es.deusto.weblab.client.ui.widgets.WlWaitingLabel.java Source code

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Here is the source code for es.deusto.weblab.client.ui.widgets.WlWaitingLabel.java

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/*
* Copyright (C) 2005 onwards University of Deusto
* All rights reserved.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution.
*
* This software consists of contributions made by many individuals, 
* listed below:
*
* Author: Pablo Ordua <pablo@ordunya.com>
*
*/
package es.deusto.weblab.client.ui.widgets;

import com.google.gwt.user.client.Timer;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.Widget;

// TODO: I've made WlWaitingLabel extend Label so that it can be used with
// UIBinder. Consider alternatives. (I've tried overloading
// WlVerticalPanel's Add(), but it is ambiguous, because quite a few
// types (such as WlVerticalPanel itself) seem to be both a 
// Widget and a IWlWidget.

public class WlWaitingLabel extends Label implements IWlWidget {

    private static final int MOVING_TIME = 500;
    private static final int MAX_DOTS = 3;

    //private final Label label = this;
    private String realText;
    private boolean running;
    private int counter;
    private Timer currentTimer = null;

    public WlWaitingLabel() {
        this.running = false;
        //this.label = new Label();
        this.counter = 0;
    }

    public WlWaitingLabel(String text) {
        this();
        this.setText(text);
    }

    @Override
    public void setText(String text) {
        this.realText = text;
        this.counter = 0;
        this.showText(text);
    }

    private void showText(String text) {
        super.setText(text);
    }

    @Override
    public String getText() {
        return this.realText;
    }

    public void start() {
        this.running = true;
        this.queueProcessingDots();
    }

    private void processDots() {
        WlWaitingLabel.this.counter++;
        if (WlWaitingLabel.this.counter > WlWaitingLabel.MAX_DOTS)
            WlWaitingLabel.this.counter = 0;

        String dots = "";
        for (int i = 0; i < WlWaitingLabel.this.counter; ++i)
            dots += ".";

        final String visibleText = this.realText + dots;
        this.showText(visibleText);

        this.queueProcessingDots();
    }

    private void queueProcessingDots() {
        this.currentTimer = new Timer() {
            @Override
            public void run() {
                if (WlWaitingLabel.this.running)
                    WlWaitingLabel.this.processDots();
            }
        };
        this.currentTimer.schedule(WlWaitingLabel.MOVING_TIME);
    }

    public void stop() {
        if (this.running) {
            if (this.currentTimer != null)
                this.currentTimer.cancel();

            this.currentTimer = null;
            this.running = false;
        }
    }

    @Override
    public Widget getWidget() {
        return this;
    }

    @Override
    public void dispose() {
        this.stop();
    }
}