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