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package tim.prune.gui;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import javax.swing.ImageIcon;
import javax.swing.JCheckBox;
/**
* Class to represent a checkbox with multiple states, through which it cycles.
* Instead of calling isChecked, callers need to use getCurrentState which will
* return 0 up to (n-1) for n states.
*/
public class MultiStateCheckBox extends JCheckBox implements ItemListener
{
/** Array of icons to be used */
private final ImageIcon[] _icons;
/** Current state 0 to n-1 */
private int _currState = 0;
/** Number of states n */
private final int _numStates;
/** Inner class to proxy the listening events */
private static class ProxyListener implements ItemListener
{
/** Listener onto which some of the events will be passed */
private ItemListener _listener = null;
/** Constructor */
ProxyListener(ItemListener inListener) {_listener = inListener;}
/** React to events, and only pass on the selected ones */
public void itemStateChanged(ItemEvent e) {
if (e.getStateChange() == ItemEvent.SELECTED) {
_listener.itemStateChanged(e);
}
}
}
/**
* Constructor
* @param inNumStates number of states to cycle through
*/
public MultiStateCheckBox(int inNumStates)
{
_numStates = (inNumStates > 0) ? inNumStates : 1;
_icons = new ImageIcon[_numStates];
addItemListener(this);
}
/**
* @param inState state to set
*/
public void setCurrentState(int inState)
{
_currState = inState % _numStates;
setIcon(_icons[_currState]);
setSelected(false);
setSelectedIcon(_icons[(_currState+1) % _numStates]);
}
/**
* @return current state 0 to n-1
*/
public int getCurrentState()
{
return _currState;
}
/**
* Set the icon to use for the given index
* @param inIndex index 0 to n-1
* @param inIcon icon to use for that state
*/
public void setIcon(int inIndex, ImageIcon inIcon)
{
_icons[inIndex % _numStates] = inIcon;
}
/** Intercept listener adding by putting a proxy inbetween */
@Override
public void addItemListener(ItemListener inListener) {
super.addItemListener(new ProxyListener(inListener));
}
/** React to a selection event by advancing the state */
public void itemStateChanged(ItemEvent inEvent)
{
setCurrentState(_currState + 1);
}
}
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