OrangePositionHandler.java

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 ** This demo file is part of yFiles for JavaFX 3.6.
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package input.positionhandler;

import com.yworks.yfiles.geometry.PointD;
import com.yworks.yfiles.geometry.RectD;
import com.yworks.yfiles.graph.INode;
import com.yworks.yfiles.view.input.ConstrainedPositionHandler;
import com.yworks.yfiles.view.input.IInputModeContext;
import com.yworks.yfiles.view.input.IPositionHandler;
import javafx.scene.shape.Rectangle;

/**
 * A {@link ConstrainedPositionHandler} that limits the movement of a
 * node to be within an rectangle and delegates for other aspects to another (the original) handler.
 */
class OrangePositionHandler extends ConstrainedPositionHandler {
  private final Rectangle boundaryRectangle;
  private final INode node;
  private RectD boundaryPositionRectangle;

  OrangePositionHandler(Rectangle boundaryRectangle, INode node, IPositionHandler delegateHandler) {
    super(delegateHandler);
    this.boundaryRectangle = boundaryRectangle;
    this.node = node;
  }

  /**
   * Prepares the rectangle that is actually used to limit the node
   * position, besides the base functionality. Since a position handler
   * works on points, the actual rectangle must be a limit for the upper
   * left corner of the node and not for the node's bounding box.
   */
  protected void onInitialized(IInputModeContext inputModeContext, PointD originalLocation) {
    super.onInitialized(inputModeContext, originalLocation);
    // Shrink the rectangle by the node size to get the limits for the upper left node corner
    boundaryPositionRectangle = new RectD(
        boundaryRectangle.getX(),
        boundaryRectangle.getY(),
        boundaryRectangle.getWidth() - node.getLayout().getWidth(),
        boundaryRectangle.getHeight() - node.getLayout().getHeight());
  }

  /**
   * Returns the position that is constrained by the rectangle.
   */
  protected PointD constrainNewLocation(IInputModeContext context, PointD originalLocation, PointD newLocation) {
    return newLocation.getConstrained(boundaryPositionRectangle);
  }
}