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