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openlp/openlp/core/lib/eventreceiver.py

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# -*- coding: utf-8 -*-
# vim: autoindent shiftwidth=4 expandtab textwidth=80 tabstop=4 softtabstop=4
###############################################################################
# OpenLP - Open Source Lyrics Projection #
# --------------------------------------------------------------------------- #
# Copyright (c) 2008-2014 Raoul Snyman #
# Portions copyright (c) 2008-2014 Tim Bentley, Gerald Britton, Jonathan #
# Corwin, Samuel Findlay, Michael Gorven, Scott Guerrieri, Matthias Hub, #
# Meinert Jordan, Armin Köhler, Erik Lundin, Edwin Lunando, Brian T. Meyer. #
# Joshua Miller, Stevan Pettit, Andreas Preikschat, Mattias Põldaru, #
# Christian Richter, Philip Ridout, Simon Scudder, Jeffrey Smith, #
# Maikel Stuivenberg, Martin Thompson, Jon Tibble, Dave Warnock, #
# Frode Woldsund, Martin Zibricky #
# --------------------------------------------------------------------------- #
# 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; version 2 of the License. #
# #
# 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 #
###############################################################################
"""
Provide event handling code for OpenLP
"""
import logging
from PyQt4 import QtCore
log = logging.getLogger(__name__)
class EventReceiver(QtCore.QObject):
"""
Class to allow events to be passed from different parts of the system. This
is a private class and should not be used directly but rather via the
Receiver class.
**Mainwindow related and generic signals**
``mainwindow_status_text``
Changes the bottom status bar text on the mainwindow.
``openlp_warning_message``
Displays a standalone Warning Message.
``openlp_error_message``
Displays a standalone Error Message.
``openlp_information_message``
Displays a standalone Information Message.
``cursor_busy``
Makes the cursor got to a busy form.
``cursor_normal``
Resets the cursor to default.
``openlp_process_events``
Requests the Application to flush the events queue.
``openlp_version_check``
Version has changed so pop up window.
``openlp_stop_wizard``
Stops a wizard before completion.
**Setting related signals**
``config_updated``
Informs components that the config has changed.
``config_screen_changed``
The display monitor has been changed.
**Slidecontroller signals**
``slidecontroller_{live|preview}_next``
Moves to the next slide.
``slidecontroller_{live|preview}_next_noloop``
Moves to the next slide without auto advance.
``slidecontroller_{live|preview}_previous``
Moves to the previous slide.
``slidecontroller_{live|preview}_previous_noloop``
Moves to the previous slide, without auto advance.
``slidecontroller_{live|preview}_set``
Moves to a specific slide, by index.
``slidecontroller_{live|preview}_started``
Broadcasts that an item has been made live/previewed.
``slidecontroller_{live|preview}_change``
Informs the slidecontroller that a slide change has occurred and to
update itself.
``slidecontroller_{live|preview}_changed``
Broadcasts that the slidecontroller has changed the current slide.
``slidecontroller_{live|preview}_blank``
Request that the output screen is blanked.
``slidecontroller_{live|preview}_unblank``
Request that the output screen is unblanked.
``slidecontroller_live_spin_delay``
Pushes out the loop delay.
``slidecontroller_update_slide_limits``
Updates the slide_limits variable from the saved settings.
``slidecontroller_live_stop_loop``
Stop the loop on the main display.
**Servicemanager related signals**
``servicemanager_new_service``
A new service is being loaded or created.
``servicemanager_previous_item``
Display the previous item in the service.
``servicemanager_preview_live``
Requests a Preview item from the Service Manager to update live and add
a new item to the preview panel.
``servicemanager_next_item``
Display the next item in the service.
``servicemanager_set_item``
Go live on a specific item, by index.
``service_item_update``
Passes back to the service manager the service item after it has been
processed by the plugin.
**Display signals**
``update_display_css``
CSS has been updated which needs to be changed on the main display.
**Live Display signals**
``live_display_hide``
Hide the live display.
``live_display_show``
Return the live display.
``live_display_active``
The live display has been made active.
``live_display_blank_check``
Check to see if the blank display message is required.
**Theme related singlas**
``theme_update_list``
send out message with new themes.
``theme_update_global``
Tell the components we have a new global theme.
**Plugin specific signals**
``{plugin}_start``
Requests a plugin to start a external program. Path and file have to
be provided in the message.
``{plugin}_first``
Requests a plugin to handle a first event.
``{plugin}_previous``
Requests a plugin to handle a previous event.
``{plugin}_next``
Requests a plugin to handle a next event.
``{plugin}_last``
Requests a plugin to handle a last event.
``{plugin}_slide``
Requests a plugin to handle a go to specific slide event.
``{plugin}_stop``
Requests a plugin to handle a stop event.
``{plugin}_blank``
Requests a plugin to handle a blank screen event.
``{plugin}_unblank``
Requests a plugin to handle an unblank screen event.
``{plugin}_edit``
Requests a plugin edit a database item with the key as the payload.
``{plugin}_edit_clear``
Editing has been completed.
``{plugin}_load_list``
Tells the the plugin to reload the media manager list.
``{plugin}_preview``
Tells the plugin it's item can be previewed.
``{plugin}_add_service_item``
Ask the plugin to push the selected items to the service item.
``{plugin}_service_load``
Ask the plugin to process an individual service item after it has been
loaded.
``{plugin}_config_updated``
The config has changed so tell the plugin about it.
``alerts_text``
Displays an alert message.
``bibles_nobook``
Attempt to find book resulted in no match.
``remotes_poll_request``
Waits for openlp to do something "interesting" and sends a
``remotes_poll_response`` signal when it does.
"""
def __init__(self):
"""
Initialise the event receiver, calling the parent constructor.
"""
QtCore.QObject.__init__(self)
def send_message(self, event, msg=None):
"""
Emit a Qt signal.
``event``
The event to that was sent.
``msg``
Defaults to *None*. The message to send with the event.
"""
log.debug(u'Event %s passed with payload %s' % (event, msg))
self.emit(QtCore.SIGNAL(event), msg)
class Receiver(object):
"""
Class to allow events to be passed from different parts of the system. This
is a static wrapper around the ``EventReceiver`` class. As there is only
one instance of it in the system the Qt4 signal/slot architecture can send
messages across the system.
To send a message:
``Receiver.send_message(u'<<Message ID>>', data)``
To receive a Message
``QtCore.QObject.connect(
Receiver.get_receiver(),
QtCore.SIGNAL(u'<<Message ID>>'),
<<ACTION>>
)``
"""
__eventreceiver__ = EventReceiver()
@staticmethod
def send_message(event, msg=None):
"""
Sends a message to the messaging system.
``event``
The event to send.
``msg``
Defaults to *None*. The message to send with the event.
"""
Receiver.__eventreceiver__.send_message(event, msg)
@staticmethod
def get_receiver():
"""
Get the global ``__eventreceiver__`` instance.
"""
return Receiver.__eventreceiver__
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