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