1 # -*-mode: python; fill-column: 75; tab-width: 8; coding: iso-latin-1-unix -*-

     2 #

     3 # $Id: Control.py 36560 2004-07-18 06:16:08Z tim_one $

     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)