TextAreaViews.java Source code

Introduction

Here is the source code for TextAreaViews.java

Source

/*
Core SWING Advanced Programming 
By Kim Topley
ISBN: 0 13 083292 8       
Publisher: Prentice Hall  
*/

import java.io.PrintStream;

import javax.swing.JFrame;
import javax.swing.JTextArea;
import javax.swing.UIManager;
import javax.swing.text.BadLocationException;
import javax.swing.text.Document;
import javax.swing.text.JTextComponent;
import javax.swing.text.View;

public class TextAreaViews {
    public static void main(String[] args) {
        try {
            UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
        } catch (Exception evt) {
        }

        JFrame f = new JFrame("Text Area Views");
        JTextArea ta = new JTextArea(5, 32);
        ta.setText("That's one small step for man...\nOne giant leap for mankind.");

        f.getContentPane().add(ta);
        f.setSize(200, 100);
        f.setVisible(true);

        ViewDisplayer.displayViews(ta, System.out);

        try {
            Thread.sleep(30000);
            ViewDisplayer.displayViews(ta, System.out);
        } catch (InterruptedException e) {
        }
    }

}

class ViewDisplayer {
    public static void displayViews(JTextComponent comp, PrintStream out) {
        View rootView = comp.getUI().getRootView(comp);
        displayView(rootView, 0, comp.getDocument(), out);
    }

    public static void displayView(View view, int indent, Document doc, PrintStream out) {
        String name = view.getClass().getName();
        for (int i = 0; i < indent; i++) {
            out.print("\t");
        }

        int start = view.getStartOffset();
        int end = view.getEndOffset();
        out.println(name + "; offsets [" + start + ", " + end + "]");
        int viewCount = view.getViewCount();
        if (viewCount == 0) {
            int length = Math.min(32, end - start);
            try {
                String txt = doc.getText(start, length);
                for (int i = 0; i < indent + 1; i++) {
                    out.print("\t");
                }
                out.println("[" + txt + "]");
            } catch (BadLocationException e) {
            }
        } else {
            for (int i = 0; i < viewCount; i++) {
                displayView(view.getView(i), indent + 1, doc, out);
            }
        }
    }
}