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120 lines
4.1 KiB
Python
120 lines
4.1 KiB
Python
# Copyright (c) 2013-2016 Christian Geier et al.
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#
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# Permission is hereby granted, free of charge, to any person obtaining
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# a copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish,
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# distribute, sublicense, and/or sell copies of the Software, and to
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# permit persons to whom the Software is furnished to do so, subject to
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# the following conditions:
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#
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# The above copyright notice and this permission notice shall be
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# included in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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import typing as T
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import urwid
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class SupportsNext:
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"""
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Classes inheriting from SupportsNext must implement the following methods:
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_select_first_selectable
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_select_last_selectable
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"""
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def __init__(self, *args, **kwargs):
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self.outermost = kwargs.get("outermost", False)
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if "outermost" in kwargs:
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kwargs.pop("outermost")
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super().__init__(*args, **kwargs)
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class NextMixin(SupportsNext):
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"""Implements SupportsNext for urwid.Pile and urwid.Columns"""
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def _select_first_selectable(self):
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"""
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select our first selectable item
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(recursively if that item SupportsNext)
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"""
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i = self._first_selectable()
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self.set_focus(i)
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if isinstance(self.contents[i][0], SupportsNext):
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self.contents[i][0]._select_first_selectable()
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def _select_last_selectable(self):
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"""
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select our last selectable item
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(recursively if that item SupportsNext)
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"""
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i = self._last_selectable()
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self.set_focus(i)
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if isinstance(self._contents[i][0], SupportsNext):
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self.contents[i][0]._select_last_selectable()
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def _first_selectable(self):
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"""return sequence number of self.contents last selectable item"""
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for j in range(0, len(self._contents)):
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if self._contents[j][0].selectable():
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return j
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return False
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def _last_selectable(self):
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"""return sequence number of self._contents last selectable item"""
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for j in range(len(self._contents) - 1, -1, -1):
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if self._contents[j][0].selectable():
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return j
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return False
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def keypress(self, size, key) -> T.Optional[str]:
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key = super().keypress(size, key)
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if key == "tab":
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if (
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self.outermost
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and self.focus_position == self._last_selectable()
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):
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self._select_first_selectable()
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return None
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for i in range(self.focus_position + 1, len(self._contents)):
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if self._contents[i][0].selectable():
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self.set_focus(i)
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if isinstance(self._contents[i][0], SupportsNext):
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self._contents[i][0]._select_first_selectable()
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return None
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elif key == "shift tab":
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if (
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self.outermost
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and self.focus_position == self._first_selectable()
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):
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self._select_last_selectable()
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return None
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for i in range(self.focus_position - 1, 0 - 1, -1):
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if self._contents[i][0].selectable():
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self.set_focus(i)
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if isinstance(self._contents[i][0], SupportsNext):
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self._contents[i][0]._select_last_selectable()
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return None
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return key
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class NPile(NextMixin, urwid.Pile):
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pass
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class NColumns(NextMixin, urwid.Columns):
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pass
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