PDFlib Cookbook

cookbook

interactive/form_and_layers

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/* $Id: form_and_layers.java,v 1.8 2013/03/26 15:38:01 stm Exp $
 * Forms and Layers:
 * Define two layers for English or German contents and hide or show
 * them via form field buttons 
 * 
 * Define two layers for displaying some text and a "combobox" form field
 * together with its list items in English or German. Create the two form field
 * buttons "English" and "Deutsch" which show the English or the German layer
 * when the user presses the respective button.
 * 
 * Required software: PDFlib/PDFlib+PDI/PPS 9
 * Required data: none
 */
package com.pdflib.cookbook.pdflib.interactive;

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

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

        pdflib p = null;
        String optlist;
        int font, en_act, de_act, layerEN, layerDE;
        double width = 100, height = 18, llx = 100, lly = 600;

        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 "Layers" navigation tab visible */
            if (p.begin_document(outfile, "openmode=layers") == -1)
                throw new Exception("Error: " + p.get_errmsg());

            p.set_info("Creator", "PDFlib Cookbook");
            p.set_info("Title", title + " $Revision: 1.8 $");

            /* Load the font */
            font = p.load_font("Helvetica", "winansi", "");
            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 as well as
             * a form field of type "combobox" with some English list items on
             * it
             * ----------------------------------------------------------------
             * --
             */
            layerEN = p.define_layer("English", "");
            p.begin_layer(layerEN);

            /* Output an English combobox title */
            p.setfont(font, 12);
            p.fit_textline(
                "Choose a color from the list or enter an individual "
                    + "color:", llx, lly, "");
            lly -= 30;

            /*
             * Create the "color" form field of type "combobox" with some
             * English list items and a height similar to the height of one list
             * item
             */
            optlist = "font="
                + font
                + " fontsize=14 backgroundcolor={gray 0.9} "
                + "bordercolor={gray 0.7} itemnamelist={0 1 2 3 4} currentvalue=4 "
                + "itemtextlist={yellow green blue red white} editable=true layer="
                + layerEN;

            p.create_field(llx, lly, llx + width, lly + height, "color",
                "combobox", optlist);

            /*
             * -----------------------------------------------------------------
             * Define the layer "German" and place some German text as well as a
             * form field of type "combobox" with some German list items on it
             * -----------------------------------------------------------------
             */
            layerDE = p.define_layer("German", "initialviewstate=false "
                + "initialprintstate=false");
            p.begin_layer(layerDE);

            lly = 600;
            p.fit_textline(
                "W\u00E4hlen Sie eine Farbe aus der Liste oder geben Sie "
                    + "eine eigene Farbe ein:", llx, lly, "");
            lly -= 30;

            /*
             * Create the "farbe" form field of type "combobox" with some German
             * list items and a height similar to the height of one list item
             */

            optlist = "font="
                + font
                + " fontsize=14 backgroundcolor={gray 0.9} "
                + "bordercolor={gray 0.7} itemnamelist={0 1 2 3 4} currentvalue=4 "
                + "itemtextlist={gelb gr\u00FCn blau rot wei\u00DF} editable=true layer="
                + layerDE;

            p.create_field(llx, lly, llx + width, lly + height, "farbe",
                "combobox", optlist);

            /*
             * 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.
             */
            en_act = p.create_action("SetOCGState", "layerstate={on " + layerEN
                + "}");

            /*
             * 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.
             */
            de_act = p.create_action("SetOCGState", "layerstate={on " + layerDE
                + "}");

            /*
             * Create the "english" and "german" form fields of type
             * "pushbutton". Using the action defined above switch to the other
             * layer when the user releases the mouse button inside the field's
             * area (action={up <actionhandle>}).
             */
            lly = 680;
            optlist =
                "bordercolor={rgb 0.25 0 0.95} backgroundcolor={rgb 0.95 0.95 1} "
                + "fillcolor={rgb 0.25 0 0.95} font=" + font + " fontsize=14";

            p.create_field(llx, lly, llx + width, lly + height, "english",
                "pushbutton", optlist + " caption={English} action={up "
                    + en_act + "}");

            llx += 150;

            p.create_field(llx, lly, llx + width, lly + height, "german",
                "pushbutton", optlist + " caption={Deutsch} action={up "
                    + de_act + "}");

            /* Complete all layers */
            p.end_layer();

            p.end_page_ext("");

            p.end_document("");

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