mutter/src/compositor/meta-plugin-manager.c

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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/*
* Copyright (c) 2008 Intel Corp.
*
* Author: Tomas Frydrych <tf@linux.intel.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
#include "config.h"
#include "compositor-private.h"
#include "meta-plugin-manager.h"
#include <meta/prefs.h>
#include <meta/errors.h>
#include <meta/workspace.h>
#include "meta-module.h"
#include "window-private.h"
#include <string.h>
#include <stdlib.h>
#include <clutter/x11/clutter-x11.h>
static GSList *plugin_types;
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/*
* We have one "default plugin manager" that acts for the first screen,
* but also can be used before we open any screens, and additional
* plugin managers for each screen. (This is ugly. Probably we should
* have one plugin manager and only make the plugins per-screen.)
*/
static MetaPluginManager *default_plugin_manager;
struct MetaPluginManager
{
MetaScreen *screen;
GList /* MetaPlugin */ *plugins; /* TODO -- maybe use hash table */
};
/*
* Loads the given plugin.
*/
void
meta_plugin_manager_load (MetaPluginManager *plugin_mgr,
const gchar *plugin_name)
{
const gchar *dpath = MUTTER_PLUGIN_DIR "/";
gchar *path;
MetaModule *module;
GType plugin_type;
if (g_path_is_absolute (plugin_name))
path = g_strdup (plugin_name);
else
path = g_strconcat (dpath, plugin_name, ".so", NULL);
module = g_object_new (META_TYPE_MODULE, "path", path, NULL);
if (!module || !g_type_module_use (G_TYPE_MODULE (module)))
{
/* This is fatal under the assumption that a monitoring
* process like gnome-session will take over and handle
* our untimely exit.
*/
g_printerr ("Unable to load plugin module [%s]: %s",
path, g_module_error());
exit (1);
}
plugin_type = meta_module_get_plugin_type (module);
meta_plugin_manager_register (plugin_mgr, plugin_type);
g_type_module_unuse (G_TYPE_MODULE (module));
g_free (path);
}
/*
* Registers the given plugin type
*/
void
meta_plugin_manager_register (MetaPluginManager *plugin_mgr,
GType plugin_type)
{
MetaPlugin *plugin;
plugin_types = g_slist_prepend (plugin_types, GSIZE_TO_POINTER (plugin_type));
plugin = g_object_new (plugin_type, NULL);
plugin_mgr->plugins = g_list_prepend (plugin_mgr->plugins, plugin);
}
void
meta_plugin_manager_initialize (MetaPluginManager *plugin_mgr)
{
GList *iter;
if (!plugin_mgr->plugins)
{
/*
* If no plugins are specified, load the default plugin.
*/
meta_plugin_manager_load (plugin_mgr, "default");
}
for (iter = plugin_mgr->plugins; iter; iter = iter->next)
{
MetaPlugin *plugin = (MetaPlugin*) iter->data;
MetaPluginClass *klass = META_PLUGIN_GET_CLASS (plugin);
g_object_set (plugin,
"screen", plugin_mgr->screen,
NULL);
if (klass->start)
klass->start (plugin);
}
}
static MetaPluginManager *
meta_plugin_manager_new (MetaScreen *screen)
{
MetaPluginManager *plugin_mgr;
plugin_mgr = g_new0 (MetaPluginManager, 1);
plugin_mgr->screen = screen;
if (screen)
g_object_set_data (G_OBJECT (screen), "meta-plugin-manager", plugin_mgr);
return plugin_mgr;
}
MetaPluginManager *
meta_plugin_manager_get_default (void)
{
if (!default_plugin_manager)
{
default_plugin_manager = meta_plugin_manager_new (NULL);
}
return default_plugin_manager;
}
MetaPluginManager *
meta_plugin_manager_get (MetaScreen *screen)
{
MetaPluginManager *plugin_mgr;
plugin_mgr = g_object_get_data (G_OBJECT (screen), "meta-plugin-manager");
if (plugin_mgr)
return plugin_mgr;
if (!default_plugin_manager)
meta_plugin_manager_get_default ();
if (!default_plugin_manager->screen)
{
/* The default plugin manager is so far unused, we can recycle it */
default_plugin_manager->screen = screen;
g_object_set_data (G_OBJECT (screen), "meta-plugin-manager", default_plugin_manager);
return default_plugin_manager;
}
else
{
GSList *iter;
GType plugin_type;
MetaPlugin *plugin;
plugin_mgr = meta_plugin_manager_new (screen);
for (iter = plugin_types; iter; iter = iter->next)
{
plugin_type = (GType)GPOINTER_TO_SIZE (iter->data);
plugin = g_object_new (plugin_type, "screen", screen, NULL);
plugin_mgr->plugins = g_list_prepend (plugin_mgr->plugins, plugin);
}
return plugin_mgr;
}
}
static void
meta_plugin_manager_kill_window_effects (MetaPluginManager *plugin_mgr,
MetaWindowActor *actor)
{
GList *l = plugin_mgr->plugins;
while (l)
{
MetaPlugin *plugin = l->data;
MetaPluginClass *klass = META_PLUGIN_GET_CLASS (plugin);
if (klass->kill_window_effects)
klass->kill_window_effects (plugin, actor);
l = l->next;
}
}
static void
meta_plugin_manager_kill_switch_workspace (MetaPluginManager *plugin_mgr)
{
GList *l = plugin_mgr->plugins;
while (l)
{
MetaPlugin *plugin = l->data;
MetaPluginClass *klass = META_PLUGIN_GET_CLASS (plugin);
if (klass->kill_switch_workspace)
klass->kill_switch_workspace (plugin);
l = l->next;
}
}
/*
* Public method that the compositor hooks into for events that require
* no additional parameters.
*
* Returns TRUE if at least one of the plugins handled the event type (i.e.,
* if the return value is FALSE, there will be no subsequent call to the
* manager completed() callback, and the compositor must ensure that any
* appropriate post-effect cleanup is carried out.
*/
gboolean
meta_plugin_manager_event_simple (MetaPluginManager *plugin_mgr,
MetaWindowActor *actor,
unsigned long event)
{
GList *l = plugin_mgr->plugins;
gboolean retval = FALSE;
MetaDisplay *display = meta_screen_get_display (plugin_mgr->screen);
if (display->display_opening)
return FALSE;
while (l)
{
MetaPlugin *plugin = l->data;
MetaPluginClass *klass = META_PLUGIN_GET_CLASS (plugin);
switch (event)
{
case META_PLUGIN_MINIMIZE:
if (klass->minimize)
{
retval = TRUE;
meta_plugin_manager_kill_window_effects (plugin_mgr,
actor);
_meta_plugin_effect_started (plugin);
klass->minimize (plugin, actor);
}
break;
case META_PLUGIN_MAP:
if (klass->map)
{
retval = TRUE;
meta_plugin_manager_kill_window_effects (plugin_mgr,
actor);
_meta_plugin_effect_started (plugin);
klass->map (plugin, actor);
}
break;
case META_PLUGIN_DESTROY:
if (klass->destroy)
{
retval = TRUE;
_meta_plugin_effect_started (plugin);
klass->destroy (plugin, actor);
}
break;
default:
g_warning ("Incorrect handler called for event %lu", event);
}
l = l->next;
}
return retval;
}
/*
* The public method that the compositor hooks into for maximize and unmaximize
* events.
*
* Returns TRUE if at least one of the plugins handled the event type (i.e.,
* if the return value is FALSE, there will be no subsequent call to the
* manager completed() callback, and the compositor must ensure that any
* appropriate post-effect cleanup is carried out.
*/
gboolean
meta_plugin_manager_event_maximize (MetaPluginManager *plugin_mgr,
MetaWindowActor *actor,
unsigned long event,
gint target_x,
gint target_y,
gint target_width,
gint target_height)
{
GList *l = plugin_mgr->plugins;
gboolean retval = FALSE;
MetaDisplay *display = meta_screen_get_display (plugin_mgr->screen);
if (display->display_opening)
return FALSE;
while (l)
{
MetaPlugin *plugin = l->data;
MetaPluginClass *klass = META_PLUGIN_GET_CLASS (plugin);
switch (event)
{
case META_PLUGIN_MAXIMIZE:
if (klass->maximize)
{
retval = TRUE;
meta_plugin_manager_kill_window_effects (plugin_mgr,
actor);
_meta_plugin_effect_started (plugin);
klass->maximize (plugin, actor,
target_x, target_y,
target_width, target_height);
}
break;
case META_PLUGIN_UNMAXIMIZE:
if (klass->unmaximize)
{
retval = TRUE;
meta_plugin_manager_kill_window_effects (plugin_mgr,
actor);
_meta_plugin_effect_started (plugin);
klass->unmaximize (plugin, actor,
target_x, target_y,
target_width, target_height);
}
break;
default:
g_warning ("Incorrect handler called for event %lu", event);
}
l = l->next;
}
return retval;
}
/*
* The public method that the compositor hooks into for desktop switching.
*
* Returns TRUE if at least one of the plugins handled the event type (i.e.,
* if the return value is FALSE, there will be no subsequent call to the
* manager completed() callback, and the compositor must ensure that any
* appropriate post-effect cleanup is carried out.
*/
gboolean
meta_plugin_manager_switch_workspace (MetaPluginManager *plugin_mgr,
gint from,
gint to,
MetaMotionDirection direction)
{
GList *l = plugin_mgr->plugins;
gboolean retval = FALSE;
MetaDisplay *display = meta_screen_get_display (plugin_mgr->screen);
if (display->display_opening)
return FALSE;
while (l)
{
MetaPlugin *plugin = l->data;
MetaPluginClass *klass = META_PLUGIN_GET_CLASS (plugin);
if (klass->switch_workspace)
{
retval = TRUE;
meta_plugin_manager_kill_switch_workspace (plugin_mgr);
_meta_plugin_effect_started (plugin);
klass->switch_workspace (plugin, from, to, direction);
}
l = l->next;
}
return retval;
}
/*
* The public method that the compositor hooks into for desktop switching.
*
* Returns TRUE if at least one of the plugins handled the event type (i.e.,
* if the return value is FALSE, there will be no subsequent call to the
* manager completed() callback, and the compositor must ensure that any
* appropriate post-effect cleanup is carried out.
*/
gboolean
meta_plugin_manager_xevent_filter (MetaPluginManager *plugin_mgr,
XEvent *xev)
{
GList *l;
gboolean have_plugin_xevent_func;
if (!plugin_mgr)
return FALSE;
l = plugin_mgr->plugins;
/* We need to make sure that clutter gets certain events, like
* ConfigureNotify on the stage window. If there is a plugin that
* provides an xevent_filter function, then it's the responsibility
* of that plugin to pass events to Clutter. Otherwise, we send the
* event directly to Clutter ourselves.
*
* What happens if there are two plugins with xevent_filter functions
* is undefined; in general, multiple competing plugins are something
* we don't support well or care much about.
*
* FIXME: Really, we should just always handle sending the event to
* clutter if a plugin doesn't report the event as handled by
* returning TRUE, but it doesn't seem worth breaking compatibility
* of the plugin interface right now to achieve this; the way it is
* now works fine in practice.
*/
have_plugin_xevent_func = FALSE;
while (l)
{
MetaPlugin *plugin = l->data;
MetaPluginClass *klass = META_PLUGIN_GET_CLASS (plugin);
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if (klass->xevent_filter)
{
have_plugin_xevent_func = TRUE;
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if (klass->xevent_filter (plugin, xev) == TRUE)
return TRUE;
}
l = l->next;
}
if (!have_plugin_xevent_func)
return clutter_x11_handle_event (xev) != CLUTTER_X11_FILTER_CONTINUE;
return FALSE;
}