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1"""Sample demo showing widget states and some font styling."""
2import ttk
3
4states = ['active', 'disabled', 'focus', 'pressed', 'selected',
5          'background', 'readonly', 'alternate', 'invalid']
6
7for state in states[:]:
8    states.append("!" + state)
9
10def reset_state(widget):
11    nostate = states[len(states) // 2:]
12    widget.state(nostate)
13
14class App(ttk.Frame):
15    def __init__(self, title=None):
16        ttk.Frame.__init__(self, borderwidth=6)
17        self.master.title(title)
18
19        self.style = ttk.Style()
20
21        # get default font size and family
22        btn_font = self.style.lookup("TButton", "font")
23        fsize = str(self.tk.eval("font configure %s -size" % btn_font))
24        self.font_family = self.tk.eval("font configure %s -family" % btn_font)
25        if ' ' in self.font_family:
26            self.font_family = '{%s}' % self.font_family
27        self.fsize_prefix = fsize[0] if fsize[0] == '-' else ''
28        self.base_fsize = int(fsize[1 if fsize[0] == '-' else 0:])
29
30        # a list to hold all the widgets that will have their states changed
31        self.update_widgets = []
32
33        self._setup_widgets()
34
35    def _set_font(self, extra=0):
36        self.style.configure("TButton", font="%s %s%d" % (self.font_family,
37            self.fsize_prefix, self.base_fsize + extra))
38
39    def _new_state(self, widget, newtext):
40        widget = self.nametowidget(widget)
41
42        if not newtext:
43            goodstates = ["disabled"]
44            font_extra = 0
45        else:
46            # set widget state according to what has been entered in the entry
47            newstates = set(newtext.split()) # eliminate duplicates
48
49            # keep only the valid states
50            goodstates = [state for state in newstates if state in states]
51            # define a new font size based on amount of states
52            font_extra = 2 * len(goodstates)
53
54        # set new widget state
55        for widget in self.update_widgets:
56            reset_state(widget) # remove any previous state from the widget
57            widget.state(goodstates)
58
59        # update Ttk Button font size
60        self._set_font(font_extra)
61        return 1
62
63    def _setup_widgets(self):
64        btn = ttk.Button(self, text='Enter states and watch')
65
66        entry = ttk.Entry(self, cursor='xterm', validate="key")
67        entry['validatecommand'] = (self.register(self._new_state), '%W', '%P')
68        entry.focus()
69
70        self.update_widgets.append(btn)
71        entry.validate()
72
73        entry.pack(fill='x', padx=6)
74        btn.pack(side='left', pady=6, padx=6, anchor='n')
75        self.pack(fill='both', expand=1)
76
77
78def main():
79    app = App("Widget State Tester")
80    app.mainloop()
81
82if __name__ == "__main__":
83    main()
84