RotationAwareGroupBoundsCalculator.java

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package complete.rotatablenodes;

import com.yworks.yfiles.geometry.InsetsD;
import com.yworks.yfiles.geometry.RectD;
import com.yworks.yfiles.graph.IGraph;
import com.yworks.yfiles.graph.IGroupBoundsCalculator;
import com.yworks.yfiles.graph.INode;
import com.yworks.yfiles.view.input.INodeInsetsProvider;

/**
 * Calculates group bounds taking the rotated layout for nodes which {@link RotatableNodeStyleDecorator}
 * support rotation.
 */
public class RotationAwareGroupBoundsCalculator implements IGroupBoundsCalculator {

  /**
   * Calculates the minimum bounds for the given group node to enclose all its children plus insets.
   */
  @Override
  public RectD calculateBounds(IGraph graph, INode groupNode) {
    RectD bounds = RectD.EMPTY;
    for (INode node : graph.getChildren(groupNode)) {
      if (node.getStyle() instanceof RotatableNodeStyleDecorator) {
        //if the node supports rotation: add the outer bounds of the rotated layout
        RotatableNodeStyleDecorator rotatableWrapper = ((RotatableNodeStyleDecorator) node.getStyle());
        bounds = RectD.add(bounds, rotatableWrapper.getRotatedLayout(node).getBounds());
      } else {
        bounds = RectD.add(bounds, node.getLayout().toRectD());
      }
    }
    //if we have content: add insets
    return bounds.isEmpty() ? bounds : bounds.getEnlarged(getInsets(groupNode));
  }

  /**
   * Returns insets to add to apply to the given groupNode.
   */
  private static InsetsD getInsets(INode groupNode) {
    INodeInsetsProvider provider = groupNode.lookup(INodeInsetsProvider.class);
    if(provider != null) {
      //get insets from the node's insets provider if there is one
      return provider.getInsets(groupNode);
    }
    // otherwise add 5 to each border
    return new InsetsD(5);
  }
}