package com.wiziflow.gui;import javax.swing.*;import java.awt.event.*;import java.awt.*;/** * 工作流定義區(qū) */public class FlowPane extends JLayeredPane {  private StartBean start=new StartBean();  private EndBean end=new EndBean();;  private ActivityBean activity = null;  int i=1;  public FlowPane() {    super();    try {      jbInit();    }    catch(Exception e) {      e.printStackTrace();    }  }  private void jbInit() throws Exception {    this.addMouseListener(new java.awt.event.MouseAdapter() {      public void mousePressed(MouseEvent e) {        this_mousePressed(e);      }    });  }  void this_mousePressed(MouseEvent e) {    switch(Mouse.STATE) {      case Mouse.NORMAL://普通鼠標        //如果點中線，彈出對話框        break;      case Mouse.ACTIVITY://活動鼠標        activity=new ActivityBean();        activity.setText("活動"+i);        //初始位置在鼠標的周圍。鼠標位于中間        activity.setLocation(e.getX()-activity.getWidth()/2,e.getY()-activity.getHeight()/2);        add(activity);        activity.requestFocus();        Mouse.setState(Mouse.NORMAL);        i++;        //開始圖標只能有一個。重置鼠標狀態(tài)        break;      case Mouse.START:{//開始鼠標        if(getIndexOf(end)==-1) {//表明該控件仍然沒有          start.setLocation(e.getX()-start.getWidth()/2,e.getY()-start.getHeight()/2);          add(start);          start.requestFocus();        }else{          JLabel message=new JLabel("警告：不能重復加入開始圖標！");          message.setFont(new java.awt.Font("宋體", 0, 12));          JOptionPane.showMessageDialog(this,message);        }        Mouse.setState(Mouse.NORMAL);        break;      }    case Mouse.END:{//結束鼠標      if(getIndexOf(end)==-1) {//表明該控件仍然沒有        end.setLocation(e.getX()-end.getWidth()/2,e.getY()-end.getHeight()/2);        add(end);        end.requestFocus();      }else{        JLabel message=new JLabel("警告：不能重復加入結束圖標！");        message.setFont(new java.awt.Font("宋體", 0, 12));        JOptionPane.showMessageDialog(this,message);      }      Mouse.setState(Mouse.NORMAL);      break;    }    }  }//  public void paint(Graphics g) {//    //畫線//    super.paint(g);//  }}