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/* Copyright (C) 2012 The giomm Development Team
*
* 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, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <glibmm/object.h>
_DEFS(giomm,gio)
_PINCLUDE(glibmm/private/object_p.h)
namespace Gio
{
enum MenuAttribute
{
/// The "action" menu attribute.
MENU_ATTRIBUTE_ACTION,
/// The "label" menu attribute.
MENU_ATTRIBUTE_LABEL,
/// The "target" menu attribute.
MENU_ATTRIBUTE_TARGET
};
enum MenuLink
{
/// The "section" menu link.
MENU_LINK_SECTION,
/// The "submenu" menu link.
MENU_LINK_SUBMENU
};
class MenuAttributeIter;
class MenuLinkIter;
/** MenuModel - An abstract class representing the contents of a menu.
* MenuModel 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 MenuModel is hierarchical: sections and
* submenus are again represented by MenuModels. Menus themselves do not define
* their own roles. Rather, the role of a particular MenuModel 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).
*
* 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
* Gio::DBus::Connection::export_action_group() and the
* Gio::DBus::Connection::export_menu_model() do for ActionGroup and MenuModel.
* The client-side counterparts to make use of the exported information are
* Gio::DBus::ActionGroup and Gio::DBus::MenuModel.
*
* The API of MenuModel is very generic, with iterators for the attributes and
* links of an item, see iterate_item_attributes() and iterate_item_links().
* The 'standard' attributes and link types have predefined names:
* Gio::MENU_ATTRIBUTE_LABEL, Gio::MENU_ATTRIBUTE_ACTION,
* Gio::MENU_ATTRIBUTE_TARGET, Gio::MENU_LINK_SECTION and
* Gio::MENU_LINK_SUBMENU.
*
* Items in a MenuModel 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
* Gio::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 Gtk::Application, 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
*
* <b>Stateless.</b> A stateless action typically corresponds to an ordinary
* menu item. Selecting such a menu item will activate the action (with no
* parameter).
*
* <b>Boolean State.</b> 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.
*
* <b>String Parameter and State.</b> 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.
*
* See the C API docs for a graphical example.
* @newin{2,32}
*/
class MenuModel : public Glib::Object
{
_CLASS_GOBJECT(MenuModel, GMenuModel, G_MENU_MODEL, Glib::Object, GObject)
protected:
_CTOR_DEFAULT
public:
#m4begin
dnl See the .ccg implementation for how this conversion works.
//TODO: When we can break ABI, remove the method overload and just make it const.
//It makes no sense to return const by value.
_CONVERSION(`MenuAttribute',`const gchar*',`giomm_get_menu_attribute($3)')
#m4end
//TODO: Add a get_item_attribute() templated method to get values directly
//instead of returning a Glib::VariantBase?
_WRAP_METHOD(Glib::VariantBase get_item_attribute(int item_index, MenuAttribute attribute, const Glib::VariantType& expected_type), g_menu_model_get_item_attribute_value)
_WRAP_METHOD(const Glib::VariantBase get_item_attribute(int item_index, MenuAttribute attribute, const Glib::VariantType& expected_type) const, g_menu_model_get_item_attribute_value, constversion)
// Ignore varargs function
_IGNORE(g_menu_model_get_item_attribute)
#m4begin
dnl See the .ccg implementation for how this conversion works.
_CONVERSION(`MenuLink',`const gchar*',`giomm_get_menu_link($3)')
#m4end
_WRAP_METHOD(Glib::RefPtr<MenuModel> get_item_link(int item_index, MenuLink link), g_menu_model_get_item_link)
_WRAP_METHOD(Glib::RefPtr<const MenuModel> get_item_link(int item_index, MenuLink link) const, g_menu_model_get_item_link, constversion)
_WRAP_METHOD(bool is_mutable() const, g_menu_model_is_mutable)
_WRAP_METHOD(int get_n_items() const, g_menu_model_get_n_items)
_WRAP_METHOD(Glib::RefPtr<MenuAttributeIter> iterate_item_attributes(int item_index), g_menu_model_iterate_item_attributes)
_WRAP_METHOD(Glib::RefPtr<const MenuAttributeIter> iterate_item_attributes(int item_index) const, g_menu_model_iterate_item_attributes, constversion)
_WRAP_METHOD(Glib::RefPtr<MenuLinkIter> iterate_item_links(int item_index), g_menu_model_iterate_item_links)
_WRAP_METHOD(Glib::RefPtr<const MenuLinkIter> iterate_item_links(int item_index) const, g_menu_model_iterate_item_links, constversion)
_WRAP_METHOD(void items_changed(int position, int removed, int added), g_menu_model_items_changed)
// The items-changed signal can't have a default handler in glibmm, because it does not have one in glib.
_WRAP_SIGNAL(void items_changed(int position, int removed, int added), "items-changed", no_default_handler)
};
} // namespace Gio
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