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public class ActionMap extends Object implements Serializable
ActionMap
provides mappings from
Object
s
(called keys or Action
names)
to Action
s.
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.
Constructor Summary | |
---|---|
Creates an ActionMap with no parent and no mappings.
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Method Summary | |
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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 |
Returns the binding for key , messaging the
parent ActionMap if the binding is not locally defined.
|
ActionMap |
Returns this ActionMap 's parent.
|
Object[] |
keys() Returns the Action names that are bound in this ActionMap .
|
void |
Adds a binding for key to action .
|
void |
Removes the binding for key from this ActionMap .
|
void |
Sets this ActionMap 's parent.
|
int |
size() Returns the number of KeyStroke bindings.
|
Methods inherited from class java.lang.Object |
---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public ActionMap()
ActionMap
with no parent and no mappings.
Method Detail |
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public Object[] allKeys()
ActionMap
and
its parent. This method differs from keys()
in that
this method includes the keys defined in the parent.
public void clear()
ActionMap
.
public Action get(Object key)
key
, messaging the
parent ActionMap
if the binding is not locally defined.
key
public ActionMap getParent()
ActionMap
's parent.
ActionMap
that is the parent of this one,
or null if this ActionMap
has no parentpublic Object[] keys()
Action
names that are bound in this ActionMap
.
public 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)
.
key
action
public void remove(Object key)
key
from this ActionMap
.
key
public void setParent(ActionMap map)
ActionMap
's parent.
map
- the ActionMap
that is the parent of this onepublic int size()
KeyStroke
bindings.
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