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

#

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

#

# Tix Demostration Program

#

# This sample program is structured in such a way so that it can be

# executed from the Tix demo program "tixwidgets.py": it must have a

# procedure called "RunSample". It should also have the "if" statment

# at the end of this file so that it can be run as a standalone

# program.

# This file demonstrates the use of the tixControl widget -- it is an

# entry widget with up/down arrow buttons. You can use the arrow buttons

# to adjust the value inside the entry widget.

#

# This example program uses three Control widgets. One lets you select

# integer values; one lets you select floating point values and the last

# one lets you select a few names.

import Tix

TCL_ALL_EVENTS          = 0

def RunSample (root):

    control = DemoControl(root)

    control.mainloop()

    control.destroy()

class DemoControl:

    def __init__(self, w):

        self.root = w

        self.exit = -1

        global demo_maker, demo_thrust, demo_num_engines

        demo_maker = Tix.StringVar()

        demo_thrust = Tix.DoubleVar()

        demo_num_engines = Tix.IntVar()

        demo_maker.set('P&W')

        demo_thrust.set(20000.0)

        demo_num_engines.set(2)

        top = Tix.Frame(w, bd=1, relief=Tix.RAISED)

        # $w.top.a allows only integer values

        #

        # [Hint] The -options switch sets the options of the subwidgets.

        # [Hint] We set the label.width subwidget option of the Controls to

        #        be 16 so that their labels appear to be aligned.

        #

        a = Tix.Control(top, label='Number of Engines: ', integer=1,

                        variable=demo_num_engines, min=1, max=4,

                        options='entry.width 10 label.width 20 label.anchor e')

        b = Tix.Control(top, label='Thrust: ', integer=0,

                        min='10000.0', max='60000.0', step=500,

                        variable=demo_thrust,

                        options='entry.width 10 label.width 20 label.anchor e')

        c = Tix.Control(top, label='Engine Maker: ', value='P&W',

                        variable=demo_maker,

                        options='entry.width 10 label.width 20 label.anchor e')

        # We can't define these in the init because the widget 'c' doesn't

        # exist yet and we need to reference it

        c['incrcmd'] = lambda w=c: adjust_maker(w, 1)

        c['decrcmd'] = lambda w=c: adjust_maker(w, -1)

        c['validatecmd'] = lambda w=c: validate_maker(w)

        a.pack(side=Tix.TOP, anchor=Tix.W)

        b.pack(side=Tix.TOP, anchor=Tix.W)

        c.pack(side=Tix.TOP, anchor=Tix.W)

        box = Tix.ButtonBox(w, orientation=Tix.HORIZONTAL)

        box.add('ok', text='Ok', underline=0, width=6,

                command=self.okcmd)

        box.add('cancel', text='Cancel', underline=0, width=6,

                command=self.quitcmd)

        box.pack(side=Tix.BOTTOM, fill=Tix.X)

        top.pack(side=Tix.TOP, fill=Tix.BOTH, expand=1)

    def okcmd (self):

        # tixDemo:Status "Selected %d of %s engines each of thrust %d", (demo_num_engines.get(), demo_maker.get(), demo_thrust.get())

        self.quitcmd()

    def quitcmd (self):

        self.exit = 0

    def mainloop(self):

        while self.exit < 0:

            self.root.tk.dooneevent(TCL_ALL_EVENTS)

    def destroy (self):

        self.root.destroy()

maker_list = ['P&W', 'GE', 'Rolls Royce']

def adjust_maker(w, inc):

    i = maker_list.index(demo_maker.get())

    i = i + inc

    if i >= len(maker_list):

        i = 0

    elif i < 0:

        i = len(maker_list) - 1

    # In Tcl/Tix we should return the string maker_list[i]. We can't

    # do that in Tkinter so we set the global variable. (This works).

    demo_maker.set(maker_list[i])

def validate_maker(w):

    try:

        i = maker_list.index(demo_maker.get())

    except ValueError:

        # Works here though. Why ? Beats me.

        return maker_list[0]

    # Works here though. Why ? Beats me.

    return maker_list[i]

if __name__ == '__main__':

    root = Tix.Tk()

    RunSample(root)