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#!/usr/bin/python
#
# Urwid CommandMap class
# Copyright (C) 2004-2011 Ian Ward
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# Urwid web site: http://excess.org/urwid/
from __future__ import division, print_function
REDRAW_SCREEN = 'redraw screen'
CURSOR_UP = 'cursor up'
CURSOR_DOWN = 'cursor down'
CURSOR_LEFT = 'cursor left'
CURSOR_RIGHT = 'cursor right'
CURSOR_PAGE_UP = 'cursor page up'
CURSOR_PAGE_DOWN = 'cursor page down'
CURSOR_MAX_LEFT = 'cursor max left'
CURSOR_MAX_RIGHT = 'cursor max right'
ACTIVATE = 'activate'
class CommandMap(object):
"""
dict-like object for looking up commands from keystrokes
Default values (key: command)::
'tab': 'next selectable',
'ctrl n': 'next selectable',
'shift tab': 'prev selectable',
'ctrl p': 'prev selectable',
'ctrl l': 'redraw screen',
'esc': 'menu',
'up': 'cursor up',
'down': 'cursor down',
'left': 'cursor left',
'right': 'cursor right',
'page up': 'cursor page up',
'page down': 'cursor page down',
'home': 'cursor max left',
'end': 'cursor max right',
' ': 'activate',
'enter': 'activate',
"""
_command_defaults = {
'tab': 'next selectable',
'ctrl n': 'next selectable',
'shift tab': 'prev selectable',
'ctrl p': 'prev selectable',
'ctrl l': REDRAW_SCREEN,
'esc': 'menu',
'up': CURSOR_UP,
'down': CURSOR_DOWN,
'left': CURSOR_LEFT,
'right': CURSOR_RIGHT,
'page up': CURSOR_PAGE_UP,
'page down': CURSOR_PAGE_DOWN,
'home': CURSOR_MAX_LEFT,
'end': CURSOR_MAX_RIGHT,
' ': ACTIVATE,
'enter': ACTIVATE,
}
def __init__(self):
self.restore_defaults()
def restore_defaults(self):
self._command = dict(self._command_defaults)
def __getitem__(self, key):
return self._command.get(key, None)
def __setitem__(self, key, command):
self._command[key] = command
def __delitem__(self, key):
del self._command[key]
def clear_command(self, command):
dk = [k for k, v in self._command.items() if v == command]
for k in dk:
del self._command[k]
def copy(self):
"""
Return a new copy of this CommandMap, likely so we can modify
it separate from a shared one.
"""
c = CommandMap()
c._command = dict(self._command)
return c
command_map = CommandMap() # shared command mappings
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