include/wx/msw/treectrl.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        treectrl.h
   3 // Purpose:     wxTreeCtrl class
   4 // Author:      Julian Smart
   5 // Modified by: Vadim Zeitlin to be less MSW-specific on 10/10/98
   6 // Created:     01/02/97
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart and Markus Holzem
   9 // Licence:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_TREECTRL_H_
  13 #define _WX_TREECTRL_H_
  14
  15 // ----------------------------------------------------------------------------
  16 // headers
  17 // ----------------------------------------------------------------------------
  18 #ifdef __GNUG__
  19     #pragma interface "treectrl.h"
  20 #endif
  21
  22 #include "wx/control.h"
  23 #include "wx/event.h"
  24 #include "wx/textctrl.h"
  25
  26 #ifdef __GNUWIN32__
  27 #  ifdef GetFirstChild
  28 #    undef GetFirstChild
  29 #  endif
  30
  31 #  ifdef GetNextSibling
  32 #    undef GetNextSibling
  33 #  endif
  34 #endif
  35
  36 // the type for "untyped" data
  37 typedef long wxDataType;
  38
  39 // fwd decl
  40 class  WXDLLEXPORT wxImageList;
  41 struct WXDLLEXPORT wxTreeViewItem;
  42
  43 // a callback function used for sorting tree items, it should return -1 if the
  44 // first item precedes the second, +1 if the second precedes the first or 0 if
  45 // they're equivalent
  46 class wxTreeItemData;
  47
  48 // ----------------------------------------------------------------------------
  49 // constants
  50 // ----------------------------------------------------------------------------
  51
  52 // values for the `flags' parameter of wxTreeCtrl::HitTest() which determine
  53 // where exactly the specified point is situated:
  54     // above the client area.
  55 static const int wxTREE_HITTEST_ABOVE            = 0x0001;
  56     // below the client area.
  57 static const int wxTREE_HITTEST_BELOW            = 0x0002;
  58     // in the client area but below the last item.
  59 static const int wxTREE_HITTEST_NOWHERE          = 0x0004;
  60     // on the button associated with an item.
  61 static const int wxTREE_HITTEST_ONITEMBUTTON     = 0x0010;
  62     // on the bitmap associated with an item.
  63 static const int wxTREE_HITTEST_ONITEMICON       = 0x0020;
  64     // in the indentation associated with an item.
  65 static const int wxTREE_HITTEST_ONITEMINDENT     = 0x0040;
  66     // on the label (string) associated with an item.
  67 static const int wxTREE_HITTEST_ONITEMLABEL      = 0x0080;
  68     // in the area to the right of an item.
  69 static const int wxTREE_HITTEST_ONITEMRIGHT      = 0x0100;
  70     // on the state icon for a tree view item that is in a user-defined state.
  71 static const int wxTREE_HITTEST_ONITEMSTATEICON  = 0x0200;
  72     // to the right of the client area.
  73 static const int wxTREE_HITTEST_TOLEFT           = 0x0400;
  74     // to the left of the client area.
  75 static const int wxTREE_HITTEST_TORIGHT          = 0x0800;
  76     // anywhere on the item
  77 static const int wxTREE_HITTEST_ONITEM  = wxTREE_HITTEST_ONITEMICON |
  78                                           wxTREE_HITTEST_ONITEMLABEL |
  79                                           wxTREE_HITTEST_ONITEMSTATEICON;
  80
  81 // NB: all the following flags are for compatbility only and will be removed in the
  82 //     next versions
  83
  84 // flags for deprecated `Expand(int action)'
  85 enum
  86 {
  87     wxTREE_EXPAND_EXPAND,
  88     wxTREE_EXPAND_COLLAPSE,
  89     wxTREE_EXPAND_COLLAPSE_RESET,
  90     wxTREE_EXPAND_TOGGLE
  91 };
  92
  93 // flags for deprecated InsertItem() variant
  94 #define wxTREE_INSERT_FIRST 0xFFFF0001
  95 #define wxTREE_INSERT_LAST  0xFFFF0002
  96
  97 // ----------------------------------------------------------------------------
  98 // wxTreeItemId identifies an element of the tree. In this implementation, it's
  99 // just a trivial wrapper around Win32 HTREEITEM. It's opaque for the
 100 // application.
 101 // ----------------------------------------------------------------------------
 102 class WXDLLEXPORT wxTreeItemId
 103 {
 104 public:
 105     // ctors
 106         // 0 is invalid value for HTREEITEM
 107     wxTreeItemId() { m_itemId = 0; }
 108
 109         // default copy ctor/assignment operator are ok for us
 110
 111     // accessors
 112         // is this a valid tree item?
 113     bool IsOk() const { return m_itemId != 0; }
 114
 115     // conversion to/from either real (system-dependent) tree item id or
 116     // to "long" which used to be the type for tree item ids in previous
 117     // versions of wxWindows
 118
 119     // for wxTreeCtrl usage only
 120     wxTreeItemId(WXHTREEITEM itemId) { m_itemId = (long)itemId; }
 121     operator WXHTREEITEM() const { return (WXHTREEITEM)m_itemId; }
 122
 123     void operator=(WXHTREEITEM item) { m_itemId = (long) item; }
 124
 125 protected:
 126     long m_itemId;
 127 };
 128
 129 // ----------------------------------------------------------------------------
 130 // wxTreeItemData is some (arbitrary) user class associated with some item. The
 131 // main advantage of having this class (compared to old untyped interface) is
 132 // that wxTreeItemData's are destroyed automatically by the tree and, as this
 133 // class has virtual dtor, it means that the memory will be automatically
 134 // freed. OTOH, we don't just use wxObject instead of wxTreeItemData because
 135 // the size of this class is critical: in any real application, each tree leaf
 136 // will have wxTreeItemData associated with it and number of leaves may be
 137 // quite big.
 138 //
 139 // Because the objects of this class are deleted by the tree, they should
 140 // always be allocated on the heap!
 141 // ----------------------------------------------------------------------------
 142 class WXDLLEXPORT wxTreeItemData : private wxTreeItemId
 143 {
 144 public:
 145     // default ctor/copy ctor/assignment operator are ok
 146
 147     // dtor is virtual and all the items are deleted by the tree control when
 148     // it's deleted, so you normally don't have to care about freeing memory
 149     // allocated in your wxTreeItemData-derived class
 150     virtual ~wxTreeItemData() { }
 151
 152     // accessors: set/get the item associated with this node
 153     void SetId(const wxTreeItemId& id) { m_itemId = id; }
 154 #ifdef __WATCOMC__
 155     const wxTreeItemId GetId() const { return m_itemId; }
 156 #else
 157     const wxTreeItemId& GetId() const { return (wxTreeItemId&) m_itemId; }
 158 #endif
 159 };
 160
 161 // ----------------------------------------------------------------------------
 162 // wxTreeCtrl
 163 // ----------------------------------------------------------------------------
 164 class WXDLLEXPORT wxTreeCtrl : public wxControl
 165 {
 166 public:
 167     // creation
 168     // --------
 169     wxTreeCtrl() { Init(); }
 170
 171     wxTreeCtrl(wxWindow *parent, wxWindowID id = -1,
 172                const wxPoint& pos = wxDefaultPosition,
 173                const wxSize& size = wxDefaultSize,
 174                long style = wxTR_HAS_BUTTONS | wxTR_LINES_AT_ROOT,
 175                const wxValidator& validator = wxDefaultValidator,
 176                const wxString& name = "wxTreeCtrl")
 177     {
 178         Create(parent, id, pos, size, style, validator, name);
 179     }
 180
 181     virtual ~wxTreeCtrl();
 182
 183     bool Create(wxWindow *parent, wxWindowID id = -1,
 184                 const wxPoint& pos = wxDefaultPosition,
 185                 const wxSize& size = wxDefaultSize,
 186                 long style = wxTR_HAS_BUTTONS | wxTR_LINES_AT_ROOT,
 187                 const wxValidator& validator = wxDefaultValidator,
 188                 const wxString& name = "wxTreeCtrl");
 189
 190     // accessors
 191     // ---------
 192
 193         // get the total number of items in the control
 194     size_t GetCount() const;
 195
 196         // indent is the number of pixels the children are indented relative to
 197         // the parents position. SetIndent() also redraws the control
 198         // immediately.
 199     unsigned int GetIndent() const;
 200     void SetIndent(unsigned int indent);
 201
 202         // image list: these functions allow to associate an image list with
 203         // the control and retrieve it. Note that the control does _not_ delete
 204         // the associated image list when it's deleted in order to allow image
 205         // lists to be shared between different controls.
 206         //
 207         // The normal image list is for the icons which correspond to the
 208         // normal tree item state (whether it is selected or not).
 209         // Additionally, the application might choose to show a state icon
 210         // which corresponds to an app-defined item state (for example,
 211         // checked/unchecked) which are taken from the state image list.
 212     wxImageList *GetImageList() const;
 213     wxImageList *GetStateImageList() const;
 214
 215     void SetImageList(wxImageList *imageList);
 216     void SetStateImageList(wxImageList *imageList);
 217
 218     // Functions to work with tree ctrl items. Unfortunately, they can _not_ be
 219     // member functions of wxTreeItem because they must know the tree the item
 220     // belongs to for Windows implementation and storing the pointer to
 221     // wxTreeCtrl in each wxTreeItem is just too much waste.
 222
 223     // accessors
 224     // ---------
 225
 226         // retrieve items label
 227     wxString GetItemText(const wxTreeItemId& item) const;
 228         // get the normal item image
 229     int GetItemImage(const wxTreeItemId& item) const;
 230         // get the selected item image
 231     int GetItemSelectedImage(const wxTreeItemId& item) const;
 232         // get the data associated with the item
 233     wxTreeItemData *GetItemData(const wxTreeItemId& item) const;
 234
 235     // modifiers
 236     // ---------
 237
 238         // set items label
 239     void SetItemText(const wxTreeItemId& item, const wxString& text);
 240         // set the normal item image
 241     void SetItemImage(const wxTreeItemId& item, int image);
 242         // set the selected item image
 243     void SetItemSelectedImage(const wxTreeItemId& item, int image);
 244         // associate some data with the item
 245     void SetItemData(const wxTreeItemId& item, wxTreeItemData *data);
 246
 247         // force appearance of [+] button near the item. This is useful to
 248         // allow the user to expand the items which don't have any children now
 249         // - but instead add them only when needed, thus minimizing memory
 250         // usage and loading time.
 251     void SetItemHasChildren(const wxTreeItemId& item, bool has = TRUE);
 252
 253         // the item will be shown in bold
 254     void SetItemBold(const wxTreeItemId& item, bool bold = TRUE);
 255
 256     // item status inquiries
 257     // ---------------------
 258
 259         // is the item visible (it might be outside the view or not expanded)?
 260     bool IsVisible(const wxTreeItemId& item) const;
 261         // does the item has any children?
 262     bool ItemHasChildren(const wxTreeItemId& item) const;
 263         // is the item expanded (only makes sense if HasChildren())?
 264     bool IsExpanded(const wxTreeItemId& item) const;
 265         // is this item currently selected (the same as has focus)?
 266     bool IsSelected(const wxTreeItemId& item) const;
 267         // is item text in bold font?
 268     bool IsBold(const wxTreeItemId& item) const;
 269
 270     // number of children
 271     // ------------------
 272
 273         // if 'recursively' is FALSE, only immediate children count, otherwise
 274         // the returned number is the number of all items in this branch
 275     size_t GetChildrenCount(const wxTreeItemId& item, bool recursively = TRUE);
 276
 277     // navigation
 278     // ----------
 279
 280     // wxTreeItemId.IsOk() will return FALSE if there is no such item
 281
 282         // get the root tree item
 283     wxTreeItemId GetRootItem() const;
 284
 285         // get the item currently selected (may return NULL if no selection)
 286     wxTreeItemId GetSelection() const;
 287
 288         // get the parent of this item (may return NULL if root)
 289     wxTreeItemId GetParent(const wxTreeItemId& item) const;
 290
 291         // for this enumeration function you must pass in a "cookie" parameter
 292         // which is opaque for the application but is necessary for the library
 293         // to make these functions reentrant (i.e. allow more than one
 294         // enumeration on one and the same object simultaneously). Of course,
 295         // the "cookie" passed to GetFirstChild() and GetNextChild() should be
 296         // the same!
 297
 298         // get the first child of this item
 299     wxTreeItemId GetFirstChild(const wxTreeItemId& item, long& _cookie) const;
 300         // get the next child
 301     wxTreeItemId GetNextChild(const wxTreeItemId& item, long& _cookie) const;
 302
 303         // get the next sibling of this item
 304     wxTreeItemId GetNextSibling(const wxTreeItemId& item) const;
 305         // get the previous sibling
 306     wxTreeItemId GetPrevSibling(const wxTreeItemId& item) const;
 307
 308         // get first visible item
 309     wxTreeItemId GetFirstVisibleItem() const;
 310         // get the next visible item: item must be visible itself!
 311         // see IsVisible() and wxTreeCtrl::GetFirstVisibleItem()
 312     wxTreeItemId GetNextVisible(const wxTreeItemId& item) const;
 313         // get the previous visible item: item must be visible itself!
 314     wxTreeItemId GetPrevVisible(const wxTreeItemId& item) const;
 315
 316     // operations
 317     // ----------
 318
 319         // add the root node to the tree
 320     wxTreeItemId AddRoot(const wxString& text,
 321                          int image = -1, int selectedImage = -1,
 322                          wxTreeItemData *data = NULL);
 323
 324         // insert a new item in as the first child of the parent
 325     wxTreeItemId PrependItem(const wxTreeItemId& parent,
 326                              const wxString& text,
 327                              int image = -1, int selectedImage = -1,
 328                              wxTreeItemData *data = NULL);
 329
 330         // insert a new item after a given one
 331     wxTreeItemId InsertItem(const wxTreeItemId& parent,
 332                             const wxTreeItemId& idPrevious,
 333                             const wxString& text,
 334                             int image = -1, int selectedImage = -1,
 335                             wxTreeItemData *data = NULL);
 336
 337         // insert a new item in as the last child of the parent
 338     wxTreeItemId AppendItem(const wxTreeItemId& parent,
 339                             const wxString& text,
 340                             int image = -1, int selectedImage = -1,
 341                             wxTreeItemData *data = NULL);
 342
 343         // delete this item and associated data if any
 344     void Delete(const wxTreeItemId& item);
 345         // delete all children (but don't delete the item itself)
 346         // NB: this won't send wxEVT_COMMAND_TREE_ITEM_DELETED events
 347     void DeleteChildren(const wxTreeItemId& item);
 348         // delete all items from the tree
 349         // NB: this won't send wxEVT_COMMAND_TREE_ITEM_DELETED events
 350     void DeleteAllItems();
 351
 352         // expand this item
 353     void Expand(const wxTreeItemId& item);
 354         // collapse the item without removing its children
 355     void Collapse(const wxTreeItemId& item);
 356         // collapse the item and remove all children
 357     void CollapseAndReset(const wxTreeItemId& item);
 358         // toggles the current state
 359     void Toggle(const wxTreeItemId& item);
 360
 361         // remove the selection from currently selected item (if any)
 362     void Unselect();
 363         // select this item
 364     void SelectItem(const wxTreeItemId& item);
 365         // make sure this item is visible (expanding the parent item and/or
 366         // scrolling to this item if necessary)
 367     void EnsureVisible(const wxTreeItemId& item);
 368         // scroll to this item (but don't expand its parent)
 369     void ScrollTo(const wxTreeItemId& item);
 370
 371         // start editing the item label: this (temporarily) replaces the item
 372         // with a one line edit control. The item will be selected if it hadn't
 373         // been before. textCtrlClass parameter allows you to create an edit
 374         // control of arbitrary user-defined class deriving from wxTextCtrl.
 375     wxTextCtrl* EditLabel(const wxTreeItemId& item,
 376                           wxClassInfo* textCtrlClass = CLASSINFO(wxTextCtrl));
 377         // returns the same pointer as StartEdit() if the item is being edited,
 378         // NULL otherwise (it's assumed that no more than one item may be
 379         // edited simultaneously)
 380     wxTextCtrl* GetEditControl() const;
 381         // end editing and accept or discard the changes to item label
 382     void EndEditLabel(const wxTreeItemId& item, bool discardChanges = FALSE);
 383
 384     // sorting
 385         // this function is called to compare 2 items and should return -1, 0
 386         // or +1 if the first item is less than, equal to or greater than the
 387         // second one. The base class version performs alphabetic comparaison
 388         // of item labels (GetText)
 389     virtual int OnCompareItems(const wxTreeItemId& item1,
 390                                const wxTreeItemId& item2);
 391         // sort the children of this item using OnCompareItems
 392         //
 393         // NB: this function is not reentrant and not MT-safe (FIXME)!
 394     void SortChildren(const wxTreeItemId& item);
 395
 396     // helpers
 397     // -------
 398
 399         // determine to which item (if any) belongs the given point (the
 400         // coordinates specified are relative to the client area of tree ctrl)
 401         // and fill the flags parameter with a bitmask of wxTREE_HITTEST_xxx
 402         // constants.
 403         //
 404         // The first function is more portable (because easier to implement
 405         // on other platforms), but the second one returns some extra info.
 406     wxTreeItemId HitTest(const wxPoint& point)
 407         { int dummy; return HitTest(point, dummy); }
 408     wxTreeItemId HitTest(const wxPoint& point, int& flags);
 409
 410         // get the bounding rectangle of the item (or of its label only)
 411         // @@@ do we really need to expose this functions to the application?
 412     void GetBoundingRect(const wxTreeItemId& item,
 413                          wxRect& rect,
 414                          bool textOnly = FALSE) const;
 415
 416     // deprecated
 417     // ----------
 418
 419     // these methods are deprecated and will be removed in future versions of
 420     // wxWindows, they're here for compatibility only, don't use them in new
 421     // code (the comments indicate why these methods are now useless and how to
 422     // replace them)
 423
 424         // use Expand, Collapse, CollapseAndReset or Toggle
 425     void ExpandItem(const wxTreeItemId& item, int action);
 426
 427         // use AddRoot, PrependItem or AppendItem
 428     wxTreeItemId InsertItem(const wxTreeItemId& parent,
 429                             const wxString& text,
 430                             int image = -1, int selImage = -1,
 431                             long insertAfter = wxTREE_INSERT_LAST);
 432
 433         // use Set/GetImageList and Set/GetStateImageList
 434     wxImageList *GetImageList(int) const
 435         { return GetImageList(); }
 436     void SetImageList(wxImageList *imageList, int)
 437         { SetImageList(imageList); }
 438
 439     // implementation
 440     // --------------
 441     void Command(wxCommandEvent& event) { ProcessCommand(event); };
 442     virtual bool MSWCommand(WXUINT param, WXWORD id);
 443     virtual bool MSWNotify(WXWPARAM wParam, WXLPARAM lParam, WXLPARAM *result);
 444
 445 protected:
 446     // SetImageList helper
 447     void SetAnyImageList(wxImageList *imageList, int which);
 448
 449     wxTextCtrl*  m_textCtrl;        // used while editing the item label
 450     wxImageList *m_imageListNormal, // images for tree elements
 451                 *m_imageListState;  // special images for app defined states
 452
 453 private:
 454     // the common part of all ctors
 455     void Init();
 456
 457     // helper functions
 458     inline bool DoGetItem(wxTreeViewItem *tvItem) const;
 459     inline void DoSetItem(wxTreeViewItem *tvItem);
 460
 461     inline void DoExpand(const wxTreeItemId& item, int flag);
 462
 463     wxTreeItemId DoInsertItem(const wxTreeItemId& parent,
 464                               wxTreeItemId hInsertAfter,
 465                               const wxString& text,
 466                               int image, int selectedImage,
 467                               wxTreeItemData *data);
 468
 469     void DeleteTextCtrl();
 470
 471     DECLARE_DYNAMIC_CLASS(wxTreeCtrl)
 472 };
 473
 474 // ----------------------------------------------------------------------------
 475 // wxTreeEvent is a special class for all events associated with tree controls
 476 //
 477 // NB: note that not all accessors make sense for all events, see the event
 478 //     descriptions below
 479 // ----------------------------------------------------------------------------
 480 class WXDLLEXPORT wxTreeEvent : public wxNotifyEvent
 481 {
 482 friend wxTreeCtrl;
 483 public:
 484     wxTreeEvent(wxEventType commandType = wxEVT_NULL, int id = 0);
 485
 486     // accessors
 487         // get the item on which the operation was performed or the newly
 488         // selected item for wxEVT_COMMAND_TREE_SEL_CHANGED/ING events
 489     wxTreeItemId GetItem() const { return m_item; }
 490
 491         // for wxEVT_COMMAND_TREE_SEL_CHANGED/ING events, get the previously
 492         // selected item
 493     wxTreeItemId GetOldItem() const { return m_itemOld; }
 494
 495         // the point where the mouse was when the drag operation started (for
 496         // wxEVT_COMMAND_TREE_BEGIN_(R)DRAG events only)
 497     wxPoint GetPoint() const { return m_pointDrag; }
 498
 499         // keyboard code (for wxEVT_COMMAND_TREE_KEY_DOWN only)
 500     int GetCode() const { return m_code; }
 501
 502 private:
 503     // @@ we could save some space by using union here
 504     int           m_code;
 505     wxTreeItemId  m_item,
 506                   m_itemOld;
 507     wxPoint       m_pointDrag;
 508
 509     DECLARE_DYNAMIC_CLASS(wxTreeEvent)
 510 };
 511
 512 typedef void (wxEvtHandler::*wxTreeEventFunction)(wxTreeEvent&);
 513
 514 // ----------------------------------------------------------------------------
 515 // macros for handling tree control events
 516 // ----------------------------------------------------------------------------
 517
 518 // GetItem() returns the item being dragged, GetPoint() the mouse coords
 519 #define EVT_TREE_BEGIN_DRAG(id, fn) { wxEVT_COMMAND_TREE_BEGIN_DRAG, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
 520 #define EVT_TREE_BEGIN_RDRAG(id, fn) { wxEVT_COMMAND_TREE_BEGIN_RDRAG, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
 521
 522 // GetItem() returns the itme whose label is being edited
 523 #define EVT_TREE_BEGIN_LABEL_EDIT(id, fn) { wxEVT_COMMAND_TREE_BEGIN_LABEL_EDIT, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
 524 #define EVT_TREE_END_LABEL_EDIT(id, fn) { wxEVT_COMMAND_TREE_END_LABEL_EDIT, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
 525
 526 // provide/update information about GetItem() item
 527 #define EVT_TREE_GET_INFO(id, fn) { wxEVT_COMMAND_TREE_GET_INFO, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
 528 #define EVT_TREE_SET_INFO(id, fn) { wxEVT_COMMAND_TREE_SET_INFO, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
 529
 530 // GetItem() is the item being expanded/collapsed, the "ING" versions can use
 531 #define EVT_TREE_ITEM_EXPANDED(id, fn) { wxEVT_COMMAND_TREE_ITEM_EXPANDED, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
 532 #define EVT_TREE_ITEM_EXPANDING(id, fn) { wxEVT_COMMAND_TREE_ITEM_EXPANDING, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
 533 #define EVT_TREE_ITEM_COLLAPSED(id, fn) { wxEVT_COMMAND_TREE_ITEM_COLLAPSED, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
 534 #define EVT_TREE_ITEM_COLLAPSING(id, fn) { wxEVT_COMMAND_TREE_ITEM_COLLAPSING, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, NULL },
 535
 536 // GetOldItem() is the item which had the selection previously, GetItem() is
 537 // the item which acquires selection
 538 #define EVT_TREE_SEL_CHANGED(id, fn) { wxEVT_COMMAND_TREE_SEL_CHANGED, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, NULL },
 539 #define EVT_TREE_SEL_CHANGING(id, fn) { wxEVT_COMMAND_TREE_SEL_CHANGING, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, NULL },
 540
 541 // GetCode() returns the key code
 542 // NB: this is the only message for which GetItem() is invalid (you may get the
 543 //     item from GetSelection())
 544 #define EVT_TREE_KEY_DOWN(id, fn) { wxEVT_COMMAND_TREE_KEY_DOWN, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, NULL },
 545
 546 // GetItem() returns the item being deleted, the associated data (if any) will
 547 // be deleted just after the return of this event handler (if any)
 548 #define EVT_TREE_DELETE_ITEM(id, fn) { wxEVT_COMMAND_TREE_DELETE_ITEM, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
 549
 550 // GetItem() returns the item that was activated (double click, enter, space)
 551 #define EVT_TREE_ITEM_ACTIVATED(id, fn) { wxEVT_COMMAND_TREE_ITEM_ACTIVATED, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, NULL },
 552
 553 #endif
 554     // _WX_TREECTRL_H_