XORToggleButtonGroup

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Sourc code of org.greenstone.gatherer.util.XORToggleButtonGroup

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org.greenstone.gatherer.util
Class XORToggleButtonGroup

java.lang.Object
  org.greenstone.gatherer.util.XORToggleButtonGroup

All Implemented Interfaces:: java.awt.event.ActionListener, java.util.EventListener

public class XORToggleButtonGroup
extends java.lang.Object
implements java.awt.event.ActionListener

Just like any other button group, this object encapsulates several checkbox listeners, but instead of recording which are selected, or indeed what buttons it has assigned to it, this group has but one purpose: to ensure that at least one check button is always selected.

Field Summary

private boolean ignore
          true if we are to ignore any further change events we recieve.

private javax.swing.JToggleButton last_button


private int selected_count
          The current number of checkboxes that are selected.

Constructor Summary

XORToggleButtonGroup()


Method Summary

void actionPerformed(java.awt.event.ActionEvent event)
          Any implementation of ActionListener includes this method so that we can be informed when an action has occured on any registered checkboxes, allowing us to roll back the action if this is the only selected checkbox remaining.

void add(javax.swing.JToggleButton toggle_button)


void establish()
          Ensures that at least one option is selected.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

ignore

private boolean ignore

true if we are to ignore any further change events we recieve.

selected_count

private int selected_count

The current number of checkboxes that are selected. Never < 1.

last_button

private javax.swing.JToggleButton last_button

Constructor Detail