java 通过 setVisible 隐藏/显示的 JFrame 的窗口事件？
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Window events for JFrames that are hidden/shown via setVisible?
提问by schweerelos
Which kind of listener do I have to add to a JFrameto detect when it is being hidden or shown via setVisible?
我必须添加哪种侦听器JFrame来检测它何时被隐藏或通过 显示setVisible？
I tried using a WindowListenerand the windowOpenedand windowClosedmethods, but they only work for the first timethat a window is opened (windowOpened) or, respectively, when the window is closed using the dispose method (windowClosed). That is not enough for me. I want to be notified every time the window is made visible and invisible on the screen using setVisible.
我尝试使用 aWindowListener和windowOpenedandwindowClosed方法，但它们仅在第一次打开窗口时有效 ( windowOpened)，或者分别在使用 dispose 方法关闭窗口时有效 ( windowClosed)。这对我来说还不够。我希望每次使用setVisible.
Is there a standard Swing way to achieve this, or do I need to make my own (by, say, overriding the setVisiblemethod)?
是否有标准的 Swing 方法来实现这一点，还是我需要自己制作（例如，覆盖该setVisible方法）？
回答by James
Try a java.awt.event.ComponentListener. You can add one using this code (where window is the name of the JFrame) :
尝试一个java.awt.event.ComponentListener. 您可以使用此代码添加一个（其中 window 是 的名称JFrame）：
window.addComponentListener(new ComponentAdapter() {
public void componentHidden(ComponentEvent e) {
/* code run when component hidden*/
}
public void componentShown(ComponentEvent e) {
/* code run when component shown */
}
});
回答by Desphilboy
1- Create a class that implements ComponentListener Interface, Like the following example:
1- 创建一个实现 ComponentListener 接口的类，如下例所示：
//---------------------
import java.awt.event.ComponentEvent;
import java.awt.event.ComponentListener;
public class winlistenner implements ComponentListener {
public void componentHidden(ComponentEvent arg0) {
// TODO Auto-generated method stub
System.out.print("Hided\r\n");
}
public void componentMoved(ComponentEvent arg0) {
// TODO Auto-generated method stub
System.out.print("Moved\r\n");
}
public void componentResized(ComponentEvent arg0) {
// TODO Auto-generated method stub
System.out.print("Resized\r\n");
}
public void componentShown(ComponentEvent arg0) {
// TODO Auto-generated method stub
System.out.print("Shown\r\n");
}
}
//------------------------------------------------------------------------
2- Now create a getter for your JFrame like this:
2- 现在为您的 JFrame 创建一个 getter，如下所示：
public class JMain {
private JFrame frmNetworkshareMoon;
private JTextField textField;
private JTextField textField_1;
private JTextField textField_2;
public JFrame getFrmNetworkshareMoon() {
return frmNetworkshareMoon;
}
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
JMain window = new JMain();
winlistenner listenner= new winlistenner();
window.getFrmNetworkshareMoon().addComponentListener(listenner);
window.frmNetworkshareMoon.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
//......
// the rest of your class code:
//...
}
3- being your main like the above example, you will set JFrame listener the listener you created, and then run the program, you will see messages coming from the listener:
3- 像上面的例子一样，你将设置 JFrame 侦听器作为你创建的侦听器，然后运行程序，你将看到来自侦听器的消息：
Moved
Resized
Resized
Moved
Shown
Moved
Moved
