Printing

Extend your tree using the following class, where you have a print() method:


import java.io.IOException;
import java.awt.*;
import java.awt.geom.*;
import java.awt.Graphics2D;
import java.awt.print.*;
import javax.swing.*;
import javax.swing.tree.*;

public class PrintableTree extends JTree implements Printable{

  public PrintableTree(DefaultTreeModel m){
    super(m);
  }

  public int print(Graphics g, PageFormat pf, int pageIndex)
                                        throws PrinterException {
    Graphics2D g2 = (Graphics2D)g;
    g2.setColor(Color.black);
    RepaintManager.currentManager(this).setDoubleBufferingEnabled(false);
    Dimension d = this.getSize();
    double panelWidth  = d.width;
    double panelHeight = d.height;
    double pageHeight = pf.getImageableHeight();
    double pageWidth  = pf.getImageableWidth();
    double scale = pageWidth/panelWidth;
    scale = scale > 0.7 ? 0.7:scale;
    int totalNumPages = (int)Math.ceil(scale * panelHeight / pageHeight);
    //System.out.println(panelHeight);
    //System.out.println(pageHeight);
    //System.out.println(totalNumPages);
    if(pageIndex >= totalNumPages) {
      //sec.util.Disp.printError("No such page(s)!");
      return Printable.NO_SUCH_PAGE;
    }
    // Shift Graphic to line up with beginning of print-imageable region
    g2.translate(pf.getImageableX(), pf.getImageableY());
    // Shift Graphic to line up with beginning of next page to print
    g2.translate(0f, -pageIndex * pageHeight);
    // Scale the page so the width fits...
    g2.scale(scale, scale);
    this.paint(g2);   //repaint the page for printing
    return Printable.PAGE_EXISTS;
  }

  public void printContent(){
    PrinterJob pj=PrinterJob.getPrinterJob();
    pj.setPrintable(this);
    if (pj.printDialog())
      try{
        pj.print();
      } catch (Exception PrintException) {}
  }
}






Before print() your tree expand the whole tree using:

     public void expandTree()
      {
        int rowCount = 0;
        Enumeration enum =  m_RootNode.preorderEnumeration();
        while(enum.hasMoreElements()) {
          rowCount++;
          DefaultMutableTreeNode node = (DefaultMutableTreeNode)enum.nextElement();
        }
        for(int row = 0; row < rowCount; row++) {
          TreePath path = m_tree.getPathForRow(row);
          if(path != null) {
            m_tree.expandPath(path);
          }
        }
      }



Of course, you can make it different, but now you have the methods for printing and expanding.