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.
InputMap| Constructor and Description |
|---|
ActionMap()
Creates an
ActionMap with no parent and no mappings. |
| Modifier and Type | Method and 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. |
public ActionMap()
ActionMap with no parent and no mappings.public void setParent(ActionMap map)
ActionMap's parent.map - the ActionMap that is the parent of this onepublic ActionMap getParent()
ActionMap's parent.ActionMap that is the parent of this one,
or null if this ActionMap has no parentpublic void put(Object key, Action action)
key to action.
If action is null, this removes the current binding
for key.
In most instances, key will be
action.getValue(NAME).
public Action get(Object key)
key, messaging the
parent ActionMap if the binding is not locally defined.public void remove(Object key)
key from this ActionMap.public void clear()
ActionMap.public Object[] keys()
Action names that are bound in this ActionMap.public int size()
ActionMap.ActionMappublic Object[] allKeys()
ActionMap and
its parent. This method differs from keys() in that
this method includes the keys defined in the parent. Submit a bug or feature
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
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