Topic Like Button for bbPress

HSP

Can I customise the button?

Yes. The easiest way to do this is to pass in attributes when initially calling bbp_topic_like_button().

You can pass in attributes to set a custom user_id or topic_id, set before or after html, customise the button text
or add custom classes to the button.

Here is an example setting all possible custom options:

$args = [
    'user_id'  => get_current_user_id(),
    'topic_id' => bbp_get_topic_id(),
    'before'   => '',
    'after'    => '',
    'like'     => __('Like', 'your-domain'),
    'unlike'   => __('Unlike', 'your-domain'),
    'class'    => ['my-custom-class', 'another-custom-class'],
];
bbp_topic_like_button($args);

It is also possible to implement the filter get_bbp_topic_like_button to make any final changes to the rendered html.

Can I trigger a custom event when the like button is clicked

Yes, the action bbp_topic_like_button_clicked is fired on every button press.

E.g. implement like this:

add_action('bbp_topic_like_button_clicked', 'my_plugin_bbp_topic_like_button_clicked', 10, 3);
function my_plugin_bbp_topic_like_button_clicked($res, $user_id, $topic_id) {
    // Add code here to do something.
}