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/*******************************************************************************
* Copyright (c) 2000, 2008 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.ui.texteditor;
import org.eclipse.swt.graphics.Image;
import org.eclipse.core.runtime.Assert;
import org.eclipse.jface.action.IStatusLineManager;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.ISelectionProvider;
import org.eclipse.jface.viewers.SelectionChangedEvent;
/**
* An editor status line.
* The selection provider of the editor triggers the status line to be cleared.
* @since 2.1
*/
class EditorStatusLine implements IEditorStatusLine {
/**
* Clears the status line on selection changed.
*/
private class StatusLineClearer implements ISelectionChangedListener {
@Override
public void selectionChanged(SelectionChangedEvent event) {
fStatusLineManager.setErrorMessage(null, null);
fStatusLineManager.setMessage(null, null);
Assert.isTrue(this == fStatusLineClearer);
uninstallStatusLineClearer();
}
}
/** The status line manager. */
private final IStatusLineManager fStatusLineManager;
/** The selection provider. */
private final ISelectionProvider fSelectionProvider;
/** The status line clearer, <code>null</code> if not installed. */
private StatusLineClearer fStatusLineClearer;
/**
* Constructor for EditorStatusLine.
*
* @param statusLineManager the status line manager
* @param selectionProvider the selection provider
*/
public EditorStatusLine(IStatusLineManager statusLineManager, ISelectionProvider selectionProvider) {
Assert.isNotNull(statusLineManager);
Assert.isNotNull(selectionProvider);
fStatusLineManager= statusLineManager;
fSelectionProvider= selectionProvider;
}
/**
* Returns the status line manager.
*
* @return the status line manager
*/
public IStatusLineManager getStatusLineManager() {
return fStatusLineManager;
}
/**
* Returns the selection provider.
*
* @return the selection provider
*/
public ISelectionProvider getSelectionProvider() {
return fSelectionProvider;
}
@Override
public void setMessage(boolean error, String message, Image image) {
if (error)
fStatusLineManager.setErrorMessage(image, message);
else {
// Clear error message
fStatusLineManager.setErrorMessage(null, null);
fStatusLineManager.setMessage(image, message);
}
if (isMessageEmpty(message))
uninstallStatusLineClearer();
else
installStatusLineClearer();
}
/**
* Returns whether this given string is empty.
*
* @param message a string
* @return <code>true</code> if the string is <code>null</code>, has 0 length or only white space characters.
*/
private static boolean isMessageEmpty(String message) {
return message == null || message.trim().length() == 0;
}
/**
* Uninstalls the status line clearer.
*/
private void uninstallStatusLineClearer() {
if (fStatusLineClearer == null)
return;
fSelectionProvider.removeSelectionChangedListener(fStatusLineClearer);
fStatusLineClearer= null;
}
/**
* Installs the status line clearer.
*/
private void installStatusLineClearer() {
if (fStatusLineClearer != null)
return;
StatusLineClearer statusLineClearer= new StatusLineClearer();
fSelectionProvider.addSelectionChangedListener(statusLineClearer);
fStatusLineClearer= statusLineClearer;
}
}
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