org.pvv.bcd.instrument.JTree
Class InfoBankTreeAction

java.lang.Object
  |
  +--javax.swing.AbstractAction
        |
        +--org.pvv.bcd.instrument.JTree.InfoBankTreeAction

All Implemented Interfaces:

javax.swing.Action, java.awt.event.ActionListener, java.lang.Cloneable, java.util.EventListener, java.beans.PropertyChangeListener, java.io.Serializable

public class InfoBankTreeAction

extends javax.swing.AbstractAction

implements java.beans.PropertyChangeListener

A specialized action-wrapper class that handles both the state imposed by the tree and the state imposed from the outside. That is, even if you call setEnabled(true) on an action, it may not return true from isEnabled(). For instance, if the action is a "Copy", the instrumenter will not allow it to be enabled unless there is an active selection in the tree.

Two states are taken into account to achieve this. One is the user_state. The other is the tree_state. The user state is set by calling setEnabled() on the InfoBankTreeAction. The tree state depends on the state of the instrumented tree and is supplied by the Action object passed to the constructor. isEnabled() in this class effectively returns (user_state && tree_state).

See Also:

Serialized Form

Fields inherited from class javax.swing.AbstractAction

changeSupport, enabled

Fields inherited from interface javax.swing.Action

ACCELERATOR_KEY, ACTION_COMMAND_KEY, DEFAULT, LONG_DESCRIPTION, MNEMONIC_KEY, NAME, SHORT_DESCRIPTION, SMALL_ICON

Constructor Summary

InfoBankTreeAction(java.lang.String title, javax.swing.Action act)
Creates the action.

Method Summary

void	actionPerformed(java.awt.event.ActionEvent ev) Forwards actionPerformed() to my wrapped action.
boolean	isEnabled() Returns true only if both I and the wrapped action are both enabled.
void	propertyChange(java.beans.PropertyChangeEvent ev) Catches the "enabled" property change in the wrapped action object.

Methods inherited from class javax.swing.AbstractAction

addPropertyChangeListener, clone, firePropertyChange, getKeys, getValue, putValue, removePropertyChangeListener, setEnabled

Methods inherited from class java.lang.Object

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

Constructor Detail

InfoBankTreeAction

public InfoBankTreeAction(java.lang.String title,
                          javax.swing.Action act)

Creates the action. Adds myself as property change listener to the given action object so I can react to enablement changes.

Parameters:

title - Title, passed to super.

act - Action object to instrument with dual-state functionality.

Method Detail

propertyChange

public void propertyChange(java.beans.PropertyChangeEvent ev)

Catches the "enabled" property change in the wrapped action object. Fires an "enabled" property change based upon the new joint state of this action.

Specified by:

propertyChange in interface java.beans.PropertyChangeListener

Parameters:

ev - Event to react to.

actionPerformed

public void actionPerformed(java.awt.event.ActionEvent ev)

Forwards actionPerformed() to my wrapped action.

Overrides:

actionPerformed in class javax.swing.AbstractAction

Parameters:

ev - Event to forward

isEnabled

public boolean isEnabled()

Returns true only if both I and the wrapped action are both enabled.

Overrides:

isEnabled in class javax.swing.AbstractAction

Returns:

Enabled status of this action