nichrome-timer.5c

/*
 * Copyright © 2012 Keith Packard <keithp@keithp.com>
 *
 * 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; version 2 of the License.
 *
 * 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, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 */

autoload Nichrome;
autoload Mutex;

extend namespace Nichrome {
	public namespace Timer {

		public typedef widget_t + struct {
			Mutex::mutex		lock;
			bool			running;
			bool			visible;
			int			end;
			thread			timer;
		} timer_t;

		void draw (cairo_t cr, &timer_t widget) {
			if (!widget.visible)
				return;
			real	left;
			if (widget.running) {
				left = (widget.end - millis()) / 1000;

				if (left < 0)
					left = 0;
				if (left > 60)
					left = 60;
			} else
				left = 0;
			real filled = 60 - left;
			save (cr);
			scale (cr, widget.geometry.width / 2, widget.geometry.height / 2);
			move_to (cr, 1, 1);
			arc (cr,
			     1, 1,				/* center */
			     0.9,				/* radius */
			     - π / 2,				/* start angle */
			     2 * π * (filled) / 60.0 - π/2);	/* end angle */
			close_path (cr);
			set_source_rgba (cr, 0.0, 0.0, 0.0, 0.5);
			fill (cr);
			restore (cr);
		}

		void run_timer (&timer_t widget) {
			twixt(Mutex::acquire(widget.lock); Mutex::release(widget.lock)) {
				try {
					while ((int now = millis()) <= widget.end) {
						int	delay = (widget.end - now) % 100;
						if (delay == 0)
							delay = 100;
						twixt(Mutex::release(widget.lock); Mutex::acquire(widget.lock)) {
							sleep(delay);
							Widget::redraw(&widget);
						}
					}
				} catch Thread::signal (int sig) {
				}
				widget.running = false;
			}
		}

		void start_timer (&timer_t widget) {
			twixt(Mutex::acquire(widget.lock); Mutex::release(widget.lock)) {
			}
		}

		protected void set_timer (&timer_t widget, real time) {
			twixt(Mutex::acquire(widget.lock); Mutex::release(widget.lock)) {
				widget.visible = true;
				widget.end = millis() + floor (time * 1000 + 0.5);
				if (!widget.running) {
					widget.running = true;
					widget.timer = fork run_timer(&widget);
				}
			}
		}

		protected void stop_timer (&timer_t widget) {
			widget.end = millis();
			twixt(Mutex::acquire(widget.lock); Mutex::release(widget.lock)) {
				if (widget.running)
					Thread::send_signal(widget.timer, 0);
			}
		}

		protected void hide(&timer_t widget) {
			widget.visible = false;
		}

		protected void show(&timer_t widget) {
			widget.visible = true;
		}

		void outline (cairo_t cr, &timer_t widget) {
			rectangle(cr, 0, 0, 0, 0);
		}

		void natural (cairo_t cr, &timer_t widget) {
			rectangle(cr, 0, 0, 100, 100);
		}

		protected void init(*nichrome_t nichrome, &timer_t widget) {
			Widget::init(nichrome, &widget);
			widget.draw = draw;
			widget.outline = outline;
			widget.natural = natural;
			widget.lock = Mutex::new();
			widget.running = false;
			widget.visible = false;
		}

		protected *timer_t new(*nichrome_t nichrome) {
			&timer_t	widget = &(timer_t) {};

			init(nichrome, &widget);
			return &widget;
		}
	}
}