java - 更改 JButton 颜色并同时移动 JTextArea 插入符号

Question

我正在编写一个程序，其中有一个键盘和一个 JTextArea。按下按钮后，按钮的颜色以及插入符号的位置都会发生变化。我使用了按键绑定(bind)。现在，如果我首先更改颜色然后移动插入符号，则只有插入符号移动，但颜色不会改变，反之亦然。这是我的代码示例:(我有很多面板来组织其余按钮...)

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;

import javax.swing.AbstractAction;
import javax.swing.ActionMap;
import javax.swing.ButtonGroup;
import javax.swing.InputMap;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.KeyStroke;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.border.EmptyBorder;

public class KeyboardTest extends JFrame {

public static final JTextArea textToType = new JTextArea("jjj jjj jjj jjj kkk kkk kkk kkk jjj kkk jjj kkk jjj kkk jkj jkj jkj jkj kjk kjk kjk \r\nkjk jjj jjj jjj kkk kkk kkk jk jk jk kj kj kj jj kk jk kj kj jk jj jk kk kj j j j j k \r\nk k k j k k j j k k j jkj jjk kjj kkj jkk kkk jjj kjk");
public static final int caretPosition = 0;

public static void main(String[] args) {
    new KeyboardTest();
}

public KeyboardTest() {
    EventQueue.invokeLater(new Runnable() {
        @Override
        public void run() {
            try {
        UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
            } catch (Exception ex) {
                try {
                    UIManager.setLookAndFeel(UIManager
                            .getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException
                        | IllegalAccessException
                        | UnsupportedLookAndFeelException e) {
                    e.printStackTrace();
                }
            }
            JFrame frame = new JFrame("Testing");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setLayout(new BorderLayout());
            frame.add(new TestPane());
            frame.setLocationRelativeTo(null);
            frame.setVisible(true);
            frame.setBounds(100, 100, 650, 390);
        }
    });

}

public class TestPane extends JPanel {

    public TestPane() {
        JPanel contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        add(contentPane);
        GridBagLayout gbl_contentPane = new GridBagLayout();
        gbl_contentPane.columnWidths = new int[] { 614, 0 };
        gbl_contentPane.rowHeights = new int[] { 31, 14, 51, 181, 25, 0 };
        gbl_contentPane.columnWeights = new double[] { 0.0,
                Double.MIN_VALUE };
        gbl_contentPane.rowWeights = new double[] { 0.0, 0.0, 0.0, 0.0,
                0.0, Double.MIN_VALUE };
        contentPane.setLayout(gbl_contentPane);

        JLabel title = new JLabel(
                "Our first touch typing lesson introduces 2 home row keys for the right hand: j k");
        GridBagConstraints gbc_title = new GridBagConstraints();
        gbc_title.fill = GridBagConstraints.BOTH;
        gbc_title.insets = new Insets(0, 0, 5, 0);
        gbc_title.gridx = 0;
        gbc_title.gridy = 1;
        contentPane.add(title, gbc_title);

        textToType.setEditable(false);
        textToType.setFont(new Font("Lucida Console", Font.PLAIN, 12));
        textToType.setBackground(new Color(255, 250, 205));
        textToType
                .setText("jjj jjj jjj jjj kkk kkk kkk kkk jjj kkk jjj kkk jjj kkk jkj jkj jkj jkj kjk kjk kjk \r\nkjk jjj jjj jjj kkk kkk kkk jk jk jk kj kj kj jj kk jk kj kj jk jj jk kk kj j j j j k \r\nk k k j k k j j k k j jkj jjk kjj kkj jkk kkk jjj kjk");
        textToType.getCaret().setVisible(true);
        textToType.setCaretPosition(caretPosition);
        textToType.setFocusable(false);
        GridBagConstraints gbc_textToType = new GridBagConstraints();
        gbc_textToType.fill = GridBagConstraints.BOTH;
        gbc_textToType.insets = new Insets(0, 0, 5, 0);
        gbc_textToType.gridx = 0;
        gbc_textToType.gridy = 2;
        contentPane.add(textToType, gbc_textToType);

        JPanel keyboardPanel = new JPanel();
        GridBagConstraints gbc_keyboardPanel = new GridBagConstraints();
        gbc_keyboardPanel.fill = GridBagConstraints.BOTH;
        gbc_keyboardPanel.insets = new Insets(0, 0, 5, 0);
        gbc_keyboardPanel.gridx = 0;
        gbc_keyboardPanel.gridy = 3;
        contentPane.add(keyboardPanel, gbc_keyboardPanel);
        keyboardPanel.setLayout(new GridLayout(5, 0, 0, 0));

        JPanel kPanel1 = new JPanel();
        keyboardPanel.add(kPanel1);
        kPanel1.setLayout(null);

        JPanel buttonspanel1 = new JPanel();
        buttonspanel1.setBounds(0, 0, 523, 36);
        kPanel1.add(buttonspanel1);
        buttonspanel1.setLayout(new GridLayout(0, 13, 0, 5));

        JButton one = new JButton("1");
        one.setFocusable(false);
        buttonspanel1.add(one);

        addKeyBindingGreen(one, "1", KeyEvent.VK_1);

        addKeyBinding(one, "1", KeyEvent.VK_1);
}
//Key Binding to change the button to green...

        protected void addKeyBindingGreen(JButton btn, String name,
            int virtualKey) {
        ActionMap am = getActionMap();
        InputMap im = getInputMap(WHEN_IN_FOCUSED_WINDOW);

        im.put(KeyStroke.getKeyStroke(virtualKey, 0, false), name
                + ".pressed");
        im.put(KeyStroke.getKeyStroke(virtualKey, 0, true), name
                + ".released");

        am.put(name + ".pressed", new KeyActionGreen(btn, true));
        am.put(name + ".released", new KeyActionGreen(btn, false));
    }

 //Key binding to move the caret

        protected void addKeyBinding(JButton btn, String name,
            int virtualKey) {
        ActionMap am = getActionMap();
        InputMap im = getInputMap(WHEN_IN_FOCUSED_WINDOW);

        im.put(KeyStroke.getKeyStroke(virtualKey, 0, false), name
                + ".pressed");
        im.put(KeyStroke.getKeyStroke(virtualKey, 0, true), name
                + ".released");

        am.put(name + ".pressed", new KeyAction(btn, true, caretPosition));
        am.put(name + ".released", new KeyAction(btn, false, caretPosition ));
    }
}
public class KeyAction extends AbstractAction {

    private JButton btn;
    private boolean cur;
    private int caretPosition;

    public KeyAction(JButton btn, boolean cur, int caretPosition) {
        this.btn = btn;
        this.cur = cur;
        this.caretPosition = caretPosition;
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        if (cur) {
            btn.getModel().setPressed(true);
            textToType.setCaretPosition(caretPosition++);
        } else {
            btn.getModel().setPressed(false);
        }
    }

}
public class KeyActionGreen extends AbstractAction {

    private JButton btn;
    private boolean highlight;

    public KeyActionGreen(JButton btn, boolean highlight) {
        this.btn = btn;
        this.highlight = highlight;
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        if (highlight) {
            btn.getModel().setPressed(true);
            btn.setBackground(Color.GREEN);
            btn.setOpaque(true);
        } else {
            btn.getModel().setPressed(false);
            btn.setBackground(null);
            btn.setOpaque(false);
        }
    }

    }
}

Answer 1

您正在将 Action 添加到 的 name + ".pressed" 和 name + ".released" 键ActionMap，都在您的 addKeyBinding 和 addKeyBindingGreen 方法中。

AcationMap 是一个Map。 Map 的行为是每个键只能包含一个值。如果您尝试将两个值放入同一个键，则您放置的第一个值将被第二个值推出，在您的情况下，该值是您第二个添加的 Action 。

唯一的选择是将所需的代码合并到一个Action