PDFlib 8 Windows COM/.NET Tutorial

{
/* Error handling */
return;
}
p.begin_page_ext(pagewidth, pageheight, "");
...
String optlist = "action={up " + print_action + "} icon=" + print_icon +
" tooltip={Print the document} font=" + button_font;
p.create_field(left_x, left_y, right_x, right_y, "print_button", "pushbutton", optlist);
Cookbook A full code sample can be found in the Cookbook topic interactive/form_pushbutton.
Simple text field. Now we create a text field near the upper right corner of the page.
The user will be able to enter the current date in this field. We acquire a font handle and
create a form field of type textfield which is called date, and has a gray background:
textfield_font = p.load_font("Helvetica-Bold", "unicode", "");
String optlist = "backgroundcolor={gray 0.8} font=" + textfield_font;
p.create_field(left_x, left_y, right_x, right_y, "date", "textfield", optlist);
By default the font size is auto, which means that initially the field height is used as the
font size. When the input reaches the end of the field the font size is decreased so that
the text always fits into the field.
Cookbook Full code samples can be found in the Cookbook topics in teractive/form_textfield_layout
and interactive/form_textfield_height.
Text field with JavaScript. In order to improve the text form field created above we automatically
fill it with the current date when the page is opened. First we create an action
of type JavaScript (in Acrobat: Run a JavaScript). The script option in the action’s option
list defines a JavaScript snippet which displays the current date in the date text
field in the format month-day-year:
String optlist =
"script={var d = util.printd('mmm dd yyyy', new Date()); "
"var date = this.getField('date'); date.value = d;}"
show_date = p.create_action("JavaScript", optlist);
In the second step we create the page. In the option list we supply the action option
which attaches the show_date action created above to the trigger event open (in Acrobat:
Page Open):
String optlist = "action={open " + show_date + "}";
p.begin_page_ext(pagewidth, pageheight, optlist);
Finally we create the text field as we did above. It will automatically be filled with the
current date whenever the page is opened:
textfield_font = p.load_font("Helvetica-Bold", "winansi", "");
String optlist = "backgroundcolor={gray 0.8} font=" + textfield_font;
p.create_field(left_x, left_y, right_x, right_y, "date", "textfield", optlist);
90 Chapter 3: Creating PDF Documents (Edition for COM, .NET, and REALbasic)