/*******************************************************************************
* Copyright (c) 2000, 2006 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.jface.dialogs;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.StackLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.ProgressBar;
/**
* A control for showing progress feedback for a long running operation. This
* control supports both determinate and indeterminate SWT progress bars. For
* indeterminate progress, we don't have to know the total amount of work in
* advance and no <code>worked</code> method needs to be called.
*/
public class ProgressIndicator extends Composite {
private final static int PROGRESS_MAX = 1000; // value to use for max in
// progress bar
private boolean animated = true;
private StackLayout layout;
private ProgressBar determinateProgressBar;
private ProgressBar indeterminateProgressBar;
private double totalWork;
private double sumWorked;
/**
* Create a ProgressIndicator as a child under the given parent.
*
* @param parent
* The widgets parent
*/
public ProgressIndicator(Composite parent) {
super(parent, SWT.NULL);
determinateProgressBar = new ProgressBar(this, SWT.HORIZONTAL);
indeterminateProgressBar = new ProgressBar(this, SWT.HORIZONTAL
| SWT.INDETERMINATE);
layout = new StackLayout();
setLayout(layout);
}
/**
* Initialize the progress bar to be animated.
*/
public void beginAnimatedTask() {
done();
layout.topControl = indeterminateProgressBar;
layout();
animated = true;
}
/**
* Initialize the progress bar.
*
* @param max
* The maximum value.
*/
public void beginTask(int max) {
done();
this.totalWork = max;
this.sumWorked = 0;
determinateProgressBar.setMinimum(0);
determinateProgressBar.setMaximum(PROGRESS_MAX);
determinateProgressBar.setSelection(0);
layout.topControl = determinateProgressBar;
layout();
animated = false;
}
/**
* Progress is done.
*/
public void done() {
if (!animated) {
determinateProgressBar.setMinimum(0);
determinateProgressBar.setMaximum(0);
determinateProgressBar.setSelection(0);
}
layout.topControl = null;
layout();
}
/**
* Moves the progress indicator to the end.
*/
public void sendRemainingWork() {
worked(totalWork - sumWorked);
}
/**
* Moves the progress indicator by the given amount of work units
* @param work the amount of work to increment by.
*/
public void worked(double work) {
if (work == 0 || animated) {
return;
}
sumWorked += work;
if (sumWorked > totalWork) {
sumWorked = totalWork;
}
if (sumWorked < 0) {
sumWorked = 0;
}
int value = (int) (sumWorked / totalWork * PROGRESS_MAX);
if (determinateProgressBar.getSelection() < value) {
determinateProgressBar.setSelection(value);
}
}
}