ActivityLabelModel.java

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 ** This demo file is part of yFiles for JavaFX 3.6.
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 ** Copyright (c) 2000-2023 by yWorks GmbH, Vor dem Kreuzberg 28,
 ** 72070 Tuebingen, Germany. All rights reserved.
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 ** yFiles demo files exhibit yFiles for JavaFX functionalities. Any redistribution
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package viewer.ganttchart;

import com.yworks.yfiles.geometry.IOrientedRectangle;
import com.yworks.yfiles.geometry.IRectangle;
import com.yworks.yfiles.geometry.OrientedRectangle;
import com.yworks.yfiles.graph.ILabel;
import com.yworks.yfiles.graph.ILabelOwner;
import com.yworks.yfiles.graph.ILookup;
import com.yworks.yfiles.graph.INode;
import com.yworks.yfiles.graph.labelmodels.ILabelModel;
import com.yworks.yfiles.graph.labelmodels.ILabelModelParameter;

/**
 * Places node labels of activity nodes between the end of lead time and the
 * start of follow-up time.
 */
public class ActivityLabelModel implements ILabelModel {
  /**
   * Places labels between the end of lead time and the start of follow-up time
   * of an activity node.
   */
  public static final ILabelModelParameter DEFAULT =
    new ActivityParameter(new ActivityLabelModel());

  /**
   * Stretches the given label from the end of lead time to the start of
   * follow-up time of an activity node. 
   */
  @Override
  public IOrientedRectangle getGeometry(
    ILabel label, ILabelModelParameter layoutParameter
  ) {
    if (!(layoutParameter instanceof ActivityParameter)) {
      throw new IllegalArgumentException("Invalid parameter: " + layoutParameter);
    }

    ILabelOwner owner = label.getOwner();
    if (!(owner instanceof INode)) {
      throw new IllegalArgumentException("Invalid label owner: " + owner);
    }

    INode node = (INode) owner;
    Object tag = node.getTag();
    IRectangle nl = node.getLayout();
    double x = nl.getX();
    double w = nl.getWidth();
    if (tag instanceof Activity) {
      Activity activity = (Activity) tag;
      double leadTime = activity.leadTimeWidth();
      double followUpTime = activity.followUpTimeWidth();
      x += leadTime;
      w = Math.max(0, w - leadTime - followUpTime);
    }
    return new OrientedRectangle(x, nl.getMaxY(), w, nl.getHeight());
  }

  /**
   * Returns {@link #DEFAULT}.
   * @return {@link #DEFAULT}.
   */
  @Override
  public ILabelModelParameter createDefaultParameter() {
    return DEFAULT;
  }

  /**
   * Returns an empty context.
   * @return an empty context.
   */
  @Override
  public ILookup getContext( ILabel label, ILabelModelParameter layoutParameter ) {
    return ILookup.EMPTY;
  }

  /**
   * Returns {@code null} for all types.
   * @return {@code null}.
   */
  @Override
  public <TLookup> TLookup lookup( Class<TLookup> type ) {
    return null;
  }


  /**
   * Singleton parameter used for activity node labels.
   */
  private static class ActivityParameter implements ILabelModelParameter {
    private final ActivityLabelModel model;

    ActivityParameter( ActivityLabelModel model ) {
      this.model = model;
    }

    @Override
    public ILabelModel getModel() {
      return model;
    }

    @Override
    public boolean supports( ILabel label ) {
      return label.getOwner() instanceof INode;
    }

    @Override
    public ActivityParameter clone() {
      return this;
    }
  }
}