cage/idle_inhibit_v1.c

/*
 * Cage: A Wayland kiosk.
 *
 * Copyright (C) 2018-2019 Jente Hidskes
 *
 * See the LICENSE file accompanying this file.
 */

#include <stdlib.h>
#include <wayland-server-core.h>
#include <wlr/types/wlr_idle.h>
#include <wlr/types/wlr_idle_inhibit_v1.h>

#include "idle_inhibit_v1.h"
#include "server.h"

struct cg_idle_inhibitor_v1 {
	struct cg_server *server;

	struct wl_list link; // server::inhibitors
	struct wl_listener destroy;
};

static void
idle_inhibit_v1_check_active(struct cg_server *server)
{
	/* Due to Cage's unique window management, we don't need to
	   check for visibility. In the worst cage, the inhibitor is
	   spawned by a dialog that _may_ be obscured by another
	   dialog, but this is really an edge case that, until
	   reported, does not warrant the additional complexity.
	   Hence, we simply check for any inhibitors and inhibit
	   accordingly. */
	bool inhibited = !wl_list_empty(&server->inhibitors);
	wlr_idle_set_enabled(server->idle, NULL, !inhibited);
}

static void
handle_destroy(struct wl_listener *listener, void *data)
{
	struct cg_idle_inhibitor_v1 *inhibitor = wl_container_of(listener, inhibitor, destroy);
	struct cg_server *server = inhibitor->server;

	wl_list_remove(&inhibitor->link);
	wl_list_remove(&inhibitor->destroy.link);
	free(inhibitor);

	idle_inhibit_v1_check_active(server);
}

void
handle_idle_inhibitor_v1_new(struct wl_listener *listener, void *data)
{
	struct cg_server *server = wl_container_of(listener, server, new_idle_inhibitor_v1);
	struct wlr_idle_inhibitor_v1 *wlr_inhibitor = data;

	struct cg_idle_inhibitor_v1 *inhibitor = calloc(1, sizeof(struct cg_idle_inhibitor_v1));
	if (!inhibitor) {
		return;
	}

	inhibitor->server = server;
	wl_list_insert(&server->inhibitors, &inhibitor->link);

	inhibitor->destroy.notify = handle_destroy;
	wl_signal_add(&wlr_inhibitor->events.destroy, &inhibitor->destroy);

	idle_inhibit_v1_check_active(server);
}