How to use JTree?
hi,
I need of an object that allows me to choose a directory path, and I think JTree do this.
But I never have used it;
I have read Java tutorial, but I don't know how to do to show in JTree my hard disk partition and directory.
Then, I must create a class that manages JTree or I can create it directly where it is needed?
Do Can you post me some code line showing the correct use of it?
Thanks.
Look at this, and copy what you need
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.util.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.tree.DefaultTreeCellRenderer;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.TreePath;
import java.io.*;
public class TreeSP extends JFrame implements ActionListener
JTree jtR;
JTree jtL;
JSplitPane jsP1,jsP2;
JScrollPane jsL;
JScrollPane jsR;
JButton jbc,jbd;
Tpan panel = new Tpan();
int from = -1;
int mark = -1;
Point toP = new Point(0,0);
Vector frV = new Vector();
Vector toV = new Vector();
DefaultTreeCellRenderer tcl = new MyTreeCellRenderer();
public TreeSP()
setBounds(1,1,700,400);
getContentPane().setLayout(new BorderLayout());
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent ev)
{ dispose();
System.exit(0);
LeftTree();
RightTree();
jsL = new JScrollPane(jtL);
jsL.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);
jsR = new JScrollPane(jtR);
addAdjustmentListener(jsR);
addAdjustmentListener(jsL);
JPanel stam = new JPanel();
stam.addMouseListener(new MouseAdapter()
{ public void mousePressed(MouseEvent m)
panel.findLine(m.getX(),m.getY());
jsP2 = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,stam,jsR);
jsP1 = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,jsL,jsP2);
jsP2.setBorder(null);
jsP1.setDividerSize(8);
jsP2.setDividerSize(10);
jsP2.setDividerLocation(190);
panel.add("Center",jsP1);
getContentPane().add("Center",panel);
JPanel butt = new JPanel();
butt.setPreferredSize(new Dimension(0,25));
butt.setLayout(new GridLayout(0,5,10,10));
butt.setBorder(new EmptyBorder(4,1,0,0));
getContentPane().add("South",butt);
jbc = new JButton("Connect");
butt.add(jbc);
jbc.addActionListener(this);
jbd = new JButton("DisConnect");
butt.add(jbd);
jbd.addActionListener(this);
setVisible(true);
private void addAdjustmentListener(JScrollPane jsp)
jsp.getVerticalScrollBar().addAdjustmentListener(new AdjustmentListener()
{ public void adjustmentValueChanged(AdjustmentEvent a)
panel.repaint();
jsp.getHorizontalScrollBar().addAdjustmentListener(new AdjustmentListener()
{ public void adjustmentValueChanged(AdjustmentEvent a)
panel.repaint();
public void actionPerformed(ActionEvent ae)
if (ae.getSource() == jbc) connect();
if (ae.getSource() == jbd)
if (mark > -1 && panel.calculateLine(mark))
frV.remove(mark);
toV.remove(mark);
mark = -1;
panel.repaint();
else(disConnect());
private void doNode(DefaultMutableTreeNode aba, File ifile)
String[] progs = ifile.list();
for (int pri=0; pri < progs.length; pri++)
File f = new File(ifile.getPath()+"/"+progs[pri]);
if (f.isFile())
aba.add(new DefaultMutableTreeNode(f.getName()));
if (f.isDirectory())
if (f.isHidden())
// aba.add(new DefaultMutableTreeNode("Hd> "+file));
else
DefaultMutableTreeNode dry = new DefaultMutableTreeNode(f.getName());
aba.add(dry);
doNode(dry,f);
private void LeftTree()
File file = new File(System.getProperty("user.dir"));
DefaultMutableTreeNode rot = new DefaultMutableTreeNode(file.getAbsolutePath());
doNode(rot,file);
jtL = new JTree(rot);
jtL.setCellRenderer(tcl);
jtL.putClientProperty("JTree.lineStyle", "Angled");
jtL.addMouseListener(new MouseAdapter()
{ public void mousePressed(MouseEvent m)
from = jtL.getClosestRowForLocation(m.getX(),m.getY());
toP.setLocation(-1,-1);
jtL.setSelectionRow(from);
panel.repaint();
public void mouseReleased(MouseEvent m)
int x = m.getX() - jsR.getX() + 4;
Rectangle vl = jsL.getViewport().getViewRect();
Rectangle vr = jsR.getViewport().getViewRect();
if (x > 1)
int t = jtR.getClosestRowForLocation(x,m.getY()-vl.y+vr.y);
jtR.setSelectionRow(t);
connect();
from = -1;
panel.repaint();
jtL.addMouseMotionListener(new MouseMotionAdapter()
{ public void mouseDragged(MouseEvent m)
if (from > -1)
toP.setLocation(m.getX()+4+12,m.getY()+2);
panel.repaint();
private void RightTree()
File file = new File(System.getProperty("user.dir"));
DefaultMutableTreeNode rot = new DefaultMutableTreeNode(file.getAbsolutePath());
doNode(rot,file);
jtR = new JTree(rot);
jtR.setBorder(new EmptyBorder(0,12,0,0));
jtR.setCellRenderer(tcl);
jtR.addMouseListener(new MouseAdapter()
{ public void mousePressed(MouseEvent m)
panel.repaint();
public void mouseReleased(MouseEvent m)
panel.repaint();
private void connect()
TreePath fl = jtL.getPathForRow(jtL.getMinSelectionRow());
TreePath fr = jtR.getPathForRow(jtR.getMinSelectionRow());
if (fl == null || fr == null) return;
frV.add(fl);
toV.add(fr);
panel.repaint();
private void disConnect()
TreePath fl = jtL.getPathForRow(jtL.getMinSelectionRow());
TreePath fr = jtR.getPathForRow(jtR.getMinSelectionRow());
if (fl == null || fr == null) return;
frV.remove(fl);
toV.remove(fr);
panel.repaint();
public class Tpan extends JPanel
Rectangle ll;
Rectangle rr;
public Tpan()
setLayout(new BorderLayout());
private void findLine(int x, int y)
x = x + jsP2.getX();
for (int k=0; k < frV.size(); k++)
if (calculateLine(k))
Rectangle vl = jsL.getViewport().getViewRect();
Rectangle vr = jsR.getViewport().getViewRect();
Line2D line = new Line2D.Double(ll.x,ll.y-vl.y,rr.x,rr.y-vr.y);
if (line.ptLineDist(x,y) < 2)
mark = k;
repaint();
return;
if (mark != -1)
mark = -1;
repaint();
public void paint(Graphics g)
super.paint(g);
myPaint(g);
public void myPaint(Graphics g1)
g1.setColor(Color.black);
Graphics2D g = (Graphics2D)g1;
g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);
for (int k=0; k < frV.size(); k++)
if (calculateLine(k))
Rectangle vl = jsL.getViewport().getViewRect();
Rectangle vr = jsR.getViewport().getViewRect();
// if (vl.contains(1,ll.y) || vr.contains(1,rr.y))
if (k == mark) g.setColor(Color.red);
else g.setColor(Color.black);
int o = getOfset(frV.get(k));
g.drawLine(o,ll.y-vl.y,ll.x,ll.y-vl.y);
g.drawLine(ll.x,ll.y-vl.y,rr.x,rr.y-vr.y);
int l = getEnd(toV.get(k));
g.fillRect(rr.x,rr.y-vr.y,l,1);
g.drawLine(rr.x+l,rr.y-vr.y-2,rr.x+l+7,rr.y-vr.y);
g.drawLine(rr.x+l,rr.y-vr.y+2,rr.x+l+7,rr.y-vr.y);
g.setColor(Color.gray);
if (from > -1 && toP.x > -1)
Rectangle ll = jtL.getRowBounds(from);
Rectangle vl = jsL.getViewport().getViewRect();
ll.x = getStart();
ll.y = ll.y + ll.height/2 - vl.y + 1;
g.drawLine(ll.x,ll.y,toP.x,toP.y-vl.y);
private boolean calculateLine(int k) // to calculate the line Points in Tpan
TreePath f1 = (TreePath)frV.get(k);
if (f1 == null) return(false);
ll = jtL.getPathBounds(f1);
ll.x = jsL.getX()+jsL.getWidth();
ll.y = ll.y + ll.height/2 + 2;
TreePath f2 = (TreePath)toV.get(k);
if (f2 == null) return(false);
rr = jtR.getPathBounds(f2);
rr.y = rr.y + rr.height/2 + 2;
rr.x = jsP2.getX()+jsP2.getDividerLocation()+jsP2.getDividerSize()-1;
return(true);
private int getOfset(Object o) // to calculate where to start the horizntal
{ // line on the left side
Rectangle r = jtL.getPathBounds((TreePath)o);
Point p = jsL. getViewport(). getViewPosition();
int n = Math.max(0,r.x + r.width - p.x);
if (jsL.getVerticalScrollBar().isVisible()) n = n+18;
if (jsL.getWidth() < n) n = jsL.getWidth();
return(n);
private int getStart() // to calculate where to start the draging line
TreePath f = jtL.getPathForRow(jtL.getMinSelectionRow());
return(getOfset(f));
private int getEnd(Object o) // to calculate where to end the horizontal
{ // ot the right side
Rectangle r = jtR.getPathBounds((TreePath)o);
Point p = jsR. getViewport().getViewPosition();
int n = Math.max(0,r.x - p.x - 7);
return(n);
public class MyTreeCellRenderer extends DefaultTreeCellRenderer
ImageIcon i1 = new ImageIcon("attribute.gif");
ImageIcon i2 = new ImageIcon("condition.gif");
public MyTreeCellRenderer()
super();
setFont(new Font("",1,11));
super.setLeafIcon(i1);
super.setOpenIcon(i2);
public Component getTreeCellRendererComponent(JTree tree,
Object value,
boolean selected,
boolean expanded,
boolean leaf,
int row,
boolean hasFocus)
super.getTreeCellRendererComponent(tree,value,
selected,
expanded,
leaf,
row,
hasFocus);
return(this);
public static void main (String[] args)
new TreeSP();
} Noah
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