src/msw/combobox.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        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 #ifndef WX_PRECOMP
  30     #include "wx/settings.h"
  31     #include "wx/log.h"
  32     // for wxEVT_COMMAND_TEXT_ENTER
  33     #include "wx/textctrl.h"
  34 #endif
  35
  36 #include "wx/app.h"
  37 #include "wx/combobox.h"
  38 #include "wx/brush.h"
  39 #include "wx/clipbrd.h"
  40 #include "wx/msw/private.h"
  41
  42 #if wxUSE_TOOLTIPS
  43     #if !defined(__GNUWIN32_OLD__) || defined(__CYGWIN10__)
  44         #include <commctrl.h>
  45     #endif
  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, wxControl,"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, wxControl)
 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() & wxPROCESS_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         // deal with tooltips here
 211 #if wxUSE_TOOLTIPS && defined(TTN_NEEDTEXT)
 212         case WM_NOTIFY:
 213             {
 214                 wxCHECK_MSG( win, 0, _T("should have a parent") );
 215
 216                 NMHDR* hdr = (NMHDR *)lParam;
 217                 if ( hdr->code == TTN_NEEDTEXT )
 218                 {
 219                     wxToolTip *tooltip = win->GetToolTip();
 220                     if ( tooltip )
 221                     {
 222                         TOOLTIPTEXT *ttt = (TOOLTIPTEXT *)lParam;
 223                         ttt->lpszText = (wxChar *)tooltip->GetTip().c_str();
 224                     }
 225
 226                     // processed
 227                     return 0;
 228                 }
 229             }
 230             break;
 231 #endif // wxUSE_TOOLTIPS
 232     }
 233
 234     return ::CallWindowProc(CASTWNDPROC gs_wndprocEdit, hWnd, message, wParam, lParam);
 235 }
 236
 237 // ----------------------------------------------------------------------------
 238 // wxComboBox callbacks
 239 // ----------------------------------------------------------------------------
 240
 241 WXLRESULT wxComboBox::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam)
 242 {
 243     // TODO: handle WM_CTLCOLOR messages from our EDIT control to be able to
 244     //       set its colour correctly (to be the same as our own one)
 245
 246     switch ( nMsg )
 247     {
 248         case CB_SETCURSEL:
 249             // Selection was set with SetSelection.  Update the value too.
 250             if ((int)wParam > GetCount())
 251                 m_value.clear();
 252             else
 253                 m_value = GetString(wParam);
 254             m_selectionOld = -1;
 255             break;
 256
 257         case WM_SIZE:
 258         // wxStaticBox can generate this message, when modifying the control's style.
 259         // This causes the content of the combobox to be selected, for some reason.
 260         case WM_STYLECHANGED:
 261             {
 262                 // combobox selection sometimes spontaneously changes when its
 263                 // size changes, restore it to the old value if necessary
 264                 long fromOld, toOld;
 265                 GetSelection(&fromOld, &toOld);
 266                 WXLRESULT result = wxChoice::MSWWindowProc(nMsg, wParam, lParam);
 267
 268                 long fromNew, toNew;
 269                 GetSelection(&fromNew, &toNew);
 270
 271                 if ( fromOld != fromNew || toOld != toNew )
 272                 {
 273                     SetSelection(fromOld, toOld);
 274                 }
 275
 276                 return result;
 277             }
 278     }
 279
 280     return wxChoice::MSWWindowProc(nMsg, wParam, lParam);
 281 }
 282
 283 bool wxComboBox::MSWProcessEditMsg(WXUINT msg, WXWPARAM wParam, WXLPARAM lParam)
 284 {
 285     switch ( msg )
 286     {
 287         case WM_CHAR:
 288             // for compatibility with wxTextCtrl, generate a special message
 289             // when Enter is pressed
 290             if ( wParam == VK_RETURN )
 291             {
 292                 wxCommandEvent event(wxEVT_COMMAND_TEXT_ENTER, m_windowId);
 293                 InitCommandEvent(event);
 294                 event.SetString(GetValue());
 295                 event.SetInt(GetSelection());
 296                 if ( ProcessCommand(event) )
 297                 {
 298                     // don't let the event through to the native control
 299                     // because it doesn't need it and may generate an annoying
 300                     // beep if it gets it
 301                     return true;
 302                 }
 303             }
 304             // fall through
 305
 306         case WM_SYSCHAR:
 307             return HandleChar(wParam, lParam, true /* isASCII */);
 308
 309         case WM_SYSKEYDOWN:
 310         case WM_KEYDOWN:
 311             return HandleKeyDown(wParam, lParam);
 312
 313         case WM_SYSKEYUP:
 314         case WM_KEYUP:
 315             return HandleKeyUp(wParam, lParam);
 316
 317         case WM_SETFOCUS:
 318             return HandleSetFocus((WXHWND)wParam);
 319
 320         case WM_KILLFOCUS:
 321             return HandleKillFocus((WXHWND)wParam);
 322     }
 323
 324     return false;
 325 }
 326
 327 bool wxComboBox::MSWCommand(WXUINT param, WXWORD id)
 328 {
 329     wxString value;
 330     int sel = -1;
 331     switch ( param )
 332     {
 333         case CBN_SELENDOK:
 334         case CBN_SELCHANGE:
 335             sel = GetSelection();
 336
 337             // we may sometimes get 2 CBN_SELCHANGE events or a CBN_SELENDOK
 338             // before CBN_SELCHANGE with the same index when the user selects
 339             // an item in the combobox -- ignore duplicates
 340             if ( sel > -1 && sel != m_selectionOld )
 341             {
 342                 m_selectionOld = sel;
 343
 344                 // GetValue() would still return the old value from here but
 345                 // according to the docs we should return the new value if the
 346                 // user calls it in his event handler, so update internal
 347                 // m_value
 348                 m_value = GetString(sel);
 349
 350                 wxCommandEvent event(wxEVT_COMMAND_COMBOBOX_SELECTED, GetId());
 351                 event.SetInt(sel);
 352                 event.SetEventObject(this);
 353                 event.SetString(m_value);
 354                 ProcessCommand(event);
 355             }
 356             else // no valid selection
 357             {
 358                 m_selectionOld = sel;
 359
 360                 // hence no EVT_TEXT neither
 361                 break;
 362             }
 363
 364             // fall through: for compability with wxGTK, also send the text
 365             // update event when the selection changes (this also seems more
 366             // logical as the text does change)
 367
 368         case CBN_EDITCHANGE:
 369             {
 370                 wxCommandEvent event(wxEVT_COMMAND_TEXT_UPDATED, GetId());
 371
 372                 // if sel != -1, value was initialized above (and we can't use
 373                 // GetValue() here as it would return the old selection and we
 374                 // want the new one)
 375                 if ( sel == -1 )
 376                 {
 377                     m_value = wxGetWindowText(GetHwnd());
 378                     m_selectionOld = -1;
 379                 }
 380                 else // we're synthesizing text updated event from sel change
 381                 {
 382                     // We need to retrieve the current selection because the
 383                     // user may have changed it in the previous handler (for
 384                     // CBN_SELCHANGE above).
 385                     sel = GetSelection();
 386                     if ( sel > -1 )
 387                     {
 388                         m_value = GetString(sel);
 389                     }
 390                 }
 391
 392                 event.SetString(m_value);
 393                 event.SetEventObject(this);
 394                 ProcessCommand(event);
 395             }
 396             break;
 397
 398         default:
 399             return wxChoice::MSWCommand(param, id);
 400     }
 401
 402     // let the def window proc have it by returning false, but do not pass the
 403     // message we've already handled here (notably CBN_SELCHANGE) to the base
 404     // class as it would generate another event for them
 405     return false;
 406 }
 407
 408 WXHWND wxComboBox::GetEditHWND() const
 409 {
 410     // this function should not be called for wxCB_READONLY controls, it is
 411     // the callers responsability to check this
 412     wxASSERT_MSG( !(GetWindowStyle() & wxCB_READONLY),
 413                   _T("read-only combobox doesn't have any edit control") );
 414
 415     POINT pt;
 416     pt.x = pt.y = 4;
 417     HWND hwndEdit = ::ChildWindowFromPoint(GetHwnd(), pt);
 418     if ( !hwndEdit || hwndEdit == GetHwnd() )
 419     {
 420         wxFAIL_MSG(_T("not read only combobox without edit control?"));
 421     }
 422
 423     return (WXHWND)hwndEdit;
 424 }
 425
 426 // ----------------------------------------------------------------------------
 427 // wxComboBox creation
 428 // ----------------------------------------------------------------------------
 429
 430 bool wxComboBox::Create(wxWindow *parent, wxWindowID id,
 431                         const wxString& value,
 432                         const wxPoint& pos,
 433                         const wxSize& size,
 434                         int n, const wxString choices[],
 435                         long style,
 436                         const wxValidator& validator,
 437                         const wxString& name)
 438 {
 439     // pretend that wxComboBox is hidden while it is positioned and resized and
 440     // show it only right before leaving this method because otherwise there is
 441     // some noticeable flicker while the control rearranges itself
 442     m_isShown = false;
 443
 444     if ( !CreateAndInit(parent, id, pos, size, n, choices, style,
 445                         validator, name) )
 446         return false;
 447
 448     // we shouldn't call SetValue() for an empty string because this would
 449     // (correctly) result in an assert with a read only combobox and is useless
 450     // for the other ones anyhow
 451     if ( !value.empty() )
 452         SetValue(value);
 453
 454     // a (not read only) combobox is, in fact, 2 controls: the combobox itself
 455     // and an edit control inside it and if we want to catch events from this
 456     // edit control, we must subclass it as well
 457     if ( !(style & wxCB_READONLY) )
 458     {
 459         gs_wndprocEdit = wxSetWindowProc((HWND)GetEditHWND(),
 460                                          wxComboEditWndProc);
 461     }
 462
 463     // and finally, show the control
 464     Show(true);
 465
 466     return true;
 467 }
 468
 469 bool wxComboBox::Create(wxWindow *parent, wxWindowID id,
 470                         const wxString& value,
 471                         const wxPoint& pos,
 472                         const wxSize& size,
 473                         const wxArrayString& choices,
 474                         long style,
 475                         const wxValidator& validator,
 476                         const wxString& name)
 477 {
 478     wxCArrayString chs(choices);
 479     return Create(parent, id, value, pos, size, chs.GetCount(),
 480                   chs.GetStrings(), style, validator, name);
 481 }
 482
 483 WXDWORD wxComboBox::MSWGetStyle(long style, WXDWORD *exstyle) const
 484 {
 485     // we never have an external border
 486     WXDWORD msStyle = wxChoice::MSWGetStyle
 487                       (
 488                         (style & ~wxBORDER_MASK) | wxBORDER_NONE, exstyle
 489                       );
 490
 491     // usually WS_TABSTOP is added by wxControl::MSWGetStyle() but as we're
 492     // created hidden (see Create() above), it is not done for us but we still
 493     // want to have this style
 494     msStyle |= WS_TABSTOP;
 495
 496     // remove the style always added by wxChoice
 497     msStyle &= ~CBS_DROPDOWNLIST;
 498
 499     if ( style & wxCB_READONLY )
 500         msStyle |= CBS_DROPDOWNLIST;
 501 #ifndef __WXWINCE__
 502     else if ( style & wxCB_SIMPLE )
 503         msStyle |= CBS_SIMPLE; // A list (shown always) and edit control
 504 #endif
 505     else
 506         msStyle |= CBS_DROPDOWN;
 507
 508     // there is no reason to not always use CBS_AUTOHSCROLL, so do use it
 509     msStyle |= CBS_AUTOHSCROLL;
 510
 511     // NB: we used to also add CBS_NOINTEGRALHEIGHT here but why?
 512
 513     return msStyle;
 514 }
 515
 516 // ----------------------------------------------------------------------------
 517 // wxComboBox text control-like methods
 518 // ----------------------------------------------------------------------------
 519
 520 void wxComboBox::SetValue(const wxString& value)
 521 {
 522     if ( HasFlag(wxCB_READONLY) )
 523         SetStringSelection(value);
 524     else
 525         SetWindowText(GetHwnd(), value.c_str());
 526
 527     m_value = value;
 528     m_selectionOld = GetSelection();
 529 }
 530
 531 // Clipboard operations
 532 void wxComboBox::Copy()
 533 {
 534     SendMessage(GetHwnd(), WM_COPY, 0, 0L);
 535 }
 536
 537 void wxComboBox::Cut()
 538 {
 539     SendMessage(GetHwnd(), WM_CUT, 0, 0L);
 540 }
 541
 542 void wxComboBox::Paste()
 543 {
 544     SendMessage(GetHwnd(), WM_PASTE, 0, 0L);
 545 }
 546
 547 void wxComboBox::Undo()
 548 {
 549     if (CanUndo())
 550     {
 551         HWND hEditWnd = (HWND) GetEditHWND() ;
 552         if ( hEditWnd )
 553             ::SendMessage(hEditWnd, EM_UNDO, 0, 0);
 554     }
 555 }
 556
 557 void wxComboBox::Redo()
 558 {
 559     if (CanUndo())
 560     {
 561         // Same as Undo, since Undo undoes the undo, i.e. a redo.
 562         HWND hEditWnd = (HWND) GetEditHWND() ;
 563         if ( hEditWnd )
 564             ::SendMessage(hEditWnd, EM_UNDO, 0, 0);
 565     }
 566 }
 567
 568 void wxComboBox::SelectAll()
 569 {
 570     SetSelection(0, GetLastPosition());
 571 }
 572
 573 bool wxComboBox::CanUndo() const
 574 {
 575     if (!IsEditable())
 576         return false;
 577
 578     HWND hEditWnd = (HWND) GetEditHWND() ;
 579     if ( hEditWnd )
 580         return ::SendMessage(hEditWnd, EM_CANUNDO, 0, 0) != 0;
 581     else
 582         return false;
 583 }
 584
 585 bool wxComboBox::CanRedo() const
 586 {
 587     if (!IsEditable())
 588         return false;
 589
 590     HWND hEditWnd = (HWND) GetEditHWND() ;
 591     if ( hEditWnd )
 592         return ::SendMessage(hEditWnd, EM_CANUNDO, 0, 0) != 0;
 593     else
 594         return false;
 595 }
 596
 597 bool wxComboBox::HasSelection() const
 598 {
 599     long from, to;
 600     GetSelection(&from, &to);
 601     return from != to;
 602 }
 603
 604 bool wxComboBox::CanCopy() const
 605 {
 606     // Can copy if there's a selection
 607     return HasSelection();
 608 }
 609
 610 bool wxComboBox::CanCut() const
 611 {
 612     return IsEditable() && CanCopy() ;
 613 }
 614
 615 bool wxComboBox::CanPaste() const
 616 {
 617     if ( !IsEditable() )
 618         return false;
 619
 620     // Standard edit control: check for straight text on clipboard
 621     if ( !::OpenClipboard(GetHwndOf(wxTheApp->GetTopWindow())) )
 622         return false;
 623
 624     bool isTextAvailable = ::IsClipboardFormatAvailable(CF_TEXT) != 0;
 625     ::CloseClipboard();
 626
 627     return isTextAvailable;
 628 }
 629
 630 bool wxComboBox::IsEditable() const
 631 {
 632     return !HasFlag(wxCB_READONLY);
 633 }
 634
 635 void wxComboBox::SetEditable(bool WXUNUSED(editable))
 636 {
 637   // Can't implement in MSW?
 638 //  HWND hWnd = GetHwnd();
 639 //  SendMessage(hWnd, EM_SETREADONLY, (WPARAM)!editable, (LPARAM)0L);
 640 }
 641
 642 void wxComboBox::SetInsertionPoint(long pos)
 643 {
 644     if ( GetWindowStyle() & wxCB_READONLY )
 645         return;
 646
 647 #ifdef __WIN32__
 648     HWND hWnd = GetHwnd();
 649     ::SendMessage(hWnd, CB_SETEDITSEL, 0, MAKELPARAM(pos, pos));
 650     HWND hEditWnd = (HWND) GetEditHWND() ;
 651     if ( hEditWnd )
 652     {
 653         // Scroll insertion point into view
 654         SendMessage(hEditWnd, EM_SCROLLCARET, (WPARAM)0, (LPARAM)0);
 655         // Why is this necessary? (Copied from wxTextCtrl::SetInsertionPoint)
 656         SendMessage(hEditWnd, EM_REPLACESEL, 0, (LPARAM) wxEmptyString);
 657     }
 658 #endif // __WIN32__
 659 }
 660
 661 void wxComboBox::SetInsertionPointEnd()
 662 {
 663     // setting insertion point doesn't make sense for read only comboboxes
 664     if ( !(GetWindowStyle() & wxCB_READONLY) )
 665     {
 666         wxTextPos pos = GetLastPosition();
 667         SetInsertionPoint(pos);
 668     }
 669 }
 670
 671 long wxComboBox::GetInsertionPoint() const
 672 {
 673     // CB_GETEDITSEL returns the index of the first character of the selection in
 674     // its low-order word
 675     DWORD pos= (DWORD)::SendMessage(GetHwnd(), CB_GETEDITSEL, 0, 0L);
 676     return LOWORD(pos);
 677 }
 678
 679 wxTextPos wxComboBox::GetLastPosition() const
 680 {
 681     HWND hEditWnd = (HWND) GetEditHWND();
 682
 683     // Get number of characters in the last (only) line. We'll add this to the character
 684     // index for the last line, 1st position.
 685     wxTextPos lineLength = (wxTextPos)SendMessage(hEditWnd, EM_LINELENGTH, (WPARAM) 0, (LPARAM)0L);
 686
 687     return lineLength;
 688 }
 689
 690 void wxComboBox::Replace(long from, long to, const wxString& value)
 691 {
 692 #if wxUSE_CLIPBOARD
 693     Remove(from, to);
 694
 695     // Now replace with 'value', by pasting.
 696     wxSetClipboardData(wxDF_TEXT, (wxObject *)(const wxChar *)value, 0, 0);
 697
 698     // Paste into edit control
 699     SendMessage(GetHwnd(), WM_PASTE, (WPARAM)0, (LPARAM)0L);
 700 #else
 701     wxUnusedVar(from);
 702     wxUnusedVar(to);
 703     wxUnusedVar(value);
 704 #endif
 705 }
 706
 707 void wxComboBox::Remove(long from, long to)
 708 {
 709     // Set selection and remove it
 710     SetSelection(from, to);
 711     SendMessage(GetHwnd(), WM_CUT, (WPARAM)0, (LPARAM)0);
 712 }
 713
 714 void wxComboBox::SetSelection(long from, long to)
 715 {
 716     // if from and to are both -1, it means (in wxWidgets) that all text should
 717     // be selected, translate this into Windows convention
 718     if ( (from == -1) && (to == -1) )
 719     {
 720         from = 0;
 721     }
 722
 723     if ( SendMessage(GetHwnd(), CB_SETEDITSEL,
 724                      0, (LPARAM)MAKELONG(from, to)) == CB_ERR )
 725     {
 726         wxLogDebug(_T("CB_SETEDITSEL failed"));
 727     }
 728 }
 729
 730 void wxComboBox::GetSelection(long* from, long* to) const
 731 {
 732     DWORD dwStart, dwEnd;
 733     if ( ::SendMessage(GetHwnd(), CB_GETEDITSEL,
 734                        (WPARAM)&dwStart, (LPARAM)&dwEnd) == CB_ERR )
 735     {
 736         *from =
 737         *to = 0;
 738     }
 739     else
 740     {
 741         *from = dwStart;
 742         *to = dwEnd;
 743     }
 744 }
 745
 746 int wxComboBox::GetSelection() const
 747 {
 748     return wxChoice::GetSelection();
 749 }
 750
 751 void wxComboBox::Clear()
 752 {
 753     wxChoice::Clear();
 754     m_selectionOld = -1;
 755     m_value.clear();
 756 }
 757
 758 // ----------------------------------------------------------------------------
 759 // overridden wxChoice methods
 760 // ----------------------------------------------------------------------------
 761
 762 void wxComboBox::SetSelection(int n)
 763 {
 764     wxChoice::SetSelection(n);
 765     m_selectionOld = n;
 766 }
 767
 768 // ----------------------------------------------------------------------------
 769 // standard event handling
 770 // ----------------------------------------------------------------------------
 771
 772 void wxComboBox::OnCut(wxCommandEvent& WXUNUSED(event))
 773 {
 774     Cut();
 775 }
 776
 777 void wxComboBox::OnCopy(wxCommandEvent& WXUNUSED(event))
 778 {
 779     Copy();
 780 }
 781
 782 void wxComboBox::OnPaste(wxCommandEvent& WXUNUSED(event))
 783 {
 784     Paste();
 785 }
 786
 787 void wxComboBox::OnUndo(wxCommandEvent& WXUNUSED(event))
 788 {
 789     Undo();
 790 }
 791
 792 void wxComboBox::OnRedo(wxCommandEvent& WXUNUSED(event))
 793 {
 794     Redo();
 795 }
 796
 797 void wxComboBox::OnDelete(wxCommandEvent& WXUNUSED(event))
 798 {
 799     long from, to;
 800     GetSelection(& from, & to);
 801     if (from != -1 && to != -1)
 802         Remove(from, to);
 803 }
 804
 805 void wxComboBox::OnSelectAll(wxCommandEvent& WXUNUSED(event))
 806 {
 807     SetSelection(-1, -1);
 808 }
 809
 810 void wxComboBox::OnUpdateCut(wxUpdateUIEvent& event)
 811 {
 812     event.Enable( CanCut() );
 813 }
 814
 815 void wxComboBox::OnUpdateCopy(wxUpdateUIEvent& event)
 816 {
 817     event.Enable( CanCopy() );
 818 }
 819
 820 void wxComboBox::OnUpdatePaste(wxUpdateUIEvent& event)
 821 {
 822     event.Enable( CanPaste() );
 823 }
 824
 825 void wxComboBox::OnUpdateUndo(wxUpdateUIEvent& event)
 826 {
 827     event.Enable( CanUndo() );
 828 }
 829
 830 void wxComboBox::OnUpdateRedo(wxUpdateUIEvent& event)
 831 {
 832     event.Enable( CanRedo() );
 833 }
 834
 835 void wxComboBox::OnUpdateDelete(wxUpdateUIEvent& event)
 836 {
 837     event.Enable(HasSelection() && IsEditable()) ;
 838 }
 839
 840 void wxComboBox::OnUpdateSelectAll(wxUpdateUIEvent& event)
 841 {
 842     event.Enable(GetLastPosition() > 0);
 843 }
 844
 845 #endif // wxUSE_COMBOBOX
 846