eu.etaxonomy.taxeditor.store/src/main/java/eu/etaxonomy/taxeditor/ui/element/ImageElement.java

   1 // $Id$
   2 /**
   3 * Copyright (C) 2007 EDIT
   4 * European Distributed Institute of Taxonomy
   5 * http://www.e-taxonomy.eu
   6 *
   7 * The contents of this file are subject to the Mozilla Public License Version 1.1
   8 * See LICENSE.TXT at the top of this package for the full license terms.
   9 */
  10
  11 package eu.etaxonomy.taxeditor.ui.element;
  12
  13 import java.io.IOException;
  14 import java.io.InputStream;
  15 import java.net.URI;
  16
  17 import org.apache.http.HttpException;
  18 import org.eclipse.core.runtime.IProgressMonitor;
  19 import org.eclipse.core.runtime.IStatus;
  20 import org.eclipse.core.runtime.Status;
  21 import org.eclipse.core.runtime.jobs.Job;
  22 import org.eclipse.jface.operation.IRunnableWithProgress;
  23 import org.eclipse.swt.events.PaintEvent;
  24 import org.eclipse.swt.events.PaintListener;
  25 import org.eclipse.swt.graphics.GC;
  26 import org.eclipse.swt.graphics.Image;
  27 import org.eclipse.swt.graphics.Rectangle;
  28 import org.eclipse.swt.widgets.Composite;
  29 import org.eclipse.swt.widgets.Control;
  30 import org.eclipse.swt.widgets.Display;
  31 import org.eclipse.swt.widgets.Event;
  32 import org.eclipse.ui.forms.widgets.TableWrapData;
  33
  34 import eu.etaxonomy.cdm.common.UriUtils;
  35 import eu.etaxonomy.taxeditor.model.MessagingUtils;
  36
  37 /**
  38  * <p>ImageElement class.</p>
  39  *
  40  * @author n.hoffmann
  41  * @created Sep 24, 2010
  42  * @version 1.0
  43  */
  44 public class ImageElement extends AbstractCdmFormElement implements PaintListener{
  45
  46         private URI imageUri;
  47         private Image image;
  48
  49         private Composite container;
  50
  51         /**
  52          * <p>Constructor for ImageElement.</p>
  53          *
  54          * @param formFactory a {@link eu.etaxonomy.taxeditor.ui.element.CdmFormFactory} object.
  55          * @param parentElement a {@link eu.etaxonomy.taxeditor.ui.element.ICdmFormElement} object.
  56          * @param imageUri a {@link java.net.URI} object.
  57          * @param style a int.
  58          */
  59         protected ImageElement(CdmFormFactory formFactory, ICdmFormElement parentElement, URI imageUri, int style) {
  60                 super(formFactory, parentElement);
  61
  62                 container = new Composite(getLayoutComposite(), style);
  63                 container.setLayoutData(LayoutConstants.FILL(2, 1));
  64
  65                 container.addPaintListener(this);
  66         }
  67
  68         /**
  69          * <p>Setter for the field <code>imageUri</code>.</p>
  70          *
  71          * @param uri a {@link java.net.URI} object.
  72          * @throws HttpException
  73          * @throws IOException
  74          */
  75         public void initImageUri(URI uri) throws IOException, HttpException {
  76                 this.imageUri = uri;
  77                 InputStream imageStream = UriUtils.getInputStream(imageUri);
  78                 image = new Image(Display.getCurrent(), imageStream);
  79         }
  80
  81
  82         /**
  83          * <p>Getter for the field <code>imageUri</code>.</p>
  84          *
  85          * @return the imageUri
  86          */
  87         public URI getImageUri() {
  88                 return imageUri;
  89         }
  90
  91         public void loadImage(){
  92                 loadImage(null);
  93         }
  94
  95
  96
  97         public void loadImage(final Runnable postRunnable){
  98                 if(getImageUri() != null){
  99                         Job job = new Job("Loading image") {
 100
 101                                 @Override
 102                                 protected IStatus run(IProgressMonitor monitor) {
 103                                         IRunnableWithProgress runnable = getLoadImageRunnable(postRunnable);
 104                                         try {
 105                                                 runnable.run(monitor);
 106                                         } catch (Exception e) {
 107                                                 MessagingUtils.messageDialog("Could not load image", getClass(), e.getMessage()  + ": " +  getImageUri(), e);
 108                                         }
 109
 110                                         return Status.OK_STATUS;
 111                                 }
 112                         };
 113                         job.schedule();
 114                 }
 115         }
 116
 117
 118
 119         public void unloadImage(final Runnable postRunnable) {
 120                 Job job = new Job("Unloading image") {
 121
 122                         @Override
 123                         protected IStatus run(IProgressMonitor monitor) {
 124                                 IRunnableWithProgress runnable = getLoadImageRunnable(postRunnable);
 125                                 try {
 126                                         runnable.run(monitor);
 127                                 } catch (Exception e) {
 128                                         MessagingUtils.messageDialog("Could not unload image", getClass(), e.getMessage()  + ": " +  getImageUri(), e);
 129                                 }
 130
 131                                 return Status.OK_STATUS;
 132                         }
 133                 };
 134                 job.schedule();
 135
 136         }
 137
 138         public IRunnableWithProgress getLoadImageRunnable(final Runnable postRunnable){
 139
 140                 final Display display = getLayoutComposite().getDisplay();
 141
 142                 IRunnableWithProgress runnable = new IRunnableWithProgress(){
 143
 144                         @Override
 145                         public void run(IProgressMonitor monitor) {
 146                                 monitor.beginTask("Loading: " + getImageUri(), IProgressMonitor.UNKNOWN);
 147
 148                                 // redraw the image container
 149                                 display.asyncExec(new Runnable(){
 150                                         @Override
 151                                         public void run() {
 152                                                 if(! getLayoutComposite().isDisposed()){
 153                                                         Event untypedEvent = new Event();
 154                                                         untypedEvent.widget = container;
 155                                                         PaintEvent event = new PaintEvent(untypedEvent);
 156                                                         event.gc = new GC(container);
 157                                                         paintControl(event);
 158                                                         getLayoutComposite().layout();
 159                                                 }
 160                                         }
 161                                 });
 162
 163                                 // execute the external runnable
 164                                 if(postRunnable != null){
 165                                         display.asyncExec(postRunnable);
 166                                 }
 167                                 monitor.done();
 168                         }
 169
 170                 };
 171
 172                 return runnable;
 173         }
 174
 175         private Rectangle calculateImageBounds(Image image, Control control){
 176                 Rectangle imageBounds = image.getBounds();
 177                 Rectangle containerBounds = control.getBounds();
 178
 179                 Integer imgWidth = imageBounds.width;
 180                 Integer imgHeight = imageBounds.height;
 181
 182                 Float ratio = imgHeight.floatValue()/imgWidth.floatValue();
 183                 Integer width = containerBounds.width;
 184                 Integer height = ((Float) (width * ratio)).intValue();
 185
 186                 return new Rectangle(containerBounds.x, containerBounds.y, width, height);
 187         }
 188
 189
 190         /* (non-Javadoc)
 191          * @see org.eclipse.swt.events.PaintListener#paintControl(org.eclipse.swt.events.PaintEvent)
 192          */
 193         /** {@inheritDoc} */
 194         @Override
 195         public void paintControl(PaintEvent e) {
 196                 TableWrapData layoutData = LayoutConstants.FILL(2, 1);
 197                 Control control = (Control) e.widget;
 198                 if(image != null){
 199                         Rectangle imageMaxBounds = calculateImageBounds(image, control);
 200                         layoutData.heightHint = imageMaxBounds.height;
 201                         e.gc.drawImage(image, 0, 0, image.getBounds().width, image.getBounds().height, 0, 0, imageMaxBounds.width, imageMaxBounds.height);
 202                 }else{
 203                         layoutData.heightHint = 10;
 204                         e.gc.drawRectangle(0, 0, 0, 10);
 205                 }
 206                 control.setLayoutData(layoutData);
 207                 e.gc.dispose();
 208         }
 209
 210 }