// This Source Code is in the Public Domain per: http://unlicense.org
package org.litesoft.GWT.client.widgets;

import org.litesoft.commonfoundation.typeutils.*;

import com.google.gwt.user.client.*;

/**
 * Allows resizing to be delayed until resize activity stops for the
 * specified period.
 */
public abstract class ResizeHelper {
    private int mMsDelay;

    private Timer mTimer = null;

    public ResizeHelper() {
        this( 333 );
    }

    public ResizeHelper( int pMsDelay ) {
        setMsDelay( pMsDelay );
    }

    public int getMsDelay() {
        return mMsDelay;
    }

    public void setMsDelay( int pMsDelay ) {
        mMsDelay = Integers.assertNonNegative( "pMsDelay", pMsDelay );
    }

    public void onResized() {
        if ( mMsDelay == 0 ) {
            doResize();
        } else {
            if ( mTimer == null ) {
                mTimer = new Timer() {
                    @Override
                    public void run() {
                        doResize();
                        mTimer = null;
                    }
                };
            }
            mTimer.schedule( mMsDelay );
        }
    }

    protected abstract void doResize();

    @Override
    public String toString() {
        return "delay=" + mMsDelay + ",timerRunning=" + Boolean.valueOf( mTimer != null );
    }
}