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 int _lastWidth = -1;
  22         private int _lastHeight = -1;
  23         private boolean _loadingImage = false;
  24         private static String _loadingString = null;
  25
  26
  27         /**
  28          * Constructor
  29          */
  30         public PhotoThumbnail()
  31         {
  32                 // TODO: Make size of thumbnail dynamic, as big as it can be
  33                 setOpaque(true);
  34                 _loadingString = I18nManager.getText("details.photo.loading") + " ...";
  35         }
  36
  37
  38         /**
  39          * Set the Photo
  40          * @param inPhoto Photo object to show thumbnail for
  41          */
  42         public void setPhoto(Photo inPhoto)
  43         {
  44                 // Check whether the photo has changed
  45                 if (_photo == inPhoto) {return;}
  46                 _photo = inPhoto;
  47                 _thumbnail = null;
  48         }
  49
  50
  51         /**
  52          * Override paint method
  53          * @see javax.swing.JComponent#paint(java.awt.Graphics)
  54          */
  55         public void paint(Graphics inG)
  56         {
  57                 super.paint(inG);
  58                 if (_photo != null)
  59                 {
  60                         // recalculate thumbnail if photo has changed
  61                         if (_thumbnail == null || getWidth() != _lastWidth || getHeight() != _lastHeight)
  62                         {
  63                                 // initiate load if not already started
  64                                 if (!_loadingImage)
  65                                 {
  66                                         _loadingImage = true;
  67                                         new Thread(this).start();
  68                                 }
  69                         }
  70                         // Set width and height
  71                         _lastWidth = getWidth();
  72                         _lastHeight = getHeight();
  73                         // if loading, display image
  74                         if (_loadingImage)
  75                         {
  76                                 inG.setColor(Color.BLACK);
  77                                 inG.drawString(_loadingString, 10, 30);
  78                         }
  79                         else
  80                         {
  81                                 // Copy scaled, smoothed image onto the screen
  82                                 inG.drawImage(_thumbnail, 0, 0, _thumbnail.getWidth(), _thumbnail.getHeight(), null);
  83                         }
  84                 }
  85         }
  86
  87
  88         /**
  89          * Run method, for loading image in separate thread
  90          * @see java.lang.Runnable#run()
  91          */
  92         public void run()
  93         {
  94                 // Use exif thumbnail?
  95                 if (_photo.getExifThumbnail() != null) {
  96                         Image image = new ImageIcon(_photo.getExifThumbnail()).getImage();
  97                         _thumbnail = ImageUtils.createScaledImage(image, image.getWidth(null), image.getHeight(null));
  98                         image = null;
  99                 }
 100                 else
 101                 {
 102                         // no exif thumbnail available, going to have to read whole thing
 103                         int picWidth = _photo.getWidth();
 104                         int picHeight = _photo.getHeight();
 105                         if (picWidth > -1 && picHeight > -1)
 106                         {
 107                                 int displayWidth = Math.min(getWidth(), getParent().getWidth());
 108                                 // System.out.println("width = " + getWidth() + ", " + getParent().getWidth() + " = " + displayWidth);
 109                                 int displayHeight = Math.min(getHeight(), getParent().getHeight());
 110                                 // System.out.println("height = " + getHeight() + ", " + getParent().getHeight() + " = " + displayHeight);
 111
 112                                 // calculate maximum thumbnail size
 113                                 Dimension thumbSize = ImageUtils.getThumbnailSize(picWidth, picHeight, displayWidth, displayHeight);
 114                                 // Work out if need to remake image
 115                                 boolean needToRemake = (_thumbnail == null)
 116                                  || _thumbnail.getWidth() != thumbSize.width || _thumbnail.getHeight() != thumbSize.height;
 117                                 if (thumbSize.width > 0 && thumbSize.height > 0 && needToRemake)
 118                                 {
 119                                         // Make icon to load image into
 120                                         Image image = new ImageIcon(_photo.getFile().getAbsolutePath()).getImage();
 121                                         // save scaled, smoothed thumbnail for reuse
 122                                         _thumbnail = ImageUtils.createScaledImage(image, thumbSize.width, thumbSize.height);
 123                                         image = null;
 124                                         // TODO: Calculate and set size of thumbnail here
 125                                         // setPreferredSize(new Dimension(200, 200));
 126                                 }
 127                         }
 128                 }
 129                 _loadingImage = false;
 130                 repaint();
 131         }
 132 }