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Edit File : Percolator.py \| Size : 2.60 KB
from idlelib.WidgetRedirector import WidgetRedirector from idlelib.Delegator import Delegator 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 main(): 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) root = Tk.Tk() root.wm_protocol("WM_DELETE_WINDOW", root.quit) text = Tk.Text() text.pack() text.focus_set() p = Percolator(text) t1 = Tracer("t1") t2 = Tracer("t2") p.insertfilter(t1) p.insertfilter(t2) root.mainloop() # click close widget to continue... p.removefilter(t2) root.mainloop() p.insertfilter(t2) p.removefilter(t1) root.mainloop() if __name__ == "__main__": main() Back

Edit File : Percolator.py | Size : 2.60 KB

from idlelib.WidgetRedirector import WidgetRedirector
from idlelib.Delegator import Delegator

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 main():
    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)
    root = Tk.Tk()
    root.wm_protocol("WM_DELETE_WINDOW", root.quit)
    text = Tk.Text()
    text.pack()
    text.focus_set()
    p = Percolator(text)
    t1 = Tracer("t1")
    t2 = Tracer("t2")
    p.insertfilter(t1)
    p.insertfilter(t2)
    root.mainloop() # click close widget to continue...
    p.removefilter(t2)
    root.mainloop()
    p.insertfilter(t2)
    p.removefilter(t1)
    root.mainloop()

if __name__ == "__main__":
    main()

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