title = 'Demonstration of how to create a megawidget'

# Import Pmw from this directory tree.
import sys
sys.path[:0] = ['../../..']

import Tkinter
import Pmw

class TextDisplay(Pmw.MegaWidget):

    # Demo Pmw megawidget.

    def __init__(self, parent = None, **kw):

	# Define the megawidget options.
	optiondefs = ()
	self.defineoptions(kw, optiondefs)

	# Initialise the base class (after defining the options).
	Pmw.MegaWidget.__init__(self, parent)

	# Create the components.
	interior = self.interior()

	self._text = self.createcomponent('text',
		(), None,
		Tkinter.Text, (interior,), state = 'disabled')
	self._text.pack(side='left', fill='both', expand='yes')

	self._scrollbar = self.createcomponent('scrollbar',
		(), None,
		Tkinter.Scrollbar, (interior,), command = self._text.yview)
	self._scrollbar.pack(side='right', fill='y')
	self._text.configure(yscrollcommand = self._scrollbar.set)

	# Check keywords and initialise options.
	self.initialiseoptions()

    def display(self, info):
	self._text.configure(state = 'normal')
	self._text.delete('1.0', 'end')
	self._text.insert('1.0', info)
	self._text.configure(state = 'disabled')

    def append(self, info):
	self._text.configure(state = 'normal')
	self._text.insert('end', info)
	self._text.configure(state = 'disabled')

class Demo:
    def __init__(self, parent):
	# Create and pack the megawidget.
	text = TextDisplay(parent,
		text_background = 'aliceblue',
		text_width = 40,
		text_height = 10,
		text_wrap = 'none',
	)
	text.pack(fill = 'both', expand = 1)
	text.display('This is an example of a simple Pmw megawidget.\n\n' +
		'Public attributes of the Tkinter module:\n\n')
	for name in dir(Tkinter):
	    if name[0] != '_':
		text.append('    ' + name + '\n')

######################################################################

# Create demo in root window for testing.
if __name__ == '__main__':
    root = Tkinter.Tk()
    Pmw.initialise(root)
    root.title(title)

    exitButton = Tkinter.Button(root, text = 'Exit', command = root.destroy)
    exitButton.pack(side = 'bottom')
    widget = Demo(root)
    root.mainloop()
