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
  25 #ifdef __MINGW32__
  26 #undef GetFirstChild()
  27 #undef GetNextSibling()
  28 #endif
  29
  30 // the type for "untyped" data
  31 typedef long wxDataType;
  32
  33 // fwd decl
  34 class  WXDLLEXPORT wxImageList;
  35 struct WXDLLEXPORT wxTreeViewItem;
  36
  37 // a callback function used for sorting tree items, it should return -1 if the
  38 // first item precedes the second, +1 if the second precedes the first or 0 if
  39 // they're equivalent
  40 class wxTreeItemData;
  41 typedef int (*wxTreeItemCmpFunc)(wxTreeItemData *item1, wxTreeItemData *item2);
  42
  43 // ----------------------------------------------------------------------------
  44 // constants
  45 // ----------------------------------------------------------------------------
  46
  47 // values for the `flags' parameter of wxTreeCtrl::HitTest() which determine
  48 // where exactly the specified point is situated:
  49     // above the client area.
  50 static const int wxTREE_HITTEST_ABOVE            = 0x0001;
  51     // below the client area.
  52 static const int wxTREE_HITTEST_BELOW            = 0x0002;
  53     // in the client area but below the last item.
  54 static const int wxTREE_HITTEST_NOWHERE          = 0x0004;
  55     // on the button associated with an item.
  56 static const int wxTREE_HITTEST_ONITEMBUTTON     = 0x0010;
  57     // on the bitmap associated with an item.
  58 static const int wxTREE_HITTEST_ONITEMICON       = 0x0020;
  59     // in the indentation associated with an item.
  60 static const int wxTREE_HITTEST_ONITEMINDENT     = 0x0040;
  61     // on the label (string) associated with an item.
  62 static const int wxTREE_HITTEST_ONITEMLABEL      = 0x0080;
  63     // in the area to the right of an item.
  64 static const int wxTREE_HITTEST_ONITEMRIGHT      = 0x0100;
  65     // on the state icon for a tree view item that is in a user-defined state.
  66 static const int wxTREE_HITTEST_ONITEMSTATEICON  = 0x0200;
  67     // to the right of the client area.
  68 static const int wxTREE_HITTEST_TOLEFT           = 0x0400;
  69     // to the left of the client area.
  70 static const int wxTREE_HITTEST_TORIGHT          = 0x0800;
  71     // anywhere on the item
  72 static const int wxTREE_HITTEST_ONITEM  = wxTREE_HITTEST_ONITEMICON |
  73                                           wxTREE_HITTEST_ONITEMLABEL |
  74                                           wxTREE_HITTEST_ONITEMSTATEICON;
  75
  76 // NB: all the following flags are for compatbility only and will be removed in the
  77 //     next versions
  78
  79 // flags for deprecated `Expand(int action)'
  80 enum
  81 {
  82     wxTREE_EXPAND_EXPAND,
  83     wxTREE_EXPAND_COLLAPSE,
  84     wxTREE_EXPAND_COLLAPSE_RESET,
  85     wxTREE_EXPAND_TOGGLE
  86 };
  87
  88 // flags for deprecated InsertItem() variant
  89 #define wxTREE_INSERT_FIRST 0xFFFF0001
  90 #define wxTREE_INSERT_LAST  0xFFFF0002
  91
  92 // ----------------------------------------------------------------------------
  93 // wxTreeItemId identifies an element of the tree. In this implementation, it's
  94 // just a trivial wrapper around Win32 HTREEITEM. It's opaque for the
  95 // application.
  96 // ----------------------------------------------------------------------------
  97 class WXDLLEXPORT wxTreeItemId
  98 {
  99 public:
 100     // ctors
 101         // 0 is invalid value for HTREEITEM
 102     wxTreeItemId() { m_itemId = 0; }
 103
 104         // default copy ctor/assignment operator are ok for us
 105
 106     // accessors
 107         // is this a valid tree item?
 108     bool IsOk() const { return m_itemId != 0; }
 109
 110     // conversion to/from either real (system-dependent) tree item id or
 111     // to "long" which used to be the type for tree item ids in previous
 112     // versions of wxWindows
 113
 114     // for wxTreeCtrl usage only
 115     wxTreeItemId(WXHTREEITEM itemId) { m_itemId = (long)itemId; }
 116     operator WXHTREEITEM() const { return (WXHTREEITEM)m_itemId; }
 117
 118     void operator=(WXHTREEITEM item) { m_itemId = (long) item; }
 119
 120 protected:
 121     long m_itemId;
 122 };
 123
 124 // ----------------------------------------------------------------------------
 125 // wxTreeItemData is some (arbitrary) user class associated with some item. The
 126 // main advantage of having this class (compared to old untyped interface) is
 127 // that wxTreeItemData's are destroyed automatically by the tree and, as this
 128 // class has virtual dtor, it means that the memory will be automatically
 129 // freed. OTOH, we don't just use wxObject instead of wxTreeItemData because
 130 // the size of this class is critical: in any real application, each tree leaf
 131 // will have wxTreeItemData associated with it and number of leaves may be
 132 // quite big.
 133 //
 134 // Because the objects of this class are deleted by the tree, they should
 135 // always be allocated on the heap!
 136 // ----------------------------------------------------------------------------
 137 class WXDLLEXPORT wxTreeItemData : private wxTreeItemId
 138 {
 139 public:
 140     // default ctor/copy ctor/assignment operator are ok
 141
 142     // dtor is virtual and all the items are deleted by the tree control when
 143     // it's deleted, so you normally don't have to care about freeing memory
 144     // allocated in your wxTreeItemData-derived class
 145     virtual ~wxTreeItemData() { }
 146
 147     // accessors: set/get the item associated with this node
 148     void SetId(const wxTreeItemId& id) { m_itemId = id; }
 149     const wxTreeItemId& GetId() const { return (wxTreeItemId&) m_itemId; }
 150 };
 151
 152 // ----------------------------------------------------------------------------
 153 // wxTreeCtrl
 154 // ----------------------------------------------------------------------------
 155 class WXDLLEXPORT wxTreeCtrl : public wxControl
 156 {
 157 public:
 158     // creation
 159     // --------
 160     wxTreeCtrl() { Init(); }
 161
 162     wxTreeCtrl(wxWindow *parent, wxWindowID id = -1,
 163                const wxPoint& pos = wxDefaultPosition,
 164                const wxSize& size = wxDefaultSize,
 165                long style = wxTR_HAS_BUTTONS | wxTR_LINES_AT_ROOT,
 166                const wxValidator& validator = wxDefaultValidator,
 167                const wxString& name = "wxTreeCtrl")
 168     {
 169         Create(parent, id, pos, size, style, validator, name);
 170     }
 171
 172     virtual ~wxTreeCtrl();
 173
 174     bool Create(wxWindow *parent, wxWindowID id = -1,
 175                 const wxPoint& pos = wxDefaultPosition,
 176                 const wxSize& size = wxDefaultSize,
 177                 long style = wxTR_HAS_BUTTONS | wxTR_LINES_AT_ROOT,
 178                 const wxValidator& validator = wxDefaultValidator,
 179                 const wxString& name = "wxTreeCtrl");
 180
 181     // accessors
 182     // ---------
 183
 184         // get the total number of items in the control
 185     size_t GetCount() const;
 186
 187         // indent is the number of pixels the children are indented relative to
 188         // the parents position. SetIndent() also redraws the control
 189         // immediately.
 190     unsigned int GetIndent() const;
 191     void SetIndent(unsigned int indent);
 192
 193         // image list: these functions allow to associate an image list with
 194         // the control and retrieve it. Note that the control does _not_ delete
 195         // the associated image list when it's deleted in order to allow image
 196         // lists to be shared between different controls.
 197         //
 198         // The normal image list is for the icons which correspond to the
 199         // normal tree item state (whether it is selected or not).
 200         // Additionally, the application might choose to show a state icon
 201         // which corresponds to an app-defined item state (for example,
 202         // checked/unchecked) which are taken from the state image list.
 203     wxImageList *GetImageList() const;
 204     wxImageList *GetStateImageList() const;
 205
 206     void SetImageList(wxImageList *imageList);
 207     void SetStateImageList(wxImageList *imageList);
 208
 209     // Functions to work with tree ctrl items. Unfortunately, they can _not_ be
 210     // member functions of wxTreeItem because they must know the tree the item
 211     // belongs to for Windows implementation and storing the pointer to
 212     // wxTreeCtrl in each wxTreeItem is just too much waste.
 213
 214     // accessors
 215     // ---------
 216
 217         // retrieve items label
 218     wxString GetItemText(const wxTreeItemId& item) const;
 219         // get the normal item image
 220     int GetItemImage(const wxTreeItemId& item) const;
 221         // get the selected item image
 222     int GetItemSelectedImage(const wxTreeItemId& item) const;
 223         // get the data associated with the item
 224     wxTreeItemData *GetItemData(const wxTreeItemId& item) const;
 225
 226     // modifiers
 227     // ---------
 228
 229         // set items label
 230     void SetItemText(const wxTreeItemId& item, const wxString& text);
 231         // set the normal item image
 232     void SetItemImage(const wxTreeItemId& item, int image);
 233         // set the selected item image
 234     void SetItemSelectedImage(const wxTreeItemId& item, int image);
 235         // associate some data with the item
 236     void SetItemData(const wxTreeItemId& item, wxTreeItemData *data);
 237
 238         // force appearance of [+] button near the item. This is useful to
 239         // allow the user to expand the items which don't have any children now
 240         // - but instead add them only when needed, thus minimizing memory
 241         // usage and loading time.
 242     void SetItemHasChildren(const wxTreeItemId& item, bool has = TRUE);
 243
 244         // the item will be shown in bold
 245     void SetItemBold(const wxTreeItemId& item, bool bold = TRUE);
 246
 247     // item status inquiries
 248     // ---------------------
 249
 250         // is the item visible (it might be outside the view or not expanded)?
 251     bool IsVisible(const wxTreeItemId& item) const;
 252         // does the item has any children?
 253     bool ItemHasChildren(const wxTreeItemId& item) const;
 254         // is the item expanded (only makes sense if HasChildren())?
 255     bool IsExpanded(const wxTreeItemId& item) const;
 256         // is this item currently selected (the same as has focus)?
 257     bool IsSelected(const wxTreeItemId& item) const;
 258         // is item text in bold font?
 259     bool IsBold(const wxTreeItemId& item) const;
 260
 261     // number of children
 262     // ------------------
 263
 264         // if 'recursively' is FALSE, only immediate children count, otherwise
 265         // the returned number is the number of all items in this branch
 266     size_t GetChildrenCount(const wxTreeItemId& item, bool recursively = TRUE);
 267
 268     // navigation
 269     // ----------
 270
 271     // wxTreeItemId.IsOk() will return FALSE if there is no such item
 272
 273         // get the root tree item
 274     wxTreeItemId GetRootItem() const;
 275
 276         // get the item currently selected (may return NULL if no selection)
 277     wxTreeItemId GetSelection() const;
 278
 279         // get the parent of this item (may return NULL if root)
 280     wxTreeItemId GetParent(const wxTreeItemId& item) const;
 281
 282         // for this enumeration function you must pass in a "cookie" parameter
 283         // which is opaque for the application but is necessary for the library
 284         // to make these functions reentrant (i.e. allow more than one
 285         // enumeration on one and the same object simultaneously). Of course,
 286         // the "cookie" passed to GetFirstChild() and GetNextChild() should be
 287         // the same!
 288
 289         // get the first child of this item
 290     wxTreeItemId GetFirstChild(const wxTreeItemId& item, long& _cookie) const;
 291         // get the next child
 292     wxTreeItemId GetNextChild(const wxTreeItemId& item, long& _cookie) const;
 293
 294         // get the next sibling of this item
 295     wxTreeItemId GetNextSibling(const wxTreeItemId& item) const;
 296         // get the previous sibling
 297     wxTreeItemId GetPrevSibling(const wxTreeItemId& item) const;
 298
 299         // get first visible item
 300     wxTreeItemId GetFirstVisibleItem() const;
 301         // get the next visible item: item must be visible itself!
 302         // see IsVisible() and wxTreeCtrl::GetFirstVisibleItem()
 303     wxTreeItemId GetNextVisible(const wxTreeItemId& item) const;
 304         // get the previous visible item: item must be visible itself!
 305     wxTreeItemId GetPrevVisible(const wxTreeItemId& item) const;
 306
 307     // operations
 308     // ----------
 309
 310         // add the root node to the tree
 311     wxTreeItemId AddRoot(const wxString& text,
 312                          int image = -1, int selectedImage = -1,
 313                          wxTreeItemData *data = NULL);
 314
 315         // insert a new item in as the first child of the parent
 316     wxTreeItemId PrependItem(const wxTreeItemId& parent,
 317                              const wxString& text,
 318                              int image = -1, int selectedImage = -1,
 319                              wxTreeItemData *data = NULL);
 320
 321         // insert a new item after a given one
 322     wxTreeItemId InsertItem(const wxTreeItemId& parent,
 323                             const wxTreeItemId& idPrevious,
 324                             const wxString& text,
 325                             int image = -1, int selectedImage = -1,
 326                             wxTreeItemData *data = NULL);
 327
 328         // insert a new item in as the last child of the parent
 329     wxTreeItemId AppendItem(const wxTreeItemId& parent,
 330                             const wxString& text,
 331                             int image = -1, int selectedImage = -1,
 332                             wxTreeItemData *data = NULL);
 333
 334         // delete this item and associated data if any
 335     void Delete(const wxTreeItemId& item);
 336         // delete all items from the tree
 337     void DeleteAllItems();
 338
 339         // expand this item
 340     void Expand(const wxTreeItemId& item);
 341         // collapse the item without removing its children
 342     void Collapse(const wxTreeItemId& item);
 343         // collapse the item and remove all children
 344     void CollapseAndReset(const wxTreeItemId& item);
 345         // toggles the current state
 346     void Toggle(const wxTreeItemId& item);
 347
 348         // remove the selection from currently selected item (if any)
 349     void Unselect();
 350         // select this item
 351     void SelectItem(const wxTreeItemId& item);
 352         // make sure this item is visible (expanding the parent item and/or
 353         // scrolling to this item if necessary)
 354     void EnsureVisible(const wxTreeItemId& item);
 355         // scroll to this item (but don't expand its parent)
 356     void ScrollTo(const wxTreeItemId& item);
 357
 358         // start editing the item label: this (temporarily) replaces the item
 359         // with a one line edit control. The item will be selected if it hadn't
 360         // been before. textCtrlClass parameter allows you to create an edit
 361         // control of arbitrary user-defined class deriving from wxTextCtrl.
 362     wxTextCtrl* EditLabel(const wxTreeItemId& item,
 363                           wxClassInfo* textCtrlClass = CLASSINFO(wxTextCtrl));
 364         // returns the same pointer as StartEdit() if the item is being edited,
 365         // NULL otherwise (it's assumed that no more than one item may be
 366         // edited simultaneously)
 367     wxTextCtrl* GetEditControl() const;
 368         // end editing and accept or discard the changes to item label
 369     void EndEditLabel(const wxTreeItemId& item, bool discardChanges = FALSE);
 370
 371         // sort the children of this item using the specified callback function
 372         // (it should return -1, 0 or +1 as usual), if it's not specified
 373         // alphabetical comparaison is performed.
 374         //
 375         // NB: this function is not reentrant!
 376     void SortChildren(const wxTreeItemId& item,
 377                       wxTreeItemCmpFunc *cmpFunction = NULL);
 378
 379     // helpers
 380     // -------
 381
 382         // determine to which item (if any) belongs the given point (the
 383         // coordinates specified are relative to the client area of tree ctrl)
 384         // and fill the flags parameter with a bitmask of wxTREE_HITTEST_xxx
 385         // constants.
 386         //
 387         // The first function is more portable (because easier to implement
 388         // on other platforms), but the second one returns some extra info.
 389     wxTreeItemId HitTest(const wxPoint& point)
 390         { int dummy; return HitTest(point, dummy); }
 391     wxTreeItemId HitTest(const wxPoint& point, int& flags);
 392
 393         // get the bounding rectangle of the item (or of its label only)
 394         // @@@ do we really need to expose this functions to the application?
 395     void GetBoundingRect(const wxTreeItemId& item,
 396                          wxRect& rect,
 397                          bool textOnly = FALSE) const;
 398
 399     // deprecated
 400     // ----------
 401
 402     // these methods are deprecated and will be removed in future versions of
 403     // wxWindows, they're here for compatibility only, don't use them in new
 404     // code (the comments indicate why these methods are now useless and how to
 405     // replace them)
 406
 407         // use Expand, Collapse, CollapseAndReset or Toggle
 408     void ExpandItem(const wxTreeItemId& item, int action);
 409
 410         // use AddRoot, PrependItem or AppendItem
 411     wxTreeItemId InsertItem(const wxTreeItemId& parent,
 412                             const wxString& text,
 413                             int image = -1, int selImage = -1,
 414                             long insertAfter = wxTREE_INSERT_LAST);
 415
 416         // use Set/GetImageList and Set/GetStateImageList
 417     wxImageList *GetImageList(int) const
 418         { return GetImageList(); }
 419     void SetImageList(wxImageList *imageList, int)
 420         { SetImageList(imageList); }
 421
 422     // implementation
 423     // --------------
 424     void Command(wxCommandEvent& event) { ProcessCommand(event); };
 425     virtual bool MSWCommand(WXUINT param, WXWORD id);
 426     virtual bool MSWNotify(WXWPARAM wParam, WXLPARAM lParam, WXLPARAM *result);
 427
 428 protected:
 429     // SetImageList helper
 430     void SetAnyImageList(wxImageList *imageList, int which);
 431
 432     wxTextCtrl*  m_textCtrl;        // used while editing the item label
 433     wxImageList *m_imageListNormal, // images for tree elements
 434                 *m_imageListState;  // special images for app defined states
 435
 436 private:
 437     // the common part of all ctors
 438     void Init();
 439
 440     // helper functions
 441     inline bool DoGetItem(wxTreeViewItem *tvItem) const;
 442     inline void DoSetItem(wxTreeViewItem *tvItem);
 443
 444     inline void DoExpand(const wxTreeItemId& item, int flag);
 445
 446     wxTreeItemId DoInsertItem(const wxTreeItemId& parent,
 447                               wxTreeItemId hInsertAfter,
 448                               const wxString& text,
 449                               int image, int selectedImage,
 450                               wxTreeItemData *data);
 451
 452     void DeleteTextCtrl();
 453
 454     DECLARE_DYNAMIC_CLASS(wxTreeCtrl)
 455 };
 456
 457 // ----------------------------------------------------------------------------
 458 // wxTreeEvent is a special class for all events associated with tree controls
 459 //
 460 // NB: note that not all accessors make sense for all events, see the event
 461 //     descriptions below
 462 // ----------------------------------------------------------------------------
 463 class WXDLLEXPORT wxTreeEvent : public wxNotifyEvent
 464 {
 465 friend wxTreeCtrl;
 466 public:
 467     wxTreeEvent(wxEventType commandType = wxEVT_NULL, int id = 0);
 468
 469     // accessors
 470         // get the item on which the operation was performed or the newly
 471         // selected item for wxEVT_COMMAND_TREE_SEL_CHANGED/ING events
 472     wxTreeItemId GetItem() const { return m_item; }
 473
 474         // for wxEVT_COMMAND_TREE_SEL_CHANGED/ING events, get the previously
 475         // selected item
 476     wxTreeItemId GetOldItem() const { return m_itemOld; }
 477
 478         // the point where the mouse was when the drag operation started (for
 479         // wxEVT_COMMAND_TREE_BEGIN_(R)DRAG events only)
 480     wxPoint GetPoint() const { return m_pointDrag; }
 481
 482         // keyboard code (for wxEVT_COMMAND_TREE_KEY_DOWN only)
 483     int GetCode() const { return m_code; }
 484
 485 private:
 486     // @@ we could save some space by using union here
 487     int           m_code;
 488     wxTreeItemId  m_item,
 489                   m_itemOld;
 490     wxPoint       m_pointDrag;
 491
 492     DECLARE_DYNAMIC_CLASS(wxTreeEvent)
 493 };
 494
 495 typedef void (wxEvtHandler::*wxTreeEventFunction)(wxTreeEvent&);
 496
 497 // ----------------------------------------------------------------------------
 498 // macros for handling tree control events
 499 // ----------------------------------------------------------------------------
 500
 501 // GetItem() returns the item being dragged, GetPoint() the mouse coords
 502 #define EVT_TREE_BEGIN_DRAG(id, fn) { wxEVT_COMMAND_TREE_BEGIN_DRAG, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
 503 #define EVT_TREE_BEGIN_RDRAG(id, fn) { wxEVT_COMMAND_TREE_BEGIN_RDRAG, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
 504
 505 // GetItem() returns the itme whose label is being edited
 506 #define EVT_TREE_BEGIN_LABEL_EDIT(id, fn) { wxEVT_COMMAND_TREE_BEGIN_LABEL_EDIT, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
 507 #define EVT_TREE_END_LABEL_EDIT(id, fn) { wxEVT_COMMAND_TREE_END_LABEL_EDIT, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
 508
 509 // provide/update information about GetItem() item
 510 #define EVT_TREE_GET_INFO(id, fn) { wxEVT_COMMAND_TREE_GET_INFO, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
 511 #define EVT_TREE_SET_INFO(id, fn) { wxEVT_COMMAND_TREE_SET_INFO, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
 512
 513 // GetItem() is the item being expanded/collapsed, the "ING" versions can use
 514 #define EVT_TREE_ITEM_EXPANDED(id, fn) { wxEVT_COMMAND_TREE_ITEM_EXPANDED, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
 515 #define EVT_TREE_ITEM_EXPANDING(id, fn) { wxEVT_COMMAND_TREE_ITEM_EXPANDING, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
 516 #define EVT_TREE_ITEM_COLLAPSED(id, fn) { wxEVT_COMMAND_TREE_ITEM_COLLAPSED, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
 517 #define EVT_TREE_ITEM_COLLAPSING(id, fn) { wxEVT_COMMAND_TREE_ITEM_COLLAPSING, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, NULL },
 518
 519 // GetOldItem() is the item which had the selection previously, GetItem() is
 520 // the item which acquires selection
 521 #define EVT_TREE_SEL_CHANGED(id, fn) { wxEVT_COMMAND_TREE_SEL_CHANGED, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, NULL },
 522 #define EVT_TREE_SEL_CHANGING(id, fn) { wxEVT_COMMAND_TREE_SEL_CHANGING, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, NULL },
 523
 524 // GetCode() returns the key code
 525 // NB: this is the only message for which GetItem() is invalid (you may get the
 526 //     item from GetSelection())
 527 #define EVT_TREE_KEY_DOWN(id, fn) { wxEVT_COMMAND_TREE_KEY_DOWN, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, NULL },
 528
 529 // GetItem() returns the item being deleted, the associated data (if any) will
 530 // be deleted just after the return of this event handler (if any)
 531 #define EVT_TREE_DELETE_ITEM(id, fn) { wxEVT_COMMAND_TREE_DELETE_ITEM, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
 532
 533 #endif
 534     // _WX_TREECTRL_H_