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package hu.kazocsaba.imageviewer;
import java.awt.Color;
import java.awt.Insets;
import java.awt.image.BufferedImage;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import javax.swing.BorderFactory;
import javax.swing.JComponent;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
/**
* A status bar implementation that display information based on a pixel of the image. Call the
* {@link #setPixel(int, int)} function to specify which pixel it should display. The current implementation shows
* the position and color of the pixel; override {@link #updateLabel(java.awt.image.BufferedImage, int, int, int)} to
* customize this information.
* @author Kazó Csaba
*/
public class PixelInfoStatusBar extends StatusBar {
private final JPanel statusBar;
/** The label displaying the info text. */
protected final JLabel label;
private final Insets statusBarInsets;
private PixelModel model;
private PropertyChangeListener propertyChangeListener=new PropertyChangeListener() {
@Override
public void propertyChange(PropertyChangeEvent evt) {
update();
}
};
private final ChangeListener modelListener=new ChangeListener() {
@Override
public void stateChanged(ChangeEvent e) {
update();
}
};
/**
* Creates a new instance.
*/
public PixelInfoStatusBar() {
statusBar = new JPanel();
statusBar.setBorder(BorderFactory.createEtchedBorder());
label = new JLabel("n/a");
statusBar.add(label);
statusBarInsets=statusBar.getInsets();
setModel(new PixelModel());
}
/**
* Sets the model dictating the pixel shown by this status bar.
*
* @param newModel the new model
* @throws NullPointerException if {@code newModel} is {@code null}
*/
public final void setModel(PixelModel newModel) {
if (newModel == null) throw new NullPointerException();
if (model != newModel) {
if (model != null)
model.removeChangeListener(modelListener);
model = newModel;
model.addChangeListener(modelListener);
update();
}
}
/**
* Returns the model storing the pixel shown by this status bar.
* @return the current model; never {@code null}
*/
public PixelModel getModel() {
return model;
}
@Override
public final JComponent getComponent() {
return statusBar;
}
/**
* Sets the pixel this status bar is to display information on. The values may be arbitrary; you can use negative
* values to indicate that there is nothing to display.
* @param x the x coordinate of the pixel
* @param y the y coordinate of the pixel
*/
public void setPixel(int x, int y) {
model.set(x, y);
}
/**
* Updates the info label. This function is called when either the selected pixel
* or the image shown in the viewer is changed. You can call this method to indicate
* that the message should be updated for some different reason.
*/
protected final void update() {
BufferedImage image=getImageViewer()==null ? null : getImageViewer().getImage();
if (image==null || model.isInvalid() || model.getX()>=image.getWidth() || model.getY()>=image.getHeight())
updateLabelNoData();
else
updateLabel(image, model.getX(), model.getY(), statusBar.getWidth()-statusBarInsets.left-statusBarInsets.right);
}
/**
* This function updates the contents of the {@link #label} to indicate that no data can be shown. By default,
* this function is called by {@code update} when the image is {@code null} or the pixel to be shown is not within
* bounds.
*/
protected void updateLabelNoData() {
label.setText("n/a");
}
/**
* This function updates the contents of the {@link #label}. It is called when the highlighted pixel or the image changes,
* and only when the image is not {@code null} and the pixel is within the bounds of the image. If either of these
* conditions aren't true, the {@code update} function calls {@link #updateLabelNoData()} instead.
* Override it to provide a custom message.
* @param image the current image displayed in the viewer
* @param x the x coordinate of the pixel that should be displayed
* @param y the y coordinate of the pixel that should be displayed
* @param availableWidth the maximum label width that can be displayed; you can use this parameter to specify a shorter
* message if there is not enough room
*/
protected void updateLabel(BufferedImage image, int x, int y, int availableWidth) {
if (image.getRaster().getNumBands()==1) {
label.setText(String.format("%d, %d; intensity %d", x, y,
image.getRaster().getSample(x, y, 0)));
} else if (image.getRaster().getNumBands()==4) {
int rgb = image.getRGB(x, y);
Color c = new Color(rgb, true);
label.setText(String.format("%d, %d; color %d,%d,%d, alpha %d", x, y,
c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()));
} else {
int rgb = image.getRGB(x, y);
Color c = new Color(rgb);
label.setText(String.format("%d, %d; color %d,%d,%d", x, y,
c.getRed(), c.getGreen(), c.getBlue()));
}
if (availableWidth
