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2    * This demo file is part of yFiles for Java 2.14.
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4    * 72070 Tuebingen, Germany. All rights reserved.
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11   * demo is shipped with are allowed to use the demo source code as basis
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13   * governed by the rights and conditions as set out in the yFiles for Java
14   * license agreement.
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28  package demo.view.advanced.ports;
29  
30  import y.base.Node;
31  import y.view.CreateEdgeMode;
32  
33  /**
34   * Custom <code>CreateEdgeMode</code> implementation that restricts edge
35   * creation to nodes with node ports. 
36   *
37   */
38  class PortCreateEdgeMode extends CreateEdgeMode {
39    /**
40     * Overwritten to accept only nodes with node ports.
41     * @param source the node to check.
42     * @param x the x-coordinate of the mouse event that triggered edge creation
43     * for the specified node.
44     * @param y the y-coordinate of the mouse event that triggered edge creation
45     * for the specified node.
46     * @return <code>true<code> if the specified node has node ports;
47     * <code>false</code> otherwise.
48     */
49    protected boolean acceptSourceNode( final Node source, final double x, final double y ) {
50      return hasPorts(source);
51    }
52  
53    /**
54     * Overwritten to accept only nodes with node ports.
55     * @param target the node to check.
56     * @param x the x-coordinate of the mouse event that triggered edge creation
57     * for the specified node.
58     * @param y the y-coordinate of the mouse event that triggered edge creation
59     * for the specified node.
60     * @return <code>true<code> if the specified node has node ports;
61     * <code>false</code> otherwise.
62     */
63    protected boolean acceptTargetNode( final Node target, final double x, final double y ) {
64      return hasPorts(target);
65    }
66  
67    private boolean hasPorts( final Node node ) {
68      return view.getGraph2D().getRealizer(node).portCount() > 0;
69    }
70  }
71