src/msw/choice.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/msw/choice.cpp
   3 // Purpose:     wxChoice
   4 // Author:      Julian Smart
   5 // Modified by: Vadim Zeitlin to derive from wxChoiceBase
   6 // Created:     04/01/98
   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_CHOICE && !(defined(__SMARTPHONE__) && defined(__WXWINCE__))
  28
  29 #ifndef WX_PRECOMP
  30     #include "wx/choice.h"
  31     #include "wx/utils.h"
  32     #include "wx/log.h"
  33     #include "wx/brush.h"
  34     #include "wx/settings.h"
  35 #endif
  36
  37 #include "wx/msw/private.h"
  38
  39 #if wxUSE_EXTENDED_RTTI
  40 WX_DEFINE_FLAGS( wxChoiceStyle )
  41
  42 wxBEGIN_FLAGS( wxChoiceStyle )
  43     // new style border flags, we put them first to
  44     // use them for streaming out
  45     wxFLAGS_MEMBER(wxBORDER_SIMPLE)
  46     wxFLAGS_MEMBER(wxBORDER_SUNKEN)
  47     wxFLAGS_MEMBER(wxBORDER_DOUBLE)
  48     wxFLAGS_MEMBER(wxBORDER_RAISED)
  49     wxFLAGS_MEMBER(wxBORDER_STATIC)
  50     wxFLAGS_MEMBER(wxBORDER_NONE)
  51
  52     // old style border flags
  53     wxFLAGS_MEMBER(wxSIMPLE_BORDER)
  54     wxFLAGS_MEMBER(wxSUNKEN_BORDER)
  55     wxFLAGS_MEMBER(wxDOUBLE_BORDER)
  56     wxFLAGS_MEMBER(wxRAISED_BORDER)
  57     wxFLAGS_MEMBER(wxSTATIC_BORDER)
  58     wxFLAGS_MEMBER(wxBORDER)
  59
  60     // standard window styles
  61     wxFLAGS_MEMBER(wxTAB_TRAVERSAL)
  62     wxFLAGS_MEMBER(wxCLIP_CHILDREN)
  63     wxFLAGS_MEMBER(wxTRANSPARENT_WINDOW)
  64     wxFLAGS_MEMBER(wxWANTS_CHARS)
  65     wxFLAGS_MEMBER(wxFULL_REPAINT_ON_RESIZE)
  66     wxFLAGS_MEMBER(wxALWAYS_SHOW_SB )
  67     wxFLAGS_MEMBER(wxVSCROLL)
  68     wxFLAGS_MEMBER(wxHSCROLL)
  69
  70 wxEND_FLAGS( wxChoiceStyle )
  71
  72 IMPLEMENT_DYNAMIC_CLASS_XTI(wxChoice, wxControl,"wx/choice.h")
  73
  74 wxBEGIN_PROPERTIES_TABLE(wxChoice)
  75     wxEVENT_PROPERTY( Select , wxEVT_COMMAND_CHOICE_SELECTED , wxCommandEvent )
  76
  77     wxPROPERTY( Font , wxFont , SetFont , GetFont  , EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
  78     wxPROPERTY_COLLECTION( Choices , wxArrayString , wxString , AppendString , GetStrings , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
  79     wxPROPERTY( Selection ,int, SetSelection, GetSelection, EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
  80     wxPROPERTY_FLAGS( WindowStyle , wxChoiceStyle , long , SetWindowStyleFlag , GetWindowStyleFlag , EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group")) // style
  81 wxEND_PROPERTIES_TABLE()
  82
  83 wxBEGIN_HANDLERS_TABLE(wxChoice)
  84 wxEND_HANDLERS_TABLE()
  85
  86 wxCONSTRUCTOR_4( wxChoice , wxWindow* , Parent , wxWindowID , Id , wxPoint , Position , wxSize , Size )
  87 #else
  88 IMPLEMENT_DYNAMIC_CLASS(wxChoice, wxControl)
  89 #endif
  90 /*
  91     TODO PROPERTIES
  92         selection (long)
  93         content (list)
  94             item
  95 */
  96
  97 // ============================================================================
  98 // implementation
  99 // ============================================================================
 100
 101 // ----------------------------------------------------------------------------
 102 // creation
 103 // ----------------------------------------------------------------------------
 104
 105 bool wxChoice::Create(wxWindow *parent,
 106                       wxWindowID id,
 107                       const wxPoint& pos,
 108                       const wxSize& size,
 109                       int n, const wxString choices[],
 110                       long style,
 111                       const wxValidator& validator,
 112                       const wxString& name)
 113 {
 114     // Experience shows that wxChoice vs. wxComboBox distinction confuses
 115     // quite a few people - try to help them
 116     wxASSERT_MSG( !(style & wxCB_DROPDOWN) &&
 117                   !(style & wxCB_READONLY) &&
 118                   !(style & wxCB_SIMPLE),
 119                   _T("this style flag is ignored by wxChoice, you ")
 120                   _T("probably want to use a wxComboBox") );
 121
 122     return CreateAndInit(parent, id, pos, size, n, choices, style,
 123                          validator, name);
 124 }
 125
 126 bool wxChoice::CreateAndInit(wxWindow *parent,
 127                              wxWindowID id,
 128                              const wxPoint& pos,
 129                              const wxSize& size,
 130                              int n, const wxString choices[],
 131                              long style,
 132                              const wxValidator& validator,
 133                              const wxString& name)
 134 {
 135     // initialize wxControl
 136     if ( !CreateControl(parent, id, pos, size, style, validator, name) )
 137         return false;
 138
 139     // now create the real HWND
 140     if ( !MSWCreateControl(wxT("COMBOBOX"), wxEmptyString, pos, size) )
 141         return false;
 142
 143
 144     // choice/combobox normally has "white" (depends on colour scheme, of
 145     // course) background rather than inheriting the parent's background
 146     SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW));
 147
 148     // initialize the controls contents
 149     for ( int i = 0; i < n; i++ )
 150     {
 151         Append(choices[i]);
 152     }
 153
 154     // and now we may finally size the control properly (if needed)
 155     SetBestSize(size);
 156
 157     return true;
 158 }
 159
 160 bool wxChoice::Create(wxWindow *parent,
 161                       wxWindowID id,
 162                       const wxPoint& pos,
 163                       const wxSize& size,
 164                       const wxArrayString& choices,
 165                       long style,
 166                       const wxValidator& validator,
 167                       const wxString& name)
 168 {
 169     wxCArrayString chs(choices);
 170     return Create(parent, id, pos, size, chs.GetCount(), chs.GetStrings(),
 171                   style, validator, name);
 172 }
 173
 174 bool wxChoice::MSWShouldPreProcessMessage(WXMSG *pMsg)
 175 {
 176     MSG *msg = (MSG *) pMsg;
 177
 178     // if the dropdown list is visible, don't preprocess certain keys
 179     if ( msg->message == WM_KEYDOWN
 180         && (msg->wParam == VK_ESCAPE || msg->wParam == VK_RETURN) )
 181     {
 182         if (::SendMessage(GetHwndOf(this), CB_GETDROPPEDSTATE, 0, 0))
 183         {
 184             return false;
 185         }
 186     }
 187
 188     return wxControl::MSWShouldPreProcessMessage(pMsg);
 189 }
 190
 191 WXDWORD wxChoice::MSWGetStyle(long style, WXDWORD *exstyle) const
 192 {
 193     // we never have an external border
 194     WXDWORD msStyle = wxControl::MSWGetStyle
 195                       (
 196                         (style & ~wxBORDER_MASK) | wxBORDER_NONE, exstyle
 197                       );
 198
 199     // WS_CLIPSIBLINGS is useful with wxChoice and doesn't seem to result in
 200     // any problems
 201     msStyle |= WS_CLIPSIBLINGS;
 202
 203     // wxChoice-specific styles
 204     msStyle |= CBS_DROPDOWNLIST | WS_HSCROLL | WS_VSCROLL;
 205     if ( style & wxCB_SORT )
 206         msStyle |= CBS_SORT;
 207
 208     return msStyle;
 209 }
 210
 211 wxChoice::~wxChoice()
 212 {
 213     Free();
 214 }
 215
 216 // ----------------------------------------------------------------------------
 217 // adding/deleting items to/from the list
 218 // ----------------------------------------------------------------------------
 219
 220 int wxChoice::DoAppend(const wxString& item)
 221 {
 222     int n = (int)SendMessage(GetHwnd(), CB_ADDSTRING, 0, (LPARAM)item.c_str());
 223     if ( n == CB_ERR )
 224     {
 225         wxLogLastError(wxT("SendMessage(CB_ADDSTRING)"));
 226     }
 227     else // ok
 228     {
 229         // we need to refresh our size in order to have enough space for the
 230         // newly added items
 231         if ( !IsFrozen() )
 232             UpdateVisibleHeight();
 233     }
 234
 235     InvalidateBestSize();
 236     return n;
 237 }
 238
 239 int wxChoice::DoInsert(const wxString& item, int pos)
 240 {
 241     wxCHECK_MSG(!(GetWindowStyle() & wxCB_SORT), -1, wxT("can't insert into sorted list"));
 242     wxCHECK_MSG((pos>=0) && (pos<=GetCount()), -1, wxT("invalid index"));
 243
 244     int n = (int)SendMessage(GetHwnd(), CB_INSERTSTRING, pos, (LPARAM)item.c_str());
 245     if ( n == CB_ERR )
 246     {
 247         wxLogLastError(wxT("SendMessage(CB_INSERTSTRING)"));
 248     }
 249     else // ok
 250     {
 251         if ( !IsFrozen() )
 252             UpdateVisibleHeight();
 253     }
 254
 255     InvalidateBestSize();
 256     return n;
 257 }
 258
 259 void wxChoice::Delete(int n)
 260 {
 261     wxCHECK_RET( n < GetCount(), wxT("invalid item index in wxChoice::Delete") );
 262
 263     if ( HasClientObjectData() )
 264     {
 265         delete GetClientObject(n);
 266     }
 267
 268     SendMessage(GetHwnd(), CB_DELETESTRING, n, 0);
 269
 270     if ( !IsFrozen() )
 271         UpdateVisibleHeight();
 272
 273     InvalidateBestSize();
 274 }
 275
 276 void wxChoice::Clear()
 277 {
 278     Free();
 279
 280     SendMessage(GetHwnd(), CB_RESETCONTENT, 0, 0);
 281
 282     if ( !IsFrozen() )
 283         UpdateVisibleHeight();
 284
 285     InvalidateBestSize();
 286 }
 287
 288 void wxChoice::Free()
 289 {
 290     if ( HasClientObjectData() )
 291     {
 292         size_t count = GetCount();
 293         for ( size_t n = 0; n < count; n++ )
 294         {
 295             delete GetClientObject(n);
 296         }
 297     }
 298 }
 299
 300 // ----------------------------------------------------------------------------
 301 // selection
 302 // ----------------------------------------------------------------------------
 303
 304 int wxChoice::GetSelection() const
 305 {
 306     // if m_lastAcceptedSelection is set, it means that the dropdown is
 307     // currently shown and that we want to use the last "permanent" selection
 308     // instead of whatever is under the mouse pointer currently
 309     //
 310     // otherwise, get the selection from the control
 311     return m_lastAcceptedSelection == wxID_NONE ? GetCurrentSelection()
 312                                                 : m_lastAcceptedSelection;
 313 }
 314
 315 int wxChoice::GetCurrentSelection() const
 316 {
 317     return (int)SendMessage(GetHwnd(), CB_GETCURSEL, 0, 0);
 318 }
 319
 320 void wxChoice::SetSelection(int n)
 321 {
 322     SendMessage(GetHwnd(), CB_SETCURSEL, n, 0);
 323 }
 324
 325 // ----------------------------------------------------------------------------
 326 // string list functions
 327 // ----------------------------------------------------------------------------
 328
 329 int wxChoice::GetCount() const
 330 {
 331     return (int)SendMessage(GetHwnd(), CB_GETCOUNT, 0, 0);
 332 }
 333
 334 int wxChoice::FindString(const wxString& s, bool bCase) const
 335 {
 336 #if defined(__WATCOMC__) && defined(__WIN386__)
 337     // For some reason, Watcom in WIN386 mode crashes in the CB_FINDSTRINGEXACT message.
 338     // wxChoice::Do it the long way instead.
 339     int count = GetCount();
 340     for ( int i = 0; i < count; i++ )
 341     {
 342         // as CB_FINDSTRINGEXACT is case insensitive, be case insensitive too
 343         if ( GetString(i).IsSameAs(s, bCase) )
 344             return i;
 345     }
 346
 347     return wxNOT_FOUND;
 348 #else // !Watcom
 349    //TODO:  Evidently some MSW versions (all?) don't like empty strings
 350    //passed to SendMessage, so we have to do it ourselves in that case
 351    if ( s.empty() )
 352    {
 353        int count = GetCount();
 354        for ( int i = 0; i < count; i++ )
 355        {
 356          if ( GetString(i).empty() )
 357              return i;
 358        }
 359
 360        return wxNOT_FOUND;
 361    }
 362    else if (bCase)
 363    {
 364        // back to base class search for not native search type
 365        return wxItemContainerImmutable::FindString( s, bCase );
 366    }
 367    else
 368    {
 369        int pos = (int)SendMessage(GetHwnd(), CB_FINDSTRINGEXACT,
 370                                   (WPARAM)-1, (LPARAM)s.c_str());
 371
 372        return pos == LB_ERR ? wxNOT_FOUND : pos;
 373    }
 374 #endif // Watcom/!Watcom
 375 }
 376
 377 void wxChoice::SetString(int n, const wxString& s)
 378 {
 379     wxCHECK_RET( n >= 0 && n < GetCount(),
 380                  wxT("invalid item index in wxChoice::SetString") );
 381
 382     // we have to delete and add back the string as there is no way to change a
 383     // string in place
 384
 385     // we need to preserve the client data
 386     void *data;
 387     if ( m_clientDataItemsType != wxClientData_None )
 388     {
 389         data = DoGetItemClientData(n);
 390     }
 391     else // no client data
 392     {
 393         data = NULL;
 394     }
 395
 396     ::SendMessage(GetHwnd(), CB_DELETESTRING, n, 0);
 397     ::SendMessage(GetHwnd(), CB_INSERTSTRING, n, (LPARAM)s.c_str() );
 398
 399     if ( data )
 400     {
 401         DoSetItemClientData(n, data);
 402     }
 403     //else: it's already NULL by default
 404
 405     InvalidateBestSize();
 406 }
 407
 408 wxString wxChoice::GetString(int n) const
 409 {
 410     int len = (int)::SendMessage(GetHwnd(), CB_GETLBTEXTLEN, n, 0);
 411
 412     wxString str;
 413     if ( len != CB_ERR && len > 0 )
 414     {
 415         if ( ::SendMessage
 416                (
 417                 GetHwnd(),
 418                 CB_GETLBTEXT,
 419                 n,
 420                 (LPARAM)(wxChar *)wxStringBuffer(str, len)
 421                ) == CB_ERR )
 422         {
 423             wxLogLastError(wxT("SendMessage(CB_GETLBTEXT)"));
 424         }
 425     }
 426
 427     return str;
 428 }
 429
 430 // ----------------------------------------------------------------------------
 431 // client data
 432 // ----------------------------------------------------------------------------
 433
 434 void wxChoice::DoSetItemClientData( int n, void* clientData )
 435 {
 436     if ( ::SendMessage(GetHwnd(), CB_SETITEMDATA,
 437                        n, (LPARAM)clientData) == CB_ERR )
 438     {
 439         wxLogLastError(wxT("CB_SETITEMDATA"));
 440     }
 441 }
 442
 443 void* wxChoice::DoGetItemClientData( int n ) const
 444 {
 445     LPARAM rc = SendMessage(GetHwnd(), CB_GETITEMDATA, n, 0);
 446     if ( rc == CB_ERR )
 447     {
 448         wxLogLastError(wxT("CB_GETITEMDATA"));
 449
 450         // unfortunately, there is no way to return an error code to the user
 451         rc = (LPARAM) NULL;
 452     }
 453
 454     return (void *)rc;
 455 }
 456
 457 void wxChoice::DoSetItemClientObject( int n, wxClientData* clientData )
 458 {
 459     DoSetItemClientData(n, clientData);
 460 }
 461
 462 wxClientData* wxChoice::DoGetItemClientObject( int n ) const
 463 {
 464     return (wxClientData *)DoGetItemClientData(n);
 465 }
 466
 467 // ----------------------------------------------------------------------------
 468 // wxMSW specific helpers
 469 // ----------------------------------------------------------------------------
 470
 471 void wxChoice::UpdateVisibleHeight()
 472 {
 473     // be careful to not change the width here
 474     DoSetSize(wxDefaultCoord, wxDefaultCoord, wxDefaultCoord, GetSize().y, wxSIZE_USE_EXISTING);
 475 }
 476
 477 void wxChoice::DoMoveWindow(int x, int y, int width, int height)
 478 {
 479     // here is why this is necessary: if the width is negative, the combobox
 480     // window proc makes the window of the size width*height instead of
 481     // interpreting height in the usual manner (meaning the height of the drop
 482     // down list - usually the height specified in the call to MoveWindow()
 483     // will not change the height of combo box per se)
 484     //
 485     // this behaviour is not documented anywhere, but this is just how it is
 486     // here (NT 4.4) and, anyhow, the check shouldn't hurt - however without
 487     // the check, constraints/sizers using combos may break the height
 488     // constraint will have not at all the same value as expected
 489     if ( width < 0 )
 490         return;
 491
 492     wxControl::DoMoveWindow(x, y, width, height);
 493 }
 494
 495 void wxChoice::DoGetSize(int *w, int *h) const
 496 {
 497     // this is weird: sometimes, the height returned by Windows is clearly the
 498     // total height of the control including the drop down list -- but only
 499     // sometimes, and normally it isn't... I have no idea about what to do with
 500     // this
 501     wxControl::DoGetSize(w, h);
 502 }
 503
 504 void wxChoice::DoSetSize(int x, int y,
 505                          int width, int height,
 506                          int sizeFlags)
 507 {
 508     int heightOrig = height;
 509
 510     // the height which we must pass to Windows should be the total height of
 511     // the control including the drop down list while the height given to us
 512     // is, of course, just the height of the permanently visible part of it
 513     if ( height != wxDefaultCoord )
 514     {
 515         // don't make the drop down list too tall, arbitrarily limit it to 40
 516         // items max and also don't leave it empty
 517         size_t nItems = GetCount();
 518         if ( !nItems )
 519             nItems = 9;
 520         else if ( nItems > 24 )
 521             nItems = 24;
 522
 523         // add space for the drop down list
 524         const int hItem = SendMessage(GetHwnd(), CB_GETITEMHEIGHT, 0, 0);
 525         height += hItem*(nItems + 1);
 526     }
 527     else
 528     {
 529         // We cannot pass wxDefaultCoord as height to wxControl. wxControl uses
 530         // wxGetWindowRect() to determine the current height of the combobox,
 531         // and then again sets the combobox's height to that value. Unfortunately,
 532         // wxGetWindowRect doesn't include the dropdown list's height (at least
 533         // on Win2K), so this would result in a combobox with dropdown height of
 534         // 1 pixel. We have to determine the default height ourselves and call
 535         // wxControl with that value instead.
 536         int w, h;
 537         RECT r;
 538         DoGetSize(&w, &h);
 539         if (::SendMessage(GetHwnd(), CB_GETDROPPEDCONTROLRECT, 0, (LPARAM) &r) != 0)
 540         {
 541             height = h + r.bottom - r.top;
 542         }
 543     }
 544
 545     wxControl::DoSetSize(x, y, width, height, sizeFlags);
 546
 547     // I'm commenting this out since the code appears to make choices
 548     // and comboxes too high when they have associated sizers. I'm sure this
 549     // is not the end of the story, which is why I'm leaving it #if'ed out for
 550     // now. JACS.
 551 #if 0
 552     // if the height specified for the visible part of the control is
 553     // different from the current one, we need to change it separately
 554     // as it is not affected by normal WM_SETSIZE
 555     if ( height != wxDefaultCoord )
 556     {
 557         const int delta = heightOrig - GetSize().y;
 558         if ( delta )
 559         {
 560             int h = ::SendMessage(GetHwnd(), CB_GETITEMHEIGHT, (WPARAM)-1, 0);
 561             SendMessage(GetHwnd(), CB_SETITEMHEIGHT, (WPARAM)-1, h + delta);
 562         }
 563     }
 564 #else
 565     wxUnusedVar(heightOrig);
 566 #endif
 567 }
 568
 569 wxSize wxChoice::DoGetBestSize() const
 570 {
 571     // find the widest string
 572     int wChoice = 0;
 573     const size_t nItems = GetCount();
 574     for ( size_t i = 0; i < nItems; i++ )
 575     {
 576         int wLine;
 577         GetTextExtent(GetString(i), &wLine, NULL);
 578         if ( wLine > wChoice )
 579             wChoice = wLine;
 580     }
 581
 582     // give it some reasonable default value if there are no strings in the
 583     // list
 584     if ( wChoice == 0 )
 585         wChoice = 100;
 586
 587     // the combobox should be slightly larger than the widest string
 588     wChoice += 5*GetCharWidth();
 589
 590     wxSize best(wChoice, EDIT_HEIGHT_FROM_CHAR_HEIGHT(GetCharHeight()));
 591     CacheBestSize(best);
 592     return best;
 593 }
 594
 595 WXLRESULT wxChoice::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam)
 596 {
 597     switch ( nMsg )
 598     {
 599         case WM_LBUTTONUP:
 600             {
 601                 int x = (int)LOWORD(lParam);
 602                 int y = (int)HIWORD(lParam);
 603
 604                 // Ok, this is truly weird, but if a panel with a wxChoice
 605                 // loses the focus, then you get a *fake* WM_LBUTTONUP message
 606                 // with x = 65535 and y = 65535. Filter out this nonsense.
 607                 //
 608                 // VZ: I'd like to know how to reproduce this please...
 609                 if ( x == 65535 && y == 65535 )
 610                     return 0;
 611             }
 612             break;
 613
 614             // we have to handle both: one for the normal case and the other
 615             // for readonly
 616         case WM_CTLCOLOREDIT:
 617         case WM_CTLCOLORLISTBOX:
 618         case WM_CTLCOLORSTATIC:
 619             {
 620                 WXHDC hdc;
 621                 WXHWND hwnd;
 622                 UnpackCtlColor(wParam, lParam, &hdc, &hwnd);
 623
 624                 WXHBRUSH hbr = MSWControlColor((WXHDC)hdc, hwnd);
 625                 if ( hbr )
 626                     return (WXLRESULT)hbr;
 627                 //else: fall through to default window proc
 628             }
 629     }
 630
 631     return wxWindow::MSWWindowProc(nMsg, wParam, lParam);
 632 }
 633
 634 bool wxChoice::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 635 {
 636     /*
 637         The native control provides a great variety in the events it sends in
 638         the different selection scenarios (undoubtedly for greater amusement of
 639         the programmers using it). For the reference, here are the cases when
 640         the final selection is accepted (things are quite interesting when it
 641         is cancelled too):
 642
 643         A. Selecting with just the arrows without opening the dropdown:
 644             1. CBN_SELENDOK
 645             2. CBN_SELCHANGE
 646
 647         B. Opening dropdown with F4 and selecting with arrows:
 648             1. CBN_DROPDOWN
 649             2. many CBN_SELCHANGE while changing selection in the list
 650             3. CBN_SELENDOK
 651             4. CBN_CLOSEUP
 652
 653         C. Selecting with the mouse:
 654             1. CBN_DROPDOWN
 655             -- no intermediate CBN_SELCHANGEs --
 656             2. CBN_SELENDOK
 657             3. CBN_CLOSEUP
 658             4. CBN_SELCHANGE
 659
 660         Admire the different order of messages in all of those cases, it must
 661         surely have taken a lot of effort to Microsoft developers to achieve
 662         such originality.
 663      */
 664     switch ( param )
 665     {
 666         case CBN_DROPDOWN:
 667             // we use this value both because we don't want to track selection
 668             // using CB_GETCURSEL while the dropdown is opened and because we
 669             // need to reset the selection back to it if it's eventually
 670             // cancelled by user
 671             m_lastAcceptedSelection = GetCurrentSelection();
 672             break;
 673
 674         case CBN_CLOSEUP:
 675             // if the selection was accepted by the user, it should have been
 676             // reset to wxID_NONE by CBN_SELENDOK, otherwise the selection was
 677             // cancelled and we must restore the old one
 678             if ( m_lastAcceptedSelection != wxID_NONE )
 679             {
 680                 SetSelection(m_lastAcceptedSelection);
 681                 m_lastAcceptedSelection = wxID_NONE;
 682             }
 683             break;
 684
 685         case CBN_SELENDOK:
 686             // reset it to prevent CBN_CLOSEUP from undoing the selection (it's
 687             // ok to reset it now as GetCurrentSelection() will now return the
 688             // same thing anyhow)
 689             m_lastAcceptedSelection = wxID_NONE;
 690
 691             {
 692                 const int n = GetSelection();
 693
 694                 wxCommandEvent event(wxEVT_COMMAND_CHOICE_SELECTED, m_windowId);
 695                 event.SetInt(n);
 696                 event.SetEventObject(this);
 697
 698                 if ( n > -1 )
 699                 {
 700                     event.SetString(GetStringSelection());
 701                     if ( HasClientObjectData() )
 702                         event.SetClientObject( GetClientObject(n) );
 703                     else if ( HasClientUntypedData() )
 704                         event.SetClientData( GetClientData(n) );
 705                 }
 706
 707                 ProcessCommand(event);
 708             }
 709             break;
 710
 711         // don't handle CBN_SELENDCANCEL: just leave m_lastAcceptedSelection
 712         // valid and the selection will be undone in CBN_CLOSEUP above
 713
 714         // don't handle CBN_SELCHANGE neither, we don't want to generate events
 715         // while the dropdown is opened -- but do add it if we ever need this
 716
 717         default:
 718             return false;
 719     }
 720
 721     return true;
 722 }
 723
 724 WXHBRUSH wxChoice::MSWControlColor(WXHDC hDC, WXHWND hWnd)
 725 {
 726     if ( !IsEnabled() )
 727         return MSWControlColorDisabled(hDC);
 728
 729     return wxChoiceBase::MSWControlColor(hDC, hWnd);
 730 }
 731
 732 #endif // wxUSE_CHOICE && !(__SMARTPHONE__ && __WXWINCE__)