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>
115 lines
3.5 KiB
Python
115 lines
3.5 KiB
Python
# SPDX-License-Identifier: LGPL-3.0-or-later
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# Copyright (C) 2020 Daniel Thompson
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"""Software
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~~~~~~~~~~~
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A tool to enable/disable applications.
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.. figure:: res/SoftwareApp.png
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:width: 179
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Most applications are disabled by default at boot in order to conserve
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RAM (which is in short supply and very useful to anyone wanting to
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write an application). This tools allows us to boot and conserve RAM
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whilst still allowing users to activate so many awesome applications!
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"""
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import wasp
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import icons
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class SoftwareApp():
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"""Enable and disable applications."""
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NAME = 'Software'
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ICON = icons.software
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def foreground(self):
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"""Activate the application."""
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def factory(label):
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nonlocal y
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cb = wasp.widgets.Checkbox(0, y, label)
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y += 40
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if y > 160:
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y = 0
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return cb
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y = 0
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db = []
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db.append(('alarm', factory('Alarm')))
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db.append(('calc', factory('Calculator')))
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db.append(('faces', factory('Faces')))
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db.append(('gameoflife', factory('Game Of Life')))
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db.append(('musicplayer', factory('Music Player')))
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db.append(('play2048', factory('Play 2048')))
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db.append(('snake', factory('Snake Game')))
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db.append(('sports', factory('Sports')))
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db.append(('flashlight', factory('Torch')))
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db.append(('testapp', factory('Test')))
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db.append(('timer', factory('Timer')))
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db.append(('weather', factory('Weather')))
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# Get the initial state for the checkboxes
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for _, checkbox in db:
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label = checkbox.label.replace(' ', '')
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for app in wasp.system.launcher_ring:
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if type(app).__name__.startswith(label):
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checkbox.state = True
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break
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self.si = wasp.widgets.ScrollIndicator()
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self.page = 0
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self.db = db
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self._draw()
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wasp.system.request_event(wasp.EventMask.TOUCH |
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wasp.EventMask.SWIPE_UPDOWN)
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def background(self):
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self.si = None
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del self.si
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self.page = None
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del self.page
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self.db = None
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del self.db
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def get_page(self):
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i = self.page * 5
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return self.db[i:i+5]
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def swipe(self, event):
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"""Notify the application of a touchscreen swipe event."""
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page = self.page
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pages = (len(self.db)-1) // 5
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if event[0] == wasp.EventType.DOWN:
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page = page - 1 if page > 0 else pages
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if event[0] == wasp.EventType.UP:
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page = page + 1 if page < pages else 0
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self.page = page
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mute = wasp.watch.display.mute
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mute(True)
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self._draw()
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mute(False)
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def touch(self, event):
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"""Notify the application of a touchscreen touch event."""
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for module, checkbox in self.get_page():
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if checkbox.touch(event):
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label = checkbox.label.replace(' ', '')
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if checkbox.state:
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wasp.system.register('apps.{}.{}App'.format(module, label))
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else:
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for app in wasp.system.launcher_ring:
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if type(app).__name__.startswith(label):
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wasp.system.launcher_ring.remove(app)
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break
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break
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def _draw(self):
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"""Draw the display from scratch."""
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wasp.watch.drawable.fill()
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self.si.draw()
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for _, checkbox in self.get_page():
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checkbox.draw()
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