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core: Add internal event notification mechanism

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For features like e.g. disable-touchpad-while-typing, it is necessary for one
device to be able to listen into another device's events.

It is tempting to use the existing device_added / device_removed mechanism
to give e.g. the keyboard a link to the touchpad, and make the keyboard code
disable / re-enable the touchpad but this is wrong. This needs to be a setting
of the touchpad, and the policy for things like which events to count as
activity, and what sort of timeout to use to consider the device idle, belongs
in the touchpad code not in the keyboard code.

Add an event listeners mechanism so that the touchpad can listen for (e.g.)
keyboard events, and respond to these itself.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
This commit is contained in:
Hans de Goede 2014-09-28 13:21:02 +02:00 • committed by Peter Hutterer
parent d9631dbe21
commit ad2acca72d
2 changed files with 47 additions and 0 deletions
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19
src/libinput-private.h
View file

@ -144,12 +144,19 @@ struct libinput_device_config {
struct libinput_device {
struct libinput_seat *seat;
struct list link;
struct list event_listeners;
void *user_data;
int terminated;
int refcount;
struct libinput_device_config config;
};
struct libinput_event_listener {
struct list link;
void (*notify_func)(uint64_t time, struct libinput_event *ev, void *notify_func_data);
void *notify_func_data;
};
typedef void (*libinput_source_dispatch_t)(void *data);
@ -205,6 +212,18 @@ void
libinput_device_init(struct libinput_device *device,
struct libinput_seat *seat);
void
libinput_device_add_event_listener(struct libinput_device *device,
struct libinput_event_listener *listener,
void (*notify_func)(
uint64_t time,
struct libinput_event *event,
void *notify_func_data),
void *notify_func_data);
void
libinput_device_remove_event_listener(struct libinput_event_listener *listener);
void
notify_added_device(struct libinput_device *device);

28
src/libinput.c
View file

@ -674,6 +674,7 @@ libinput_device_init(struct libinput_device *device,
{
device->seat = seat;
device->refcount = 1;
list_init(&device->event_listeners);
}
LIBINPUT_EXPORT struct libinput_device *
@ -686,6 +687,7 @@ libinput_device_ref(struct libinput_device *device)
static void
libinput_device_destroy(struct libinput_device *device)
{
assert(list_empty(&device->event_listeners));
evdev_device_destroy((struct evdev_device *) device);
}
@ -732,6 +734,26 @@ libinput_dispatch(struct libinput *libinput)
return 0;
}
void
libinput_device_add_event_listener(struct libinput_device *device,
struct libinput_event_listener *listener,
void (*notify_func)(
uint64_t time,
struct libinput_event *event,
void *notify_func_data),
void *notify_func_data)
{
listener->notify_func = notify_func;
listener->notify_func_data = notify_func_data;
list_insert(&device->event_listeners, &listener->link);
}
void
libinput_device_remove_event_listener(struct libinput_event_listener *listener)
{
list_remove(&listener->link);
}
static uint32_t
update_seat_key_count(struct libinput_seat *seat,
int32_t key,
@ -799,7 +821,13 @@ post_device_event(struct libinput_device *device,
enum libinput_event_type type,
struct libinput_event *event)
{
struct libinput_event_listener *listener, *tmp;
init_event_base(event, device, type);
list_for_each_safe(listener, tmp, &device->event_listeners, link)
listener->notify_func(time, event, listener->notify_func_data);
libinput_post_event(device->seat->libinput, event);
}