ColorChooserMenu.java Source code

Introduction

Here is the source code for ColorChooserMenu.java

Source

import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
import java.util.Hashtable;

import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JPanel;
import javax.swing.MenuSelectionManager;
import javax.swing.border.BevelBorder;
import javax.swing.border.Border;
import javax.swing.border.CompoundBorder;
import javax.swing.border.EmptyBorder;
import javax.swing.border.MatteBorder;

public class ColorChooserMenu extends JFrame {

    public ColorChooserMenu() {
        super("Color Chooser Menu");
        setSize(450, 350);

        JMenuBar menuBar = createMenuBar();
        setJMenuBar(menuBar);

        WindowListener wndCloser = new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        };
        addWindowListener(wndCloser);

        setVisible(true);
    }

    protected JMenuBar createMenuBar() {
        final JMenuBar menuBar = new JMenuBar();

        ColorMenu cm = new ColorMenu("Foreground");
        cm.setMnemonic('f');
        ActionListener lst = new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                ColorMenu m = (ColorMenu) e.getSource();
                System.out.println(m.getColor());
            }
        };
        cm.addActionListener(lst);
        menuBar.add(cm);

        return menuBar;
    }

    public static void main(String argv[]) {
        new ColorChooserMenu();
    }
}

class ColorMenu extends JMenu {
    protected Border unselectedBorder;

    protected Border selectedBorder;

    protected Border activeBorder;

    protected Hashtable paneTable;

    protected ColorPane colorPane;

    public ColorMenu(String name) {
        super(name);
        unselectedBorder = new CompoundBorder(new MatteBorder(1, 1, 1, 1, getBackground()),
                new BevelBorder(BevelBorder.LOWERED, Color.white, Color.gray));
        selectedBorder = new CompoundBorder(new MatteBorder(1, 1, 1, 1, Color.red),
                new MatteBorder(1, 1, 1, 1, getBackground()));
        activeBorder = new CompoundBorder(new MatteBorder(1, 1, 1, 1, Color.blue),
                new MatteBorder(1, 1, 1, 1, getBackground()));

        JPanel p = new JPanel();
        p.setBorder(new EmptyBorder(5, 5, 5, 5));
        p.setLayout(new GridLayout(8, 8));
        paneTable = new Hashtable();

        int[] values = new int[] { 0, 128, 192, 255 };

        for (int r = 0; r < values.length; r++) {
            for (int g = 0; g < values.length; g++) {
                for (int b = 0; b < values.length; b++) {
                    Color c = new Color(values[r], values[g], values[b]);
                    ColorPane pn = new ColorPane(c);
                    p.add(pn);
                    paneTable.put(c, pn);
                }
            }
        }
        add(p);
    }

    public void setColor(Color c) {
        Object obj = paneTable.get(c);
        if (obj == null)
            return;
        if (colorPane != null)
            colorPane.setSelected(false);
        colorPane = (ColorPane) obj;
        colorPane.setSelected(true);
    }

    public Color getColor() {
        if (colorPane == null)
            return null;
        return colorPane.getColor();
    }

    public void doSelection() {
        fireActionPerformed(new ActionEvent(this, ActionEvent.ACTION_PERFORMED, getActionCommand()));
    }

    class ColorPane extends JPanel implements MouseListener {
        protected Color color;

        protected boolean isSelected;

        public ColorPane(Color c) {
            color = c;
            setBackground(c);
            setBorder(unselectedBorder);
            String msg = "R " + c.getRed() + ", G " + c.getGreen() + ", B " + c.getBlue();
            setToolTipText(msg);
            addMouseListener(this);
        }

        public Color getColor() {
            return color;
        }

        public Dimension getPreferredSize() {
            return new Dimension(15, 15);
        }

        public Dimension getMaximumSize() {
            return getPreferredSize();
        }

        public Dimension getMinimumSize() {
            return getPreferredSize();
        }

        public void setSelected(boolean selected) {
            isSelected = selected;
            if (isSelected)
                setBorder(selectedBorder);
            else
                setBorder(unselectedBorder);
        }

        public boolean isSelected() {
            return isSelected;
        }

        public void mousePressed(MouseEvent e) {
        }

        public void mouseClicked(MouseEvent e) {
        }

        public void mouseReleased(MouseEvent e) {
            setColor(color);
            MenuSelectionManager.defaultManager().clearSelectedPath();
            doSelection();
        }

        public void mouseEntered(MouseEvent e) {
            setBorder(activeBorder);
        }

        public void mouseExited(MouseEvent e) {
            setBorder(isSelected ? selectedBorder : unselectedBorder);
        }
    }
}