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