import time, gobject, gtk

class TreeTips:
	timeout = None
	widget = None
	item = None
	time = 0

	def show(self, parent):
		if self.timeout:
			gobject.source_remove(self.timeout)
			self.timeout = None

		if self.widget:
			self.widget.destroy()
			self.widget = None

		if self.item is None:
			return

		text = self.get_tooltip_text(self.item)
		if not text:
			return

		self.widget = gtk.Window(gtk.WINDOW_POPUP)
		self.widget.set_app_paintable(True)
		self.widget.set_name('gtk-tooltips')

		self.widget.connect('expose-event', self.tooltip_draw)

		label = gtk.Label(text)
		label.set_line_wrap(True)
		label.set_padding(4, 2)
		self.widget.add(label)
		label.show()

		w, h = self.widget.size_request()
		if hasattr(parent, 'get_screen'):
			screen = parent.get_screen()
			root = screen.get_root_window()
		else:
			root = gtk.gdk.get_default_root_window()
		px, py, mask = gtk.gdk.Window.get_pointer(root)

		#m = gtk.gdk.screen_get_default().get_monitor_at_point(px, py)
		
		x = px - w / 2
		y = py + 12

		# Test if pointer is over the tooltip window
		if py >= y and py <= y + h:
			y = py - h - 2
		self.widget.move(x, y)
		self.widget.show()

		self.widget.connect('destroy', self.tooltip_destroyed)
		self.time = time.time()
	
	def prime(self, parent, item):
		self.hide()
		assert self.timeout is None
		self.item = item
	
		now = time.time()
		if now - self.time > 2:
			delay = 1000
		else:
			delay = 100

		self.timeout = gobject.timeout_add(delay, lambda: self.show(parent))

	def tooltip_draw(self, widget, ev):
		widget.window.draw_rectangle(widget.style.fg_gc[widget.state],
					False, 0, 0,
					widget.allocation.width - 1,
					widget.allocation.height - 1)

	def tooltip_destroyed(self, widget):
		pass
	
	def hide(self):
		self.item = None
		self.show(None)
	
	def get_tooltip_text(self, item):
		"Override in subclasses."
		return str(item)