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package tim.prune.gui;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Image;
import javax.swing.ImageIcon;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import tim.prune.I18nManager;
import tim.prune.data.Photo;
/**
* GUI component for showing photo thumbnail
*/
public class PhotoThumbnail extends JPanel implements Runnable
{
private Photo _photo = null;
private Image _thumbnail = null;
private boolean _loadingImage = false;
private boolean _loadFailed = false;
private boolean _inPanel = false;
/** String to show before photo is loaded */
private static final String LOADING_STRING = I18nManager.getText("details.photo.loading") + " ...";
/**
* Constructor
*/
public PhotoThumbnail()
{
this(true);
}
/**
* Constructor
* @param inPanel true if thumbnail is inside panel
*/
public PhotoThumbnail(boolean inPanel)
{
setOpaque(true);
_inPanel = inPanel;
}
/**
* Set the Photo
* @param inPhoto Photo object to show thumbnail for
*/
public void setPhoto(Photo inPhoto)
{
// Check whether the photo has changed
if (_photo != inPhoto)
{
_photo = inPhoto;
_thumbnail = null;
_loadFailed = false;
}
repaint();
}
/**
* Force a refresh / reload
*/
public void refresh()
{
_thumbnail = null;
_loadFailed = false;
}
/**
* Override paint method
* @see javax.swing.JComponent#paint(java.awt.Graphics)
*/
public void paint(Graphics inG)
{
super.paint(inG);
if (_photo != null)
{
// read thumbnail in separate thread
if (_thumbnail == null && !_loadingImage && !_loadFailed)
{
_loadingImage = true;
new Thread(this).start();
}
// if loading, display message
if (_loadingImage)
{
inG.setColor(Color.BLACK);
inG.drawString(LOADING_STRING, 10, 30);
}
else if (_thumbnail != null && !_loadFailed)
{
// Copy scaled, smoothed (and rotated) image into scaled
int usableWidth = getParent().getWidth()-10;
int usableHeight = (_inPanel?usableWidth:getHeight()-10);
Image scaled = ImageUtils.rotateImage(_thumbnail, usableWidth, usableHeight, _photo.getRotationDegrees());
int scaleWidth = scaled.getWidth(null);
int scaleHeight = scaled.getHeight(null);
// Draw scaled / rotated image to component
int horizOffset = (getWidth() - scaleWidth) / 2;
int vertOffset = (getHeight() - scaleHeight) / 2;
inG.drawImage(scaled, horizOffset, vertOffset, scaleWidth, scaleHeight, null);
// Special resize behaviour when locked inside details panel
if (_inPanel && (getHeight() < getWidth() || getHeight() > usableWidth))
{
Dimension newsize = new Dimension(usableWidth, usableWidth);
setPreferredSize(newsize);
setSize(newsize);
invalidate();
// Schedule a relayout because the size has changed
SwingUtilities.invokeLater(new Runnable() {
public void run() {
try {Thread.sleep(200);} catch (InterruptedException e) {}
getParent().getParent().getParent().validate();
}
});
}
}
}
}
/**
* Run method, for loading image in separate thread
* @see java.lang.Runnable#run()
*/
public void run()
{
if (_inPanel)
{
// use either exif thumbnail or photo scaled down to sensible size
if (_photo.getExifThumbnail() != null) {
// Use exif thumbnail
Image image = new ImageIcon(_photo.getExifThumbnail()).getImage();
_thumbnail = ImageUtils.createScaledImage(image, image.getWidth(null), image.getHeight(null));
image = null;
}
else
{
// no exif thumbnail available, going to have to read whole thing
int picWidth = _photo.getWidth();
int picHeight = _photo.getHeight();
if (picWidth > -1 && picHeight > -1)
{
// Just set a "reasonable" thumbnail size for now
final int DEFAULT_THUMB_SIZE = 400;
// calculate maximum thumbnail size
Dimension thumbSize = ImageUtils.getThumbnailSize(picWidth, picHeight, DEFAULT_THUMB_SIZE, DEFAULT_THUMB_SIZE);
// Make icon to load image into
Image image = _photo.createImageIcon().getImage();
// save scaled, smoothed thumbnail for reuse
_thumbnail = ImageUtils.createScaledImage(image, thumbSize.width, thumbSize.height);
image = null;
}
else _loadFailed = true;
}
}
else {
_thumbnail = _photo.createImageIcon().getImage();
}
_loadingImage = false;
repaint();
}
}
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