#!/usr/bin/env python

# TESTED WITH LATEST CLUTTER SVN + CLUTTER PYTHON BINDINGS SVN

# This code illustrates possible bug in Clutter python bindings. This application
# create two Clutter Groups and each Group contains one Actor. First we add Group1
# to the Stage. By pressing X user can remove Group 1 from stage and add Group 2.
# Pressing X again should change Group 1 back to Stage. This seems to fail, because
# Group is now NULL.
#
# But group is an attribute of BugExample class, so it shouldn't be unreferenced
# When removed from stage. I'm not sure is this what happends, but it looks like it.

import clutter

class BugExample:

    def __init__(self):
        # Flag that indicates which group is currently on stage (1 or 2)
        self.current_group = 1

        # Create stage
        self.stage = clutter.stage_get_default()
        self.stage.connect('key-press-event', self.keyPressAction)
        self.stage.set_color(clutter.Color(0x00, 0x00, 0x00, 0xff))
        self.stage.set_size(200,100)
        #self.stage.set_title("Bug Example")

        # Create groups
        self.g1 = clutter.Group()
        self.g2 = clutter.Group()

        # Create actors
        actor1 = clutter.Label()
        actor2 = clutter.Label()
        actor1.set_text("First example text.")
        actor2.set_text("And the second one too.")
        actor1.set_color(clutter.Color(255,255,255,255))
        actor2.set_color(clutter.Color(255,255,255,255))
        actor1.show()
        actor2.show()

        # Add actors to groups
        self.g1.add(actor1)
        self.g2.add(actor2)
        self.g1.show()
        #self.g2.show()

        # Show stage and start clutter loop
        self.stage.add(self.g1)
        self.stage.add(self.g2)
        self.stage.show()
        clutter.main()

    def keyPressAction(self, stage, event):
        # Switch groups on stage (remove one and add the other)
        if event.keyval == clutter.keysyms.x:
            if self.current_group == 1:
                print "Switch from 1 to 2"
                self.current_group = 2
                self.g1.hide()
                #self.stage.remove(self.g1)
                #self.stage.add(self.g2)
                self.g2.show()
            else:
                print "Switch from 2 to 1"
                self.current_group = 1
                self.g2.hide()
                #self.stage.remove(self.g2)
                #self.stage.add(self.g1)
                self.g1.show()

        # Quit application
        elif event.keyval == clutter.keysyms.q or event.keyval == clutter.keysyms.Escape:
            clutter.main_quit()

if __name__ == '__main__':
    BugExample()