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Yes, I encountered the same problem... I got part (or all)
of this code somewhere on the internet. Use this for your
JTree...
import java.awt.*;
import java.awt.dnd.*;
import
java.awt.datatransfer.*;
import java.awt.event.*;
import
java.io.*;
import java.util.*;
import javax.swing.*;
import
javax.swing.tree.*;
public class AutoScrollingJTree extends JTree implements
Autoscroll {
private int margin = 12;
public AutoScrollingJTree()
{
super();
}
public AutoScrollingJTree(DefaultMutableTreeNode
dmtn)
{
super(dmtn);
}
// Ok, we’ve
been told to scroll because the mouse cursor is in our
// scroll
zone.
public void autoscroll(Point p)
{
int realrow = getRowForLocation(p.x,
p.y);
Rectangle outer = getBounds();
realrow = (p.y + outer.y <= margin ?
realrow < 1 ? 0 : realrow - 1
:
realrow < getRowCount() - 1 ? realrow + 1 :
realrow);
scrollRowToVisible(realrow);
}
// Calculate the insets for the *JTREE*, not the
viewport
// the tree is in. This makes it a bit messy.
public Insets getAutoscrollInsets()
{
Rectangle
outer = getBounds();
Rectangle inner =
getParent().getBounds();
return new
Insets(
inner.y - outer.y + margin, inner.x - outer.x +
margin,
outer.height - inner.height - inner.y + outer.y +
margin,
outer.width - inner.width - inner.x + outer.x +
margin);
}
}
Does anyone know how to make a Swing
JScrollPane autoscroll during a drag? For example, if I have a JTree in a
JScrollPane, and the tree has nodes not visible, I should be able to “drag and
drop” onto one of the non-visible nodes by autoscrolling during the drag and
drop operation. Any ideas? I have tried
JScrollPane.SetAutoScrolls(true), but that does not seem to work.
Thanks,
David
L. Connerth
Director, Digital
Collections Development
Gannett Media
Technologies International
513.587.2941 Phone
513.241.7219 Fax
dconnerth@xxxxxxxxxxxxxxxx
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