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GtkTreeModel

GtkTreeModel — The tree interface used by GtkTreeView

Functions

gboolean (*GtkTreeModelForeachFunc) ()
GtkTreePath * gtk_tree_path_new ()
GtkTreePath * gtk_tree_path_new_from_string ()
GtkTreePath * gtk_tree_path_new_from_indices ()
gchar * gtk_tree_path_to_string ()
GtkTreePath * gtk_tree_path_new_first ()
#define gtk_tree_path_new_root
void gtk_tree_path_append_index ()
void gtk_tree_path_prepend_index ()
gint gtk_tree_path_get_depth ()
gint * gtk_tree_path_get_indices ()
gint * gtk_tree_path_get_indices_with_depth ()
void gtk_tree_path_free ()
GtkTreePath * gtk_tree_path_copy ()
gint gtk_tree_path_compare ()
void gtk_tree_path_next ()
gboolean gtk_tree_path_prev ()
gboolean gtk_tree_path_up ()
void gtk_tree_path_down ()
gboolean gtk_tree_path_is_ancestor ()
gboolean gtk_tree_path_is_descendant ()
GtkTreeRowReference * gtk_tree_row_reference_new ()
GtkTreeRowReference * gtk_tree_row_reference_new_proxy ()
GtkTreeModel * gtk_tree_row_reference_get_model ()
GtkTreePath * gtk_tree_row_reference_get_path ()
gboolean gtk_tree_row_reference_valid ()
void gtk_tree_row_reference_free ()
GtkTreeRowReference * gtk_tree_row_reference_copy ()
void gtk_tree_row_reference_inserted ()
void gtk_tree_row_reference_deleted ()
void gtk_tree_row_reference_reordered ()
GtkTreeIter * gtk_tree_iter_copy ()
void gtk_tree_iter_free ()
GtkTreeModelFlags gtk_tree_model_get_flags ()
gint gtk_tree_model_get_n_columns ()
GType gtk_tree_model_get_column_type ()
gboolean gtk_tree_model_get_iter ()
gboolean gtk_tree_model_get_iter_from_string ()
gboolean gtk_tree_model_get_iter_first ()
#define gtk_tree_model_get_iter_root()
GtkTreePath * gtk_tree_model_get_path ()
void gtk_tree_model_get_value ()
gboolean gtk_tree_model_iter_next ()
gboolean gtk_tree_model_iter_children ()
gboolean gtk_tree_model_iter_has_child ()
gint gtk_tree_model_iter_n_children ()
gboolean gtk_tree_model_iter_nth_child ()
gboolean gtk_tree_model_iter_parent ()
gchar * gtk_tree_model_get_string_from_iter ()
void gtk_tree_model_ref_node ()
void gtk_tree_model_unref_node ()
void gtk_tree_model_get ()
void gtk_tree_model_get_valist ()
void gtk_tree_model_foreach ()
void gtk_tree_model_row_changed ()
void gtk_tree_model_row_inserted ()
void gtk_tree_model_row_has_child_toggled ()
void gtk_tree_model_row_deleted ()
void gtk_tree_model_rows_reordered ()

Object Hierarchy

    GBoxed
    ├── GtkTreeIter
    ╰── GtkTreePath
    GInterface
    ╰── GtkTreeModel

Prerequisites

GtkTreeModel requires GObject.

Known Derived Interfaces

GtkTreeModel is required by GtkTreeSortable.

Known Implementations

GtkTreeModel is implemented by GtkListStore, GtkTreeModelFilter, GtkTreeModelSort and GtkTreeStore.

Includes

#include <gtk/gtk.h>

Description

The GtkTreeModel interface defines a generic tree interface for use by the GtkTreeView widget. It is an abstract interface, and is designed to be usable with any appropriate data structure. The programmer just has to implement this interface on their own data type for it to be viewable by a GtkTreeView widget.

The model is represented as a hierarchical tree of strongly-typed, columned data. In other words, the model can be seen as a tree where every node has different values depending on which column is being queried. The type of data found in a column is determined by using the GType system (ie. G_TYPE_INT, GTK_TYPE_BUTTON, G_TYPE_POINTER, etc.). The types are homogeneous per column across all nodes. It is important to note that this interface only provides a way of examining a model and observing changes. The implementation of each individual model decides how and if changes are made.

In order to make life simpler for programmers who do not need to write their own specialized model, two generic models are provided — the GtkTreeStore and the GtkListStore. To use these, the developer simply pushes data into these models as necessary. These models provide the data structure as well as all appropriate tree interfaces. As a result, implementing drag and drop, sorting, and storing data is trivial. For the vast majority of trees and lists, these two models are sufficient.

Models are accessed on a node/column level of granularity. One can query for the value of a model at a certain node and a certain column on that node. There are two structures used to reference a particular node in a model. They are the GtkTreePath and the GtkTreeIter [4] Most of the interface consists of operations on a GtkTreeIter.

A path is essentially a potential node. It is a location on a model that may or may not actually correspond to a node on a specific model. The GtkTreePath struct can be converted into either an array of unsigned integers or a string. The string form is a list of numbers separated by a colon. Each number refers to the offset at that level. Thus, the path 0 refers to the root node and the path 2:4 refers to the fifth child of the third node.

By contrast, a GtkTreeIter is a reference to a specific node on a specific model. It is a generic struct with an integer and three generic pointers. These are filled in by the model in a model-specific way. One can convert a path to an iterator by calling gtk_tree_model_get_iter(). These iterators are the primary way of accessing a model and are similar to the iterators used by GtkTextBuffer. They are generally statically allocated on the stack and only used for a short time. The model interface defines a set of operations using them for navigating the model.

It is expected that models fill in the iterator with private data. For example, the GtkListStore model, which is internally a simple linked list, stores a list node in one of the pointers. The GtkTreeModelSort stores an array and an offset in two of the pointers. Additionally, there is an integer field. This field is generally filled with a unique stamp per model. This stamp is for catching errors resulting from using invalid iterators with a model.

The lifecycle of an iterator can be a little confusing at first. Iterators are expected to always be valid for as long as the model is unchanged (and doesn't emit a signal). The model is considered to own all outstanding iterators and nothing needs to be done to free them from the user's point of view. Additionally, some models guarantee that an iterator is valid for as long as the node it refers to is valid (most notably the GtkTreeStore and GtkListStore). Although generally uninteresting, as one always has to allow for the case where iterators do not persist beyond a signal, some very important performance enhancements were made in the sort model. As a result, the GTK_TREE_MODEL_ITERS_PERSIST flag was added to indicate this behavior.

To help show some common operation of a model, some examples are provided. The first example shows three ways of getting the iter at the location 3:2:5. While the first method shown is easier, the second is much more common, as you often get paths from callbacks.

Example 16. Acquiring a GtkTreeIter

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/* Three ways of getting the iter pointing to the location
 */
{
  GtkTreePath *path;
  GtkTreeIter iter;
  GtkTreeIter parent_iter;
  /* get the iterator from a string */
  gtk_tree_model_get_iter_from_string (model, &iter, "3:2:5");
  /* get the iterator from a path */
  path = gtk_tree_path_new_from_string ("3:2:5");
  gtk_tree_model_get_iter (model, &iter, path);
  gtk_tree_path_free (path);
  /* walk the tree to find the iterator */
  gtk_tree_model_iter_nth_child (model, &iter, NULL, 3);
  parent_iter = iter;
  gtk_tree_model_iter_nth_child (model, &iter, &parent_iter, 2);
  parent_iter = iter;
  gtk_tree_model_iter_nth_child (model, &iter, &parent_iter, 5);
}


This second example shows a quick way of iterating through a list and getting a string and an integer from each row. The populate_model function used below is not shown, as it is specific to the GtkListStore. For information on how to write such a function, see the GtkListStore documentation.

Example 17. Reading data from a GtkTreeModel

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enum
{
  STRING_COLUMN,
  INT_COLUMN,
  N_COLUMNS
};
{
  GtkTreeModel *list_store;
  GtkTreeIter iter;
  gboolean valid;
  gint row_count = 0;
  /* make a new list_store */
  list_store = gtk_list_store_new (N_COLUMNS, G_TYPE_STRING, G_TYPE_INT);
  /* Fill the list store with data */
  populate_model (list_store);
  /* Get the first iter in the list */
  valid = gtk_tree_model_get_iter_first (list_store, &iter);
  while (valid)
    {
      /* Walk through the list, reading each row */
      gchar *str_data;
      gint   int_data;
      /* Make sure you terminate calls to gtk_tree_model_get()
       * with a '-1' value
       */
      gtk_tree_model_get (list_store, &iter,
                          STRING_COLUMN, &str_data,
                          INT_COLUMN, &int_data,
                          -1);
      /* Do something with the data */
      g_print ("Row %d: (%s,%d)\n", row_count, str_data, int_data);
      g_free (str_data);
      row_count ++;
      valid = gtk_tree_model_iter_next (list_store, &iter);
    }
}


Functions

GtkTreeModelForeachFunc ()

gboolean
(*GtkTreeModelForeachFunc) (GtkTreeModel *model,
                            GtkTreePath *path,
                            GtkTreeIter *iter,
                            gpointer data);

Parameters

model

The GtkTreeModel currently being iterated

 

path

The current GtkTreePath

 

iter

The current GtkTreeIter

 

data

The user data passed to gtk_tree_model_foreach()

 

Returns

TRUE to stop iterating, FALSE to continue.


gtk_tree_path_new ()

GtkTreePath *
gtk_tree_path_new (void);

Creates a new GtkTreePath. This structure refers to a row.

Returns

A newly created GtkTreePath.


gtk_tree_path_new_from_string ()

GtkTreePath *
gtk_tree_path_new_from_string (const gchar *path);

Creates a new GtkTreePath initialized to path . path is expected to be a colon separated list of numbers. For example, the string "10:4:0" would create a path of depth 3 pointing to the 11th child of the root node, the 5th child of that 11th child, and the 1st child of that 5th child. If an invalid path string is passed in, NULL is returned.

Parameters

path

The string representation of a path.

 

Returns

A newly-created GtkTreePath, or NULL


gtk_tree_path_new_from_indices ()

GtkTreePath *
gtk_tree_path_new_from_indices (gint first_index,
                                ...);

Creates a new path with first_index and varargs as indices.

Parameters

first_index

first integer

 

Returns

A newly created GtkTreePath.

Since: 2.2


gtk_tree_path_to_string ()

gchar *
gtk_tree_path_to_string (GtkTreePath *path);

Generates a string representation of the path. This string is a ':' separated list of numbers. For example, "4:10:0:3" would be an acceptable return value for this string.

Parameters

path

A GtkTreePath

 

Returns

A newly-allocated string. Must be freed with g_free().


gtk_tree_path_new_first ()

GtkTreePath *
gtk_tree_path_new_first (void);

Creates a new GtkTreePath. The string representation of this path is "0"

Returns

A new GtkTreePath.


gtk_tree_path_new_root

#define gtk_tree_path_new_root() gtk_tree_path_new_first()

gtk_tree_path_new_root is deprecated and should not be used in newly-written code.

Use gtk_tree_path_new_first() instead.

An alternate name for gtk_tree_path_new_first() provided for compatibility reasons.

Returns

A new GtkTreePath.


gtk_tree_path_append_index ()

void
gtk_tree_path_append_index (GtkTreePath *path,
                            gint index_);

Appends a new index to a path. As a result, the depth of the path is increased.

Parameters

path

A GtkTreePath.

 

index_

The index.

 

gtk_tree_path_prepend_index ()

void
gtk_tree_path_prepend_index (GtkTreePath *path,
                             gint index_);

Prepends a new index to a path. As a result, the depth of the path is increased.

Parameters

path

A GtkTreePath.

 

index_

The index.

 

gtk_tree_path_get_depth ()

gint
gtk_tree_path_get_depth (GtkTreePath *path);

Returns the current depth of path .

Parameters

path

A GtkTreePath.

 

Returns

The depth of path


gtk_tree_path_get_indices ()

gint *
gtk_tree_path_get_indices (GtkTreePath *path);

Returns the current indices of path . This is an array of integers, each representing a node in a tree. This value should not be freed.

Parameters

path

A GtkTreePath.

 

Returns

The current indices, or NULL.


gtk_tree_path_get_indices_with_depth ()

gint *
gtk_tree_path_get_indices_with_depth (GtkTreePath *path,
                                      gint *depth);

Returns the current indices of path . This is an array of integers, each representing a node in a tree. It also returns the number of elements in the array. The array should not be freed.

Parameters

path

A GtkTreePath.

 

depth

Number of elements returned in the integer array

 

Returns

The current indices, or NULL.

[array length=depth][transfer none]

Since: 2.22


gtk_tree_path_free ()

void
gtk_tree_path_free (GtkTreePath *path);

Frees path .

Parameters

path

A GtkTreePath.

 

gtk_tree_path_copy ()

GtkTreePath *
gtk_tree_path_copy (const GtkTreePath *path);

Creates a new GtkTreePath as a copy of path .

Parameters

path

A GtkTreePath.

 

Returns

A new GtkTreePath.


gtk_tree_path_compare ()

gint
gtk_tree_path_compare (const GtkTreePath *a,
                       const GtkTreePath *b);

Compares two paths. If a appears before b in a tree, then -1 is returned. If b appears before a , then 1 is returned. If the two nodes are equal, then 0 is returned.

Parameters

a

A GtkTreePath.

 

b

A GtkTreePath to compare with.

 

Returns

The relative positions of a and b


gtk_tree_path_next ()

void
gtk_tree_path_next (GtkTreePath *path);

Moves the path to point to the next node at the current depth.

Parameters

path

A GtkTreePath.

 

gtk_tree_path_prev ()

gboolean
gtk_tree_path_prev (GtkTreePath *path);

Moves the path to point to the previous node at the current depth, if it exists.

Parameters

path

A GtkTreePath.

 

Returns

TRUE if path has a previous node, and the move was made.


gtk_tree_path_up ()

gboolean
gtk_tree_path_up (GtkTreePath *path);

Moves the path to point to its parent node, if it has a parent.

Parameters

path

A GtkTreePath.

 

Returns

TRUE if path has a parent, and the move was made.


gtk_tree_path_down ()

void
gtk_tree_path_down (GtkTreePath *path);

Moves path to point to the first child of the current path.

Parameters

path

A GtkTreePath.

 

gtk_tree_path_is_ancestor ()

gboolean
gtk_tree_path_is_ancestor (GtkTreePath *path,
                           GtkTreePath *descendant);

Returns TRUE if descendant is a descendant of path .

Parameters

path

a GtkTreePath

 

descendant

another GtkTreePath

 

Returns

TRUE if descendant is contained inside path


gtk_tree_path_is_descendant ()

gboolean
gtk_tree_path_is_descendant (GtkTreePath *path,
                             GtkTreePath *ancestor);

Returns TRUE if path is a descendant of ancestor .

Parameters

path

a GtkTreePath

 

ancestor

another GtkTreePath

 

Returns

TRUE if ancestor contains path somewhere below it


gtk_tree_row_reference_new ()

GtkTreeRowReference *
gtk_tree_row_reference_new (GtkTreeModel *model,
                            GtkTreePath *path);

Creates a row reference based on path . This reference will keep pointing to the node pointed to by path , so long as it exists. It listens to all signals emitted by model , and updates its path appropriately. If path isn't a valid path in model , then NULL is returned.

Parameters

model

A GtkTreeModel

 

path

A valid GtkTreePath to monitor

 

Returns

A newly allocated GtkTreeRowReference, or NULL


gtk_tree_row_reference_new_proxy ()

GtkTreeRowReference *
gtk_tree_row_reference_new_proxy (GObject *proxy,
                                  GtkTreeModel *model,
                                  GtkTreePath *path);

You do not need to use this function. Creates a row reference based on path . This reference will keep pointing to the node pointed to by path , so long as it exists. If path isn't a valid path in model , then NULL is returned. However, unlike references created with gtk_tree_row_reference_new(), it does not listen to the model for changes. The creator of the row reference must do this explicitly using gtk_tree_row_reference_inserted(), gtk_tree_row_reference_deleted(), gtk_tree_row_reference_reordered().

These functions must be called exactly once per proxy when the corresponding signal on the model is emitted. This single call updates all row references for that proxy. Since built-in GTK+ objects like GtkTreeView already use this mechanism internally, using them as the proxy object will produce unpredictable results. Further more, passing the same object as model and proxy doesn't work for reasons of internal implementation.

This type of row reference is primarily meant by structures that need to carefully monitor exactly when a row reference updates itself, and is not generally needed by most applications.

Parameters

proxy

A proxy GObject

 

model

A GtkTreeModel

 

path

A valid GtkTreePath to monitor

 

Returns

A newly allocated GtkTreeRowReference, or NULL


gtk_tree_row_reference_get_model ()

GtkTreeModel *
gtk_tree_row_reference_get_model (GtkTreeRowReference *reference);

Returns the model that the row reference is monitoring.

Parameters

reference

A GtkTreeRowReference

 

Returns

the model.

[transfer none]

Since: 2.8


gtk_tree_row_reference_get_path ()

GtkTreePath *
gtk_tree_row_reference_get_path (GtkTreeRowReference *reference);

Returns a path that the row reference currently points to, or NULL if the path pointed to is no longer valid.

Parameters

reference

A GtkTreeRowReference

 

Returns

A current path, or NULL.


gtk_tree_row_reference_valid ()

gboolean
gtk_tree_row_reference_valid (GtkTreeRowReference *reference);

Returns TRUE if the reference is non-NULL and refers to a current valid path.

Parameters

reference

A GtkTreeRowReference, or NULL.

[allow-none]

Returns

TRUE if reference points to a valid path.


gtk_tree_row_reference_free ()

void
gtk_tree_row_reference_free (GtkTreeRowReference *reference);

Free's reference . reference may be NULL.

Parameters

reference

A GtkTreeRowReference, or NULL.

[allow-none]

gtk_tree_row_reference_copy ()

GtkTreeRowReference *
gtk_tree_row_reference_copy (GtkTreeRowReference *reference);

Copies a GtkTreeRowReference.

Parameters

reference

a GtkTreeRowReference

 

Returns

a copy of reference .

Since: 2.2


gtk_tree_row_reference_inserted ()

void
gtk_tree_row_reference_inserted (GObject *proxy,
                                 GtkTreePath *path);

Lets a set of row reference created by gtk_tree_row_reference_new_proxy() know that the model emitted the "row_inserted" signal.

Parameters

proxy

A GObject

 

path

The row position that was inserted

 

gtk_tree_row_reference_deleted ()

void
gtk_tree_row_reference_deleted (GObject *proxy,
                                GtkTreePath *path);

Lets a set of row reference created by gtk_tree_row_reference_new_proxy() know that the model emitted the "row_deleted" signal.

Parameters

proxy

A GObject

 

path

The path position that was deleted

 

gtk_tree_row_reference_reordered ()

void
gtk_tree_row_reference_reordered (GObject *proxy,
                                  GtkTreePath *path,
                                  GtkTreeIter *iter,
                                  gint *new_order);

Lets a set of row reference created by gtk_tree_row_reference_new_proxy() know that the model emitted the "rows_reordered" signal.

Parameters

proxy

A GObject

 

path

The parent path of the reordered signal

 

iter

The iter pointing to the parent of the reordered

 

new_order

The new order of rows

 

gtk_tree_iter_copy ()

GtkTreeIter *
gtk_tree_iter_copy (GtkTreeIter *iter);

Creates a dynamically allocated tree iterator as a copy of iter . This function is not intended for use in applications, because you can just copy the structs by value (GtkTreeIter new_iter = iter;). You must free this iter with gtk_tree_iter_free().

Parameters

iter

A GtkTreeIter.

 

Returns

a newly-allocated copy of iter .


gtk_tree_iter_free ()

void
gtk_tree_iter_free (GtkTreeIter *iter);

Frees an iterator that has been allocated by gtk_tree_iter_copy(). This function is mainly used for language bindings.

Parameters

iter

A dynamically allocated tree iterator.

 

gtk_tree_model_get_flags ()

GtkTreeModelFlags
gtk_tree_model_get_flags (GtkTreeModel *tree_model);

Returns a set of flags supported by this interface. The flags are a bitwise combination of GtkTreeModelFlags. The flags supported should not change during the lifecycle of the tree_model .

Parameters

tree_model

A GtkTreeModel.

 

Returns

The flags supported by this interface.


gtk_tree_model_get_n_columns ()

gint
gtk_tree_model_get_n_columns (GtkTreeModel *tree_model);

Returns the number of columns supported by tree_model .

Parameters

tree_model

A GtkTreeModel.

 

Returns

The number of columns.


gtk_tree_model_get_column_type ()

GType
gtk_tree_model_get_column_type (GtkTreeModel *tree_model,
                                gint index_);

Returns the type of the column.

Parameters

tree_model

A GtkTreeModel.

 

index_

The column index.

 

Returns

The type of the column.

[transfer none]


gtk_tree_model_get_iter ()

gboolean
gtk_tree_model_get_iter (GtkTreeModel *tree_model,
                         GtkTreeIter *iter,
                         GtkTreePath *path);

Sets iter to a valid iterator pointing to path .

Parameters

tree_model

A GtkTreeModel.

 

iter

The uninitialized GtkTreeIter.

[out]

path

The GtkTreePath.

 

Returns

TRUE, if iter was set.


gtk_tree_model_get_iter_from_string ()

gboolean
gtk_tree_model_get_iter_from_string (GtkTreeModel *tree_model,
                                     GtkTreeIter *iter,
                                     const gchar *path_string);

Sets iter to a valid iterator pointing to path_string , if it exists. Otherwise, iter is left invalid and FALSE is returned.

Parameters

tree_model

A GtkTreeModel.

 

iter

An uninitialized GtkTreeIter.

[out]

path_string

A string representation of a GtkTreePath.

 

Returns

TRUE, if iter was set.


gtk_tree_model_get_iter_first ()

gboolean
gtk_tree_model_get_iter_first (GtkTreeModel *tree_model,
                               GtkTreeIter *iter);

Initializes iter with the first iterator in the tree (the one at the path "0") and returns TRUE. Returns FALSE if the tree is empty.

Parameters

tree_model

A GtkTreeModel.

 

iter

The uninitialized GtkTreeIter.

[out]

Returns

TRUE, if iter was set.


gtk_tree_model_get_iter_root()

#define gtk_tree_model_get_iter_root(tree_model, iter) gtk_tree_model_get_iter_first(tree_model, iter)

gtk_tree_model_get_iter_root is deprecated and should not be used in newly-written code.

A alternate name for gtk_tree_model_get_iter_first() provided for compatibility reasons; this macro will be deprecated in future versions of GTK+.

Parameters

tree_model

A GtkTreeModel.

 

iter

uninitialized GtkTreeIter.

 

Returns

TRUE, if iter was set.


gtk_tree_model_get_path ()

GtkTreePath *
gtk_tree_model_get_path (GtkTreeModel *tree_model,
                         GtkTreeIter *iter);

Returns a newly-created GtkTreePath referenced by iter . This path should be freed with gtk_tree_path_free().

Parameters

tree_model

A GtkTreeModel.

 

iter

The GtkTreeIter.

 

Returns

a newly-created GtkTreePath.


gtk_tree_model_get_value ()

void
gtk_tree_model_get_value (GtkTreeModel *tree_model,
                          GtkTreeIter *iter,
                          gint column,
                          GValue *value);

Initializes and sets value to that at column . When done with value , g_value_unset() needs to be called to free any allocated memory.

Parameters

tree_model

A GtkTreeModel.

 

iter

The GtkTreeIter.

 

column

The column to lookup the value at.

 

value

An empty GValue to set.

[out][transfer none]

gtk_tree_model_iter_next ()

gboolean
gtk_tree_model_iter_next (GtkTreeModel *tree_model,
                          GtkTreeIter *iter);

Sets iter to point to the node following it at the current level. If there is no next iter , FALSE is returned and iter is set to be invalid.

Parameters

tree_model

A GtkTreeModel.

 

iter

The GtkTreeIter.

[in]

Returns

TRUE if iter has been changed to the next node.


gtk_tree_model_iter_children ()

gboolean
gtk_tree_model_iter_children (GtkTreeModel *tree_model,
                              GtkTreeIter *iter,
                              GtkTreeIter *parent);

Sets iter to point to the first child of parent . If parent has no children, FALSE is returned and iter is set to be invalid. parent will remain a valid node after this function has been called.

If parent is NULL returns the first node, equivalent to gtk_tree_model_get_iter_first (tree_model, iter);

Parameters

tree_model

A GtkTreeModel.

 

iter

The new GtkTreeIter to be set to the child.

[out]

parent

The GtkTreeIter, or NULL.

[allow-none]

Returns

TRUE, if child has been set to the first child.


gtk_tree_model_iter_has_child ()

gboolean
gtk_tree_model_iter_has_child (GtkTreeModel *tree_model,
                               GtkTreeIter *iter);

Returns TRUE if iter has children, FALSE otherwise.

Parameters

tree_model

A GtkTreeModel.

 

iter

The GtkTreeIter to test for children.

 

Returns

TRUE if iter has children.


gtk_tree_model_iter_n_children ()

gint
gtk_tree_model_iter_n_children (GtkTreeModel *tree_model,
                                GtkTreeIter *iter);

Returns the number of children that iter has. As a special case, if iter is NULL, then the number of toplevel nodes is returned.

Parameters

tree_model

A GtkTreeModel.

 

iter

The GtkTreeIter, or NULL.

[allow-none]

Returns

The number of children of iter .


gtk_tree_model_iter_nth_child ()

gboolean
gtk_tree_model_iter_nth_child (GtkTreeModel *tree_model,
                               GtkTreeIter *iter,
                               GtkTreeIter *parent,
                               gint n);

Sets iter to be the child of parent , using the given index. The first index is 0. If n is too big, or parent has no children, iter is set to an invalid iterator and FALSE is returned. parent will remain a valid node after this function has been called. As a special case, if parent is NULL, then the n th root node is set.

Parameters

tree_model

A GtkTreeModel.

 

iter

The GtkTreeIter to set to the nth child.

[out]

parent

The GtkTreeIter to get the child from, or NULL.

[allow-none]

n

Then index of the desired child.

 

Returns

TRUE, if parent has an n th child.


gtk_tree_model_iter_parent ()

gboolean
gtk_tree_model_iter_parent (GtkTreeModel *tree_model,
                            GtkTreeIter *iter,
                            GtkTreeIter *child);

Sets iter to be the parent of child . If child is at the toplevel, and doesn't have a parent, then iter is set to an invalid iterator and FALSE is returned. child will remain a valid node after this function has been called.

Parameters

tree_model

A GtkTreeModel

 

iter

The new GtkTreeIter to set to the parent.

[out]

child

The GtkTreeIter.

 

Returns

TRUE, if iter is set to the parent of child .


gtk_tree_model_get_string_from_iter ()

gchar *
gtk_tree_model_get_string_from_iter (GtkTreeModel *tree_model,
                                     GtkTreeIter *iter);

Generates a string representation of the iter. This string is a ':' separated list of numbers. For example, "4:10:0:3" would be an acceptable return value for this string.

Parameters

tree_model

A GtkTreeModel.

 

iter

An GtkTreeIter.

 

Returns

A newly-allocated string. Must be freed with g_free().

Since: 2.2


gtk_tree_model_ref_node ()

void
gtk_tree_model_ref_node (GtkTreeModel *tree_model,
                         GtkTreeIter *iter);

Lets the tree ref the node. This is an optional method for models to implement. To be more specific, models may ignore this call as it exists primarily for performance reasons.

This function is primarily meant as a way for views to let caching model know when nodes are being displayed (and hence, whether or not to cache that node.) For example, a file-system based model would not want to keep the entire file-hierarchy in memory, just the sections that are currently being displayed by every current view.

A model should be expected to be able to get an iter independent of its reffed state.

Parameters

tree_model

A GtkTreeModel.

 

iter

The GtkTreeIter.

 

gtk_tree_model_unref_node ()

void
gtk_tree_model_unref_node (GtkTreeModel *tree_model,
                           GtkTreeIter *iter);

Lets the tree unref the node. This is an optional method for models to implement. To be more specific, models may ignore this call as it exists primarily for performance reasons.

For more information on what this means, see gtk_tree_model_ref_node(). Please note that nodes that are deleted are not unreffed.

Parameters

tree_model

A GtkTreeModel.

 

iter

The GtkTreeIter.

 

gtk_tree_model_get ()

void
gtk_tree_model_get (GtkTreeModel *tree_model,
                    GtkTreeIter *iter,
                    ...);

Gets 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 a place to store the value being retrieved. The list is terminated by a -1. For example, to get a value from column 0 with type G_TYPE_STRING, you would write: gtk_tree_model_get (model, iter, 0, &place_string_here, -1), where place_string_here is a gchar* to be filled with the string.

Returned values with type G_TYPE_OBJECT have to be unreferenced, values with type G_TYPE_STRING or G_TYPE_BOXED have to be freed. Other values are passed by value.

Parameters

tree_model

a GtkTreeModel

 

iter

a row in tree_model

 

gtk_tree_model_get_valist ()

void
gtk_tree_model_get_valist (GtkTreeModel *tree_model,
                           GtkTreeIter *iter,
                           va_list var_args);

See gtk_tree_model_get(), this version takes a va_list for language bindings to use.

Parameters

tree_model

a GtkTreeModel

 

iter

a row in tree_model

 

var_args

va_list of column/return location pairs  

gtk_tree_model_foreach ()

void
gtk_tree_model_foreach (GtkTreeModel *model,
                        GtkTreeModelForeachFunc func,
                        gpointer user_data);

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.

Parameters

model

A GtkTreeModel

 

func

A function to be called on each row.

[scope call]

user_data

User data to passed to func.

 

gtk_tree_model_row_changed ()

void
gtk_tree_model_row_changed (GtkTreeModel *tree_model,
                            GtkTreePath *path,
                            GtkTreeIter *iter);

gtk_tree_model_row_changed is deprecated and should not be used in newly-written code.

Emits the "row-changed" signal on tree_model .

Parameters

tree_model

A GtkTreeModel

 

path

A GtkTreePath pointing to the changed row

 

iter

A valid GtkTreeIter pointing to the changed row

 

gtk_tree_model_row_inserted ()

void
gtk_tree_model_row_inserted (GtkTreeModel *tree_model,
                             GtkTreePath *path,
                             GtkTreeIter *iter);

Emits the "row-inserted" signal on tree_model

Parameters

tree_model

A GtkTreeModel

 

path

A GtkTreePath pointing to the inserted row

 

iter

A valid GtkTreeIter pointing to the inserted row

 

gtk_tree_model_row_has_child_toggled ()

void
gtk_tree_model_row_has_child_toggled (GtkTreeModel *tree_model,
                                      GtkTreePath *path,
                                      GtkTreeIter *iter);

Emits the "row-has-child-toggled" signal on tree_model . This should be called by models after the child state of a node changes.

Parameters

tree_model

A GtkTreeModel

 

path

A GtkTreePath pointing to the changed row

 

iter

A valid GtkTreeIter pointing to the changed row

 

gtk_tree_model_row_deleted ()

void
gtk_tree_model_row_deleted (GtkTreeModel *tree_model,
                            GtkTreePath *path);

Emits the "row-deleted" signal on tree_model . This should be called by models after a row has been removed. The location pointed to by path should be the location that the row previously was at. It may not be a valid location anymore.

Parameters

tree_model

A GtkTreeModel

 

path

A GtkTreePath pointing to the previous location of the deleted row.

 

gtk_tree_model_rows_reordered ()

void
gtk_tree_model_rows_reordered (GtkTreeModel *tree_model,
                               GtkTreePath *path,
                               GtkTreeIter *iter,
                               gint *new_order);

Emits the "rows-reordered" signal on tree_model . This should be called by models when their rows have been reordered.

Parameters

tree_model

A GtkTreeModel

 

path

A GtkTreePath pointing to the tree node whose children have been reordered

 

iter

A valid GtkTreeIter pointing to the node whose children have been reordered, or NULL if the depth of path is 0.

 

new_order

an array of integers mapping the current position of each child to its old position before the re-ordering, i.e. new_order [newpos] = oldpos.

 

Types and Values

GtkTreeModel

typedef struct _GtkTreeModel GtkTreeModel;


struct GtkTreeIter

struct GtkTreeIter {
  gint stamp;
  gpointer user_data;
  gpointer user_data2;
  gpointer user_data3;
};

The GtkTreeIter is the primary structure for accessing a structure. Models are expected to put a unique integer in the stamp member, and put model-specific data in the three user_data members.


GtkTreePath

typedef struct _GtkTreePath GtkTreePath;


GtkTreeRowReference

typedef struct _GtkTreeRowReference GtkTreeRowReference;


struct GtkTreeModelIface

struct GtkTreeModelIface {
  GTypeInterface g_iface;

  /* Signals */
  void         (* row_changed)           (GtkTreeModel *tree_model,
					  GtkTreePath  *path,
					  GtkTreeIter  *iter);
  void         (* row_inserted)          (GtkTreeModel *tree_model,
					  GtkTreePath  *path,
					  GtkTreeIter  *iter);
  void         (* row_has_child_toggled) (GtkTreeModel *tree_model,
					  GtkTreePath  *path,
					  GtkTreeIter  *iter);
  void         (* row_deleted)           (GtkTreeModel *tree_model,
					  GtkTreePath  *path);
  void         (* rows_reordered)        (GtkTreeModel *tree_model,
					  GtkTreePath  *path,
					  GtkTreeIter  *iter,
					  gint         *new_order);

  /* Virtual Table */
  GtkTreeModelFlags (* get_flags)  (GtkTreeModel *tree_model);

  gint         (* get_n_columns)   (GtkTreeModel *tree_model);
  GType        (* get_column_type) (GtkTreeModel *tree_model,
				    gint          index_);
  gboolean     (* get_iter)        (GtkTreeModel *tree_model,
				    GtkTreeIter  *iter,
				    GtkTreePath  *path);
  GtkTreePath *(* get_path)        (GtkTreeModel *tree_model,
				    GtkTreeIter  *iter);
  void         (* get_value)       (GtkTreeModel *tree_model,
				    GtkTreeIter  *iter,
				    gint          column,
				    GValue       *value);
  gboolean     (* iter_next)       (GtkTreeModel *tree_model,
				    GtkTreeIter  *iter);
  gboolean     (* iter_children)   (GtkTreeModel *tree_model,
				    GtkTreeIter  *iter,
				    GtkTreeIter  *parent);
  gboolean     (* iter_has_child)  (GtkTreeModel *tree_model,
				    GtkTreeIter  *iter);
  gint         (* iter_n_children) (GtkTreeModel *tree_model,
				    GtkTreeIter  *iter);
  gboolean     (* iter_nth_child)  (GtkTreeModel *tree_model,
				    GtkTreeIter  *iter,
				    GtkTreeIter  *parent,
				    gint          n);
  gboolean     (* iter_parent)     (GtkTreeModel *tree_model,
				    GtkTreeIter  *iter,
				    GtkTreeIter  *child);
  void         (* ref_node)        (GtkTreeModel *tree_model,
				    GtkTreeIter  *iter);
  void         (* unref_node)      (GtkTreeModel *tree_model,
				    GtkTreeIter  *iter);
};


enum GtkTreeModelFlags

These flags indicate various properties of a GtkTreeModel. They are returned by gtk_tree_model_get_flags(), and must be static for the lifetime of the object. A more complete description of GTK_TREE_MODEL_ITERS_PERSIST can be found in the overview of this section.

Members

GTK_TREE_MODEL_ITERS_PERSIST

Iterators survive all signals emitted by the tree.

 

GTK_TREE_MODEL_LIST_ONLY

The model is a list only, and never has children

 

Signal Details

The “row-changed” signal

void
user_function (GtkTreeModel *tree_model,
               GtkTreePath  *path,
               GtkTreeIter  *iter,
               gpointer      user_data)

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

Parameters

tree_model

the GtkTreeModel on which the signal is emitted

 

path

a GtkTreePath identifying the changed row

 

iter

a valid GtkTreeIter pointing to the changed row

 

user_data

user data set when the signal handler was connected.

 

Flags: Run Last


The “row-deleted” signal

void
user_function (GtkTreeModel *tree_model,
               GtkTreePath  *path,
               gpointer      user_data)

This signal is emitted when a row has been deleted.

Note that no iterator is passed to the signal handler, since the row is already deleted.

This should be called by models after a row has been removed. The location pointed to by path should be the location that the row previously was at. It may not be a valid location anymore.

Parameters

tree_model

the GtkTreeModel on which the signal is emitted

 

path

a GtkTreePath identifying the row

 

user_data

user data set when the signal handler was connected.

 

Flags: Run First


The “row-has-child-toggled” signal

void
user_function (GtkTreeModel *tree_model,
               GtkTreePath  *path,
               GtkTreeIter  *iter,
               gpointer      user_data)

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

Parameters

tree_model

the GtkTreeModel on which the signal is emitted

 

path

a GtkTreePath identifying the row

 

iter

a valid GtkTreeIter pointing to the row

 

user_data

user data set when the signal handler was connected.

 

Flags: Run Last


The “row-inserted” signal

void
user_function (GtkTreeModel *tree_model,
               GtkTreePath  *path,
               GtkTreeIter  *iter,
               gpointer      user_data)

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

Note that the row may still be empty at this point, since it is a common pattern to first insert an empty row, and then fill it with the desired values.

Parameters

tree_model

the GtkTreeModel on which the signal is emitted

 

path

a GtkTreePath identifying the new row

 

iter

a valid GtkTreeIter pointing to the new row

 

user_data

user data set when the signal handler was connected.

 

Flags: Run First


The “rows-reordered” signal

void
user_function (GtkTreeModel *tree_model,
               GtkTreePath  *path,
               GtkTreeIter  *iter,
               gpointer      new_order,
               gpointer      user_data)

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

Note that this signal is not emitted when rows are reordered by DND, since this is implemented by removing and then reinserting the row.

Parameters

tree_model

the GtkTreeModel on which the signal is emitted

 

path

a GtkTreePath identifying the tree node whose children have been reordered

 

iter

a valid GtkTreeIter pointing to the node whose

 

new_order

an array of integers mapping the current position of each child to its old position before the re-ordering, i.e. new_order [newpos] = oldpos.

 

user_data

user data set when the signal handler was connected.

 

Flags: Run First



[4] Here, iter is short for iterator

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