Mercurial > fife-parpg

annotate engine/extensions/pychan/tools.py @ 253:6ab09eb765a1

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* Added patch by MadMonk that exposes the guichan focus functions to pychan * Thanks for contributing
author nihathrael@33b003aa-7bff-0310-803a-e67f0ece8222
date Fri, 08 May 2009 08:45:27 +0000
parents 54bfd1015b35
children 33dd55160a9d
rev   line source
0
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1 # coding: utf-8
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2
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3 """
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4 Functional utilities designed for pychan use cases.
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5 """
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6
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7 import exceptions
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8
0
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9 ### Functools ###
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10
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11 def applyOnlySuitable(func,*args,**kwargs):
0
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12 """
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13 This nifty little function takes another function and applies it to a dictionary of
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14 keyword arguments. If the supplied function does not expect one or more of the
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15 keyword arguments, these are silently discarded. The result of the application is returned.
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16 This is useful to pass information to callbacks without enforcing a particular signature.
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17 """
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18 if hasattr(func,'im_func'):
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19 code = func.im_func.func_code
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20 varnames = code.co_varnames[1:code.co_argcount]#ditch bound instance
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21 else:
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22 code = func.func_code
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23 varnames = code.co_varnames[0:code.co_argcount]
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24
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25 #http://docs.python.org/lib/inspect-types.html
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26 if code.co_flags & 8:
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27 return func(*args,**kwargs)
0
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28 for name,value in kwargs.items():
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29 if name not in varnames:
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30 del kwargs[name]
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31 return func(*args,**kwargs)
0
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32
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33 def callbackWithArguments(callback,*args,**kwargs):
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34 """
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35 Curries a function with extra arguments to
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36 create a suitable callback.
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37
0
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38 If you don't know what this means, don't worry.
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39 It is designed for the case where you need
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40 different buttons to execute basically the same code
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41 with different argumnets.
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42
0
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43 Usage::
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44 # The target callback
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45 def printStuff(text):
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46 print text
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47 # Mapping the events
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48 gui.mapEvents({
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49 'buttonHello' : callbackWithArguments(printStuff,"Hello"),
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50 'buttonBye' : callbackWithArguments(printStuff,"Adieu")
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51 })
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52 """
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53 def real_callback():
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54 callback(*args,**kwargs)
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55 return real_callback
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56
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57 def attrSetCallback(**kwargs):
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58 """
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59 Generates an event callback that sets attributes on the widget
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60 it is called on. This is especially useful for mouseEntered/Exited
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61 events - to create hover effects.
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62
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63 It takes a set of keyword arguments. The keys are treated as attribute names,
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64 which are then set to the corresponding value when the callback is called.
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65 Some key names are treated special - see below.
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66
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67 Usage - Example adapted from demo application::
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68 eventMap = {
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69 'creditsLink' : showCreditsCallback,
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70 'creditsLink/mouseEntered' : attrSetCallback(
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71 text = "Show credits!",
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72 background_color = (255,255,0,255),
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73 do__adaptLayout=True),
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74 'creditsLink/mouseExited' : attrSetCallback(text = "Credits"),
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75 gui.mapEvents(eventMap)
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76
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77 Now when the mouse enters the creditsLink (a Label in our case), the following code will be executed::
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78 #widget is the creditsLink - given to the event callback.
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79 widget.text = "Show credits!"
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80 widget.background_color = (255,255,0,255)
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81 widget.adaptLayout()
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82
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83 The C{do__adaptLayout} argument causes the method C{adaptLayout} to be called.
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84 In fact any key starting with C{do__} results in such a method call. The order
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85 of execution of such calls is undefined.
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86
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87 Keys starting with an underscore raise a L{execptions.PrivateFunctionalityError}.
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88 """
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89 do_calls = []
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90
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91 for name in kwargs.keys():
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92 if name.startswith("_"):
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93 raise exceptions.PrivateFunctionalityError(name)
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94 if name.startswith("do__"):
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95 do_calls.append(name[4:])
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96 del kwargs[name]
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97
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98 def attrSet_callback(widget=None):
163
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99 for name,value in kwargs.items():
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100 setattr(widget,name,value)
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101 for method_name in do_calls:
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102 method = getattr(widget,method_name)
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103 method()
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104 return attrSet_callback
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105
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106 def chainCallbacks(*args):
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107 """
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108 Chains callbacks to be called one after the other.
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109
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110 Example Usage::
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111 def print_event(event=0):
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112 print event
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113 def print_widget(widget=0):
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114 print widget
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115 callback = tools.chainCallbacks(doSomethingUseful, print_event, print_widget)
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116 guiElement.capture(callback)
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117 """
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118 callbacks = args
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119 def chain_callback(event=0,widget=0):
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120 for callback in callbacks:
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121 applyOnlySuitable(callback, event=event, widget=widget)
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122 return chain_callback
163
31718fa356f8 Backported the attrSetCallback from pychan_rework.
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123
0
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124 def this_is_deprecated(func,message=None):
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125 if message is None:
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126 message = repr(func)
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127 def wrapped_func(*args,**kwargs):
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128 print "PyChan: You are using the DEPRECATED functionality: %s" % message
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129 return func(*args,**kwargs)
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130 return wrapped_func