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 WXUNUSED(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
 403     // there is no return value for the CBN_ notifications, so always return
 404     // false from here to pass the message to DefWindowProc()
 405     return false;
 406 }
 407
 408 WXHWND wxComboBox::GetEditHWND() const
 409 {
 410     // this function should not be called for wxCB_READONLY controls, it is
 411     // the callers responsability to check this
 412     wxASSERT_MSG( !(GetWindowStyle() & wxCB_READONLY),
 413                   _T("read-only combobox doesn't have any edit control") );
 414
 415     POINT pt;
 416     pt.x = pt.y = 4;
 417     HWND hwndEdit = ::ChildWindowFromPoint(GetHwnd(), pt);
 418     if ( !hwndEdit || hwndEdit == GetHwnd() )
 419     {
 420         wxFAIL_MSG(_T("not read only combobox without edit control?"));
 421     }
 422
 423     return (WXHWND)hwndEdit;
 424 }
 425
 426 // ----------------------------------------------------------------------------
 427 // wxComboBox creation
 428 // ----------------------------------------------------------------------------
 429
 430 bool wxComboBox::Create(wxWindow *parent, wxWindowID id,
 431                         const wxString& value,
 432                         const wxPoint& pos,
 433                         const wxSize& size,
 434                         int n, const wxString choices[],
 435                         long style,
 436                         const wxValidator& validator,
 437                         const wxString& name)
 438 {
 439     // pretend that wxComboBox is hidden while it is positioned and resized and
 440     // show it only right before leaving this method because otherwise there is
 441     // some noticeable flicker while the control rearranges itself
 442     m_isShown = false;
 443
 444     if ( !CreateAndInit(parent, id, pos, size, n, choices, style,
 445                         validator, name) )
 446         return false;
 447
 448     // we shouldn't call SetValue() for an empty string because this would
 449     // (correctly) result in an assert with a read only combobox and is useless
 450     // for the other ones anyhow
 451     if ( !value.empty() )
 452         SetValue(value);
 453
 454     // a (not read only) combobox is, in fact, 2 controls: the combobox itself
 455     // and an edit control inside it and if we want to catch events from this
 456     // edit control, we must subclass it as well
 457     if ( !(style & wxCB_READONLY) )
 458     {
 459         gs_wndprocEdit = wxSetWindowProc((HWND)GetEditHWND(),
 460                                          wxComboEditWndProc);
 461     }
 462
 463     // and finally, show the control
 464     Show(true);
 465
 466     return true;
 467 }
 468
 469 bool wxComboBox::Create(wxWindow *parent, wxWindowID id,
 470                         const wxString& value,
 471                         const wxPoint& pos,
 472                         const wxSize& size,
 473                         const wxArrayString& choices,
 474                         long style,
 475                         const wxValidator& validator,
 476                         const wxString& name)
 477 {
 478     wxCArrayString chs(choices);
 479     return Create(parent, id, value, pos, size, chs.GetCount(),
 480                   chs.GetStrings(), style, validator, name);
 481 }
 482
 483 WXDWORD wxComboBox::MSWGetStyle(long style, WXDWORD *exstyle) const
 484 {
 485     // we never have an external border
 486     WXDWORD msStyle = wxChoice::MSWGetStyle
 487                       (
 488                         (style & ~wxBORDER_MASK) | wxBORDER_NONE, exstyle
 489                       );
 490
 491     // usually WS_TABSTOP is added by wxControl::MSWGetStyle() but as we're
 492     // created hidden (see Create() above), it is not done for us but we still
 493     // want to have this style
 494     msStyle |= WS_TABSTOP;
 495
 496     // remove the style always added by wxChoice
 497     msStyle &= ~CBS_DROPDOWNLIST;
 498
 499     if ( style & wxCB_READONLY )
 500         msStyle |= CBS_DROPDOWNLIST;
 501 #ifndef __WXWINCE__
 502     else if ( style & wxCB_SIMPLE )
 503         msStyle |= CBS_SIMPLE; // A list (shown always) and edit control
 504 #endif
 505     else
 506         msStyle |= CBS_DROPDOWN;
 507
 508     // there is no reason to not always use CBS_AUTOHSCROLL, so do use it
 509     msStyle |= CBS_AUTOHSCROLL;
 510
 511     // NB: we used to also add CBS_NOINTEGRALHEIGHT here but why?
 512
 513     return msStyle;
 514 }
 515
 516 // ----------------------------------------------------------------------------
 517 // wxComboBox text control-like methods
 518 // ----------------------------------------------------------------------------
 519
 520 void wxComboBox::SetValue(const wxString& value)
 521 {
 522     if ( HasFlag(wxCB_READONLY) )
 523         SetStringSelection(value);
 524     else
 525         SetWindowText(GetHwnd(), value.c_str());
 526
 527     m_value = value;
 528     m_selectionOld = GetSelection();
 529 }
 530
 531 // Clipboard operations
 532 void wxComboBox::Copy()
 533 {
 534     SendMessage(GetHwnd(), WM_COPY, 0, 0L);
 535 }
 536
 537 void wxComboBox::Cut()
 538 {
 539     SendMessage(GetHwnd(), WM_CUT, 0, 0L);
 540 }
 541
 542 void wxComboBox::Paste()
 543 {
 544     SendMessage(GetHwnd(), WM_PASTE, 0, 0L);
 545 }
 546
 547 void wxComboBox::Undo()
 548 {
 549     if (CanUndo())
 550     {
 551         HWND hEditWnd = (HWND) GetEditHWND() ;
 552         if ( hEditWnd )
 553             ::SendMessage(hEditWnd, EM_UNDO, 0, 0);
 554     }
 555 }
 556
 557 void wxComboBox::Redo()
 558 {
 559     if (CanUndo())
 560     {
 561         // Same as Undo, since Undo undoes the undo, i.e. a redo.
 562         HWND hEditWnd = (HWND) GetEditHWND() ;
 563         if ( hEditWnd )
 564             ::SendMessage(hEditWnd, EM_UNDO, 0, 0);
 565     }
 566 }
 567
 568 void wxComboBox::SelectAll()
 569 {
 570     SetSelection(0, GetLastPosition());
 571 }
 572
 573 bool wxComboBox::CanUndo() const
 574 {
 575     if (!IsEditable())
 576         return false;
 577
 578     HWND hEditWnd = (HWND) GetEditHWND() ;
 579     if ( hEditWnd )
 580         return ::SendMessage(hEditWnd, EM_CANUNDO, 0, 0) != 0;
 581     else
 582         return false;
 583 }
 584
 585 bool wxComboBox::CanRedo() const
 586 {
 587     if (!IsEditable())
 588         return false;
 589
 590     HWND hEditWnd = (HWND) GetEditHWND() ;
 591     if ( hEditWnd )
 592         return ::SendMessage(hEditWnd, EM_CANUNDO, 0, 0) != 0;
 593     else
 594         return false;
 595 }
 596
 597 bool wxComboBox::HasSelection() const
 598 {
 599     long from, to;
 600     GetSelection(&from, &to);
 601     return from != to;
 602 }
 603
 604 bool wxComboBox::CanCopy() const
 605 {
 606     // Can copy if there's a selection
 607     return HasSelection();
 608 }
 609
 610 bool wxComboBox::CanCut() const
 611 {
 612     return IsEditable() && CanCopy() ;
 613 }
 614
 615 bool wxComboBox::CanPaste() const
 616 {
 617     if ( !IsEditable() )
 618         return false;
 619
 620     // Standard edit control: check for straight text on clipboard
 621     if ( !::OpenClipboard(GetHwndOf(wxTheApp->GetTopWindow())) )
 622         return false;
 623
 624     bool isTextAvailable = ::IsClipboardFormatAvailable(CF_TEXT) != 0;
 625     ::CloseClipboard();
 626
 627     return isTextAvailable;
 628 }
 629
 630 bool wxComboBox::IsEditable() const
 631 {
 632     return !HasFlag(wxCB_READONLY);
 633 }
 634
 635 void wxComboBox::SetEditable(bool WXUNUSED(editable))
 636 {
 637   // Can't implement in MSW?
 638 //  HWND hWnd = GetHwnd();
 639 //  SendMessage(hWnd, EM_SETREADONLY, (WPARAM)!editable, (LPARAM)0L);
 640 }
 641
 642 void wxComboBox::SetInsertionPoint(long pos)
 643 {
 644     if ( GetWindowStyle() & wxCB_READONLY )
 645         return;
 646
 647 #ifdef __WIN32__
 648     HWND hWnd = GetHwnd();
 649     ::SendMessage(hWnd, CB_SETEDITSEL, 0, MAKELPARAM(pos, pos));
 650     HWND hEditWnd = (HWND) GetEditHWND() ;
 651     if ( hEditWnd )
 652     {
 653         // Scroll insertion point into view
 654         SendMessage(hEditWnd, EM_SCROLLCARET, (WPARAM)0, (LPARAM)0);
 655         // Why is this necessary? (Copied from wxTextCtrl::SetInsertionPoint)
 656         SendMessage(hEditWnd, EM_REPLACESEL, 0, (LPARAM) wxEmptyString);
 657     }
 658 #endif // __WIN32__
 659 }
 660
 661 void wxComboBox::SetInsertionPointEnd()
 662 {
 663     // setting insertion point doesn't make sense for read only comboboxes
 664     if ( !(GetWindowStyle() & wxCB_READONLY) )
 665     {
 666         wxTextPos pos = GetLastPosition();
 667         SetInsertionPoint(pos);
 668     }
 669 }
 670
 671 long wxComboBox::GetInsertionPoint() const
 672 {
 673     // CB_GETEDITSEL returns the index of the first character of the selection in
 674     // its low-order word
 675     DWORD pos= (DWORD)::SendMessage(GetHwnd(), CB_GETEDITSEL, 0, 0L);
 676     return LOWORD(pos);
 677 }
 678
 679 wxTextPos wxComboBox::GetLastPosition() const
 680 {
 681     HWND hEditWnd = (HWND) GetEditHWND();
 682
 683     // Get number of characters in the last (only) line. We'll add this to the character
 684     // index for the last line, 1st position.
 685     wxTextPos lineLength = (wxTextPos)SendMessage(hEditWnd, EM_LINELENGTH, (WPARAM) 0, (LPARAM)0L);
 686
 687     return lineLength;
 688 }
 689
 690 void wxComboBox::Replace(long from, long to, const wxString& value)
 691 {
 692 #if wxUSE_CLIPBOARD
 693     Remove(from, to);
 694
 695     // Now replace with 'value', by pasting.
 696     wxSetClipboardData(wxDF_TEXT, (wxObject *)(const wxChar *)value, 0, 0);
 697
 698     // Paste into edit control
 699     SendMessage(GetHwnd(), WM_PASTE, (WPARAM)0, (LPARAM)0L);
 700 #endif
 701 }
 702
 703 void wxComboBox::Remove(long from, long to)
 704 {
 705     // Set selection and remove it
 706     SetSelection(from, to);
 707     SendMessage(GetHwnd(), WM_CUT, (WPARAM)0, (LPARAM)0);
 708 }
 709
 710 void wxComboBox::SetSelection(long from, long to)
 711 {
 712     // if from and to are both -1, it means (in wxWidgets) that all text should
 713     // be selected, translate this into Windows convention
 714     if ( (from == -1) && (to == -1) )
 715     {
 716         from = 0;
 717     }
 718
 719     if ( SendMessage(GetHwnd(), CB_SETEDITSEL,
 720                      0, (LPARAM)MAKELONG(from, to)) == CB_ERR )
 721     {
 722         wxLogDebug(_T("CB_SETEDITSEL failed"));
 723     }
 724 }
 725
 726 void wxComboBox::GetSelection(long* from, long* to) const
 727 {
 728     DWORD dwStart, dwEnd;
 729     if ( ::SendMessage(GetHwnd(), CB_GETEDITSEL,
 730                        (WPARAM)&dwStart, (LPARAM)&dwEnd) == CB_ERR )
 731     {
 732         *from =
 733         *to = 0;
 734     }
 735     else
 736     {
 737         *from = dwStart;
 738         *to = dwEnd;
 739     }
 740 }
 741
 742 int wxComboBox::GetSelection() const
 743 {
 744     return wxChoice::GetSelection();
 745 }
 746
 747 // ----------------------------------------------------------------------------
 748 // standard event handling
 749 // ----------------------------------------------------------------------------
 750
 751 void wxComboBox::OnCut(wxCommandEvent& WXUNUSED(event))
 752 {
 753     Cut();
 754 }
 755
 756 void wxComboBox::OnCopy(wxCommandEvent& WXUNUSED(event))
 757 {
 758     Copy();
 759 }
 760
 761 void wxComboBox::OnPaste(wxCommandEvent& WXUNUSED(event))
 762 {
 763     Paste();
 764 }
 765
 766 void wxComboBox::OnUndo(wxCommandEvent& WXUNUSED(event))
 767 {
 768     Undo();
 769 }
 770
 771 void wxComboBox::OnRedo(wxCommandEvent& WXUNUSED(event))
 772 {
 773     Redo();
 774 }
 775
 776 void wxComboBox::OnDelete(wxCommandEvent& WXUNUSED(event))
 777 {
 778     long from, to;
 779     GetSelection(& from, & to);
 780     if (from != -1 && to != -1)
 781         Remove(from, to);
 782 }
 783
 784 void wxComboBox::OnSelectAll(wxCommandEvent& WXUNUSED(event))
 785 {
 786     SetSelection(-1, -1);
 787 }
 788
 789 void wxComboBox::OnUpdateCut(wxUpdateUIEvent& event)
 790 {
 791     event.Enable( CanCut() );
 792 }
 793
 794 void wxComboBox::OnUpdateCopy(wxUpdateUIEvent& event)
 795 {
 796     event.Enable( CanCopy() );
 797 }
 798
 799 void wxComboBox::OnUpdatePaste(wxUpdateUIEvent& event)
 800 {
 801     event.Enable( CanPaste() );
 802 }
 803
 804 void wxComboBox::OnUpdateUndo(wxUpdateUIEvent& event)
 805 {
 806     event.Enable( CanUndo() );
 807 }
 808
 809 void wxComboBox::OnUpdateRedo(wxUpdateUIEvent& event)
 810 {
 811     event.Enable( CanRedo() );
 812 }
 813
 814 void wxComboBox::OnUpdateDelete(wxUpdateUIEvent& event)
 815 {
 816     event.Enable(HasSelection() && IsEditable()) ;
 817 }
 818
 819 void wxComboBox::OnUpdateSelectAll(wxUpdateUIEvent& event)
 820 {
 821     event.Enable(GetLastPosition() > 0);
 822 }
 823
 824 #endif // wxUSE_COMBOBOX
 825