/* $Id: form_and_layers.java,v 1.4 2008/02/14 17:21:51 katja 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 7
 * 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_parameter("SearchPath", searchpath);

        /* This means we must check return values of load_font() etc. */
        p.set_parameter("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: 1.4 $");
        
        /* 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("Wählen 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 grün blau rot weiß} 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();
            }
        }
    }
}