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/*
* Copyright © 2010 Yuvaraj Pandian T <yuvipanda@yuvi.in>
* Copyright © 2010 daniel g. siegel <dgsiegel@gnome.org>
* Copyright © 2008 Filippo Argiolas <filippo.argiolas@gmail.com>
*
* Licensed under the GNU General Public License Version 2
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
internal class Cheese.Countdown : GLib.Object
{
public delegate void CountdownCallback ();
private Clutter.Text countdown_actor;
private unowned CountdownCallback completed_callback;
private Clutter.PropertyTransition pulse_in;
private Clutter.PropertyTransition pulse_out;
private int current_value = 0;
private GLib.Settings settings;
public bool running;
public Countdown (Clutter.Text countdown_actor)
{
this.countdown_actor = countdown_actor;
settings = new GLib.Settings("org.gnome.Cheese");
}
~Countdown ()
{
stop ();
}
/**
* Fade the countdown text out, over 500 milliseconds.
*
* Once the fade-out is complete, this method calls fade_in().
*/
private void fade_out ()
{
pulse_out = new Clutter.PropertyTransition ("opacity");
pulse_out.set_duration (500);
pulse_out.set_from_value (255);
pulse_out.set_to_value (0);
pulse_out.completed.connect (fade_in);
pulse_out.animatable = countdown_actor;
pulse_out.start ();
}
/**
* Decrement the countdown text and fade it in, over 500 milliseconds.
*
* Once the fade-in is complete, this method calls fade_out().
*/
private void fade_in ()
{
if (this.current_value <= 0)
{
this.completed_callback ();
running = false;
return;
}
this.countdown_actor.text = this.current_value.to_string ();
this.current_value--;
pulse_in = new Clutter.PropertyTransition ("opacity");
pulse_in.set_duration (500);
pulse_in.set_from_value (0);
pulse_in.set_to_value (255);
pulse_in.completed.connect (fade_out);
pulse_in.animatable = countdown_actor;
pulse_in.start ();
}
/**
* Start the countdown, using the countdown-duration GSetting for the time.
*
* @param completed_callback the callback to call upon countdown completion
*/
public void start (CountdownCallback completed_callback)
{
this.completed_callback = completed_callback;
this.current_value = settings.get_int("countdown-duration");
running = true;
countdown_actor.show ();
fade_in ();
}
/**
* Stop the countdown, for example if it was interrupted by the user.
*/
public void stop ()
{
countdown_actor.hide ();
countdown_actor.remove_all_transitions ();
running = false;
}
}
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