preso

#!/usr/bin/env python

# python-gtk-webkit presentation program.
# Copyright (C) 2009,2011 by Akkana Peck.
# Share and enjoy under the GPL v2 or later.
# Version 0.6

import sys, os
import gtk, gobject
import webkit

class PresoViewer(gtk.Window):
    def __init__(self, url):

        # Are we making screenshots? TODO: make this a command-line param.
        self.make_screenshots = False
        self.imgnum = 0

        # Size the audience will see (used for converting to images):
        self.displaywidth = 1024
        self.displayheight = 768
        # Size of the window we'll actually display:
        self.fullwidth = 1366
        self.fullheight = 768

        gtk.Window.__init__(self)

        # set the size to the size of my laptop:
        self.set_default_size(self.fullwidth, self.fullheight)

        # If the physical display is bigger than displaywidth,
        # then it's better not to run fullscreen.
        if gtk.gdk.screen_height() <= self.displayheight :
            self.fullscreen()

        self.browser = webkit.WebView()
        self.add(self.browser)
        self.connect('destroy', gtk.main_quit)
        self.browser.connect("title-changed", self.title_changed)

        self.browser.connect("key-press-event", self.key_press_event)

        self.browser.open(url)    # throw err if url isn't defined
        self.show_all()

    # An attempt to print to PDF. None of this works.
    # Nobody seems to know how to do it from Python, though
    # there's a C++ webkit printing example that's said to work:
    #   https://github.com/antialize/wkhtmltopdf
    # There's also this, a standalone app, but it seems to render
    # to a bitmap then convert that to PDF.
    #   https://github.com/marianoguerra/webshot/blob/master/webshot.py
    # And there's commandlineprint, which uses firefox, not webkit:
    #   http://sites.google.com/site/torisugari/commandlineprint2
    # Other links:
    #   http://eegg.wordpress.com/2010/01/17/html-to-pdf/
    #   http://notes.alexdong.com/xhtml-to-pdf-using-pyqt4-webkit-and-headless
    #
    # def pdf(self) :
    #     webframe = self.browser.get_main_frame()
    #     # Even the simple print dialog solution they use from the
    #     # python-webkit example doesn't work. It doesn't work in
    #     # the example, either.
    #     webframe.print_full(gtk.PrintOperation(),
    #                         gtk.PRINT_OPERATION_ACTION_PRINT_DIALOG);

    #     op = gtk.PrintOperation()
    #     #op.set_n_pages(1)

    #     filename = "/tmp/screenshot%03d.pdf" % self.imgnum
    #     op.set_export_filename(filename)
    #     #op.connect("begin-print", self.begin_print_cb)
    #     #op.connect("draw-page", self.draw_page_cb)
    #     #op.run(gtk.PRINT_OPERATION_ACTION_EXPORT, self)

    #     print 'Trying to export to', filename
    #     webframe.print_full(op, gtk.PRINT_OPERATION_ACTION_EXPORT)
    #     print 'exported to', filename, ', maybe'

    def screenshot(self) :
        '''Save a screenshot to a jpg file'''
        pixmap = self.get_snapshot(gtk.gdk.Rectangle(0, 0,
                                                     self.displaywidth,
                                                     self.displayheight))
        pixbuf = gtk.gdk.Pixbuf(gtk.gdk.COLORSPACE_RGB, False, 8,
                                self.displaywidth, self.displayheight)
        pixbuf.get_from_drawable(self.window, self.get_colormap(),
                                 0, 0, 0, 0,
                                 self.displaywidth, self.displayheight)
        pixbuf.save("screenshot%03d.jpg" % self.imgnum, "jpeg")

    def key_press_event(self, widget, event) :
        if event.keyval == gtk.keysyms.q and \
                 event.state == gtk.gdk.CONTROL_MASK :
            print "Bye!"
            gtk.main_quit()

        elif event.string == ' ' :
            self.imgnum += 1

            # If we're in screen-shooting mode, save the current slide:
            if self.make_screenshots :
                self.screenshot()
                return False
        elif event.keyval == gtk.keysyms.r :
            if event.state == gtk.gdk.SHIFT_MASK :
                self.browser.reload_bypass_cache()
            else :
                self.browser.reload()
            return True
        return False     # False means we haven't handled, pass event on

    def title_changed(self, webview, frame, title):
        self.set_title(title)

if __name__ == "__main__":
    if len(sys.argv) <= 1 :
        print "Usage:", sys.argv[0], "url"
        sys.exit(0)

    # Figure out if it's a filename or a url
    url = sys.argv[1]
    if url.find(':') < 0 :
        if url[0] == '/' :
            url = 'file://' + url
        else :
            url = 'file://' + os.getcwd() + '/' + url

    gobject.threads_init()
    webbrowser = PresoViewer(url)
    gtk.main()