tim/prune/gui/PhotoThumbnail.java

   1 package tim.prune.gui;
   2
   3 import java.awt.Color;
   4 import java.awt.Dimension;
   5 import java.awt.Graphics;
   6 import java.awt.Image;
   7 import java.awt.image.BufferedImage;
   8 import javax.swing.ImageIcon;
   9 import javax.swing.JPanel;
  10
  11 import tim.prune.I18nManager;
  12 import tim.prune.data.Photo;
  13
  14 /**
  15  * GUI component for showing photo thumbnail
  16  */
  17 public class PhotoThumbnail extends JPanel implements Runnable
  18 {
  19         private Photo _photo = null;
  20         private BufferedImage _thumbnail = null;
  21         private boolean _loadingImage = false;
  22         /** String to show before photo is loaded */
  23         private static final String LOADING_STRING = I18nManager.getText("details.photo.loading") + " ...";
  24
  25
  26         /**
  27          * Constructor
  28          */
  29         public PhotoThumbnail()
  30         {
  31                 setOpaque(true);
  32         }
  33
  34
  35         /**
  36          * Set the Photo
  37          * @param inPhoto Photo object to show thumbnail for
  38          */
  39         public void setPhoto(Photo inPhoto)
  40         {
  41                 // Check whether the photo has changed
  42                 if (_photo != inPhoto) {
  43                         _photo = inPhoto;
  44                         _thumbnail = null;
  45                 }
  46                 repaint();
  47         }
  48
  49         /**
  50          * Force a refresh / reload
  51          */
  52         public void refresh() {
  53                 _thumbnail = null;
  54         }
  55
  56         /**
  57          * Override paint method
  58          * @see javax.swing.JComponent#paint(java.awt.Graphics)
  59          */
  60         public void paint(Graphics inG)
  61         {
  62                 super.paint(inG);
  63                 if (_photo != null)
  64                 {
  65                         // read thumbnail in separate thread
  66                         if (_thumbnail == null && !_loadingImage)
  67                         {
  68                                 _loadingImage = true;
  69                                 new Thread(this).start();
  70                         }
  71                         // if loading, display message
  72                         if (_loadingImage)
  73                         {
  74                                 inG.setColor(Color.BLACK);
  75                                 inG.drawString(LOADING_STRING, 10, 30);
  76                         }
  77                         else
  78                         {
  79                                 // Copy scaled, smoothed (and rotated) image into scaled
  80                                 int usableWidth = getParent().getWidth()-10;
  81                                 Image scaled = ImageUtils.rotateImage(_thumbnail, usableWidth, usableWidth, _photo.getRotationDegrees());
  82                                 int scaleWidth = scaled.getWidth(null);
  83                                 int scaleHeight = scaled.getHeight(null);
  84                                 // Draw scaled / rotated image to component
  85                                 int horizOffset = (getWidth() - scaleWidth) / 2;
  86                                 int vertOffset = (getHeight() - scaleHeight) / 2;
  87                                 inG.drawImage(scaled, horizOffset, vertOffset, scaleWidth, scaleHeight, null);
  88                                 if (getHeight() < getWidth())
  89                                 {
  90                                         setPreferredSize(new Dimension(usableWidth, usableWidth));
  91                                         invalidate();
  92                                 }
  93                         }
  94                 }
  95         }
  96
  97
  98         /**
  99          * Run method, for loading image in separate thread
 100          * @see java.lang.Runnable#run()
 101          */
 102         public void run()
 103         {
 104                 // Use exif thumbnail?
 105                 if (_photo.getExifThumbnail() != null) {
 106                         Image image = new ImageIcon(_photo.getExifThumbnail()).getImage();
 107                         _thumbnail = ImageUtils.createScaledImage(image, image.getWidth(null), image.getHeight(null));
 108                         image = null;
 109                 }
 110                 else
 111                 {
 112                         // no exif thumbnail available, going to have to read whole thing
 113                         int picWidth = _photo.getWidth();
 114                         int picHeight = _photo.getHeight();
 115                         if (picWidth > -1 && picHeight > -1)
 116                         {
 117                                 // Just set a "reasonable" thumbnail size for now
 118                                 final int DEFAULT_THUMB_SIZE = 400;
 119                                 // calculate maximum thumbnail size
 120                                 Dimension thumbSize = ImageUtils.getThumbnailSize(picWidth, picHeight, DEFAULT_THUMB_SIZE, DEFAULT_THUMB_SIZE);
 121                                 // Make icon to load image into
 122                                 Image image = new ImageIcon(_photo.getFile().getAbsolutePath()).getImage();
 123                                 // save scaled, smoothed thumbnail for reuse
 124                                 _thumbnail = ImageUtils.createScaledImage(image, thumbSize.width, thumbSize.height);
 125                                 image = null;
 126                         }
 127                 }
 128                 _loadingImage = false;
 129                 repaint();
 130         }
 131 }