471. How to display tooltip on buttons using GtkTooltip - Part 3 - tooltip with image?

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().

How to display tooltip on buttons using GtkTooltip - Part 3 - tooltip with image?


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
}

function on_button($button, $button_label) {
    echo "You have clicked: $button_label!\n";
}

function on_tooltip($widget, $x, $y, $keyboard_mode, $tooltip, $img_file) {
    $label = $widget->get_label();
    global $images;
    $img = GtkImage::new_from_file($img_file); // note 3
    $tooltip->set_custom($img); // note 4
    return true;
}

?>

Output

As shown above.

 

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