Class ActionMap

public class ActionMap
extends Object
implements Serializable

ActionMap provides mappings from Objects (called keys or Action names) to Actions. An ActionMap is usually used with an InputMap to locate a particular action when a key is pressed. As with InputMap, an ActionMap can have a parent that is searched for keys not defined in the ActionMap.

As with InputMap if you create a cycle, eg:

ActionMap am = new ActionMap();
   ActionMap bm = new ActionMap():
   am.setParent(bm);
   bm.setParent(am);

some of the methods will cause a StackOverflowError to be thrown.

Constructors

ActionMap

public ActionMap()

Creates an ActionMap with no parent and no mappings.

Methods

setParent

public void setParent(ActionMap map)

Sets this ActionMap's parent.

Parameters:

map - the ActionMap that is the parent of this one

getParent

public ActionMap getParent()

Returns this ActionMap's parent.

Returns:

the ActionMap that is the parent of this one, or null if this ActionMap has no parent

put

public void put(Object key,
                Action action)

get

public Action get(Object key)

Returns the binding for key, messaging the parent ActionMap if the binding is not locally defined.

remove

public void remove(Object key)

Removes the binding for key from this ActionMap.

clear

public void clear()

Removes all the mappings from this ActionMap.

keys

public Object[] keys()

Returns the Action names that are bound in this ActionMap.

size

public int size()

Returns the number of bindings in this ActionMap.

Returns:

the number of bindings in this ActionMap

allKeys

public Object[] allKeys()

Returns an array of the keys defined in this ActionMap and its parent. This method differs from keys() in that this method includes the keys defined in the parent.