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gtk2/gtk/gtktreemodel.c
David King c627b22126 docs: Improve GtkTreeModel iteration pattern 
Iterating over the model in this way means that use of continue is less
error-prone, as the increment is part of the loop construct.

https://bugzilla.gnome.org/show_bug.cgi?id=548793
2012-11-22 21:36:46 +00:00

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/* gtktreemodel.c
* Copyright (C) 2000 Red Hat, Inc., Jonathan Blandford <jrb@redhat.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <glib.h>
#include <glib/gprintf.h>
#include <gobject/gvaluecollector.h>
#include "gtktreemodel.h"
#include "gtktreeview.h"
#include "gtktreeprivate.h"
#include "gtkmarshalers.h"
#include "gtkintl.h"
/**
* SECTION:gtktreemodel
* @Title: GtkTreeModel
* @Short_description: The tree interface used by GtkTreeView
* @See_also: #GtkTreeView, #GtkTreeStore, #GtkListStore,
* <link linkend="gtk-GtkTreeView-drag-and-drop">GtkTreeDnd</link>,
* #GtkTreeSortable
*
* 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
* &mdash; 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<footnote><para>Here, <abbrev>iter</abbrev> is short
* for <quote>iterator</quote></para></footnote>. 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 <quote>0</quote> refers to the root
* node and the path <quote>2:4</quote> 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 <quote>3:2:5</quote>. While the first method shown is
* easier, the second is much more common, as you often get paths from
* callbacks.
*
* <example>
* <title>Acquiring a <structname>GtkTreeIter</structname></title>
* <programlisting>
* /&ast; Three ways of getting the iter pointing to the location &ast;/
* GtkTreePath *path;
* GtkTreeIter iter;
* GtkTreeIter parent_iter;
*
* /&ast; get the iterator from a string &ast;/
* gtk_tree_model_get_iter_from_string (model, &amp;iter, "3:2:5");
*
* /&ast; get the iterator from a path &ast;/
* path = gtk_tree_path_new_from_string ("3:2:5");
* gtk_tree_model_get_iter (model, &amp;iter, path);
* gtk_tree_path_free (path);
*
* /&ast; walk the tree to find the iterator &ast;/
* gtk_tree_model_iter_nth_child (model, &amp;iter, NULL, 3);
* parent_iter = iter;
* gtk_tree_model_iter_nth_child (model, &amp;iter, &amp;parent_iter, 2);
* parent_iter = iter;
* gtk_tree_model_iter_nth_child (model, &amp;iter, &amp;parent_iter, 5);
* </programlisting>
* </example>
*
* This second example shows a quick way of iterating through a list
* and getting a string and an integer from each row. The
* <function>populate_model</function> 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>
* <title>Reading data from a <structname>GtkTreeModel</structname></title>
* <programlisting>
* enum
* {
* STRING_COLUMN,
* INT_COLUMN,
* N_COLUMNS
* };
*
* ...
*
* GtkTreeModel *list_store;
* GtkTreeIter iter;
* gboolean valid;
* gint row_count = 0;
*
* /&ast; make a new list_store &ast;/
* list_store = gtk_list_store_new (N_COLUMNS, G_TYPE_STRING, G_TYPE_INT);
*
* /&ast; Fill the list store with data &ast;/
* populate_model (list_store);
*
* /&ast; Get the first iter in the list, check it is valid and walk
* &ast; through the list, reading each row. &ast;/
* for (valid = gtk_tree_model_get_iter_first (list_store, &amp;iter);
* valid;
* valid = gtk_tree_model_iter_next (list_store, &amp;iter))
* {
* gchar *str_data;
* gint int_data;
*
* /&ast; Make sure you terminate calls to gtk_tree_model_get()
* &ast; with a '-1' value
* &ast;/
* gtk_tree_model_get (list_store, &amp;iter,
* STRING_COLUMN, &amp;str_data,
* INT_COLUMN, &amp;int_data,
* -1);
*
* /&ast; Do something with the data &ast;/
* g_print ("Row &percnt;d: (&percnt;s,&percnt;d)\n", row_count, str_data, int_data);
* g_free (str_data);
*
* row_count++;
* }
* </programlisting>
* </example>
*
* The #GtkTreeModel interface contains two methods for reference
* counting: gtk_tree_model_ref_node() and gtk_tree_model_unref_node().
* These two methods are optional to implement. The reference counting
* is meant as a way for views to let models know when nodes are being
* displayed. #GtkTreeView will take a reference on a node when it is
* visible, which means the node is either in the toplevel or expanded.
* Being displayed does not mean that the node is currently directly
* visible to the user in the viewport. Based on this reference counting
* scheme a caching model, for example, can decide whether or not to cache
* a node based on the reference count. A file-system based model would
* not want to keep the entire file hierarchy in memory, but just the
* folders that are currently expanded in every current view.
*
* When working with reference counting, the following rules must be taken
* into account:
* <itemizedlist>
* <listitem><para>Never take a reference on a node without owning a
* reference on its parent. This means that all parent nodes of a referenced
* node must be referenced as well.</para></listitem>
* <listitem><para>Outstanding references on a deleted node are not released.
* This is not possible because the node has already been deleted by the
* time the row-deleted signal is received.
* </para></listitem>
* <listitem><para>Models are not obligated to emit a signal on rows of
* which none of its siblings are referenced. To phrase this differently,
* signals are only required for levels in which nodes are referenced. For
* the root level however, signals must be emitted at all times (however the
* root level is always referenced when any view is attached).
* </para></listitem>
* </itemizedlist>
*/
#define INITIALIZE_TREE_ITER(Iter) \
G_STMT_START{ \
(Iter)->stamp = 0; \
(Iter)->user_data = NULL; \
(Iter)->user_data2 = NULL; \
(Iter)->user_data3 = NULL; \
}G_STMT_END
#define ROW_REF_DATA_STRING "gtk-tree-row-refs"
enum {
ROW_CHANGED,
ROW_INSERTED,
ROW_HAS_CHILD_TOGGLED,
ROW_DELETED,
ROWS_REORDERED,
LAST_SIGNAL
};
static guint tree_model_signals[LAST_SIGNAL] = { 0 };
struct _GtkTreePath
{
gint depth; /* Number of elements */
gint alloc; /* Number of allocated elements */
gint *indices;
};
typedef struct
{
GSList *list;
} RowRefList;
static void gtk_tree_model_base_init (gpointer g_class);
/* custom closures */
static void row_inserted_marshal (GClosure *closure,
GValue /* out */ *return_value,
guint n_param_value,
const GValue *param_values,
gpointer invocation_hint,
gpointer marshal_data);
static void row_deleted_marshal (GClosure *closure,
GValue /* out */ *return_value,
guint n_param_value,
const GValue *param_values,
gpointer invocation_hint,
gpointer marshal_data);
static void rows_reordered_marshal (GClosure *closure,
GValue /* out */ *return_value,
guint n_param_value,
const GValue *param_values,
gpointer invocation_hint,
gpointer marshal_data);
static void gtk_tree_row_ref_inserted (RowRefList *refs,
GtkTreePath *path,
GtkTreeIter *iter);
static void gtk_tree_row_ref_deleted (RowRefList *refs,
GtkTreePath *path);
static void gtk_tree_row_ref_reordered (RowRefList *refs,
GtkTreePath *path,
GtkTreeIter *iter,
gint *new_order);
GType
gtk_tree_model_get_type (void)
{
static GType tree_model_type = 0;
if (! tree_model_type)
{
const GTypeInfo tree_model_info =
{
sizeof (GtkTreeModelIface), /* class_size */
gtk_tree_model_base_init, /* base_init */
NULL, /* base_finalize */
NULL,
NULL, /* class_finalize */
NULL, /* class_data */
0,
0, /* n_preallocs */
NULL
};
tree_model_type =
g_type_register_static (G_TYPE_INTERFACE, I_("GtkTreeModel"),
&tree_model_info, 0);
g_type_interface_add_prerequisite (tree_model_type, G_TYPE_OBJECT);
}
return tree_model_type;
}
static void
gtk_tree_model_base_init (gpointer g_class)
{
static gboolean initialized = FALSE;
GClosure *closure;
if (! initialized)
{
GType row_inserted_params[2];
GType row_deleted_params[1];
GType rows_reordered_params[3];
row_inserted_params[0] = GTK_TYPE_TREE_PATH | G_SIGNAL_TYPE_STATIC_SCOPE;
row_inserted_params[1] = GTK_TYPE_TREE_ITER;
row_deleted_params[0] = GTK_TYPE_TREE_PATH | G_SIGNAL_TYPE_STATIC_SCOPE;
rows_reordered_params[0] = GTK_TYPE_TREE_PATH | G_SIGNAL_TYPE_STATIC_SCOPE;
rows_reordered_params[1] = GTK_TYPE_TREE_ITER;
rows_reordered_params[2] = G_TYPE_POINTER;
/**
* GtkTreeModel::row-changed:
* @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
*
* This signal is emitted when a row in the model has changed.
*/
tree_model_signals[ROW_CHANGED] =
g_signal_new (I_("row-changed"),
GTK_TYPE_TREE_MODEL,
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GtkTreeModelIface, row_changed),
NULL, NULL,
_gtk_marshal_VOID__BOXED_BOXED,
G_TYPE_NONE, 2,
GTK_TYPE_TREE_PATH | G_SIGNAL_TYPE_STATIC_SCOPE,
GTK_TYPE_TREE_ITER);
/* We need to get notification about structure changes
* to update row references., so instead of using the
* standard g_signal_new() with an offset into our interface
* structure, we use a customs closures for the class
* closures (default handlers) that first update row references
* and then calls the function from the interface structure.
*
* The reason we don't simply update the row references from
* the wrapper functions (gtk_tree_model_row_inserted(), etc.)
* is to keep proper ordering with respect to signal handlers
* connected normally and after.
*/
/**
* GtkTreeModel::row-inserted:
* @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
*
* 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.
*/
closure = g_closure_new_simple (sizeof (GClosure), NULL);
g_closure_set_marshal (closure, row_inserted_marshal);
tree_model_signals[ROW_INSERTED] =
g_signal_newv (I_("row-inserted"),
GTK_TYPE_TREE_MODEL,
G_SIGNAL_RUN_FIRST,
closure,
NULL, NULL,
_gtk_marshal_VOID__BOXED_BOXED,
G_TYPE_NONE, 2,
row_inserted_params);
/**
* GtkTreeModel::row-has-child-toggled:
* @tree_model: the #GtkTreeModel on which the signal is emitted
* @path: a #GtkTreePath identifying the row
* @iter: a valid #GtkTreeIter pointing to the row
*
* This signal is emitted when a row has gotten the first child
* row or lost its last child row.
*/
tree_model_signals[ROW_HAS_CHILD_TOGGLED] =
g_signal_new (I_("row-has-child-toggled"),
GTK_TYPE_TREE_MODEL,
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GtkTreeModelIface, row_has_child_toggled),
NULL, NULL,
_gtk_marshal_VOID__BOXED_BOXED,
G_TYPE_NONE, 2,
GTK_TYPE_TREE_PATH | G_SIGNAL_TYPE_STATIC_SCOPE,
GTK_TYPE_TREE_ITER);
/**
* GtkTreeModel::row-deleted:
* @tree_model: the #GtkTreeModel on which the signal is emitted
* @path: a #GtkTreePath identifying the row
*
* 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.
*/
closure = g_closure_new_simple (sizeof (GClosure), NULL);
g_closure_set_marshal (closure, row_deleted_marshal);
tree_model_signals[ROW_DELETED] =
g_signal_newv (I_("row-deleted"),
GTK_TYPE_TREE_MODEL,
G_SIGNAL_RUN_FIRST,
closure,
NULL, NULL,
_gtk_marshal_VOID__BOXED,
G_TYPE_NONE, 1,
row_deleted_params);
/**
* GtkTreeModel::rows-reordered: (skip)
* @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<literal>[newpos] = oldpos</literal>
*
* This signal is emitted when the children of a node in the
* #GtkTreeModel have been reordered.
*
* Note that this signal is <emphasis>not</emphasis> emitted
* when rows are reordered by DND, since this is implemented
* by removing and then reinserting the row.
*/
closure = g_closure_new_simple (sizeof (GClosure), NULL);
g_closure_set_marshal (closure, rows_reordered_marshal);
tree_model_signals[ROWS_REORDERED] =
g_signal_newv (I_("rows-reordered"),
GTK_TYPE_TREE_MODEL,
G_SIGNAL_RUN_FIRST,
closure,
NULL, NULL,
_gtk_marshal_VOID__BOXED_BOXED_POINTER,
G_TYPE_NONE, 3,
rows_reordered_params);
initialized = TRUE;
}
}
static void
row_inserted_marshal (GClosure *closure,
GValue /* out */ *return_value,
guint n_param_values,
const GValue *param_values,
gpointer invocation_hint,
gpointer marshal_data)
{
GtkTreeModelIface *iface;
void (* row_inserted_callback) (GtkTreeModel *tree_model,
GtkTreePath *path,
GtkTreeIter *iter) = NULL;
GObject *model = g_value_get_object (param_values + 0);
GtkTreePath *path = (GtkTreePath *)g_value_get_boxed (param_values + 1);
GtkTreeIter *iter = (GtkTreeIter *)g_value_get_boxed (param_values + 2);
/* first, we need to update internal row references */
gtk_tree_row_ref_inserted ((RowRefList *)g_object_get_data (model, ROW_REF_DATA_STRING),
path, iter);
/* fetch the interface ->row_inserted implementation */
iface = GTK_TREE_MODEL_GET_IFACE (model);
row_inserted_callback = G_STRUCT_MEMBER (gpointer, iface,
G_STRUCT_OFFSET (GtkTreeModelIface,
row_inserted));
/* Call that default signal handler, it if has been set */
if (row_inserted_callback)
row_inserted_callback (GTK_TREE_MODEL (model), path, iter);
}
static void
row_deleted_marshal (GClosure *closure,
GValue /* out */ *return_value,
guint n_param_values,
const GValue *param_values,
gpointer invocation_hint,
gpointer marshal_data)
{
GtkTreeModelIface *iface;
void (* row_deleted_callback) (GtkTreeModel *tree_model,
GtkTreePath *path) = NULL;
GObject *model = g_value_get_object (param_values + 0);
GtkTreePath *path = (GtkTreePath *)g_value_get_boxed (param_values + 1);
/* first, we need to update internal row references */
gtk_tree_row_ref_deleted ((RowRefList *)g_object_get_data (model, ROW_REF_DATA_STRING),
path);
/* fetch the interface ->row_deleted implementation */
iface = GTK_TREE_MODEL_GET_IFACE (model);
row_deleted_callback = G_STRUCT_MEMBER (gpointer, iface,
G_STRUCT_OFFSET (GtkTreeModelIface,
row_deleted));
/* Call that default signal handler, it if has been set */
if (row_deleted_callback)
row_deleted_callback (GTK_TREE_MODEL (model), path);
}
static void
rows_reordered_marshal (GClosure *closure,
GValue /* out */ *return_value,
guint n_param_values,
const GValue *param_values,
gpointer invocation_hint,
gpointer marshal_data)
{
GtkTreeModelIface *iface;
void (* rows_reordered_callback) (GtkTreeModel *tree_model,
GtkTreePath *path,
GtkTreeIter *iter,
gint *new_order);
GObject *model = g_value_get_object (param_values + 0);
GtkTreePath *path = (GtkTreePath *)g_value_get_boxed (param_values + 1);
GtkTreeIter *iter = (GtkTreeIter *)g_value_get_boxed (param_values + 2);
gint *new_order = (gint *)g_value_get_pointer (param_values + 3);
/* first, we need to update internal row references */
gtk_tree_row_ref_reordered ((RowRefList *)g_object_get_data (model, ROW_REF_DATA_STRING),
path, iter, new_order);
/* fetch the interface ->rows_reordered implementation */
iface = GTK_TREE_MODEL_GET_IFACE (model);
rows_reordered_callback = G_STRUCT_MEMBER (gpointer, iface,
G_STRUCT_OFFSET (GtkTreeModelIface,
rows_reordered));
/* Call that default signal handler, it if has been set */
if (rows_reordered_callback)
rows_reordered_callback (GTK_TREE_MODEL (model), path, iter, new_order);
}
/**
* gtk_tree_path_new:
*
* Creates a new #GtkTreePath.
* This structure refers to a row.
*
* Return value: A newly created #GtkTreePath.
*/
GtkTreePath *
gtk_tree_path_new (void)
{
GtkTreePath *retval;
retval = g_slice_new (GtkTreePath);
retval->depth = 0;
retval->alloc = 0;
retval->indices = NULL;
return retval;
}
/**
* gtk_tree_path_new_from_string:
* @path: The string representation of a 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.
*
* Return value: A newly-created #GtkTreePath, or %NULL
*/
GtkTreePath *
gtk_tree_path_new_from_string (const gchar *path)
{
GtkTreePath *retval;
const gchar *orig_path = path;
gchar *ptr;
gint i;
g_return_val_if_fail (path != NULL, NULL);
g_return_val_if_fail (*path != '\000', NULL);
retval = gtk_tree_path_new ();
while (1)
{
i = strtol (path, &ptr, 10);
if (i < 0)
{
g_warning (G_STRLOC ": Negative numbers in path %s passed to gtk_tree_path_new_from_string", orig_path);
gtk_tree_path_free (retval);
return NULL;
}
gtk_tree_path_append_index (retval, i);
if (*ptr == '\000')
break;
if (ptr == path || *ptr != ':')
{
g_warning (G_STRLOC ": Invalid path %s passed to gtk_tree_path_new_from_string", orig_path);
gtk_tree_path_free (retval);
return NULL;
}
path = ptr + 1;
}
return retval;
}
/**
* gtk_tree_path_new_from_indices:
* @first_index: first integer
* @...: list of integers terminated by -1
*
* Creates a new path with @first_index and @varargs as indices.
*
* Return value: A newly created #GtkTreePath
*
* Since: 2.2
*/
GtkTreePath *
gtk_tree_path_new_from_indices (gint first_index,
...)
{
int arg;
va_list args;
GtkTreePath *path;
path = gtk_tree_path_new ();
va_start (args, first_index);
arg = first_index;
while (arg != -1)
{
gtk_tree_path_append_index (path, arg);
arg = va_arg (args, gint);
}
va_end (args);
return path;
}
/**
* gtk_tree_path_to_string:
* @path: A #GtkTreePath
*
* 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.
*
* Return value: A newly-allocated string.
* Must be freed with g_free().
*/
gchar *
gtk_tree_path_to_string (GtkTreePath *path)
{
gchar *retval, *ptr, *end;
gint i, n;
g_return_val_if_fail (path != NULL, NULL);
if (path->depth == 0)
return NULL;
n = path->depth * 12;
ptr = retval = g_new0 (gchar, n);
end = ptr + n;
g_snprintf (retval, end - ptr, "%d", path->indices[0]);
while (*ptr != '\000')
ptr++;
for (i = 1; i < path->depth; i++)
{
g_snprintf (ptr, end - ptr, ":%d", path->indices[i]);
while (*ptr != '\000')
ptr++;
}
return retval;
}
/**
* gtk_tree_path_new_first:
*
* Creates a new #GtkTreePath.
*
* The string representation of this path is "0".
*
* Return value: A new #GtkTreePath
*/
GtkTreePath *
gtk_tree_path_new_first (void)
{
GtkTreePath *retval;
retval = gtk_tree_path_new ();
gtk_tree_path_append_index (retval, 0);
return retval;
}
/**
* gtk_tree_path_append_index:
* @path: a #GtkTreePath
* @index_: the index
*
* Appends a new index to a path.
*
* As a result, the depth of the path is increased.
*/
void
gtk_tree_path_append_index (GtkTreePath *path,
gint index_)
{
g_return_if_fail (path != NULL);
g_return_if_fail (index_ >= 0);
if (path->depth == path->alloc)
{
gint *indices;
path->alloc = MAX (path->alloc * 2, 1);
indices = g_new (gint, path->alloc);
memcpy (indices, path->indices, path->depth * sizeof (gint));
g_free (path->indices);
path->indices = indices;
}
path->depth += 1;
path->indices[path->depth - 1] = index_;
}
/**
* gtk_tree_path_prepend_index:
* @path: a #GtkTreePath
* @index_: the index
*
* Prepends a new index to a path.
*
* As a result, the depth of the path is increased.
*/
void
gtk_tree_path_prepend_index (GtkTreePath *path,
gint index)
{
if (path->depth == path->alloc)
{
gint *indices;
path->alloc = MAX (path->alloc * 2, 1);
indices = g_new (gint, path->alloc);
memcpy (indices + 1, path->indices, path->depth * sizeof (gint));
g_free (path->indices);
path->indices = indices;
}
else if (path->depth > 0)
memmove (path->indices + 1, path->indices, path->depth * sizeof (gint));
path->depth += 1;
path->indices[0] = index;
}
/**
* gtk_tree_path_get_depth:
* @path: a #GtkTreePath
*
* Returns the current depth of @path.
*
* Return value: The depth of @path
*/
gint
gtk_tree_path_get_depth (GtkTreePath *path)
{
g_return_val_if_fail (path != NULL, 0);
return path->depth;
}
/**
* gtk_tree_path_get_indices: (skip)
* @path: a #GtkTreePath
*
* 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.
*
* The length of the array can be obtained with gtk_tree_path_get_depth().
*
* Return value: The current indices, or %NULL
*/
gint *
gtk_tree_path_get_indices (GtkTreePath *path)
{
g_return_val_if_fail (path != NULL, NULL);
return path->indices;
}
/**
* gtk_tree_path_get_indices_with_depth:
* @path: a #GtkTreePath
* @depth: (allow-none): return location for number of elements
* returned in the integer array, or %NULL
*
* 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.
*
* Return value: (array length=depth) (transfer none): The current
* indices, or %NULL
*
* Since: 3.0
*
* Rename to: gtk_tree_path_get_indices
*/
gint *
gtk_tree_path_get_indices_with_depth (GtkTreePath *path,
gint *depth)
{
g_return_val_if_fail (path != NULL, NULL);
if (depth)
*depth = path->depth;
return path->indices;
}
/**
* gtk_tree_path_free:
* @path: (allow-none): a #GtkTreePath
*
* Frees @path. If @path is %NULL, it simply returns.
*/
void
gtk_tree_path_free (GtkTreePath *path)
{
if (!path)
return;
g_free (path->indices);
g_slice_free (GtkTreePath, path);
}
/**
* gtk_tree_path_copy:
* @path: a #GtkTreePath
*
* Creates a new #GtkTreePath as a copy of @path.
*
* Return value: a new #GtkTreePath
*/
GtkTreePath *
gtk_tree_path_copy (const GtkTreePath *path)
{
GtkTreePath *retval;
g_return_val_if_fail (path != NULL, NULL);
retval = g_slice_new (GtkTreePath);
retval->depth = path->depth;
retval->alloc = retval->depth;
retval->indices = g_new (gint, path->alloc);
memcpy (retval->indices, path->indices, path->depth * sizeof (gint));
return retval;
}
G_DEFINE_BOXED_TYPE (GtkTreePath, gtk_tree_path,
gtk_tree_path_copy,
gtk_tree_path_free)
/**
* gtk_tree_path_compare:
* @a: a #GtkTreePath
* @b: a #GtkTreePath to compare with
*
* 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.
*
* Return value: the relative positions of @a and @b
*/
gint
gtk_tree_path_compare (const GtkTreePath *a,
const GtkTreePath *b)
{
gint p = 0, q = 0;
g_return_val_if_fail (a != NULL, 0);
g_return_val_if_fail (b != NULL, 0);
g_return_val_if_fail (a->depth > 0, 0);
g_return_val_if_fail (b->depth > 0, 0);
do
{
if (a->indices[p] == b->indices[q])
continue;
return (a->indices[p] < b->indices[q]?-1:1);
}
while (++p < a->depth && ++q < b->depth);
if (a->depth == b->depth)
return 0;
return (a->depth < b->depth?-1:1);
}
/**
* gtk_tree_path_is_ancestor:
* @path: a #GtkTreePath
* @descendant: another #GtkTreePath
*
* Returns %TRUE if @descendant is a descendant of @path.
*
* Return value: %TRUE if @descendant is contained inside @path
*/
gboolean
gtk_tree_path_is_ancestor (GtkTreePath *path,
GtkTreePath *descendant)
{
gint i;
g_return_val_if_fail (path != NULL, FALSE);
g_return_val_if_fail (descendant != NULL, FALSE);
/* can't be an ancestor if we're deeper */
if (path->depth >= descendant->depth)
return FALSE;
i = 0;
while (i < path->depth)
{
if (path->indices[i] != descendant->indices[i])
return FALSE;
++i;
}
return TRUE;
}
/**
* gtk_tree_path_is_descendant:
* @path: a #GtkTreePath
* @ancestor: another #GtkTreePath
*
* Returns %TRUE if @path is a descendant of @ancestor.
*
* Return value: %TRUE if @ancestor contains @path somewhere below it
*/
gboolean
gtk_tree_path_is_descendant (GtkTreePath *path,
GtkTreePath *ancestor)
{
gint i;
g_return_val_if_fail (path != NULL, FALSE);
g_return_val_if_fail (ancestor != NULL, FALSE);
/* can't be a descendant if we're shallower in the tree */
if (path->depth <= ancestor->depth)
return FALSE;
i = 0;
while (i < ancestor->depth)
{
if (path->indices[i] != ancestor->indices[i])
return FALSE;
++i;
}
return TRUE;
}
/**
* gtk_tree_path_next:
* @path: a #GtkTreePath
*
* Moves the @path to point to the next node at the current depth.
*/
void
gtk_tree_path_next (GtkTreePath *path)
{
g_return_if_fail (path != NULL);
g_return_if_fail (path->depth > 0);
path->indices[path->depth - 1] ++;
}
/**
* gtk_tree_path_prev:
* @path: a #GtkTreePath
*
* Moves the @path to point to the previous node at the
* current depth, if it exists.
*
* Return value: %TRUE if @path has a previous node, and
* the move was made
*/
gboolean
gtk_tree_path_prev (GtkTreePath *path)
{
g_return_val_if_fail (path != NULL, FALSE);
if (path->depth == 0)
return FALSE;
if (path->indices[path->depth - 1] == 0)
return FALSE;
path->indices[path->depth - 1] -= 1;
return TRUE;
}
/**
* gtk_tree_path_up:
* @path: a #GtkTreePath
*
* Moves the @path to point to its parent node, if it has a parent.
*
* Return value: %TRUE if @path has a parent, and the move was made
*/
gboolean
gtk_tree_path_up (GtkTreePath *path)
{
g_return_val_if_fail (path != NULL, FALSE);
if (path->depth == 0)
return FALSE;
path->depth--;
return TRUE;
}
/**
* gtk_tree_path_down:
* @path: a #GtkTreePath
*
* Moves @path to point to the first child of the current path.
*/
void
gtk_tree_path_down (GtkTreePath *path)
{
g_return_if_fail (path != NULL);
gtk_tree_path_append_index (path, 0);
}
/**
* gtk_tree_iter_copy:
* @iter: a #GtkTreeIter
*
* 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
* (<literal>GtkTreeIter new_iter = iter;</literal>).
* You must free this iter with gtk_tree_iter_free().
*
* Return value: a newly-allocated copy of @iter
*/
GtkTreeIter *
gtk_tree_iter_copy (GtkTreeIter *iter)
{
GtkTreeIter *retval;
g_return_val_if_fail (iter != NULL, NULL);
retval = g_slice_new (GtkTreeIter);
*retval = *iter;
return retval;
}
/**
* gtk_tree_iter_free:
* @iter: a dynamically allocated tree iterator
*
* Frees an iterator that has been allocated by gtk_tree_iter_copy().
*
* This function is mainly used for language bindings.
*/
void
gtk_tree_iter_free (GtkTreeIter *iter)
{
g_return_if_fail (iter != NULL);
g_slice_free (GtkTreeIter, iter);
}
G_DEFINE_BOXED_TYPE (GtkTreeIter, gtk_tree_iter,
gtk_tree_iter_copy,
gtk_tree_iter_free)
/**
* gtk_tree_model_get_flags:
* @tree_model: a #GtkTreeModel
*
* 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 lifetime
* of the @tree_model.
*
* Return value: the flags supported by this interface
*/
GtkTreeModelFlags
gtk_tree_model_get_flags (GtkTreeModel *tree_model)
{
GtkTreeModelIface *iface;
g_return_val_if_fail (GTK_IS_TREE_MODEL (tree_model), 0);
iface = GTK_TREE_MODEL_GET_IFACE (tree_model);
if (iface->get_flags)
return (* iface->get_flags) (tree_model);
return 0;
}
/**
* gtk_tree_model_get_n_columns:
* @tree_model: a #GtkTreeModel
*
* Returns the number of columns supported by @tree_model.
*
* Return value: the number of columns
*/
gint
gtk_tree_model_get_n_columns (GtkTreeModel *tree_model)
{
GtkTreeModelIface *iface;
g_return_val_if_fail (GTK_IS_TREE_MODEL (tree_model), 0);
iface = GTK_TREE_MODEL_GET_IFACE (tree_model);
g_return_val_if_fail (iface->get_n_columns != NULL, 0);
return (* iface->get_n_columns) (tree_model);
}
/**
* gtk_tree_model_get_column_type:
* @tree_model: a #GtkTreeModel
* @index_: the column index
*
* Returns the type of the column.
*
* Return value: (transfer none): the type of the column
*/
GType
gtk_tree_model_get_column_type (GtkTreeModel *tree_model,
gint index)
{
GtkTreeModelIface *iface;
g_return_val_if_fail (GTK_IS_TREE_MODEL (tree_model), G_TYPE_INVALID);
iface = GTK_TREE_MODEL_GET_IFACE (tree_model);
g_return_val_if_fail (iface->get_column_type != NULL, G_TYPE_INVALID);
g_return_val_if_fail (index >= 0, G_TYPE_INVALID);
return (* iface->get_column_type) (tree_model, index);
}
/**
* gtk_tree_model_get_iter:
* @tree_model: a #GtkTreeModel
* @iter: (out): the uninitialized #GtkTreeIter
* @path: the #GtkTreePath
*
* Sets @iter to a valid iterator pointing to @path. If @path does
* not exist, @iter is set to an invalid iterator and %FALSE is returned.
*
* Return value: %TRUE, if @iter was set
*/
gboolean
gtk_tree_model_get_iter (GtkTreeModel *tree_model,
GtkTreeIter *iter,
GtkTreePath *path)
{
GtkTreeModelIface *iface;
g_return_val_if_fail (GTK_IS_TREE_MODEL (tree_model), FALSE);
g_return_val_if_fail (iter != NULL, FALSE);
g_return_val_if_fail (path != NULL, FALSE);
iface = GTK_TREE_MODEL_GET_IFACE (tree_model);
g_return_val_if_fail (iface->get_iter != NULL, FALSE);
g_return_val_if_fail (path->depth > 0, FALSE);
INITIALIZE_TREE_ITER (iter);
return (* iface->get_iter) (tree_model, iter, path);
}
/**
* gtk_tree_model_get_iter_from_string:
* @tree_model: a #GtkTreeModel
* @iter: (out): an uninitialized #GtkTreeIter
* @path_string: a string representation of a #GtkTreePath
*
* Sets @iter to a valid iterator pointing to @path_string, if it
* exists. Otherwise, @iter is left invalid and %FALSE is returned.
*
* Return value: %TRUE, if @iter was set
*/
gboolean
gtk_tree_model_get_iter_from_string (GtkTreeModel *tree_model,
GtkTreeIter *iter,
const gchar *path_string)
{
gboolean retval;
GtkTreePath *path;
g_return_val_if_fail (GTK_IS_TREE_MODEL (tree_model), FALSE);
g_return_val_if_fail (iter != NULL, FALSE);
g_return_val_if_fail (path_string != NULL, FALSE);
path = gtk_tree_path_new_from_string (path_string);
g_return_val_if_fail (path != NULL, FALSE);
retval = gtk_tree_model_get_iter (tree_model, iter, path);
gtk_tree_path_free (path);
return retval;
}
/**
* gtk_tree_model_get_string_from_iter:
* @tree_model: a #GtkTreeModel
* @iter: a #GtkTreeIter
*
* 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.
*
* Return value: a newly-allocated string.
* Must be freed with g_free().
*
* Since: 2.2
*/
gchar *
gtk_tree_model_get_string_from_iter (GtkTreeModel *tree_model,
GtkTreeIter *iter)
{
GtkTreePath *path;
gchar *ret;
g_return_val_if_fail (GTK_IS_TREE_MODEL (tree_model), NULL);
g_return_val_if_fail (iter != NULL, NULL);
path = gtk_tree_model_get_path (tree_model, iter);
g_return_val_if_fail (path != NULL, NULL);
ret = gtk_tree_path_to_string (path);
gtk_tree_path_free (path);
return ret;
}
/**
* gtk_tree_model_get_iter_first:
* @tree_model: a #GtkTreeModel
* @iter: (out): the uninitialized #GtkTreeIter
*
* 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.
*
* Return value: %TRUE, if @iter was set
*/
gboolean
gtk_tree_model_get_iter_first (GtkTreeModel *tree_model,
GtkTreeIter *iter)
{
GtkTreePath *path;
gboolean retval;
g_return_val_if_fail (GTK_IS_TREE_MODEL (tree_model), FALSE);
g_return_val_if_fail (iter != NULL, FALSE);
path = gtk_tree_path_new_first ();
retval = gtk_tree_model_get_iter (tree_model, iter, path);
gtk_tree_path_free (path);
return retval;
}
/**
* gtk_tree_model_get_path:
* @tree_model: a #GtkTreeModel
* @iter: the #GtkTreeIter
*
* Returns a newly-created #GtkTreePath referenced by @iter.
*
* This path should be freed with gtk_tree_path_free().
*
* Return value: a newly-created #GtkTreePath
*/
GtkTreePath *
gtk_tree_model_get_path (GtkTreeModel *tree_model,
GtkTreeIter *iter)
{
GtkTreeModelIface *iface;
g_return_val_if_fail (GTK_IS_TREE_MODEL (tree_model), NULL);
g_return_val_if_fail (iter != NULL, NULL);
iface = GTK_TREE_MODEL_GET_IFACE (tree_model);
g_return_val_if_fail (iface->get_path != NULL, NULL);
return (* iface->get_path) (tree_model, iter);
}
/**
* gtk_tree_model_get_value:
* @tree_model: a #GtkTreeModel
* @iter: the #GtkTreeIter
* @column: the column to lookup the value at
* @value: (out) (transfer none): an empty #GValue to set
*
* Initializes and sets @value to that at @column.
*
* When done with @value, g_value_unset() needs to be called
* to free any allocated memory.
*/
void
gtk_tree_model_get_value (GtkTreeModel *tree_model,
GtkTreeIter *iter,
gint column,
GValue *value)
{
GtkTreeModelIface *iface;
g_return_if_fail (GTK_IS_TREE_MODEL (tree_model));
g_return_if_fail (iter != NULL);
g_return_if_fail (value != NULL);
iface = GTK_TREE_MODEL_GET_IFACE (tree_model);
g_return_if_fail (iface->get_value != NULL);
(* iface->get_value) (tree_model, iter, column, value);
}
/**
* gtk_tree_model_iter_next:
* @tree_model: a #GtkTreeModel
* @iter: (in): the #GtkTreeIter
*
* 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.
*
* Return value: %TRUE if @iter has been changed to the next node
*/
gboolean
gtk_tree_model_iter_next (GtkTreeModel *tree_model,
GtkTreeIter *iter)
{
GtkTreeModelIface *iface;
g_return_val_if_fail (GTK_IS_TREE_MODEL (tree_model), FALSE);
g_return_val_if_fail (iter != NULL, FALSE);
iface = GTK_TREE_MODEL_GET_IFACE (tree_model);
g_return_val_if_fail (iface->iter_next != NULL, FALSE);
return (* iface->iter_next) (tree_model, iter);
}
static gboolean
gtk_tree_model_iter_previous_default (GtkTreeModel *tree_model,
GtkTreeIter *iter)
{
gboolean retval;
GtkTreePath *path;
path = gtk_tree_model_get_path (tree_model, iter);
if (path == NULL)
return FALSE;
retval = gtk_tree_path_prev (path) &&
gtk_tree_model_get_iter (tree_model, iter, path);
if (retval == FALSE)
iter->stamp = 0;
gtk_tree_path_free (path);
return retval;
}
/**
* gtk_tree_model_iter_previous:
* @tree_model: a #GtkTreeModel
* @iter: (in): the #GtkTreeIter
*
* Sets @iter to point to the previous node at the current level.
*
* If there is no previous @iter, %FALSE is returned and @iter is
* set to be invalid.
*
* Return value: %TRUE if @iter has been changed to the previous node
*
* Since: 3.0
*/
gboolean
gtk_tree_model_iter_previous (GtkTreeModel *tree_model,
GtkTreeIter *iter)
{
gboolean retval;
GtkTreeModelIface *iface;
g_return_val_if_fail (GTK_IS_TREE_MODEL (tree_model), FALSE);
g_return_val_if_fail (iter != NULL, FALSE);
iface = GTK_TREE_MODEL_GET_IFACE (tree_model);
if (iface->iter_previous)
retval = (* iface->iter_previous) (tree_model, iter);
else
retval = gtk_tree_model_iter_previous_default (tree_model, iter);
return retval;
}
/**
* gtk_tree_model_iter_children:
* @tree_model: a #GtkTreeModel
* @iter: (out): the new #GtkTreeIter to be set to the child
* @parent: (allow-none): the #GtkTreeIter, or %NULL
*
* 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
* <literal>gtk_tree_model_get_iter_first (tree_model, iter);</literal>
*
* Return value: %TRUE, if @child has been set to the first child
*/
gboolean
gtk_tree_model_iter_children (GtkTreeModel *tree_model,
GtkTreeIter *iter,
GtkTreeIter *parent)
{
GtkTreeModelIface *iface;
g_return_val_if_fail (GTK_IS_TREE_MODEL (tree_model), FALSE);
g_return_val_if_fail (iter != NULL, FALSE);
iface = GTK_TREE_MODEL_GET_IFACE (tree_model);
g_return_val_if_fail (iface->iter_children != NULL, FALSE);
INITIALIZE_TREE_ITER (iter);
return (* iface->iter_children) (tree_model, iter, parent);
}
/**
* gtk_tree_model_iter_has_child:
* @tree_model: a #GtkTreeModel
* @iter: the #GtkTreeIter to test for children
*
* Returns %TRUE if @iter has children, %FALSE otherwise.
*
* Return value: %TRUE if @iter has children
*/
gboolean
gtk_tree_model_iter_has_child (GtkTreeModel *tree_model,
GtkTreeIter *iter)
{
GtkTreeModelIface *iface;
g_return_val_if_fail (GTK_IS_TREE_MODEL (tree_model), FALSE);
g_return_val_if_fail (iter != NULL, FALSE);
iface = GTK_TREE_MODEL_GET_IFACE (tree_model);
g_return_val_if_fail (iface->iter_has_child != NULL, FALSE);
return (* iface->iter_has_child) (tree_model, iter);
}
/**
* gtk_tree_model_iter_n_children:
* @tree_model: a #GtkTreeModel
* @iter: (allow-none): the #GtkTreeIter, or %NULL
*
* Returns the number of children that @iter has.
*
* As a special case, if @iter is %NULL, then the number
* of toplevel nodes is returned.
*
* Return value: the number of children of @iter
*/
gint
gtk_tree_model_iter_n_children (GtkTreeModel *tree_model,
GtkTreeIter *iter)
{
GtkTreeModelIface *iface;
g_return_val_if_fail (GTK_IS_TREE_MODEL (tree_model), 0);
iface = GTK_TREE_MODEL_GET_IFACE (tree_model);
g_return_val_if_fail (iface->iter_n_children != NULL, 0);
return (* iface->iter_n_children) (tree_model, iter);
}
/**
* gtk_tree_model_iter_nth_child:
* @tree_model: a #GtkTreeModel
* @iter: (out): the #GtkTreeIter to set to the nth child
* @parent: (allow-none): the #GtkTreeIter to get the child from, or %NULL.
* @n: the index of the desired child
*
* 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.
*
* Return value: %TRUE, if @parent has an @n<!-- -->th child
*/
gboolean
gtk_tree_model_iter_nth_child (GtkTreeModel *tree_model,
GtkTreeIter *iter,
GtkTreeIter *parent,
gint n)
{
GtkTreeModelIface *iface;
g_return_val_if_fail (GTK_IS_TREE_MODEL (tree_model), FALSE);
g_return_val_if_fail (iter != NULL, FALSE);
g_return_val_if_fail (n >= 0, FALSE);
iface = GTK_TREE_MODEL_GET_IFACE (tree_model);
g_return_val_if_fail (iface->iter_nth_child != NULL, FALSE);
INITIALIZE_TREE_ITER (iter);
return (* iface->iter_nth_child) (tree_model, iter, parent, n);
}
/**
* gtk_tree_model_iter_parent:
* @tree_model: a #GtkTreeModel
* @iter: (out): the new #GtkTreeIter to set to the parent
* @child: the #GtkTreeIter
*
* 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.
*
* Return value: %TRUE, if @iter is set to the parent of @child
*/
gboolean
gtk_tree_model_iter_parent (GtkTreeModel *tree_model,
GtkTreeIter *iter,
GtkTreeIter *child)
{
GtkTreeModelIface *iface;
g_return_val_if_fail (GTK_IS_TREE_MODEL (tree_model), FALSE);
g_return_val_if_fail (iter != NULL, FALSE);
g_return_val_if_fail (child != NULL, FALSE);
iface = GTK_TREE_MODEL_GET_IFACE (tree_model);
g_return_val_if_fail (iface->iter_parent != NULL, FALSE);
INITIALIZE_TREE_ITER (iter);
return (* iface->iter_parent) (tree_model, iter, child);
}
/**
* gtk_tree_model_ref_node:
* @tree_model: a #GtkTreeModel
* @iter: the #GtkTreeIter
*
* 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 models know when nodes are being displayed (and hence,
* whether or not to cache that node). Being displayed means a node
* is in an expanded branch, regardless of whether the node is currently
* visible in the viewport. 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.
*/
void
gtk_tree_model_ref_node (GtkTreeModel *tree_model,
GtkTreeIter *iter)
{
GtkTreeModelIface *iface;
g_return_if_fail (GTK_IS_TREE_MODEL (tree_model));
iface = GTK_TREE_MODEL_GET_IFACE (tree_model);
if (iface->ref_node)
(* iface->ref_node) (tree_model, iter);
}
/**
* gtk_tree_model_unref_node:
* @tree_model: a #GtkTreeModel
* @iter: the #GtkTreeIter
*
* 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.
*/
void
gtk_tree_model_unref_node (GtkTreeModel *tree_model,
GtkTreeIter *iter)
{
GtkTreeModelIface *iface;
g_return_if_fail (GTK_IS_TREE_MODEL (tree_model));
g_return_if_fail (iter != NULL);
iface = GTK_TREE_MODEL_GET_IFACE (tree_model);
if (iface->unref_node)
(* iface->unref_node) (tree_model, iter);
}
/**
* gtk_tree_model_get:
* @tree_model: a #GtkTreeModel
* @iter: a row in @tree_model
* @...: pairs of column number and value return locations,
* terminated by -1
*
* 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: <literal>gtk_tree_model_get (model, iter, 0, &amp;place_string_here, -1)</literal>,
* where <literal>place_string_here</literal> is a <type>gchar*</type>
* 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.
*/
void
gtk_tree_model_get (GtkTreeModel *tree_model,
GtkTreeIter *iter,
...)
{
va_list var_args;
g_return_if_fail (GTK_IS_TREE_MODEL (tree_model));
g_return_if_fail (iter != NULL);
va_start (var_args, iter);
gtk_tree_model_get_valist (tree_model, iter, var_args);
va_end (var_args);
}
/**
* gtk_tree_model_get_valist:
* @tree_model: a #GtkTreeModel
* @iter: a row in @tree_model
* @var_args: <type>va_list</type> of column/return location pairs
*
* See gtk_tree_model_get(), this version takes a <type>va_list</type>
* for language bindings to use.
*/
void
gtk_tree_model_get_valist (GtkTreeModel *tree_model,
GtkTreeIter *iter,
va_list var_args)
{
gint column;
g_return_if_fail (GTK_IS_TREE_MODEL (tree_model));
g_return_if_fail (iter != NULL);
column = va_arg (var_args, gint);
while (column != -1)
{
GValue value = G_VALUE_INIT;
gchar *error = NULL;
if (column >= gtk_tree_model_get_n_columns (tree_model))
{
g_warning ("%s: Invalid column number %d accessed (remember to end your list of columns with a -1)", G_STRLOC, column);
break;
}
gtk_tree_model_get_value (GTK_TREE_MODEL (tree_model), iter, column, &value);
G_VALUE_LCOPY (&value, var_args, 0, &error);
if (error)
{
g_warning ("%s: %s", G_STRLOC, error);
g_free (error);
/* we purposely leak the value here, it might not be
* in a sane state if an error condition occurred
*/
break;
}
g_value_unset (&value);
column = va_arg (var_args, gint);
}
}
/**
* gtk_tree_model_row_changed:
* @tree_model: a #GtkTreeModel
* @path: a #GtkTreePath pointing to the changed row
* @iter: a valid #GtkTreeIter pointing to the changed row
*
* Emits the #GtkTreeModel::row-changed signal on @tree_model.
*/
void
gtk_tree_model_row_changed (GtkTreeModel *tree_model,
GtkTreePath *path,
GtkTreeIter *iter)
{
g_return_if_fail (GTK_IS_TREE_MODEL (tree_model));
g_return_if_fail (path != NULL);
g_return_if_fail (iter != NULL);
g_signal_emit (tree_model, tree_model_signals[ROW_CHANGED], 0, path, iter);
}
/**
* gtk_tree_model_row_inserted:
* @tree_model: a #GtkTreeModel
* @path: a #GtkTreePath pointing to the inserted row
* @iter: a valid #GtkTreeIter pointing to the inserted row
*
* Emits the #GtkTreeModel::row-inserted signal on @tree_model.
*/
void
gtk_tree_model_row_inserted (GtkTreeModel *tree_model,
GtkTreePath *path,
GtkTreeIter *iter)
{
g_return_if_fail (GTK_IS_TREE_MODEL (tree_model));
g_return_if_fail (path != NULL);
g_return_if_fail (iter != NULL);
g_signal_emit (tree_model, tree_model_signals[ROW_INSERTED], 0, path, iter);
}
/**
* gtk_tree_model_row_has_child_toggled:
* @tree_model: a #GtkTreeModel
* @path: a #GtkTreePath pointing to the changed row
* @iter: a valid #GtkTreeIter pointing to the changed row
*
* Emits the #GtkTreeModel::row-has-child-toggled signal on
* @tree_model. This should be called by models after the child
* state of a node changes.
*/
void
gtk_tree_model_row_has_child_toggled (GtkTreeModel *tree_model,
GtkTreePath *path,
GtkTreeIter *iter)
{
g_return_if_fail (GTK_IS_TREE_MODEL (tree_model));
g_return_if_fail (path != NULL);
g_return_if_fail (iter != NULL);
g_signal_emit (tree_model, tree_model_signals[ROW_HAS_CHILD_TOGGLED], 0, path, iter);
}
/**
* gtk_tree_model_row_deleted:
* @tree_model: a #GtkTreeModel
* @path: a #GtkTreePath pointing to the previous location of
* the deleted row
*
* Emits the #GtkTreeModel::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.
*
* Nodes that are deleted are not unreffed, this means that any
* outstanding references on the deleted node should not be released.
*/
void
gtk_tree_model_row_deleted (GtkTreeModel *tree_model,
GtkTreePath *path)
{
g_return_if_fail (GTK_IS_TREE_MODEL (tree_model));
g_return_if_fail (path != NULL);
g_signal_emit (tree_model, tree_model_signals[ROW_DELETED], 0, path);
}
/**
* gtk_tree_model_rows_reordered: (skip)
* @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<literal>[newpos] = oldpos</literal>
*
* Emits the #GtkTreeModel::rows-reordered signal on @tree_model.
*
* This should be called by models when their rows have been
* reordered.
*/
void
gtk_tree_model_rows_reordered (GtkTreeModel *tree_model,
GtkTreePath *path,
GtkTreeIter *iter,
gint *new_order)
{
g_return_if_fail (GTK_IS_TREE_MODEL (tree_model));
g_return_if_fail (new_order != NULL);
g_signal_emit (tree_model, tree_model_signals[ROWS_REORDERED], 0, path, iter, new_order);
}
static gboolean
gtk_tree_model_foreach_helper (GtkTreeModel *model,
GtkTreeIter *iter,
GtkTreePath *path,
GtkTreeModelForeachFunc func,
gpointer user_data)
{
do
{
GtkTreeIter child;
if ((* func) (model, path, iter, user_data))
return TRUE;
if (gtk_tree_model_iter_children (model, &child, iter))
{
gtk_tree_path_down (path);
if (gtk_tree_model_foreach_helper (model, &child, path, func, user_data))
return TRUE;
gtk_tree_path_up (path);
}
gtk_tree_path_next (path);
}
while (gtk_tree_model_iter_next (model, iter));
return FALSE;
}
/**
* gtk_tree_model_foreach:
* @model: a #GtkTreeModel
* @func: (scope call): a function to be called on each row
* @user_data: user data to passed to @func
*
* Calls func on each node in model in a depth-first fashion.
*
* If @func returns %TRUE, then the tree ceases to be walked,
* and gtk_tree_model_foreach() returns.
*/
void
gtk_tree_model_foreach (GtkTreeModel *model,
GtkTreeModelForeachFunc func,
gpointer user_data)
{
GtkTreePath *path;
GtkTreeIter iter;
g_return_if_fail (GTK_IS_TREE_MODEL (model));
g_return_if_fail (func != NULL);
path = gtk_tree_path_new_first ();
if (gtk_tree_model_get_iter (model, &iter, path) == FALSE)
{
gtk_tree_path_free (path);
return;
}
gtk_tree_model_foreach_helper (model, &iter, path, func, user_data);
gtk_tree_path_free (path);
}
/*
* GtkTreeRowReference
*/
static void gtk_tree_row_reference_unref_path (GtkTreePath *path,
GtkTreeModel *model,
gint depth);
G_DEFINE_BOXED_TYPE (GtkTreeRowReference, gtk_tree_row_reference,
gtk_tree_row_reference_copy,
gtk_tree_row_reference_free)
struct _GtkTreeRowReference
{
GObject *proxy;
GtkTreeModel *model;
GtkTreePath *path;
};
static void
release_row_references (gpointer data)
{
RowRefList *refs = data;
GSList *tmp_list = NULL;
tmp_list = refs->list;
while (tmp_list != NULL)
{
GtkTreeRowReference *reference = tmp_list->data;
if (reference->proxy == (GObject *)reference->model)
reference->model = NULL;
reference->proxy = NULL;
/* we don't free the reference, users are responsible for that. */
tmp_list = g_slist_next (tmp_list);
}
g_slist_free (refs->list);
g_free (refs);
}
static void
gtk_tree_row_ref_inserted (RowRefList *refs,
GtkTreePath *path,
GtkTreeIter *iter)
{
GSList *tmp_list;
if (refs == NULL)
return;
/* This function corrects the path stored in the reference to
* account for an insertion. Note that it's called _after_ the
* insertion with the path to the newly-inserted row. Which means
* that the inserted path is in a different "coordinate system" than
* the old path (e.g. if the inserted path was just before the old
* path, then inserted path and old path will be the same, and old
* path must be moved down one).
*/
tmp_list = refs->list;
while (tmp_list != NULL)
{
GtkTreeRowReference *reference = tmp_list->data;
if (reference->path == NULL)
goto done;
if (reference->path->depth >= path->depth)
{
gint i;
gboolean ancestor = TRUE;
for (i = 0; i < path->depth - 1; i ++)
{
if (path->indices[i] != reference->path->indices[i])
{
ancestor = FALSE;
break;
}
}
if (ancestor == FALSE)
goto done;
if (path->indices[path->depth-1] <= reference->path->indices[path->depth-1])
reference->path->indices[path->depth-1] += 1;
}
done:
tmp_list = g_slist_next (tmp_list);
}
}
static void
gtk_tree_row_ref_deleted (RowRefList *refs,
GtkTreePath *path)
{
GSList *tmp_list;
if (refs == NULL)
return;
/* This function corrects the path stored in the reference to
* account for an deletion. Note that it's called _after_ the
* deletion with the old path of the just-deleted row. Which means
* that the deleted path is the same now-defunct "coordinate system"
* as the path saved in the reference, which is what we want to fix.
*/
tmp_list = refs->list;
while (tmp_list != NULL)
{
GtkTreeRowReference *reference = tmp_list->data;
if (reference->path)
{
gint i;
if (path->depth > reference->path->depth)
goto next;
for (i = 0; i < path->depth - 1; i++)
{
if (path->indices[i] != reference->path->indices[i])
goto next;
}
/* We know it affects us. */
if (path->indices[i] == reference->path->indices[i])
{
if (reference->path->depth > path->depth)
/* some parent was deleted, trying to unref any node
* between the deleted parent and the node the reference
* is pointing to is bad, as those nodes are already gone.
*/
gtk_tree_row_reference_unref_path (reference->path, reference->model, path->depth - 1);
else
gtk_tree_row_reference_unref_path (reference->path, reference->model, reference->path->depth - 1);
gtk_tree_path_free (reference->path);
reference->path = NULL;
}
else if (path->indices[i] < reference->path->indices[i])
{
reference->path->indices[path->depth-1]-=1;
}
}
next:
tmp_list = g_slist_next (tmp_list);
}
}
static void
gtk_tree_row_ref_reordered (RowRefList *refs,
GtkTreePath *path,
GtkTreeIter *iter,
gint *new_order)
{
GSList *tmp_list;
gint length;
if (refs == NULL)
return;
tmp_list = refs->list;
while (tmp_list != NULL)
{
GtkTreeRowReference *reference = tmp_list->data;
length = gtk_tree_model_iter_n_children (GTK_TREE_MODEL (reference->model), iter);
if (length < 2)
return;
if ((reference->path) &&
(gtk_tree_path_is_ancestor (path, reference->path)))
{
gint ref_depth = gtk_tree_path_get_depth (reference->path);
gint depth = gtk_tree_path_get_depth (path);
if (ref_depth > depth)
{
gint i;
gint *indices = gtk_tree_path_get_indices (reference->path);
for (i = 0; i < length; i++)
{
if (new_order[i] == indices[depth])
{
indices[depth] = i;
break;
}
}
}
}
tmp_list = g_slist_next (tmp_list);
}
}
/* We do this recursively so that we can unref children nodes
* before their parent
*/
static void
gtk_tree_row_reference_unref_path_helper (GtkTreePath *path,
GtkTreeModel *model,
GtkTreeIter *parent_iter,
gint depth,
gint current_depth)
{
GtkTreeIter iter;
if (depth == current_depth)
return;
gtk_tree_model_iter_nth_child (model, &iter, parent_iter, path->indices[current_depth]);
gtk_tree_row_reference_unref_path_helper (path, model, &iter, depth, current_depth + 1);
gtk_tree_model_unref_node (model, &iter);
}
static void
gtk_tree_row_reference_unref_path (GtkTreePath *path,
GtkTreeModel *model,
gint depth)
{
GtkTreeIter iter;
if (depth <= 0)
return;
gtk_tree_model_iter_nth_child (model, &iter, NULL, path->indices[0]);
gtk_tree_row_reference_unref_path_helper (path, model, &iter, depth, 1);
gtk_tree_model_unref_node (model, &iter);
}
/**
* gtk_tree_row_reference_new:
* @model: a #GtkTreeModel
* @path: a valid #GtkTreePath to monitor
*
* Creates a row reference based on @path.
*
* This reference will keep pointing to the node pointed to
* by @path, so long as it exists. Any changes that occur on @model are
* propagated, and the path is updated appropriately. If
* @path isn't a valid path in @model, then %NULL is returned.
*
* Return value: a newly allocated #GtkTreeRowReference, or %NULL
*/
GtkTreeRowReference *
gtk_tree_row_reference_new (GtkTreeModel *model,
GtkTreePath *path)
{
g_return_val_if_fail (GTK_IS_TREE_MODEL (model), NULL);
g_return_val_if_fail (path != NULL, NULL);
/* We use the model itself as the proxy object; and call
* gtk_tree_row_reference_inserted(), etc, in the
* class closure (default handler) marshalers for the signal.
*/
return gtk_tree_row_reference_new_proxy (G_OBJECT (model), model, path);
}
/**
* gtk_tree_row_reference_new_proxy:
* @proxy: a proxy #GObject
* @model: a #GtkTreeModel
* @path: a valid #GtkTreePath to monitor
*
* 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.
*
* Return value: a newly allocated #GtkTreeRowReference, or %NULL
*/
GtkTreeRowReference *
gtk_tree_row_reference_new_proxy (GObject *proxy,
GtkTreeModel *model,
GtkTreePath *path)
{
GtkTreeRowReference *reference;
RowRefList *refs;
GtkTreeIter parent_iter;
gint i;
g_return_val_if_fail (G_IS_OBJECT (proxy), NULL);
g_return_val_if_fail (GTK_IS_TREE_MODEL (model), NULL);
g_return_val_if_fail (path != NULL, NULL);
g_return_val_if_fail (path->depth > 0, NULL);
/* check that the path is valid */
if (gtk_tree_model_get_iter (model, &parent_iter, path) == FALSE)
return NULL;
/* Now we want to ref every node */
gtk_tree_model_iter_nth_child (model, &parent_iter, NULL, path->indices[0]);
gtk_tree_model_ref_node (model, &parent_iter);
for (i = 1; i < path->depth; i++)
{
GtkTreeIter iter;
gtk_tree_model_iter_nth_child (model, &iter, &parent_iter, path->indices[i]);
gtk_tree_model_ref_node (model, &iter);
parent_iter = iter;
}
/* Make the row reference */
reference = g_new (GtkTreeRowReference, 1);
g_object_ref (proxy);
g_object_ref (model);
reference->proxy = proxy;
reference->model = model;
reference->path = gtk_tree_path_copy (path);
refs = g_object_get_data (G_OBJECT (proxy), ROW_REF_DATA_STRING);
if (refs == NULL)
{
refs = g_new (RowRefList, 1);
refs->list = NULL;
g_object_set_data_full (G_OBJECT (proxy),
I_(ROW_REF_DATA_STRING),
refs, release_row_references);
}
refs->list = g_slist_prepend (refs->list, reference);
return reference;
}
/**
* gtk_tree_row_reference_get_path:
* @reference: a #GtkTreeRowReference
*
* Returns a path that the row reference currently points to,
* or %NULL if the path pointed to is no longer valid.
*
* Return value: a current path, or %NULL
*/
GtkTreePath *
gtk_tree_row_reference_get_path (GtkTreeRowReference *reference)
{
g_return_val_if_fail (reference != NULL, NULL);
if (reference->proxy == NULL)
return NULL;
if (reference->path == NULL)
return NULL;
return gtk_tree_path_copy (reference->path);
}
/**
* gtk_tree_row_reference_get_model:
* @reference: a #GtkTreeRowReference
*
* Returns the model that the row reference is monitoring.
*
* Return value: (transfer none): the model
*
* Since: 2.8
*/
GtkTreeModel *
gtk_tree_row_reference_get_model (GtkTreeRowReference *reference)
{
g_return_val_if_fail (reference != NULL, NULL);
return reference->model;
}
/**
* gtk_tree_row_reference_valid:
* @reference: (allow-none): a #GtkTreeRowReference, or %NULL
*
* Returns %TRUE if the @reference is non-%NULL and refers to
* a current valid path.
*
* Return value: %TRUE if @reference points to a valid path
*/
gboolean
gtk_tree_row_reference_valid (GtkTreeRowReference *reference)
{
if (reference == NULL || reference->path == NULL)
return FALSE;
return TRUE;
}
/**
* gtk_tree_row_reference_copy:
* @reference: a #GtkTreeRowReference
*
* Copies a #GtkTreeRowReference.
*
* Return value: a copy of @reference
*
* Since: 2.2
*/
GtkTreeRowReference *
gtk_tree_row_reference_copy (GtkTreeRowReference *reference)
{
return gtk_tree_row_reference_new_proxy (reference->proxy,
reference->model,
reference->path);
}
/**
* gtk_tree_row_reference_free:
* @reference: (allow-none): a #GtkTreeRowReference, or %NULL
*
* Free's @reference. @reference may be %NULL
*/
void
gtk_tree_row_reference_free (GtkTreeRowReference *reference)
{
RowRefList *refs;
if (reference == NULL)
return;
refs = g_object_get_data (G_OBJECT (reference->proxy), ROW_REF_DATA_STRING);
if (refs == NULL)
{
g_warning (G_STRLOC": bad row reference, proxy has no outstanding row references");
return;
}
refs->list = g_slist_remove (refs->list, reference);
if (refs->list == NULL)
{
g_object_set_data (G_OBJECT (reference->proxy),
I_(ROW_REF_DATA_STRING),
NULL);
}
if (reference->path)
{
gtk_tree_row_reference_unref_path (reference->path, reference->model, reference->path->depth);
gtk_tree_path_free (reference->path);
}
g_object_unref (reference->proxy);
g_object_unref (reference->model);
g_free (reference);
}
/**
* gtk_tree_row_reference_inserted:
* @proxy: a #GObject
* @path: the row position that was inserted
*
* Lets a set of row reference created by
* gtk_tree_row_reference_new_proxy() know that the
* model emitted the #GtkTreeModel::row-inserted signal.
*/
void
gtk_tree_row_reference_inserted (GObject *proxy,
GtkTreePath *path)
{
g_return_if_fail (G_IS_OBJECT (proxy));
gtk_tree_row_ref_inserted ((RowRefList *)g_object_get_data (proxy, ROW_REF_DATA_STRING), path, NULL);
}
/**
* gtk_tree_row_reference_deleted:
* @proxy: a #GObject
* @path: the path position that was deleted
*
* Lets a set of row reference created by
* gtk_tree_row_reference_new_proxy() know that the
* model emitted the #GtkTreeModel::row-deleted signal.
*/
void
gtk_tree_row_reference_deleted (GObject *proxy,
GtkTreePath *path)
{
g_return_if_fail (G_IS_OBJECT (proxy));
gtk_tree_row_ref_deleted ((RowRefList *)g_object_get_data (proxy, ROW_REF_DATA_STRING), path);
}
/**
* gtk_tree_row_reference_reordered: (skip)
* @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
*
* Lets a set of row reference created by
* gtk_tree_row_reference_new_proxy() know that the
* model emitted the #GtkTreeModel::rows-reordered signal.
*/
void
gtk_tree_row_reference_reordered (GObject *proxy,
GtkTreePath *path,
GtkTreeIter *iter,
gint *new_order)
{
g_return_if_fail (G_IS_OBJECT (proxy));
gtk_tree_row_ref_reordered ((RowRefList *)g_object_get_data (proxy, ROW_REF_DATA_STRING), path, iter, new_order);
}
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