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# Copyright 2017 Canonical, Ltd.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, version 3.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
from urwid import (
Text,
)
styles = {
'dots': {
'texts': [t.replace('*', '\N{bullet}')
for t in ['|*----|', '|-*---|', '|--*--|', '|---*-|',
'|----*|', '|---*-|', '|--*--|', '|-*---|']],
'rate': 0.2,
},
'spin': {
'texts': ['-', '\\', '|', '/'],
'rate': 0.1,
},
}
class Spinner(Text):
def __init__(self, aio_loop=None, style='spin', align='center'):
self.aio_loop = aio_loop
self.spin_index = 0
self.spin_text = styles[style]['texts']
self.rate = styles[style]['rate']
super().__init__('', align=align)
self.handle = None
def spin(self):
self.spin_index = (self.spin_index + 1) % len(self.spin_text)
self.set_text(self.spin_text[self.spin_index])
def _advance(self):
self.spin()
self.handle = self.aio_loop.call_later(self.rate, self._advance)
def start(self):
self.stop()
self._advance()
def stop(self):
self.set_text('')
if self.handle is not None:
self.handle.cancel()
self.handle = None
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