src/msw/combobox.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/msw/combobox.cpp
   3 // Purpose:     wxComboBox class
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     01/02/97
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 // For compilers that support precompilation, includes "wx.h".
  21 #include "wx/wxprec.h"
  22
  23 #ifdef __BORLANDC__
  24     #pragma hdrstop
  25 #endif
  26
  27 #if wxUSE_COMBOBOX
  28
  29 #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 WM_SIZE:
 249         // wxStaticBox can generate this message, when modifying the control's style.
 250         // This causes the content of the combobox to be selected, for some reason.
 251         case WM_STYLECHANGED:
 252             {
 253                 // combobox selection sometimes spontaneously changes when its
 254                 // size changes, restore it to the old value if necessary
 255                 long fromOld, toOld;
 256                 GetSelection(&fromOld, &toOld);
 257                 WXLRESULT result = wxChoice::MSWWindowProc(nMsg, wParam, lParam);
 258
 259                 long fromNew, toNew;
 260                 GetSelection(&fromNew, &toNew);
 261
 262                 if ( fromOld != fromNew || toOld != toNew )
 263                 {
 264                     SetSelection(fromOld, toOld);
 265                 }
 266
 267                 return result;
 268             }
 269     }
 270
 271     return wxChoice::MSWWindowProc(nMsg, wParam, lParam);
 272 }
 273
 274 bool wxComboBox::MSWProcessEditMsg(WXUINT msg, WXWPARAM wParam, WXLPARAM lParam)
 275 {
 276     switch ( msg )
 277     {
 278         case WM_CHAR:
 279             // for compatibility with wxTextCtrl, generate a special message
 280             // when Enter is pressed
 281             if ( wParam == VK_RETURN )
 282             {
 283                 wxCommandEvent event(wxEVT_COMMAND_TEXT_ENTER, m_windowId);
 284                 InitCommandEvent(event);
 285                 event.SetString(GetValue());
 286                 event.SetInt(GetSelection());
 287                 if ( ProcessCommand(event) )
 288                 {
 289                     // don't let the event through to the native control
 290                     // because it doesn't need it and may generate an annoying
 291                     // beep if it gets it
 292                     return true;
 293                 }
 294             }
 295             // fall through
 296
 297         case WM_SYSCHAR:
 298             return HandleChar(wParam, lParam, true /* isASCII */);
 299
 300         case WM_SYSKEYDOWN:
 301         case WM_KEYDOWN:
 302             return HandleKeyDown(wParam, lParam);
 303
 304         case WM_SYSKEYUP:
 305         case WM_KEYUP:
 306             return HandleKeyUp(wParam, lParam);
 307
 308         case WM_SETFOCUS:
 309             return HandleSetFocus((WXHWND)wParam);
 310
 311         case WM_KILLFOCUS:
 312             return HandleKillFocus((WXHWND)wParam);
 313     }
 314
 315     return false;
 316 }
 317
 318 bool wxComboBox::MSWCommand(WXUINT param, WXWORD id)
 319 {
 320     int sel = -1;
 321     wxString value;
 322
 323     switch ( param )
 324     {
 325         case CBN_SELENDOK:
 326 #ifndef __SMARTPHONE__
 327             // we need to reset this to prevent the selection from being undone
 328             // by wxChoice, see wxChoice::MSWCommand() and comments there
 329             m_lastAcceptedSelection = wxID_NONE;
 330 #endif
 331
 332             // set these variables so that they could be also fixed in
 333             // CBN_EDITCHANGE below
 334             sel = GetSelection();
 335             value = GetValue();
 336             {
 337                 wxCommandEvent event(wxEVT_COMMAND_COMBOBOX_SELECTED, GetId());
 338                 event.SetEventObject(this);
 339                 event.SetInt(sel);
 340                 event.SetString(value);
 341                 ProcessCommand(event);
 342             }
 343
 344             // fall through: for compability with wxGTK, also send the text
 345             // update event when the selection changes (this also seems more
 346             // logical as the text does change)
 347
 348         case CBN_EDITCHANGE:
 349             {
 350                 wxCommandEvent event(wxEVT_COMMAND_TEXT_UPDATED, GetId());
 351                 event.SetEventObject(this);
 352
 353                 // if sel != -1, value was already initialized above
 354                 if ( sel == -1 )
 355                 {
 356                     value = wxGetWindowText(GetHwnd());
 357                 }
 358
 359                 event.SetString(value);
 360                 ProcessCommand(event);
 361             }
 362             break;
 363
 364         default:
 365             return wxChoice::MSWCommand(param, id);
 366     }
 367
 368     // skip wxChoice version as it would generate its own events for
 369     // CBN_SELENDOK
 370     return wxControl::MSWCommand(param, id);
 371 }
 372
 373 WXHWND wxComboBox::GetEditHWND() const
 374 {
 375     // this function should not be called for wxCB_READONLY controls, it is
 376     // the callers responsability to check this
 377     wxASSERT_MSG( !(GetWindowStyle() & wxCB_READONLY),
 378                   _T("read-only combobox doesn't have any edit control") );
 379
 380     POINT pt;
 381     pt.x = pt.y = 4;
 382     HWND hwndEdit = ::ChildWindowFromPoint(GetHwnd(), pt);
 383     if ( !hwndEdit || hwndEdit == GetHwnd() )
 384     {
 385         wxFAIL_MSG(_T("not read only combobox without edit control?"));
 386     }
 387
 388     return (WXHWND)hwndEdit;
 389 }
 390
 391 // ----------------------------------------------------------------------------
 392 // wxComboBox creation
 393 // ----------------------------------------------------------------------------
 394
 395 bool wxComboBox::Create(wxWindow *parent, wxWindowID id,
 396                         const wxString& value,
 397                         const wxPoint& pos,
 398                         const wxSize& size,
 399                         int n, const wxString choices[],
 400                         long style,
 401                         const wxValidator& validator,
 402                         const wxString& name)
 403 {
 404     // pretend that wxComboBox is hidden while it is positioned and resized and
 405     // show it only right before leaving this method because otherwise there is
 406     // some noticeable flicker while the control rearranges itself
 407     m_isShown = false;
 408
 409     if ( !CreateAndInit(parent, id, pos, size, n, choices, style,
 410                         validator, name) )
 411         return false;
 412
 413     // we shouldn't call SetValue() for an empty string because this would
 414     // (correctly) result in an assert with a read only combobox and is useless
 415     // for the other ones anyhow
 416     if ( !value.empty() )
 417         SetValue(value);
 418
 419     // a (not read only) combobox is, in fact, 2 controls: the combobox itself
 420     // and an edit control inside it and if we want to catch events from this
 421     // edit control, we must subclass it as well
 422     if ( !(style & wxCB_READONLY) )
 423     {
 424         gs_wndprocEdit = wxSetWindowProc((HWND)GetEditHWND(),
 425                                          wxComboEditWndProc);
 426     }
 427
 428     // and finally, show the control
 429     Show(true);
 430
 431     return true;
 432 }
 433
 434 bool wxComboBox::Create(wxWindow *parent, wxWindowID id,
 435                         const wxString& value,
 436                         const wxPoint& pos,
 437                         const wxSize& size,
 438                         const wxArrayString& choices,
 439                         long style,
 440                         const wxValidator& validator,
 441                         const wxString& name)
 442 {
 443     wxCArrayString chs(choices);
 444     return Create(parent, id, value, pos, size, chs.GetCount(),
 445                   chs.GetStrings(), style, validator, name);
 446 }
 447
 448 WXDWORD wxComboBox::MSWGetStyle(long style, WXDWORD *exstyle) const
 449 {
 450     // we never have an external border
 451     WXDWORD msStyle = wxChoice::MSWGetStyle
 452                       (
 453                         (style & ~wxBORDER_MASK) | wxBORDER_NONE, exstyle
 454                       );
 455
 456     // usually WS_TABSTOP is added by wxControl::MSWGetStyle() but as we're
 457     // created hidden (see Create() above), it is not done for us but we still
 458     // want to have this style
 459     msStyle |= WS_TABSTOP;
 460
 461     // remove the style always added by wxChoice
 462     msStyle &= ~CBS_DROPDOWNLIST;
 463
 464     if ( style & wxCB_READONLY )
 465         msStyle |= CBS_DROPDOWNLIST;
 466 #ifndef __WXWINCE__
 467     else if ( style & wxCB_SIMPLE )
 468         msStyle |= CBS_SIMPLE; // A list (shown always) and edit control
 469 #endif
 470     else
 471         msStyle |= CBS_DROPDOWN;
 472
 473     // there is no reason to not always use CBS_AUTOHSCROLL, so do use it
 474     msStyle |= CBS_AUTOHSCROLL;
 475
 476     // NB: we used to also add CBS_NOINTEGRALHEIGHT here but why?
 477
 478     return msStyle;
 479 }
 480
 481 // ----------------------------------------------------------------------------
 482 // wxComboBox text control-like methods
 483 // ----------------------------------------------------------------------------
 484
 485 wxString wxComboBox::GetValue() const
 486 {
 487     return wxGetWindowText(m_hWnd);
 488 }
 489
 490 void wxComboBox::SetValue(const wxString& value)
 491 {
 492     if ( HasFlag(wxCB_READONLY) )
 493         SetStringSelection(value);
 494     else
 495         SetWindowText(GetHwnd(), value.c_str());
 496 }
 497
 498 // Clipboard operations
 499 void wxComboBox::Copy()
 500 {
 501     SendMessage(GetHwnd(), WM_COPY, 0, 0L);
 502 }
 503
 504 void wxComboBox::Cut()
 505 {
 506     SendMessage(GetHwnd(), WM_CUT, 0, 0L);
 507 }
 508
 509 void wxComboBox::Paste()
 510 {
 511     SendMessage(GetHwnd(), WM_PASTE, 0, 0L);
 512 }
 513
 514 void wxComboBox::Undo()
 515 {
 516     if (CanUndo())
 517     {
 518         HWND hEditWnd = (HWND) GetEditHWND();
 519         if ( hEditWnd )
 520             ::SendMessage(hEditWnd, EM_UNDO, 0, 0);
 521     }
 522 }
 523
 524 void wxComboBox::Redo()
 525 {
 526     if (CanUndo())
 527     {
 528         // Same as Undo, since Undo undoes the undo, i.e. a redo.
 529         HWND hEditWnd = (HWND) GetEditHWND();
 530         if ( hEditWnd )
 531             ::SendMessage(hEditWnd, EM_UNDO, 0, 0);
 532     }
 533 }
 534
 535 void wxComboBox::SelectAll()
 536 {
 537     SetSelection(0, GetLastPosition());
 538 }
 539
 540 bool wxComboBox::CanUndo() const
 541 {
 542     if (!IsEditable())
 543         return false;
 544
 545     HWND hEditWnd = (HWND) GetEditHWND();
 546     if ( hEditWnd )
 547         return ::SendMessage(hEditWnd, EM_CANUNDO, 0, 0) != 0;
 548     else
 549         return false;
 550 }
 551
 552 bool wxComboBox::CanRedo() const
 553 {
 554     if (!IsEditable())
 555         return false;
 556
 557     HWND hEditWnd = (HWND) GetEditHWND();
 558     if ( hEditWnd )
 559         return ::SendMessage(hEditWnd, EM_CANUNDO, 0, 0) != 0;
 560     else
 561         return false;
 562 }
 563
 564 bool wxComboBox::HasSelection() const
 565 {
 566     long from, to;
 567     GetSelection(&from, &to);
 568     return from != to;
 569 }
 570
 571 bool wxComboBox::CanCopy() const
 572 {
 573     // Can copy if there's a selection
 574     return HasSelection();
 575 }
 576
 577 bool wxComboBox::CanCut() const
 578 {
 579     return IsEditable() && CanCopy();
 580 }
 581
 582 bool wxComboBox::CanPaste() const
 583 {
 584     if ( !IsEditable() )
 585         return false;
 586
 587     // Standard edit control: check for straight text on clipboard
 588     if ( !::OpenClipboard(GetHwndOf(wxTheApp->GetTopWindow())) )
 589         return false;
 590
 591     bool isTextAvailable = ::IsClipboardFormatAvailable(CF_TEXT) != 0;
 592     ::CloseClipboard();
 593
 594     return isTextAvailable;
 595 }
 596
 597 bool wxComboBox::IsEditable() const
 598 {
 599     return !HasFlag(wxCB_READONLY);
 600 }
 601
 602 void wxComboBox::SetEditable(bool WXUNUSED(editable))
 603 {
 604   // Can't implement in MSW?
 605 //  HWND hWnd = GetHwnd();
 606 //  SendMessage(hWnd, EM_SETREADONLY, (WPARAM)!editable, (LPARAM)0L);
 607 }
 608
 609 void wxComboBox::SetInsertionPoint(long pos)
 610 {
 611     if ( GetWindowStyle() & wxCB_READONLY )
 612         return;
 613
 614 #ifdef __WIN32__
 615     HWND hWnd = GetHwnd();
 616     ::SendMessage(hWnd, CB_SETEDITSEL, 0, MAKELPARAM(pos, pos));
 617     HWND hEditWnd = (HWND) GetEditHWND();
 618     if ( hEditWnd )
 619     {
 620         // Scroll insertion point into view
 621         SendMessage(hEditWnd, EM_SCROLLCARET, (WPARAM)0, (LPARAM)0);
 622         // Why is this necessary? (Copied from wxTextCtrl::SetInsertionPoint)
 623         SendMessage(hEditWnd, EM_REPLACESEL, 0, (LPARAM) wxEmptyString);
 624     }
 625 #endif // __WIN32__
 626 }
 627
 628 void wxComboBox::SetInsertionPointEnd()
 629 {
 630     // setting insertion point doesn't make sense for read only comboboxes
 631     if ( !(GetWindowStyle() & wxCB_READONLY) )
 632     {
 633         wxTextPos pos = GetLastPosition();
 634         SetInsertionPoint(pos);
 635     }
 636 }
 637
 638 long wxComboBox::GetInsertionPoint() const
 639 {
 640     // CB_GETEDITSEL returns the index of the first character of the selection in
 641     // its low-order word
 642     DWORD pos= (DWORD)::SendMessage(GetHwnd(), CB_GETEDITSEL, 0, 0L);
 643     return LOWORD(pos);
 644 }
 645
 646 wxTextPos wxComboBox::GetLastPosition() const
 647 {
 648     HWND hEditWnd = (HWND) GetEditHWND();
 649
 650     // Get number of characters in the last (only) line. We'll add this to the character
 651     // index for the last line, 1st position.
 652     wxTextPos lineLength = (wxTextPos)SendMessage(hEditWnd, EM_LINELENGTH, (WPARAM) 0, (LPARAM)0L);
 653
 654     return lineLength;
 655 }
 656
 657 void wxComboBox::Replace(long from, long to, const wxString& value)
 658 {
 659 #if wxUSE_CLIPBOARD
 660     Remove(from, to);
 661
 662     // Now replace with 'value', by pasting.
 663     wxSetClipboardData(wxDF_TEXT, (wxObject *)(const wxChar *)value, 0, 0);
 664
 665     // Paste into edit control
 666     SendMessage(GetHwnd(), WM_PASTE, (WPARAM)0, (LPARAM)0L);
 667 #else
 668     wxUnusedVar(from);
 669     wxUnusedVar(to);
 670     wxUnusedVar(value);
 671 #endif
 672 }
 673
 674 void wxComboBox::Remove(long from, long to)
 675 {
 676     // Set selection and remove it
 677     SetSelection(from, to);
 678     SendMessage(GetHwnd(), WM_CUT, (WPARAM)0, (LPARAM)0);
 679 }
 680
 681 void wxComboBox::SetSelection(long from, long to)
 682 {
 683     // if from and to are both -1, it means (in wxWidgets) that all text should
 684     // be selected, translate this into Windows convention
 685     if ( (from == -1) && (to == -1) )
 686     {
 687         from = 0;
 688     }
 689
 690     if ( SendMessage(GetHwnd(), CB_SETEDITSEL,
 691                      0, (LPARAM)MAKELONG(from, to)) == CB_ERR )
 692     {
 693         wxLogDebug(_T("CB_SETEDITSEL failed"));
 694     }
 695 }
 696
 697 void wxComboBox::GetSelection(long* from, long* to) const
 698 {
 699     DWORD dwStart, dwEnd;
 700     if ( ::SendMessage(GetHwnd(), CB_GETEDITSEL,
 701                        (WPARAM)&dwStart, (LPARAM)&dwEnd) == CB_ERR )
 702     {
 703         *from =
 704         *to = 0;
 705     }
 706     else
 707     {
 708         *from = dwStart;
 709         *to = dwEnd;
 710     }
 711 }
 712
 713 // ----------------------------------------------------------------------------
 714 // standard event handling
 715 // ----------------------------------------------------------------------------
 716
 717 void wxComboBox::OnCut(wxCommandEvent& WXUNUSED(event))
 718 {
 719     Cut();
 720 }
 721
 722 void wxComboBox::OnCopy(wxCommandEvent& WXUNUSED(event))
 723 {
 724     Copy();
 725 }
 726
 727 void wxComboBox::OnPaste(wxCommandEvent& WXUNUSED(event))
 728 {
 729     Paste();
 730 }
 731
 732 void wxComboBox::OnUndo(wxCommandEvent& WXUNUSED(event))
 733 {
 734     Undo();
 735 }
 736
 737 void wxComboBox::OnRedo(wxCommandEvent& WXUNUSED(event))
 738 {
 739     Redo();
 740 }
 741
 742 void wxComboBox::OnDelete(wxCommandEvent& WXUNUSED(event))
 743 {
 744     long from, to;
 745     GetSelection(& from, & to);
 746     if (from != -1 && to != -1)
 747         Remove(from, to);
 748 }
 749
 750 void wxComboBox::OnSelectAll(wxCommandEvent& WXUNUSED(event))
 751 {
 752     SetSelection(-1, -1);
 753 }
 754
 755 void wxComboBox::OnUpdateCut(wxUpdateUIEvent& event)
 756 {
 757     event.Enable( CanCut() );
 758 }
 759
 760 void wxComboBox::OnUpdateCopy(wxUpdateUIEvent& event)
 761 {
 762     event.Enable( CanCopy() );
 763 }
 764
 765 void wxComboBox::OnUpdatePaste(wxUpdateUIEvent& event)
 766 {
 767     event.Enable( CanPaste() );
 768 }
 769
 770 void wxComboBox::OnUpdateUndo(wxUpdateUIEvent& event)
 771 {
 772     event.Enable( CanUndo() );
 773 }
 774
 775 void wxComboBox::OnUpdateRedo(wxUpdateUIEvent& event)
 776 {
 777     event.Enable( CanRedo() );
 778 }
 779
 780 void wxComboBox::OnUpdateDelete(wxUpdateUIEvent& event)
 781 {
 782     event.Enable(HasSelection() && IsEditable());
 783 }
 784
 785 void wxComboBox::OnUpdateSelectAll(wxUpdateUIEvent& event)
 786 {
 787     event.Enable(GetLastPosition() > 0);
 788 }
 789
 790 #endif // wxUSE_COMBOBOX