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

import org.litesoft.commonfoundation.typeutils.*;

import java.util.*;

public class StatusBar
{
    private static Stack<String> sMessages = new Stack<String>();

    public static void remove( String pText )
    {
        if ( (pText != null) && sMessages.remove( pText ) )
        {
            refresh();
        }
    }

    public static void add( String pText )
    {
        if ( pText != null )
        {
            if ( sMessages.isEmpty() )
            {
                sMessages.push( pText );
            }
            else if ( !pText.equals( sMessages.peek() ) )
            {
                sMessages.remove( pText );
                sMessages.push( pText );
            }
            refresh();
        }
    }

    public static void refresh()
    {
        set( sMessages.isEmpty() ? " " : sMessages.peek() );
    }

    public static void prepend( String pText, String pSep )
    {
        if ( pText != null )
        {
            String zExistingText = Strings.noEmpty( get() );
            if ( zExistingText != null )
            {
                pText = Strings.trimToLength( Strings.deNull( pSep ) + zExistingText, 80, "..." );
            }
            set( pText );
        }
    }

    public static native void set( String pText )/*-{
        $wnd.status = pText;
    }-*/;

    public static native String get()/*-{
        return $wnd.status;
    }-*/;
}