Example usage for javax.swing JViewport addChangeListener

Introduction

In this page you can find the example usage for javax.swing JViewport addChangeListener.

Prototype

public void addChangeListener(ChangeListener l) 

Source Link

Document

Adds a ChangeListener to the list that is notified each time the view's size, position, or the viewport's extent size has changed.

Usage

From source file:Main.java

public static void synchronizeView(final JViewport masterViewport, final JViewport slaveViewport,
        final int orientation) {
    final ChangeListener c1 = new ChangeListener() {
        public void stateChanged(ChangeEvent e) {
            if (masterViewport.getView() == null || slaveViewport.getView() == null) {
                return;
            }/*from  www. j  a v a 2 s.  c  o m*/
            if (orientation == SwingConstants.HORIZONTAL) {
                Point v1 = masterViewport.getViewPosition();
                Point v2 = slaveViewport.getViewPosition();
                if (v1.x != v2.x) {
                    slaveViewport.setViewPosition(new Point(v1.x, v2.y));
                }
            } else if (orientation == SwingConstants.VERTICAL) {
                Point v1 = masterViewport.getViewPosition();
                Point v2 = slaveViewport.getViewPosition();
                if (v1.y != v2.y) {
                    slaveViewport.setViewPosition(new Point(v2.x, v1.y));
                }
            }
        }
    };

    masterViewport.addChangeListener(c1);
}

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