"""Main Pynche (Pythonically Natural Color and Hue Editor) widget.

This window provides the basic decorations, primarily including the menubar.
It is used to bring up other windows.
"""

import sys
from Tkinter import *
import tkMessageBox

# Milliseconds between interrupt checks
KEEPALIVE_TIMER = 500



class PyncheWidget:
    def __init__(self, version, switchboard):
        self.__sb = switchboard
        self.__version = version
        self.__textwin = None
        self.__listwin = None
        # create the first and top window
        root = self.__root = Tk(className='Pynche')
        root.protocol('WM_DELETE_WINDOW', self.__quit)
        root.title('Pynche %s' % version)
        root.iconname('Pynche')
        root.tk.createtimerhandler(KEEPALIVE_TIMER, self.__keepalive)
        #
        # create the menubar
        #
        menubar = self.__menubar = Frame(root, relief=RAISED, borderwidth=2)
        menubar.grid(row=0, column=0, columnspan=2, sticky='EW')
        #
        # File menu
        #
        filebtn = Menubutton(menubar, text='File',
                             underline=0)
        filebtn.pack(side=LEFT)
        filemenu = Menu(filebtn, tearoff=0)
        filebtn['menu'] = filemenu
        filemenu.add_command(label='Quit',
                             command=self.__quit,
                             accelerator='Alt-Q',
                             underline=0)
        root.bind('<Alt-q>', self.__quit)
        root.bind('<Alt-Q>', self.__quit)
        #
        # View menu
        #
        viewbtn = Menubutton(menubar, text='View',
                             underline=0)
        viewbtn.pack(side=LEFT)
        viewmenu = Menu(viewbtn, tearoff=0)
        viewbtn['menu'] = viewmenu
        viewmenu.add_command(label='Text Window...',
                             command=self.__popup_text,
                             underline=0)
        viewmenu.add_command(label='Color List Window...',
                             command=self.__popup_listwin,
                             underline=0)
        #
        # Help menu
        #
        helpbtn = Menubutton(menubar, text='Help',
                             underline=0)
        helpbtn.pack(side=RIGHT)
        helpmenu = Menu(helpbtn, tearoff=0)
        helpbtn['menu'] = helpmenu
	helpmenu.add_command(label='About...',
                             command=self.__popup_about,
                             underline=0)

    def __keepalive(self):
        # Exercise the Python interpreter regularly so keyboard interrupts get
        # through.
        self.__root.tk.createtimerhandler(KEEPALIVE_TIMER, self.__keepalive)

    def __quit(self, event=None):
        sys.exit(0)

    def start(self):
        self.__keepalive()
        self.__root.mainloop()

    def parent(self):
        return self.__root

    def __popup_about(self, event=None):
        tkMessageBox.showinfo('About Pynche 1.0',
                              '''\
Pynche -- the PYthonically
Natural Color and Hue Editor

Copyright (C) 1998
Barry A. Warsaw
All rights reserved

For information about Pynche
contact: Barry A. Warsaw
email:   bwarsaw@python.org''')

    def __popup_text(self, event=None):
        if not self.__textwin:
            from TextViewer import TextViewer
            self.__textwin = TextViewer(self.__sb, self.__root)
            self.__sb.add_view(self.__textwin)
        self.__textwin.deiconify()

    def __popup_listwin(self, event=None):
        if not self.__listwin:
            from ListViewer import ListViewer
            self.__listwin = ListViewer(self.__sb, self.__root)
            self.__sb.add_view(self.__listwin)
        self.__listwin.deiconify()