/*
 * Copyright (c) 2016, herrg
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * * Neither the name of the jo-widgets.org nor the
 *   names of its contributors may be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL jo-widgets.org BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 */

package org.jowidgets.spi.impl.swing.common.widgets.event;

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

import org.jowidgets.spi.impl.controller.DisposeObservableSpi;
import org.jowidgets.util.Assert;

public class SwingDisposeObservable extends DisposeObservableSpi {

    private boolean wasDisplayable;

    public SwingDisposeObservable(final Component component) {
        Assert.paramNotNull(component, "component");

        this.wasDisplayable = component.isDisplayable();
        component.addHierarchyListener(new HierarchyListener() {
            @Override
            public void hierarchyChanged(final HierarchyEvent e) {
                if ((e.getChangeFlags() & HierarchyEvent.DISPLAYABILITY_CHANGED) != 0) {
                    if (wasDisplayable && !component.isDisplayable()) {
                        fireAfterDispose();
                    }
                    else if (!wasDisplayable && component.isDisplayable()) {
                        wasDisplayable = true;
                    }
                }
            }
        });
    }

}