swing中按钮绑定多个快捷键和实现对鼠标滚轮滚动监听

工作中遇到需求:  给已有的Jbutton添加多个键盘按钮快捷键, 以及使用鼠标滚轮滑动绑定按钮功能,

以下是给按钮添加键盘点击事件,  一个按钮绑定多个按键

 

//先定义鼠标点击监听器
class BrowserButtonActionListener implements ActionListener{
      //上一张
      static final String SELECT_BEFORE = "SELECT_BEFORE";
      static final String SELECT_BEFORE_LEFT = "SELECT_BEFORE_LEFT";
      static final String SELECT_BEFORE_UP = "SELECT_BEFORE_UP";
      //下一张
      static final String SELECT_NEXT = "SELECT_NEXT";
      static final String SELECT_NEXT_RIGHT = "SELECT_NEXT_RIGHT";
      static final String SELECT_NEXT_DOWN = "SELECT_NEXT_DOWN";
          //放大
      static final String ENLATGER = "ENLATGER";
      //缩小
      static final String REDUCE = "REDUCE";
    @Override
    public void actionPerformed(ActionEvent e) {
        String command = e.getActionCommand();
         if(SELECT_BEFORE.equals(command)||
                SELECT_BEFORE_LEFT.equals(command)||
                SELECT_BEFORE_UP.equals(command)){
              // 上一张, 这里逻辑隐去
        }else if(SELECT_NEXT.equals(command)||
                SELECT_NEXT_DOWN.equals(command)||
                SELECT_NEXT_RIGHT.equals(command)){
            //下一张, 隐去
        }else if(ENLATGER.equals(command)){
               //放大
             previewPane.zoomIn();
        }else if(REDUCE.equals(command)){
        //缩小
                     previewPane.zoomOut();
        }else{
            System.out.println("不存在的命令...");
        }  
    }
  }                

//以下是构建按钮和绑定
public void init(){
　　//鼠标点击事件
　　BrowserButtonActionListener buttonActionListener = new BrowserButtonActionListener();

　　JButton preButton = new JButton("上一张");
　　JButton nextButton = new JButton("下一张");
　　JButton zoomInButton = new JButton("放大");
　　JButton zoomOutButton = new JButton("缩小");

　　//以下添加键盘快捷键 ,分别绑定两个按键
　　//左上--上一张
　　preButton.registerKeyboardAction(buttonActionListener,BrowserButtonActionListener.SELECT_BEFORE_LEFT,
　　　　KeyStroke.getKeyStroke(KeyEvent.VK_UP,0),JComponent.WHEN_IN_FOCUSED_WINDOW);
　　preButton.registerKeyboardAction(buttonActionListener,BrowserButtonActionListener.SELECT_BEFORE_UP,
　　　　KeyStroke.getKeyStroke(KeyEvent.VK_LEFT,0),JComponent.WHEN_IN_FOCUSED_WINDOW);
　　//右下 下一张
　　nextButton.registerKeyboardAction(buttonActionListener,BrowserButtonActionListener.SELECT_NEXT_DOWN,
　　　　KeyStroke.getKeyStroke(KeyEvent.VK_DOWN,0),JComponent.WHEN_IN_FOCUSED_WINDOW);
　　nextButton.registerKeyboardAction(buttonActionListener,BrowserButtonActionListener.SELECT_NEXT_RIGHT,
　　　　KeyStroke.getKeyStroke(KeyEvent.VK_RIGHT,0),JComponent.WHEN_IN_FOCUSED_WINDOW);initButton(preButton, BrowserButtonActionListener.SELECT_BEFORE);

//　　
//鼠标滚轮放大缩小用到的鼠标滚轮监听

　　MouseWheelListener mouseWheelListener = new MouseWheelListener() {
　　　　@Override
　　　　public void mouseWheelMoved(MouseWheelEvent e) {
　　　　　　int wheelRotation = e.getWheelRotation();
　　　　　　if(wheelRotation==1){
　　　　　　　　System.out.println("向前/缩小");
　　　　　　　　//previewPane.zoomIn();  //业务实现, 这里不重要
　　　　　　}else if(wheelRotation == -1){
　　　　　　　　System.out.println("向后/放大");
　　　　　　　　//previewPane.zoomOut();
　　　　　　}
　　　　}
　　};

//this 是jpanel
//主体绑定滚轮事件
this.addMouseWheelListener(mouseWheelListener);

//正常的按钮事件绑定
　　initButton(firstButton, BrowserButtonActionListener.SELECT_FIRST);
　　initButton(nextButton, BrowserButtonActionListener.SELECT_NEXT);
}

//绑定事件, 保留默认的手动点击事件,

private void initButton(JButton button,String command){

　　　button.setActionCommand(command);

　　　　button.addActionListener(buttonActionListener);
　　　　toolBar.add(button);
　　}