/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
  7from Tkinter import *
  8import sys
  9
 10
 11def 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
 76def 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
 97def 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
108if __name__ == '__main__':
109    test()