/*
 * Layers and bookmarks:
 * Define two layers and hide or show them via bookmarks 
 * 
 * Define two layers for English or German text. Create two bookmarks which
 * show the English or the German layer, respectively.
 * 
 * Required software: PDFlib/PDFlib+PDI/PPS 9
 * Required data: none
 */
package com.pdflib.cookbook.pdflib.graphics;

import com.pdflib.pdflib;
import com.pdflib.PDFlibException;

public class layers_and_bookmarks
{
    public static void main (String argv[])
    {
        /* This is where the data files are. Adjust as necessary. */
        String searchpath = "../input";
        String outfile = "layers_and_bookmarks.pdf";
        String title = "Layers and Bookmarks";

        pdflib p = null;
        int font, action, layerEN, layerDE;
        int exitcode = 0;

        try {
            p = new pdflib();

            p.set_option("searchpath={" + searchpath + "}");

            /* This means we must check return values of load_font() etc. */
            p.set_option("errorpolicy=return");
            
            /* Open the document with the "Bookmarks" navigation tab visible */
            if (p.begin_document(outfile, "openmode=bookmarks") == -1)
                throw new Exception("Error: " + p.get_errmsg());

            p.set_info("Creator", "PDFlib Cookbook");
            p.set_info("Title", title);
            
            /* Load the font */
            font = p.load_font("Helvetica-Bold", "unicode", "");
            if (font == -1) {
                throw new Exception("Error: " + p.get_errmsg());        
            }
            
            /* Start page */
            p.begin_page_ext(0, 0, "width=a4.width height=a4.height");
            
            /* Define the layer "English" and place some English text on it */
            layerEN = p.define_layer("English", "");
            p.begin_layer(layerEN);
            p.fit_textline("Our paper planes are the ideal way of passing the " +
                "time.", 30, 600, "font=" + font + " fontsize=20");
                   
            /* Define the layer "German" which is hidden when opening the document
             * or printing it. Place a German image caption on that layer.
             */
            layerDE = p.define_layer("German", "initialviewstate=false " +
                "initialprintstate=false");
            p.begin_layer(layerDE);
            p.fit_textline("Unsere Papierflieger sind ein idealer Zeitvertreib.",
                30, 600, "font=" + font + " fontsize=20");
                 
            /* At most one of the "English" and "German" layers should be visible */
            p.set_layer_dependency("Radiobtn", "group={" + layerEN + " " +
                layerDE + "}");
            
            /* Create a "SetOCGState" action which shows the English layer. Since
             * at most one layer may be visible we don't need to explicitly hide
             * the German layer.
             */
            action = p.create_action("SetOCGState", "layerstate={on " +
                layerEN + "}");
        
            /* Create a bookmark which activate the action above to shows the layer
             * with the English text
             */
            p.create_bookmark("Show English", " action={activate=" + action + "}");
            
            /* Create a "SetOCGState" action which shows the German layer. Since
             * at most one layer may be visible we don't need to explicitly hide
             * the English layer. */
            action = p.create_action("SetOCGState", "layerstate={on " +
                layerDE + "}");
        
            /* Create a bookmark which activate the action above to shows the layer
             * with the German text
             */
            p.create_bookmark("Show German", " action={activate=" + action + "}");
            
            /* Complete all layers */
            p.end_layer();
           
            p.end_page_ext("");
                    
            p.end_document("");

        } catch (PDFlibException e) {
            System.err.println("PDFlib exception occurred:");
            System.err.println("[" + e.get_errnum() + "] " + e.get_apiname() +
                                ": " + e.get_errmsg());
            exitcode = 1;
        } catch (Exception e) {
            System.err.println(e);
            exitcode = 1;
        } finally {
            if (p != null) {
                p.delete();
            }
            System.exit(exitcode);
        }
    }
}