Demo/tix/samples/Control.py

   1 # -*-mode: python; fill-column: 75; tab-width: 8; coding: iso-latin-1-unix -*-
   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.py": 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 TCL_ALL_EVENTS          = 0
  24
  25 def RunSample (root):
  26     control = DemoControl(root)
  27     control.mainloop()
  28     control.destroy()
  29
  30 class DemoControl:
  31     def __init__(self, w):
  32         self.root = w
  33         self.exit = -1
  34
  35         global demo_maker, demo_thrust, demo_num_engines
  36
  37         demo_maker = Tix.StringVar()
  38         demo_thrust = Tix.DoubleVar()
  39         demo_num_engines = Tix.IntVar()
  40         demo_maker.set('P&W')
  41         demo_thrust.set(20000.0)
  42         demo_num_engines.set(2)
  43
  44         top = Tix.Frame(w, bd=1, relief=Tix.RAISED)
  45
  46         # $w.top.a allows only integer values
  47         #
  48         # [Hint] The -options switch sets the options of the subwidgets.
  49         # [Hint] We set the label.width subwidget option of the Controls to
  50         #        be 16 so that their labels appear to be aligned.
  51         #
  52         a = Tix.Control(top, label='Number of Engines: ', integer=1,
  53                         variable=demo_num_engines, min=1, max=4,
  54                         options='entry.width 10 label.width 20 label.anchor e')
  55
  56         b = Tix.Control(top, label='Thrust: ', integer=0,
  57                         min='10000.0', max='60000.0', step=500,
  58                         variable=demo_thrust,
  59                         options='entry.width 10 label.width 20 label.anchor e')
  60
  61         c = Tix.Control(top, label='Engine Maker: ', value='P&W',
  62                         variable=demo_maker,
  63                         options='entry.width 10 label.width 20 label.anchor e')
  64
  65         # We can't define these in the init because the widget 'c' doesn't
  66         # exist yet and we need to reference it
  67         c['incrcmd'] = lambda w=c: adjust_maker(w, 1)
  68         c['decrcmd'] = lambda w=c: adjust_maker(w, -1)
  69         c['validatecmd'] = lambda w=c: validate_maker(w)
  70
  71         a.pack(side=Tix.TOP, anchor=Tix.W)
  72         b.pack(side=Tix.TOP, anchor=Tix.W)
  73         c.pack(side=Tix.TOP, anchor=Tix.W)
  74
  75         box = Tix.ButtonBox(w, orientation=Tix.HORIZONTAL)
  76         box.add('ok', text='Ok', underline=0, width=6,
  77                 command=self.okcmd)
  78         box.add('cancel', text='Cancel', underline=0, width=6,
  79                 command=self.quitcmd)
  80         box.pack(side=Tix.BOTTOM, fill=Tix.X)
  81         top.pack(side=Tix.TOP, fill=Tix.BOTH, expand=1)
  82
  83     def okcmd (self):
  84         # tixDemo:Status "Selected %d of %s engines each of thrust %d", (demo_num_engines.get(), demo_maker.get(), demo_thrust.get())
  85         self.quitcmd()
  86
  87     def quitcmd (self):
  88         self.exit = 0
  89
  90     def mainloop(self):
  91         while self.exit < 0:
  92             self.root.tk.dooneevent(TCL_ALL_EVENTS)
  93
  94     def destroy (self):
  95         self.root.destroy()
  96
  97 maker_list = ['P&W', 'GE', 'Rolls Royce']
  98
  99 def adjust_maker(w, inc):
 100     i = maker_list.index(demo_maker.get())
 101     i = i + inc
 102     if i >= len(maker_list):
 103         i = 0
 104     elif i < 0:
 105         i = len(maker_list) - 1
 106
 107     # In Tcl/Tix we should return the string maker_list[i]. We can't
 108     # do that in Tkinter so we set the global variable. (This works).
 109     demo_maker.set(maker_list[i])
 110
 111 def validate_maker(w):
 112     try:
 113         i = maker_list.index(demo_maker.get())
 114     except ValueError:
 115         # Works here though. Why ? Beats me.
 116         return maker_list[0]
 117     # Works here though. Why ? Beats me.
 118     return maker_list[i]
 119
 120 if __name__ == '__main__':
 121     root = Tix.Tk()
 122     RunSample(root)