/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.log4j.chainsaw;

import javax.swing.*;
import javax.swing.border.Border;
import javax.swing.table.TableColumn;
import java.awt.*;


/**
 * A ListCellRenderer that display a check box if the value
 * has been "checked".
 * <p>
 * Borrowed heavily from the excellent book "Swing, 2nd Edition" by
 * Matthew Robinson &amp; Pavel Vorobiev.
 *
 * @author Paul Smith
 */
public abstract class CheckListCellRenderer extends JCheckBox
    implements ListCellRenderer {
    private final Border noFocusBorder =
        BorderFactory.createEmptyBorder(1, 1, 1, 1);

    /**
     *
     */
    public CheckListCellRenderer() {
        super();
        setOpaque(true);
        setBorder(noFocusBorder);
    }

    /* (non-Javadoc)
     * @see javax.swing.ListCellRenderer#getListCellRendererComponent(javax.swing.JList, java.lang.Object, int, boolean, boolean)
     */
    public Component getListCellRendererComponent(
        JList list, Object value, int index, boolean isSelected,
        boolean cellHasFocus) {
        setText(((TableColumn) value).getHeaderValue().toString());
        setBackground(
            isSelected ? list.getSelectionBackground() : list.getBackground());
        setForeground(
            isSelected ? list.getSelectionForeground() : list.getForeground());
        setFont(list.getFont());
        setBorder(
            cellHasFocus ? UIManager.getBorder("List.focusCellHighlightBorder")
                : noFocusBorder);

        setSelected(isSelected(value));
        return this;
    }

    /**
     * @param value
     * @return selected flag
     */
    protected abstract boolean isSelected(Object value);
}