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

import java.io.*;

public enum Overflow implements Serializable
{
    Scrolled
            {
                public Overflow mergeWith( Overflow pThem )
                {
                    return this;
                }

                public boolean isScrolled()
                {
                    return true;
                }
            },
    Clipped
            {
                public Overflow mergeWith( Overflow pThem )
                {
                    return Scrolled.equals( pThem ) ? pThem : this;
                }

                public boolean isClipped()
                {
                    return true;
                }
            },
    None
            {
                public Overflow mergeWith( Overflow pThem )
                {
                    return ((pThem == null) || (None.equals( pThem ))) ? this : pThem;
                }

                public boolean isNone()
                {
                    return true;
                }
            };

    public static final long serialVersionUID = 1L;

    public static Overflow deNull( Overflow pOverflow )
    {
        return (pOverflow != null) ? pOverflow : None;
    }

    abstract public Overflow mergeWith( Overflow pThem );

    public boolean isScrolledOrClipped()
    {
        return isScrolled() || isClipped();
    }

    public boolean isScrolled()
    {
        return false;
    }

    public boolean isClipped()
    {
        return false;
    }

    public boolean isNone()
    {
        return false;
    }
}