GtkTreeSortable

GtkTreeSortable — The interface for sortable models used by GtkTreeView

Object Hierarchy

    GInterface
    ╰── GtkTreeSortable

Prerequisites

GtkTreeSortable requires GtkTreeModel and GObject.

Known Implementations

GtkTreeSortable is implemented by GtkListStore, GtkTreeModelSort and GtkTreeStore.

Includes

#include <gtk/gtk.h>

Description

GtkTreeSortable is an interface to be implemented by tree models which support sorting. The GtkTreeView uses the methods provided by this interface to sort the model.

Functions

GtkTreeIterCompareFunc ()

gint
(*GtkTreeIterCompareFunc) (GtkTreeModel *model,
                           GtkTreeIter *a,
                           GtkTreeIter *b,
                           gpointer user_data);

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 GtkTreeSortable 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).

Parameters

model

The GtkTreeModel the comparison is within

 

a

A GtkTreeIter in model

 

b

Another GtkTreeIter in model

 

user_data

Data passed when the compare func is assigned e.g. by gtk_tree_sortable_set_sort_func()

 

Returns

a negative integer, zero or a positive integer depending on whether a sorts before, with or after b


gtk_tree_sortable_sort_column_changed ()

void
gtk_tree_sortable_sort_column_changed (GtkTreeSortable *sortable);

Emits a “sort-column-changed” signal on sortable .

Parameters

sortable

A GtkTreeSortable

 

gtk_tree_sortable_get_sort_column_id ()

gboolean
gtk_tree_sortable_get_sort_column_id (GtkTreeSortable *sortable,
                                      gint *sort_column_id,
                                      GtkSortType *order);

Fills in sort_column_id and order with the current sort column and the order. It returns TRUE unless the sort_column_id is GTK_TREE_SORTABLE_DEFAULT_SORT_COLUMN_ID or GTK_TREE_SORTABLE_UNSORTED_SORT_COLUMN_ID.

Parameters

sortable

A GtkTreeSortable

 

sort_column_id

The sort column id to be filled in.

[out]

order

The GtkSortType to be filled in.

[out]

Returns

TRUE if the sort column is not one of the special sort column ids.


gtk_tree_sortable_set_sort_column_id ()

void
gtk_tree_sortable_set_sort_column_id (GtkTreeSortable *sortable,
                                      gint sort_column_id,
                                      GtkSortType order);

Sets the current sort column to be sort_column_id . The sortable will resort itself to reflect this change, after emitting a “sort-column-changed” signal. sort_column_id may either be a regular column id, or one of the following special values:

Parameters

sortable

A GtkTreeSortable

 

sort_column_id

the sort column id to set

 

order

The sort order of the column

 

gtk_tree_sortable_set_sort_func ()

void
gtk_tree_sortable_set_sort_func (GtkTreeSortable *sortable,
                                 gint sort_column_id,
                                 GtkTreeIterCompareFunc sort_func,
                                 gpointer user_data,
                                 GDestroyNotify destroy);

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.

Parameters

sortable

A GtkTreeSortable

 

sort_column_id

the sort column id to set the function for

 

sort_func

The comparison function

 

user_data

User data to pass to sort_func , or NULL.

[allow-none]

destroy

Destroy notifier of user_data , or NULL.

[allow-none]

gtk_tree_sortable_set_default_sort_func ()

void
gtk_tree_sortable_set_default_sort_func
                               (GtkTreeSortable *sortable,
                                GtkTreeIterCompareFunc sort_func,
                                gpointer user_data,
                                GDestroyNotify destroy);

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.

Parameters

sortable

A GtkTreeSortable

 

sort_func

The comparison function

 

user_data

User data to pass to sort_func , or NULL.

[allow-none]

destroy

Destroy notifier of user_data , or NULL.

[allow-none]

gtk_tree_sortable_has_default_sort_func ()

gboolean
gtk_tree_sortable_has_default_sort_func
                               (GtkTreeSortable *sortable);

Returns TRUE if the model has a default sort function. This is used primarily by GtkTreeViewColumns in order to determine if a model can go back to the default state, or not.

Parameters

sortable

A GtkTreeSortable

 

Returns

TRUE, if the model has a default sort function

Types and Values

GtkTreeSortable

typedef struct _GtkTreeSortable GtkTreeSortable;

struct GtkTreeSortableIface

struct GtkTreeSortableIface {
  /* signals */
  void     (* sort_column_changed)   (GtkTreeSortable        *sortable);

  /* virtual table */
  gboolean (* get_sort_column_id)    (GtkTreeSortable        *sortable,
				      gint                   *sort_column_id,
				      GtkSortType            *order);
  void     (* set_sort_column_id)    (GtkTreeSortable        *sortable,
				      gint                    sort_column_id,
				      GtkSortType             order);
  void     (* set_sort_func)         (GtkTreeSortable        *sortable,
				      gint                    sort_column_id,
				      GtkTreeIterCompareFunc  sort_func,
				      gpointer                user_data,
				      GDestroyNotify          destroy);
  void     (* set_default_sort_func) (GtkTreeSortable        *sortable,
				      GtkTreeIterCompareFunc  sort_func,
				      gpointer                user_data,
				      GDestroyNotify          destroy);
  gboolean (* has_default_sort_func) (GtkTreeSortable        *sortable);
};

Members

sort_column_changed ()

Signal emitted when the sort column or sort order of sortable is changed.

 

get_sort_column_id ()

Fills in sort_column_id and order with the current sort column and the order.

 

set_sort_column_id ()

Sets the current sort column to be sort_column_id.

 

set_sort_func ()

Sets the comparison function used when sorting to be sort_func.

 

set_default_sort_func ()

Sets the default comparison function used when sorting to be sort_func.

 

has_default_sort_func ()

TRUE if the model has a default sort function.

 

GTK_TREE_SORTABLE_DEFAULT_SORT_COLUMN_ID

#define GTK_TREE_SORTABLE_DEFAULT_SORT_COLUMN_ID (-1)

The GTK_TREE_SORTABLE_DEFAULT_SORT_COLUMN_ID can be used to make a GtkTreeSortable use the default sort function.

See also gtk_tree_sortable_set_sort_column_id()


GTK_TREE_SORTABLE_UNSORTED_SORT_COLUMN_ID

#define GTK_TREE_SORTABLE_UNSORTED_SORT_COLUMN_ID (-2)

The GTK_TREE_SORTABLE_DEFAULT_SORT_COLUMN_ID can be used to make a GtkTreeSortable use no sorting.

See also gtk_tree_sortable_set_sort_column_id()

Signal Details

The “sort-column-changed” signal

void
user_function (GtkTreeSortable *sortable,
               gpointer         user_data)

The ::sort-column-changed signal is emitted when the sort column or sort order of sortable is changed. The signal is emitted before the contents of sortable are resorted.

Parameters

sortable

the object on which the signal is emitted

 

user_data

user data set when the signal handler was connected.

 

Flags: Run Last