META-INF.modules.java.desktop.classes.javax.swing.text.TextAction Maven / Gradle / Ivy
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* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
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*
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
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package javax.swing.text;
import java.awt.event.ActionEvent;
import java.awt.KeyboardFocusManager;
import java.awt.Component;
import java.util.Hashtable;
import java.util.Enumeration;
import javax.swing.Action;
import javax.swing.AbstractAction;
import javax.swing.KeyStroke;
/**
* 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. As of 1.4, support for long term storage
* of all JavaBeans™
* has been added to the java.beans package.
* Please see {@link java.beans.XMLEncoder}.
*
* @author Timothy Prinzing
*/
@SuppressWarnings("serial") // Same-version serialization only
public abstract class TextAction extends AbstractAction {
/**
* Creates a new JTextAction object.
*
* @param name the name of the action
*/
public TextAction(String name) {
super(name);
}
/**
* 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.
*
* @param e the ActionEvent
* @return the component
*/
protected final JTextComponent getTextComponent(ActionEvent e) {
if (e != null) {
Object o = e.getSource();
if (o instanceof JTextComponent) {
return (JTextComponent) o;
}
}
return getFocusedComponent();
}
/**
* Takes one list of
* commands and augments it with another list
* of commands. The second list takes precedence
* over the first list; that is, when both lists
* contain a command with the same name, the command
* from the second list is used.
*
* @param list1 the first list, may be empty but not
* null
* @param list2 the second list, may be empty but not
* null
* @return the augmented list
*/
public static final Action[] augmentList(Action[] list1, Action[] list2) {
Hashtable h = new Hashtable();
for (Action a : list1) {
String value = (String)a.getValue(Action.NAME);
h.put((value!=null ? value:""), a);
}
for (Action a : list2) {
String value = (String)a.getValue(Action.NAME);
h.put((value!=null ? value:""), a);
}
Action[] actions = new Action[h.size()];
int index = 0;
for (Enumeration e = h.elements() ; e.hasMoreElements() ;) {
actions[index++] = e.nextElement();
}
return actions;
}
/**
* 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.
*
* @return the component
*/
protected final JTextComponent getFocusedComponent() {
return JTextComponent.getFocusedComponent();
}
}