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, wxControl,"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, wxControl)
  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     SetBestSize(size);
 157
 158     return true;
 159 }
 160
 161 bool wxChoice::Create(wxWindow *parent,
 162                       wxWindowID id,
 163                       const wxPoint& pos,
 164                       const wxSize& size,
 165                       const wxArrayString& choices,
 166                       long style,
 167                       const wxValidator& validator,
 168                       const wxString& name)
 169 {
 170     wxCArrayString chs(choices);
 171     return Create(parent, id, pos, size, chs.GetCount(), chs.GetStrings(),
 172                   style, validator, name);
 173 }
 174
 175 bool wxChoice::MSWShouldPreProcessMessage(WXMSG *pMsg)
 176 {
 177     MSG *msg = (MSG *) pMsg;
 178
 179     // if the dropdown list is visible, don't preprocess certain keys
 180     if ( msg->message == WM_KEYDOWN
 181         && (msg->wParam == VK_ESCAPE || msg->wParam == VK_RETURN) )
 182     {
 183         if (::SendMessage(GetHwndOf(this), CB_GETDROPPEDSTATE, 0, 0))
 184         {
 185             return false;
 186         }
 187     }
 188
 189     return wxControl::MSWShouldPreProcessMessage(pMsg);
 190 }
 191
 192 WXDWORD wxChoice::MSWGetStyle(long style, WXDWORD *exstyle) const
 193 {
 194     // we never have an external border
 195     WXDWORD msStyle = wxControl::MSWGetStyle
 196                       (
 197                         (style & ~wxBORDER_MASK) | wxBORDER_NONE, exstyle
 198                       );
 199
 200     // WS_CLIPSIBLINGS is useful with wxChoice and doesn't seem to result in
 201     // any problems
 202     msStyle |= WS_CLIPSIBLINGS;
 203
 204     // wxChoice-specific styles
 205     msStyle |= CBS_DROPDOWNLIST | WS_HSCROLL | WS_VSCROLL;
 206     if ( style & wxCB_SORT )
 207         msStyle |= CBS_SORT;
 208
 209     return msStyle;
 210 }
 211
 212 wxChoice::~wxChoice()
 213 {
 214     Free();
 215 }
 216
 217 // ----------------------------------------------------------------------------
 218 // adding/deleting items to/from the list
 219 // ----------------------------------------------------------------------------
 220
 221 int wxChoice::DoAppend(const wxString& item)
 222 {
 223     int n = (int)SendMessage(GetHwnd(), CB_ADDSTRING, 0, (LPARAM)item.c_str());
 224     if ( n == CB_ERR )
 225     {
 226         wxLogLastError(wxT("SendMessage(CB_ADDSTRING)"));
 227     }
 228     else // ok
 229     {
 230         // we need to refresh our size in order to have enough space for the
 231         // newly added items
 232         if ( !IsFrozen() )
 233             UpdateVisibleHeight();
 234     }
 235
 236     InvalidateBestSize();
 237     return n;
 238 }
 239
 240 int wxChoice::DoInsert(const wxString& item, unsigned int pos)
 241 {
 242     wxCHECK_MSG(!(GetWindowStyle() & wxCB_SORT), -1, wxT("can't insert into sorted list"));
 243     wxCHECK_MSG(IsValidInsert(pos), -1, wxT("invalid index"));
 244
 245     int n = (int)SendMessage(GetHwnd(), CB_INSERTSTRING, pos, (LPARAM)item.c_str());
 246     if ( n == CB_ERR )
 247     {
 248         wxLogLastError(wxT("SendMessage(CB_INSERTSTRING)"));
 249     }
 250     else // ok
 251     {
 252         if ( !IsFrozen() )
 253             UpdateVisibleHeight();
 254     }
 255
 256     InvalidateBestSize();
 257     return n;
 258 }
 259
 260 void wxChoice::Delete(unsigned int n)
 261 {
 262     wxCHECK_RET( IsValid(n), wxT("invalid item index in wxChoice::Delete") );
 263
 264     if ( HasClientObjectData() )
 265     {
 266         delete GetClientObject(n);
 267     }
 268
 269     SendMessage(GetHwnd(), CB_DELETESTRING, n, 0);
 270
 271     if ( !IsFrozen() )
 272         UpdateVisibleHeight();
 273
 274     InvalidateBestSize();
 275 }
 276
 277 void wxChoice::Clear()
 278 {
 279     Free();
 280
 281     SendMessage(GetHwnd(), CB_RESETCONTENT, 0, 0);
 282
 283     if ( !IsFrozen() )
 284         UpdateVisibleHeight();
 285
 286     InvalidateBestSize();
 287 }
 288
 289 void wxChoice::Free()
 290 {
 291     if ( HasClientObjectData() )
 292     {
 293         unsigned int count = GetCount();
 294         for ( unsigned int n = 0; n < count; n++ )
 295         {
 296             delete GetClientObject(n);
 297         }
 298     }
 299 }
 300
 301 // ----------------------------------------------------------------------------
 302 // selection
 303 // ----------------------------------------------------------------------------
 304
 305 int wxChoice::GetSelection() const
 306 {
 307     // if m_lastAcceptedSelection is set, it means that the dropdown is
 308     // currently shown and that we want to use the last "permanent" selection
 309     // instead of whatever is under the mouse pointer currently
 310     //
 311     // otherwise, get the selection from the control
 312     return m_lastAcceptedSelection == wxID_NONE ? GetCurrentSelection()
 313                                                 : m_lastAcceptedSelection;
 314 }
 315
 316 int wxChoice::GetCurrentSelection() const
 317 {
 318     return (int)SendMessage(GetHwnd(), CB_GETCURSEL, 0, 0);
 319 }
 320
 321 void wxChoice::SetSelection(int n)
 322 {
 323     SendMessage(GetHwnd(), CB_SETCURSEL, n, 0);
 324 }
 325
 326 // ----------------------------------------------------------------------------
 327 // string list functions
 328 // ----------------------------------------------------------------------------
 329
 330 unsigned int wxChoice::GetCount() const
 331 {
 332     return (unsigned int)SendMessage(GetHwnd(), CB_GETCOUNT, 0, 0);
 333 }
 334
 335 int wxChoice::FindString(const wxString& s, bool bCase) const
 336 {
 337 #if defined(__WATCOMC__) && defined(__WIN386__)
 338     // For some reason, Watcom in WIN386 mode crashes in the CB_FINDSTRINGEXACT message.
 339     // wxChoice::Do it the long way instead.
 340     unsigned int count = GetCount();
 341     for ( unsigned int i = 0; i < count; i++ )
 342     {
 343         // as CB_FINDSTRINGEXACT is case insensitive, be case insensitive too
 344         if (GetString(i).IsSameAs(s, bCase))
 345             return i;
 346     }
 347
 348     return wxNOT_FOUND;
 349 #else // !Watcom
 350    //TODO:  Evidently some MSW versions (all?) don't like empty strings
 351    //passed to SendMessage, so we have to do it ourselves in that case
 352    if ( s.empty() )
 353    {
 354        unsigned int count = GetCount();
 355        for ( unsigned int i = 0; i < count; i++ )
 356        {
 357          if (GetString(i).empty())
 358              return i;
 359        }
 360
 361        return wxNOT_FOUND;
 362    }
 363    else if (bCase)
 364    {
 365        // back to base class search for not native search type
 366        return wxItemContainerImmutable::FindString( s, bCase );
 367    }
 368    else
 369    {
 370        int pos = (int)SendMessage(GetHwnd(), CB_FINDSTRINGEXACT,
 371                                   (WPARAM)-1, (LPARAM)s.c_str());
 372
 373        return pos == LB_ERR ? wxNOT_FOUND : pos;
 374    }
 375 #endif // Watcom/!Watcom
 376 }
 377
 378 void wxChoice::SetString(unsigned int n, const wxString& s)
 379 {
 380     wxCHECK_RET( IsValid(n), 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(unsigned 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(unsigned 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(unsigned 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(unsigned int n, wxClientData* clientData)
 458 {
 459     DoSetItemClientData(n, clientData);
 460 }
 461
 462 wxClientData* wxChoice::DoGetItemClientObject(unsigned 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     // the height which we must pass to Windows should be the total height of
 509     // the control including the drop down list while the height given to us
 510     // is, of course, just the height of the permanently visible part of it
 511     if ( height != wxDefaultCoord )
 512     {
 513         // don't make the drop down list too tall, arbitrarily limit it to 40
 514         // items max and also don't leave it empty
 515         size_t nItems = GetCount();
 516         if ( !nItems )
 517             nItems = 9;
 518         else if ( nItems > 24 )
 519             nItems = 24;
 520
 521         // add space for the drop down list
 522         const int hItem = SendMessage(GetHwnd(), CB_GETITEMHEIGHT, 0, 0);
 523         height += hItem*(nItems + 1);
 524     }
 525     else
 526     {
 527         // We cannot pass wxDefaultCoord as height to wxControl. wxControl uses
 528         // wxGetWindowRect() to determine the current height of the combobox,
 529         // and then again sets the combobox's height to that value. Unfortunately,
 530         // wxGetWindowRect doesn't include the dropdown list's height (at least
 531         // on Win2K), so this would result in a combobox with dropdown height of
 532         // 1 pixel. We have to determine the default height ourselves and call
 533         // wxControl with that value instead.
 534         int w, h;
 535         RECT r;
 536         DoGetSize(&w, &h);
 537         if (::SendMessage(GetHwnd(), CB_GETDROPPEDCONTROLRECT, 0, (LPARAM) &r) != 0)
 538         {
 539             height = h + r.bottom - r.top;
 540         }
 541     }
 542
 543     wxControl::DoSetSize(x, y, width, height, sizeFlags);
 544
 545     // If we're storing a pending size, make sure we store
 546     // the original size for reporting back to the app.
 547     if (m_pendingSize != wxDefaultSize)
 548         m_pendingSize = wxSize(width, heightOrig);
 549
 550     // This solution works on XP, but causes choice/combobox lists to be
 551     // too short on W2K and earlier.
 552 #if 0
 553     int widthCurrent, heightCurrent;
 554     DoGetSize(&widthCurrent, &heightCurrent);
 555
 556     // the height which we must pass to Windows should be the total height of
 557     // the control including the drop down list while the height given to us
 558     // is, of course, just the height of the permanently visible part of it
 559     if ( height != wxDefaultCoord && height != heightCurrent )
 560     {
 561         // don't make the drop down list too tall, arbitrarily limit it to 40
 562         // items max and also don't leave it empty
 563         unsigned int nItems = GetCount();
 564         if ( !nItems )
 565             nItems = 9;
 566         else if ( nItems > 24 )
 567             nItems = 24;
 568
 569         // add space for the drop down list
 570         const int hItem = SendMessage(GetHwnd(), CB_GETITEMHEIGHT, 0, 0);
 571         height += hItem*(nItems + 1);
 572     }
 573     else // keep the same height as now
 574     {
 575         // normally wxWindow::DoSetSize() checks if we set the same size as the
 576         // window already has and does nothing in this case, but for us the
 577         // check fails as the size we pass to it includes the dropdown while
 578         // the size returned by our GetSize() does not, so test if the size
 579         // didn't really change ourselves here
 580         if ( width == wxDefaultCoord || width == widthCurrent )
 581         {
 582             // size doesn't change, what about position?
 583             int xCurrent, yCurrent;
 584             DoGetPosition(&xCurrent, &yCurrent);
 585             const bool defMeansUnchanged = !(sizeFlags & wxSIZE_ALLOW_MINUS_ONE);
 586             if ( ((x == wxDefaultCoord && defMeansUnchanged) || x == xCurrent)
 587                     &&
 588                  ((y == wxDefaultCoord && defMeansUnchanged) || y == yCurrent) )
 589             {
 590                 // nothing changes, nothing to do
 591                 return;
 592             }
 593         }
 594
 595         // We cannot pass wxDefaultCoord as height to wxControl. wxControl uses
 596         // wxGetWindowRect() to determine the current height of the combobox,
 597         // and then again sets the combobox's height to that value. Unfortunately,
 598         // wxGetWindowRect doesn't include the dropdown list's height (at least
 599         // on Win2K), so this would result in a combobox with dropdown height of
 600         // 1 pixel. We have to determine the default height ourselves and call
 601         // wxControl with that value instead.
 602         //
 603         // Also notice that sometimes CB_GETDROPPEDCONTROLRECT seems to return
 604         // wildly incorrect values (~32000) which looks like a bug in it, just
 605         // ignore them in this case
 606         RECT r;
 607         if ( ::SendMessage(GetHwnd(), CB_GETDROPPEDCONTROLRECT, 0, (LPARAM) &r)
 608                     && r.bottom < 30000 )
 609         {
 610             height = heightCurrent + r.bottom - r.top;
 611         }
 612     }
 613
 614     wxControl::DoSetSize(x, y, width, height, sizeFlags);
 615 #endif
 616 }
 617
 618 wxSize wxChoice::DoGetBestSize() const
 619 {
 620     // find the widest string
 621     int wChoice = 0;
 622     const unsigned int nItems = GetCount();
 623     for ( unsigned int i = 0; i < nItems; i++ )
 624     {
 625         int wLine;
 626         GetTextExtent(GetString(i), &wLine, NULL);
 627         if ( wLine > wChoice )
 628             wChoice = wLine;
 629     }
 630
 631     // give it some reasonable default value if there are no strings in the
 632     // list
 633     if ( wChoice == 0 )
 634         wChoice = 100;
 635
 636     // the combobox should be slightly larger than the widest string
 637     wChoice += 5*GetCharWidth();
 638
 639     wxSize best(wChoice, EDIT_HEIGHT_FROM_CHAR_HEIGHT(GetCharHeight()));
 640     CacheBestSize(best);
 641     return best;
 642 }
 643
 644 WXLRESULT wxChoice::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam)
 645 {
 646     switch ( nMsg )
 647     {
 648         case WM_LBUTTONUP:
 649             {
 650                 int x = (int)LOWORD(lParam);
 651                 int y = (int)HIWORD(lParam);
 652
 653                 // Ok, this is truly weird, but if a panel with a wxChoice
 654                 // loses the focus, then you get a *fake* WM_LBUTTONUP message
 655                 // with x = 65535 and y = 65535. Filter out this nonsense.
 656                 //
 657                 // VZ: I'd like to know how to reproduce this please...
 658                 if ( x == 65535 && y == 65535 )
 659                     return 0;
 660             }
 661             break;
 662
 663             // we have to handle both: one for the normal case and the other
 664             // for readonly
 665         case WM_CTLCOLOREDIT:
 666         case WM_CTLCOLORLISTBOX:
 667         case WM_CTLCOLORSTATIC:
 668             {
 669                 WXHDC hdc;
 670                 WXHWND hwnd;
 671                 UnpackCtlColor(wParam, lParam, &hdc, &hwnd);
 672
 673                 WXHBRUSH hbr = MSWControlColor((WXHDC)hdc, hwnd);
 674                 if ( hbr )
 675                     return (WXLRESULT)hbr;
 676                 //else: fall through to default window proc
 677             }
 678     }
 679
 680     return wxWindow::MSWWindowProc(nMsg, wParam, lParam);
 681 }
 682
 683 bool wxChoice::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 684 {
 685     /*
 686         The native control provides a great variety in the events it sends in
 687         the different selection scenarios (undoubtedly for greater amusement of
 688         the programmers using it). For the reference, here are the cases when
 689         the final selection is accepted (things are quite interesting when it
 690         is cancelled too):
 691
 692         A. Selecting with just the arrows without opening the dropdown:
 693             1. CBN_SELENDOK
 694             2. CBN_SELCHANGE
 695
 696         B. Opening dropdown with F4 and selecting with arrows:
 697             1. CBN_DROPDOWN
 698             2. many CBN_SELCHANGE while changing selection in the list
 699             3. CBN_SELENDOK
 700             4. CBN_CLOSEUP
 701
 702         C. Selecting with the mouse:
 703             1. CBN_DROPDOWN
 704             -- no intermediate CBN_SELCHANGEs --
 705             2. CBN_SELENDOK
 706             3. CBN_CLOSEUP
 707             4. CBN_SELCHANGE
 708
 709         Admire the different order of messages in all of those cases, it must
 710         surely have taken a lot of effort to Microsoft developers to achieve
 711         such originality.
 712      */
 713     switch ( param )
 714     {
 715         case CBN_DROPDOWN:
 716             // we use this value both because we don't want to track selection
 717             // using CB_GETCURSEL while the dropdown is opened and because we
 718             // need to reset the selection back to it if it's eventually
 719             // cancelled by user
 720             m_lastAcceptedSelection = GetCurrentSelection();
 721             break;
 722
 723         case CBN_CLOSEUP:
 724             // if the selection was accepted by the user, it should have been
 725             // reset to wxID_NONE by CBN_SELENDOK, otherwise the selection was
 726             // cancelled and we must restore the old one
 727             if ( m_lastAcceptedSelection != wxID_NONE )
 728             {
 729                 SetSelection(m_lastAcceptedSelection);
 730                 m_lastAcceptedSelection = wxID_NONE;
 731             }
 732             break;
 733
 734         case CBN_SELENDOK:
 735             // reset it to prevent CBN_CLOSEUP from undoing the selection (it's
 736             // ok to reset it now as GetCurrentSelection() will now return the
 737             // same thing anyhow)
 738             m_lastAcceptedSelection = wxID_NONE;
 739
 740             {
 741                 const int n = GetSelection();
 742
 743                 wxCommandEvent event(wxEVT_COMMAND_CHOICE_SELECTED, m_windowId);
 744                 event.SetInt(n);
 745                 event.SetEventObject(this);
 746
 747                 if ( n > -1 )
 748                 {
 749                     event.SetString(GetStringSelection());
 750                     InitCommandEventWithItems(event, n);
 751                 }
 752
 753                 ProcessCommand(event);
 754             }
 755             break;
 756
 757         // don't handle CBN_SELENDCANCEL: just leave m_lastAcceptedSelection
 758         // valid and the selection will be undone in CBN_CLOSEUP above
 759
 760         // don't handle CBN_SELCHANGE neither, we don't want to generate events
 761         // while the dropdown is opened -- but do add it if we ever need this
 762
 763         default:
 764             return false;
 765     }
 766
 767     return true;
 768 }
 769
 770 WXHBRUSH wxChoice::MSWControlColor(WXHDC hDC, WXHWND hWnd)
 771 {
 772     if ( !IsEnabled() )
 773         return MSWControlColorDisabled(hDC);
 774
 775     return wxChoiceBase::MSWControlColor(hDC, hWnd);
 776 }
 777
 778 #endif // wxUSE_CHOICE && !(__SMARTPHONE__ && __WXWINCE__)