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1 from idlelib.delegator import Delegator
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2 from idlelib.redirector import WidgetRedirector
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3
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4
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5 class Percolator:
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6
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7 def __init__(self, text):
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8 # XXX would be nice to inherit from Delegator
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9 self.text = text
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10 self.redir = WidgetRedirector(text)
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11 self.top = self.bottom = Delegator(text)
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12 self.bottom.insert = self.redir.register("insert", self.insert)
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13 self.bottom.delete = self.redir.register("delete", self.delete)
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14 self.filters = []
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15
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16 def close(self):
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17 while self.top is not self.bottom:
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18 self.removefilter(self.top)
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19 self.top = None
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20 self.bottom.setdelegate(None)
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21 self.bottom = None
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22 self.redir.close()
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23 self.redir = None
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24 self.text = None
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25
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26 def insert(self, index, chars, tags=None):
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27 # Could go away if inheriting from Delegator
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28 self.top.insert(index, chars, tags)
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29
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30 def delete(self, index1, index2=None):
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31 # Could go away if inheriting from Delegator
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32 self.top.delete(index1, index2)
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33
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34 def insertfilter(self, filter):
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35 # Perhaps rename to pushfilter()?
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36 assert isinstance(filter, Delegator)
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37 assert filter.delegate is None
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38 filter.setdelegate(self.top)
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39 self.top = filter
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40
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41 def removefilter(self, filter):
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42 # XXX Perhaps should only support popfilter()?
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43 assert isinstance(filter, Delegator)
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44 assert filter.delegate is not None
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45 f = self.top
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46 if f is filter:
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47 self.top = filter.delegate
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48 filter.setdelegate(None)
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49 else:
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50 while f.delegate is not filter:
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51 assert f is not self.bottom
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52 f.resetcache()
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53 f = f.delegate
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54 f.setdelegate(filter.delegate)
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55 filter.setdelegate(None)
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56
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57
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58 def _percolator(parent): # htest #
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59 import tkinter as tk
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60
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61 class Tracer(Delegator):
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62 def __init__(self, name):
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63 self.name = name
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64 Delegator.__init__(self, None)
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65
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66 def insert(self, *args):
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67 print(self.name, ": insert", args)
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68 self.delegate.insert(*args)
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69
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70 def delete(self, *args):
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71 print(self.name, ": delete", args)
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72 self.delegate.delete(*args)
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73
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74 box = tk.Toplevel(parent)
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75 box.title("Test Percolator")
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76 x, y = map(int, parent.geometry().split('+')[1:])
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77 box.geometry("+%d+%d" % (x, y + 175))
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78 text = tk.Text(box)
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79 p = Percolator(text)
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80 pin = p.insertfilter
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81 pout = p.removefilter
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82 t1 = Tracer("t1")
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83 t2 = Tracer("t2")
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84
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85 def toggle1():
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86 (pin if var1.get() else pout)(t1)
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87 def toggle2():
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88 (pin if var2.get() else pout)(t2)
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89
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90 text.pack()
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91 var1 = tk.IntVar(parent)
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92 cb1 = tk.Checkbutton(box, text="Tracer1", command=toggle1, variable=var1)
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93 cb1.pack()
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94 var2 = tk.IntVar(parent)
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95 cb2 = tk.Checkbutton(box, text="Tracer2", command=toggle2, variable=var2)
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96 cb2.pack()
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97
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98 if __name__ == "__main__":
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99 from unittest import main
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100 main('idlelib.idle_test.test_percolator', verbosity=2, exit=False)
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101
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102 from idlelib.idle_test.htest import run
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103 run(_percolator)
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