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_SETFOCUS:
 178         case WM_KILLFOCUS:
 179             {
 180                 wxComboBox *combo = wxDynamicCast(win, wxComboBox);
 181                 if ( !combo )
 182                 {
 183                     // we can get WM_KILLFOCUS while our parent is already half
 184                     // destroyed and hence doesn't look like a combobx any
 185                     // longer, check for it to avoid bogus assert failures
 186                     if ( !win->IsBeingDeleted() )
 187                     {
 188                         wxFAIL_MSG( _T("should have combo as parent") );
 189                     }
 190                 }
 191                 else if ( combo->MSWProcessEditMsg(message, wParam, lParam) )
 192                 {
 193                     // handled by parent
 194                     return 0;
 195                 }
 196             }
 197             break;
 198
 199         case WM_GETDLGCODE:
 200             {
 201                 wxCHECK_MSG( win, 0, _T("should have a parent") );
 202
 203                 if ( win->GetWindowStyle() & wxPROCESS_ENTER )
 204                 {
 205                     // need to return a custom dlg code or we'll never get it
 206                     return DLGC_WANTMESSAGE;
 207                 }
 208             }
 209             break;
 210
 211         // deal with tooltips here
 212 #if wxUSE_TOOLTIPS && defined(TTN_NEEDTEXT)
 213         case WM_NOTIFY:
 214             {
 215                 wxCHECK_MSG( win, 0, _T("should have a parent") );
 216
 217                 NMHDR* hdr = (NMHDR *)lParam;
 218                 if ( hdr->code == TTN_NEEDTEXT )
 219                 {
 220                     wxToolTip *tooltip = win->GetToolTip();
 221                     if ( tooltip )
 222                     {
 223                         TOOLTIPTEXT *ttt = (TOOLTIPTEXT *)lParam;
 224                         ttt->lpszText = (wxChar *)tooltip->GetTip().c_str();
 225                     }
 226
 227                     // processed
 228                     return 0;
 229                 }
 230             }
 231             break;
 232 #endif // wxUSE_TOOLTIPS
 233     }
 234
 235     return ::CallWindowProc(CASTWNDPROC gs_wndprocEdit, hWnd, message, wParam, lParam);
 236 }
 237
 238 // ----------------------------------------------------------------------------
 239 // wxComboBox callbacks
 240 // ----------------------------------------------------------------------------
 241
 242 WXLRESULT wxComboBox::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam)
 243 {
 244     bool isSize = false;
 245     long fromOld, toOld;
 246
 247     // handle WM_CTLCOLOR messages from our EDIT control to be able to set its
 248     // colour correctly (to be the same as our own one)
 249     switch ( nMsg )
 250     {
 251         case CB_SETCURSEL:
 252             // Selection was set with SetSelection.  Update the value too.
 253             if ((int)wParam > GetCount())
 254                 m_value = wxEmptyString;
 255             else
 256                 m_value = GetString(wParam);
 257             m_selectionOld = -1;
 258             break;
 259         case WM_SIZE:
 260             GetSelection(&fromOld, &toOld);
 261             isSize = true;
 262             break;
 263     }
 264
 265     WXLRESULT result = wxChoice::MSWWindowProc(nMsg, wParam, lParam);
 266
 267     if(isSize)
 268     {
 269         long fromNew, toNew;
 270         GetSelection(&fromNew, &toNew);
 271
 272         if ( fromOld != fromNew || toOld != toNew )
 273         {
 274             SetSelection(fromOld, toOld);
 275         }
 276     }
 277
 278     return result;
 279 }
 280
 281 bool wxComboBox::MSWProcessEditMsg(WXUINT msg, WXWPARAM wParam, WXLPARAM lParam)
 282 {
 283     switch ( msg )
 284     {
 285         case WM_CHAR:
 286             // for compatibility with wxTextCtrl, generate a special message
 287             // when Enter is pressed
 288             if ( wParam == VK_RETURN )
 289             {
 290                 wxCommandEvent event(wxEVT_COMMAND_TEXT_ENTER, m_windowId);
 291                 InitCommandEvent(event);
 292                 event.SetString(GetValue());
 293                 event.SetInt(GetSelection());
 294                 if ( ProcessCommand(event) )
 295                 {
 296                     // don't let the event through to the native control
 297                     // because it doesn't need it and may generate an annoying
 298                     // beep if it gets it
 299                     return true;
 300                 }
 301             }
 302
 303             return HandleChar(wParam, lParam, true /* isASCII */);
 304
 305         case WM_KEYDOWN:
 306             return HandleKeyDown(wParam, lParam);
 307
 308         case WM_KEYUP:
 309             return HandleKeyUp(wParam, lParam);
 310
 311         case WM_SETFOCUS:
 312             return HandleSetFocus((WXHWND)wParam);
 313
 314         case WM_KILLFOCUS:
 315             return HandleKillFocus((WXHWND)wParam);
 316     }
 317
 318     return false;
 319 }
 320
 321 bool wxComboBox::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 322 {
 323     wxString value;
 324     int sel = -1;
 325     switch ( param )
 326     {
 327         case CBN_SELENDOK:
 328         case CBN_SELCHANGE:
 329             sel = GetSelection();
 330
 331             // we may sometimes get 2 CBN_SELCHANGE events or a CBN_SELENDOK
 332             // before CBN_SELCHANGE with the same index when the user selects
 333             // an item in the combobox -- ignore duplicates
 334             if ( sel > -1 && sel != m_selectionOld )
 335             {
 336                 m_selectionOld = sel;
 337
 338                 // GetValue() would still return the old value from here but
 339                 // according to the docs we should return the new value if the
 340                 // user calls it in his event handler, so update internal
 341                 // m_value
 342                 m_value = GetString(sel);
 343
 344                 wxCommandEvent event(wxEVT_COMMAND_COMBOBOX_SELECTED, GetId());
 345                 event.SetInt(sel);
 346                 event.SetEventObject(this);
 347                 event.SetString(m_value);
 348                 ProcessCommand(event);
 349             }
 350             else // no valid selection
 351             {
 352                 m_selectionOld = sel;
 353
 354                 // hence no EVT_TEXT neither
 355                 break;
 356             }
 357
 358             // fall through: for compability with wxGTK, also send the text
 359             // update event when the selection changes (this also seems more
 360             // logical as the text does change)
 361
 362         case CBN_EDITCHANGE:
 363             {
 364                 wxCommandEvent event(wxEVT_COMMAND_TEXT_UPDATED, GetId());
 365
 366                 // if sel != -1, value was initialized above (and we can't use
 367                 // GetValue() here as it would return the old selection and we
 368                 // want the new one)
 369                 if ( sel == -1 )
 370                 {
 371                     m_value = wxGetWindowText(GetHwnd());
 372                     m_selectionOld = -1;
 373                 }
 374                 else // we're synthesizing text updated event from sel change
 375                 {
 376                     // We need to retrieve the current selection because the
 377                     // user may have changed it in the previous handler (for
 378                     // CBN_SELCHANGE above).
 379                     sel = GetSelection();
 380                     if ( sel > -1 )
 381                     {
 382                         m_value = GetString(sel);
 383                     }
 384                 }
 385
 386                 event.SetString(m_value);
 387                 event.SetEventObject(this);
 388                 ProcessCommand(event);
 389             }
 390             break;
 391     }
 392
 393     // there is no return value for the CBN_ notifications, so always return
 394     // false from here to pass the message to DefWindowProc()
 395     return false;
 396 }
 397
 398 WXHWND wxComboBox::GetEditHWND() const
 399 {
 400     // this function should not be called for wxCB_READONLY controls, it is
 401     // the callers responsability to check this
 402     wxASSERT_MSG( !(GetWindowStyle() & wxCB_READONLY),
 403                   _T("read-only combobox doesn't have any edit control") );
 404
 405     POINT pt;
 406     pt.x = pt.y = 4;
 407     HWND hwndEdit = ::ChildWindowFromPoint(GetHwnd(), pt);
 408     if ( !hwndEdit || hwndEdit == GetHwnd() )
 409     {
 410         wxFAIL_MSG(_T("not read only combobox without edit control?"));
 411     }
 412
 413     return (WXHWND)hwndEdit;
 414 }
 415
 416 // ----------------------------------------------------------------------------
 417 // wxComboBox creation
 418 // ----------------------------------------------------------------------------
 419
 420 bool wxComboBox::Create(wxWindow *parent, wxWindowID id,
 421                         const wxString& value,
 422                         const wxPoint& pos,
 423                         const wxSize& size,
 424                         int n, const wxString choices[],
 425                         long style,
 426                         const wxValidator& validator,
 427                         const wxString& name)
 428 {
 429     // pretend that wxComboBox is hidden while it is positioned and resized and
 430     // show it only right before leaving this method because otherwise there is
 431     // some noticeable flicker while the control rearranges itself
 432     m_isShown = false;
 433
 434     if ( !CreateAndInit(parent, id, pos, size, n, choices, style,
 435                         validator, name) )
 436         return false;
 437
 438     // we shouldn't call SetValue() for an empty string because this would
 439     // (correctly) result in an assert with a read only combobox and is useless
 440     // for the other ones anyhow
 441     if ( !value.empty() )
 442         SetValue(value);
 443
 444     // a (not read only) combobox is, in fact, 2 controls: the combobox itself
 445     // and an edit control inside it and if we want to catch events from this
 446     // edit control, we must subclass it as well
 447     if ( !(style & wxCB_READONLY) )
 448     {
 449         gs_wndprocEdit = wxSetWindowProc((HWND)GetEditHWND(),
 450                                          wxComboEditWndProc);
 451     }
 452
 453     // and finally, show the control
 454     Show(true);
 455
 456     return true;
 457 }
 458
 459 bool wxComboBox::Create(wxWindow *parent, wxWindowID id,
 460                         const wxString& value,
 461                         const wxPoint& pos,
 462                         const wxSize& size,
 463                         const wxArrayString& choices,
 464                         long style,
 465                         const wxValidator& validator,
 466                         const wxString& name)
 467 {
 468     wxCArrayString chs(choices);
 469     return Create(parent, id, value, pos, size, chs.GetCount(),
 470                   chs.GetStrings(), style, validator, name);
 471 }
 472
 473 WXDWORD wxComboBox::MSWGetStyle(long style, WXDWORD *exstyle) const
 474 {
 475     // we never have an external border
 476     WXDWORD msStyle = wxChoice::MSWGetStyle
 477                       (
 478                         (style & ~wxBORDER_MASK) | wxBORDER_NONE, exstyle
 479                       );
 480
 481     // usually WS_TABSTOP is added by wxControl::MSWGetStyle() but as we're
 482     // created hidden (see Create() above), it is not done for us but we still
 483     // want to have this style
 484     msStyle |= WS_TABSTOP;
 485
 486     // remove the style always added by wxChoice
 487     msStyle &= ~CBS_DROPDOWNLIST;
 488
 489     if ( style & wxCB_READONLY )
 490         msStyle |= CBS_DROPDOWNLIST;
 491 #ifndef __WXWINCE__
 492     else if ( style & wxCB_SIMPLE )
 493         msStyle |= CBS_SIMPLE; // A list (shown always) and edit control
 494 #endif
 495     else
 496         msStyle |= CBS_DROPDOWN;
 497
 498     // there is no reason to not always use CBS_AUTOHSCROLL, so do use it
 499     msStyle |= CBS_AUTOHSCROLL;
 500
 501     // NB: we used to also add CBS_NOINTEGRALHEIGHT here but why?
 502
 503     return msStyle;
 504 }
 505
 506 // ----------------------------------------------------------------------------
 507 // wxComboBox text control-like methods
 508 // ----------------------------------------------------------------------------
 509
 510 void wxComboBox::SetValue(const wxString& value)
 511 {
 512     if ( HasFlag(wxCB_READONLY) )
 513         SetStringSelection(value);
 514     else
 515         SetWindowText(GetHwnd(), value.c_str());
 516
 517     m_value = value;
 518     m_selectionOld = GetSelection();
 519 }
 520
 521 // Clipboard operations
 522 void wxComboBox::Copy()
 523 {
 524     SendMessage(GetHwnd(), WM_COPY, 0, 0L);
 525 }
 526
 527 void wxComboBox::Cut()
 528 {
 529     SendMessage(GetHwnd(), WM_CUT, 0, 0L);
 530 }
 531
 532 void wxComboBox::Paste()
 533 {
 534     SendMessage(GetHwnd(), WM_PASTE, 0, 0L);
 535 }
 536
 537 void wxComboBox::Undo()
 538 {
 539     if (CanUndo())
 540     {
 541         HWND hEditWnd = (HWND) GetEditHWND() ;
 542         if ( hEditWnd )
 543             ::SendMessage(hEditWnd, EM_UNDO, 0, 0);
 544     }
 545 }
 546
 547 void wxComboBox::Redo()
 548 {
 549     if (CanUndo())
 550     {
 551         // Same as Undo, since Undo undoes the undo, i.e. a redo.
 552         HWND hEditWnd = (HWND) GetEditHWND() ;
 553         if ( hEditWnd )
 554             ::SendMessage(hEditWnd, EM_UNDO, 0, 0);
 555     }
 556 }
 557
 558 void wxComboBox::SelectAll()
 559 {
 560     SetSelection(0, GetLastPosition());
 561 }
 562
 563 bool wxComboBox::CanUndo() const
 564 {
 565     if (!IsEditable())
 566         return false;
 567
 568     HWND hEditWnd = (HWND) GetEditHWND() ;
 569     if ( hEditWnd )
 570         return ::SendMessage(hEditWnd, EM_CANUNDO, 0, 0) != 0;
 571     else
 572         return false;
 573 }
 574
 575 bool wxComboBox::CanRedo() const
 576 {
 577     if (!IsEditable())
 578         return false;
 579
 580     HWND hEditWnd = (HWND) GetEditHWND() ;
 581     if ( hEditWnd )
 582         return ::SendMessage(hEditWnd, EM_CANUNDO, 0, 0) != 0;
 583     else
 584         return false;
 585 }
 586
 587 bool wxComboBox::HasSelection() const
 588 {
 589     long from, to;
 590     GetSelection(&from, &to);
 591     return from != to;
 592 }
 593
 594 bool wxComboBox::CanCopy() const
 595 {
 596     // Can copy if there's a selection
 597     return HasSelection();
 598 }
 599
 600 bool wxComboBox::CanCut() const
 601 {
 602     return IsEditable() && CanCopy() ;
 603 }
 604
 605 bool wxComboBox::CanPaste() const
 606 {
 607     if ( !IsEditable() )
 608         return false;
 609
 610     // Standard edit control: check for straight text on clipboard
 611     if ( !::OpenClipboard(GetHwndOf(wxTheApp->GetTopWindow())) )
 612         return false;
 613
 614     bool isTextAvailable = ::IsClipboardFormatAvailable(CF_TEXT) != 0;
 615     ::CloseClipboard();
 616
 617     return isTextAvailable;
 618 }
 619
 620 bool wxComboBox::IsEditable() const
 621 {
 622     return !HasFlag(wxCB_READONLY);
 623 }
 624
 625 void wxComboBox::SetEditable(bool WXUNUSED(editable))
 626 {
 627   // Can't implement in MSW?
 628 //  HWND hWnd = GetHwnd();
 629 //  SendMessage(hWnd, EM_SETREADONLY, (WPARAM)!editable, (LPARAM)0L);
 630 }
 631
 632 void wxComboBox::SetInsertionPoint(long pos)
 633 {
 634     if ( GetWindowStyle() & wxCB_READONLY )
 635         return;
 636
 637 #ifdef __WIN32__
 638     HWND hWnd = GetHwnd();
 639     ::SendMessage(hWnd, CB_SETEDITSEL, 0, MAKELPARAM(pos, pos));
 640     HWND hEditWnd = (HWND) GetEditHWND() ;
 641     if ( hEditWnd )
 642     {
 643         // Scroll insertion point into view
 644         SendMessage(hEditWnd, EM_SCROLLCARET, (WPARAM)0, (LPARAM)0);
 645         // Why is this necessary? (Copied from wxTextCtrl::SetInsertionPoint)
 646         SendMessage(hEditWnd, EM_REPLACESEL, 0, (LPARAM) wxEmptyString);
 647     }
 648 #endif // __WIN32__
 649 }
 650
 651 void wxComboBox::SetInsertionPointEnd()
 652 {
 653     // setting insertion point doesn't make sense for read only comboboxes
 654     if ( !(GetWindowStyle() & wxCB_READONLY) )
 655     {
 656         wxTextPos pos = GetLastPosition();
 657         SetInsertionPoint(pos);
 658     }
 659 }
 660
 661 long wxComboBox::GetInsertionPoint() const
 662 {
 663     // CB_GETEDITSEL returns the index of the last character after selection in
 664     // its high-order word
 665     DWORD pos= (DWORD)::SendMessage(GetHwnd(), CB_GETEDITSEL, 0, 0L);
 666
 667     return HIWORD(pos);
 668 }
 669
 670 wxTextPos wxComboBox::GetLastPosition() const
 671 {
 672     HWND hEditWnd = (HWND) GetEditHWND();
 673
 674     // Get number of characters in the last (only) line. We'll add this to the character
 675     // index for the last line, 1st position.
 676     wxTextPos lineLength = (wxTextPos)SendMessage(hEditWnd, EM_LINELENGTH, (WPARAM) 0, (LPARAM)0L);
 677
 678     return lineLength;
 679 }
 680
 681 void wxComboBox::Replace(long from, long to, const wxString& value)
 682 {
 683 #if wxUSE_CLIPBOARD
 684     Remove(from, to);
 685
 686     // Now replace with 'value', by pasting.
 687     wxSetClipboardData(wxDF_TEXT, (wxObject *)(const wxChar *)value, 0, 0);
 688
 689     // Paste into edit control
 690     SendMessage(GetHwnd(), WM_PASTE, (WPARAM)0, (LPARAM)0L);
 691 #endif
 692 }
 693
 694 void wxComboBox::Remove(long from, long to)
 695 {
 696     // Set selection and remove it
 697     SetSelection(from, to);
 698     SendMessage(GetHwnd(), WM_CUT, (WPARAM)0, (LPARAM)0);
 699 }
 700
 701 void wxComboBox::SetSelection(long from, long to)
 702 {
 703     // if from and to are both -1, it means (in wxWidgets) that all text should
 704     // be selected, translate this into Windows convention
 705     if ( (from == -1) && (to == -1) )
 706     {
 707         from = 0;
 708     }
 709
 710     if ( SendMessage(GetHwnd(), CB_SETEDITSEL,
 711                      0, (LPARAM)MAKELONG(from, to)) == CB_ERR )
 712     {
 713         wxLogDebug(_T("CB_SETEDITSEL failed"));
 714     }
 715 }
 716
 717 void wxComboBox::GetSelection(long* from, long* to) const
 718 {
 719     DWORD dwStart, dwEnd;
 720     if ( ::SendMessage(GetHwnd(), CB_GETEDITSEL,
 721                        (WPARAM)&dwStart, (LPARAM)&dwEnd) == CB_ERR )
 722     {
 723         *from =
 724         *to = 0;
 725     }
 726     else
 727     {
 728         *from = dwStart;
 729         *to = dwEnd;
 730     }
 731 }
 732
 733 int wxComboBox::GetSelection() const
 734 {
 735     return wxChoice::GetSelection();
 736 }
 737
 738 // ----------------------------------------------------------------------------
 739 // standard event handling
 740 // ----------------------------------------------------------------------------
 741
 742 void wxComboBox::OnCut(wxCommandEvent& WXUNUSED(event))
 743 {
 744     Cut();
 745 }
 746
 747 void wxComboBox::OnCopy(wxCommandEvent& WXUNUSED(event))
 748 {
 749     Copy();
 750 }
 751
 752 void wxComboBox::OnPaste(wxCommandEvent& WXUNUSED(event))
 753 {
 754     Paste();
 755 }
 756
 757 void wxComboBox::OnUndo(wxCommandEvent& WXUNUSED(event))
 758 {
 759     Undo();
 760 }
 761
 762 void wxComboBox::OnRedo(wxCommandEvent& WXUNUSED(event))
 763 {
 764     Redo();
 765 }
 766
 767 void wxComboBox::OnDelete(wxCommandEvent& WXUNUSED(event))
 768 {
 769     long from, to;
 770     GetSelection(& from, & to);
 771     if (from != -1 && to != -1)
 772         Remove(from, to);
 773 }
 774
 775 void wxComboBox::OnSelectAll(wxCommandEvent& WXUNUSED(event))
 776 {
 777     SetSelection(-1, -1);
 778 }
 779
 780 void wxComboBox::OnUpdateCut(wxUpdateUIEvent& event)
 781 {
 782     event.Enable( CanCut() );
 783 }
 784
 785 void wxComboBox::OnUpdateCopy(wxUpdateUIEvent& event)
 786 {
 787     event.Enable( CanCopy() );
 788 }
 789
 790 void wxComboBox::OnUpdatePaste(wxUpdateUIEvent& event)
 791 {
 792     event.Enable( CanPaste() );
 793 }
 794
 795 void wxComboBox::OnUpdateUndo(wxUpdateUIEvent& event)
 796 {
 797     event.Enable( CanUndo() );
 798 }
 799
 800 void wxComboBox::OnUpdateRedo(wxUpdateUIEvent& event)
 801 {
 802     event.Enable( CanRedo() );
 803 }
 804
 805 void wxComboBox::OnUpdateDelete(wxUpdateUIEvent& event)
 806 {
 807     event.Enable(HasSelection() && IsEditable()) ;
 808 }
 809
 810 void wxComboBox::OnUpdateSelectAll(wxUpdateUIEvent& event)
 811 {
 812     event.Enable(GetLastPosition() > 0);
 813 }
 814
 815 #endif // wxUSE_COMBOBOX
 816