Mercurial > cpython-lru_cache-weakref

annotate Lib/idlelib/MultiCall.py @ 78069:a8aa77458e12 3.2

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Add c_size_t and c_ssize_t to the ctypes summary table.
author Antoine Pitrou <solipsis@pitrou.net>
date Thu, 12 Jul 2012 20:31:50 +0200
parents 7fa8b7a2f50a
children 61092bbd1464
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1 """
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2 MultiCall - a class which inherits its methods from a Tkinter widget (Text, for
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3 example), but enables multiple calls of functions per virtual event - all
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4 matching events will be called, not only the most specific one. This is done
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5 by wrapping the event functions - event_add, event_delete and event_info.
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6 MultiCall recognizes only a subset of legal event sequences. Sequences which
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7 are not recognized are treated by the original Tk handling mechanism. A
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8 more-specific event will be called before a less-specific event.
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9
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10 The recognized sequences are complete one-event sequences (no emacs-style
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11 Ctrl-X Ctrl-C, no shortcuts like <3>), for all types of events.
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12 Key/Button Press/Release events can have modifiers.
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13 The recognized modifiers are Shift, Control, Option and Command for Mac, and
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14 Control, Alt, Shift, Meta/M for other platforms.
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15
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16 For all events which were handled by MultiCall, a new member is added to the
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17 event instance passed to the binded functions - mc_type. This is one of the
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18 event type constants defined in this module (such as MC_KEYPRESS).
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19 For Key/Button events (which are handled by MultiCall and may receive
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20 modifiers), another member is added - mc_state. This member gives the state
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21 of the recognized modifiers, as a combination of the modifier constants
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22 also defined in this module (for example, MC_SHIFT).
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23 Using these members is absolutely portable.
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24
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25 The order by which events are called is defined by these rules:
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26 1. A more-specific event will be called before a less-specific event.
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27 2. A recently-binded event will be called before a previously-binded event,
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28 unless this conflicts with the first rule.
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29 Each function will be called at most once for each event.
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30 """
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31
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32 import sys
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33 import re
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34 import tkinter
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35 from idlelib import macosxSupport
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36
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37 # the event type constants, which define the meaning of mc_type
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38 MC_KEYPRESS=0; MC_KEYRELEASE=1; MC_BUTTONPRESS=2; MC_BUTTONRELEASE=3;
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39 MC_ACTIVATE=4; MC_CIRCULATE=5; MC_COLORMAP=6; MC_CONFIGURE=7;
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40 MC_DEACTIVATE=8; MC_DESTROY=9; MC_ENTER=10; MC_EXPOSE=11; MC_FOCUSIN=12;
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41 MC_FOCUSOUT=13; MC_GRAVITY=14; MC_LEAVE=15; MC_MAP=16; MC_MOTION=17;
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42 MC_MOUSEWHEEL=18; MC_PROPERTY=19; MC_REPARENT=20; MC_UNMAP=21; MC_VISIBILITY=22;
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43 # the modifier state constants, which define the meaning of mc_state
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44 MC_SHIFT = 1<<0; MC_CONTROL = 1<<2; MC_ALT = 1<<3; MC_META = 1<<5
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45 MC_OPTION = 1<<6; MC_COMMAND = 1<<7
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46
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47 # define the list of modifiers, to be used in complex event types.
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48 if macosxSupport.runningAsOSXApp():
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49 _modifiers = (("Shift",), ("Control",), ("Option",), ("Command",))
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50 _modifier_masks = (MC_SHIFT, MC_CONTROL, MC_OPTION, MC_COMMAND)
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51 else:
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52 _modifiers = (("Control",), ("Alt",), ("Shift",), ("Meta", "M"))
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53 _modifier_masks = (MC_CONTROL, MC_ALT, MC_SHIFT, MC_META)
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54
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55 # a dictionary to map a modifier name into its number
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56 _modifier_names = dict([(name, number)
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57 for number in range(len(_modifiers))
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58 for name in _modifiers[number]])
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59
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60 # A binder is a class which binds functions to one type of event. It has two
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61 # methods: bind and unbind, which get a function and a parsed sequence, as
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62 # returned by _parse_sequence(). There are two types of binders:
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63 # _SimpleBinder handles event types with no modifiers and no detail.
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64 # No Python functions are called when no events are binded.
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65 # _ComplexBinder handles event types with modifiers and a detail.
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66 # A Python function is called each time an event is generated.
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67
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68 class _SimpleBinder:
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69 def __init__(self, type, widget, widgetinst):
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70 self.type = type
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71 self.sequence = '<'+_types[type][0]+'>'
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72 self.widget = widget
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73 self.widgetinst = widgetinst
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74 self.bindedfuncs = []
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75 self.handlerid = None
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76
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77 def bind(self, triplet, func):
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78 if not self.handlerid:
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79 def handler(event, l = self.bindedfuncs, mc_type = self.type):
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80 event.mc_type = mc_type
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81 wascalled = {}
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82 for i in range(len(l)-1, -1, -1):
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83 func = l[i]
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84 if func not in wascalled:
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85 wascalled[func] = True
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86 r = func(event)
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87 if r:
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88 return r
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89 self.handlerid = self.widget.bind(self.widgetinst,
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90 self.sequence, handler)
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91 self.bindedfuncs.append(func)
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92
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93 def unbind(self, triplet, func):
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94 self.bindedfuncs.remove(func)
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95 if not self.bindedfuncs:
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96 self.widget.unbind(self.widgetinst, self.sequence, self.handlerid)
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97 self.handlerid = None
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98
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99 def __del__(self):
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100 if self.handlerid:
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101 self.widget.unbind(self.widgetinst, self.sequence, self.handlerid)
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102
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103 # An int in range(1 << len(_modifiers)) represents a combination of modifiers
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104 # (if the least significent bit is on, _modifiers[0] is on, and so on).
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105 # _state_subsets gives for each combination of modifiers, or *state*,
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106 # a list of the states which are a subset of it. This list is ordered by the
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107 # number of modifiers is the state - the most specific state comes first.
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108 _states = range(1 << len(_modifiers))
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109 _state_names = [''.join(m[0]+'-'
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110 for i, m in enumerate(_modifiers)
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111 if (1 << i) & s)
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112 for s in _states]
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113
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114 def expand_substates(states):
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115 '''For each item of states return a list containing all combinations of
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116 that item with individual bits reset, sorted by the number of set bits.
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117 '''
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118 def nbits(n):
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119 "number of bits set in n base 2"
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120 nb = 0
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121 while n:
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122 n, rem = divmod(n, 2)
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123 nb += rem
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124 return nb
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125 statelist = []
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126 for state in states:
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127 substates = list(set(state & x for x in states))
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128 substates.sort(key=nbits, reverse=True)
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129 statelist.append(substates)
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130 return statelist
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131
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132 _state_subsets = expand_substates(_states)
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133
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134 # _state_codes gives for each state, the portable code to be passed as mc_state
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135 _state_codes = []
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136 for s in _states:
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137 r = 0
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138 for i in range(len(_modifiers)):
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139 if (1 << i) & s:
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140 r |= _modifier_masks[i]
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141 _state_codes.append(r)
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142
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143 class _ComplexBinder:
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144 # This class binds many functions, and only unbinds them when it is deleted.
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145 # self.handlerids is the list of seqs and ids of binded handler functions.
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146 # The binded functions sit in a dictionary of lists of lists, which maps
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147 # a detail (or None) and a state into a list of functions.
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148 # When a new detail is discovered, handlers for all the possible states
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149 # are binded.
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150
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151 def __create_handler(self, lists, mc_type, mc_state):
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152 def handler(event, lists = lists,
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153 mc_type = mc_type, mc_state = mc_state,
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154 ishandlerrunning = self.ishandlerrunning,
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155 doafterhandler = self.doafterhandler):
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156 ishandlerrunning[:] = [True]
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157 event.mc_type = mc_type
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158 event.mc_state = mc_state
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159 wascalled = {}
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160 r = None
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161 for l in lists:
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162 for i in range(len(l)-1, -1, -1):
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163 func = l[i]
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164 if func not in wascalled:
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165 wascalled[func] = True
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166 r = l[i](event)
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167 if r:
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168 break
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169 if r:
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170 break
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171 ishandlerrunning[:] = []
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172 # Call all functions in doafterhandler and remove them from list
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173 while doafterhandler:
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174 doafterhandler.pop()()
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175 if r:
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176 return r
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177 return handler
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178
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179 def __init__(self, type, widget, widgetinst):
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180 self.type = type
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181 self.typename = _types[type][0]
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182 self.widget = widget
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183 self.widgetinst = widgetinst
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184 self.bindedfuncs = {None: [[] for s in _states]}
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185 self.handlerids = []
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186 # we don't want to change the lists of functions while a handler is
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187 # running - it will mess up the loop and anyway, we usually want the
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188 # change to happen from the next event. So we have a list of functions
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189 # for the handler to run after it finishes calling the binded functions.
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190 # It calls them only once.
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191 # ishandlerrunning is a list. An empty one means no, otherwise - yes.
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192 # this is done so that it would be mutable.
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193 self.ishandlerrunning = []
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194 self.doafterhandler = []
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195 for s in _states:
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196 lists = [self.bindedfuncs[None][i] for i in _state_subsets[s]]
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197 handler = self.__create_handler(lists, type, _state_codes[s])
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198 seq = '<'+_state_names[s]+self.typename+'>'
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199 self.handlerids.append((seq, self.widget.bind(self.widgetinst,
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200 seq, handler)))
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201
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202 def bind(self, triplet, func):
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203 if triplet[2] not in self.bindedfuncs:
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204 self.bindedfuncs[triplet[2]] = [[] for s in _states]
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205 for s in _states:
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206 lists = [ self.bindedfuncs[detail][i]
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207 for detail in (triplet[2], None)
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208 for i in _state_subsets[s] ]
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209 handler = self.__create_handler(lists, self.type,
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210 _state_codes[s])
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211 seq = "<%s%s-%s>"% (_state_names[s], self.typename, triplet[2])
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212 self.handlerids.append((seq, self.widget.bind(self.widgetinst,
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213 seq, handler)))
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214 doit = lambda: self.bindedfuncs[triplet[2]][triplet[0]].append(func)
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215 if not self.ishandlerrunning:
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216 doit()
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217 else:
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218 self.doafterhandler.append(doit)
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219
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220 def unbind(self, triplet, func):
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221 doit = lambda: self.bindedfuncs[triplet[2]][triplet[0]].remove(func)
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222 if not self.ishandlerrunning:
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223 doit()
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224 else:
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225 self.doafterhandler.append(doit)
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226
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227 def __del__(self):
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228 for seq, id in self.handlerids:
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229 self.widget.unbind(self.widgetinst, seq, id)
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230
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231 # define the list of event types to be handled by MultiEvent. the order is
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232 # compatible with the definition of event type constants.
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233 _types = (
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234 ("KeyPress", "Key"), ("KeyRelease",), ("ButtonPress", "Button"),
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235 ("ButtonRelease",), ("Activate",), ("Circulate",), ("Colormap",),
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236 ("Configure",), ("Deactivate",), ("Destroy",), ("Enter",), ("Expose",),
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237 ("FocusIn",), ("FocusOut",), ("Gravity",), ("Leave",), ("Map",),
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238 ("Motion",), ("MouseWheel",), ("Property",), ("Reparent",), ("Unmap",),
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239 ("Visibility",),
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240 )
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241
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242 # which binder should be used for every event type?
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243 _binder_classes = (_ComplexBinder,) * 4 + (_SimpleBinder,) * (len(_types)-4)
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244
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245 # A dictionary to map a type name into its number
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246 _type_names = dict([(name, number)
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247 for number in range(len(_types))
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248 for name in _types[number]])
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249
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250 _keysym_re = re.compile(r"^\w+$")
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251 _button_re = re.compile(r"^[1-5]$")
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252 def _parse_sequence(sequence):
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253 """Get a string which should describe an event sequence. If it is
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254 successfully parsed as one, return a tuple containing the state (as an int),
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255 the event type (as an index of _types), and the detail - None if none, or a
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256 string if there is one. If the parsing is unsuccessful, return None.
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257 """
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258 if not sequence or sequence[0] != '<' or sequence[-1] != '>':
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259 return None
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260 words = sequence[1:-1].split('-')
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261 modifiers = 0
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262 while words and words[0] in _modifier_names:
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263 modifiers |= 1 << _modifier_names[words[0]]
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264 del words[0]
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265 if words and words[0] in _type_names:
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266 type = _type_names[words[0]]
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267 del words[0]
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268 else:
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269 return None
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270 if _binder_classes[type] is _SimpleBinder:
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271 if modifiers or words:
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272 return None
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273 else:
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274 detail = None
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275 else:
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276 # _ComplexBinder
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277 if type in [_type_names[s] for s in ("KeyPress", "KeyRelease")]:
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278 type_re = _keysym_re
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279 else:
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280 type_re = _button_re
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281
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282 if not words:
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283 detail = None
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284 elif len(words) == 1 and type_re.match(words[0]):
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285 detail = words[0]
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286 else:
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287 return None
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288
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289 return modifiers, type, detail
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290
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291 def _triplet_to_sequence(triplet):
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292 if triplet[2]:
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293 return '<'+_state_names[triplet[0]]+_types[triplet[1]][0]+'-'+ \
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294 triplet[2]+'>'
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295 else:
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296 return '<'+_state_names[triplet[0]]+_types[triplet[1]][0]+'>'
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297
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298 _multicall_dict = {}
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299 def MultiCallCreator(widget):
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300 """Return a MultiCall class which inherits its methods from the
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301 given widget class (for example, Tkinter.Text). This is used
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302 instead of a templating mechanism.
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303 """
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304 if widget in _multicall_dict:
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305 return _multicall_dict[widget]
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306
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307 class MultiCall (widget):
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308 assert issubclass(widget, tkinter.Misc)
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309
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310 def __init__(self, *args, **kwargs):
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311 widget.__init__(self, *args, **kwargs)
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312 # a dictionary which maps a virtual event to a tuple with:
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313 # 0. the function binded
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314 # 1. a list of triplets - the sequences it is binded to
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315 self.__eventinfo = {}
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316 self.__binders = [_binder_classes[i](i, widget, self)
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317 for i in range(len(_types))]
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318
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319 def bind(self, sequence=None, func=None, add=None):
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320 #print("bind(%s, %s, %s)" % (sequence, func, add),
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321 # file=sys.__stderr__)
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322 if type(sequence) is str and len(sequence) > 2 and \
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323 sequence[:2] == "<<" and sequence[-2:] == ">>":
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324 if sequence in self.__eventinfo:
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325 ei = self.__eventinfo[sequence]
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326 if ei[0] is not None:
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327 for triplet in ei[1]:
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328 self.__binders[triplet[1]].unbind(triplet, ei[0])
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329 ei[0] = func
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330 if ei[0] is not None:
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331 for triplet in ei[1]:
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332 self.__binders[triplet[1]].bind(triplet, func)
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333 else:
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334 self.__eventinfo[sequence] = [func, []]
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335 return widget.bind(self, sequence, func, add)
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336
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337 def unbind(self, sequence, funcid=None):
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338 if type(sequence) is str and len(sequence) > 2 and \
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339 sequence[:2] == "<<" and sequence[-2:] == ">>" and \
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340 sequence in self.__eventinfo:
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341 func, triplets = self.__eventinfo[sequence]
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342 if func is not None:
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343 for triplet in triplets:
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344 self.__binders[triplet[1]].unbind(triplet, func)
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345 self.__eventinfo[sequence][0] = None
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346 return widget.unbind(self, sequence, funcid)
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347
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348 def event_add(self, virtual, *sequences):
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349 #print("event_add(%s, %s)" % (repr(virtual), repr(sequences)),
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350 # file=sys.__stderr__)
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351 if virtual not in self.__eventinfo:
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352 self.__eventinfo[virtual] = [None, []]
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353
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354 func, triplets = self.__eventinfo[virtual]
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355 for seq in sequences:
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356 triplet = _parse_sequence(seq)
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357 if triplet is None:
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358 #print("Tkinter event_add(%s)" % seq, file=sys.__stderr__)
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359 widget.event_add(self, virtual, seq)
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360 else:
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361 if func is not None:
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362 self.__binders[triplet[1]].bind(triplet, func)
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363 triplets.append(triplet)
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364
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365 def event_delete(self, virtual, *sequences):
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366 if virtual not in self.__eventinfo:
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367 return
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368 func, triplets = self.__eventinfo[virtual]
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369 for seq in sequences:
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370 triplet = _parse_sequence(seq)
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371 if triplet is None:
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372 #print("Tkinter event_delete: %s" % seq, file=sys.__stderr__)
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373 widget.event_delete(self, virtual, seq)
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374 else:
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375 if func is not None:
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376 self.__binders[triplet[1]].unbind(triplet, func)
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377 triplets.remove(triplet)
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378
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379 def event_info(self, virtual=None):
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380 if virtual is None or virtual not in self.__eventinfo:
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381 return widget.event_info(self, virtual)
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382 else:
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383 return tuple(map(_triplet_to_sequence,
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384 self.__eventinfo[virtual][1])) + \
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385 widget.event_info(self, virtual)
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386
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387 def __del__(self):
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388 for virtual in self.__eventinfo:
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389 func, triplets = self.__eventinfo[virtual]
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390 if func:
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391 for triplet in triplets:
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392 self.__binders[triplet[1]].unbind(triplet, func)
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393
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394
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395 _multicall_dict[widget] = MultiCall
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396 return MultiCall
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397
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398 if __name__ == "__main__":
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399 # Test
47130
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Georg Brandl <georg@python.org>
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400 root = tkinter.Tk()
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Georg Brandl <georg@python.org>
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401 text = MultiCallCreator(tkinter.Text)(root)
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402 text.pack()
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403 def bindseq(seq, n=[0]):
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404 def handler(event):
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4cdf21a0dbbc Fix most trivially-findable print statements.
Guido van Rossum <guido@python.org>
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405 print(seq)
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406 text.bind("<<handler%d>>"%n[0], handler)
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407 text.event_add("<<handler%d>>"%n[0], seq)
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408 n[0] += 1
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409 bindseq("<Key>")
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410 bindseq("<Control-Key>")
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411 bindseq("<Alt-Key-a>")
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412 bindseq("<Control-Key-a>")
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413 bindseq("<Alt-Control-Key-a>")
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414 bindseq("<Key-b>")
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Kurt B. Kaiser <kbk@shore.net>
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415 bindseq("<Control-Button-1>")
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Kurt B. Kaiser <kbk@shore.net>
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416 bindseq("<Alt-Button-1>")
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Kurt B. Kaiser <kbk@shore.net>
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417 bindseq("<FocusOut>")
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Kurt B. Kaiser <kbk@shore.net>
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418 bindseq("<Enter>")
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419 bindseq("<Leave>")
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420 root.mainloop()