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annotate frontends/src/quick_frontend/quick_widgets.py @ 1308:f079e6ed1e69 frontends_multi_profiles

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quick frontend(quick widgets): added the ability to use a callable with getOrCreateWidget's on_existing_widget
author Goffi <goffi@goffi.org>
date Fri, 06 Feb 2015 20:43:28 +0100
parents 9512590dc3d7
children d0d5ba3b4d64
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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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23
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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(list): optional kwargs to create anew 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 None: do nothing
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110 if 'on_existing_widget' is present it can have the following values:
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111 C.WIDGET_KEEP [default]: return the existing widget
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diff changeset
112 C.WIDGET_RAISE: raise WidgetAlreadyExistsError
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parents: 1290
diff changeset
113 C.WIDGET_RECREATE: create a new widget *WITH A NEW HASH*
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114 [callable]: this method will be called with existing widget as argument
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diff changeset
115 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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9512590dc3d7 quick_ frontend (quick widgets): added explanation in docstring for non special keywords in getOrCreateWidget
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parents: 1304
diff changeset
116 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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diff changeset
117 it will be used to create a new QuickChat instance).
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118 @return: a class_ instance, either new or already existing
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diff changeset
119 """
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120 cls = self.getRealClass(class_)
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diff changeset
121
1301
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122 ## arguments management ##
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123 _args = [self.host, target] + list(args) or [] # FIXME: check if it's really necessary to use optional args
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diff changeset
124 _kwargs = kwargs or {}
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diff changeset
125 if 'profiles' in _kwargs and 'profile' in _kwargs:
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126 raise ValueError("You can't have 'profile' and 'profiles' keys at the same time")
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diff changeset
127 try:
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128 _kwargs['profiles'] = _kwargs.pop('profile')
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129 except KeyError:
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130 if not 'profiles' in _kwargs:
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131 _kwargs['profiles'] = None
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132
1301
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diff changeset
133 #on_new_widget tell what to do for the new widget creation
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134 try:
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135 on_new_widget = _kwargs.pop('on_new_widget')
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136 except KeyError:
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137 on_new_widget = C.WIDGET_NEW
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138
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139 #on_existing_widget tell what to do when the widget already exists
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diff changeset
140 try:
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141 on_existing_widget = _kwargs.pop('on_existing_widget')
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142 except KeyError:
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143 on_existing_widget = C.WIDGET_KEEP
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144
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145 ## we get the hash ##
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146 try:
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diff changeset
147 hash_ = _kwargs.pop('force_hash')
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148 except KeyError:
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parents: 1139
diff changeset
149 hash_ = cls.getWidgetHash(target, _kwargs['profiles'])
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150
1304
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151 ## widget creation or retrieval ##
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diff changeset
152
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)
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153 widgets_map = self._widgets.setdefault(cls.__name__, {}) # we sorts widgets by classes
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154 if not cls.SINGLE:
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155 widget = None # if the class is not SINGLE, we always create a new widget
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156 else:
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diff changeset
157 try:
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158 widget = widgets_map[hash_]
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159 widget.addTarget(target)
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160 except KeyError:
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diff changeset
161 widget = None
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diff changeset
162
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diff changeset
163 if widget is None:
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164 # we need to create a new widget
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165 log.debug(u"Creating new widget for target {} {}".format(target, cls))
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166 widget = cls(*_args, **_kwargs)
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167 widgets_map[hash_] = widget
0
goffi@necton2
parents:
diff changeset
168
1301
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diff changeset
169 if on_new_widget == C.WIDGET_NEW:
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170 self.host.newWidget(widget)
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diff changeset
171 elif callable(on_new_widget):
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diff changeset
172 on_new_widget(widget)
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173 else:
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diff changeset
174 assert on_new_widget is None
1301
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diff changeset
175 else:
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176 # the widget already exists
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177 if on_existing_widget == C.WIDGET_KEEP:
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diff changeset
178 pass
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 if on_existing_widget == C.WIDGET_RAISE:
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diff changeset
180 raise WidgetAlreadyExistsError(hash_)
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diff changeset
181 elif on_existing_widget == C.WIDGET_RECREATE:
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182 # we use getOrCreateWidget to recreate the new widget
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183 # /!\ we use args and kwargs and not _args and _kwargs because we need the original args
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diff changeset
184 # we need to get rid of kwargs special options
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diff changeset
185 new_kwargs = kwargs.copy()
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diff changeset
186 try:
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diff changeset
187 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
188 except KeyError:
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diff changeset
189 pass
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diff changeset
190 else:
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diff changeset
191 raise ValueError("force_hash option can't be used with on_existing_widget=RECREATE")
1265
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192
1301
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diff changeset
193 # XXX: keep up-to-date if new special kwargs are added (i.e.: delete these keys here)
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diff changeset
194 new_kwargs['on_new_widget'] = None
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diff changeset
195 new_kwargs['on_existing_widget'] = C.WIDGET_RAISE
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diff changeset
196 hash_idx = 1
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diff changeset
197 while True:
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diff changeset
198 new_kwargs['force_hash'] = hash_ + "_new_instance_{}".format(hash_idx)
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diff changeset
199 try:
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diff changeset
200 widget = self.getOrCreateWidget(class_, target, *args, **new_kwargs)
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diff changeset
201 except WidgetAlreadyExistsError:
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diff changeset
202 hash_idx += 1
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diff changeset
203 else:
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diff changeset
204 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
205 break
1308
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diff changeset
206 elif callable(on_existing_widget):
f079e6ed1e69 quick frontend(quick widgets): added the ability to use a callable with getOrCreateWidget's on_existing_widget
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diff changeset
207 on_existing_widget(widget)
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diff changeset
208 else:
f079e6ed1e69 quick frontend(quick widgets): added the ability to use a callable with getOrCreateWidget's on_existing_widget
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parents: 1307
diff changeset
209 raise exceptions.InternalError("Unexpected on_existing_widget value ({})".format(on_existing_widget))
f079e6ed1e69 quick frontend(quick widgets): added the ability to use a callable with getOrCreateWidget's on_existing_widget
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parents: 1307
diff changeset
210
1265
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diff changeset
211 return widget
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diff changeset
212
1303
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213 def deleteWidget(self, widget_to_delete):
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214 """Delete a widget
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215
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216 widget's onDelete method will be called before deletion
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217 """
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218 widget_to_delete.onDelete()
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219
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220 for widget_map in self._widgets.itervalues():
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221 for hash_, widget in widget_map.iteritems():
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222 if widget_to_delete is widget:
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223 del widget_map[hash_]
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224
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225
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226 class QuickWidget(object):
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227 """generic widget base"""
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228 SINGLE=True # if True, there can be only one widget per target(s)
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229 PROFILES_MULTIPLE=False
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230 PROFILES_ALLOW_NONE=False
0
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231
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232 def __init__(self, host, target, profiles=None):
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233 """
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234 @param host: %(doc_host)s
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235 @param target: target specific for this widget class
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236 @param profiles: can be either:
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237 - (unicode): used when widget class manage a unique profile
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238 - (iterable): some widget class can manage several profiles, several at once can be specified here
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239 - None: no profile is managed by this widget class (rare)
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240 @raise: ValueError when (iterable) or None is given to profiles for a widget class which manage one unique profile.
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241 """
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242 self.host = host
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243 self.targets = set()
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244 self.addTarget(target)
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245 self.profiles = set()
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246 if isinstance(profiles, basestring):
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247 self.addProfile(profiles)
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248 elif profiles is None:
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249 if not self.PROFILES_ALLOW_NONE:
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250 raise ValueError("profiles can't have a value of None")
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251 else:
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252 if not self.PROFILES_MULTIPLE:
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253 raise ValueError("multiple profiles are not allowed")
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254 for profile in profiles:
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255 self.addProfile(profile)
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256
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257 @property
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258 def profile(self):
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259 assert len(self.profiles) == 1 and not self.PROFILES_MULTIPLE and not self.PROFILES_ALLOW_NONE
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260 return list(self.profiles)[0]
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261
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262 def addTarget(self, target):
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263 """Add a target if it doesn't already exists
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264
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265 @param target: target to add
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266 """
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267 self.targets.add(target)
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268
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269 def addProfile(self, profile):
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270 """Add a profile is if doesn't already exists
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271
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272 @param profile: profile to add
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273 """
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274 if self.profiles and not self.PROFILES_MULTIPLE:
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275 raise ValueError("multiple profiles are not allowed")
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276 self.profiles.add(profile)
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277
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278 @staticmethod
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279 def getWidgetHash(target, profiles):
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280 """Return the hash associated with this target for this widget class
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281
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282 some widget classes can manage several target on the same instance
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283 (e.g.: a chat widget with multiple resources on the same bare jid),
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284 this method allow to return a hash associated to one or several targets
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285 to retrieve the good instance. For example, a widget managing JID targets,
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286 and all resource of the same bare jid would return the bare jid as hash.
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287
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288 @param target: target to check
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289 @param profiles: profile(s) associated to target, see __init__ docstring
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290 @return: a hash (can correspond to one or many targets or profiles, depending of widget class)
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291 """
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292 return unicode(target) # by defaut, there is one hash for one target
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293
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294 def onDelete(self):
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295 """Called when a widget is deleted"""
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296 log.debug(u"deleting widget {}".format(self)) # Must be implemented by frontends