com.barrybecker4.ui.table.HeaderRenderer Maven / Gradle / Ivy

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/** Copyright by Barry G. Becker, 2000-2011. Licensed under MIT License: http://www.opensource.org/licenses/MIT  */
package com.barrybecker4.ui.table;

import javax.swing.*;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.JTableHeader;
import java.awt.*;

/**
 * Use this for a TableHeader Renderer instead of the DefaultTableCellRenderer
 *
 * @author Barry Becker
 */
public class HeaderRenderer extends DefaultTableCellRenderer {

    public HeaderRenderer() {
        setHorizontalAlignment(SwingConstants.CENTER);
        setOpaque(true);

        // This call is needed because DefaultTableCellRenderer calls setBorder()
        // in its constructor, which is executed after updateUI()
        setBorder(UIManager.getBorder("TableHeader.cellBorder"));
    }

    @Override
    public void updateUI() {
        super.updateUI();
        setBorder(UIManager.getBorder("TableHeader.cellBorder"));
    }

    @Override
    public Component getTableCellRendererComponent(JTable table, Object value,
                       boolean selected, boolean focused, int row, int column) {
        JTableHeader h = table != null ? table.getTableHeader() : null;

        if (h != null) {
            setEnabled(h.isEnabled());
            setComponentOrientation(h.getComponentOrientation());

            setForeground(h.getForeground());
            setBackground(h.getBackground());
            setFont(h.getFont());
        }
        else {
            /* Use sensible values instead of random leftover values from the last call */
            setEnabled(true);
            setComponentOrientation(ComponentOrientation.UNKNOWN);

            setForeground(UIManager.getColor("TableHeader.foreground"));
            setBackground(UIManager.getColor("TableHeader.background"));
            setFont(UIManager.getFont("TableHeader.font"));
        }

        setValue(value);

        return this;
    }
}