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 #endif
  38
  39 #include "wx/brush.h"
  40 #include "wx/clipbrd.h"
  41 #include "wx/msw/private.h"
  42
  43 #if wxUSE_TOOLTIPS
  44     #if !defined(__GNUWIN32_OLD__) || defined(__CYGWIN10__)
  45         #include <commctrl.h>
  46     #endif
  47     #include "wx/tooltip.h"
  48 #endif // wxUSE_TOOLTIPS
  49
  50 // ----------------------------------------------------------------------------
  51 // wxWin macros
  52 // ----------------------------------------------------------------------------
  53
  54 #if wxUSE_EXTENDED_RTTI
  55 WX_DEFINE_FLAGS( wxComboBoxStyle )
  56
  57 wxBEGIN_FLAGS( wxComboBoxStyle )
  58     // new style border flags, we put them first to
  59     // use them for streaming out
  60     wxFLAGS_MEMBER(wxBORDER_SIMPLE)
  61     wxFLAGS_MEMBER(wxBORDER_SUNKEN)
  62     wxFLAGS_MEMBER(wxBORDER_DOUBLE)
  63     wxFLAGS_MEMBER(wxBORDER_RAISED)
  64     wxFLAGS_MEMBER(wxBORDER_STATIC)
  65     wxFLAGS_MEMBER(wxBORDER_NONE)
  66
  67     // old style border flags
  68     wxFLAGS_MEMBER(wxSIMPLE_BORDER)
  69     wxFLAGS_MEMBER(wxSUNKEN_BORDER)
  70     wxFLAGS_MEMBER(wxDOUBLE_BORDER)
  71     wxFLAGS_MEMBER(wxRAISED_BORDER)
  72     wxFLAGS_MEMBER(wxSTATIC_BORDER)
  73     wxFLAGS_MEMBER(wxBORDER)
  74
  75     // standard window styles
  76     wxFLAGS_MEMBER(wxTAB_TRAVERSAL)
  77     wxFLAGS_MEMBER(wxCLIP_CHILDREN)
  78     wxFLAGS_MEMBER(wxTRANSPARENT_WINDOW)
  79     wxFLAGS_MEMBER(wxWANTS_CHARS)
  80     wxFLAGS_MEMBER(wxFULL_REPAINT_ON_RESIZE)
  81     wxFLAGS_MEMBER(wxALWAYS_SHOW_SB )
  82     wxFLAGS_MEMBER(wxVSCROLL)
  83     wxFLAGS_MEMBER(wxHSCROLL)
  84
  85     wxFLAGS_MEMBER(wxCB_SIMPLE)
  86     wxFLAGS_MEMBER(wxCB_SORT)
  87     wxFLAGS_MEMBER(wxCB_READONLY)
  88     wxFLAGS_MEMBER(wxCB_DROPDOWN)
  89
  90 wxEND_FLAGS( wxComboBoxStyle )
  91
  92 IMPLEMENT_DYNAMIC_CLASS_XTI(wxComboBox, wxControl,"wx/combobox.h")
  93
  94 wxBEGIN_PROPERTIES_TABLE(wxComboBox)
  95     wxEVENT_PROPERTY( Select , wxEVT_COMMAND_COMBOBOX_SELECTED , wxCommandEvent )
  96     wxEVENT_PROPERTY( TextEnter , wxEVT_COMMAND_TEXT_ENTER , wxCommandEvent )
  97
  98     // TODO DELEGATES
  99     wxPROPERTY( Font , wxFont , SetFont , GetFont  , EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
 100     wxPROPERTY_COLLECTION( Choices , wxArrayString , wxString , AppendString , GetStrings , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
 101     wxPROPERTY( Value ,wxString, SetValue, GetValue, EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
 102     wxPROPERTY( Selection ,int, SetSelection, GetSelection, EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
 103     wxPROPERTY_FLAGS( WindowStyle , wxComboBoxStyle , long , SetWindowStyleFlag , GetWindowStyleFlag , EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group")) // style
 104 wxEND_PROPERTIES_TABLE()
 105
 106 wxBEGIN_HANDLERS_TABLE(wxComboBox)
 107 wxEND_HANDLERS_TABLE()
 108
 109 wxCONSTRUCTOR_5( wxComboBox , wxWindow* , Parent , wxWindowID , Id , wxString , Value , wxPoint , Position , wxSize , Size )
 110
 111 #else
 112
 113 IMPLEMENT_DYNAMIC_CLASS(wxComboBox, wxControl)
 114
 115 #endif
 116
 117 BEGIN_EVENT_TABLE(wxComboBox, wxControl)
 118     EVT_MENU(wxID_CUT, wxComboBox::OnCut)
 119     EVT_MENU(wxID_COPY, wxComboBox::OnCopy)
 120     EVT_MENU(wxID_PASTE, wxComboBox::OnPaste)
 121     EVT_MENU(wxID_UNDO, wxComboBox::OnUndo)
 122     EVT_MENU(wxID_REDO, wxComboBox::OnRedo)
 123     EVT_MENU(wxID_CLEAR, wxComboBox::OnDelete)
 124     EVT_MENU(wxID_SELECTALL, wxComboBox::OnSelectAll)
 125
 126     EVT_UPDATE_UI(wxID_CUT, wxComboBox::OnUpdateCut)
 127     EVT_UPDATE_UI(wxID_COPY, wxComboBox::OnUpdateCopy)
 128     EVT_UPDATE_UI(wxID_PASTE, wxComboBox::OnUpdatePaste)
 129     EVT_UPDATE_UI(wxID_UNDO, wxComboBox::OnUpdateUndo)
 130     EVT_UPDATE_UI(wxID_REDO, wxComboBox::OnUpdateRedo)
 131     EVT_UPDATE_UI(wxID_CLEAR, wxComboBox::OnUpdateDelete)
 132     EVT_UPDATE_UI(wxID_SELECTALL, wxComboBox::OnUpdateSelectAll)
 133 END_EVENT_TABLE()
 134
 135 // ----------------------------------------------------------------------------
 136 // function prototypes
 137 // ----------------------------------------------------------------------------
 138
 139 LRESULT APIENTRY _EXPORT wxComboEditWndProc(HWND hWnd,
 140                                             UINT message,
 141                                             WPARAM wParam,
 142                                             LPARAM lParam);
 143
 144 // ---------------------------------------------------------------------------
 145 // global vars
 146 // ---------------------------------------------------------------------------
 147
 148 // the pointer to standard radio button wnd proc
 149 static WNDPROC gs_wndprocEdit = (WNDPROC)NULL;
 150
 151 // ============================================================================
 152 // implementation
 153 // ============================================================================
 154
 155 // ----------------------------------------------------------------------------
 156 // wnd proc for subclassed edit control
 157 // ----------------------------------------------------------------------------
 158
 159 LRESULT APIENTRY _EXPORT wxComboEditWndProc(HWND hWnd,
 160                                             UINT message,
 161                                             WPARAM wParam,
 162                                             LPARAM lParam)
 163 {
 164     HWND hwndCombo = ::GetParent(hWnd);
 165     wxWindow *win = wxFindWinFromHandle((WXHWND)hwndCombo);
 166
 167     switch ( message )
 168     {
 169         // forward some messages to the combobox to generate the appropriate
 170         // wxEvents from them
 171         case WM_KEYUP:
 172         case WM_KEYDOWN:
 173         case WM_CHAR:
 174         case WM_SYSCHAR:
 175         case WM_SYSKEYDOWN:
 176         case WM_SYSKEYUP:
 177         case WM_SETFOCUS:
 178         case WM_KILLFOCUS:
 179             {
 180                 wxComboBox *combo = wxDynamicCast(win, wxComboBox);
 181                 if ( !combo )
 182                 {
 183                     // we can get WM_KILLFOCUS while our parent is already half
 184                     // destroyed and hence doesn't look like a combobx any
 185                     // longer, check for it to avoid bogus assert failures
 186                     if ( !win->IsBeingDeleted() )
 187                     {
 188                         wxFAIL_MSG( _T("should have combo as parent") );
 189                     }
 190                 }
 191                 else if ( combo->MSWProcessEditMsg(message, wParam, lParam) )
 192                 {
 193                     // handled by parent
 194                     return 0;
 195                 }
 196             }
 197             break;
 198
 199         case WM_GETDLGCODE:
 200             {
 201                 wxCHECK_MSG( win, 0, _T("should have a parent") );
 202
 203                 if ( win->GetWindowStyle() & wxTE_PROCESS_ENTER )
 204                 {
 205                     // need to return a custom dlg code or we'll never get it
 206                     return DLGC_WANTMESSAGE;
 207                 }
 208             }
 209             break;
 210
 211         // deal with tooltips here
 212 #if wxUSE_TOOLTIPS && defined(TTN_NEEDTEXT)
 213         case WM_NOTIFY:
 214             {
 215                 wxCHECK_MSG( win, 0, _T("should have a parent") );
 216
 217                 NMHDR* hdr = (NMHDR *)lParam;
 218                 if ( hdr->code == TTN_NEEDTEXT )
 219                 {
 220                     wxToolTip *tooltip = win->GetToolTip();
 221                     if ( tooltip )
 222                     {
 223                         TOOLTIPTEXT *ttt = (TOOLTIPTEXT *)lParam;
 224                         ttt->lpszText = (wxChar *)tooltip->GetTip().c_str();
 225                     }
 226
 227                     // processed
 228                     return 0;
 229                 }
 230             }
 231             break;
 232 #endif // wxUSE_TOOLTIPS
 233     }
 234
 235     return ::CallWindowProc(CASTWNDPROC gs_wndprocEdit, hWnd, message, wParam, lParam);
 236 }
 237
 238 // ----------------------------------------------------------------------------
 239 // wxComboBox callbacks
 240 // ----------------------------------------------------------------------------
 241
 242 WXLRESULT wxComboBox::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam)
 243 {
 244     // TODO: handle WM_CTLCOLOR messages from our EDIT control to be able to
 245     //       set its colour correctly (to be the same as our own one)
 246
 247     switch ( nMsg )
 248     {
 249         case WM_SIZE:
 250         // wxStaticBox can generate this message, when modifying the control's style.
 251         // This causes the content of the combobox to be selected, for some reason.
 252         case WM_STYLECHANGED:
 253             {
 254                 // combobox selection sometimes spontaneously changes when its
 255                 // size changes, restore it to the old value if necessary
 256                 long fromOld, toOld;
 257                 GetSelection(&fromOld, &toOld);
 258                 WXLRESULT result = wxChoice::MSWWindowProc(nMsg, wParam, lParam);
 259
 260                 long fromNew, toNew;
 261                 GetSelection(&fromNew, &toNew);
 262
 263                 if ( fromOld != fromNew || toOld != toNew )
 264                 {
 265                     SetSelection(fromOld, toOld);
 266                 }
 267
 268                 return result;
 269             }
 270     }
 271
 272     return wxChoice::MSWWindowProc(nMsg, wParam, lParam);
 273 }
 274
 275 bool wxComboBox::MSWProcessEditMsg(WXUINT msg, WXWPARAM wParam, WXLPARAM lParam)
 276 {
 277     switch ( msg )
 278     {
 279         case WM_CHAR:
 280             // for compatibility with wxTextCtrl, generate a special message
 281             // when Enter is pressed
 282             if ( wParam == VK_RETURN )
 283             {
 284                 wxCommandEvent event(wxEVT_COMMAND_TEXT_ENTER, m_windowId);
 285                 InitCommandEvent(event);
 286                 event.SetString(GetValue());
 287                 event.SetInt(GetSelection());
 288                 if ( ProcessCommand(event) )
 289                 {
 290                     // don't let the event through to the native control
 291                     // because it doesn't need it and may generate an annoying
 292                     // beep if it gets it
 293                     return true;
 294                 }
 295             }
 296             // fall through
 297
 298         case WM_SYSCHAR:
 299             return HandleChar(wParam, lParam, true /* isASCII */);
 300
 301         case WM_SYSKEYDOWN:
 302         case WM_KEYDOWN:
 303             return HandleKeyDown(wParam, lParam);
 304
 305         case WM_SYSKEYUP:
 306         case WM_KEYUP:
 307             return HandleKeyUp(wParam, lParam);
 308
 309         case WM_SETFOCUS:
 310             return HandleSetFocus((WXHWND)wParam);
 311
 312         case WM_KILLFOCUS:
 313             return HandleKillFocus((WXHWND)wParam);
 314     }
 315
 316     return false;
 317 }
 318
 319 bool wxComboBox::MSWCommand(WXUINT param, WXWORD id)
 320 {
 321     int sel = -1;
 322     wxString value;
 323
 324     switch ( param )
 325     {
 326         case CBN_SELENDOK:
 327 #ifndef __SMARTPHONE__
 328             // we need to reset this to prevent the selection from being undone
 329             // by wxChoice, see wxChoice::MSWCommand() and comments there
 330             m_lastAcceptedSelection = wxID_NONE;
 331 #endif
 332
 333             // set these variables so that they could be also fixed in
 334             // CBN_EDITCHANGE below
 335             sel = GetSelection();
 336             value = GetStringSelection();
 337             {
 338                 wxCommandEvent event(wxEVT_COMMAND_COMBOBOX_SELECTED, GetId());
 339                 event.SetEventObject(this);
 340                 event.SetInt(sel);
 341                 event.SetString(value);
 342                 ProcessCommand(event);
 343             }
 344
 345             // fall through: for compability with wxGTK, also send the text
 346             // update event when the selection changes (this also seems more
 347             // logical as the text does change)
 348
 349         case CBN_EDITCHANGE:
 350             {
 351                 wxCommandEvent event(wxEVT_COMMAND_TEXT_UPDATED, GetId());
 352                 event.SetEventObject(this);
 353
 354                 // if sel != -1, value was already initialized above
 355                 if ( sel == -1 )
 356                 {
 357                     value = wxGetWindowText(GetHwnd());
 358                 }
 359
 360                 event.SetString(value);
 361                 ProcessCommand(event);
 362             }
 363             break;
 364
 365         default:
 366             return wxChoice::MSWCommand(param, id);
 367     }
 368
 369     // skip wxChoice version as it would generate its own events for
 370     // CBN_SELENDOK
 371     return wxControl::MSWCommand(param, id);
 372 }
 373
 374 WXHWND wxComboBox::GetEditHWND() const
 375 {
 376     // this function should not be called for wxCB_READONLY controls, it is
 377     // the callers responsability to check this
 378     wxASSERT_MSG( !(GetWindowStyle() & wxCB_READONLY),
 379                   _T("read-only combobox doesn't have any edit control") );
 380
 381     POINT pt;
 382     pt.x = pt.y = 4;
 383     HWND hwndEdit = ::ChildWindowFromPoint(GetHwnd(), pt);
 384     if ( !hwndEdit || hwndEdit == GetHwnd() )
 385     {
 386         wxFAIL_MSG(_T("not read only combobox without edit control?"));
 387     }
 388
 389     return (WXHWND)hwndEdit;
 390 }
 391
 392 // ----------------------------------------------------------------------------
 393 // wxComboBox creation
 394 // ----------------------------------------------------------------------------
 395
 396 bool wxComboBox::Create(wxWindow *parent, wxWindowID id,
 397                         const wxString& value,
 398                         const wxPoint& pos,
 399                         const wxSize& size,
 400                         int n, const wxString choices[],
 401                         long style,
 402                         const wxValidator& validator,
 403                         const wxString& name)
 404 {
 405     // pretend that wxComboBox is hidden while it is positioned and resized and
 406     // show it only right before leaving this method because otherwise there is
 407     // some noticeable flicker while the control rearranges itself
 408     m_isShown = false;
 409
 410     if ( !CreateAndInit(parent, id, pos, size, n, choices, style,
 411                         validator, name) )
 412         return false;
 413
 414     // we shouldn't call SetValue() for an empty string because this would
 415     // (correctly) result in an assert with a read only combobox and is useless
 416     // for the other ones anyhow
 417     if ( !value.empty() )
 418         SetValue(value);
 419
 420     // a (not read only) combobox is, in fact, 2 controls: the combobox itself
 421     // and an edit control inside it and if we want to catch events from this
 422     // edit control, we must subclass it as well
 423     if ( !(style & wxCB_READONLY) )
 424     {
 425         gs_wndprocEdit = wxSetWindowProc((HWND)GetEditHWND(),
 426                                          wxComboEditWndProc);
 427     }
 428
 429     // and finally, show the control
 430     Show(true);
 431
 432     return true;
 433 }
 434
 435 bool wxComboBox::Create(wxWindow *parent, wxWindowID id,
 436                         const wxString& value,
 437                         const wxPoint& pos,
 438                         const wxSize& size,
 439                         const wxArrayString& choices,
 440                         long style,
 441                         const wxValidator& validator,
 442                         const wxString& name)
 443 {
 444     wxCArrayString chs(choices);
 445     return Create(parent, id, value, pos, size, chs.GetCount(),
 446                   chs.GetStrings(), style, validator, name);
 447 }
 448
 449 WXDWORD wxComboBox::MSWGetStyle(long style, WXDWORD *exstyle) const
 450 {
 451     // we never have an external border
 452     WXDWORD msStyle = wxChoice::MSWGetStyle
 453                       (
 454                         (style & ~wxBORDER_MASK) | wxBORDER_NONE, exstyle
 455                       );
 456
 457     // usually WS_TABSTOP is added by wxControl::MSWGetStyle() but as we're
 458     // created hidden (see Create() above), it is not done for us but we still
 459     // want to have this style
 460     msStyle |= WS_TABSTOP;
 461
 462     // remove the style always added by wxChoice
 463     msStyle &= ~CBS_DROPDOWNLIST;
 464
 465     if ( style & wxCB_READONLY )
 466         msStyle |= CBS_DROPDOWNLIST;
 467 #ifndef __WXWINCE__
 468     else if ( style & wxCB_SIMPLE )
 469         msStyle |= CBS_SIMPLE; // A list (shown always) and edit control
 470 #endif
 471     else
 472         msStyle |= CBS_DROPDOWN;
 473
 474     // there is no reason to not always use CBS_AUTOHSCROLL, so do use it
 475     msStyle |= CBS_AUTOHSCROLL;
 476
 477     // NB: we used to also add CBS_NOINTEGRALHEIGHT here but why?
 478
 479     return msStyle;
 480 }
 481
 482 // ----------------------------------------------------------------------------
 483 // wxComboBox text control-like methods
 484 // ----------------------------------------------------------------------------
 485
 486 wxString wxComboBox::GetValue() const
 487 {
 488     return wxGetWindowText(m_hWnd);
 489 }
 490
 491 void wxComboBox::SetValue(const wxString& value)
 492 {
 493     if ( HasFlag(wxCB_READONLY) )
 494         SetStringSelection(value);
 495     else
 496         SetWindowText(GetHwnd(), value.c_str());
 497 }
 498
 499 // Clipboard operations
 500 void wxComboBox::Copy()
 501 {
 502     SendMessage(GetHwnd(), WM_COPY, 0, 0L);
 503 }
 504
 505 void wxComboBox::Cut()
 506 {
 507     SendMessage(GetHwnd(), WM_CUT, 0, 0L);
 508 }
 509
 510 void wxComboBox::Paste()
 511 {
 512     SendMessage(GetHwnd(), WM_PASTE, 0, 0L);
 513 }
 514
 515 void wxComboBox::Undo()
 516 {
 517     if (CanUndo())
 518     {
 519         HWND hEditWnd = (HWND) GetEditHWND();
 520         if ( hEditWnd )
 521             ::SendMessage(hEditWnd, EM_UNDO, 0, 0);
 522     }
 523 }
 524
 525 void wxComboBox::Redo()
 526 {
 527     if (CanUndo())
 528     {
 529         // Same as Undo, since Undo undoes the undo, i.e. a redo.
 530         HWND hEditWnd = (HWND) GetEditHWND();
 531         if ( hEditWnd )
 532             ::SendMessage(hEditWnd, EM_UNDO, 0, 0);
 533     }
 534 }
 535
 536 void wxComboBox::SelectAll()
 537 {
 538     SetSelection(0, GetLastPosition());
 539 }
 540
 541 bool wxComboBox::CanUndo() const
 542 {
 543     if (!IsEditable())
 544         return false;
 545
 546     HWND hEditWnd = (HWND) GetEditHWND();
 547     if ( hEditWnd )
 548         return ::SendMessage(hEditWnd, EM_CANUNDO, 0, 0) != 0;
 549     else
 550         return false;
 551 }
 552
 553 bool wxComboBox::CanRedo() const
 554 {
 555     if (!IsEditable())
 556         return false;
 557
 558     HWND hEditWnd = (HWND) GetEditHWND();
 559     if ( hEditWnd )
 560         return ::SendMessage(hEditWnd, EM_CANUNDO, 0, 0) != 0;
 561     else
 562         return false;
 563 }
 564
 565 bool wxComboBox::HasSelection() const
 566 {
 567     long from, to;
 568     GetSelection(&from, &to);
 569     return from != to;
 570 }
 571
 572 bool wxComboBox::CanCopy() const
 573 {
 574     // Can copy if there's a selection
 575     return HasSelection();
 576 }
 577
 578 bool wxComboBox::CanCut() const
 579 {
 580     return IsEditable() && CanCopy();
 581 }
 582
 583 bool wxComboBox::CanPaste() const
 584 {
 585     if ( !IsEditable() )
 586         return false;
 587
 588     // Standard edit control: check for straight text on clipboard
 589     if ( !::OpenClipboard(GetHwndOf(wxTheApp->GetTopWindow())) )
 590         return false;
 591
 592     bool isTextAvailable = ::IsClipboardFormatAvailable(CF_TEXT) != 0;
 593     ::CloseClipboard();
 594
 595     return isTextAvailable;
 596 }
 597
 598 bool wxComboBox::IsEditable() const
 599 {
 600     return !HasFlag(wxCB_READONLY);
 601 }
 602
 603 void wxComboBox::SetEditable(bool WXUNUSED(editable))
 604 {
 605   // Can't implement in MSW?
 606 //  HWND hWnd = GetHwnd();
 607 //  SendMessage(hWnd, EM_SETREADONLY, (WPARAM)!editable, (LPARAM)0L);
 608 }
 609
 610 void wxComboBox::SetInsertionPoint(long pos)
 611 {
 612     if ( GetWindowStyle() & wxCB_READONLY )
 613         return;
 614
 615 #ifdef __WIN32__
 616     HWND hWnd = GetHwnd();
 617     ::SendMessage(hWnd, CB_SETEDITSEL, 0, MAKELPARAM(pos, pos));
 618     HWND hEditWnd = (HWND) GetEditHWND();
 619     if ( hEditWnd )
 620     {
 621         // Scroll insertion point into view
 622         SendMessage(hEditWnd, EM_SCROLLCARET, (WPARAM)0, (LPARAM)0);
 623         // Why is this necessary? (Copied from wxTextCtrl::SetInsertionPoint)
 624         SendMessage(hEditWnd, EM_REPLACESEL, 0, (LPARAM) wxEmptyString);
 625     }
 626 #endif // __WIN32__
 627 }
 628
 629 void wxComboBox::SetInsertionPointEnd()
 630 {
 631     // setting insertion point doesn't make sense for read only comboboxes
 632     if ( !(GetWindowStyle() & wxCB_READONLY) )
 633     {
 634         wxTextPos pos = GetLastPosition();
 635         SetInsertionPoint(pos);
 636     }
 637 }
 638
 639 long wxComboBox::GetInsertionPoint() const
 640 {
 641     // CB_GETEDITSEL returns the index of the first character of the selection in
 642     // its low-order word
 643     DWORD pos= (DWORD)::SendMessage(GetHwnd(), CB_GETEDITSEL, 0, 0L);
 644     return LOWORD(pos);
 645 }
 646
 647 wxTextPos wxComboBox::GetLastPosition() const
 648 {
 649     HWND hEditWnd = (HWND) GetEditHWND();
 650
 651     // Get number of characters in the last (only) line. We'll add this to the character
 652     // index for the last line, 1st position.
 653     wxTextPos lineLength = (wxTextPos)SendMessage(hEditWnd, EM_LINELENGTH, (WPARAM) 0, (LPARAM)0L);
 654
 655     return lineLength;
 656 }
 657
 658 void wxComboBox::Replace(long from, long to, const wxString& value)
 659 {
 660 #if wxUSE_CLIPBOARD
 661     Remove(from, to);
 662
 663     // Now replace with 'value', by pasting.
 664     wxSetClipboardData(wxDF_TEXT, (wxObject *)(const wxChar *)value, 0, 0);
 665
 666     // Paste into edit control
 667     SendMessage(GetHwnd(), WM_PASTE, (WPARAM)0, (LPARAM)0L);
 668 #else
 669     wxUnusedVar(from);
 670     wxUnusedVar(to);
 671     wxUnusedVar(value);
 672 #endif
 673 }
 674
 675 void wxComboBox::Remove(long from, long to)
 676 {
 677     // Set selection and remove it
 678     SetSelection(from, to);
 679     SendMessage(GetHwnd(), WM_CUT, (WPARAM)0, (LPARAM)0);
 680 }
 681
 682 void wxComboBox::SetSelection(long from, long to)
 683 {
 684     // if from and to are both -1, it means (in wxWidgets) that all text should
 685     // be selected, translate this into Windows convention
 686     if ( (from == -1) && (to == -1) )
 687     {
 688         from = 0;
 689     }
 690
 691     if ( SendMessage(GetHwnd(), CB_SETEDITSEL,
 692                      0, (LPARAM)MAKELONG(from, to)) == CB_ERR )
 693     {
 694         wxLogDebug(_T("CB_SETEDITSEL failed"));
 695     }
 696 }
 697
 698 void wxComboBox::GetSelection(long* from, long* to) const
 699 {
 700     DWORD dwStart, dwEnd;
 701     if ( ::SendMessage(GetHwnd(), CB_GETEDITSEL,
 702                        (WPARAM)&dwStart, (LPARAM)&dwEnd) == CB_ERR )
 703     {
 704         *from =
 705         *to = 0;
 706     }
 707     else
 708     {
 709         *from = dwStart;
 710         *to = dwEnd;
 711     }
 712 }
 713
 714 // ----------------------------------------------------------------------------
 715 // standard event handling
 716 // ----------------------------------------------------------------------------
 717
 718 void wxComboBox::OnCut(wxCommandEvent& WXUNUSED(event))
 719 {
 720     Cut();
 721 }
 722
 723 void wxComboBox::OnCopy(wxCommandEvent& WXUNUSED(event))
 724 {
 725     Copy();
 726 }
 727
 728 void wxComboBox::OnPaste(wxCommandEvent& WXUNUSED(event))
 729 {
 730     Paste();
 731 }
 732
 733 void wxComboBox::OnUndo(wxCommandEvent& WXUNUSED(event))
 734 {
 735     Undo();
 736 }
 737
 738 void wxComboBox::OnRedo(wxCommandEvent& WXUNUSED(event))
 739 {
 740     Redo();
 741 }
 742
 743 void wxComboBox::OnDelete(wxCommandEvent& WXUNUSED(event))
 744 {
 745     long from, to;
 746     GetSelection(& from, & to);
 747     if (from != -1 && to != -1)
 748         Remove(from, to);
 749 }
 750
 751 void wxComboBox::OnSelectAll(wxCommandEvent& WXUNUSED(event))
 752 {
 753     SetSelection(-1, -1);
 754 }
 755
 756 void wxComboBox::OnUpdateCut(wxUpdateUIEvent& event)
 757 {
 758     event.Enable( CanCut() );
 759 }
 760
 761 void wxComboBox::OnUpdateCopy(wxUpdateUIEvent& event)
 762 {
 763     event.Enable( CanCopy() );
 764 }
 765
 766 void wxComboBox::OnUpdatePaste(wxUpdateUIEvent& event)
 767 {
 768     event.Enable( CanPaste() );
 769 }
 770
 771 void wxComboBox::OnUpdateUndo(wxUpdateUIEvent& event)
 772 {
 773     event.Enable( CanUndo() );
 774 }
 775
 776 void wxComboBox::OnUpdateRedo(wxUpdateUIEvent& event)
 777 {
 778     event.Enable( CanRedo() );
 779 }
 780
 781 void wxComboBox::OnUpdateDelete(wxUpdateUIEvent& event)
 782 {
 783     event.Enable(HasSelection() && IsEditable());
 784 }
 785
 786 void wxComboBox::OnUpdateSelectAll(wxUpdateUIEvent& event)
 787 {
 788     event.Enable(GetLastPosition() > 0);
 789 }
 790
 791 #endif // wxUSE_COMBOBOX