annotate urwid_satext/keys.py @ 85:e0c8274f9b1c

added ability to replace shortcuts
author Goffi <goffi@goffi.org>
date Thu, 04 Sep 2014 17:13:19 +0200
parents 9f683df69a4c
children ea5b9a211bbb
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1 #!/usr/bin/python
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2 # -*- coding: utf-8 -*-
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3
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4 # Urwid SàT extensions
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5 # Copyright (C) 2009, 2010, 2011, 2012, 2013, 2014 Jérôme Poisson (goffi@goffi.org)
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6 #
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7 # This program is free software: you can redistribute it and/or modify
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8 # it under the terms of the GNU Lesser General Public License as published by
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9 # the Free Software Foundation, either version 3 of the License, or
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10 # (at your option) any later version.
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11 #
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12 # This program is distributed in the hope that it will be useful,
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13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 # GNU Lesser General Public License for more details.
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16 #
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17 # You should have received a copy of the GNU Lesser General Public License
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18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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19
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20 """This module manage action <==> key mapping and can be extended to add new actions"""
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21
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22
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23 class ConflictError(Exception):
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24 pass
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25
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26
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27 class ActionMap(dict):
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28 """Object which manage mapping betwwen actions and keys"""
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29
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30 def __init__(self, source_dict=None):
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31 """ Initialise the map
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32
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33 @param source_dict: dictionary-like object with actions to import
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34 """
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35 self._namespaces_actions = {} # key = namespace, values (set) = actions
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36 self._close_namespaces = tuple()
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37 self._alway_check_namespaces = None
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38 if source_dict is not None:
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39 self.update(source_dict)
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40
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41 def __setitem__(self, action, shortcut):
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42 """set an action avoiding conflicts
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43
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44 @param action (str,tuple): either an action (str) or a (namespace, action) tuple. action without namespace will not be checked by cbeck_namespaces(). namespace can also be a tuple itself, the action will the be assigned to several namespaces.
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45 @param shortcut (str): key shortcut for this action
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46 @raise: ConflictError if the action already exists
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47 """
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48 if isinstance(action, tuple):
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49 namespaces, action = action
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50 if not isinstance(namespaces, tuple):
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51 namespaces = (namespaces,)
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52 for namespace in namespaces:
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53 namespace_map = self._namespaces_actions.setdefault(namespace.lower(), set())
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54 namespace_map.add(action)
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55
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56 if action in self:
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57 raise ConflictError("The action [{}] already exists".format(action))
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58 return super(ActionMap, self).__setitem__(action, shortcut.lower())
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59
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60 def __delitem__(self, action):
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61 # we don't want to delete actions
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62 raise NotImplementedError
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63
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64 def replace_shortcut(self, action, shortcut):
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65 """Replace an existing action
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66
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67 @param action: name of an existing action
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68 @param shortcut: new shortcut to use
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69 @raise KeyError: action doesn't exists
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70 """
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71 assert isinstance(action, basestring)
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72 if action not in self:
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73 raise ValueError("Action [{}] doesn't exist".format(action))
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74 super(ActionMap, self).__setitem__(action, shortcut)
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75
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76 def update(self, new_actions):
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77 """Update actions with an other dictionary
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78
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79 @param new_actions: dictionary object to update actions
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80 @raise ValueError: something else than a dictionary is used
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81 @raise: ConflictError if at least one of the new actions already exists
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82 """
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83 if not isinstance(new_actions, dict):
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84 raise ValueError("only dictionary subclasses are accepted for update")
85
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85 conflict = new_actions.viewkeys() & self.viewkeys()
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86 if conflict:
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87 raise ConflictError("The actions [{}] already exists".format(','.join(conflict)))
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88 for action, shortcut in new_actions.iteritems():
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89 self[action] = shortcut
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90
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91 def replace(self, action_shortcuts_map):
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92 """Replace shortcuts with an other dictionary
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93
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94 @param action_shortcuts_map: dictionary like object to update shortcuts
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95 @raise ValueError: something else than a dictionary is used
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96 @raise KeyError: action doesn't exists
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97 """
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98 if not isinstance(action_shortcuts_map, dict):
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99 raise ValueError("only dictionary subclasses are accepted for replacing shortcuts")
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100 for action, shortcut in action_shortcuts_map.iteritems():
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101 self.replace_shortcut(action, shortcut)
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102
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103 def set_close_namespaces(self, close_namespaces, always_check=None):
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104 """Set namespaces where conflicting shortcut should not happen
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105
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106 used by check_namespaces to see if the same shortcut is not used in two close namespaces (e.g. 'tab' used in edit_bar and globally)
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107 @param close_namespaces (tuple of tuples): tuple indicating namespace where shortcut should not conflict. e.g.: (('global', 'edit'), ('confirm', 'popup', 'global')) indicate that shortcut in 'global' and 'edit' should not be the same, nor the ones between 'confirm', 'popup' and 'global'.
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108 @param always_check (tuple): if not None, these namespaces will be close to every other ones (useful for global namespace)
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109 """
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110 assert isinstance(close_namespaces, tuple)
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111 if always_check is not None:
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112 assert isinstance(always_check, tuple)
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113 self._close_namespaces = close_namespaces
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114 self._alway_check_namespaces = always_check
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115
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116 def check_namespaces(self):
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117 """Check that shortcuts are not conflicting in close namespaces"""
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118 # we first check each namespace individually
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119 checked = set()
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120
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121 def check_namespaces(namespaces):
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122 # for each namespace which save keys used
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123 # if 1 key is used several times, we raise
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124 # a ConflictError
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125 set_shortcuts = {}
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126
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127 to_check = set(namespaces + self._alway_check_namespaces)
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128
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129 for namespace in to_check:
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130 checked.add(namespace)
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131 for action in self._namespaces_actions[namespace]:
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132 shortcut = self[action]
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133 if shortcut in set_shortcuts:
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134 set_namespace = set_shortcuts[shortcut]
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135 if set_namespace == namespace:
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136 msg = 'shortcut [{}] is not unique in namespace "{}"'.format(shortcut, namespace)
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137 else:
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138 msg = 'shortcut [{}] is used both in namespaces "{}" and "{}"'.format(shortcut, set_namespace, namespace)
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139 raise ConflictError(msg)
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140 set_shortcuts[shortcut] = namespace
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141
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142 # we first check close namespaces
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143 for close_namespaces in self._close_namespaces:
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144 check_namespaces(close_namespaces)
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145
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146 # then the remaining ones
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147 for namespace in set(self._namespaces_actions.keys()).difference(checked):
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148 check_namespaces((namespace,))
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149
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150
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151 keys = {
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152 ("edit", "EDIT_HOME"): 'ctrl a',
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153 ("edit", "EDIT_END"): 'ctrl e',
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154 ("edit", "EDIT_DELETE_TO_END"): 'ctrl k',
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155 ("edit", "EDIT_DELETE_LAST_WORD"): 'ctrl w',
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156 ("edit", "EDIT_ENTER"): 'enter',
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157 ("edit", "EDIT_COMPLETE"): 'shift tab',
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158 (("edit", "modal"), "MODAL_ESCAPE"): 'esc',
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159 ("selectable", "TEXT_SELECT"): ' ',
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160 ("selectable", "TEXT_SELECT2"): 'enter',
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161 ("menu_box", "MENU_BOX_UP"): 'up',
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162 ("menu_box", "MENU_BOX_LEFT"): 'left',
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163 ("menu_box", "MENU_BOX_RIGHT"): 'right',
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164 ("menu", "MENU_DOWN"): 'down',
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165 ("menu", "MENU_UP"): 'up',
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166 ("menu_roller", "MENU_ROLLER_UP"): 'up',
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167 ("menu_roller", "MENU_ROLLER_DOWN"): 'down',
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168 ("menu_roller", "MENU_ROLLER_RIGHT"): 'right',
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169 ("columns_roller", "COLUMNS_ROLLER_LEFT"): 'left',
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170 ("columns_roller", "COLUMNS_ROLLER_RIGHT"): 'right',
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171 ("focus", "FOCUS_SWITCH"): 'tab',
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172 }
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173
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174 action_key_map = ActionMap(keys)