java在主应用程序JFrame最小化时最小化辅助JFrame

Question

我正在处理的应用程序包含一个主JFrame，用户最终可能会从中打开另一个补充框架。我正在尝试实现这样一种应用程序行为，即主框架一最小化，辅助框架就最小化（图标化）

我正在考虑重写主框架的setExtendedState方法，以捕获它最小化的时刻，然后从那里触发属性更改事件，以便辅助框架可以对其进行操作

然而，我发现，不幸的是，被重写的setExtendedState从未被调用

我将非常感谢任何实现所需行为的想法。下面是我用来测试的代码

import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;

import javax.swing.AbstractAction;
import javax.swing.JButton;
import javax.swing.JFrame;


public class IconifySupplementaryFrameTest {

    public static void main(String[] args) {
        (new MainFrame()).setVisible(true);
    }

}

class MainFrame extends JFrame {
    public static final String EXTENDED_STATE_KEY = "extendedState";

    MainFrame() {
        super("Iconify test - main window");

        setLayout(new FlowLayout(FlowLayout.LEADING));

        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setSize(400, 400);
        setLocationByPlatform(true);

        add(new JButton(new AbstractAction("Show supplementary frame") {
            @Override
            public void actionPerformed(ActionEvent e) {
                SupplementaryFrame.doShow(MainFrame.this);
            }
        }));
    }

    @Override
    public synchronized void setExtendedState(int state) {
// This overridden method is never called ???       
        int oldState = getExtendedState();
        super.setExtendedState(state);
        firePropertyChange(EXTENDED_STATE_KEY, oldState, state);
    }
}


class SupplementaryFrame extends JFrame implements PropertyChangeListener {
    private static SupplementaryFrame instance;

    private SupplementaryFrame(final JFrame parentFrame) {
        super("Iconify test - supplementary window");

        setSize(300, 300);
        setLocationRelativeTo(parentFrame);

        parentFrame.addPropertyChangeListener(
                MainFrame.EXTENDED_STATE_KEY, this);

        addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                instance = null;
                parentFrame.removePropertyChangeListener(
                        MainFrame.EXTENDED_STATE_KEY,
                        SupplementaryFrame.this);
                SupplementaryFrame.this.dispose();
            }
        });
    }


    static void doShow(JFrame parentFrame) {
        if(instance == null) {
            instance = new SupplementaryFrame(parentFrame);
            instance.setVisible(true);
        }
        else {
            // omitted _ugly_ code to bring this window (instance) to front 
        }

    }


    @Override
    public void propertyChange(PropertyChangeEvent evt) {
        int state = this.getExtendedState();
        int parentState = ((Integer)evt.getNewValue()).intValue();

        if((parentState & ICONIFIED) == ICONIFIED) 
            this.setExtendedState(state | ICONIFIED);
    }
}

Answer 1

The application I'm working on contains a main JFrame, from which users might eventually open another supplementary frame

应用程序通常设计为使用单个JFrame。补充窗口是使用JDialog创建的。创建对话框时，请确保将框架指定为对话框的所有者。现在，当您对帧进行图标化/非图标化时，对话框将自动同步进行图标化

Answer 2

只需将WindowsStateListener添加到大型机，即可使您的代码与属性更改listener一起工作：

addWindowStateListener(new WindowStateListener() {

        @Override
        public void windowStateChanged(WindowEvent e) {
                firePropertyChange(EXTENDED_STATE_KEY, e.getOldState(), e.getNewState());
        }
    });