java如何确定通过输入/ActionMap绑定触发AbstractAction的键？

Question

我正在构建一个InputMap和ActionMap来将键绑定到方法。许多键都可以做类似的事情。在InputMap中，每个绑定键都有一个条目。我想将几个InputMap条目与同一个ActionMap条目相关联，并在AbstractAction中使用ActionEvent参数。actionPerformed（ActionEvent事件）方法来确定按下/释放/键入的键。我查看了getID（），测试了ActionEvent是否是KeyEvent（不是）。有没有办法做到这一点，或者我必须进行不同的重构，以便每个唯一的ActionMap条目设置一个参数，然后调用我的（参数化）方法

以下是有效（但冗长）的方法：

    getInputMap().put(KeyStroke.getKeyStroke(KeyEvent.VK_RIGHT,0),"myRightHandler");
    getInputMap().put(KeyStroke.getKeyStroke(KeyEvent.VK_LEFT,0),"myLeftHandler");
    getActionMap().put("myRightHandler",new AbstractAction() {
              public void actionPerformed(ActionEvent evt) {
                  System.out.println("Typed Right Arrow");
              }
          });
    getActionMap().put("myLefttHandler",new AbstractAction() {
              public void actionPerformed(ActionEvent evt) {
                  System.out.println("Typed Left Arrow");
              }
          });

以下是我想做但找不到魔力的事情：

    getInputMap().put(KeyStroke.getKeyStroke(KeyEvent.VK_RIGHT,0),"myGenericHandler");
    getInputMap().put(KeyStroke.getKeyStroke(KeyEvent.VK_LEFT,0),"myGenericHandler");
    getActionMap().put("myGenericHandler",new AbstractAction() {
              public void actionPerformed(ActionEvent evt) {
                  // determine what key caused the event...
                  // evt.getKeyCode() does not work.
                  int keyCode = performMagic(evt);
                  switch (keyCode) {
                      case KeyEvent.VK_RIGHT:
                          System.out.println("Typed Right Arrow");
                          break;
                      case KeyEvent.VK_LEFT:
                          System.out.println("Typed Left Arrow");
                          break;
                      default:
                          System.out.println("Typed unknown key");
                          break;
                  }
              }
          };

Answer 1

你应该先试试这个简单的逻辑

getInputMap().put(KeyStroke.getKeyStroke(KeyEvent.VK_RIGHT,0),"myRightHandler");
    getInputMap().put(KeyStroke.getKeyStroke(KeyEvent.VK_LEFT,0),"myLeftHandler");
    getActionMap().put("myRightHandler", new myAction("myRightHandler")); 
    getActionMap().put("myLeftHandler", new myAction("myLeftHandler")); 

    class myAction extends AbstractAction { 

        String str; 

        public myAction(String actName) {

            str = actName; 
        }

        public void actionPerformed(ActionEvent ae) { 

            switch(str) { 

                case "myRightHandler": //Here is code for 'myRightHandler'. 
                break; 

                case "myLeftHandler": //Here is code for 'myLeftHandler'. 
                break; 
                .
                .
                .
                .
                default : //Here is default Action; 
                break;
            }
        }
    } 

现在，通过这种方式，您可以添加许多自定义组合键和操作，并使用switch将它们区分开来