在swing应用程序中保留键盘布局？ [英] Preserving keyboard layout in swing app?

问题描述

我有一个Java Swing应用程序，它会生成带有文本控件的子对话框。问题是，当您在子对话框中更改键盘布局时，它会在对话框关闭后立即更改。

I have a Java Swing application wich spawns child dialogs with text controls. And the problem is that when you change keyboard layout in child dialog, it changes back right after the dialog is closed.

我需要的是保持后的keboard布局切换是在主框架还是子框架中切换。

What I need is the keboard layout to stay after being switched whether it was switched in the main frame or in a child frame.

这是一个说明问题的SSCCE：

Here is a SSCCE that illustrates the problem:

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class InheritInputContext {

    public static void main(String[] arg) {
        final MainFrame mainFrame = new MainFrame();
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                mainFrame.setPreferredSize(new Dimension(300, 400));
                mainFrame.pack();
                mainFrame.setLocationRelativeTo(null);
                mainFrame.setVisible(true);
            }
        });

    }
}


class MainFrame extends JFrame {

    MainFrame() {
        setLayout(new BorderLayout());
        JTextArea textArea = new JTextArea();
        add(textArea, BorderLayout.CENTER);

        JButton dialogBtn = new JButton("Dialog");
        add(dialogBtn, BorderLayout.SOUTH);
        dialogBtn.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                ChildDialog cd = new ChildDialog(MainFrame.this);
                cd.setPreferredSize(new Dimension(200, 200));
                cd.setLocationRelativeTo(MainFrame.this);
                cd.pack();
                cd.setVisible(true);
            }
        });
    }
}


class ChildDialog extends JDialog {

    ChildDialog(Window w) {
        super(w);
        JTextArea textArea = new JTextArea();
        getContentPane().add(textArea);
    }
}

推荐答案

好的，我刚刚解决了这个解决方案：

Ok, I just settled with this solution:

在main（）方法中添加了一个java工具包的监听器，如下所示：

Added a listener to java toolkit in main() method like this:

AWTEventListener awtWindowListener = new AWTEventListener() {
    @Override
    public void eventDispatched(AWTEvent event) {
        if (event instanceof WindowEvent) {
            if (WindowEvent.WINDOW_CLOSED == event.getID()
                    || WindowEvent.WINDOW_CLOSING == event.getID()) {
                Window child = ((WindowEvent) event).getWindow();
                Window parent = SwingUtilities.getWindowAncestor(child);
                if (parent == null) return;
                InputContext childIC = child.getInputContext();
                parent.getInputContext().selectInputMethod(childIC.getLocale());
            }
        }

    }
};

Toolkit.getDefaultToolkit().addAWTEventListener(awtWindowListener, AWTEvent.WINDOW_EVENT_MASK);

它适用于使用父窗口生成的所有子对话框作为构造函数参数。在关闭事件中，来自子对话框的InputContext的Locale被放入其父窗口的InputContext中。

It works on all child dialogs generated with parent window as constructor parameter. On close event Locale from InputContext of child dialog is put into InputContext of it's parent window.

可能有更好的方法。

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