Class ActionMap

All Implemented Interfaces:
Serializable
Direct Known Subclasses:
ActionMapUIResource
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.
Since:
1.3
See Also:
InputMap, Serialized Form

Constructors

Constructor Description
ActionMap()

Creates an ActionMap with no parent and no mappings.

Methods

Modifier and Type Method Description
Object[] allKeys()

Returns an array of the keys defined in this ActionMap and its parent.
void clear()

Removes all the mappings from this ActionMap.
Action get​(Object key)

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

Returns this ActionMap's parent.
Object[] keys()

Returns the Action names that are bound in this ActionMap.
void put​(Object key, Action action)

Adds a binding for key to action.
void remove​(Object key)

Removes the binding for key from this ActionMap.
void setParent​(ActionMap map)

Sets this ActionMap's parent.
int size()

Returns the number of bindings in this ActionMap.

Methods declared in class java.lang.Object

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

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)

Adds a binding for key to action. If action is null, this removes the current binding for key.

In most instances, key will be action.getValue(NAME).

Parameters:
key - a key
action - a binding for key

get

public Action get(Object key)

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

Parameters:
key - a key
Returns:
the binding for key

remove

public void remove(Object key)

Removes the binding for key from this ActionMap.

Parameters:
key - a key

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.

Returns:
an array of the keys

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.

Returns:
an array of the keys

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Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
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https://docs.oracle.com/en/java/javase/11/docs/api/java.desktop/javax/swing/ActionMap.html