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83d14e1c1c
It is split into - /libgnucash (for the non-gui bits) - /gnucash (for the gui) - /common (misc source files used by both) - /bindings (currently only holds python bindings) This is the first step in restructuring the code. It will need much more fine tuning later on.
337 lines
12 KiB
C
337 lines
12 KiB
C
/********************************************************************\
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* gnc-component-manager.h - GUI component manager interface *
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* Copyright (C) 2000 Dave Peticolas <dave@krondo.com> *
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* *
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* This program is free software; you can redistribute it and/or *
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* modify it under the terms of the GNU General Public License as *
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* published by the Free Software Foundation; either version 2 of *
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* the License, or (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License*
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* along with this program; if not, write to the Free Software *
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. *
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\********************************************************************/
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#ifndef GNC_COMPONENT_MANAGER_H
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#define GNC_COMPONENT_MANAGER_H
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#include <glib.h>
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#include "qof.h"
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#define NO_COMPONENT (-1)
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typedef struct
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{
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QofEventId event_mask;
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} EventInfo;
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/* GNCComponentRefreshHandler
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* Handler invoked to inform the component that a refresh
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* may be needed.
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*
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* changes: if NULL, the component should perform a refresh.
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*
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* if non-NULL, changes is a GncGUID hash that maps
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* GUIDs to EventInfo structs describing which
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* events have been received. Entities not in
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* the hash have not generated any events.
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* Entities which have been destroyed will be in
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* the hash, but may not exist anymore.
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*
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* Note since refreshes may not occur with every change,
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* an entity may have all three change values.
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*
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* The component should use 'changes' to determine whether
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* or not a refresh is needed. The hash table must not be
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* changed.
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*
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* Notes on refreshing: when the handler is invoked any engine
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* entities used by the component may have
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* already been deleted. 'Refreshing' the
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* component may require closing the component.
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*
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* Notes on dealing with destroyed entities: As stated above, entities
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* in the changes GHashTable may no longer exist. So how can you
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* determine if this has happened? Well, it's a good idea to check
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* for the QOF_EVENT_DESTROY bit in the EventInfo structure. Of
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* course, that means you need the hash key (GncGUID) for the destroyed
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* entity. How are you going to get the GncGUID from the entity if the
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* entity has already been destroyed? You're not. So, you have to
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* save a COPY of the key (GncGUID) away beforehand.
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*
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* user_data: user_data supplied when component was registered.
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*/
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typedef void (*GNCComponentRefreshHandler) (GHashTable *changes,
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gpointer user_data);
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/* GNCComponentCloseHandler
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* Handler invoked to close the component.
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*
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* user_data: user_data supplied when component was registered.
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*
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* Notes on closing: components are not automatically unregistered
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* when the close handler is invoked. Components
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* may not ignore the handler.
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*/
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typedef void (*GNCComponentCloseHandler) (gpointer user_data);
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/* GNCComponentFindHandler
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* Handler invoked when searching for a component.
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*
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* find_data: find_data supplied when search was started.
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* user_data: user_data supplied when component was registered.
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*
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* Return: TRUE if the component matches the search criteria.
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*/
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typedef gboolean (*GNCComponentFindHandler) (gpointer find_data,
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gpointer user_data);
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/* GNCComponentHandler
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* Generic handler used in iterating over components.
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*
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* component_class: class of component
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* component_id: id of component
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* iter_data: user_data supplied by caller
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*
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* Return: TRUE if the callback did something
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*/
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typedef gboolean (*GNCComponentHandler) (const char *component_class,
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gint component_id,
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gpointer user_data,
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gpointer iter_data);
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/* gnc_component_manager_init
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* Initialize the component manager.
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*/
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void gnc_component_manager_init (void);
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/* gnc_component_manager_shutdown
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* Shutdown the component manager.
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*/
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void gnc_component_manager_shutdown (void);
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/* gnc_register_gui_component
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* Register a GUI component with the manager.
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*
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* component_class: a string defining a class of components
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* certain component functions can be performed
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* on all components in a class. For that reason,
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* components in the same class should all use
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* the same type for user_data.
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*
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* refresh_cb: refresh handler, may be NULL
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* close_cb: close handler, may be NULL
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* user_data: user_data argument for handlers
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*
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*
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* Notes: After a refresh handler is registered, the
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* component must use the API calls below to
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* inform the component manager which engine
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* entities are being 'watched', i.e., which
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* engine entities may cause the component
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* to need refreshing.
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*
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* When a component is first registered, it
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* is not watching anything, and thus will
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* not receive refresh events.
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*
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* Return: id of component, or NO_COMPONENT, if error
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*/
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gint gnc_register_gui_component (const char *component_class,
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GNCComponentRefreshHandler refresh_handler,
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GNCComponentCloseHandler close_handler,
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gpointer user_data);
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/* gnc_gui_component_set_session
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* Set the associated session of this component
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*
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* component_id: id of component which is watching the entity
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* session: the session this component is associated with
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*/
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void gnc_gui_component_set_session (gint component_id, gpointer session);
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/* gnc_gui_component_watch_entity
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* Add an entity to the list of those being watched by the component.
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* Only entities with refresh handlers should add watches.
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*
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* component_id: id of component which is watching the entity
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* entity: id of entity to watch
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* event_mask: mask which determines which kinds of events are watched
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* setting the mask to 0 turns off watching for the entity.
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*/
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void gnc_gui_component_watch_entity (gint component_id,
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const GncGUID *entity,
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QofEventId event_mask);
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/* gnc_gui_component_watch_entity_type
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* Watch all entities of a particular type.
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*
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* component_id: id of component which is watching the entity type
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* entity_type: type of entity to watch, either GNC_ID_TRANS or
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* GNC_ID_ACCOUNT
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* event_mask: mask which determines which kinds of events are watched
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* setting the mask to 0 turns off watching for the entity type
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*/
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void gnc_gui_component_watch_entity_type (gint component_id,
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QofIdTypeConst entity_type,
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QofEventId event_mask);
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/* gnc_gui_get_entity_events
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* Return the event info of the events which have been generated by
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* the given entity.
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*
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* changes: a hash of changes as in the refresh handler
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* entity: the GncGUID of the entity to get the event mask for
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*
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* Returns: the event info of the entity, or NULL
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* if it is not found.
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*/
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const EventInfo * gnc_gui_get_entity_events (GHashTable *changes,
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const GncGUID *entity);
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/* gnc_gui_component_clear_watches
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* Clear all watches for the component.
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*
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* component_id: id of component to clear watches for.
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*/
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void gnc_gui_component_clear_watches (gint component_id);
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/* gnc_unregister_gui_component
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* Unregister a gui component from the manager.
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*
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* component_id: id of component to unregister
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*/
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void gnc_unregister_gui_component (gint component_id);
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/* gnc_unregister_gui_component_by_data
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* Unregister a gui component using the user_data pointer.
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*
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* component_class: class component is in
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* user_data: user_data pointer of component to unregister
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* all components with that user_data in the
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* class are unregistered.
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*/
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void gnc_unregister_gui_component_by_data (const char *component_class,
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gpointer user_data);
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/* gnc_suspend_gui_refresh
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* Suspend refresh handlers by the component manager.
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* This routine may be called multiple times. Each call
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* increases the suspend counter (starts at zero).
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*/
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void gnc_suspend_gui_refresh (void);
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/* gnc_resume_gui_refresh
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* Resume refresh handlers by the component manager.
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* Each call reduces the suspend counter by one. When
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* the counter reaches zero, all changes which have
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* occurred since the last refresh are collected and
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* passed to the components in refresh handlers.
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*/
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void gnc_resume_gui_refresh (void);
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/* gnc_gui_refresh_all
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* Force all components to refresh.
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*
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* This routine may only be invoked when the suspend counter
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* is zero. It should never be mixed with the suspend/resume
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* refresh routines.
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*/
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void gnc_gui_refresh_all (void);
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/* gnc_gui_refresh_suspended
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* Return TRUE if gui refreshes are suspended.
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*/
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gboolean gnc_gui_refresh_suspended (void);
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/* gnc_close_gui_component
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* Invoke the close handler for the indicated component.
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*
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* component_id: id of component to close
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*/
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void gnc_close_gui_component (gint component_id);
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/* gnc_close_gui_component_by_data
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* Invoke the close handler for components in the given
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* class with the given user_data.
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*
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* component_class: class to close components in
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* user_data: user_data of component to close
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* all components with that user_data
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* are closed.
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*/
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void gnc_close_gui_component_by_data (const char *component_class,
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gpointer user_data);
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/* gnc_close_gui_component_by_session
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* Invoke the close handler for components with the given session
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*
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* session: session to close
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* all components with that session
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* are closed.
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*/
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void gnc_close_gui_component_by_session (gpointer session);
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/* gnc_find_gui_components
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* Search for components in the specified class.
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*
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* component_class: the class to search for components in
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* must be non-NULL
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* find_cb: the handler used to search for the component
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* if NULL, all components in class are returned
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* find_data: find_data passed to find_cb
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*
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* Returns: GList of user_data of found components, or NULL if none found
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* The list should be freed with g_list_free().
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*
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* Notes on finding: components should not be registered or unregistered
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* by the find callback.
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*/
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GList * gnc_find_gui_components (const char *component_class,
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GNCComponentFindHandler find_handler,
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gpointer find_data);
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/* gnc_find_first_gui_component
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* Search for the first matching component in the specified class.
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*
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* component_class: the class to search for components in
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* must be non-NULL
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* find_cb: the handler used to search for the component
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* must be non-null
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* find_data: find_data passed to find_cb
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*
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* Returns: user_data of first found component, or NULL if none found
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*
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* Notes on finding: components should not be registered or unregistered
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* by the find callback.
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*/
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gpointer gnc_find_first_gui_component (const char *component_class,
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GNCComponentFindHandler find_handler,
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gpointer find_data);
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/* gnc_forall_gui_components
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* Invoke 'handler' for components in the database.
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*
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* component_class: class to iterate over, if NULL then
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* all classes are iterated over
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* handler: handler to invoke
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* iter_data: data passed to handler
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*
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* Notes on forall: components may be unregistered by the handler,
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* but no components should be registered.
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*/
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gint gnc_forall_gui_components (const char *component_class,
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GNCComponentHandler handler,
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gpointer iter_data);
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#endif
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