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ICEpdf PDF Viewer Reference Implementation (RI)
There is a newer version: 6.2.2
/*
 * Copyright 2006-2016 ICEsoft Technologies Inc.
 *
 * Licensed 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.
 */

package org.icepdf.ri.common.views;

import org.icepdf.core.pobjects.NameTree;
import org.icepdf.core.pobjects.Reference;
import org.icepdf.core.pobjects.StringObject;
import org.icepdf.core.pobjects.actions.FileSpecification;
import org.icepdf.core.util.Library;
import org.icepdf.core.util.Utils;

import javax.swing.*;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import java.awt.*;
import java.awt.event.AdjustmentEvent;
import java.awt.event.AdjustmentListener;
import java.util.HashMap;

/**
 * The CollectionDocumentView is used for documents that specify a PDF Package.
 * A PDF package contains a list of embedded files, much like a zip of related
 * documents.  When initialized each embedded document is represented as an
 * thumbnail icon in a flow layout.
 *
 * @since 5.1.0
 */
public class CollectionDocumentView extends AbstractDocumentView {

    private static final long serialVersionUID = 7220521612114533227L;

    private JPanel collectionDocumentPanel;

    public CollectionDocumentView(DocumentViewController documentViewController,
                                  JScrollPane documentScrollpane, DocumentViewModel documentViewModel) {
        super(documentViewController, documentScrollpane, documentViewModel);

        // put all the gui elements together
        buildGUI();
    }

    private void buildGUI() {
        setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));

        final ModifiedFlowLayout layout = new ModifiedFlowLayout();
        layout.setHgap(15);
        layout.setVgap(15);
        collectionDocumentPanel = new JPanel(layout);
        collectionDocumentPanel.setBackground(BACKGROUND_COLOUR);
        this.setLayout(new BorderLayout());
        this.add(collectionDocumentPanel,
                BorderLayout.CENTER);

        documentScrollpane.getViewport().addChangeListener(new ChangeListener() {
            public void stateChanged(ChangeEvent e) {
                JViewport tmp = (JViewport) e.getSource();
                Dimension dim = layout.computeSize(tmp.getWidth(), collectionDocumentPanel);
                collectionDocumentPanel.setPreferredSize(dim);
            }
        });

        documentScrollpane.getVerticalScrollBar().addAdjustmentListener(
                new AdjustmentListener() {
                    public void adjustmentValueChanged(AdjustmentEvent e) {
                        if (!e.getValueIsAdjusting()) {
                            repaint();
                        }
                    }
                });

        // load the page components into the layout
        DocumentViewComponent documentViewComponent;
        Library library = currentDocument.getCatalog().getLibrary();
        NameTree embeddedFilesNameTree = currentDocument.getCatalog().getNames().getEmbeddedFilesNameTree();
        java.util.List filePairs = embeddedFilesNameTree.getNamesAndValues();

        // add components for every page in the document
        for (int i = 0, max = filePairs.size(); i < max; i += 2) {
            // get the name and document for
            // file name and file specification pairs.
            String fileName = Utils.convertStringObject(library, (StringObject) filePairs.get(i));
            HashMap tmp = (HashMap) library.getObject((Reference) filePairs.get(i + 1));

            // file specification has the document stream
            FileSpecification fileSpec = new FileSpecification(library, tmp);
            tmp = fileSpec.getEmbeddedFileDictionary();

            // create the stream instance from the embedded file streams File entry.
            Reference fileRef = (Reference) tmp.get(FileSpecification.F_KEY);

            documentViewComponent = new DocumentViewComponent(library, fileName, fileRef);
            JPanel documentViewPanel = new JPanel();
            documentViewPanel.setLayout(new BoxLayout(documentViewPanel, BoxLayout.Y_AXIS));
            documentViewPanel.setBackground(BACKGROUND_COLOUR);
            PageViewDecorator pageViewComponent = new PageViewDecorator(documentViewComponent);
            pageViewComponent.setAlignmentX(Component.CENTER_ALIGNMENT);
            documentViewPanel.add(pageViewComponent);
            JLabel fileNameLabel = new JLabel(fileName);
            fileNameLabel.setAlignmentX(Component.CENTER_ALIGNMENT);
            documentViewPanel.add(fileNameLabel);
            collectionDocumentPanel.add(documentViewPanel);
        }
        collectionDocumentPanel.revalidate();
        documentScrollpane.validate();
    }

    @Override
    public void dispose() {
        super.dispose();
        this.removeMouseListener(this);
        collectionDocumentPanel.removeAll();
    }

    @Override
    public void updateDocumentView() {

    }

    public int getNextPageIncrement() {
        return 0;
    }

    public int getPreviousPageIncrement() {
        return 0;
    }

    public Dimension getDocumentSize() {
        return null;
    }
}