Current File : //snap/core22/current/usr/share/subiquity/subiquitycore/ui/actionmenu.py
# Copyright 2018 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/>.
import attr
from urwid import (
ACTIVATE,
AttrWrap,
Button,
connect_signal,
LineBox,
PopUpLauncher,
SelectableIcon,
Text,
Widget,
)
from subiquitycore.ui.container import (
Columns,
ListBox,
WidgetWrap,
)
from subiquitycore.ui.utils import Color
class ActionBackButton(Button):
button_left = Text("\N{BLACK LEFT-POINTING SMALL TRIANGLE}")
button_right = Text("")
class ActionMenuOpenButton(Button):
button_left = Text("")
button_right = Text("\N{BLACK RIGHT-POINTING SMALL TRIANGLE}")
class ActionMenuButton(Button):
button_left = Text("")
button_right = Text("")
class _ActionMenuDialog(WidgetWrap):
"""A list of action buttons with a box around them."""
def __init__(self, parent):
self.parent = parent
close_text = "(close)"
close = ActionBackButton(close_text)
connect_signal(close, "click", self.close)
group = [Color.menu_button(close)]
width = len(close_text)
for i, action in enumerate(self.parent._actions):
if action.enabled:
if isinstance(action.label, Widget):
btn = action.label
elif action.opens_dialog:
btn = Color.menu_button(ActionMenuOpenButton(action.label))
else:
btn = Color.menu_button(ActionMenuButton(action.label))
width = max(width, len(btn.base_widget.label))
connect_signal(
btn.base_widget, 'click', self.click, action.value)
else:
label = action.label
if isinstance(label, Widget):
label = label.base_widget.label
width = max(width, len(label))
if action.opens_dialog:
rhs = "\N{BLACK RIGHT-POINTING SMALL TRIANGLE}"
else:
rhs = ""
btn = Columns([
('fixed', 1, Text("")),
Text(label),
('fixed', 1, Text(rhs)),
], dividechars=1)
btn = AttrWrap(btn, 'info_minor')
group.append(btn)
self.width = width
super().__init__(Color.body(LineBox(ListBox(group))))
def close(self, sender):
self.parent.close_pop_up()
def click(self, btn, value):
self.parent._action(value)
self.parent.close_pop_up()
def keypress(self, size, key):
if key == 'esc':
self.parent.close_pop_up()
else:
return super().keypress(size, key)
@attr.s
class Action:
# The label that is shown in the menu
label = attr.ib()
enabled = attr.ib()
# The value passed along with the 'action' signal
value = attr.ib()
# Actions that open a dialog get a > at the end.
opens_dialog = attr.ib(default=False)
class ActionMenu(PopUpLauncher):
signals = ['action', 'open', 'close']
def __init__(self, opts,
icon="\N{BLACK RIGHT-POINTING SMALL TRIANGLE}"):
self._actions = []
for opt in opts:
if not isinstance(opt, Action):
opt = Action(*opt)
self._actions.append(opt)
self.icon = icon
self._button = SelectableIcon(self.icon, 0)
super().__init__(self._button)
self._dialog = _ActionMenuDialog(self)
def get_natural_width(self):
return len(self.icon)
def keypress(self, size, key):
if self._command_map[key] != ACTIVATE:
return key
self.open_pop_up()
def _action(self, action):
self._emit("action", action)
def open_pop_up(self):
self._dialog._w.base_widget.focus_position = 0
self._emit("open")
super().open_pop_up()
def close_pop_up(self):
self._emit("close")
super().close_pop_up()
def create_pop_up(self):
return self._dialog
def get_pop_up_parameters(self):
width = self._dialog.width + 7
return {
'left': 1,
'top': -1,
'overlay_width': width,
'overlay_height': len(self._actions) + 3,
}
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