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gtk2/gtk/gtktreemodelfilter.c
Kristian Rietveld 584ff7c29a treemodelfilter: eliminate unread variable assigments 
Courtesy of scan-build/clang.
2011-08-22 21:30:35 +02:00

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/* gtktreemodelfilter.c
* Copyright (C) 2000,2001 Red Hat, Inc., Jonathan Blandford <jrb@redhat.com>
* Copyright (C) 2001-2003 Kristian Rietveld <kris@gtk.org>
*
* 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 "gtktreemodelfilter.h"
#include "gtkintl.h"
#include "gtktreednd.h"
#include "gtkprivate.h"
#include <string.h>
/**
* SECTION:gtktreemodelfilter
* @Short_description: A GtkTreeModel which hides parts of an underlying tree model
* @Title: GtkTreeModelFilter
* @See_also:#GtkTreeModelSort
*
* A #GtkTreeModelFilter is a tree model which wraps another tree model,
* and can do the following things:
* <itemizedlist>
* <listitem><para>
* Filter specific rows, based on data from a "visible column", a column
* storing booleans indicating whether the row should be filtered or not,
* or based on the return value of a "visible function", which gets a
* model, iter and user_data and returns a boolean indicating whether the
* row should be filtered or not.
* </para></listitem>
* <listitem><para>
* Modify the "appearance" of the model, using a modify function.
* This is extremely powerful and allows for just changing
* some values and also for creating a completely different model based on
* the given child model.
* </para></listitem>
* <listitem><para>
* Set a different root node, also known as a "virtual root". You can pass in
* a #GtkTreePath indicating the root node for the filter at construction time.
* </para></listitem>
* </itemizedlist>
*
* The basic API is similar to #GtkTreeModelSort. For an example on its usage,
* see the section on #GtkTreeModelSort.
*
* When using #GtkTreeModelFilter, it is important to realize that
* #GtkTreeModelFilter maintains an internal cache of all nodes which are
* visible in its clients. The cache is likely to be a subtree of the tree
* exposed by the child model. #GtkTreeModelFilter will not cache the entire
* child model when unnecessary to not compromise the caching mechanism
* that is exposed by the reference counting scheme. If the child model
* implements reference counting, unnecessary signals may not be emitted
* because of reference counting rule 3, see the #GtkTreeModel
* documentation. (Note that e.g. #GtkTreeStore does not implement
* reference counting and will always emit all signals, even when
* the receiving node is not visible).
*
* Because of this, limitations for possible visible functions do apply.
* In general, visible functions should only use data or properties from
* the node for which the visibility state must be determined, its siblings
* or its parents. Usually, having a dependency on the state of any child
* node is not possible, unless references are taken on these explicitly.
* When no such reference exists, no signals may be received for these child
* nodes (see reference couting rule number 3 in the #GtkTreeModel section).
*
* Determining the visibility state of a given node based on the state
* of its child nodes is a frequently occurring use case. Therefore,
* #GtkTreeModelFilter explicitly supports this. For example, when a node
* does not have any children, you might not want the node to be visible.
* As soon as the first row is added to the node's child level (or the
* last row removed), the node's visibility should be updated.
*
* This introduces a dependency from the node on its child nodes. In order
* to accommodate this, #GtkTreeModelFilter must make sure the necesary
* signals are received from the child model. This is achieved by building,
* for all nodes which are exposed as visible nodes to #GtkTreeModelFilter's
* clients, the child level (if any) and take a reference on the first node
* in this level. Furthermore, for every row-inserted, row-changed or
* row-deleted signal (also these which were not handled because the node
* was not cached), #GtkTreeModelFilter will check if the visibility state
* of any parent node has changed.
*
* Beware, however, that this explicit support is limited to these two
* cases. For example, if you want a node to be visible only if two nodes
* in a child's child level (2 levels deeper) are visible, you are on your
* own. In this case, either rely on #GtkTreeStore to emit all signals
* because it does not implement reference counting, or for models that
* do implement reference counting, obtain references on these child levels
* yourself.
*/
/* Notes on this implementation of GtkTreeModelFilter
* ==================================================
*
* Warnings
* --------
*
* In this code there is a potential for confusion as to whether an iter,
* path or value refers to the GtkTreeModelFilter model, or to the child
* model that has been set. As a convention, variables referencing the
* child model will have a c_ prefix before them (ie. c_iter, c_value,
* c_path). In case the c_ prefixed names are already in use, an f_
* prefix is used. Conversion of iterators and paths between
* GtkTreeModelFilter and the child model is done through the various
* gtk_tree_model_filter_convert_* functions.
*
* Even though the GtkTreeModelSort and GtkTreeModelFilter have very
* similar data structures, many assumptions made in the GtkTreeModelSort
* code do *not* apply in the GtkTreeModelFilter case. Reference counting
* in particular is more complicated in GtkTreeModelFilter, because
* we explicitly support reliance on the state of a node's children as
* outlined in the public API documentation. Because of these differences,
* you are strongly recommended to first read through these notes before
* making any modification to the code.
*
* Iterator format
* ---------------
*
* The iterator format of iterators handed out by GtkTreeModelFilter is
* as follows:
*
* iter->stamp = filter->priv->stamp
* iter->user_data = FilterLevel
* iter->user_data2 = FilterElt
*
* Internal data structure
* -----------------------
*
* Using FilterLevel and FilterElt, GtkTreeModelFilter maintains a "cache"
* of the mapping from GtkTreeModelFilter nodes to nodes in the child model.
* This is to avoid re-creating a level each time (which involves computing
* visibility for each node in that level) an operation is requested on
* GtkTreeModelFilter, such as get iter, get path and get value.
*
* A FilterElt corresponds to a single node. The FilterElt can either be
* visible or invisible in the model that is exposed to the clients of this
* GtkTreeModelFilter. The visibility state is stored in the "visible_siter"
* field, which is NULL when the node is not visible. The FilterLevel keeps
* a reference to the parent FilterElt and its FilterLevel (if any). The
* FilterElt can have a "children" pointer set, which points at a child
* level (a sub level).
*
* In a FilterLevel, two separate GSequences are maintained. One contains
* all nodes of this FilterLevel, regardless of the visibility state of
* the node. Another contains only visible nodes. A visible FilterElt
* is thus present in both the full and the visible GSequence. The
* GSequence allows for fast access, addition and removal of nodes.
*
* It is important to recognize the two different mappings that play
* a part in this code:
* I. The mapping from the client to this model. The order in which
* nodes are stored in the *visible* GSequence is the order in
* which the nodes are exposed to clients of the GtkTreeModelFilter.
* II. The mapping from this model to its child model. Each FilterElt
* contains an "offset" field which is the offset of the
* corresponding node in the child model.
*
* Throughout the code, two kinds of paths relative to the GtkTreeModelFilter
* (those generated from the sequence positions) are used. There are paths
* which take non-visible nodes into account (generated from the full
* sequences) and paths which don't (generated from the visible sequences).
* Paths which have been generated from the full sequences should only be
* used internally and NEVER be passed along with a signal emisson.
*
* Reference counting
* ------------------
*
* GtkTreeModelFilter forwards all reference and unreference operations
* to the corresponding node in the child model. In addition,
* GtkTreeModelFilter will also add references of its own. The full reference
* count of each node (i.e. all forwarded references and these by the
* filter model) is maintained internally in the "ref_count" fields in
* FilterElt and FilterLevel. Because there is a need to determine whether
* a node should be visible for the client, the reference count of only
* the forwarded references is maintained as well, in the "ext_ref_count"
* fields.
*
* In a few cases, GtkTreeModelFilter takes additional references on
* nodes. The first case is that a reference is taken on the parent
* (if any) of each level. This happens in gtk_tree_model_filter_build_level()
* and the reference is released again in gtk_tree_model_filter_free_level().
* This ensures that for all references which are taken by the filter
* model, all parent nodes are referenced according to reference counting
* rule 1 in the GtkTreeModel documentation.
*
* A second case is required to support visible functions which depend on
* the state of a node's children (see the public API documentation for
* GtkTreeModelFilter above). We build the child level of each node that
* could be visible in the client (i.e. the level has an ext_ref_count > 0;
* not the elt, because the elt might be invisible and thus unreferenced
* by the client). For each node that becomes visible, due to insertion or
* changes in visibility state, it is checked whether node has children, if
* so the child level is built.
*
* A reference is taken on the first node of each level so that the child
* model will emit all signals for this level, due to reference counting
* rule 3 in the GtkTreeModel documentation. If due to changes in the level,
* another node becomes the first node (e.g. due to insertion or reordering),
* this reference is transferred from the old to the new first node.
*
* When a level has an *external* reference count of zero (which means that
* none of the nodes in the level is referenced by the clients), the level
* has a "zero ref count" on all its parents. As soon as the level reaches
* an *external* reference count of zero, the zero ref count value is
* incremented by one for all parents of this level. Due to the additional
* references taken by the filter model, it is important to base the
* zero ref count on the external reference count instead of on the full
* reference count of the node.
*
* The zero ref count value aids in determining which portions of the
* cache are possibly unused and could be removed. If a FilterElt has
* a zero ref count of one, then its child level is unused. However, the
* child level can only be removed from the cache if the FilterElt's
* parent has an external ref count of zero. Otherwise, monitoring
* this level is necessary to possibly update the visibility state
* of the parent. This is an important difference from GtkTreeModelSort!
*
* Signals are only required for levels with an external ref count > 0.
* This due to reference counting rule 3, see the GtkTreeModel
* documentation. In the GtkTreeModelFilter we try hard to stick to this
* rule and not emit redundant signals (though redundant emissions of
* row-has-child-toggled could appear frequently; it does happen that
* we simply forward the signal emitted by e.g. GtkTreeStore but also
* emit our own copy).
*/
typedef struct _FilterElt FilterElt;
typedef struct _FilterLevel FilterLevel;
struct _FilterElt
{
GtkTreeIter iter;
FilterLevel *children;
gint offset;
gint ref_count;
gint ext_ref_count;
gint zero_ref_count;
GSequenceIter *visible_siter; /* iter into visible_seq */
};
struct _FilterLevel
{
GSequence *seq;
GSequence *visible_seq;
gint ref_count;
gint ext_ref_count;
FilterElt *parent_elt;
FilterLevel *parent_level;
};
struct _GtkTreeModelFilterPrivate
{
GtkTreeModel *child_model;
gpointer root;
GtkTreePath *virtual_root;
gint stamp;
guint child_flags;
gint zero_ref_count;
gint visible_column;
GtkTreeModelFilterVisibleFunc visible_func;
gpointer visible_data;
GDestroyNotify visible_destroy;
GType *modify_types;
GtkTreeModelFilterModifyFunc modify_func;
gpointer modify_data;
GDestroyNotify modify_destroy;
gint modify_n_columns;
guint visible_method_set : 1;
guint modify_func_set : 1;
guint in_row_deleted : 1;
guint virtual_root_deleted : 1;
/* signal ids */
gulong changed_id;
gulong inserted_id;
gulong has_child_toggled_id;
gulong deleted_id;
gulong reordered_id;
};
/* properties */
enum
{
PROP_0,
PROP_CHILD_MODEL,
PROP_VIRTUAL_ROOT
};
/* Set this to 0 to disable caching of child iterators. This
* allows for more stringent testing. It is recommended to set this
* to one when refactoring this code and running the unit tests to
* catch more errors.
*/
#if 1
# define GTK_TREE_MODEL_FILTER_CACHE_CHILD_ITERS(filter) \
(((GtkTreeModelFilter *)filter)->priv->child_flags & GTK_TREE_MODEL_ITERS_PERSIST)
#else
# define GTK_TREE_MODEL_FILTER_CACHE_CHILD_ITERS(filter) (FALSE)
#endif
#define FILTER_ELT(filter_elt) ((FilterElt *)filter_elt)
#define FILTER_LEVEL(filter_level) ((FilterLevel *)filter_level)
#define GET_ELT(siter) ((FilterElt*) (siter ? g_sequence_get (siter) : NULL))
/* general code (object/interface init, properties, etc) */
static void gtk_tree_model_filter_tree_model_init (GtkTreeModelIface *iface);
static void gtk_tree_model_filter_drag_source_init (GtkTreeDragSourceIface *iface);
static void gtk_tree_model_filter_finalize (GObject *object);
static void gtk_tree_model_filter_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void gtk_tree_model_filter_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
/* signal handlers */
static void gtk_tree_model_filter_row_changed (GtkTreeModel *c_model,
GtkTreePath *c_path,
GtkTreeIter *c_iter,
gpointer data);
static void gtk_tree_model_filter_row_inserted (GtkTreeModel *c_model,
GtkTreePath *c_path,
GtkTreeIter *c_iter,
gpointer data);
static void gtk_tree_model_filter_row_has_child_toggled (GtkTreeModel *c_model,
GtkTreePath *c_path,
GtkTreeIter *c_iter,
gpointer data);
static void gtk_tree_model_filter_row_deleted (GtkTreeModel *c_model,
GtkTreePath *c_path,
gpointer data);
static void gtk_tree_model_filter_rows_reordered (GtkTreeModel *c_model,
GtkTreePath *c_path,
GtkTreeIter *c_iter,
gint *new_order,
gpointer data);
/* GtkTreeModel interface */
static GtkTreeModelFlags gtk_tree_model_filter_get_flags (GtkTreeModel *model);
static gint gtk_tree_model_filter_get_n_columns (GtkTreeModel *model);
static GType gtk_tree_model_filter_get_column_type (GtkTreeModel *model,
gint index);
static gboolean gtk_tree_model_filter_get_iter_full (GtkTreeModel *model,
GtkTreeIter *iter,
GtkTreePath *path);
static gboolean gtk_tree_model_filter_get_iter (GtkTreeModel *model,
GtkTreeIter *iter,
GtkTreePath *path);
static GtkTreePath *gtk_tree_model_filter_get_path (GtkTreeModel *model,
GtkTreeIter *iter);
static void gtk_tree_model_filter_get_value (GtkTreeModel *model,
GtkTreeIter *iter,
gint column,
GValue *value);
static gboolean gtk_tree_model_filter_iter_next (GtkTreeModel *model,
GtkTreeIter *iter);
static gboolean gtk_tree_model_filter_iter_previous (GtkTreeModel *model,
GtkTreeIter *iter);
static gboolean gtk_tree_model_filter_iter_children (GtkTreeModel *model,
GtkTreeIter *iter,
GtkTreeIter *parent);
static gboolean gtk_tree_model_filter_iter_has_child (GtkTreeModel *model,
GtkTreeIter *iter);
static gint gtk_tree_model_filter_iter_n_children (GtkTreeModel *model,
GtkTreeIter *iter);
static gboolean gtk_tree_model_filter_iter_nth_child (GtkTreeModel *model,
GtkTreeIter *iter,
GtkTreeIter *parent,
gint n);
static gboolean gtk_tree_model_filter_iter_parent (GtkTreeModel *model,
GtkTreeIter *iter,
GtkTreeIter *child);
static void gtk_tree_model_filter_ref_node (GtkTreeModel *model,
GtkTreeIter *iter);
static void gtk_tree_model_filter_unref_node (GtkTreeModel *model,
GtkTreeIter *iter);
/* TreeDragSource interface */
static gboolean gtk_tree_model_filter_row_draggable (GtkTreeDragSource *drag_source,
GtkTreePath *path);
static gboolean gtk_tree_model_filter_drag_data_get (GtkTreeDragSource *drag_source,
GtkTreePath *path,
GtkSelectionData *selection_data);
static gboolean gtk_tree_model_filter_drag_data_delete (GtkTreeDragSource *drag_source,
GtkTreePath *path);
/* private functions */
static void gtk_tree_model_filter_build_level (GtkTreeModelFilter *filter,
FilterLevel *parent_level,
FilterElt *parent_elt,
gboolean emit_inserted);
static void gtk_tree_model_filter_free_level (GtkTreeModelFilter *filter,
FilterLevel *filter_level,
gboolean unref);
static GtkTreePath *gtk_tree_model_filter_elt_get_path (FilterLevel *level,
FilterElt *elt,
GtkTreePath *root);
static GtkTreePath *gtk_tree_model_filter_add_root (GtkTreePath *src,
GtkTreePath *root);
static GtkTreePath *gtk_tree_model_filter_remove_root (GtkTreePath *src,
GtkTreePath *root);
static void gtk_tree_model_filter_increment_stamp (GtkTreeModelFilter *filter);
static void gtk_tree_model_filter_real_modify (GtkTreeModelFilter *self,
GtkTreeModel *child_model,
GtkTreeIter *iter,
GValue *value,
gint column);
static gboolean gtk_tree_model_filter_real_visible (GtkTreeModelFilter *filter,
GtkTreeModel *child_model,
GtkTreeIter *child_iter);
static gboolean gtk_tree_model_filter_visible (GtkTreeModelFilter *filter,
GtkTreeIter *child_iter);
static void gtk_tree_model_filter_clear_cache_helper (GtkTreeModelFilter *filter,
FilterLevel *level);
static void gtk_tree_model_filter_real_ref_node (GtkTreeModel *model,
GtkTreeIter *iter,
gboolean external);
static void gtk_tree_model_filter_real_unref_node (GtkTreeModel *model,
GtkTreeIter *iter,
gboolean external,
gboolean propagate_unref);
static void gtk_tree_model_filter_set_model (GtkTreeModelFilter *filter,
GtkTreeModel *child_model);
static void gtk_tree_model_filter_ref_path (GtkTreeModelFilter *filter,
GtkTreePath *path);
static void gtk_tree_model_filter_unref_path (GtkTreeModelFilter *filter,
GtkTreePath *path,
int depth);
static void gtk_tree_model_filter_set_root (GtkTreeModelFilter *filter,
GtkTreePath *root);
static GtkTreePath *gtk_real_tree_model_filter_convert_child_path_to_path (GtkTreeModelFilter *filter,
GtkTreePath *child_path,
gboolean build_levels,
gboolean fetch_children);
static gboolean gtk_tree_model_filter_elt_is_visible_in_target (FilterLevel *level,
FilterElt *elt);
static FilterElt *gtk_tree_model_filter_insert_elt_in_level (GtkTreeModelFilter *filter,
GtkTreeIter *c_iter,
FilterLevel *level,
gint offset,
gint *index);
static FilterElt *gtk_tree_model_filter_fetch_child (GtkTreeModelFilter *filter,
FilterLevel *level,
gint offset,
gint *index);
static void gtk_tree_model_filter_remove_elt_from_level (GtkTreeModelFilter *filter,
FilterLevel *level,
FilterElt *elt);
static void gtk_tree_model_filter_update_children (GtkTreeModelFilter *filter,
FilterLevel *level,
FilterElt *elt);
static void gtk_tree_model_filter_emit_row_inserted_for_path (GtkTreeModelFilter *filter,
GtkTreeModel *c_model,
GtkTreePath *c_path,
GtkTreeIter *c_iter);
G_DEFINE_TYPE_WITH_CODE (GtkTreeModelFilter, gtk_tree_model_filter, G_TYPE_OBJECT,
G_IMPLEMENT_INTERFACE (GTK_TYPE_TREE_MODEL,
gtk_tree_model_filter_tree_model_init)
G_IMPLEMENT_INTERFACE (GTK_TYPE_TREE_DRAG_SOURCE,
gtk_tree_model_filter_drag_source_init))
static void
gtk_tree_model_filter_init (GtkTreeModelFilter *filter)
{
filter->priv = G_TYPE_INSTANCE_GET_PRIVATE (filter,
GTK_TYPE_TREE_MODEL_FILTER,
GtkTreeModelFilterPrivate);
filter->priv->visible_column = -1;
filter->priv->zero_ref_count = 0;
filter->priv->visible_method_set = FALSE;
filter->priv->modify_func_set = FALSE;
filter->priv->in_row_deleted = FALSE;
filter->priv->virtual_root_deleted = FALSE;
}
static void
gtk_tree_model_filter_class_init (GtkTreeModelFilterClass *filter_class)
{
GObjectClass *object_class;
object_class = (GObjectClass *) filter_class;
object_class->set_property = gtk_tree_model_filter_set_property;
object_class->get_property = gtk_tree_model_filter_get_property;
object_class->finalize = gtk_tree_model_filter_finalize;
filter_class->visible = gtk_tree_model_filter_real_visible;
filter_class->modify = gtk_tree_model_filter_real_modify;
/* Properties -- FIXME: disabled translations for now, until I can come up with a
* better description
*/
g_object_class_install_property (object_class,
PROP_CHILD_MODEL,
g_param_spec_object ("child-model",
("The child model"),
("The model for the filtermodel to filter"),
GTK_TYPE_TREE_MODEL,
GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
g_object_class_install_property (object_class,
PROP_VIRTUAL_ROOT,
g_param_spec_boxed ("virtual-root",
("The virtual root"),
("The virtual root (relative to the child model) for this filtermodel"),
GTK_TYPE_TREE_PATH,
GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
g_type_class_add_private (object_class, sizeof (GtkTreeModelFilterPrivate));
}
static void
gtk_tree_model_filter_tree_model_init (GtkTreeModelIface *iface)
{
iface->get_flags = gtk_tree_model_filter_get_flags;
iface->get_n_columns = gtk_tree_model_filter_get_n_columns;
iface->get_column_type = gtk_tree_model_filter_get_column_type;
iface->get_iter = gtk_tree_model_filter_get_iter;
iface->get_path = gtk_tree_model_filter_get_path;
iface->get_value = gtk_tree_model_filter_get_value;
iface->iter_next = gtk_tree_model_filter_iter_next;
iface->iter_previous = gtk_tree_model_filter_iter_previous;
iface->iter_children = gtk_tree_model_filter_iter_children;
iface->iter_has_child = gtk_tree_model_filter_iter_has_child;
iface->iter_n_children = gtk_tree_model_filter_iter_n_children;
iface->iter_nth_child = gtk_tree_model_filter_iter_nth_child;
iface->iter_parent = gtk_tree_model_filter_iter_parent;
iface->ref_node = gtk_tree_model_filter_ref_node;
iface->unref_node = gtk_tree_model_filter_unref_node;
}
static void
gtk_tree_model_filter_drag_source_init (GtkTreeDragSourceIface *iface)
{
iface->row_draggable = gtk_tree_model_filter_row_draggable;
iface->drag_data_delete = gtk_tree_model_filter_drag_data_delete;
iface->drag_data_get = gtk_tree_model_filter_drag_data_get;
}
static void
gtk_tree_model_filter_finalize (GObject *object)
{
GtkTreeModelFilter *filter = (GtkTreeModelFilter *) object;
if (filter->priv->virtual_root && !filter->priv->virtual_root_deleted)
{
gtk_tree_model_filter_unref_path (filter, filter->priv->virtual_root,
-1);
filter->priv->virtual_root_deleted = TRUE;
}
gtk_tree_model_filter_set_model (filter, NULL);
if (filter->priv->virtual_root)
gtk_tree_path_free (filter->priv->virtual_root);
if (filter->priv->root)
gtk_tree_model_filter_free_level (filter, filter->priv->root, TRUE);
g_free (filter->priv->modify_types);
if (filter->priv->modify_destroy)
filter->priv->modify_destroy (filter->priv->modify_data);
if (filter->priv->visible_destroy)
filter->priv->visible_destroy (filter->priv->visible_data);
/* must chain up */
G_OBJECT_CLASS (gtk_tree_model_filter_parent_class)->finalize (object);
}
static void
gtk_tree_model_filter_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GtkTreeModelFilter *filter = GTK_TREE_MODEL_FILTER (object);
switch (prop_id)
{
case PROP_CHILD_MODEL:
gtk_tree_model_filter_set_model (filter, g_value_get_object (value));
break;
case PROP_VIRTUAL_ROOT:
gtk_tree_model_filter_set_root (filter, g_value_get_boxed (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_tree_model_filter_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GtkTreeModelFilter *filter = GTK_TREE_MODEL_FILTER (object);
switch (prop_id)
{
case PROP_CHILD_MODEL:
g_value_set_object (value, filter->priv->child_model);
break;
case PROP_VIRTUAL_ROOT:
g_value_set_boxed (value, filter->priv->virtual_root);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/* helpers */
static FilterElt *
filter_elt_new (void)
{
return g_slice_new (FilterElt);
}
static void
filter_elt_free (gpointer elt)
{
g_slice_free (FilterElt, elt);
}
static gint
filter_elt_cmp (gconstpointer a,
gconstpointer b,
gpointer user_data)
{
const FilterElt *elt_a = a;
const FilterElt *elt_b = b;
if (elt_a->offset > elt_b->offset)
return +1;
else if (elt_a->offset < elt_b->offset)
return -1;
else
return 0;
}
static FilterElt *
lookup_elt_with_offset (GSequence *seq,
gint offset,
GSequenceIter **ret_siter)
{
GSequenceIter *siter;
FilterElt dummy;
dummy.offset = offset;
siter = g_sequence_lookup (seq, &dummy, filter_elt_cmp, NULL);
if (ret_siter)
*ret_siter = siter;
return GET_ELT (siter);
}
static void
increase_offset_iter (gpointer data,
gpointer user_data)
{
FilterElt *elt = data;
gint offset = GPOINTER_TO_INT (user_data);
if (elt->offset >= offset)
elt->offset++;
}
static void
decrease_offset_iter (gpointer data,
gpointer user_data)
{
FilterElt *elt = data;
gint offset = GPOINTER_TO_INT (user_data);
if (elt->offset > offset)
elt->offset--;
}
static void
gtk_tree_model_filter_build_level (GtkTreeModelFilter *filter,
FilterLevel *parent_level,
FilterElt *parent_elt,
gboolean emit_inserted)
{
GtkTreeIter iter;
GtkTreeIter first_node;
GtkTreeIter root;
FilterLevel *new_level;
FilterLevel *tmp_level;
FilterElt *tmp_elt;
GtkTreeIter f_iter;
gint length = 0;
gint i;
gboolean empty = TRUE;
g_assert (filter->priv->child_model != NULL);
/* Avoid building a level that already exists */
if (parent_level)
g_assert (parent_elt->children == NULL);
else
g_assert (filter->priv->root == NULL);
if (filter->priv->in_row_deleted)
return;
if (!parent_level)
{
if (filter->priv->virtual_root)
{
if (gtk_tree_model_get_iter (filter->priv->child_model, &root, filter->priv->virtual_root) == FALSE)
return;
length = gtk_tree_model_iter_n_children (filter->priv->child_model, &root);
if (gtk_tree_model_iter_children (filter->priv->child_model, &iter, &root) == FALSE)
return;
}
else
{
if (!gtk_tree_model_get_iter_first (filter->priv->child_model, &iter))
return;
length = gtk_tree_model_iter_n_children (filter->priv->child_model, NULL);
}
}
else
{
GtkTreeIter parent_iter;
GtkTreeIter child_parent_iter;
parent_iter.stamp = filter->priv->stamp;
parent_iter.user_data = parent_level;
parent_iter.user_data2 = parent_elt;
gtk_tree_model_filter_convert_iter_to_child_iter (filter,
&child_parent_iter,
&parent_iter);
if (gtk_tree_model_iter_children (filter->priv->child_model, &iter, &child_parent_iter) == FALSE)
return;
/* stamp may have changed */
gtk_tree_model_filter_convert_iter_to_child_iter (filter,
&child_parent_iter,
&parent_iter);
length = gtk_tree_model_iter_n_children (filter->priv->child_model, &child_parent_iter);
/* Take a reference on the parent */
gtk_tree_model_filter_real_ref_node (GTK_TREE_MODEL (filter),
&parent_iter, FALSE);
}
g_return_if_fail (length > 0);
new_level = g_new (FilterLevel, 1);
new_level->seq = g_sequence_new (filter_elt_free);
new_level->visible_seq = g_sequence_new (NULL);
new_level->ref_count = 0;
new_level->ext_ref_count = 0;
new_level->parent_elt = parent_elt;
new_level->parent_level = parent_level;
if (parent_elt)
parent_elt->children = new_level;
else
filter->priv->root = new_level;
/* increase the count of zero ref_counts */
tmp_level = parent_level;
tmp_elt = parent_elt;
while (tmp_level)
{
tmp_elt->zero_ref_count++;
tmp_elt = tmp_level->parent_elt;
tmp_level = tmp_level->parent_level;
}
if (new_level != filter->priv->root)
filter->priv->zero_ref_count++;
i = 0;
first_node = iter;
do
{
if (gtk_tree_model_filter_visible (filter, &iter))
{
FilterElt *filter_elt;
filter_elt = filter_elt_new ();
filter_elt->offset = i;
filter_elt->zero_ref_count = 0;
filter_elt->ref_count = 0;
filter_elt->ext_ref_count = 0;
filter_elt->children = NULL;
filter_elt->visible_siter = NULL;
if (GTK_TREE_MODEL_FILTER_CACHE_CHILD_ITERS (filter))
filter_elt->iter = iter;
g_sequence_append (new_level->seq, filter_elt);
filter_elt->visible_siter = g_sequence_append (new_level->visible_seq, filter_elt);
empty = FALSE;
if (emit_inserted)
{
GtkTreePath *f_path;
GtkTreeIter f_iter;
GtkTreeIter children;
f_iter.stamp = filter->priv->stamp;
f_iter.user_data = new_level;
f_iter.user_data2 = filter_elt;
f_path = gtk_tree_model_get_path (GTK_TREE_MODEL (filter),
&f_iter);
gtk_tree_model_row_inserted (GTK_TREE_MODEL (filter),
f_path, &f_iter);
gtk_tree_path_free (f_path);
if (gtk_tree_model_iter_children (filter->priv->child_model,
&children, &iter))
gtk_tree_model_filter_update_children (filter,
new_level,
FILTER_ELT (f_iter.user_data2));
}
}
i++;
}
while (gtk_tree_model_iter_next (filter->priv->child_model, &iter));
/* The level does not contain any visible nodes. However, changes in
* this level might affect the parent node, which can either be visible
* or invisible. Therefore, this level can only be removed again,
* if the parent of the parent node is not visible. In that case,
* possible changes in state of the parent are not requested.
*/
if (empty &&
(parent_level && parent_elt->ext_ref_count == 0))
{
gtk_tree_model_filter_free_level (filter, new_level, FALSE);
return;
}
/* If none of the nodes are visible, we will just pull in the
* first node of the level.
*/
if (empty)
{
FilterElt *filter_elt;
filter_elt = filter_elt_new ();
filter_elt->offset = 0;
filter_elt->zero_ref_count = 0;
filter_elt->ref_count = 0;
filter_elt->ext_ref_count = 0;
filter_elt->children = NULL;
filter_elt->visible_siter = NULL;
if (GTK_TREE_MODEL_FILTER_CACHE_CHILD_ITERS (filter))
filter_elt->iter = first_node;
g_sequence_append (new_level->seq, filter_elt);
}
/* Keep a reference on the first node of this level. We need this
* to make sure that we get all signals for this level.
*/
f_iter.stamp = filter->priv->stamp;
f_iter.user_data = new_level;
f_iter.user_data2 = g_sequence_get (g_sequence_get_begin_iter (new_level->seq));
gtk_tree_model_filter_real_ref_node (GTK_TREE_MODEL (filter), &f_iter,
FALSE);
}
static void
gtk_tree_model_filter_free_level (GtkTreeModelFilter *filter,
FilterLevel *filter_level,
gboolean unref)
{
GSequenceIter *siter;
GSequenceIter *end_siter;
g_assert (filter_level);
end_siter = g_sequence_get_end_iter (filter_level->seq);
for (siter = g_sequence_get_begin_iter (filter_level->seq);
siter != end_siter;
siter = g_sequence_iter_next (siter))
{
FilterElt *elt = g_sequence_get (siter);
if (elt->children)
gtk_tree_model_filter_free_level (filter,
FILTER_LEVEL (elt->children),
unref);
}
/* Release the reference on the first item.
*/
if (unref)
{
GtkTreeIter f_iter;
f_iter.stamp = filter->priv->stamp;
f_iter.user_data = filter_level;
f_iter.user_data2 = g_sequence_get (g_sequence_get_begin_iter (filter_level->seq));
gtk_tree_model_filter_real_unref_node (GTK_TREE_MODEL (filter),
&f_iter, FALSE, TRUE);
}
if (filter_level->ext_ref_count == 0)
{
FilterLevel *parent_level = filter_level->parent_level;
FilterElt *parent_elt = filter_level->parent_elt;
while (parent_level)
{
parent_elt->zero_ref_count--;
parent_elt = parent_level->parent_elt;
parent_level = parent_level->parent_level;
}
if (filter_level != filter->priv->root)
filter->priv->zero_ref_count--;
}
if (filter_level->parent_elt)
{
/* Release reference on parent */
if (unref)
{
GtkTreeIter parent_iter;
parent_iter.stamp = filter->priv->stamp;
parent_iter.user_data = filter_level->parent_level;
parent_iter.user_data2 = filter_level->parent_elt;
gtk_tree_model_filter_real_unref_node (GTK_TREE_MODEL (filter),
&parent_iter, FALSE, TRUE);
}
filter_level->parent_elt->children = NULL;
}
else
filter->priv->root = NULL;
g_sequence_free (filter_level->seq);
g_sequence_free (filter_level->visible_seq);
g_free (filter_level);
}
static void
gtk_tree_model_filter_level_transfer_first_ref (GtkTreeModelFilter *filter,
FilterLevel *level,
GSequenceIter *from_iter,
GSequenceIter *to_iter)
{
GtkTreeIter f_iter;
f_iter.stamp = filter->priv->stamp;
f_iter.user_data = level;
f_iter.user_data2 = g_sequence_get (to_iter);
gtk_tree_model_filter_real_ref_node (GTK_TREE_MODEL (filter),
&f_iter, FALSE);
f_iter.stamp = filter->priv->stamp;
f_iter.user_data = level;
f_iter.user_data2 = g_sequence_get (from_iter);
gtk_tree_model_filter_real_unref_node (GTK_TREE_MODEL (filter),
&f_iter, FALSE, TRUE);
}
static void
gtk_tree_model_filter_level_transfer_first_ref_with_index (GtkTreeModelFilter *filter,
FilterLevel *level,
gint from_index,
gint to_index)
{
gtk_tree_model_filter_level_transfer_first_ref (filter, level,
g_sequence_get_iter_at_pos (level->seq, from_index),
g_sequence_get_iter_at_pos (level->seq, to_index));
}
/* Creates paths suitable for accessing the child model. */
static GtkTreePath *
gtk_tree_model_filter_elt_get_path (FilterLevel *level,
FilterElt *elt,
GtkTreePath *root)
{
FilterLevel *walker = level;
FilterElt *walker2 = elt;
GtkTreePath *path;
GtkTreePath *real_path;
g_return_val_if_fail (level != NULL, NULL);
g_return_val_if_fail (elt != NULL, NULL);
path = gtk_tree_path_new ();
while (walker)
{
gtk_tree_path_prepend_index (path, walker2->offset);
walker2 = walker->parent_elt;
walker = walker->parent_level;
}
if (root)
{
real_path = gtk_tree_model_filter_add_root (path, root);
gtk_tree_path_free (path);
return real_path;
}
return path;
}
static GtkTreePath *
gtk_tree_model_filter_add_root (GtkTreePath *src,
GtkTreePath *root)
{
GtkTreePath *retval;
gint i;
retval = gtk_tree_path_copy (root);
for (i = 0; i < gtk_tree_path_get_depth (src); i++)
gtk_tree_path_append_index (retval, gtk_tree_path_get_indices (src)[i]);
return retval;
}
static GtkTreePath *
gtk_tree_model_filter_remove_root (GtkTreePath *src,
GtkTreePath *root)
{
GtkTreePath *retval;
gint i;
gint depth;
gint *indices;
if (gtk_tree_path_get_depth (src) <= gtk_tree_path_get_depth (root))
return NULL;
depth = gtk_tree_path_get_depth (src);
indices = gtk_tree_path_get_indices (src);
for (i = 0; i < gtk_tree_path_get_depth (root); i++)
if (indices[i] != gtk_tree_path_get_indices (root)[i])
return NULL;
retval = gtk_tree_path_new ();
for (; i < depth; i++)
gtk_tree_path_append_index (retval, indices[i]);
return retval;
}
static void
gtk_tree_model_filter_increment_stamp (GtkTreeModelFilter *filter)
{
do
{
filter->priv->stamp++;
}
while (filter->priv->stamp == 0);
gtk_tree_model_filter_clear_cache (filter);
}
static gboolean
gtk_tree_model_filter_real_visible (GtkTreeModelFilter *filter,
GtkTreeModel *child_model,
GtkTreeIter *child_iter)
{
if (filter->priv->visible_func)
{
return filter->priv->visible_func (child_model,
child_iter,
filter->priv->visible_data)
? TRUE : FALSE;
}
else if (filter->priv->visible_column >= 0)
{
GValue val = {0, };
gtk_tree_model_get_value (child_model, child_iter,
filter->priv->visible_column, &val);
if (g_value_get_boolean (&val))
{
g_value_unset (&val);
return TRUE;
}
g_value_unset (&val);
return FALSE;
}
/* no visible function set, so always visible */
return TRUE;
}
static gboolean
gtk_tree_model_filter_visible (GtkTreeModelFilter *self,
GtkTreeIter *child_iter)
{
return GTK_TREE_MODEL_FILTER_GET_CLASS (self)->visible (self,
self->priv->child_model, child_iter);
}
static void
gtk_tree_model_filter_clear_cache_helper_iter (gpointer data,
gpointer user_data)
{
GtkTreeModelFilter *filter = user_data;
FilterElt *elt = data;
if (elt->zero_ref_count > 0)
gtk_tree_model_filter_clear_cache_helper (filter, elt->children);
}
static void
gtk_tree_model_filter_clear_cache_helper (GtkTreeModelFilter *filter,
FilterLevel *level)
{
g_assert (level);
g_sequence_foreach (level->seq, gtk_tree_model_filter_clear_cache_helper_iter, filter);
/* If the level's ext_ref_count is zero, it means the level is not visible
* and can be removed. But, since we support monitoring a child level
* of a parent for changes (these might affect the parent), we will only
* free the level if the parent's parent also has an external ref
* count of zero. In that case, changes concerning our parent are
* not requested.
*/
if (level->ext_ref_count == 0 && level != filter->priv->root &&
level->parent_level && level->parent_elt &&
level->parent_elt->ext_ref_count == 0)
{
gtk_tree_model_filter_free_level (filter, level, TRUE);
return;
}
}
static gboolean
gtk_tree_model_filter_elt_is_visible_in_target (FilterLevel *level,
FilterElt *elt)
{
if (!elt->visible_siter)
return FALSE;
if (!level->parent_elt)
return TRUE;
do
{
elt = level->parent_elt;
level = level->parent_level;
if (elt && !elt->visible_siter)
return FALSE;
}
while (level);
return TRUE;
}
/* If a change has occurred in path (inserted, changed or deleted),
* then this function is used to check all its ancestors. An ancestor
* could have changed state as a result and this needs to be propagated
* to the objects monitoring the filter model.
*/
static void
gtk_tree_model_filter_check_ancestors (GtkTreeModelFilter *filter,
GtkTreePath *path)
{
int i = 0;
int *indices = gtk_tree_path_get_indices (path);
FilterElt *elt;
FilterLevel *level;
GtkTreeIter c_iter, tmp_iter;
level = FILTER_LEVEL (filter->priv->root);
if (!level)
return;
if (filter->priv->virtual_root)
gtk_tree_model_get_iter (filter->priv->child_model, &c_iter,
filter->priv->virtual_root);
tmp_iter = c_iter;
gtk_tree_model_iter_nth_child (filter->priv->child_model, &c_iter,
filter->priv->virtual_root ? &tmp_iter : NULL,
indices[i]);
while (i < gtk_tree_path_get_depth (path) - 1)
{
gboolean requested_state;
elt = lookup_elt_with_offset (level->seq,
gtk_tree_path_get_indices (path)[i], NULL);
requested_state = gtk_tree_model_filter_visible (filter, &c_iter);
if (!elt)
{
int index;
GtkTreePath *c_path;
if (requested_state == FALSE)
return;
/* The elt does not exist in this level (so it is not
* visible), but should now be visible. We emit the
* row-inserted and row-has-child-toggled signals.
*/
elt = gtk_tree_model_filter_insert_elt_in_level (filter,
&c_iter,
level,
indices[i],
&index);
/* insert_elt_in_level defaults to FALSE */
elt->visible_siter = g_sequence_insert_sorted (level->visible_seq,
elt,
filter_elt_cmp, NULL);
c_path = gtk_tree_model_get_path (filter->priv->child_model,
&c_iter);
gtk_tree_model_filter_emit_row_inserted_for_path (filter,
filter->priv->child_model,
c_path,
&c_iter);
gtk_tree_path_free (c_path);
/* We can immediately return, because this node was not visible
* before and its children will be checked for in response to
* the emitted row-has-child-toggled signal.
*/
return;
}
else if (elt->visible_siter)
{
if (!requested_state)
{
/* A node has turned invisible. Remove it from the level
* and emit row-deleted. Since this node is being
* deleted. it makes no sense to look further up the
* chain.
*/
gtk_tree_model_filter_remove_elt_from_level (filter,
level, elt);
return;
}
/* Otherwise continue up the chain */
}
else if (!elt->visible_siter)
{
if (requested_state)
{
/* A node is already in the cache, but invisible. This
* is usually a node on which a reference is kept by
* the filter model, or a node fetched on the filter's
* request, and thus not shown. Therefore, we will
* not emit row-inserted for this node. Instead,
* we signal to its parent that a change has occurred.
*
* Exception: root level, in this case, we must emit
* row-inserted.
*/
if (level->parent_level)
{
GtkTreeIter f_iter;
GtkTreePath *f_path;
elt->visible_siter = g_sequence_insert_sorted (level->visible_seq, elt,
filter_elt_cmp, NULL);
f_iter.stamp = filter->priv->stamp;
f_iter.user_data = level->parent_level;
f_iter.user_data2 = level->parent_elt;
f_path = gtk_tree_model_get_path (GTK_TREE_MODEL (filter),
&f_iter);
gtk_tree_model_row_has_child_toggled (GTK_TREE_MODEL (filter),
f_path, &f_iter);
gtk_tree_path_free (f_path);
}
else
{
GtkTreePath *c_path;
elt->visible_siter = g_sequence_insert_sorted (level->visible_seq, elt,
filter_elt_cmp, NULL);
c_path = gtk_tree_model_get_path (filter->priv->child_model,
&c_iter);
gtk_tree_model_filter_emit_row_inserted_for_path (filter,
filter->priv->child_model,
c_path,
&c_iter);
gtk_tree_path_free (c_path);
}
/* We can immediately return, because this node was not visible
* before and the parent will check its children, including
* this node, in response to the emitted row-has-child-toggled
* signal.
*/
return;
}
/* Not visible, so no need to continue. */
return;
}
if (!elt->children)
{
/* If an elt does not have children, these are not visible.
* Therefore, any signals emitted for these children will
* be ignored, so we do not have to emit them.
*/
return;
}
level = elt->children;
i++;
tmp_iter = c_iter;
gtk_tree_model_iter_nth_child (filter->priv->child_model, &c_iter,
&tmp_iter, indices[i]);
}
}
static FilterElt *
gtk_tree_model_filter_insert_elt_in_level (GtkTreeModelFilter *filter,
GtkTreeIter *c_iter,
FilterLevel *level,
gint offset,
gint *index)
{
FilterElt *elt;
GSequenceIter *siter;
elt = filter_elt_new ();
if (GTK_TREE_MODEL_FILTER_CACHE_CHILD_ITERS (filter))
elt->iter = *c_iter;
elt->offset = offset;
elt->zero_ref_count = 0;
elt->ref_count = 0;
elt->ext_ref_count = 0;
elt->children = NULL;
/* Because we don't emit row_inserted, the node is invisible and thus
* not inserted in visible_seq
*/
elt->visible_siter = NULL;
siter = g_sequence_insert_sorted (level->seq, elt, filter_elt_cmp, NULL);
*index = g_sequence_iter_get_position (siter);
/* If the insert location is zero, we need to move our reference
* on the old first node to the new first node.
*/
if (*index == 0)
gtk_tree_model_filter_level_transfer_first_ref_with_index (filter, level,
1, 0);
return elt;
}
static FilterElt *
gtk_tree_model_filter_fetch_child (GtkTreeModelFilter *filter,
FilterLevel *level,
gint offset,
gint *index)
{
gint len;
GtkTreePath *c_path = NULL;
GtkTreeIter c_iter;
GtkTreePath *c_parent_path = NULL;
GtkTreeIter c_parent_iter;
/* check if child exists and is visible */
if (level->parent_elt)
{
c_parent_path =
gtk_tree_model_filter_elt_get_path (level->parent_level,
level->parent_elt,
filter->priv->virtual_root);
if (!c_parent_path)
return NULL;
}
else
{
if (filter->priv->virtual_root)
c_parent_path = gtk_tree_path_copy (filter->priv->virtual_root);
else
c_parent_path = NULL;
}
if (c_parent_path)
{
gtk_tree_model_get_iter (filter->priv->child_model,
&c_parent_iter,
c_parent_path);
len = gtk_tree_model_iter_n_children (filter->priv->child_model,
&c_parent_iter);
c_path = gtk_tree_path_copy (c_parent_path);
gtk_tree_path_free (c_parent_path);
}
else
{
len = gtk_tree_model_iter_n_children (filter->priv->child_model, NULL);
c_path = gtk_tree_path_new ();
}
gtk_tree_path_append_index (c_path, offset);
gtk_tree_model_get_iter (filter->priv->child_model, &c_iter, c_path);
gtk_tree_path_free (c_path);
if (offset >= len || !gtk_tree_model_filter_visible (filter, &c_iter))
return NULL;
return gtk_tree_model_filter_insert_elt_in_level (filter, &c_iter,
level, offset,
index);
}
/* Note that this function is never called from the row-deleted handler.
* This means that this function is only used for removing elements
* which are still present in the child model. As a result, we must
* take care to properly release the references the filter model has
* on the child model nodes.
*/
static void
gtk_tree_model_filter_remove_elt_from_level (GtkTreeModelFilter *filter,
FilterLevel *level,
FilterElt *elt)
{
FilterElt *parent;
FilterLevel *parent_level;
gint length, orig_level_ext_ref_count;
GtkTreeIter iter;
GtkTreePath *path = NULL;
gboolean emit_child_toggled = FALSE;
iter.stamp = filter->priv->stamp;
iter.user_data = level;
iter.user_data2 = elt;
path = gtk_tree_model_get_path (GTK_TREE_MODEL (filter), &iter);
parent = level->parent_elt;
parent_level = level->parent_level;
length = g_sequence_get_length (level->seq);
/* We need to know about the level's ext ref count before removal
* of this node.
*/
orig_level_ext_ref_count = level->ext_ref_count;
/* first register the node to be invisible */
g_sequence_remove (elt->visible_siter);
elt->visible_siter = NULL;
/* we distinguish a couple of cases:
* - root level, length > 1: emit row-deleted and remove.
* - root level, length == 1: emit row-deleted and keep in cache.
* - level, length == 1: parent->ext_ref_count > 0: emit row-deleted
* and keep.
* - level, length > 1: emit row-deleted and remove.
* - else, remove level.
*
* if level != root level and the number of visible nodes is 0 (ie. this
* is the last node to be removed from the level), emit
* row-has-child-toggled.
*/
if (level != filter->priv->root
&& g_sequence_get_length (level->visible_seq) == 0
&& parent
&& parent->visible_siter)
emit_child_toggled = TRUE;
if (length > 1)
{
GSequenceIter *siter;
/* We emit row-deleted, and remove the node from the cache.
* If it has any children, these will be removed here as well.
*/
if (elt->children)
gtk_tree_model_filter_free_level (filter, elt->children, TRUE);
/* If the first node is being removed, transfer, the reference */
if (elt == g_sequence_get (g_sequence_get_begin_iter (level->seq)))
{
gtk_tree_model_filter_level_transfer_first_ref_with_index (filter, level,
0, 1);
}
while (elt->ext_ref_count > 0)
gtk_tree_model_filter_real_unref_node (GTK_TREE_MODEL (filter),
&iter, TRUE, FALSE);
while (elt->ref_count > 0)
gtk_tree_model_filter_real_unref_node (GTK_TREE_MODEL (filter),
&iter, FALSE, FALSE);
/* remove the node */
lookup_elt_with_offset (level->seq, elt->offset, &siter);
g_sequence_remove (siter);
gtk_tree_model_filter_increment_stamp (filter);
/* Only if the node is in the root level (parent == NULL) or
* the level is visible, a row-deleted signal is necessary.
*/
if (!parent || orig_level_ext_ref_count > 0)
gtk_tree_model_row_deleted (GTK_TREE_MODEL (filter), path);
}
else if ((length == 1 && parent && parent->ext_ref_count > 0)
|| (length == 1 && level == filter->priv->root))
{
/* We emit row-deleted, but keep the node in the cache and
* referenced. Its children will be removed.
*/
if (elt->children)
{
gtk_tree_model_filter_free_level (filter, elt->children, TRUE);
elt->children = NULL;
}
gtk_tree_model_filter_increment_stamp (filter);
/* Only if the node is in the root level (parent == NULL) or
* the level is visible, a row-deleted signal is necessary.
*/
if (!parent || orig_level_ext_ref_count > 0)
gtk_tree_model_row_deleted (GTK_TREE_MODEL (filter), path);
}
else
{
while (elt->ext_ref_count > 0)
gtk_tree_model_filter_real_unref_node (GTK_TREE_MODEL (filter),
&iter, TRUE, FALSE);
while (elt->ref_count > 0)
gtk_tree_model_filter_real_unref_node (GTK_TREE_MODEL (filter),
&iter, FALSE, FALSE);
/* Blow level away, including any child levels */
gtk_tree_model_filter_free_level (filter, level, TRUE);
gtk_tree_model_filter_increment_stamp (filter);
if (!parent || orig_level_ext_ref_count > 0)
gtk_tree_model_row_deleted (GTK_TREE_MODEL (filter), path);
}
gtk_tree_path_free (path);
if (emit_child_toggled && parent->ext_ref_count > 0)
{
GtkTreeIter piter;
GtkTreePath *ppath;
piter.stamp = filter->priv->stamp;
piter.user_data = parent_level;
piter.user_data2 = parent;
ppath = gtk_tree_model_get_path (GTK_TREE_MODEL (filter), &piter);
gtk_tree_model_row_has_child_toggled (GTK_TREE_MODEL (filter),
ppath, &piter);
gtk_tree_path_free (ppath);
}
}
/* This function is called after the given node has become visible.
* When the node has children, we should build the level and
* take a reference on the first child.
*/
static void
gtk_tree_model_filter_update_children (GtkTreeModelFilter *filter,
FilterLevel *level,
FilterElt *elt)
{
GtkTreeIter c_iter;
GtkTreeIter iter;
if (!elt->visible_siter)
return;
iter.stamp = filter->priv->stamp;
iter.user_data = level;
iter.user_data2 = elt;
gtk_tree_model_filter_convert_iter_to_child_iter (filter, &c_iter, &iter);
if ((!level->parent_level || level->parent_elt->ext_ref_count > 0) &&
gtk_tree_model_iter_has_child (filter->priv->child_model, &c_iter))
{
if (!elt->children)
gtk_tree_model_filter_build_level (filter, level, elt, FALSE);
if (elt->ext_ref_count > 0 && elt->children &&
g_sequence_get_length (elt->children->seq))
{
GtkTreePath *path;
path = gtk_tree_model_get_path (GTK_TREE_MODEL (filter), &iter);
gtk_tree_model_row_has_child_toggled (GTK_TREE_MODEL (filter),
path,
&iter);
if (path)
gtk_tree_path_free (path);
}
}
}
/* Path is relative to the child model (this is on search on elt offset)
* but with the virtual root already removed if necesssary.
*/
static gboolean
find_elt_with_offset (GtkTreeModelFilter *filter,
GtkTreePath *path,
FilterLevel **level_,
FilterElt **elt_)
{
int i = 0;
FilterLevel *level;
FilterLevel *parent_level = NULL;
FilterElt *elt = NULL;
level = FILTER_LEVEL (filter->priv->root);
while (i < gtk_tree_path_get_depth (path))
{
if (!level)
return FALSE;
elt = lookup_elt_with_offset (level->seq,
gtk_tree_path_get_indices (path)[i],
NULL);
if (!elt)
return FALSE;
parent_level = level;
level = elt->children;
i++;
}
if (level_)
*level_ = parent_level;
if (elt_)
*elt_ = elt;
return TRUE;
}
/* TreeModel signals */
static void
gtk_tree_model_filter_emit_row_inserted_for_path (GtkTreeModelFilter *filter,
GtkTreeModel *c_model,
GtkTreePath *c_path,
GtkTreeIter *c_iter)
{
FilterLevel *level;
FilterElt *elt;
GtkTreePath *path;
GtkTreeIter iter, children;
gboolean signals_emitted = FALSE;
if (!filter->priv->root)
{
/* The root level has not been exposed to the view yet, so we
* need to emit signals for any node that is being inserted.
*/
gtk_tree_model_filter_build_level (filter, NULL, NULL, TRUE);
/* Check if the root level was built. Then child levels
* that matter have also been built (due to update_children,
* which triggers iter_n_children).
*/
if (filter->priv->root &&
g_sequence_get_length (FILTER_LEVEL (filter->priv->root)->visible_seq) > 0)
signals_emitted = TRUE;
}
gtk_tree_model_filter_increment_stamp (filter);
/* We need to disallow to build new levels, because we are then pulling
* in a child in an invisible level. We only want to find path if it
* is in a visible level (and thus has a parent that is visible).
*/
path = gtk_real_tree_model_filter_convert_child_path_to_path (filter,
c_path,
FALSE,
TRUE);
if (!path)
/* parent is probably being filtered out */
return;
gtk_tree_model_filter_get_iter_full (GTK_TREE_MODEL (filter), &iter, path);
level = FILTER_LEVEL (iter.user_data);
elt = FILTER_ELT (iter.user_data2);
/* Make sure elt is visible. elt can already be visible in case
* it was pulled in above, so avoid inserted it into visible_seq twice.
*/
if (!elt->visible_siter)
{
elt->visible_siter = g_sequence_insert_sorted (level->visible_seq,
elt, filter_elt_cmp,
NULL);
}
/* Check whether the node and all of its parents are visible */
if (gtk_tree_model_filter_elt_is_visible_in_target (level, elt))
{
/* visibility changed -- reget path */
gtk_tree_path_free (path);
path = gtk_tree_model_get_path (GTK_TREE_MODEL (filter), &iter);
if (!signals_emitted &&
(!level->parent_level || level->ext_ref_count > 0))
gtk_tree_model_row_inserted (GTK_TREE_MODEL (filter), path, &iter);
if (level->parent_level && level->parent_elt->ext_ref_count > 0 &&
g_sequence_get_length (level->visible_seq) == 1)
{
/* We know that this is the first visible node in this level, so
* we need to emit row-has-child-toggled on the parent. This
* does not apply to the root level.
*/
gtk_tree_path_up (path);
gtk_tree_model_get_iter (GTK_TREE_MODEL (filter), &iter, path);
gtk_tree_model_row_has_child_toggled (GTK_TREE_MODEL (filter),
path,
&iter);
}
if (!signals_emitted
&& gtk_tree_model_iter_children (c_model, &children, c_iter))
gtk_tree_model_filter_update_children (filter, level, elt);
}
gtk_tree_path_free (path);
}
static void
gtk_tree_model_filter_row_changed (GtkTreeModel *c_model,
GtkTreePath *c_path,
GtkTreeIter *c_iter,
gpointer data)
{
GtkTreeModelFilter *filter = GTK_TREE_MODEL_FILTER (data);
GtkTreeIter iter;
GtkTreeIter children;
GtkTreeIter real_c_iter;
GtkTreePath *path = NULL;
GtkTreePath *real_path = NULL;
FilterElt *elt;
FilterLevel *level;
gboolean requested_state;
gboolean current_state;
gboolean free_c_path = FALSE;
g_return_if_fail (c_path != NULL || c_iter != NULL);
if (!c_path)
{
c_path = gtk_tree_model_get_path (c_model, c_iter);
free_c_path = TRUE;
}
if (filter->priv->virtual_root)
real_path = gtk_tree_model_filter_remove_root (c_path,
filter->priv->virtual_root);
else
real_path = gtk_tree_path_copy (c_path);
if (c_iter)
real_c_iter = *c_iter;
else
gtk_tree_model_get_iter (c_model, &real_c_iter, c_path);
/* is this node above the virtual root? */
if (filter->priv->virtual_root &&
(gtk_tree_path_get_depth (filter->priv->virtual_root)
>= gtk_tree_path_get_depth (c_path)))
goto done;
/* what's the requested state? */
requested_state = gtk_tree_model_filter_visible (filter, &real_c_iter);
/* now, let's see whether the item is there */
path = gtk_real_tree_model_filter_convert_child_path_to_path (filter,
c_path,
FALSE,
FALSE);
if (path)
{
gtk_tree_model_filter_get_iter_full (GTK_TREE_MODEL (filter),
&iter, path);
current_state = FILTER_ELT (iter.user_data2)->visible_siter != NULL;
}
else
current_state = FALSE;
if (current_state == FALSE && requested_state == FALSE)
/* no changes required */
goto done;
if (current_state == TRUE && requested_state == FALSE)
{
gtk_tree_model_filter_remove_elt_from_level (filter,
FILTER_LEVEL (iter.user_data),
FILTER_ELT (iter.user_data2));
if (real_path)
gtk_tree_model_filter_check_ancestors (filter, real_path);
goto done;
}
if (current_state == TRUE && requested_state == TRUE)
{
/* propagate the signal; also get a path taking only visible
* nodes into account.
*/
gtk_tree_path_free (path);
path = gtk_tree_model_get_path (GTK_TREE_MODEL (filter), &iter);
level = FILTER_LEVEL (iter.user_data);
elt = FILTER_ELT (iter.user_data2);
if (gtk_tree_model_filter_elt_is_visible_in_target (level, elt))
{
if (level->ext_ref_count > 0)
gtk_tree_model_row_changed (GTK_TREE_MODEL (filter), path, &iter);
/* and update the children */
if (gtk_tree_model_iter_children (c_model, &children, &real_c_iter))
gtk_tree_model_filter_update_children (filter, level, elt);
}
if (real_path)
gtk_tree_model_filter_check_ancestors (filter, real_path);
goto done;
}
/* only current == FALSE and requested == TRUE is left,
* pull in the child
*/
g_return_if_fail (current_state == FALSE && requested_state == TRUE);
if (real_path)
gtk_tree_model_filter_check_ancestors (filter, real_path);
gtk_tree_model_filter_emit_row_inserted_for_path (filter, c_model,
c_path, c_iter);
done:
if (path)
gtk_tree_path_free (path);
if (real_path)
gtk_tree_path_free (real_path);
if (free_c_path)
gtk_tree_path_free (c_path);
}
static void
gtk_tree_model_filter_row_inserted (GtkTreeModel *c_model,
GtkTreePath *c_path,
GtkTreeIter *c_iter,
gpointer data)
{
GtkTreeModelFilter *filter = GTK_TREE_MODEL_FILTER (data);
GtkTreePath *real_path = NULL;
GtkTreeIter real_c_iter;
FilterElt *elt = NULL;
FilterLevel *level = NULL;
FilterLevel *parent_level = NULL;
GSequenceIter *siter;
FilterElt dummy;
gint i = 0, offset;
gboolean free_c_path = FALSE;
gboolean emit_row_inserted = FALSE;
g_return_if_fail (c_path != NULL || c_iter != NULL);
if (!c_path)
{
c_path = gtk_tree_model_get_path (c_model, c_iter);
free_c_path = TRUE;
}
if (c_iter)
real_c_iter = *c_iter;
else
gtk_tree_model_get_iter (c_model, &real_c_iter, c_path);
/* the row has already been inserted. so we need to fixup the
* virtual root here first
*/
if (filter->priv->virtual_root)
{
if (gtk_tree_path_get_depth (filter->priv->virtual_root) >=
gtk_tree_path_get_depth (c_path))
{
gint level;
gint *v_indices, *c_indices;
gboolean common_prefix = TRUE;
level = gtk_tree_path_get_depth (c_path) - 1;
v_indices = gtk_tree_path_get_indices (filter->priv->virtual_root);
c_indices = gtk_tree_path_get_indices (c_path);
for (i = 0; i < level; i++)
if (v_indices[i] != c_indices[i])
{
common_prefix = FALSE;
break;
}
if (common_prefix && v_indices[level] >= c_indices[level])
(v_indices[level])++;
}
}
/* subtract virtual root if necessary */
if (filter->priv->virtual_root)
{
real_path = gtk_tree_model_filter_remove_root (c_path,
filter->priv->virtual_root);
/* not our child */
if (!real_path)
goto done;
}
else
real_path = gtk_tree_path_copy (c_path);
if (!filter->priv->root)
{
/* The root level has not been exposed to the view yet, so we
* need to emit signals for any node that is being inserted.
*/
gtk_tree_model_filter_build_level (filter, NULL, NULL, TRUE);
/* Check if the root level was built. Then child levels
* that matter have also been built (due to update_children,
* which triggers iter_n_children).
*/
if (filter->priv->root)
{
emit_row_inserted = FALSE;
goto done;
}
}
if (gtk_tree_path_get_depth (real_path) - 1 >= 1)
{
gboolean found = FALSE;
GtkTreePath *parent = gtk_tree_path_copy (real_path);
gtk_tree_path_up (parent);
found = find_elt_with_offset (filter, parent, &parent_level, &elt);
gtk_tree_path_free (parent);
if (!found)
/* Parent is not in the cache and probably being filtered out */
goto done;
level = elt->children;
}
else
level = FILTER_LEVEL (filter->priv->root);
if (!level)
{
if (elt && elt->visible_siter)
{
/* The level in which the new node should be inserted does not
* exist, but the parent, elt, does. If elt is visible, emit
* row-has-child-toggled.
*/
GtkTreePath *tmppath;
GtkTreeIter tmpiter;
tmpiter.stamp = filter->priv->stamp;
tmpiter.user_data = parent_level;
tmpiter.user_data2 = elt;
tmppath = gtk_tree_model_get_path (GTK_TREE_MODEL (filter),
&tmpiter);
if (tmppath)
{
gtk_tree_model_row_has_child_toggled (GTK_TREE_MODEL (filter),
tmppath, &tmpiter);
gtk_tree_path_free (tmppath);
}
}
goto done;
}
/* let's try to insert the value */
offset = gtk_tree_path_get_indices (real_path)[gtk_tree_path_get_depth (real_path) - 1];
/* update the offsets, yes if we didn't insert the node above, there will
* be a gap here. This will be filled with the node (via fetch_child) when
* it becomes visible
*/
dummy.offset = offset;
siter = g_sequence_search (level->seq, &dummy, filter_elt_cmp, NULL);
siter = g_sequence_iter_prev (siter);
g_sequence_foreach_range (siter, g_sequence_get_end_iter (level->seq),
increase_offset_iter, GINT_TO_POINTER (offset));
/* only insert when visible */
if (gtk_tree_model_filter_visible (filter, &real_c_iter))
{
FilterElt *felt;
felt = gtk_tree_model_filter_insert_elt_in_level (filter,
&real_c_iter,
level, offset,
&i);
/* insert_elt_in_level defaults to FALSE */
felt->visible_siter = g_sequence_insert_sorted (level->visible_seq,
felt,
filter_elt_cmp, NULL);
emit_row_inserted = TRUE;
}
done:
gtk_tree_model_filter_check_ancestors (filter, real_path);
if (emit_row_inserted)
gtk_tree_model_filter_emit_row_inserted_for_path (filter, c_model,
c_path, c_iter);
if (real_path)
gtk_tree_path_free (real_path);
if (free_c_path)
gtk_tree_path_free (c_path);
}
static void
gtk_tree_model_filter_row_has_child_toggled (GtkTreeModel *c_model,
GtkTreePath *c_path,
GtkTreeIter *c_iter,
gpointer data)
{
GtkTreeModelFilter *filter = GTK_TREE_MODEL_FILTER (data);
GtkTreePath *path;
GtkTreeIter iter;
FilterLevel *level;
FilterElt *elt;
gboolean requested_state;
g_return_if_fail (c_path != NULL && c_iter != NULL);
/* If we get row-has-child-toggled on the virtual root, and there is
* no root level; try to build it now.
*/
if (filter->priv->virtual_root && !filter->priv->root
&& !gtk_tree_path_compare (c_path, filter->priv->virtual_root))
{
gtk_tree_model_filter_build_level (filter, NULL, NULL, TRUE);
return;
}
/* For all other levels, there is a chance that the visibility state
* of the parent has changed now.
*/
path = gtk_real_tree_model_filter_convert_child_path_to_path (filter,
c_path,
FALSE,
TRUE);
if (!path)
return;
gtk_tree_model_filter_get_iter_full (GTK_TREE_MODEL (data), &iter, path);
level = FILTER_LEVEL (iter.user_data);
elt = FILTER_ELT (iter.user_data2);
gtk_tree_path_free (path);
requested_state = gtk_tree_model_filter_visible (filter, c_iter);
if (!elt->visible_siter && !requested_state)
{
/* The parent node currently is not visible and will not become
* visible, so we will not pass on the row-has-child-toggled event.
*/
return;
}
else if (elt->visible_siter && !requested_state)
{
/* The node is no longer visible, so it has to be removed.
* _remove_elt_from_level() takes care of emitting row-has-child-toggled
* when required.
*/
gtk_tree_model_filter_remove_elt_from_level (filter, level, elt);
return;
}
else if (!elt->visible_siter && requested_state)
{
elt->visible_siter = g_sequence_insert_sorted (level->visible_seq,
elt, filter_elt_cmp,
NULL);
/* Only insert if the parent is visible in the target */
if (gtk_tree_model_filter_elt_is_visible_in_target (level, elt))
{
path = gtk_tree_model_get_path (GTK_TREE_MODEL (filter), &iter);
gtk_tree_model_row_inserted (GTK_TREE_MODEL (filter), path, &iter);
gtk_tree_path_free (path);
/* We do not update children now, because that will happen
* below.
*/
}
}
/* For the remaining possibility, elt->visible && requested_state
* no action is required.
*/
/* If this node is referenced and has children, build the level so we
* can monitor it for changes.
*/
if (elt->ref_count > 1 && !elt->children &&
gtk_tree_model_iter_has_child (c_model, c_iter))
gtk_tree_model_filter_build_level (filter, level, elt, FALSE);
/* get a path taking only visible nodes into account */
path = gtk_tree_model_get_path (GTK_TREE_MODEL (data), &iter);
gtk_tree_model_row_has_child_toggled (GTK_TREE_MODEL (data), path, &iter);
gtk_tree_path_free (path);
}
static void
gtk_tree_model_filter_virtual_root_deleted (GtkTreeModelFilter *filter,
GtkTreePath *c_path)
{
gint i, nodes;
GtkTreePath *path;
FilterLevel *level = FILTER_LEVEL (filter->priv->root);
/* The virtual root (or one of its ancestors) has been deleted. This
* means that all content for our model is now gone. We deal with
* this by removing everything in the filter model: we just iterate
* over the root level and emit a row-deleted for each FilterElt.
* (FIXME: Should we emit row-deleted for child nodes as well? This
* has never been fully clear in TreeModel).
*/
/* We unref the path of the virtual root, up to and not including the
* deleted node which can no longer be unreffed.
*/
gtk_tree_model_filter_unref_path (filter, filter->priv->virtual_root,
gtk_tree_path_get_depth (c_path) - 1);
filter->priv->virtual_root_deleted = TRUE;
if (!level)
return;
nodes = g_sequence_get_length (level->visible_seq);
/* We should not propagate the unref here. An unref for any of these
* nodes will fail, since the respective nodes in the child model are
* no longer there.
*/
gtk_tree_model_filter_free_level (filter, filter->priv->root, FALSE);
gtk_tree_model_filter_increment_stamp (filter);
path = gtk_tree_path_new ();
gtk_tree_path_append_index (path, 0);
for (i = 0; i < nodes; i++)
gtk_tree_model_row_deleted (GTK_TREE_MODEL (filter), path);
gtk_tree_path_free (path);
}
static void
gtk_tree_model_filter_adjust_virtual_root (GtkTreeModelFilter *filter,
GtkTreePath *c_path)
{
gint i;
gint level;
gint *v_indices, *c_indices;
gboolean common_prefix = TRUE;
level = gtk_tree_path_get_depth (c_path) - 1;
v_indices = gtk_tree_path_get_indices (filter->priv->virtual_root);
c_indices = gtk_tree_path_get_indices (c_path);
for (i = 0; i < level; i++)
if (v_indices[i] != c_indices[i])
{
common_prefix = FALSE;
break;
}
if (common_prefix && v_indices[level] > c_indices[level])
(v_indices[level])--;
}
static void
gtk_tree_model_filter_row_deleted_invisible_node (GtkTreeModelFilter *filter,
GtkTreePath *c_path)
{
int offset;
GtkTreePath *real_path;
FilterLevel *level;
FilterElt *elt;
FilterElt dummy;
GSequenceIter *siter;
/* The node deleted in the child model is not visible in the
* filter model. We will not emit a signal, just fixup the offsets
* of the other nodes.
*/
if (!filter->priv->root)
return;
level = FILTER_LEVEL (filter->priv->root);
/* subtract vroot if necessary */
if (filter->priv->virtual_root)
{
real_path = gtk_tree_model_filter_remove_root (c_path,
filter->priv->virtual_root);
/* we don't handle this */
if (!real_path)
return;
}
else
real_path = gtk_tree_path_copy (c_path);
if (gtk_tree_path_get_depth (real_path) - 1 >= 1)
{
gboolean found = FALSE;
GtkTreePath *parent = gtk_tree_path_copy (real_path);
gtk_tree_path_up (parent);
found = find_elt_with_offset (filter, parent, &level, &elt);
gtk_tree_path_free (parent);
if (!found)
{
/* parent is filtered out, so no level */
gtk_tree_path_free (real_path);
return;
}
level = elt->children;
}
offset = gtk_tree_path_get_indices (real_path)[gtk_tree_path_get_depth (real_path) - 1];
gtk_tree_path_free (real_path);
if (!level)
return;
/* decrease offset of all nodes following the deleted node */
dummy.offset = offset;
siter = g_sequence_search (level->seq, &dummy, filter_elt_cmp, NULL);
g_sequence_foreach_range (siter, g_sequence_get_end_iter (level->seq),
decrease_offset_iter, GINT_TO_POINTER (offset));
}
static void
gtk_tree_model_filter_row_deleted (GtkTreeModel *c_model,
GtkTreePath *c_path,
gpointer data)
{
GtkTreeModelFilter *filter = GTK_TREE_MODEL_FILTER (data);
GtkTreePath *path;
GtkTreeIter iter;
FilterElt *elt, *parent_elt = NULL;
FilterLevel *level, *parent_level = NULL;
GSequenceIter *siter;
gboolean emit_child_toggled = FALSE;
gboolean emit_row_deleted = FALSE;
gint offset;
gint orig_level_ext_ref_count;
g_return_if_fail (c_path != NULL);
/* special case the deletion of an ancestor of the virtual root */
if (filter->priv->virtual_root &&
(gtk_tree_path_is_ancestor (c_path, filter->priv->virtual_root) ||
!gtk_tree_path_compare (c_path, filter->priv->virtual_root)))
{
gtk_tree_model_filter_virtual_root_deleted (filter, c_path);
return;
}
/* adjust the virtual root for the deleted row */
if (filter->priv->virtual_root &&
gtk_tree_path_get_depth (filter->priv->virtual_root) >=
gtk_tree_path_get_depth (c_path))
gtk_tree_model_filter_adjust_virtual_root (filter, c_path);
path = gtk_real_tree_model_filter_convert_child_path_to_path (filter,
c_path,
FALSE,
FALSE);
if (!path)
{
gtk_tree_model_filter_row_deleted_invisible_node (filter, c_path);
return;
}
/* a node was deleted, which was in our cache */
gtk_tree_model_filter_get_iter_full (GTK_TREE_MODEL (data), &iter, path);
level = FILTER_LEVEL (iter.user_data);
elt = FILTER_ELT (iter.user_data2);
offset = elt->offset;
orig_level_ext_ref_count = level->ext_ref_count;
if (elt->visible_siter)
{
/* get a path taking only visible nodes into account */
gtk_tree_path_free (path);
path = gtk_tree_model_get_path (GTK_TREE_MODEL (filter), &iter);
if (g_sequence_get_length (level->visible_seq) == 1)
{
emit_child_toggled = TRUE;
parent_level = level->parent_level;
parent_elt = level->parent_elt;
}
emit_row_deleted = TRUE;
}
/* Release the references on this node, without propagation because
* the node does not exist anymore in the child model. The filter
* model's references on the node in case of level->parent or use
* of a virtual root are automatically destroyed by the child model.
*/
while (elt->ext_ref_count > 0)
gtk_tree_model_filter_real_unref_node (GTK_TREE_MODEL (data), &iter,
TRUE, FALSE);
while (elt->ref_count > 0)
gtk_tree_model_filter_real_unref_node (GTK_TREE_MODEL (data), &iter,
FALSE, FALSE);
if (g_sequence_get_length (level->seq) == 1)
{
/* kill level */
gtk_tree_model_filter_free_level (filter, level, FALSE);
}
else
{
GSequenceIter *tmp;
gboolean is_first;
lookup_elt_with_offset (level->seq, elt->offset, &siter);
is_first = g_sequence_get_begin_iter (level->seq) == siter;
/* remove the row */
g_sequence_remove (elt->visible_siter);
tmp = g_sequence_iter_next (siter);
g_sequence_remove (siter);
g_sequence_foreach_range (tmp, g_sequence_get_end_iter (level->seq),
decrease_offset_iter, GINT_TO_POINTER (offset));
/* Take a reference on the new first node. The first node previously
* keeping this reference has been removed above.
*/
if (is_first)
{
GtkTreeIter f_iter;
f_iter.stamp = filter->priv->stamp;
f_iter.user_data = level;
f_iter.user_data2 = g_sequence_get (g_sequence_get_begin_iter (level->seq));
gtk_tree_model_filter_real_ref_node (GTK_TREE_MODEL (filter),
&f_iter, FALSE);
}
}
if (emit_row_deleted)
{
/* emit row_deleted */
gtk_tree_model_filter_increment_stamp (filter);
if (!parent_elt || orig_level_ext_ref_count > 0)
gtk_tree_model_row_deleted (GTK_TREE_MODEL (data), path);
}
if (emit_child_toggled && parent_level)
{
GtkTreeIter iter2;
GtkTreePath *path2;
iter2.stamp = filter->priv->stamp;
iter2.user_data = parent_level;
iter2.user_data2 = parent_elt;
/* We set in_row_deleted to TRUE to avoid a level build triggered
* by row-has-child-toggled (parent model could call iter_has_child
* for example).
*/
filter->priv->in_row_deleted = TRUE;
path2 = gtk_tree_model_get_path (GTK_TREE_MODEL (filter), &iter2);
gtk_tree_model_row_has_child_toggled (GTK_TREE_MODEL (filter),
path2, &iter2);
gtk_tree_path_free (path2);
filter->priv->in_row_deleted = FALSE;
}
if (filter->priv->virtual_root)
{
GtkTreePath *real_path;
real_path = gtk_tree_model_filter_remove_root (c_path,
filter->priv->root);
if (real_path)
{
gtk_tree_model_filter_check_ancestors (filter, real_path);
gtk_tree_path_free (real_path);
}
}
else
gtk_tree_model_filter_check_ancestors (filter, c_path);
gtk_tree_path_free (path);
}
static void
gtk_tree_model_filter_rows_reordered (GtkTreeModel *c_model,
GtkTreePath *c_path,
GtkTreeIter *c_iter,
gint *new_order,
gpointer data)
{
FilterElt *elt;
FilterLevel *level;
GtkTreeModelFilter *filter = GTK_TREE_MODEL_FILTER (data);
GtkTreePath *path;
GtkTreeIter iter;
GSequence *tmp_seq;
GSequenceIter *tmp_end_iter;
GSequenceIter *old_first_elt = NULL;
gint *tmp_array;
gint i, elt_count;
gint length;
g_return_if_fail (new_order != NULL);
if (c_path == NULL || gtk_tree_path_get_depth (c_path) == 0)
{
length = gtk_tree_model_iter_n_children (c_model, NULL);
if (filter->priv->virtual_root)
{
gint new_pos = -1;
/* reorder root level of path */
for (i = 0; i < length; i++)
if (new_order[i] == gtk_tree_path_get_indices (filter->priv->virtual_root)[0])
new_pos = i;
if (new_pos < 0)
return;
gtk_tree_path_get_indices (filter->priv->virtual_root)[0] = new_pos;
return;
}
path = gtk_tree_path_new ();
level = FILTER_LEVEL (filter->priv->root);
}
else
{
GtkTreeIter child_iter;
/* virtual root anchor reordering */
if (filter->priv->virtual_root &&
gtk_tree_path_is_ancestor (c_path, filter->priv->virtual_root))
{
gint new_pos = -1;
gint length;
gint level;
GtkTreeIter real_c_iter;
level = gtk_tree_path_get_depth (c_path);
if (c_iter)
real_c_iter = *c_iter;
else
gtk_tree_model_get_iter (c_model, &real_c_iter, c_path);
length = gtk_tree_model_iter_n_children (c_model, &real_c_iter);
for (i = 0; i < length; i++)
if (new_order[i] == gtk_tree_path_get_indices (filter->priv->virtual_root)[level])
new_pos = i;
if (new_pos < 0)
return;
gtk_tree_path_get_indices (filter->priv->virtual_root)[level] = new_pos;
return;
}
path = gtk_real_tree_model_filter_convert_child_path_to_path (filter,
c_path,
FALSE,
FALSE);
if (!path && filter->priv->virtual_root &&
gtk_tree_path_compare (c_path, filter->priv->virtual_root))
return;
if (!path && !filter->priv->virtual_root)
return;
if (!path)
{
/* root level mode */
if (!c_iter)
gtk_tree_model_get_iter (c_model, c_iter, c_path);
length = gtk_tree_model_iter_n_children (c_model, c_iter);
path = gtk_tree_path_new ();
level = FILTER_LEVEL (filter->priv->root);
}
else
{
gtk_tree_model_filter_get_iter_full (GTK_TREE_MODEL (data),
&iter, path);
elt = FILTER_ELT (iter.user_data2);
if (!elt->children)
{
gtk_tree_path_free (path);
return;
}
level = elt->children;
gtk_tree_model_filter_convert_iter_to_child_iter (GTK_TREE_MODEL_FILTER (filter), &child_iter, &iter);
length = gtk_tree_model_iter_n_children (c_model, &child_iter);
}
}
if (!level || g_sequence_get_length (level->seq) < 1)
{
gtk_tree_path_free (path);
return;
}
/* NOTE: we do not bail out here if level->seq->len < 2 like
* GtkTreeModelSort does. This because we do some special tricky
* reordering.
*/
tmp_seq = g_sequence_new (filter_elt_free);
tmp_end_iter = g_sequence_get_end_iter (tmp_seq);
tmp_array = g_new (gint, g_sequence_get_length (level->visible_seq));
elt_count = 0;
for (i = 0; i < length; i++)
{
FilterElt *elt;
GSequenceIter *siter;
elt = lookup_elt_with_offset (level->seq, new_order[i], &siter);
if (elt == NULL)
continue;
/* Keep a reference if this elt has old_pos == 0 */
if (new_order[i] == 0)
old_first_elt = siter;
/* Only for visible items an entry should be present in the order array
* to be emitted.
*/
if (elt->visible_siter)
tmp_array[elt_count++] = g_sequence_iter_get_position (elt->visible_siter);
/* Steal elt from level->seq and append it to tmp_seq */
g_sequence_move (siter, tmp_end_iter);
elt->offset = i;
}
g_warn_if_fail (g_sequence_get_length (level->seq) == 0);
g_sequence_free (level->seq);
level->seq = tmp_seq;
g_sequence_sort (level->visible_seq, filter_elt_cmp, NULL);
/* Transfer the reference from the old item at position 0 to the
* new item at position 0.
*/
if (old_first_elt && g_sequence_iter_get_position (old_first_elt))
gtk_tree_model_filter_level_transfer_first_ref (filter,
level,
old_first_elt,
g_sequence_get_iter_at_pos (level->seq, 0));
/* emit rows_reordered */
if (g_sequence_get_length (level->visible_seq) > 0)
{
if (!gtk_tree_path_get_indices (path))
gtk_tree_model_rows_reordered (GTK_TREE_MODEL (data), path, NULL,
tmp_array);
else
{
/* get a path taking only visible nodes into account */
gtk_tree_path_free (path);
path = gtk_tree_model_get_path (GTK_TREE_MODEL (data), &iter);
gtk_tree_model_rows_reordered (GTK_TREE_MODEL (data), path, &iter,
tmp_array);
}
}
/* done */
g_free (tmp_array);
gtk_tree_path_free (path);
}
/* TreeModelIface implementation */
static GtkTreeModelFlags
gtk_tree_model_filter_get_flags (GtkTreeModel *model)
{
GtkTreeModelFlags flags;
g_return_val_if_fail (GTK_IS_TREE_MODEL_FILTER (model), 0);
g_return_val_if_fail (GTK_TREE_MODEL_FILTER (model)->priv->child_model != NULL, 0);
flags = gtk_tree_model_get_flags (GTK_TREE_MODEL_FILTER (model)->priv->child_model);
if ((flags & GTK_TREE_MODEL_LIST_ONLY) == GTK_TREE_MODEL_LIST_ONLY)
return GTK_TREE_MODEL_LIST_ONLY;
return 0;
}
static gint
gtk_tree_model_filter_get_n_columns (GtkTreeModel *model)
{
GtkTreeModelFilter *filter = (GtkTreeModelFilter *)model;
g_return_val_if_fail (GTK_IS_TREE_MODEL_FILTER (model), 0);
g_return_val_if_fail (filter->priv->child_model != NULL, 0);
if (filter->priv->child_model == NULL)
return 0;
/* so we can't modify the modify func after this ... */
filter->priv->modify_func_set = TRUE;
if (filter->priv->modify_n_columns > 0)
return filter->priv->modify_n_columns;
return gtk_tree_model_get_n_columns (filter->priv->child_model);
}
static GType
gtk_tree_model_filter_get_column_type (GtkTreeModel *model,
gint index)
{
GtkTreeModelFilter *filter = (GtkTreeModelFilter *)model;
g_return_val_if_fail (GTK_IS_TREE_MODEL_FILTER (model), G_TYPE_INVALID);
g_return_val_if_fail (filter->priv->child_model != NULL, G_TYPE_INVALID);
/* so we can't modify the modify func after this ... */
filter->priv->modify_func_set = TRUE;
if (filter->priv->modify_types)
{
g_return_val_if_fail (index < filter->priv->modify_n_columns, G_TYPE_INVALID);
return filter->priv->modify_types[index];
}
return gtk_tree_model_get_column_type (filter->priv->child_model, index);
}
/* A special case of _get_iter; this function can also get iters which
* are not visible. These iters should ONLY be passed internally, never
* pass those along with a signal emission.
*/
static gboolean
gtk_tree_model_filter_get_iter_full (GtkTreeModel *model,
GtkTreeIter *iter,
GtkTreePath *path)
{
GtkTreeModelFilter *filter = (GtkTreeModelFilter *)model;
gint *indices;
FilterLevel *level;
FilterElt *elt;
gint depth, i;
GSequenceIter *siter;
g_return_val_if_fail (GTK_IS_TREE_MODEL_FILTER (model), FALSE);
g_return_val_if_fail (filter->priv->child_model != NULL, FALSE);
indices = gtk_tree_path_get_indices (path);
if (filter->priv->root == NULL)
gtk_tree_model_filter_build_level (filter, NULL, NULL, FALSE);
level = FILTER_LEVEL (filter->priv->root);
depth = gtk_tree_path_get_depth (path);
if (!depth)
{
iter->stamp = 0;
return FALSE;
}
for (i = 0; i < depth - 1; i++)
{
if (!level || indices[i] >= g_sequence_get_length (level->seq))
{
iter->stamp = 0;
return FALSE;
}
siter = g_sequence_get_iter_at_pos (level->seq, indices[i]);
if (g_sequence_iter_is_end (siter))
{
iter->stamp = 0;
return FALSE;
}
elt = GET_ELT (siter);
if (!elt->children)
gtk_tree_model_filter_build_level (filter, level, elt, FALSE);
level = elt->children;
}
if (!level || indices[i] >= g_sequence_get_length (level->seq))
{
iter->stamp = 0;
return FALSE;
}
iter->stamp = filter->priv->stamp;
iter->user_data = level;
siter = g_sequence_get_iter_at_pos (level->seq, indices[depth - 1]);
if (g_sequence_iter_is_end (siter))
{
iter->stamp = 0;
return FALSE;
}
iter->user_data2 = GET_ELT (siter);
return TRUE;
}
static gboolean
gtk_tree_model_filter_get_iter (GtkTreeModel *model,
GtkTreeIter *iter,
GtkTreePath *path)
{
GtkTreeModelFilter *filter = (GtkTreeModelFilter *)model;
gint *indices;
FilterLevel *level;
FilterElt *elt;
GSequenceIter *siter;
gint depth, i;
g_return_val_if_fail (GTK_IS_TREE_MODEL_FILTER (model), FALSE);
g_return_val_if_fail (filter->priv->child_model != NULL, FALSE);
indices = gtk_tree_path_get_indices (path);
if (filter->priv->root == NULL)
gtk_tree_model_filter_build_level (filter, NULL, NULL, FALSE);
level = FILTER_LEVEL (filter->priv->root);
depth = gtk_tree_path_get_depth (path);
if (!depth)
{
iter->stamp = 0;
return FALSE;
}
for (i = 0; i < depth - 1; i++)
{
if (!level || indices[i] >= g_sequence_get_length (level->visible_seq))
{
iter->stamp = 0;
return FALSE;
}
siter = g_sequence_get_iter_at_pos (level->visible_seq, indices[i]);
if (g_sequence_iter_is_end (siter))
{
iter->stamp = 0;
return FALSE;
}
elt = GET_ELT (siter);
if (!elt->children)
gtk_tree_model_filter_build_level (filter, level, elt, FALSE);
level = elt->children;
}
if (!level || indices[i] >= g_sequence_get_length (level->visible_seq))
{
iter->stamp = 0;
return FALSE;
}
iter->stamp = filter->priv->stamp;
iter->user_data = level;
siter = g_sequence_get_iter_at_pos (level->visible_seq, indices[depth - 1]);
if (g_sequence_iter_is_end (siter))
{
iter->stamp = 0;
return FALSE;
}
iter->user_data2 = GET_ELT (siter);
return TRUE;
}
static GtkTreePath *
gtk_tree_model_filter_get_path (GtkTreeModel *model,
GtkTreeIter *iter)
{
GtkTreePath *retval;
FilterLevel *level;
FilterElt *elt;
g_return_val_if_fail (GTK_IS_TREE_MODEL_FILTER (model), NULL);
g_return_val_if_fail (GTK_TREE_MODEL_FILTER (model)->priv->child_model != NULL, NULL);
g_return_val_if_fail (GTK_TREE_MODEL_FILTER (model)->priv->stamp == iter->stamp, NULL);
level = iter->user_data;
elt = iter->user_data2;
if (!elt->visible_siter)
return NULL;
retval = gtk_tree_path_new ();
while (level)
{
gint index;
index = g_sequence_iter_get_position (elt->visible_siter);
gtk_tree_path_prepend_index (retval, index);
elt = level->parent_elt;
level = level->parent_level;
}
return retval;
}
static void
gtk_tree_model_filter_real_modify (GtkTreeModelFilter *self,
GtkTreeModel *child_model,
GtkTreeIter *iter,
GValue *value,
gint column)
{
if (self->priv->modify_func)
{
g_return_if_fail (column < self->priv->modify_n_columns);
g_value_init (value, self->priv->modify_types[column]);
self->priv->modify_func (GTK_TREE_MODEL (self),
iter,
value,
column,
self->priv->modify_data);
}
else
{
GtkTreeIter child_iter;
gtk_tree_model_filter_convert_iter_to_child_iter (GTK_TREE_MODEL_FILTER (self),
&child_iter, iter);
gtk_tree_model_get_value (child_model, &child_iter, column, value);
}
}
static void
gtk_tree_model_filter_get_value (GtkTreeModel *model,
GtkTreeIter *iter,
gint column,
GValue *value)
{
GtkTreeModelFilter *filter = GTK_TREE_MODEL_FILTER (model);
g_return_if_fail (GTK_IS_TREE_MODEL_FILTER (model));
g_return_if_fail (GTK_TREE_MODEL_FILTER (model)->priv->child_model != NULL);
g_return_if_fail (GTK_TREE_MODEL_FILTER (model)->priv->stamp == iter->stamp);
GTK_TREE_MODEL_FILTER_GET_CLASS (model)->modify (filter,
filter->priv->child_model, iter, value, column);
}
static gboolean
gtk_tree_model_filter_iter_next (GtkTreeModel *model,
GtkTreeIter *iter)
{
FilterLevel *level;
FilterElt *elt;
GSequenceIter *siter;
g_return_val_if_fail (GTK_IS_TREE_MODEL_FILTER (model), FALSE);
g_return_val_if_fail (GTK_TREE_MODEL_FILTER (model)->priv->child_model != NULL, FALSE);
g_return_val_if_fail (GTK_TREE_MODEL_FILTER (model)->priv->stamp == iter->stamp, FALSE);
level = iter->user_data;
elt = iter->user_data2;
siter = g_sequence_iter_next (elt->visible_siter);
if (g_sequence_iter_is_end (siter))
{
iter->stamp = 0;
return FALSE;
}
iter->user_data2 = GET_ELT (siter);
return TRUE;
}
static gboolean
gtk_tree_model_filter_iter_previous (GtkTreeModel *model,
GtkTreeIter *iter)
{
FilterElt *elt;
GSequenceIter *siter;
g_return_val_if_fail (GTK_IS_TREE_MODEL_FILTER (model), FALSE);
g_return_val_if_fail (GTK_TREE_MODEL_FILTER (model)->priv->child_model != NULL, FALSE);
g_return_val_if_fail (GTK_TREE_MODEL_FILTER (model)->priv->stamp == iter->stamp, FALSE);
elt = iter->user_data2;
siter = g_sequence_iter_prev (elt->visible_siter);
if (g_sequence_iter_is_begin (siter))
{
iter->stamp = 0;
return FALSE;
}
iter->user_data2 = GET_ELT (siter);
return TRUE;
}
static gboolean
gtk_tree_model_filter_iter_children (GtkTreeModel *model,
GtkTreeIter *iter,
GtkTreeIter *parent)
{
GtkTreeModelFilter *filter = (GtkTreeModelFilter *)model;
FilterLevel *level;
GSequenceIter *siter;
iter->stamp = 0;
g_return_val_if_fail (GTK_IS_TREE_MODEL_FILTER (model), FALSE);
g_return_val_if_fail (filter->priv->child_model != NULL, FALSE);
if (parent)
g_return_val_if_fail (filter->priv->stamp == parent->stamp, FALSE);
if (!parent)
{
if (!filter->priv->root)
gtk_tree_model_filter_build_level (filter, NULL, NULL, FALSE);
if (!filter->priv->root)
return FALSE;
level = filter->priv->root;
siter = g_sequence_get_begin_iter (level->visible_seq);
if (g_sequence_iter_is_end (siter))
{
iter->stamp = 0;
return FALSE;
}
iter->stamp = filter->priv->stamp;
iter->user_data = level;
iter->user_data2 = GET_ELT (siter);
return TRUE;
}
else
{
if (FILTER_ELT (parent->user_data2)->children == NULL)
gtk_tree_model_filter_build_level (filter,
FILTER_LEVEL (parent->user_data),
FILTER_ELT (parent->user_data2),
FALSE);
if (FILTER_ELT (parent->user_data2)->children == NULL)
return FALSE;
level = FILTER_ELT (parent->user_data2)->children;
siter = g_sequence_get_begin_iter (level->visible_seq);
if (g_sequence_iter_is_end (siter))
{
iter->stamp = 0;
return FALSE;
}
iter->stamp = filter->priv->stamp;
iter->user_data = level;
iter->user_data2 = GET_ELT (siter);
return TRUE;
}
iter->stamp = 0;
return FALSE;
}
static gboolean
gtk_tree_model_filter_iter_has_child (GtkTreeModel *model,
GtkTreeIter *iter)
{
GtkTreeIter child_iter;
GtkTreeModelFilter *filter = (GtkTreeModelFilter *)model;
FilterElt *elt;
g_return_val_if_fail (GTK_IS_TREE_MODEL_FILTER (model), FALSE);
g_return_val_if_fail (filter->priv->child_model != NULL, FALSE);
g_return_val_if_fail (filter->priv->stamp == iter->stamp, FALSE);
filter = GTK_TREE_MODEL_FILTER (model);
gtk_tree_model_filter_convert_iter_to_child_iter (GTK_TREE_MODEL_FILTER (model), &child_iter, iter);
elt = FILTER_ELT (iter->user_data2);
if (!elt->visible_siter)
return FALSE;
/* we need to build the level to check if not all children are filtered
* out
*/
if (!elt->children
&& gtk_tree_model_iter_has_child (filter->priv->child_model, &child_iter))
gtk_tree_model_filter_build_level (filter, FILTER_LEVEL (iter->user_data),
elt, FALSE);
if (elt->children && g_sequence_get_length (elt->children->visible_seq) > 0)
return TRUE;
return FALSE;
}
static gint
gtk_tree_model_filter_iter_n_children (GtkTreeModel *model,
GtkTreeIter *iter)
{
GtkTreeIter child_iter;
GtkTreeModelFilter *filter = (GtkTreeModelFilter *)model;
FilterElt *elt;
g_return_val_if_fail (GTK_IS_TREE_MODEL_FILTER (model), 0);
g_return_val_if_fail (filter->priv->child_model != NULL, 0);
if (iter)
g_return_val_if_fail (filter->priv->stamp == iter->stamp, 0);
if (!iter)
{
if (!filter->priv->root)
gtk_tree_model_filter_build_level (filter, NULL, NULL, FALSE);
if (filter->priv->root)
return g_sequence_get_length (FILTER_LEVEL (filter->priv->root)->visible_seq);
return 0;
}
elt = FILTER_ELT (iter->user_data2);
if (!elt->visible_siter)
return 0;
gtk_tree_model_filter_convert_iter_to_child_iter (GTK_TREE_MODEL_FILTER (model), &child_iter, iter);
if (!elt->children &&
gtk_tree_model_iter_has_child (filter->priv->child_model, &child_iter))
gtk_tree_model_filter_build_level (filter,
FILTER_LEVEL (iter->user_data),
elt, FALSE);
if (elt->children)
return g_sequence_get_length (elt->children->visible_seq);
return 0;
}
static gboolean
gtk_tree_model_filter_iter_nth_child (GtkTreeModel *model,
GtkTreeIter *iter,
GtkTreeIter *parent,
gint n)
{
FilterLevel *level;
GtkTreeIter children;
GSequenceIter *siter;
g_return_val_if_fail (GTK_IS_TREE_MODEL_FILTER (model), FALSE);
if (parent)
g_return_val_if_fail (GTK_TREE_MODEL_FILTER (model)->priv->stamp == parent->stamp, FALSE);
/* use this instead of has_child to force us to build the level, if needed */
if (gtk_tree_model_filter_iter_children (model, &children, parent) == FALSE)
{
iter->stamp = 0;
return FALSE;
}
level = children.user_data;
siter = g_sequence_get_iter_at_pos (level->visible_seq, n);
if (g_sequence_iter_is_end (siter))
return FALSE;
iter->stamp = GTK_TREE_MODEL_FILTER (model)->priv->stamp;
iter->user_data = level;
iter->user_data2 = GET_ELT (siter);
return TRUE;
}
static gboolean
gtk_tree_model_filter_iter_parent (GtkTreeModel *model,
GtkTreeIter *iter,
GtkTreeIter *child)
{
FilterLevel *level;
iter->stamp = 0;
g_return_val_if_fail (GTK_IS_TREE_MODEL_FILTER (model), FALSE);
g_return_val_if_fail (GTK_TREE_MODEL_FILTER (model)->priv->child_model != NULL, FALSE);
g_return_val_if_fail (GTK_TREE_MODEL_FILTER (model)->priv->stamp == child->stamp, FALSE);
level = child->user_data;
if (level->parent_level)
{
iter->stamp = GTK_TREE_MODEL_FILTER (model)->priv->stamp;
iter->user_data = level->parent_level;
iter->user_data2 = level->parent_elt;
return TRUE;
}
return FALSE;
}
static void
gtk_tree_model_filter_ref_node (GtkTreeModel *model,
GtkTreeIter *iter)
{
gtk_tree_model_filter_real_ref_node (model, iter, TRUE);
}
static void
gtk_tree_model_filter_real_ref_node (GtkTreeModel *model,
GtkTreeIter *iter,
gboolean external)
{
GtkTreeModelFilter *filter = (GtkTreeModelFilter *)model;
GtkTreeIter child_iter;
FilterLevel *level;
FilterElt *elt;
g_return_if_fail (GTK_IS_TREE_MODEL_FILTER (model));
g_return_if_fail (GTK_TREE_MODEL_FILTER (model)->priv->child_model != NULL);
g_return_if_fail (GTK_TREE_MODEL_FILTER (model)->priv->stamp == iter->stamp);
gtk_tree_model_filter_convert_iter_to_child_iter (GTK_TREE_MODEL_FILTER (model), &child_iter, iter);
gtk_tree_model_ref_node (filter->priv->child_model, &child_iter);
level = iter->user_data;
elt = iter->user_data2;
elt->ref_count++;
level->ref_count++;
if (external)
{
elt->ext_ref_count++;
level->ext_ref_count++;
if (level->ext_ref_count == 1)
{
FilterLevel *parent_level = level->parent_level;
FilterElt *parent_elt = level->parent_elt;
/* we were at zero -- time to decrease the zero_ref_count val */
while (parent_level)
{
parent_elt->zero_ref_count--;
parent_elt = parent_level->parent_elt;
parent_level = parent_level->parent_level;
}
if (filter->priv->root != level)
filter->priv->zero_ref_count--;
}
}
}
static void
gtk_tree_model_filter_unref_node (GtkTreeModel *model,
GtkTreeIter *iter)
{
gtk_tree_model_filter_real_unref_node (model, iter, TRUE, TRUE);
}
static void
gtk_tree_model_filter_real_unref_node (GtkTreeModel *model,
GtkTreeIter *iter,
gboolean external,
gboolean propagate_unref)
{
GtkTreeModelFilter *filter = (GtkTreeModelFilter *)model;
FilterLevel *level;
FilterElt *elt;
g_return_if_fail (GTK_IS_TREE_MODEL_FILTER (model));
g_return_if_fail (filter->priv->child_model != NULL);
g_return_if_fail (filter->priv->stamp == iter->stamp);
if (propagate_unref)
{
GtkTreeIter child_iter;
gtk_tree_model_filter_convert_iter_to_child_iter (GTK_TREE_MODEL_FILTER (model), &child_iter, iter);
gtk_tree_model_unref_node (filter->priv->child_model, &child_iter);
}
level = iter->user_data;
elt = iter->user_data2;
g_return_if_fail (elt->ref_count > 0);
elt->ref_count--;
level->ref_count--;
if (external)
{
elt->ext_ref_count--;
level->ext_ref_count--;
if (level->ext_ref_count == 0)
{
FilterLevel *parent_level = level->parent_level;
FilterElt *parent_elt = level->parent_elt;
/* we are at zero -- time to increase the zero_ref_count val */
while (parent_level)
{
parent_elt->zero_ref_count++;
parent_elt = parent_level->parent_elt;
parent_level = parent_level->parent_level;
}
if (filter->priv->root != level)
filter->priv->zero_ref_count++;
}
}
}
/* TreeDragSource interface implementation */
static gboolean
gtk_tree_model_filter_row_draggable (GtkTreeDragSource *drag_source,
GtkTreePath *path)
{
GtkTreeModelFilter *tree_model_filter = (GtkTreeModelFilter *)drag_source;
GtkTreePath *child_path;
gboolean draggable;
g_return_val_if_fail (GTK_IS_TREE_MODEL_FILTER (drag_source), FALSE);
g_return_val_if_fail (path != NULL, FALSE);
child_path = gtk_tree_model_filter_convert_path_to_child_path (tree_model_filter, path);
draggable = gtk_tree_drag_source_row_draggable (GTK_TREE_DRAG_SOURCE (tree_model_filter->priv->child_model), child_path);
gtk_tree_path_free (child_path);
return draggable;
}
static gboolean
gtk_tree_model_filter_drag_data_get (GtkTreeDragSource *drag_source,
GtkTreePath *path,
GtkSelectionData *selection_data)
{
GtkTreeModelFilter *tree_model_filter = (GtkTreeModelFilter *)drag_source;
GtkTreePath *child_path;
gboolean gotten;
g_return_val_if_fail (GTK_IS_TREE_MODEL_FILTER (drag_source), FALSE);
g_return_val_if_fail (path != NULL, FALSE);
child_path = gtk_tree_model_filter_convert_path_to_child_path (tree_model_filter, path);
gotten = gtk_tree_drag_source_drag_data_get (GTK_TREE_DRAG_SOURCE (tree_model_filter->priv->child_model), child_path, selection_data);
gtk_tree_path_free (child_path);
return gotten;
}
static gboolean
gtk_tree_model_filter_drag_data_delete (GtkTreeDragSource *drag_source,
GtkTreePath *path)
{
GtkTreeModelFilter *tree_model_filter = (GtkTreeModelFilter *)drag_source;
GtkTreePath *child_path;
gboolean deleted;
g_return_val_if_fail (GTK_IS_TREE_MODEL_FILTER (drag_source), FALSE);
g_return_val_if_fail (path != NULL, FALSE);
child_path = gtk_tree_model_filter_convert_path_to_child_path (tree_model_filter, path);
deleted = gtk_tree_drag_source_drag_data_delete (GTK_TREE_DRAG_SOURCE (tree_model_filter->priv->child_model), child_path);
gtk_tree_path_free (child_path);
return deleted;
}
/* bits and pieces */
static void
gtk_tree_model_filter_set_model (GtkTreeModelFilter *filter,
GtkTreeModel *child_model)
{
g_return_if_fail (GTK_IS_TREE_MODEL_FILTER (filter));
if (filter->priv->child_model)
{
g_signal_handler_disconnect (filter->priv->child_model,
filter->priv->changed_id);
g_signal_handler_disconnect (filter->priv->child_model,
filter->priv->inserted_id);
g_signal_handler_disconnect (filter->priv->child_model,
filter->priv->has_child_toggled_id);
g_signal_handler_disconnect (filter->priv->child_model,
filter->priv->deleted_id);
g_signal_handler_disconnect (filter->priv->child_model,
filter->priv->reordered_id);
/* reset our state */
if (filter->priv->root)
gtk_tree_model_filter_free_level (filter, filter->priv->root, TRUE);
filter->priv->root = NULL;
g_object_unref (filter->priv->child_model);
filter->priv->visible_column = -1;
/* FIXME: do we need to destroy more here? */
}
filter->priv->child_model = child_model;
if (child_model)
{
g_object_ref (filter->priv->child_model);
filter->priv->changed_id =
g_signal_connect (child_model, "row-changed",
G_CALLBACK (gtk_tree_model_filter_row_changed),
filter);
filter->priv->inserted_id =
g_signal_connect (child_model, "row-inserted",
G_CALLBACK (gtk_tree_model_filter_row_inserted),
filter);
filter->priv->has_child_toggled_id =
g_signal_connect (child_model, "row-has-child-toggled",
G_CALLBACK (gtk_tree_model_filter_row_has_child_toggled),
filter);
filter->priv->deleted_id =
g_signal_connect (child_model, "row-deleted",
G_CALLBACK (gtk_tree_model_filter_row_deleted),
filter);
filter->priv->reordered_id =
g_signal_connect (child_model, "rows-reordered",
G_CALLBACK (gtk_tree_model_filter_rows_reordered),
filter);
filter->priv->child_flags = gtk_tree_model_get_flags (child_model);
filter->priv->stamp = g_random_int ();
}
}
static void
gtk_tree_model_filter_ref_path (GtkTreeModelFilter *filter,
GtkTreePath *path)
{
int len;
GtkTreePath *p;
len = gtk_tree_path_get_depth (path);
p = gtk_tree_path_copy (path);
while (len--)
{
GtkTreeIter iter;
gtk_tree_model_get_iter (GTK_TREE_MODEL (filter->priv->child_model), &iter, p);
gtk_tree_model_ref_node (GTK_TREE_MODEL (filter->priv->child_model), &iter);
gtk_tree_path_up (p);
}
gtk_tree_path_free (p);
}
static void
gtk_tree_model_filter_unref_path (GtkTreeModelFilter *filter,
GtkTreePath *path,
int depth)
{
int len;
GtkTreePath *p;
if (depth != -1)
len = depth;
else
len = gtk_tree_path_get_depth (path);
p = gtk_tree_path_copy (path);
while (len--)
{
GtkTreeIter iter;
gtk_tree_model_get_iter (GTK_TREE_MODEL (filter->priv->child_model), &iter, p);
gtk_tree_model_unref_node (GTK_TREE_MODEL (filter->priv->child_model), &iter);
gtk_tree_path_up (p);
}
gtk_tree_path_free (p);
}
static void
gtk_tree_model_filter_set_root (GtkTreeModelFilter *filter,
GtkTreePath *root)
{
g_return_if_fail (GTK_IS_TREE_MODEL_FILTER (filter));
if (!root)
filter->priv->virtual_root = NULL;
else
filter->priv->virtual_root = gtk_tree_path_copy (root);
}
/* public API */
/**
* gtk_tree_model_filter_new:
* @child_model: A #GtkTreeModel.
* @root: (allow-none): A #GtkTreePath or %NULL.
*
* Creates a new #GtkTreeModel, with @child_model as the child_model
* and @root as the virtual root.
*
* Return value: (transfer full): A new #GtkTreeModel.
*
* Since: 2.4
*/
GtkTreeModel *
gtk_tree_model_filter_new (GtkTreeModel *child_model,
GtkTreePath *root)
{
GtkTreeModel *retval;
GtkTreeModelFilter *filter;
g_return_val_if_fail (GTK_IS_TREE_MODEL (child_model), NULL);
retval = g_object_new (GTK_TYPE_TREE_MODEL_FILTER,
"child-model", child_model,
"virtual-root", root,
NULL);
filter = GTK_TREE_MODEL_FILTER (retval);
if (filter->priv->virtual_root)
{
gtk_tree_model_filter_ref_path (filter, filter->priv->virtual_root);
filter->priv->virtual_root_deleted = FALSE;
}
return retval;
}
/**
* gtk_tree_model_filter_get_model:
* @filter: A #GtkTreeModelFilter.
*
* Returns a pointer to the child model of @filter.
*
* Return value: (transfer none): A pointer to a #GtkTreeModel.
*
* Since: 2.4
*/
GtkTreeModel *
gtk_tree_model_filter_get_model (GtkTreeModelFilter *filter)
{
g_return_val_if_fail (GTK_IS_TREE_MODEL_FILTER (filter), NULL);
return filter->priv->child_model;
}
/**
* gtk_tree_model_filter_set_visible_func:
* @filter: A #GtkTreeModelFilter.
* @func: A #GtkTreeModelFilterVisibleFunc, the visible function.
* @data: (allow-none): User data to pass to the visible function, or %NULL.
* @destroy: (allow-none): Destroy notifier of @data, or %NULL.
*
* Sets the visible function used when filtering the @filter to be @func. The
* function should return %TRUE if the given row should be visible and
* %FALSE otherwise.
*
* If the condition calculated by the function changes over time (e.g. because
* it depends on some global parameters), you must call
* gtk_tree_model_filter_refilter() to keep the visibility information of
* the model uptodate.
*
* Note that @func is called whenever a row is inserted, when it may still be
* empty. The visible function should therefore take special care of empty
* rows, like in the example below.
*
* <informalexample><programlisting>
* static gboolean
* visible_func (GtkTreeModel *model,
* GtkTreeIter *iter,
* gpointer data)
* {
* /&ast; Visible if row is non-empty and first column is "HI" &ast;/
* gchar *str;
* gboolean visible = FALSE;
*
* gtk_tree_model_get (model, iter, 0, &str, -1);
* if (str && strcmp (str, "HI") == 0)
* visible = TRUE;
* g_free (str);
*
* return visible;
* }
* </programlisting></informalexample>
*
* Since: 2.4
*/
void
gtk_tree_model_filter_set_visible_func (GtkTreeModelFilter *filter,
GtkTreeModelFilterVisibleFunc func,
gpointer data,
GDestroyNotify destroy)
{
g_return_if_fail (GTK_IS_TREE_MODEL_FILTER (filter));
g_return_if_fail (func != NULL);
g_return_if_fail (filter->priv->visible_method_set == FALSE);
filter->priv->visible_func = func;
filter->priv->visible_data = data;
filter->priv->visible_destroy = destroy;
filter->priv->visible_method_set = TRUE;
}
/**
* gtk_tree_model_filter_set_modify_func:
* @filter: A #GtkTreeModelFilter.
* @n_columns: The number of columns in the filter model.
* @types: (array length=n_columns): The #GType<!-- -->s of the columns.
* @func: A #GtkTreeModelFilterModifyFunc
* @data: (allow-none): User data to pass to the modify function, or %NULL.
* @destroy: (allow-none): Destroy notifier of @data, or %NULL.
*
* With the @n_columns and @types parameters, you give an array of column
* types for this model (which will be exposed to the parent model/view).
* The @func, @data and @destroy parameters are for specifying the modify
* function. The modify function will get called for <emphasis>each</emphasis>
* data access, the goal of the modify function is to return the data which
* should be displayed at the location specified using the parameters of the
* modify function.
*
* Since: 2.4
*/
void
gtk_tree_model_filter_set_modify_func (GtkTreeModelFilter *filter,
gint n_columns,
GType *types,
GtkTreeModelFilterModifyFunc func,
gpointer data,
GDestroyNotify destroy)
{
g_return_if_fail (GTK_IS_TREE_MODEL_FILTER (filter));
g_return_if_fail (func != NULL);
g_return_if_fail (filter->priv->modify_func_set == FALSE);
if (filter->priv->modify_destroy)
{
GDestroyNotify d = filter->priv->modify_destroy;
filter->priv->modify_destroy = NULL;
d (filter->priv->modify_data);
}
filter->priv->modify_n_columns = n_columns;
filter->priv->modify_types = g_new0 (GType, n_columns);
memcpy (filter->priv->modify_types, types, sizeof (GType) * n_columns);
filter->priv->modify_func = func;
filter->priv->modify_data = data;
filter->priv->modify_destroy = destroy;
filter->priv->modify_func_set = TRUE;
}
/**
* gtk_tree_model_filter_set_visible_column:
* @filter: A #GtkTreeModelFilter.
* @column: A #gint which is the column containing the visible information.
*
* Sets @column of the child_model to be the column where @filter should
* look for visibility information. @columns should be a column of type
* %G_TYPE_BOOLEAN, where %TRUE means that a row is visible, and %FALSE
* if not.
*
* Since: 2.4
*/
void
gtk_tree_model_filter_set_visible_column (GtkTreeModelFilter *filter,
gint column)
{
g_return_if_fail (GTK_IS_TREE_MODEL_FILTER (filter));
g_return_if_fail (column >= 0);
g_return_if_fail (filter->priv->visible_method_set == FALSE);
filter->priv->visible_column = column;
filter->priv->visible_method_set = TRUE;
}
/* conversion */
/**
* gtk_tree_model_filter_convert_child_iter_to_iter:
* @filter: A #GtkTreeModelFilter.
* @filter_iter: (out): An uninitialized #GtkTreeIter.
* @child_iter: A valid #GtkTreeIter pointing to a row on the child model.
*
* Sets @filter_iter to point to the row in @filter that corresponds to the
* row pointed at by @child_iter. If @filter_iter was not set, %FALSE is
* returned.
*
* Return value: %TRUE, if @filter_iter was set, i.e. if @child_iter is a
* valid iterator pointing to a visible row in child model.
*
* Since: 2.4
*/
gboolean
gtk_tree_model_filter_convert_child_iter_to_iter (GtkTreeModelFilter *filter,
GtkTreeIter *filter_iter,
GtkTreeIter *child_iter)
{
gboolean ret;
GtkTreePath *child_path, *path;
g_return_val_if_fail (GTK_IS_TREE_MODEL_FILTER (filter), FALSE);
g_return_val_if_fail (filter->priv->child_model != NULL, FALSE);
g_return_val_if_fail (filter_iter != NULL, FALSE);
g_return_val_if_fail (child_iter != NULL, FALSE);
g_return_val_if_fail (filter_iter != child_iter, FALSE);
filter_iter->stamp = 0;
child_path = gtk_tree_model_get_path (filter->priv->child_model, child_iter);
g_return_val_if_fail (child_path != NULL, FALSE);
path = gtk_tree_model_filter_convert_child_path_to_path (filter,
child_path);
gtk_tree_path_free (child_path);
if (!path)
return FALSE;
ret = gtk_tree_model_get_iter (GTK_TREE_MODEL (filter), filter_iter, path);
gtk_tree_path_free (path);
return ret;
}
/**
* gtk_tree_model_filter_convert_iter_to_child_iter:
* @filter: A #GtkTreeModelFilter.
* @child_iter: (out): An uninitialized #GtkTreeIter.
* @filter_iter: A valid #GtkTreeIter pointing to a row on @filter.
*
* Sets @child_iter to point to the row pointed to by @filter_iter.
*
* Since: 2.4
*/
void
gtk_tree_model_filter_convert_iter_to_child_iter (GtkTreeModelFilter *filter,
GtkTreeIter *child_iter,
GtkTreeIter *filter_iter)
{
g_return_if_fail (GTK_IS_TREE_MODEL_FILTER (filter));
g_return_if_fail (filter->priv->child_model != NULL);
g_return_if_fail (child_iter != NULL);
g_return_if_fail (filter_iter != NULL);
g_return_if_fail (filter_iter->stamp == filter->priv->stamp);
g_return_if_fail (filter_iter != child_iter);
if (GTK_TREE_MODEL_FILTER_CACHE_CHILD_ITERS (filter))
{
*child_iter = FILTER_ELT (filter_iter->user_data2)->iter;
}
else
{
GtkTreePath *path;
gboolean valid = FALSE;
path = gtk_tree_model_filter_elt_get_path (filter_iter->user_data,
filter_iter->user_data2,
filter->priv->virtual_root);
valid = gtk_tree_model_get_iter (filter->priv->child_model, child_iter,
path);
gtk_tree_path_free (path);
g_return_if_fail (valid == TRUE);
}
}
/* The path returned can only be used internally in the filter model. */
static GtkTreePath *
gtk_real_tree_model_filter_convert_child_path_to_path (GtkTreeModelFilter *filter,
GtkTreePath *child_path,
gboolean build_levels,
gboolean fetch_children)
{
gint *child_indices;
GtkTreePath *retval;
GtkTreePath *real_path;
FilterLevel *level;
FilterElt *tmp;
gint i;
g_return_val_if_fail (GTK_IS_TREE_MODEL_FILTER (filter), NULL);
g_return_val_if_fail (filter->priv->child_model != NULL, NULL);
g_return_val_if_fail (child_path != NULL, NULL);
if (!filter->priv->virtual_root)
real_path = gtk_tree_path_copy (child_path);
else
real_path = gtk_tree_model_filter_remove_root (child_path,
filter->priv->virtual_root);
if (!real_path)
return NULL;
retval = gtk_tree_path_new ();
child_indices = gtk_tree_path_get_indices (real_path);
if (filter->priv->root == NULL && build_levels)
gtk_tree_model_filter_build_level (filter, NULL, NULL, FALSE);
level = FILTER_LEVEL (filter->priv->root);
for (i = 0; i < gtk_tree_path_get_depth (real_path); i++)
{
GSequenceIter *siter;
gboolean found_child = FALSE;
if (!level)
{
gtk_tree_path_free (real_path);
gtk_tree_path_free (retval);
return NULL;
}
tmp = lookup_elt_with_offset (level->seq, child_indices[i], &siter);
if (tmp)
{
gtk_tree_path_append_index (retval, g_sequence_iter_get_position (siter));
if (!tmp->children && build_levels)
gtk_tree_model_filter_build_level (filter, level, tmp, FALSE);
level = tmp->children;
found_child = TRUE;
}
if (!found_child && fetch_children)
{
int j;
tmp = gtk_tree_model_filter_fetch_child (filter, level,
child_indices[i],
&j);
/* didn't find the child, let's try to bring it back */
if (!tmp || tmp->offset != child_indices[i])
{
/* not there */
gtk_tree_path_free (real_path);
gtk_tree_path_free (retval);
return NULL;
}
gtk_tree_path_append_index (retval, j);
if (!tmp->children && build_levels)
gtk_tree_model_filter_build_level (filter, level, tmp, FALSE);
level = tmp->children;
found_child = TRUE;
}
else if (!found_child && !fetch_children)
{
/* no path */
gtk_tree_path_free (real_path);
gtk_tree_path_free (retval);
return NULL;
}
}
gtk_tree_path_free (real_path);
return retval;
}
/**
* gtk_tree_model_filter_convert_child_path_to_path:
* @filter: A #GtkTreeModelFilter.
* @child_path: A #GtkTreePath to convert.
*
* Converts @child_path to a path relative to @filter. That is, @child_path
* points to a path in the child model. The rerturned path will point to the
* same row in the filtered model. If @child_path isn't a valid path on the
* child model or points to a row which is not visible in @filter, then %NULL
* is returned.
*
* Return value: A newly allocated #GtkTreePath, or %NULL.
*
* Since: 2.4
*/
GtkTreePath *
gtk_tree_model_filter_convert_child_path_to_path (GtkTreeModelFilter *filter,
GtkTreePath *child_path)
{
GtkTreeIter iter;
GtkTreePath *path;
/* this function does the sanity checks */
path = gtk_real_tree_model_filter_convert_child_path_to_path (filter,
child_path,
TRUE,
TRUE);
if (!path)
return NULL;
/* get a new path which only takes visible nodes into account.
* -- if this gives any performance issues, we can write a special
* version of convert_child_path_to_path immediately returning
* a visible-nodes-only path.
*/
gtk_tree_model_filter_get_iter_full (GTK_TREE_MODEL (filter), &iter, path);
gtk_tree_path_free (path);
path = gtk_tree_model_get_path (GTK_TREE_MODEL (filter), &iter);
return path;
}
/**
* gtk_tree_model_filter_convert_path_to_child_path:
* @filter: A #GtkTreeModelFilter.
* @filter_path: A #GtkTreePath to convert.
*
* Converts @filter_path to a path on the child model of @filter. That is,
* @filter_path points to a location in @filter. The returned path will
* point to the same location in the model not being filtered. If @filter_path
* does not point to a location in the child model, %NULL is returned.
*
* Return value: A newly allocated #GtkTreePath, or %NULL.
*
* Since: 2.4
*/
GtkTreePath *
gtk_tree_model_filter_convert_path_to_child_path (GtkTreeModelFilter *filter,
GtkTreePath *filter_path)
{
gint *filter_indices;
GtkTreePath *retval;
FilterLevel *level;
gint i;
g_return_val_if_fail (GTK_IS_TREE_MODEL_FILTER (filter), NULL);
g_return_val_if_fail (filter->priv->child_model != NULL, NULL);
g_return_val_if_fail (filter_path != NULL, NULL);
/* convert path */
retval = gtk_tree_path_new ();
filter_indices = gtk_tree_path_get_indices (filter_path);
if (!filter->priv->root)
gtk_tree_model_filter_build_level (filter, NULL, NULL, FALSE);
level = FILTER_LEVEL (filter->priv->root);
for (i = 0; i < gtk_tree_path_get_depth (filter_path); i++)
{
FilterElt *elt;
GSequenceIter *siter;
if (!level)
{
gtk_tree_path_free (retval);
return NULL;
}
siter = g_sequence_get_iter_at_pos (level->visible_seq, filter_indices[i]);
if (g_sequence_iter_is_end (siter))
{
gtk_tree_path_free (retval);
return NULL;
}
elt = GET_ELT (siter);
if (elt->children == NULL)
gtk_tree_model_filter_build_level (filter, level, elt, FALSE);
gtk_tree_path_append_index (retval, elt->offset);
level = elt->children;
}
/* apply vroot */
if (filter->priv->virtual_root)
{
GtkTreePath *real_retval;
real_retval = gtk_tree_model_filter_add_root (retval,
filter->priv->virtual_root);
gtk_tree_path_free (retval);
return real_retval;
}
return retval;
}
static gboolean
gtk_tree_model_filter_refilter_helper (GtkTreeModel *model,
GtkTreePath *path,
GtkTreeIter *iter,
gpointer data)
{
/* evil, don't try this at home, but certainly speeds things up */
gtk_tree_model_filter_row_changed (model, path, iter, data);
return FALSE;
}
/**
* gtk_tree_model_filter_refilter:
* @filter: A #GtkTreeModelFilter.
*
* Emits ::row_changed for each row in the child model, which causes
* the filter to re-evaluate whether a row is visible or not.
*
* Since: 2.4
*/
void
gtk_tree_model_filter_refilter (GtkTreeModelFilter *filter)
{
g_return_if_fail (GTK_IS_TREE_MODEL_FILTER (filter));
/* S L O W */
gtk_tree_model_foreach (filter->priv->child_model,
gtk_tree_model_filter_refilter_helper,
filter);
}
/**
* gtk_tree_model_filter_clear_cache:
* @filter: A #GtkTreeModelFilter.
*
* This function should almost never be called. It clears the @filter
* of any cached iterators that haven't been reffed with
* gtk_tree_model_ref_node(). This might be useful if the child model
* being filtered is static (and doesn't change often) and there has been
* a lot of unreffed access to nodes. As a side effect of this function,
* all unreffed iters will be invalid.
*
* Since: 2.4
*/
void
gtk_tree_model_filter_clear_cache (GtkTreeModelFilter *filter)
{
g_return_if_fail (GTK_IS_TREE_MODEL_FILTER (filter));
if (filter->priv->zero_ref_count > 0)
gtk_tree_model_filter_clear_cache_helper (filter,
FILTER_LEVEL (filter->priv->root));
}
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