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# Copyright 2015 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/>.
""" View policy
Contains some default key navigations
"""
import logging
from urwid import (
emit_signal,
Overlay,
Text,
)
from subiquitycore.ui.container import (
Columns,
Pile,
WidgetWrap,
)
from subiquitycore.ui.stretchy import StretchyOverlay
from subiquitycore.ui.utils import disabled, undisabled
log = logging.getLogger('subiquitycore.view')
class BaseView(WidgetWrap):
def local_help(self):
"""Help for what the user is currently looking at.
Returns title, documentation (or None, None).
"""
return None, None
def show_overlay(self, overlay_widget, **kw):
args = dict(
align='center',
width=('relative', 60),
min_width=80,
valign='middle',
height='pack'
)
PADDING = 3
# Don't expect callers to account for the padding if
# they pass a fixed width.
if 'width' in kw:
if isinstance(kw['width'], int):
kw['width'] += 2*PADDING
args.update(kw)
top = Pile([
('pack', Text("")),
Columns([
(PADDING, Text("")),
overlay_widget,
(PADDING, Text(""))
]),
('pack', Text("")),
])
self._w = Overlay(top_w=top, bottom_w=disabled(self._w), **args)
def show_stretchy_overlay(self, stretchy):
emit_signal(stretchy, 'opened')
stretchy.opened()
self._w = StretchyOverlay(disabled(self._w), stretchy)
def remove_overlay(self, stretchy=None):
if stretchy is not None:
one_above = None
cur = self._w
while isinstance(cur, (StretchyOverlay, Overlay)):
cur_stretchy = getattr(cur, 'stretchy', None)
if cur_stretchy is stretchy:
emit_signal(stretchy, 'closed')
stretchy.closed()
if one_above is not None:
one_above.bottom_w = cur.bottom_w
else:
self._w = undisabled(cur.bottom_w)
return
one_above = cur
cur = undisabled(cur.bottom_w)
else:
if isinstance(self._w, StretchyOverlay):
emit_signal(self._w.stretchy, 'closed')
self._w.stretchy.closed()
self._w = undisabled(self._w.bottom_w)
def cancel(self):
pass
def keypress(self, size, key):
key = super().keypress(size, key)
if key == 'esc':
if hasattr(self._w, 'bottom_w'):
self.remove_overlay()
return None
else:
self.cancel()
return None
return key
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