/*
* This program 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 of the License, or (at your option) version 3.
*
* This program 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 the program; if not, see <http://www.gnu.org/licenses/>
*
* Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "e-plugin-ui.h"
#include <string.h>
#define E_PLUGIN_UI_HOOK_GET_PRIVATE(obj) \
(G_TYPE_INSTANCE_GET_PRIVATE \
((obj), E_TYPE_PLUGIN_UI_HOOK, EPluginUIHookPrivate))
#define E_PLUGIN_UI_DEFAULT_FUNC "e_plugin_ui_init"
#define E_PLUGIN_UI_HOOK_CLASS_ID "org.gnome.evolution.ui:1.0"
struct _EPluginUIHookPrivate {
/* Table of GtkUIManager ID's to UI definitions.
*
* For example:
*
* <hook class="org.gnome.evolution.ui:1.0">
* <ui-manager id="org.gnome.evolution.foo">
* ... UI definition ...
* </ui-manager>
* </hook>
*
* Results in:
*
* g_hash_table_insert (
* ui_definitions,
* "org.gnome.evolution.foo",
* "... UI definition ...");
*
* See http://library.gnome.org/devel/gtk/unstable/GtkUIManager.html
* for more information about UI definitions. Note: the <ui> tag is
* optional.
*/
GHashTable *ui_definitions;
/* Table of GtkUIManager ID's to callback function names.
*
* This stores the optional "callback" attribute in the <ui-manager>
* element. If not specified, it defaults to "e_plugin_ui_init".
*
* This is useful when extending the UI of multiple GtkUIManager IDs
* from a single plugin.
*
* For example:
*
* <hook class="org.gnome.evolution.ui:1.0">
* <ui-manager id="org.gnome.evolution.foo" callback="init_foo">
* ...
* </ui-manager>
* <ui-manager id="org.gnome.evolution.bar" callback="init_bar">
* ...
* </ui-manager>
* </hook>
*
* Results in:
*
* g_hash_table_insert (
* callbacks, "org.gnome.evolution.foo", "init_foo");
*
* g_hash_table_insert (
* callbacks, "org.gnome.evolution.bar", "init_bar");
*/
GHashTable *callbacks;
/* The registry is the heart of EPluginUI. It tracks GtkUIManager
* instances, GtkUIManager IDs, and UI merge IDs as a hash table of
* hash tables:
*
* GtkUIManager instance -> GtkUIManager ID -> UI Merge ID
*
* A GtkUIManager instance and ID form a unique key for looking up
* UI merge IDs. The reason both are needed is because the same
* GtkUIManager instance can be registered under multiple IDs.
*
* This is done primarily to support shell views, which share a
* common GtkUIManager instance for a particular shell window.
* Each shell view registers the same GtkUIManager instance under
* a unique ID:
*
* "org.gnome.evolution.mail" }
* "org.gnome.evolution.contacts" } aliases for a common
* "org.gnome.evolution.calendar" } GtkUIManager instance
* "org.gnome.evolution.memos" }
* "org.gnome.evolution.tasks" }
*
* Note: The shell window also registers the same GtkUIManager
* instance as "org.gnome.evolution.shell".
*
* This way, plugins that extend a shell view's UI will follow the
* merging and unmerging of the shell view automatically.
*
* The presence or absence of GtkUIManager IDs in the registry is
* significant. Presence of a (instance, ID) pair indicates that
* UI manager is active, absence indicates inactive. Furthermore,
* a non-zero merge ID for an active UI manager indicates the
* plugin is enabled. Zero indicates disabled.
*
* Here's a quick scenario to illustrate:
*
* Suppose we have a plugin that extends the mail shell view UI.
* Its EPlugin definition file has this section:
*
* <hook class="org.gnome.evolution.ui:1.0">
* <ui-manager id="org.gnome.evolution.mail">
* ... UI definition ...
* </ui-manager>
* </hook>
*
* The plugin is enabled and the active shell view is "mail".
* Let "ManagerA" denote the common GtkUIManager instance for
* this shell window. Here's what happens to the registry as
* the user performs various actions;
*
* - Initial State Merge ID
* V
* { "ManagerA", { "org.gnome.evolution.mail", 3 } }
*
* - User Disables the Plugin
*
* { "ManagerA", { "org.gnome.evolution.mail", 0 } }
*
* - User Enables the Plugin
*
* { "ManagerA", { "org.gnome.evolution.mail", 4 } }
*
* - User Switches to Calendar View
*
* { "ManagerA", { } }
*
* - User Disables the Plugin
*
* { "ManagerA", { } }
*
* - User Switches to Mail View
*
* { "ManagerA", { "org.gnome.evolution.mail", 0 } }
*
* - User Enables the Plugin
*
* { "ManagerA", { "org.gnome.evolution.mail", 5 } }
*/
GHashTable *registry;
};
G_DEFINE_TYPE (
EPluginUIHook,
e_plugin_ui_hook,
E_TYPE_PLUGIN_HOOK)
static void
plugin_ui_hook_unregister_manager (EPluginUIHook *hook,
GtkUIManager *ui_manager)
{
GHashTable *registry;
/* Note: Manager may already be finalized. */
registry = hook->priv->registry;
g_hash_table_remove (registry, ui_manager);
}
static void
plugin_ui_hook_register_manager (EPluginUIHook *hook,
GtkUIManager *ui_manager,
const gchar *id,
gpointer user_data)
{
EPlugin *plugin;
EPluginUIInitFunc func;
GHashTable *registry;
GHashTable *hash_table;
const gchar *func_name;
plugin = ((EPluginHook *) hook)->plugin;
hash_table = hook->priv->callbacks;
func_name = g_hash_table_lookup (hash_table, id);
if (func_name == NULL)
func_name = E_PLUGIN_UI_DEFAULT_FUNC;
func = e_plugin_get_symbol (plugin, func_name);
if (func == NULL) {
g_critical (
"Plugin \"%s\" is missing a function named %s()",
plugin->name, func_name);
return;
}
/* Pass the manager and user_data to the plugin's callback function.
* The plugin should install whatever GtkActions and GtkActionGroups
* are neccessary to implement the actions in its UI definition. */
if (!func (ui_manager, user_data))
return;
g_object_weak_ref (
G_OBJECT (ui_manager), (GWeakNotify)
plugin_ui_hook_unregister_manager, hook);
registry = hook->priv->registry;
hash_table = g_hash_table_lookup (registry, ui_manager);
if (hash_table == NULL) {
hash_table = g_hash_table_new_full (
g_str_hash, g_str_equal,
(GDestroyNotify) g_free,
(GDestroyNotify) NULL);
g_hash_table_insert (registry, ui_manager, hash_table);
}
}
static guint
plugin_ui_hook_merge_ui (EPluginUIHook *hook,
GtkUIManager *ui_manager,
const gchar *id)
{
GHashTable *hash_table;
const gchar *ui_definition;
guint merge_id;
GError *error = NULL;
hash_table = hook->priv->ui_definitions;
ui_definition = g_hash_table_lookup (hash_table, id);
g_return_val_if_fail (ui_definition != NULL, 0);
merge_id = gtk_ui_manager_add_ui_from_string (
ui_manager, ui_definition, -1, &error);
if (error != NULL) {
g_warning ("%s", error->message);
g_error_free (error);
}
return merge_id;
}
static void
plugin_ui_enable_manager (EPluginUIHook *hook,
GtkUIManager *ui_manager,
const gchar *id)
{
GHashTable *hash_table;
GHashTable *ui_definitions;
GList *keys;
hash_table = hook->priv->registry;
hash_table = g_hash_table_lookup (hash_table, ui_manager);
if (hash_table == NULL)
return;
if (id != NULL)
keys = g_list_prepend (NULL, (gpointer) id);
else
keys = g_hash_table_get_keys (hash_table);
ui_definitions = hook->priv->ui_definitions;
while (keys != NULL) {
guint merge_id;
gpointer data;
id = keys->data;
keys = g_list_delete_link (keys, keys);
if (g_hash_table_lookup (ui_definitions, id) == NULL)
continue;
data = g_hash_table_lookup (hash_table, id);
merge_id = GPOINTER_TO_UINT (data);
if (merge_id > 0)
continue;
if (((EPluginHook *) hook)->plugin->enabled)
merge_id = plugin_ui_hook_merge_ui (
hook, ui_manager, id);
/* Merge ID will be 0 on error, which is what we want. */
data = GUINT_TO_POINTER (merge_id);
g_hash_table_insert (hash_table, g_strdup (id), data);
}
}
static void
plugin_ui_disable_manager (EPluginUIHook *hook,
GtkUIManager *ui_manager,
const gchar *id,
gboolean remove)
{
GHashTable *hash_table;
GHashTable *ui_definitions;
GList *keys;
hash_table = hook->priv->registry;
hash_table = g_hash_table_lookup (hash_table, ui_manager);
if (hash_table == NULL)
return;
if (id != NULL)
keys = g_list_prepend (NULL, (gpointer) id);
else
keys = g_hash_table_get_keys (hash_table);
ui_definitions = hook->priv->ui_definitions;
while (keys != NULL) {
guint merge_id;
gpointer data;
id = keys->data;
keys = g_list_delete_link (keys, keys);
if (g_hash_table_lookup (ui_definitions, id) == NULL)
continue;
data = g_hash_table_lookup (hash_table, id);
merge_id = GPOINTER_TO_UINT (data);
/* Merge ID could be 0 if the plugin is disabled. */
if (merge_id > 0) {
gtk_ui_manager_remove_ui (ui_manager, merge_id);
gtk_ui_manager_ensure_update (ui_manager);
}
if (remove)
g_hash_table_remove (hash_table, id);
else
g_hash_table_insert (hash_table, g_strdup (id), NULL);
}
}
static void
plugin_ui_enable_hook (EPluginUIHook *hook)
{
GHashTable *hash_table;
GHashTableIter iter;
gpointer key;
/* Enable all GtkUIManagers for this hook. */
hash_table = hook->priv->registry;
g_hash_table_iter_init (&iter, hash_table);
while (g_hash_table_iter_next (&iter, &key, NULL)) {
GtkUIManager *ui_manager = key;
plugin_ui_enable_manager (hook, ui_manager, NULL);
}
}
static void
plugin_ui_disable_hook (EPluginUIHook *hook)
{
GHashTable *hash_table;
GHashTableIter iter;
gpointer key;
/* Disable all GtkUIManagers for this hook. */
hash_table = hook->priv->registry;
g_hash_table_iter_init (&iter, hash_table);
while (g_hash_table_iter_next (&iter, &key, NULL)) {
GtkUIManager *ui_manager = key;
plugin_ui_disable_manager (hook, ui_manager, NULL, FALSE);
}
}
static void
plugin_ui_hook_finalize (GObject *object)
{
EPluginUIHookPrivate *priv;
GHashTableIter iter;
gpointer ui_manager;
priv = E_PLUGIN_UI_HOOK_GET_PRIVATE (object);
/* Remove weak reference callbacks to GtkUIManagers. */
g_hash_table_iter_init (&iter, priv->registry);
while (g_hash_table_iter_next (&iter, &ui_manager, NULL))
g_object_weak_unref (
G_OBJECT (ui_manager), (GWeakNotify)
plugin_ui_hook_unregister_manager, object);
g_hash_table_destroy (priv->ui_definitions);
g_hash_table_destroy (priv->callbacks);
g_hash_table_destroy (priv->registry);
/* Chain up to parent's dispose() method. */
G_OBJECT_CLASS (e_plugin_ui_hook_parent_class)->dispose (object);
}
static gint
plugin_ui_hook_construct (EPluginHook *hook,
EPlugin *plugin,
xmlNodePtr node)
{
EPluginUIHookPrivate *priv;
priv = E_PLUGIN_UI_HOOK_GET_PRIVATE (hook);
/* XXX The EPlugin should be a property of EPluginHookClass.
* Then it could be passed directly to g_object_new() and
* we wouldn't have to chain up here. */
/* Chain up to parent's construct() method. */
E_PLUGIN_HOOK_CLASS (e_plugin_ui_hook_parent_class)->
construct (hook, plugin, node);
for (node = xmlFirstElementChild (node); node != NULL;
node = xmlNextElementSibling (node)) {
xmlNodePtr child;
xmlBufferPtr buffer;
GString *content;
const gchar *temp;
gchar *callback;
gchar *id;
if (strcmp ((gchar *) node->name, "ui-manager") != 0)
continue;
id = e_plugin_xml_prop (node, "id");
if (id == NULL) {
g_warning ("<ui-manager> requires 'id' property");
continue;
}
callback = e_plugin_xml_prop (node, "callback");
if (callback != NULL)
g_hash_table_insert (
priv->callbacks,
g_strdup (id), callback);
content = g_string_sized_new (1024);
/* Extract the XML content below <ui-manager> */
buffer = xmlBufferCreate ();
for (child = node->children; child != NULL; child = child->next) {
xmlNodeDump (buffer, node->doc, child, 2, 1);
temp = (const gchar *) xmlBufferContent (buffer);
g_string_append (content, temp);
}
g_hash_table_insert (
priv->ui_definitions,
id, g_string_free (content, FALSE));
xmlBufferFree (buffer);
}
return 0;
}
static void
plugin_ui_hook_enable (EPluginHook *hook,
gint state)
{
if (state)
plugin_ui_enable_hook (E_PLUGIN_UI_HOOK (hook));
else
plugin_ui_disable_hook (E_PLUGIN_UI_HOOK (hook));
}
static void
e_plugin_ui_hook_class_init (EPluginUIHookClass *class)
{
GObjectClass *object_class;
EPluginHookClass *plugin_hook_class;
g_type_class_add_private (class, sizeof (EPluginUIHookPrivate));
object_class = G_OBJECT_CLASS (class);
object_class->finalize = plugin_ui_hook_finalize;
plugin_hook_class = E_PLUGIN_HOOK_CLASS (class);
plugin_hook_class->id = E_PLUGIN_UI_HOOK_CLASS_ID;
plugin_hook_class->construct = plugin_ui_hook_construct;
plugin_hook_class->enable = plugin_ui_hook_enable;
}
static void
e_plugin_ui_hook_init (EPluginUIHook *hook)
{
GHashTable *ui_definitions;
GHashTable *callbacks;
GHashTable *registry;
ui_definitions = g_hash_table_new_full (
g_str_hash, g_str_equal,
(GDestroyNotify) g_free,
(GDestroyNotify) g_free);
callbacks = g_hash_table_new_full (
g_str_hash, g_str_equal,
(GDestroyNotify) g_free,
(GDestroyNotify) g_free);
registry = g_hash_table_new_full (
g_direct_hash, g_direct_equal,
(GDestroyNotify) NULL,
(GDestroyNotify) g_hash_table_destroy);
hook->priv = E_PLUGIN_UI_HOOK_GET_PRIVATE (hook);
hook->priv->ui_definitions = ui_definitions;
hook->priv->callbacks = callbacks;
hook->priv->registry = registry;
}
void
e_plugin_ui_register_manager (GtkUIManager *ui_manager,
const gchar *id,
gpointer user_data)
{
GSList *plugin_list;
g_return_if_fail (GTK_IS_UI_MANAGER (ui_manager));
g_return_if_fail (id != NULL);
/* Loop over all installed plugins. */
plugin_list = e_plugin_list_plugins ();
while (plugin_list != NULL) {
EPlugin *plugin = plugin_list->data;
GSList *iter;
plugin_list = g_slist_remove (plugin_list, plugin);
/* Look for hooks of type EPluginUIHook. */
for (iter = plugin->hooks; iter != NULL; iter = iter->next) {
EPluginUIHook *hook = iter->data;
GHashTable *hash_table;
if (!E_IS_PLUGIN_UI_HOOK (hook))
continue;
hash_table = hook->priv->ui_definitions;
/* Check if the hook has a UI definition
* for the GtkUIManager being registered. */
if (g_hash_table_lookup (hash_table, id) == NULL)
continue;
/* Register the manager with the hook. */
plugin_ui_hook_register_manager (
hook, ui_manager, id, user_data);
}
g_object_unref (plugin);
}
}
void
e_plugin_ui_enable_manager (GtkUIManager *ui_manager,
const gchar *id)
{
GSList *plugin_list;
g_return_if_fail (GTK_IS_UI_MANAGER (ui_manager));
g_return_if_fail (id != NULL);
/* Loop over all installed plugins. */
plugin_list = e_plugin_list_plugins ();
while (plugin_list != NULL) {
EPlugin *plugin = plugin_list->data;
GSList *iter;
plugin_list = g_slist_remove (plugin_list, plugin);
/* Look for hooks of type EPluginUIHook. */
for (iter = plugin->hooks; iter != NULL; iter = iter->next) {
EPluginUIHook *hook = iter->data;
if (!E_IS_PLUGIN_UI_HOOK (hook))
continue;
plugin_ui_enable_manager (hook, ui_manager, id);
}
g_object_unref (plugin);
}
}
void
e_plugin_ui_disable_manager (GtkUIManager *ui_manager,
const gchar *id)
{
GSList *plugin_list;
g_return_if_fail (GTK_IS_UI_MANAGER (ui_manager));
g_return_if_fail (id != NULL);
/* Loop over all installed plugins. */
plugin_list = e_plugin_list_plugins ();
while (plugin_list != NULL) {
EPlugin *plugin = plugin_list->data;
GSList *iter;
plugin_list = g_slist_remove (plugin_list, plugin);
/* Look for hooks of type EPluginUIHook. */
for (iter = plugin->hooks; iter != NULL; iter = iter->next) {
EPluginUIHook *hook = iter->data;
if (!E_IS_PLUGIN_UI_HOOK (hook))
continue;
plugin_ui_disable_manager (hook, ui_manager, id, TRUE);
}
g_object_unref (plugin);
}
}
