#!/usr/bin/env python
#================================================================
# fontselector: Test driver for FontSelect
#
# For documentation, see:
#   http://www.nmt.edu/tcc/help/lang/python/examples/fontselect/
#----------------------------------------------------------------

from Tkinter import *
import tkFont
import fontselect

class Application(Frame):
    """GUI for fontselector

      State/Invariants:
        .fontSelect:  [ self's FontSelect widget ]
    """

    def __init__ ( self ):
        """Constructor for the Application class.
        """
        Frame.__init__ ( self, None )
        self.buttonFont = tkFont.Font ( family="Helvetica", size=20 )
        self.grid ( padx=5, pady=5 )
        self.__createWidgets()

    def __createWidgets ( self ):
        """Lay out the widgets.
        """
        self.fontSelect  =  fontselect.FontSelect ( self,
            listCount=10,
            observer=self.__callback )
        self.fontSelect.grid ( row=0, column=0, padx=5, pady=5 )

        self.quitButton  =  Button ( self, text="Quit",
            font=self.buttonFont,
            command=self.quit )
        self.quitButton.grid ( row=1, column=0, columnspan=99,
            sticky=E+W, ipadx=5, ipady=5 )

    def __callback ( self, font ):
        """Observer for font changes.

          [ sys.stdout  +:=  current font name from self.fontSelect ]
        """
        print "Change to:", self.fontSelect.getName()
#================================================================
# Main program
#----------------------------------------------------------------

app  =  Application()
app.master.title ( "fontselector" )
app.mainloop()