src/java/org/apache/fop/area/RegionViewport.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/* $Id$ */

package org.apache.fop.area;

import java.awt.geom.Rectangle2D;
import java.io.IOException;
import java.util.HashMap;

/**
 * Region Viewport area.
 * This object represents the region-viewport-area.  It has a
 * region-reference-area as its child.  These areas are described
 * in the fo:region-body description in the XSL Recommendation.
 */
public class RegionViewport extends Area implements Cloneable {
    // this rectangle is relative to the page
    private RegionReference regionReference;
    private Rectangle2D viewArea;
    private boolean clip = false;

    /**
     * Create a new region-viewport-area
     *
     * @param viewArea the view area of this viewport
     */
    public RegionViewport(Rectangle2D viewArea) {
        this.viewArea = viewArea;
        addTrait(Trait.IS_VIEWPORT_AREA, Boolean.TRUE);
    }

    /**
     * Set the region-reference-area for this region viewport.
     *
     * @param reg the child region-reference-area inside this viewport
     */
    public void setRegionReference(RegionReference reg) {
        regionReference = reg;
    }

    /**
     * Get the region-reference-area for this region viewport.
     *
     * @return the child region-reference-area inside this viewport
     */
    public RegionReference getRegionReference() {
        return regionReference;
    }

    /**
     * Set the clipping for this region viewport.
     *
     * @param c the clipping value
     */
    public void setClip(boolean c) {
        clip = c;
    }

    /** @return true if the viewport should be clipped. */
    public boolean isClip() {
        return this.clip;
    }

    /**
     * Get the view area of this viewport.
     *
     * @return the viewport rectangle area
     */
    public Rectangle2D getViewArea() {
        return viewArea;
    }

    private void writeObject(java.io.ObjectOutputStream out)
    throws IOException {
        out.writeFloat((float) viewArea.getX());
        out.writeFloat((float) viewArea.getY());
        out.writeFloat((float) viewArea.getWidth());
        out.writeFloat((float) viewArea.getHeight());
        out.writeBoolean(clip);
        out.writeObject(props);
        out.writeObject(regionReference);
    }

    private void readObject(java.io.ObjectInputStream in)
            throws IOException, ClassNotFoundException {
        viewArea = new Rectangle2D.Float(in.readFloat(), in.readFloat(),
                                         in.readFloat(), in.readFloat());
        clip = in.readBoolean();
        props = (HashMap)in.readObject();
        setRegionReference((RegionReference) in.readObject());
    }

    /**
     * Clone this region viewport.
     * Used when creating a copy from the page master.
     *
     * @return a new copy of this region viewport
     */
    public Object clone() {
        RegionViewport rv = new RegionViewport((Rectangle2D)viewArea.clone());
        rv.regionReference = (RegionReference)regionReference.clone();
        if (props != null) {
            rv.props = new HashMap(props);
        }
        if (foreignAttributes != null) {
            rv.foreignAttributes = new HashMap(foreignAttributes);
        }
        return rv;
    }
}