Class

GtkListStore

Description [src]

class Gtk.ListStore : GObject.Object {
  parent: GObject
}

A list-like data structure that can be used with the GtkTreeView

The GtkListStore object is a list model for use with a GtkTreeView widget. It implements the GtkTreeModel interface, and consequentialy, can use all of the methods available there. It also implements the GtkTreeSortable interface so it can be sorted by the view. Finally, it also implements the tree [drag and drop][gtk4-GtkTreeView-drag-and-drop] interfaces.

The GtkListStore can accept most GObject types as a column type, though it can’t accept all custom types. Internally, it will keep a copy of data passed in (such as a string or a boxed pointer). Columns that accept GObjects are handled a little differently. The GtkListStore will keep a reference to the object instead of copying the value. As a result, if the object is modified, it is up to the application writer to call gtk_tree_model_row_changed() to emit the GtkTreeModel::row_changed signal. This most commonly affects lists with GdkTextures stored.

An example for creating a simple list store:

enum {
  COLUMN_STRING,
  COLUMN_INT,
  COLUMN_BOOLEAN,
  N_COLUMNS
};

{
  GtkListStore *list_store;
  GtkTreePath *path;
  GtkTreeIter iter;
  int i;

  list_store = gtk_list_store_new (N_COLUMNS,
                                   G_TYPE_STRING,
                                   G_TYPE_INT,
                                   G_TYPE_BOOLEAN);

  for (i = 0; i < 10; i++)
    {
      char *some_data;

      some_data = get_some_data (i);

      // Add a new row to the model
      gtk_list_store_append (list_store, &iter);
      gtk_list_store_set (list_store, &iter,
                          COLUMN_STRING, some_data,
                          COLUMN_INT, i,
                          COLUMN_BOOLEAN,  FALSE,
                          -1);

      // As the store will keep a copy of the string internally,
      // we free some_data.
      g_free (some_data);
    }

  // Modify a particular row
  path = gtk_tree_path_new_from_string ("4");
  gtk_tree_model_get_iter (GTK_TREE_MODEL (list_store),
                           &iter,
                           path);
  gtk_tree_path_free (path);
  gtk_list_store_set (list_store, &iter,
                      COLUMN_BOOLEAN, TRUE,
                      -1);
}

Performance Considerations

Internally, the GtkListStore was originally implemented with a linked list with a tail pointer. As a result, it was fast at data insertion and deletion, and not fast at random data access. The GtkListStore sets the GTK_TREE_MODEL_ITERS_PERSIST flag, which means that GtkTreeIters can be cached while the row exists. Thus, if access to a particular row is needed often and your code is expected to run on older versions of GTK, it is worth keeping the iter around.

Atomic Operations

It is important to note that only the methods gtk_list_store_insert_with_values() and gtk_list_store_insert_with_valuesv() are atomic, in the sense that the row is being appended to the store and the values filled in in a single operation with regard to GtkTreeModel signaling. In contrast, using e.g. gtk_list_store_append() and then gtk_list_store_set() will first create a row, which triggers the GtkTreeModel::row-inserted signal on GtkListStore. The row, however, is still empty, and any signal handler connecting to GtkTreeModel::row-inserted on this particular store should be prepared for the situation that the row might be empty. This is especially important if you are wrapping the GtkListStore inside a GtkTreeModelFilter and are using a GtkTreeModelFilterVisibleFunc. Using any of the non-atomic operations to append rows to the GtkListStore will cause the GtkTreeModelFilterVisibleFunc to be visited with an empty row first; the function must be prepared for that.

GtkListStore as GtkBuildable

The GtkListStore implementation of the GtkBuildable interface allows to specify the model columns with a element that may contain multiple elements, each specifying one model column. The “type” attribute specifies the data type for the column.

Additionally, it is possible to specify content for the list store in the UI definition, with the element. It can contain multiple elements, each specifying to content for one row of the list model. Inside a , the elements specify the content for individual cells.

Note that it is probably more common to define your models in the code, and one might consider it a layering violation to specify the content of a list store in a UI definition, data, not presentation, and common wisdom is to separate the two, as far as possible.

An example of a UI Definition fragment for a list store:

<object class="GtkListStore">
  <columns>
    <column type="gchararray"/>
    <column type="gchararray"/>
    <column type="gint"/>
  </columns>
  <data>
    <row>
      <col id="0">John</col>
      <col id="1">Doe</col>
      <col id="2">25</col>
    </row>
    <row>
      <col id="0">Johan</col>
      <col id="1">Dahlin</col>
      <col id="2">50</col>
    </row>
  </data>
</object>

Hierarchy

hierarchy this GtkListStore implements_0 GtkBuildable this--implements_0 implements_1 GtkTreeDragDest this--implements_1 implements_2 GtkTreeDragSource this--implements_2 implements_3 GtkTreeModel this--implements_3 implements_4 GtkTreeSortable this--implements_4 ancestor_0 GObject ancestor_0--this

Ancestors

Constructors

gtk_list_store_new

Creates a new list store as with n_columns columns each of the types passed in. Note that only types derived from standard GObject fundamental types are supported.

gtk_list_store_newv

Non-vararg creation function. Used primarily by language bindings.

Instance methods

gtk_list_store_append

Appends a new row to list_store. 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_list_store_set() or gtk_list_store_set_value().

gtk_list_store_clear

Removes all rows from the list store.

gtk_list_store_insert

Creates a new row at position. iter will be changed to point to this new row. If position is -1 or is larger than the number of rows on the list, then the new row will be appended to the list. The row will be empty after this function is called. To fill in values, you need to call gtk_list_store_set() or gtk_list_store_set_value().

gtk_list_store_insert_after

Inserts a new row after sibling. If sibling is NULL, then the row will be prepended to the beginning 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_list_store_set() or gtk_list_store_set_value().

gtk_list_store_insert_before

Inserts a new row before sibling. If sibling is NULL, then the row will be appended 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_list_store_set() or gtk_list_store_set_value().

gtk_list_store_insert_with_values

Creates a new row at position. iter will be changed to point to this new row. If position is -1, or larger than the number of rows in the list, then the new row will be appended to the list. The row will be filled with the values given to this function.

gtk_list_store_insert_with_valuesv

A variant of gtk_list_store_insert_with_values() which takes the columns and values as two arrays, instead of varargs.

gtk_list_store_iter_is_valid

Checks if the given iter is a valid iter for this GtkListStore.

gtk_list_store_move_after

Moves iter in store to the position after position. Note that this function only works with unsorted stores. If position is NULL, iter will be moved to the start of the list.

gtk_list_store_move_before

Moves iter in store to the position before position. Note that this function only works with unsorted stores. If position is NULL, iter will be moved to the end of the list.

gtk_list_store_prepend

Prepends a new row to list_store. 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_list_store_set() or gtk_list_store_set_value().

gtk_list_store_remove

Removes the given row from the list store. After being removed, iter is set to be the next valid row, or invalidated if it pointed to the last row in list_store.

gtk_list_store_reorder

Reorders store to follow the order indicated by new_order. Note that this function only works with unsorted stores.

gtk_list_store_set

Sets the value of one or more cells in the row referenced by iter. The variable argument list should contain integer column numbers, each column number followed by the value to be set. The list is terminated by a -1. For example, to set column 0 with type G_TYPE_STRING to “Foo”, you would write gtk_list_store_set (store, iter, 0, "Foo", -1).

gtk_list_store_set_column_types

This function is meant primarily for GObjects that inherit from GtkListStore, and should only be used when constructing a new GtkListStore. It will not function after a row has been added, or a method on the GtkTreeModel interface is called.

gtk_list_store_set_valist

See gtk_list_store_set(); this version takes a va_list for use by language bindings.

gtk_list_store_set_value

Sets the data in the cell specified by iter and column. The type of value must be convertible to the type of the column.

gtk_list_store_set_valuesv

A variant of gtk_list_store_set_valist() which takes the columns and values as two arrays, instead of varargs. This function is mainly intended for language-bindings and in case the number of columns to change is not known until run-time.

gtk_list_store_swap

Swaps a and b in store. Note that this function only works with unsorted stores.

Methods inherited from GObject (42)
Methods inherited from GtkBuildable (1)
gtk_buildable_get_buildable_id

Gets the ID of the buildable object.

Methods inherited from GtkTreeDragDest (2)
gtk_tree_drag_dest_drag_data_received

Asks the GtkTreeDragDest to insert a row before the path dest, deriving the contents of the row from value. If dest is outside the tree so that inserting before it is impossible, FALSE will be returned. Also, FALSE may be returned if the new row is not created for some model-specific reason. Should robustly handle a dest no longer found in the model!

gtk_tree_drag_dest_row_drop_possible

Determines whether a drop is possible before the given dest_path, at the same depth as dest_path. i.e., can we drop the data in value at that location. dest_path does not have to exist; the return value will almost certainly be FALSE if the parent of dest_path doesn’t exist, though.

Methods inherited from GtkTreeDragSource (3)
gtk_tree_drag_source_drag_data_delete

Asks the GtkTreeDragSource to delete the row at path, because it was moved somewhere else via drag-and-drop. Returns FALSE if the deletion fails because path no longer exists, or for some model-specific reason. Should robustly handle a path no longer found in the model!

gtk_tree_drag_source_drag_data_get

Asks the GtkTreeDragSource to return a GdkContentProvider representing the row at path. Should robustly handle a path no longer found in the model!

gtk_tree_drag_source_row_draggable

Asks the GtkTreeDragSource whether a particular row can be used as the source of a DND operation. If the source doesn’t implement this interface, the row is assumed draggable.

Methods inherited from GtkTreeModel (28)
Methods inherited from GtkTreeSortable (6)
gtk_tree_sortable_get_sort_column_id

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.

gtk_tree_sortable_has_default_sort_func

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.

gtk_tree_sortable_set_default_sort_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.

gtk_tree_sortable_set_sort_column_id

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

gtk_tree_sortable_set_sort_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.

gtk_tree_sortable_sort_column_changed

Emits a GtkTreeSortable::sort-column-changed signal on sortable.

Signals

Signals inherited from GObject (1)
GObject.Object::notify

The notify signal is emitted on an object when one of its properties has its value set through g_object_set_property(), g_object_set(), et al.

Signals inherited from GtkTreeModel (5)
Gtk.TreeModel::row-changed

This signal is emitted when a row in the model has changed.

Gtk.TreeModel::row-deleted

This signal is emitted when a row has been deleted.

Gtk.TreeModel::row-has-child-toggled

This signal is emitted when a row has gotten the first child row or lost its last child row.

Gtk.TreeModel::row-inserted

This signal is emitted when a new row has been inserted in the model.

Gtk.TreeModel::rows-reordered

This signal is emitted when the children of a node in the GtkTreeModel have been reordered.

Signals inherited from GtkTreeSortable (1)
Gtk.TreeSortable::sort-column-changed

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.

Class structure

struct GtkListStoreClass {
  GObjectClass parent_class;
  
}
Class members
parent_class
GObjectClass
  No description available.