Autoscroll
Hi,
Can anybody help me in doing autoscroll in swing application.
I am using the follwing code but it does not work perfectly. Sometimes it does not scroll up or down properly.
<code>
if(!scrollPane.getBounds().contains(focusedPanel.getBounds())) {
if((scrollPane.getVerticalScrollBar().getValue() + scrollPane.getViewportBorderBounds().height) < focusedPanel.getBounds().y) {
scrollPane.getViewport().setViewPosition(new Point(0, focusedPanel.getBounds().y));
scrollPane.revalidate();
scrollPane.repaint();
}else if(focusedPanel.getBounds().y < (scrollPane.getViewportBorderBounds().height - scrollPane.getVerticalScrollBar().getValue())) {
scrollPane.getViewport().setViewPosition(new Point(0, focusedPanel.getBounds().y));
scrollPane.revalidate();
scrollPane.repaint();
</code>
Here scrollPane is the component having scrollbars and focusedPanel is the component which has to be made visible after scrolling.
Thanks in advance.
try:
EventQueue.invokeLater(new Runnable()
public void run()
// scrollToRect...
});Jim
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import javax.swing.*;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.TreePath;
import javax.swing.tree.TreeNode;
import java.awt.*;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.io.IOException;
import java.util.Enumeration;
public class AutoScroll14 extends JFrame {
public static void main(String[] args) {
new AutoScroll14();
public AutoScroll14() throws HeadlessException {
super("AutoScroll 1.4");
setDefaultCloseOperation(EXIT_ON_CLOSE);
JTree tree = new JTree();
tree.setDragEnabled(true);
tree.setTransferHandler(new MyTransferHandler());
expand(tree, tree.getPathForRow(0));
JScrollPane sp = new JScrollPane(tree);
sp.setPreferredSize(new Dimension(300, 200));
Container content = getContentPane();
content.setLayout(new BorderLayout());
content.add(sp, BorderLayout.CENTER);
pack();
setVisible(true);
private void expand(JTree tree, TreePath path) {
TreeNode node = (TreeNode) path.getLastPathComponent();
for (Enumeration e = node.children(); e.hasMoreElements();) {
TreeNode n = (TreeNode) e.nextElement();
TreePath newPath = path.pathByAddingChild(n);
expand(tree, newPath);
tree.expandPath(path);
private class MyTransferHandler extends TransferHandler {
private DataFlavor localStringFlavor;
private String localStringType = DataFlavor.javaJVMLocalObjectMimeType + ";class=java.lang.String";
private MyTransferHandler() {
try {
localStringFlavor = new DataFlavor(localStringType);
} catch (ClassNotFoundException e) {
e.printStackTrace();
public boolean importData(JComponent comp, Transferable t) {
if (!canImport(comp, t.getTransferDataFlavors())) {
return false;
String data = null;
try {
if (hasLocalStringFlavor(t.getTransferDataFlavors())) {
data = (String) t.getTransferData(localStringFlavor);
} else {
return false;
} catch (UnsupportedFlavorException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
String location = null;
if (comp instanceof JTree) {
location = ((JTree) comp).getSelectionPath().toString();
System.out.println("Dropping [" + data + "] on location [" + location + "]");
return true;
private boolean hasLocalStringFlavor(DataFlavor[] flavors) {
if (localStringFlavor == null) {
return false;
for (int i = 0; i < flavors.length; i++) {
if (flavors.equals(localStringFlavor)) {
return true;
return false;
public boolean canImport(JComponent comp, DataFlavor[] flavors) {
return hasLocalStringFlavor(flavors);
protected Transferable createTransferable(JComponent c) {
if (c instanceof JTree) {
String toTransfer = ((JTree) c).getSelectionPath().toString();
System.out.println("Creating transferable [" + toTransfer + "]");
return new StringTransferable(toTransfer);
System.out.println("Could not create transferable");
return null;
public int getSourceActions(JComponent c) {
return COPY_OR_MOVE;
private class StringTransferable implements Transferable {
private String data;
private StringTransferable(String data) {
this.data = data;
public DataFlavor[] getTransferDataFlavors() {
return new DataFlavor[] { localStringFlavor };
public boolean isDataFlavorSupported(DataFlavor flavor) {
return localStringFlavor.equals(flavor);
public Object getTransferData(DataFlavor flavor) throws UnsupportedFlavorException, IOException {
if (!isDataFlavorSupported(flavor)) {
throw new UnsupportedFlavorException(flavor);
return data;I added the class "TreeDropTarget".
"TreeDropTarget" extends the class "DropTarget", which implements the interface "DropTargetListener".
DropTargetListener has a few methods, that are called automatically by Swing during drag operation
(dragOver, dragExit, drop). So we can implement "autoscroll", as well as "automatic node expansion".
With "automatic node expansion", a collapsed node will be expanded,
so that its children become visible and we can do a drop on them:
package demo;
* AutoScroll.java
* source level 1.4
import javax.swing.*;
import javax.swing.tree.*;
import java.awt.*;
import java.awt.datatransfer.*;
import java.awt.dnd.*;
import java.io.*;
import java.util.*;
public class AutoScroll extends JFrame {
public static void main(String[] args) {
new AutoScroll();
public AutoScroll() throws HeadlessException {
super("AutoScroll " + System.getProperty("java.version"));
setDefaultCloseOperation(EXIT_ON_CLOSE);
JTree tree = new JTree();
tree.setDragEnabled(true);
tree.setTransferHandler(new MyTransferHandler());
tree.setDropTarget(new TreeDropTarget());//<----------------------
expand(tree, tree.getPathForRow(0));
JScrollPane sp = new JScrollPane(tree);
sp.setPreferredSize(new Dimension(300, 200));
Container content = getContentPane();
content.setLayout(new BorderLayout());
content.add(sp, BorderLayout.CENTER);
pack();
setVisible(true);
private void expand(JTree tree, TreePath path) {
TreeNode node = (TreeNode) path.getLastPathComponent();
for (Enumeration e = node.children(); e.hasMoreElements();) {
TreeNode n = (TreeNode) e.nextElement();
TreePath newPath = path.pathByAddingChild(n);
expand(tree, newPath);
tree.expandPath(path);
private class MyTransferHandler extends TransferHandler {
private DataFlavor localStringFlavor;
private String localStringType = DataFlavor.javaJVMLocalObjectMimeType + ";class=java.lang.String";
private AutoScroll.MyTransferHandler.StringTransferable transferable;
private MyTransferHandler() {
try {
localStringFlavor = new DataFlavor(localStringType);
} catch (ClassNotFoundException e) {
e.printStackTrace();
protected void exportDone(JComponent comp, Transferable t, int action) {
if (t == null) {
t = transferable;
if (!canImport(comp, t.getTransferDataFlavors())) {
return;
String data = null;
try {
if (hasLocalStringFlavor(t.getTransferDataFlavors())) {
data = (String) t.getTransferData(localStringFlavor);
} else {
return;
} catch (UnsupportedFlavorException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
String location = null;
if (comp instanceof JTree) {
location = ((JTree) comp).getSelectionPath().toString();
System.out.println("Dropping [" + data + "] on location [" + location + "]");
return;
private boolean hasLocalStringFlavor(DataFlavor[] flavors) {
if (localStringFlavor == null) {
return false;
for (int i = 0; i < flavors.length; i++) {
if (flavors.equals(localStringFlavor)) {
return true;
return false;
public boolean canImport(JComponent comp, DataFlavor[] flavors) {
return hasLocalStringFlavor(flavors);
protected Transferable createTransferable(JComponent c) {
if (c instanceof JTree) {
String toTransfer = ((JTree) c).getSelectionPath().toString();
System.out.println("Creating transferable [" + toTransfer + "]");
transferable = new StringTransferable(toTransfer);
return transferable;
System.out.println("Could not create transferable");
return null;
public int getSourceActions(JComponent c) {
return COPY_OR_MOVE;
private class StringTransferable implements Transferable {
private String data;
private StringTransferable(String data) {
this.data = data;
public DataFlavor[] getTransferDataFlavors() {
return new DataFlavor[]{localStringFlavor};
public boolean isDataFlavorSupported(DataFlavor flavor) {
return localStringFlavor.equals(flavor);
public Object getTransferData(DataFlavor flavor) throws UnsupportedFlavorException, IOException {
if (!isDataFlavorSupported(flavor)) {
throw new UnsupportedFlavorException(flavor);
return data;
class TreeDropTarget extends DropTarget {
public TreeDropTarget() {
super();
public void dragOver(DropTargetDragEvent dtde) {
JTree tree = (JTree) dtde.getDropTargetContext().getComponent();
Point loc = dtde.getLocation();
updateDragMark(tree, loc);
autoscroll(tree, loc);
super.dragOver(dtde);
private Insets getAutoscrollInsets() {
return autoscrollInsets;
private void autoscroll(JTree tree, Point cursorLocation) {
Insets insets = getAutoscrollInsets();
Rectangle outer = tree.getVisibleRect();
Rectangle inner = new Rectangle(
outer.x + insets.left,
outer.y + insets.top,
outer.width - (insets.left + insets.right),
outer.height - (insets.top + insets.bottom));
if (!inner.contains(cursorLocation)) {
Rectangle scrollRect = new Rectangle(
cursorLocation.x - insets.left,
cursorLocation.y - insets.top,
insets.left + insets.right,
insets.top + insets.bottom);
tree.scrollRectToVisible(scrollRect);
public void updateDragMark(JTree tree, Point location) {
int row = tree.getRowForPath(tree.getClosestPathForLocation(location.x, location.y));
TreePath path = tree.getPathForRow(row);
if (path != null) {
markNode(tree, location);
private void markNode(JTree tree, Point location) {
TreePath path = tree.getClosestPathForLocation(location.x, location.y);
if (path != null) {
if (lastRowBounds != null) {
Graphics g = tree.getGraphics();
g.setColor(Color.white);
g.drawLine(lastRowBounds.x, lastRowBounds.y,
lastRowBounds.x + lastRowBounds.width, lastRowBounds.y);
tree.setSelectionPath(path);
tree.expandPath(path);
private Rectangle lastRowBounds;
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Change AutoScroll Bounds in JTextPane
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I have provided this example to use as a starting point. It doesn't do anything of use right now. I have tried about 20 things, but things have gotten so messed up, and the level of internal code that I started to mess around with got way over my head... so I'm just going to post this with a clean start, and hopefully we can move in a positive direction. I will relay my findings about a paticular route if we start moving down one i've already failed at.
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import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextPane;
import javax.swing.text.BadLocationException;
import javax.swing.text.StyledDocument;
public class AutoScrollTest extends JFrame
//DATA
private static final int Y_SCROLL_THRESHOLD = 150;
//GUI
private JPanel glassPanel;
private JScrollPane scrollPane;
private JTextPane textPane;
public AutoScrollTest()
this.setDefaultCloseOperation(javax.swing.JFrame.EXIT_ON_CLOSE);
this.setGlassPane(getGlassPanel());
this.setContentPane(getScrollPane());
getGlassPanel().setVisible(true);
this.pack();
this.setVisible(true);
private JPanel getGlassPanel()
if(glassPanel == null)
glassPanel = new JPanel()
public void paintComponent(Graphics g)
super.paintComponent(g);
g.setColor(Color.BLACK);
g.drawLine(0, Y_SCROLL_THRESHOLD, 300, Y_SCROLL_THRESHOLD);
glassPanel.setOpaque(false);
return glassPanel;
private JScrollPane getScrollPane()
if(scrollPane == null)
scrollPane = new JScrollPane(getTextPane());
scrollPane.setPreferredSize(new Dimension(300,300));
return scrollPane;
private JTextPane getTextPane()
if(textPane == null)
textPane = new JTextPane();
try
StyledDocument sd = textPane.getStyledDocument();
for(int i=1; i<1000; i++)
sd.insertString(sd.getLength(),"This is line: " + i + "\n", null);
catch(BadLocationException ble)
ble.printStackTrace();
return textPane;
public static void main(String args[])
new AutoScrollTest();
}camickr & StanislavL:
Great work guys. I have used both of your ideas... and it works GREAT! I'll split the dukes between you.
Please take a look at the finished code, its very cool. Again, thanks.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.text.*;
public class AutoScrollTest extends JFrame
//DATA
private static final int Y_SCROLL_THRESHOLD = 150;
private Timer scrollTimer;
//GUI
private JPanel glassPanel;
private JScrollPane scrollPane;
private JTextPane textPane;
public AutoScrollTest()
this.setDefaultCloseOperation(javax.swing.JFrame.EXIT_ON_CLOSE);
this.setGlassPane(getGlassPanel());
this.setContentPane(getScrollPane());
getGlassPanel().setVisible(true);
this.pack();
this.setVisible(true);
private JPanel getGlassPanel()
if(glassPanel == null)
glassPanel = new JPanel()
public void paintComponent(Graphics g)
super.paintComponent(g);
g.setColor(Color.BLACK);
g.drawLine(0, Y_SCROLL_THRESHOLD, 300, Y_SCROLL_THRESHOLD);
glassPanel.setOpaque(false);
return glassPanel;
private JScrollPane getScrollPane()
if(scrollPane == null)
scrollPane = new JScrollPane(getTextPane());
scrollPane.setPreferredSize(new Dimension(300,300));
return scrollPane;
private JTextPane getTextPane()
if(textPane == null)
textPane = new JTextPane();
MouseInputAdapter mia = new MouseInputAdapter()
public void mouseDragged(MouseEvent e)
Point viewPortPoint = getScrollPane().getViewport().getViewPosition();
if(e.getY()-viewPortPoint.getY() > Y_SCROLL_THRESHOLD)
getScrollTimer().start();
else
getScrollTimer().stop();
public void mouseReleased(MouseEvent e)
getScrollTimer().stop();
textPane.addMouseListener(mia);
textPane.addMouseMotionListener(mia);
try
StyledDocument sd = textPane.getStyledDocument();
for(int i=1; i<1000; i++)
sd.insertString(sd.getLength(),"This is line: " + i + "\n", null);
catch(BadLocationException ble)
ble.printStackTrace();
return textPane;
private Timer getScrollTimer()
if(scrollTimer == null)
scrollTimer = new Timer(60,new MyScrollListener(getTextPane(),getScrollPane().getVerticalScrollBar()));
return scrollTimer;
public static void main(String args[])
new AutoScrollTest();
class MyScrollListener implements ActionListener
private JTextPane textPane;
private JScrollBar scrollBar;
public MyScrollListener(JTextPane textPane, JScrollBar scrollBar)
this.scrollBar = scrollBar;
this.textPane = textPane;
public void actionPerformed(ActionEvent e)
//Move down the scrollbar
scrollBar.setValue(scrollBar.getValue()+scrollBar.getBlockIncrement());
//Update the mouse highlight
PointerInfo mousePointerInfo = MouseInfo.getPointerInfo();
Point convertedPoint = SwingUtilities.convertPoint(null,mousePointerInfo.getLocation(),textPane);
Position.Bias[] bias = new Position.Bias[1];
int mouseOffset = textPane.getUI().viewToModel(textPane,convertedPoint, bias);
if (bias[0] == Position.Bias.Backward && mouseOffset != 0)
--mouseOffset;
textPane.setSelectionEnd(mouseOffset);
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