/*
 * Licensed Materials - Property of Perforce Software, Inc. 
 * © Copyright Perforce Software, Inc. 2014, 2021 
 * © Copyright IBM Corp. 2009, 2014
 * © Copyright ILOG 1996, 2009
 * All Rights Reserved.
 *
 * Note to U.S. Government Users Restricted Rights:
 * The Software and Documentation were developed at private expense and
 * are "Commercial Items" as that term is defined at 48 CFR 2.101,
 * consisting of "Commercial Computer Software" and
 * "Commercial Computer Software Documentation", as such terms are
 * used in 48 CFR 12.212 or 48 CFR 227.7202-1 through 227.7202-4,
 * as applicable.
 */
package busLayout;

import ilog.views.graphlayout.IlvGraphLayoutException;
import ilog.views.graphlayout.IlvGraphLayoutReport;
import ilog.views.graphlayout.bus.IlvBusLayout;

/**
 * A subclass of IlvBusLayout that implements a very cheap incremental mode
 * starting from the second layout call. Note that this allows moving nodes. If
 * you want to add/remove nodes while this layout is in place, you need some
 * more elaborate logic.
 */
public class IncrementalBusLayout extends IlvBusLayout {

  private boolean _incrementalMode = false;

  Override
  public void setIncrementalMode(boolean set) {
    _incrementalMode = set;
  }

  Override
  protected void layout(boolean redraw) throws IlvGraphLayoutException {
    if (!_incrementalMode) {
      // The first run is non-incremental.
      super.layout(redraw);
      // And future runs are incremental.
      setIncrementalMode(true);
    } else {
      layoutIncrementally(redraw);
    }
  }

  protected void layoutIncrementally(boolean redraw) throws IlvGraphLayoutException {
    getLayoutReport().setCode(IlvGraphLayoutReport.LAYOUT_DONE);
  }
}