org.eclipse.epp.internal.mpc.ui.util.Util.java Source code

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Here is the source code for org.eclipse.epp.internal.mpc.ui.util.Util.java

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/*******************************************************************************
 * Copyright (c) 2010 The Eclipse Foundation 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:
 *    The Eclipse Foundation - initial API and implementation
 *******************************************************************************/
package org.eclipse.epp.internal.mpc.ui.util;

import org.eclipse.core.runtime.IStatus;
import org.eclipse.jface.dialogs.IMessageProvider;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Rectangle;

public class Util {
    /**
     * Scale an image to a size that conforms to the given maximums while maintaining its original aspect ratio.
     * 
     * @param image
     *            the image to scale
     * @param maxWidth
     *            the maximum width of the new image
     * @param maxHeight
     *            the maximum height of the new image
     * @return a new image, which must be disposed by the caller.
     */
    public static Image scaleImage(Image image, int maxWidth, int maxHeight) {
        // scale the image using native scaling
        // and maintain aspect ratio
        Rectangle bounds = image.getBounds();
        int newHeight;
        int newWidth;
        float widthRatio = ((float) bounds.width) / maxWidth;
        float heightRatio = ((float) bounds.height) / maxHeight;
        if (widthRatio > heightRatio) {
            newWidth = maxWidth;
            newHeight = Math.min(maxHeight, (int) (bounds.height / widthRatio));
        } else {
            newWidth = Math.min(maxWidth, (int) (bounds.width / heightRatio));
            newHeight = maxHeight;
        }
        final Image scaledImage = new Image(image.getDevice(), newWidth, newHeight);
        GC gc = new GC(scaledImage);
        try {
            gc.drawImage(image, 0, 0, bounds.width, bounds.height, 0, 0, newWidth, newHeight);
        } finally {
            gc.dispose();
        }
        return scaledImage;
    }

    /**
     * Compute the message type of the given status.
     * 
     * @see IMessageProvider
     */
    public static int computeMessageType(IStatus status) {
        int messageType;
        switch (status.getSeverity()) {
        case IStatus.OK:
        case IStatus.INFO:
            messageType = IMessageProvider.INFORMATION;
            break;
        case IStatus.WARNING:
            messageType = IMessageProvider.WARNING;
            break;
        default:
            messageType = IMessageProvider.ERROR;
            break;
        }
        return messageType;
    }
}