JUNG-边缘采摘（鼠标事件）

Question

我在处理JUNG图上的挑选事件时遇到了一些麻烦。我一直在使用GraphMouseListener接口来监听顶点的点击，但是现在我需要添加对拾取边的支持，而且我似乎无法找到在文档上执行的方法。

任何指针？

谢谢

Answer 1

通过添加项侦听到顶点和边的拍摄状态解决它：

visualizationViewer.getPickedEdgeState().addItemListener(new EdgePickListener()); 

Answer 2

您也可以创建自己的MouseEdgeListenerTranslator：

import java.awt.event.MouseAdapter; 
import java.awt.event.MouseEvent; 
import java.awt.geom.Point2D; 

import edu.uci.ics.jung.algorithms.layout.GraphElementAccessor; 
import edu.uci.ics.jung.algorithms.layout.Layout; 
import edu.uci.ics.jung.visualization.VisualizationViewer; 

public class MouseEdgeListenerTranslator<V,E> extends MouseAdapter { 

    private VisualizationViewer<V,E> vv; 
    private GraphEdgeMouseListener<E> geml; 

    public MouseEdgeListenerTranslator(GraphEdgeMouseListener<E> geml, VisualizationViewer<V,E> vv){ 
     this.geml = geml; 
     this.vv = vv; 
    } 

    private E getEdge(Point2D point){ 
     Point2D p = point; 
     GraphElementAccessor<V,E> pickSupport = vv.getPickSupport(); 
     Layout<V,E> layout = vv.getGraphLayout(); 
     E e = null; 
     if(pickSupport != null){ 
      e = pickSupport.getEdge(layout, p.getX(), p.getY()); 
     } 
     return e; 
    } 

    public void mouseClicked(MouseEvent me){ 
     E e = getEdge(me.getPoint()); 
     if(e != null){ 
      geml.graphClicked(e, me); 
     } 
    } 

    public void mousePressed(MouseEvent me){ 
     E e = getEdge(me.getPoint()); 
     if(e != null){ 
      geml.graphPressed(e, me); 
     } 
    } 

    public void mouseReleased(MouseEvent me){ 
     E e = getEdge(me.getPoint()); 
     if(e != null){ 
      geml.graphReleased(e, me); 
     } 
    } 

}  

，然后添加它在GraphEdgeMouseListener中属于您自己的VisualizationViewer的子类：

import edu.uci.ics.jung.visualization.VisualizationModel; 
import edu.uci.ics.jung.visualization.VisualizationViewer; 

public class MyVisualizationViewer<V,E> extends VisualizationViewer<V,E> { 

    public MyVisualizationViewer(VisualizationModel<V,E> visualizationModel, Dimension size){ 
     super(visualizationModel, size); 
    } 

    public void addGraphEdgeMouseListener(GraphEdgeMouseListener<E> geml){ 
     addMouseListener(new MouseEdgeListenerTranslator<V,E>(geml, this)); 
    } 

} 

和

import java.awt.event.MouseEvent; 

public interface GraphEdgeMouseListener<E> { 

    void graphClicked(E e, MouseEvent me); 
    void graphPressed(E e, MouseEvent me); 
    void graphReleased(E e, MouseEvent me); 

}