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Problem In Part 2, I've showed you how to display tooltip with markup text on a GtkButton.
In this Part 3, instead of displaying text, we will display an image (using GtkImage with any standard graphics format such as .gif, .jpg, .png, etc.) as shown below:
Key method used: GtkTooltip::set_custom().
Solution
- The setup of tooltip is exactly the same as that of Part 1.
- The only difference is that instead of using
GtkTooltip::set_text() , we use GtkTooltip::set_custom() to display the image.
Important Note: This only works for PHP-GTK v2.0 (or PHP-GTK2 compliled with gtk+ v2.12 and above. If you are using an older version, for linux, you may follow the step-by-step instructions to recompile php-gtk2 with gtk+ v2.12. For windows, please refer to How to install php gtk2 on windows?
Sample Code The following image files are required by the sample code below. Please save a copy of the image files and put them in the same directory where you store the sample code.
 | ball_blue48.png |
 | ball_green48.png |
 | ball_yellow48.png |
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| <?php
$window = new GtkWindow();
$window->set_title($argv[0]);
$window->connect_simple('destroy', array( 'Gtk', 'main_quit'));
$window->set_size_request(400,150);
$window->add($vbox = new GtkVBox());
// display title
$title = new GtkLabel("Display tooltip on GtkButton using GtkTooltip\n".
" Part 3 - display tooltip with image!");
$title->modify_font(new PangoFontDescription("Times New Roman Italic 10"));
$title->modify_fg(Gtk::STATE_NORMAL, GdkColor::parse("#0000ff"));
$title->set_size_request(-1, 60);
$vbox->pack_start($title, 0, 0);
$vbox->pack_start($hbox=new GtkHBox(), 0, 0);
create_button($hbox, 'Blue', 'ball_blue48.png');
create_button($hbox, 'Green', 'ball_green48.png');
create_button($hbox, 'Yellow', 'ball_yellow48.png');
$window->show_all();
Gtk::main();
function create_button($hbox, $button_label, $img) {
$button = new GtkButton($button_label);
$button->set_size_request(80, 32);
$hbox->pack_start($button, 1, 0);
$button->connect('clicked', "on_button", $button_label);
$button->set_property('has-tooltip', true); // note 1
$button->connect('query-tooltip', 'on_tooltip', $img); // note 2
}
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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
- Enable tooltip on the widget.
- Connect to the signal
'query-tooltip'.
- Load the image file.
- Display the image in the tooltip.
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