org.jhotdraw.app.action.edit

Class UndoAction

java.lang.Object

javax.swing.AbstractAction

org.jhotdraw.app.action.AbstractViewAction

org.jhotdraw.app.action.edit.UndoAction

All Implemented Interfaces:

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

public class UndoAction
extends AbstractViewAction

Undoes the last user action.

This action requires that the View returns a project specific undo action when invoking getActionMap("redo") on a View.

This action is called when the user selects the Undo item in the Edit menu. The menu item is automatically created by the application.

If you want this behavior in your application, you have to create an action with this ID and put it in your ApplicationModel in method ApplicationModel.initApplication(org.jhotdraw.app.Application).

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	ID

Fields inherited from class org.jhotdraw.app.action.AbstractViewAction

ENABLED_PROPERTY, VIEW_PROPERTY

Fields inherited from class javax.swing.AbstractAction

changeSupport, enabled

Fields inherited from interface javax.swing.Action

ACCELERATOR_KEY, ACTION_COMMAND_KEY, DEFAULT, DISPLAYED_MNEMONIC_INDEX_KEY, LARGE_ICON_KEY, LONG_DESCRIPTION, MNEMONIC_KEY, NAME, SELECTED_KEY, SHORT_DESCRIPTION, SMALL_ICON

Constructor Summary

Constructors

Constructor and Description
UndoAction(Application app, View view) Creates a new instance.

Method Summary

Modifier and Type	Method and Description
void	actionPerformed(java.awt.event.ActionEvent e)
protected void	installViewListeners(View p) Installs listeners on the view object.
protected void	uninstallViewListeners(View p) Installs listeners on the view object.
protected void	updateEnabledState()
protected void	updateView(View oldValue, View newValue) Updates the listeners of this action depending on the current view of the application.

Methods inherited from class org.jhotdraw.app.action.AbstractViewAction

getActiveView, getApplication, getPropertyName, isEnabled, setEnabled, setPropertyName, updateEnabled, updateView

Methods inherited from class javax.swing.AbstractAction

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

Methods inherited from class java.lang.Object

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

Field Detail

ID

public static final java.lang.String ID

See Also:

Constant Field Values

Constructor Detail

UndoAction

public UndoAction(Application app,
                  View view)

Creates a new instance.

Method Detail

updateEnabledState

protected void updateEnabledState()

updateView

protected void updateView(View oldValue,
                          View newValue)

Description copied from class: AbstractViewAction

Updates the listeners of this action depending on the current view of the application.

Overrides:

updateView in class AbstractViewAction

installViewListeners

protected void installViewListeners(View p)

Installs listeners on the view object.

Overrides:

installViewListeners in class AbstractViewAction

uninstallViewListeners

protected void uninstallViewListeners(View p)

Installs listeners on the view object.

Overrides:

uninstallViewListeners in class AbstractViewAction

actionPerformed

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