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annotate engine/extensions/pychan/tools.py @ 343:8e71629c4c43

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Several changes to layer, camera and map dialogs: * Renamed CameraEditor and LayerEditor to CameraDialog and LayerDialog * Moved CameraDialog and LayerDialog into their own modules in scripts.gui so other components can use them. * Prettier camera dialog * Added LayerDialog to map wizard
author cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
date Tue, 25 Aug 2009 01:21:00 +0000
parents 48c99636453e
children 7ea98190a75e
rev   line source
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48c99636453e Added Licence header to all pypthon modules in extension/
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1 #!/usr/bin/env python
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2 # -*- coding: utf-8 -*-
0
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3
331
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4 # ####################################################################
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5 # Copyright (C) 2005-2009 by the FIFE team
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6 # http://www.fifengine.de
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7 # This file is part of FIFE.
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8 #
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9 # FIFE is free software; you can redistribute it and/or
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10 # modify it under the terms of the GNU Lesser General Public
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11 # License as published by the Free Software Foundation; either
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12 # version 2.1 of the License, or (at your option) any later version.
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13 #
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14 # This library is distributed in the hope that it will be useful,
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15 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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16 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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17 # Lesser General Public License for more details.
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18 #
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19 # You should have received a copy of the GNU Lesser General Public
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20 # License along with this library; if not, write to the
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21 # Free Software Foundation, Inc.,
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22 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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23 # ####################################################################
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24
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25 """
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26 Functional utilities designed for pychan use cases.
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27 """
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28
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29 import exceptions
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30
0
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31 ### Functools ###
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32
205
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33 def applyOnlySuitable(func,*args,**kwargs):
0
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34 """
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35 This nifty little function takes another function and applies it to a dictionary of
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36 keyword arguments. If the supplied function does not expect one or more of the
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37 keyword arguments, these are silently discarded. The result of the application is returned.
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38 This is useful to pass information to callbacks without enforcing a particular signature.
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39 """
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40 if hasattr(func,'im_func'):
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41 code = func.im_func.func_code
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42 varnames = code.co_varnames[1:code.co_argcount]#ditch bound instance
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43 else:
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44 code = func.func_code
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45 varnames = code.co_varnames[0:code.co_argcount]
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46
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47 #http://docs.python.org/lib/inspect-types.html
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48 if code.co_flags & 8:
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49 return func(*args,**kwargs)
0
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50 for name,value in kwargs.items():
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51 if name not in varnames:
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52 del kwargs[name]
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53 return func(*args,**kwargs)
0
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54
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55 def callbackWithArguments(callback,*args,**kwargs):
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56 """
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57 Curries a function with extra arguments to
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58 create a suitable callback.
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59
0
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60 If you don't know what this means, don't worry.
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61 It is designed for the case where you need
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62 different buttons to execute basically the same code
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63 with different argumnets.
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64
0
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65 Usage::
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66 # The target callback
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67 def printStuff(text):
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68 print text
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69 # Mapping the events
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70 gui.mapEvents({
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71 'buttonHello' : callbackWithArguments(printStuff,"Hello"),
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72 'buttonBye' : callbackWithArguments(printStuff,"Adieu")
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73 })
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74 """
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75 def real_callback():
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76 callback(*args,**kwargs)
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77 return real_callback
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78
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79 def attrSetCallback(**kwargs):
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80 """
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81 Generates an event callback that sets attributes on the widget
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82 it is called on. This is especially useful for mouseEntered/Exited
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83 events - to create hover effects.
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84
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85 It takes a set of keyword arguments. The keys are treated as attribute names,
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86 which are then set to the corresponding value when the callback is called.
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87 Some key names are treated special - see below.
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88
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89 Usage - Example adapted from demo application::
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90 eventMap = {
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91 'creditsLink' : showCreditsCallback,
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92 'creditsLink/mouseEntered' : attrSetCallback(
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93 text = "Show credits!",
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94 background_color = (255,255,0,255),
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95 do__adaptLayout=True),
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96 'creditsLink/mouseExited' : attrSetCallback(text = "Credits"),
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97 gui.mapEvents(eventMap)
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98
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99 Now when the mouse enters the creditsLink (a Label in our case), the following code will be executed::
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100 #widget is the creditsLink - given to the event callback.
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101 widget.text = "Show credits!"
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102 widget.background_color = (255,255,0,255)
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103 widget.adaptLayout()
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104
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105 The C{do__adaptLayout} argument causes the method C{adaptLayout} to be called.
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106 In fact any key starting with C{do__} results in such a method call. The order
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107 of execution of such calls is undefined.
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108
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109 Keys starting with an underscore raise a L{execptions.PrivateFunctionalityError}.
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110 """
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111 do_calls = []
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112
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113 for name in kwargs.keys():
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114 if name.startswith("_"):
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115 raise exceptions.PrivateFunctionalityError(name)
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116 if name.startswith("do__"):
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117 do_calls.append(name[4:])
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118 del kwargs[name]
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119
205
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120 def attrSet_callback(widget=None):
163
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121 for name,value in kwargs.items():
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122 setattr(widget,name,value)
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123 for method_name in do_calls:
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124 method = getattr(widget,method_name)
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125 method()
205
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126 return attrSet_callback
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127
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128 def chainCallbacks(*args):
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129 """
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130 Chains callbacks to be called one after the other.
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131
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132 Example Usage::
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133 def print_event(event=0):
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134 print event
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135 def print_widget(widget=0):
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136 print widget
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137 callback = tools.chainCallbacks(doSomethingUseful, print_event, print_widget)
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138 guiElement.capture(callback)
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139 """
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140 callbacks = args
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141 def chain_callback(event=0,widget=0):
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142 for callback in callbacks:
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143 applyOnlySuitable(callback, event=event, widget=widget)
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144 return chain_callback
163
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145
330
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146 def repeatALot(n = 1000):
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147 """
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148 Internal decorator used to profile some pychan functions.
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149 Only use with functions without side-effect.
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150
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151 Usage::
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152 @repeatALot(n=10000)
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153 def findChild(self,**kwargs):
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154 ...
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155 """
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156 def wrap_f(f):
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157 def new_f(*args,**kwargs):
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158 for i in xrange(n):
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159 f(*args,**kwargs)
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160 return f(*args,**kwargs)
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161 return new_f
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162 return wrap_f
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163
0
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164 def this_is_deprecated(func,message=None):
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165 if message is None:
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166 message = repr(func)
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167 def wrapped_func(*args,**kwargs):
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168 print "PyChan: You are using the DEPRECATED functionality: %s" % message
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169 return func(*args,**kwargs)
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170 return wrapped_func