我想创建一个弹出菜单，如果我在画布上点击右键将出现。 我怎样才能做到这一点？ 这功能我应该修改？ 任何帮助，将不胜感激。
Answer 1:
下面的代码将创建时右击无论是在顶点或在画布上弹出菜单...
/**
* a GraphMousePlugin that offers popup
* menu support
*/
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
*/
protected void handlePopup(MouseEvent e) {
final VisualizationViewer<GeoLocation.Station,GeoLocation.Link> vv =
(VisualizationViewer<GeoLocation.Station,GeoLocation.Link>)e.getSource();
final Point2D p = e.getPoint();
final Point2D ivp = p;
GraphElementAccessor<GeoLocation.Station,GeoLocation.Link> pickSupport = vv.getPickSupport();
if(pickSupport != null) {
JPopupMenu popup = new JPopupMenu();
final GeoLocation.Station station = pickSupport.getVertex(vv.getGraphLayout(), ivp.getX(), ivp.getY());
if(station != null) {
boolean isRadio = station.getParentSet().contains(STATION_IDENTIFIER_KEY);
if(isRadio)
if (station.getId().equalsIgnoreCase(SneakPeek.getUsername())){
String follow = "Follow " + station.getId();
if (followLocal){
follow = "Do not follow " + station.getId();
}
else {
follow = "Follow " + station.getId();
}
popup.add(new AbstractAction("<html><center>" + follow) {
public void actionPerformed(ActionEvent e) {
followLocal = !followLocal;
}
});
}
if(popup.getComponentCount() > 0) {
popup.show(vv, e.getX(), e.getY());
}
}
}
else { //to pop-up over the canvas/layout rather than over the station
popup.add(new AbstractAction("Create Unit") {
public void actionPerformed(ActionEvent e) {
//do something here
}
});
if(popup.getComponentCount() > 0) {
popup.show(vv, e.getX(), e.getY());
}
}
}
}
添加类为AbstractModalGraphMouse它处理鼠标监听器，使其工作类：
private AbstractModalGraphMouse graphMouse;
...
graphMouse = new DefaultModalGraphMouse<Object, Object>();
vvMap.setGraphMouse(graphMouse);
graphMouse.add(new PopupGraphMousePlugin());
上面的代码做的工作。 但是，如果使用不同的用户数据为通用零件，那么你需要修改代码以满足您的设计。
Answer 2:
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
那从你的第一代码的一个
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));
Answer 3:
这不是一个特别问题JUNG - 画布只是一个标准问题摆画布嫁接一些额外的功能，而你没有点击的图形元素 - 但GraphEditorDemo和PluggableRendererDemo展示类似的东西。
Answer 4:
protected void handlePopup(MouseEvent e) {
final VisualizationViewer<Integer,Number> vv = (VisualizationViewer<Integer,Number>)e.getSource();
Point2D p = e.getPoint();
//vv.getRenderContext().getBasicTransformer().inverseViewTransform(e.getPoint());
GraphElementAccessor<Integer,Number> pickSupport = vv.getPickSupport();
if(pickSupport != null) {
System.out.println("POPUP MOUSE is not NULL!");
final Integer v = pickSupport.getVertex(vv.getGraphLayout(), p.getX(), p.getY());
if(v != null) {
JPopupMenu popup = new JPopupMenu();
popup.add(new AbstractAction("Decrease Transparency") {
public void actionPerformed(ActionEvent e) {
Double value = Math.min(1,transparency.get(v).doubleValue()+0.1);
transparency.put(v, value);//vertex, value
vv.repaint();
}
});
popup.add(new AbstractAction("Increase Transparency"){
public void actionPerformed(ActionEvent e) {
Double value = Math.max(0,
transparency.get(v).doubleValue()-0.1);
transparency.put(v, value);
vv.repaint();
}
});
popup.show(vv, e.getX(), e.getY());
}
else {
final Number edge = pickSupport.getEdge(vv.getGraphLayout(), p.getX(), p.getY());
if(edge != null) {
JPopupMenu popup = new JPopupMenu();
popup.add(new AbstractAction(edge.toString()) {
public void actionPerformed(ActionEvent e) {
System.err.println("got "+edge);
}
});//popup.add
popup.show(vv, e.getX(), e.getY());
}//if edge != null)
}
}// if(pickSupport != null)
//rightclicked on Canvas
else{
System.out.println("On Canvas!");
}
}//handlePopup(MouseEvent e)
文章来源: Pop-up menu using mouse rightclick in JUNG
