source: josm/trunk/src/org/openstreetmap/josm/gui/history/NodeListTableCellRenderer.java@ 12888

// License: GPL. For details, see LICENSE file.
package org.openstreetmap.josm.gui.history;

import static org.openstreetmap.josm.tools.I18n.tr;

import java.awt.Color;
import java.awt.Component;

import javax.swing.ImageIcon;
import javax.swing.JLabel;
import javax.swing.JTable;
import javax.swing.table.TableCellRenderer;

import org.openstreetmap.josm.gui.history.TwoColumnDiff.Item.DiffItemType;
import org.openstreetmap.josm.gui.util.GuiHelper;
import org.openstreetmap.josm.tools.ImageProvider;

/**
 * A {@link TableCellRenderer} for the {@link NodeListViewer}.
 * 
 * Renders information about a node when comparing the node list of two
 * historical versions of a way.
 */
public class NodeListTableCellRenderer extends JLabel implements TableCellRenderer {

    public static final Color BGCOLOR_SELECTED = new Color(143, 170, 255);

    private final ImageIcon nodeIcon;

    /**
     * Constructs a new {@code NodeListTableCellRenderer}.
     */
    public NodeListTableCellRenderer() {
        setOpaque(true);
        nodeIcon = ImageProvider.get("data", "node");
        setIcon(nodeIcon);
    }

    protected void renderNode(TwoColumnDiff.Item item, boolean isSelected) {
        String text = "";
        setIcon(nodeIcon);
        if (item.value != null) {
            text = tr("Node {0}", item.value.toString());
        }
        Color bgColor = item.state.getColor();
        if (item.state == DiffItemType.EMPTY) {
            text = "";
            setIcon(null);
        }
        if (isSelected) {
            bgColor = BGCOLOR_SELECTED;
        }
        setText(text);
        GuiHelper.setBackgroundReadable(this, bgColor);
    }

    // Warning: The model pads with null-rows to match the size of the opposite table. 'value' could be null
    @Override
    public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus,
            int row, int column) {

        if (value != null) {
            renderNode((TwoColumnDiff.Item) value, isSelected);
        }
        return this;
    }
}