/*
* Copyright © 2011 Canonical Ltd.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*
* Author: Ryan Lortie <desrt@desrt.ca>
*/
#include "config.h"
#include "gmenumodel.h"
#include "glibintl.h"
/**
* SECTION:gmenumodel
* @title: GMenuModel
* @short_description: An abstract class representing the contents of a menu
* @include: gio/gio.h
* @see_also: #GActionGroup
*
* #GMenuModel represents the contents of a menu -- an ordered list of
* menu items. The items are associated with actions, which can be
* activated through them. Items can be grouped in sections, and may
* have submenus associated with them. Both items and sections usually
* have some representation data, such as labels or icons. The type of
* the associated action (ie whether it is stateful, and what kind of
* state it has) can influence the representation of the item.
*
* The conceptual model of menus in #GMenuModel is hierarchical:
* sections and submenus are again represented by #GMenuModels.
* Menus themselves do not define their own roles. Rather, the role
* of a particular #GMenuModel is defined by the item that references
* it (or, in the case of the 'root' menu, is defined by the context
* in which it is used).
*
* As an example, consider the visible portions of this menu:
*
* ## An example menu # {#menu-example}
*
* 
*
* There are 8 "menus" visible in the screenshot: one menubar, two
* submenus and 5 sections:
*
* - the toplevel menubar (containing 4 items)
* - the View submenu (containing 3 sections)
* - the first section of the View submenu (containing 2 items)
* - the second section of the View submenu (containing 1 item)
* - the final section of the View submenu (containing 1 item)
* - the Highlight Mode submenu (containing 2 sections)
* - the Sources section (containing 2 items)
* - the Markup section (containing 2 items)
*
* The [example][menu-model] illustrates the conceptual connection between
* these 8 menus. Each large block in the figure represents a menu and the
* smaller blocks within the large block represent items in that menu. Some
* items contain references to other menus.
*
* ## A menu example # {#menu-model}
*
* 
*
* Notice that the separators visible in the [example][menu-example]
* appear nowhere in the [menu model][menu-model]. This is because
* separators are not explicitly represented in the menu model. Instead,
* a separator is inserted between any two non-empty sections of a menu.
* Section items can have labels just like any other item. In that case,
* a display system may show a section header instead of a separator.
*
* The motivation for this abstract model of application controls is
* that modern user interfaces tend to make these controls available
* outside the application. Examples include global menus, jumplists,
* dash boards, etc. To support such uses, it is necessary to 'export'
* information about actions and their representation in menus, which
* is exactly what the [GActionGroup exporter][gio-GActionGroup-exporter]
* and the [GMenuModel exporter][gio-GMenuModel-exporter] do for
* #GActionGroup and #GMenuModel. The client-side counterparts to
* make use of the exported information are #GDBusActionGroup and
* #GDBusMenuModel.
*
* The API of #GMenuModel is very generic, with iterators for the
* attributes and links of an item, see g_menu_model_iterate_item_attributes()
* and g_menu_model_iterate_item_links(). The 'standard' attributes and
* link types have predefined names: %G_MENU_ATTRIBUTE_LABEL,
* %G_MENU_ATTRIBUTE_ACTION, %G_MENU_ATTRIBUTE_TARGET, %G_MENU_LINK_SECTION
* and %G_MENU_LINK_SUBMENU.
*
* Items in a #GMenuModel represent active controls if they refer to
* an action that can get activated when the user interacts with the
* menu item. The reference to the action is encoded by the string id
* in the %G_MENU_ATTRIBUTE_ACTION attribute. An action id uniquely
* identifies an action in an action group. Which action group(s) provide
* actions depends on the context in which the menu model is used.
* E.g. when the model is exported as the application menu of a
* #GtkApplication, actions can be application-wide or window-specific
* (and thus come from two different action groups). By convention, the
* application-wide actions have names that start with "app.", while the
* names of window-specific actions start with "win.".
*
* While a wide variety of stateful actions is possible, the following
* is the minimum that is expected to be supported by all users of exported
* menu information:
* - an action with no parameter type and no state
* - an action with no parameter type and boolean state
* - an action with string parameter type and string state
*
* ## Stateless
*
* A stateless action typically corresponds to an ordinary menu item.
*
* Selecting such a menu item will activate the action (with no parameter).
*
* ## Boolean State
*
* An action with a boolean state will most typically be used with a "toggle"
* or "switch" menu item. The state can be set directly, but activating the
* action (with no parameter) results in the state being toggled.
*
* Selecting a toggle menu item will activate the action. The menu item should
* be rendered as "checked" when the state is true.
*
* ## String Parameter and State
*
* Actions with string parameters and state will most typically be used to
* represent an enumerated choice over the items available for a group of
* radio menu items. Activating the action with a string parameter is
* equivalent to setting that parameter as the state.
*
* Radio menu items, in addition to being associated with the action, will
* have a target value. Selecting that menu item will result in activation
* of the action with the target value as the parameter. The menu item should
* be rendered as "selected" when the state of the action is equal to the
* target value of the menu item.
*/
/**
* GMenuModel:
*
* #GMenuModel is an opaque structure type. You must access it using the
* functions below.
*
* Since: 2.32
*/
/**
* GMenuAttributeIter:
*
* #GMenuAttributeIter is an opaque structure type. You must access it
* using the functions below.
*
* Since: 2.32
*/
/**
* GMenuLinkIter:
*
* #GMenuLinkIter is an opaque structure type. You must access it using
* the functions below.
*
* Since: 2.32
*/
typedef struct
{
GMenuLinkIter parent_instance;
GHashTableIter iter;
GHashTable *table;
} GMenuLinkHashIter;
typedef GMenuLinkIterClass GMenuLinkHashIterClass;
static GType g_menu_link_hash_iter_get_type (void);
G_DEFINE_TYPE (GMenuLinkHashIter, g_menu_link_hash_iter, G_TYPE_MENU_LINK_ITER)
static gboolean
g_menu_link_hash_iter_get_next (GMenuLinkIter *link_iter,
const gchar **out_name,
GMenuModel **value)
{
GMenuLinkHashIter *iter = (GMenuLinkHashIter *) link_iter;
gpointer keyptr, valueptr;
if (!g_hash_table_iter_next (&iter->iter, &keyptr, &valueptr))
return FALSE;
*out_name = keyptr;
*value = g_object_ref (valueptr);
return TRUE;
}
static void
g_menu_link_hash_iter_finalize (GObject *object)
{
GMenuLinkHashIter *iter = (GMenuLinkHashIter *) object;
g_hash_table_unref (iter->table);
G_OBJECT_CLASS (g_menu_link_hash_iter_parent_class)
->finalize (object);
}
static void
g_menu_link_hash_iter_init (GMenuLinkHashIter *iter)
{
}
static void
g_menu_link_hash_iter_class_init (GMenuLinkHashIterClass *class)
{
GObjectClass *object_class = G_OBJECT_CLASS (class);
object_class->finalize = g_menu_link_hash_iter_finalize;
class->get_next = g_menu_link_hash_iter_get_next;
}
typedef struct
{
GMenuAttributeIter parent_instance;
GHashTableIter iter;
GHashTable *table;
} GMenuAttributeHashIter;
typedef GMenuAttributeIterClass GMenuAttributeHashIterClass;
static GType g_menu_attribute_hash_iter_get_type (void);
G_DEFINE_TYPE (GMenuAttributeHashIter, g_menu_attribute_hash_iter, G_TYPE_MENU_ATTRIBUTE_ITER)
static gboolean
g_menu_attribute_hash_iter_get_next (GMenuAttributeIter *attr_iter,
const gchar **name,
GVariant **value)
{
GMenuAttributeHashIter *iter = (GMenuAttributeHashIter *) attr_iter;
gpointer keyptr, valueptr;
if (!g_hash_table_iter_next (&iter->iter, &keyptr, &valueptr))
return FALSE;
*name = keyptr;
*value = g_variant_ref (valueptr);
return TRUE;
}
static void
g_menu_attribute_hash_iter_finalize (GObject *object)
{
GMenuAttributeHashIter *iter = (GMenuAttributeHashIter *) object;
g_hash_table_unref (iter->table);
G_OBJECT_CLASS (g_menu_attribute_hash_iter_parent_class)
->finalize (object);
}
static void
g_menu_attribute_hash_iter_init (GMenuAttributeHashIter *iter)
{
}
static void
g_menu_attribute_hash_iter_class_init (GMenuAttributeHashIterClass *class)
{
GObjectClass *object_class = G_OBJECT_CLASS (class);
object_class->finalize = g_menu_attribute_hash_iter_finalize;
class->get_next = g_menu_attribute_hash_iter_get_next;
}
G_DEFINE_ABSTRACT_TYPE (GMenuModel, g_menu_model, G_TYPE_OBJECT)
static guint g_menu_model_items_changed_signal;
static GMenuAttributeIter *
g_menu_model_real_iterate_item_attributes (GMenuModel *model,
gint item_index)
{
GHashTable *table = NULL;
GMenuAttributeIter *result;
G_MENU_MODEL_GET_CLASS (model)->get_item_attributes (model, item_index, &table);
if (table)
{
GMenuAttributeHashIter *iter = g_object_new (g_menu_attribute_hash_iter_get_type (), NULL);
g_hash_table_iter_init (&iter->iter, table);
iter->table = g_hash_table_ref (table);
result = G_MENU_ATTRIBUTE_ITER (iter);
}
else
{
g_critical ("GMenuModel implementation '%s' doesn't override iterate_item_attributes() "
"and fails to return sane values from get_item_attributes()",
G_OBJECT_TYPE_NAME (model));
result = NULL;
}
if (table != NULL)
g_hash_table_unref (table);
return result;
}
static GVariant *
g_menu_model_real_get_item_attribute_value (GMenuModel *model,
gint item_index,
const gchar *attribute,
const GVariantType *expected_type)
{
GHashTable *table = NULL;
GVariant *value = NULL;
G_MENU_MODEL_GET_CLASS (model)
->get_item_attributes (model, item_index, &table);
if (table != NULL)
{
value = g_hash_table_lookup (table, attribute);
if (value != NULL)
{
if (expected_type == NULL || g_variant_is_of_type (value, expected_type))
value = g_variant_ref (value);
else
value = NULL;
}
}
else
g_assert_not_reached ();
if (table != NULL)
g_hash_table_unref (table);
return value;
}
static GMenuLinkIter *
g_menu_model_real_iterate_item_links (GMenuModel *model,
gint item_index)
{
GHashTable *table = NULL;
GMenuLinkIter *result;
G_MENU_MODEL_GET_CLASS (model)
->get_item_links (model, item_index, &table);
if (table)
{
GMenuLinkHashIter *iter = g_object_new (g_menu_link_hash_iter_get_type (), NULL);
g_hash_table_iter_init (&iter->iter, table);
iter->table = g_hash_table_ref (table);
result = G_MENU_LINK_ITER (iter);
}
else
{
g_critical ("GMenuModel implementation '%s' doesn't override iterate_item_links() "
"and fails to return sane values from get_item_links()",
G_OBJECT_TYPE_NAME (model));
result = NULL;
}
if (table != NULL)
g_hash_table_unref (table);
return result;
}
static GMenuModel *
g_menu_model_real_get_item_link (GMenuModel *model,
gint item_index,
const gchar *link)
{
GHashTable *table = NULL;
GMenuModel *value = NULL;
G_MENU_MODEL_GET_CLASS (model)
->get_item_links (model, item_index, &table);
if (table != NULL)
value = g_hash_table_lookup (table, link);
else
g_assert_not_reached ();
if (value != NULL)
g_object_ref (value);
if (table != NULL)
g_hash_table_unref (table);
return value;
}
static void
g_menu_model_init (GMenuModel *model)
{
}
static void
g_menu_model_class_init (GMenuModelClass *class)
{
class->iterate_item_attributes = g_menu_model_real_iterate_item_attributes;
class->get_item_attribute_value = g_menu_model_real_get_item_attribute_value;
class->iterate_item_links = g_menu_model_real_iterate_item_links;
class->get_item_link = g_menu_model_real_get_item_link;
/**
* GMenuModel::items-changed:
* @model: the #GMenuModel that is changing
* @position: the position of the change
* @removed: the number of items removed
* @added: the number of items added
*
* Emitted when a change has occured to the menu.
*
* The only changes that can occur to a menu is that items are removed
* or added. Items may not change (except by being removed and added
* back in the same location). This signal is capable of describing
* both of those changes (at the same time).
*
* The signal means that starting at the index @position, @removed
* items were removed and @added items were added in their place. If
* @removed is zero then only items were added. If @added is zero
* then only items were removed.
*
* As an example, if the menu contains items a, b, c, d (in that
* order) and the signal (2, 1, 3) occurs then the new composition of
* the menu will be a, b, _, _, _, d (with each _ representing some
* new item).
*
* Signal handlers may query the model (particularly the added items)
* and expect to see the results of the modification that is being
* reported. The signal is emitted after the modification.
**/
g_menu_model_items_changed_signal =
g_signal_new (I_("items-changed"), G_TYPE_MENU_MODEL,
G_SIGNAL_RUN_LAST, 0, NULL, NULL,
g_cclosure_marshal_generic, G_TYPE_NONE,
3, G_TYPE_INT, G_TYPE_INT, G_TYPE_INT);
}
/**
* g_menu_model_is_mutable:
* @model: a #GMenuModel
*
* Queries if @model is mutable.
*
* An immutable #GMenuModel will never emit the #GMenuModel::items-changed
* signal. Consumers of the model may make optimisations accordingly.
*
* Returns: %TRUE if the model is mutable (ie: "items-changed" may be
* emitted).
*
* Since: 2.32
*/
gboolean
g_menu_model_is_mutable (GMenuModel *model)
{
return G_MENU_MODEL_GET_CLASS (model)
->is_mutable (model);
}
/**
* g_menu_model_get_n_items:
* @model: a #GMenuModel
*
* Query the number of items in @model.
*
* Returns: the number of items
*
* Since: 2.32
*/
gint
g_menu_model_get_n_items (GMenuModel *model)
{
return G_MENU_MODEL_GET_CLASS (model)
->get_n_items (model);
}
/**
* g_menu_model_iterate_item_attributes:
* @model: a #GMenuModel
* @item_index: the index of the item
*
* Creates a #GMenuAttributeIter to iterate over the attributes of
* the item at position @item_index in @model.
*
* You must free the iterator with g_object_unref() when you are done.
*
* Returns: (transfer full): a new #GMenuAttributeIter
*
* Since: 2.32
*/
GMenuAttributeIter *
g_menu_model_iterate_item_attributes (GMenuModel *model,
gint item_index)
{
return G_MENU_MODEL_GET_CLASS (model)
->iterate_item_attributes (model, item_index);
}
/**
* g_menu_model_get_item_attribute_value:
* @model: a #GMenuModel
* @item_index: the index of the item
* @attribute: the attribute to query
* @expected_type: (nullable): the expected type of the attribute, or
* %NULL
*
* Queries the item at position @item_index in @model for the attribute
* specified by @attribute.
*
* If @expected_type is non-%NULL then it specifies the expected type of
* the attribute. If it is %NULL then any type will be accepted.
*
* If the attribute exists and matches @expected_type (or if the
* expected type is unspecified) then the value is returned.
*
* If the attribute does not exist, or does not match the expected type
* then %NULL is returned.
*
* Returns: (transfer full): the value of the attribute
*
* Since: 2.32
*/
GVariant *
g_menu_model_get_item_attribute_value (GMenuModel *model,
gint item_index,
const gchar *attribute,
const GVariantType *expected_type)
{
return G_MENU_MODEL_GET_CLASS (model)
->get_item_attribute_value (model, item_index, attribute, expected_type);
}
/**
* g_menu_model_get_item_attribute:
* @model: a #GMenuModel
* @item_index: the index of the item
* @attribute: the attribute to query
* @format_string: a #GVariant format string
* @...: positional parameters, as per @format_string
*
* Queries item at position @item_index in @model for the attribute
* specified by @attribute.
*
* If the attribute exists and matches the #GVariantType corresponding
* to @format_string then @format_string is used to deconstruct the
* value into the positional parameters and %TRUE is returned.
*
* If the attribute does not exist, or it does exist but has the wrong
* type, then the positional parameters are ignored and %FALSE is
* returned.
*
* This function is a mix of g_menu_model_get_item_attribute_value() and
* g_variant_get(), followed by a g_variant_unref(). As such,
* @format_string must make a complete copy of the data (since the
* #GVariant may go away after the call to g_variant_unref()). In
* particular, no '&' characters are allowed in @format_string.
*
* Returns: %TRUE if the named attribute was found with the expected
* type
*
* Since: 2.32
*/
gboolean
g_menu_model_get_item_attribute (GMenuModel *model,
gint item_index,
const gchar *attribute,
const gchar *format_string,
...)
{
GVariant *value;
va_list ap;
value = g_menu_model_get_item_attribute_value (model, item_index, attribute, NULL);
if (value == NULL)
return FALSE;
if (!g_variant_check_format_string (value, format_string, TRUE))
{
g_variant_unref (value);
return FALSE;
}
va_start (ap, format_string);
g_variant_get_va (value, format_string, NULL, &ap);
g_variant_unref (value);
va_end (ap);
return TRUE;
}
/**
* g_menu_model_iterate_item_links:
* @model: a #GMenuModel
* @item_index: the index of the item
*
* Creates a #GMenuLinkIter to iterate over the links of the item at
* position @item_index in @model.
*
* You must free the iterator with g_object_unref() when you are done.
*
* Returns: (transfer full): a new #GMenuLinkIter
*
* Since: 2.32
*/
GMenuLinkIter *
g_menu_model_iterate_item_links (GMenuModel *model,
gint item_index)
{
return G_MENU_MODEL_GET_CLASS (model)
->iterate_item_links (model, item_index);
}
/**
* g_menu_model_get_item_link:
* @model: a #GMenuModel
* @item_index: the index of the item
* @link: the link to query
*
* Queries the item at position @item_index in @model for the link
* specified by @link.
*
* If the link exists, the linked #GMenuModel is returned. If the link
* does not exist, %NULL is returned.
*
* Returns: (transfer full): the linked #GMenuModel, or %NULL
*
* Since: 2.32
*/
GMenuModel *
g_menu_model_get_item_link (GMenuModel *model,
gint item_index,
const gchar *link)
{
return G_MENU_MODEL_GET_CLASS (model)
->get_item_link (model, item_index, link);
}
/**
* g_menu_model_items_changed:
* @model: a #GMenuModel
* @position: the position of the change
* @removed: the number of items removed
* @added: the number of items added
*
* Requests emission of the #GMenuModel::items-changed signal on @model.
*
* This function should never be called except by #GMenuModel
* subclasses. Any other calls to this function will very likely lead
* to a violation of the interface of the model.
*
* The implementation should update its internal representation of the
* menu before emitting the signal. The implementation should further
* expect to receive queries about the new state of the menu (and
* particularly added menu items) while signal handlers are running.
*
* The implementation must dispatch this call directly from a mainloop
* entry and not in response to calls -- particularly those from the
* #GMenuModel API. Said another way: the menu must not change while
* user code is running without returning to the mainloop.
*
* Since: 2.32
*/
void
g_menu_model_items_changed (GMenuModel *model,
gint position,
gint removed,
gint added)
{
g_signal_emit (model, g_menu_model_items_changed_signal, 0, position, removed, added);
}
struct _GMenuAttributeIterPrivate
{
GQuark name;
GVariant *value;
gboolean valid;
};
G_DEFINE_ABSTRACT_TYPE_WITH_PRIVATE (GMenuAttributeIter, g_menu_attribute_iter, G_TYPE_OBJECT)
/**
* g_menu_attribute_iter_get_next:
* @iter: a #GMenuAttributeIter
* @out_name: (out) (optional) (transfer none): the type of the attribute
* @value: (out) (optional) (transfer full): the attribute value
*
* This function combines g_menu_attribute_iter_next() with
* g_menu_attribute_iter_get_name() and g_menu_attribute_iter_get_value().
*
* First the iterator is advanced to the next (possibly first) attribute.
* If that fails, then %FALSE is returned and there are no other
* effects.
*
* If successful, @name and @value are set to the name and value of the
* attribute that has just been advanced to. At this point,
* g_menu_attribute_iter_get_name() and g_menu_attribute_iter_get_value() will
* return the same values again.
*
* The value returned in @name remains valid for as long as the iterator
* remains at the current position. The value returned in @value must
* be unreffed using g_variant_unref() when it is no longer in use.
*
* Returns: %TRUE on success, or %FALSE if there is no additional
* attribute
*
* Since: 2.32
*/
gboolean
g_menu_attribute_iter_get_next (GMenuAttributeIter *iter,
const gchar **out_name,
GVariant **value)
{
const gchar *name;
if (iter->priv->value)
{
g_variant_unref (iter->priv->value);
iter->priv->value = NULL;
}
iter->priv->valid = G_MENU_ATTRIBUTE_ITER_GET_CLASS (iter)
->get_next (iter, &name, &iter->priv->value);
if (iter->priv->valid)
{
iter->priv->name = g_quark_from_string (name);
if (out_name)
*out_name = g_quark_to_string (iter->priv->name);
if (value)
*value = g_variant_ref (iter->priv->value);
}
return iter->priv->valid;
}
/**
* g_menu_attribute_iter_next:
* @iter: a #GMenuAttributeIter
*
* Attempts to advance the iterator to the next (possibly first)
* attribute.
*
* %TRUE is returned on success, or %FALSE if there are no more
* attributes.
*
* You must call this function when you first acquire the iterator
* to advance it to the first attribute (and determine if the first
* attribute exists at all).
*
* Returns: %TRUE on success, or %FALSE when there are no more attributes
*
* Since: 2.32
*/
gboolean
g_menu_attribute_iter_next (GMenuAttributeIter *iter)
{
return g_menu_attribute_iter_get_next (iter, NULL, NULL);
}
/**
* g_menu_attribute_iter_get_name:
* @iter: a #GMenuAttributeIter
*
* Gets the name of the attribute at the current iterator position, as
* a string.
*
* The iterator is not advanced.
*
* Returns: the name of the attribute
*
* Since: 2.32
*/
const gchar *
g_menu_attribute_iter_get_name (GMenuAttributeIter *iter)
{
g_return_val_if_fail (iter->priv->valid, 0);
return g_quark_to_string (iter->priv->name);
}
/**
* g_menu_attribute_iter_get_value:
* @iter: a #GMenuAttributeIter
*
* Gets the value of the attribute at the current iterator position.
*
* The iterator is not advanced.
*
* Returns: (transfer full): the value of the current attribute
*
* Since: 2.32
*/
GVariant *
g_menu_attribute_iter_get_value (GMenuAttributeIter *iter)
{
g_return_val_if_fail (iter->priv->valid, NULL);
return g_variant_ref (iter->priv->value);
}
static void
g_menu_attribute_iter_finalize (GObject *object)
{
GMenuAttributeIter *iter = G_MENU_ATTRIBUTE_ITER (object);
if (iter->priv->value)
g_variant_unref (iter->priv->value);
G_OBJECT_CLASS (g_menu_attribute_iter_parent_class)
->finalize (object);
}
static void
g_menu_attribute_iter_init (GMenuAttributeIter *iter)
{
iter->priv = g_menu_attribute_iter_get_instance_private (iter);
}
static void
g_menu_attribute_iter_class_init (GMenuAttributeIterClass *class)
{
GObjectClass *object_class = G_OBJECT_CLASS (class);
object_class->finalize = g_menu_attribute_iter_finalize;
}
struct _GMenuLinkIterPrivate
{
GQuark name;
GMenuModel *value;
gboolean valid;
};
G_DEFINE_ABSTRACT_TYPE_WITH_PRIVATE (GMenuLinkIter, g_menu_link_iter, G_TYPE_OBJECT)
/**
* g_menu_link_iter_get_next:
* @iter: a #GMenuLinkIter
* @out_link: (out) (optional) (transfer none): the name of the link
* @value: (out) (optional) (transfer full): the linked #GMenuModel
*
* This function combines g_menu_link_iter_next() with
* g_menu_link_iter_get_name() and g_menu_link_iter_get_value().
*
* First the iterator is advanced to the next (possibly first) link.
* If that fails, then %FALSE is returned and there are no other effects.
*
* If successful, @out_link and @value are set to the name and #GMenuModel
* of the link that has just been advanced to. At this point,
* g_menu_link_iter_get_name() and g_menu_link_iter_get_value() will return the
* same values again.
*
* The value returned in @out_link remains valid for as long as the iterator
* remains at the current position. The value returned in @value must
* be unreffed using g_object_unref() when it is no longer in use.
*
* Returns: %TRUE on success, or %FALSE if there is no additional link
*
* Since: 2.32
*/
gboolean
g_menu_link_iter_get_next (GMenuLinkIter *iter,
const gchar **out_link,
GMenuModel **value)
{
const gchar *name;
if (iter->priv->value)
{
g_object_unref (iter->priv->value);
iter->priv->value = NULL;
}
iter->priv->valid = G_MENU_LINK_ITER_GET_CLASS (iter)
->get_next (iter, &name, &iter->priv->value);
if (iter->priv->valid)
{
g_assert (name != NULL);
iter->priv->name = g_quark_from_string (name);
if (out_link)
*out_link = g_quark_to_string (iter->priv->name);
if (value)
*value = g_object_ref (iter->priv->value);
}
return iter->priv->valid;
}
/**
* g_menu_link_iter_next:
* @iter: a #GMenuLinkIter
*
* Attempts to advance the iterator to the next (possibly first)
* link.
*
* %TRUE is returned on success, or %FALSE if there are no more links.
*
* You must call this function when you first acquire the iterator to
* advance it to the first link (and determine if the first link exists
* at all).
*
* Returns: %TRUE on success, or %FALSE when there are no more links
*
* Since: 2.32
*/
gboolean
g_menu_link_iter_next (GMenuLinkIter *iter)
{
return g_menu_link_iter_get_next (iter, NULL, NULL);
}
/**
* g_menu_link_iter_get_name:
* @iter: a #GMenuLinkIter
*
* Gets the name of the link at the current iterator position.
*
* The iterator is not advanced.
*
* Returns: the type of the link
*
* Since: 2.32
*/
const gchar *
g_menu_link_iter_get_name (GMenuLinkIter *iter)
{
g_return_val_if_fail (iter->priv->valid, 0);
return g_quark_to_string (iter->priv->name);
}
/**
* g_menu_link_iter_get_value:
* @iter: a #GMenuLinkIter
*
* Gets the linked #GMenuModel at the current iterator position.
*
* The iterator is not advanced.
*
* Returns: (transfer full): the #GMenuModel that is linked to
*
* Since: 2.32
*/
GMenuModel *
g_menu_link_iter_get_value (GMenuLinkIter *iter)
{
g_return_val_if_fail (iter->priv->valid, NULL);
return g_object_ref (iter->priv->value);
}
static void
g_menu_link_iter_finalize (GObject *object)
{
GMenuLinkIter *iter = G_MENU_LINK_ITER (object);
if (iter->priv->value)
g_object_unref (iter->priv->value);
G_OBJECT_CLASS (g_menu_link_iter_parent_class)
->finalize (object);
}
static void
g_menu_link_iter_init (GMenuLinkIter *iter)
{
iter->priv = g_menu_link_iter_get_instance_private (iter);
}
static void
g_menu_link_iter_class_init (GMenuLinkIterClass *class)
{
GObjectClass *object_class = G_OBJECT_CLASS (class);
object_class->finalize = g_menu_link_iter_finalize;
}