#!/usr/bin/env python
"""
 demo of a GUI with buttons and stuff.
"""

import graphics, threading, time

# -- globals and constants -------------------------
_window = None						# AppWindow object

# -- class definitions ----------------------

class AppWindow(graphics.GraphWin):
	"""application window """
	def __init__(self, title='<title>', width=200, height=200, window=None):
		graphics.GraphWin.__init__(self, title, width, height)

class Button(threading.Thread):
	"""a clickable button"""
	char_height = 14       # estimated character sizes (in pixels)
	char_width = 6
	x_margin = 2           # empty space around text (in pixels)
	y_margin = 2
	animate_time = 1.0     # time interval when something interesting happens
	colors = ('red', 'white', 'blue')
	color_index = 0        # which of colors is currently set
	def __init__(self, title, left, top, command=None, window=None):
		threading.Thread.__init__(self)
		self.window = window
		width = self.char_width*len(title) + 2*self.x_margin
		height = self.char_height + 2*self.y_margin
		top_left = graphics.Point(left, top)
		bot_right = graphics.Point(left + width, top + height)
		midpoint = graphics.Point(left+width/2, top+height/2)
		self.rect = graphics.Rectangle(top_left, bot_right)
		self.text = graphics.Text(midpoint, title)
		self.animating = True
		self.draw()
		# self.start()
	def draw(self, window=None):
		"""Draw this button in the given window or in its default window."""
		if not window: window = self.window
		if window and not self.window: self.window = window
		self.rect.draw(window)
		self.text.draw(window)
	def setFill(self, color):
		self.rect.setFill(color)
	def change_color(self):
		self.color_index = (self.color_index + 1) % len(self.colors)
		self.setFill(self.colors[self.color_index])            # error if not in main thread
	def run(self):
		while self.animating:
			next_animate_time = time.clock() + self.animate_time    # in sec
			print "change color"
			# self.change_color()
			self.rect.move(10,10)
			while time.clock() < next_animate_time:
				continue

# -- main ------------------------------------

print "creating window"
_window = AppWindow(title='GUI demo', width=300, height=300)
print "creating button"
_button = Button(title="make circle", left=20, top=270, window=_window)
input = raw_input('continue? ')
_button.start()
input = raw_input('continue? ')
_button.animating = False