src/msw/treectrl.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        treectrl.cpp
   3 // Purpose:     wxTreeCtrl
   4 // Author:      Julian Smart
   5 // Modified by: Vadim Zeitlin to be less MSW-specific on 10.10.98
   6 // Created:     1997
   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 #ifdef __GNUG__
  20     #pragma implementation "treectrl.h"
  21 #endif
  22
  23 // For compilers that support precompilation, includes "wx.h".
  24 #include "wx/wxprec.h"
  25
  26 #ifdef __BORLANDC__
  27     #pragma hdrstop
  28 #endif
  29
  30 #include "wx/window.h"
  31 #include "wx/msw/private.h"
  32
  33 // Mingw32 is a bit mental even though this is done in winundef
  34 #ifdef GetFirstChild
  35     #undef GetFirstChild
  36 #endif
  37
  38 #ifdef GetNextSibling
  39     #undef GetNextSibling
  40 #endif
  41
  42 #if defined(__WIN95__)
  43
  44 #include "wx/log.h"
  45 #include "wx/dynarray.h"
  46 #include "wx/imaglist.h"
  47 #include "wx/treectrl.h"
  48
  49 #ifdef __GNUWIN32__
  50 #ifndef wxUSE_NORLANDER_HEADERS
  51 #include "wx/msw/gnuwin32/extra.h"
  52 #endif
  53 #endif
  54
  55 #if (defined(__WIN95__) && !defined(__GNUWIN32__)) || defined(__TWIN32__) || defined(wxUSE_NORLANDER_HEADERS)
  56     #include <commctrl.h>
  57 #endif
  58
  59 // Bug in headers, sometimes
  60 #ifndef TVIS_FOCUSED
  61     #define TVIS_FOCUSED            0x0001
  62 #endif
  63
  64 // ----------------------------------------------------------------------------
  65 // private classes
  66 // ----------------------------------------------------------------------------
  67
  68 // a convenient wrapper around TV_ITEM struct which adds a ctor
  69 struct wxTreeViewItem : public TV_ITEM
  70 {
  71     wxTreeViewItem(const wxTreeItemId& item,    // the item handle
  72                    UINT mask_,                  // fields which are valid
  73                    UINT stateMask_ = 0)         // for TVIF_STATE only
  74     {
  75         // hItem member is always valid
  76         mask = mask_ | TVIF_HANDLE;
  77         stateMask = stateMask_;
  78         hItem = (HTREEITEM) (WXHTREEITEM) item;
  79     }
  80 };
  81
  82 // a class which encapsulates the tree traversal logic: it vists all (unless
  83 // OnVisit() returns FALSE) items under the given one
  84 class wxTreeTraversal
  85 {
  86 public:
  87     wxTreeTraversal(const wxTreeCtrl *tree)
  88     {
  89         m_tree = tree;
  90     }
  91
  92     // do traverse the tree: visit all items (recursively by default) under the
  93     // given one; return TRUE if all items were traversed or FALSE if the
  94     // traversal was aborted because OnVisit returned FALSE
  95     bool DoTraverse(const wxTreeItemId& root, bool recursively = TRUE);
  96
  97     // override this function to do whatever is needed for each item, return
  98     // FALSE to stop traversing
  99     virtual bool OnVisit(const wxTreeItemId& item) = 0;
 100
 101 protected:
 102     const wxTreeCtrl *GetTree() const { return m_tree; }
 103
 104 private:
 105     bool Traverse(const wxTreeItemId& root, bool recursively);
 106
 107     const wxTreeCtrl *m_tree;
 108 };
 109
 110 // ----------------------------------------------------------------------------
 111 // macros
 112 // ----------------------------------------------------------------------------
 113
 114 #if !USE_SHARED_LIBRARY
 115     IMPLEMENT_DYNAMIC_CLASS(wxTreeCtrl, wxControl)
 116 #endif
 117
 118 // ----------------------------------------------------------------------------
 119 // variables
 120 // ----------------------------------------------------------------------------
 121
 122 // handy table for sending events
 123 static const wxEventType g_events[2][2] =
 124 {
 125     { wxEVT_COMMAND_TREE_ITEM_COLLAPSED, wxEVT_COMMAND_TREE_ITEM_COLLAPSING },
 126     { wxEVT_COMMAND_TREE_ITEM_EXPANDED,  wxEVT_COMMAND_TREE_ITEM_EXPANDING  }
 127 };
 128
 129 // ============================================================================
 130 // implementation
 131 // ============================================================================
 132
 133 // ----------------------------------------------------------------------------
 134 // tree traversal
 135 // ----------------------------------------------------------------------------
 136
 137 bool wxTreeTraversal::DoTraverse(const wxTreeItemId& root, bool recursively)
 138 {
 139     if ( !OnVisit(root) )
 140         return FALSE;
 141
 142     return Traverse(root, recursively);
 143 }
 144
 145 bool wxTreeTraversal::Traverse(const wxTreeItemId& root, bool recursively)
 146 {
 147     long cookie;
 148     wxTreeItemId child = m_tree->GetFirstChild(root, cookie);
 149     while ( child.IsOk() )
 150     {
 151         // depth first traversal
 152         if ( recursively && !Traverse(child, TRUE) )
 153             return FALSE;
 154
 155         if ( !OnVisit(child) )
 156             return FALSE;
 157
 158         child = m_tree->GetNextChild(root, cookie);
 159     }
 160
 161     return TRUE;
 162 }
 163
 164 // ----------------------------------------------------------------------------
 165 // construction and destruction
 166 // ----------------------------------------------------------------------------
 167
 168 void wxTreeCtrl::Init()
 169 {
 170     m_imageListNormal = NULL;
 171     m_imageListState = NULL;
 172     m_textCtrl = NULL;
 173 }
 174
 175 bool wxTreeCtrl::Create(wxWindow *parent,
 176                         wxWindowID id,
 177                         const wxPoint& pos,
 178                         const wxSize& size,
 179                         long style,
 180                         const wxValidator& validator,
 181                         const wxString& name)
 182 {
 183     Init();
 184
 185     if ( !CreateControl(parent, id, pos, size, style, validator, name) )
 186         return FALSE;
 187
 188     DWORD wstyle = WS_VISIBLE | WS_CHILD | WS_TABSTOP |
 189                    TVS_HASLINES | TVS_SHOWSELALWAYS;
 190
 191     if ( m_windowStyle & wxTR_HAS_BUTTONS )
 192         wstyle |= TVS_HASBUTTONS;
 193
 194     if ( m_windowStyle & wxTR_EDIT_LABELS )
 195         wstyle |= TVS_EDITLABELS;
 196
 197     if ( m_windowStyle & wxTR_LINES_AT_ROOT )
 198         wstyle |= TVS_LINESATROOT;
 199
 200 #if !defined( __GNUWIN32__ ) && !defined( __BORLANDC__ ) && !defined(wxUSE_NORLANDER_HEADERS)
 201     // we emulate the multiple selection tree controls by using checkboxes: set
 202     // up the image list we need for this if we do have multiple selections
 203     if ( m_windowStyle & wxTR_MULTIPLE )
 204         wstyle |= TVS_CHECKBOXES;
 205 #endif
 206
 207     // Create the tree control.
 208     if ( !MSWCreateControl(WC_TREEVIEW, wstyle) )
 209         return FALSE;
 210
 211     // the treectrl with any other background looks ugly because the items
 212     // background is white anyhow
 213     SetBackgroundColour(*wxWHITE);
 214
 215     // VZ: this is some experimental code which may be used to get the
 216     //     TVS_CHECKBOXES style functionality for comctl32.dll < 4.71.
 217     //     AFAIK, the standard DLL does about the same thing anyhow.
 218 #if 0
 219     if ( m_windowStyle & wxTR_MULTIPLE )
 220     {
 221         wxBitmap bmp;
 222
 223         // create the DC compatible with the current screen
 224         HDC hdcMem = CreateCompatibleDC(NULL);
 225
 226         // create a mono bitmap of the standard size
 227         int x = GetSystemMetrics(SM_CXMENUCHECK);
 228         int y = GetSystemMetrics(SM_CYMENUCHECK);
 229         wxImageList imagelistCheckboxes(x, y, FALSE, 2);
 230         HBITMAP hbmpCheck = CreateBitmap(x, y,   // bitmap size
 231                                          1,      // # of color planes
 232                                          1,      // # bits needed for one pixel
 233                                          0);     // array containing colour data
 234         SelectObject(hdcMem, hbmpCheck);
 235
 236         // then draw a check mark into it
 237         RECT rect = { 0, 0, x, y };
 238         if ( !::DrawFrameControl(hdcMem, &rect,
 239                                  DFC_BUTTON,
 240                                  DFCS_BUTTONCHECK | DFCS_CHECKED) )
 241         {
 242             wxLogLastError(_T("DrawFrameControl(check)"));
 243         }
 244
 245         bmp.SetHBITMAP((WXHBITMAP)hbmpCheck);
 246         imagelistCheckboxes.Add(bmp);
 247
 248         if ( !::DrawFrameControl(hdcMem, &rect,
 249                                  DFC_BUTTON,
 250                                  DFCS_BUTTONCHECK) )
 251         {
 252             wxLogLastError(_T("DrawFrameControl(uncheck)"));
 253         }
 254
 255         bmp.SetHBITMAP((WXHBITMAP)hbmpCheck);
 256         imagelistCheckboxes.Add(bmp);
 257
 258         // clean up
 259         ::DeleteDC(hdcMem);
 260
 261         // set the imagelist
 262         SetStateImageList(&imagelistCheckboxes);
 263     }
 264 #endif // 0
 265
 266     SetSize(pos.x, pos.y, size.x, size.y);
 267
 268     return TRUE;
 269 }
 270
 271 wxTreeCtrl::~wxTreeCtrl()
 272 {
 273     DeleteTextCtrl();
 274
 275     // delete user data to prevent memory leaks
 276     DeleteAllItems();
 277 }
 278
 279 // ----------------------------------------------------------------------------
 280 // accessors
 281 // ----------------------------------------------------------------------------
 282
 283 // simple wrappers which add error checking in debug mode
 284
 285 bool wxTreeCtrl::DoGetItem(wxTreeViewItem* tvItem) const
 286 {
 287     if ( !TreeView_GetItem(GetHwnd(), tvItem) )
 288     {
 289         wxLogLastError("TreeView_GetItem");
 290
 291         return FALSE;
 292     }
 293
 294     return TRUE;
 295 }
 296
 297 void wxTreeCtrl::DoSetItem(wxTreeViewItem* tvItem)
 298 {
 299     if ( TreeView_SetItem(GetHwnd(), tvItem) == -1 )
 300     {
 301         wxLogLastError("TreeView_SetItem");
 302     }
 303 }
 304
 305 size_t wxTreeCtrl::GetCount() const
 306 {
 307     return (size_t)TreeView_GetCount(GetHwnd());
 308 }
 309
 310 unsigned int wxTreeCtrl::GetIndent() const
 311 {
 312     return TreeView_GetIndent(GetHwnd());
 313 }
 314
 315 void wxTreeCtrl::SetIndent(unsigned int indent)
 316 {
 317     TreeView_SetIndent(GetHwnd(), indent);
 318 }
 319
 320 wxImageList *wxTreeCtrl::GetImageList() const
 321 {
 322     return m_imageListNormal;
 323 }
 324
 325 wxImageList *wxTreeCtrl::GetStateImageList() const
 326 {
 327     return m_imageListNormal;
 328 }
 329
 330 void wxTreeCtrl::SetAnyImageList(wxImageList *imageList, int which)
 331 {
 332     // no error return
 333     TreeView_SetImageList(GetHwnd(),
 334                           imageList ? imageList->GetHIMAGELIST() : 0,
 335                           which);
 336 }
 337
 338 void wxTreeCtrl::SetImageList(wxImageList *imageList)
 339 {
 340     SetAnyImageList(m_imageListNormal = imageList, TVSIL_NORMAL);
 341 }
 342
 343 void wxTreeCtrl::SetStateImageList(wxImageList *imageList)
 344 {
 345     SetAnyImageList(m_imageListState = imageList, TVSIL_STATE);
 346 }
 347
 348 // internal class for counting tree items
 349
 350 class TraverseCounter : public wxTreeTraversal
 351 {
 352 public:
 353         TraverseCounter(const wxTreeCtrl *tree,
 354                         const wxTreeItemId& root,
 355                         bool recursively)
 356             : wxTreeTraversal(tree)
 357             {
 358                 m_count = 0;
 359
 360                 DoTraverse(root, recursively);
 361             }
 362
 363         virtual bool OnVisit(const wxTreeItemId& item)
 364         {
 365             m_count++;
 366
 367             return TRUE;
 368         }
 369
 370         size_t GetCount() const { return m_count; }
 371
 372 private:
 373         size_t m_count;
 374 };
 375
 376
 377 size_t wxTreeCtrl::GetChildrenCount(const wxTreeItemId& item,
 378                                     bool recursively) const
 379 {
 380     TraverseCounter counter(this, item, recursively);
 381
 382     return counter.GetCount();
 383 }
 384
 385 // ----------------------------------------------------------------------------
 386 // Item access
 387 // ----------------------------------------------------------------------------
 388
 389 wxString wxTreeCtrl::GetItemText(const wxTreeItemId& item) const
 390 {
 391     wxChar buf[512];  // the size is arbitrary...
 392
 393     wxTreeViewItem tvItem(item, TVIF_TEXT);
 394     tvItem.pszText = buf;
 395     tvItem.cchTextMax = WXSIZEOF(buf);
 396     if ( !DoGetItem(&tvItem) )
 397     {
 398         // don't return some garbage which was on stack, but an empty string
 399         buf[0] = _T('\0');
 400     }
 401
 402     return wxString(buf);
 403 }
 404
 405 void wxTreeCtrl::SetItemText(const wxTreeItemId& item, const wxString& text)
 406 {
 407     wxTreeViewItem tvItem(item, TVIF_TEXT);
 408     tvItem.pszText = (wxChar *)text.c_str();  // conversion is ok
 409     DoSetItem(&tvItem);
 410 }
 411
 412 void wxTreeCtrl::DoSetItemImages(const wxTreeItemId& item,
 413                                  int image,
 414                                  int imageSel)
 415 {
 416     wxTreeViewItem tvItem(item, TVIF_IMAGE | TVIF_SELECTEDIMAGE);
 417     tvItem.iSelectedImage = imageSel;
 418     tvItem.iImage = image;
 419     DoSetItem(&tvItem);
 420 }
 421
 422 int wxTreeCtrl::GetItemImage(const wxTreeItemId& item) const
 423 {
 424     wxTreeViewItem tvItem(item, TVIF_IMAGE);
 425     DoGetItem(&tvItem);
 426
 427     return tvItem.iImage;
 428 }
 429
 430 void wxTreeCtrl::SetItemImage(const wxTreeItemId& item, int image)
 431 {
 432     // NB: at least in version 5.00.0518.9 of comctl32.dll we need to always
 433     //     change both normal and selected image - otherwise the change simply
 434     //     doesn't take place!
 435     DoSetItemImages(item, image, GetItemSelectedImage(item));
 436 }
 437
 438 int wxTreeCtrl::GetItemSelectedImage(const wxTreeItemId& item) const
 439 {
 440     wxTreeViewItem tvItem(item, TVIF_SELECTEDIMAGE);
 441     DoGetItem(&tvItem);
 442
 443     return tvItem.iSelectedImage;
 444 }
 445
 446 void wxTreeCtrl::SetItemSelectedImage(const wxTreeItemId& item, int image)
 447 {
 448     // NB: at least in version 5.00.0518.9 of comctl32.dll we need to always
 449     //     change both normal and selected image - otherwise the change simply
 450     //     doesn't take place!
 451     DoSetItemImages(item, GetItemImage(item), image);
 452 }
 453
 454 wxTreeItemData *wxTreeCtrl::GetItemData(const wxTreeItemId& item) const
 455 {
 456     wxTreeViewItem tvItem(item, TVIF_PARAM);
 457     if ( !DoGetItem(&tvItem) )
 458     {
 459         return NULL;
 460     }
 461
 462     return (wxTreeItemData *)tvItem.lParam;
 463 }
 464
 465 void wxTreeCtrl::SetItemData(const wxTreeItemId& item, wxTreeItemData *data)
 466 {
 467     wxTreeViewItem tvItem(item, TVIF_PARAM);
 468     tvItem.lParam = (LPARAM)data;
 469     DoSetItem(&tvItem);
 470 }
 471
 472 void wxTreeCtrl::SetItemHasChildren(const wxTreeItemId& item, bool has)
 473 {
 474     wxTreeViewItem tvItem(item, TVIF_CHILDREN);
 475     tvItem.cChildren = (int)has;
 476     DoSetItem(&tvItem);
 477 }
 478
 479 void wxTreeCtrl::SetItemBold(const wxTreeItemId& item, bool bold)
 480 {
 481     wxTreeViewItem tvItem(item, TVIF_STATE, TVIS_BOLD);
 482     tvItem.state = bold ? TVIS_BOLD : 0;
 483     DoSetItem(&tvItem);
 484 }
 485
 486 void wxTreeCtrl::SetItemDropHighlight(const wxTreeItemId& item, bool highlight)
 487 {
 488     wxTreeViewItem tvItem(item, TVIF_STATE, TVIS_DROPHILITED);
 489     tvItem.state = highlight ? TVIS_DROPHILITED : 0;
 490     DoSetItem(&tvItem);
 491 }
 492
 493 // ----------------------------------------------------------------------------
 494 // Item status
 495 // ----------------------------------------------------------------------------
 496
 497 bool wxTreeCtrl::IsVisible(const wxTreeItemId& item) const
 498 {
 499     // Bug in Gnu-Win32 headers, so don't use the macro TreeView_GetItemRect
 500     RECT rect;
 501     return SendMessage(GetHwnd(), TVM_GETITEMRECT, FALSE, (LPARAM)&rect) != 0;
 502
 503 }
 504
 505 bool wxTreeCtrl::ItemHasChildren(const wxTreeItemId& item) const
 506 {
 507     wxTreeViewItem tvItem(item, TVIF_CHILDREN);
 508     DoGetItem(&tvItem);
 509
 510     return tvItem.cChildren != 0;
 511 }
 512
 513 bool wxTreeCtrl::IsExpanded(const wxTreeItemId& item) const
 514 {
 515     // probably not a good idea to put it here
 516     //wxASSERT( ItemHasChildren(item) );
 517
 518     wxTreeViewItem tvItem(item, TVIF_STATE, TVIS_EXPANDED);
 519     DoGetItem(&tvItem);
 520
 521     return (tvItem.state & TVIS_EXPANDED) != 0;
 522 }
 523
 524 bool wxTreeCtrl::IsSelected(const wxTreeItemId& item) const
 525 {
 526     wxTreeViewItem tvItem(item, TVIF_STATE, TVIS_SELECTED);
 527     DoGetItem(&tvItem);
 528
 529     return (tvItem.state & TVIS_SELECTED) != 0;
 530 }
 531
 532 bool wxTreeCtrl::IsBold(const wxTreeItemId& item) const
 533 {
 534     wxTreeViewItem tvItem(item, TVIF_STATE, TVIS_BOLD);
 535     DoGetItem(&tvItem);
 536
 537     return (tvItem.state & TVIS_BOLD) != 0;
 538 }
 539
 540 // ----------------------------------------------------------------------------
 541 // navigation
 542 // ----------------------------------------------------------------------------
 543
 544 wxTreeItemId wxTreeCtrl::GetRootItem() const
 545 {
 546     return wxTreeItemId((WXHTREEITEM) TreeView_GetRoot(GetHwnd()));
 547 }
 548
 549 wxTreeItemId wxTreeCtrl::GetSelection() const
 550 {
 551     wxCHECK_MSG( !(m_windowStyle & wxTR_MULTIPLE), (WXHTREEITEM)0,
 552                  _T("this only works with single selection controls") );
 553
 554     return wxTreeItemId((WXHTREEITEM) TreeView_GetSelection(GetHwnd()));
 555 }
 556
 557 wxTreeItemId wxTreeCtrl::GetParent(const wxTreeItemId& item) const
 558 {
 559     return wxTreeItemId((WXHTREEITEM) TreeView_GetParent(GetHwnd(), (HTREEITEM) (WXHTREEITEM) item));
 560 }
 561
 562 wxTreeItemId wxTreeCtrl::GetFirstChild(const wxTreeItemId& item,
 563                                        long& _cookie) const
 564 {
 565     // remember the last child returned in 'cookie'
 566     _cookie = (long)TreeView_GetChild(GetHwnd(), (HTREEITEM) (WXHTREEITEM)item);
 567
 568     return wxTreeItemId((WXHTREEITEM)_cookie);
 569 }
 570
 571 wxTreeItemId wxTreeCtrl::GetNextChild(const wxTreeItemId& WXUNUSED(item),
 572                                       long& _cookie) const
 573 {
 574     wxTreeItemId l = wxTreeItemId((WXHTREEITEM)TreeView_GetNextSibling(GetHwnd(),
 575                                    (HTREEITEM)(WXHTREEITEM)_cookie));
 576     _cookie = (long)l;
 577
 578     return l;
 579 }
 580
 581 wxTreeItemId wxTreeCtrl::GetLastChild(const wxTreeItemId& item) const
 582 {
 583     // can this be done more efficiently?
 584     long cookie;
 585
 586     wxTreeItemId childLast,
 587     child = GetFirstChild(item, cookie);
 588     while ( child.IsOk() )
 589     {
 590         childLast = child;
 591         child = GetNextChild(item, cookie);
 592     }
 593
 594     return childLast;
 595 }
 596
 597 wxTreeItemId wxTreeCtrl::GetNextSibling(const wxTreeItemId& item) const
 598 {
 599     return wxTreeItemId((WXHTREEITEM) TreeView_GetNextSibling(GetHwnd(), (HTREEITEM) (WXHTREEITEM) item));
 600 }
 601
 602 wxTreeItemId wxTreeCtrl::GetPrevSibling(const wxTreeItemId& item) const
 603 {
 604     return wxTreeItemId((WXHTREEITEM) TreeView_GetPrevSibling(GetHwnd(), (HTREEITEM) (WXHTREEITEM) item));
 605 }
 606
 607 wxTreeItemId wxTreeCtrl::GetFirstVisibleItem() const
 608 {
 609     return wxTreeItemId((WXHTREEITEM) TreeView_GetFirstVisible(GetHwnd()));
 610 }
 611
 612 wxTreeItemId wxTreeCtrl::GetNextVisible(const wxTreeItemId& item) const
 613 {
 614     wxASSERT_MSG( IsVisible(item), _T("The item you call GetNextVisible() "
 615                                       "for must be visible itself!"));
 616
 617     return wxTreeItemId((WXHTREEITEM) TreeView_GetNextVisible(GetHwnd(), (HTREEITEM) (WXHTREEITEM) item));
 618 }
 619
 620 wxTreeItemId wxTreeCtrl::GetPrevVisible(const wxTreeItemId& item) const
 621 {
 622     wxASSERT_MSG( IsVisible(item), _T("The item you call GetPrevVisible() "
 623                                       "for must be visible itself!"));
 624
 625     return wxTreeItemId((WXHTREEITEM) TreeView_GetPrevVisible(GetHwnd(), (HTREEITEM) (WXHTREEITEM) item));
 626 }
 627
 628 // ----------------------------------------------------------------------------
 629 // multiple selections emulation
 630 // ----------------------------------------------------------------------------
 631
 632 bool wxTreeCtrl::IsItemChecked(const wxTreeItemId& item) const
 633 {
 634     // receive the desired information.
 635     wxTreeViewItem tvItem(item, TVIF_STATE, TVIS_STATEIMAGEMASK);
 636     DoGetItem(&tvItem);
 637
 638     // state image indices are 1 based
 639     return ((tvItem.state >> 12) - 1) == 1;
 640 }
 641
 642 void wxTreeCtrl::SetItemCheck(const wxTreeItemId& item, bool check)
 643 {
 644     // receive the desired information.
 645     wxTreeViewItem tvItem(item, TVIF_STATE, TVIS_STATEIMAGEMASK);
 646
 647     // state images are one-based
 648     tvItem.state = (check ? 2 : 1) << 12;
 649
 650     DoSetItem(&tvItem);
 651 }
 652
 653 // internal class for getting the selected
 654
 655 class TraverseSelections : public wxTreeTraversal
 656 {
 657 public:
 658         TraverseSelections(const wxTreeCtrl *tree,
 659                            wxArrayTreeItemIds& selections)
 660             : wxTreeTraversal(tree), m_selections(selections)
 661             {
 662                 m_selections.Empty();
 663
 664                 DoTraverse(tree->GetRootItem());
 665             }
 666
 667         virtual bool OnVisit(const wxTreeItemId& item)
 668         {
 669             if ( GetTree()->IsItemChecked(item) )
 670             {
 671                 m_selections.Add(item);
 672             }
 673
 674             return TRUE;
 675         }
 676
 677 private:
 678         wxArrayTreeItemIds& m_selections;
 679 };
 680
 681 size_t wxTreeCtrl::GetSelections(wxArrayTreeItemIds& selections) const
 682 {
 683     TraverseSelections selector(this, selections);
 684
 685     return selections.GetCount();
 686 }
 687
 688 // ----------------------------------------------------------------------------
 689 // Usual operations
 690 // ----------------------------------------------------------------------------
 691
 692 wxTreeItemId wxTreeCtrl::DoInsertItem(const wxTreeItemId& parent,
 693                                       wxTreeItemId hInsertAfter,
 694                                       const wxString& text,
 695                                       int image, int selectedImage,
 696                                       wxTreeItemData *data)
 697 {
 698     TV_INSERTSTRUCT tvIns;
 699     tvIns.hParent = (HTREEITEM) (WXHTREEITEM)parent;
 700     tvIns.hInsertAfter = (HTREEITEM) (WXHTREEITEM) hInsertAfter;
 701
 702     // This is how we insert the item as the first child: supply a NULL hInsertAfter
 703     if (tvIns.hInsertAfter == (HTREEITEM) 0)
 704     {
 705         tvIns.hInsertAfter = TVI_FIRST;
 706     }
 707
 708     UINT mask = 0;
 709     if ( !text.IsEmpty() )
 710     {
 711         mask |= TVIF_TEXT;
 712         tvIns.item.pszText = (wxChar *)text.c_str();  // cast is ok
 713     }
 714
 715     if ( image != -1 )
 716     {
 717         mask |= TVIF_IMAGE;
 718         tvIns.item.iImage = image;
 719
 720         if ( selectedImage == -1 )
 721         {
 722             // take the same image for selected icon if not specified
 723             selectedImage = image;
 724         }
 725     }
 726
 727     if ( selectedImage != -1 )
 728     {
 729         mask |= TVIF_SELECTEDIMAGE;
 730         tvIns.item.iSelectedImage = selectedImage;
 731     }
 732
 733     if ( data != NULL )
 734     {
 735         mask |= TVIF_PARAM;
 736         tvIns.item.lParam = (LPARAM)data;
 737     }
 738
 739     tvIns.item.mask = mask;
 740
 741     HTREEITEM id = (HTREEITEM) TreeView_InsertItem(GetHwnd(), &tvIns);
 742     if ( id == 0 )
 743     {
 744         wxLogLastError("TreeView_InsertItem");
 745     }
 746
 747     if ( data != NULL )
 748     {
 749         // associate the application tree item with Win32 tree item handle
 750         data->SetId((WXHTREEITEM)id);
 751     }
 752
 753     return wxTreeItemId((WXHTREEITEM)id);
 754 }
 755
 756 // for compatibility only
 757 wxTreeItemId wxTreeCtrl::InsertItem(const wxTreeItemId& parent,
 758                                     const wxString& text,
 759                                     int image, int selImage,
 760                                     long insertAfter)
 761 {
 762     return DoInsertItem(parent, (WXHTREEITEM)insertAfter, text,
 763                         image, selImage, NULL);
 764 }
 765
 766 wxTreeItemId wxTreeCtrl::AddRoot(const wxString& text,
 767                                  int image, int selectedImage,
 768                                  wxTreeItemData *data)
 769 {
 770     return DoInsertItem(wxTreeItemId((WXHTREEITEM) 0), (WXHTREEITEM) 0,
 771                         text, image, selectedImage, data);
 772 }
 773
 774 wxTreeItemId wxTreeCtrl::PrependItem(const wxTreeItemId& parent,
 775                                      const wxString& text,
 776                                      int image, int selectedImage,
 777                                      wxTreeItemData *data)
 778 {
 779     return DoInsertItem(parent, (WXHTREEITEM) TVI_FIRST,
 780                         text, image, selectedImage, data);
 781 }
 782
 783 wxTreeItemId wxTreeCtrl::InsertItem(const wxTreeItemId& parent,
 784                                     const wxTreeItemId& idPrevious,
 785                                     const wxString& text,
 786                                     int image, int selectedImage,
 787                                     wxTreeItemData *data)
 788 {
 789     return DoInsertItem(parent, idPrevious, text, image, selectedImage, data);
 790 }
 791
 792 wxTreeItemId wxTreeCtrl::AppendItem(const wxTreeItemId& parent,
 793                                     const wxString& text,
 794                                     int image, int selectedImage,
 795                                     wxTreeItemData *data)
 796 {
 797     return DoInsertItem(parent, (WXHTREEITEM) TVI_LAST,
 798                         text, image, selectedImage, data);
 799 }
 800
 801 void wxTreeCtrl::Delete(const wxTreeItemId& item)
 802 {
 803     if ( !TreeView_DeleteItem(GetHwnd(), (HTREEITEM)(WXHTREEITEM)item) )
 804     {
 805         wxLogLastError("TreeView_DeleteItem");
 806     }
 807 }
 808
 809 // delete all children (but don't delete the item itself)
 810 void wxTreeCtrl::DeleteChildren(const wxTreeItemId& item)
 811 {
 812     long cookie;
 813
 814     wxArrayLong children;
 815     wxTreeItemId child = GetFirstChild(item, cookie);
 816     while ( child.IsOk() )
 817     {
 818         children.Add((long)(WXHTREEITEM)child);
 819
 820         child = GetNextChild(item, cookie);
 821     }
 822
 823     size_t nCount = children.Count();
 824     for ( size_t n = 0; n < nCount; n++ )
 825     {
 826         if ( !TreeView_DeleteItem(GetHwnd(), (HTREEITEM)children[n]) )
 827         {
 828             wxLogLastError("TreeView_DeleteItem");
 829         }
 830     }
 831 }
 832
 833 void wxTreeCtrl::DeleteAllItems()
 834 {
 835     if ( !TreeView_DeleteAllItems(GetHwnd()) )
 836     {
 837         wxLogLastError("TreeView_DeleteAllItems");
 838     }
 839 }
 840
 841 void wxTreeCtrl::DoExpand(const wxTreeItemId& item, int flag)
 842 {
 843     wxASSERT_MSG( flag == TVE_COLLAPSE ||
 844                   flag == (TVE_COLLAPSE | TVE_COLLAPSERESET) ||
 845                   flag == TVE_EXPAND   ||
 846                   flag == TVE_TOGGLE,
 847                   _T("Unknown flag in wxTreeCtrl::DoExpand") );
 848
 849     // TreeView_Expand doesn't send TVN_ITEMEXPAND(ING) messages, so we must
 850     // emulate them. This behaviour has changed slightly with comctl32.dll
 851     // v 4.70 - now it does send them but only the first time. To maintain
 852     // compatible behaviour and also in order to not have surprises with the
 853     // future versions, don't rely on this and still do everything ourselves.
 854     // To avoid that the messages be sent twice when the item is expanded for
 855     // the first time we must clear TVIS_EXPANDEDONCE style manually.
 856
 857     wxTreeViewItem tvItem(item, TVIF_STATE, TVIS_EXPANDEDONCE);
 858     tvItem.state = 0;
 859     DoSetItem(&tvItem);
 860
 861     if ( TreeView_Expand(GetHwnd(), (HTREEITEM) (WXHTREEITEM) item, flag) != 0 )
 862     {
 863         wxTreeEvent event(wxEVT_NULL, m_windowId);
 864         event.m_item = item;
 865
 866         bool isExpanded = IsExpanded(item);
 867
 868         event.SetEventObject(this);
 869
 870         // FIXME return value of {EXPAND|COLLAPS}ING event handler is discarded
 871         event.SetEventType(g_events[isExpanded][TRUE]);
 872         GetEventHandler()->ProcessEvent(event);
 873
 874         event.SetEventType(g_events[isExpanded][FALSE]);
 875         GetEventHandler()->ProcessEvent(event);
 876     }
 877     //else: change didn't took place, so do nothing at all
 878 }
 879
 880 void wxTreeCtrl::Expand(const wxTreeItemId& item)
 881 {
 882     DoExpand(item, TVE_EXPAND);
 883 }
 884
 885 void wxTreeCtrl::Collapse(const wxTreeItemId& item)
 886 {
 887     DoExpand(item, TVE_COLLAPSE);
 888 }
 889
 890 void wxTreeCtrl::CollapseAndReset(const wxTreeItemId& item)
 891 {
 892     DoExpand(item, TVE_COLLAPSE | TVE_COLLAPSERESET);
 893 }
 894
 895 void wxTreeCtrl::Toggle(const wxTreeItemId& item)
 896 {
 897     DoExpand(item, TVE_TOGGLE);
 898 }
 899
 900 void wxTreeCtrl::ExpandItem(const wxTreeItemId& item, int action)
 901 {
 902     DoExpand(item, action);
 903 }
 904
 905 void wxTreeCtrl::Unselect()
 906 {
 907     wxASSERT_MSG( !(m_windowStyle & wxTR_MULTIPLE), _T("doesn't make sense") );
 908
 909     // just remove the selection
 910     SelectItem(wxTreeItemId((WXHTREEITEM) 0));
 911 }
 912
 913 void wxTreeCtrl::UnselectAll()
 914 {
 915     if ( m_windowStyle & wxTR_MULTIPLE )
 916     {
 917         wxArrayTreeItemIds selections;
 918         size_t count = GetSelections(selections);
 919         for ( size_t n = 0; n < count; n++ )
 920         {
 921             SetItemCheck(selections[n], FALSE);
 922         }
 923     }
 924     else
 925     {
 926         // just remove the selection
 927         Unselect();
 928     }
 929 }
 930
 931 void wxTreeCtrl::SelectItem(const wxTreeItemId& item)
 932 {
 933     if ( m_windowStyle & wxTR_MULTIPLE )
 934     {
 935         // selecting the item means checking it
 936         SetItemCheck(item);
 937     }
 938     else
 939     {
 940         // inspite of the docs (MSDN Jan 99 edition), we don't seem to receive
 941         // the notification from the control (i.e. TVN_SELCHANG{ED|ING}), so
 942         // send them ourselves
 943
 944         wxTreeEvent event(wxEVT_NULL, m_windowId);
 945         event.m_item = item;
 946         event.SetEventObject(this);
 947
 948         event.SetEventType(wxEVT_COMMAND_TREE_SEL_CHANGING);
 949         if ( !GetEventHandler()->ProcessEvent(event) || event.IsAllowed() )
 950         {
 951             if ( !TreeView_SelectItem(GetHwnd(), (HTREEITEM) (WXHTREEITEM) item) )
 952             {
 953                 wxLogLastError("TreeView_SelectItem");
 954             }
 955             else
 956             {
 957                 event.SetEventType(wxEVT_COMMAND_TREE_SEL_CHANGED);
 958                 (void)GetEventHandler()->ProcessEvent(event);
 959             }
 960         }
 961         //else: program vetoed the change
 962     }
 963 }
 964
 965 void wxTreeCtrl::EnsureVisible(const wxTreeItemId& item)
 966 {
 967     // no error return
 968     TreeView_EnsureVisible(GetHwnd(), (HTREEITEM) (WXHTREEITEM) item);
 969 }
 970
 971 void wxTreeCtrl::ScrollTo(const wxTreeItemId& item)
 972 {
 973     if ( !TreeView_SelectSetFirstVisible(GetHwnd(), (HTREEITEM) (WXHTREEITEM) item) )
 974     {
 975         wxLogLastError("TreeView_SelectSetFirstVisible");
 976     }
 977 }
 978
 979 wxTextCtrl* wxTreeCtrl::GetEditControl() const
 980 {
 981     return m_textCtrl;
 982 }
 983
 984 void wxTreeCtrl::DeleteTextCtrl()
 985 {
 986     if ( m_textCtrl )
 987     {
 988         m_textCtrl->UnsubclassWin();
 989         m_textCtrl->SetHWND(0);
 990         delete m_textCtrl;
 991         m_textCtrl = NULL;
 992     }
 993 }
 994
 995 wxTextCtrl* wxTreeCtrl::EditLabel(const wxTreeItemId& item,
 996                                   wxClassInfo* textControlClass)
 997 {
 998     wxASSERT( textControlClass->IsKindOf(CLASSINFO(wxTextCtrl)) );
 999
1000     HWND hWnd = (HWND) TreeView_EditLabel(GetHwnd(), (HTREEITEM) (WXHTREEITEM) item);
1001
1002     // this is not an error - the TVN_BEGINLABELEDIT handler might have
1003     // returned FALSE
1004     if ( !hWnd )
1005     {
1006         return NULL;
1007     }
1008
1009     DeleteTextCtrl();
1010
1011     m_textCtrl = (wxTextCtrl *)textControlClass->CreateObject();
1012     m_textCtrl->SetHWND((WXHWND)hWnd);
1013     m_textCtrl->SubclassWin((WXHWND)hWnd);
1014
1015     return m_textCtrl;
1016 }
1017
1018 // End label editing, optionally cancelling the edit
1019 void wxTreeCtrl::EndEditLabel(const wxTreeItemId& item, bool discardChanges)
1020 {
1021     TreeView_EndEditLabelNow(GetHwnd(), discardChanges);
1022
1023     DeleteTextCtrl();
1024 }
1025
1026 wxTreeItemId wxTreeCtrl::HitTest(const wxPoint& point, int& flags)
1027 {
1028     TV_HITTESTINFO hitTestInfo;
1029     hitTestInfo.pt.x = (int)point.x;
1030     hitTestInfo.pt.y = (int)point.y;
1031
1032     TreeView_HitTest(GetHwnd(), &hitTestInfo);
1033
1034     flags = 0;
1035
1036     // avoid repetition
1037     #define TRANSLATE_FLAG(flag) if ( hitTestInfo.flags & TVHT_##flag ) \
1038                                     flags |= wxTREE_HITTEST_##flag
1039
1040     TRANSLATE_FLAG(ABOVE);
1041     TRANSLATE_FLAG(BELOW);
1042     TRANSLATE_FLAG(NOWHERE);
1043     TRANSLATE_FLAG(ONITEMBUTTON);
1044     TRANSLATE_FLAG(ONITEMICON);
1045     TRANSLATE_FLAG(ONITEMINDENT);
1046     TRANSLATE_FLAG(ONITEMLABEL);
1047     TRANSLATE_FLAG(ONITEMRIGHT);
1048     TRANSLATE_FLAG(ONITEMSTATEICON);
1049     TRANSLATE_FLAG(TOLEFT);
1050     TRANSLATE_FLAG(TORIGHT);
1051
1052     #undef TRANSLATE_FLAG
1053
1054     return wxTreeItemId((WXHTREEITEM) hitTestInfo.hItem);
1055 }
1056
1057 bool wxTreeCtrl::GetBoundingRect(const wxTreeItemId& item,
1058                                  wxRect& rect,
1059                                  bool textOnly) const
1060 {
1061     RECT rc;
1062     if ( TreeView_GetItemRect(GetHwnd(), (HTREEITEM)(WXHTREEITEM)item,
1063                               &rc, textOnly) )
1064     {
1065         rect = wxRect(wxPoint(rc.left, rc.top), wxPoint(rc.right, rc.bottom));
1066
1067         return TRUE;
1068     }
1069     else
1070     {
1071         // couldn't retrieve rect: for example, item isn't visible
1072         return FALSE;
1073     }
1074 }
1075
1076 // ----------------------------------------------------------------------------
1077 // sorting stuff
1078 // ----------------------------------------------------------------------------
1079
1080 static int CALLBACK TreeView_CompareCallback(wxTreeItemData *pItem1,
1081                                              wxTreeItemData *pItem2,
1082                                              wxTreeCtrl *tree)
1083 {
1084     wxCHECK_MSG( pItem1 && pItem2, 0,
1085                  _T("sorting tree without data doesn't make sense") );
1086
1087     return tree->OnCompareItems(pItem1->GetId(), pItem2->GetId());
1088 }
1089
1090 int wxTreeCtrl::OnCompareItems(const wxTreeItemId& item1,
1091                                const wxTreeItemId& item2)
1092 {
1093     return wxStrcmp(GetItemText(item1), GetItemText(item2));
1094 }
1095
1096 void wxTreeCtrl::SortChildren(const wxTreeItemId& item)
1097 {
1098     // rely on the fact that TreeView_SortChildren does the same thing as our
1099     // default behaviour, i.e. sorts items alphabetically and so call it
1100     // directly if we're not in derived class (much more efficient!)
1101     if ( GetClassInfo() == CLASSINFO(wxTreeCtrl) )
1102     {
1103         TreeView_SortChildren(GetHwnd(), (HTREEITEM)(WXHTREEITEM)item, 0);
1104     }
1105     else
1106     {
1107         TV_SORTCB tvSort;
1108         tvSort.hParent = (HTREEITEM)(WXHTREEITEM)item;
1109         tvSort.lpfnCompare = (PFNTVCOMPARE)TreeView_CompareCallback;
1110         tvSort.lParam = (LPARAM)this;
1111         TreeView_SortChildrenCB(GetHwnd(), &tvSort, 0 /* reserved */);
1112     }
1113 }
1114
1115 // ----------------------------------------------------------------------------
1116 // implementation
1117 // ----------------------------------------------------------------------------
1118
1119 bool wxTreeCtrl::MSWCommand(WXUINT cmd, WXWORD id)
1120 {
1121     if ( cmd == EN_UPDATE )
1122     {
1123         wxCommandEvent event(wxEVT_COMMAND_TEXT_UPDATED, id);
1124         event.SetEventObject( this );
1125         ProcessCommand(event);
1126     }
1127     else if ( cmd == EN_KILLFOCUS )
1128     {
1129         wxCommandEvent event(wxEVT_KILL_FOCUS, id);
1130         event.SetEventObject( this );
1131         ProcessCommand(event);
1132     }
1133     else
1134     {
1135         // nothing done
1136         return FALSE;
1137     }
1138
1139     // command processed
1140     return TRUE;
1141 }
1142
1143 // process WM_NOTIFY Windows message
1144 bool wxTreeCtrl::MSWOnNotify(int idCtrl, WXLPARAM lParam, WXLPARAM *result)
1145 {
1146     wxTreeEvent event(wxEVT_NULL, m_windowId);
1147     wxEventType eventType = wxEVT_NULL;
1148     NMHDR *hdr = (NMHDR *)lParam;
1149
1150     switch ( hdr->code )
1151     {
1152         case TVN_BEGINDRAG:
1153             eventType = wxEVT_COMMAND_TREE_BEGIN_DRAG;
1154             // fall through
1155
1156         case TVN_BEGINRDRAG:
1157             {
1158                 if ( eventType == wxEVT_NULL )
1159                     eventType = wxEVT_COMMAND_TREE_BEGIN_RDRAG;
1160                 //else: left drag, already set above
1161
1162                 NM_TREEVIEW *tv = (NM_TREEVIEW *)lParam;
1163
1164                 event.m_item = (WXHTREEITEM) tv->itemNew.hItem;
1165                 event.m_pointDrag = wxPoint(tv->ptDrag.x, tv->ptDrag.y);
1166                 break;
1167             }
1168
1169         case TVN_BEGINLABELEDIT:
1170             {
1171                 eventType = wxEVT_COMMAND_TREE_BEGIN_LABEL_EDIT;
1172                 TV_DISPINFO *info = (TV_DISPINFO *)lParam;
1173
1174                 event.m_item = (WXHTREEITEM) info->item.hItem;
1175                 event.m_label = info->item.pszText;
1176                 break;
1177             }
1178
1179         case TVN_DELETEITEM:
1180             {
1181                 eventType = wxEVT_COMMAND_TREE_DELETE_ITEM;
1182                 NM_TREEVIEW *tv = (NM_TREEVIEW *)lParam;
1183
1184                 event.m_item = (WXHTREEITEM) tv->itemOld.hItem;
1185                 break;
1186             }
1187
1188         case TVN_ENDLABELEDIT:
1189             {
1190                 eventType = wxEVT_COMMAND_TREE_END_LABEL_EDIT;
1191                 TV_DISPINFO *info = (TV_DISPINFO *)lParam;
1192
1193                 event.m_item = (WXHTREEITEM)info->item.hItem;
1194                 event.m_label = info->item.pszText;
1195                 break;
1196             }
1197
1198         case TVN_GETDISPINFO:
1199             eventType = wxEVT_COMMAND_TREE_GET_INFO;
1200             // fall through
1201
1202         case TVN_SETDISPINFO:
1203             {
1204                 if ( eventType == wxEVT_NULL )
1205                     eventType = wxEVT_COMMAND_TREE_SET_INFO;
1206                 //else: get, already set above
1207
1208                 TV_DISPINFO *info = (TV_DISPINFO *)lParam;
1209
1210                 event.m_item = (WXHTREEITEM) info->item.hItem;
1211                 break;
1212             }
1213
1214         case TVN_ITEMEXPANDING:
1215             event.m_code = FALSE;
1216             // fall through
1217
1218         case TVN_ITEMEXPANDED:
1219             {
1220                 NM_TREEVIEW* tv = (NM_TREEVIEW*)lParam;
1221
1222                 bool expand = FALSE;
1223                 switch ( tv->action )
1224                 {
1225                     case TVE_EXPAND:
1226                         expand = TRUE;
1227                         break;
1228
1229                     case TVE_COLLAPSE:
1230                         expand = FALSE;
1231                         break;
1232
1233                     default:
1234                         wxLogDebug(_T("unexpected code %d in TVN_ITEMEXPAND "
1235                                       "message"), tv->action);
1236                 }
1237
1238                 bool ing = (hdr->code == TVN_ITEMEXPANDING);
1239                 eventType = g_events[expand][ing];
1240
1241                 event.m_item = (WXHTREEITEM) tv->itemNew.hItem;
1242                 break;
1243             }
1244
1245         case TVN_KEYDOWN:
1246             {
1247                 eventType = wxEVT_COMMAND_TREE_KEY_DOWN;
1248                 TV_KEYDOWN *info = (TV_KEYDOWN *)lParam;
1249
1250                 event.m_code = wxCharCodeMSWToWX(info->wVKey);
1251
1252                 // a separate event for this case
1253                 if ( info->wVKey == VK_SPACE || info->wVKey == VK_RETURN )
1254                 {
1255                     wxTreeEvent event2(wxEVT_COMMAND_TREE_ITEM_ACTIVATED,
1256                                        m_windowId);
1257                     event2.SetEventObject(this);
1258
1259                     GetEventHandler()->ProcessEvent(event2);
1260                 }
1261                 break;
1262             }
1263
1264         case TVN_SELCHANGED:
1265             eventType = wxEVT_COMMAND_TREE_SEL_CHANGED;
1266             // fall through
1267
1268         case TVN_SELCHANGING:
1269             {
1270                 if ( eventType == wxEVT_NULL )
1271                     eventType = wxEVT_COMMAND_TREE_SEL_CHANGING;
1272                 //else: already set above
1273
1274                 NM_TREEVIEW* tv = (NM_TREEVIEW *)lParam;
1275
1276                 event.m_item = (WXHTREEITEM) tv->itemNew.hItem;
1277                 event.m_itemOld = (WXHTREEITEM) tv->itemOld.hItem;
1278                 break;
1279             }
1280
1281         default:
1282             return wxControl::MSWOnNotify(idCtrl, lParam, result);
1283     }
1284
1285     event.SetEventObject(this);
1286     event.SetEventType(eventType);
1287
1288     bool processed = GetEventHandler()->ProcessEvent(event);
1289
1290     // post processing
1291     switch ( hdr->code )
1292     {
1293         case TVN_DELETEITEM:
1294             {
1295                 // NB: we might process this message using wxWindows event
1296                 //     tables, but due to overhead of wxWin event system we
1297                 //     prefer to do it here ourself (otherwise deleting a tree
1298                 //     with many items is just too slow)
1299                 NM_TREEVIEW* tv = (NM_TREEVIEW *)lParam;
1300                 wxTreeItemData *data = (wxTreeItemData *)tv->itemOld.lParam;
1301                 delete data; // may be NULL, ok
1302
1303                 processed = TRUE; // Make sure we don't get called twice
1304             }
1305             break;
1306
1307         case TVN_BEGINLABELEDIT:
1308             // return TRUE to cancel label editing
1309             *result = !event.IsAllowed();
1310             break;
1311
1312         case TVN_ENDLABELEDIT:
1313             // return TRUE to set the label to the new string
1314             *result = event.IsAllowed();
1315
1316             // ensure that we don't have the text ctrl which is going to be
1317             // deleted any more
1318             DeleteTextCtrl();
1319             break;
1320
1321         case TVN_SELCHANGING:
1322         case TVN_ITEMEXPANDING:
1323             // return TRUE to prevent the action from happening
1324             *result = !event.IsAllowed();
1325             break;
1326
1327         //default:
1328             // for the other messages the return value is ignored and there is
1329             // nothing special to do
1330     }
1331
1332     return processed;
1333 }
1334
1335 // ----------------------------------------------------------------------------
1336 // Tree event
1337 // ----------------------------------------------------------------------------
1338
1339 IMPLEMENT_DYNAMIC_CLASS(wxTreeEvent, wxNotifyEvent)
1340
1341 wxTreeEvent::wxTreeEvent(wxEventType commandType, int id)
1342            : wxNotifyEvent(commandType, id)
1343 {
1344     m_code = 0;
1345     m_itemOld = 0;
1346 }
1347
1348 #endif // __WIN95__
1349