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Re: Unlimited mouse moves/drags

Here's my implementation using Robot. It was easier than I expected, and works great. To use it, just create an InfiniteDragListener, then listen to it as your source of mouse press, drag, and release events. It prevents the cursor from moving more than a few pixels from the click location, while generating events as if the cursor were moving freely over an unbounded screen. This uses Buoy (http://buoy.sourceforge.net), but it would be easy to create a Swing version.

Peter


import buoy.event.*;
import buoy.widget.*;

import javax.swing.*;
import java.awt.*;

public class InfiniteDragListener extends EventSource
{
  private Widget source;
  private Robot robot;
  private Point startPoint, startScreenPoint, lastPoint;
  private int dx, dy;
  private boolean expectingReset;

  public InfiniteDragListener(Widget source)
  {
    this.source = source;
    source.addEventLink(MousePressedEvent.class, this, "mousePressed");
    source.addEventLink(MouseReleasedEvent.class, this, "mouseReleased");
    source.addEventLink(MouseDraggedEvent.class, this, "mouseDragged");
  }

private void mousePressed(MousePressedEvent ev)
{
startPoint = lastPoint = ev.getPoint();
startScreenPoint = new Point(startPoint);
SwingUtilities.convertPointToScreen(startScreenPoint, source.getComponent());
dx = 0;
dy = 0;
try
{
robot = new Robot(source.getComponent().getGraphicsConfiguration().getDevice());
}
catch (Exception ex)
{
robot = null;
}
dispatchEvent(ev);
}

private void mouseDragged(MouseDraggedEvent ev)
{
if (expectingReset && ev.getPoint().equals(startPoint))
{
dx += lastPoint.x-startPoint.x;
dy += lastPoint.y-startPoint.y;
expectingReset = false;
}
if ((Math.abs(ev.getX()-startPoint.x) > 5 || Math.abs(ev.getY()-startPoint.y) > 5) && robot != null)
{
expectingReset = true;
robot.mouseMove(startScreenPoint.x, startScreenPoint.y);
}
lastPoint = ev.getPoint();
dispatchEvent(new MouseDraggedEvent(source, ev.getWhen(), ev.getModifiersEx(), ev.getX()+dx, ev.getY()+dy));
}

private void mouseReleased(MouseReleasedEvent ev)
{
robot = null;
dispatchEvent(new MouseReleasedEvent(source, ev.getWhen(), ev.getModifiersEx(), ev.getX()+dx, ev.getY()+dy, ev.getClickCount(), ev.isPopupTrigger(), ev.getButton()));
}
}

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References: 
 >Unlimited mouse moves/drags (From: email@hidden)
 >Re: Unlimited mouse moves/drags (From: Rob Cope <email@hidden>)



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