我想创建一个弹出菜单，如果我右键单击画布，就会出现该菜单。我怎样才能做到这一点？我应该修改哪个函数？任何帮助，将不胜感激。
protected class PopupGraphMousePlugin extends AbstractPopupGraphMousePlugin implements MouseListener {
public PopupGraphMousePlugin() {
this(MouseEvent.BUTTON3_MASK);
}
public PopupGraphMousePlugin(int modifiers) {
super(modifiers);
}
/**
* If this event is over a station (vertex), pop up a menu to
* allow the user to perform a few actions; else, pop up a menu over the layout/canvas
*
* @param e
*/
@SuppressWarnings("unchecked")
protected void handlePopup(MouseEvent e) {
final VisualizationViewer<String,String> vv =(VisualizationViewer<String,String>)e.getSource();
final Point2D p = e.getPoint();
final Point2D ivp = p;
JPopupMenu popup = new JPopupMenu();
System.out.println("mouse event!");
GraphElementAccessor<String,String> pickSupport = vv.getPickSupport();
System.out.println("GraphElementAccessor!");
if(pickSupport != null) {
final String pickV = pickSupport.getVertex(vv.getGraphLayout(), ivp.getX(), ivp.getY());
if(pickV != null) {
System.out.println("pickVisnotNull");
popup.add(new AbstractAction("Add New") {
/**
*
*/
public void actionPerformed(ActionEvent e) {
System.out.println("person added");
}
});//new abstraction
}
}///if picksupport
}//handlePopup(MouseEvent e)
}//PopupGraphMousePlugin
这就是你的第一个代码中的代码
这是第二部分
/Next, let's just build a simple mouse, to allow picking, translating, and zooming.
AbstractModalGraphMouse gMouse = new DefaultModalGraphMouse<Object, Object>();
vv.setGraphMouse(gMouse); //Add the mouse to our Visualization-Viewer.
//PluggableGraphMouse pgm = new PluggableGraphMouse();
gMouse.add(new PickingGraphMousePlugin<Object, Object>());
//pgm.add(new TranslatingGraphMousePlugin(MouseEvent.BUTTON3_MASK));
gMouse.add(new PopupGraphMousePlugin());
gMouse.add(new ScalingGraphMousePlugin(new CrossoverScalingControl(), 0, 1 / 1.1f, 1.1f));
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