TextArea Views 3 : TextArea « Swing JFC « Java






TextArea Views 3

TextArea Views 3
 
/*
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);
      }
    }
  }
}
           
         
  








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