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_UXTHEME
  46     #include "wx/msw/uxtheme.h"
  47 #endif
  48
  49 #if wxUSE_TOOLTIPS
  50     #include "wx/tooltip.h"
  51 #endif // wxUSE_TOOLTIPS
  52
  53 // ----------------------------------------------------------------------------
  54 // wxWin macros
  55 // ----------------------------------------------------------------------------
  56
  57 #if wxUSE_EXTENDED_RTTI
  58 WX_DEFINE_FLAGS( wxComboBoxStyle )
  59
  60 wxBEGIN_FLAGS( wxComboBoxStyle )
  61     // new style border flags, we put them first to
  62     // use them for streaming out
  63     wxFLAGS_MEMBER(wxBORDER_SIMPLE)
  64     wxFLAGS_MEMBER(wxBORDER_SUNKEN)
  65     wxFLAGS_MEMBER(wxBORDER_DOUBLE)
  66     wxFLAGS_MEMBER(wxBORDER_RAISED)
  67     wxFLAGS_MEMBER(wxBORDER_STATIC)
  68     wxFLAGS_MEMBER(wxBORDER_NONE)
  69
  70     // old style border flags
  71     wxFLAGS_MEMBER(wxSIMPLE_BORDER)
  72     wxFLAGS_MEMBER(wxSUNKEN_BORDER)
  73     wxFLAGS_MEMBER(wxDOUBLE_BORDER)
  74     wxFLAGS_MEMBER(wxRAISED_BORDER)
  75     wxFLAGS_MEMBER(wxSTATIC_BORDER)
  76     wxFLAGS_MEMBER(wxBORDER)
  77
  78     // standard window styles
  79     wxFLAGS_MEMBER(wxTAB_TRAVERSAL)
  80     wxFLAGS_MEMBER(wxCLIP_CHILDREN)
  81     wxFLAGS_MEMBER(wxTRANSPARENT_WINDOW)
  82     wxFLAGS_MEMBER(wxWANTS_CHARS)
  83     wxFLAGS_MEMBER(wxFULL_REPAINT_ON_RESIZE)
  84     wxFLAGS_MEMBER(wxALWAYS_SHOW_SB )
  85     wxFLAGS_MEMBER(wxVSCROLL)
  86     wxFLAGS_MEMBER(wxHSCROLL)
  87
  88     wxFLAGS_MEMBER(wxCB_SIMPLE)
  89     wxFLAGS_MEMBER(wxCB_SORT)
  90     wxFLAGS_MEMBER(wxCB_READONLY)
  91     wxFLAGS_MEMBER(wxCB_DROPDOWN)
  92
  93 wxEND_FLAGS( wxComboBoxStyle )
  94
  95 IMPLEMENT_DYNAMIC_CLASS_XTI(wxComboBox, wxChoice,"wx/combobox.h")
  96
  97 wxBEGIN_PROPERTIES_TABLE(wxComboBox)
  98     wxEVENT_PROPERTY( Select , wxEVT_COMMAND_COMBOBOX_SELECTED , wxCommandEvent )
  99     wxEVENT_PROPERTY( TextEnter , wxEVT_COMMAND_TEXT_ENTER , wxCommandEvent )
 100
 101     // TODO DELEGATES
 102     wxPROPERTY( Font , wxFont , SetFont , GetFont  , EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
 103     wxPROPERTY_COLLECTION( Choices , wxArrayString , wxString , AppendString , GetStrings , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
 104     wxPROPERTY( Value ,wxString, SetValue, GetValue, EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
 105     wxPROPERTY( Selection ,int, SetSelection, GetSelection, EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
 106     wxPROPERTY_FLAGS( WindowStyle , wxComboBoxStyle , long , SetWindowStyleFlag , GetWindowStyleFlag , EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group")) // style
 107 wxEND_PROPERTIES_TABLE()
 108
 109 wxBEGIN_HANDLERS_TABLE(wxComboBox)
 110 wxEND_HANDLERS_TABLE()
 111
 112 wxCONSTRUCTOR_5( wxComboBox , wxWindow* , Parent , wxWindowID , Id , wxString , Value , wxPoint , Position , wxSize , Size )
 113
 114 #else
 115
 116 IMPLEMENT_DYNAMIC_CLASS(wxComboBox, wxChoice)
 117
 118 #endif
 119
 120 BEGIN_EVENT_TABLE(wxComboBox, wxControl)
 121     EVT_MENU(wxID_CUT, wxComboBox::OnCut)
 122     EVT_MENU(wxID_COPY, wxComboBox::OnCopy)
 123     EVT_MENU(wxID_PASTE, wxComboBox::OnPaste)
 124     EVT_MENU(wxID_UNDO, wxComboBox::OnUndo)
 125     EVT_MENU(wxID_REDO, wxComboBox::OnRedo)
 126     EVT_MENU(wxID_CLEAR, wxComboBox::OnDelete)
 127     EVT_MENU(wxID_SELECTALL, wxComboBox::OnSelectAll)
 128
 129     EVT_UPDATE_UI(wxID_CUT, wxComboBox::OnUpdateCut)
 130     EVT_UPDATE_UI(wxID_COPY, wxComboBox::OnUpdateCopy)
 131     EVT_UPDATE_UI(wxID_PASTE, wxComboBox::OnUpdatePaste)
 132     EVT_UPDATE_UI(wxID_UNDO, wxComboBox::OnUpdateUndo)
 133     EVT_UPDATE_UI(wxID_REDO, wxComboBox::OnUpdateRedo)
 134     EVT_UPDATE_UI(wxID_CLEAR, wxComboBox::OnUpdateDelete)
 135     EVT_UPDATE_UI(wxID_SELECTALL, wxComboBox::OnUpdateSelectAll)
 136 END_EVENT_TABLE()
 137
 138 // ----------------------------------------------------------------------------
 139 // function prototypes
 140 // ----------------------------------------------------------------------------
 141
 142 LRESULT APIENTRY _EXPORT wxComboEditWndProc(HWND hWnd,
 143                                             UINT message,
 144                                             WPARAM wParam,
 145                                             LPARAM lParam);
 146
 147 // ---------------------------------------------------------------------------
 148 // global vars
 149 // ---------------------------------------------------------------------------
 150
 151 // the pointer to standard radio button wnd proc
 152 static WNDPROC gs_wndprocEdit = (WNDPROC)NULL;
 153
 154 // ============================================================================
 155 // implementation
 156 // ============================================================================
 157
 158 // ----------------------------------------------------------------------------
 159 // wnd proc for subclassed edit control
 160 // ----------------------------------------------------------------------------
 161
 162 LRESULT APIENTRY _EXPORT wxComboEditWndProc(HWND hWnd,
 163                                             UINT message,
 164                                             WPARAM wParam,
 165                                             LPARAM lParam)
 166 {
 167     HWND hwndCombo = ::GetParent(hWnd);
 168     wxWindow *win = wxFindWinFromHandle((WXHWND)hwndCombo);
 169
 170     switch ( message )
 171     {
 172         // forward some messages to the combobox to generate the appropriate
 173         // wxEvents from them
 174         case WM_KEYUP:
 175         case WM_KEYDOWN:
 176         case WM_CHAR:
 177         case WM_SYSCHAR:
 178         case WM_SYSKEYDOWN:
 179         case WM_SYSKEYUP:
 180         case WM_SETFOCUS:
 181         case WM_KILLFOCUS:
 182             {
 183                 wxComboBox *combo = wxDynamicCast(win, wxComboBox);
 184                 if ( !combo )
 185                 {
 186                     // we can get WM_KILLFOCUS while our parent is already half
 187                     // destroyed and hence doesn't look like a combobx any
 188                     // longer, check for it to avoid bogus assert failures
 189                     if ( !win->IsBeingDeleted() )
 190                     {
 191                         wxFAIL_MSG( wxT("should have combo as parent") );
 192                     }
 193                 }
 194                 else if ( combo->MSWProcessEditMsg(message, wParam, lParam) )
 195                 {
 196                     // handled by parent
 197                     return 0;
 198                 }
 199             }
 200             break;
 201
 202         case WM_GETDLGCODE:
 203             {
 204                 wxCHECK_MSG( win, 0, wxT("should have a parent") );
 205
 206                 if ( win->GetWindowStyle() & wxTE_PROCESS_ENTER )
 207                 {
 208                     // need to return a custom dlg code or we'll never get it
 209                     return DLGC_WANTMESSAGE;
 210                 }
 211             }
 212             break;
 213     }
 214
 215     return ::CallWindowProc(CASTWNDPROC gs_wndprocEdit, hWnd, message, wParam, lParam);
 216 }
 217
 218 // ----------------------------------------------------------------------------
 219 // wxComboBox callbacks
 220 // ----------------------------------------------------------------------------
 221
 222 WXLRESULT wxComboBox::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam)
 223 {
 224     // TODO: handle WM_CTLCOLOR messages from our EDIT control to be able to
 225     //       set its colour correctly (to be the same as our own one)
 226
 227     switch ( nMsg )
 228     {
 229         case WM_SIZE:
 230         // wxStaticBox can generate this message, when modifying the control's style.
 231         // This causes the content of the combobox to be selected, for some reason.
 232         case WM_STYLECHANGED:
 233             {
 234                 // combobox selection sometimes spontaneously changes when its
 235                 // size changes, restore it to the old value if necessary
 236                 if ( !GetEditHWNDIfAvailable() )
 237                     break;
 238
 239                 long fromOld, toOld;
 240                 GetSelection(&fromOld, &toOld);
 241
 242                 // if an editable combobox has a not empty text not from the
 243                 // list, it tries to autocomplete it from the list when it is
 244                 // resized, but we don't want this to happen as it doesn't seem
 245                 // to make any sense, so we forcefully restore the old text
 246                 wxString textOld;
 247                 if ( !HasFlag(wxCB_READONLY) && GetCurrentSelection() == -1 )
 248                     textOld = GetValue();
 249
 250                 // eliminate flickering during following hacks
 251                 wxWindowUpdateLocker lock(this);
 252
 253                 WXLRESULT result = wxChoice::MSWWindowProc(nMsg, wParam, lParam);
 254
 255                 if ( !textOld.empty() && GetValue() != textOld )
 256                     SetLabel(textOld);
 257
 258                 long fromNew, toNew;
 259                 GetSelection(&fromNew, &toNew);
 260
 261                 if ( fromOld != fromNew || toOld != toNew )
 262                 {
 263                     SetSelection(fromOld, toOld);
 264                 }
 265
 266                 return result;
 267             }
 268     }
 269
 270     return wxChoice::MSWWindowProc(nMsg, wParam, lParam);
 271 }
 272
 273 bool wxComboBox::MSWProcessEditMsg(WXUINT msg, WXWPARAM wParam, WXLPARAM lParam)
 274 {
 275     switch ( msg )
 276     {
 277         case WM_CHAR:
 278             // for compatibility with wxTextCtrl, generate a special message
 279             // when Enter is pressed
 280             if ( wParam == VK_RETURN )
 281             {
 282                 if (SendMessage(GetHwnd(), CB_GETDROPPEDSTATE, 0, 0))
 283                     return false;
 284
 285                 wxCommandEvent event(wxEVT_COMMAND_TEXT_ENTER, m_windowId);
 286
 287                 const int sel = GetSelection();
 288                 event.SetInt(sel);
 289                 event.SetString(GetValue());
 290                 InitCommandEventWithItems(event, sel);
 291
 292                 if ( ProcessCommand(event) )
 293                 {
 294                     // don't let the event through to the native control
 295                     // because it doesn't need it and may generate an annoying
 296                     // beep if it gets it
 297                     return true;
 298                 }
 299             }
 300             // fall through
 301
 302         case WM_SYSCHAR:
 303             return HandleChar(wParam, lParam, true /* isASCII */);
 304
 305         case WM_SYSKEYDOWN:
 306         case WM_KEYDOWN:
 307             return HandleKeyDown(wParam, lParam);
 308
 309         case WM_SYSKEYUP:
 310         case WM_KEYUP:
 311             return HandleKeyUp(wParam, lParam);
 312
 313         case WM_SETFOCUS:
 314             return HandleSetFocus((WXHWND)wParam);
 315
 316         case WM_KILLFOCUS:
 317             return HandleKillFocus((WXHWND)wParam);
 318
 319         case WM_CUT:
 320         case WM_COPY:
 321         case WM_PASTE:
 322             return HandleClipboardEvent(msg);
 323     }
 324
 325     return false;
 326 }
 327
 328 bool wxComboBox::MSWCommand(WXUINT param, WXWORD id)
 329 {
 330     int sel = -1;
 331     wxString value;
 332
 333     switch ( param )
 334     {
 335         case CBN_DROPDOWN:
 336             // remember the last selection, just as wxChoice does
 337             m_lastAcceptedSelection = GetCurrentSelection();
 338             if ( m_lastAcceptedSelection == -1 )
 339             {
 340                 // but unlike with wxChoice we may have no selection but still
 341                 // have some text and we should avoid erasing it if the drop
 342                 // down is cancelled (see #8474)
 343                 m_lastAcceptedSelection = wxID_NONE;
 344             }
 345             {
 346                 wxCommandEvent event(wxEVT_COMMAND_COMBOBOX_DROPDOWN, GetId());
 347                 event.SetEventObject(this);
 348                 ProcessCommand(event);
 349             }
 350             break;
 351         case CBN_CLOSEUP:
 352             {
 353                 wxCommandEvent event(wxEVT_COMMAND_COMBOBOX_CLOSEUP, GetId());
 354                 event.SetEventObject(this);
 355                 ProcessCommand(event);
 356             }
 357             break;
 358         case CBN_SELENDOK:
 359 #ifndef __SMARTPHONE__
 360             // we need to reset this to prevent the selection from being undone
 361             // by wxChoice, see wxChoice::MSWCommand() and comments there
 362             m_lastAcceptedSelection = wxID_NONE;
 363 #endif
 364
 365             // set these variables so that they could be also fixed in
 366             // CBN_EDITCHANGE below
 367             sel = GetSelection();
 368             value = GetStringSelection();
 369
 370             // this string is going to become the new combobox value soon but
 371             // we need it to be done right now, otherwise the event handler
 372             // could get a wrong value when it calls our GetValue()
 373             ::SetWindowText(GetHwnd(), value.wx_str());
 374
 375             {
 376                 wxCommandEvent event(wxEVT_COMMAND_COMBOBOX_SELECTED, GetId());
 377                 event.SetInt(sel);
 378                 event.SetString(value);
 379                 InitCommandEventWithItems(event, sel);
 380
 381                 ProcessCommand(event);
 382             }
 383
 384             // fall through: for compability with wxGTK, also send the text
 385             // update event when the selection changes (this also seems more
 386             // logical as the text does change)
 387
 388         case CBN_EDITCHANGE:
 389             if ( m_allowTextEvents )
 390             {
 391                 wxCommandEvent event(wxEVT_COMMAND_TEXT_UPDATED, GetId());
 392
 393                 // if sel != -1, value was already initialized above
 394                 if ( sel == -1 )
 395                 {
 396                     value = wxGetWindowText(GetHwnd());
 397                 }
 398
 399                 event.SetString(value);
 400                 InitCommandEventWithItems(event, sel);
 401
 402                 ProcessCommand(event);
 403             }
 404             break;
 405
 406         default:
 407             return wxChoice::MSWCommand(param, id);
 408     }
 409
 410     // skip wxChoice version as it would generate its own events for
 411     // CBN_SELENDOK and also interfere with our handling of CBN_DROPDOWN
 412     return true;
 413 }
 414
 415 bool wxComboBox::MSWShouldPreProcessMessage(WXMSG *pMsg)
 416 {
 417     // prevent command accelerators from stealing editing
 418     // hotkeys when we have the focus
 419     if (wxIsCtrlDown())
 420     {
 421         WPARAM vkey = pMsg->wParam;
 422
 423         switch (vkey)
 424         {
 425             case 'C':
 426             case 'V':
 427             case 'X':
 428             case VK_INSERT:
 429             case VK_DELETE:
 430             case VK_HOME:
 431             case VK_END:
 432                 return false;
 433         }
 434     }
 435
 436     return wxChoice::MSWShouldPreProcessMessage(pMsg);
 437 }
 438
 439 WXHWND wxComboBox::GetEditHWNDIfAvailable() const
 440 {
 441 #if defined(WINVER) && WINVER >= 0x0500
 442     typedef BOOL (WINAPI *GetComboBoxInfo_t)(HWND, COMBOBOXINFO*);
 443     static GetComboBoxInfo_t s_pfnGetComboBoxInfo = NULL;
 444     static bool s_triedToLoad = false;
 445     if ( !s_triedToLoad )
 446     {
 447         s_triedToLoad = true;
 448         wxLoadedDLL dllUser32("user32.dll");
 449         wxDL_INIT_FUNC(s_pfn, GetComboBoxInfo, dllUser32);
 450     }
 451
 452     if ( s_pfnGetComboBoxInfo )
 453     {
 454         WinStruct<COMBOBOXINFO> info;
 455         (*s_pfnGetComboBoxInfo)(GetHwnd(), &info);
 456         return info.hwndItem;
 457     }
 458 #endif
 459
 460     if (HasFlag(wxCB_SIMPLE))
 461     {
 462         POINT pt;
 463         pt.x = pt.y = 4;
 464         return (WXHWND) ::ChildWindowFromPoint(GetHwnd(), pt);
 465     }
 466
 467     // notice that a slightly safer alternative could be to use FindWindowEx()
 468     // but it's not available under WinCE so just take the first child for now
 469     // to keep one version of the code for all platforms and fix it later if
 470     // problems are discovered
 471
 472     // we assume that the only child of the combobox is the edit window
 473     return (WXHWND)::GetWindow(GetHwnd(), GW_CHILD);
 474 }
 475
 476 WXHWND wxComboBox::GetEditHWND() const
 477 {
 478     // this function should not be called for wxCB_READONLY controls, it is
 479     // the callers responsibility to check this
 480     wxASSERT_MSG( !HasFlag(wxCB_READONLY),
 481                   wxT("read-only combobox doesn't have any edit control") );
 482
 483     WXHWND hWndEdit = GetEditHWNDIfAvailable();
 484     wxASSERT_MSG( hWndEdit, wxT("combobox without edit control?") );
 485
 486     return hWndEdit;
 487 }
 488
 489 wxWindow *wxComboBox::GetEditableWindow()
 490 {
 491     wxASSERT_MSG( !HasFlag(wxCB_READONLY),
 492                   wxT("read-only combobox doesn't have any edit control") );
 493
 494     return this;
 495 }
 496
 497 // ----------------------------------------------------------------------------
 498 // wxComboBox creation
 499 // ----------------------------------------------------------------------------
 500
 501 bool wxComboBox::Create(wxWindow *parent, wxWindowID id,
 502                         const wxString& value,
 503                         const wxPoint& pos,
 504                         const wxSize& size,
 505                         int n, const wxString choices[],
 506                         long style,
 507                         const wxValidator& validator,
 508                         const wxString& name)
 509 {
 510     // pretend that wxComboBox is hidden while it is positioned and resized and
 511     // show it only right before leaving this method because otherwise there is
 512     // some noticeable flicker while the control rearranges itself
 513     m_isShown = false;
 514
 515     if ( !CreateAndInit(parent, id, pos, size, n, choices, style,
 516                         validator, name) )
 517         return false;
 518
 519     // we shouldn't call SetValue() for an empty string because this would
 520     // (correctly) result in an assert with a read only combobox and is useless
 521     // for the other ones anyhow
 522     if ( !value.empty() )
 523         SetValue(value);
 524
 525     // a (not read only) combobox is, in fact, 2 controls: the combobox itself
 526     // and an edit control inside it and if we want to catch events from this
 527     // edit control, we must subclass it as well
 528     if ( !(style & wxCB_READONLY) )
 529     {
 530         gs_wndprocEdit = wxSetWindowProc((HWND)GetEditHWND(), wxComboEditWndProc);
 531     }
 532
 533     // and finally, show the control
 534     Show(true);
 535
 536     return true;
 537 }
 538
 539 bool wxComboBox::Create(wxWindow *parent, wxWindowID id,
 540                         const wxString& value,
 541                         const wxPoint& pos,
 542                         const wxSize& size,
 543                         const wxArrayString& choices,
 544                         long style,
 545                         const wxValidator& validator,
 546                         const wxString& name)
 547 {
 548     wxCArrayString chs(choices);
 549     return Create(parent, id, value, pos, size, chs.GetCount(),
 550                   chs.GetStrings(), style, validator, name);
 551 }
 552
 553 WXDWORD wxComboBox::MSWGetStyle(long style, WXDWORD *exstyle) const
 554 {
 555     // we never have an external border
 556     WXDWORD msStyle = wxChoice::MSWGetStyle
 557                       (
 558                         (style & ~wxBORDER_MASK) | wxBORDER_NONE, exstyle
 559                       );
 560
 561     // usually WS_TABSTOP is added by wxControl::MSWGetStyle() but as we're
 562     // created hidden (see Create() above), it is not done for us but we still
 563     // want to have this style
 564     msStyle |= WS_TABSTOP;
 565
 566     // remove the style always added by wxChoice
 567     msStyle &= ~CBS_DROPDOWNLIST;
 568
 569     if ( style & wxCB_READONLY )
 570         msStyle |= CBS_DROPDOWNLIST;
 571 #ifndef __WXWINCE__
 572     else if ( style & wxCB_SIMPLE )
 573         msStyle |= CBS_SIMPLE; // A list (shown always) and edit control
 574 #endif
 575     else
 576         msStyle |= CBS_DROPDOWN;
 577
 578     // there is no reason to not always use CBS_AUTOHSCROLL, so do use it
 579     msStyle |= CBS_AUTOHSCROLL;
 580
 581     // NB: we used to also add CBS_NOINTEGRALHEIGHT here but why?
 582
 583     return msStyle;
 584 }
 585
 586 // ----------------------------------------------------------------------------
 587 // wxComboBox text control-like methods
 588 // ----------------------------------------------------------------------------
 589
 590 wxString wxComboBox::GetValue() const
 591 {
 592     return HasFlag(wxCB_READONLY) ? GetStringSelection()
 593                                   : wxTextEntry::GetValue();
 594 }
 595
 596 void wxComboBox::SetValue(const wxString& value)
 597 {
 598     if ( HasFlag(wxCB_READONLY) )
 599         SetStringSelection(value);
 600     else
 601         wxTextEntry::SetValue(value);
 602 }
 603
 604 void wxComboBox::Clear()
 605 {
 606     wxChoice::Clear();
 607     if ( !HasFlag(wxCB_READONLY) )
 608         wxTextEntry::Clear();
 609 }
 610
 611 void wxComboBox::GetSelection(long *from, long *to) const
 612 {
 613     if ( !HasFlag(wxCB_READONLY) )
 614     {
 615         wxTextEntry::GetSelection(from, to);
 616     }
 617     else // text selection doesn't make sense for read only comboboxes
 618     {
 619         if ( from )
 620             *from = -1;
 621         if ( to )
 622             *to = -1;
 623     }
 624 }
 625
 626 bool wxComboBox::IsEditable() const
 627 {
 628     return !HasFlag(wxCB_READONLY) && wxTextEntry::IsEditable();
 629 }
 630
 631 // ----------------------------------------------------------------------------
 632 // standard event handling
 633 // ----------------------------------------------------------------------------
 634
 635 void wxComboBox::OnCut(wxCommandEvent& WXUNUSED(event))
 636 {
 637     Cut();
 638 }
 639
 640 void wxComboBox::OnCopy(wxCommandEvent& WXUNUSED(event))
 641 {
 642     Copy();
 643 }
 644
 645 void wxComboBox::OnPaste(wxCommandEvent& WXUNUSED(event))
 646 {
 647     Paste();
 648 }
 649
 650 void wxComboBox::OnUndo(wxCommandEvent& WXUNUSED(event))
 651 {
 652     Undo();
 653 }
 654
 655 void wxComboBox::OnRedo(wxCommandEvent& WXUNUSED(event))
 656 {
 657     Redo();
 658 }
 659
 660 void wxComboBox::OnDelete(wxCommandEvent& WXUNUSED(event))
 661 {
 662     RemoveSelection();
 663 }
 664
 665 void wxComboBox::OnSelectAll(wxCommandEvent& WXUNUSED(event))
 666 {
 667     SelectAll();
 668 }
 669
 670 void wxComboBox::OnUpdateCut(wxUpdateUIEvent& event)
 671 {
 672     event.Enable( CanCut() );
 673 }
 674
 675 void wxComboBox::OnUpdateCopy(wxUpdateUIEvent& event)
 676 {
 677     event.Enable( CanCopy() );
 678 }
 679
 680 void wxComboBox::OnUpdatePaste(wxUpdateUIEvent& event)
 681 {
 682     event.Enable( CanPaste() );
 683 }
 684
 685 void wxComboBox::OnUpdateUndo(wxUpdateUIEvent& event)
 686 {
 687     event.Enable( IsEditable() && CanUndo() );
 688 }
 689
 690 void wxComboBox::OnUpdateRedo(wxUpdateUIEvent& event)
 691 {
 692     event.Enable( IsEditable() && CanRedo() );
 693 }
 694
 695 void wxComboBox::OnUpdateDelete(wxUpdateUIEvent& event)
 696 {
 697     event.Enable(IsEditable() && HasSelection());
 698 }
 699
 700 void wxComboBox::OnUpdateSelectAll(wxUpdateUIEvent& event)
 701 {
 702     event.Enable(IsEditable() && !wxTextEntry::IsEmpty());
 703 }
 704
 705 void wxComboBox::MSWDoPopupOrDismiss(bool show)
 706 {
 707     wxASSERT_MSG( !HasFlag(wxCB_SIMPLE),
 708                   wxT("can't popup/dismiss the list for simple combo box") );
 709
 710     // we *must* set focus to the combobox before showing or hiding the drop
 711     // down as without this we get WM_LBUTTONDOWN messages with invalid HWND
 712     // when hiding it (whether programmatically or manually) resulting in a
 713     // crash when we pass them to IsDialogMessage()
 714     //
 715     // this can be seen in the combo page of the widgets sample under Windows 7
 716     SetFocus();
 717
 718     ::SendMessage(GetHwnd(), CB_SHOWDROPDOWN, show, 0);
 719 }
 720
 721 #if wxUSE_TOOLTIPS
 722
 723 void wxComboBox::DoSetToolTip(wxToolTip *tip)
 724 {
 725     wxChoice::DoSetToolTip(tip);
 726
 727     if ( tip && !HasFlag(wxCB_READONLY) )
 728         tip->Add(GetEditHWND());
 729 }
 730
 731 #endif // wxUSE_TOOLTIPS
 732
 733 #if wxUSE_UXTHEME
 734
 735 bool wxComboBox::SetHint(const wxString& hintOrig)
 736 {
 737     wxString hint(hintOrig);
 738     if ( wxUxThemeEngine::GetIfActive() )
 739     {
 740         // under XP (but not Vista) there is a bug in cue banners
 741         // implementation for combobox edit control: the first character is
 742         // partially chopped off, so prepend a space to make it fully visible
 743         hint.insert(0, " ");
 744     }
 745
 746     return wxTextEntry::SetHint(hint);
 747 }
 748
 749 #endif // wxUSE_UXTHEME
 750
 751 #endif // wxUSE_COMBOBOX