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 #include "wx/choice.h"
  30
  31 #ifndef WX_PRECOMP
  32     #include "wx/utils.h"
  33     #include "wx/log.h"
  34     #include "wx/brush.h"
  35     #include "wx/settings.h"
  36 #endif
  37
  38 #include "wx/msw/private.h"
  39
  40 #if wxUSE_EXTENDED_RTTI
  41 WX_DEFINE_FLAGS( wxChoiceStyle )
  42
  43 wxBEGIN_FLAGS( wxChoiceStyle )
  44     // new style border flags, we put them first to
  45     // use them for streaming out
  46     wxFLAGS_MEMBER(wxBORDER_SIMPLE)
  47     wxFLAGS_MEMBER(wxBORDER_SUNKEN)
  48     wxFLAGS_MEMBER(wxBORDER_DOUBLE)
  49     wxFLAGS_MEMBER(wxBORDER_RAISED)
  50     wxFLAGS_MEMBER(wxBORDER_STATIC)
  51     wxFLAGS_MEMBER(wxBORDER_NONE)
  52
  53     // old style border flags
  54     wxFLAGS_MEMBER(wxSIMPLE_BORDER)
  55     wxFLAGS_MEMBER(wxSUNKEN_BORDER)
  56     wxFLAGS_MEMBER(wxDOUBLE_BORDER)
  57     wxFLAGS_MEMBER(wxRAISED_BORDER)
  58     wxFLAGS_MEMBER(wxSTATIC_BORDER)
  59     wxFLAGS_MEMBER(wxBORDER)
  60
  61     // standard window styles
  62     wxFLAGS_MEMBER(wxTAB_TRAVERSAL)
  63     wxFLAGS_MEMBER(wxCLIP_CHILDREN)
  64     wxFLAGS_MEMBER(wxTRANSPARENT_WINDOW)
  65     wxFLAGS_MEMBER(wxWANTS_CHARS)
  66     wxFLAGS_MEMBER(wxFULL_REPAINT_ON_RESIZE)
  67     wxFLAGS_MEMBER(wxALWAYS_SHOW_SB )
  68     wxFLAGS_MEMBER(wxVSCROLL)
  69     wxFLAGS_MEMBER(wxHSCROLL)
  70
  71 wxEND_FLAGS( wxChoiceStyle )
  72
  73 IMPLEMENT_DYNAMIC_CLASS_XTI(wxChoice, wxControlWithItems,"wx/choice.h")
  74
  75 wxBEGIN_PROPERTIES_TABLE(wxChoice)
  76     wxEVENT_PROPERTY( Select , wxEVT_COMMAND_CHOICE_SELECTED , wxCommandEvent )
  77
  78     wxPROPERTY( Font , wxFont , SetFont , GetFont  , EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
  79     wxPROPERTY_COLLECTION( Choices , wxArrayString , wxString , AppendString , GetStrings , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
  80     wxPROPERTY( Selection ,int, SetSelection, GetSelection, EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
  81     wxPROPERTY_FLAGS( WindowStyle , wxChoiceStyle , long , SetWindowStyleFlag , GetWindowStyleFlag , EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group")) // style
  82 wxEND_PROPERTIES_TABLE()
  83
  84 wxBEGIN_HANDLERS_TABLE(wxChoice)
  85 wxEND_HANDLERS_TABLE()
  86
  87 wxCONSTRUCTOR_4( wxChoice , wxWindow* , Parent , wxWindowID , Id , wxPoint , Position , wxSize , Size )
  88 #else
  89 IMPLEMENT_DYNAMIC_CLASS(wxChoice, wxControlWithItems)
  90 #endif
  91 /*
  92     TODO PROPERTIES
  93         selection (long)
  94         content (list)
  95             item
  96 */
  97
  98 // ============================================================================
  99 // implementation
 100 // ============================================================================
 101
 102 // ----------------------------------------------------------------------------
 103 // creation
 104 // ----------------------------------------------------------------------------
 105
 106 bool wxChoice::Create(wxWindow *parent,
 107                       wxWindowID id,
 108                       const wxPoint& pos,
 109                       const wxSize& size,
 110                       int n, const wxString choices[],
 111                       long style,
 112                       const wxValidator& validator,
 113                       const wxString& name)
 114 {
 115     // Experience shows that wxChoice vs. wxComboBox distinction confuses
 116     // quite a few people - try to help them
 117     wxASSERT_MSG( !(style & wxCB_DROPDOWN) &&
 118                   !(style & wxCB_READONLY) &&
 119                   !(style & wxCB_SIMPLE),
 120                   _T("this style flag is ignored by wxChoice, you ")
 121                   _T("probably want to use a wxComboBox") );
 122
 123     return CreateAndInit(parent, id, pos, size, n, choices, style,
 124                          validator, name);
 125 }
 126
 127 bool wxChoice::CreateAndInit(wxWindow *parent,
 128                              wxWindowID id,
 129                              const wxPoint& pos,
 130                              const wxSize& size,
 131                              int n, const wxString choices[],
 132                              long style,
 133                              const wxValidator& validator,
 134                              const wxString& name)
 135 {
 136     // initialize wxControl
 137     if ( !CreateControl(parent, id, pos, size, style, validator, name) )
 138         return false;
 139
 140     // now create the real HWND
 141     if ( !MSWCreateControl(wxT("COMBOBOX"), wxEmptyString, pos, size) )
 142         return false;
 143
 144
 145     // choice/combobox normally has "white" (depends on colour scheme, of
 146     // course) background rather than inheriting the parent's background
 147     SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW));
 148
 149     // initialize the controls contents
 150     for ( int i = 0; i < n; i++ )
 151     {
 152         Append(choices[i]);
 153     }
 154
 155     // and now we may finally size the control properly (if needed)
 156     SetInitialSize(size);
 157
 158     return true;
 159 }
 160
 161 void wxChoice::SetLabel(const wxString& label)
 162 {
 163     if ( FindString(label) == wxNOT_FOUND )
 164     {
 165         // unless we explicitly do this here, CB_GETCURSEL will continue to
 166         // return the index of the previously selected item which will result
 167         // in wrongly replacing the value being set now with the previously
 168         // value if the user simply opens and closes (without selecting
 169         // anything) the combobox popup
 170         SetSelection(-1);
 171     }
 172
 173     wxChoiceBase::SetLabel(label);
 174 }
 175
 176 bool wxChoice::Create(wxWindow *parent,
 177                       wxWindowID id,
 178                       const wxPoint& pos,
 179                       const wxSize& size,
 180                       const wxArrayString& choices,
 181                       long style,
 182                       const wxValidator& validator,
 183                       const wxString& name)
 184 {
 185     wxCArrayString chs(choices);
 186     return Create(parent, id, pos, size, chs.GetCount(), chs.GetStrings(),
 187                   style, validator, name);
 188 }
 189
 190 bool wxChoice::MSWShouldPreProcessMessage(WXMSG *pMsg)
 191 {
 192     MSG *msg = (MSG *) pMsg;
 193
 194     // if the dropdown list is visible, don't preprocess certain keys
 195     if ( msg->message == WM_KEYDOWN
 196         && (msg->wParam == VK_ESCAPE || msg->wParam == VK_RETURN) )
 197     {
 198         if (::SendMessage(GetHwndOf(this), CB_GETDROPPEDSTATE, 0, 0))
 199         {
 200             return false;
 201         }
 202     }
 203
 204     return wxControl::MSWShouldPreProcessMessage(pMsg);
 205 }
 206
 207 WXDWORD wxChoice::MSWGetStyle(long style, WXDWORD *exstyle) const
 208 {
 209     // we never have an external border
 210     WXDWORD msStyle = wxControl::MSWGetStyle
 211                       (
 212                         (style & ~wxBORDER_MASK) | wxBORDER_NONE, exstyle
 213                       );
 214
 215     // WS_CLIPSIBLINGS is useful with wxChoice and doesn't seem to result in
 216     // any problems
 217     msStyle |= WS_CLIPSIBLINGS;
 218
 219     // wxChoice-specific styles
 220     msStyle |= CBS_DROPDOWNLIST | WS_HSCROLL | WS_VSCROLL;
 221     if ( style & wxCB_SORT )
 222         msStyle |= CBS_SORT;
 223
 224     return msStyle;
 225 }
 226
 227 wxChoice::~wxChoice()
 228 {
 229     Clear();
 230 }
 231
 232 // ----------------------------------------------------------------------------
 233 // adding/deleting items to/from the list
 234 // ----------------------------------------------------------------------------
 235
 236 int wxChoice::DoInsertItems(const wxArrayStringsAdapter& items,
 237                             unsigned int pos,
 238                             void **clientData, wxClientDataType type)
 239 {
 240     MSWAllocStorage(items, CB_INITSTORAGE);
 241
 242     const bool append = pos == GetCount();
 243
 244     // use CB_ADDSTRING when appending at the end to make sure the control is
 245     // resorted if it has wxCB_SORT style
 246     const unsigned msg = append ? CB_ADDSTRING : CB_INSERTSTRING;
 247
 248     if ( append )
 249         pos = 0;
 250
 251     int n = wxNOT_FOUND;
 252     const unsigned numItems = items.GetCount();
 253     for ( unsigned i = 0; i < numItems; ++i )
 254     {
 255         n = MSWInsertOrAppendItem(pos, items[i], msg);
 256         if ( n == wxNOT_FOUND )
 257             return n;
 258
 259         if ( !append )
 260             pos++;
 261
 262         AssignNewItemClientData(n, clientData, i, type);
 263     }
 264
 265     // we need to refresh our size in order to have enough space for the
 266     // newly added items
 267     if ( !IsFrozen() )
 268         MSWUpdateDropDownHeight();
 269
 270     InvalidateBestSize();
 271
 272     return n;
 273 }
 274
 275 void wxChoice::DoDeleteOneItem(unsigned int n)
 276 {
 277     wxCHECK_RET( IsValid(n), wxT("invalid item index in wxChoice::Delete") );
 278
 279     SendMessage(GetHwnd(), CB_DELETESTRING, n, 0);
 280
 281     if ( !IsFrozen() )
 282         MSWUpdateDropDownHeight();
 283
 284     InvalidateBestSize();
 285 }
 286
 287 void wxChoice::DoClear()
 288 {
 289     SendMessage(GetHwnd(), CB_RESETCONTENT, 0, 0);
 290
 291     if ( !IsFrozen() )
 292         MSWUpdateDropDownHeight();
 293
 294     InvalidateBestSize();
 295 }
 296
 297 // ----------------------------------------------------------------------------
 298 // selection
 299 // ----------------------------------------------------------------------------
 300
 301 int wxChoice::GetSelection() const
 302 {
 303     // if m_lastAcceptedSelection is set, it means that the dropdown is
 304     // currently shown and that we want to use the last "permanent" selection
 305     // instead of whatever is under the mouse pointer currently
 306     //
 307     // otherwise, get the selection from the control
 308     return m_lastAcceptedSelection == wxID_NONE ? GetCurrentSelection()
 309                                                 : m_lastAcceptedSelection;
 310 }
 311
 312 int wxChoice::GetCurrentSelection() const
 313 {
 314     return (int)SendMessage(GetHwnd(), CB_GETCURSEL, 0, 0);
 315 }
 316
 317 void wxChoice::SetSelection(int n)
 318 {
 319     SendMessage(GetHwnd(), CB_SETCURSEL, n, 0);
 320 }
 321
 322 // ----------------------------------------------------------------------------
 323 // string list functions
 324 // ----------------------------------------------------------------------------
 325
 326 unsigned int wxChoice::GetCount() const
 327 {
 328     return (unsigned int)SendMessage(GetHwnd(), CB_GETCOUNT, 0, 0);
 329 }
 330
 331 int wxChoice::FindString(const wxString& s, bool bCase) const
 332 {
 333 #if defined(__WATCOMC__) && defined(__WIN386__)
 334     // For some reason, Watcom in WIN386 mode crashes in the CB_FINDSTRINGEXACT message.
 335     // wxChoice::Do it the long way instead.
 336     unsigned int count = GetCount();
 337     for ( unsigned int i = 0; i < count; i++ )
 338     {
 339         // as CB_FINDSTRINGEXACT is case insensitive, be case insensitive too
 340         if (GetString(i).IsSameAs(s, bCase))
 341             return i;
 342     }
 343
 344     return wxNOT_FOUND;
 345 #else // !Watcom
 346    //TODO:  Evidently some MSW versions (all?) don't like empty strings
 347    //passed to SendMessage, so we have to do it ourselves in that case
 348    if ( s.empty() )
 349    {
 350        unsigned int count = GetCount();
 351        for ( unsigned int i = 0; i < count; i++ )
 352        {
 353          if (GetString(i).empty())
 354              return i;
 355        }
 356
 357        return wxNOT_FOUND;
 358    }
 359    else if (bCase)
 360    {
 361        // back to base class search for not native search type
 362        return wxItemContainerImmutable::FindString( s, bCase );
 363    }
 364    else
 365    {
 366        int pos = (int)SendMessage(GetHwnd(), CB_FINDSTRINGEXACT,
 367                                   (WPARAM)-1, (LPARAM)s.wx_str());
 368
 369        return pos == LB_ERR ? wxNOT_FOUND : pos;
 370    }
 371 #endif // Watcom/!Watcom
 372 }
 373
 374 void wxChoice::SetString(unsigned int n, const wxString& s)
 375 {
 376     wxCHECK_RET( IsValid(n), wxT("invalid item index in wxChoice::SetString") );
 377
 378     // we have to delete and add back the string as there is no way to change a
 379     // string in place
 380
 381     // we need to preserve the client data manually
 382     void *oldData = NULL;
 383     wxClientData *oldObjData = NULL;
 384     if ( HasClientUntypedData() )
 385         oldData = GetClientData(n);
 386     else if ( HasClientObjectData() )
 387         oldObjData = GetClientObject(n);
 388
 389     ::SendMessage(GetHwnd(), CB_DELETESTRING, n, 0);
 390     ::SendMessage(GetHwnd(), CB_INSERTSTRING, n, (LPARAM)s.wx_str() );
 391
 392     // restore the client data
 393     if ( oldData )
 394         SetClientData(n, oldData);
 395     else if ( oldObjData )
 396         SetClientObject(n, oldObjData);
 397
 398     InvalidateBestSize();
 399 }
 400
 401 wxString wxChoice::GetString(unsigned int n) const
 402 {
 403     int len = (int)::SendMessage(GetHwnd(), CB_GETLBTEXTLEN, n, 0);
 404
 405     wxString str;
 406     if ( len != CB_ERR && len > 0 )
 407     {
 408         if ( ::SendMessage
 409                (
 410                 GetHwnd(),
 411                 CB_GETLBTEXT,
 412                 n,
 413                 (LPARAM)(wxChar *)wxStringBuffer(str, len)
 414                ) == CB_ERR )
 415         {
 416             wxLogLastError(wxT("SendMessage(CB_GETLBTEXT)"));
 417         }
 418     }
 419
 420     return str;
 421 }
 422
 423 // ----------------------------------------------------------------------------
 424 // client data
 425 // ----------------------------------------------------------------------------
 426
 427 void wxChoice::DoSetItemClientData(unsigned int n, void* clientData)
 428 {
 429     if ( ::SendMessage(GetHwnd(), CB_SETITEMDATA,
 430                        n, (LPARAM)clientData) == CB_ERR )
 431     {
 432         wxLogLastError(wxT("CB_SETITEMDATA"));
 433     }
 434 }
 435
 436 void* wxChoice::DoGetItemClientData(unsigned int n) const
 437 {
 438     LPARAM rc = SendMessage(GetHwnd(), CB_GETITEMDATA, n, 0);
 439     if ( rc == CB_ERR )
 440     {
 441         wxLogLastError(wxT("CB_GETITEMDATA"));
 442
 443         // unfortunately, there is no way to return an error code to the user
 444         rc = (LPARAM) NULL;
 445     }
 446
 447     return (void *)rc;
 448 }
 449
 450 // ----------------------------------------------------------------------------
 451 // wxMSW-specific geometry management
 452 // ----------------------------------------------------------------------------
 453
 454 void wxChoice::MSWUpdateVisibleHeight()
 455 {
 456     if ( m_heightOwn != wxDefaultCoord )
 457         ::SendMessage(GetHwnd(), CB_SETITEMHEIGHT, (WPARAM)-1, m_heightOwn);
 458 }
 459
 460 #if wxUSE_DEFERRED_SIZING
 461 void wxChoice::MSWEndDeferWindowPos()
 462 {
 463     // we can only set the height of the choice itself now as it is reset to
 464     // default every time the control is resized
 465     MSWUpdateVisibleHeight();
 466
 467     wxChoiceBase::MSWEndDeferWindowPos();
 468 }
 469 #endif // wxUSE_DEFERRED_SIZING
 470
 471 void wxChoice::MSWUpdateDropDownHeight()
 472 {
 473     // be careful to not change the width here
 474     DoSetSize(wxDefaultCoord, wxDefaultCoord, wxDefaultCoord, GetSize().y,
 475               wxSIZE_USE_EXISTING);
 476 }
 477
 478 void wxChoice::DoMoveWindow(int x, int y, int width, int height)
 479 {
 480     // here is why this is necessary: if the width is negative, the combobox
 481     // window proc makes the window of the size width*height instead of
 482     // interpreting height in the usual manner (meaning the height of the drop
 483     // down list - usually the height specified in the call to MoveWindow()
 484     // will not change the height of combo box per se)
 485     //
 486     // this behaviour is not documented anywhere, but this is just how it is
 487     // here (NT 4.4) and, anyhow, the check shouldn't hurt - however without
 488     // the check, constraints/sizers using combos may break the height
 489     // constraint will have not at all the same value as expected
 490     if ( width < 0 )
 491         return;
 492
 493     wxControl::DoMoveWindow(x, y, width, height);
 494 }
 495
 496 void wxChoice::DoGetSize(int *w, int *h) const
 497 {
 498     // this is weird: sometimes, the height returned by Windows is clearly the
 499     // total height of the control including the drop down list -- but only
 500     // sometimes, and normally it isn't... I have no idea about what to do with
 501     // this
 502     wxControl::DoGetSize(w, h);
 503 }
 504
 505 void wxChoice::DoSetSize(int x, int y,
 506                          int width, int height,
 507                          int sizeFlags)
 508 {
 509     const int heightOrig = height;
 510
 511     // the height which we must pass to Windows should be the total height of
 512     // the control including the drop down list while the height given to us
 513     // is, of course, just the height of the permanently visible part of it
 514     if ( height != wxDefaultCoord )
 515     {
 516         // set our new own height but be careful not to make it too big: the
 517         // native control apparently stores it as a single byte and so setting
 518         // own height to 256 pixels results in default height being used (255
 519         // is still ok)
 520         if ( height > UCHAR_MAX )
 521             height = UCHAR_MAX;
 522         m_heightOwn = height;
 523
 524         // don't make the drop down list too tall, arbitrarily limit it to 30
 525         // items max and also don't make it too small if it's currently empty
 526         size_t nItems = GetCount();
 527         if ( !nItems )
 528             nItems = 9;
 529         else if ( nItems > 30 )
 530             nItems = 30;
 531
 532         // add space for the drop down list
 533         const int hItem = SendMessage(GetHwnd(), CB_GETITEMHEIGHT, 0, 0);
 534         height += hItem*(nItems + 1);
 535     }
 536     else
 537     {
 538         // We cannot pass wxDefaultCoord as height to wxControl. wxControl uses
 539         // wxGetWindowRect() to determine the current height of the combobox,
 540         // and then again sets the combobox's height to that value. Unfortunately,
 541         // wxGetWindowRect doesn't include the dropdown list's height (at least
 542         // on Win2K), so this would result in a combobox with dropdown height of
 543         // 1 pixel. We have to determine the default height ourselves and call
 544         // wxControl with that value instead.
 545         int w, h;
 546         RECT r;
 547         DoGetSize(&w, &h);
 548         if (::SendMessage(GetHwnd(), CB_GETDROPPEDCONTROLRECT, 0, (LPARAM) &r) != 0)
 549         {
 550             height = h + r.bottom - r.top;
 551         }
 552     }
 553
 554     wxControl::DoSetSize(x, y, width, height, sizeFlags);
 555
 556     // make the control itself of the requested height: notice that this
 557     // must be done after changing its size or it has no effect (apparently
 558     // the height is reset to default during the control layout) and that it's
 559     // useless to to do it when using the deferred sizing -- in this case it
 560     // will be done from MSWEndDeferWindowPos()
 561 #if wxUSE_DEFERRED_SIZING
 562     if ( m_pendingSize == wxDefaultSize )
 563     {
 564         // not using deferred sizing, update it immediately
 565         MSWUpdateVisibleHeight();
 566     }
 567     else // in the middle of deferred sizing
 568     {
 569         // we need to report the size of the visible part of the control back
 570         // in GetSize() and not height stored by DoSetSize() in m_pendingSize
 571         m_pendingSize = wxSize(width, heightOrig);
 572     }
 573 #else // !wxUSE_DEFERRED_SIZING
 574     // always update the visible height immediately
 575     MSWUpdateVisibleHeight();
 576 #endif // wxUSE_DEFERRED_SIZING
 577 }
 578
 579 wxSize wxChoice::DoGetBestSize() const
 580 {
 581     // find the widest string
 582     int wChoice = 0;
 583     const unsigned int nItems = GetCount();
 584     for ( unsigned int i = 0; i < nItems; i++ )
 585     {
 586         int wLine;
 587         GetTextExtent(GetString(i), &wLine, NULL);
 588         if ( wLine > wChoice )
 589             wChoice = wLine;
 590     }
 591
 592     // give it some reasonable default value if there are no strings in the
 593     // list
 594     if ( wChoice == 0 )
 595         wChoice = 100;
 596
 597     // the combobox should be slightly larger than the widest string
 598     wChoice += 5*GetCharWidth();
 599
 600     wxSize best(wChoice, EDIT_HEIGHT_FROM_CHAR_HEIGHT(GetCharHeight()));
 601     CacheBestSize(best);
 602     return best;
 603 }
 604
 605 // ----------------------------------------------------------------------------
 606 // MSW message handlers
 607 // ----------------------------------------------------------------------------
 608
 609 WXLRESULT wxChoice::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam)
 610 {
 611     switch ( nMsg )
 612     {
 613         case WM_LBUTTONUP:
 614             {
 615                 int x = (int)LOWORD(lParam);
 616                 int y = (int)HIWORD(lParam);
 617
 618                 // Ok, this is truly weird, but if a panel with a wxChoice
 619                 // loses the focus, then you get a *fake* WM_LBUTTONUP message
 620                 // with x = 65535 and y = 65535. Filter out this nonsense.
 621                 //
 622                 // VZ: I'd like to know how to reproduce this please...
 623                 if ( x == 65535 && y == 65535 )
 624                     return 0;
 625             }
 626             break;
 627
 628             // we have to handle both: one for the normal case and the other
 629             // for readonly
 630         case WM_CTLCOLOREDIT:
 631         case WM_CTLCOLORLISTBOX:
 632         case WM_CTLCOLORSTATIC:
 633             {
 634                 WXHDC hdc;
 635                 WXHWND hwnd;
 636                 UnpackCtlColor(wParam, lParam, &hdc, &hwnd);
 637
 638                 WXHBRUSH hbr = MSWControlColor((WXHDC)hdc, hwnd);
 639                 if ( hbr )
 640                     return (WXLRESULT)hbr;
 641                 //else: fall through to default window proc
 642             }
 643     }
 644
 645     return wxWindow::MSWWindowProc(nMsg, wParam, lParam);
 646 }
 647
 648 bool wxChoice::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 649 {
 650     /*
 651         The native control provides a great variety in the events it sends in
 652         the different selection scenarios (undoubtedly for greater amusement of
 653         the programmers using it). For the reference, here are the cases when
 654         the final selection is accepted (things are quite interesting when it
 655         is cancelled too):
 656
 657         A. Selecting with just the arrows without opening the dropdown:
 658             1. CBN_SELENDOK
 659             2. CBN_SELCHANGE
 660
 661         B. Opening dropdown with F4 and selecting with arrows:
 662             1. CBN_DROPDOWN
 663             2. many CBN_SELCHANGE while changing selection in the list
 664             3. CBN_SELENDOK
 665             4. CBN_CLOSEUP
 666
 667         C. Selecting with the mouse:
 668             1. CBN_DROPDOWN
 669             -- no intermediate CBN_SELCHANGEs --
 670             2. CBN_SELENDOK
 671             3. CBN_CLOSEUP
 672             4. CBN_SELCHANGE
 673
 674         Admire the different order of messages in all of those cases, it must
 675         surely have taken a lot of effort to Microsoft developers to achieve
 676         such originality.
 677      */
 678     switch ( param )
 679     {
 680         case CBN_DROPDOWN:
 681             // we use this value both because we don't want to track selection
 682             // using CB_GETCURSEL while the dropdown is opened and because we
 683             // need to reset the selection back to it if it's eventually
 684             // cancelled by user
 685             m_lastAcceptedSelection = GetCurrentSelection();
 686             break;
 687
 688         case CBN_CLOSEUP:
 689             // if the selection was accepted by the user, it should have been
 690             // reset to wxID_NONE by CBN_SELENDOK, otherwise the selection was
 691             // cancelled and we must restore the old one
 692             if ( m_lastAcceptedSelection != wxID_NONE )
 693             {
 694                 SetSelection(m_lastAcceptedSelection);
 695                 m_lastAcceptedSelection = wxID_NONE;
 696             }
 697             break;
 698
 699         case CBN_SELENDOK:
 700             // reset it to prevent CBN_CLOSEUP from undoing the selection (it's
 701             // ok to reset it now as GetCurrentSelection() will now return the
 702             // same thing anyhow)
 703             m_lastAcceptedSelection = wxID_NONE;
 704
 705             {
 706                 const int n = GetSelection();
 707
 708                 wxCommandEvent event(wxEVT_COMMAND_CHOICE_SELECTED, m_windowId);
 709                 event.SetInt(n);
 710                 event.SetEventObject(this);
 711
 712                 if ( n > -1 )
 713                 {
 714                     event.SetString(GetStringSelection());
 715                     InitCommandEventWithItems(event, n);
 716                 }
 717
 718                 ProcessCommand(event);
 719             }
 720             break;
 721
 722         // don't handle CBN_SELENDCANCEL: just leave m_lastAcceptedSelection
 723         // valid and the selection will be undone in CBN_CLOSEUP above
 724
 725         // don't handle CBN_SELCHANGE neither, we don't want to generate events
 726         // while the dropdown is opened -- but do add it if we ever need this
 727
 728         default:
 729             return false;
 730     }
 731
 732     return true;
 733 }
 734
 735 WXHBRUSH wxChoice::MSWControlColor(WXHDC hDC, WXHWND hWnd)
 736 {
 737     if ( !IsEnabled() )
 738         return MSWControlColorDisabled(hDC);
 739
 740     return wxChoiceBase::MSWControlColor(hDC, hWnd);
 741 }
 742
 743 #endif // wxUSE_CHOICE && !(__SMARTPHONE__ && __WXWINCE__)