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
  19 #ifdef __GNUG__
  20     #pragma interface "treectrl.h"
  21 #endif
  22
  23 #include "wx/control.h"
  24 #include "wx/event.h"
  25 #include "wx/textctrl.h"
  26
  27 #ifdef __GNUWIN32__
  28     // Cygwin windows.h defines these identifiers
  29     #undef GetFirstChild
  30     #undef GetNextSibling
  31 #endif // Cygwin
  32
  33 // the type for "untyped" data
  34 typedef long wxDataType;
  35
  36 // fwd decl
  37 class  WXDLLEXPORT wxImageList;
  38 struct WXDLLEXPORT wxTreeViewItem;
  39
  40 // a callback function used for sorting tree items, it should return -1 if the
  41 // first item precedes the second, +1 if the second precedes the first or 0 if
  42 // they're equivalent
  43 class wxTreeItemData;
  44
  45 // ----------------------------------------------------------------------------
  46 // constants
  47 // ----------------------------------------------------------------------------
  48
  49 // values for the `flags' parameter of wxTreeCtrl::HitTest() which determine
  50 // where exactly the specified point is situated:
  51     // above the client area.
  52 static const int wxTREE_HITTEST_ABOVE            = 0x0001;
  53     // below the client area.
  54 static const int wxTREE_HITTEST_BELOW            = 0x0002;
  55     // in the client area but below the last item.
  56 static const int wxTREE_HITTEST_NOWHERE          = 0x0004;
  57     // on the button associated with an item.
  58 static const int wxTREE_HITTEST_ONITEMBUTTON     = 0x0010;
  59     // on the bitmap associated with an item.
  60 static const int wxTREE_HITTEST_ONITEMICON       = 0x0020;
  61     // in the indentation associated with an item.
  62 static const int wxTREE_HITTEST_ONITEMINDENT     = 0x0040;
  63     // on the label (string) associated with an item.
  64 static const int wxTREE_HITTEST_ONITEMLABEL      = 0x0080;
  65     // in the area to the right of an item.
  66 static const int wxTREE_HITTEST_ONITEMRIGHT      = 0x0100;
  67     // on the state icon for a tree view item that is in a user-defined state.
  68 static const int wxTREE_HITTEST_ONITEMSTATEICON  = 0x0200;
  69     // to the right of the client area.
  70 static const int wxTREE_HITTEST_TOLEFT           = 0x0400;
  71     // to the left of the client area.
  72 static const int wxTREE_HITTEST_TORIGHT          = 0x0800;
  73     // anywhere on the item
  74 static const int wxTREE_HITTEST_ONITEM  = wxTREE_HITTEST_ONITEMICON |
  75                                           wxTREE_HITTEST_ONITEMLABEL |
  76                                           wxTREE_HITTEST_ONITEMSTATEICON;
  77
  78 // NB: all the following flags are for compatbility only and will be removed in the
  79 //     next versions
  80
  81 // flags for deprecated `Expand(int action)'
  82 enum
  83 {
  84     wxTREE_EXPAND_EXPAND,
  85     wxTREE_EXPAND_COLLAPSE,
  86     wxTREE_EXPAND_COLLAPSE_RESET,
  87     wxTREE_EXPAND_TOGGLE
  88 };
  89
  90 // flags for deprecated InsertItem() variant
  91 #define wxTREE_INSERT_FIRST 0xFFFF0001
  92 #define wxTREE_INSERT_LAST  0xFFFF0002
  93
  94 // ----------------------------------------------------------------------------
  95 // wxTreeItemId identifies an element of the tree. In this implementation, it's
  96 // just a trivial wrapper around Win32 HTREEITEM. It's opaque for the
  97 // application.
  98 // ----------------------------------------------------------------------------
  99 class WXDLLEXPORT wxTreeItemId
 100 {
 101 public:
 102     // ctors
 103         // 0 is invalid value for HTREEITEM
 104     wxTreeItemId() { m_itemId = 0; }
 105
 106         // default copy ctor/assignment operator are ok for us
 107
 108     // accessors
 109         // is this a valid tree item?
 110     bool IsOk() const { return m_itemId != 0; }
 111
 112     // conversion to/from either real (system-dependent) tree item id or
 113     // to "long" which used to be the type for tree item ids in previous
 114     // versions of wxWindows
 115
 116     // for wxTreeCtrl usage only
 117     wxTreeItemId(WXHTREEITEM itemId) { m_itemId = (long)itemId; }
 118     operator WXHTREEITEM() const { return (WXHTREEITEM)m_itemId; }
 119
 120     void operator=(WXHTREEITEM item) { m_itemId = (long) item; }
 121
 122 protected:
 123     long m_itemId;
 124 };
 125
 126 // ----------------------------------------------------------------------------
 127 // wxTreeItemData is some (arbitrary) user class associated with some item. The
 128 // main advantage of having this class (compared to old untyped interface) is
 129 // that wxTreeItemData's are destroyed automatically by the tree and, as this
 130 // class has virtual dtor, it means that the memory will be automatically
 131 // freed. OTOH, we don't just use wxObject instead of wxTreeItemData because
 132 // the size of this class is critical: in any real application, each tree leaf
 133 // will have wxTreeItemData associated with it and number of leaves may be
 134 // quite big.
 135 //
 136 // Because the objects of this class are deleted by the tree, they should
 137 // always be allocated on the heap!
 138 // ----------------------------------------------------------------------------
 139 class WXDLLEXPORT wxTreeItemData : private wxTreeItemId
 140 {
 141 public:
 142     // default ctor/copy ctor/assignment operator are ok
 143
 144     // dtor is virtual and all the items are deleted by the tree control when
 145     // it's deleted, so you normally don't have to care about freeing memory
 146     // allocated in your wxTreeItemData-derived class
 147     virtual ~wxTreeItemData() { }
 148
 149     // accessors: set/get the item associated with this node
 150     void SetId(const wxTreeItemId& id) { m_itemId = id; }
 151 #ifdef __WATCOMC__
 152     const wxTreeItemId GetId() const { return m_itemId; }
 153 #else
 154     const wxTreeItemId& GetId() const { return (wxTreeItemId&) m_itemId; }
 155 #endif
 156 };
 157
 158 // ----------------------------------------------------------------------------
 159 // wxTreeCtrl
 160 // ----------------------------------------------------------------------------
 161 class WXDLLEXPORT wxTreeCtrl : public wxControl
 162 {
 163 public:
 164     // creation
 165     // --------
 166     wxTreeCtrl() { Init(); }
 167
 168     wxTreeCtrl(wxWindow *parent, wxWindowID id = -1,
 169                const wxPoint& pos = wxDefaultPosition,
 170                const wxSize& size = wxDefaultSize,
 171                long style = wxTR_HAS_BUTTONS | wxTR_LINES_AT_ROOT,
 172                const wxValidator& validator = wxDefaultValidator,
 173                const wxString& name = "wxTreeCtrl")
 174     {
 175         Create(parent, id, pos, size, style, validator, name);
 176     }
 177
 178     virtual ~wxTreeCtrl();
 179
 180     bool Create(wxWindow *parent, wxWindowID id = -1,
 181                 const wxPoint& pos = wxDefaultPosition,
 182                 const wxSize& size = wxDefaultSize,
 183                 long style = wxTR_HAS_BUTTONS | wxTR_LINES_AT_ROOT,
 184                 const wxValidator& validator = wxDefaultValidator,
 185                 const wxString& name = "wxTreeCtrl");
 186
 187     // accessors
 188     // ---------
 189
 190         // get the total number of items in the control
 191     size_t GetCount() const;
 192
 193         // indent is the number of pixels the children are indented relative to
 194         // the parents position. SetIndent() also redraws the control
 195         // immediately.
 196     unsigned int GetIndent() const;
 197     void SetIndent(unsigned int indent);
 198
 199         // spacing is the number of pixels between the start and the Text
 200         // not implemented under wxMSW
 201     unsigned int GetSpacing() const { return 18; } // return wxGTK default
 202     void SetSpacing(unsigned int ) {}
 203
 204         // image list: these functions allow to associate an image list with
 205         // the control and retrieve it. Note that the control does _not_ delete
 206         // the associated image list when it's deleted in order to allow image
 207         // lists to be shared between different controls.
 208         //
 209         // The normal image list is for the icons which correspond to the
 210         // normal tree item state (whether it is selected or not).
 211         // Additionally, the application might choose to show a state icon
 212         // which corresponds to an app-defined item state (for example,
 213         // checked/unchecked) which are taken from the state image list.
 214     wxImageList *GetImageList() const;
 215     wxImageList *GetStateImageList() const;
 216
 217     void SetImageList(wxImageList *imageList);
 218     void SetStateImageList(wxImageList *imageList);
 219
 220     // Functions to work with tree ctrl items. Unfortunately, they can _not_ be
 221     // member functions of wxTreeItem because they must know the tree the item
 222     // belongs to for Windows implementation and storing the pointer to
 223     // wxTreeCtrl in each wxTreeItem is just too much waste.
 224
 225     // accessors
 226     // ---------
 227
 228         // retrieve items label
 229     wxString GetItemText(const wxTreeItemId& item) const;
 230         // get the normal item image
 231     int GetItemImage(const wxTreeItemId& item) const;
 232         // get the selected item image
 233     int GetItemSelectedImage(const wxTreeItemId& item) const;
 234         // get the data associated with the item
 235     wxTreeItemData *GetItemData(const wxTreeItemId& item) const;
 236
 237     // modifiers
 238     // ---------
 239
 240         // set items label
 241     void SetItemText(const wxTreeItemId& item, const wxString& text);
 242         // set the normal item image
 243     void SetItemImage(const wxTreeItemId& item, int image);
 244         // set the selected item image
 245     void SetItemSelectedImage(const wxTreeItemId& item, int image);
 246         // associate some data with the item
 247     void SetItemData(const wxTreeItemId& item, wxTreeItemData *data);
 248
 249         // force appearance of [+] button near the item. This is useful to
 250         // allow the user to expand the items which don't have any children now
 251         // - but instead add them only when needed, thus minimizing memory
 252         // usage and loading time.
 253     void SetItemHasChildren(const wxTreeItemId& item, bool has = TRUE);
 254
 255         // the item will be shown in bold
 256     void SetItemBold(const wxTreeItemId& item, bool bold = TRUE);
 257
 258         // the item will be shown with a drop highlight
 259     void SetItemDropHighlight(const wxTreeItemId& item, bool highlight = TRUE);
 260
 261     // item status inquiries
 262     // ---------------------
 263
 264         // is the item visible (it might be outside the view or not expanded)?
 265     bool IsVisible(const wxTreeItemId& item) const;
 266         // does the item has any children?
 267     bool ItemHasChildren(const wxTreeItemId& item) const;
 268         // is the item expanded (only makes sense if HasChildren())?
 269     bool IsExpanded(const wxTreeItemId& item) const;
 270         // is this item currently selected (the same as has focus)?
 271     bool IsSelected(const wxTreeItemId& item) const;
 272         // is item text in bold font?
 273     bool IsBold(const wxTreeItemId& item) const;
 274
 275     // number of children
 276     // ------------------
 277
 278         // if 'recursively' is FALSE, only immediate children count, otherwise
 279         // the returned number is the number of all items in this branch
 280     size_t GetChildrenCount(const wxTreeItemId& item, bool recursively = TRUE);
 281
 282     // navigation
 283     // ----------
 284
 285     // wxTreeItemId.IsOk() will return FALSE if there is no such item
 286
 287         // get the root tree item
 288     wxTreeItemId GetRootItem() const;
 289
 290         // get the item currently selected (may return NULL if no selection)
 291     wxTreeItemId GetSelection() const;
 292
 293         // get the parent of this item (may return NULL if root)
 294     wxTreeItemId GetParent(const wxTreeItemId& item) const;
 295
 296         // for this enumeration function you must pass in a "cookie" parameter
 297         // which is opaque for the application but is necessary for the library
 298         // to make these functions reentrant (i.e. allow more than one
 299         // enumeration on one and the same object simultaneously). Of course,
 300         // the "cookie" passed to GetFirstChild() and GetNextChild() should be
 301         // the same!
 302
 303         // get the first child of this item
 304     wxTreeItemId GetFirstChild(const wxTreeItemId& item, long& _cookie) const;
 305         // get the next child
 306     wxTreeItemId GetNextChild(const wxTreeItemId& item, long& _cookie) const;
 307         // get the last child of this item - this method doesn't use cookies
 308     wxTreeItemId GetLastChild(const wxTreeItemId& item) const;
 309
 310         // get the next sibling of this item
 311     wxTreeItemId GetNextSibling(const wxTreeItemId& item) const;
 312         // get the previous sibling
 313     wxTreeItemId GetPrevSibling(const wxTreeItemId& item) const;
 314
 315         // get first visible item
 316     wxTreeItemId GetFirstVisibleItem() const;
 317         // get the next visible item: item must be visible itself!
 318         // see IsVisible() and wxTreeCtrl::GetFirstVisibleItem()
 319     wxTreeItemId GetNextVisible(const wxTreeItemId& item) const;
 320         // get the previous visible item: item must be visible itself!
 321     wxTreeItemId GetPrevVisible(const wxTreeItemId& item) const;
 322
 323     // operations
 324     // ----------
 325
 326         // add the root node to the tree
 327     wxTreeItemId AddRoot(const wxString& text,
 328                          int image = -1, int selectedImage = -1,
 329                          wxTreeItemData *data = NULL);
 330
 331         // insert a new item in as the first child of the parent
 332     wxTreeItemId PrependItem(const wxTreeItemId& parent,
 333                              const wxString& text,
 334                              int image = -1, int selectedImage = -1,
 335                              wxTreeItemData *data = NULL);
 336
 337         // insert a new item after a given one
 338     wxTreeItemId InsertItem(const wxTreeItemId& parent,
 339                             const wxTreeItemId& idPrevious,
 340                             const wxString& text,
 341                             int image = -1, int selectedImage = -1,
 342                             wxTreeItemData *data = NULL);
 343
 344         // insert a new item in as the last child of the parent
 345     wxTreeItemId AppendItem(const wxTreeItemId& parent,
 346                             const wxString& text,
 347                             int image = -1, int selectedImage = -1,
 348                             wxTreeItemData *data = NULL);
 349
 350         // delete this item and associated data if any
 351     void Delete(const wxTreeItemId& item);
 352         // delete all children (but don't delete the item itself)
 353         // NB: this won't send wxEVT_COMMAND_TREE_ITEM_DELETED events
 354     void DeleteChildren(const wxTreeItemId& item);
 355         // delete all items from the tree
 356         // NB: this won't send wxEVT_COMMAND_TREE_ITEM_DELETED events
 357     void DeleteAllItems();
 358
 359         // expand this item
 360     void Expand(const wxTreeItemId& item);
 361         // collapse the item without removing its children
 362     void Collapse(const wxTreeItemId& item);
 363         // collapse the item and remove all children
 364     void CollapseAndReset(const wxTreeItemId& item);
 365         // toggles the current state
 366     void Toggle(const wxTreeItemId& item);
 367
 368         // remove the selection from currently selected item (if any)
 369     void Unselect();
 370         // select this item
 371     void SelectItem(const wxTreeItemId& item);
 372         // make sure this item is visible (expanding the parent item and/or
 373         // scrolling to this item if necessary)
 374     void EnsureVisible(const wxTreeItemId& item);
 375         // scroll to this item (but don't expand its parent)
 376     void ScrollTo(const wxTreeItemId& item);
 377
 378         // start editing the item label: this (temporarily) replaces the item
 379         // with a one line edit control. The item will be selected if it hadn't
 380         // been before. textCtrlClass parameter allows you to create an edit
 381         // control of arbitrary user-defined class deriving from wxTextCtrl.
 382     wxTextCtrl* EditLabel(const wxTreeItemId& item,
 383                           wxClassInfo* textCtrlClass = CLASSINFO(wxTextCtrl));
 384         // returns the same pointer as StartEdit() if the item is being edited,
 385         // NULL otherwise (it's assumed that no more than one item may be
 386         // edited simultaneously)
 387     wxTextCtrl* GetEditControl() const;
 388         // end editing and accept or discard the changes to item label
 389     void EndEditLabel(const wxTreeItemId& item, bool discardChanges = FALSE);
 390
 391     // sorting
 392         // this function is called to compare 2 items and should return -1, 0
 393         // or +1 if the first item is less than, equal to or greater than the
 394         // second one. The base class version performs alphabetic comparaison
 395         // of item labels (GetText)
 396     virtual int OnCompareItems(const wxTreeItemId& item1,
 397                                const wxTreeItemId& item2);
 398         // sort the children of this item using OnCompareItems
 399         //
 400         // NB: this function is not reentrant and not MT-safe (FIXME)!
 401     void SortChildren(const wxTreeItemId& item);
 402
 403     // helpers
 404     // -------
 405
 406         // determine to which item (if any) belongs the given point (the
 407         // coordinates specified are relative to the client area of tree ctrl)
 408         // and fill the flags parameter with a bitmask of wxTREE_HITTEST_xxx
 409         // constants.
 410         //
 411         // The first function is more portable (because easier to implement
 412         // on other platforms), but the second one returns some extra info.
 413     wxTreeItemId HitTest(const wxPoint& point)
 414         { int dummy; return HitTest(point, dummy); }
 415     wxTreeItemId HitTest(const wxPoint& point, int& flags);
 416
 417         // get the bounding rectangle of the item (or of its label only)
 418     bool GetBoundingRect(const wxTreeItemId& item,
 419                          wxRect& rect,
 420                          bool textOnly = FALSE) const;
 421
 422     // deprecated
 423     // ----------
 424
 425     // these methods are deprecated and will be removed in future versions of
 426     // wxWindows, they're here for compatibility only, don't use them in new
 427     // code (the comments indicate why these methods are now useless and how to
 428     // replace them)
 429
 430         // use Expand, Collapse, CollapseAndReset or Toggle
 431     void ExpandItem(const wxTreeItemId& item, int action);
 432
 433         // use AddRoot, PrependItem or AppendItem
 434     wxTreeItemId InsertItem(const wxTreeItemId& parent,
 435                             const wxString& text,
 436                             int image = -1, int selImage = -1,
 437                             long insertAfter = wxTREE_INSERT_LAST);
 438
 439         // use Set/GetImageList and Set/GetStateImageList
 440     wxImageList *GetImageList(int) const
 441         { return GetImageList(); }
 442     void SetImageList(wxImageList *imageList, int)
 443         { SetImageList(imageList); }
 444
 445     // implementation
 446     // --------------
 447     virtual bool MSWCommand(WXUINT param, WXWORD id);
 448     virtual bool MSWOnNotify(int idCtrl, WXLPARAM lParam, WXLPARAM *result);
 449
 450 protected:
 451     // SetImageList helper
 452     void SetAnyImageList(wxImageList *imageList, int which);
 453
 454     wxTextCtrl*  m_textCtrl;        // used while editing the item label
 455     wxImageList *m_imageListNormal, // images for tree elements
 456                 *m_imageListState;  // special images for app defined states
 457
 458 private:
 459     // the common part of all ctors
 460     void Init();
 461
 462     // helper functions
 463     inline bool DoGetItem(wxTreeViewItem *tvItem) const;
 464     inline void DoSetItem(wxTreeViewItem *tvItem);
 465
 466     inline void DoExpand(const wxTreeItemId& item, int flag);
 467
 468     wxTreeItemId DoInsertItem(const wxTreeItemId& parent,
 469                               wxTreeItemId hInsertAfter,
 470                               const wxString& text,
 471                               int image, int selectedImage,
 472                               wxTreeItemData *data);
 473
 474     void DeleteTextCtrl();
 475
 476     DECLARE_DYNAMIC_CLASS(wxTreeCtrl)
 477 };
 478
 479 // ----------------------------------------------------------------------------
 480 // wxTreeEvent is a special class for all events associated with tree controls
 481 //
 482 // NB: note that not all accessors make sense for all events, see the event
 483 //     descriptions below
 484 // ----------------------------------------------------------------------------
 485 class WXDLLEXPORT wxTreeEvent : public wxNotifyEvent
 486 {
 487 friend wxTreeCtrl;
 488 public:
 489     wxTreeEvent(wxEventType commandType = wxEVT_NULL, int id = 0);
 490
 491     // accessors
 492         // get the item on which the operation was performed or the newly
 493         // selected item for wxEVT_COMMAND_TREE_SEL_CHANGED/ING events
 494     wxTreeItemId GetItem() const { return m_item; }
 495
 496         // for wxEVT_COMMAND_TREE_SEL_CHANGED/ING events, get the previously
 497         // selected item
 498     wxTreeItemId GetOldItem() const { return m_itemOld; }
 499
 500         // the point where the mouse was when the drag operation started (for
 501         // wxEVT_COMMAND_TREE_BEGIN_(R)DRAG events only)
 502     wxPoint GetPoint() const { return m_pointDrag; }
 503
 504         // keyboard code (for wxEVT_COMMAND_TREE_KEY_DOWN only)
 505     int GetCode() const { return m_code; }
 506
 507 private:
 508     // @@ we could save some space by using union here
 509     int           m_code;
 510     wxTreeItemId  m_item,
 511                   m_itemOld;
 512     wxPoint       m_pointDrag;
 513
 514     DECLARE_DYNAMIC_CLASS(wxTreeEvent)
 515 };
 516
 517 typedef void (wxEvtHandler::*wxTreeEventFunction)(wxTreeEvent&);
 518
 519 // ----------------------------------------------------------------------------
 520 // macros for handling tree control events
 521 // ----------------------------------------------------------------------------
 522
 523 // GetItem() returns the item being dragged, GetPoint() the mouse coords
 524 #define EVT_TREE_BEGIN_DRAG(id, fn) { wxEVT_COMMAND_TREE_BEGIN_DRAG, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
 525 #define EVT_TREE_BEGIN_RDRAG(id, fn) { wxEVT_COMMAND_TREE_BEGIN_RDRAG, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
 526
 527 // GetItem() returns the itme whose label is being edited
 528 #define EVT_TREE_BEGIN_LABEL_EDIT(id, fn) { wxEVT_COMMAND_TREE_BEGIN_LABEL_EDIT, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
 529 #define EVT_TREE_END_LABEL_EDIT(id, fn) { wxEVT_COMMAND_TREE_END_LABEL_EDIT, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
 530
 531 // provide/update information about GetItem() item
 532 #define EVT_TREE_GET_INFO(id, fn) { wxEVT_COMMAND_TREE_GET_INFO, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
 533 #define EVT_TREE_SET_INFO(id, fn) { wxEVT_COMMAND_TREE_SET_INFO, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
 534
 535 // GetItem() is the item being expanded/collapsed, the "ING" versions can use
 536 #define EVT_TREE_ITEM_EXPANDED(id, fn) { wxEVT_COMMAND_TREE_ITEM_EXPANDED, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
 537 #define EVT_TREE_ITEM_EXPANDING(id, fn) { wxEVT_COMMAND_TREE_ITEM_EXPANDING, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
 538 #define EVT_TREE_ITEM_COLLAPSED(id, fn) { wxEVT_COMMAND_TREE_ITEM_COLLAPSED, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
 539 #define EVT_TREE_ITEM_COLLAPSING(id, fn) { wxEVT_COMMAND_TREE_ITEM_COLLAPSING, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, NULL },
 540
 541 // GetOldItem() is the item which had the selection previously, GetItem() is
 542 // the item which acquires selection
 543 #define EVT_TREE_SEL_CHANGED(id, fn) { wxEVT_COMMAND_TREE_SEL_CHANGED, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, NULL },
 544 #define EVT_TREE_SEL_CHANGING(id, fn) { wxEVT_COMMAND_TREE_SEL_CHANGING, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, NULL },
 545
 546 // GetCode() returns the key code
 547 // NB: this is the only message for which GetItem() is invalid (you may get the
 548 //     item from GetSelection())
 549 #define EVT_TREE_KEY_DOWN(id, fn) { wxEVT_COMMAND_TREE_KEY_DOWN, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, NULL },
 550
 551 // GetItem() returns the item being deleted, the associated data (if any) will
 552 // be deleted just after the return of this event handler (if any)
 553 #define EVT_TREE_DELETE_ITEM(id, fn) { wxEVT_COMMAND_TREE_DELETE_ITEM, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
 554
 555 // GetItem() returns the item that was activated (double click, enter, space)
 556 #define EVT_TREE_ITEM_ACTIVATED(id, fn) { wxEVT_COMMAND_TREE_ITEM_ACTIVATED, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, NULL },
 557
 558 #endif
 559     // _WX_TREECTRL_H_