Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Class TextAction - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

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Java^TM 2 Platform
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javax.swing.text
Class TextAction

java.lang.Object
  |
  +--javax.swing.AbstractAction
        |
        +--javax.swing.text.TextAction

Direct Known Subclasses:: DefaultEditorKit.BeepAction, DefaultEditorKit.CopyAction, DefaultEditorKit.CutAction, DefaultEditorKit.DefaultKeyTypedAction, DefaultEditorKit.InsertBreakAction, DefaultEditorKit.InsertContentAction, DefaultEditorKit.InsertTabAction, DefaultEditorKit.PasteAction, StyledEditorKit.StyledTextAction

public abstract class TextAction
extends AbstractAction

An Action implementation useful for key bindings that are shared across a number of different text components. Because the action is shared, it must have a way of getting it's target to act upon. This class provides support to try and find a text component to operate on. The preferred way of getting the component to act upon is through the ActionEvent that is received. If the Object returned by getSource can be narrowed to a text component, it will be used. If the action event is null or can't be narrowed, the last focused text component is tried. This is determined by being used in conjunction with a JTextController which arranges to share that information with a TextAction.

Warning: Serialized objects of this class will not be compatible with future Swing releases. The current serialization support is appropriate for short term storage or RMI between applications running the same version of Swing. A future release of Swing will provide support for long term persistence.

See Also:: Serialized Form

Fields inherited from class javax.swing.AbstractAction

changeSupport, enabled

Constructor Summary

TextAction(String name)
          Creates a new JTextAction object.

Method Summary

static Action[] augmentList(Action[] list1, Action[] list2)
          Takes one list of commands and augments it with another list of commands.

protected JTextComponent getFocusedComponent()
          Fetches the text component that currently has focus.

protected JTextComponent getTextComponent(ActionEvent e)
          Determines the component to use for the action.

Methods inherited from class javax.swing.AbstractAction

addPropertyChangeListener, clone, firePropertyChange, getValue, isEnabled, putValue, removePropertyChangeListener, setEnabled

Methods inherited from class java.lang.Object

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

Constructor Detail

TextAction

public TextAction(String name)

Creates a new JTextAction object.

Parameters:: name - the name of the action

Method Detail

getTextComponent

protected final JTextComponent getTextComponent(ActionEvent e)

Determines the component to use for the action. This if fetched from the source of the ActionEvent if it's not null and can be narrowed. Otherwise, the last focused component is used.

Parameters:: e - the ActionEvent
Returns:: the component

augmentList

public static final Action[] augmentList(Action[] list1,
                                         Action[] list2)

Takes one list of commands and augments it with another list of commands. The second list is considered to be higher priority than the first list and commands with the same name will both lists will only have the dominate command found in the second list in the returned list.

Parameters:: list1 - the first list, may be empty but not null; list2 - the second list, may be empty but not null
Returns:: the augmented list

getFocusedComponent

protected final JTextComponent getFocusedComponent()

Fetches the text component that currently has focus. This allows actions to be shared across text components which is useful for key-bindings where a large set of actions are defined, but generally used the same way across many different components.

Returns:: the component