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// $Id$
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/**
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* Copyright (C) 2007 EDIT
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* European Distributed Institute of Taxonomy
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* http://www.e-taxonomy.eu
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*
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* The contents of this file are subject to the Mozilla Public License Version 1.1
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* See LICENSE.TXT at the top of this package for the full license terms.
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*/
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package eu.etaxonomy.taxeditor.ui.element;
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import java.io.IOException;
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import java.io.InputStream;
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import java.net.URI;
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import org.apache.http.HttpException;
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import org.eclipse.core.runtime.IProgressMonitor;
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import org.eclipse.core.runtime.IStatus;
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import org.eclipse.core.runtime.Status;
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import org.eclipse.core.runtime.jobs.Job;
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import org.eclipse.jface.operation.IRunnableWithProgress;
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import org.eclipse.swt.events.PaintEvent;
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import org.eclipse.swt.events.PaintListener;
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import org.eclipse.swt.graphics.GC;
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import org.eclipse.swt.graphics.Image;
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import org.eclipse.swt.graphics.Rectangle;
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import org.eclipse.swt.widgets.Composite;
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import org.eclipse.swt.widgets.Control;
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import org.eclipse.swt.widgets.Display;
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import org.eclipse.swt.widgets.Event;
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import org.eclipse.ui.forms.widgets.TableWrapData;
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import eu.etaxonomy.cdm.common.UriUtils;
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import eu.etaxonomy.taxeditor.model.AbstractUtility;
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import eu.etaxonomy.taxeditor.model.MessagingUtils;
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/**
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* @author n.hoffmann
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* @created Sep 24, 2010
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* @version 1.0
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*/
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public class ImageElement extends AbstractCdmFormElement implements PaintListener{
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private URI imageUri;
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private Image image;
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private Composite container;
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private final Runnable postRunnable = new Runnable(){
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@Override
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public void run() {
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AbstractUtility.reflowDetailsViewer();
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AbstractUtility.reflowSupplementalViewer();
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}
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};
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protected ImageElement(CdmFormFactory formFactory, ICdmFormElement parentElement, URI imageUri, int style) {
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super(formFactory, parentElement);
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container = new Composite(getLayoutComposite(), style);
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container.setLayoutData(LayoutConstants.FILL(2, 1));
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container.addPaintListener(this);
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}
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public void initImageUri(URI uri) throws IOException, HttpException {
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this.imageUri = uri;
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InputStream imageStream = UriUtils.getInputStream(imageUri);
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image = new Image(Display.getCurrent(), imageStream);
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}
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public URI getImageUri() {
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return imageUri;
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}
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public void loadImage(){
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if(getImageUri() != null){
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Job job = new Job("Loading image") {
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@Override
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protected IStatus run(IProgressMonitor monitor) {
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IRunnableWithProgress runnable = getLoadImageRunnable(postRunnable);
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try {
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runnable.run(monitor);
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} catch (Exception e) {
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MessagingUtils.messageDialog("Could not load image", getClass(), e.getMessage() + ": " + getImageUri(), e);
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}
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return Status.OK_STATUS;
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}
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};
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job.schedule();
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}
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}
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public void unloadImage() {
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Job job = new Job("Unloading image") {
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@Override
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protected IStatus run(IProgressMonitor monitor) {
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IRunnableWithProgress runnable = getLoadImageRunnable(postRunnable);
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try {
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runnable.run(monitor);
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} catch (Exception e) {
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MessagingUtils.messageDialog("Could not unload image", getClass(), e.getMessage() + ": " + getImageUri(), e);
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}
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return Status.OK_STATUS;
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}
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};
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job.schedule();
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}
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public IRunnableWithProgress getLoadImageRunnable(final Runnable postRunnable){
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final Display display = getLayoutComposite().getDisplay();
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IRunnableWithProgress runnable = new IRunnableWithProgress(){
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@Override
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public void run(IProgressMonitor monitor) {
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monitor.beginTask("Loading: " + getImageUri(), IProgressMonitor.UNKNOWN);
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// redraw the image container
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display.asyncExec(new Runnable(){
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@Override
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public void run() {
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if(! getLayoutComposite().isDisposed() && container!=null){
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Event untypedEvent = new Event();
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untypedEvent.widget = container;
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PaintEvent event = new PaintEvent(untypedEvent);
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event.gc = new GC(container);
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paintControl(event);
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getLayoutComposite().layout();
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}
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}
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});
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// execute the external runnable
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if(postRunnable != null){
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display.asyncExec(postRunnable);
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}
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monitor.done();
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}
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};
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return runnable;
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}
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private Rectangle calculateImageBounds(Image image, Control control){
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Rectangle imageBounds = image.getBounds();
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Rectangle containerBounds = control.getBounds();
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Integer imgWidth = imageBounds.width;
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Integer imgHeight = imageBounds.height;
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Float ratio = imgHeight.floatValue()/imgWidth.floatValue();
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Integer width = containerBounds.width;
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Integer height = ((Float) (width * ratio)).intValue();
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return new Rectangle(containerBounds.x, containerBounds.y, width, height);
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}
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public void dispose(){
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if(image!=null){
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image.dispose();
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image = null;
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}
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imageUri = null;
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if(container!=null){
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container.dispose();
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container = null;
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}
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}
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/** {@inheritDoc} */
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@Override
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public void paintControl(PaintEvent e) {
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TableWrapData layoutData = LayoutConstants.FILL(2, 1);
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Control control = (Control) e.widget;
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if(image != null){
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Rectangle imageMaxBounds = calculateImageBounds(image, control);
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layoutData.heightHint = imageMaxBounds.height;
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e.gc.drawImage(image, 0, 0, image.getBounds().width, image.getBounds().height, 0, 0, imageMaxBounds.width, imageMaxBounds.height);
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}else{
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layoutData.heightHint = 10;
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e.gc.drawRectangle(0, 0, 0, 10);
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}
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control.setLayoutData(layoutData);
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e.gc.dispose();
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}
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}
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