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     m_colBeingDragged = -1;
  68 }
  69
  70 bool wxHeaderCtrl::Create(wxWindow *parent,
  71                           wxWindowID id,
  72                           const wxPoint& pos,
  73                           const wxSize& size,
  74                           long style,
  75                           const wxString& name)
  76 {
  77     // notice that we don't need InitCommonControlsEx(ICC_LISTVIEW_CLASSES)
  78     // here as we already call InitCommonControls() in wxApp initialization
  79     // code which covers this
  80
  81     if ( !CreateControl(parent, id, pos, size, style, wxDefaultValidator, name) )
  82         return false;
  83
  84     if ( !MSWCreateControl(WC_HEADER, wxT(""), pos, size) )
  85         return false;
  86
  87     // special hack for margins when using comctl32.dll v6 or later: the
  88     // default margin is too big and results in label truncation when the
  89     // column width is just about right to show it together with the sort
  90     // indicator, so reduce it to a smaller value (in principle we could even
  91     // use 0 here but this starts to look ugly)
  92     if ( wxApp::GetComCtl32Version() >= 600 )
  93     {
  94         Header_SetBitmapMargin(GetHwnd(), ::GetSystemMetrics(SM_CXEDGE));
  95     }
  96
  97     return true;
  98 }
  99
 100 WXDWORD wxHeaderCtrl::MSWGetStyle(long style, WXDWORD *exstyle) const
 101 {
 102     WXDWORD msStyle = wxControl::MSWGetStyle(style, exstyle);
 103
 104     if ( style & wxHD_ALLOW_REORDER )
 105         msStyle |= HDS_DRAGDROP;
 106
 107     // the control looks nicer with these styles and there doesn't seem to be
 108     // any reason to not use them so we always do (as for HDS_HORZ it is 0
 109     // anyhow but include it for clarity)
 110     // NOTE: don't use however HDS_FLAT because it makes the control look
 111     //       non-native when running WinXP in classic mode
 112     msStyle |= HDS_HORZ | HDS_BUTTONS | HDS_FULLDRAG | HDS_HOTTRACK;
 113
 114     return msStyle;
 115 }
 116
 117 wxHeaderCtrl::~wxHeaderCtrl()
 118 {
 119     delete m_imageList;
 120 }
 121
 122 // ----------------------------------------------------------------------------
 123 // wxHeaderCtrl scrolling
 124 // ----------------------------------------------------------------------------
 125
 126 void wxHeaderCtrl::DoSetSize(int x, int y,
 127                              int w, int h,
 128                              int sizeFlags)
 129 {
 130     wxHeaderCtrlBase::DoSetSize(x + m_scrollOffset, y, w - m_scrollOffset, h,
 131                                 sizeFlags);
 132 }
 133
 134 void wxHeaderCtrl::DoScrollHorz(int dx)
 135 {
 136     // as the native control doesn't support offsetting its contents, we use a
 137     // hack here to make it appear correctly when the parent is scrolled:
 138     // instead of scrolling or repainting we simply move the control window
 139     // itself: to be precise, offset it by the scroll increment to the left and
 140     // increment its width to still extend to the right boundary to compensate
 141     // for it (notice that dx is negative when scrolling to the right)
 142     m_scrollOffset += dx;
 143
 144     wxHeaderCtrlBase::DoSetSize(GetPosition().x + dx, -1,
 145                                 GetSize().x - dx, -1,
 146                                 wxSIZE_USE_EXISTING);
 147 }
 148
 149 // ----------------------------------------------------------------------------
 150 // wxHeaderCtrl geometry calculation
 151 // ----------------------------------------------------------------------------
 152
 153 wxSize wxHeaderCtrl::DoGetBestSize() const
 154 {
 155     RECT rc = wxGetClientRect(GetHwndOf(GetParent()));
 156     WINDOWPOS wpos;
 157     HDLAYOUT layout = { &rc, &wpos };
 158     if ( !Header_Layout(GetHwnd(), &layout) )
 159     {
 160         wxLogLastError(wxT("Header_Layout"));
 161         return wxControl::DoGetBestSize();
 162     }
 163
 164     return wxSize(wpos.cx, wpos.cy);
 165 }
 166
 167 // ----------------------------------------------------------------------------
 168 // wxHeaderCtrl columns managements
 169 // ----------------------------------------------------------------------------
 170
 171 unsigned int wxHeaderCtrl::DoGetCount() const
 172 {
 173     // we can't use Header_GetItemCount() here because it doesn't take the
 174     // hidden columns into account and we can't find the hidden columns after
 175     // the last shown one in MSWFromNativeIdx() without knowing where to stop
 176     // so we have to store the columns count internally
 177     return m_numColumns;
 178 }
 179
 180 int wxHeaderCtrl::GetShownColumnsCount() const
 181 {
 182     const int numItems = Header_GetItemCount(GetHwnd());
 183
 184     wxASSERT_MSG( numItems >= 0 && (unsigned)numItems <= m_numColumns,
 185                   "unexpected number of items in the native control" );
 186
 187     return numItems;
 188 }
 189
 190 void wxHeaderCtrl::DoSetCount(unsigned int count)
 191 {
 192     unsigned n;
 193
 194     // first delete all old columns
 195     const unsigned countOld = GetShownColumnsCount();
 196     for ( n = 0; n < countOld; n++ )
 197     {
 198         if ( !Header_DeleteItem(GetHwnd(), 0) )
 199         {
 200             wxLogLastError(wxT("Header_DeleteItem"));
 201         }
 202     }
 203
 204     // update the column indices order array before changing m_numColumns
 205     DoResizeColumnIndices(m_colIndices, count);
 206
 207     // and add the new ones
 208     m_numColumns = count;
 209     m_isHidden.resize(m_numColumns);
 210     for ( n = 0; n < count; n++ )
 211     {
 212         const wxHeaderColumn& col = GetColumn(n);
 213         if ( col.IsShown() )
 214         {
 215             m_isHidden[n] = false;
 216
 217             DoInsertItem(col, n);
 218         }
 219         else // hidden initially
 220         {
 221             m_isHidden[n] = true;
 222         }
 223     }
 224 }
 225
 226 void wxHeaderCtrl::DoUpdate(unsigned int idx)
 227 {
 228     // the native control does provide Header_SetItem() but it's inconvenient
 229     // to use it because it sends HDN_ITEMCHANGING messages and we'd have to
 230     // arrange not to block setting the width from there and the logic would be
 231     // more complicated as we'd have to reset the old values as well as setting
 232     // the new ones -- so instead just recreate the column
 233
 234     const wxHeaderColumn& col = GetColumn(idx);
 235     if ( col.IsHidden() )
 236     {
 237         // column is hidden now
 238         if ( !m_isHidden[idx] )
 239         {
 240             // but it wasn't hidden before, so remove it
 241             Header_DeleteItem(GetHwnd(), MSWToNativeIdx(idx));
 242
 243             m_isHidden[idx] = true;
 244         }
 245         //else: nothing to do, updating hidden column doesn't have any effect
 246     }
 247     else // column is shown now
 248     {
 249         if ( m_isHidden[idx] )
 250         {
 251             m_isHidden[idx] = false;
 252         }
 253         else // and it was shown before as well
 254         {
 255             // we need to remove the old column
 256             Header_DeleteItem(GetHwnd(), MSWToNativeIdx(idx));
 257         }
 258
 259         DoInsertItem(col, idx);
 260     }
 261 }
 262
 263 void wxHeaderCtrl::DoInsertItem(const wxHeaderColumn& col, unsigned int idx)
 264 {
 265     wxASSERT_MSG( !col.IsHidden(), "should only be called for shown columns" );
 266
 267     wxHDITEM hdi;
 268
 269     // notice that we need to store the string we use the pointer to until we
 270     // pass it to the control
 271     hdi.mask |= HDI_TEXT;
 272     wxWxCharBuffer buf = col.GetTitle().t_str();
 273     hdi.pszText = buf.data();
 274     hdi.cchTextMax = wxStrlen(buf);
 275
 276     const wxBitmap bmp = col.GetBitmap();
 277     if ( bmp.IsOk() )
 278     {
 279         hdi.mask |= HDI_IMAGE;
 280
 281         if ( bmp.IsOk() )
 282         {
 283             const int bmpWidth = bmp.GetWidth(),
 284                       bmpHeight = bmp.GetHeight();
 285
 286             if ( !m_imageList )
 287             {
 288                 m_imageList = new wxImageList(bmpWidth, bmpHeight);
 289                 (void) // suppress mingw32 warning about unused computed value
 290                 Header_SetImageList(GetHwnd(), GetHimagelistOf(m_imageList));
 291             }
 292             else // already have an image list
 293             {
 294                 // check that all bitmaps we use have the same size
 295                 int imageWidth,
 296                     imageHeight;
 297                 m_imageList->GetSize(0, imageWidth, imageHeight);
 298
 299                 wxASSERT_MSG( imageWidth == bmpWidth && imageHeight == bmpHeight,
 300                               "all column bitmaps must have the same size" );
 301             }
 302
 303             m_imageList->Add(bmp);
 304             hdi.iImage = m_imageList->GetImageCount() - 1;
 305         }
 306         else // no bitmap but we still need to update the item
 307         {
 308             hdi.iImage = I_IMAGENONE;
 309         }
 310     }
 311
 312     if ( col.GetAlignment() != wxALIGN_NOT )
 313     {
 314         hdi.mask |= HDI_FORMAT | HDF_LEFT;
 315         switch ( col.GetAlignment() )
 316         {
 317             case wxALIGN_LEFT:
 318                 hdi.fmt |= HDF_LEFT;
 319                 break;
 320
 321             case wxALIGN_CENTER:
 322             case wxALIGN_CENTER_HORIZONTAL:
 323                 hdi.fmt |= HDF_CENTER;
 324                 break;
 325
 326             case wxALIGN_RIGHT:
 327                 hdi.fmt |= HDF_RIGHT;
 328                 break;
 329
 330             default:
 331                 wxFAIL_MSG( "invalid column header alignment" );
 332         }
 333     }
 334
 335     if ( col.IsSortKey() )
 336     {
 337         hdi.mask |= HDI_FORMAT;
 338         hdi.fmt |= col.IsSortOrderAscending() ? HDF_SORTUP : HDF_SORTDOWN;
 339     }
 340
 341     if ( col.GetWidth() != wxCOL_WIDTH_DEFAULT )
 342     {
 343         hdi.mask |= HDI_WIDTH;
 344         hdi.cxy = col.GetWidth();
 345     }
 346
 347     hdi.mask |= HDI_ORDER;
 348     hdi.iOrder = MSWToNativeOrder(m_colIndices.Index(idx));
 349
 350     if ( ::SendMessage(GetHwnd(), HDM_INSERTITEM,
 351                        MSWToNativeIdx(idx), (LPARAM)&hdi) == -1 )
 352     {
 353         wxLogLastError(wxT("Header_InsertItem()"));
 354     }
 355 }
 356
 357 void wxHeaderCtrl::DoSetColumnsOrder(const wxArrayInt& order)
 358 {
 359     wxArrayInt orderShown;
 360     orderShown.reserve(m_numColumns);
 361
 362     for ( unsigned n = 0; n < m_numColumns; n++ )
 363     {
 364         const int idx = order[n];
 365         if ( GetColumn(idx).IsShown() )
 366             orderShown.push_back(MSWToNativeIdx(idx));
 367     }
 368
 369     if ( !Header_SetOrderArray(GetHwnd(), orderShown.size(), &orderShown[0]) )
 370     {
 371         wxLogLastError(wxT("Header_GetOrderArray"));
 372     }
 373
 374     m_colIndices = order;
 375 }
 376
 377 wxArrayInt wxHeaderCtrl::DoGetColumnsOrder() const
 378 {
 379     // we don't use Header_GetOrderArray() here because it doesn't return
 380     // information about the hidden columns, instead we just save the columns
 381     // order array in DoSetColumnsOrder() and update it when they're reordered
 382     return m_colIndices;
 383 }
 384
 385 // ----------------------------------------------------------------------------
 386 // wxHeaderCtrl indexes and positions translation
 387 // ----------------------------------------------------------------------------
 388
 389 int wxHeaderCtrl::MSWToNativeIdx(int idx)
 390 {
 391     // don't check for GetColumn(idx).IsShown() as it could have just became
 392     // false and we may be called from DoUpdate() to delete the old column
 393     wxASSERT_MSG( !m_isHidden[idx],
 394                   "column must be visible to have an "
 395                   "index in the native control" );
 396
 397     int item = idx;
 398     for ( int i = 0; i < idx; i++ )
 399     {
 400         if ( GetColumn(i).IsHidden() )
 401             item--; // one less column the native control knows about
 402     }
 403
 404     wxASSERT_MSG( item >= 0 && item <= GetShownColumnsCount(), "logic error" );
 405
 406     return item;
 407 }
 408
 409 int wxHeaderCtrl::MSWFromNativeIdx(int item)
 410 {
 411     wxASSERT_MSG( item >= 0 && item < GetShownColumnsCount(),
 412                   "column index out of range" );
 413
 414     // reverse the above function
 415
 416     unsigned idx = item;
 417     for ( unsigned n = 0; n < m_numColumns; n++ )
 418     {
 419         if ( n > idx )
 420             break;
 421
 422         if ( GetColumn(n).IsHidden() )
 423             idx++;
 424     }
 425
 426     wxASSERT_MSG( MSWToNativeIdx(idx) == item, "logic error" );
 427
 428     return idx;
 429 }
 430
 431 int wxHeaderCtrl::MSWToNativeOrder(int pos)
 432 {
 433     wxASSERT_MSG( pos >= 0 && static_cast<unsigned>(pos) < m_numColumns,
 434                   "column position out of range" );
 435
 436     int order = pos;
 437     for ( int n = 0; n < pos; n++ )
 438     {
 439         if ( GetColumn(m_colIndices[n]).IsHidden() )
 440             order--;
 441     }
 442
 443     wxASSERT_MSG( order >= 0 && order <= GetShownColumnsCount(), "logic error" );
 444
 445     return order;
 446 }
 447
 448 int wxHeaderCtrl::MSWFromNativeOrder(int order)
 449 {
 450     wxASSERT_MSG( order >= 0 && order < GetShownColumnsCount(),
 451                   "native column position out of range" );
 452
 453     unsigned pos = order;
 454     for ( unsigned n = 0; n < m_numColumns; n++ )
 455     {
 456         if ( n > pos )
 457             break;
 458
 459         if ( GetColumn(m_colIndices[n]).IsHidden() )
 460             pos++;
 461     }
 462
 463     wxASSERT_MSG( MSWToNativeOrder(pos) == order, "logic error" );
 464
 465     return pos;
 466 }
 467
 468 // ----------------------------------------------------------------------------
 469 // wxHeaderCtrl events
 470 // ----------------------------------------------------------------------------
 471
 472 wxEventType wxHeaderCtrl::GetClickEventType(bool dblclk, int button)
 473 {
 474     wxEventType evtType;
 475     switch ( button )
 476     {
 477         case 0:
 478             evtType = dblclk ? wxEVT_COMMAND_HEADER_DCLICK
 479                              : wxEVT_COMMAND_HEADER_CLICK;
 480             break;
 481
 482         case 1:
 483             evtType = dblclk ? wxEVT_COMMAND_HEADER_RIGHT_DCLICK
 484                              : wxEVT_COMMAND_HEADER_RIGHT_CLICK;
 485             break;
 486
 487         case 2:
 488             evtType = dblclk ? wxEVT_COMMAND_HEADER_MIDDLE_DCLICK
 489                              : wxEVT_COMMAND_HEADER_MIDDLE_CLICK;
 490             break;
 491
 492         default:
 493             wxFAIL_MSG( wxS("unexpected event type") );
 494             evtType = wxEVT_NULL;
 495     }
 496
 497     return evtType;
 498 }
 499
 500 bool wxHeaderCtrl::MSWOnNotify(int idCtrl, WXLPARAM lParam, WXLPARAM *result)
 501 {
 502     NMHEADER * const nmhdr = (NMHEADER *)lParam;
 503
 504     wxEventType evtType = wxEVT_NULL;
 505     int width = 0;
 506     int order = -1;
 507     bool veto = false;
 508     const UINT code = nmhdr->hdr.code;
 509
 510     // we don't have the index for all events, e.g. not for NM_RELEASEDCAPTURE
 511     // so only access for header control events (and yes, the direction of
 512     // comparisons with FIRST/LAST is correct even if it seems inverted)
 513     int idx = code <= HDN_FIRST && code > HDN_LAST ? nmhdr->iItem : -1;
 514     if ( idx != -1 )
 515     {
 516         // we also get bogus HDN_BEGINDRAG with -1 index so don't call
 517         // MSWFromNativeIdx() unconditionally for nmhdr->iItem
 518         idx = MSWFromNativeIdx(idx);
 519     }
 520
 521     switch ( code )
 522     {
 523         // click events
 524         // ------------
 525
 526         case HDN_ITEMCLICK:
 527         case HDN_ITEMDBLCLICK:
 528             evtType = GetClickEventType(code == HDN_ITEMDBLCLICK, nmhdr->iButton);
 529
 530             // We're not dragging any more.
 531             m_colBeingDragged = -1;
 532             break;
 533
 534             // although we should get the notifications about the right clicks
 535             // via HDN_ITEM[DBL]CLICK too according to MSDN this simply doesn't
 536             // happen in practice on any Windows system up to 2003
 537         case NM_RCLICK:
 538         case NM_RDBLCLK:
 539             {
 540                 POINT pt;
 541                 idx = wxMSWGetColumnClicked(&nmhdr->hdr, &pt);
 542                 if ( idx != wxNOT_FOUND )
 543                 {
 544                     idx = MSWFromNativeIdx(idx);
 545
 546                     // due to a bug in mingw32 headers NM_RDBLCLK is signed
 547                     // there so we need a cast to avoid warnings about signed/
 548                     // unsigned comparison
 549                     evtType = GetClickEventType(
 550                                 code == static_cast<UINT>(NM_RDBLCLK), 1);
 551                 }
 552                 //else: ignore clicks outside any column
 553             }
 554             break;
 555
 556         case HDN_DIVIDERDBLCLICK:
 557             evtType = wxEVT_COMMAND_HEADER_SEPARATOR_DCLICK;
 558             break;
 559
 560
 561         // column resizing events
 562         // ----------------------
 563
 564         // see comments in wxListCtrl::MSWOnNotify() for why we catch both
 565         // ASCII and Unicode versions of this message
 566         case HDN_BEGINTRACKA:
 567         case HDN_BEGINTRACKW:
 568             // non-resizable columns can't be resized no matter what, don't
 569             // even generate any events for them
 570             if ( !GetColumn(idx).IsResizeable() )
 571             {
 572                 veto = true;
 573                 break;
 574             }
 575
 576             evtType = wxEVT_COMMAND_HEADER_BEGIN_RESIZE;
 577             // fall through
 578
 579         case HDN_ENDTRACKA:
 580         case HDN_ENDTRACKW:
 581             width = nmhdr->pitem->cxy;
 582
 583             if ( evtType == wxEVT_NULL )
 584             {
 585                 evtType = wxEVT_COMMAND_HEADER_END_RESIZE;
 586
 587                 // don't generate events with invalid width
 588                 const int minWidth = GetColumn(idx).GetMinWidth();
 589                 if ( width < minWidth )
 590                     width = minWidth;
 591             }
 592             break;
 593
 594             // The control is not supposed to send HDN_TRACK when using
 595             // HDS_FULLDRAG (which we do use) but apparently some versions of
 596             // comctl32.dll still do it, see #13506, so catch both messages
 597             // just in case we are dealing with one of these buggy versions.
 598         case HDN_TRACK:
 599         case HDN_ITEMCHANGING:
 600             if ( nmhdr->pitem && (nmhdr->pitem->mask & HDI_WIDTH) )
 601             {
 602                 // prevent the column from being shrunk beneath its min width
 603                 width = nmhdr->pitem->cxy;
 604                 if ( width < GetColumn(idx).GetMinWidth() )
 605                 {
 606                     // don't generate any events and prevent the change from
 607                     // happening
 608                     veto = true;
 609                 }
 610                 else // width is acceptable
 611                 {
 612                     // generate the resizing event from here as we don't seem
 613                     // to be getting HDN_TRACK events at all, at least with
 614                     // comctl32.dll v6
 615                     evtType = wxEVT_COMMAND_HEADER_RESIZING;
 616                 }
 617             }
 618             break;
 619
 620
 621         // column reordering events
 622         // ------------------------
 623
 624         case HDN_BEGINDRAG:
 625             // Windows sometimes sends us events with invalid column indices
 626             if ( nmhdr->iItem == -1 )
 627                 break;
 628
 629             // If we are dragging a column that is not draggable and the mouse
 630             // is moved over a different column then we get the column number from
 631             // the column under the mouse. This results in an unexpected behaviour
 632             // if this column is draggable. To prevent this remember the column we
 633             // are dragging for the complete drag and drop cycle.
 634             if ( m_colBeingDragged == -1 )
 635             {
 636                 m_colBeingDragged = idx;
 637             }
 638
 639             // column must have the appropriate flag to be draggable
 640             if ( !GetColumn(m_colBeingDragged).IsReorderable() )
 641             {
 642                 veto = true;
 643                 break;
 644             }
 645
 646             evtType = wxEVT_COMMAND_HEADER_BEGIN_REORDER;
 647             break;
 648
 649         case HDN_ENDDRAG:
 650             wxASSERT_MSG( nmhdr->pitem->mask & HDI_ORDER, "should have order" );
 651             order = nmhdr->pitem->iOrder;
 652
 653             // we also get messages with invalid order when column reordering
 654             // is cancelled (e.g. by pressing Esc)
 655             if ( order == -1 )
 656                 break;
 657
 658             order = MSWFromNativeOrder(order);
 659
 660             evtType = wxEVT_COMMAND_HEADER_END_REORDER;
 661
 662             // We (successfully) ended dragging the column.
 663             m_colBeingDragged = -1;
 664             break;
 665
 666         case NM_RELEASEDCAPTURE:
 667             evtType = wxEVT_COMMAND_HEADER_DRAGGING_CANCELLED;
 668
 669             // Dragging the column was cancelled.
 670             m_colBeingDragged = -1;
 671             break;
 672     }
 673
 674
 675     // do generate the corresponding wx event
 676     if ( evtType != wxEVT_NULL )
 677     {
 678         wxHeaderCtrlEvent event(evtType, GetId());
 679         event.SetEventObject(this);
 680         event.SetColumn(idx);
 681         event.SetWidth(width);
 682         if ( order != -1 )
 683             event.SetNewOrder(order);
 684
 685         const bool processed = GetEventHandler()->ProcessEvent(event);
 686
 687         if ( processed && !event.IsAllowed() )
 688             veto = true;
 689
 690         if ( !veto )
 691         {
 692             // special post-processing for HDN_ENDDRAG: we need to update the
 693             // internal column indices array if this is allowed to go ahead as
 694             // the native control is going to reorder its columns now
 695             if ( evtType == wxEVT_COMMAND_HEADER_END_REORDER )
 696                 MoveColumnInOrderArray(m_colIndices, idx, order);
 697
 698             if ( processed )
 699             {
 700                 // skip default processing below
 701                 return true;
 702             }
 703         }
 704     }
 705
 706     if ( veto )
 707     {
 708         // all of HDN_BEGIN{DRAG,TRACK}, HDN_TRACK and HDN_ITEMCHANGING
 709         // interpret TRUE return value as meaning to stop the control
 710         // default handling of the message
 711         *result = TRUE;
 712
 713         return true;
 714     }
 715
 716     return wxHeaderCtrlBase::MSWOnNotify(idCtrl, lParam, result);
 717 }
 718
 719 #endif // wxHAS_GENERIC_HEADERCTRL
 720
 721 #endif // wxUSE_HEADERCTRL