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zendisplay.py
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zendisplay.py
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#!/usr/bin/env python3
"""Small script to adjust display brightness according to ambient lighting"""
import os
from PyQt5 import QtWidgets
from PyQt5 import QtGui
from PyQt5 import QtCore
from displays import Displays
from luminance_sources import LuminanceSourceManager
from luminance_iio import LuminanceIIO
from luminance_manual import LuminanceManual
from luminance_mqtt import LuminanceMQTT
DEFAULT_SENSOR = 0
MQTT_HOST = None
MQTT_TOPIC = None
MQTT_PUBLISH = False
class Controller:
"""Recommends new brightness value based on current data"""
def __init__(self):
self.brightness_margin = 5
self.line_m = 0.1151079
self.line_b = 30.61871
def calculate_brightness(self, luminance):
"""Calculate brightness from ambient lighting"""
value = round(self.line_m * luminance + self.line_b)
return max(min(100, value), 0)
def recommend_brightness(self, current_luminance, current_brightness):
"""Get a new brightness value based on current data"""
recommended_brightness = self.calculate_brightness(current_luminance)
if abs(current_brightness - recommended_brightness) < self.brightness_margin:
recommended_brightness = current_brightness
else:
print("Brightness: ", end='')
print(str(current_brightness) + "% -> " + str(recommended_brightness) + "% ", end='')
print("(luminance: " + str(current_luminance) + " lx)")
return recommended_brightness
def get_range(self):
"""Calculate the full range of the controller"""
range_min = (0 - self.line_b) / self.line_m
range_max = (100 - self.line_b) / self.line_m
return {'min': range_min, 'max': range_max}
class ZenDisplay(QtWidgets.QSystemTrayIcon):
"""System tray icon class"""
def __init__(self):
super().__init__()
self.controller = Controller()
self.displays = Displays()
if len(self.displays) == 0:
print('Could not find supported displays')
quit()
self.sensors = LuminanceSourceManager()
self.sensors.add_source_type(LuminanceIIO)
self.sensors.add_source_type(LuminanceMQTT, {'topic': MQTT_TOPIC, 'host': MQTT_HOST})
manual_parameters = self.controller.get_range()
manual_parameters.update({'value': self.displays.get_brightness()})
self.sensors.add_source_type(LuminanceManual, manual_parameters)
self.sensors.activate(DEFAULT_SENSOR)
self.menu = self.construct_menu()
self.menu_visible = False
self.setContextMenu(self.menu)
self.activated.connect(lambda reason: self.action_click(reason, self))
self.timer = QtCore.QTimer()
self.timer.timeout.connect(self.main_control)
self.timer.start(1000)
if MQTT_PUBLISH is True:
self.mqtt_publisher = LuminanceMQTT(name="mqttp", path=MQTT_TOPIC, host=MQTT_HOST)
def toggle_menu(self):
"""Toggle context menu visibility"""
if self.menu_visible:
self.menu.hide()
else:
self.menu.popup(QtGui.QCursor.pos())
self.menu_visible = not self.menu_visible
def construct_menu(self):
"""Construct a menu from the sitemap"""
menu = QtWidgets.QMenu()
self.construct_menu_displays(menu)
self.construct_menu_sensors(menu)
# Create quit button
menu.addSeparator()
action_quit = menu.addAction("Quit")
action_quit.triggered.connect(lambda _: quit())
return menu
def construct_menu_displays(self, parent):
"""Create submenu for displays"""
display_menu = parent.addMenu('Displays')
for display in self.displays:
action = display_menu.addAction(display['name'])
action.setCheckable(True)
action.setChecked(display['use'])
did = display['id']
action.triggered.connect(lambda state, did=did: self.displays.set_active(did, state))
def construct_menu_sensors(self, parent):
"""Create submenu for sensors"""
sensor_menu = parent.addMenu('Sensors')
sensor_group = QtWidgets.QActionGroup(sensor_menu, exclusive=True)
for sensor in self.sensors:
action = sensor_menu.addAction(sensor.name + " (" + sensor.path + ")")
action.setCheckable(True)
if sensor.uid == self.sensors.get_active():
action.setChecked(True)
sid = sensor.uid
action.triggered.connect(lambda state, sid=sid: self.sensors.activate(sid))
sensor_group.addAction(action)
def main_control(self):
"""Main control function, sets display brightness dynamically"""
luminance = self.sensors.get_luminance()
current_brightness = self.displays.get_brightness()
recommended_brightness = self.controller.recommend_brightness(luminance, current_brightness)
self.setToolTip('Brightness: ' + str(recommended_brightness) + '%')
self.displays.set_brightness(recommended_brightness)
if MQTT_PUBLISH is True:
self.mqtt_publisher.publish(luminance)
def event(self, event):
"""Event handler for QEvent objects"""
if event.type() == QtCore.QEvent.Wheel:
new_value = None
if event.angleDelta().y() < 0:
new_value = self.sensors[self.sensors.get_active()].decrease()
else:
new_value = self.sensors[self.sensors.get_active()].increase()
if new_value is not None and self.supportsMessages():
self.showMessage('Brightness', str(new_value) + '%', msecs=500)
return True
return False
@classmethod
@QtCore.pyqtSlot()
def action_click(cls, reason, tray):
"""Toggle menu on click"""
if reason in [QtWidgets.QSystemTrayIcon.Trigger, QtWidgets.QSystemTrayIcon.Context]:
tray.toggle_menu()
APP = QtWidgets.QApplication([])
APP.setQuitOnLastWindowClosed(False)
ZENDISPLAY = ZenDisplay()
ZENDISPLAY.setIcon(QtGui.QIcon(os.path.join(
os.path.dirname(os.path.realpath(__file__)),
"icon.png",
)))
ZENDISPLAY.show()
APP.exec_()