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interactive/form_textfield_layout

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/* $Id: form_textfield_layout.java,v 1.6 2013/01/15 10:12:00 stm Exp $

 * Form text field layout:

 * Specify the layout of a form field of type "textfield" for displaying a date

 *

 * Create a text field with equidistant subfields for storing a date.

 * The following field properties are defined: font and font size, border and

 * fill color, initial value, maximum characters allowed, scroll behaviour,

 * and tootip.

 *

 * 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_textfield_layout

{

    public static void main (String argv[])

    {

    /* This is where the data files are. Adjust as necessary */

    String searchpath = "../input";

    String outfile = "form_textfield_layout.pdf";

    String title = "Form Text Field Layout";

   

    pdflib p = null;


    String optlist;

    int font, monospaced_font;

    double fontsize, ascender, descender;

    double width=140, height=30, llx = 10, lly = 700;


    try {

        p = new pdflib();


        /* This means we must check return values of load_font() etc. */

        p.set_option("errorpolicy=return");


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


        if (p.begin_document(outfile, "") == -1)

            throw new Exception("Error: " + p.get_errmsg());


        p.set_info("Creator", "PDFlib Cookbook");

        p.set_info("Title", title + " $Revision: 1.6 $");


        font = p.load_font("Helvetica", "winansi", "");

        if (font == -1)

            throw new Exception("Error: " + p.get_errmsg());

       

        monospaced_font = p.load_font("Courier", "winansi", "");

        if (monospaced_font == -1)

            throw new Exception("Error: " + p.get_errmsg());

       

        /* Start page */

        p.begin_page_ext(0, 0, " width=a4.width height=a4.height");

       

        /* Adjust the font size to match the field height: Retrieve the

         * ascender and the descender (the latter is usually negative) of a

         * hypothetical font size equal to the field height and use the font

         * size resulting from the sum of ascender and (positive) descender as

         * a starting point. Then, decrease the font size by e.g. 20% to leave

         * some empty space from the field borders.

         */

        ascender = p.info_font(monospaced_font, "ascender", "fontsize=" +

            height);

        descender = p.info_font(monospaced_font, "descender", "fontsize=" +

            height);

       

        fontsize = (ascender - descender) * 0.8;

       

        /* Create a form field of type "textfield" called "date" with a

         * background color of light blue and a black border.

         * Set an initial date (currentvalue={Sep 10 2007})

         * Allow a maximum of 11 characters to be entered (maxchar=11).

         * The characters are not moved out of the field if the field size is

         * reached (scrollable=false).

         * Display equidistant subfields for each character (comb=true).

         * A tooltip is displayed when the user moves in the field

         * tooltip={Enter a date}.

         */

        optlist = "backgroundcolor={rgb 0.95 0.95 1} bordercolor={gray 0} " +

        "currentvalue={Sep 10 2007} maxchar=11 scrollable=false comb=true " +

        "tooltip={Enter a date} font=" + monospaced_font +

        " fontsize=" + fontsize;

   

        p.create_field(llx, lly, llx + width, lly + height, "date", "textfield",

            optlist);

        lly-=40;

   

        p.setfont(font, 12);

        p.fit_textline("Form text field with an initial value set. The " +

            "characters are placed in equidistant subfields.", llx, lly, "");

        p.fit_textline("A maximum of 11 characters is allowed. The text is " +

            "not allowed to scroll out of the window.", llx, lly-=20, "");

        p.fit_textline("A tooltip is displayed when the mouse moves over the " +

            "field.", llx, lly-=20, "");

       

        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();

            }

        }

    }

}