120 lines
3.5 KiB
Python
120 lines
3.5 KiB
Python
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# SPDX-License-Identifier: LGPL-3.0-or-later
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# Copyright (C) 2020 Daniel Thompson
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import wasp
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import icons
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import io
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import sys
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class PagerApp():
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"""Show long text in a pager.
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This is used to present text based information to the user. It is primarily
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intended for notifications but is also used to provide debugging
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information when applications crash.
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"""
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NAME = 'Pager'
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ICON = icons.app
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def __init__(self, msg):
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self._msg = msg
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self._scroll = wasp.widgets.ScrollIndicator()
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def foreground(self):
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"""Activate the application."""
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self._page = 0
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self._chunks = wasp.watch.drawable.wrap(self._msg, 240)
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self._numpages = (len(self._chunks) - 2) // 9
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wasp.system.request_event(wasp.EventMask.SWIPE_UPDOWN)
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self._draw()
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def background(self):
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del self._chunks
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del self._numpages
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def swipe(self, event):
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mute = wasp.watch.display.mute
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if event[0] == wasp.EventType.UP:
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if self._page >= self._numpages:
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wasp.system.navigate(wasp.EventType.BACK)
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return
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self._page += 1
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else:
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if self._page <= 0:
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wasp.watch.vibrator.pulse()
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return
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self._page -= 1
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mute(True)
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self._draw()
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mute(False)
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def _draw(self):
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"""Draw the display from scratch."""
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draw = wasp.watch.drawable
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draw.fill()
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page = self._page
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i = page * 9
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j = i + 11
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chunks = self._chunks[i:j]
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for i in range(len(chunks)-1):
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sub = self._msg[chunks[i]:chunks[i+1]].rstrip()
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draw.string(sub, 0, 24*i)
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scroll = self._scroll
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scroll.up = page > 0
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scroll.down = page < self._numpages
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scroll.draw()
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class CrashApp():
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"""Crash handler application.
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This application is launched automatically whenever another
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application crashes. Our main job it to indicate as loudly as
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possible that the system is no longer running correctly. This
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app deliberately enables inverted video mode in order to deliver
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that message as strongly as possible.
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"""
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def __init__(self, exc):
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"""Capture the exception information.
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This app does not actually display the exception information
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but we need to capture the exception info before we leave
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the except block.
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"""
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msg = io.StringIO()
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sys.print_exception(exc, msg)
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self._msg = msg.getvalue()
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msg.close()
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def foreground(self):
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"""Indicate the system has crashed by drawing a couple of bomb icons.
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If you owned an Atari ST back in the mid-eighties then I hope you
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recognise this as a tribute a long forgotten home computer!
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"""
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wasp.watch.display.invert(False)
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draw = wasp.watch.drawable
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draw.blit(icons.bomb, 0, 104)
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draw.blit(icons.bomb, 32, 104)
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wasp.system.request_event(wasp.EventMask.SWIPE_UPDOWN |
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wasp.EventMask.SWIPE_LEFTRIGHT)
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def background(self):
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"""Restore a normal display mode.
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Conceal the display before the transition otherwise the inverted
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bombs get noticed by the user.
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"""
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wasp.watch.display.mute(True)
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wasp.watch.display.invert(True)
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def swipe(self, event):
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"""Show the exception message in a pager.
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"""
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wasp.system.switch(PagerApp(self._msg))
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