JTree scroll To Selection - Java Swing

Java examples for Swing:JTree

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Description

JTree scroll To Selection

Demo Code


//package com.java2s;

import java.awt.Point;
import java.awt.Rectangle;

import javax.swing.JTree;
import javax.swing.JViewport;

public class Main {
    public static void scrollToSelection(JTree tree) {
        if (!(tree.getParent() instanceof JViewport))
            return;

        setViewPortPosition((JViewport) tree.getParent(),
                tree.getPathBounds(tree.getSelectionPath()));

    }//from w w w.  ja  v  a 2 s . c o  m

    private static void setViewPortPosition(JViewport viewport,
            Rectangle position) {
        // The location of the viewport relative to the object
        Point pt = viewport.getViewPosition();

        // Translate the cell location so that it is relative
        // to the view, assuming the northwest corner of the
        // view is (0,0)
        position.setLocation(position.x - pt.x, position.y - pt.y);

        // Scroll the area into view
        viewport.scrollRectToVisible(position);
    }
}

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