from idlelib.WidgetRedirector import WidgetRedirector

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from idlelib.Delegator import Delegator

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class Percolator:

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def __init__(self, text):

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# XXX would be nice to inherit from Delegator

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self.text = text

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self.redir = WidgetRedirector(text)

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self.top = self.bottom = Delegator(text)

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self.bottom.insert = self.redir.register("insert", self.insert)

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self.bottom.delete = self.redir.register("delete", self.delete)

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self.filters = []

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def close(self):

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while self.top is not self.bottom:

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self.removefilter(self.top)

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self.top = None

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self.bottom.setdelegate(None); self.bottom = None

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self.redir.close(); self.redir = None

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self.text = None

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def insert(self, index, chars, tags=None):

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# Could go away if inheriting from Delegator

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self.top.insert(index, chars, tags)

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def delete(self, index1, index2=None):

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# Could go away if inheriting from Delegator

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self.top.delete(index1, index2)

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def insertfilter(self, filter):

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# Perhaps rename to pushfilter()?

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assert isinstance(filter, Delegator)

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assert filter.delegate is None

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filter.setdelegate(self.top)

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self.top = filter

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def removefilter(self, filter):

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# XXX Perhaps should only support popfilter()?

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assert isinstance(filter, Delegator)

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assert filter.delegate is not None

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f = self.top

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if f is filter:

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self.top = filter.delegate

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filter.setdelegate(None)

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else:

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while f.delegate is not filter:

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assert f is not self.bottom

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f.resetcache()

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f = f.delegate

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f.setdelegate(filter.delegate)

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filter.setdelegate(None)

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def _percolator(parent):

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import Tkinter as tk

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import re

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class Tracer(Delegator):

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def __init__(self, name):

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self.name = name

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Delegator.__init__(self, None)

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def insert(self, *args):

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print self.name, ": insert", args

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self.delegate.insert(*args)

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def delete(self, *args):

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print self.name, ": delete", args

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self.delegate.delete(*args)

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root = tk.Tk()

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root.title("Test Percolator")

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width, height, x, y = list(map(int, re.split('[x+]', parent.geometry())))

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root.geometry("+%d+%d"%(x, y + 150))

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text = tk.Text(root)

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p = Percolator(text)

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t1 = Tracer("t1")

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t2 = Tracer("t2")

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def toggle1():

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if var1.get() == 0:

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var1.set(1)

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p.insertfilter(t1)

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elif var1.get() == 1:

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var1.set(0)

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p.removefilter(t1)

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def toggle2():

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if var2.get() == 0:

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var2.set(1)

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p.insertfilter(t2)

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elif var2.get() == 1:

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var2.set(0)

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p.removefilter(t2)

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text.pack()

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var1 = tk.IntVar()

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cb1 = tk.Checkbutton(root, text="Tracer1", command=toggle1, variable=var1)

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cb1.pack()

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var2 = tk.IntVar()

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cb2 = tk.Checkbutton(root, text="Tracer2", command=toggle2, variable=var2)

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cb2.pack()

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if __name__ == "__main__":

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from idlelib.idle_test.htest import run

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run(_percolator)

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