Class InputMap

All Implemented Interfaces:
Serializable
Direct Known Subclasses:
ComponentInputMap, InputMapUIResource 
public class InputMap
extends Object
implements Serializable

InputMap provides a binding between an input event (currently only KeyStrokes are used) and an Object. InputMaps are usually used with an ActionMap, to determine an Action to perform when a key is pressed. An InputMap can have a parent that is searched for bindings not defined in the InputMap.

As with ActionMap if you create a cycle, eg: 

InputMap am = new InputMap();
   InputMap bm = new InputMap():
   am.setParent(bm);
   bm.setParent(am);
some of the methods will cause a StackOverflowError to be thrown.
Since:
1.3
See Also:
Serialized Form

Constructors

Constructor Description
InputMap()

Creates an InputMap with no parent and no mappings.

Methods

Modifier and Type Method Description
KeyStroke[] allKeys()

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

Removes all the mappings from this InputMap.
Object get​(KeyStroke keyStroke)

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

Gets this InputMap's parent.
KeyStroke[] keys()

Returns the KeyStrokes that are bound in this InputMap.
void put​(KeyStroke keyStroke, Object actionMapKey)

Adds a binding for keyStroke to actionMapKey.
void remove​(KeyStroke key)

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

Sets this InputMap's parent.
int size()

Returns the number of KeyStroke bindings.

Methods declared in class java.lang.Object

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

Constructors

InputMap

public InputMap()

Creates an InputMap with no parent and no mappings.

Methods

setParent

public void setParent(InputMap map)

Sets this InputMap's parent.

Parameters:
map - the InputMap that is the parent of this one

getParent

public InputMap getParent()

Gets this InputMap's parent.

Returns:
map the InputMap that is the parent of this one, or null if this InputMap has no parent

put

public void put(KeyStroke keyStroke,
                Object actionMapKey)

Adds a binding for keyStroke to actionMapKey. If actionMapKey is null, this removes the current binding for keyStroke.

Parameters:
keyStroke - a KeyStroke
actionMapKey - an action map key

get

public Object get(KeyStroke keyStroke)

Returns the binding for keyStroke, messaging the parent InputMap if the binding is not locally defined.

Parameters:
keyStroke - the KeyStroke for which to get the binding
Returns:
the binding for keyStroke

remove

public void remove(KeyStroke key)

Removes the binding for key from this InputMap.

Parameters:
key - the KeyStroke for which to remove the binding

clear

public void clear()

Removes all the mappings from this InputMap.

keys

public KeyStroke[] keys()

Returns the KeyStrokes that are bound in this InputMap.

Returns:
an array of the KeyStrokes that are bound in this InputMap

size

public int size()

Returns the number of KeyStroke bindings.

Returns:
the number of KeyStroke bindings

allKeys

public KeyStroke[] allKeys()

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

Returns:
an array of the KeyStrokes defined in this InputMap and its parent

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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/InputMap.html