/*
 * File    : VFlowScrollPane.java
 * Created : 28-sep-2004 09:24
 * By      : fbusquets
 *
 * JClic - Authoring and playing system for educational activities
 *
 * Copyright (C) 2000 - 2018 Francesc Busquets & Departament
 * d'Educacio de la Generalitat de Catalunya
 *
 * 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 2 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 (see the LICENSE file).
 */

package edu.xtec.util;

import java.awt.Component;
import java.awt.Dimension;
import java.awt.FlowLayout;
import javax.swing.JPanel;
import javax.swing.JScrollPane;

/**
 * @author Francesc Busquets (fbusquets@xtec.cat)
 * @version 13.08.29
 */
public class VFlowScrollPane extends JScrollPane {

  JPanel panel;
  int panelHGap, panelVGap;

  public VFlowScrollPane(JPanel view) {
    super(view, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED, JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
    panel = view;
    if (panel.getLayout() instanceof FlowLayout) {
      panelHGap = ((FlowLayout) panel.getLayout()).getHgap();
      panelVGap = ((FlowLayout) panel.getLayout()).getVgap();
    }
  }

  @Override
  public void doLayout() {
    int n = panel.getComponentCount();
    if (n > 0) {
      Dimension minSize = getMinimumSize();
      Component lastCmp = panel.getComponent(n - 1);
      int w = Math.max(minSize.width, getWidth() - getVerticalScrollBar().getWidth() - panelHGap);
      panel.setPreferredSize(new Dimension(w, 9999));
      super.doLayout();
      panel.setPreferredSize(new Dimension(w, lastCmp.getY() + lastCmp.getHeight() + panelVGap));
      invalidate();
    }
    super.doLayout();
  }
}