"""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.
"""

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
        self.__detailswin = None
        #
        # Is there already a default root for Tk, say because we're running
        # under Guido's IDE? :-) Two conditions say no, either the import
        # fails or _default_root is None.
        tkroot = None
        try:
            from Tkinter import _default_root
            tkroot = self.__tkroot = _default_root
        except ImportError:
            pass
        if not tkroot:
            tkroot = self.__tkroot = Tk(className='Pynche')
        # but this isn't our top level widget, so make it invisible
        tkroot.withdraw()
        # create the menubar
        menubar = self.__menubar = Menu(tkroot)
        #
        # File menu
        #
        filemenu = self.__filemenu = Menu(menubar, tearoff=0)
        filemenu.add_command(label='Quit',
                             command=self.__quit,
                             accelerator='Alt-Q',
                             underline=0)
        #
        # View menu
        #
        viewmenu = Menu(menubar, tearoff=0)
        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)
        viewmenu.add_command(label='Details Window...',
                             command=self.__popup_details,
                             underline=0)
        #
        # Help menu
        #
        helpmenu = Menu(menubar, name='help', tearoff=0)
	helpmenu.add_command(label='About...',
                             command=self.__popup_about,
                             underline=0)
        #
        # Tie them all together
        #
        menubar.add_cascade(label='File',
                            menu=filemenu,
                            underline=0)
        menubar.add_cascade(label='View',
                            menu=viewmenu,
                            underline=0)
        menubar.add_cascade(label='Help',
                            menu=helpmenu,
                            underline=0)

        # now create the top level window
        root = self.__root = Toplevel(tkroot, class_='Pynche', menu=menubar)
        root.protocol('WM_DELETE_WINDOW', self.__quit)
        root.title('Pynche %s' % version)
        root.iconname('Pynche')
        root.tk.createtimerhandler(KEEPALIVE_TIMER, self.__keepalive)
        root.bind('<Alt-q>', self.__quit)
        root.bind('<Alt-Q>', self.__quit)

    def __quit(self, event=None):
        self.__root.quit()

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

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

    def parent(self):
        return self.__root

    def __popup_about(self, event=None):
        from pynche import __version__
        tkMessageBox.showinfo('About Pynche ' + __version__,
                              '''\
Pynche %s
The PYthonically Natural
Color and Hue Editor

Copyright (C) 1998 CNRI
All rights reserved

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

    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()

    def __popup_details(self, event=None):
        if not self.__detailswin:
            from DetailsViewer import DetailsViewer
            self.__detailswin = DetailsViewer(self.__sb, self.__root)
            self.__sb.add_view(self.__detailswin)
        self.__detailswin.deiconify()