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#! /usr/bin/env python3
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# -*- coding: utf-8 -*-
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"""
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Copyright 2020, Nils Hilbricht, Germany ( https://www.hilbricht.net )
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This file is part of the Laborejo Software Suite ( https://www.laborejo.org ).
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This application is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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"""
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import logging; logger = logging.getLogger(__name__); logger.info("import")
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from PyQt5 import QtCore
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class EventLoop(object):
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def __init__(self):
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"""The loop for all things GUI and controlling the GUI (e.g. by a control midi in port)
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By default use fastConnect.
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0 ms means "if there is time". 10ms-20ms is smooth. 100ms is still ok.
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Influences everything. Control Midi In Latency, playback cursor scrolling smoothnes etc.
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But not realtime. This is not the realtime loop. Converting midi into instrument sounds
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or playing back sequenced midi data is not handled by this loop at all.
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Creating a non-qt class for the loop is an abstraction layer that enables the engine to
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work without modification for non-gui situations. In this case it will use its own loop,
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like python async etc.
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A qt event loop needs the qt-app started. Otherwise it will not run.
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We init the event loop outside of main but call start from the mainWindow.
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"""
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self.fastLoop = QtCore.QTimer()
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self.slowLoop = QtCore.QTimer()
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def fastConnect(self, function):
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self.fastLoop.timeout.connect(function)
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def slowConnect(self, function):
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self.slowLoop.timeout.connect(function)
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def fastDisconnect(self, function):
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"""The function must be the exact instance that was registered"""
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self.fastLoop.timeout.disconnect(function)
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def slowDisconnect(self, function):
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"""The function must be the exact instance that was registered"""
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self.slowLoop.timeout.disconnect(function)
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def start(self):
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"""The event loop MUST be started after the Qt Application instance creation"""
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logger.info("Starting fast qt event loop")
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self.fastLoop.start(20)
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logger.info("Starting slow qt event loop")
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self.slowLoop.start(200)
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def stop(self):
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logger.info("Stopping fast qt event loop")
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self.fastLoop.stop()
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logger.info("Stopping slow qt event loop")
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self.slowLoop.stop()
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