interface/wx/treectrl.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        treectrl.h
   3 // Purpose:     interface of wxTreeItemData
   4 // Author:      wxWidgets team
   5 // RCS-ID:      $Id$
   6 // Licence:     wxWindows license
   7 /////////////////////////////////////////////////////////////////////////////
   8
   9
  10 /**
  11     @class wxTreeCtrl
  12
  13     A tree control presents information as a hierarchy, with items that may be
  14     expanded to show further items. Items in a tree control are referenced by
  15     wxTreeItemId handles, which may be tested for validity by calling
  16     wxTreeItemId::IsOk().
  17
  18     A similar control with a fully native implemtation for GTK+ and OS X
  19     as well is wxDataViewTreeCtrl.
  20
  21     To intercept events from a tree control, use the event table macros
  22     described in wxTreeEvent.
  23
  24     @beginStyleTable
  25     @style{wxTR_EDIT_LABELS}
  26         Use this style if you wish the user to be able to edit labels in the
  27         tree control.
  28     @style{wxTR_NO_BUTTONS}
  29         For convenience to document that no buttons are to be drawn.
  30     @style{wxTR_HAS_BUTTONS}
  31         Use this style to show + and - buttons to the left of parent items.
  32     @style{wxTR_NO_LINES}
  33         Use this style to hide vertical level connectors.
  34     @style{wxTR_FULL_ROW_HIGHLIGHT}
  35         Use this style to have the background colour and the selection highlight
  36         extend over the entire horizontal row of the tree control window. (This
  37         flag is ignored under Windows unless you specify @c wxTR_NO_LINES as
  38         well.)
  39     @style{wxTR_LINES_AT_ROOT}
  40         Use this style to show lines between root nodes. Only applicable if @c
  41         wxTR_HIDE_ROOT is set and @c wxTR_NO_LINES is not set.
  42     @style{wxTR_HIDE_ROOT}
  43         Use this style to suppress the display of the root node, effectively
  44         causing the first-level nodes to appear as a series of root nodes.
  45     @style{wxTR_ROW_LINES}
  46         Use this style to draw a contrasting border between displayed rows.
  47     @style{wxTR_HAS_VARIABLE_ROW_HEIGHT}
  48         Use this style to cause row heights to be just big enough to fit the
  49         content. If not set, all rows use the largest row height. The default is
  50         that this flag is unset. Generic only.
  51     @style{wxTR_SINGLE}
  52         For convenience to document that only one item may be selected at a
  53         time. Selecting another item causes the current selection, if any, to be
  54         deselected. This is the default.
  55     @style{wxTR_MULTIPLE}
  56         Use this style to allow a range of items to be selected. If a second
  57         range is selected, the current range, if any, is deselected.
  58     @style{wxTR_DEFAULT_STYLE}
  59         The set of flags that are closest to the defaults for the native control
  60         for a particular toolkit.
  61     @endStyleTable
  62
  63     @beginEventTable{wxTreeEvent}
  64     @event{EVT_TREE_BEGIN_DRAG(id, func)}
  65           Begin dragging with the left mouse button.
  66     @event{EVT_TREE_BEGIN_RDRAG(id, func)}
  67           Begin dragging with the right mouse button.
  68     @event{EVT_TREE_END_DRAG(id, func)}
  69           End dragging with the left or right mouse button.
  70     @event{EVT_TREE_BEGIN_LABEL_EDIT(id, func)}
  71           Begin editing a label. This can be prevented by calling Veto().
  72     @event{EVT_TREE_END_LABEL_EDIT(id, func)}
  73           Finish editing a label. This can be prevented by calling Veto().
  74     @event{EVT_TREE_DELETE_ITEM(id, func)}
  75           An item was deleted.
  76     @event{EVT_TREE_GET_INFO(id, func)}
  77           Request information from the application.
  78     @event{EVT_TREE_SET_INFO(id, func)}
  79           Information is being supplied.
  80     @event{EVT_TREE_ITEM_ACTIVATED(id, func)}
  81           The item has been activated, i.e. chosen by double clicking it with mouse or from keyboard.
  82     @event{EVT_TREE_ITEM_COLLAPSED(id, func)}
  83           The item has been collapsed.
  84     @event{EVT_TREE_ITEM_COLLAPSING(id, func)}
  85           The item is being collapsed. This can be prevented by calling Veto().
  86     @event{EVT_TREE_ITEM_EXPANDED(id, func)}
  87           The item has been expanded.
  88     @event{EVT_TREE_ITEM_EXPANDING(id, func)}
  89           The item is being expanded. This can be prevented by calling Veto().
  90     @event{EVT_TREE_ITEM_RIGHT_CLICK(id, func)}
  91           The user has clicked the item with the right mouse button.
  92     @event{EVT_TREE_ITEM_MIDDLE_CLICK(id, func)}
  93           The user has clicked the item with the middle mouse button.
  94     @event{EVT_TREE_SEL_CHANGED(id, func)}
  95           Selection has changed.
  96     @event{EVT_TREE_SEL_CHANGING(id, func)}
  97           Selection is changing. This can be prevented by calling Veto().
  98     @event{EVT_TREE_KEY_DOWN(id, func)}
  99           A key has been pressed.
 100     @event{EVT_TREE_ITEM_GETTOOLTIP(id, func)}
 101           The opportunity to set the item tooltip is being given to the application (call wxTreeEvent::SetToolTip). Windows only.
 102     @event{EVT_TREE_ITEM_MENU(id, func)}
 103           The context menu for the selected item has been requested, either by a right click or by using the menu key.
 104     @event{EVT_TREE_STATE_IMAGE_CLICK(id, func)}
 105           The state image has been clicked. Windows only.
 106     @endEventTable
 107
 108
 109     See also @ref overview_windowstyles.
 110
 111     @b Win32 @b notes:
 112
 113     wxTreeCtrl class uses the standard common treeview control under Win32
 114     implemented in the system library comctl32.dll. Some versions of this
 115     library are known to have bugs with handling the tree control colours: the
 116     usual symptom is that the expanded items leave black (or otherwise
 117     incorrectly coloured) background behind them, especially for the controls
 118     using non-default background colour. The recommended solution is to upgrade
 119     the comctl32.dll to a newer version: see
 120     http://www.microsoft.com/downloads/details.aspx?familyid=cb2cf3a2-8025-4e8f-8511-9b476a8d35d2
 121
 122     @library{wxcore}
 123     @category{ctrl}
 124     <!-- @appearance{treectrl.png} -->
 125
 126     @see wxDataViewTreeCtrl, wxTreeEvent, wxTreeItemData, @ref overview_treectrl, wxListBox,
 127          wxListCtrl, wxImageList
 128 */
 129 class wxTreeCtrl : public wxControl
 130 {
 131 public:
 132     /**
 133         Default Constructor.
 134     */
 135     wxTreeCtrl();
 136
 137     /**
 138         Constructor, creating and showing a tree control.
 139
 140         @param parent
 141             Parent window. Must not be @NULL.
 142         @param id
 143             Window identifier. The value @c wxID_ANY indicates a default value.
 144         @param pos
 145             Window position.
 146         @param size
 147             Window size. If wxDefaultSize is specified then the window is sized
 148             appropriately.
 149         @param style
 150             Window style. See wxTreeCtrl.
 151         @param validator
 152             Window validator.
 153         @param name
 154             Window name.
 155
 156         @see Create(), wxValidator
 157     */
 158     wxTreeCtrl(wxWindow* parent, wxWindowID id,
 159                const wxPoint& pos = wxDefaultPosition,
 160                const wxSize& size = wxDefaultSize,
 161                long style = wxTR_HAS_BUTTONS,
 162                const wxValidator& validator = wxDefaultValidator,
 163                const wxString& name = "treeCtrl");
 164
 165
 166     /**
 167         Destructor, destroying the tree control.
 168     */
 169     ~wxTreeCtrl();
 170
 171     /**
 172         Adds the root node to the tree, returning the new item.
 173
 174         The @a image and @a selImage parameters are an index within the normal
 175         image list specifying the image to use for unselected and selected
 176         items, respectively. If @a image -1 and @a selImage is -1, the same
 177         image is used for both selected and unselected items.
 178     */
 179     wxTreeItemId AddRoot(const wxString& text, int image = -1,
 180                          int selImage = -1,
 181                          wxTreeItemData* data = NULL);
 182
 183     /**
 184         Appends an item to the end of the branch identified by @a parent, return
 185         a new item id.
 186
 187         The @a image and @a selImage parameters are an index within the normal
 188         image list specifying the image to use for unselected and selected
 189         items, respectively. If @a image -1 and @a selImage is -1, the same
 190         image is used for both selected and unselected items.
 191     */
 192     wxTreeItemId AppendItem(const wxTreeItemId& parent,
 193                             const wxString& text,
 194                             int image = -1,
 195                             int selImage = -1,
 196                             wxTreeItemData* data = NULL);
 197
 198     /**
 199         Sets the buttons image list. The button images assigned with this method
 200         will be automatically deleted by wxTreeCtrl as appropriate (i.e. it
 201         takes ownership of the list).
 202
 203         Setting or assigning the button image list enables the display of image
 204         buttons. Once enabled, the only way to disable the display of button
 205         images is to set the button image list to @NULL.
 206
 207         This function is only available in the generic version.
 208
 209         @see SetButtonsImageList().
 210     */
 211     void AssignButtonsImageList(wxImageList* imageList);
 212
 213     /**
 214         Sets the normal image list. The image list assigned with this method
 215         will be automatically deleted by wxTreeCtrl as appropriate (i.e. it
 216         takes ownership of the list).
 217
 218         @see SetImageList().
 219     */
 220     void AssignImageList(wxImageList* imageList);
 221
 222     /**
 223         Sets the state image list. Image list assigned with this method will be
 224         automatically deleted by wxTreeCtrl as appropriate (i.e. it takes
 225         ownership of the list).
 226
 227         @see SetStateImageList().
 228     */
 229     void AssignStateImageList(wxImageList* imageList);
 230
 231     /**
 232         Collapses the given item.
 233     */
 234     void Collapse(const wxTreeItemId& item);
 235
 236     /**
 237         Collapses the root item.
 238
 239         @see ExpandAll()
 240     */
 241     void CollapseAll();
 242
 243     /**
 244         Collapses this item and all of its children, recursively.
 245
 246         @see ExpandAllChildren()
 247     */
 248     void CollapseAllChildren(const wxTreeItemId& item);
 249
 250     /**
 251         Collapses the given item and removes all children.
 252     */
 253     void CollapseAndReset(const wxTreeItemId& item);
 254
 255     /**
 256         Creates the tree control. See wxTreeCtrl::wxTreeCtrl() for further
 257         details.
 258     */
 259     bool Create(wxWindow* parent, wxWindowID id,
 260                 const wxPoint& pos = wxDefaultPosition,
 261                 const wxSize& size = wxDefaultSize,
 262                 long style = wxTR_HAS_BUTTONS,
 263                 const wxValidator& validator = wxDefaultValidator,
 264                 const wxString& name = "treeCtrl");
 265
 266     /**
 267         Deletes the specified item. A EVT_TREE_DELETE_ITEM() event will be
 268         generated.
 269
 270         This function may cause a subsequent call to GetNextChild() to fail.
 271     */
 272     void Delete(const wxTreeItemId& item);
 273
 274     /**
 275         Deletes all items in the control. Note that this may not generate
 276         EVT_TREE_DELETE_ITEM() events under some Windows versions although
 277         normally such event is generated for each removed item.
 278     */
 279     void DeleteAllItems();
 280
 281     /**
 282         Deletes all children of the given item (but not the item itself). Note
 283         that this will @b not generate any events unlike Delete() method.
 284
 285         If you have called SetItemHasChildren(), you may need to call it again
 286         since DeleteChildren() does not automatically clear the setting.
 287     */
 288     void DeleteChildren(const wxTreeItemId& item);
 289
 290     /**
 291         Starts editing the label of the given @a item. This function generates a
 292         EVT_TREE_BEGIN_LABEL_EDIT() event which can be vetoed so that no text
 293         control will appear for in-place editing.
 294
 295         If the user changed the label (i.e. s/he does not press ESC or leave the
 296         text control without changes, a EVT_TREE_END_LABEL_EDIT() event will be
 297         sent which can be vetoed as well.
 298
 299         @see EndEditLabel(), wxTreeEvent
 300     */
 301     void EditLabel(const wxTreeItemId& item);
 302
 303     /**
 304         Ends label editing. If @a cancelEdit is @true, the edit will be
 305         cancelled.
 306
 307         @note
 308             This function is currently supported under Windows only.
 309
 310         @see EditLabel()
 311     */
 312     void EndEditLabel(bool cancelEdit);
 313
 314     /**
 315         Scrolls and/or expands items to ensure that the given item is visible.
 316     */
 317     void EnsureVisible(const wxTreeItemId& item);
 318
 319     /**
 320         Expands the given item.
 321     */
 322     void Expand(const wxTreeItemId& item);
 323
 324     /**
 325         Expands all items in the tree.
 326     */
 327     void ExpandAll();
 328
 329     /**
 330         Expands the given item and all its children recursively.
 331     */
 332     void ExpandAllChildren(const wxTreeItemId& item);
 333
 334     /**
 335         Retrieves the rectangle bounding the @a item. If @a textOnly is @true,
 336         only the rectangle around the item's label will be returned, otherwise
 337         the item's image is also taken into account.
 338
 339         The return value is @true if the rectangle was successfully retrieved or
 340         @c @false if it was not (in this case @a rect is not changed) -- for
 341         example, if the item is currently invisible.
 342
 343         Notice that the rectangle coordinates are logical, not physical ones.
 344         So, for example, the x coordinate may be negative if the tree has a
 345         horizontal scrollbar and its position is not 0.
 346
 347         @beginWxPythonOnly
 348         The wxPython version of this method requires only the @a item and @a
 349         textOnly parameters. The return value is either a wxRect object or @c
 350         None.
 351         @endWxPythonOnly
 352     */
 353     bool GetBoundingRect(const wxTreeItemId& item, wxRect& rect,
 354                          bool textOnly = false) const;
 355
 356     /**
 357         Returns the buttons image list (from which application-defined button
 358         images are taken).
 359
 360         This function is only available in the generic version.
 361     */
 362     wxImageList* GetButtonsImageList() const;
 363
 364     /**
 365         Returns the number of items in the branch. If @a recursively is @true,
 366         returns the total number of descendants, otherwise only one level of
 367         children is counted.
 368     */
 369     unsigned int GetChildrenCount(const wxTreeItemId& item,
 370                                   bool recursively = true) const;
 371
 372     /**
 373         Returns the number of items in the control.
 374     */
 375     unsigned int GetCount() const;
 376
 377     /**
 378         Returns the edit control being currently used to edit a label. Returns
 379         @NULL if no label is being edited.
 380
 381         @note This is currently only implemented for wxMSW.
 382     */
 383     wxTextCtrl* GetEditControl() const;
 384
 385     /**
 386         Returns the first child; call GetNextChild() for the next child.
 387
 388         For this enumeration function you must pass in a 'cookie' parameter
 389         which is opaque for the application but is necessary for the library to
 390         make these functions reentrant (i.e. allow more than one enumeration on
 391         one and the same object simultaneously). The cookie passed to
 392         GetFirstChild() and GetNextChild() should be the same variable.
 393
 394         Returns an invalid tree item (i.e. wxTreeItemId::IsOk() returns @false)
 395         if there are no further children.
 396
 397         @beginWxPythonOnly
 398         In wxPython the returned wxTreeItemId and the new cookie value are both
 399         returned as a tuple containing the two values.
 400         @endWxPythonOnly
 401
 402         @see GetNextChild(), GetNextSibling()
 403     */
 404     wxTreeItemId GetFirstChild(const wxTreeItemId& item,
 405                                wxTreeItemIdValue& cookie) const;
 406
 407     /**
 408         Returns the first visible item.
 409     */
 410     wxTreeItemId GetFirstVisibleItem() const;
 411
 412     /**
 413         Returns the normal image list.
 414     */
 415     wxImageList* GetImageList() const;
 416
 417     /**
 418         Returns the current tree control indentation.
 419     */
 420     int GetIndent() const;
 421
 422     /**
 423         Returns the background colour of the item.
 424     */
 425     wxColour GetItemBackgroundColour(const wxTreeItemId& item) const;
 426
 427     /**
 428         Returns the tree item data associated with the item.
 429
 430         @see wxTreeItemData
 431
 432         @beginWxPythonOnly
 433         wxPython provides the following shortcut method:
 434         @li GetPyData(item): Returns the Python Object associated with the
 435             wxTreeItemData for the given item Id.
 436         @endWxPythonOnly
 437     */
 438     wxTreeItemData* GetItemData(const wxTreeItemId& item) const;
 439
 440     /**
 441         Returns the font of the item label.
 442     */
 443     wxFont GetItemFont(const wxTreeItemId& item) const;
 444
 445     /**
 446         Gets the specified item image. The value of @a which may be:
 447         - ::wxTreeItemIcon_Normal: to get the normal item image.
 448         - ::wxTreeItemIcon_Selected: to get the selected item image (i.e. the
 449             image which is shown when the item is currently selected).
 450         - ::wxTreeItemIcon_Expanded: to get the expanded image (this only makes
 451             sense for items which have children - then this image is shown when
 452             the item is expanded and the normal image is shown when it is
 453             collapsed).
 454         - ::wxTreeItemIcon_SelectedExpanded: to get the selected expanded image
 455             (which is shown when an expanded item is currently selected).
 456     */
 457     int GetItemImage(const wxTreeItemId& item,
 458                      wxTreeItemIcon which = wxTreeItemIcon_Normal) const;
 459
 460     /**
 461         Returns the item's parent.
 462     */
 463     wxTreeItemId GetItemParent(const wxTreeItemId& item) const;
 464
 465     /**
 466         Gets the selected item image (this function is obsolete, use @ref
 467         GetItemImage() "GetItemImage"( @a item, ::wxTreeItemIcon_Selected)
 468         instead).
 469     */
 470     int GetItemSelectedImage(const wxTreeItemId& item) const;
 471
 472     /**
 473         Gets the specified item state.
 474     */
 475     int GetItemState(const wxTreeItemId& item) const;
 476
 477     /**
 478         Returns the item label.
 479     */
 480     wxString GetItemText(const wxTreeItemId& item) const;
 481
 482     /**
 483         Returns the colour of the item label.
 484     */
 485     wxColour GetItemTextColour(const wxTreeItemId& item) const;
 486
 487     /**
 488         Returns the last child of the item (or an invalid tree item if this item
 489         has no children).
 490
 491         @see GetFirstChild(), GetNextSibling(), GetLastChild()
 492     */
 493     wxTreeItemId GetLastChild(const wxTreeItemId& item) const;
 494
 495     /**
 496         Returns the next child; call GetFirstChild() for the first child. For
 497         this enumeration function you must pass in a 'cookie' parameter which is
 498         opaque for the application but is necessary for the library to make
 499         these functions reentrant (i.e. allow more than one enumeration on one
 500         and the same object simultaneously). The cookie passed to
 501         GetFirstChild() and GetNextChild() should be the same.
 502
 503         Returns an invalid tree item if there are no further children.
 504
 505         @beginWxPythonOnly
 506         In wxPython the returned wxTreeItemId and the new cookie value are both
 507         returned as a tuple containing the two values.
 508         @endWxPythonOnly
 509
 510         @see GetFirstChild()
 511     */
 512     wxTreeItemId GetNextChild(const wxTreeItemId& item,
 513                               wxTreeItemIdValue& cookie) const;
 514
 515     /**
 516         Returns the next sibling of the specified item; call GetPrevSibling()
 517         for the previous sibling.
 518
 519         Returns an invalid tree item if there are no further siblings.
 520
 521         @see GetPrevSibling()
 522     */
 523     wxTreeItemId GetNextSibling(const wxTreeItemId& item) const;
 524
 525     /**
 526         Returns the next visible item or an invalid item if this item is the
 527         last visible one.
 528
 529         @note The @a item itself must be visible.
 530     */
 531     wxTreeItemId GetNextVisible(const wxTreeItemId& item) const;
 532
 533     /**
 534         Returns the previous sibling of the specified item; call
 535         GetNextSibling() for the next sibling.
 536
 537         Returns an invalid tree item if there are no further children.
 538
 539         @see GetNextSibling()
 540     */
 541     wxTreeItemId GetPrevSibling(const wxTreeItemId& item) const;
 542
 543     /**
 544         Returns the previous visible item or an invalid item if this item is the
 545         first visible one.
 546
 547         @note The @a item itself must be visible.
 548     */
 549     wxTreeItemId GetPrevVisible(const wxTreeItemId& item) const;
 550
 551     /**
 552         Returns @true if the control will use a quick calculation for the best
 553         size, looking only at the first and last items. The default is @false.
 554
 555         @see SetQuickBestSize()
 556     */
 557     bool GetQuickBestSize() const;
 558
 559     /**
 560         Returns the root item for the tree control.
 561     */
 562     wxTreeItemId GetRootItem() const;
 563
 564     /**
 565         Returns the selection, or an invalid item if there is no selection. This
 566         function only works with the controls without @c wxTR_MULTIPLE style,
 567         use GetSelections() for the controls which do have this style.
 568     */
 569     wxTreeItemId GetSelection() const;
 570
 571     /**
 572         Fills the array of tree items passed in with the currently selected
 573         items. This function can be called only if the control has the @c
 574         wxTR_MULTIPLE style.
 575
 576         Returns the number of selected items.
 577
 578         @beginWxPythonOnly
 579         The wxPython version of this method accepts no parameters and returns a
 580         Python list of @ref wxTreeItemId "wxTreeItemId"s.
 581         @endWxPythonOnly
 582     */
 583     unsigned int GetSelections(wxArrayTreeItemIds& selection) const;
 584
 585     /**
 586         Returns the state image list (from which application-defined state
 587         images are taken).
 588     */
 589     wxImageList* GetStateImageList() const;
 590
 591     /**
 592         Calculates which (if any) item is under the given @a point, returning
 593         the tree item id at this point plus extra information @a flags. @a flags
 594         is a bitlist of the following:
 595
 596         - @c wxTREE_HITTEST_ABOVE: Above the client area.
 597         - @c wxTREE_HITTEST_BELOW: Below the client area.
 598         - @c wxTREE_HITTEST_NOWHERE: In the client area but below the last item.
 599         - @c wxTREE_HITTEST_ONITEMBUTTON: On the button associated with an item.
 600         - @c wxTREE_HITTEST_ONITEMICON: On the bitmap associated with an item.
 601         - @c wxTREE_HITTEST_ONITEMINDENT: In the indentation associated with an
 602             item.
 603         - @c wxTREE_HITTEST_ONITEMLABEL: On the label (string) associated with
 604             an item.
 605         - @c wxTREE_HITTEST_ONITEMRIGHT: In the area to the right of an item.
 606         - @c wxTREE_HITTEST_ONITEMSTATEICON: On the state icon for a tree view
 607             item that is in a user-defined state.
 608         - @c wxTREE_HITTEST_TOLEFT: To the right of the client area.
 609         - @c wxTREE_HITTEST_TORIGHT: To the left of the client area.
 610
 611         @beginWxPythonOnly
 612         In wxPython both the wxTreeItemId and the flags are returned as a tuple.
 613         @endWxPythonOnly
 614     */
 615     wxTreeItemId HitTest(const wxPoint& point, int& flags) const;
 616
 617
 618     /**
 619         Inserts an item after a given one (@a previous).
 620
 621         The @a image and @a selImage parameters are an index within the normal
 622         image list specifying the image to use for unselected and selected
 623         items, respectively. If @a image -1 and @a selImage is -1, the same
 624         image is used for both selected and unselected items.
 625     */
 626     wxTreeItemId InsertItem(const wxTreeItemId& parent,
 627                             const wxTreeItemId& previous,
 628                             const wxString& text,
 629                             int image = -1,
 630                             int selImage = -1,
 631                             wxTreeItemData* data = NULL);
 632
 633     /**
 634         Inserts an item before one identified
 635         by its position (@a before). @a before must be less than the number of
 636         children.
 637
 638         The @a image and @a selImage parameters are an index within the normal
 639         image list specifying the image to use for unselected and selected
 640         items, respectively. If @a image -1 and @a selImage is -1, the same
 641         image is used for both selected and unselected items.
 642
 643         @beginWxPythonOnly
 644         In wxPython, this form of this method is called @c InsertItemBefore().
 645         @endWxPythonOnly
 646     */
 647     wxTreeItemId InsertItem(const wxTreeItemId& parent,
 648                             size_t before,
 649                             const wxString& text,
 650                             int image = -1,
 651                             int selImage = -1,
 652                             wxTreeItemData* data = NULL);
 653
 654     /**
 655         Returns @true if the given item is in bold state.
 656
 657         @see SetItemBold()
 658     */
 659     bool IsBold(const wxTreeItemId& item) const;
 660
 661     /**
 662         Returns @true if the control is empty (i.e. has no items, even no root
 663         one).
 664     */
 665     bool IsEmpty() const;
 666
 667     /**
 668         Returns @true if the item is expanded (only makes sense if it has
 669         children).
 670     */
 671     bool IsExpanded(const wxTreeItemId& item) const;
 672
 673     /**
 674         Returns @true if the item is selected.
 675     */
 676     bool IsSelected(const wxTreeItemId& item) const;
 677
 678     /**
 679         Returns @true if the item is visible on the screen.
 680     */
 681     bool IsVisible(const wxTreeItemId& item) const;
 682
 683     /**
 684         Returns @true if the item has children.
 685     */
 686     bool ItemHasChildren(const wxTreeItemId& item) const;
 687
 688     /**
 689         Override this function in the derived class to change the sort order of
 690         the items in the tree control. The function should return a negative,
 691         zero or positive value if the first item is less than, equal to or
 692         greater than the second one.
 693
 694         Please note that you @b must use wxRTTI macros DECLARE_DYNAMIC_CLASS()
 695         and IMPLEMENT_DYNAMIC_CLASS() if you override this function because
 696         otherwise the base class considers that it is not overridden and uses
 697         the default comparison, i.e. sorts the items alphabetically, which
 698         allows it optimize away the calls to the virtual function completely.
 699
 700         @see SortChildren()
 701     */
 702     int OnCompareItems(const wxTreeItemId& item1,
 703                        const wxTreeItemId& item2);
 704
 705     /**
 706         Appends an item as the first child of @a parent, return a new item id.
 707
 708         The @a image and @a selImage parameters are an index within the normal
 709         image list specifying the image to use for unselected and selected
 710         items, respectively. If @a image -1 and @a selImage is -1, the same
 711         image is used for both selected and unselected items.
 712     */
 713     wxTreeItemId PrependItem(const wxTreeItemId& parent,
 714                              const wxString& text,
 715                              int image = -1,
 716                              int selImage = -1,
 717                              wxTreeItemData* data = NULL);
 718
 719     /**
 720         Scrolls the specified item into view.
 721     */
 722     void ScrollTo(const wxTreeItemId& item);
 723
 724     /**
 725         Selects the given item. In multiple selection controls, can be also used
 726         to deselect a currently selected item if the value of @a select is
 727         @false.
 728     */
 729     void SelectItem(const wxTreeItemId& item, bool select = true);
 730
 731     /**
 732         Sets the buttons image list (from which application-defined button
 733         images are taken).
 734
 735         The button images assigned with this method will @b not be deleted by
 736         @ref wxTreeCtrl "wxTreeCtrl"'s destructor, you must delete it yourself.
 737         Setting or assigning the button image list enables the display of image
 738         buttons. Once enabled, the only way to disable the display of button
 739         images is to set the button image list to @NULL.
 740
 741         @note This function is only available in the generic version.
 742
 743         @see AssignButtonsImageList().
 744     */
 745     void SetButtonsImageList(wxImageList* imageList);
 746
 747     /**
 748         Sets the normal image list. The image list assigned with this method
 749         will @b not be deleted by @ref wxTreeCtrl "wxTreeCtrl"'s destructor, you
 750         must delete it yourself.
 751
 752         @see AssignImageList().
 753     */
 754     void SetImageList(wxImageList* imageList);
 755
 756     /**
 757         Sets the indentation for the tree control.
 758     */
 759     void SetIndent(int indent);
 760
 761     /**
 762         Sets the colour of the item's background.
 763     */
 764     void SetItemBackgroundColour(const wxTreeItemId& item,
 765                                  const wxColour& col);
 766
 767     /**
 768         Makes item appear in bold font if @a bold parameter is @true or resets
 769         it to the normal state.
 770
 771         @see IsBold()
 772     */
 773     void SetItemBold(const wxTreeItemId& item, bool bold = true);
 774
 775     /**
 776         Sets the item client data.
 777
 778         @beginWxPythonOnly
 779         - @b SetPyData( @a item, @c obj): Associate the given Python Object with
 780             the wxTreeItemData for the given item Id.
 781         @endWxPythonOnly
 782
 783     */
 784     void SetItemData(const wxTreeItemId& item, wxTreeItemData* data);
 785
 786
 787     /**
 788         Gives the item the visual feedback for Drag'n'Drop actions, which is
 789         useful if something is dragged from the outside onto the tree control
 790         (as opposed to a DnD operation within the tree control, which already
 791         is implemented internally).
 792     */
 793     void SetItemDropHighlight(const wxTreeItemId& item,
 794                               bool highlight = true);
 795
 796     /**
 797         Sets the item's font. All items in the tree should have the same height
 798         to avoid text clipping, so the fonts height should be the same for all
 799         of them, although font attributes may vary.
 800
 801         @see SetItemBold()
 802     */
 803     void SetItemFont(const wxTreeItemId& item, const wxFont& font);
 804
 805     /**
 806         Force appearance of the button next to the item. This is useful to
 807         allow the user to expand the items which don't have any children now,
 808         but instead adding them only when needed, thus minimizing memory
 809         usage and loading time.
 810     */
 811     void SetItemHasChildren(const wxTreeItemId& item,
 812                             bool hasChildren = true);
 813
 814     /**
 815         Sets the specified item's image. See GetItemImage() for the description
 816         of the @a which parameter.
 817     */
 818     void SetItemImage(const wxTreeItemId& item, int image,
 819                       wxTreeItemIcon which = wxTreeItemIcon_Normal);
 820
 821     /**
 822         Sets the selected item image (this function is obsolete, use @ref
 823         SetItemImage() "SetItemImage"( @a item, ::wxTreeItemIcon_Selected )
 824         instead).
 825     */
 826     void SetItemSelectedImage(const wxTreeItemId& item, int selImage);
 827
 828     /**
 829         Sets the specified item state. The value of @a state may be:
 830         - @c wxTREE_ITEMSTATE_NONE: to disable the item state (the state image will
 831             be not displayed).
 832         - @c wxTREE_ITEMSTATE_NEXT: to set the next item state.
 833         - @c wxTREE_ITEMSTATE_PREV: to set the previous item state.
 834     */
 835     void SetItemState(const wxTreeItemId& item, int state);
 836
 837     /**
 838         Sets the item label.
 839     */
 840     void SetItemText(const wxTreeItemId& item, const wxString& text);
 841
 842     /**
 843         Sets the colour of the item's text.
 844     */
 845     void SetItemTextColour(const wxTreeItemId& item,
 846                            const wxColour& col);
 847
 848     /**
 849         If @true is passed, specifies that the control will use a quick
 850         calculation for the best size, looking only at the first and last items.
 851         Otherwise, it will look at all items. The default is @false.
 852
 853         @see GetQuickBestSize()
 854     */
 855     void SetQuickBestSize(bool quickBestSize);
 856
 857     /**
 858         Sets the state image list (from which application-defined state images
 859         are taken). Image list assigned with this method will @b not be deleted
 860         by @ref wxTreeCtrl "wxTreeCtrl"'s destructor, you must delete it
 861         yourself.
 862
 863         @see AssignStateImageList().
 864     */
 865     void SetStateImageList(wxImageList* imageList);
 866
 867     /**
 868         Sets the mode flags associated with the display of the tree control. The
 869         new mode takes effect immediately.
 870
 871         @note Generic only; MSW ignores changes.
 872     */
 873     void SetWindowStyle(long styles);
 874
 875     /**
 876         Sorts the children of the given item using OnCompareItems().
 877         You should override that method to change the sort order (the default is
 878         ascending case-sensitive alphabetical order).
 879
 880         @see wxTreeItemData, OnCompareItems()
 881     */
 882     void SortChildren(const wxTreeItemId& item);
 883
 884     /**
 885         Toggles the given item between collapsed and expanded states.
 886     */
 887     void Toggle(const wxTreeItemId& item);
 888
 889     /**
 890         Toggles the given item between selected and unselected states. For
 891         multiselection controls only.
 892     */
 893     void ToggleItemSelection(const wxTreeItemId& item);
 894
 895     /**
 896         Removes the selection from the currently selected item (if any).
 897     */
 898     void Unselect();
 899
 900     /**
 901         This function either behaves the same as Unselect() if the control
 902         doesn't have @c wxTR_MULTIPLE style, or removes the selection from all
 903         items if it does have this style.
 904     */
 905     void UnselectAll();
 906
 907     /**
 908         Unselects the given item. This works in multiselection controls only.
 909     */
 910     void UnselectItem(const wxTreeItemId& item);
 911 };
 912
 913
 914
 915 /**
 916     @class wxTreeEvent
 917
 918     A tree event holds information about events associated with wxTreeCtrl
 919     objects.
 920
 921     To process input from a tree control, use these event handler macros to
 922     direct input to member functions that take a wxTreeEvent argument.
 923
 924     @beginEventTable{wxTreeEvent}
 925     @event{EVT_TREE_BEGIN_DRAG(id, func)}
 926         Begin dragging with the left mouse button.
 927     @event{EVT_TREE_BEGIN_RDRAG(id, func)}
 928         Begin dragging with the right mouse button.
 929     @event{EVT_TREE_END_DRAG(id, func)}
 930         End dragging with the left or right mouse button.
 931     @event{EVT_TREE_BEGIN_LABEL_EDIT(id, func)}
 932         Begin editing a label. This can be prevented by calling Veto().
 933     @event{EVT_TREE_END_LABEL_EDIT(id, func)}
 934         Finish editing a label. This can be prevented by calling Veto().
 935     @event{EVT_TREE_DELETE_ITEM(id, func)}
 936         Delete an item.
 937     @event{EVT_TREE_GET_INFO(id, func)}
 938         Request information from the application.
 939     @event{EVT_TREE_SET_INFO(id, func)}
 940         Information is being supplied.
 941     @event{EVT_TREE_ITEM_ACTIVATED(id, func)}
 942         The item has been activated, i.e. chosen by double clicking it with
 943         mouse or from keyboard.
 944     @event{EVT_TREE_ITEM_COLLAPSED(id, func)}
 945         The item has been collapsed.
 946     @event{EVT_TREE_ITEM_COLLAPSING(id, func)}
 947         The item is being collapsed. This can be prevented by calling Veto().
 948     @event{EVT_TREE_ITEM_EXPANDED(id, func)}
 949         The item has been expanded.
 950     @event{EVT_TREE_ITEM_EXPANDING(id, func)}
 951         The item is being expanded. This can be prevented by calling Veto().
 952     @event{EVT_TREE_ITEM_RIGHT_CLICK(id, func)}
 953         The user has clicked the item with the right mouse button.
 954     @event{EVT_TREE_ITEM_MIDDLE_CLICK(id, func)}
 955         The user has clicked the item with the middle mouse button.
 956     @event{EVT_TREE_SEL_CHANGED(id, func)}
 957         Selection has changed.
 958     @event{EVT_TREE_SEL_CHANGING(id, func)}
 959         Selection is changing. This can be prevented by calling Veto().
 960     @event{EVT_TREE_KEY_DOWN(id, func)}
 961         A key has been pressed.
 962     @event{EVT_TREE_ITEM_GETTOOLTIP(id, func)}
 963         The opportunity to set the item tooltip is being given to the
 964         application (call SetToolTip()). Windows only.
 965     @event{EVT_TREE_ITEM_MENU(id, func)}
 966         The context menu for the selected item has been requested, either by a
 967         right click or by using the menu key.
 968     @event{EVT_TREE_STATE_IMAGE_CLICK(id, func)}
 969         The state image has been clicked.
 970     @endEventTable
 971
 972     @library{wxbase}
 973     @category{events}
 974
 975     @see wxTreeCtrl
 976 */
 977 class wxTreeEvent : public wxNotifyEvent
 978 {
 979 public:
 980     /**
 981         Constructor, used by wxWidgets itself only.
 982     */
 983     wxTreeEvent(wxEventType commandType, wxTreeCtrl* tree);
 984
 985     /**
 986         Returns the item (valid for all events).
 987     */
 988     wxTreeItemId GetItem() const;
 989
 990     /**
 991         Returns the key code if the event is a key event. Use GetKeyEvent() to
 992         get the values of the modifier keys for this event (i.e. Shift or Ctrl).
 993     */
 994     int GetKeyCode() const;
 995
 996     /**
 997         Returns the key event for EVT_TREE_KEY_DOWN() events.
 998     */
 999     const wxKeyEvent GetKeyEvent() const;
1000
1001     /**
1002         Returns the label if the event is a begin or end edit label event.
1003     */
1004     const wxString GetLabel() const;
1005
1006     /**
1007         Returns the old item index (valid for EVT_TREE_ITEM_CHANGING() and
1008         EVT_TREE_ITEM_CHANGED() events).
1009     */
1010     wxTreeItemId GetOldItem() const;
1011
1012     /**
1013         Returns the position of the mouse pointer if the event is a drag or
1014         menu-context event.
1015
1016         In both cases the position is in client coordinates - i.e. relative to
1017         the wxTreeCtrl window (so that you can pass it directly to e.g.
1018         wxWindow::PopupMenu()).
1019     */
1020     wxPoint GetPoint() const;
1021
1022     /**
1023         Returns @true if the label edit was cancelled. This should be called
1024         from within an EVT_TREE_END_LABEL_EDIT() handler.
1025     */
1026     bool IsEditCancelled() const;
1027
1028     /**
1029         Set the tooltip for the item (valid for EVT_TREE_ITEM_GETTOOLTIP()
1030         events). Windows only.
1031     */
1032     void SetToolTip(const wxString& tooltip);
1033 };