mirror of https://github.com/python/cpython.git
93 lines
2.4 KiB
Python
93 lines
2.4 KiB
Python
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from Tkinter import *
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class WidgetRedirector:
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"""Support for redirecting arbitrary widget subcommands."""
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def __init__(self, widget):
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self.dict = {}
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self.widget = widget
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self.tk = tk = widget.tk
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w = widget._w
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self.orig = w + "_orig"
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tk.call("rename", w, self.orig)
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tk.createcommand(w, self.dispatch)
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def __repr__(self):
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return "WidgetRedirector(%s<%s>)" % (self.widget.__class__.__name__,
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self.widget._w)
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def close(self):
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for name in self.dict.keys():
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self.unregister(name)
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widget = self.widget; del self.widget
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orig = self.orig; del self.orig
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tk = widget.tk
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w = widget._w
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tk.deletecommand(w)
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tk.call("rename", orig, w)
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def register(self, name, function):
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if self.dict.has_key(name):
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previous = dict[name]
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else:
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previous = OriginalCommand(self, name)
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self.dict[name] = function
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setattr(self.widget, name, function)
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return previous
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def unregister(self, name):
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if self.dict.has_key(name):
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function = self.dict[name]
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del self.dict[name]
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if hasattr(self.widget, name):
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delattr(self.widget, name)
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return function
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else:
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return None
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def dispatch(self, cmd, *args):
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m = self.dict.get(cmd)
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try:
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if m:
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return apply(m, args)
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else:
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return self.tk.call((self.orig, cmd) + args)
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except TclError:
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return ""
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class OriginalCommand:
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def __init__(self, redir, name):
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self.redir = redir
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self.name = name
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self.tk = redir.tk
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self.orig = redir.orig
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self.tk_call = self.tk.call
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self.orig_and_name = (self.orig, self.name)
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def __repr__(self):
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return "OriginalCommand(%s, %s)" % (`self.redir`, `self.name`)
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def __call__(self, *args):
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return self.tk_call(self.orig_and_name + args)
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def main():
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root = Tk()
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text = Text()
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text.pack()
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text.focus_set()
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redir = WidgetRedirector(text)
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global orig_insert
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def my_insert(*args):
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print "insert", args
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apply(orig_insert, args)
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orig_insert = redir.register("insert", my_insert)
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root.mainloop()
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if __name__ == "__main__":
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main()
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