src/msw/headerctrl.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/msw/headerctrl.cpp
   3 // Purpose:     implementation of wxHeaderCtrl for wxMSW
   4 // Author:      Vadim Zeitlin
   5 // Created:     2008-12-01
   6 // RCS-ID:      $Id$
   7 // Copyright:   (c) 2008 Vadim Zeitlin <vadim@wxwidgets.org>
   8 // Licence:     wxWindows licence
   9 ///////////////////////////////////////////////////////////////////////////////
  10
  11 // ============================================================================
  12 // declarations
  13 // ============================================================================
  14
  15 // ----------------------------------------------------------------------------
  16 // headers
  17 // ----------------------------------------------------------------------------
  18
  19 // for compilers that support precompilation, includes "wx.h".
  20 #include "wx/wxprec.h"
  21
  22 #ifdef __BORLANDC__
  23     #pragma hdrstop
  24 #endif
  25
  26 #if wxUSE_HEADERCTRL
  27
  28 #ifndef WX_PRECOMP
  29     #include "wx/app.h"
  30     #include "wx/log.h"
  31 #endif // WX_PRECOMP
  32
  33 #include "wx/headerctrl.h"
  34
  35 #ifndef wxHAS_GENERIC_HEADERCTRL
  36
  37 #include "wx/imaglist.h"
  38
  39 #include "wx/msw/wrapcctl.h"
  40 #include "wx/msw/private.h"
  41
  42 #ifndef HDM_SETBITMAPMARGIN
  43     #define HDM_SETBITMAPMARGIN 0x1234
  44 #endif
  45
  46 #ifndef Header_SetBitmapMargin
  47     #define Header_SetBitmapMargin(hwnd, margin) \
  48             ::SendMessage((hwnd), HDM_SETBITMAPMARGIN, (WPARAM)(margin), 0)
  49 #endif
  50
  51 // from src/msw/listctrl.cpp
  52 extern int WXDLLIMPEXP_CORE wxMSWGetColumnClicked(NMHDR *nmhdr, POINT *ptClick);
  53
  54 // ============================================================================
  55 // wxHeaderCtrl implementation
  56 // ============================================================================
  57
  58 // ----------------------------------------------------------------------------
  59 // wxHeaderCtrl construction/destruction
  60 // ----------------------------------------------------------------------------
  61
  62 void wxHeaderCtrl::Init()
  63 {
  64     m_numColumns = 0;
  65     m_imageList = NULL;
  66     m_scrollOffset = 0;
  67 }
  68
  69 bool wxHeaderCtrl::Create(wxWindow *parent,
  70                           wxWindowID id,
  71                           const wxPoint& pos,
  72                           const wxSize& size,
  73                           long style,
  74                           const wxString& name)
  75 {
  76     // notice that we don't need InitCommonControlsEx(ICC_LISTVIEW_CLASSES)
  77     // here as we already call InitCommonControls() in wxApp initialization
  78     // code which covers this
  79
  80     if ( !CreateControl(parent, id, pos, size, style, wxDefaultValidator, name) )
  81         return false;
  82
  83     if ( !MSWCreateControl(WC_HEADER, wxT(""), pos, size) )
  84         return false;
  85
  86     // special hack for margins when using comctl32.dll v6 or later: the
  87     // default margin is too big and results in label truncation when the
  88     // column width is just about right to show it together with the sort
  89     // indicator, so reduce it to a smaller value (in principle we could even
  90     // use 0 here but this starts to look ugly)
  91     if ( wxApp::GetComCtl32Version() >= 600 )
  92     {
  93         Header_SetBitmapMargin(GetHwnd(), ::GetSystemMetrics(SM_CXEDGE));
  94     }
  95
  96     return true;
  97 }
  98
  99 WXDWORD wxHeaderCtrl::MSWGetStyle(long style, WXDWORD *exstyle) const
 100 {
 101     WXDWORD msStyle = wxControl::MSWGetStyle(style, exstyle);
 102
 103     if ( style & wxHD_ALLOW_REORDER )
 104         msStyle |= HDS_DRAGDROP;
 105
 106     // the control looks nicer with these styles and there doesn't seem to be
 107     // any reason to not use them so we always do (as for HDS_HORZ it is 0
 108     // anyhow but include it for clarity)
 109     // NOTE: don't use however HDS_FLAT because it makes the control look
 110     //       non-native when running WinXP in classic mode
 111     msStyle |= HDS_HORZ | HDS_BUTTONS | HDS_FULLDRAG | HDS_HOTTRACK;
 112
 113     return msStyle;
 114 }
 115
 116 wxHeaderCtrl::~wxHeaderCtrl()
 117 {
 118     delete m_imageList;
 119 }
 120
 121 // ----------------------------------------------------------------------------
 122 // wxHeaderCtrl scrolling
 123 // ----------------------------------------------------------------------------
 124
 125 void wxHeaderCtrl::DoSetSize(int x, int y,
 126                              int w, int h,
 127                              int sizeFlags)
 128 {
 129     wxHeaderCtrlBase::DoSetSize(x + m_scrollOffset, y, w - m_scrollOffset, h,
 130                                 sizeFlags);
 131 }
 132
 133 void wxHeaderCtrl::DoScrollHorz(int dx)
 134 {
 135     // as the native control doesn't support offsetting its contents, we use a
 136     // hack here to make it appear correctly when the parent is scrolled:
 137     // instead of scrolling or repainting we simply move the control window
 138     // itself: to be precise, offset it by the scroll increment to the left and
 139     // increment its width to still extend to the right boundary to compensate
 140     // for it (notice that dx is negative when scrolling to the right)
 141     m_scrollOffset += dx;
 142
 143     wxHeaderCtrlBase::DoSetSize(GetPosition().x + dx, -1,
 144                                 GetSize().x - dx, -1,
 145                                 wxSIZE_USE_EXISTING);
 146 }
 147
 148 // ----------------------------------------------------------------------------
 149 // wxHeaderCtrl geometry calculation
 150 // ----------------------------------------------------------------------------
 151
 152 wxSize wxHeaderCtrl::DoGetBestSize() const
 153 {
 154     RECT rc = wxGetClientRect(GetHwndOf(GetParent()));
 155     WINDOWPOS wpos;
 156     HDLAYOUT layout = { &rc, &wpos };
 157     if ( !Header_Layout(GetHwnd(), &layout) )
 158     {
 159         wxLogLastError(wxT("Header_Layout"));
 160         return wxControl::DoGetBestSize();
 161     }
 162
 163     return wxSize(wpos.cx, wpos.cy);
 164 }
 165
 166 // ----------------------------------------------------------------------------
 167 // wxHeaderCtrl columns managements
 168 // ----------------------------------------------------------------------------
 169
 170 unsigned int wxHeaderCtrl::DoGetCount() const
 171 {
 172     // we can't use Header_GetItemCount() here because it doesn't take the
 173     // hidden columns into account and we can't find the hidden columns after
 174     // the last shown one in MSWFromNativeIdx() without knowing where to stop
 175     // so we have to store the columns count internally
 176     return m_numColumns;
 177 }
 178
 179 int wxHeaderCtrl::GetShownColumnsCount() const
 180 {
 181     const int numItems = Header_GetItemCount(GetHwnd());
 182
 183     wxASSERT_MSG( numItems >= 0 && (unsigned)numItems <= m_numColumns,
 184                   "unexpected number of items in the native control" );
 185
 186     return numItems;
 187 }
 188
 189 void wxHeaderCtrl::DoSetCount(unsigned int count)
 190 {
 191     unsigned n;
 192
 193     // first delete all old columns
 194     const unsigned countOld = GetShownColumnsCount();
 195     for ( n = 0; n < countOld; n++ )
 196     {
 197         if ( !Header_DeleteItem(GetHwnd(), 0) )
 198         {
 199             wxLogLastError(wxT("Header_DeleteItem"));
 200         }
 201     }
 202
 203     // update the column indices order array before changing m_numColumns
 204     DoResizeColumnIndices(m_colIndices, count);
 205
 206     // and add the new ones
 207     m_numColumns = count;
 208     m_isHidden.resize(m_numColumns);
 209     for ( n = 0; n < count; n++ )
 210     {
 211         const wxHeaderColumn& col = GetColumn(n);
 212         if ( col.IsShown() )
 213         {
 214             m_isHidden[n] = false;
 215
 216             DoInsertItem(col, n);
 217         }
 218         else // hidden initially
 219         {
 220             m_isHidden[n] = true;
 221         }
 222     }
 223 }
 224
 225 void wxHeaderCtrl::DoUpdate(unsigned int idx)
 226 {
 227     // the native control does provide Header_SetItem() but it's inconvenient
 228     // to use it because it sends HDN_ITEMCHANGING messages and we'd have to
 229     // arrange not to block setting the width from there and the logic would be
 230     // more complicated as we'd have to reset the old values as well as setting
 231     // the new ones -- so instead just recreate the column
 232
 233     const wxHeaderColumn& col = GetColumn(idx);
 234     if ( col.IsHidden() )
 235     {
 236         // column is hidden now
 237         if ( !m_isHidden[idx] )
 238         {
 239             // but it wasn't hidden before, so remove it
 240             Header_DeleteItem(GetHwnd(), MSWToNativeIdx(idx));
 241
 242             m_isHidden[idx] = true;
 243         }
 244         //else: nothing to do, updating hidden column doesn't have any effect
 245     }
 246     else // column is shown now
 247     {
 248         if ( m_isHidden[idx] )
 249         {
 250             m_isHidden[idx] = false;
 251         }
 252         else // and it was shown before as well
 253         {
 254             // we need to remove the old column
 255             Header_DeleteItem(GetHwnd(), MSWToNativeIdx(idx));
 256         }
 257
 258         DoInsertItem(col, idx);
 259     }
 260 }
 261
 262 void wxHeaderCtrl::DoInsertItem(const wxHeaderColumn& col, unsigned int idx)
 263 {
 264     wxASSERT_MSG( !col.IsHidden(), "should only be called for shown columns" );
 265
 266     wxHDITEM hdi;
 267
 268     // notice that we need to store the string we use the pointer to until we
 269     // pass it to the control
 270     hdi.mask |= HDI_TEXT;
 271     wxWxCharBuffer buf = col.GetTitle().wx_str();
 272     hdi.pszText = buf.data();
 273     hdi.cchTextMax = wxStrlen(buf);
 274
 275     const wxBitmap bmp = col.GetBitmap();
 276     if ( bmp.IsOk() )
 277     {
 278         hdi.mask |= HDI_IMAGE;
 279
 280         if ( bmp.IsOk() )
 281         {
 282             const int bmpWidth = bmp.GetWidth(),
 283                       bmpHeight = bmp.GetHeight();
 284
 285             if ( !m_imageList )
 286             {
 287                 m_imageList = new wxImageList(bmpWidth, bmpHeight);
 288                 (void) // suppress mingw32 warning about unused computed value
 289                 Header_SetImageList(GetHwnd(), GetHimagelistOf(m_imageList));
 290             }
 291             else // already have an image list
 292             {
 293                 // check that all bitmaps we use have the same size
 294                 int imageWidth,
 295                     imageHeight;
 296                 m_imageList->GetSize(0, imageWidth, imageHeight);
 297
 298                 wxASSERT_MSG( imageWidth == bmpWidth && imageHeight == bmpHeight,
 299                               "all column bitmaps must have the same size" );
 300             }
 301
 302             m_imageList->Add(bmp);
 303             hdi.iImage = m_imageList->GetImageCount() - 1;
 304         }
 305         else // no bitmap but we still need to update the item
 306         {
 307             hdi.iImage = I_IMAGENONE;
 308         }
 309     }
 310
 311     if ( col.GetAlignment() != wxALIGN_NOT )
 312     {
 313         hdi.mask |= HDI_FORMAT | HDF_LEFT;
 314         switch ( col.GetAlignment() )
 315         {
 316             case wxALIGN_LEFT:
 317                 hdi.fmt |= HDF_LEFT;
 318                 break;
 319
 320             case wxALIGN_CENTER:
 321             case wxALIGN_CENTER_HORIZONTAL:
 322                 hdi.fmt |= HDF_CENTER;
 323                 break;
 324
 325             case wxALIGN_RIGHT:
 326                 hdi.fmt |= HDF_RIGHT;
 327                 break;
 328
 329             default:
 330                 wxFAIL_MSG( "invalid column header alignment" );
 331         }
 332     }
 333
 334     if ( col.IsSortKey() )
 335     {
 336         hdi.mask |= HDI_FORMAT;
 337         hdi.fmt |= col.IsSortOrderAscending() ? HDF_SORTUP : HDF_SORTDOWN;
 338     }
 339
 340     if ( col.GetWidth() != wxCOL_WIDTH_DEFAULT )
 341     {
 342         hdi.mask |= HDI_WIDTH;
 343         hdi.cxy = col.GetWidth();
 344     }
 345
 346     hdi.mask |= HDI_ORDER;
 347     hdi.iOrder = MSWToNativeOrder(m_colIndices.Index(idx));
 348
 349     if ( ::SendMessage(GetHwnd(), HDM_INSERTITEM,
 350                        MSWToNativeIdx(idx), (LPARAM)&hdi) == -1 )
 351     {
 352         wxLogLastError(wxT("Header_InsertItem()"));
 353     }
 354 }
 355
 356 void wxHeaderCtrl::DoSetColumnsOrder(const wxArrayInt& order)
 357 {
 358     wxArrayInt orderShown;
 359     orderShown.reserve(m_numColumns);
 360
 361     for ( unsigned n = 0; n < m_numColumns; n++ )
 362     {
 363         const int idx = order[n];
 364         if ( GetColumn(idx).IsShown() )
 365             orderShown.push_back(MSWToNativeIdx(idx));
 366     }
 367
 368     if ( !Header_SetOrderArray(GetHwnd(), orderShown.size(), &orderShown[0]) )
 369     {
 370         wxLogLastError(wxT("Header_GetOrderArray"));
 371     }
 372
 373     m_colIndices = order;
 374 }
 375
 376 wxArrayInt wxHeaderCtrl::DoGetColumnsOrder() const
 377 {
 378     // we don't use Header_GetOrderArray() here because it doesn't return
 379     // information about the hidden columns, instead we just save the columns
 380     // order array in DoSetColumnsOrder() and update it when they're reordered
 381     return m_colIndices;
 382 }
 383
 384 // ----------------------------------------------------------------------------
 385 // wxHeaderCtrl indexes and positions translation
 386 // ----------------------------------------------------------------------------
 387
 388 int wxHeaderCtrl::MSWToNativeIdx(int idx)
 389 {
 390     // don't check for GetColumn(idx).IsShown() as it could have just became
 391     // false and we may be called from DoUpdate() to delete the old column
 392     wxASSERT_MSG( !m_isHidden[idx],
 393                   "column must be visible to have an "
 394                   "index in the native control" );
 395
 396     int item = idx;
 397     for ( int i = 0; i < idx; i++ )
 398     {
 399         if ( GetColumn(i).IsHidden() )
 400             item--; // one less column the native control knows about
 401     }
 402
 403     wxASSERT_MSG( item >= 0 && item <= GetShownColumnsCount(), "logic error" );
 404
 405     return item;
 406 }
 407
 408 int wxHeaderCtrl::MSWFromNativeIdx(int item)
 409 {
 410     wxASSERT_MSG( item >= 0 && item < GetShownColumnsCount(),
 411                   "column index out of range" );
 412
 413     // reverse the above function
 414
 415     unsigned idx = item;
 416     for ( unsigned n = 0; n < m_numColumns; n++ )
 417     {
 418         if ( n > idx )
 419             break;
 420
 421         if ( GetColumn(n).IsHidden() )
 422             idx++;
 423     }
 424
 425     wxASSERT_MSG( MSWToNativeIdx(idx) == item, "logic error" );
 426
 427     return idx;
 428 }
 429
 430 int wxHeaderCtrl::MSWToNativeOrder(int pos)
 431 {
 432     wxASSERT_MSG( pos >= 0 && static_cast<unsigned>(pos) < m_numColumns,
 433                   "column position out of range" );
 434
 435     int order = pos;
 436     for ( int n = 0; n < pos; n++ )
 437     {
 438         if ( GetColumn(m_colIndices[n]).IsHidden() )
 439             order--;
 440     }
 441
 442     wxASSERT_MSG( order >= 0 && order <= GetShownColumnsCount(), "logic error" );
 443
 444     return order;
 445 }
 446
 447 int wxHeaderCtrl::MSWFromNativeOrder(int order)
 448 {
 449     wxASSERT_MSG( order >= 0 && order < GetShownColumnsCount(),
 450                   "native column position out of range" );
 451
 452     unsigned pos = order;
 453     for ( unsigned n = 0; n < m_numColumns; n++ )
 454     {
 455         if ( n > pos )
 456             break;
 457
 458         if ( GetColumn(m_colIndices[n]).IsHidden() )
 459             pos++;
 460     }
 461
 462     wxASSERT_MSG( MSWToNativeOrder(pos) == order, "logic error" );
 463
 464     return pos;
 465 }
 466
 467 // ----------------------------------------------------------------------------
 468 // wxHeaderCtrl events
 469 // ----------------------------------------------------------------------------
 470
 471 wxEventType wxHeaderCtrl::GetClickEventType(bool dblclk, int button)
 472 {
 473     wxEventType evtType;
 474     switch ( button )
 475     {
 476         case 0:
 477             evtType = dblclk ? wxEVT_COMMAND_HEADER_DCLICK
 478                              : wxEVT_COMMAND_HEADER_CLICK;
 479             break;
 480
 481         case 1:
 482             evtType = dblclk ? wxEVT_COMMAND_HEADER_RIGHT_DCLICK
 483                              : wxEVT_COMMAND_HEADER_RIGHT_CLICK;
 484             break;
 485
 486         case 2:
 487             evtType = dblclk ? wxEVT_COMMAND_HEADER_MIDDLE_DCLICK
 488                              : wxEVT_COMMAND_HEADER_MIDDLE_CLICK;
 489             break;
 490
 491         default:
 492             wxFAIL_MSG( wxS("unexpected event type") );
 493             evtType = wxEVT_NULL;
 494     }
 495
 496     return evtType;
 497 }
 498
 499 bool wxHeaderCtrl::MSWOnNotify(int idCtrl, WXLPARAM lParam, WXLPARAM *result)
 500 {
 501     NMHEADER * const nmhdr = (NMHEADER *)lParam;
 502
 503     wxEventType evtType = wxEVT_NULL;
 504     int width = 0;
 505     int order = -1;
 506     bool veto = false;
 507     const UINT code = nmhdr->hdr.code;
 508
 509     // we don't have the index for all events, e.g. not for NM_RELEASEDCAPTURE
 510     // so only access for header control events (and yes, the direction of
 511     // comparisons with FIRST/LAST is correct even if it seems inverted)
 512     int idx = code <= HDN_FIRST && code > HDN_LAST ? nmhdr->iItem : -1;
 513     if ( idx != -1 )
 514     {
 515         // we also get bogus HDN_BEGINDRAG with -1 index so don't call
 516         // MSWFromNativeIdx() unconditionally for nmhdr->iItem
 517         idx = MSWFromNativeIdx(idx);
 518     }
 519
 520     switch ( code )
 521     {
 522         // click events
 523         // ------------
 524
 525         case HDN_ITEMCLICK:
 526         case HDN_ITEMDBLCLICK:
 527             evtType = GetClickEventType(code == HDN_ITEMDBLCLICK, nmhdr->iButton);
 528             break;
 529
 530             // although we should get the notifications about the right clicks
 531             // via HDN_ITEM[DBL]CLICK too according to MSDN this simply doesn't
 532             // happen in practice on any Windows system up to 2003
 533         case NM_RCLICK:
 534         case NM_RDBLCLK:
 535             {
 536                 POINT pt;
 537                 idx = wxMSWGetColumnClicked(&nmhdr->hdr, &pt);
 538                 if ( idx != wxNOT_FOUND )
 539                 {
 540                     idx = MSWFromNativeIdx(idx);
 541
 542                     // due to a bug in mingw32 headers NM_RDBLCLK is signed
 543                     // there so we need a cast to avoid warnings about signed/
 544                     // unsigned comparison
 545                     evtType = GetClickEventType(
 546                                 code == static_cast<UINT>(NM_RDBLCLK), 1);
 547                 }
 548                 //else: ignore clicks outside any column
 549             }
 550             break;
 551
 552         case HDN_DIVIDERDBLCLICK:
 553             evtType = wxEVT_COMMAND_HEADER_SEPARATOR_DCLICK;
 554             break;
 555
 556
 557         // column resizing events
 558         // ----------------------
 559
 560         // see comments in wxListCtrl::MSWOnNotify() for why we catch both
 561         // ASCII and Unicode versions of this message
 562         case HDN_BEGINTRACKA:
 563         case HDN_BEGINTRACKW:
 564             // non-resizeable columns can't be resized no matter what, don't
 565             // even generate any events for them
 566             if ( !GetColumn(idx).IsResizeable() )
 567             {
 568                 veto = true;
 569                 break;
 570             }
 571
 572             evtType = wxEVT_COMMAND_HEADER_BEGIN_RESIZE;
 573             // fall through
 574
 575         case HDN_ENDTRACKA:
 576         case HDN_ENDTRACKW:
 577             width = nmhdr->pitem->cxy;
 578
 579             if ( evtType == wxEVT_NULL )
 580             {
 581                 evtType = wxEVT_COMMAND_HEADER_END_RESIZE;
 582
 583                 // don't generate events with invalid width
 584                 const int minWidth = GetColumn(idx).GetMinWidth();
 585                 if ( width < minWidth )
 586                     width = minWidth;
 587             }
 588             break;
 589
 590         case HDN_ITEMCHANGING:
 591             if ( nmhdr->pitem && (nmhdr->pitem->mask & HDI_WIDTH) )
 592             {
 593                 // prevent the column from being shrunk beneath its min width
 594                 width = nmhdr->pitem->cxy;
 595                 if ( width < GetColumn(idx).GetMinWidth() )
 596                 {
 597                     // don't generate any events and prevent the change from
 598                     // happening
 599                     veto = true;
 600                 }
 601                 else // width is acceptable
 602                 {
 603                     // generate the resizing event from here as we don't seem
 604                     // to be getting HDN_TRACK events at all, at least with
 605                     // comctl32.dll v6
 606                     evtType = wxEVT_COMMAND_HEADER_RESIZING;
 607                 }
 608             }
 609             break;
 610
 611
 612         // column reordering events
 613         // ------------------------
 614
 615         case HDN_BEGINDRAG:
 616             // Windows sometimes sends us events with invalid column indices
 617             if ( nmhdr->iItem == -1 )
 618                 break;
 619
 620             // column must have the appropriate flag to be draggable
 621             if ( !GetColumn(idx).IsReorderable() )
 622             {
 623                 veto = true;
 624                 break;
 625             }
 626
 627             evtType = wxEVT_COMMAND_HEADER_BEGIN_REORDER;
 628             break;
 629
 630         case HDN_ENDDRAG:
 631             wxASSERT_MSG( nmhdr->pitem->mask & HDI_ORDER, "should have order" );
 632             order = nmhdr->pitem->iOrder;
 633
 634             // we also get messages with invalid order when column reordering
 635             // is cancelled (e.g. by pressing Esc)
 636             if ( order == -1 )
 637                 break;
 638
 639             order = MSWFromNativeOrder(order);
 640
 641             evtType = wxEVT_COMMAND_HEADER_END_REORDER;
 642             break;
 643
 644         case NM_RELEASEDCAPTURE:
 645             evtType = wxEVT_COMMAND_HEADER_DRAGGING_CANCELLED;
 646             break;
 647     }
 648
 649
 650     // do generate the corresponding wx event
 651     if ( evtType != wxEVT_NULL )
 652     {
 653         wxHeaderCtrlEvent event(evtType, GetId());
 654         event.SetEventObject(this);
 655         event.SetColumn(idx);
 656         event.SetWidth(width);
 657         if ( order != -1 )
 658             event.SetNewOrder(order);
 659
 660         const bool processed = GetEventHandler()->ProcessEvent(event);
 661
 662         if ( processed && !event.IsAllowed() )
 663             veto = true;
 664
 665         if ( !veto )
 666         {
 667             // special post-processing for HDN_ENDDRAG: we need to update the
 668             // internal column indices array if this is allowed to go ahead as
 669             // the native control is going to reorder its columns now
 670             if ( evtType == wxEVT_COMMAND_HEADER_END_REORDER )
 671                 MoveColumnInOrderArray(m_colIndices, idx, order);
 672
 673             if ( processed )
 674             {
 675                 // skip default processing below
 676                 return true;
 677             }
 678         }
 679     }
 680
 681     if ( veto )
 682     {
 683         // all of HDN_BEGIN{DRAG,TRACK}, HDN_TRACK and HDN_ITEMCHANGING
 684         // interpret TRUE return value as meaning to stop the control
 685         // default handling of the message
 686         *result = TRUE;
 687
 688         return true;
 689     }
 690
 691     return wxHeaderCtrlBase::MSWOnNotify(idCtrl, lParam, result);
 692 }
 693
 694 #endif // wxHAS_GENERIC_HEADERCTRL
 695
 696 #endif // wxUSE_HEADERCTRL