Question

我需要在Jtable中显示一个单元数据(20.2,true)，其中20.2是float，而true是格式为(20.2,[JCheckBox])的布尔值。是否可以以这种方式呈现2个不同的对象？

Answer 1

是的，是的。但我认为你需要一个复合渲染器，这意味着你必须创建自己的CellRenderer来实现TableCellRenderer或扩展现有的DefaultTableCellRenderer。至少只要您想在表格中显示这些值，这应该适合您。

您的化合物将包含一个用于显示浮动的标签和一个用于显示布尔值的复选框。

编辑：好的，这是一个小例子：

/**
 * Example for CompoundRenderer
 * 
 * @author ymene
 */
public class CompoundRendererExample extends JPanel
{

  public static void main( String[] args )
  {
    JFrame frame = new JFrame( "Example for rendering JTable - values with CompoundRenderer" );
    frame.setDefaultCloseOperation( WindowConstants.EXIT_ON_CLOSE );
    frame.add( new CompundRendererExample() );
    frame.pack();
    frame.setVisible( true );
  }

  public CompoundRendererExample()
  {
    JScrollPane scrollPane = new JScrollPane();
    JXTable table;

    table = new JXTable( new TableModel() );
    table.setFillsViewportHeight( true );

    for ( int i = 0; i < table.getModel().getColumnCount(); i++ )
      table.getColumn( i ).setPreferredWidth( 200 );

    scrollPane.setViewportView( table );
    add( scrollPane );

    //Declaring compound-renderer
    table.setDefaultRenderer( FloatBool.class, new FloatBoolRenderer() );
  }
}


class TableModel extends AbstractTableModel
{
  private String[]   columnNames = { "Float-Boolean" };
  private Object[][] data        = { { new FloatBool( 2.2f, true ) }, { new FloatBool( 3.2f, false ) } };

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

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

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

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

  @Override
  public Class getColumnClass( int c )
  {
    if ( getValueAt( 0, c ) == null )
      return Object.class;
    return getValueAt( 0, c ).getClass();
  }

  @Override
  public boolean isCellEditable( int row, int col )
  {
    return true;
  }

  @Override
  public void setValueAt( Object value, int row, int col )
  {
    data[ row ][ col ] = value;
    fireTableCellUpdated( row, col );
  }
}


class FloatBoolRenderer extends DefaultTableCellRenderer
{
  JLabel    floatPartLabel;
  JCheckBox booleanPartCheckBox;
  JPanel    container;

  public FloatBoolRenderer()
  {
    floatPartLabel = new JLabel();
    booleanPartCheckBox = new JCheckBox();
    container = new JPanel();

    container.setLayout( new BorderLayout() );
    container.add( floatPartLabel, BorderLayout.CENTER );
    container.add( booleanPartCheckBox, BorderLayout.EAST );
    container.setVisible( true );
  }

  @Override
  public Component getTableCellRendererComponent( JTable table, Object value, boolean isSelected,
                                                  boolean hasFocus, int row, int column )
  {
    if ( value != null )
    {
      super.getTableCellRendererComponent( table, value, isSelected, hasFocus, row, column );

      if ( value instanceof FloatBool )
      {
        FloatBool floatboolean = (FloatBool) value;
        booleanPartCheckBox.setSelected( floatboolean.getBooleanValue() );
        floatPartLabel.setText( "" + floatboolean.getFloatValue() );
      }
    }

    return container;
  }
}


class FloatBool
{
  float   floatValue;
  boolean booleanValue;

  public FloatBool( float floatValue, boolean booleanValue )
  {
    this.floatValue = floatValue;
    this.booleanValue = booleanValue;
  }

  public boolean getBooleanValue()
  {
    return booleanValue;
  }

  public float getFloatValue()
  {
    return floatValue;
  }
}

尚不完美，但应该为您提供如何设计自己的渲染器的想法。

在同一个JTable单元格中渲染多个对象

1 个答案: