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GTK+ Reference Manual | |
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| Top | Description | Object Hierarchy | Prerequisites | Known Derived Interfaces | Known Implementations | Signals | ||||
#include <gtk/gtk.h>
GtkTreeModel;
GtkTreeIter;
GtkTreePath;
GtkTreeRowReference;
GtkTreeModelIface;
gboolean (*GtkTreeModelForeachFunc) (GtkTreeModel *model,
GtkTreePath *path,
GtkTreeIter *iter,
gpointer data);
enum GtkTreeModelFlags;
GtkTreePath * gtk_tree_path_new (void);
GtkTreePath * gtk_tree_path_new_from_string (const gchar *path);
GtkTreePath * gtk_tree_path_new_from_indices (gint first_index,
...);
gchar * gtk_tree_path_to_string (GtkTreePath *path);
GtkTreePath * gtk_tree_path_new_first (void);
#define gtk_tree_path_new_root
void gtk_tree_path_append_index (GtkTreePath *path,
gint index_);
void gtk_tree_path_prepend_index (GtkTreePath *path,
gint index_);
gint gtk_tree_path_get_depth (GtkTreePath *path);
gint * gtk_tree_path_get_indices (GtkTreePath *path);
void gtk_tree_path_free (GtkTreePath *path);
GtkTreePath * gtk_tree_path_copy (const GtkTreePath *path);
gint gtk_tree_path_compare (const GtkTreePath *a,
const GtkTreePath *b);
void gtk_tree_path_next (GtkTreePath *path);
gboolean gtk_tree_path_prev (GtkTreePath *path);
gboolean gtk_tree_path_up (GtkTreePath *path);
void gtk_tree_path_down (GtkTreePath *path);
gboolean gtk_tree_path_is_ancestor (GtkTreePath *path,
GtkTreePath *descendant);
gboolean gtk_tree_path_is_descendant (GtkTreePath *path,
GtkTreePath *ancestor);
GtkTreeRowReference * gtk_tree_row_reference_new (GtkTreeModel *model,
GtkTreePath *path);
GtkTreeRowReference * gtk_tree_row_reference_new_proxy (GObject *proxy,
GtkTreeModel *model,
GtkTreePath *path);
GtkTreeModel * gtk_tree_row_reference_get_model (GtkTreeRowReference *reference);
GtkTreePath * gtk_tree_row_reference_get_path (GtkTreeRowReference *reference);
gboolean gtk_tree_row_reference_valid (GtkTreeRowReference *reference);
void gtk_tree_row_reference_free (GtkTreeRowReference *reference);
GtkTreeRowReference * gtk_tree_row_reference_copy (GtkTreeRowReference *reference);
void gtk_tree_row_reference_inserted (GObject *proxy,
GtkTreePath *path);
void gtk_tree_row_reference_deleted (GObject *proxy,
GtkTreePath *path);
void gtk_tree_row_reference_reordered (GObject *proxy,
GtkTreePath *path,
GtkTreeIter *iter,
gint *new_order);
GtkTreeIter * gtk_tree_iter_copy (GtkTreeIter *iter);
void gtk_tree_iter_free (GtkTreeIter *iter);
GtkTreeModelFlags gtk_tree_model_get_flags (GtkTreeModel *tree_model);
gint gtk_tree_model_get_n_columns (GtkTreeModel *tree_model);
GType gtk_tree_model_get_column_type (GtkTreeModel *tree_model,
gint index_);
gboolean gtk_tree_model_get_iter (GtkTreeModel *tree_model,
GtkTreeIter *iter,
GtkTreePath *path);
gboolean gtk_tree_model_get_iter_from_string (GtkTreeModel *tree_model,
GtkTreeIter *iter,
const gchar *path_string);
gboolean gtk_tree_model_get_iter_first (GtkTreeModel *tree_model,
GtkTreeIter *iter);
#define gtk_tree_model_get_iter_root (tree_model,
iter)
GtkTreePath * gtk_tree_model_get_path (GtkTreeModel *tree_model,
GtkTreeIter *iter);
void gtk_tree_model_get_value (GtkTreeModel *tree_model,
GtkTreeIter *iter,
gint column,
GValue *value);
gboolean gtk_tree_model_iter_next (GtkTreeModel *tree_model,
GtkTreeIter *iter);
gboolean gtk_tree_model_iter_children (GtkTreeModel *tree_model,
GtkTreeIter *iter,
GtkTreeIter *parent);
gboolean gtk_tree_model_iter_has_child (GtkTreeModel *tree_model,
GtkTreeIter *iter);
gint gtk_tree_model_iter_n_children (GtkTreeModel *tree_model,
GtkTreeIter *iter);
gboolean gtk_tree_model_iter_nth_child (GtkTreeModel *tree_model,
GtkTreeIter *iter,
GtkTreeIter *parent,
gint n);
gboolean gtk_tree_model_iter_parent (GtkTreeModel *tree_model,
GtkTreeIter *iter,
GtkTreeIter *child);
gchar * gtk_tree_model_get_string_from_iter (GtkTreeModel *tree_model,
GtkTreeIter *iter);
void gtk_tree_model_ref_node (GtkTreeModel *tree_model,
GtkTreeIter *iter);
void gtk_tree_model_unref_node (GtkTreeModel *tree_model,
GtkTreeIter *iter);
void gtk_tree_model_get (GtkTreeModel *tree_model,
GtkTreeIter *iter,
...);
void gtk_tree_model_get_valist (GtkTreeModel *tree_model,
GtkTreeIter *iter,
va_list var_args);
void gtk_tree_model_foreach (GtkTreeModel *model,
GtkTreeModelForeachFunc func,
gpointer user_data);
void gtk_tree_model_row_changed (GtkTreeModel *tree_model,
GtkTreePath *path,
GtkTreeIter *iter);
void gtk_tree_model_row_inserted (GtkTreeModel *tree_model,
GtkTreePath *path,
GtkTreeIter *iter);
void gtk_tree_model_row_has_child_toggled
(GtkTreeModel *tree_model,
GtkTreePath *path,
GtkTreeIter *iter);
void gtk_tree_model_row_deleted (GtkTreeModel *tree_model,
GtkTreePath *path);
void gtk_tree_model_rows_reordered (GtkTreeModel *tree_model,
GtkTreePath *path,
GtkTreeIter *iter,
gint *new_order);
GtkTreeModel is implemented by GtkListStore, GtkTreeModelFilter, GtkTreeModelSort and GtkTreeStore.
"row-changed" : Run Last "row-deleted" : Run First "row-has-child-toggled" : Run Last "row-inserted" : Run First "rows-reordered" : Run First
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 20. Acquiring a GtkTreeIter
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 |
/* 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 21. Reading data from a GtkTreeModel
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 |
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); } } |
typedef struct {
gint stamp;
gpointer user_data;
gpointer user_data2;
gpointer user_data3;
} GtkTreeIter;
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.
typedef struct {
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);
} GtkTreeModelIface;
gboolean (*GtkTreeModelForeachFunc) (GtkTreeModel *model,GtkTreePath *path,GtkTreeIter *iter,gpointer data);
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The GtkTreeModel currently being iterated |
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The current GtkTreePath |
|
The current GtkTreeIter |
|
The user data passed to gtk_tree_model_foreach()
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Returns : |
TRUE to stop iterating, FALSE to continue.
|
typedef enum
{
GTK_TREE_MODEL_ITERS_PERSIST = 1 << 0,
GTK_TREE_MODEL_LIST_ONLY = 1 << 1
} 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.
GtkTreePath * gtk_tree_path_new (void);
Creates a new GtkTreePath. This structure refers to a row.
Returns : |
A newly created GtkTreePath. |
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.
|
The string representation of a path. |
Returns : |
A newly-created GtkTreePath, or NULL
|
GtkTreePath * gtk_tree_path_new_from_indices (gint first_index,...);
Creates a new path with first_index and varargs as indices.
|
first integer |
|
list of integers terminated by -1 |
Returns : |
A newly created GtkTreePath. |
Since 2.2
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.
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A GtkTreePath |
Returns : |
A newly-allocated string. Must be freed with g_free().
|
GtkTreePath * gtk_tree_path_new_first (void);
Creates a new GtkTreePath. The string representation of this path is "0"
Returns : |
A new GtkTreePath. |
#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. |
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.
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A GtkTreePath. |
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The 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.
|
A GtkTreePath. |
|
The index. |
gint gtk_tree_path_get_depth (GtkTreePath *path);
Returns the current depth of path.
|
A GtkTreePath. |
Returns : |
The depth of path
|
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.
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A GtkTreePath. |
Returns : |
The current indices, or NULL.
|
void gtk_tree_path_free (GtkTreePath *path);
Frees path.
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A GtkTreePath. |
GtkTreePath * gtk_tree_path_copy (const GtkTreePath *path);
Creates a new GtkTreePath as a copy of path.
|
A GtkTreePath. |
Returns : |
A new GtkTreePath. |
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.
|
A GtkTreePath. |
|
A GtkTreePath to compare with. |
Returns : |
The relative positions of a and b
|
void gtk_tree_path_next (GtkTreePath *path);
Moves the path to point to the next node at the current depth.
|
A GtkTreePath. |
gboolean gtk_tree_path_prev (GtkTreePath *path);
Moves the path to point to the previous node at the current depth,
if it exists.
|
A GtkTreePath. |
Returns : |
TRUE if path has a previous node, and the move was made.
|
gboolean gtk_tree_path_up (GtkTreePath *path);
Moves the path to point to its parent node, if it has a parent.
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A GtkTreePath. |
Returns : |
TRUE if path has a parent, and the move was made.
|
void gtk_tree_path_down (GtkTreePath *path);
Moves path to point to the first child of the current path.
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A GtkTreePath. |
gboolean gtk_tree_path_is_ancestor (GtkTreePath *path,GtkTreePath *descendant);
Returns TRUE if descendant is a descendant of path.
|
a GtkTreePath |
|
another GtkTreePath |
Returns : |
TRUE if descendant is contained inside path
|
gboolean gtk_tree_path_is_descendant (GtkTreePath *path,GtkTreePath *ancestor);
Returns TRUE if path is a descendant of ancestor.
|
a GtkTreePath |
|
another GtkTreePath |
Returns : |
TRUE if ancestor contains path somewhere below it
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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.
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A GtkTreeModel |
|
A valid GtkTreePath to monitor |
Returns : |
A newly allocated GtkTreeRowReference, or NULL
|
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.
|
A proxy GObject |
|
A GtkTreeModel |
|
A valid GtkTreePath to monitor |
Returns : |
A newly allocated GtkTreeRowReference, or NULL
|
GtkTreeModel * gtk_tree_row_reference_get_model (GtkTreeRowReference *reference);
Returns the model that the row reference is monitoring.
|
A GtkTreeRowReference |
Returns : |
the model |
Since 2.8
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.
|
A GtkTreeRowReference |
Returns : |
A current path, or NULL.
|
gboolean gtk_tree_row_reference_valid (GtkTreeRowReference *reference);
Returns TRUE if the reference is non-NULL and refers to a current valid
path.
|
A GtkTreeRowReference, or NULL. allow-none. |
Returns : |
TRUE if reference points to a valid path.
|
void gtk_tree_row_reference_free (GtkTreeRowReference *reference);
Free's reference. reference may be NULL.
|
A GtkTreeRowReference, or NULL. allow-none. |
GtkTreeRowReference * gtk_tree_row_reference_copy (GtkTreeRowReference *reference);
Copies a GtkTreeRowReference.
|
a GtkTreeRowReference |
Returns : |
a copy of reference.
|
Since 2.2
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.
|
A GObject |
|
The row position that was inserted |
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.
|
A GObject |
|
The path position that was deleted |
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.
|
A GObject |
|
The parent path of the reordered signal |
|
The iter pointing to the parent of the reordered |
|
The new order of rows |
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().
|
A GtkTreeIter. |
Returns : |
a newly-allocated copy of iter.
|
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.
|
A dynamically allocated tree iterator. |
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.
|
A GtkTreeModel. |
Returns : |
The flags supported by this interface. |
gint gtk_tree_model_get_n_columns (GtkTreeModel *tree_model);
Returns the number of columns supported by tree_model.
|
A GtkTreeModel. |
Returns : |
The number of columns. |
GType gtk_tree_model_get_column_type (GtkTreeModel *tree_model,gint index_);
Returns the type of the column.
|
A GtkTreeModel. |
|
The column index. |
Returns : |
The type of the column. |
gboolean gtk_tree_model_get_iter (GtkTreeModel *tree_model,GtkTreeIter *iter,GtkTreePath *path);
Sets iter to a valid iterator pointing to path.
|
A GtkTreeModel. |
|
The uninitialized GtkTreeIter. |
|
The GtkTreePath. |
Returns : |
TRUE, if iter was set.
|
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.
|
A GtkTreeModel. |
|
An uninitialized GtkTreeIter. |
|
A string representation of a GtkTreePath. |
Returns : |
TRUE, if iter was set.
|
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.
|
A GtkTreeModel. |
|
The uninitialized GtkTreeIter. |
Returns : |
TRUE, if iter was set.
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#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+.
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A GtkTreeModel. |
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uninitialized GtkTreeIter. |
Returns : |
TRUE, if iter was set.
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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().
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A GtkTreeModel. |
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The GtkTreeIter. |
Returns : |
a newly-created GtkTreePath. |
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.
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A GtkTreeModel. |
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The GtkTreeIter. |
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The column to lookup the value at. |
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(inout) (transfer none) An empty GValue to set. |
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.
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A GtkTreeModel. |
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The GtkTreeIter. |
Returns : |
TRUE if iter has been changed to the next node.
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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);
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A GtkTreeModel. |
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The new GtkTreeIter to be set to the child. |
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The GtkTreeIter, or NULL. allow-none. |
Returns : |
TRUE, if child has been set to the first child.
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gboolean gtk_tree_model_iter_has_child (GtkTreeModel *tree_model,GtkTreeIter *iter);
Returns TRUE if iter has children, FALSE otherwise.
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A GtkTreeModel. |
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The GtkTreeIter to test for children. |
Returns : |
TRUE if iter has children.
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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.
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A GtkTreeModel. |
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The GtkTreeIter, or NULL.. allow-none. |
Returns : |
The number of children of iter.
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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 nth root node is set.
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A GtkTreeModel. |
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The GtkTreeIter to set to the nth child. |
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The GtkTreeIter to get the child from, or NULL.. allow-none. |
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Then index of the desired child. |
Returns : |
TRUE, if parent has an nth child.
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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.
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A GtkTreeModel |
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The new GtkTreeIter to set to the parent. |
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The GtkTreeIter. |
Returns : |
TRUE, if iter is set to the parent of child.
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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.
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A GtkTreeModel. |
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An GtkTreeIter. |
Returns : |
A newly-allocated string. Must be freed with g_free().
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Since 2.2
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.
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A GtkTreeModel. |
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The GtkTreeIter. |
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.
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A GtkTreeModel. |
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The GtkTreeIter. |
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.
If appropriate, the returned values have to be freed or unreferenced.
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a GtkTreeModel |
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a row in tree_model
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pairs of column number and value return locations, terminated by -1 |
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.
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a GtkTreeModel |
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a row in tree_model
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va_list of column/return location pairs |
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.
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A GtkTreeModel |
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A function to be called on each row |
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User data to passed to func. |
void gtk_tree_model_row_changed (GtkTreeModel *tree_model,GtkTreePath *path,GtkTreeIter *iter);
Emits the "row-changed" signal on tree_model.
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A GtkTreeModel |
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A GtkTreePath pointing to the changed row |
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A valid GtkTreeIter pointing to the changed row |
void gtk_tree_model_row_inserted (GtkTreeModel *tree_model,GtkTreePath *path,GtkTreeIter *iter);
Emits the "row-inserted" signal on tree_model
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A GtkTreeModel |
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A GtkTreePath pointing to the inserted row |
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A valid GtkTreeIter pointing to the inserted row |
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.
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A GtkTreeModel |
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A GtkTreePath pointing to the changed row |
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A valid GtkTreeIter pointing to the changed row |
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.
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A GtkTreeModel |
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A GtkTreePath pointing to the previous location of the deleted row. |
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.
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A GtkTreeModel |
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A GtkTreePath pointing to the tree node whose children have been reordered |
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A valid GtkTreeIter pointing to the node whose children have been
reordered, or NULL if the depth of path is 0.
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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.
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"row-changed" signalvoid user_function (GtkTreeModel *tree_model, GtkTreePath *path, GtkTreeIter *iter, gpointer user_data) : Run Last
This signal is emitted when a row in the model has changed.
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the GtkTreeModel on which the signal is emitted |
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a GtkTreePath identifying the changed row |
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a valid GtkTreeIter pointing to the changed row |
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user data set when the signal handler was connected. |
"row-deleted" signalvoid user_function (GtkTreeModel *tree_model, GtkTreePath *path, gpointer user_data) : Run First
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.
Implementations of GtkTreeModel must emit row-deleted before removing the node from its internal data structures. This is because models and views which access and monitor this model might have references on the node which need to be released in the row-deleted handler.
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the GtkTreeModel on which the signal is emitted |
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a GtkTreePath identifying the row |
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user data set when the signal handler was connected. |
"row-has-child-toggled" signalvoid user_function (GtkTreeModel *tree_model, GtkTreePath *path, GtkTreeIter *iter, gpointer user_data) : Run Last
This signal is emitted when a row has gotten the first child row or lost its last child row.
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the GtkTreeModel on which the signal is emitted |
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a GtkTreePath identifying the row |
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a valid GtkTreeIter pointing to the row |
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user data set when the signal handler was connected. |
"row-inserted" signalvoid user_function (GtkTreeModel *tree_model, GtkTreePath *path, GtkTreeIter *iter, gpointer user_data) : Run First
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.
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the GtkTreeModel on which the signal is emitted |
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a GtkTreePath identifying the new row |
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a valid GtkTreeIter pointing to the new row |
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user data set when the signal handler was connected. |
"rows-reordered" signalvoid user_function (GtkTreeModel *tree_model, GtkTreePath *path, GtkTreeIter *iter, gpointer new_order, gpointer user_data) : Run First
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.
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the GtkTreeModel on which the signal is emitted |
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a GtkTreePath identifying the tree node whose children have been reordered |
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a valid GtkTreeIter pointing to the node whose |
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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.
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user data set when the signal handler was connected. |