org.eclipse.cdt.internal.cppunit.ui.ProgressImages.java Source code

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Here is the source code for org.eclipse.cdt.internal.cppunit.ui.ProgressImages.java

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/*
 * (c) Copyright IBM Corp. 2003.
 * Created on 27 fvr. 03
 * All Rights Reserved. This program and the accompanying materials
 * are made available under the terms of the Common Public License v0.5
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v05.html
 *
 * Contributors:
 * IBM Software Group - Rational Software
 */

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

import java.net.MalformedURLException;

import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.swt.graphics.Image;

/**
 * Manages a set of images that can show progress in the image itself.
 */
public class ProgressImages {
    static final int PROGRESS_STEPS = 9;

    static final String BASE = "prgss/"; //$NON-NLS-1$
    static final String FAILURE = "ff"; //$NON-NLS-1$
    static final String OK = "ss"; //$NON-NLS-1$

    Image[] fOKImages = new Image[PROGRESS_STEPS];
    Image[] fFailureImages = new Image[PROGRESS_STEPS];
    Image fMissingImage = null;

    void load() {
        if (isLoaded())
            return;

        for (int i = 0; i < PROGRESS_STEPS; i++) {
            String okname = BASE + OK + Integer.toString(i + 1) + ".gif"; //$NON-NLS-1$ 
            fOKImages[i] = createImage(okname);
            String failurename = BASE + FAILURE + Integer.toString(i + 1) + ".gif"; //$NON-NLS-1$ 
            fFailureImages[i] = createImage(failurename);
        }
    }

    Image createImage(String name) {
        try {
            ImageDescriptor id = ImageDescriptor.createFromURL(CppUnitPlugin.makeIconFileURL(name));
            return id.createImage();
        } catch (MalformedURLException e) {
            // fall through
        }
        if (fMissingImage == null)
            fMissingImage = ImageDescriptor.getMissingImageDescriptor().createImage();
        return fMissingImage;
    }

    public void dispose() {
        if (!isLoaded())
            return;

        if (fMissingImage != null)
            fMissingImage.dispose();

        for (int i = 0; i < PROGRESS_STEPS; i++) {
            fOKImages[i].dispose();
            fOKImages[i] = null;
            fFailureImages[i].dispose();
            fFailureImages[i] = null;
        }
    }

    public Image getImage(int current, int total, int errors, int failures) {
        if (!isLoaded())
            load();

        if (total == 0)
            return fOKImages[0];
        int index = ((current * PROGRESS_STEPS) / total) - 1;
        index = Math.min(Math.max(0, index), PROGRESS_STEPS - 1);

        if (errors + failures == 0)
            return fOKImages[index];
        return fFailureImages[index];
    }

    boolean isLoaded() {
        return fOKImages[0] != null;
    }
}