318. How to create a php gtk browser using gtkhtml - Part 2 - click on links?

Problem

Part 2 of this series extends Part 1 to allow user to follow links in the browser as shown below:

How to create a php gtk browser using gtkhtml - Part 2 - click on links?


Solution

  • We use the signal 'link-clicked' to be notified when the user clicks on a link in the browser.
  • In the signal handler, we first put a copy of the url in GtkEntry, manually simulate a click on the 'Go' button. This will then load the content of the url in the browser.

Important Note:

  • This only works for PHP-GTK2 compliled with the additional library GtkHTML.
  • For linux, you have to recompile php-gtk2 to include this library.
  • For windows, you may refer to the article How to install PHP-GTK2 on windows. The latest beta release from official php-gtk2 website comes complete with GtkHTML.
  • In the php.ini, don't forget to add php-gtk.extensions = php_gtk_html2.dll to turn on GtkHTML.
  • Lastly, the most "tricky" part in running GtkHTML is that to run this script, you have to use gconfd-2 | php script.php.

    If you have installed the beta release of PHP-GTK2 on windows as outlined in this article, you will find the program gconfd-2.exe in the root directory of php-gtk.
  • In the event that you cannot get this sample code to work, I would suggest that you try to do a fresh install of the beta-release of PHP-GTK2 (details here). It should work out-of-the-box (just need to add php-gtk.extensions = php_gtk_html2.dll in php.ini as explained above). Note that you can still keep your original copy of php-gtk2 while having this new version.
  • You will most likely see the warning (php.exe:5348): Gdk-WARNING **: gdkselection-win32.c:1068: OpenClipboard failed: Invalid window handle.. Not really sure how to fix this yet. The script seems to run ok, though.


Sample Code

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<?php
$window = new GtkWindow();
$window->set_title($argv[0]);
$window->set_size_request(400, 250);
$window->connect_simple('destroy', array('Gtk','main_quit'));
$window->add($vbox = new GtkVBox());

$hbox = new GtkHBox();
$vbox->pack_start($hbox, 0);

$hbox->pack_start(new GtkLabel('URL: '), 0);
$hbox->pack_start($url_entry = new GtkEntry('http://gtk.php.net/'));
$hbox->pack_start($go_button = new GtkButton('Go'), 0);
$go_button->set_size_request(32, -1);

$scrolled_win = new GtkScrolledWindow();
$scrolled_win->set_policy( Gtk::POLICY_AUTOMATIC,Gtk::POLICY_AUTOMATIC);
$vbox->pack_start($scrolled_win);
$gtkhtml = new GtkHTML();
$scrolled_win->add($gtkhtml);

$gtkhtml->connect('url-requested', 'on_url_requested');
$gtkhtml->connect('link-clicked', 'on_link_clicked');  // note 1

$url_entry->connect('activate', 'on_url_entry_activate', $go_button);
$go_button->connect('clicked', 'on_go_button', $url_entry, $gtkhtml);
$go_button->clicked();

$window->show_all();
Gtk::main();

function on_url_entry_activate($entry, $go_button) {
    $go_button->clicked();
}

function on_go_button($button, $url_entry, $gtkhtml) {
    $url = $url_entry->get_text();
    $html_text = file_get_contents($url);
    $gtkhtml->set_base($url);
    $gtkhtml->load_from_string($html_text);
}

function on_url_requested($gtkhtml, $url, $stream) {
    echo "image url = $url\n";
    // load the image

}

function on_link_clicked($gtkhtml, $url) {
    global $url_entry, $go_button;
    $url_entry->set_text($url); // note 2
    $go_button->clicked(); // note 3
}

?>

Output

As shown above.
 

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