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package com.explodingpixels.macwidgets;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Point;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import javax.swing.BorderFactory;
import javax.swing.ImageIcon;
import javax.swing.JPanel;
/**
* This editor panel emulates iTunes Star rating editor functionality
* @author Paul Connolly paulcconnolly gmail
*/
public class RatingStarEditorPanel
extends JPanel
implements MouseListener, MouseMotionListener {
public RatingStarEditorPanel() {
setBorder(BorderFactory.createLineBorder(Color.BLACK, 1));
repaint();
}
private int lastX = Integer.MIN_VALUE;
private int lastY = Integer.MIN_VALUE;
private int xoffset = 5; //these offsets are there for display purposes, to position the stars correctly
private int yoffset = 2;
public void mouseClicked(MouseEvent e) {
processCoordinates(e);
repaint();
}
/**
* keep track of the last mouse position.
*
* @param e
*/
private void recordCoordinates(MouseEvent e) {
lastX = e.getX();
lastY = e.getY();
}
/**
* Before recording coordinates, we have to make sure that they fall in the right range.
*
* @param e
* @return
*/
private boolean validateCoordinates(MouseEvent e) {
Point location = getLocation();
Dimension size = getSize();
if (e.getX() < location.getX() || e.getX() > location.getX() + size.getWidth()) {
return false;
}
if (e.getY() < location.getY() || e.getY() > location.getY() + size.getHeight()) {
return false;
}
return true;
}
public void mousePressed(MouseEvent e) {
processCoordinates(e);
repaint();
}
private void processCoordinates(MouseEvent e) {
if (e != null) {
if (validateCoordinates(e)) {
recordCoordinates(e);
}
}
}
public void mouseReleased(MouseEvent e) {
processCoordinates(e);
repaint();
}
public void mouseEntered(MouseEvent e) {
}
public void mouseExited(MouseEvent e) {
}
/**
* Calculate the level between 0-5. This correlates to the star rating system.
*
* @return
*/
public int getLevel() {
if (lastX == Integer.MIN_VALUE || lastY == Integer.MIN_VALUE) {
return 0;
}
int min = (int) getLocation().getX();
int max = min + (int) getSize().getWidth();
//essentially, calculate a percentile for what section of this component the mouse
//is positioned within.
return (int) Math.ceil(((double) (lastX - min) / (max - min)) * 5);
}
@Override
protected void paintComponent(Graphics g) {
Graphics2D g2 = ((Graphics2D) g);
Image star = new ImageIcon(ITunesRatingTableCellRenderer.class.getResource(
"/com/explodingpixels/macwidgets/images/itunes_star_unselected.png")).getImage();
int level = getLevel();
g2.clearRect(0, 0, getWidth(), getHeight());
for (int i = 0; i < level; i++) {
g2.drawImage(star, (i * star.getWidth(null)) + xoffset, yoffset, null, null);
}
}
public void mouseDragged(MouseEvent e) {
processCoordinates(e);
repaint();
}
public void mouseMoved(MouseEvent e) {
//To change body of implemented methods use File | Settings | File Templates.
}
}
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