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MAN page from CentOS 8 wayland-devel-1.17.0-1.el8.x86_64.rpm

wl_listener

Section: Wayland (3)
Updated: Tue Apr 7 2020
Index 

NAME

wl_listener - A single listener for Wayland signals.

 

SYNOPSIS


#include <wayland-server-core.h> 

Data Fields


struct wl_list link

wl_notify_func_t notify
 

Detailed Description

A single listener for Wayland signals.

wl_listener provides the means to listen for wl_signal notifications. Many Wayland objects use wl_listener for notification of significant events like object destruction.

Clients should create wl_listener objects manually and can register them as listeners to signals using wl_signal_add, assuming the signal is directly accessible. For opaque structs like wl_event_loop, adding a listener should be done through provided accessor methods. A listener can only listen to one signal at a time.

struct wl_listener your_listener;your_listener.notify = your_callback_method;// Direct accesswl_signal_add(&some_object->destroy_signal, &your_listener);// Accessor accesswl_event_loop *loop = ...;wl_event_loop_add_destroy_listener(loop, &your_listener);

If the listener is part of a larger struct, wl_container_of can be used to retrieve a pointer to it:

void your_listener(struct wl_listener *listener, void *data){        struct your_data *data;        your_data = wl_container_of(listener, data, your_member_name);}

If you need to remove a listener from a signal, use wl_list_remove().

wl_list_remove(&your_listener.link);

See also:

wl_signal

 

Field Documentation

 

struct wl_list wl_listener::link

 

wl_notify_func_t wl_listener::notify

 

Author

Generated automatically by Doxygen for Wayland from the source code.


 

Index

NAME
SYNOPSIS
Data Fields
Detailed Description
Field Documentation
struct wl_list wl_listener::link
wl_notify_func_t wl_listener::notify
Author

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