/*
 * StoreKeeper.java - Keeps track of all RText instances (windows) that are
 *                    open, and provides an interface to update their Look and
 *                    Feels together.
 */
package org.fife.rtext;

import java.util.ArrayList;
import javax.swing.LookAndFeel;
import javax.swing.SwingUtilities;

/**
     * Keeps track of all <code>org.fife.rtext.RText</code> instances (windows) that
 * are open, and provides an interface to update their Look and Feels together.
 */
public class StoreKeeper {

  private static ArrayList rtextInstances;

      /*****************************************************************************/

  /**
   * Notes that a new <code>RText</code> window is open.
   *
   * @param rtext The <code>RText</code> instance to remember.
   */
  public static void addRTextInstance(RText rtext) {
    if (rtextInstances == null) {
      rtextInstances = new ArrayList(1);
    }
    rtextInstances.add(rtext);
  }

      /*****************************************************************************/

  /**
   * Gets the number of <code>RText</code> instances (windows) that are
   * currently open.
   *
   * @return The number of <code>RText</code> instances open.
   */
  public static int getInstanceCount() {
    return rtextInstances.size();
  }

      /*****************************************************************************/

  /**
   * Removes an <code>RText</code> instance.
   *
   * @param rtext The <code>RText</code> to remove.
   * @throws NullPointerException If no <code>RText</code> instances have
   *         been remembered yet.
   */
  public static void removeRTextInstance(RText rtext) {
    int index = rtextInstances.indexOf(rtext);
    if (index == -1) {

      //throw new RTextNotFoundException();
      return;
    }
    rtextInstances.remove(index);
  }

      /*****************************************************************************/

  /**
   * Updates the Look and Feel of all <code>RText</code> instances.
   *
   * @param lnf The Look and Feel to change to.
   */
  public static void updateLookAndFeels(final LookAndFeel lnf) {

    final Runnable updateUIThread = new Runnable() {
      public void run() {
        int count = getInstanceCount();
        for (int i = 0; i < count; i++) {
          ( (RText) rtextInstances.get(i)).updateLookAndFeel(lnf);
        }
      }
    };

    // Ensure we update Look and Feels on event dispatch thread.
    try {
      SwingUtilities.invokeLater(updateUIThread);
    }
    catch (Exception e) {
      e.printStackTrace();
    }

  }

      /*****************************************************************************/

}