我正在构建一个InputMap和ActionMap来将键绑定到方法。许多键会做类似的事情。对于每个绑定键,我在InputMap中都有一个条目。我想将几个InputMap条目与相同的ActionMap条目相关联,并在AbstractAction.actionPerformed(ActionEvent event)方法中使用ActionEvent参数来确定按下/释放/键入了哪个键。我查看了getID(),并进行了测试以查看ActionEvent是否为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条目都设置一个参数,然后调用我的(参数化)方法吗?
这是有效的方法(但很冗长):
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");
}
});
这是我想做的但找不到魔术的方法:
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;
}
}
};
最佳答案
您应该首先尝试这种简单的逻辑。
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,您可以添加许多自定义按键组合和操作,并通过switch进行更改。