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// -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
/**
* pluginmanager.h
*
* Copyright (C) 2004 Zack Rusin <zack@kde.org>
* Copyright (C) 2003 Martijn Klingens <klingens@kde.org>
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#ifndef KOMPOSER_PLUGINMANAGER_H
#define KOMPOSER_PLUGINMANAGER_H
#include <tqmap.h>
#include <tqobject.h>
#include <tqstring.h>
#include <tqstringlist.h>
#include <tqvaluelist.h>
class KPluginInfo;
namespace Komposer
{
class Plugin;
class PluginManager : public TQObject
{
Q_OBJECT
TQ_OBJECT
public:
PluginManager( TQObject * );
~PluginManager();
/**
* Returns a list of all available plugins for the given category.
* Currently there are two categories, "Plugins" and "Editors", but
* you can add your own categories if you want.
*
* If you pass an empty string you get the complete list of ALL plugins.
*
* You can query all information on the plugins through the @ref KPluginInfo
* interface.
*/
TQValueList<KPluginInfo*> availablePlugins( const TQString &category
= TQString() ) const;
/**
* Returns a list of all plugins that are actually loaded.
* If you omit the category you get all, otherwise it's a filtered list.
* See also @ref availablePlugins().
*/
TQMap<KPluginInfo*, Plugin*> loadedPlugins( const TQString &category
= TQString() ) const;
/**
* @brief Search by plugin name. This is the key used as X-KDE-PluginInfo-Name
* in the .desktop file, e.g. "komposer_attachment"
*
* @return The @ref Plugin object found by the search, or a null
* pointer if the plugin is not loaded.
*
* If you want to also load the plugin you can better use @ref loadPlugin,
* which returns
* the pointer to the plugin if it's already loaded.
*/
Plugin* plugin( const TQString &pluginName ) const;
/**
* @brief Return the short user-visible name of the plugin.
*
* If you want to have the internal name, use @ref pluginId() instead.
*
* @return The name of the protocol, in the user's locale.
*/
TQString pluginName( const Plugin *plugin ) const;
/**
* @brief Return the internal name of the plugin.
*
* You cannot display this name on the screen, it's used internally for
* passing around IDs. Use @ref pluginName() for a string ready for display.
*
* @return The name of the protocol, in the user's locale.
*/
TQString pluginId( const Plugin *plugin ) const;
/**
* @brief Unload the plugin specified by @p pluginName
*/
bool unloadPlugin( const TQString &pluginName );
/**
* @brief Retrieve the name of the icon for a @ref Plugin.
*
* @return An empty string if the given plugin is not loaded
* or the filename of the icon to use.
*/
TQString pluginIcon( const Plugin *plugin ) const;
/**
* Shuts down the plugin manager on Komposer shutdown, but first
* unloads all plugins asynchronously.
*
* After 3 seconds all plugins should be removed; what's still left
* by then is unloaded through a hard delete instead.
*
* Note that this call also derefs the plugin manager from the event
* loop, so do NOT call this method when not terminating Komposer!
*/
void shutdown();
/**
* Enable a plugin.
*
* This marks a plugin as enabled in the config file, so loadAll()
* can pick it up later.
*
* This method does not actually load a plugin, it only edits the
* config file.
*
* @param name is the name of the plugin as it is listed in the .desktop
* file in the X-KDE-Library field.
*
* Returns false when no appropriate plugin can be found.
*/
bool setPluginEnabled( const TQString &name, bool enabled = true );
/**
* Plugin loading mode. Used by @loadPlugin. Code that doesn't want to block
* the GUI and/or lot a lot of plugins at once should use Async loading.
* The default is sync loading.
*/
enum PluginLoadMode { LoadSync, LoadAsync };
public slots:
/**
* @brief Load a single plugin by plugin name. Returns an existing plugin
* if one is already loaded in memory.
*
* If mode is set to Async, the plugin will be queued and loaded in
* the background. This method will return a null pointer. To get
* the loaded plugin you can track the @ref pluginLoaded() signal.
*
* See also @ref plugin().
*/
Plugin* loadPlugin( const TQString &pluginId, PluginLoadMode mode = LoadSync );
/**
* @brief Loads all the enabled plugins. Also used to reread the
* config file when the configuration has changed.
*/
void loadAllPlugins();
signals:
/**
* @brief Signals a new plugin has just been loaded.
*/
void pluginLoaded( Plugin *plugin );
/**
* @brief All plugins have been loaded by the plugin manager.
*
* This signal is emitted exactly ONCE, when the plugin manager has emptied
* its plugin queue for the first time. This means that if you call an async
* loadPlugin() before loadAllPlugins() this signal is probably emitted after
* the initial call completes, unless you are quick enough to fill the queue
* before it completes, which is a dangerous race you shouldn't count upon :)
*
* The signal is delayed one event loop iteration through a singleShot timer,
* but that is not guaranteed to be enough for account instantiation. You may
* need an additional timer for it in the code if you want to programmatically
* act on it.
*
* If you use the signal for enabling/disabling GUI objects there is little
* chance a user is able to activate them in the short while that's remaining,
* the slow part of the code is over now and the remaining processing time
* is neglectable for the user.
*/
void allPluginsLoaded();
private slots:
/**
* @brief Cleans up some references if the plugin is destroyed
*/
void slotPluginDestroyed( TQObject *plugin );
/**
* shutdown() starts a timer, when it fires we force all plugins
* to be unloaded here by deref()-ing the event loop to trigger the plugin
* manager's destruction
*/
void slotShutdownTimeout();
/**
* Common entry point to deref() the KApplication. Used both by the clean
* shutdown and the timeout condition of slotShutdownTimeout()
*/
void slotShutdownDone();
/**
* Emitted by a Plugin when it's ready for unload
*/
void slotPluginReadyForUnload();
/**
* Load a plugin from our queue. Does nothing if the queue is empty.
* Schedules itself again if more plugins are pending.
*/
void slotLoadNextPlugin();
private:
/**
* @internal
*
* The internal method for loading plugins.
* Called by @ref loadPlugin directly or through the queue for async plugin
* loading.
*/
Plugin *loadPluginInternal( const TQString &pluginId );
/**
* @internal
*
* Find the KPluginInfo structure by key. Reduces some code duplication.
*
* Returns a null pointer when no plugin info is found.
*/
KPluginInfo *infoForPluginId( const TQString &pluginId ) const;
private:
class Private;
Private *d;
};
}
#endif // KOMPOSER_PLUGINMANAGER_H
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