com.extjs.gxt.ui.client.util.DelayedTask.java Source code

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Here is the source code for com.extjs.gxt.ui.client.util.DelayedTask.java

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/*
 * Sencha GXT 2.3.1 - Sencha for GWT
 * Copyright(c) 2007-2013, Sencha, Inc.
 * licensing@sencha.com
 * 
 * http://www.sencha.com/products/gxt/license/
 */
package com.extjs.gxt.ui.client.util;

import com.extjs.gxt.ui.client.event.Listener;
import com.google.gwt.user.client.Timer;

/**
 * A <code>Timer</code> that is cancelled if a new request is made.
 */
public class DelayedTask {

    private Timer timer;
    private Listener<?> listener;

    /**
     * Creates a new delayed task.
     * 
     * @param listener the listener to be called
     */
    public DelayedTask(final Listener<?> listener) {
        this.listener = listener;
        timer = new Timer() {
            public void run() {
                DelayedTask.this.listener.handleEvent(null);
            }
        };
    }

    /**
     * Cancels the task.
     */
    public void cancel() {
        timer.cancel();
    }

    /**
     * Cancels any running timers and starts a new one.
     * 
     * @param delay the delay in ms
     */
    public void delay(int delay) {
        timer.cancel();
        if (delay > 0) {
            timer.schedule(delay);
        } else {
            timer.run();
        }
    }

}