jpayne@68: from idlelib.delegator import Delegator
jpayne@68: from idlelib.redirector import WidgetRedirector
jpayne@68: 
jpayne@68: 
jpayne@68: class Percolator:
jpayne@68: 
jpayne@68:     def __init__(self, text):
jpayne@68:         # XXX would be nice to inherit from Delegator
jpayne@68:         self.text = text
jpayne@68:         self.redir = WidgetRedirector(text)
jpayne@68:         self.top = self.bottom = Delegator(text)
jpayne@68:         self.bottom.insert = self.redir.register("insert", self.insert)
jpayne@68:         self.bottom.delete = self.redir.register("delete", self.delete)
jpayne@68:         self.filters = []
jpayne@68: 
jpayne@68:     def close(self):
jpayne@68:         while self.top is not self.bottom:
jpayne@68:             self.removefilter(self.top)
jpayne@68:         self.top = None
jpayne@68:         self.bottom.setdelegate(None)
jpayne@68:         self.bottom = None
jpayne@68:         self.redir.close()
jpayne@68:         self.redir = None
jpayne@68:         self.text = None
jpayne@68: 
jpayne@68:     def insert(self, index, chars, tags=None):
jpayne@68:         # Could go away if inheriting from Delegator
jpayne@68:         self.top.insert(index, chars, tags)
jpayne@68: 
jpayne@68:     def delete(self, index1, index2=None):
jpayne@68:         # Could go away if inheriting from Delegator
jpayne@68:         self.top.delete(index1, index2)
jpayne@68: 
jpayne@68:     def insertfilter(self, filter):
jpayne@68:         # Perhaps rename to pushfilter()?
jpayne@68:         assert isinstance(filter, Delegator)
jpayne@68:         assert filter.delegate is None
jpayne@68:         filter.setdelegate(self.top)
jpayne@68:         self.top = filter
jpayne@68: 
jpayne@68:     def removefilter(self, filter):
jpayne@68:         # XXX Perhaps should only support popfilter()?
jpayne@68:         assert isinstance(filter, Delegator)
jpayne@68:         assert filter.delegate is not None
jpayne@68:         f = self.top
jpayne@68:         if f is filter:
jpayne@68:             self.top = filter.delegate
jpayne@68:             filter.setdelegate(None)
jpayne@68:         else:
jpayne@68:             while f.delegate is not filter:
jpayne@68:                 assert f is not self.bottom
jpayne@68:                 f.resetcache()
jpayne@68:                 f = f.delegate
jpayne@68:             f.setdelegate(filter.delegate)
jpayne@68:             filter.setdelegate(None)
jpayne@68: 
jpayne@68: 
jpayne@68: def _percolator(parent):  # htest #
jpayne@68:     import tkinter as tk
jpayne@68: 
jpayne@68:     class Tracer(Delegator):
jpayne@68:         def __init__(self, name):
jpayne@68:             self.name = name
jpayne@68:             Delegator.__init__(self, None)
jpayne@68: 
jpayne@68:         def insert(self, *args):
jpayne@68:             print(self.name, ": insert", args)
jpayne@68:             self.delegate.insert(*args)
jpayne@68: 
jpayne@68:         def delete(self, *args):
jpayne@68:             print(self.name, ": delete", args)
jpayne@68:             self.delegate.delete(*args)
jpayne@68: 
jpayne@68:     box = tk.Toplevel(parent)
jpayne@68:     box.title("Test Percolator")
jpayne@68:     x, y = map(int, parent.geometry().split('+')[1:])
jpayne@68:     box.geometry("+%d+%d" % (x, y + 175))
jpayne@68:     text = tk.Text(box)
jpayne@68:     p = Percolator(text)
jpayne@68:     pin = p.insertfilter
jpayne@68:     pout = p.removefilter
jpayne@68:     t1 = Tracer("t1")
jpayne@68:     t2 = Tracer("t2")
jpayne@68: 
jpayne@68:     def toggle1():
jpayne@68:         (pin if var1.get() else pout)(t1)
jpayne@68:     def toggle2():
jpayne@68:         (pin if var2.get() else pout)(t2)
jpayne@68: 
jpayne@68:     text.pack()
jpayne@68:     var1 = tk.IntVar(parent)
jpayne@68:     cb1 = tk.Checkbutton(box, text="Tracer1", command=toggle1, variable=var1)
jpayne@68:     cb1.pack()
jpayne@68:     var2 = tk.IntVar(parent)
jpayne@68:     cb2 = tk.Checkbutton(box, text="Tracer2", command=toggle2, variable=var2)
jpayne@68:     cb2.pack()
jpayne@68: 
jpayne@68: if __name__ == "__main__":
jpayne@68:     from unittest import main
jpayne@68:     main('idlelib.idle_test.test_percolator', verbosity=2, exit=False)
jpayne@68: 
jpayne@68:     from idlelib.idle_test.htest import run
jpayne@68:     run(_percolator)