MainPanel.java

// -*- mode:java; encoding:utf-8 -*-
// vim:set fileencoding=utf-8:
// @homepage@

package example;

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.MouseEvent;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.format.DateTimeFormatter;
import java.time.temporal.TemporalAccessor;
import java.util.EventObject;
import java.util.Objects;
import javax.swing.*;
import javax.swing.plaf.basic.BasicComboBoxUI;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellEditor;
import javax.swing.table.TableColumn;
import javax.swing.table.TableModel;

public final class MainPanel extends JPanel {
  private MainPanel() {
    super(new BorderLayout());
    ZoneId zid = ZoneId.systemDefault();

    String[] columnNames = {"LocalDateTime", "String", "Boolean"};
    Object[][] data = {
        {LocalDateTime.now(zid), "aaa", true}, {LocalDateTime.now(zid), "bbb", false},
        {LocalDateTime.now(zid), "CCC", true}, {LocalDateTime.now(zid), "DDD", false}
    };
    TableModel model = new DefaultTableModel(data, columnNames) {
      @Override public Class<?> getColumnClass(int column) {
        return getValueAt(0, column).getClass();
      }
    };
    JTable table = new JTable(model);
    table.setAutoCreateRowSorter(true);
    TableColumn col = table.getColumnModel().getColumn(0);
    col.setCellRenderer(new LocalDateTimeTableCellRenderer());
    col.setCellEditor(new LocalDateTimeTableCellEditor());

    add(new JScrollPane(table));
    setPreferredSize(new Dimension(320, 240));
  }

  public static void main(String[] args) {
    EventQueue.invokeLater(MainPanel::createAndShowGui);
  }

  private static void createAndShowGui() {
    try {
      UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
    } catch (UnsupportedLookAndFeelException ignored) {
      Toolkit.getDefaultToolkit().beep();
    } catch (ClassNotFoundException | InstantiationException | IllegalAccessException ex) {
      ex.printStackTrace();
      return;
    }
    JFrame frame = new JFrame("@title@");
    frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    frame.getContentPane().add(new MainPanel());
    frame.pack();
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
  }
}

class LocalDateTimeTableCellRenderer extends DefaultTableCellRenderer {
  private static final String PATTERN = "yyyy/MM/dd";

  @Override public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
    Component c = super.getTableCellRendererComponent(
        table, value, isSelected, hasFocus, row, column);
    if (c instanceof JLabel && value instanceof TemporalAccessor) {
      ((JLabel) c).setText(DateTimeFormatter.ofPattern(PATTERN).format((TemporalAccessor) value));
    }
    return c;
  }
}

class ZeroSizeButtonUI extends BasicComboBoxUI {
  @Override protected JButton createArrowButton() {
    return new JButton() {
      @Override public Dimension getPreferredSize() {
        return new Dimension();
      }

      @Override public boolean isVisible() {
        return false;
      }

      @Override public void updateUI() {
        super.updateUI();
        setBorder(BorderFactory.createEmptyBorder());
        // setVisible(false);
      }
    };
  }
}

class LocalDateTimeTableCellEditor extends AbstractCellEditor implements TableCellEditor {
  private final JComboBox<LocalDateTime> comboBox = new JComboBox<LocalDateTime>() {
    @Override public void updateUI() {
      super.updateUI();
      UIManager.put("ComboBox.squareButton", Boolean.FALSE);
      putClientProperty("JComboBox.isTableCellEditor", Boolean.TRUE);
      setBorder(BorderFactory.createEmptyBorder(1, 1, 1, 1));
      setOpaque(false);
      setRenderer(new LocalDateTimeCellRenderer());
      setUI(new ZeroSizeButtonUI());
    }
  };
  private LocalDateTime selectedDate;

  @Override public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
    if (value instanceof LocalDateTime) {
      comboBox.setModel(new DefaultComboBoxModel<LocalDateTime>() {
        @Override public LocalDateTime getElementAt(int index) {
          // if (index >= 0 && index < getSize()) {
          return LocalDateTime.now(ZoneId.systemDefault()).plusDays(index);
        }

        @Override public int getSize() {
          return 7; // in a week
        }

        @Override public Object getSelectedItem() {
          return selectedDate;
        }

        @Override public void setSelectedItem(Object anItem) {
          selectedDate = (LocalDateTime) anItem;
        }
      });
      selectedDate = (LocalDateTime) value;
    }
    comboBox.setBorder(UIManager.getBorder("Table.focusCellHighlightBorder"));
    return comboBox;
  }

  @Override public Object getCellEditorValue() {
    return comboBox.getSelectedItem();
  }

  @Override public boolean shouldSelectCell(EventObject e) {
    // if (e instanceof MouseEvent) {
    //   return notMouseDrag((MouseEvent) e);
    // }
    // return true;
    return !(e instanceof MouseEvent) || ((MouseEvent) e).getID() != MouseEvent.MOUSE_DRAGGED;
  }

  @Override public boolean stopCellEditing() {
    if (comboBox.isEditable()) {
      // Commit edited value.
      comboBox.actionPerformed(new ActionEvent(this, 0, ""));
    }
    return super.stopCellEditing();
  }

  // @Override public boolean isCellEditable(EventObject e) {
  //   return true;
  // }
}

class LocalDateTimeCellRenderer implements ListCellRenderer<LocalDateTime> {
  private final DefaultListCellRenderer renderer = new DefaultListCellRenderer();
  private static final String PATTERN = "yyyy/MM/dd";

  @Override public Component getListCellRendererComponent(JList<? extends LocalDateTime> list, LocalDateTime value, int index, boolean isSelected, boolean cellHasFocus) {
    Component c = renderer.getListCellRendererComponent(
        list, value, index, isSelected, cellHasFocus);
    if (isSelected) {
      c.setBackground(list.getSelectionBackground());
      c.setForeground(list.getSelectionForeground());
    } else {
      c.setBackground(list.getBackground());
      c.setForeground(list.getForeground());
    }
    if (c instanceof JLabel && Objects.nonNull(value)) {
      JLabel l = (JLabel) c;
      l.setOpaque(true);
      l.setText(DateTimeFormatter.ofPattern(PATTERN).format(value));
    }
    return c;
  }
}