[英]How to listen to vertex selection change in Jung 2?
如何在Jung 2中听取顶点选择的变化? 我一直在尝试使用PropertyChangeListener和ChangeListener。
这在http://kahdev.wordpress.com/2010/02/20/detecting-selection-of-vertices-in-jung/上得到了很好的解释。
只需在VisualizationViewer的PickedVertexState上添加一个监听器:
Graph<Integer, String> basis = new SparseMultigraph<Integer, String>();
final Layout<Integer, String> layout = new CircleLayout<Integer, String>(
basis);
layout.setSize(new Dimension(300, 300));
VisualizationViewer<Integer, String> vv = new VisualizationViewer<Integer, String>(
layout);
final PickedState<Integer> pickedState = vv.getPickedVertexState();
// Attach the listener that will print when the vertices selection changes.
pickedState.addItemListener(new ItemListener() {
@Override
public void itemStateChanged(ItemEvent e) {
Object subject = e.getItem();
// The graph uses Integers for vertices.
if (subject instanceof Integer) {
Integer vertex = (Integer) subject;
if (pickedState.isPicked(vertex)) {
System.out.println("Vertex " + vertex
+ " is now selected");
} else {
System.out.println("Vertex " + vertex
+ " no longer selected");
}
}
}
});
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