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annotate frontends/src/quick_frontend/quick_widgets.py @ 1312:9e904f8a094e frontends_multi_profiles

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quick_frontend: getOrCreateWidget callbacks can return another widget
author souliane <souliane@mailoo.org>
date Mon, 09 Feb 2015 09:19:30 +0100
parents 9ca93ecdeea5
children e9888db0eb0c
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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 # helper class for making a SAT frontend
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5 # Copyright (C) 2009, 2010, 2011, 2012, 2013, 2014 Jérôme Poisson (goffi@goffi.org)
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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 Affero 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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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 Affero General Public License for more details.
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17 # You should have received a copy of the GNU Affero General Public License
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18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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20 from sat.core.log import getLogger
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21 log = getLogger(__name__)
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22 from sat.core import exceptions
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24 from sat_frontends.quick_frontend.constants import Const as C
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26 classes_map = {}
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29 try:
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30 # FIXME: to be removed when an acceptable solution is here
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31 unicode('') # XXX: unicode doesn't exist in pyjamas
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32 except (TypeError, AttributeError): # Error raised is not the same depending on pyjsbuild options
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33 unicode = str
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34
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36 def register(base_cls, child_cls=None):
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37 """Register a child class to use by default when a base class is needed
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39 @param base_cls: "Quick..." base class (like QuickChat or QuickContact), must inherit from QuickWidget
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40 @param child_cls: inherited class to use when Quick... class is requested, must inherit from base_cls.
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41 Can be None if it's the base_cls itself which register
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42 """
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43 # FIXME: we use base_cls.__name__ instead of base_cls directly because pyjamas because
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44 # in the second case
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45 classes_map[base_cls.__name__] = child_cls
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47
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48 class WidgetAlreadyExistsError(Exception):
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49 pass
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52 class QuickWidgetsManager(object):
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53 """This class is used to manage all the widgets of a frontend
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54 A widget can be a window, a graphical thing, or someting else depending of the frontend"""
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55
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56 def __init__(self, host):
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57 self.host = host
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58 self._widgets = {}
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59
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60 def __iter__(self):
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61 """Iterate throught all widgets"""
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62 for widget_map in self._widgets.itervalues():
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63 for widget in widget_map.itervalues():
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64 yield widget
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66 def getRealClass(self, class_):
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67 """Return class registered for given class_
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68
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69 @param class_: subclass of QuickWidget
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70 @return: class actually used to create widget
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71 """
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72 try:
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73 # FIXME: we use base_cls.__name__ instead of base_cls directly because pyjamas bugs
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74 # in the second case
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75 cls = classes_map[class_.__name__]
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76 except KeyError:
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77 cls = class_
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78 if cls is None:
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79 raise exceptions.InternalError("There is not class registered for {}".format(class_))
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80 return cls
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81
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82 def getWidgets(self, class_):
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83 """Get all subclassed widgets
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84
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85 @param class_: subclass of QuickWidget, same parameter as used in [getOrCreateWidget]
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86 @return: iterator on widgets
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87 """
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88 class_ = self.getRealClass(class_)
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89 try:
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90 widgets_map = self._widgets[class_.__name__]
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91 except KeyError:
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92 return iter([])
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93 else:
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94 return widgets_map.itervalues()
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95
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96 def getOrCreateWidget(self, class_, target, *args, **kwargs):
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97 """Get an existing widget or create a new one when necessary
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98
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99 If the widget is new, self.host.newWidget will be called with it.
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100 @param class_(class): class of the widget to create
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101 @param target: target depending of the widget, usually a JID instance
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102 @param args(list): optional args to create a new instance of class_
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103 @param kwargs(dict): optional kwargs to create a new instance of class_
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104 if 'profile' key is present, it will be popped and put in 'profiles'
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105 if there is neither 'profile' nor 'profiles', None will be used for 'profiles'
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106 if 'on_new_widget' is present it can have the following values:
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107 C.WIDGET_NEW [default]: self.host.newWidget will be called on widget creation
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108 [callable]: this method will be called instead of self.host.newWidget,
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109 and can return another widget to modify the result of the present method
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110 None: do nothing
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111 if 'on_existing_widget' is present it can have the following values:
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112 C.WIDGET_KEEP [default]: return the existing widget
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parents: 1290
diff changeset
113 C.WIDGET_RAISE: raise WidgetAlreadyExistsError
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parents: 1290
diff changeset
114 C.WIDGET_RECREATE: create a new widget *WITH A NEW HASH*
1312
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parents: 1310
diff changeset
115 [callable]: this method will be called with existing widget as argument,
9e904f8a094e quick_frontend: getOrCreateWidget callbacks can return another widget
souliane <souliane@mailoo.org>
parents: 1310
diff changeset
116 and can return another widget to modify the result of the present method
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diff changeset
117 if 'force_hash' is present, the hash given in value will be used instead of the one returned by class_.getWidgetHash
1307
9512590dc3d7 quick_ frontend (quick widgets): added explanation in docstring for non special keywords in getOrCreateWidget
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parents: 1304
diff changeset
118 other keys will be used to instanciate class_ if the case happen (e.g. if type_ is present and class_ is a QuickChat subclass,
9512590dc3d7 quick_ frontend (quick widgets): added explanation in docstring for non special keywords in getOrCreateWidget
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parents: 1304
diff changeset
119 it will be used to create a new QuickChat instance).
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120 @return: a class_ instance, either new or already existing
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diff changeset
121 """
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diff changeset
122 cls = self.getRealClass(class_)
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parents: 1139
diff changeset
123
1301
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diff changeset
124 ## arguments management ##
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125 _args = [self.host, target] + list(args) or [] # FIXME: check if it's really necessary to use optional args
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parents: 1139
diff changeset
126 _kwargs = kwargs or {}
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parents: 1139
diff changeset
127 if 'profiles' in _kwargs and 'profile' in _kwargs:
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parents: 1139
diff changeset
128 raise ValueError("You can't have 'profile' and 'profiles' keys at the same time")
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diff changeset
129 try:
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diff changeset
130 _kwargs['profiles'] = _kwargs.pop('profile')
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diff changeset
131 except KeyError:
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parents: 1139
diff changeset
132 if not 'profiles' in _kwargs:
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diff changeset
133 _kwargs['profiles'] = None
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diff changeset
134
1301
afc57b34c0a3 Quick Frontend (quick_widgets): added on_existing_widget in getOrCreateWidget (see docstring for more infos) + use of constants
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parents: 1290
diff changeset
135 #on_new_widget tell what to do for the new widget creation
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parents: 1290
diff changeset
136 try:
afc57b34c0a3 Quick Frontend (quick_widgets): added on_existing_widget in getOrCreateWidget (see docstring for more infos) + use of constants
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diff changeset
137 on_new_widget = _kwargs.pop('on_new_widget')
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diff changeset
138 except KeyError:
afc57b34c0a3 Quick Frontend (quick_widgets): added on_existing_widget in getOrCreateWidget (see docstring for more infos) + use of constants
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diff changeset
139 on_new_widget = C.WIDGET_NEW
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parents: 1290
diff changeset
140
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diff changeset
141 #on_existing_widget tell what to do when the widget already exists
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diff changeset
142 try:
afc57b34c0a3 Quick Frontend (quick_widgets): added on_existing_widget in getOrCreateWidget (see docstring for more infos) + use of constants
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diff changeset
143 on_existing_widget = _kwargs.pop('on_existing_widget')
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diff changeset
144 except KeyError:
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diff changeset
145 on_existing_widget = C.WIDGET_KEEP
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diff changeset
146
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diff changeset
147 ## we get the hash ##
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148 try:
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parents: 1139
diff changeset
149 hash_ = _kwargs.pop('force_hash')
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diff changeset
150 except KeyError:
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parents: 1139
diff changeset
151 hash_ = cls.getWidgetHash(target, _kwargs['profiles'])
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diff changeset
152
1304
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parents: 1303
diff changeset
153 ## widget creation or retrieval ##
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parents: 1303
diff changeset
154
1a61b18703c4 quick frontend (quick widgets): class' __name__ method is used for classes_map hash because the use of class directly was causing bugs with pyjamas (difficult to find, several MicroblogPanel instances were added only once in Libervia's TabPanel, hash method seemed buggy)
Goffi <goffi@goffi.org>
parents: 1303
diff changeset
155 widgets_map = self._widgets.setdefault(cls.__name__, {}) # we sorts widgets by classes
1265
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156 if not cls.SINGLE:
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diff changeset
157 widget = None # if the class is not SINGLE, we always create a new widget
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diff changeset
158 else:
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parents: 1139
diff changeset
159 try:
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diff changeset
160 widget = widgets_map[hash_]
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diff changeset
161 widget.addTarget(target)
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diff changeset
162 except KeyError:
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diff changeset
163 widget = None
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diff changeset
164
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diff changeset
165 if widget is None:
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parents: 1139
diff changeset
166 # we need to create a new widget
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diff changeset
167 log.debug(u"Creating new widget for target {} {}".format(target, cls))
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diff changeset
168 widget = cls(*_args, **_kwargs)
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diff changeset
169 widgets_map[hash_] = widget
0
goffi@necton2
parents:
diff changeset
170
1301
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diff changeset
171 if on_new_widget == C.WIDGET_NEW:
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diff changeset
172 self.host.newWidget(widget)
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diff changeset
173 elif callable(on_new_widget):
1312
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diff changeset
174 result = on_new_widget(widget)
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souliane <souliane@mailoo.org>
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diff changeset
175 if isinstance(result, QuickWidget):
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souliane <souliane@mailoo.org>
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diff changeset
176 widget = result
1265
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diff changeset
177 else:
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diff changeset
178 assert on_new_widget is None
1301
afc57b34c0a3 Quick Frontend (quick_widgets): added on_existing_widget in getOrCreateWidget (see docstring for more infos) + use of constants
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diff changeset
179 else:
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diff changeset
180 # the widget already exists
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diff changeset
181 if on_existing_widget == C.WIDGET_KEEP:
f079e6ed1e69 quick frontend(quick widgets): added the ability to use a callable with getOrCreateWidget's on_existing_widget
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diff changeset
182 pass
1309
d0d5ba3b4d64 quick frontend(quick widgets): fixed bad condition test in previous commit
Goffi <goffi@goffi.org>
parents: 1308
diff changeset
183 elif on_existing_widget == C.WIDGET_RAISE:
1301
afc57b34c0a3 Quick Frontend (quick_widgets): added on_existing_widget in getOrCreateWidget (see docstring for more infos) + use of constants
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diff changeset
184 raise WidgetAlreadyExistsError(hash_)
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diff changeset
185 elif on_existing_widget == C.WIDGET_RECREATE:
afc57b34c0a3 Quick Frontend (quick_widgets): added on_existing_widget in getOrCreateWidget (see docstring for more infos) + use of constants
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diff changeset
186 # we use getOrCreateWidget to recreate the new widget
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diff changeset
187 # /!\ we use args and kwargs and not _args and _kwargs because we need the original args
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diff changeset
188 # we need to get rid of kwargs special options
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diff changeset
189 new_kwargs = kwargs.copy()
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diff changeset
190 try:
afc57b34c0a3 Quick Frontend (quick_widgets): added on_existing_widget in getOrCreateWidget (see docstring for more infos) + use of constants
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diff changeset
191 new_kwargs.pop('force_hash') # FIXME: we use pop instead of del here because pyjamas doesn't raise error on del
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diff changeset
192 except KeyError:
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diff changeset
193 pass
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diff changeset
194 else:
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diff changeset
195 raise ValueError("force_hash option can't be used with on_existing_widget=RECREATE")
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196
1301
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diff changeset
197 # XXX: keep up-to-date if new special kwargs are added (i.e.: delete these keys here)
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diff changeset
198 new_kwargs['on_new_widget'] = None
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diff changeset
199 new_kwargs['on_existing_widget'] = C.WIDGET_RAISE
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diff changeset
200 hash_idx = 1
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parents: 1290
diff changeset
201 while True:
1310
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souliane <souliane@mailoo.org>
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diff changeset
202 new_kwargs['force_hash'] = "{}_new_instance_{}".format(hash_, hash_idx)
1301
afc57b34c0a3 Quick Frontend (quick_widgets): added on_existing_widget in getOrCreateWidget (see docstring for more infos) + use of constants
Goffi <goffi@goffi.org>
parents: 1290
diff changeset
203 try:
afc57b34c0a3 Quick Frontend (quick_widgets): added on_existing_widget in getOrCreateWidget (see docstring for more infos) + use of constants
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diff changeset
204 widget = self.getOrCreateWidget(class_, target, *args, **new_kwargs)
afc57b34c0a3 Quick Frontend (quick_widgets): added on_existing_widget in getOrCreateWidget (see docstring for more infos) + use of constants
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parents: 1290
diff changeset
205 except WidgetAlreadyExistsError:
afc57b34c0a3 Quick Frontend (quick_widgets): added on_existing_widget in getOrCreateWidget (see docstring for more infos) + use of constants
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diff changeset
206 hash_idx += 1
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parents: 1290
diff changeset
207 else:
afc57b34c0a3 Quick Frontend (quick_widgets): added on_existing_widget in getOrCreateWidget (see docstring for more infos) + use of constants
Goffi <goffi@goffi.org>
parents: 1290
diff changeset
208 log.debug(u"Widget already exists, a new one has been recreated with hash {}".format(new_kwargs['force_hash']))
afc57b34c0a3 Quick Frontend (quick_widgets): added on_existing_widget in getOrCreateWidget (see docstring for more infos) + use of constants
Goffi <goffi@goffi.org>
parents: 1290
diff changeset
209 break
1308
f079e6ed1e69 quick frontend(quick widgets): added the ability to use a callable with getOrCreateWidget's on_existing_widget
Goffi <goffi@goffi.org>
parents: 1307
diff changeset
210 elif callable(on_existing_widget):
1312
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souliane <souliane@mailoo.org>
parents: 1310
diff changeset
211 result = on_existing_widget(widget)
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souliane <souliane@mailoo.org>
parents: 1310
diff changeset
212 if isinstance(result, QuickWidget):
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souliane <souliane@mailoo.org>
parents: 1310
diff changeset
213 widget = result
1308
f079e6ed1e69 quick frontend(quick widgets): added the ability to use a callable with getOrCreateWidget's on_existing_widget
Goffi <goffi@goffi.org>
parents: 1307
diff changeset
214 else:
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215 raise exceptions.InternalError("Unexpected on_existing_widget value ({})".format(on_existing_widget))
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216
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217 return widget
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218
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219 def deleteWidget(self, widget_to_delete):
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220 """Delete a widget
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221
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222 widget's onDelete method will be called before deletion
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223 """
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224 widget_to_delete.onDelete()
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225
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226 for widget_map in self._widgets.itervalues():
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227 for hash_, widget in widget_map.iteritems():
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228 if widget_to_delete is widget:
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229 del widget_map[hash_]
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230
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231
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232 class QuickWidget(object):
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233 """generic widget base"""
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234 SINGLE=True # if True, there can be only one widget per target(s)
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235 PROFILES_MULTIPLE=False
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236 PROFILES_ALLOW_NONE=False
0
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237
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238 def __init__(self, host, target, profiles=None):
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239 """
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240 @param host: %(doc_host)s
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241 @param target: target specific for this widget class
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242 @param profiles: can be either:
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243 - (unicode): used when widget class manage a unique profile
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244 - (iterable): some widget class can manage several profiles, several at once can be specified here
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245 - None: no profile is managed by this widget class (rare)
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246 @raise: ValueError when (iterable) or None is given to profiles for a widget class which manage one unique profile.
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247 """
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248 self.host = host
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249 self.targets = set()
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250 self.addTarget(target)
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251 self.profiles = set()
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252 if isinstance(profiles, basestring):
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253 self.addProfile(profiles)
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254 elif profiles is None:
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255 if not self.PROFILES_ALLOW_NONE:
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256 raise ValueError("profiles can't have a value of None")
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257 else:
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258 if not self.PROFILES_MULTIPLE:
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259 raise ValueError("multiple profiles are not allowed")
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260 for profile in profiles:
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261 self.addProfile(profile)
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262
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263 @property
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264 def profile(self):
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265 assert len(self.profiles) == 1 and not self.PROFILES_MULTIPLE and not self.PROFILES_ALLOW_NONE
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266 return list(self.profiles)[0]
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267
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268 def addTarget(self, target):
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269 """Add a target if it doesn't already exists
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270
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271 @param target: target to add
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272 """
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273 self.targets.add(target)
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274
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275 def addProfile(self, profile):
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276 """Add a profile is if doesn't already exists
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277
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278 @param profile: profile to add
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279 """
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280 if self.profiles and not self.PROFILES_MULTIPLE:
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281 raise ValueError("multiple profiles are not allowed")
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282 self.profiles.add(profile)
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283
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284 @staticmethod
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285 def getWidgetHash(target, profiles):
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286 """Return the hash associated with this target for this widget class
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287
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288 some widget classes can manage several target on the same instance
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289 (e.g.: a chat widget with multiple resources on the same bare jid),
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290 this method allow to return a hash associated to one or several targets
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291 to retrieve the good instance. For example, a widget managing JID targets,
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292 and all resource of the same bare jid would return the bare jid as hash.
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293
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294 @param target: target to check
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295 @param profiles: profile(s) associated to target, see __init__ docstring
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296 @return: a hash (can correspond to one or many targets or profiles, depending of widget class)
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297 """
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298 return unicode(target) # by defaut, there is one hash for one target
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299
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300 def onDelete(self):
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301 """Called when a widget is deleted"""
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302 log.debug(u"deleting widget {}".format(self)) # Must be implemented by frontends