com.borlander.rac525791.dashboard.layout.data.DashboardImagesImpl.java Source code

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Here is the source code for com.borlander.rac525791.dashboard.layout.data.DashboardImagesImpl.java

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/*
 *    Debrief - the Open Source Maritime Analysis Application
 *    http://debrief.info
 *
 *    (C) 2000-2014, PlanetMayo Ltd
 *
 *    This library is free software; you can redistribute it and/or
 *    modify it under the terms of the Eclipse Public License v1.0
 *    (http://www.eclipse.org/legal/epl-v10.html)
 *
 *    This library is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
 */
package com.borlander.rac525791.dashboard.layout.data;

import java.util.HashMap;

import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.Display;
import org.mwc.asset.vesselmonitor.Activator;

import com.borlander.rac525791.dashboard.layout.DashboardImages;

/**
 * The very simple implementation similar to
 * org.eclipse.jface.resource.ImageRegistry class.
 * 
 * (Written to avoid dependency on jface.resource)
 */
class DashboardImagesImpl implements DashboardImages {
    private static final String CONTROLS = "controls.png";

    private static final String CIRCLES = "circles.png";

    private static final String NUMBERS = "text.png";

    private final String myControlsPath;

    private final String myCirclesPath;

    private final String myNumbersPath;

    private final Display myDisplay;

    private final HashMap<String, Image> myImages = new HashMap<String, Image>();

    public DashboardImagesImpl(Display display, String folder, boolean preload) {
        myControlsPath = folder + "/" + CONTROLS;
        myCirclesPath = folder + "/" + CIRCLES;
        myNumbersPath = folder + "/" + NUMBERS;

        myDisplay = display;
        myDisplay.disposeExec(new Runnable() {
            public void run() {
                DashboardImagesImpl.this.dispose();
            }
        });

        if (preload) {
            getNumbers();
            getCircleLids();
            getControls();
        }
    }

    public void dispose() {
        for (Image next : myImages.values()) {
            if (next != null && !next.isDisposed()) {
                next.dispose();
            }
        }
        myImages.clear();
    }

    public Image getNumbers() {
        return getImage(myNumbersPath);
    }

    public Image getCircleLids() {
        return getImage(myCirclesPath);
    }

    public Image getControls() {
        return getImage(myControlsPath);
    }

    private Image getImage(String filePath) {
        Image result = myImages.get(filePath);
        if (result == null || result.isDisposed()) {
            // XXX: Strange, but it does not always work for png images
            // Issues with alpha channel were found
            // result = new Image(myDisplay, filePath);

            ImageDescriptor desc = Activator.getImageDescriptor(filePath);
            //         ImageLoader loader = new ImageLoader();
            //         loader.load(filePath);
            //         result = new Image(myDisplay, loader.data[0]);
            result = desc.createImage();
            myImages.put(filePath, result);
        }
        return result;
    }
}