📄 keytester.java
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// Responding to Keystrokes
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.event.ActionEvent;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.ActionMap;
import javax.swing.InputMap;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.KeyStroke;
public class KeyTester {
static class MyActionListener extends AbstractAction {
MyActionListener(String s) {
super(s);
}
public void actionPerformed(ActionEvent e) {
System.out.println(getValue(Action.NAME));
}
}
public static void main(String args[]) {
String actionKey = "theAction";
JFrame f = new JFrame("Key Tester");
JButton jb1 = new JButton("<html><center>B<br>Focused/Typed");
JButton jb2 = new JButton("<html><center>Ctrl-C<br>Window/Pressed");
JButton jb3 = new JButton("<html><center>Shift-D<br>Ancestor/Released");
Container pane = f.getContentPane();
pane.add(jb1, BorderLayout.NORTH);
pane.add(jb2, BorderLayout.CENTER);
pane.add(jb3, BorderLayout.SOUTH);
KeyStroke stroke = KeyStroke.getKeyStroke("typed B");
Action action = new MyActionListener("Action Happened");
// Defaults to JComponent.WHEN_FOCUSED map
InputMap inputMap = jb1.getInputMap();
inputMap.put(stroke, actionKey);
ActionMap actionMap = jb1.getActionMap();
actionMap.put(actionKey, action);
stroke = KeyStroke.getKeyStroke("ctrl C");
action = new MyActionListener("Action Didn't Happen");
inputMap = jb2.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW);
inputMap.put(stroke, actionKey);
actionMap = jb2.getActionMap();
actionMap.put(actionKey, action);
stroke = KeyStroke.getKeyStroke("shift released D");
action = new MyActionListener("What Happened?");
inputMap = jb3
.getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);
inputMap.put(stroke, actionKey);
actionMap = jb3.getActionMap();
actionMap.put(actionKey, action);
f.setSize(200, 200);
f.show();
}
}
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