/*
 * Copyright 2012-2017 Red Hat, Inc.
 *
 * This file is part of Thermostat.
 *
 * Thermostat 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, or (at your
 * option) any later version.
 *
 * Thermostat 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 Thermostat; see the file COPYING.  If not see
 * <http://www.gnu.org/licenses/>.
 *
 * Linking this code with other modules is making a combined work
 * based on this code.  Thus, the terms and conditions of the GNU
 * General Public License cover the whole combination.
 *
 * As a special exception, the copyright holders of this code give
 * you permission to link this code with independent modules to
 * produce an executable, regardless of the license terms of these
 * independent modules, and to copy and distribute the resulting
 * executable under terms of your choice, provided that you also
 * meet, for each linked independent module, the terms and conditions
 * of the license of that module.  An independent module is a module
 * which is not derived from or based on this code.  If you modify
 * this code, you may extend this exception to your version of the
 * library, but you are not obligated to do so.  If you do not wish
 * to do so, delete this exception statement from your version.
 */

package com.redhat.thermostat.client.swing.experimental;

import java.awt.Component;
import java.awt.event.HierarchyListener;

import javax.swing.JComponent;

import com.redhat.thermostat.client.core.views.BasicView;
import com.redhat.thermostat.client.core.views.BasicView.Action;
import com.redhat.thermostat.client.swing.ComponentVisibleListener;
import com.redhat.thermostat.common.ActionNotifier;

/**
 * Attach a listener to a swing Component that will automatically fire
 * appropriate {@link Action} events.
 */
public class ComponentVisibilityNotifier {

    private HierarchyListener listener;

    public ComponentVisibilityNotifier() {
        // nothing to do
    }

    public void initialize(final JComponent swingComponent, final ActionNotifier<BasicView.Action> notifier) {
        if (listener != null) {
            throw new IllegalStateException("Already initialized");
        }

        listener = new ComponentVisibleListener() {
            @Override
            public void componentShown(Component component) {
                notifier.fireAction(Action.VISIBLE);
            }
            @Override
            public void componentHidden(Component component) {
                notifier.fireAction(Action.HIDDEN);
            }
        };
        swingComponent.addHierarchyListener(listener);
    }

    public void dispose(final JComponent swingComponent) {
        if (listener != null) {
            swingComponent.removeHierarchyListener(listener);
        }
    }
}