timer.java

模仿windows的扫雷游戏 SWT编写的 需要log4j 1.2.4

package cn.pandaoen.game.minesweeper;

import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;

import cn.pandaoen.widget.swt.LedDigit;

/**
 * The instance of this class records the time
 * after starting of a game.
 * 
 * @author pan
 */
public class Timer extends Counter {

	private long base;
	private int offset;
	private boolean running;
	private Runnable runnable;

	static final int PERIOD = 500;

	public Timer(Composite parent, int style) {
		super(parent, style);

		final Display display = getDisplay();
		runnable = new Runnable() {
			public void run() {
				if (isDisposed())
					return;
				long time = System.currentTimeMillis();
				setValue(offset + (int) (time - base) / 1000);
				display.timerExec(PERIOD, this);
			}
		};
	}

	public boolean isRunning() {
		checkWidget();
		return running;
	}

	public void reset() {
		checkWidget();
		base = System.currentTimeMillis();
		offset = 0;
		setValue(0);
	}

	public void start() {
		checkWidget();
		if (running)
			return;
		base = System.currentTimeMillis();
		running = true;
		Display display = getDisplay();
		display.timerExec(0, runnable);
	}

	public void stop() {
		checkWidget();
		if (!running)
			return;
		offset = getValue();
		running = false;
		Display display = getDisplay();
		display.timerExec(-1, runnable);
	}

	@Override
	protected LedDigit getLedDigit() {
		if (ledDigit == null) {
			Display display = getDisplay();
			ledDigit = new LedDigit(display, display
					.getSystemColor(SWT.COLOR_GREEN), display
					.getSystemColor(SWT.COLOR_BLACK), display
					.getSystemColor(SWT.COLOR_DARK_GREEN));
		}

		return ledDigit;
	}
}