111 lines
3.4 KiB
Python
111 lines
3.4 KiB
Python
# SPDX-License-Identifier: LGPL-3.0-or-later
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# Copyright (C) 2020 Daniel Thompson
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"""Digital clock
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~~~~~~~~~~~~~~~~
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Shows a time (as HH:MM) together with a battery meter and the date.
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"""
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import wasp
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import icons
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import fonts.clock as digits
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DIGITS = (
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digits.clock_0, digits.clock_1, digits.clock_2, digits.clock_3,
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digits.clock_4, digits.clock_5, digits.clock_6, digits.clock_7,
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digits.clock_8, digits.clock_9
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)
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MONTH = 'JanFebMarAprMayJunJulAugSepOctNovDec'
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class ClockApp():
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"""Simple digital clock application.
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.. figure:: res/ClockApp.png
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:width: 179
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Screenshot of the clock application
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"""
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NAME = 'Clock'
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ICON = icons.clock
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def foreground(self):
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"""Activate the application.
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Configure the status bar, redraw the display and request a periodic
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tick callback every second.
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"""
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wasp.system.bar.clock = False
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self._draw(True)
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wasp.system.request_tick(1000)
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def sleep(self):
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"""Prepare to enter the low power mode.
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:returns: True, which tells the system manager not to automatically
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switch to the default application before sleeping.
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"""
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return True
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def wake(self):
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"""Return from low power mode.
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Time will have changes whilst we have been asleep so we must
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udpate the display (but there is no need for a full redraw because
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the display RAM is preserved during a sleep.
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"""
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self._draw()
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def tick(self, ticks):
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"""Periodic callback to update the display."""
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self._draw()
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def _draw(self, redraw=False):
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"""Draw or lazily update the display.
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The updates are as lazy by default and avoid spending time redrawing
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if the time on display has not changed. However if redraw is set to
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True then a full redraw is be performed.
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"""
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draw = wasp.watch.drawable
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hi = wasp.system.theme('accent-hi')
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mid = wasp.system.theme('accent-mid')
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lo = wasp.system.theme('accent-lo')
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if redraw:
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now = wasp.watch.rtc.get_localtime()
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# Clear the display and draw that static parts of the watch face
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draw.fill()
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draw.blit(digits.clock_colon, 2*48, 80, fg=mid)
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# Redraw the status bar
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wasp.system.bar.draw()
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else:
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# The update is doubly lazy... we update the status bar and if
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# the status bus update reports a change in the time of day
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# then we compare the minute on display to make sure we
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# only update the main clock once per minute.
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now = wasp.system.bar.update()
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if not now or self._min == now[4]:
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# Skip the update
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return
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# Format the month as text
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month = now[1] - 1
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month = MONTH[month*3:(month+1)*3]
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# Draw the changeable parts of the watch face
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draw.blit(DIGITS[now[4] % 10], 4*48, 80, fg=hi)
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draw.blit(DIGITS[now[4] // 10], 3*48, 80, fg=lo)
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draw.blit(DIGITS[now[3] % 10], 1*48, 80, fg=hi)
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draw.blit(DIGITS[now[3] // 10], 0*48, 80, fg=lo)
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draw.set_color(hi)
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draw.string('{} {} {}'.format(now[2], month, now[0]),
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0, 180, width=240)
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# Record the minute that is currently being displayed
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self._min = now[4]
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