printoperation.js

const Gtk = imports.gi.Gtk;
const Lang = imports.lang;
const Poppler = imports.gi.Poppler;

const FILE_NAME = 'file:///home/fborges/Documents/test.pdf';

const PrintOperationExample = new Lang.Class({
    Name: 'PrintOperationExample',
    Extends: Gtk.Application,

    _init: function() {
        this.parent({ application_id: 'com.example.PrintOperationExample' }); 
    },

    vfunc_startup: function() {
        this.parent();

        this.operation = new Gtk.PrintOperation();
        this.operation.connect('begin-print', this.begin_print.bind(this));
        this.operation.connect('draw-page', this.draw_page.bind(this));

        this.doc = Poppler.Document.new_from_file(FILE_NAME, '');
    },

    begin_print: function(operation, context, data) {
        operation.set_n_pages(this.doc.get_n_pages());
    },

    draw_page: function(operation, context, page_num, data) {
        let cr = context.get_cairo_context()
        let page = this.doc.get_page(page_num);
        page.render(cr);
    },

    run_print_operation: function() {
        let result = this.operation.run(Gtk.PrintOperationAction.PRINT_DIALOG, null);

        if (result == Gtk.PrintOperationResult.ERROR) {
            log(self.operation.get_error());
        }
    },

    vfunc_activate: function() {
        this._window = new Gtk.ApplicationWindow({
            application: this,
            title: "Print Operation example"
        }); 
        let button = new Gtk.Button({
            label: "Print",
        });

        this._window.add(button);

        button.connect('clicked', this.run_print_operation.bind(this));

        this._window.show_all();
    },
});

let app = new PrintOperationExample();
app.run(ARGV);