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gtk/gtk/gtktreemodel.c
Christian Dywan a11e4a58c0 Clarify memory management of tree models 
It helps to be explicit about these things.
Bug 609264.
(cherry picked from commit 2a12f74c8e)
2010-08-09 23:14:14 -04:00

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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, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#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"
#include "gtkalias.h"
#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;
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.
*
* Implementations of GtkTreeModel must emit row-deleted
* <emphasis>before</emphasis> 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.
*/
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:
* @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 Operations */
GtkTreePath *
gtk_tree_path_new (void)
{
GtkTreePath *retval;
retval = g_slice_new (GtkTreePath);
retval->depth = 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
* @varargs: 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);
path->depth += 1;
path->indices = g_realloc (path->indices, path->depth * sizeof(gint));
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)
{
gint *new_indices;
(path->depth)++;
new_indices = g_new (gint, path->depth);
if (path->indices == NULL)
{
path->indices = new_indices;
path->indices[0] = index;
return;
}
memcpy (new_indices + 1, path->indices, (path->depth - 1)*sizeof (gint));
g_free (path->indices);
path->indices = new_indices;
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:
* @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.
*
* 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: Number of elements returned in the integer array
*
* 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: 2.22
**/
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: A #GtkTreePath.
*
* Frees @path.
**/
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->indices = g_new (gint, path->depth);
memcpy (retval->indices, path->indices, path->depth * sizeof (gint));
return retval;
}
GType
gtk_tree_path_get_type (void)
{
static GType our_type = 0;
if (our_type == 0)
our_type = g_boxed_type_register_static (I_("GtkTreePath"),
(GBoxedCopyFunc) gtk_tree_path_copy,
(GBoxedFreeFunc) gtk_tree_path_free);
return our_type;
}
/**
* 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);
}
GType
gtk_tree_iter_get_type (void)
{
static GType our_type = 0;
if (our_type == 0)
our_type = g_boxed_type_register_static (I_("GtkTreeIter"),
(GBoxedCopyFunc) gtk_tree_iter_copy,
(GBoxedFreeFunc) gtk_tree_iter_free);
return our_type;
}
/**
* 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 lifecycle 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.
*
* 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: An #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: (inout): 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);
}
/**
* 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: Then 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 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.
**/
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
* @Varargs: 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 = { 0, };
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 occoured
*/
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 "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 "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 "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 "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.
**/
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:
* @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 "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: 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);
GType
gtk_tree_row_reference_get_type (void)
{
static GType our_type = 0;
if (our_type == 0)
our_type = g_boxed_type_register_static (I_("GtkTreeRowReference"),
(GBoxedCopyFunc) gtk_tree_row_reference_copy,
(GBoxedFreeFunc) gtk_tree_row_reference_free);
return our_type;
}
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. 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.
*
* 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: 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 "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 "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:
* @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 "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);
}
#define __GTK_TREE_MODEL_C__
#include "gtkaliasdef.c"
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