The Gtk.Tree_Store.Gtk_Tree_Store object is a list model for use with a Gtk.Tree_View.Gtk_Tree_View widget. It implements the Gtk.Tree_Model.Gtk_Tree_Model interface, and consequentially, can use all of the methods available there. It also implements the Gtk.Tree_Sortable.Gtk_Tree_Sortable interface so it can be sorted by the view. Finally, it also implements the tree [drag and drop][gtk3-GtkTreeView-drag-and-drop] interfaces.
# GtkTreeStore as GtkBuildable
The GtkTreeStore implementation of the Gtk.Buildable.Gtk_Buildable interface allows to specify the model columns with a <columns> element that may contain multiple <column> elements, each specifying one model column. The "type" attribute specifies the data type for the column.
An example of a UI Definition fragment for a tree store:
<object class="GtkTreeStore">
<columns>
<column type="gchararray"/>
<column type="gchararray"/>
<column type="gint"/>
</columns>
</object>
function "+"
(Widget : access Gtk_Tree_Store_Record'Class)
return Gtk.Buildable.Gtk_Buildable
function "+"
(Widget : access Gtk_Tree_Store_Record'Class)
return Gtk.Tree_Drag_Dest.Gtk_Tree_Drag_Dest
function "+"
(Widget : access Gtk_Tree_Store_Record'Class)
return Gtk.Tree_Drag_Source.Gtk_Tree_Drag_Source
function "+"
(Widget : access Gtk_Tree_Store_Record'Class)
return Gtk.Tree_Model.Gtk_Tree_Model
function "+"
(Widget : access Gtk_Tree_Store_Record'Class)
return Gtk.Tree_Sortable.Gtk_Tree_Sortable
function "-"
(Interf : Gtk.Buildable.Gtk_Buildable)
return Gtk_Tree_Store
function "-"
(Interf : Gtk.Tree_Drag_Dest.Gtk_Tree_Drag_Dest)
return Gtk_Tree_Store
function "-"
(Interf : Gtk.Tree_Drag_Source.Gtk_Tree_Drag_Source)
return Gtk_Tree_Store
function "-"
(Interf : Gtk.Tree_Model.Gtk_Tree_Model)
return Gtk_Tree_Store
function "-"
(Interf : Gtk.Tree_Sortable.Gtk_Tree_Sortable)
return Gtk_Tree_Store
procedure Append
(Tree_Store : not null access Gtk_Tree_Store_Record;
Iter : out Gtk.Tree_Model.Gtk_Tree_Iter;
Parent : Gtk.Tree_Model.Gtk_Tree_Iter)
Appends a new row to Tree_Store. If Parent is non-null, then it will append the new row after the last child of Parent, otherwise it will append a row to the top level. Iter will be changed to point to this new row. The row will be empty after this function is called. To fill in values, you need to call gtk_tree_store_set or Gtk.Tree_Store.Set_Value.
An unset Gtk.Tree_Model.Gtk_Tree_Iter to set to the appended row
A valid Gtk.Tree_Model.Gtk_Tree_Iter, or null
function Children
(Tree_Model : not null access Gtk_Tree_Store_Record;
Parent : Gtk.Tree_Model.Gtk_Tree_Iter)
return Gtk.Tree_Model.Gtk_Tree_Iter
procedure Clear (Tree_Store : not null access Gtk_Tree_Store_Record)
Removes all rows from Tree_Store
function Drag_Data_Delete
(Self : not null access Gtk_Tree_Store_Record;
Path : Gtk.Tree_Model.Gtk_Tree_Path) return Boolean
function Drag_Data_Get
(Self : not null access Gtk_Tree_Store_Record;
Path : Gtk.Tree_Model.Gtk_Tree_Path;
Selection_Data : Gtk.Selection_Data.Gtk_Selection_Data)
return Boolean
function Drag_Data_Received
(Self : not null access Gtk_Tree_Store_Record;
Dest : Gtk.Tree_Model.Gtk_Tree_Path;
Selection_Data : Gtk.Selection_Data.Gtk_Selection_Data)
return Boolean
procedure Foreach
(Tree_Model : not null access Gtk_Tree_Store_Record;
Func : Gtk_Tree_Model_Foreach_Func)
Calls func on each node in model in a depth-first fashion. If Func returns True, then the tree ceases to be walked, and Gtk.Tree_Model.Foreach returns.
a function to be called on each row
function Freeze_Sort
(Tree : access Gtk.Tree_Store.Gtk_Tree_Store_Record'Class)
return Gint
Freeze the sorting in the tree view, and returns the current sort_column_id, which should be used when thawing. (See Thaw_Sort)
function Get_Column_Type
(Tree_Model : not null access Gtk_Tree_Store_Record;
Index : Glib.Gint) return GType
function Get_Flags
(Tree_Model : not null access Gtk_Tree_Store_Record)
return Gtk.Tree_Model.Tree_Model_Flags
function Get_Iter
(Tree_Model : not null access Gtk_Tree_Store_Record;
Path : Gtk.Tree_Model.Gtk_Tree_Path)
return Gtk.Tree_Model.Gtk_Tree_Iter
function Get_Iter_First
(Tree_Model : not null access Gtk_Tree_Store_Record)
return Gtk.Tree_Model.Gtk_Tree_Iter
function Get_Iter_From_String
(Tree_Model : not null access Gtk_Tree_Store_Record;
Path_String : UTF8_String) return Gtk.Tree_Model.Gtk_Tree_Iter
function Get_N_Columns
(Tree_Model : not null access Gtk_Tree_Store_Record) return Glib.Gint
function Get_Path
(Tree_Model : not null access Gtk_Tree_Store_Record;
Iter : Gtk.Tree_Model.Gtk_Tree_Iter)
return Gtk.Tree_Model.Gtk_Tree_Path
procedure Get_Sort_Column_Id
(Sortable : not null access Gtk_Tree_Store_Record;
Sort_Column_Id : out Glib.Gint;
Order : out Gtk.Enums.Gtk_Sort_Type)
function Get_String_From_Iter
(Tree_Model : not null access Gtk_Tree_Store_Record;
Iter : Gtk.Tree_Model.Gtk_Tree_Iter) return UTF8_String
function Get_Type return Glib.GType
procedure Get_Value
(Tree_Model : not null access Gtk_Tree_Store_Record;
Iter : Gtk.Tree_Model.Gtk_Tree_Iter;
Column : Glib.Gint;
Value : out Glib.Values.GValue)
procedure Gtk_New (Tree_Store : out Gtk_Tree_Store; Types : GType_Array)
Non vararg creation function. Used primarily by language bindings. Initialize does nothing if the object was already created with another call to Initialize* or G_New.
an array of GType types for the columns, from first to last
type Gtk_Tree_Iter_Compare_Func is access function
(Model : Gtk.Tree_Model.Gtk_Tree_Model;
A : Gtk.Tree_Model.Gtk_Tree_Iter;
B : Gtk.Tree_Model.Gtk_Tree_Iter) return Glib.Gint;
A GtkTreeIterCompareFunc should return a negative integer, zero, or a positive integer if A sorts before B, A sorts with B, or A sorts after B respectively. If two iters compare as equal, their order in the sorted model is undefined. In order to ensure that the Gtk.Tree_Sortable.Gtk_Tree_Sortable behaves as expected, the GtkTreeIterCompareFunc must define a partial order on the model, i.e. it must be reflexive, antisymmetric and transitive. For example, if Model is a product catalogue, then a compare function for the "price" column could be one which returns price_of(A) - price_of(B).
The Gtk.Tree_Model.Gtk_Tree_Model the comparison is within
A Gtk.Tree_Model.Gtk_Tree_Iter in Model
Another Gtk.Tree_Model.Gtk_Tree_Iter in Model
a negative integer, zero or a positive integer depending on whether A sorts before, with or after B
type Gtk_Tree_Model_Foreach_Func is access function
(Model : Gtk.Tree_Model.Gtk_Tree_Model;
Path : Gtk.Tree_Model.Gtk_Tree_Path;
Iter : Gtk.Tree_Model.Gtk_Tree_Iter) return Boolean;
Type of the callback passed to Gtk.Tree_Model.Foreach to iterate over the rows in a tree model.
the Gtk.Tree_Model.Gtk_Tree_Model being iterated
the current Gtk.Tree_Model.Gtk_Tree_Path
the current Gtk.Tree_Model.Gtk_Tree_Iter
True to stop iterating, False to continue
type Gtk_Tree_Store is access all Gtk_Tree_Store_Record'Class;
function Gtk_Tree_Store_Newv (Types : GType_Array) return Gtk_Tree_Store
Non vararg creation function. Used primarily by language bindings.
an array of GType types for the columns, from first to last
type Gtk_Tree_Store_Record is new Gtk_Root_Tree_Model_Record with null record;
function Has_Child
(Tree_Model : not null access Gtk_Tree_Store_Record;
Iter : Gtk.Tree_Model.Gtk_Tree_Iter) return Boolean
function Has_Default_Sort_Func
(Sortable : not null access Gtk_Tree_Store_Record) return Boolean
package Implements_Gtk_Buildable is new Glib.Types.Implements
(Gtk.Buildable.Gtk_Buildable, Gtk_Tree_Store_Record, Gtk_Tree_Store);
package Implements_Gtk_Tree_Drag_Dest is new Glib.Types.Implements
(Gtk.Tree_Drag_Dest.Gtk_Tree_Drag_Dest, Gtk_Tree_Store_Record, Gtk_Tree_Store);
package Implements_Gtk_Tree_Drag_Source is new Glib.Types.Implements
(Gtk.Tree_Drag_Source.Gtk_Tree_Drag_Source, Gtk_Tree_Store_Record, Gtk_Tree_Store);
package Implements_Gtk_Tree_Model is new Glib.Types.Implements
(Gtk.Tree_Model.Gtk_Tree_Model, Gtk_Tree_Store_Record, Gtk_Tree_Store);
package Implements_Gtk_Tree_Sortable is new Glib.Types.Implements
(Gtk.Tree_Sortable.Gtk_Tree_Sortable, Gtk_Tree_Store_Record, Gtk_Tree_Store);
procedure Initialize
(Tree_Store : not null access Gtk_Tree_Store_Record'Class;
Types : GType_Array)
Non vararg creation function. Used primarily by language bindings. Initialize does nothing if the object was already created with another call to Initialize* or G_New.
an array of GType types for the columns, from first to last
procedure Insert
(Tree_Store : not null access Gtk_Tree_Store_Record;
Iter : out Gtk.Tree_Model.Gtk_Tree_Iter;
Parent : Gtk.Tree_Model.Gtk_Tree_Iter;
Position : Glib.Gint)
Creates a new row at Position. If parent is non-null, then the row will be made a child of Parent. Otherwise, the row will be created at the toplevel. If Position is -1 or is larger than the number of rows at that level, then the new row will be inserted to the end of the list. Iter will be changed to point to this new row. The row will be empty after this function is called. To fill in values, you need to call gtk_tree_store_set or Gtk.Tree_Store.Set_Value.
An unset Gtk.Tree_Model.Gtk_Tree_Iter to set to the new row
A valid Gtk.Tree_Model.Gtk_Tree_Iter, or null
position to insert the new row, or -1 for last
procedure Insert_After
(Tree_Store : not null access Gtk_Tree_Store_Record;
Iter : out Gtk.Tree_Model.Gtk_Tree_Iter;
Parent : Gtk.Tree_Model.Gtk_Tree_Iter;
Sibling : Gtk.Tree_Model.Gtk_Tree_Iter)
Inserts a new row after Sibling. If Sibling is null, then the row will be prepended to Parent 's children. If Parent and Sibling are null, then the row will be prepended to the toplevel. If both Sibling and Parent are set, then Parent must be the parent of Sibling. When Sibling is set, Parent is optional. Iter will be changed to point to this new row. The row will be empty after this function is called. To fill in values, you need to call gtk_tree_store_set or Gtk.Tree_Store.Set_Value.
An unset Gtk.Tree_Model.Gtk_Tree_Iter to set to the new row
A valid Gtk.Tree_Model.Gtk_Tree_Iter, or null
A valid Gtk.Tree_Model.Gtk_Tree_Iter, or null
procedure Insert_Before
(Tree_Store : not null access Gtk_Tree_Store_Record;
Iter : out Gtk.Tree_Model.Gtk_Tree_Iter;
Parent : Gtk.Tree_Model.Gtk_Tree_Iter;
Sibling : Gtk.Tree_Model.Gtk_Tree_Iter)
Inserts a new row before Sibling. If Sibling is null, then the row will be appended to Parent 's children. If Parent and Sibling are null, then the row will be appended to the toplevel. If both Sibling and Parent are set, then Parent must be the parent of Sibling. When Sibling is set, Parent is optional. Iter will be changed to point to this new row. The row will be empty after this function is called. To fill in values, you need to call gtk_tree_store_set or Gtk.Tree_Store.Set_Value.
An unset Gtk.Tree_Model.Gtk_Tree_Iter to set to the new row
A valid Gtk.Tree_Model.Gtk_Tree_Iter, or null
A valid Gtk.Tree_Model.Gtk_Tree_Iter, or null
function Is_Ancestor
(Tree_Store : not null access Gtk_Tree_Store_Record;
Iter : Gtk.Tree_Model.Gtk_Tree_Iter;
Descendant : Gtk.Tree_Model.Gtk_Tree_Iter) return Boolean
Returns True if Iter is an ancestor of Descendant. That is, Iter is the parent (or grandparent or great-grandparent) of Descendant.
A valid Gtk.Tree_Model.Gtk_Tree_Iter
A valid Gtk.Tree_Model.Gtk_Tree_Iter
True, if Iter is an ancestor of Descendant
function Iter_Depth
(Tree_Store : not null access Gtk_Tree_Store_Record;
Iter : Gtk.Tree_Model.Gtk_Tree_Iter) return Glib.Gint
Returns the depth of Iter. This will be 0 for anything on the root level, 1 for anything down a level, etc.
A valid Gtk.Tree_Model.Gtk_Tree_Iter
The depth of Iter
function Iter_Is_Valid
(Tree_Store : not null access Gtk_Tree_Store_Record;
Iter : Gtk.Tree_Model.Gtk_Tree_Iter) return Boolean
WARNING: This function is slow. Only use it for debugging and/or testing purposes. Checks if the given iter is a valid iter for this Gtk.Tree_Store.Gtk_Tree_Store. Since: gtk+ 2.2
A Gtk.Tree_Model.Gtk_Tree_Iter.
True if the iter is valid, False if the iter is invalid.
procedure Move_After
(Tree_Store : not null access Gtk_Tree_Store_Record;
Iter : Gtk.Tree_Model.Gtk_Tree_Iter;
Position : Gtk.Tree_Model.Gtk_Tree_Iter)
Moves Iter in Tree_Store to the position after Position. Iter and Position should be in the same level. Note that this function only works with unsorted stores. If Position is null, Iter will be moved to the start of the level. Since: gtk+ 2.2
A Gtk.Tree_Model.Gtk_Tree_Iter.
A Gtk.Tree_Model.Gtk_Tree_Iter.
procedure Move_Before
(Tree_Store : not null access Gtk_Tree_Store_Record;
Iter : Gtk.Tree_Model.Gtk_Tree_Iter;
Position : Gtk.Tree_Model.Gtk_Tree_Iter)
Moves Iter in Tree_Store to the position before Position. Iter and Position should be in the same level. Note that this function only works with unsorted stores. If Position is null, Iter will be moved to the end of the level. Since: gtk+ 2.2
A Gtk.Tree_Model.Gtk_Tree_Iter.
A Gtk.Tree_Model.Gtk_Tree_Iter or null.
function N_Children
(Tree_Model : not null access Gtk_Tree_Store_Record;
Iter : Gtk.Tree_Model.Gtk_Tree_Iter := Gtk.Tree_Model.Null_Iter)
return Glib.Gint
procedure Next
(Tree_Model : not null access Gtk_Tree_Store_Record;
Iter : in out Gtk.Tree_Model.Gtk_Tree_Iter)
function Nth_Child
(Tree_Model : not null access Gtk_Tree_Store_Record;
Parent : Gtk.Tree_Model.Gtk_Tree_Iter;
N : Glib.Gint) return Gtk.Tree_Model.Gtk_Tree_Iter
function Parent
(Tree_Model : not null access Gtk_Tree_Store_Record;
Child : Gtk.Tree_Model.Gtk_Tree_Iter)
return Gtk.Tree_Model.Gtk_Tree_Iter
procedure Prepend
(Tree_Store : not null access Gtk_Tree_Store_Record;
Iter : out Gtk.Tree_Model.Gtk_Tree_Iter;
Parent : Gtk.Tree_Model.Gtk_Tree_Iter)
Prepends a new row to Tree_Store. If Parent is non-null, then it will prepend the new row before the first child of Parent, otherwise it will prepend a row to the top level. Iter will be changed to point to this new row. The row will be empty after this function is called. To fill in values, you need to call gtk_tree_store_set or Gtk.Tree_Store.Set_Value.
An unset Gtk.Tree_Model.Gtk_Tree_Iter to set to the prepended row
A valid Gtk.Tree_Model.Gtk_Tree_Iter, or null
procedure Previous
(Tree_Model : not null access Gtk_Tree_Store_Record;
Iter : in out Gtk.Tree_Model.Gtk_Tree_Iter)
procedure Ref_Node
(Tree_Model : not null access Gtk_Tree_Store_Record;
Iter : Gtk.Tree_Model.Gtk_Tree_Iter)
procedure Remove
(Tree_Store : not null access Gtk_Tree_Store_Record;
Iter : in out Gtk.Tree_Model.Gtk_Tree_Iter)
Removes Iter from Tree_Store. After being removed, Iter is set to the next valid row at that level, or invalidated if it previously pointed to the last one.
A valid Gtk.Tree_Model.Gtk_Tree_Iter
procedure Reorder
(Tree_Store : not null access Gtk_Tree_Store_Record;
Parent : Gtk.Tree_Model.Gtk_Tree_Iter;
New_Order : Gint_Array)
Reorders the children of Parent in Tree_Store to follow the order indicated by New_Order. Note that this function only works with unsorted stores. Since: gtk+ 2.2
A Gtk.Tree_Model.Gtk_Tree_Iter, or null
an array of integers mapping the new position of each child to its old position before the re-ordering, i.e. New_Order[newpos] = oldpos.
procedure Row_Changed
(Tree_Model : not null access Gtk_Tree_Store_Record;
Path : Gtk.Tree_Model.Gtk_Tree_Path;
Iter : Gtk.Tree_Model.Gtk_Tree_Iter)
procedure Row_Deleted
(Tree_Model : not null access Gtk_Tree_Store_Record;
Path : Gtk.Tree_Model.Gtk_Tree_Path)
function Row_Draggable
(Self : not null access Gtk_Tree_Store_Record;
Path : Gtk.Tree_Model.Gtk_Tree_Path) return Boolean
function Row_Drop_Possible
(Self : not null access Gtk_Tree_Store_Record;
Dest_Path : Gtk.Tree_Model.Gtk_Tree_Path;
Selection_Data : Gtk.Selection_Data.Gtk_Selection_Data)
return Boolean
procedure Row_Has_Child_Toggled
(Tree_Model : not null access Gtk_Tree_Store_Record;
Path : Gtk.Tree_Model.Gtk_Tree_Path;
Iter : Gtk.Tree_Model.Gtk_Tree_Iter)
procedure Row_Inserted
(Tree_Model : not null access Gtk_Tree_Store_Record;
Path : Gtk.Tree_Model.Gtk_Tree_Path;
Iter : Gtk.Tree_Model.Gtk_Tree_Iter)
procedure Rows_Reordered
(Tree_Model : not null access Gtk_Tree_Store_Record;
Path : Gtk.Tree_Model.Gtk_Tree_Path;
Iter : Gtk.Tree_Model.Gtk_Tree_Iter;
New_Order : Gint_Array)
procedure Rows_Reordered_With_Length
(Tree_Model : not null access Gtk_Tree_Store_Record;
Path : Gtk.Tree_Model.Gtk_Tree_Path;
Iter : Gtk.Tree_Model.Gtk_Tree_Iter;
New_Order : Gint_Array;
Length : Glib.Gint)
procedure Set
(Tree_Store : access Gtk_Tree_Store_Record;
Iter : Gtk.Tree_Model.Gtk_Tree_Iter;
Column : Gint;
Value : Glib.C_Proxy)
procedure Set
(Tree_Store : access Gtk_Tree_Store_Record;
Iter : Gtk.Tree_Model.Gtk_Tree_Iter;
Column : Gint;
Value : Gint)
procedure Set
(Tree_Store : access Gtk_Tree_Store_Record;
Iter : Gtk.Tree_Model.Gtk_Tree_Iter;
Column : Gint;
Value : Glib.Object.GObject)
procedure Set
(Tree_Store : access Gtk_Tree_Store_Record;
Iter : Gtk.Tree_Model.Gtk_Tree_Iter;
Column : Gint;
Value : UTF8_String)
procedure Set
(Tree_Store : access Gtk_Tree_Store_Record;
Iter : Gtk.Tree_Model.Gtk_Tree_Iter;
Column : Gint;
Value : Boolean)
procedure Set
(Tree_Store : access Gtk_Tree_Store_Record;
Iter : Gtk.Tree_Model.Gtk_Tree_Iter;
Column : Gint;
Address : System.Address)
procedure Set
(Self : not null access Gtk_Tree_Store_Record;
Iter : Gtk.Tree_Model.Gtk_Tree_Iter;
Columns : Glib.Gint_Array;
Values : Glib.Values.GValue_Array)
A variant of Set which takes the columns and valus as two arrays. This is more efficient when changing multiple values than calling one of the Set procedures above multiple times.
procedure Set
(Self : not null access Gtk_Tree_Store_Record;
Iter : Gtk.Tree_Model.Gtk_Tree_Iter;
Values : Glib.Values.GValue_Array)
A variant of the above that is used to set all the columns.
procedure Set_Column_Types
(Tree_Store : not null access Gtk_Tree_Store_Record;
Types : GType_Array)
This function is meant primarily for GObjects that inherit from Gtk.Tree_Store.Gtk_Tree_Store, and should only be used when constructing a new Gtk.Tree_Store.Gtk_Tree_Store. It will not function after a row has been added, or a method on the Gtk.Tree_Model.Gtk_Tree_Model interface is called.
An array of GType types, one for each column
procedure Set_Default_Sort_Func
(Sortable : not null access Gtk_Tree_Store_Record;
Sort_Func : Gtk_Tree_Iter_Compare_Func)
Sets the default comparison function used when sorting to be Sort_Func. If the current sort column id of Sortable is GTK_TREE_SORTABLE_DEFAULT_SORT_COLUMN_ID, then the model will sort using this function. If Sort_Func is null, then there will be no default comparison function. This means that once the model has been sorted, it can't go back to the default state. In this case, when the current sort column id of Sortable is GTK_TREE_SORTABLE_DEFAULT_SORT_COLUMN_ID, the model will be unsorted.
The comparison function
procedure Set_Sort_Column_Id
(Sortable : not null access Gtk_Tree_Store_Record;
Sort_Column_Id : Glib.Gint;
Order : Gtk.Enums.Gtk_Sort_Type)
procedure Set_Sort_Func
(Sortable : not null access Gtk_Tree_Store_Record;
Sort_Column_Id : Glib.Gint;
Sort_Func : Gtk_Tree_Iter_Compare_Func)
Sets the comparison function used when sorting to be Sort_Func. If the current sort column id of Sortable is the same as Sort_Column_Id, then the model will sort using this function.
the sort column id to set the function for
The comparison function
procedure Set_Ulong
(Tree_Store : access Gtk_Tree_Store_Record;
Iter : Gtk.Tree_Model.Gtk_Tree_Iter;
Column : Gint;
Value : Gulong)
procedure Set_Value
(Tree_Store : not null access Gtk_Tree_Store_Record;
Iter : Gtk.Tree_Model.Gtk_Tree_Iter;
Column : Glib.Gint;
Value : Glib.Values.GValue)
Sets the data in the cell specified by Iter and Column. The type of Value must be convertible to the type of the column.
A valid Gtk.Tree_Model.Gtk_Tree_Iter for the row being modified
column number to modify
new value for the cell
procedure Sort_Column_Changed
(Sortable : not null access Gtk_Tree_Store_Record)
procedure Swap
(Tree_Store : not null access Gtk_Tree_Store_Record;
A : Gtk.Tree_Model.Gtk_Tree_Iter;
B : Gtk.Tree_Model.Gtk_Tree_Iter)
Swaps A and B in the same level of Tree_Store. Note that this function only works with unsorted stores. Since: gtk+ 2.2
A Gtk.Tree_Model.Gtk_Tree_Iter.
Another Gtk.Tree_Model.Gtk_Tree_Iter.
procedure Thaw_Sort
(Tree : access Gtk.Tree_Store.Gtk_Tree_Store_Record'Class;
Column_Id : Gint)
Thaw a frozen tree_view. Column_Id should be the value returned by the corresponding call to Freeze_Sort.
procedure Unref_Node
(Tree_Model : not null access Gtk_Tree_Store_Record;
Iter : Gtk.Tree_Model.Gtk_Tree_Iter)