src/msw/choice.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        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 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  21     #pragma implementation "choice.h"
  22 #endif
  23
  24 // For compilers that support precompilation, includes "wx.h".
  25 #include "wx/wxprec.h"
  26
  27 #ifdef __BORLANDC__
  28     #pragma hdrstop
  29 #endif
  30
  31 #if wxUSE_CHOICE
  32
  33 #ifndef WX_PRECOMP
  34     #include "wx/choice.h"
  35     #include "wx/utils.h"
  36     #include "wx/log.h"
  37     #include "wx/brush.h"
  38     #include "wx/settings.h"
  39 #endif
  40
  41 #include "wx/msw/private.h"
  42
  43 #if wxUSE_EXTENDED_RTTI
  44 WX_DEFINE_FLAGS( wxChoiceStyle )
  45
  46 wxBEGIN_FLAGS( wxChoiceStyle )
  47     // new style border flags, we put them first to
  48     // use them for streaming out
  49     wxFLAGS_MEMBER(wxBORDER_SIMPLE)
  50     wxFLAGS_MEMBER(wxBORDER_SUNKEN)
  51     wxFLAGS_MEMBER(wxBORDER_DOUBLE)
  52     wxFLAGS_MEMBER(wxBORDER_RAISED)
  53     wxFLAGS_MEMBER(wxBORDER_STATIC)
  54     wxFLAGS_MEMBER(wxBORDER_NONE)
  55
  56     // old style border flags
  57     wxFLAGS_MEMBER(wxSIMPLE_BORDER)
  58     wxFLAGS_MEMBER(wxSUNKEN_BORDER)
  59     wxFLAGS_MEMBER(wxDOUBLE_BORDER)
  60     wxFLAGS_MEMBER(wxRAISED_BORDER)
  61     wxFLAGS_MEMBER(wxSTATIC_BORDER)
  62     wxFLAGS_MEMBER(wxBORDER)
  63
  64     // standard window styles
  65     wxFLAGS_MEMBER(wxTAB_TRAVERSAL)
  66     wxFLAGS_MEMBER(wxCLIP_CHILDREN)
  67     wxFLAGS_MEMBER(wxTRANSPARENT_WINDOW)
  68     wxFLAGS_MEMBER(wxWANTS_CHARS)
  69     wxFLAGS_MEMBER(wxFULL_REPAINT_ON_RESIZE)
  70     wxFLAGS_MEMBER(wxALWAYS_SHOW_SB )
  71     wxFLAGS_MEMBER(wxVSCROLL)
  72     wxFLAGS_MEMBER(wxHSCROLL)
  73
  74 wxEND_FLAGS( wxChoiceStyle )
  75
  76 IMPLEMENT_DYNAMIC_CLASS_XTI(wxChoice, wxControl,"wx/choice.h")
  77
  78 wxBEGIN_PROPERTIES_TABLE(wxChoice)
  79         wxEVENT_PROPERTY( Select , wxEVT_COMMAND_CHOICE_SELECTED , wxCommandEvent )
  80
  81     wxPROPERTY( Font , wxFont , SetFont , GetFont  , , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
  82     wxPROPERTY_COLLECTION( Choices , wxArrayString , wxString , AppendString , GetStrings , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
  83         wxPROPERTY( Selection ,int, SetSelection, GetSelection, , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
  84     wxPROPERTY_FLAGS( WindowStyle , wxChoiceStyle , long , SetWindowStyleFlag , GetWindowStyleFlag , , 0 /*flags*/ , wxT("Helpstring") , wxT("group")) // style
  85 wxEND_PROPERTIES_TABLE()
  86
  87 wxBEGIN_HANDLERS_TABLE(wxChoice)
  88 wxEND_HANDLERS_TABLE()
  89
  90 wxCONSTRUCTOR_4( wxChoice , wxWindow* , Parent , wxWindowID , Id , wxPoint , Position , wxSize , Size )
  91 #else
  92 IMPLEMENT_DYNAMIC_CLASS(wxChoice, wxControl)
  93 #endif
  94 /*
  95         TODO PROPERTIES
  96                 selection (long)
  97                 content (list)
  98                         item
  99 */
 100
 101 // ============================================================================
 102 // implementation
 103 // ============================================================================
 104
 105 // ----------------------------------------------------------------------------
 106 // creation
 107 // ----------------------------------------------------------------------------
 108
 109 bool wxChoice::Create(wxWindow *parent,
 110                       wxWindowID id,
 111                       const wxPoint& pos,
 112                       const wxSize& size,
 113                       int n, const wxString choices[],
 114                       long style,
 115                       const wxValidator& validator,
 116                       const wxString& name)
 117 {
 118     // Experience shows that wxChoice vs. wxComboBox distinction confuses
 119     // quite a few people - try to help them
 120     wxASSERT_MSG( !(style & wxCB_DROPDOWN) &&
 121                   !(style & wxCB_READONLY) &&
 122                   !(style & wxCB_SIMPLE),
 123                   _T("this style flag is ignored by wxChoice, you ")
 124                   _T("probably want to use a wxComboBox") );
 125
 126     return CreateAndInit(parent, id, pos, size, n, choices, style,
 127                          validator, name);
 128 }
 129
 130 bool wxChoice::CreateAndInit(wxWindow *parent,
 131                              wxWindowID id,
 132                              const wxPoint& pos,
 133                              const wxSize& sizeOrig,
 134                              int n, const wxString choices[],
 135                              long style,
 136                              const wxValidator& validator,
 137                              const wxString& name)
 138 {
 139     // this is a bit hackish but we want to prevent MSWCreateControl() from
 140     // calling SetBestSize() (which it would do if any of the size components
 141     // is not given) because it wouldn't calculate it correctly if we have any
 142     // strings as they're not yet added to the control when it is called
 143     //
 144     // so: if we have any strings, we fudge the size parameter so that
 145     // SetBestSize() is not called by MSWCreateControl() but then we do call it
 146     // manually below
 147     bool autoSize = false;
 148     wxSize size = sizeOrig;
 149     if ( n )
 150     {
 151         if ( size.x < 0 )
 152         {
 153             size.x = 1;
 154             autoSize = true;
 155         }
 156         if ( size.y < 0 )
 157         {
 158             size.y = 1;
 159             autoSize = true;
 160         }
 161     }
 162
 163     // initialize wxControl
 164     if ( !CreateControl(parent, id, pos, size, style, validator, name) )
 165         return FALSE;
 166
 167     // now create the real HWND
 168     if ( !MSWCreateControl(wxT("COMBOBOX"), _T(""), pos, size) )
 169         return FALSE;
 170
 171
 172     // choice/combobox normally has "white" (depends on colour scheme, of
 173     // course) background rather than inheriting the parent's background
 174     SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW));
 175
 176     // initialize the controls contents
 177     for ( int i = 0; i < n; i++ )
 178     {
 179         Append(choices[i]);
 180     }
 181
 182     // and now we may finally size the control properly (if needed)
 183     if ( autoSize )
 184     {
 185         SetBestSize(sizeOrig);
 186     }
 187
 188     return TRUE;
 189 }
 190
 191 bool wxChoice::Create(wxWindow *parent,
 192                       wxWindowID id,
 193                       const wxPoint& pos,
 194                       const wxSize& size,
 195                       const wxArrayString& choices,
 196                       long style,
 197                       const wxValidator& validator,
 198                       const wxString& name)
 199 {
 200     wxCArrayString chs(choices);
 201     return Create(parent, id, pos, size, chs.GetCount(), chs.GetStrings(),
 202                   style, validator, name);
 203 }
 204
 205 WXDWORD wxChoice::MSWGetStyle(long style, WXDWORD *exstyle) const
 206 {
 207     // we never have an external border
 208     WXDWORD msStyle = wxControl::MSWGetStyle
 209                       (
 210                         (style & ~wxBORDER_MASK) | wxBORDER_NONE, exstyle
 211                       );
 212
 213     // WS_CLIPSIBLINGS is useful with wxChoice and doesn't seem to result in
 214     // any problems
 215     msStyle |= WS_CLIPSIBLINGS;
 216
 217     // wxChoice-specific styles
 218     msStyle |= CBS_DROPDOWNLIST | WS_HSCROLL | WS_VSCROLL;
 219     if ( style & wxCB_SORT )
 220         msStyle |= CBS_SORT;
 221
 222     return msStyle;
 223 }
 224
 225 wxChoice::~wxChoice()
 226 {
 227     Free();
 228 }
 229
 230 // ----------------------------------------------------------------------------
 231 // adding/deleting items to/from the list
 232 // ----------------------------------------------------------------------------
 233
 234 int wxChoice::DoAppend(const wxString& item)
 235 {
 236     int n = (int)SendMessage(GetHwnd(), CB_ADDSTRING, 0, (LPARAM)item.c_str());
 237     if ( n == CB_ERR )
 238     {
 239         wxLogLastError(wxT("SendMessage(CB_ADDSTRING)"));
 240     }
 241     else // ok
 242     {
 243         // we need to refresh our size in order to have enough space for the
 244         // newly added items
 245         UpdateVisibleHeight();
 246     }
 247
 248     return n;
 249 }
 250
 251 int wxChoice::DoInsert(const wxString& item, int pos)
 252 {
 253     wxCHECK_MSG(!(GetWindowStyle() & wxCB_SORT), -1, wxT("can't insert into sorted list"));
 254     wxCHECK_MSG((pos>=0) && (pos<=GetCount()), -1, wxT("invalid index"));
 255
 256     int n = (int)SendMessage(GetHwnd(), CB_INSERTSTRING, pos, (LPARAM)item.c_str());
 257     if ( n == CB_ERR )
 258     {
 259         wxLogLastError(wxT("SendMessage(CB_INSERTSTRING)"));
 260     }
 261     else // ok
 262     {
 263         UpdateVisibleHeight();
 264     }
 265
 266     return n;
 267 }
 268
 269 void wxChoice::Delete(int n)
 270 {
 271     wxCHECK_RET( n < GetCount(), wxT("invalid item index in wxChoice::Delete") );
 272
 273     if ( HasClientObjectData() )
 274     {
 275         delete GetClientObject(n);
 276     }
 277
 278     SendMessage(GetHwnd(), CB_DELETESTRING, n, 0);
 279
 280     UpdateVisibleHeight();
 281 }
 282
 283 void wxChoice::Clear()
 284 {
 285     Free();
 286
 287     SendMessage(GetHwnd(), CB_RESETCONTENT, 0, 0);
 288
 289     UpdateVisibleHeight();
 290 }
 291
 292 void wxChoice::Free()
 293 {
 294     if ( HasClientObjectData() )
 295     {
 296         size_t count = GetCount();
 297         for ( size_t n = 0; n < count; n++ )
 298         {
 299             delete GetClientObject(n);
 300         }
 301     }
 302 }
 303
 304 // ----------------------------------------------------------------------------
 305 // selection
 306 // ----------------------------------------------------------------------------
 307
 308 int wxChoice::GetSelection() const
 309 {
 310     return (int)SendMessage(GetHwnd(), CB_GETCURSEL, 0, 0);
 311 }
 312
 313 void wxChoice::SetSelection(int n)
 314 {
 315     SendMessage(GetHwnd(), CB_SETCURSEL, n, 0);
 316 }
 317
 318 // ----------------------------------------------------------------------------
 319 // string list functions
 320 // ----------------------------------------------------------------------------
 321
 322 int wxChoice::GetCount() const
 323 {
 324     return (int)SendMessage(GetHwnd(), CB_GETCOUNT, 0, 0);
 325 }
 326
 327 int wxChoice::FindString(const wxString& s) const
 328 {
 329 #if defined(__WATCOMC__) && defined(__WIN386__)
 330     // For some reason, Watcom in WIN386 mode crashes in the CB_FINDSTRINGEXACT message.
 331     // wxChoice::Do it the long way instead.
 332     int count = GetCount();
 333     for ( int i = 0; i < count; i++ )
 334     {
 335         // as CB_FINDSTRINGEXACT is case insensitive, be case insensitive too
 336         if ( GetString(i).IsSameAs(s, FALSE) )
 337             return i;
 338     }
 339
 340     return wxNOT_FOUND;
 341 #else // !Watcom
 342     int pos = (int)SendMessage(GetHwnd(), CB_FINDSTRINGEXACT,
 343                                (WPARAM)-1, (LPARAM)s.c_str());
 344
 345     return pos == LB_ERR ? wxNOT_FOUND : pos;
 346 #endif // Watcom/!Watcom
 347 }
 348
 349 void wxChoice::SetString(int n, const wxString& s)
 350 {
 351     wxCHECK_RET( n >= 0 && n < GetCount(),
 352                  wxT("invalid item index in wxChoice::SetString") );
 353
 354     // we have to delete and add back the string as there is no way to change a
 355     // string in place
 356
 357     // we need to preserve the client data
 358     void *data;
 359     if ( m_clientDataItemsType != wxClientData_None )
 360     {
 361         data = DoGetItemClientData(n);
 362     }
 363     else // no client data
 364     {
 365         data = NULL;
 366     }
 367
 368     ::SendMessage(GetHwnd(), CB_DELETESTRING, n, 0);
 369     ::SendMessage(GetHwnd(), CB_INSERTSTRING, n, (LPARAM)s.c_str() );
 370
 371     if ( data )
 372     {
 373         DoSetItemClientData(n, data);
 374     }
 375     //else: it's already NULL by default
 376 }
 377
 378 wxString wxChoice::GetString(int n) const
 379 {
 380     int len = (int)::SendMessage(GetHwnd(), CB_GETLBTEXTLEN, n, 0);
 381
 382     wxString str;
 383     if ( len != CB_ERR && len > 0 )
 384     {
 385         if ( ::SendMessage
 386                (
 387                 GetHwnd(),
 388                 CB_GETLBTEXT,
 389                 n,
 390                 (LPARAM)(wxChar *)wxStringBuffer(str, len)
 391                ) == CB_ERR )
 392         {
 393             wxLogLastError(wxT("SendMessage(CB_GETLBTEXT)"));
 394         }
 395     }
 396
 397     return str;
 398 }
 399
 400 // ----------------------------------------------------------------------------
 401 // client data
 402 // ----------------------------------------------------------------------------
 403
 404 void wxChoice::DoSetItemClientData( int n, void* clientData )
 405 {
 406     if ( ::SendMessage(GetHwnd(), CB_SETITEMDATA,
 407                        n, (LPARAM)clientData) == CB_ERR )
 408     {
 409         wxLogLastError(wxT("CB_SETITEMDATA"));
 410     }
 411 }
 412
 413 void* wxChoice::DoGetItemClientData( int n ) const
 414 {
 415     LPARAM rc = SendMessage(GetHwnd(), CB_GETITEMDATA, n, 0);
 416     if ( rc == CB_ERR )
 417     {
 418         wxLogLastError(wxT("CB_GETITEMDATA"));
 419
 420         // unfortunately, there is no way to return an error code to the user
 421         rc = (LPARAM) NULL;
 422     }
 423
 424     return (void *)rc;
 425 }
 426
 427 void wxChoice::DoSetItemClientObject( int n, wxClientData* clientData )
 428 {
 429     DoSetItemClientData(n, clientData);
 430 }
 431
 432 wxClientData* wxChoice::DoGetItemClientObject( int n ) const
 433 {
 434     return (wxClientData *)DoGetItemClientData(n);
 435 }
 436
 437 // ----------------------------------------------------------------------------
 438 // wxMSW specific helpers
 439 // ----------------------------------------------------------------------------
 440
 441 void wxChoice::UpdateVisibleHeight()
 442 {
 443     // be careful to not change the width here
 444     DoSetSize(-1, -1, -1, GetSize().y, wxSIZE_USE_EXISTING);
 445 }
 446
 447 void wxChoice::DoMoveWindow(int x, int y, int width, int height)
 448 {
 449     // here is why this is necessary: if the width is negative, the combobox
 450     // window proc makes the window of the size width*height instead of
 451     // interpreting height in the usual manner (meaning the height of the drop
 452     // down list - usually the height specified in the call to MoveWindow()
 453     // will not change the height of combo box per se)
 454     //
 455     // this behaviour is not documented anywhere, but this is just how it is
 456     // here (NT 4.4) and, anyhow, the check shouldn't hurt - however without
 457     // the check, constraints/sizers using combos may break the height
 458     // constraint will have not at all the same value as expected
 459     if ( width < 0 )
 460         return;
 461
 462     wxControl::DoMoveWindow(x, y, width, height);
 463 }
 464
 465 void wxChoice::DoGetSize(int *w, int *h) const
 466 {
 467     // this is weird: sometimes, the height returned by Windows is clearly the
 468     // total height of the control including the drop down list -- but only
 469     // sometimes, and normally it isn't... I have no idea about what to do with
 470     // this
 471     wxControl::DoGetSize(w, h);
 472 }
 473
 474 void wxChoice::DoSetSize(int x, int y,
 475                          int width, int height,
 476                          int sizeFlags)
 477 {
 478     int heightOrig = height;
 479
 480     // the height which we must pass to Windows should be the total height of
 481     // the control including the drop down list while the height given to us
 482     // is, of course, just the height of the permanently visible part of it
 483     if ( height != -1 )
 484     {
 485         // don't make the drop down list too tall, arbitrarily limit it to 40
 486         // items max and also don't leave it empty
 487         size_t nItems = GetCount();
 488         if ( !nItems )
 489             nItems = 9;
 490         else if ( nItems > 39 )
 491             nItems = 39;
 492
 493         // add space for the drop down list
 494         const int hItem = SendMessage(GetHwnd(), CB_GETITEMHEIGHT, 0, 0);
 495         height += hItem*(nItems + 1);
 496     }
 497
 498     wxControl::DoSetSize(x, y, width, height, sizeFlags);
 499
 500     // if the height specified for the visible part of the control is
 501     // different from the current one, we need to change it separately
 502     // as it is not affected by normal WM_SETSIZE
 503     if ( height != -1 )
 504     {
 505         const int delta = heightOrig - GetSize().y;
 506         if ( delta )
 507         {
 508             int h = ::SendMessage(GetHwnd(), CB_GETITEMHEIGHT, (WPARAM)-1, 0);
 509             SendMessage(GetHwnd(), CB_SETITEMHEIGHT, (WPARAM)-1, h + delta);
 510         }
 511     }
 512 }
 513
 514 wxSize wxChoice::DoGetBestSize() const
 515 {
 516     // find the widest string
 517     int wChoice = 0;
 518     const size_t nItems = GetCount();
 519     for ( size_t i = 0; i < nItems; i++ )
 520     {
 521         int wLine;
 522         GetTextExtent(GetString(i), &wLine, NULL);
 523         if ( wLine > wChoice )
 524             wChoice = wLine;
 525     }
 526
 527     // give it some reasonable default value if there are no strings in the
 528     // list
 529     if ( wChoice == 0 )
 530         wChoice = 100;
 531
 532     // the combobox should be slightly larger than the widest string
 533     wChoice += 5*GetCharWidth();
 534
 535     // +5 is magic but seems to work well
 536     return wxSize(wChoice, GetCharHeight() + 5);
 537 }
 538
 539 WXLRESULT wxChoice::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam)
 540 {
 541     if ( nMsg == WM_LBUTTONUP )
 542     {
 543         int x = (int)LOWORD(lParam);
 544         int y = (int)HIWORD(lParam);
 545
 546         // Ok, this is truly weird, but if a panel with a wxChoice loses the
 547         // focus, then you get a *fake* WM_LBUTTONUP message with x = 65535 and
 548         // y = 65535. Filter out this nonsense.
 549         //
 550         // VZ: I'd like to know how to reproduce this please...
 551         if ( x == 65535 && y == 65535 )
 552             return 0;
 553     }
 554
 555     return wxWindow::MSWWindowProc(nMsg, wParam, lParam);
 556 }
 557
 558 bool wxChoice::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 559 {
 560     if ( param != CBN_SELCHANGE)
 561     {
 562         // "selection changed" is the only event we're after
 563         return FALSE;
 564     }
 565
 566     int n = GetSelection();
 567     if (n > -1)
 568     {
 569         wxCommandEvent event(wxEVT_COMMAND_CHOICE_SELECTED, m_windowId);
 570         event.SetInt(n);
 571         event.SetEventObject(this);
 572         event.SetString(GetStringSelection());
 573         if ( HasClientObjectData() )
 574             event.SetClientObject( GetClientObject(n) );
 575         else if ( HasClientUntypedData() )
 576             event.SetClientData( GetClientData(n) );
 577         ProcessCommand(event);
 578     }
 579
 580     return TRUE;
 581 }
 582
 583 WXHBRUSH wxChoice::OnCtlColor(WXHDC pDC, WXHWND WXUNUSED(pWnd), WXUINT WXUNUSED(nCtlColor),
 584                                WXUINT WXUNUSED(message),
 585                                WXWPARAM WXUNUSED(wParam),
 586                                WXLPARAM WXUNUSED(lParam)
 587      )
 588 {
 589     HDC hdc = (HDC)pDC;
 590     wxColour colBack = GetBackgroundColour();
 591
 592     if (!IsEnabled())
 593         colBack = wxSystemSettings::GetColour(wxSYS_COLOUR_3DFACE);
 594
 595     ::SetBkColor(hdc, wxColourToRGB(colBack));
 596     ::SetTextColor(hdc, wxColourToRGB(GetForegroundColour()));
 597
 598     wxBrush *brush = wxTheBrushList->FindOrCreateBrush(colBack, wxSOLID);
 599
 600     return (WXHBRUSH)brush->GetResourceHandle();
 601 }
 602
 603 #endif // wxUSE_CHOICE