LabelInsetsProvider.java

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package complete.hierarchicgrouping;

import com.yworks.yfiles.geometry.InsetsD;
import com.yworks.yfiles.graph.ILabel;
import com.yworks.yfiles.graph.INode;
import com.yworks.yfiles.view.input.INodeInsetsProvider;

/**
 * Provides insets for node instances via the insets suggested by the labels.
 */
class LabelInsetsProvider implements INodeInsetsProvider {

  private final InsetsD outerInsets;

  /**
   * Initializes a new <code>LabelInsetsProvider</code> instance with empty outer insets.
   */
  LabelInsetsProvider() {
    this(InsetsD.EMPTY);
  }

  /**
   * Initializes a new <code>LabelInsetsProvider</code> instance with the given outer insets.
   * @param outerInsets the outer insets to consider
   */
  LabelInsetsProvider(InsetsD outerInsets) {
    this.outerInsets = outerInsets;
  }

  @Override
  public InsetsD getInsets(INode item) {
    InsetsD result = InsetsD.EMPTY;
    for (ILabel label : item.getLabels()) {
      INodeInsetsProvider provider = label.getLayoutParameter().getModel().lookup(INodeInsetsProvider.class);
      if (provider != null) {
        InsetsD insets = provider.getInsets(item);
        result = result.createUnion(insets);
      }
    }
    // add outer insets for labels and a small gap to the group bounds
    return result.createUnion(outerInsets).getEnlarged(new InsetsD(5));
  }
}