------------------------------------------------------
 156
 157 LRESULT APIENTRY _EXPORT wxComboEditWndProc(HWND hWnd,
 158                                             UINT message,
 159                                             WPARAM wParam,
 160                                             LPARAM lParam)
 161 {
 162     HWND hwndCombo = ::GetParent(hWnd);
 163     wxWindow *win = wxFindWinFromHandle((WXHWND)hwndCombo);
 164
 165     switch ( message )
 166     {
 167         // forward some messages to the combobox to generate the appropriate
 168         // wxEvents from them
 169         case WM_KEYUP:
 170         case WM_KEYDOWN:
 171         case WM_CHAR:
 172         case WM_SYSCHAR:
 173         case WM_SYSKEYDOWN:
 174         case WM_SYSKEYUP:
 175         case WM_SETFOCUS:
 176         case WM_KILLFOCUS:
 177             {
 178                 wxComboBox *combo = wxDynamicCast(win, wxComboBox);
 179                 if ( !combo )
 180                 {
 181                     // we can get WM_KILLFOCUS while our parent is already half
 182                     // destroyed and hence doesn't look like a combobx any
 183                     // longer, check for it to avoid bogus assert failures
 184                     if ( !win->IsBeingDeleted() )
 185                     {
 186                         wxFAIL_MSG( _T("should have combo as parent") );
 187                     }
 188                 }
 189                 else if ( combo->MSWProcessEditMsg(message, wParam, lParam) )
 190                 {
 191                     // handled by parent
 192                     return 0;
 193                 }
 194             }
 195             break;
 196
 197         case WM_GETDLGCODE:
 198             {
 199                 wxCHECK_MSG( win, 0, _T("should have a parent") );
 200
 201                 if ( win->GetWindowStyle() & wxTE_PROCESS_ENTER )
 202                 {
 203                     // need to return a custom dlg code or we'll never get it
 204                     return DLGC_WANTMESSAGE;
 205                 }
 206             }
 207             break;
 208
 209         case WM_CUT:
 210         case WM_COPY:
 211         case WM_PASTE:
 212             if( win->HandleClipboardEvent( message ) )
 213                 return 0;
 214             break;
 215     }
 216
 217     return ::CallWindowProc(CASTWNDPROC gs_wndprocEdit, hWnd, message, wParam, lParam);
 218 }
 219
 220 // ----------------------------------------------------------------------------
 221 // wxComboBox callbacks
 222 // ----------------------------------------------------------------------------
 223
 224 WXLRESULT wxComboBox::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam)
 225 {
 226     // TODO: handle WM_CTLCOLOR messages from our EDIT control to be able to
 227     //       set its colour correctly (to be the same as our own one)
 228
 229     switch ( nMsg )
 230     {
 231         case WM_SIZE:
 232         // wxStaticBox can generate this message, when modifying the control's style.
 233         // This causes the content of the combobox to be selected, for some reason.
 234         case WM_STYLECHANGED:
 235             {
 236                 // combobox selection sometimes spontaneously changes when its
 237                 // size changes, restore it to the old value if necessary
 238                 long fromOld, toOld;
 239                 GetSelection(&fromOld, &toOld);
 240                 WXLRESULT result = wxChoice::MSWWindowProc(nMsg, wParam, lParam);
 241
 242                 long fromNew, toNew;
 243                 GetSelection(&fromNew, &toNew);
 244
 245                 if ( fromOld != fromNew || toOld != toNew )
 246                 {
 247                     SetSelection(fromOld, toOld);
 248                 }
 249
 250                 return result;
 251             }
 252     }
 253
 254     return wxChoice::MSWWindowProc(nMsg, wParam, lParam);
 255 }
 256
 257 bool wxComboBox::MSWProcessEditMsg(WXUINT msg, WXWPARAM wParam, WXLPARAM lParam)
 258 {
 259     switch ( msg )
 260     {
 261         case WM_CHAR:
 262             // for compatibility with wxTextCtrl, generate a special message
 263             // when Enter is pressed
 264             if ( wParam == VK_RETURN )
 265             {
 266                 wxCommandEvent event(wxEVT_COMMAND_TEXT_ENTER, m_windowId);
 267
 268                 const int sel = GetSelection();
 269                 event.SetInt(sel);
 270                 event.SetString(GetValue());
 271                 InitCommandEventWithItems(event, sel);
 272
 273                 if ( ProcessCommand(event) )
 274                 {
 275                     // don't let the event through to the native control
 276                     // because it doesn't need it and may generate an annoying
 277                     // beep if it gets it
 278                     return true;
 279                 }
 280             }
 281             // fall through
 282
 283         case WM_SYSCHAR:
 284             return HandleChar(wParam, lParam, true /* isASCII */);
 285
 286         case WM_SYSKEYDOWN:
 287         case WM_KEYDOWN:
 288             return HandleKeyDown(wParam, lParam);
 289
 290         case WM_SYSKEYUP:
 291         case WM_KEYUP:
 292             return HandleKeyUp(wParam, lParam);
 293
 294         case WM_SETFOCUS:
 295             return HandleSetFocus((WXHWND)wParam);
 296
 297         case WM_KILLFOCUS:
 298             return HandleKillFocus((WXHWND)wParam);
 299     }
 300
 301     return false;
 302 }
 303
 304 bool wxComboBox::MSWCommand(WXUINT param, WXWORD id)
 305 {
 306     int sel = -1;
 307     wxString value;
 308
 309     switch ( param )
 310     {
 311         case CBN_SELENDOK:
 312 #ifndef __SMARTPHONE__
 313             // we need to reset this to prevent the selection from being undone
 314             // by wxChoice, see wxChoice::MSWCommand() and comments there
 315             m_lastAcceptedSelection = wxID_NONE;
 316 #endif
 317
 318             // set these variables so that they could be also fixed in
 319             // CBN_EDITCHANGE below
 320             sel = GetSelection();
 321             value = GetStringSelection();
 322
 323             // this string is going to become the new combobox value soon but
 324             // we need it to be done right now, otherwise the event handler
 325             // could get a wrong value when it calls our GetValue()
 326             ::SetWindowText(GetHwnd(), value);
 327
 328             {
 329                 wxCommandEvent event(wxEVT_COMMAND_COMBOBOX_SELECTED, GetId());
 330                 event.SetInt(sel);
 331                 event.SetString(value);
 332                 InitCommandEventWithItems(event, sel);
 333
 334                 ProcessCommand(event);
 335             }
 336
 337             // fall through: for compability with wxGTK, also send the text
 338             // update event when the selection changes (this also seems more
 339             // logical as the text does change)
 340
 341         case CBN_EDITCHANGE:
 342             {
 343                 wxCommandEvent event(wxEVT_COMMAND_TEXT_UPDATED, GetId());
 344
 345                 // if sel != -1, value was already initialized above
 346                 if ( sel == -1 )
 347                 {
 348                     value = wxGetWindowText(GetHwnd());
 349                 }
 350
 351                 event.SetString(value);
 352                 InitCommandEventWithItems(event, sel);
 353
 354                 ProcessCommand(event);
 355             }
 356             break;
 357
 358         default:
 359             return wxChoice::MSWCommand(param, id);
 360     }
 361
 362     // skip wxChoice version as it would generate its own events for
 363     // CBN_SELENDOK
 364     return wxControl::MSWCommand(param, id);
 365 }
 366
 367 WXHWND wxComboBox::GetEditHWND() const
 368 {
 369     // this function should not be called for wxCB_READONLY controls, it is
 370     // the callers responsability to check this
 371     wxASSERT_MSG( !(GetWindowStyle() & wxCB_READONLY),
 372                   _T("read-only combobox doesn't have any edit control") );
 373
 374     POINT pt;
 375     pt.x = pt.y = 4;
 376     HWND hwndEdit = ::ChildWindowFromPoint(GetHwnd(), pt);
 377     if ( !hwndEdit || hwndEdit == GetHwnd() )
 378     {
 379         wxFAIL_MSG(_T("not read only combobox without edit control?"));
 380     }
 381
 382     return (WXHWND)hwndEdit;
 383 }
 384
 385 // ----------------------------------------------------------------------------
 386 // wxComboBox creation
 387 // ----------------------------------------------------------------------------
 388
 389 bool wxComboBox::Create(wxWindow *parent, wxWindowID id,
 390                         const wxString& value,
 391                         const wxPoint& pos,
 392                         const wxSize& size,
 393                         int n, const wxString choices[],
 394                         long style,
 395                         const wxValidator& validator,
 396                         const wxString& name)
 397 {
 398     // pretend that wxComboBox is hidden while it is positioned and resized and
 399     // show it only right before leaving this method because otherwise there is
 400     // some noticeable flicker while the control rearranges itself
 401     m_isShown = false;
 402
 403     if ( !CreateAndInit(parent, id, pos, size, n, choices, style,
 404                         validator, name) )
 405         return false;
 406
 407     // we shouldn't call SetValue() for an empty string because this would
 408     // (correctly) result in an assert with a read only combobox and is useless
 409     // for the other ones anyhow
 410     if ( !value.empty() )
 411         SetValue(value);
 412
 413     // a (not read only) combobox is, in fact, 2 controls: the combobox itself
 414     // and an edit control inside it and if we want to catch events from this
 415     // edit control, we must subclass it as well
 416     if ( !(style & wxCB_READONLY) )
 417     {
 418         gs_wndprocEdit = wxSetWindowProc((HWND)GetEditHWND(), wxComboEditWndProc);
 419     }
 420
 421     // and finally, show the control
 422     Show(true);
 423
 424     return true;
 425 }
 426
 427 bool wxComboBox::Create(wxWindow *parent, wxWindowID id,
 428                         const wxString& value,
 429                         const wxPoint& pos,
 430                         const wxSize& size,
 431                         const wxArrayString& choices,
 432                         long style,
 433                         const wxValidator& validator,
 434                         const wxString& name)
 435 {
 436     wxCArrayString chs(choices);
 437     return Create(parent, id, value, pos, size, chs.GetCount(),
 438                   chs.GetStrings(), style, validator, name);
 439 }
 440
 441 WXDWORD wxComboBox::MSWGetStyle(long style, WXDWORD *exstyle) const
 442 {
 443     // we never have an external border
 444     WXDWORD msStyle = wxChoice::MSWGetStyle
 445                       (
 446                         (style & ~wxBORDER_MASK) | wxBORDER_NONE, exstyle
 447                       );
 448
 449     // usually WS_TABSTOP is added by wxControl::MSWGetStyle() but as we're
 450     // created hidden (see Create() above), it is not done for us but we still
 451     // want to have this style
 452     msStyle |= WS_TABSTOP;
 453
 454     // remove the style always added by wxChoice
 455     msStyle &= ~CBS_DROPDOWNLIST;
 456
 457     if ( style & wxCB_READONLY )
 458         msStyle |= CBS_DROPDOWNLIST;
 459 #ifndef __WXWINCE__
 460     else if ( style & wxCB_SIMPLE )
 461         msStyle |= CBS_SIMPLE; // A list (shown always) and edit control
 462 #endif
 463     else
 464         msStyle |= CBS_DROPDOWN;
 465
 466     // there is no reason to not always use CBS_AUTOHSCROLL, so do use it
 467     msStyle |= CBS_AUTOHSCROLL;
 468
 469     // NB: we used to also add CBS_NOINTEGRALHEIGHT here but why?
 470
 471     return msStyle;
 472 }
 473
 474 // ----------------------------------------------------------------------------
 475 // wxComboBox text control-like methods
 476 // ----------------------------------------------------------------------------
 477
 478 wxString wxComboBox::GetValue() const
 479 {
 480     return wxGetWindowText(m_hWnd);
 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
 491 // Clipboard operations
 492 void wxComboBox::Copy()
 493 {
 494     SendMessage(GetHwnd(), WM_COPY, 0, 0L);
 495 }
 496
 497 void wxComboBox::Cut()
 498 {
 499     SendMessage(GetHwnd(), WM_CUT, 0, 0L);
 500 }
 501
 502 void wxComboBox::Paste()
 503 {
 504     SendMessage(GetHwnd(), WM_PASTE, 0, 0L);
 505 }
 506
 507 void wxComboBox::Undo()
 508 {
 509     if (CanUndo())
 510     {
 511         HWND hEditWnd = (HWND) GetEditHWND();
 512         if ( hEditWnd )
 513             ::SendMessage(hEditWnd, EM_UNDO, 0, 0);
 514     }
 515 }
 516
 517 void wxComboBox::Redo()
 518 {
 519     if (CanUndo())
 520     {
 521         // Same as Undo, since Undo undoes the undo, i.e. a redo.
 522         HWND hEditWnd = (HWND) GetEditHWND();
 523         if ( hEditWnd )
 524             ::SendMessage(hEditWnd, EM_UNDO, 0, 0);
 525     }
 526 }
 527
 528 void wxComboBox::SelectAll()
 529 {
 530     SetSelection(0, GetLastPosition());
 531 }
 532
 533 bool wxComboBox::CanUndo() const
 534 {
 535     if (!IsEditable())
 536         return false;
 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     if (!IsEditable())
 548         return false;
 549
 550     HWND hEditWnd = (HWND) GetEditHWND();
 551     if ( hEditWnd )
 552         return ::SendMessage(hEditWnd, EM_CANUNDO, 0, 0) != 0;
 553     else
 554         return false;
 555 }
 556
 557 bool wxComboBox::HasSelection() const
 558 {
 559     long from, to;
 560     GetSelection(&from, &to);
 561     return from != to;
 562 }
 563
 564 bool wxComboBox::CanCopy() const
 565 {
 566     // Can copy if there's a selection
 567     return HasSelection();
 568 }
 569
 570 bool wxComboBox::CanCut() const
 571 {
 572     return IsEditable() && CanCopy();
 573 }
 574
 575 bool wxComboBox::CanPaste() const
 576 {
 577     if ( !IsEditable() )
 578         return false;
 579
 580     // Standard edit control: check for straight text on clipboard
 581     if ( !::OpenClipboard(GetHwndOf(wxTheApp->GetTopWindow())) )
 582         return false;
 583
 584     bool isTextAvailable = ::IsClipboardFormatAvailable(CF_TEXT) != 0;
 585     ::CloseClipboard();
 586
 587     return isTextAvailable;
 588 }
 589
 590 bool wxComboBox::IsEditable() const
 591 {
 592     return !HasFlag(wxCB_READONLY);
 593 }
 594
 595 void wxComboBox::SetEditable(bool editable)
 596 {
 597     HWND hWnd = (HWND)GetEditHWND();
 598     if ( !::SendMessage(hWnd, EM_SETREADONLY, !editable, 0) )
 599     {
 600         wxLogLastError(_T("SendMessage(EM_SETREADONLY)"));
 601     }
 602 }
 603
 604 void wxComboBox::SetInsertionPoint(long pos)
 605 {
 606     if ( GetWindowStyle() & wxCB_READONLY )
 607         return;
 608
 609     HWND hWnd = GetHwnd();
 610     ::SendMessage(hWnd, CB_SETEDITSEL, 0, MAKELPARAM(pos, pos));
 611     HWND hEditWnd = (HWND) GetEditHWND();
 612     if ( hEditWnd )
 613     {
 614         // Scroll insertion point into view
 615         SendMessage(hEditWnd, EM_SCROLLCARET, (WPARAM)0, (LPARAM)0);
 616         // Why is this necessary? (Copied from wxTextCtrl::SetInsertionPoint)
 617         SendMessage(hEditWnd, EM_REPLACESEL, 0, (LPARAM) wxEmptyString);
 618     }
 619 }
 620
 621 void wxComboBox::SetInsertionPointEnd()
 622 {
 623     // setting insertion point doesn't make sense for read only comboboxes
 624     if ( !(GetWindowStyle() & wxCB_READONLY) )
 625     {
 626         wxTextPos pos = GetLastPosition();
 627         SetInsertionPoint(pos);
 628     }
 629 }
 630
 631 long wxComboBox::GetInsertionPoint() const
 632 {
 633     // CB_GETEDITSEL returns the index of the first character of the selection in
 634     // its low-order word
 635     DWORD pos= (DWORD)::SendMessage(GetHwnd(), CB_GETEDITSEL, 0, 0L);
 636     return LOWORD(pos);
 637 }
 638
 639 wxTextPos wxComboBox::GetLastPosition() const
 640 {
 641     HWND hEditWnd = (HWND) GetEditHWND();
 642
 643     // Get number of characters in the last (only) line. We'll add this to the character
 644     // index for the last line, 1st position.
 645     wxTextPos lineLength = (wxTextPos)SendMessage(hEditWnd, EM_LINELENGTH, (WPARAM) 0, (LPARAM)0L);
 646
 647     return lineLength;
 648 }
 649
 650 void wxComboBox::Replace(long from, long to, const wxString& value)
 651 {
 652 #if wxUSE_CLIPBOARD
 653     Remove(from, to);
 654
 655     // Now replace with 'value', by pasting.
 656     wxSetClipboardData(wxDF_TEXT, (wxObject *)(const wxChar *)value, 0, 0);
 657
 658     // Paste into edit control
 659     SendMessage(GetHwnd(), WM_PASTE, (WPARAM)0, (LPARAM)0L);
 660 #else
 661     wxUnusedVar(from);
 662     wxUnusedVar(to);
 663     wxUnusedVar(value);
 664 #endif
 665 }
 666
 667 void wxComboBox::Remove(long from, long to)
 668 {
 669     // Set selection and remove it
 670     SetSelection(from, to);
 671     SendMessage(GetHwnd(), WM_CUT, (WPARAM)0, (LPARAM)0);
 672 }
 673
 674 void wxComboBox::SetSelection(long from, long to)
 675 {
 676     // if from and to are both -1, it means (in wxWidgets) that all text should
 677     // be selected, translate this into Windows convention
 678     if ( (from == -1) && (to == -1) )
 679     {
 680         from = 0;
 681     }
 682
 683     if ( SendMessage(GetHwnd(), CB_SETEDITSEL,
 684                      0, (LPARAM)MAKELONG(from, to)) == CB_ERR )
 685     {
 686         wxLogDebug(_T("CB_SETEDITSEL failed"));
 687     }
 688 }
 689
 690 void wxComboBox::GetSelection(long* from, long* to) const
 691 {
 692     DWORD dwStart, dwEnd;
 693     if ( ::SendMessage(GetHwnd(), CB_GETEDITSEL,
 694                        (WPARAM)&dwStart, (LPARAM)&dwEnd) == CB_ERR )
 695     {
 696         *from =
 697         *to = 0;
 698     }
 699     else
 700     {
 701         *from = dwStart;
 702         *to = dwEnd;
 703     }
 704 }
 705
 706 // ----------------------------------------------------------------------------
 707 // standard event handling
 708 // ----------------------------------------------------------------------------
 709
 710 void wxComboBox::OnCut(wxCommandEvent& WXUNUSED(event))
 711 {
 712     Cut();
 713 }
 714
 715 void wxComboBox::OnCopy(wxCommandEvent& WXUNUSED(event))
 716 {
 717     Copy();
 718 }
 719
 720 void wxComboBox::OnPaste(wxCommandEvent& WXUNUSED(event))
 721 {
 722     Paste();
 723 }
 724
 725 void wxComboBox::OnUndo(wxCommandEvent& WXUNUSED(event))
 726 {
 727     Undo();
 728 }
 729
 730 void wxComboBox::OnRedo(wxCommandEvent& WXUNUSED(event))
 731 {
 732     Redo();
 733 }
 734
 735 void wxComboBox::OnDelete(wxCommandEvent& WXUNUSED(event))
 736 {
 737     long from, to;
 738     GetSelection(& from, & to);
 739     if (from != -1 && to != -1)
 740         Remove(from, to);
 741 }
 742
 743 void wxComboBox::OnSelectAll(wxCommandEvent& WXUNUSED(event))
 744 {
 745     SetSelection(-1, -1);
 746 }
 747
 748 void wxComboBox::OnUpdateCut(wxUpdateUIEvent& event)
 749 {
 750     event.Enable( CanCut() );
 751 }
 752
 753 void wxComboBox::OnUpdateCopy(wxUpdateUIEvent& event)
 754 {
 755     event.Enable( CanCopy() );
 756 }
 757
 758 void wxComboBox::OnUpdatePaste(wxUpdateUIEvent& event)
 759 {
 760     event.Enable( CanPaste() );
 761 }
 762
 763 void wxComboBox::OnUpdateUndo(wxUpdateUIEvent& event)
 764 {
 765     event.Enable( CanUndo() );
 766 }
 767
 768 void wxComboBox::OnUpdateRedo(wxUpdateUIEvent& event)
 769 {
 770     event.Enable( CanRedo() );
 771 }
 772
 773 void wxComboBox::OnUpdateDelete(wxUpdateUIEvent& event)
 774 {
 775     event.Enable(HasSelection() && IsEditable());
 776 }
 777
 778 void wxComboBox::OnUpdateSelectAll(wxUpdateUIEvent& event)
 779 {
 780     event.Enable(GetLastPosition() > 0);
 781 }
 782
 783 #endif // wxUSE_COMBOBOX