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  * @author n.hoffmann
  39  * @created Sep 24, 2010
  40  * @version 1.0
  41  */
  42 public class ImageElement extends AbstractCdmFormElement implements PaintListener{
  43
  44         private URI imageUri;
  45         private Image image;
  46
  47         private Composite container;
  48
  49         protected ImageElement(CdmFormFactory formFactory, ICdmFormElement parentElement, URI imageUri, int style) {
  50                 super(formFactory, parentElement);
  51
  52                 container = new Composite(getLayoutComposite(), style);
  53                 container.setLayoutData(LayoutConstants.FILL(2, 1));
  54
  55                 container.addPaintListener(this);
  56         }
  57
  58         public void initImageUri(URI uri) throws IOException, HttpException {
  59                 this.imageUri = uri;
  60                 InputStream imageStream = UriUtils.getInputStream(imageUri);
  61                 image = new Image(Display.getCurrent(), imageStream);
  62         }
  63
  64
  65         public URI getImageUri() {
  66                 return imageUri;
  67         }
  68
  69         public void loadImage(){
  70                 loadImage(null);
  71         }
  72
  73         public void loadImage(final Runnable postRunnable){
  74                 if(getImageUri() != null){
  75                         Job job = new Job("Loading image") {
  76
  77                                 @Override
  78                                 protected IStatus run(IProgressMonitor monitor) {
  79                                         IRunnableWithProgress runnable = getLoadImageRunnable(postRunnable);
  80                                         try {
  81                                                 runnable.run(monitor);
  82                                         } catch (Exception e) {
  83                                                 MessagingUtils.messageDialog("Could not load image", getClass(), e.getMessage()  + ": " +  getImageUri(), e);
  84                                         }
  85
  86                                         return Status.OK_STATUS;
  87                                 }
  88                         };
  89                         job.schedule();
  90                 }
  91         }
  92
  93         public void unloadImage(final Runnable postRunnable) {
  94                 Job job = new Job("Unloading image") {
  95
  96                         @Override
  97                         protected IStatus run(IProgressMonitor monitor) {
  98                                 IRunnableWithProgress runnable = getLoadImageRunnable(postRunnable);
  99                                 try {
 100                                         runnable.run(monitor);
 101                                 } catch (Exception e) {
 102                                         MessagingUtils.messageDialog("Could not unload image", getClass(), e.getMessage()  + ": " +  getImageUri(), e);
 103                                 }
 104
 105                                 return Status.OK_STATUS;
 106                         }
 107                 };
 108                 job.schedule();
 109
 110         }
 111
 112         public IRunnableWithProgress getLoadImageRunnable(final Runnable postRunnable){
 113
 114                 final Display display = getLayoutComposite().getDisplay();
 115
 116                 IRunnableWithProgress runnable = new IRunnableWithProgress(){
 117
 118                         @Override
 119                         public void run(IProgressMonitor monitor) {
 120                                 monitor.beginTask("Loading: " + getImageUri(), IProgressMonitor.UNKNOWN);
 121
 122                                 // redraw the image container
 123                                 display.asyncExec(new Runnable(){
 124                                         @Override
 125                                         public void run() {
 126                                                 if(! getLayoutComposite().isDisposed()){
 127                                                         Event untypedEvent = new Event();
 128                                                         untypedEvent.widget = container;
 129                                                         PaintEvent event = new PaintEvent(untypedEvent);
 130                                                         event.gc = new GC(container);
 131                                                         paintControl(event);
 132                                                         getLayoutComposite().layout();
 133                                                 }
 134                                         }
 135                                 });
 136
 137                                 // execute the external runnable
 138                                 if(postRunnable != null){
 139                                         display.asyncExec(postRunnable);
 140                                 }
 141                                 monitor.done();
 142                         }
 143
 144                 };
 145
 146                 return runnable;
 147         }
 148
 149         private Rectangle calculateImageBounds(Image image, Control control){
 150                 Rectangle imageBounds = image.getBounds();
 151                 Rectangle containerBounds = control.getBounds();
 152
 153                 Integer imgWidth = imageBounds.width;
 154                 Integer imgHeight = imageBounds.height;
 155
 156                 Float ratio = imgHeight.floatValue()/imgWidth.floatValue();
 157                 Integer width = containerBounds.width;
 158                 Integer height = ((Float) (width * ratio)).intValue();
 159
 160                 return new Rectangle(containerBounds.x, containerBounds.y, width, height);
 161         }
 162
 163         /** {@inheritDoc} */
 164         @Override
 165         public void paintControl(PaintEvent e) {
 166                 TableWrapData layoutData = LayoutConstants.FILL(2, 1);
 167                 Control control = (Control) e.widget;
 168                 if(image != null){
 169                         Rectangle imageMaxBounds = calculateImageBounds(image, control);
 170                         layoutData.heightHint = imageMaxBounds.height;
 171                         e.gc.drawImage(image, 0, 0, image.getBounds().width, image.getBounds().height, 0, 0, imageMaxBounds.width, imageMaxBounds.height);
 172                 }else{
 173                         layoutData.heightHint = 10;
 174                         e.gc.drawRectangle(0, 0, 0, 10);
 175                 }
 176                 control.setLayoutData(layoutData);
 177                 e.gc.dispose();
 178         }
 179
 180 }