#! /usr/bin/python

import clutter, glob, itertools
from gtk import gdk

files = itertools.cycle(glob.glob("/home/ross/Pictures/Desktop/1024x768/*.jpg"))

stage = clutter.stage_get_default()
stage.set_color(clutter.color_parse('Black'))
stage.fullscreen()
stage.set_title('Cluttershow')
def key_press (stage, event):
    if event.keyval == clutter.keysyms.q:
        clutter.main_quit()
        return True
    return False
stage.connect('key-press-event', key_press)
stage.show()

timeline = clutter.Timeline(15, 30) # 15 frames at 30fps
behaviour = clutter.BehaviourOpacity(clutter.Alpha(timeline, clutter.sine_inc_func),
                                     0x00, 0xFF)

def completed(timeline):
    global current_tex, next_tex, behaviour
    
    behaviour.remove_all()
    
    temp = current_tex
    current_tex = next_tex
    next_tex = temp
    next_tex.hide()
    next_tex.set_pixbuf(gdk.pixbuf_new_from_file_at_size(files.next(),
                                                         stage.get_width(),
                                                         stage.get_height()))
timeline.connect("completed", completed)

def swap(stage, event):
    global timeline, behaviour

    # Don't swap if we're already swapping
    if timeline.is_playing():
        return
    
    behaviour.apply(next_tex)
    # Set the default state
    next_tex.raise_top()
    next_tex.set_opacity(0)
    next_tex.show()
    # Start the timeline again
    timeline.rewind()
    timeline.start()
stage.connect('button-press-event', swap)

# The current texture starts blank, so the initial state is just black
current_tex = clutter.Texture()
current_tex.set_position(0, 0)
current_tex.show()
stage.add(current_tex)

# The next texture is the first image we're displaying
pixbuf = gdk.pixbuf_new_from_file_at_size(files.next(),
                                          stage.get_width(),
                                          stage.get_height())
next_tex = clutter.texture_new_from_pixbuf(pixbuf)
next_tex.set_position(0, 0)
stage.add(next_tex)

# Schedule a swap so the first image fades in
swap(stage, None)

clutter.main()