tablerenderdemo.java

通讯采集软件

package collector.gui.test;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.*;

public class TableRenderDemo
    extends JFrame {
  private boolean DEBUG = true;

  public TableRenderDemo() {
    super("TableRenderDemo");

    MyTableModel myModel = new MyTableModel();
    JTable table = new JTable(myModel);
    table.setPreferredScrollableViewportSize(new Dimension(500, 70));
    JScrollPane scrollPane = new JScrollPane(table);
    initColumnSizes(table, myModel);
    setUpSportColumn(table.getColumnModel().getColumn(2));
    getContentPane().add(scrollPane, BorderLayout.CENTER);
    addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
        System.exit(0);
      }
    });
  }

  private void initColumnSizes(JTable table, MyTableModel model) {
    TableColumn column = null;
    Component comp = null;
    int headerWidth = 0;
    int cellWidth = 0;
    Object[] longValues = model.longValues;

    for (int i = 0; i < 5; i++) {
      column = table.getColumnModel().getColumn(i);

      try {
        comp = column.getHeaderRenderer().
            getTableCellRendererComponent(
            null, column.getHeaderValue(),
            false, false, 0, 0);
        headerWidth = comp.getPreferredSize().width;
      }
      catch (NullPointerException e) {
        System.err.println("Null pointer exception!");
        System.err.println("  getHeaderRenderer returns null in 1.3.");
        System.err.println("  The replacement is getDefaultRenderer.");
      }

      comp = table.getDefaultRenderer(model.getColumnClass(i)).
          getTableCellRendererComponent(
          table, longValues[i],
          false, false, 0, i);
      cellWidth = comp.getPreferredSize().width;

      if (DEBUG) {
        System.out.println("Initializing width of column "
                           + i + ". "
                           + "headerWidth = " + headerWidth
                           + "; cellWidth = " + cellWidth);
      }
      column.setPreferredWidth(Math.max(headerWidth, cellWidth));
    }
  }

  public void setUpSportColumn(TableColumn sportColumn) {
    JComboBox comboBox = new JComboBox();
    comboBox.addItem("Snowboarding");
    comboBox.addItem("Rowing");
    comboBox.addItem("Chasing toddlers");
    comboBox.addItem("Speed reading");
    comboBox.addItem("Teaching high school");
    comboBox.addItem("None");
    sportColumn.setCellEditor(new DefaultCellEditor(comboBox));
    DefaultTableCellRenderer renderer =
        new DefaultTableCellRenderer();
    renderer.setToolTipText("Click for combo box");
    sportColumn.setCellRenderer(renderer);
    TableCellRenderer headerRenderer = sportColumn.getHeaderRenderer();
    if (headerRenderer instanceof DefaultTableCellRenderer) {
      ( (DefaultTableCellRenderer) headerRenderer).setToolTipText(
          "Click the sport to see a list of choices");
    }
  }

  class MyTableModel
      extends AbstractTableModel {
    final String[] columnNames = {
        "First Name",
        "Last Name",
        "Sport",
        "# of Years",
        "Vegetarian"};
    final Object[][] data = {
        {
        "Mary", "Campione",
        "Snowboarding", new Integer(5), new Boolean(false)}
        , {
        "Alison", "Huml",
        "Rowing", new Integer(3), new Boolean(true)}
        , {
        "Kathy", "Walrath",
        "Chasing toddlers", new Integer(2), new Boolean(false)}
        , {
        "Sharon", "Zakhour",
        "Speed reading", new Integer(20), new Boolean(true)}
        , {
        "Angela", "Lih",
        "Teaching high school", new Integer(4), new Boolean(false)}
    };
    public final Object[] longValues = {
        "Angela", "Andrews",
        "Teaching high school",
        new Integer(20), Boolean.TRUE};

    public int getColumnCount() {
      return columnNames.length;
    }

    public int getRowCount() {
      return data.length;
    }

    public String getColumnName(int col) {
      return columnNames[col];
    }

    public Object getValueAt(int row, int col) {
      return data[row][col];
    }

    public Class getColumnClass(int c) {
      return getValueAt(0, c).getClass();
    }

    public boolean isCellEditable(int row, int col) {
      if (col < 2) {
        return false;
      }
      else {
        return true;
      }
    }

    public void setValueAt(Object value, int row, int col) {
      if (DEBUG) {
        System.out.println("Setting value at " + row + "," + col
                           + " to " + value
                           + " (an instance of "
                           + value.getClass() + ")");
      }

      if (data[0][col] instanceof Integer
          && ! (value instanceof Integer)) {
        try {
          data[row][col] = new Integer(value.toString());
          fireTableCellUpdated(row, col);
        }
        catch (NumberFormatException e) {
          JOptionPane.showMessageDialog(TableRenderDemo.this,
                                        "The \"" + getColumnName(col)
                                        +
              "\" column accepts only integer values.");
        }
      }
      else {
        data[row][col] = value;
        fireTableCellUpdated(row, col);
      }

      if (DEBUG) {
        System.out.println("New value of data:");
        printDebugData();
      }
    }

    private void printDebugData() {
      int numRows = getRowCount();
      int numCols = getColumnCount();

      for (int i = 0; i < numRows; i++) {
        System.out.print("    row " + i + ":");
        for (int j = 0; j < numCols; j++) {
          System.out.print("  " + data[i][j]);
        }
        System.out.println();
      }
      System.out.println("--------------------------");
    }
  }

  public static void main(String[] args) {
    TableRenderDemo frame = new TableRenderDemo();
    frame.pack();
    frame.setVisible(true);
  }
}