| 1 | n/a | from idlelib.WidgetRedirector import WidgetRedirector |
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| 2 | n/a | from idlelib.Delegator import Delegator |
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| 3 | n/a | |
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| 4 | n/a | class Percolator: |
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| 5 | n/a | |
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| 6 | n/a | def __init__(self, text): |
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| 7 | n/a | # XXX would be nice to inherit from Delegator |
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| 8 | n/a | self.text = text |
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| 9 | n/a | self.redir = WidgetRedirector(text) |
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| 10 | n/a | self.top = self.bottom = Delegator(text) |
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| 11 | n/a | self.bottom.insert = self.redir.register("insert", self.insert) |
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| 12 | n/a | self.bottom.delete = self.redir.register("delete", self.delete) |
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| 13 | n/a | self.filters = [] |
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| 14 | n/a | |
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| 15 | n/a | def close(self): |
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| 16 | n/a | while self.top is not self.bottom: |
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| 17 | n/a | self.removefilter(self.top) |
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| 18 | n/a | self.top = None |
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| 19 | n/a | self.bottom.setdelegate(None); self.bottom = None |
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| 20 | n/a | self.redir.close(); self.redir = None |
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| 21 | n/a | self.text = None |
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| 22 | n/a | |
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| 23 | n/a | def insert(self, index, chars, tags=None): |
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| 24 | n/a | # Could go away if inheriting from Delegator |
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| 25 | n/a | self.top.insert(index, chars, tags) |
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| 26 | n/a | |
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| 27 | n/a | def delete(self, index1, index2=None): |
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| 28 | n/a | # Could go away if inheriting from Delegator |
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| 29 | n/a | self.top.delete(index1, index2) |
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| 30 | n/a | |
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| 31 | n/a | def insertfilter(self, filter): |
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| 32 | n/a | # Perhaps rename to pushfilter()? |
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| 33 | n/a | assert isinstance(filter, Delegator) |
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| 34 | n/a | assert filter.delegate is None |
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| 35 | n/a | filter.setdelegate(self.top) |
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| 36 | n/a | self.top = filter |
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| 37 | n/a | |
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| 38 | n/a | def removefilter(self, filter): |
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| 39 | n/a | # XXX Perhaps should only support popfilter()? |
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| 40 | n/a | assert isinstance(filter, Delegator) |
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| 41 | n/a | assert filter.delegate is not None |
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| 42 | n/a | f = self.top |
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| 43 | n/a | if f is filter: |
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| 44 | n/a | self.top = filter.delegate |
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| 45 | n/a | filter.setdelegate(None) |
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| 46 | n/a | else: |
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| 47 | n/a | while f.delegate is not filter: |
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| 48 | n/a | assert f is not self.bottom |
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| 49 | n/a | f.resetcache() |
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| 50 | n/a | f = f.delegate |
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| 51 | n/a | f.setdelegate(filter.delegate) |
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| 52 | n/a | filter.setdelegate(None) |
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| 53 | n/a | |
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| 54 | n/a | def main(): |
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| 55 | n/a | import tkinter as Tk |
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| 56 | n/a | class Tracer(Delegator): |
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| 57 | n/a | def __init__(self, name): |
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| 58 | n/a | self.name = name |
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| 59 | n/a | Delegator.__init__(self, None) |
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| 60 | n/a | def insert(self, *args): |
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| 61 | n/a | print(self.name, ": insert", args) |
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| 62 | n/a | self.delegate.insert(*args) |
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| 63 | n/a | def delete(self, *args): |
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| 64 | n/a | print(self.name, ": delete", args) |
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| 65 | n/a | self.delegate.delete(*args) |
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| 66 | n/a | root = Tk.Tk() |
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| 67 | n/a | root.wm_protocol("WM_DELETE_WINDOW", root.quit) |
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| 68 | n/a | text = Tk.Text() |
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| 69 | n/a | text.pack() |
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| 70 | n/a | text.focus_set() |
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| 71 | n/a | p = Percolator(text) |
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| 72 | n/a | t1 = Tracer("t1") |
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| 73 | n/a | t2 = Tracer("t2") |
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| 74 | n/a | p.insertfilter(t1) |
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| 75 | n/a | p.insertfilter(t2) |
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| 76 | n/a | root.mainloop() # click close widget to continue... |
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| 77 | n/a | p.removefilter(t2) |
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| 78 | n/a | root.mainloop() |
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| 79 | n/a | p.insertfilter(t2) |
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| 80 | n/a | p.removefilter(t1) |
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| 81 | n/a | root.mainloop() |
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| 82 | n/a | |
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| 83 | n/a | if __name__ == "__main__": |
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| 84 | n/a | main() |
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