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 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  21 #pragma implementation "combobox.h"
  22 #endif
  23
  24 // For compilers that support precompilation, includes "wx.h".
  25 #include "wx/wxprec.h"
  26
  27 #ifdef __BORLANDC__
  28     #pragma hdrstop
  29 #endif
  30
  31 #if wxUSE_COMBOBOX
  32
  33 #ifndef WX_PRECOMP
  34     #include "wx/settings.h"
  35     #include "wx/log.h"
  36     // for wxEVT_COMMAND_TEXT_ENTER
  37     #include "wx/textctrl.h"
  38 #endif
  39
  40 #include "wx/app.h"
  41 #include "wx/combobox.h"
  42 #include "wx/brush.h"
  43 #include "wx/clipbrd.h"
  44 #include "wx/msw/private.h"
  45
  46 #if wxUSE_TOOLTIPS
  47     #if !defined(__GNUWIN32_OLD__) || defined(__CYGWIN10__)
  48         #include <commctrl.h>
  49     #endif
  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, wxControl,"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, wxControl)
 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( _T("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, _T("should have a parent") );
 205
 206                 if ( win->GetWindowStyle() & wxPROCESS_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         // deal with tooltips here
 215 #if wxUSE_TOOLTIPS && defined(TTN_NEEDTEXT)
 216         case WM_NOTIFY:
 217             {
 218                 wxCHECK_MSG( win, 0, _T("should have a parent") );
 219
 220                 NMHDR* hdr = (NMHDR *)lParam;
 221                 if ( hdr->code == TTN_NEEDTEXT )
 222                 {
 223                     wxToolTip *tooltip = win->GetToolTip();
 224                     if ( tooltip )
 225                     {
 226                         TOOLTIPTEXT *ttt = (TOOLTIPTEXT *)lParam;
 227                         ttt->lpszText = (wxChar *)tooltip->GetTip().c_str();
 228                     }
 229
 230                     // processed
 231                     return 0;
 232                 }
 233             }
 234             break;
 235 #endif // wxUSE_TOOLTIPS
 236     }
 237
 238     return ::CallWindowProc(CASTWNDPROC gs_wndprocEdit, hWnd, message, wParam, lParam);
 239 }
 240
 241 // ----------------------------------------------------------------------------
 242 // wxComboBox callbacks
 243 // ----------------------------------------------------------------------------
 244
 245 WXLRESULT wxComboBox::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam)
 246 {
 247     // TODO: handle WM_CTLCOLOR messages from our EDIT control to be able to
 248     //       set its colour correctly (to be the same as our own one)
 249
 250     switch ( nMsg )
 251     {
 252         case CB_SETCURSEL:
 253             // Selection was set with SetSelection.  Update the value too.
 254             if ((int)wParam > GetCount())
 255                 m_value.clear();
 256             else
 257                 m_value = GetString(wParam);
 258             m_selectionOld = -1;
 259             break;
 260
 261         case WM_SIZE:
 262         // wxStaticBox can generate this message, when modifying the control's style.
 263         // This causes the content of the combobox to be selected, for some reason.
 264         case WM_STYLECHANGED:
 265             {
 266                 // combobox selection sometimes spontaneously changes when its
 267                 // size changes, restore it to the old value if necessary
 268                 long fromOld, toOld;
 269                 GetSelection(&fromOld, &toOld);
 270                 WXLRESULT result = wxChoice::MSWWindowProc(nMsg, wParam, lParam);
 271
 272                 long fromNew, toNew;
 273                 GetSelection(&fromNew, &toNew);
 274
 275                 if ( fromOld != fromNew || toOld != toNew )
 276                 {
 277                     SetSelection(fromOld, toOld);
 278                 }
 279
 280                 return result;
 281             }
 282     }
 283
 284     return wxChoice::MSWWindowProc(nMsg, wParam, lParam);
 285 }
 286
 287 bool wxComboBox::MSWProcessEditMsg(WXUINT msg, WXWPARAM wParam, WXLPARAM lParam)
 288 {
 289     switch ( msg )
 290     {
 291         case WM_CHAR:
 292             // for compatibility with wxTextCtrl, generate a special message
 293             // when Enter is pressed
 294             if ( wParam == VK_RETURN )
 295             {
 296                 wxCommandEvent event(wxEVT_COMMAND_TEXT_ENTER, m_windowId);
 297                 InitCommandEvent(event);
 298                 event.SetString(GetValue());
 299                 event.SetInt(GetSelection());
 300                 if ( ProcessCommand(event) )
 301                 {
 302                     // don't let the event through to the native control
 303                     // because it doesn't need it and may generate an annoying
 304                     // beep if it gets it
 305                     return true;
 306                 }
 307             }
 308             // fall through
 309
 310         case WM_SYSCHAR:
 311             return HandleChar(wParam, lParam, true /* isASCII */);
 312
 313         case WM_SYSKEYDOWN:
 314         case WM_KEYDOWN:
 315             return HandleKeyDown(wParam, lParam);
 316
 317         case WM_SYSKEYUP:
 318         case WM_KEYUP:
 319             return HandleKeyUp(wParam, lParam);
 320
 321         case WM_SETFOCUS:
 322             return HandleSetFocus((WXHWND)wParam);
 323
 324         case WM_KILLFOCUS:
 325             return HandleKillFocus((WXHWND)wParam);
 326     }
 327
 328     return false;
 329 }
 330
 331 bool wxComboBox::MSWCommand(WXUINT param, WXWORD id)
 332 {
 333     wxString value;
 334     int sel = -1;
 335     switch ( param )
 336     {
 337         case CBN_SELENDOK:
 338         case CBN_SELCHANGE:
 339             sel = GetSelection();
 340
 341             // we may sometimes get 2 CBN_SELCHANGE events or a CBN_SELENDOK
 342             // before CBN_SELCHANGE with the same index when the user selects
 343             // an item in the combobox -- ignore duplicates
 344             if ( sel > -1 && sel != m_selectionOld )
 345             {
 346                 m_selectionOld = sel;
 347
 348                 // GetValue() would still return the old value from here but
 349                 // according to the docs we should return the new value if the
 350                 // user calls it in his event handler, so update internal
 351                 // m_value
 352                 m_value = GetString(sel);
 353
 354                 wxCommandEvent event(wxEVT_COMMAND_COMBOBOX_SELECTED, GetId());
 355                 event.SetInt(sel);
 356                 event.SetEventObject(this);
 357                 event.SetString(m_value);
 358                 ProcessCommand(event);
 359             }
 360             else // no valid selection
 361             {
 362                 m_selectionOld = sel;
 363
 364                 // hence no EVT_TEXT neither
 365                 break;
 366             }
 367
 368             // fall through: for compability with wxGTK, also send the text
 369             // update event when the selection changes (this also seems more
 370             // logical as the text does change)
 371
 372         case CBN_EDITCHANGE:
 373             {
 374                 wxCommandEvent event(wxEVT_COMMAND_TEXT_UPDATED, GetId());
 375
 376                 // if sel != -1, value was initialized above (and we can't use
 377                 // GetValue() here as it would return the old selection and we
 378                 // want the new one)
 379                 if ( sel == -1 )
 380                 {
 381                     m_value = wxGetWindowText(GetHwnd());
 382                     m_selectionOld = -1;
 383                 }
 384                 else // we're synthesizing text updated event from sel change
 385                 {
 386                     // We need to retrieve the current selection because the
 387                     // user may have changed it in the previous handler (for
 388                     // CBN_SELCHANGE above).
 389                     sel = GetSelection();
 390                     if ( sel > -1 )
 391                     {
 392                         m_value = GetString(sel);
 393                     }
 394                 }
 395
 396                 event.SetString(m_value);
 397                 event.SetEventObject(this);
 398                 ProcessCommand(event);
 399             }
 400             break;
 401
 402         default:
 403             return wxChoice::MSWCommand(param, id);
 404     }
 405
 406     // let the def window proc have it by returning false, but do not pass the
 407     // message we've already handled here (notably CBN_SELCHANGE) to the base
 408     // class as it would generate another event for them
 409     return false;
 410 }
 411
 412 WXHWND wxComboBox::GetEditHWND() const
 413 {
 414     // this function should not be called for wxCB_READONLY controls, it is
 415     // the callers responsability to check this
 416     wxASSERT_MSG( !(GetWindowStyle() & wxCB_READONLY),
 417                   _T("read-only combobox doesn't have any edit control") );
 418
 419     POINT pt;
 420     pt.x = pt.y = 4;
 421     HWND hwndEdit = ::ChildWindowFromPoint(GetHwnd(), pt);
 422     if ( !hwndEdit || hwndEdit == GetHwnd() )
 423     {
 424         wxFAIL_MSG(_T("not read only combobox without edit control?"));
 425     }
 426
 427     return (WXHWND)hwndEdit;
 428 }
 429
 430 // ----------------------------------------------------------------------------
 431 // wxComboBox creation
 432 // ----------------------------------------------------------------------------
 433
 434 bool wxComboBox::Create(wxWindow *parent, wxWindowID id,
 435                         const wxString& value,
 436                         const wxPoint& pos,
 437                         const wxSize& size,
 438                         int n, const wxString choices[],
 439                         long style,
 440                         const wxValidator& validator,
 441                         const wxString& name)
 442 {
 443     // pretend that wxComboBox is hidden while it is positioned and resized and
 444     // show it only right before leaving this method because otherwise there is
 445     // some noticeable flicker while the control rearranges itself
 446     m_isShown = false;
 447
 448     if ( !CreateAndInit(parent, id, pos, size, n, choices, style,
 449                         validator, name) )
 450         return false;
 451
 452     // we shouldn't call SetValue() for an empty string because this would
 453     // (correctly) result in an assert with a read only combobox and is useless
 454     // for the other ones anyhow
 455     if ( !value.empty() )
 456         SetValue(value);
 457
 458     // a (not read only) combobox is, in fact, 2 controls: the combobox itself
 459     // and an edit control inside it and if we want to catch events from this
 460     // edit control, we must subclass it as well
 461     if ( !(style & wxCB_READONLY) )
 462     {
 463         gs_wndprocEdit = wxSetWindowProc((HWND)GetEditHWND(),
 464                                          wxComboEditWndProc);
 465     }
 466
 467     // and finally, show the control
 468     Show(true);
 469
 470     return true;
 471 }
 472
 473 bool wxComboBox::Create(wxWindow *parent, wxWindowID id,
 474                         const wxString& value,
 475                         const wxPoint& pos,
 476                         const wxSize& size,
 477                         const wxArrayString& choices,
 478                         long style,
 479                         const wxValidator& validator,
 480                         const wxString& name)
 481 {
 482     wxCArrayString chs(choices);
 483     return Create(parent, id, value, pos, size, chs.GetCount(),
 484                   chs.GetStrings(), style, validator, name);
 485 }
 486
 487 WXDWORD wxComboBox::MSWGetStyle(long style, WXDWORD *exstyle) const
 488 {
 489     // we never have an external border
 490     WXDWORD msStyle = wxChoice::MSWGetStyle
 491                       (
 492                         (style & ~wxBORDER_MASK) | wxBORDER_NONE, exstyle
 493                       );
 494
 495     // usually WS_TABSTOP is added by wxControl::MSWGetStyle() but as we're
 496     // created hidden (see Create() above), it is not done for us but we still
 497     // want to have this style
 498     msStyle |= WS_TABSTOP;
 499
 500     // remove the style always added by wxChoice
 501     msStyle &= ~CBS_DROPDOWNLIST;
 502
 503     if ( style & wxCB_READONLY )
 504         msStyle |= CBS_DROPDOWNLIST;
 505 #ifndef __WXWINCE__
 506     else if ( style & wxCB_SIMPLE )
 507         msStyle |= CBS_SIMPLE; // A list (shown always) and edit control
 508 #endif
 509     else
 510         msStyle |= CBS_DROPDOWN;
 511
 512     // there is no reason to not always use CBS_AUTOHSCROLL, so do use it
 513     msStyle |= CBS_AUTOHSCROLL;
 514
 515     // NB: we used to also add CBS_NOINTEGRALHEIGHT here but why?
 516
 517     return msStyle;
 518 }
 519
 520 // ----------------------------------------------------------------------------
 521 // wxComboBox text control-like methods
 522 // ----------------------------------------------------------------------------
 523
 524 void wxComboBox::SetValue(const wxString& value)
 525 {
 526     if ( HasFlag(wxCB_READONLY) )
 527         SetStringSelection(value);
 528     else
 529         SetWindowText(GetHwnd(), value.c_str());
 530
 531     m_value = value;
 532     m_selectionOld = GetSelection();
 533 }
 534
 535 // Clipboard operations
 536 void wxComboBox::Copy()
 537 {
 538     SendMessage(GetHwnd(), WM_COPY, 0, 0L);
 539 }
 540
 541 void wxComboBox::Cut()
 542 {
 543     SendMessage(GetHwnd(), WM_CUT, 0, 0L);
 544 }
 545
 546 void wxComboBox::Paste()
 547 {
 548     SendMessage(GetHwnd(), WM_PASTE, 0, 0L);
 549 }
 550
 551 void wxComboBox::Undo()
 552 {
 553     if (CanUndo())
 554     {
 555         HWND hEditWnd = (HWND) GetEditHWND() ;
 556         if ( hEditWnd )
 557             ::SendMessage(hEditWnd, EM_UNDO, 0, 0);
 558     }
 559 }
 560
 561 void wxComboBox::Redo()
 562 {
 563     if (CanUndo())
 564     {
 565         // Same as Undo, since Undo undoes the undo, i.e. a redo.
 566         HWND hEditWnd = (HWND) GetEditHWND() ;
 567         if ( hEditWnd )
 568             ::SendMessage(hEditWnd, EM_UNDO, 0, 0);
 569     }
 570 }
 571
 572 void wxComboBox::SelectAll()
 573 {
 574     SetSelection(0, GetLastPosition());
 575 }
 576
 577 bool wxComboBox::CanUndo() const
 578 {
 579     if (!IsEditable())
 580         return false;
 581
 582     HWND hEditWnd = (HWND) GetEditHWND() ;
 583     if ( hEditWnd )
 584         return ::SendMessage(hEditWnd, EM_CANUNDO, 0, 0) != 0;
 585     else
 586         return false;
 587 }
 588
 589 bool wxComboBox::CanRedo() const
 590 {
 591     if (!IsEditable())
 592         return false;
 593
 594     HWND hEditWnd = (HWND) GetEditHWND() ;
 595     if ( hEditWnd )
 596         return ::SendMessage(hEditWnd, EM_CANUNDO, 0, 0) != 0;
 597     else
 598         return false;
 599 }
 600
 601 bool wxComboBox::HasSelection() const
 602 {
 603     long from, to;
 604     GetSelection(&from, &to);
 605     return from != to;
 606 }
 607
 608 bool wxComboBox::CanCopy() const
 609 {
 610     // Can copy if there's a selection
 611     return HasSelection();
 612 }
 613
 614 bool wxComboBox::CanCut() const
 615 {
 616     return IsEditable() && CanCopy() ;
 617 }
 618
 619 bool wxComboBox::CanPaste() const
 620 {
 621     if ( !IsEditable() )
 622         return false;
 623
 624     // Standard edit control: check for straight text on clipboard
 625     if ( !::OpenClipboard(GetHwndOf(wxTheApp->GetTopWindow())) )
 626         return false;
 627
 628     bool isTextAvailable = ::IsClipboardFormatAvailable(CF_TEXT) != 0;
 629     ::CloseClipboard();
 630
 631     return isTextAvailable;
 632 }
 633
 634 bool wxComboBox::IsEditable() const
 635 {
 636     return !HasFlag(wxCB_READONLY);
 637 }
 638
 639 void wxComboBox::SetEditable(bool WXUNUSED(editable))
 640 {
 641   // Can't implement in MSW?
 642 //  HWND hWnd = GetHwnd();
 643 //  SendMessage(hWnd, EM_SETREADONLY, (WPARAM)!editable, (LPARAM)0L);
 644 }
 645
 646 void wxComboBox::SetInsertionPoint(long pos)
 647 {
 648     if ( GetWindowStyle() & wxCB_READONLY )
 649         return;
 650
 651 #ifdef __WIN32__
 652     HWND hWnd = GetHwnd();
 653     ::SendMessage(hWnd, CB_SETEDITSEL, 0, MAKELPARAM(pos, pos));
 654     HWND hEditWnd = (HWND) GetEditHWND() ;
 655     if ( hEditWnd )
 656     {
 657         // Scroll insertion point into view
 658         SendMessage(hEditWnd, EM_SCROLLCARET, (WPARAM)0, (LPARAM)0);
 659         // Why is this necessary? (Copied from wxTextCtrl::SetInsertionPoint)
 660         SendMessage(hEditWnd, EM_REPLACESEL, 0, (LPARAM) wxEmptyString);
 661     }
 662 #endif // __WIN32__
 663 }
 664
 665 void wxComboBox::SetInsertionPointEnd()
 666 {
 667     // setting insertion point doesn't make sense for read only comboboxes
 668     if ( !(GetWindowStyle() & wxCB_READONLY) )
 669     {
 670         wxTextPos pos = GetLastPosition();
 671         SetInsertionPoint(pos);
 672     }
 673 }
 674
 675 long wxComboBox::GetInsertionPoint() const
 676 {
 677     // CB_GETEDITSEL returns the index of the first character of the selection in
 678     // its low-order word
 679     DWORD pos= (DWORD)::SendMessage(GetHwnd(), CB_GETEDITSEL, 0, 0L);
 680     return LOWORD(pos);
 681 }
 682
 683 wxTextPos wxComboBox::GetLastPosition() const
 684 {
 685     HWND hEditWnd = (HWND) GetEditHWND();
 686
 687     // Get number of characters in the last (only) line. We'll add this to the character
 688     // index for the last line, 1st position.
 689     wxTextPos lineLength = (wxTextPos)SendMessage(hEditWnd, EM_LINELENGTH, (WPARAM) 0, (LPARAM)0L);
 690
 691     return lineLength;
 692 }
 693
 694 void wxComboBox::Replace(long from, long to, const wxString& value)
 695 {
 696 #if wxUSE_CLIPBOARD
 697     Remove(from, to);
 698
 699     // Now replace with 'value', by pasting.
 700     wxSetClipboardData(wxDF_TEXT, (wxObject *)(const wxChar *)value, 0, 0);
 701
 702     // Paste into edit control
 703     SendMessage(GetHwnd(), WM_PASTE, (WPARAM)0, (LPARAM)0L);
 704 #else
 705     wxUnusedVar(from);
 706     wxUnusedVar(to);
 707     wxUnusedVar(value);
 708 #endif
 709 }
 710
 711 void wxComboBox::Remove(long from, long to)
 712 {
 713     // Set selection and remove it
 714     SetSelection(from, to);
 715     SendMessage(GetHwnd(), WM_CUT, (WPARAM)0, (LPARAM)0);
 716 }
 717
 718 void wxComboBox::SetSelection(long from, long to)
 719 {
 720     // if from and to are both -1, it means (in wxWidgets) that all text should
 721     // be selected, translate this into Windows convention
 722     if ( (from == -1) && (to == -1) )
 723     {
 724         from = 0;
 725     }
 726
 727     if ( SendMessage(GetHwnd(), CB_SETEDITSEL,
 728                      0, (LPARAM)MAKELONG(from, to)) == CB_ERR )
 729     {
 730         wxLogDebug(_T("CB_SETEDITSEL failed"));
 731     }
 732 }
 733
 734 void wxComboBox::GetSelection(long* from, long* to) const
 735 {
 736     DWORD dwStart, dwEnd;
 737     if ( ::SendMessage(GetHwnd(), CB_GETEDITSEL,
 738                        (WPARAM)&dwStart, (LPARAM)&dwEnd) == CB_ERR )
 739     {
 740         *from =
 741         *to = 0;
 742     }
 743     else
 744     {
 745         *from = dwStart;
 746         *to = dwEnd;
 747     }
 748 }
 749
 750 int wxComboBox::GetSelection() const
 751 {
 752     return wxChoice::GetSelection();
 753 }
 754
 755 // ----------------------------------------------------------------------------
 756 // standard event handling
 757 // ----------------------------------------------------------------------------
 758
 759 void wxComboBox::OnCut(wxCommandEvent& WXUNUSED(event))
 760 {
 761     Cut();
 762 }
 763
 764 void wxComboBox::OnCopy(wxCommandEvent& WXUNUSED(event))
 765 {
 766     Copy();
 767 }
 768
 769 void wxComboBox::OnPaste(wxCommandEvent& WXUNUSED(event))
 770 {
 771     Paste();
 772 }
 773
 774 void wxComboBox::OnUndo(wxCommandEvent& WXUNUSED(event))
 775 {
 776     Undo();
 777 }
 778
 779 void wxComboBox::OnRedo(wxCommandEvent& WXUNUSED(event))
 780 {
 781     Redo();
 782 }
 783
 784 void wxComboBox::OnDelete(wxCommandEvent& WXUNUSED(event))
 785 {
 786     long from, to;
 787     GetSelection(& from, & to);
 788     if (from != -1 && to != -1)
 789         Remove(from, to);
 790 }
 791
 792 void wxComboBox::OnSelectAll(wxCommandEvent& WXUNUSED(event))
 793 {
 794     SetSelection(-1, -1);
 795 }
 796
 797 void wxComboBox::OnUpdateCut(wxUpdateUIEvent& event)
 798 {
 799     event.Enable( CanCut() );
 800 }
 801
 802 void wxComboBox::OnUpdateCopy(wxUpdateUIEvent& event)
 803 {
 804     event.Enable( CanCopy() );
 805 }
 806
 807 void wxComboBox::OnUpdatePaste(wxUpdateUIEvent& event)
 808 {
 809     event.Enable( CanPaste() );
 810 }
 811
 812 void wxComboBox::OnUpdateUndo(wxUpdateUIEvent& event)
 813 {
 814     event.Enable( CanUndo() );
 815 }
 816
 817 void wxComboBox::OnUpdateRedo(wxUpdateUIEvent& event)
 818 {
 819     event.Enable( CanRedo() );
 820 }
 821
 822 void wxComboBox::OnUpdateDelete(wxUpdateUIEvent& event)
 823 {
 824     event.Enable(HasSelection() && IsEditable()) ;
 825 }
 826
 827 void wxComboBox::OnUpdateSelectAll(wxUpdateUIEvent& event)
 828 {
 829     event.Enable(GetLastPosition() > 0);
 830 }
 831
 832 #endif // wxUSE_COMBOBOX
 833