183 lines
5.2 KiB
Python
183 lines
5.2 KiB
Python
# Copyright 2017 Canonical, Ltd.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as
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# published by the Free Software Foundation, either version 3 of the
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# License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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from urwid import (
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ACTIVATE,
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AttrWrap,
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connect_signal,
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LineBox,
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PopUpLauncher,
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SelectableIcon,
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Text,
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WidgetWrap,
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)
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from subiquitycore.ui.container import ListBox
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class _PopUpButton(SelectableIcon):
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"""It looks a bit like a radio button, but it just emits
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'click' on activation.
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"""
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signals = ['click']
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states = {
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True: "(+) ",
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False: "( ) ",
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}
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def __init__(self, option, state):
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p = self.states[state]
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super().__init__(p + option, len(p))
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def keypress(self, size, key):
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if self._command_map[key] != ACTIVATE:
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return key
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self._emit('click')
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class _PopUpSelectDialog(WidgetWrap):
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"""A list of PopUpButtons with a box around them."""
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def __init__(self, parent, cur_index):
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self.parent = parent
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group = []
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for i, option in enumerate(self.parent._options):
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if option.enabled:
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btn = _PopUpButton(option.label, state=(i == cur_index))
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connect_signal(btn, 'click', self.click, i)
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group.append(AttrWrap(btn, 'menu_button', 'menu_button focus'))
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else:
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btn = Text(" " + option.label)
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group.append(AttrWrap(btn, 'info_minor'))
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list_box = ListBox(group)
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list_box.base_widget.focus_position = cur_index
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super().__init__(LineBox(list_box))
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def click(self, btn, index):
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self.parent.index = index
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self.parent.close_pop_up()
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def keypress(self, size, key):
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if key == 'esc':
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self.parent.close_pop_up()
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else:
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return super().keypress(size, key)
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class SelectorError(Exception):
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pass
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class Option:
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def __init__(self, val):
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if not isinstance(val, tuple):
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if not isinstance(val, str):
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raise SelectorError("invalid option %r", val)
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self.label = val
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self.enabled = True
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self.value = val
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elif len(val) == 1:
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self.label = val[0]
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self.enabled = True
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self.value = val[0]
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elif len(val) == 2:
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self.label = val[0]
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self.enabled = val[1]
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self.value = val[0]
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elif len(val) == 3:
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self.label = val[0]
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self.enabled = val[1]
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self.value = val[2]
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else:
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raise SelectorError("invalid option %r", val)
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class Selector(PopUpLauncher):
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"""A widget that allows the user to chose between options by popping
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up a list of options.
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(A bit like <select> in an HTML form).
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"""
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_prefix = "(+) "
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signals = ['select']
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def __init__(self, opts, index=0):
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self._options = []
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for opt in opts:
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if not isinstance(opt, Option):
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opt = Option(opt)
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self._options.append(opt)
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self._button = SelectableIcon(self._prefix, len(self._prefix))
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self._set_index(index)
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super().__init__(self._button)
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def keypress(self, size, key):
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if self._command_map[key] != ACTIVATE:
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return key
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self.open_pop_up()
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def _set_index(self, val):
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self._button.set_text(self._prefix + self._options[val].label)
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self._index = val
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@property
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def index(self):
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return self._index
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@index.setter
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def index(self, val):
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self._emit('select', self._options[val].value)
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self._set_index(val)
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def option_by_label(self, label):
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for opt in self._options:
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if opt.label == label:
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return opt
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def option_by_value(self, value):
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for opt in self._options:
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if opt.value == value:
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return opt
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def option_by_index(self, index):
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return self._options[index]
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@property
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def value(self):
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return self._options[self._index].value
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@value.setter
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def value(self, val):
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for i, opt in enumerate(self._options):
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if opt.value == val:
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self.index = i
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return
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raise AttributeError("cannot set value to %r", val)
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def create_pop_up(self):
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return _PopUpSelectDialog(self, self.index)
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def get_pop_up_parameters(self):
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# line on left, space, line on right
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width = (max([len(o.label) for o in self._options]) +
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len(self._prefix) + 3)
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return {'left': -1, 'top': -self.index - 1,
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'overlay_width': width,
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'overlay_height': len(self._options) + 2}
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