Source Code : Showing how to add Actions for KeyStrokes

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Showing how to add Actions for KeyStrokes

  
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;
    }
  }
}

           
         
    
  

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