panelfocusaction.java

一个简单的图书馆的管理系统,该系统主要是针对学校的图书馆而做的

package librarymanagement.action.bookMangementAction;

import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;

import javax.swing.JPanel;

public class PanelFocusAction extends KeyAdapter{
  //要添加事件的组件所属的容器
  private JPanel panel;
  //给容器中第几个组件添加事件
  private int i=0;
  public PanelFocusAction(JPanel panel,int i){
    this.panel = panel;
    this.i = i;
  }
  public void keyPressed(KeyEvent e){
    int ch = e.getKeyCode();
    if (ch == KeyEvent.VK_DOWN || ch == KeyEvent.VK_ENTER) {
      if (i < 19) {
       panel.getComponent(i+2).requestFocus();
       }
    }
    if (ch == KeyEvent.VK_UP) {
      if (i >2) {
        panel.getComponent(i - 2).requestFocus();
         }
    }
  }
}