1b99764e8d
The main simplification is to adopt the status bar (with the status bar clock disabled) and to restructure the way draw and redraw are handled. Since the clock application is one of the most popular to customize it has also had extensive commenting added to describe how it works. Signed-off-by: Daniel Thompson <daniel@redfelineninja.org.uk>
109 lines
3.3 KiB
Python
109 lines
3.3 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 __init__(self):
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self._bar = wasp.widgets.StatusBar()
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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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self._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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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.rleblit(digits.clock_colon, pos=(2*48, 80), fg=0xb5b6)
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# Redraw the status bar
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self._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 = self._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.rleblit(DIGITS[now[4] % 10], pos=(4*48, 80))
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draw.rleblit(DIGITS[now[4] // 10], pos=(3*48, 80), fg=0xbdb6)
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draw.rleblit(DIGITS[now[3] % 10], pos=(1*48, 80))
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draw.rleblit(DIGITS[now[3] // 10], pos=(0*48, 80), fg=0xbdb6)
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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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