调用setVisible(false)后，调用set Visible(true)时我的JFrame内容不见了 [英] After calling setVisible(false) my JFrame contents are gone when calling set Visible(true)

问题描述

我正在设计一个绘图程序(用Java)，该程序应在其中绘制文本.由于我使用kinect进行此操作，因此我想使用已经找到的onscreenKeyboard.这个键盘基本上是一个JFrame的JComponents，我不想详细介绍...

I'm designing a drawing program (in Java) in which text should be drawn. Since I'm doing this with kinect I'd like to use an onscreenKeyboard which I've already found. This keyboard is basically a JFrame witch JComponents in it, I dont't want to go too much in detail ...

public MainFrame() {
    super("Draw");
    setLayout(new BorderLayout());
    setVisible(true);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setLocationRelativeTo(null); //so basically some standard stuff
    makeGUI();
    this.keyboard = new start_vk(); //strange name for a class but I didn't make it
    }

在start_vk中，我可以调用setVisible(true)，它可以工作，但是我很乐意稍后仅在需要时才实际调用它...现在我在某个地方调用setVisible(true)，只有JFrame出现没有组件...

In start_vk I could call setVisible(true) and it'd works but I would love to actually call this later only when I need it ... Now I call at some place the setVisible(true) and only the JFrame appears with no Components in it ...

我应该在单独的线程中调用它吗，因为start_vk的构造函数是使用SwingUtilities.invokeLater()完成的吗?或其他建议?

Should I call this in an apart Thread because the constructor for start_vk is done with SwingUtilities.invokeLater()? Or any other suggestion?

 public start_vk() {
 SwingUtilities.invokeLater(new Runnable() {
     public void run() {
        myConf = defaultConf.setDefault(myConf);
        myKeys = defaultConf.setKeyboard(myKeys);
        readConf();
        thisClass = new vk_gui();
        thisClass.setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE);
        thisClass.setVisible(true); // I've set it to true here but would like to set it to false to be able to call it later ...
     }
  });
  }

  public  void newText(){
      thisClass.newText();
  }

  public  boolean isVisible(){
      return thisClass.isVisible();
  }

  public  String getText(){
      return thisClass.getText();
  }

vk_gui中的代码:

The code in vk_gui:

public String getText(){
   if (super.isVisible())
       return null;
   return jTextArea.getText();
}

public void newText(){
   this.setVisible(true);
   this.setAlwaysOnTop(true);
   jTextArea.setText("");
}

这就是我当时的称呼:

keyboard.newText();
while(keyboard.getText()==null){} // I know it's busy waiting and it's not good and all that ...
text = keyboard.getText();

谢谢您的建议，麦克斯

推荐答案

1. setVisible(true);必须是public MainFrame() {

应该是什么this.keyboard = new start_vk(); ???，也许是要使用Swing Timer来调用某些内容并进行交易

what should be this.keyboard = new start_vk(); ???, maybe to use Swing Timer for invoke something and dealyed

调用setVisible(false)后，调用set Visible(true)时我的JFrame内容消失了

After calling setVisible(false) my JFrame contents are gone when calling set Visible(true)

如果要向已经可见的容器中添加或删除某些东西，则必须调用

if you add or remove something from/to already visible container you have to call

nearestContainer.revalidate();
// for JFrame/JDialog/JWindow and upto Java7 is there only validate();
nearestContainer.reapaint()

. 4.为了获得更好的帮助，请尽早发布 SSCCE

. 4. for better help sooner post an SSCCE

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