KeymapExample.java Source code

Introduction

Here is the source code for KeymapExample.java

Source

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.BadLocationException;
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;

public class KeymapExample {
    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 UpWord();
        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);

        KeyStroke W = KeyStroke.getKeyStroke(KeyEvent.VK_W, InputEvent.CTRL_MASK);
        Action actionW = (Action) lookup.get(DefaultEditorKit.selectWordAction);
        newmap.addActionForKeyStroke(W, actionW);

        area.setKeymap(newmap);

        JFrame f = new JFrame("KeymapExample");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().add(new JScrollPane(area), BorderLayout.CENTER);
        area.setText("This is a test.");
        f.pack();
        f.setVisible(true);
    }

}

class UpWord extends TextAction {
    public UpWord() {
        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 = javax.swing.text.Utilities.getWordStart(comp, start);
            int right = javax.swing.text.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 (BadLocationException ble) {
            return;
        }
    }
}