/*
 * Copyright (c) 2009 Max-Planck-Gesellschaft, Martin Hewitson <martin.hewitson at aei.mpg.de>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 *
 */
package mpipeline.pipelinelist;

import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.FontMetrics;
import javax.swing.JComponent;
import javax.swing.JLabel;
import javax.swing.JTree;
import javax.swing.SwingUtilities;
import javax.swing.tree.DefaultTreeCellRenderer;
import mpipeline.canvas.BlockDiagram;
import mpipeline.canvas.MCanvas;

/**
 * A subclass of DefaultTreeCellRenderer that allows us to set the tooltip for
 * the tree given the element we are over.
 * 
 * @author hewitson
 */
public class PipelineListTreeRenderer extends DefaultTreeCellRenderer {

  @Override
  public Component getTreeCellRendererComponent(JTree tree, Object value, boolean sel, boolean expanded, boolean leaf, int row, boolean hasFocus) {
    final Component rc = super.getTreeCellRendererComponent(tree, value, sel, expanded, leaf, row, hasFocus);
    String tooltip = "";

    if (value instanceof PipelineList) {
      PipelineList pl = (PipelineList) value;
      if (pl.isSelected()) {
        rc.setForeground(Color.red);
      }
      else {
        rc.setForeground(Color.black);
      }

      BlockDiagram diag = pl.getDiagram();
      if (diag != null) {
        MCanvas c = diag.getCanvas();
        if (c != null) {
          tooltip = c.getMyInfo().toHTMLString();
        }
      }
    }
    
    String txt = ((JLabel) rc).getText();
    FontMetrics fm = rc.getFontMetrics(rc.getFont());
    int w = SwingUtilities.computeStringWidth(fm, txt);
    w = w + getIcon().getIconWidth() + Math.max(0, getIconTextGap() - 1);

    Dimension d = new Dimension(w, 20);
    rc.setPreferredSize(d);
    rc.setMinimumSize(d);
    rc.setMaximumSize(d);
    rc.setSize(d);

    this.setToolTipText(tooltip);
    return rc;
  }

}