TextActionpublic 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. As of 1.4, support for long term storage
of all JavaBeansTM
has been added to the java.beans package.
Please see {@link java.beans.XMLEncoder}. |
| Constructors Summary |
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public TextAction(String name)Creates a new JTextAction object.
super(name);
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| Methods Summary |
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| public static final javax.swing.Action[] | augmentList(javax.swing.Action[] list1, javax.swing.Action[] list2)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.
Hashtable h = new Hashtable();
for (int i = 0; i < list1.length; i++) {
Action a = list1[i];
String value = (String)a.getValue(Action.NAME);
h.put((value!=null ? value:""), a);
}
for (int i = 0; i < list2.length; i++) {
Action a = list2[i];
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++] = (Action) e.nextElement();
}
return actions;
| | protected final javax.swing.text.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.
return JTextComponent.getFocusedComponent();
| | protected final javax.swing.text.JTextComponent | getTextComponent(java.awt.event.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.
if (e != null) {
Object o = e.getSource();
if (o instanceof JTextComponent) {
return (JTextComponent) o;
}
}
return getFocusedComponent();
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