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Problem GtkHTML comes with a lot of built-in features and functions.
In Part 3 of this series, I'll show you how to allow the user to zoom in and out (i.e. increase or decrease the font) by clicking on the zoom in/out button in the toolbar as shown below:
Solution
- To zoom in, use $gtkhtml->zoom_in().
- To zoom out, use $gtkhtml->zoom_out().
- To reset zoom, use $gtkhtml->zoom_reset().
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 1
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| <?php
$window = new GtkWindow();
$window->set_title($argv[0]);
$window->set_size_request(800, 640);
$window->connect_simple('destroy', array('Gtk','main_quit'));
$window->add($vbox = new GtkVBox());
// define toolbar definition
$toolbar_definition = array('Zoom_In', 'Zoom_Out', 'Zoom_100');
setup_toolbar($vbox, $toolbar_definition); // note 1
$hbox = new GtkHBox();
$vbox->pack_start($hbox, 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');
$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);
$go_button->clicked();
}
// setup toolbar
function setup_toolbar($container, $toolbar_definition) {
$toolbar = new GtkToolBar();
foreach($toolbar_definition as $item) {
if ($item=='<hr>') {
$stock_image_name = 'Gtk::STOCK_'.strtoupper($item);
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- Note that this is only 70% of the sample code. You have to be a registered member to see the entire sample code. Please login or register.
- Registration is free and immediate.
- Have some doubt about the registration? Please read this forum article.
Explanation The above code is extended from the code in How to create a php gtk browser using gtkhtml - Part 2 - click on links?
We also make use of the code from How to set up toolbar? to display the toolbar.
What's new here:
- Set up the toolbar.
- Zoom in.
- Zoom out.
- Zoom reset.
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