重点关注一个JPanel [英] Obtaining focus on a JPanel

问题描述

在 JFrame 中有一个 JPanel 。我已经注册了一个 KeyListener ，我想更新 JPanel 。我遇到的问题是我不能把重点放在 JPanel 上，因此我的 KeyListener 不起作用。我已经知道 KeyListener 是功能性的，因为我使用 JFrame 注册它，并且它工作正常。我的代码现在是这样的：

  myFrame.setFocusable（false）; 
 myPanel.setFocusable（true）; 
 myPanel.addKeyListener（myKL）; 
 myFrame.add（myPanel）; 
  

有没有人遇到过这样的问题？有没有什么我缺少这方面的？

PS：我没有任何组件在 JPanel 我只是在背景上绘制一个图像，所以我需要把焦点放在JPanel本身上，而不是放在JPanel里面的东西上。 解决方案

p>虽然您表示该面板可以进行对焦，但面板并没有要求重点关注。尝试使用 myPanel.requestFocus（）; 。

I have a JPanel inside a JFrame. I have registered a KeyListener, based on which I want to update the JPanel. The problem I am having is that I cannot get the focus on the JPanel and therefore my KeyListener won't work. I already know that the KeyListener is functional because I registered it with the JFrame and it worked fine. My code goes something like this at the moment:

myFrame.setFocusable(false);
myPanel.setFocusable(true);
myPanel.addKeyListener(myKL);
myFrame.add(myPanel);

Has anyone encountered a problem like this before? Is there something I am missing in regards to this?

P.S.: I do not have any components inside the JPanel I just draw an Image on the background, so I need the focus to be on the JPanel itself and not on something inside it.

解决方案

Although you're indicating that the panel can be focusable, the panel isn't asking for focus. Try using myPanel.requestFocus();.

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