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, wxChoice,"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, wxChoice)
 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
 210     return ::CallWindowProc(CASTWNDPROC gs_wndprocEdit, hWnd, message, wParam, lParam);
 211 }
 212
 213 // ----------------------------------------------------------------------------
 214 // wxComboBox callbacks
 215 // ----------------------------------------------------------------------------
 216
 217 WXLRESULT wxComboBox::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam)
 218 {
 219     // TODO: handle WM_CTLCOLOR messages from our EDIT control to be able to
 220     //       set its colour correctly (to be the same as our own one)
 221
 222     switch ( nMsg )
 223     {
 224         case WM_SIZE:
 225         // wxStaticBox can generate this message, when modifying the control's style.
 226         // This causes the content of the combobox to be selected, for some reason.
 227         case WM_STYLECHANGED:
 228             {
 229                 // combobox selection sometimes spontaneously changes when its
 230                 // size changes, restore it to the old value if necessary
 231                 if ( !GetEditHWNDIfAvailable() )
 232                     break;
 233
 234                 long fromOld, toOld;
 235                 GetSelection(&fromOld, &toOld);
 236                 WXLRESULT result = wxChoice::MSWWindowProc(nMsg, wParam, lParam);
 237
 238                 long fromNew, toNew;
 239                 GetSelection(&fromNew, &toNew);
 240
 241                 if ( fromOld != fromNew || toOld != toNew )
 242                 {
 243                     SetSelection(fromOld, toOld);
 244                 }
 245
 246                 return result;
 247             }
 248     }
 249
 250     return wxChoice::MSWWindowProc(nMsg, wParam, lParam);
 251 }
 252
 253 bool wxComboBox::MSWProcessEditMsg(WXUINT msg, WXWPARAM wParam, WXLPARAM lParam)
 254 {
 255     switch ( msg )
 256     {
 257         case WM_CHAR:
 258             // for compatibility with wxTextCtrl, generate a special message
 259             // when Enter is pressed
 260             if ( wParam == VK_RETURN )
 261             {
 262                 if (SendMessage(GetHwnd(), CB_GETDROPPEDSTATE, 0, 0))
 263                     return false;
 264
 265                 wxCommandEvent event(wxEVT_COMMAND_TEXT_ENTER, m_windowId);
 266
 267                 const int sel = GetSelection();
 268                 event.SetInt(sel);
 269                 event.SetString(GetValue());
 270                 InitCommandEventWithItems(event, sel);
 271
 272                 if ( ProcessCommand(event) )
 273                 {
 274                     // don't let the event through to the native control
 275                     // because it doesn't need it and may generate an annoying
 276                     // beep if it gets it
 277                     return true;
 278                 }
 279             }
 280             // fall through
 281
 282         case WM_SYSCHAR:
 283             return HandleChar(wParam, lParam, true /* isASCII */);
 284
 285         case WM_SYSKEYDOWN:
 286         case WM_KEYDOWN:
 287             return HandleKeyDown(wParam, lParam);
 288
 289         case WM_SYSKEYUP:
 290         case WM_KEYUP:
 291             return HandleKeyUp(wParam, lParam);
 292
 293         case WM_SETFOCUS:
 294             return HandleSetFocus((WXHWND)wParam);
 295
 296         case WM_KILLFOCUS:
 297             return HandleKillFocus((WXHWND)wParam);
 298
 299         case WM_CUT:
 300         case WM_COPY:
 301         case WM_PASTE:
 302             return HandleClipboardEvent(msg);
 303     }
 304
 305     return false;
 306 }
 307
 308 bool wxComboBox::MSWCommand(WXUINT param, WXWORD id)
 309 {
 310     int sel = -1;
 311     wxString value;
 312
 313     switch ( param )
 314     {
 315         case CBN_DROPDOWN:
 316             // remember the last selection, just as wxChoice does
 317             m_lastAcceptedSelection = GetCurrentSelection();
 318             if ( m_lastAcceptedSelection == -1 )
 319             {
 320                 // but unlike with wxChoice we may have no selection but still
 321                 // have some text and we should avoid erasing it if the drop
 322                 // down is cancelled (see #8474)
 323                 m_lastAcceptedSelection = wxID_NONE;
 324             }
 325             break;
 326
 327         case CBN_SELENDOK:
 328 #ifndef __SMARTPHONE__
 329             // we need to reset this to prevent the selection from being undone
 330             // by wxChoice, see wxChoice::MSWCommand() and comments there
 331             m_lastAcceptedSelection = wxID_NONE;
 332 #endif
 333
 334             // set these variables so that they could be also fixed in
 335             // CBN_EDITCHANGE below
 336             sel = GetSelection();
 337             value = GetStringSelection();
 338
 339             // this string is going to become the new combobox value soon but
 340             // we need it to be done right now, otherwise the event handler
 341             // could get a wrong value when it calls our GetValue()
 342             ::SetWindowText(GetHwnd(), value.wx_str());
 343
 344             {
 345                 wxCommandEvent event(wxEVT_COMMAND_COMBOBOX_SELECTED, GetId());
 346                 event.SetInt(sel);
 347                 event.SetString(value);
 348                 InitCommandEventWithItems(event, sel);
 349
 350                 ProcessCommand(event);
 351             }
 352
 353             // fall through: for compability with wxGTK, also send the text
 354             // update event when the selection changes (this also seems more
 355             // logical as the text does change)
 356
 357         case CBN_EDITCHANGE:
 358             if ( m_allowTextEvents )
 359             {
 360                 wxCommandEvent event(wxEVT_COMMAND_TEXT_UPDATED, GetId());
 361
 362                 // if sel != -1, value was already initialized above
 363                 if ( sel == -1 )
 364                 {
 365                     value = wxGetWindowText(GetHwnd());
 366                 }
 367
 368                 event.SetString(value);
 369                 InitCommandEventWithItems(event, sel);
 370
 371                 ProcessCommand(event);
 372             }
 373             break;
 374
 375         default:
 376             return wxChoice::MSWCommand(param, id);
 377     }
 378
 379     // skip wxChoice version as it would generate its own events for
 380     // CBN_SELENDOK and also interfere with our handling of CBN_DROPDOWN
 381     return true;
 382 }
 383
 384 bool wxComboBox::MSWShouldPreProcessMessage(WXMSG *pMsg)
 385 {
 386     // prevent command accelerators from stealing editing
 387     // hotkeys when we have the focus
 388     if (wxIsCtrlDown())
 389     {
 390         WPARAM vkey = pMsg->wParam;
 391
 392         switch (vkey)
 393         {
 394             case 'C':
 395             case 'V':
 396             case 'X':
 397             case VK_INSERT:
 398             case VK_DELETE:
 399             case VK_HOME:
 400             case VK_END:
 401                 return false;
 402         }
 403     }
 404
 405     return wxChoice::MSWShouldPreProcessMessage(pMsg);
 406 }
 407
 408 WXHWND wxComboBox::GetEditHWNDIfAvailable() const
 409 {
 410     // notice that a slightly safer alternative could be to use FindWindowEx()
 411     // but it's not available under WinCE so just take the first child for now
 412     // to keep one version of the code for all platforms and fix it later if
 413     // problems are discovered
 414
 415     // we assume that the only child of the combobox is the edit window
 416     return (WXHWND)::GetWindow(GetHwnd(), GW_CHILD);
 417 }
 418
 419 WXHWND wxComboBox::GetEditHWND() const
 420 {
 421     // this function should not be called for wxCB_READONLY controls, it is
 422     // the callers responsibility to check this
 423     wxASSERT_MSG( !HasFlag(wxCB_READONLY),
 424                   _T("read-only combobox doesn't have any edit control") );
 425
 426     WXHWND hWndEdit = GetEditHWNDIfAvailable();
 427     wxASSERT_MSG( hWndEdit, _T("combobox without edit control?") );
 428
 429     return hWndEdit;
 430 }
 431
 432 // ----------------------------------------------------------------------------
 433 // wxComboBox creation
 434 // ----------------------------------------------------------------------------
 435
 436 bool wxComboBox::Create(wxWindow *parent, wxWindowID id,
 437                         const wxString& value,
 438                         const wxPoint& pos,
 439                         const wxSize& size,
 440                         int n, const wxString choices[],
 441                         long style,
 442                         const wxValidator& validator,
 443                         const wxString& name)
 444 {
 445     // pretend that wxComboBox is hidden while it is positioned and resized and
 446     // show it only right before leaving this method because otherwise there is
 447     // some noticeable flicker while the control rearranges itself
 448     m_isShown = false;
 449
 450     if ( !CreateAndInit(parent, id, pos, size, n, choices, style,
 451                         validator, name) )
 452         return false;
 453
 454     // we shouldn't call SetValue() for an empty string because this would
 455     // (correctly) result in an assert with a read only combobox and is useless
 456     // for the other ones anyhow
 457     if ( !value.empty() )
 458         SetValue(value);
 459
 460     // a (not read only) combobox is, in fact, 2 controls: the combobox itself
 461     // and an edit control inside it and if we want to catch events from this
 462     // edit control, we must subclass it as well
 463     if ( !(style & wxCB_READONLY) )
 464     {
 465         gs_wndprocEdit = wxSetWindowProc((HWND)GetEditHWND(), wxComboEditWndProc);
 466     }
 467
 468     // and finally, show the control
 469     Show(true);
 470
 471     return true;
 472 }
 473
 474 bool wxComboBox::Create(wxWindow *parent, wxWindowID id,
 475                         const wxString& value,
 476                         const wxPoint& pos,
 477                         const wxSize& size,
 478                         const wxArrayString& choices,
 479                         long style,
 480                         const wxValidator& validator,
 481                         const wxString& name)
 482 {
 483     wxCArrayString chs(choices);
 484     return Create(parent, id, value, pos, size, chs.GetCount(),
 485                   chs.GetStrings(), style, validator, name);
 486 }
 487
 488 WXDWORD wxComboBox::MSWGetStyle(long style, WXDWORD *exstyle) const
 489 {
 490     // we never have an external border
 491     WXDWORD msStyle = wxChoice::MSWGetStyle
 492                       (
 493                         (style & ~wxBORDER_MASK) | wxBORDER_NONE, exstyle
 494                       );
 495
 496     // usually WS_TABSTOP is added by wxControl::MSWGetStyle() but as we're
 497     // created hidden (see Create() above), it is not done for us but we still
 498     // want to have this style
 499     msStyle |= WS_TABSTOP;
 500
 501     // remove the style always added by wxChoice
 502     msStyle &= ~CBS_DROPDOWNLIST;
 503
 504     if ( style & wxCB_READONLY )
 505         msStyle |= CBS_DROPDOWNLIST;
 506 #ifndef __WXWINCE__
 507     else if ( style & wxCB_SIMPLE )
 508         msStyle |= CBS_SIMPLE; // A list (shown always) and edit control
 509 #endif
 510     else
 511         msStyle |= CBS_DROPDOWN;
 512
 513     // there is no reason to not always use CBS_AUTOHSCROLL, so do use it
 514     msStyle |= CBS_AUTOHSCROLL;
 515
 516     // NB: we used to also add CBS_NOINTEGRALHEIGHT here but why?
 517
 518     return msStyle;
 519 }
 520
 521 // ----------------------------------------------------------------------------
 522 // wxComboBox text control-like methods
 523 // ----------------------------------------------------------------------------
 524
 525 wxString wxComboBox::GetValue() const
 526 {
 527     return HasFlag(wxCB_READONLY) ? GetStringSelection()
 528                                   : wxTextEntry::GetValue();
 529 }
 530
 531 void wxComboBox::SetValue(const wxString& value)
 532 {
 533     if ( HasFlag(wxCB_READONLY) )
 534         SetStringSelection(value);
 535     else
 536         wxTextEntry::SetValue(value);
 537 }
 538
 539 void wxComboBox::Clear()
 540 {
 541     wxChoice::Clear();
 542     if ( !HasFlag(wxCB_READONLY) )
 543         wxTextEntry::Clear();
 544 }
 545
 546 void wxComboBox::GetSelection(long *from, long *to) const
 547 {
 548     if ( !HasFlag(wxCB_READONLY) )
 549     {
 550         wxTextEntry::GetSelection(from, to);
 551     }
 552     else // text selection doesn't make sense for read only comboboxes
 553     {
 554         if ( from )
 555             *from = -1;
 556         if ( to )
 557             *to = -1;
 558     }
 559 }
 560
 561 bool wxComboBox::IsEditable() const
 562 {
 563     return !HasFlag(wxCB_READONLY) && wxTextEntry::IsEditable();
 564 }
 565
 566 // ----------------------------------------------------------------------------
 567 // standard event handling
 568 // ----------------------------------------------------------------------------
 569
 570 void wxComboBox::OnCut(wxCommandEvent& WXUNUSED(event))
 571 {
 572     Cut();
 573 }
 574
 575 void wxComboBox::OnCopy(wxCommandEvent& WXUNUSED(event))
 576 {
 577     Copy();
 578 }
 579
 580 void wxComboBox::OnPaste(wxCommandEvent& WXUNUSED(event))
 581 {
 582     Paste();
 583 }
 584
 585 void wxComboBox::OnUndo(wxCommandEvent& WXUNUSED(event))
 586 {
 587     Undo();
 588 }
 589
 590 void wxComboBox::OnRedo(wxCommandEvent& WXUNUSED(event))
 591 {
 592     Redo();
 593 }
 594
 595 void wxComboBox::OnDelete(wxCommandEvent& WXUNUSED(event))
 596 {
 597     RemoveSelection();
 598 }
 599
 600 void wxComboBox::OnSelectAll(wxCommandEvent& WXUNUSED(event))
 601 {
 602     SelectAll();
 603 }
 604
 605 void wxComboBox::OnUpdateCut(wxUpdateUIEvent& event)
 606 {
 607     event.Enable( CanCut() );
 608 }
 609
 610 void wxComboBox::OnUpdateCopy(wxUpdateUIEvent& event)
 611 {
 612     event.Enable( CanCopy() );
 613 }
 614
 615 void wxComboBox::OnUpdatePaste(wxUpdateUIEvent& event)
 616 {
 617     event.Enable( CanPaste() );
 618 }
 619
 620 void wxComboBox::OnUpdateUndo(wxUpdateUIEvent& event)
 621 {
 622     event.Enable( IsEditable() && CanUndo() );
 623 }
 624
 625 void wxComboBox::OnUpdateRedo(wxUpdateUIEvent& event)
 626 {
 627     event.Enable( IsEditable() && CanRedo() );
 628 }
 629
 630 void wxComboBox::OnUpdateDelete(wxUpdateUIEvent& event)
 631 {
 632     event.Enable(IsEditable() && HasSelection());
 633 }
 634
 635 void wxComboBox::OnUpdateSelectAll(wxUpdateUIEvent& event)
 636 {
 637     event.Enable(IsEditable() && !wxTextEntry::IsEmpty());
 638 }
 639
 640 #if wxUSE_TOOLTIPS
 641
 642 void wxComboBox::DoSetToolTip(wxToolTip *tip)
 643 {
 644     wxChoice::DoSetToolTip(tip);
 645
 646     if ( tip && !HasFlag(wxCB_READONLY) )
 647         tip->Add(GetEditHWND());
 648 }
 649
 650 #endif // wxUSE_TOOLTIPS
 651
 652 #endif // wxUSE_COMBOBOX