package org.litesoft.GWT.client.widgets;

import org.litesoft.GWT.client.util.*;

import com.google.gwt.safehtml.shared.*;
import com.google.gwt.user.client.ui.*;

/**
 * A Label that ALWAYS contains something and preserves spaces and escapes all HTML.
 * <p/>
 * Note: while it extends an HTML widget, you may NOT set the HTML, only the text!
 */
public class NeverEmptyHtmlEscapingLabel extends HTML implements StyledSafeTextSink {
    public NeverEmptyHtmlEscapingLabel() {
        this( null );
    }

    public NeverEmptyHtmlEscapingLabel( String text ) {
        setText( text );
    }

    @Override
    public void setText( String text ) {
        super.setHTML( SafeHtmlizer.getInstance().noEmpty1stLine( text ).asString() );
    }

    @Override
    public void setText( String text, Direction dir ) {
        super.setHTML( SafeHtmlizer.getInstance().noEmpty1stLine( text ), dir );
    }

    @Override
    public void setHTML( String html ) {
        unsupported();
    }

    @Override
    public void setHTML( String html, Direction dir ) {
        unsupported();
    }

    @Override
    public void setHTML( SafeHtml html ) {
        unsupported();
    }

    @Override
    public void setHTML( SafeHtml html, Direction dir ) {
        unsupported();
    }

    private void unsupported() {
        throw new UnsupportedOperationException( "setting HTML directly NOT supported on OurLabel - use setText()" );
    }
}