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
   9 import javax.swing.ImageIcon;
  10 import javax.swing.JPanel;
  11
  12 import tim.prune.I18nManager;
  13 import tim.prune.data.Photo;
  14
  15 /**
  16  * GUI component for showing photo thumbnail
  17  */
  18 public class PhotoThumbnail extends JPanel implements Runnable
  19 {
  20         private Photo _photo = null;
  21         private BufferedImage _thumbnail = null;
  22         private int _lastWidth = -1;
  23         private int _lastHeight = -1;
  24         private boolean _loadingImage = false;
  25         private static String _loadingString = null;
  26
  27
  28         /**
  29          * Constructor
  30          */
  31         public PhotoThumbnail()
  32         {
  33                 // TODO: Make size of thumbnail dynamic, as big as it can be
  34                 setOpaque(true);
  35                 _loadingString = I18nManager.getText("details.photo.loading") + " ...";
  36         }
  37
  38
  39         /**
  40          * Set the Photo
  41          * @param inPhoto Photo object to show thumbnail for
  42          */
  43         public void setPhoto(Photo inPhoto)
  44         {
  45                 // Check whether the photo has changed
  46                 if (_photo == inPhoto) {return;}
  47                 _photo = inPhoto;
  48                 _thumbnail = null;
  49         }
  50
  51
  52         /**
  53          * Override paint method
  54          * @see javax.swing.JComponent#paint(java.awt.Graphics)
  55          */
  56         public void paint(Graphics inG)
  57         {
  58                 super.paint(inG);
  59                 if (_photo != null)
  60                 {
  61                         // recalculate thumbnail if photo has changed
  62                         if (_thumbnail == null || getWidth() != _lastWidth || getHeight() != _lastHeight)
  63                         {
  64                                 // initiate load if not already started
  65                                 if (!_loadingImage)
  66                                 {
  67                                         _loadingImage = true;
  68                                         new Thread(this).start();
  69                                 }
  70                         }
  71                         // Set width and height
  72                         _lastWidth = getWidth();
  73                         _lastHeight = getHeight();
  74                         // if loading, display image
  75                         if (_loadingImage)
  76                         {
  77                                 inG.setColor(Color.BLACK);
  78                                 inG.drawString(_loadingString, 10, 30);
  79                         }
  80                         else
  81                         {
  82                                 // Copy scaled, smoothed image onto the screen
  83                                 inG.drawImage(_thumbnail, 0, 0, _thumbnail.getWidth(), _thumbnail.getHeight(), null);
  84                         }
  85                 }
  86         }
  87
  88
  89         /**
  90          * Run method, for loading image in separate thread
  91          * @see java.lang.Runnable#run()
  92          */
  93         public void run()
  94         {
  95                 int picWidth = _photo.getWidth();
  96                 int picHeight = _photo.getHeight();
  97                 if (picWidth > -1 && picHeight > -1)
  98                 {
  99                         int displayWidth = Math.min(getWidth(), getParent().getWidth());
 100                         // System.out.println("width = " + getWidth() + ", " + getParent().getWidth() + " = " + displayWidth);
 101                         int displayHeight = Math.min(getHeight(), getParent().getHeight());
 102                         // System.out.println("height = " + getHeight() + ", " + getParent().getHeight() + " = " + displayHeight);
 103
 104                         // calculate maximum thumbnail size
 105                         Dimension thumbSize = ImageUtils.getThumbnailSize(picWidth, picHeight, displayWidth, displayHeight);
 106                         // Work out if need to remake image
 107                         boolean needToRemake = (_thumbnail == null)
 108                          || _thumbnail.getWidth() != thumbSize.width || _thumbnail.getHeight() != thumbSize.height;
 109                         if (thumbSize.width > 0 && thumbSize.height > 0 && needToRemake)
 110                         {
 111                                 // Make icon to load image into
 112                                 Image image = new ImageIcon(_photo.getFile().getAbsolutePath()).getImage();
 113                                 // save scaled, smoothed thumbnail for reuse
 114                                 _thumbnail = ImageUtils.createScaledImage(image, thumbSize.width, thumbSize.height);
 115                                 image = null;
 116                                 // TODO: Calculate and set size of thumbnail here
 117                                 // setPreferredSize(new Dimension(200, 200));
 118                         }
 119                 }
 120                 _loadingImage = false;
 121                 repaint();
 122         }
 123 }