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cookbook

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();
            }
        }
    }
}