build/org.eclipse.cdt.make.ui/src/org/eclipse/cdt/make/internal/ui/MessageLine.java

package org.eclipse.cdt.make.internal.ui;

/*
 * (c) Copyright IBM Corp. 2000, 2001.
 * All Rights Reserved.
 */
 
import org.eclipse.jface.resource.JFaceColors;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.CLabel;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.widgets.Composite;

/**
 * A message line. It distinguishs between "normal" messages and errors. 
 * Setting an error message hides a currently displayed message until 
 * <code>clearErrorMessage</code> is called.
 */
public class MessageLine extends CLabel {

	private String fMessage;

	private Color fNormalMsgAreaBackground;

	/**
	 * Creates a new message line as a child of the given parent.
	 */
	public MessageLine(Composite parent) {
		this(parent, SWT.LEFT);
	}

	/**
	 * Creates a new message line as a child of the parent and with the given SWT stylebits.
	 */
	public MessageLine(Composite parent, int style) {
		super(parent, style);
		fNormalMsgAreaBackground= getBackground();
	}

	
	/**
     * Display the given error message. A currently displayed message
     * is saved and will be redisplayed when the error message is cleared.
     */
	public void setErrorMessage(String message) {
		if (message != null && message.length() > 0) {
			setText(message);
			setImage(MakeUIImages.getImage(MakeUIImages.IMG_OBJS_ERROR));
			setBackground(JFaceColors.getErrorBackground(getDisplay()));
			return;
		}
		setText(fMessage);	
		setImage(null);
		setBackground(fNormalMsgAreaBackground);	
	}

	public void setMessage(String message) {
		fMessage = message;
		setText(message);
	}
}