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 = null;  private EndBean end=new EndBean();;  private ActivityBean activity = null;//  private boolean b_start=false;//開始圖標(biāo)只能有一個(gè)。當(dāng)前為0個(gè)//  private boolean b_end=false;//結(jié)束圖標(biāo)只能有一個(gè)。當(dāng)前為0個(gè)  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(biāo)        //如果點(diǎn)中線，彈出對話框        break;      case Mouse.ACTIVITY://活動(dòng)鼠標(biāo)        activity=new ActivityBean();        activity.setText("活動(dòng)"+i);        //初始位置在鼠標(biāo)的周圍。鼠標(biāo)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(biāo)只能有一個(gè)。重置鼠標(biāo)狀態(tài)        return;      case Mouse.START:{//開始鼠標(biāo)//        if(b_start) {//“開始”只能有一個(gè)//          //彈出消息框，提示用戶開始圖標(biāo)已經(jīng)有了//          JLabel message=new JLabel("警告：不能重復(fù)加入開始圖標(biāo)！");//          message.setFont(new java.awt.Font("宋體", 0, 12));//          JOptionPane.showMessageDialog(this,message);//          Mouse.setState(Mouse.NORMAL);//          return;//        }        start=new StartBean();        start.setLocation(e.getX()-start.getWidth()/2,e.getY()-start.getHeight()/2);        add(start);        start.requestFocus();        //開始圖標(biāo)只能有一個(gè)。重置鼠標(biāo)狀態(tài)//        b_start=true;        Mouse.setState(Mouse.NORMAL);        return;      }    case Mouse.END:{//結(jié)束鼠標(biāo)//      if(b_end) {//        //彈出消息框，提示用戶結(jié)束圖標(biāo)已經(jīng)有了//        JLabel message=new JLabel("警告：不能重復(fù)加入結(jié)束圖標(biāo)！");//        message.setFont(new java.awt.Font("宋體", 0, 12));//        JOptionPane.showMessageDialog(this,message);//        Mouse.setState(Mouse.NORMAL);//        return;//      }      int i = this.getIndexOf(end);      if(i==-1) {//表明該控件仍然沒有      //System.out.println("i="+i);        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(fù)加入結(jié)束圖標(biāo)！");        message.setFont(new java.awt.Font("宋體", 0, 12));        JOptionPane.showMessageDialog(this,message);      }      Mouse.setState(Mouse.NORMAL);      return;    }    }  }//  public void paint(Graphics g) {//    //畫線//    super.paint(g);//  }}