Question

我的要求是，如果用户按 Ctrl + C 。组合框中的文本将被自动复制（不突出显示，将复制整个单词）。因此，如果我转到另一个组合框，则可以将其粘贴。我是Java新手，不知道如何使用它，

这是方案要求的说明：

光标在第一个组合框中，指示这是当前可编辑的。
用户按 Ctrl + C
用户选择第三个组合框（光标位于第三个组合框处，指示这是当前组合框）可修改），然后按 Ctrl + V

到目前为止，我只有这个

JTextComponent editor = (JTextComponent) combo.getEditor().getEditorComponent();
    Action test = new AbstractAction() {
        public void actionPerformed(ActionEvent e) {
            //do function here
        }
    };

    editor.getInputMap().put(KeyStroke.getKeyStroke(KeyEvent.VK_C, InputEvent.CTRL_MASK), "test");
    editor.getActionMap().put("test", test);

Answer 1

我做了类似的事情：

我使用了JComboBox本身的InputMap和ActionMap，并使用了WHEN_ANCESTOR_OF_FOCUSED_COMPONENT的InputMap条件。

import java.awt.Toolkit;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.StringSelection;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.swing.*;

@SuppressWarnings("serial")
public class ComboCopy extends JPanel {
    private static final int COMBO_COUNT = 3;
    private static final String[] DATA = {"Monday", "Tuesday", "Wednesday",
            "Thursday", "Friday"};
    private List<JComboBox<String>> combos = new ArrayList<>();

    public ComboCopy() {
        for (int i = 0; i < COMBO_COUNT; i++) {
            JComboBox<String> combo = new JComboBox<>(DATA);
            setBindings(combo);
            combos.add(combo);
            add(combo);
        }
    }

    private void setBindings(final JComboBox<String> combo) {
        int condition = WHEN_ANCESTOR_OF_FOCUSED_COMPONENT;
        InputMap inputMap = combo.getInputMap(condition);
        ActionMap actionMap = combo.getActionMap();

        KeyStroke ctrlC = KeyStroke.getKeyStroke(KeyEvent.VK_C, KeyEvent.CTRL_DOWN_MASK);
        KeyStroke ctrlV = KeyStroke.getKeyStroke(KeyEvent.VK_V, KeyEvent.CTRL_DOWN_MASK);

        inputMap.put(ctrlC, ctrlC.toString());
        actionMap.put(ctrlC.toString(), new AbstractAction() {

            @Override
            public void actionPerformed(ActionEvent e) {
                String text = (String) combo.getSelectedItem();
                if (text != null) {
                    Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
                    Transferable contents = new StringSelection(text);
                    clipboard.setContents(contents, null);
                }
            }
        });
        inputMap.put(ctrlV, ctrlV.toString());
        actionMap.put(ctrlV.toString(), new AbstractAction() {

            @Override
            public void actionPerformed(ActionEvent e) {
                Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
                Transferable contents = clipboard.getContents(null);
                if (contents != null && contents.isDataFlavorSupported(DataFlavor.stringFlavor)) {
                    String text;
                    try {
                        text = (String) contents.getTransferData(DataFlavor.stringFlavor);
                        combo.setSelectedItem(text);
                    } catch (UnsupportedFlavorException | IOException e1) {
                        e1.printStackTrace();
                    }
                }
            }
        });

    }

    private static void createAndShowGui() {
        ComboCopy mainPanel = new ComboCopy();

        JFrame frame = new JFrame("ComboCopy");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().add(mainPanel);
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> createAndShowGui());
    }
}

Answer 2

为了可能遇到这个奇怪要求的其他人的利益。

JTextComponent editor = (JTextComponent) combo.getEditor().getEditorComponent();

    Action copyAllText = new AbstractAction() {
        public void actionPerformed(ActionEvent e) {
            String item = combo.getEditor().getItem().toString().trim();
            StringSelection stringSelection = new StringSelection(item);
            Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
            clipboard.setContents(stringSelection, null);
        }
    };

    editor.getInputMap().put(KeyStroke.getKeyStroke(KeyEvent.VK_C, InputEvent.CTRL_MASK), "copyAllText");
    editor.getActionMap().put("copyAllText", copyAllText);

在组合框Java中复制文本

2 个答案: