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annotate frontends/src/quick_frontend/quick_widgets.py @ 1301:afc57b34c0a3 frontends_multi_profiles

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Quick Frontend (quick_widgets): added on_existing_widget in getOrCreateWidget (see docstring for more infos) + use of constants
author Goffi <goffi@goffi.org>
date Fri, 06 Feb 2015 19:01:06 +0100
parents faa1129559b8
children d3ef3894254d
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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 classes_map[base_cls] = child_cls
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44 class WidgetAlreadyExistsError(Exception):
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45 pass
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48 class QuickWidgetsManager(object):
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49 """This class is used to manage all the widgets of a frontend
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50 A widget can be a window, a graphical thing, or someting else depending of the frontend"""
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51
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52 def __init__(self, host):
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53 self.host = host
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54 self._widgets = {}
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55
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56 def __iter__(self):
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57 """Iterate throught all widgets"""
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58 for widget_map in self._widgets.itervalues():
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59 for widget in widget_map.itervalues():
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60 yield widget
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61
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62 def getRealClass(self, class_):
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63 """Return class registered for given class_
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64
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65 @param class_: subclass of QuickWidget
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66 @return: class actually used to create widget
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67 """
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68 try:
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69 cls = classes_map[class_]
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70 except KeyError:
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71 cls = class_
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72 if cls is None:
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73 raise exceptions.InternalError("There is not class registered for {}".format(class_))
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74 return cls
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75
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76 def getWidgets(self, class_):
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77 """Get all subclassed widgets
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78
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79 @param class_: subclass of QuickWidget, same parameter as used in [getOrCreateWidget]
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80 @return: iterator on widgets
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81 """
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82 class_ = self.getRealClass(class_)
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83 try:
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84 widgets_map = self._widgets[class_]
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85 except KeyError:
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86 return iter([])
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87 else:
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88 return widgets_map.itervalues()
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89
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90 def getOrCreateWidget(self, class_, target, *args, **kwargs):
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91 """Get an existing widget or create a new one when necessary
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92
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93 If the widget is new, self.host.newWidget will be called with it.
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94 @param class_(class): class of the widget to create
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95 @param target: target depending of the widget, usually a JID instance
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96 @param args(list): optional args to create a new instance of class_
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97 @param kwargs(list): optional kwargs to create anew instance of class_
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98 if 'profile' key is present, it will be popped and put in 'profiles'
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99 if there is neither 'profile' nor 'profiles', None will be used for 'profiles'
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100 if 'on_new_widget' is present it can have the following values:
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101 C.WIDGET_NEW [default]: self.host.newWidget will be called on widget creation
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102 [callable]: this method will be called instead of self.host.newWidget
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103 None: do nothing
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104 if 'on_existing_widget' is present it can have the following values:
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105 C.WIDGET_KEEP [default]: return the existing widget
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106 C.WIDGET_RAISE: raise WidgetAlreadyExistsError
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107 C.WIDGET_RECREATE: create a new widget *WITH A NEW HASH*
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108 if 'force_hash' is present, the hash given in value will be used instead of the one returned by class_.getWidgetHash
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109 @return: a class_ instance, either new or already existing
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110 """
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111 cls = self.getRealClass(class_)
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112
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113 ## arguments management ##
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114 _args = [self.host, target] + list(args) or [] # FIXME: check if it's really necessary to use optional args
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115 _kwargs = kwargs or {}
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diff changeset
116 if 'profiles' in _kwargs and 'profile' in _kwargs:
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diff changeset
117 raise ValueError("You can't have 'profile' and 'profiles' keys at the same time")
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diff changeset
118 try:
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parents: 1139
diff changeset
119 _kwargs['profiles'] = _kwargs.pop('profile')
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diff changeset
120 except KeyError:
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Goffi <goffi@goffi.org>
parents: 1139
diff changeset
121 if not 'profiles' in _kwargs:
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diff changeset
122 _kwargs['profiles'] = None
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parents: 1139
diff changeset
123
1301
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diff changeset
124 #on_new_widget tell what to do for the new widget creation
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diff changeset
125 try:
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
126 on_new_widget = _kwargs.pop('on_new_widget')
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127 except KeyError:
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diff changeset
128 on_new_widget = C.WIDGET_NEW
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129
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diff changeset
130 #on_existing_widget tell what to do when the widget already exists
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diff changeset
131 try:
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132 on_existing_widget = _kwargs.pop('on_existing_widget')
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133 except KeyError:
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134 on_existing_widget = C.WIDGET_KEEP
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diff changeset
135
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diff changeset
136 ## we get the hash ##
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diff changeset
137 try:
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diff changeset
138 hash_ = _kwargs.pop('force_hash')
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diff changeset
139 except KeyError:
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parents: 1139
diff changeset
140 hash_ = cls.getWidgetHash(target, _kwargs['profiles'])
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diff changeset
141
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142 # widget creation or retrieval
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143 widgets_map = self._widgets.setdefault(cls, {}) # we sorts widgets by classes
1265
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144 if not cls.SINGLE:
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diff changeset
145 widget = None # if the class is not SINGLE, we always create a new widget
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146 else:
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diff changeset
147 try:
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diff changeset
148 widget = widgets_map[hash_]
1265
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diff changeset
149 widget.addTarget(target)
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diff changeset
150 except KeyError:
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diff changeset
151 widget = None
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diff changeset
152
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diff changeset
153 if widget is None:
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diff changeset
154 # we need to create a new widget
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diff changeset
155 log.debug(u"Creating new widget for target {} {}".format(target, cls))
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diff changeset
156 widget = cls(*_args, **_kwargs)
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diff changeset
157 widgets_map[hash_] = widget
0
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parents:
diff changeset
158
1301
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diff changeset
159 if on_new_widget == C.WIDGET_NEW:
1265
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diff changeset
160 self.host.newWidget(widget)
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diff changeset
161 elif callable(on_new_widget):
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diff changeset
162 on_new_widget(widget)
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diff changeset
163 else:
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diff changeset
164 assert on_new_widget is None
1301
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diff changeset
165 else:
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diff changeset
166 # the widget already exists
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diff changeset
167 if on_existing_widget == C.WIDGET_RAISE:
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
168 raise WidgetAlreadyExistsError(hash_)
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diff changeset
169 elif on_existing_widget == C.WIDGET_RECREATE:
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170 # we use getOrCreateWidget to recreate the new widget
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diff changeset
171 # /!\ we use args and kwargs and not _args and _kwargs because we need the original args
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diff changeset
172 # we need to get rid of kwargs special options
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diff changeset
173 new_kwargs = kwargs.copy()
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diff changeset
174 try:
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diff changeset
175 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
176 except KeyError:
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diff changeset
177 pass
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diff changeset
178 else:
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diff changeset
179 raise ValueError("force_hash option can't be used with on_existing_widget=RECREATE")
1265
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180
1301
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diff changeset
181 # XXX: keep up-to-date if new special kwargs are added (i.e.: delete these keys here)
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diff changeset
182 new_kwargs['on_new_widget'] = None
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diff changeset
183 new_kwargs['on_existing_widget'] = C.WIDGET_RAISE
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diff changeset
184 hash_idx = 1
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
185 while True:
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 new_kwargs['force_hash'] = hash_ + "_new_instance_{}".format(hash_idx)
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
187 try:
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diff changeset
188 widget = self.getOrCreateWidget(class_, target, *args, **new_kwargs)
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diff changeset
189 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
190 hash_idx += 1
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diff changeset
191 else:
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diff changeset
192 log.debug(u"Widget already exists, a new one has been recreated with hash {}".format(new_kwargs['force_hash']))
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diff changeset
193 break
1265
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diff changeset
194 return widget
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diff changeset
195
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diff changeset
196
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diff changeset
197 class QuickWidget(object):
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diff changeset
198 """generic widget base"""
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diff changeset
199 SINGLE=True # if True, there can be only one widget per target(s)
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diff changeset
200 PROFILES_MULTIPLE=False
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diff changeset
201 PROFILES_ALLOW_NONE=False
0
goffi@necton2
parents:
diff changeset
202
1265
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diff changeset
203 def __init__(self, host, target, profiles=None):
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diff changeset
204 """
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diff changeset
205 @param host: %(doc_host)s
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diff changeset
206 @param target: target specific for this widget class
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diff changeset
207 @param profiles: can be either:
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diff changeset
208 - (unicode): used when widget class manage a unique profile
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diff changeset
209 - (iterable): some widget class can manage several profiles, several at once can be specified here
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diff changeset
210 - None: no profile is managed by this widget class (rare)
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diff changeset
211 @raise: ValueError when (iterable) or None is given to profiles for a widget class which manage one unique profile.
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diff changeset
212 """
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diff changeset
213 self.host = host
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diff changeset
214 self.targets = set()
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diff changeset
215 self.addTarget(target)
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diff changeset
216 self.profiles = set()
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diff changeset
217 if isinstance(profiles, basestring):
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diff changeset
218 self.addProfile(profiles)
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diff changeset
219 elif profiles is None:
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220 if not self.PROFILES_ALLOW_NONE:
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221 raise ValueError("profiles can't have a value of None")
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222 else:
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223 if not self.PROFILES_MULTIPLE:
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224 raise ValueError("multiple profiles are not allowed")
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225 for profile in profiles:
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226 self.addProfile(profile)
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227
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228 @property
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229 def profile(self):
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230 assert len(self.profiles) == 1 and not self.PROFILES_MULTIPLE and not self.PROFILES_ALLOW_NONE
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231 return list(self.profiles)[0]
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232
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233 def addTarget(self, target):
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234 """Add a target if it doesn't already exists
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235
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236 @param target: target to add
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237 """
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238 self.targets.add(target)
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239
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240 def addProfile(self, profile):
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241 """Add a profile is if doesn't already exists
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242
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243 @param profile: profile to add
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244 """
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245 if self.profiles and not self.PROFILES_MULTIPLE:
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246 raise ValueError("multiple profiles are not allowed")
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247 self.profiles.add(profile)
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248
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249 @staticmethod
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250 def getWidgetHash(target, profiles):
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251 """Return the hash associated with this target for this widget class
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252
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253 some widget classes can manage several target on the same instance
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254 (e.g.: a chat widget with multiple resources on the same bare jid),
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255 this method allow to return a hash associated to one or several targets
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256 to retrieve the good instance. For example, a widget managing JID targets,
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257 and all resource of the same bare jid would return the bare jid as hash.
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258
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259 @param target: target to check
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260 @param profiles: profile(s) associated to target, see __init__ docstring
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261 @return: a hash (can correspond to one or many targets or profiles, depending of widget class)
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262 """
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263 return unicode(target) # by defaut, there is one hash for one target