forked from openlp/openlp
291 lines
9.0 KiB
Python
291 lines
9.0 KiB
Python
# -*- coding: utf-8 -*-
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# vim: autoindent shiftwidth=4 expandtab textwidth=80 tabstop=4 softtabstop=4
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###############################################################################
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# OpenLP - Open Source Lyrics Projection #
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# --------------------------------------------------------------------------- #
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# Copyright (c) 2008-2010 Raoul Snyman #
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# Portions copyright (c) 2008-2010 Tim Bentley, Jonathan Corwin, Michael #
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# Gorven, Scott Guerrieri, Christian Richter, Maikel Stuivenberg, Martin #
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# Thompson, Jon Tibble, Carsten Tinggaard #
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# --------------------------------------------------------------------------- #
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# This program is free software; you can redistribute it and/or modify it #
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# under the terms of the GNU General Public License as published by the Free #
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# Software Foundation; version 2 of the License. #
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# #
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# This program is distributed in the hope that it will be useful, but WITHOUT #
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or #
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# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for #
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# more details. #
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# #
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# You should have received a copy of the GNU General Public License along #
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# with this program; if not, write to the Free Software Foundation, Inc., 59 #
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# Temple Place, Suite 330, Boston, MA 02111-1307 USA #
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###############################################################################
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"""
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Provide the generic plugin functionality for OpenLP plugins.
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"""
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import logging
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from PyQt4 import QtCore
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from openlp.core.lib import Receiver
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log = logging.getLogger(__name__)
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class PluginStatus(object):
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"""
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Defines the status of the plugin
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"""
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Active = 1
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Inactive = 0
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Disabled = -1
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class Plugin(QtCore.QObject):
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"""
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Base class for openlp plugins to inherit from.
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**Basic Attributes**
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``name``
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The name that should appear in the plugins list.
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``version``
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The version number of this iteration of the plugin.
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``settingsSection``
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The namespace to store settings for the plugin.
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``icon``
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An instance of QIcon, which holds an icon for this plugin.
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``log``
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A log object used to log debugging messages. This is pre-instantiated.
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``weight``
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A numerical value used to order the plugins.
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**Hook Functions**
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``checkPreConditions()``
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Provides the Plugin with a handle to check if it can be loaded.
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``getMediaManagerItem()``
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Returns an instance of MediaManagerItem to be used in the Media Manager.
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``addImportMenuItem(import_menu)``
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Add an item to the Import menu.
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``addExportMenuItem(export_menu)``
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Add an item to the Export menu.
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``getSettingsTab()``
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Returns an instance of SettingsTabItem to be used in the Settings
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dialog.
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``addToMenu(menubar)``
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A method to add a menu item to anywhere in the menu, given the menu bar.
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``handle_event(event)``
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A method use to handle events, given an Event object.
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``about()``
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Used in the plugin manager, when a person clicks on the 'About' button.
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"""
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log.info(u'loaded')
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def __init__(self, name, version=None, plugin_helpers=None):
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"""
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This is the constructor for the plugin object. This provides an easy
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way for descendent plugins to populate common data. This method *must*
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be overridden, like so::
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class MyPlugin(Plugin):
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def __init__(self):
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Plugin.__init(self, u'MyPlugin', u'0.1')
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``name``
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Defaults to *None*. The name of the plugin.
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``version``
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Defaults to *None*. The version of the plugin.
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``plugin_helpers``
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Defaults to *None*. A list of helper objects.
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"""
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QtCore.QObject.__init__(self)
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self.name = name
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if version:
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self.version = version
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self.settingsSection = self.name.lower()
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self.icon = None
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self.weight = 0
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self.status = PluginStatus.Inactive
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# Set up logging
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self.log = logging.getLogger(self.name)
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self.previewController = plugin_helpers[u'preview']
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self.liveController = plugin_helpers[u'live']
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self.renderManager = plugin_helpers[u'render']
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self.serviceManager = plugin_helpers[u'service']
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self.settingsForm = plugin_helpers[u'settings form']
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self.mediadock = plugin_helpers[u'toolbox']
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self.displayManager = plugin_helpers[u'displaymanager']
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self.pluginManager = plugin_helpers[u'pluginmanager']
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QtCore.QObject.connect(Receiver.get_receiver(),
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QtCore.SIGNAL(u'%s_add_service_item' % self.name),
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self.processAddServiceEvent)
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def checkPreConditions(self):
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"""
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Provides the Plugin with a handle to check if it can be loaded.
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Failing Preconditions does not stop a settings Tab being created
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Returns True or False.
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"""
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return True
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def setStatus(self):
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"""
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Sets the status of the plugin
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"""
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self.status = QtCore.QSettings().value(
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self.settingsSection + u'/status',
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QtCore.QVariant(PluginStatus.Inactive)).toInt()[0]
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def toggleStatus(self, new_status):
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"""
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Changes the status of the plugin and remembers it
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"""
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self.status = new_status
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QtCore.QSettings().setValue(
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self.settingsSection + u'/status', QtCore.QVariant(self.status))
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def isActive(self):
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"""
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Indicates if the plugin is active
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Returns True or False.
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"""
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return self.status == PluginStatus.Active
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def getMediaManagerItem(self):
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"""
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Construct a MediaManagerItem object with all the buttons and things
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you need, and return it for integration into openlp.org.
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"""
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pass
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def addImportMenuItem(self, importMenu):
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"""
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Create a menu item and add it to the "Import" menu.
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``importMenu``
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The Import menu.
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"""
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pass
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def addExportMenuItem(self, exportMenu):
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"""
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Create a menu item and add it to the "Export" menu.
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``exportMenu``
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The Export menu
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"""
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pass
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def addToolsMenuItem(self, toolsMenu):
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"""
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Create a menu item and add it to the "Tools" menu.
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``toolsMenu``
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The Tools menu
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"""
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pass
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def getSettingsTab(self):
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"""
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Create a tab for the settings window.
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"""
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pass
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def addToMenu(self, menubar):
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"""
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Add menu items to the menu, given the menubar.
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``menubar``
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The application's menu bar.
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"""
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pass
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def processAddServiceEvent(self, replace=False):
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"""
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Generic Drag and drop handler triggered from service_manager.
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"""
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log.debug(u'processAddServiceEvent event called for plugin %s' %
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self.name)
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if replace:
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self.mediaItem.onAddEditClick()
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else:
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self.mediaItem.onAddClick()
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def about(self):
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"""
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Show a dialog when the user clicks on the 'About' button in the plugin
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manager.
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"""
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raise NotImplementedError(
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u'Plugin.about needs to be defined by the plugin')
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def initialise(self):
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"""
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Called by the plugin Manager to initialise anything it needs.
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"""
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if self.mediaItem:
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self.mediaItem.initialise()
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self.insertToolboxItem()
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def finalise(self):
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"""
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Called by the plugin Manager to cleanup things.
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"""
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self.removeToolboxItem()
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def removeToolboxItem(self):
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"""
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Called by the plugin to remove toolbar
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"""
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if self.mediaItem:
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self.mediadock.remove_dock(self.name)
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if self.settings_tab:
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self.settingsForm.removeTab(self.name)
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def insertToolboxItem(self):
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"""
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Called by plugin to replace toolbar
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"""
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if self.mediaItem:
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self.mediadock.insert_dock(self.mediaItem, self.icon, self.weight)
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if self.settings_tab:
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self.settingsForm.insertTab(self.settings_tab, self.weight)
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def usesTheme(self, theme):
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"""
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Called to find out if a plugin is currently using a theme.
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Returns True if the theme is being used, otherwise returns False.
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"""
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return False
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def renameTheme(self, oldTheme, newTheme):
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"""
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Renames a theme a plugin is using making the plugin use the new name.
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``oldTheme``
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The name of the theme the plugin should stop using.
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``newTheme``
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The new name the plugin should now use.
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"""
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pass
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