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/Demo/tix/samples/Control.py

http://unladen-swallow.googlecode.com/
Python | 122 lines | 68 code | 23 blank | 31 comment | 3 complexity | 9bc1d432380aa7646766354d4de69f45 MD5 | raw file
  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
 21import Tix
 22
 23TCL_ALL_EVENTS          = 0
 24
 25def RunSample (root):
 26    control = DemoControl(root)
 27    control.mainloop()
 28    control.destroy()
 29
 30class 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
 97maker_list = ['P&W', 'GE', 'Rolls Royce']
 98
 99def 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
111def 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
120if __name__ == '__main__':
121    root = Tix.Tk()
122    RunSample(root)