praktikum-holons/src/ui/view/component/TrippleCheckBox.java

package ui.view.component;

import java.awt.Color;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.Icon;
import javax.swing.JCheckBox;
import javax.swing.UIManager;

public class TrippleCheckBox extends JCheckBox implements Icon, ActionListener {

	public enum State {
		unselected, mid_state_selection, selected
	};

	State state;
	final static Icon icon = UIManager.getIcon("CheckBox.icon");

	public TrippleCheckBox() {
		this("", State.unselected);
	}

	public TrippleCheckBox(String text) {
		this(text, State.unselected);
	}

	public TrippleCheckBox(String text, State selection) {
		super(text, selection == State.selected);
		setSelectionState(selection);
		addActionListener(this);
		setIcon(this);
	}

	@Override
	public boolean isSelected() {
		return (getSelectionState() == State.selected);
	}

	public State getSelectionState() {
		return state;
	}

	public void setSelectionState(State selection) {
		state = selection;
		setSelected(state == State.selected);
		repaint();
	}


	@Override
	public void paintIcon(Component c, Graphics g, int x, int y) {
		icon.paintIcon(c, g, x, y);
		if (getSelectionState() != State.mid_state_selection)
			return;

		int w = getIconWidth();
		int h = getIconHeight();
		g.setColor(Color.white);
		g.fillRect(x + 1, y + 1, w - 2, h - 2);
		g.setColor(c.isEnabled() ? new Color(51, 51, 51) : new Color(122, 138, 153));
		g.fillRect(x + 4, y + 4, w - 8, h - 8);

		if (!c.isEnabled())
			return;
		g.setColor(new Color(81, 81, 81));
		g.drawRect(x + 4, y + 4, w - 9, h - 9);
	}

	@Override
	public int getIconWidth() {
		return icon.getIconWidth();
	}

	@Override
	public int getIconHeight() {
		return icon.getIconHeight();
	}

	public void actionPerformed(ActionEvent e) {
		switch (getSelectionState()) {
		case unselected:
			setSelectionState(State.selected);
			break;
		case mid_state_selection:
			setSelectionState(State.unselected);
			break;
		case selected:
			setSelectionState(State.unselected);
			break;
		}
	}
}