2858826921
Testing has demonstrated that del self.x does not make the memory used to store x available for garbage collection. There is clearly an additional reference from another place. In fact *after* del self.x then the memory can be made available for GC by assignment (e.g. self.x = None). However I haven't found how to release this reference and there is nothing in self.__dict__ that can help. For now we'll use a twp-step process where we set the variable to None before deleting it. This has a big impact on memory usage. For Software it is almost 1k (a.k.a. about 10% impact on free RAM). Signed-off-by: Daniel Thompson <daniel@redfelineninja.org.uk>
73 lines
2.2 KiB
Python
73 lines
2.2 KiB
Python
# SPDX-License-Identifier: LGPL-3.0-or-later
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# Copyright (C) 2020 Daniel Thompson
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"""Watch Face Chooser
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~~~~~~~~~~~~~~~~~~~~~
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A tool to select a suitable watch face.
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.. figure:: res/FacesApp.png
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:width: 179
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The app is intended to be enabled by default and has, therefore, been carefully
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structured to minimize memory usage when the app is not active.
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"""
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import wasp
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import icons
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class FacesApp():
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"""Choose a default watch face."""
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NAME = 'Faces'
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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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choices = []
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choices.append(('clock', 'Clock'))
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choices.append(('chrono', 'Chrono'))
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choices.append(('dual_clock', 'DualClock'))
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choices.append(('fibonacci_clock', 'FibonacciClock'))
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choices.append(('word_clock', 'WordClock'))
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self.choices = choices
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self.choice = 0
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self.si = wasp.widgets.ScrollIndicator()
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self._update()
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wasp.system.request_event(wasp.EventMask.SWIPE_UPDOWN)
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def background(self):
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self.choices = None
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del self.choices
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self.choice = None
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del self.choice
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self.si = None
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del self.si
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# When the watch face redraws then the change to the scrolling indicator
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# is a little subtle. Let's provide some haptic feedback too so the user
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# knows something has happened.
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wasp.watch.vibrator.pulse()
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def swipe(self, event):
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"""Notify the application of a touchscreen swipe event."""
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choice = self.choice
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if event[0] == wasp.EventType.DOWN:
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choice = choice - 1 if choice > 0 else len(self.choices)-1
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if event[0] == wasp.EventType.UP:
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choice = choice + 1 if choice < len(self.choices)-1 else 0
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self.choice = choice
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mute = wasp.watch.display.mute
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mute(True)
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self._update()
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mute(False)
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def _update(self):
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"""Draw the display from scratch."""
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wasp.watch.drawable.fill()
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(module, label) = self.choices[self.choice]
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wasp.system.register('apps.{}.{}App'.format(module, label), watch_face=True)
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wasp.system.quick_ring[0].preview()
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self.si.draw()
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