Mercurial > fife-parpg
annotate tools/editor/scripts/events/signal.py @ 697:ecaa4d98f05f tip
Abstracted the GUI code and refactored the GUIChan-specific code into its own module.
* Most of the GUIChan code has been refactored into its own gui/guichan module. However, references to the GuiFont class still persist in the Engine and GuiManager code and these will need further refactoring.
* GuiManager is now an abstract base class which specific implementations (e.g. GUIChan) should subclass.
* The GUIChan GUI code is now a concrete implementation of GuiManager, most of which is in the new GuiChanGuiManager class.
* The GUI code in the Console class has been refactored out of the Console and into the GUIChan module as its own GuiChanConsoleWidget class. The rest of the Console class related to executing commands was left largely unchanged.
* Existing client code may need to downcast the GuiManager pointer received from FIFE::Engine::getGuiManager() to GuiChanGuiManager, since not all functionality is represented in the GuiManager abstract base class. Python client code can use the new GuiChanGuiManager.castTo static method for this purpose.
author | M. George Hansen <technopolitica@gmail.com> |
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date | Sat, 18 Jun 2011 00:28:40 -1000 |
parents | d819a70949d2 |
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rev | line source |
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1 # -*- coding: utf-8 -*- |
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2 |
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3 # Copyright (c) Django Software Foundation and individual contributors. |
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4 # All rights reserved. |
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5 # |
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6 # Redistribution and use in source and binary forms, with or without modification, |
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7 # are permitted provided that the following conditions are met: |
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8 # |
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9 # 1. Redistributions of source code must retain the above copyright notice, |
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10 # this list of conditions and the following disclaimer. |
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11 # |
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12 # 2. Redistributions in binary form must reproduce the above copyright |
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13 # notice, this list of conditions and the following disclaimer in the |
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14 # documentation and/or other materials provided with the distribution. |
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15 # |
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16 # 3. Neither the name of Django nor the names of its contributors may be used |
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17 # to endorse or promote products derived from this software without |
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18 # specific prior written permission. |
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19 # |
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20 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND |
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21 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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22 # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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23 # DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR |
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24 # ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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25 # (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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26 # LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON |
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27 # ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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28 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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29 # SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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30 |
378
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31 """Multi-consumer multi-producer dispatching mechanism |
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32 |
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33 Originally based on pydispatch (BSD) http://pypi.python.org/pypi/PyDispatcher/2.0.1 |
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34 See license.txt for original license. |
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35 |
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36 Heavily modified for Django's purposes. |
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37 |
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38 Copied from django v1.1 beta 1 |
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39 Changes: |
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40 * Receivers aren't needed to accept any arguments |
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41 * _live_receivers() now work on a copy of self.receivers, which fixes a bug when |
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42 connecting and disconnecting during send() |
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43 """ |
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44 |
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45 import weakref |
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46 import saferef |
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47 from fife.extensions import pychan |
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48 |
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49 WEAKREF_TYPES = (weakref.ReferenceType, saferef.BoundMethodWeakref) |
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50 |
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51 debug = True |
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52 |
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53 def _make_id(target): |
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54 if hasattr(target, 'im_func'): |
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55 return (id(target.im_self), id(target.im_func)) |
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56 return id(target) |
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57 |
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58 class Signal(object): |
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59 """Base class for all signals |
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60 |
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61 Internal attributes: |
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62 receivers -- { receriverkey (id) : weakref(receiver) } |
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63 """ |
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64 |
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65 def __init__(self, providing_args=None): |
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66 """providing_args -- A list of the arguments this signal can pass along in |
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67 a send() call. |
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68 """ |
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69 self.receivers = [] |
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70 if providing_args is None: |
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71 providing_args = [] |
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72 self.providing_args = set(providing_args) |
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73 |
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74 def connect(self, receiver, sender=None, weak=True, dispatch_uid=None): |
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75 """Connect receiver to sender for signal |
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76 |
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77 receiver -- a function or an instance method which is to |
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78 receive signals. Receivers must be |
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79 hashable objects. |
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80 |
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81 if weak is True, then receiver must be weak-referencable |
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82 (more precisely saferef.safeRef() must be able to create |
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83 a reference to the receiver). |
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84 |
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85 Receivers must be able to accept keyword arguments. |
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86 |
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87 If receivers have a dispatch_uid attribute, the receiver will |
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88 not be added if another receiver already exists with that |
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89 dispatch_uid. |
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90 |
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91 sender -- the sender to which the receiver should respond |
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92 Must either be of type Signal, or None to receive events |
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93 from any sender. |
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94 |
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95 weak -- whether to use weak references to the receiver |
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96 By default, the module will attempt to use weak |
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97 references to the receiver objects. If this parameter |
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98 is false, then strong references will be used. |
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99 |
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100 dispatch_uid -- an identifier used to uniquely identify a particular |
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101 instance of a receiver. This will usually be a string, though it |
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102 may be anything hashable. |
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103 |
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104 returns None |
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105 """ |
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106 |
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107 # If DEBUG is on, check that we got a good receiver |
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108 if debug: |
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109 import inspect |
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110 assert callable(receiver), "Signal receivers must be callable." |
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111 |
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112 # Check for **kwargs |
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113 # Not all callables are inspectable with getargspec, so we'll |
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114 # try a couple different ways but in the end fall back on assuming |
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115 # it is -- we don't want to prevent registration of valid but weird |
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116 # callables. |
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117 try: |
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118 argspec = inspect.getargspec(receiver) |
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119 except TypeError: |
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120 try: |
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121 argspec = inspect.getargspec(receiver.__call__) |
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122 except (TypeError, AttributeError): |
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123 argspec = None |
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124 |
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125 if dispatch_uid: |
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126 lookup_key = (dispatch_uid, _make_id(sender)) |
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127 else: |
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128 lookup_key = (_make_id(receiver), _make_id(sender)) |
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129 |
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130 if weak: |
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131 receiver = saferef.safeRef(receiver, onDelete=self._remove_receiver) |
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132 |
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133 for r_key, _ in self.receivers: |
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134 if r_key == lookup_key: |
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135 break |
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136 else: |
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137 self.receivers.append((lookup_key, receiver)) |
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138 |
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139 def disconnect(self, receiver=None, sender=None, weak=True, dispatch_uid=None): |
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140 """Disconnect receiver from sender for signal |
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141 |
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142 receiver -- the registered receiver to disconnect. May be none if |
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143 dispatch_uid is specified. |
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144 sender -- the registered sender to disconnect |
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145 weak -- the weakref state to disconnect |
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146 dispatch_uid -- the unique identifier of the receiver to disconnect |
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147 |
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148 disconnect reverses the process of connect. |
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149 |
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150 If weak references are used, disconnect need not be called. |
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151 The receiver will be remove from dispatch automatically. |
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152 |
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153 returns None |
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154 """ |
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155 |
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156 if dispatch_uid: |
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157 lookup_key = (dispatch_uid, _make_id(sender)) |
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158 else: |
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159 lookup_key = (_make_id(receiver), _make_id(sender)) |
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160 |
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161 for idx, (r_key, _) in enumerate(self.receivers): |
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162 if r_key == lookup_key: |
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163 del self.receivers[idx] |
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164 |
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165 def send(self, sender, **named): |
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166 """Send signal from sender to all connected receivers. |
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167 |
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168 sender -- the sender of the signal |
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169 Either a specific object or None. |
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170 |
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171 named -- named arguments which will be passed to receivers. |
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172 |
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173 Returns a list of tuple pairs [(receiver, response), ... ]. |
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174 |
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175 If any receiver raises an error, the error propagates back |
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176 through send, terminating the dispatch loop, so it is quite |
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177 possible to not have all receivers called if a raises an |
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178 error. |
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179 """ |
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180 |
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181 responses = [] |
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182 if not self.receivers: |
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183 return responses |
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184 |
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185 for receiver in self._live_receivers(_make_id(sender)): |
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186 response = pychan.tools.applyOnlySuitable(receiver, signal=self, sender=sender, **named) |
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187 responses.append((receiver, response)) |
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188 return responses |
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189 |
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190 def send_robust(self, sender, **named): |
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191 """Send signal from sender to all connected receivers catching errors |
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192 |
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193 sender -- the sender of the signal |
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194 Can be any python object (normally one registered with |
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195 a connect if you actually want something to occur). |
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196 |
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197 named -- named arguments which will be passed to receivers. |
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198 These arguments must be a subset of the argument names |
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199 defined in providing_args. |
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200 |
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201 Return a list of tuple pairs [(receiver, response), ... ], |
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202 may raise DispatcherKeyError |
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203 |
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204 if any receiver raises an error (specifically any subclass of Exception), |
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205 the error instance is returned as the result for that receiver. |
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206 """ |
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207 |
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208 responses = [] |
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209 if not self.receivers: |
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210 return responses |
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211 |
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212 # Call each receiver with whatever arguments it can accept. |
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213 # Return a list of tuple pairs [(receiver, response), ... ]. |
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214 for receiver in self._live_receivers(_make_id(sender)): |
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215 try: |
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216 response = pychan.tools.applyOnlySuitable(receiver, signal=self, sender=sender, **named) |
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217 except Exception, err: |
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218 responses.append((receiver, err)) |
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219 else: |
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220 responses.append((receiver, response)) |
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221 return responses |
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222 |
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223 def _live_receivers(self, senderkey): |
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224 """Filter sequence of receivers to get resolved, live receivers |
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225 |
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226 This checks for weak references |
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227 and resolves them, then returning only live |
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228 receivers. |
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229 """ |
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230 none_senderkey = _make_id(None) |
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231 |
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232 for (receiverkey, r_senderkey), receiver in self.receivers[:]: |
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233 if r_senderkey == none_senderkey or r_senderkey == senderkey: |
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234 if isinstance(receiver, WEAKREF_TYPES): |
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235 # Dereference the weak reference. |
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236 receiver = receiver() |
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237 if receiver is not None: |
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238 yield receiver |
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239 else: |
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240 yield receiver |
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241 |
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242 def _remove_receiver(self, receiver): |
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243 """Remove dead receivers from connections.""" |
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244 |
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245 to_remove = [] |
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246 for key, connected_receiver in self.receivers: |
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247 if connected_receiver == receiver: |
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248 to_remove.append(key) |
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249 for key in to_remove: |
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250 for idx, (r_key, _) in enumerate(self.receivers): |
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251 if r_key == key: |
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252 del self.receivers[idx] |