1"""A simple but flexible modal dialog box."""
2
3
4from Tkinter import *
5
6
7class SimpleDialog:
8
9    def __init__(self, master,
10                 text='', buttons=[], default=None, cancel=None,
11                 title=None, class_=None):
12        if class_:
13            self.root = Toplevel(master, class_=class_)
14        else:
15            self.root = Toplevel(master)
16        if title:
17            self.root.title(title)
18            self.root.iconname(title)
19        self.message = Message(self.root, text=text, aspect=400)
20        self.message.pack(expand=1, fill=BOTH)
21        self.frame = Frame(self.root)
22        self.frame.pack()
23        self.num = default
24        self.cancel = cancel
25        self.default = default
26        self.root.bind('<Return>', self.return_event)
27        for num in range(len(buttons)):
28            s = buttons[num]
29            b = Button(self.frame, text=s,
30                       command=(lambda self=self, num=num: self.done(num)))
31            if num == default:
32                b.config(relief=RIDGE, borderwidth=8)
33            b.pack(side=LEFT, fill=BOTH, expand=1)
34        self.root.protocol('WM_DELETE_WINDOW', self.wm_delete_window)
35        self._set_transient(master)
36
37    def _set_transient(self, master, relx=0.5, rely=0.3):
38        widget = self.root
39        widget.withdraw() # Remain invisible while we figure out the geometry
40        widget.transient(master)
41        widget.update_idletasks() # Actualize geometry information
42        if master.winfo_ismapped():
43            m_width = master.winfo_width()
44            m_height = master.winfo_height()
45            m_x = master.winfo_rootx()
46            m_y = master.winfo_rooty()
47        else:
48            m_width = master.winfo_screenwidth()
49            m_height = master.winfo_screenheight()
50            m_x = m_y = 0
51        w_width = widget.winfo_reqwidth()
52        w_height = widget.winfo_reqheight()
53        x = m_x + (m_width - w_width) * relx
54        y = m_y + (m_height - w_height) * rely
55        if x+w_width > master.winfo_screenwidth():
56            x = master.winfo_screenwidth() - w_width
57        elif x < 0:
58            x = 0
59        if y+w_height > master.winfo_screenheight():
60            y = master.winfo_screenheight() - w_height
61        elif y < 0:
62            y = 0
63        widget.geometry("+%d+%d" % (x, y))
64        widget.deiconify() # Become visible at the desired location
65
66    def go(self):
67        self.root.wait_visibility()
68        self.root.grab_set()
69        self.root.mainloop()
70        self.root.destroy()
71        return self.num
72
73    def return_event(self, event):
74        if self.default is None:
75            self.root.bell()
76        else:
77            self.done(self.default)
78
79    def wm_delete_window(self):
80        if self.cancel is None:
81            self.root.bell()
82        else:
83            self.done(self.cancel)
84
85    def done(self, num):
86        self.num = num
87        self.root.quit()
88
89
90if __name__ == '__main__':
91
92    def test():
93        root = Tk()
94        def doit(root=root):
95            d = SimpleDialog(root,
96                         text="This is a test dialog.  "
97                              "Would this have been an actual dialog, "
98                              "the buttons below would have been glowing "
99                              "in soft pink light.\n"
100                              "Do you believe this?",
101                         buttons=["Yes", "No", "Cancel"],
102                         default=0,
103                         cancel=2,
104                         title="Test Dialog")
105            print d.go()
106        t = Button(root, text='Test', command=doit)
107        t.pack()
108        q = Button(root, text='Quit', command=t.quit)
109        q.pack()
110        t.mainloop()
111
112    test()
113