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/*******************************************************************************
* Copyright (c) 2000, 2005 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.compare.examples.xml.ui;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.CLabel;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.RGB;
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 {
public static final RGB RED= new RGB(200, 0, 0);
private static RGB fgDefaultErrorRGB= RED;
private String fMessageText;
private String fErrorText;
private Color fDefaultColor;
private RGB fErrorRGB;
private Color fErrorColor;
/*
* Creates a new message line as a child of the given parent.
* Error message will be shown in <code>RED</code>.
*/
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.
* Error message will be shown in <code>RED</code>.
*/
public MessageLine(Composite parent, int style) {
super(parent, style);
fDefaultColor= getForeground();
fErrorRGB= fgDefaultErrorRGB;
}
/*
* Creates a new message line as a child of the parent and with the given SWT stylebits.
* Error message will be shown with in the given rgb color.
*/
public MessageLine(Composite parent, int style, RGB errorRGB) {
super(parent, style);
fDefaultColor= getForeground();
fErrorRGB= errorRGB;
}
/**
* Clears the currently displayed error message and redisplayes
* the message which was active before the error message was set.
*/
public void clearErrorMessage() {
setErrorMessage(null);
}
/**
* Clears the currently displayed message.
*/
public void clearMessage() {
setMessage(null);
}
/**
* Get the currently displayed error text.
* @return The error message. If no error message is displayed <code>null</code> is returned.
*/
public String getErrorMessage() {
return fErrorText;
}
/**
* Get the currently displayed message.
* @return The message. If no message is displayed <code>null</code> is returned.
*/
public String getMessage() {
return fMessageText;
}
/*
* Sets the default error color used by all message lines.
* Note: a call to this method only affects newly created MessageLines not existing ones.
*/
public static void setDefaultErrorColor(RGB color) {
fgDefaultErrorRGB= color;
}
/*
* 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) {
fErrorText= message;
if (message == null) {
setMessage(fMessageText);
} else {
if (fErrorColor == null) {
fErrorColor= new Color(getDisplay(), fErrorRGB);
}
setForeground(fErrorColor);
setText(message);
}
}
/*
* Set the message text. If the message line currently displays an error,
* the message is stored and will be shown after a call to clearErrorMessage
*/
public void setMessage(String message) {
fMessageText= message;
if (message == null)
message= ""; //$NON-NLS-1$
if (fErrorText == null) {
setForeground(fDefaultColor);
setText(message);
}
}
}
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