Sample Code 15: How to put a clickable link in GtkLabel - Part 1? |
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Written by kksou
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Friday, 15 September 2006 |
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Problem You want to put a clickable link in GtkLabel as shown below:
Solution GtkLabel does not respond to button-press-event.
However, a GtkEventBox does.
So just put the GtkLabel inside the GtkEventBox, and you have a clickable label!
Sample Code 1
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| <?php
$window = new GtkWindow();
$window->set_size_request(400, 100);
$window->connect_simple('destroy', array('Gtk','main_quit'));
$window->add($vbox = new GtkVBox());
// displays a title
$title = new GtkLabel();
$title->set_markup('<span color="blue" font_desc="Times New Roman Italic 12">
Clilckable Link</span>');
$vbox->pack_start($title);
// create the clickable label
$clickable_label = new GtkHBox(); // note 1
$vbox->pack_start($clickable_label);
$clickable_label->pack_start(new GtkLabel("reference: php-gtk2 "), 0, 0);
$clickable_label->pack_start(make_link("manual", "http://gtk.php.net/manual/en/gtkclasses.php"), 0, 0);
$clickable_label->pack_start(new GtkLabel(" and "), 0, 0);
$clickable_label->pack_start(make_link("mailing list", "http://www.nabble.com/Php---GTK---General-f171.html"), 0, 0);
// function to setup the link
function make_link($title, $url) {
$label = new GtkLabel($title);
$label->set_markup('<span color="blue"><u>'.$title."</u></span>");
$eventbox = new GtkEventBox; // note 2
$eventbox->add($label);
$eventbox->connect('button-press-event', 'link_clicked', $title, $url); // note 3
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Explanation
- Create a GtkHBox to join up normal text and links.
- As explained above, a
GtkLabel cannot detect mouse click. So we need to create a GtkEventBox, place the label in the eventbox, and capture the mouse click through the EventBox.
- Note that we can pass user-defined information along when setting up the call-back functions, in this case
$title and $url. In this way, we can write just one call-back functions to handle all the links, instead of one call-back function for each link.
- This is the call-back function that is called when user click on the link. Here it just displays
$title and $url in the command window. You can add your code here to perform some actions.
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