treectrl.h

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        // get first visible item
    wxTreeItemId GetFirstVisibleItem() const;
        // get the next visible item: item must be visible itself!
        // see IsVisible() and wxTreeCtrl::GetFirstVisibleItem()
    wxTreeItemId GetNextVisible(const wxTreeItemId& item) const;
        // get the previous visible item: item must be visible itself!
    wxTreeItemId GetPrevVisible(const wxTreeItemId& item) const;

    // operations
    // ----------

        // add the root node to the tree
    wxTreeItemId AddRoot(const wxString& text,
                         int image = -1, int selectedImage = -1,
                         wxTreeItemData *data = NULL);

        // insert a new item in as the first child of the parent
    wxTreeItemId PrependItem(const wxTreeItemId& parent,
                             const wxString& text,
                             int image = -1, int selectedImage = -1,
                             wxTreeItemData *data = NULL);

        // insert a new item after a given one
    wxTreeItemId InsertItem(const wxTreeItemId& parent,
                            const wxTreeItemId& idPrevious,
                            const wxString& text,
                            int image = -1, int selectedImage = -1,
                            wxTreeItemData *data = NULL);

        // insert a new item before the one with the given index
    wxTreeItemId InsertItem(const wxTreeItemId& parent,
                            size_t index,
                            const wxString& text,
                            int image = -1, int selectedImage = -1,
                            wxTreeItemData *data = NULL);

        // insert a new item in as the last child of the parent
    wxTreeItemId AppendItem(const wxTreeItemId& parent,
                            const wxString& text,
                            int image = -1, int selectedImage = -1,
                            wxTreeItemData *data = NULL);

        // delete this item and associated data if any
    void Delete(const wxTreeItemId& item);
        // delete all children (but don't delete the item itself)
        // NB: this won't send wxEVT_COMMAND_TREE_ITEM_DELETED events
    void DeleteChildren(const wxTreeItemId& item);
        // delete all items from the tree
        // NB: this won't send wxEVT_COMMAND_TREE_ITEM_DELETED events
    void DeleteAllItems();

        // expand this item
    void Expand(const wxTreeItemId& item);
        // collapse the item without removing its children
    void Collapse(const wxTreeItemId& item);
        // collapse the item and remove all children
    void CollapseAndReset(const wxTreeItemId& item);
        // toggles the current state
    void Toggle(const wxTreeItemId& item);

        // remove the selection from currently selected item (if any)
    void Unselect();
        // unselect all items (only makes sense for multiple selection control)
    void UnselectAll();
        // select this item
    void SelectItem(const wxTreeItemId& item, bool select = true);
        // unselect this item
    void UnselectItem(const wxTreeItemId& item);
        // toggle item selection
    void ToggleItemSelection(const wxTreeItemId& item);

        // make sure this item is visible (expanding the parent item and/or
        // scrolling to this item if necessary)
    void EnsureVisible(const wxTreeItemId& item);
        // scroll to this item (but don't expand its parent)
    void ScrollTo(const wxTreeItemId& item);

        // start editing the item label: this (temporarily) replaces the item
        // with a one line edit control. The item will be selected if it hadn't
        // been before. textCtrlClass parameter allows you to create an edit
        // control of arbitrary user-defined class deriving from wxTextCtrl.
    wxTextCtrl* EditLabel(const wxTreeItemId& item,
                          wxClassInfo* textCtrlClass = CLASSINFO(wxTextCtrl));
        // returns the same pointer as StartEdit() if the item is being edited,
        // NULL otherwise (it's assumed that no more than one item may be
        // edited simultaneously)
    wxTextCtrl* GetEditControl() const;
        // end editing and accept or discard the changes to item label
    void EndEditLabel(const wxTreeItemId& item, bool discardChanges = false);

    // sorting
        // this function is called to compare 2 items and should return -1, 0
        // or +1 if the first item is less than, equal to or greater than the
        // second one. The base class version performs alphabetic comparaison
        // of item labels (GetText)
    virtual int OnCompareItems(const wxTreeItemId& item1,
                               const wxTreeItemId& item2);
        // sort the children of this item using OnCompareItems
        //
        // NB: this function is not reentrant and not MT-safe (FIXME)!
    void SortChildren(const wxTreeItemId& item);

    // helpers
    // -------

        // determine to which item (if any) belongs the given point (the
        // coordinates specified are relative to the client area of tree ctrl)
        // and fill the flags parameter with a bitmask of wxTREE_HITTEST_xxx
        // constants.
        //
        // The first function is more portable (because easier to implement
        // on other platforms), but the second one returns some extra info.
    wxTreeItemId HitTest(const wxPoint& point)
        { int dummy; return HitTest(point, dummy); }
    wxTreeItemId HitTest(const wxPoint& point, int& flags);

        // get the bounding rectangle of the item (or of its label only)
    bool GetBoundingRect(const wxTreeItemId& item,
                         wxRect& rect,
                         bool textOnly = false) const;

    // implementation
    // --------------

    virtual bool ShouldInheritColours() const { return false; }

    virtual wxVisualAttributes GetDefaultAttributes() const
    {
        return GetClassDefaultAttributes(GetWindowVariant());
    }

    static wxVisualAttributes
    GetClassDefaultAttributes(wxWindowVariant variant = wxWINDOW_VARIANT_NORMAL);

    // override some base class virtuals
    virtual bool SetBackgroundColour(const wxColour &colour);
    virtual bool SetForegroundColour(const wxColour &colour);

    // get/set the check state for the item (only for wxTR_MULTIPLE)
    bool IsItemChecked(const wxTreeItemId& item) const;
    void SetItemCheck(const wxTreeItemId& item, bool check = true);

    // set/get the item state.image (state == -1 means cycle to the next one)
    void SetState(const wxTreeItemId& node, int state);
    int GetState(const wxTreeItemId& node);

protected:
    // SetImageList helper
    void SetAnyImageList(wxImageList *imageList, int which);

    // refresh a single item
    void RefreshItem(const wxTreeItemId& item);

    wxTextCtrl  *m_textCtrl;        // used while editing the item label
    wxImageList *m_imageListNormal, // images for tree elements
                *m_imageListState;  // special images for app defined states
    bool         m_ownsImageListNormal, m_ownsImageListState;

private:
    // the common part of all ctors
    void Init();

    // helper functions
    inline bool DoGetItem(wxTreeViewItem *tvItem) const;
    inline void DoSetItem(wxTreeViewItem *tvItem);

    inline void DoExpand(const wxTreeItemId& item, int flag);

    wxTreeItemId DoInsertItem(const wxTreeItemId& parent,
                              wxTreeItemId hInsertAfter,
                              const wxString& text,
                              int image, int selectedImage,
                              wxTreeItemData *data);

    int DoGetItemImageFromData(const wxTreeItemId& item,
                               wxTreeItemIcon which) const;
    void DoSetItemImageFromData(const wxTreeItemId& item,
                                int image,
                                wxTreeItemIcon which) const;
    void DoSetItemImages(const wxTreeItemId& item, int image, int imageSel);

    void DeleteTextCtrl();

    // support for additional item images which we implement using
    // wxTreeItemIndirectData technique
    void SetIndirectItemData(const wxTreeItemId& item,
                             class wxTreeItemIndirectData *data);
    bool HasIndirectData(const wxTreeItemId& item) const;
    bool IsDataIndirect(wxTreeItemData *data) const
        { return data && data->GetId().m_pItem == 0; }

    // the hash storing the items attributes (indexed by item ids)
    wxMapTreeAttr m_attrs;

    // true if the hash above is not empty
    bool m_hasAnyAttr;

    // used for dragging
    wxDragImage *m_dragImage;

    // Virtual root item, if wxTR_HIDE_ROOT is set.
    void* m_pVirtualRoot;

    // the starting item for selection with Shift
    wxTreeItemId m_htSelStart;

    friend class wxTreeItemIndirectData;
    friend class wxTreeSortHelper;

    DECLARE_DYNAMIC_CLASS(wxTreeCtrl)
    DECLARE_NO_COPY_CLASS(wxTreeCtrl)
};

#endif // wxUSE_TREECTRL

#endif // _WX_TREECTRL_H_