javax.swing.plaf.basic
Class BasicListUI.IncrementLeadSelectionAction

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

All Implemented Interfaces:

Action, ActionListener, Cloneable, EventListener, Serializable

Direct Known Subclasses:

BasicListUI.EndAction, BasicListUI.HomeAction, BasicListUI.IncrementLeadByColumnAction, BasicListUI.PageDownAction, BasicListUI.PageUpAction

Enclosing class:

BasicListUI

private static class BasicListUI.IncrementLeadSelectionAction

extends AbstractAction

Action to increment the selection in the list up/down a row at a type. This also has the option to extend the selection, or only move the lead.

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.IncrementLeadSelectionAction(String name, int type)
protected	BasicListUI.IncrementLeadSelectionAction(String name, int type, int amount)

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.IncrementLeadSelectionAction

protected BasicListUI.IncrementLeadSelectionAction(String name,
                                                   int type)

BasicListUI.IncrementLeadSelectionAction

protected BasicListUI.IncrementLeadSelectionAction(String name,
                                                   int type,
                                                   int amount)

Method Detail

getNextIndex

protected int getNextIndex(JList list)

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

getAmount

protected int getAmount(JList list)

Returns the amount to increment by.

ensureIndexIsVisible

protected void ensureIndexIsVisible(JList list,
                                    int index)

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

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.