The JTable when JPanel as TableCellRenderer using custom text alignment issues

Hello

I have some difficulty with the text alignment/border issues when you use a custom TableCellRenderer. I use a JPanel with GroupLayout (although I also tried others like FlowLayout), and I can't get the text of the label in the JPanel to align with other cells in the table. The text within my 'panel' cell is moved down. If I use the code of the DefaultTableCellRenderer allows you to set the border when the cell receives focus, the problem gets worse as the text moves when the new border is applied to the Group of experts on the selection of the cell. Here's a NBS to show:

import java.awt.Color;
import java.awt.Component;
import java.awt.EventQueue;
import javax.swing.GroupLayout;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTable;
import javax.swing.border.Border;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;
import sun.swing.DefaultLookup;

public class TableCellPanelTest extends JFrame {

  private class PanelRenderer extends JPanel implements TableCellRenderer {

    private JLabel label = new JLabel();

    public PanelRenderer() {
      GroupLayout layout = new GroupLayout(this);
      layout.setHorizontalGroup(layout.createParallelGroup().addComponent(label));
      layout.setVerticalGroup(layout.createParallelGroup().addComponent(label));
      setLayout(layout);
    }

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

      if (isSelected) {
        setBackground(table.getSelectionBackground());
      } else {
        setBackground(table.getBackground());
      }
      
      // Border section taken from DefaultTableCellRenderer
      if (hasFocus) {
        Border border = null;
        if (isSelected) {
          border = DefaultLookup.getBorder(this, ui, "Table.focusSelectedCellHighlightBorder");
        }
        if (border == null) {
          border = DefaultLookup.getBorder(this, ui, "Table.focusCellHighlightBorder");
        }
        setBorder(border);

        if (!isSelected && table.isCellEditable(row, column)) {
          Color col;
          col = DefaultLookup.getColor(this, ui, "Table.focusCellForeground");
          if (col != null) {
            super.setForeground(col);
          }
          col = DefaultLookup.getColor(this, ui, "Table.focusCellBackground");
          if (col != null) {
            super.setBackground(col);
          }
        }
      } else {
        setBorder(null /*getNoFocusBorder()*/);
      }

      // Set up our label
      label.setText(value.toString());
      label.setFont(table.getFont());

      return this;
    }
  }

  public TableCellPanelTest() {
    JTable table = new JTable(new Integer[][]{{1, 2, 3}, {4, 5, 6}}, new String[]{"A", "B", "C"});

    // set up a custom renderer on the first column
    TableColumn firstColumn = table.getColumnModel().getColumn(0);
    firstColumn.setCellRenderer(new PanelRenderer());

    getContentPane().add(table);
    pack();
  }

  public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {

      public void run() {
        new TableCellPanelTest().setVisible(true);
      }
    });
  }
}

There are essentially two issues:

(1) when the first round, the text in the custom converter column is shifted down a little.
(2) once a column cell is selected, it moves down still further.

I'd appreciate any help to understand what is happening!

Thank you!

(1) LayoutManagers need to take into account the border if the label is placed at (1,1) while the labels just start at (0,0) of the cell Rect. The layout manager also tend not not to reduce the component less than their minimum size. Defining minimum size labels to (0,0) seems to have the same effect in your example. Do the same for the maximum size helps if you set the height of the largest JTable line. Maybe easier to use BorderLayout, which ignores min/max for the Center (and a height min/max for East/West, etc.).
(2) DefaultTableCellRenderer uses a 1px border if the UI update borderless is null, you do not have.
(3) include a setDefaultCloseOperation is a NBS please. I think that I have a test of hundreds of current programs: P.

Tags: Java

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The JTable when JPanel as TableCellRenderer using custom text alignment issues

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