javax.swing.plaf.basic
Class BasicListUI.PageDownAction

java.lang.Object
  javax.swing.AbstractAction
      javax.swing.plaf.basic.BasicListUI.IncrementLeadSelectionAction
          javax.swing.plaf.basic.BasicListUI.PageDownAction

All Implemented Interfaces:

Action, ActionListener, Cloneable, EventListener, Serializable

Enclosing class:

BasicListUI

private static class BasicListUI.PageDownAction

extends BasicListUI.IncrementLeadSelectionAction

Action to move down one page.

Nested Class Summary

Nested classes inherited from class javax.swing.AbstractAction

Field Summary

protected int	amount Amount to offset, subclasses will define what this means.
protected int	selectionType One of CHANGE_LEAD, CHANGE_SELECTION or EXTEND_SELECTION.

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

protected

BasicListUI.PageDownAction(String name, int type)

Method Summary

void	actionPerformed(ActionEvent e) Invokes getNextIndex to determine the next index to select.
protected void	ensureIndexIsVisible(JList list, int index) Ensures the particular index is visible.
protected int	getAmount(JList list) Returns the amount to increment by.
protected int	getNextIndex(JList list) Returns the next index to select.

Methods inherited from class javax.swing.AbstractAction

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

Methods inherited from class java.lang.Object

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

Field Detail

amount

protected int amount

Amount to offset, subclasses will define what this means.

selectionType

protected int selectionType

One of CHANGE_LEAD, CHANGE_SELECTION or EXTEND_SELECTION.

Constructor Detail

BasicListUI.PageDownAction

protected BasicListUI.PageDownAction(String name,
                                     int type)

Method Detail

getNextIndex

protected int getNextIndex(JList list)

Description copied from class: BasicListUI.IncrementLeadSelectionAction

Returns the next index to select. This is based on the lead selected index and the amount ivar.

Overrides:

getNextIndex in class BasicListUI.IncrementLeadSelectionAction

ensureIndexIsVisible

protected void ensureIndexIsVisible(JList list,
                                    int index)

Description copied from class: BasicListUI.IncrementLeadSelectionAction

Ensures the particular index is visible. This simply forwards the method to list.

Overrides:

ensureIndexIsVisible in class BasicListUI.IncrementLeadSelectionAction

getAmount

protected int getAmount(JList list)

Returns the amount to increment by.

actionPerformed

public void actionPerformed(ActionEvent e)

Invokes getNextIndex to determine the next index to select. If the index is valid (not -1 and < size of the model), this will either: move the selection to the new index if the selectionType == CHANGE_SELECTION, move the lead to the new index if selectionType == CHANGE_LEAD, otherwise the selection is extend from the anchor to the new index and the lead is set to the new index.