220 lines
6.4 KiB
Python
220 lines
6.4 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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Padding as UrwidPadding,
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PopUpLauncher,
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SelectableIcon,
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Text,
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)
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from subiquitycore.ui.container import (
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Columns,
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ListBox,
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WidgetWrap,
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)
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from subiquitycore.ui.utils import ClickableIcon
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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 = ClickableIcon(" " + option.label)
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connect_signal(btn, 'click', self.click, i)
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if i == cur_index:
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rhs = '\N{BLACK LEFT-POINTING SMALL TRIANGLE} '
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else:
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rhs = ' '
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btn = Columns([
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btn,
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(2, Text(rhs)),
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])
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btn = AttrWrap(btn, 'menu_button', 'menu_button focus')
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else:
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btn = Text(" " + option.label)
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btn = AttrWrap(btn, 'info_minor')
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btn = UrwidPadding(btn, width=self.parent._padding.width)
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group.append(btn)
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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 _Launcher(PopUpLauncher):
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# PopUpLauncher is a WidgetDecoration, which means base_widget
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# steps past it. This means that if Selector just inherited from
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# PopUpLauncher, calling .base_widget on a (say) Padding
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# containing a Selector would return the SelectableIcon, not the
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# Selector. This is unhelpful, to put it mildly, so we do some
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# proxying about so that PopUpLauncher can inherit from WidgetWrap
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# instead.
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def __init__(self, parent, child):
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self.parent = parent
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super().__init__(child)
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def create_pop_up(self):
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return self.parent.create_pop_up()
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def get_pop_up_parameters(self):
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return self.parent.get_pop_up_parameters()
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class Selector(WidgetWrap):
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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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signals = ['select']
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def __init__(self, opts, index=0):
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self._icon = SelectableIcon("", 0)
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self._padding = UrwidPadding(AttrWrap(
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Columns([
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(1, Text('[')),
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self._icon,
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(3, Text('\N{BLACK DOWN-POINTING SMALL TRIANGLE} ]')),
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], dividechars=1),
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'menu_button', 'menu_button focus'))
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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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options.append(opt)
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self.options = options
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self._set_index(index)
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super().__init__(_Launcher(self, self._padding))
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def get_natural_width(self):
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return self._padding.width
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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._icon.set_text(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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@property
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def options(self):
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return self._options[:]
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@options.setter
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def options(self, val):
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self._options = val
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self._padding.width = max([len(o.label) for o in self._options]) + 6
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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._set_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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return {'left': 0, 'top': -self.index - 1,
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'overlay_width': self._padding.width,
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'overlay_height': len(self._options) + 2}
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def open_pop_up(self):
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self._w.open_pop_up()
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def close_pop_up(self):
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self._w.close_pop_up()
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