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 #include "wx/combobox.h"
  30
  31 #ifndef WX_PRECOMP
  32     #include "wx/settings.h"
  33     #include "wx/log.h"
  34     // for wxEVT_COMMAND_TEXT_ENTER
  35     #include "wx/textctrl.h"
  36     #include "wx/app.h"
  37     #include "wx/brush.h"
  38 #endif
  39
  40 #include "wx/clipbrd.h"
  41 #include "wx/msw/private.h"
  42
  43 // include <commctrl.h> "properly"
  44 #include "wx/msw/wrapcctl.h"
  45 #include "wx/msw/wrapshl.h"
  46
  47 #if wxUSE_TOOLTIPS
  48     #include "wx/tooltip.h"
  49 #endif // wxUSE_TOOLTIPS
  50
  51 // ----------------------------------------------------------------------------
  52 // wxWin macros
  53 // ----------------------------------------------------------------------------
  54
  55 #if wxUSE_EXTENDED_RTTI
  56 WX_DEFINE_FLAGS( wxComboBoxStyle )
  57
  58 wxBEGIN_FLAGS( wxComboBoxStyle )
  59     // new style border flags, we put them first to
  60     // use them for streaming out
  61     wxFLAGS_MEMBER(wxBORDER_SIMPLE)
  62     wxFLAGS_MEMBER(wxBORDER_SUNKEN)
  63     wxFLAGS_MEMBER(wxBORDER_DOUBLE)
  64     wxFLAGS_MEMBER(wxBORDER_RAISED)
  65     wxFLAGS_MEMBER(wxBORDER_STATIC)
  66     wxFLAGS_MEMBER(wxBORDER_NONE)
  67
  68     // old style border flags
  69     wxFLAGS_MEMBER(wxSIMPLE_BORDER)
  70     wxFLAGS_MEMBER(wxSUNKEN_BORDER)
  71     wxFLAGS_MEMBER(wxDOUBLE_BORDER)
  72     wxFLAGS_MEMBER(wxRAISED_BORDER)
  73     wxFLAGS_MEMBER(wxSTATIC_BORDER)
  74     wxFLAGS_MEMBER(wxBORDER)
  75
  76     // standard window styles
  77     wxFLAGS_MEMBER(wxTAB_TRAVERSAL)
  78     wxFLAGS_MEMBER(wxCLIP_CHILDREN)
  79     wxFLAGS_MEMBER(wxTRANSPARENT_WINDOW)
  80     wxFLAGS_MEMBER(wxWANTS_CHARS)
  81     wxFLAGS_MEMBER(wxFULL_REPAINT_ON_RESIZE)
  82     wxFLAGS_MEMBER(wxALWAYS_SHOW_SB )
  83     wxFLAGS_MEMBER(wxVSCROLL)
  84     wxFLAGS_MEMBER(wxHSCROLL)
  85
  86     wxFLAGS_MEMBER(wxCB_SIMPLE)
  87     wxFLAGS_MEMBER(wxCB_SORT)
  88     wxFLAGS_MEMBER(wxCB_READONLY)
  89     wxFLAGS_MEMBER(wxCB_DROPDOWN)
  90
  91 wxEND_FLAGS( wxComboBoxStyle )
  92
  93 IMPLEMENT_DYNAMIC_CLASS_XTI(wxComboBox, wxControl,"wx/combobox.h")
  94
  95 wxBEGIN_PROPERTIES_TABLE(wxComboBox)
  96     wxEVENT_PROPERTY( Select , wxEVT_COMMAND_COMBOBOX_SELECTED , wxCommandEvent )
  97     wxEVENT_PROPERTY( TextEnter , wxEVT_COMMAND_TEXT_ENTER , wxCommandEvent )
  98
  99     // TODO DELEGATES
 100     wxPROPERTY( Font , wxFont , SetFont , GetFont  , EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
 101     wxPROPERTY_COLLECTION( Choices , wxArrayString , wxString , AppendString , GetStrings , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
 102     wxPROPERTY( Value ,wxString, SetValue, GetValue, EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
 103     wxPROPERTY( Selection ,int, SetSelection, GetSelection, EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
 104     wxPROPERTY_FLAGS( WindowStyle , wxComboBoxStyle , long , SetWindowStyleFlag , GetWindowStyleFlag , EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group")) // style
 105 wxEND_PROPERTIES_TABLE()
 106
 107 wxBEGIN_HANDLERS_TABLE(wxComboBox)
 108 wxEND_HANDLERS_TABLE()
 109
 110 wxCONSTRUCTOR_5( wxComboBox , wxWindow* , Parent , wxWindowID , Id , wxString , Value , wxPoint , Position , wxSize , Size )
 111
 112 #else
 113
 114 IMPLEMENT_DYNAMIC_CLASS(wxComboBox, wxControl)
 115
 116 #endif
 117
 118 BEGIN_EVENT_TABLE(wxComboBox, wxControl)
 119     EVT_MENU(wxID_CUT, wxComboBox::OnCut)
 120     EVT_MENU(wxID_COPY, wxComboBox::OnCopy)
 121     EVT_MENU(wxID_PASTE, wxComboBox::OnPaste)
 122     EVT_MENU(wxID_UNDO, wxComboBox::OnUndo)
 123     EVT_MENU(wxID_REDO, wxComboBox::OnRedo)
 124     EVT_MENU(wxID_CLEAR, wxComboBox::OnDelete)
 125     EVT_MENU(wxID_SELECTALL, wxComboBox::OnSelectAll)
 126
 127     EVT_UPDATE_UI(wxID_CUT, wxComboBox::OnUpdateCut)
 128     EVT_UPDATE_UI(wxID_COPY, wxComboBox::OnUpdateCopy)
 129     EVT_UPDATE_UI(wxID_PASTE, wxComboBox::OnUpdatePaste)
 130     EVT_UPDATE_UI(wxID_UNDO, wxComboBox::OnUpdateUndo)
 131     EVT_UPDATE_UI(wxID_REDO, wxComboBox::OnUpdateRedo)
 132     EVT_UPDATE_UI(wxID_CLEAR, wxComboBox::OnUpdateDelete)
 133     EVT_UPDATE_UI(wxID_SELECTALL, wxComboBox::OnUpdateSelectAll)
 134 END_EVENT_TABLE()
 135
 136 // ----------------------------------------------------------------------------
 137 // function prototypes
 138 // ----------------------------------------------------------------------------
 139
 140 LRESULT APIENTRY _EXPORT wxComboEditWndProc(HWND hWnd,
 141                                             UINT message,
 142                                             WPARAM wParam,
 143                                             LPARAM lParam);
 144
 145 // ---------------------------------------------------------------------------
 146 // global vars
 147 // ---------------------------------------------------------------------------
 148
 149 // the pointer to standard radio button wnd proc
 150 static WNDPROC gs_wndprocEdit = (WNDPROC)NULL;
 151
 152 // ============================================================================
 153 // implementation
 154 // ============================================================================
 155
 156 // ----------------------------------------------------------------------------
 157 // wnd proc for subclassed edit control
 158 // ----------------------------------------------------------------------------
 159
 160 LRESULT APIENTRY _EXPORT wxComboEditWndProc(HWND hWnd,
 161                                             UINT message,
 162                                             WPARAM wParam,
 163                                             LPARAM lParam)
 164 {
 165     HWND hwndCombo = ::GetParent(hWnd);
 166     wxWindow *win = wxFindWinFromHandle((WXHWND)hwndCombo);
 167
 168     switch ( message )
 169     {
 170         // forward some messages to the combobox to generate the appropriate
 171         // wxEvents from them
 172         case WM_KEYUP:
 173         case WM_KEYDOWN:
 174         case WM_CHAR:
 175         case WM_SYSCHAR:
 176         case WM_SYSKEYDOWN:
 177         case WM_SYSKEYUP:
 178         case WM_SETFOCUS:
 179         case WM_KILLFOCUS:
 180             {
 181                 wxComboBox *combo = wxDynamicCast(win, wxComboBox);
 182                 if ( !combo )
 183                 {
 184                     // we can get WM_KILLFOCUS while our parent is already half
 185                     // destroyed and hence doesn't look like a combobx any
 186                     // longer, check for it to avoid bogus assert failures
 187                     if ( !win->IsBeingDeleted() )
 188                     {
 189                         wxFAIL_MSG( _T("should have combo as parent") );
 190                     }
 191                 }
 192                 else if ( combo->MSWProcessEditMsg(message, wParam, lParam) )
 193                 {
 194                     // handled by parent
 195                     return 0;
 196                 }
 197             }
 198             break;
 199
 200         case WM_GETDLGCODE:
 201             {
 202                 wxCHECK_MSG( win, 0, _T("should have a parent") );
 203
 204                 if ( win->GetWindowStyle() & wxTE_PROCESS_ENTER )
 205                 {
 206                     // need to return a custom dlg code or we'll never get it
 207                     return DLGC_WANTMESSAGE;
 208                 }
 209             }
 210             break;
 211
 212         case WM_CUT:
 213         case WM_COPY:
 214         case WM_PASTE:
 215             if( win->HandleClipboardEvent( message ) )
 216                 return 0;
 217             break;
 218     }
 219
 220     return ::CallWindowProc(CASTWNDPROC gs_wndprocEdit, hWnd, message, wParam, lParam);
 221 }
 222
 223 // ----------------------------------------------------------------------------
 224 // wxComboBox callbacks
 225 // ----------------------------------------------------------------------------
 226
 227 WXLRESULT wxComboBox::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam)
 228 {
 229     // TODO: handle WM_CTLCOLOR messages from our EDIT control to be able to
 230     //       set its colour correctly (to be the same as our own one)
 231
 232     switch ( nMsg )
 233     {
 234         case WM_SIZE:
 235         // wxStaticBox can generate this message, when modifying the control's style.
 236         // This causes the content of the combobox to be selected, for some reason.
 237         case WM_STYLECHANGED:
 238             {
 239                 // combobox selection sometimes spontaneously changes when its
 240                 // size changes, restore it to the old value if necessary
 241                 long fromOld, toOld;
 242                 GetSelection(&fromOld, &toOld);
 243                 WXLRESULT result = wxChoice::MSWWindowProc(nMsg, wParam, lParam);
 244
 245                 long fromNew, toNew;
 246                 GetSelection(&fromNew, &toNew);
 247
 248                 if ( fromOld != fromNew || toOld != toNew )
 249                 {
 250                     SetSelection(fromOld, toOld);
 251                 }
 252
 253                 return result;
 254             }
 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
 271                 const int sel = GetSelection();
 272                 event.SetInt(sel);
 273                 event.SetString(GetValue());
 274                 InitCommandEventWithItems(event, sel);
 275
 276                 if ( ProcessCommand(event) )
 277                 {
 278                     // don't let the event through to the native control
 279                     // because it doesn't need it and may generate an annoying
 280                     // beep if it gets it
 281                     return true;
 282                 }
 283             }
 284             // fall through
 285
 286         case WM_SYSCHAR:
 287             return HandleChar(wParam, lParam, true /* isASCII */);
 288
 289         case WM_SYSKEYDOWN:
 290         case WM_KEYDOWN:
 291             return HandleKeyDown(wParam, lParam);
 292
 293         case WM_SYSKEYUP:
 294         case WM_KEYUP:
 295             return HandleKeyUp(wParam, lParam);
 296
 297         case WM_SETFOCUS:
 298             return HandleSetFocus((WXHWND)wParam);
 299
 300         case WM_KILLFOCUS:
 301             return HandleKillFocus((WXHWND)wParam);
 302     }
 303
 304     return false;
 305 }
 306
 307 bool wxComboBox::MSWCommand(WXUINT param, WXWORD id)
 308 {
 309     int sel = -1;
 310     wxString value;
 311
 312     switch ( param )
 313     {
 314         case CBN_SELENDOK:
 315 #ifndef __SMARTPHONE__
 316             // we need to reset this to prevent the selection from being undone
 317             // by wxChoice, see wxChoice::MSWCommand() and comments there
 318             m_lastAcceptedSelection = wxID_NONE;
 319 #endif
 320
 321             // set these variables so that they could be also fixed in
 322             // CBN_EDITCHANGE below
 323             sel = GetSelection();
 324             value = GetStringSelection();
 325
 326             // this string is going to become the new combobox value soon but
 327             // we need it to be done right now, otherwise the event handler
 328             // could get a wrong value when it calls our GetValue()
 329             ::SetWindowText(GetHwnd(), value);
 330
 331             {
 332                 wxCommandEvent event(wxEVT_COMMAND_COMBOBOX_SELECTED, GetId());
 333                 event.SetInt(sel);
 334                 event.SetString(value);
 335                 InitCommandEventWithItems(event, sel);
 336
 337                 ProcessCommand(event);
 338             }
 339
 340             // fall through: for compability with wxGTK, also send the text
 341             // update event when the selection changes (this also seems more
 342             // logical as the text does change)
 343
 344         case CBN_EDITCHANGE:
 345             {
 346                 wxCommandEvent event(wxEVT_COMMAND_TEXT_UPDATED, GetId());
 347
 348                 // if sel != -1, value was already initialized above
 349                 if ( sel == -1 )
 350                 {
 351                     value = wxGetWindowText(GetHwnd());
 352                 }
 353
 354                 event.SetString(value);
 355                 InitCommandEventWithItems(event, sel);
 356
 357                 ProcessCommand(event);
 358             }
 359             break;
 360
 361         default:
 362             return wxChoice::MSWCommand(param, id);
 363     }
 364
 365     // skip wxChoice version as it would generate its own events for
 366     // CBN_SELENDOK
 367     return wxControl::MSWCommand(param, id);
 368 }
 369
 370 WXHWND wxComboBox::GetEditHWND() const
 371 {
 372     // this function should not be called for wxCB_READONLY controls, it is
 373     // the callers responsability to check this
 374     wxASSERT_MSG( !(GetWindowStyle() & wxCB_READONLY),
 375                   _T("read-only combobox doesn't have any edit control") );
 376
 377     POINT pt;
 378     pt.x = pt.y = 4;
 379     HWND hwndEdit = ::ChildWindowFromPoint(GetHwnd(), pt);
 380     if ( !hwndEdit || hwndEdit == GetHwnd() )
 381     {
 382         wxFAIL_MSG(_T("not read only combobox without edit control?"));
 383     }
 384
 385     return (WXHWND)hwndEdit;
 386 }
 387
 388 // ----------------------------------------------------------------------------
 389 // wxComboBox creation
 390 // ----------------------------------------------------------------------------
 391
 392 bool wxComboBox::Create(wxWindow *parent, wxWindowID id,
 393                         const wxString& value,
 394                         const wxPoint& pos,
 395                         const wxSize& size,
 396                         int n, const wxString choices[],
 397                         long style,
 398                         const wxValidator& validator,
 399                         const wxString& name)
 400 {
 401     // pretend that wxComboBox is hidden while it is positioned and resized and
 402     // show it only right before leaving this method because otherwise there is
 403     // some noticeable flicker while the control rearranges itself
 404     m_isShown = false;
 405
 406     if ( !CreateAndInit(parent, id, pos, size, n, choices, style,
 407                         validator, name) )
 408         return false;
 409
 410     // we shouldn't call SetValue() for an empty string because this would
 411     // (correctly) result in an assert with a read only combobox and is useless
 412     // for the other ones anyhow
 413     if ( !value.empty() )
 414         SetValue(value);
 415
 416     // a (not read only) combobox is, in fact, 2 controls: the combobox itself
 417     // and an edit control inside it and if we want to catch events from this
 418     // edit control, we must subclass it as well
 419     if ( !(style & wxCB_READONLY) )
 420     {
 421         const HWND hwndEdit = (HWND)GetEditHWND();
 422
 423         gs_wndprocEdit = wxSetWindowProc(hwndEdit, wxComboEditWndProc);
 424
 425         if ( style & wxCB_FILENAME )
 426         {
 427             wxEnableFileNameAutoComplete(hwndEdit);
 428         }
 429     }
 430
 431     // and finally, show the control
 432     Show(true);
 433
 434     return true;
 435 }
 436
 437 bool wxComboBox::Create(wxWindow *parent, wxWindowID id,
 438                         const wxString& value,
 439                         const wxPoint& pos,
 440                         const wxSize& size,
 441                         const wxArrayString& choices,
 442                         long style,
 443                         const wxValidator& validator,
 444                         const wxString& name)
 445 {
 446     wxCArrayString chs(choices);
 447     return Create(parent, id, value, pos, size, chs.GetCount(),
 448                   chs.GetStrings(), style, validator, name);
 449 }
 450
 451 WXDWORD wxComboBox::MSWGetStyle(long style, WXDWORD *exstyle) const
 452 {
 453     // we never have an external border
 454     WXDWORD msStyle = wxChoice::MSWGetStyle
 455                       (
 456                         (style & ~wxBORDER_MASK) | wxBORDER_NONE, exstyle
 457                       );
 458
 459     // usually WS_TABSTOP is added by wxControl::MSWGetStyle() but as we're
 460     // created hidden (see Create() above), it is not done for us but we still
 461     // want to have this style
 462     msStyle |= WS_TABSTOP;
 463
 464     // remove the style always added by wxChoice
 465     msStyle &= ~CBS_DROPDOWNLIST;
 466
 467     if ( style & wxCB_READONLY )
 468         msStyle |= CBS_DROPDOWNLIST;
 469 #ifndef __WXWINCE__
 470     else if ( style & wxCB_SIMPLE )
 471         msStyle |= CBS_SIMPLE; // A list (shown always) and edit control
 472 #endif
 473     else
 474         msStyle |= CBS_DROPDOWN;
 475
 476     // there is no reason to not always use CBS_AUTOHSCROLL, so do use it
 477     msStyle |= CBS_AUTOHSCROLL;
 478
 479     // NB: we used to also add CBS_NOINTEGRALHEIGHT here but why?
 480
 481     return msStyle;
 482 }
 483
 484 // ----------------------------------------------------------------------------
 485 // wxComboBox text control-like methods
 486 // ----------------------------------------------------------------------------
 487
 488 wxString wxComboBox::GetValue() const
 489 {
 490     return wxGetWindowText(m_hWnd);
 491 }
 492
 493 void wxComboBox::SetValue(const wxString& value)
 494 {
 495     if ( HasFlag(wxCB_READONLY) )
 496         SetStringSelection(value);
 497     else
 498         SetWindowText(GetHwnd(), value.c_str());
 499 }
 500
 501 // Clipboard operations
 502 void wxComboBox::Copy()
 503 {
 504     SendMessage(GetHwnd(), WM_COPY, 0, 0L);
 505 }
 506
 507 void wxComboBox::Cut()
 508 {
 509     SendMessage(GetHwnd(), WM_CUT, 0, 0L);
 510 }
 511
 512 void wxComboBox::Paste()
 513 {
 514     SendMessage(GetHwnd(), WM_PASTE, 0, 0L);
 515 }
 516
 517 void wxComboBox::Undo()
 518 {
 519     if (CanUndo())
 520     {
 521         HWND hEditWnd = (HWND) GetEditHWND();
 522         if ( hEditWnd )
 523             ::SendMessage(hEditWnd, EM_UNDO, 0, 0);
 524     }
 525 }
 526
 527 void wxComboBox::Redo()
 528 {
 529     if (CanUndo())
 530     {
 531         // Same as Undo, since Undo undoes the undo, i.e. a redo.
 532         HWND hEditWnd = (HWND) GetEditHWND();
 533         if ( hEditWnd )
 534             ::SendMessage(hEditWnd, EM_UNDO, 0, 0);
 535     }
 536 }
 537
 538 void wxComboBox::SelectAll()
 539 {
 540     SetSelection(0, GetLastPosition());
 541 }
 542
 543 bool wxComboBox::CanUndo() const
 544 {
 545     if (!IsEditable())
 546         return false;
 547
 548     HWND hEditWnd = (HWND) GetEditHWND();
 549     if ( hEditWnd )
 550         return ::SendMessage(hEditWnd, EM_CANUNDO, 0, 0) != 0;
 551     else
 552         return false;
 553 }
 554
 555 bool wxComboBox::CanRedo() const
 556 {
 557     if (!IsEditable())
 558         return false;
 559
 560     HWND hEditWnd = (HWND) GetEditHWND();
 561     if ( hEditWnd )
 562         return ::SendMessage(hEditWnd, EM_CANUNDO, 0, 0) != 0;
 563     else
 564         return false;
 565 }
 566
 567 bool wxComboBox::HasSelection() const
 568 {
 569     long from, to;
 570     GetSelection(&from, &to);
 571     return from != to;
 572 }
 573
 574 bool wxComboBox::CanCopy() const
 575 {
 576     // Can copy if there's a selection
 577     return HasSelection();
 578 }
 579
 580 bool wxComboBox::CanCut() const
 581 {
 582     return IsEditable() && CanCopy();
 583 }
 584
 585 bool wxComboBox::CanPaste() const
 586 {
 587     if ( !IsEditable() )
 588         return false;
 589
 590     // Standard edit control: check for straight text on clipboard
 591     if ( !::OpenClipboard(GetHwndOf(wxTheApp->GetTopWindow())) )
 592         return false;
 593
 594     bool isTextAvailable = ::IsClipboardFormatAvailable(CF_TEXT) != 0;
 595     ::CloseClipboard();
 596
 597     return isTextAvailable;
 598 }
 599
 600 bool wxComboBox::IsEditable() const
 601 {
 602     return !HasFlag(wxCB_READONLY);
 603 }
 604
 605 void wxComboBox::SetEditable(bool WXUNUSED(editable))
 606 {
 607   // Can't implement in MSW?
 608 //  HWND hWnd = GetHwnd();
 609 //  SendMessage(hWnd, EM_SETREADONLY, (WPARAM)!editable, (LPARAM)0L);
 610 }
 611
 612 void wxComboBox::SetInsertionPoint(long pos)
 613 {
 614     if ( GetWindowStyle() & wxCB_READONLY )
 615         return;
 616
 617 #ifdef __WIN32__
 618     HWND hWnd = GetHwnd();
 619     ::SendMessage(hWnd, CB_SETEDITSEL, 0, MAKELPARAM(pos, pos));
 620     HWND hEditWnd = (HWND) GetEditHWND();
 621     if ( hEditWnd )
 622     {
 623         // Scroll insertion point into view
 624         SendMessage(hEditWnd, EM_SCROLLCARET, (WPARAM)0, (LPARAM)0);
 625         // Why is this necessary? (Copied from wxTextCtrl::SetInsertionPoint)
 626         SendMessage(hEditWnd, EM_REPLACESEL, 0, (LPARAM) wxEmptyString);
 627     }
 628 #endif // __WIN32__
 629 }
 630
 631 void wxComboBox::SetInsertionPointEnd()
 632 {
 633     // setting insertion point doesn't make sense for read only comboboxes
 634     if ( !(GetWindowStyle() & wxCB_READONLY) )
 635     {
 636         wxTextPos pos = GetLastPosition();
 637         SetInsertionPoint(pos);
 638     }
 639 }
 640
 641 long wxComboBox::GetInsertionPoint() const
 642 {
 643     // CB_GETEDITSEL returns the index of the first character of the selection in
 644     // its low-order word
 645     DWORD pos= (DWORD)::SendMessage(GetHwnd(), CB_GETEDITSEL, 0, 0L);
 646     return LOWORD(pos);
 647 }
 648
 649 wxTextPos wxComboBox::GetLastPosition() const
 650 {
 651     HWND hEditWnd = (HWND) GetEditHWND();
 652
 653     // Get number of characters in the last (only) line. We'll add this to the character
 654     // index for the last line, 1st position.
 655     wxTextPos lineLength = (wxTextPos)SendMessage(hEditWnd, EM_LINELENGTH, (WPARAM) 0, (LPARAM)0L);
 656
 657     return lineLength;
 658 }
 659
 660 void wxComboBox::Replace(long from, long to, const wxString& value)
 661 {
 662 #if wxUSE_CLIPBOARD
 663     Remove(from, to);
 664
 665     // Now replace with 'value', by pasting.
 666     wxSetClipboardData(wxDF_TEXT, (wxObject *)(const wxChar *)value, 0, 0);
 667
 668     // Paste into edit control
 669     SendMessage(GetHwnd(), WM_PASTE, (WPARAM)0, (LPARAM)0L);
 670 #else
 671     wxUnusedVar(from);
 672     wxUnusedVar(to);
 673     wxUnusedVar(value);
 674 #endif
 675 }
 676
 677 void wxComboBox::Remove(long from, long to)
 678 {
 679     // Set selection and remove it
 680     SetSelection(from, to);
 681     SendMessage(GetHwnd(), WM_CUT, (WPARAM)0, (LPARAM)0);
 682 }
 683
 684 void wxComboBox::SetSelection(long from, long to)
 685 {
 686     // if from and to are both -1, it means (in wxWidgets) that all text should
 687     // be selected, translate this into Windows convention
 688     if ( (from == -1) && (to == -1) )
 689     {
 690         from = 0;
 691     }
 692
 693     if ( SendMessage(GetHwnd(), CB_SETEDITSEL,
 694                      0, (LPARAM)MAKELONG(from, to)) == CB_ERR )
 695     {
 696         wxLogDebug(_T("CB_SETEDITSEL failed"));
 697     }
 698 }
 699
 700 void wxComboBox::GetSelection(long* from, long* to) const
 701 {
 702     DWORD dwStart, dwEnd;
 703     if ( ::SendMessage(GetHwnd(), CB_GETEDITSEL,
 704                        (WPARAM)&dwStart, (LPARAM)&dwEnd) == CB_ERR )
 705     {
 706         *from =
 707         *to = 0;
 708     }
 709     else
 710     {
 711         *from = dwStart;
 712         *to = dwEnd;
 713     }
 714 }
 715
 716 // ----------------------------------------------------------------------------
 717 // standard event handling
 718 // ----------------------------------------------------------------------------
 719
 720 void wxComboBox::OnCut(wxCommandEvent& WXUNUSED(event))
 721 {
 722     Cut();
 723 }
 724
 725 void wxComboBox::OnCopy(wxCommandEvent& WXUNUSED(event))
 726 {
 727     Copy();
 728 }
 729
 730 void wxComboBox::OnPaste(wxCommandEvent& WXUNUSED(event))
 731 {
 732     Paste();
 733 }
 734
 735 void wxComboBox::OnUndo(wxCommandEvent& WXUNUSED(event))
 736 {
 737     Undo();
 738 }
 739
 740 void wxComboBox::OnRedo(wxCommandEvent& WXUNUSED(event))
 741 {
 742     Redo();
 743 }
 744
 745 void wxComboBox::OnDelete(wxCommandEvent& WXUNUSED(event))
 746 {
 747     long from, to;
 748     GetSelection(& from, & to);
 749     if (from != -1 && to != -1)
 750         Remove(from, to);
 751 }
 752
 753 void wxComboBox::OnSelectAll(wxCommandEvent& WXUNUSED(event))
 754 {
 755     SetSelection(-1, -1);
 756 }
 757
 758 void wxComboBox::OnUpdateCut(wxUpdateUIEvent& event)
 759 {
 760     event.Enable( CanCut() );
 761 }
 762
 763 void wxComboBox::OnUpdateCopy(wxUpdateUIEvent& event)
 764 {
 765     event.Enable( CanCopy() );
 766 }
 767
 768 void wxComboBox::OnUpdatePaste(wxUpdateUIEvent& event)
 769 {
 770     event.Enable( CanPaste() );
 771 }
 772
 773 void wxComboBox::OnUpdateUndo(wxUpdateUIEvent& event)
 774 {
 775     event.Enable( CanUndo() );
 776 }
 777
 778 void wxComboBox::OnUpdateRedo(wxUpdateUIEvent& event)
 779 {
 780     event.Enable( CanRedo() );
 781 }
 782
 783 void wxComboBox::OnUpdateDelete(wxUpdateUIEvent& event)
 784 {
 785     event.Enable(HasSelection() && IsEditable());
 786 }
 787
 788 void wxComboBox::OnUpdateSelectAll(wxUpdateUIEvent& event)
 789 {
 790     event.Enable(GetLastPosition() > 0);
 791 }
 792
 793 #endif // wxUSE_COMBOBOX