Eclipse GEF and Draw2d Plug-in Developer Guide (Galileo) - FeedbackHelper (Eclipse GEF API Specification)

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org.eclipse.gef.editpolicies
Class FeedbackHelper

java.lang.Object
  
org.eclipse.gef.editpolicies.FeedbackHelper

public class FeedbackHelper
extends java.lang.Object

Helps display connection feedback during drags of the connection ends. This class is used internally by the provided EditPolicy implementation.

Constructor Summary

FeedbackHelper ()
          Constructs a new FeedbackHelper.

Method Summary

protected Connection getConnection ()
          Returns the connection being used to show feedback.

protected boolean isMovingStartAnchor ()
          Returns true is the feedback is moving the source anchor

protected void setAnchor ( ConnectionAnchor anchor)
          Sets the anchor for the end being moved.

void setConnection ( Connection c)
          Sets the connection.

void setMovingStartAnchor (boolean value)
          Sets if moving start of connection.

void update ( ConnectionAnchor anchor, Point p)
          Updates the feedback based on the given anchor or point.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

FeedbackHelper

public FeedbackHelper()

Constructs a new FeedbackHelper.

Method Detail

getConnection

protected 
Connection getConnection()

Returns the connection being used to show feedback.

Returns:: the connection

isMovingStartAnchor

protected boolean isMovingStartAnchor()

Returns true is the feedback is moving the source anchor

Returns:: true if moving start

setConnection

public void setConnection(
Connection c)

Sets the connection.

Parameters:: c - connection

setMovingStartAnchor

public void setMovingStartAnchor(boolean value)

Sets if moving start of connection.

Parameters:: value - true if the starts is being moved

setAnchor

protected void setAnchor(
ConnectionAnchor anchor)

Sets the anchor for the end being moved.

Parameters:: anchor - the new anchor

update

public void update(
ConnectionAnchor anchor,
                   
Point p)

Updates the feedback based on the given anchor or point. The anchor is used unless null. The point is used when there is no anchor.

Parameters:: anchor - null or an anchor; p - the point to use when there is no anchor