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# Package Gtk.Tree

Note that this widget is obsolete. Consider using Gtk.Ctree instead.

This widget displays a tree with expandable nodes. A tree is used to display hierarchically-organized data. It is a vertical container for arbitrary widgets of type Gtk_Tree_Item. The difference with a Gtk_Clist is that Gtk_Tree widgets can be nested within other Gtk_Tree widgets.

See also Gtk_Ctree for a columned tree which is also more efficient.

- Gtk.Tree Widget Hierarchy
- Gtk.Tree Subprograms

## Widget Hierarchy

    Gtk_Object                    (see section Package Gtk.Object)
       \___ Gtk_Widget            (see section Package Gtk.Widget)
          \___ Gtk_Container      (see section Package Gtk.Container)
             \___ Gtk_Tree        (see section Package Gtk.Tree)

## Subprograms

### Creation, insertion, deletion
Elements inside a Gtk_Tree are not ordered from the top to the bottom as is the case for Gtk_List. Instead, they are put in the tree by indicating where in the tree they should be placed. The position of an element (called a node) is defined by a parent node and a sibling node. The node will be attached in the parent subtree, on top of the sibling node. Like the Gtk_List widget, a Gtk_Tree will simply keep growing as more items are added to it, as well as when subtrees are expanded. For this reason, they are almost always packed into a Gtk_Scrolled_Window. You might want to use Gtk.Widget.Set_Usize on the scrolled window to ensure that it is big enough to see the tree's items, as the default size for Gtk_Scrolled_Window is quite small.
    procedure Gtk_New
      (Widget             : out    Gtk_Tree);
| Create an empty tree.
    function Get_Type              return Gtk.Gtk_Type;
| Return the internal value associated with a Gtk_Tree.
    procedure Append
      (Tree               : access Gtk_Tree_Record;
       Tree_Item          : access Gtk.Widget.Gtk_Widget_Record'Class);
| Append a tree item to a Tree. See package Gtk.Tree_Item for creating tree items and setting them as subtree. Remember to do Gtk.Widget.Show on the tree item after you append or insert items (can be done any time), otherwise they will not be shown if the user expands them for example.
    function Child_Position
      (Tree               : access Gtk_Tree_Record;
       Child              : access Gtk.Widget.Gtk_Widget_Record'Class)
       return Gint;
| Return the position in the tree of Child. If Child is not in the tree, return -1.
    procedure Clear_Items
      (Tree               : access Gtk_Tree_Record;
       Start              : in     Gint;
       The_End            : in     Gint);
| Remove the items from position Start to position The_End from the tree. The warning about dereferencing at Remove_Items applies here too, as Clear_Items simply constructs a list and passes it to Remove_Items.
    function Get_Children
      (Widget             : access Gtk.Tree.Gtk_Tree_Record)
       return Widget_List.Glist;
| Get the child items of the tree node.
    function Get_Selection
      (Widget             : access Gtk.Tree.Gtk_Tree_Record)
       return Widget_List.Glist;
| Get the current selection of items in the tree.
    procedure Insert
      (Tree               : access Gtk_Tree_Record;
       Tree_Item          : access Gtk.Widget.Gtk_Widget_Record'Class;
       Position           : in     Gint);
| Insert a tree item into a tree at the given position.
    procedure Prepend
      (Tree               : access Gtk_Tree_Record;
       Tree_Item          : access Gtk.Widget.Gtk_Widget_Record'Class);
| Prepend a tree item to a tree.
    procedure Remove_Items
      (Tree               : access Gtk_Tree_Record;
       Items              : in     Widget_List.Glist);
| Remove a list of items (in the form of a Glist) from the tree. Note that removing an item from a tree dereferences (and thus usually) destroys it and its subtree, if it has one, and all subtrees in that subtree. If you want to remove only one item, you can use Gtk.Container.Remove.
    procedure Select_Child
      (Tree               : access Gtk_Tree_Record;
       Tree_Item          : access Gtk.Widget.Gtk_Widget_Record'Class);
| Emit the select_item signal for the child Tree_Item, thus selecting it.
    procedure Select_Item
      (Tree               : access Gtk_Tree_Record;
       Item               : in     Gint);
| Emit the select_item signal for the child at position Item. As a result, the child be is selected (unless you unselect it in a signal handler).
    procedure Set_Selection_Mode
      (Tree               : access Gtk_Tree_Record;
       Mode               : in     Gtk_Selection_Mode);
| Set the selection mode. The mode can be one of Selection_Single (the default), Selection_Browse, Selection_Multiple, or Selection_Extended. This is only defined for root trees, which makes sense, since the root tree "owns" the selection. Setting it for subtrees has no effect at all; the value is simply ignored.
    procedure Set_View_Lines
      (Tree               : access Gtk_Tree_Record;
       Flag               : in     Boolean);
| If Flag is True then connecting lines between tree items are drawn, otherwise not.
    procedure Set_View_Mode
      (Tree               : access Gtk_Tree_Record;
       Mode               : in     Gtk_Tree_View_Mode);
| Set the "view mode". The mode can be either Tree_View_Line (the default) or Tree_View_Item. The view mode propagates from a tree to its subtrees, and can't be set exclusively to a subtree. The term "view mode" is rather ambiguous - basically, it controls the way the highlight is drawn when one of a tree's children is selected. If it's Tree_View_Line, the entire Tree_Item widget is highlighted, while for Tree_View_Item only the child widget (i.e., usually the label) is highlighted.
    procedure Unselect_Child
      (Tree               : access Gtk_Tree_Record;
       Tree_Item          : access Gtk.Widget.Gtk_Widget_Record'Class);
| Emit the unselect_item signal for the child Tree_Item. As a result, Tree_Item is unselected.
    procedure Unselect_Item
      (Tree               : access Gtk_Tree_Record;
       Item               : in     Gint);
| Emit the "unselect_item" signal for the child at position Item. As a result, the child is unselected.

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