Preview: percolator.py
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/opt/alt/python37/lib64/python3.7/idlelib/percolator.py
from idlelib.delegator import Delegator
from idlelib.redirector import WidgetRedirector
class Percolator:
def __init__(self, text):
# XXX would be nice to inherit from Delegator
self.text = text
self.redir = WidgetRedirector(text)
self.top = self.bottom = Delegator(text)
self.bottom.insert = self.redir.register("insert", self.insert)
self.bottom.delete = self.redir.register("delete", self.delete)
self.filters = []
def close(self):
while self.top is not self.bottom:
self.removefilter(self.top)
self.top = None
self.bottom.setdelegate(None)
self.bottom = None
self.redir.close()
self.redir = None
self.text = None
def insert(self, index, chars, tags=None):
# Could go away if inheriting from Delegator
self.top.insert(index, chars, tags)
def delete(self, index1, index2=None):
# Could go away if inheriting from Delegator
self.top.delete(index1, index2)
def insertfilter(self, filter):
# Perhaps rename to pushfilter()?
assert isinstance(filter, Delegator)
assert filter.delegate is None
filter.setdelegate(self.top)
self.top = filter
def removefilter(self, filter):
# XXX Perhaps should only support popfilter()?
assert isinstance(filter, Delegator)
assert filter.delegate is not None
f = self.top
if f is filter:
self.top = filter.delegate
filter.setdelegate(None)
else:
while f.delegate is not filter:
assert f is not self.bottom
f.resetcache()
f = f.delegate
f.setdelegate(filter.delegate)
filter.setdelegate(None)
def _percolator(parent): # htest #
import tkinter as tk
class Tracer(Delegator):
def __init__(self, name):
self.name = name
Delegator.__init__(self, None)
def insert(self, *args):
print(self.name, ": insert", args)
self.delegate.insert(*args)
def delete(self, *args):
print(self.name, ": delete", args)
self.delegate.delete(*args)
box = tk.Toplevel(parent)
box.title("Test Percolator")
x, y = map(int, parent.geometry().split('+')[1:])
box.geometry("+%d+%d" % (x, y + 175))
text = tk.Text(box)
p = Percolator(text)
pin = p.insertfilter
pout = p.removefilter
t1 = Tracer("t1")
t2 = Tracer("t2")
def toggle1():
(pin if var1.get() else pout)(t1)
def toggle2():
(pin if var2.get() else pout)(t2)
text.pack()
var1 = tk.IntVar(parent)
cb1 = tk.Checkbutton(box, text="Tracer1", command=toggle1, variable=var1)
cb1.pack()
var2 = tk.IntVar(parent)
cb2 = tk.Checkbutton(box, text="Tracer2", command=toggle2, variable=var2)
cb2.pack()
if __name__ == "__main__":
from unittest import main
main('idlelib.idle_test.test_percolator', verbosity=2, exit=False)
from idlelib.idle_test.htest import run
run(_percolator)
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