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