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/wupdlock.h"
  43 #include "wx/msw/private.h"
  44
  45 #if wxUSE_TOOLTIPS
  46     #include "wx/tooltip.h"
  47 #endif // wxUSE_TOOLTIPS
  48
  49 // ----------------------------------------------------------------------------
  50 // wxWin macros
  51 // ----------------------------------------------------------------------------
  52
  53 #if wxUSE_EXTENDED_RTTI
  54 WX_DEFINE_FLAGS( wxComboBoxStyle )
  55
  56 wxBEGIN_FLAGS( wxComboBoxStyle )
  57     // new style border flags, we put them first to
  58     // use them for streaming out
  59     wxFLAGS_MEMBER(wxBORDER_SIMPLE)
  60     wxFLAGS_MEMBER(wxBORDER_SUNKEN)
  61     wxFLAGS_MEMBER(wxBORDER_DOUBLE)
  62     wxFLAGS_MEMBER(wxBORDER_RAISED)
  63     wxFLAGS_MEMBER(wxBORDER_STATIC)
  64     wxFLAGS_MEMBER(wxBORDER_NONE)
  65
  66     // old style border flags
  67     wxFLAGS_MEMBER(wxSIMPLE_BORDER)
  68     wxFLAGS_MEMBER(wxSUNKEN_BORDER)
  69     wxFLAGS_MEMBER(wxDOUBLE_BORDER)
  70     wxFLAGS_MEMBER(wxRAISED_BORDER)
  71     wxFLAGS_MEMBER(wxSTATIC_BORDER)
  72     wxFLAGS_MEMBER(wxBORDER)
  73
  74     // standard window styles
  75     wxFLAGS_MEMBER(wxTAB_TRAVERSAL)
  76     wxFLAGS_MEMBER(wxCLIP_CHILDREN)
  77     wxFLAGS_MEMBER(wxTRANSPARENT_WINDOW)
  78     wxFLAGS_MEMBER(wxWANTS_CHARS)
  79     wxFLAGS_MEMBER(wxFULL_REPAINT_ON_RESIZE)
  80     wxFLAGS_MEMBER(wxALWAYS_SHOW_SB )
  81     wxFLAGS_MEMBER(wxVSCROLL)
  82     wxFLAGS_MEMBER(wxHSCROLL)
  83
  84     wxFLAGS_MEMBER(wxCB_SIMPLE)
  85     wxFLAGS_MEMBER(wxCB_SORT)
  86     wxFLAGS_MEMBER(wxCB_READONLY)
  87     wxFLAGS_MEMBER(wxCB_DROPDOWN)
  88
  89 wxEND_FLAGS( wxComboBoxStyle )
  90
  91 IMPLEMENT_DYNAMIC_CLASS_XTI(wxComboBox, wxChoice,"wx/combobox.h")
  92
  93 wxBEGIN_PROPERTIES_TABLE(wxComboBox)
  94     wxEVENT_PROPERTY( Select , wxEVT_COMMAND_COMBOBOX_SELECTED , wxCommandEvent )
  95     wxEVENT_PROPERTY( TextEnter , wxEVT_COMMAND_TEXT_ENTER , wxCommandEvent )
  96
  97     // TODO DELEGATES
  98     wxPROPERTY( Font , wxFont , SetFont , GetFont  , EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
  99     wxPROPERTY_COLLECTION( Choices , wxArrayString , wxString , AppendString , GetStrings , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
 100     wxPROPERTY( Value ,wxString, SetValue, GetValue, EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
 101     wxPROPERTY( Selection ,int, SetSelection, GetSelection, EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
 102     wxPROPERTY_FLAGS( WindowStyle , wxComboBoxStyle , long , SetWindowStyleFlag , GetWindowStyleFlag , EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group")) // style
 103 wxEND_PROPERTIES_TABLE()
 104
 105 wxBEGIN_HANDLERS_TABLE(wxComboBox)
 106 wxEND_HANDLERS_TABLE()
 107
 108 wxCONSTRUCTOR_5( wxComboBox , wxWindow* , Parent , wxWindowID , Id , wxString , Value , wxPoint , Position , wxSize , Size )
 109
 110 #else
 111
 112 IMPLEMENT_DYNAMIC_CLASS(wxComboBox, wxChoice)
 113
 114 #endif
 115
 116 BEGIN_EVENT_TABLE(wxComboBox, wxControl)
 117     EVT_MENU(wxID_CUT, wxComboBox::OnCut)
 118     EVT_MENU(wxID_COPY, wxComboBox::OnCopy)
 119     EVT_MENU(wxID_PASTE, wxComboBox::OnPaste)
 120     EVT_MENU(wxID_UNDO, wxComboBox::OnUndo)
 121     EVT_MENU(wxID_REDO, wxComboBox::OnRedo)
 122     EVT_MENU(wxID_CLEAR, wxComboBox::OnDelete)
 123     EVT_MENU(wxID_SELECTALL, wxComboBox::OnSelectAll)
 124
 125     EVT_UPDATE_UI(wxID_CUT, wxComboBox::OnUpdateCut)
 126     EVT_UPDATE_UI(wxID_COPY, wxComboBox::OnUpdateCopy)
 127     EVT_UPDATE_UI(wxID_PASTE, wxComboBox::OnUpdatePaste)
 128     EVT_UPDATE_UI(wxID_UNDO, wxComboBox::OnUpdateUndo)
 129     EVT_UPDATE_UI(wxID_REDO, wxComboBox::OnUpdateRedo)
 130     EVT_UPDATE_UI(wxID_CLEAR, wxComboBox::OnUpdateDelete)
 131     EVT_UPDATE_UI(wxID_SELECTALL, wxComboBox::OnUpdateSelectAll)
 132 END_EVENT_TABLE()
 133
 134 // ----------------------------------------------------------------------------
 135 // function prototypes
 136 // ----------------------------------------------------------------------------
 137
 138 LRESULT APIENTRY _EXPORT wxComboEditWndProc(HWND hWnd,
 139                                             UINT message,
 140                                             WPARAM wParam,
 141                                             LPARAM lParam);
 142
 143 // ---------------------------------------------------------------------------
 144 // global vars
 145 // ---------------------------------------------------------------------------
 146
 147 // the pointer to standard radio button wnd proc
 148 static WNDPROC gs_wndprocEdit = (WNDPROC)NULL;
 149
 150 // ============================================================================
 151 // implementation
 152 // ============================================================================
 153
 154 // ----------------------------------------------------------------------------
 155 // wnd proc for subclassed edit control
 156 // ----------------------------------------------------------------------------
 157
 158 LRESULT APIENTRY _EXPORT wxComboEditWndProc(HWND hWnd,
 159                                             UINT message,
 160                                             WPARAM wParam,
 161                                             LPARAM lParam)
 162 {
 163     HWND hwndCombo = ::GetParent(hWnd);
 164     wxWindow *win = wxFindWinFromHandle((WXHWND)hwndCombo);
 165
 166     switch ( message )
 167     {
 168         // forward some messages to the combobox to generate the appropriate
 169         // wxEvents from them
 170         case WM_KEYUP:
 171         case WM_KEYDOWN:
 172         case WM_CHAR:
 173         case WM_SYSCHAR:
 174         case WM_SYSKEYDOWN:
 175         case WM_SYSKEYUP:
 176         case WM_SETFOCUS:
 177         case WM_KILLFOCUS:
 178             {
 179                 wxComboBox *combo = wxDynamicCast(win, wxComboBox);
 180                 if ( !combo )
 181                 {
 182                     // we can get WM_KILLFOCUS while our parent is already half
 183                     // destroyed and hence doesn't look like a combobx any
 184                     // longer, check for it to avoid bogus assert failures
 185                     if ( !win->IsBeingDeleted() )
 186                     {
 187                         wxFAIL_MSG( _T("should have combo as parent") );
 188                     }
 189                 }
 190                 else if ( combo->MSWProcessEditMsg(message, wParam, lParam) )
 191                 {
 192                     // handled by parent
 193                     return 0;
 194                 }
 195             }
 196             break;
 197
 198         case WM_GETDLGCODE:
 199             {
 200                 wxCHECK_MSG( win, 0, _T("should have a parent") );
 201
 202                 if ( win->GetWindowStyle() & wxTE_PROCESS_ENTER )
 203                 {
 204                     // need to return a custom dlg code or we'll never get it
 205                     return DLGC_WANTMESSAGE;
 206                 }
 207             }
 208             break;
 209     }
 210
 211     return ::CallWindowProc(CASTWNDPROC gs_wndprocEdit, hWnd, message, wParam, lParam);
 212 }
 213
 214 // ----------------------------------------------------------------------------
 215 // wxComboBox callbacks
 216 // ----------------------------------------------------------------------------
 217
 218 WXLRESULT wxComboBox::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam)
 219 {
 220     // TODO: handle WM_CTLCOLOR messages from our EDIT control to be able to
 221     //       set its colour correctly (to be the same as our own one)
 222
 223     switch ( nMsg )
 224     {
 225         case WM_SIZE:
 226         // wxStaticBox can generate this message, when modifying the control's style.
 227         // This causes the content of the combobox to be selected, for some reason.
 228         case WM_STYLECHANGED:
 229             {
 230                 // combobox selection sometimes spontaneously changes when its
 231                 // size changes, restore it to the old value if necessary
 232                 if ( !GetEditHWNDIfAvailable() )
 233                     break;
 234
 235                 long fromOld, toOld;
 236                 GetSelection(&fromOld, &toOld);
 237
 238                 // if an editable combobox has a not empty text not from the
 239                 // list, it tries to autocomplete it from the list when it is
 240                 // resized, but we don't want this to happen as it doesn't seem
 241                 // to make any sense, so we forcefully restore the old text
 242                 wxString textOld;
 243                 if ( !HasFlag(wxCB_READONLY) && GetCurrentSelection() == -1 )
 244                     textOld = GetValue();
 245
 246                 // eliminate flickering during following hacks
 247                 wxWindowUpdateLocker lock(this);
 248
 249                 WXLRESULT result = wxChoice::MSWWindowProc(nMsg, wParam, lParam);
 250
 251                 if ( !textOld.empty() && GetValue() != textOld )
 252                     SetLabel(textOld);
 253
 254                 long fromNew, toNew;
 255                 GetSelection(&fromNew, &toNew);
 256
 257                 if ( fromOld != fromNew || toOld != toNew )
 258                 {
 259                     SetSelection(fromOld, toOld);
 260                 }
 261
 262                 return result;
 263             }
 264     }
 265
 266     return wxChoice::MSWWindowProc(nMsg, wParam, lParam);
 267 }
 268
 269 bool wxComboBox::MSWProcessEditMsg(WXUINT msg, WXWPARAM wParam, WXLPARAM lParam)
 270 {
 271     switch ( msg )
 272     {
 273         case WM_CHAR:
 274             // for compatibility with wxTextCtrl, generate a special message
 275             // when Enter is pressed
 276             if ( wParam == VK_RETURN )
 277             {
 278                 if (SendMessage(GetHwnd(), CB_GETDROPPEDSTATE, 0, 0))
 279                     return false;
 280
 281                 wxCommandEvent event(wxEVT_COMMAND_TEXT_ENTER, m_windowId);
 282
 283                 const int sel = GetSelection();
 284                 event.SetInt(sel);
 285                 event.SetString(GetValue());
 286                 InitCommandEventWithItems(event, sel);
 287
 288                 if ( ProcessCommand(event) )
 289                 {
 290                     // don't let the event through to the native control
 291                     // because it doesn't need it and may generate an annoying
 292                     // beep if it gets it
 293                     return true;
 294                 }
 295             }
 296             // fall through
 297
 298         case WM_SYSCHAR:
 299             return HandleChar(wParam, lParam, true /* isASCII */);
 300
 301         case WM_SYSKEYDOWN:
 302         case WM_KEYDOWN:
 303             return HandleKeyDown(wParam, lParam);
 304
 305         case WM_SYSKEYUP:
 306         case WM_KEYUP:
 307             return HandleKeyUp(wParam, lParam);
 308
 309         case WM_SETFOCUS:
 310             return HandleSetFocus((WXHWND)wParam);
 311
 312         case WM_KILLFOCUS:
 313             return HandleKillFocus((WXHWND)wParam);
 314
 315         case WM_CUT:
 316         case WM_COPY:
 317         case WM_PASTE:
 318             return HandleClipboardEvent(msg);
 319     }
 320
 321     return false;
 322 }
 323
 324 bool wxComboBox::MSWCommand(WXUINT param, WXWORD id)
 325 {
 326     int sel = -1;
 327     wxString value;
 328
 329     switch ( param )
 330     {
 331         case CBN_DROPDOWN:
 332             // remember the last selection, just as wxChoice does
 333             m_lastAcceptedSelection = GetCurrentSelection();
 334             if ( m_lastAcceptedSelection == -1 )
 335             {
 336                 // but unlike with wxChoice we may have no selection but still
 337                 // have some text and we should avoid erasing it if the drop
 338                 // down is cancelled (see #8474)
 339                 m_lastAcceptedSelection = wxID_NONE;
 340             }
 341             break;
 342
 343         case CBN_SELENDOK:
 344 #ifndef __SMARTPHONE__
 345             // we need to reset this to prevent the selection from being undone
 346             // by wxChoice, see wxChoice::MSWCommand() and comments there
 347             m_lastAcceptedSelection = wxID_NONE;
 348 #endif
 349
 350             // set these variables so that they could be also fixed in
 351             // CBN_EDITCHANGE below
 352             sel = GetSelection();
 353             value = GetStringSelection();
 354
 355             // this string is going to become the new combobox value soon but
 356             // we need it to be done right now, otherwise the event handler
 357             // could get a wrong value when it calls our GetValue()
 358             ::SetWindowText(GetHwnd(), value.wx_str());
 359
 360             {
 361                 wxCommandEvent event(wxEVT_COMMAND_COMBOBOX_SELECTED, GetId());
 362                 event.SetInt(sel);
 363                 event.SetString(value);
 364                 InitCommandEventWithItems(event, sel);
 365
 366                 ProcessCommand(event);
 367             }
 368
 369             // fall through: for compability with wxGTK, also send the text
 370             // update event when the selection changes (this also seems more
 371             // logical as the text does change)
 372
 373         case CBN_EDITCHANGE:
 374             if ( m_allowTextEvents )
 375             {
 376                 wxCommandEvent event(wxEVT_COMMAND_TEXT_UPDATED, GetId());
 377
 378                 // if sel != -1, value was already initialized above
 379                 if ( sel == -1 )
 380                 {
 381                     value = wxGetWindowText(GetHwnd());
 382                 }
 383
 384                 event.SetString(value);
 385                 InitCommandEventWithItems(event, sel);
 386
 387                 ProcessCommand(event);
 388             }
 389             break;
 390
 391         default:
 392             return wxChoice::MSWCommand(param, id);
 393     }
 394
 395     // skip wxChoice version as it would generate its own events for
 396     // CBN_SELENDOK and also interfere with our handling of CBN_DROPDOWN
 397     return true;
 398 }
 399
 400 bool wxComboBox::MSWShouldPreProcessMessage(WXMSG *pMsg)
 401 {
 402     // prevent command accelerators from stealing editing
 403     // hotkeys when we have the focus
 404     if (wxIsCtrlDown())
 405     {
 406         WPARAM vkey = pMsg->wParam;
 407
 408         switch (vkey)
 409         {
 410             case 'C':
 411             case 'V':
 412             case 'X':
 413             case VK_INSERT:
 414             case VK_DELETE:
 415             case VK_HOME:
 416             case VK_END:
 417                 return false;
 418         }
 419     }
 420
 421     return wxChoice::MSWShouldPreProcessMessage(pMsg);
 422 }
 423
 424 WXHWND wxComboBox::GetEditHWNDIfAvailable() const
 425 {
 426     // notice that a slightly safer alternative could be to use FindWindowEx()
 427     // but it's not available under WinCE so just take the first child for now
 428     // to keep one version of the code for all platforms and fix it later if
 429     // problems are discovered
 430
 431     // we assume that the only child of the combobox is the edit window
 432     return (WXHWND)::GetWindow(GetHwnd(), GW_CHILD);
 433 }
 434
 435 WXHWND wxComboBox::GetEditHWND() const
 436 {
 437     // this function should not be called for wxCB_READONLY controls, it is
 438     // the callers responsibility to check this
 439     wxASSERT_MSG( !HasFlag(wxCB_READONLY),
 440                   _T("read-only combobox doesn't have any edit control") );
 441
 442     WXHWND hWndEdit = GetEditHWNDIfAvailable();
 443     wxASSERT_MSG( hWndEdit, _T("combobox without edit control?") );
 444
 445     return hWndEdit;
 446 }
 447
 448 // ----------------------------------------------------------------------------
 449 // wxComboBox creation
 450 // ----------------------------------------------------------------------------
 451
 452 bool wxComboBox::Create(wxWindow *parent, wxWindowID id,
 453                         const wxString& value,
 454                         const wxPoint& pos,
 455                         const wxSize& size,
 456                         int n, const wxString choices[],
 457                         long style,
 458                         const wxValidator& validator,
 459                         const wxString& name)
 460 {
 461     // pretend that wxComboBox is hidden while it is positioned and resized and
 462     // show it only right before leaving this method because otherwise there is
 463     // some noticeable flicker while the control rearranges itself
 464     m_isShown = false;
 465
 466     if ( !CreateAndInit(parent, id, pos, size, n, choices, style,
 467                         validator, name) )
 468         return false;
 469
 470     // we shouldn't call SetValue() for an empty string because this would
 471     // (correctly) result in an assert with a read only combobox and is useless
 472     // for the other ones anyhow
 473     if ( !value.empty() )
 474         SetValue(value);
 475
 476     // a (not read only) combobox is, in fact, 2 controls: the combobox itself
 477     // and an edit control inside it and if we want to catch events from this
 478     // edit control, we must subclass it as well
 479     if ( !(style & wxCB_READONLY) )
 480     {
 481         gs_wndprocEdit = wxSetWindowProc((HWND)GetEditHWND(), wxComboEditWndProc);
 482     }
 483
 484     // and finally, show the control
 485     Show(true);
 486
 487     return true;
 488 }
 489
 490 bool wxComboBox::Create(wxWindow *parent, wxWindowID id,
 491                         const wxString& value,
 492                         const wxPoint& pos,
 493                         const wxSize& size,
 494                         const wxArrayString& choices,
 495                         long style,
 496                         const wxValidator& validator,
 497                         const wxString& name)
 498 {
 499     wxCArrayString chs(choices);
 500     return Create(parent, id, value, pos, size, chs.GetCount(),
 501                   chs.GetStrings(), style, validator, name);
 502 }
 503
 504 WXDWORD wxComboBox::MSWGetStyle(long style, WXDWORD *exstyle) const
 505 {
 506     // we never have an external border
 507     WXDWORD msStyle = wxChoice::MSWGetStyle
 508                       (
 509                         (style & ~wxBORDER_MASK) | wxBORDER_NONE, exstyle
 510                       );
 511
 512     // usually WS_TABSTOP is added by wxControl::MSWGetStyle() but as we're
 513     // created hidden (see Create() above), it is not done for us but we still
 514     // want to have this style
 515     msStyle |= WS_TABSTOP;
 516
 517     // remove the style always added by wxChoice
 518     msStyle &= ~CBS_DROPDOWNLIST;
 519
 520     if ( style & wxCB_READONLY )
 521         msStyle |= CBS_DROPDOWNLIST;
 522 #ifndef __WXWINCE__
 523     else if ( style & wxCB_SIMPLE )
 524         msStyle |= CBS_SIMPLE; // A list (shown always) and edit control
 525 #endif
 526     else
 527         msStyle |= CBS_DROPDOWN;
 528
 529     // there is no reason to not always use CBS_AUTOHSCROLL, so do use it
 530     msStyle |= CBS_AUTOHSCROLL;
 531
 532     // NB: we used to also add CBS_NOINTEGRALHEIGHT here but why?
 533
 534     return msStyle;
 535 }
 536
 537 // ----------------------------------------------------------------------------
 538 // wxComboBox text control-like methods
 539 // ----------------------------------------------------------------------------
 540
 541 wxString wxComboBox::GetValue() const
 542 {
 543     return HasFlag(wxCB_READONLY) ? GetStringSelection()
 544                                   : wxTextEntry::GetValue();
 545 }
 546
 547 void wxComboBox::SetValue(const wxString& value)
 548 {
 549     if ( HasFlag(wxCB_READONLY) )
 550         SetStringSelection(value);
 551     else
 552         wxTextEntry::SetValue(value);
 553 }
 554
 555 void wxComboBox::Clear()
 556 {
 557     wxChoice::Clear();
 558     if ( !HasFlag(wxCB_READONLY) )
 559         wxTextEntry::Clear();
 560 }
 561
 562 void wxComboBox::GetSelection(long *from, long *to) const
 563 {
 564     if ( !HasFlag(wxCB_READONLY) )
 565     {
 566         wxTextEntry::GetSelection(from, to);
 567     }
 568     else // text selection doesn't make sense for read only comboboxes
 569     {
 570         if ( from )
 571             *from = -1;
 572         if ( to )
 573             *to = -1;
 574     }
 575 }
 576
 577 bool wxComboBox::IsEditable() const
 578 {
 579     return !HasFlag(wxCB_READONLY) && wxTextEntry::IsEditable();
 580 }
 581
 582 // ----------------------------------------------------------------------------
 583 // standard event handling
 584 // ----------------------------------------------------------------------------
 585
 586 void wxComboBox::OnCut(wxCommandEvent& WXUNUSED(event))
 587 {
 588     Cut();
 589 }
 590
 591 void wxComboBox::OnCopy(wxCommandEvent& WXUNUSED(event))
 592 {
 593     Copy();
 594 }
 595
 596 void wxComboBox::OnPaste(wxCommandEvent& WXUNUSED(event))
 597 {
 598     Paste();
 599 }
 600
 601 void wxComboBox::OnUndo(wxCommandEvent& WXUNUSED(event))
 602 {
 603     Undo();
 604 }
 605
 606 void wxComboBox::OnRedo(wxCommandEvent& WXUNUSED(event))
 607 {
 608     Redo();
 609 }
 610
 611 void wxComboBox::OnDelete(wxCommandEvent& WXUNUSED(event))
 612 {
 613     RemoveSelection();
 614 }
 615
 616 void wxComboBox::OnSelectAll(wxCommandEvent& WXUNUSED(event))
 617 {
 618     SelectAll();
 619 }
 620
 621 void wxComboBox::OnUpdateCut(wxUpdateUIEvent& event)
 622 {
 623     event.Enable( CanCut() );
 624 }
 625
 626 void wxComboBox::OnUpdateCopy(wxUpdateUIEvent& event)
 627 {
 628     event.Enable( CanCopy() );
 629 }
 630
 631 void wxComboBox::OnUpdatePaste(wxUpdateUIEvent& event)
 632 {
 633     event.Enable( CanPaste() );
 634 }
 635
 636 void wxComboBox::OnUpdateUndo(wxUpdateUIEvent& event)
 637 {
 638     event.Enable( IsEditable() && CanUndo() );
 639 }
 640
 641 void wxComboBox::OnUpdateRedo(wxUpdateUIEvent& event)
 642 {
 643     event.Enable( IsEditable() && CanRedo() );
 644 }
 645
 646 void wxComboBox::OnUpdateDelete(wxUpdateUIEvent& event)
 647 {
 648     event.Enable(IsEditable() && HasSelection());
 649 }
 650
 651 void wxComboBox::OnUpdateSelectAll(wxUpdateUIEvent& event)
 652 {
 653     event.Enable(IsEditable() && !wxTextEntry::IsEmpty());
 654 }
 655
 656 #if wxUSE_TOOLTIPS
 657
 658 void wxComboBox::DoSetToolTip(wxToolTip *tip)
 659 {
 660     wxChoice::DoSetToolTip(tip);
 661
 662     if ( tip && !HasFlag(wxCB_READONLY) )
 663         tip->Add(GetEditHWND());
 664 }
 665
 666 #endif // wxUSE_TOOLTIPS
 667
 668 #endif // wxUSE_COMBOBOX