晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //usr/lib64/python2.7/Demo/tkinter/ttk/widget_state.py
"""Sample demo showing widget states and some font styling."""
import ttk

states = ['active', 'disabled', 'focus', 'pressed', 'selected',
          'background', 'readonly', 'alternate', 'invalid']

for state in states[:]:
    states.append("!" + state)

def reset_state(widget):
    nostate = states[len(states) // 2:]
    widget.state(nostate)

class App(ttk.Frame):
    def __init__(self, title=None):
        ttk.Frame.__init__(self, borderwidth=6)
        self.master.title(title)

        self.style = ttk.Style()

        # get default font size and family
        btn_font = self.style.lookup("TButton", "font")
        fsize = str(self.tk.eval("font configure %s -size" % btn_font))
        self.font_family = self.tk.eval("font configure %s -family" % btn_font)
        if ' ' in self.font_family:
            self.font_family = '{%s}' % self.font_family
        self.fsize_prefix = fsize[0] if fsize[0] == '-' else ''
        self.base_fsize = int(fsize[1 if fsize[0] == '-' else 0:])

        # a list to hold all the widgets that will have their states changed
        self.update_widgets = []

        self._setup_widgets()

    def _set_font(self, extra=0):
        self.style.configure("TButton", font="%s %s%d" % (self.font_family,
            self.fsize_prefix, self.base_fsize + extra))

    def _new_state(self, widget, newtext):
        widget = self.nametowidget(widget)

        if not newtext:
            goodstates = ["disabled"]
            font_extra = 0
        else:
            # set widget state according to what has been entered in the entry
            newstates = set(newtext.split()) # eliminate duplicates

            # keep only the valid states
            goodstates = [state for state in newstates if state in states]
            # define a new font size based on amount of states
            font_extra = 2 * len(goodstates)

        # set new widget state
        for widget in self.update_widgets:
            reset_state(widget) # remove any previous state from the widget
            widget.state(goodstates)

        # update Ttk Button font size
        self._set_font(font_extra)
        return 1

    def _setup_widgets(self):
        btn = ttk.Button(self, text='Enter states and watch')

        entry = ttk.Entry(self, cursor='xterm', validate="key")
        entry['validatecommand'] = (self.register(self._new_state), '%W', '%P')
        entry.focus()

        self.update_widgets.append(btn)
        entry.validate()

        entry.pack(fill='x', padx=6)
        btn.pack(side='left', pady=6, padx=6, anchor='n')
        self.pack(fill='both', expand=1)


def main():
    app = App("Widget State Tester")
    app.mainloop()

if __name__ == "__main__":
    main()

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