Module java.desktop
Package javax.swing

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

    • Constructor Detail

      • ActionMap

        public ActionMap​()
        Creates an ActionMap with no parent and no mappings.

    • Method Detail

      • 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