java - JTable右键复制/粘贴菜单一键复制单元格数据

Question

我创建了我的 JPopupMenu .它出现在我的 JTable 上当我右键单击一个单元格时。但是，我无法复制单元格中的数据，除非我先双击然后突出显示数据，然后右键单击当前单元格以外的任何地方以显示我的弹出菜单和复制选项。

我想复制单元格中的数据，而不必双击单元格并进入单元格编辑模式，然后我需要在其中选择数据。

我该怎么做？

popup = new JPopupMenu();
popup.setName("popupMenu");
menuItemCopy = new JMenuItem(new DefaultEditorKit.CopyAction());
menuItemCopy.setText("Copy");
menuItemCopy.setName("copy");       
popup.add(menuItemCopy);
popup.addSeparator();
menuItemPaste = new JMenuItem(new DefaultEditorKit.PasteAction());
menuItemPaste.setText("Paste");
menuItemPaste.setName("paste");
popup.add(menuItemPaste);

这是我的 MouseListener 中的代码对于我的 JTable , 在 mouseReleased()和 mousePressed() .

if(e.isPopupTrigger())
{
    JTable source = (JTable)e.getSource();
    int row = source.rowAtPoint( e.getPoint() );
    int column = source.columnAtPoint( e.getPoint() );

    gridView.popup.show(e.getComponent(), e.getX(), e.getY());              
}

Answer 1

两件事...

1. 我不确定您如何期望 DefaultEditorKit.CopyAction 和 DefaultEditorKit.PasteAction 与 JTable 一起工作，这些假设与 JTextComponents...
一起使用
2. JTable 只会在按下左键(或键盘导航更改)时突出显示行，默认情况下单击鼠标右键不会执行此操作。

现在，我想使用 JTable 的组件弹出支持，但这似乎会在检测到弹出触发器时消耗所有鼠标事件，这使得(几乎)无法突出显示单击鼠标右键行/列。

相反，我最终在我的 MouseListener 中添加了一个 highlight 方法，该方法突出显示有问题的行/列，然后触发弹出窗口。

我这样做的原因是，与复制和粘贴相关的 Action 除了表格之外没有任何概念，所以他们不知道点击了什么行/列上。

这使这些操作可以专注于单独担心选择。

内容通过自定义可传输对象直接复制到系统剪贴板，保持单元格的原始类型，这意味着您不需要在粘贴对象时重建对象。

import java.awt.Component;
import java.awt.EventQueue;
import java.awt.Point;
import java.awt.Toolkit;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.FlavorEvent;
import java.awt.datatransfer.FlavorListener;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.event.ActionEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.io.File;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.AbstractAction;
import static javax.swing.Action.NAME;
import javax.swing.JFrame;
import javax.swing.JPopupMenu;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;

public class TestTable100 {

    public static void main(String[] args) {
        new TestTable100();
    }

    public TestTable100() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                    ex.printStackTrace();
                }

                DefaultTableModel model = new DefaultTableModel();
                model.addColumn("Type");
                model.addColumn("Column");
                for (File file : new File(System.getProperty("user.home")).listFiles()) {
                    model.addRow(new Object[]{file, file});
                }

                JTable table = new JTable(model);
                table.getColumnModel().getColumn(0).setCellRenderer(new FirstCellRenderer());

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.add(new JScrollPane(table));
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);

                final JPopupMenu pm = new JPopupMenu();
                pm.add(new CopyAction(table));
                pm.add(new PasteAction(table));

                table.addMouseListener(new MouseAdapter() {

                    @Override
                    public void mouseClicked(MouseEvent e) {
                        if (e.isPopupTrigger()) {
                            highlightRow(e);
                            doPopup(e);
                        }
                    }

                    @Override
                    public void mouseReleased(MouseEvent e) {
                        if (e.isPopupTrigger()) {
                            highlightRow(e);
                            doPopup(e);
                        }
                    }

                    protected void doPopup(MouseEvent e) {
                        pm.show(e.getComponent(), e.getX(), e.getY());
                    }

                    protected void highlightRow(MouseEvent e) {
                        JTable table = (JTable) e.getSource();
                        Point point = e.getPoint();
                        int row = table.rowAtPoint(point);
                        int col = table.columnAtPoint(point);

                        table.setRowSelectionInterval(row, row);
                        table.setColumnSelectionInterval(col, col);
                    }

                });
            }
        });
    }

    public class FirstCellRenderer extends DefaultTableCellRenderer {

        @Override
        public Component getTableCellRendererComponent(JTable table, Object value,
                        boolean isSelected, boolean hasFocus, int row, int column) {

            File f = (File) value;

            super.getTableCellRendererComponent(table,
                            value, isSelected, hasFocus, row, column);
            String prefix = f.isDirectory() ? "DIR" : "FILE";
            setText(prefix);

            return this;
        }
    }

    public class CopyAction extends AbstractAction {

        private JTable table;

        public CopyAction(JTable table) {
            this.table = table;
            putValue(NAME, "Copy");
        }

        @Override
        public void actionPerformed(ActionEvent e) {
            int row = table.getSelectedRow();
            int col = table.getSelectedColumn();

            Clipboard cb = Toolkit.getDefaultToolkit().getSystemClipboard();
            cb.setContents(new CellTransferable(table.getValueAt(row, col)), null);
        }

    }

    public class PasteAction extends AbstractAction {

        private JTable table;

        public PasteAction(JTable table) {
            this.table = table;
            putValue(NAME, "Paste");
            final Clipboard cb = Toolkit.getDefaultToolkit().getSystemClipboard();
            cb.addFlavorListener(new FlavorListener() {
                @Override
                public void flavorsChanged(FlavorEvent e) {
                    setEnabled(cb.isDataFlavorAvailable(CellTransferable.CELL_DATA_FLAVOR));
                }
            });
            setEnabled(cb.isDataFlavorAvailable(CellTransferable.CELL_DATA_FLAVOR));
        }

        @Override
        public void actionPerformed(ActionEvent e) {
            int row = table.getSelectedRow();
            int col = table.getSelectedColumn();

            Clipboard cb = Toolkit.getDefaultToolkit().getSystemClipboard();
            if (cb.isDataFlavorAvailable(CellTransferable.CELL_DATA_FLAVOR)) {
                try {
                    Object value = cb.getData(CellTransferable.CELL_DATA_FLAVOR);
                    table.setValueAt(value, row, col);
                } catch (UnsupportedFlavorException | IOException ex) {
                    ex.printStackTrace();
                }
            }
        }

    }

    public static class CellTransferable implements Transferable {

        public static final DataFlavor CELL_DATA_FLAVOR = new DataFlavor(Object.class, "application/x-cell-value");

        private Object cellValue;

        public CellTransferable(Object cellValue) {
            this.cellValue = cellValue;
        }

        @Override
        public DataFlavor[] getTransferDataFlavors() {
            return new DataFlavor[]{CELL_DATA_FLAVOR};
        }

        @Override
        public boolean isDataFlavorSupported(DataFlavor flavor) {
            return CELL_DATA_FLAVOR.equals(flavor);
        }

        @Override
        public Object getTransferData(DataFlavor flavor) throws UnsupportedFlavorException, IOException {
            if (!isDataFlavorSupported(flavor)) {
                throw new UnsupportedFlavorException(flavor);
            }
            return cellValue;
        }

    }
}