Map actions with keystrokes : Action « Swing Event « Java Tutorial

1. Java Tutorial
2. Swing Event
3. Action

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.InputEvent;
import java.awt.event.KeyEvent;
import java.util.Hashtable;

import javax.swing.Action;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.KeyStroke;
import javax.swing.text.DefaultEditorKit;
import javax.swing.text.Document;
import javax.swing.text.JTextComponent;
import javax.swing.text.Keymap;
import javax.swing.text.TextAction;
import javax.swing.text.Utilities;

public class Main {
  public static void main(String[] args) {
    JTextArea area = new JTextArea(6, 32);
    Keymap parent = area.getKeymap();
    Keymap newmap = JTextComponent.addKeymap("KeymapExampleMap", parent);

    KeyStroke u = KeyStroke.getKeyStroke(KeyEvent.VK_U, InputEvent.CTRL_MASK);
    Action actionU = new UppercaseAction();
    newmap.addActionForKeyStroke(u, actionU);

    Action actionList[] = area.getActions();
    Hashtable lookup = new Hashtable();
    for (int j = 0; j < actionList.length; j += 1)
      lookup.put(actionList[j].getValue(Action.NAME), actionList[j]);

    KeyStroke L = KeyStroke.getKeyStroke(KeyEvent.VK_L, InputEvent.CTRL_MASK);
    Action actionL = (Action) lookup.get(DefaultEditorKit.selectLineAction);
    newmap.addActionForKeyStroke(L, actionL);

    area.setKeymap(newmap);

    JFrame f = new JFrame();
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.add(new JScrollPane(area), BorderLayout.CENTER);
    area.setText("this is a test");
    f.setSize(300,300);
    f.setVisible(true);
  }

}

class UppercaseAction extends TextAction {
  public UppercaseAction() {
    super("uppercase-word-action");
  }

  public void actionPerformed(ActionEvent e) {
    JTextComponent comp = getTextComponent(e);
    if (comp == null)
      return;
    Document doc = comp.getDocument();
    int start = comp.getSelectionStart();
    int end = comp.getSelectionEnd();
    try {
      int left = Utilities.getWordStart(comp, start);
      int right = Utilities.getWordEnd(comp, end);
      String word = doc.getText(left, right - left);
      doc.remove(left, right - left);
      doc.insertString(left, word.toUpperCase(), null);
      comp.setSelectionStart(start); 
      comp.setSelectionEnd(end);
    } catch (Exception ble) {
      return;
    }
  }
}

15.3.Action
	15.3.1.	AbstractAction Lookup Property Keys
	15.3.2.	Creating an Action
	15.3.3.	Action Usage Example
	15.3.4.	extends AbstractAction
	15.3.5.	Disable an Action
	15.3.6.	Get and set Action Command
	15.3.7.	Register action
	15.3.8.	ActionMap javax.swing.JComponent.getActionMap()
	15.3.9.	Map actions with keystrokes
	15.3.10.	Enabling an Action
	15.3.11.	Listing the Actions in a Component