Demo/tkinter/guido/dialog.py

   1 #! /usr/bin/env python
   2
   3 # A Python function that generates dialog boxes with a text message,
   4 # optional bitmap, and any number of buttons.
   5 # Cf. Ousterhout, Tcl and the Tk Toolkit, Figs. 27.2-3, pp. 269-270.
   6
   7 from Tkinter import *
   8 import sys
   9
  10
  11 def dialog(master, title, text, bitmap, default, *args):
  12
  13     # 1. Create the top-level window and divide it into top
  14     # and bottom parts.
  15
  16     w = Toplevel(master, class_='Dialog')
  17     w.title(title)
  18     w.iconname('Dialog')
  19
  20     top = Frame(w, relief=RAISED, borderwidth=1)
  21     top.pack(side=TOP, fill=BOTH)
  22     bot = Frame(w, relief=RAISED, borderwidth=1)
  23     bot.pack(side=BOTTOM, fill=BOTH)
  24
  25     # 2. Fill the top part with the bitmap and message.
  26
  27     msg = Message(top, width='3i', text=text,
  28                   font='-Adobe-Times-Medium-R-Normal-*-180-*')
  29     msg.pack(side=RIGHT, expand=1, fill=BOTH, padx='3m', pady='3m')
  30     if bitmap:
  31         bm = Label(top, bitmap=bitmap)
  32         bm.pack(side=LEFT, padx='3m', pady='3m')
  33
  34     # 3. Create a row of buttons at the bottom of the dialog.
  35
  36     var = IntVar()
  37     buttons = []
  38     i = 0
  39     for but in args:
  40         b = Button(bot, text=but, command=lambda v=var,i=i: v.set(i))
  41         buttons.append(b)
  42         if i == default:
  43             bd = Frame(bot, relief=SUNKEN, borderwidth=1)
  44             bd.pack(side=LEFT, expand=1, padx='3m', pady='2m')
  45             b.lift()
  46             b.pack (in_=bd, side=LEFT,
  47                     padx='2m', pady='2m', ipadx='2m', ipady='1m')
  48         else:
  49             b.pack (side=LEFT, expand=1,
  50                     padx='3m', pady='3m', ipadx='2m', ipady='1m')
  51         i = i+1
  52
  53     # 4. Set up a binding for <Return>, if there's a default,
  54     # set a grab, and claim the focus too.
  55
  56     if default >= 0:
  57         w.bind('<Return>',
  58                lambda e, b=buttons[default], v=var, i=default:
  59                (b.flash(),
  60                 v.set(i)))
  61
  62     oldFocus = w.focus_get()
  63     w.grab_set()
  64     w.focus_set()
  65
  66     # 5. Wait for the user to respond, then restore the focus
  67     # and return the index of the selected button.
  68
  69     w.waitvar(var)
  70     w.destroy()
  71     if oldFocus: oldFocus.focus_set()
  72     return var.get()
  73
  74 # The rest is the test program.
  75
  76 def go():
  77     i = dialog(mainWidget,
  78                'Not Responding',
  79                "The file server isn't responding right now; "
  80                "I'll keep trying.",
  81                '',
  82                -1,
  83                'OK')
  84     print 'pressed button', i
  85     i = dialog(mainWidget,
  86                'File Modified',
  87                'File "tcl.h" has been modified since '
  88                'the last time it was saved. '
  89                'Do you want to save it before exiting the application?',
  90                'warning',
  91                0,
  92                'Save File',
  93                'Discard Changes',
  94                'Return To Editor')
  95     print 'pressed button', i
  96
  97 def test():
  98     import sys
  99     global mainWidget
 100     mainWidget = Frame()
 101     Pack.config(mainWidget)
 102     start = Button(mainWidget, text='Press Here To Start', command=go)
 103     start.pack()
 104     endit = Button(mainWidget, text="Exit", command=sys.exit)
 105     endit.pack(fill=BOTH)
 106     mainWidget.mainloop()
 107
 108 if __name__ == '__main__':
 109     test()