Demo/tix/samples/Control.py

   1 #!/usr/local/bin/python
   2 #
   3 # $Id$
   4 #
   5 # Tix Demostration Program
   6 #
   7 # This sample program is structured in such a way so that it can be
   8 # executed from the Tix demo program "tixwidgets": it must have a
   9 # procedure called "RunSample". It should also have the "if" statment
  10 # at the end of this file so that it can be run as a standalone
  11 # program.
  12
  13 # This file demonstrates the use of the tixControl widget -- it is an
  14 # entry widget with up/down arrow buttons. You can use the arrow buttons
  15 # to adjust the value inside the entry widget.
  16 #
  17 # This example program uses three Control widgets. One lets you select
  18 # integer values; one lets you select floating point values and the last
  19 # one lets you select a few names.
  20 #
  21 import Tix
  22
  23 def RunSample(w):
  24     global demo_maker, demo_thrust, demo_num_engines
  25
  26     demo_maker = Tix.StringVar()
  27     demo_thrust = Tix.DoubleVar()
  28     demo_num_engines = Tix.IntVar()
  29     demo_maker.set('P&W')
  30     demo_thrust.set(20000.0)
  31     demo_num_engines.set(2)
  32
  33     top = Tix.Frame(w, bd=1, relief=Tix.RAISED)
  34
  35     # $w.top.a allows only integer values
  36     #
  37     # [Hint] The -options switch sets the options of the subwidgets.
  38     # [Hint] We set the label.width subwidget option of the Controls to
  39     #        be 16 so that their labels appear to be aligned.
  40     #
  41     a = Tix.Control(top, label='Number of Engines: ', integer=1,
  42                     variable=demo_num_engines, min=1, max=4,
  43                     options='entry.width 10 label.width 20 label.anchor e')
  44
  45     b = Tix.Control(top, label='Thrust: ', integer=0,
  46                     min='10000.0', max='60000.0', step=500,
  47                     variable=demo_thrust,
  48                     options='entry.width 10 label.width 20 label.anchor e')
  49
  50     c = Tix.Control(top, label='Engine Maker: ', value='P&W',
  51                     variable=demo_maker,
  52                     options='entry.width 10 label.width 20 label.anchor e')
  53
  54     # We can't define these in the init because the widget 'c' doesn't
  55     # exist yet and we need to reference it
  56     c['incrcmd'] = lambda w=c: adjust_maker(w, 1)
  57     c['decrcmd'] = lambda w=c: adjust_maker(w, -1)
  58     c['validatecmd'] = lambda w=c: validate_maker(w)
  59
  60     a.pack(side=Tix.TOP, anchor=Tix.W)
  61     b.pack(side=Tix.TOP, anchor=Tix.W)
  62     c.pack(side=Tix.TOP, anchor=Tix.W)
  63
  64     box = Tix.ButtonBox(w, orientation=Tix.HORIZONTAL)
  65     box.add('ok', text='Ok', underline=0, width=6,
  66             command=lambda w=w: ok_command(w))
  67     box.add('cancel', text='Cancel', underline=0, width=6,
  68             command=lambda w=w: w.destroy())
  69     box.pack(side=Tix.BOTTOM, fill=Tix.X)
  70     top.pack(side=Tix.TOP, fill=Tix.BOTH, expand=1)
  71
  72 maker_list = ['P&W', 'GE', 'Rolls Royce']
  73
  74 def adjust_maker(w, inc):
  75     i = maker_list.index(demo_maker.get())
  76     i = i + inc
  77     if i >= len(maker_list):
  78         i = 0
  79     elif i < 0:
  80         i = len(maker_list) - 1
  81
  82     # In Tcl/Tix we should return the string maker_list[i]. We can't
  83     # do that in Tkinter so we set the global variable. (This works).
  84     demo_maker.set(maker_list[i])
  85
  86 def validate_maker(w):
  87     try:
  88         i = maker_list.index(demo_maker.get())
  89     except:
  90         # Works here though. Why ? Beats me.
  91         return maker_list[0]
  92     # Works here though. Why ? Beats me.
  93     return maker_list[i]
  94
  95 def ok_command(w):
  96     print "Selected", demo_num_engines.get(), "of", demo_maker.get(), " engines each of thrust", demo_thrust.get()
  97     w.destroy()
  98
  99 if __name__ == '__main__':
 100     root = Tix.Tk()
 101     RunSample(root)
 102     root.mainloop()