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implement touch support

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this is mostly plumbing; the most interesting logic is in touch_get_coords
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bi4k8 2021-12-31 23:50:31 +00:00 • committed by Johan Malm
parent a2a2e093ef
commit 4c3bae0794
4 changed files with 137 additions and 0 deletions
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src/touch.c Normal file
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// SPDX-License-Identifier: GPL-2.0-only
#include <wlr/types/wlr_touch.h>
#include "labwc.h"
static struct wlr_surface*
touch_get_coords(struct seat *seat, struct wlr_touch* touch, double x, double y,
double* nx, double* ny)
{
/* Convert coordinates: first [0, 1] => layout, then layout => surface */
double lx, ly;
wlr_cursor_absolute_to_layout_coords(seat->cursor, &touch->base,
x, y, &lx, &ly);
struct wlr_scene_node *node =
wlr_scene_node_at(&seat->server->scene->node, lx, ly, nx, ny);
/* Find the surface and return it if it accepts touch events. */
struct wlr_surface* surface = NULL;
if (node && node->type == WLR_SCENE_NODE_SURFACE) {
struct wlr_scene_surface *scene_surface =
wlr_scene_surface_from_node (node);
surface = scene_surface->surface;
}
if (surface && !wlr_surface_accepts_touch(seat->seat, surface)) {
surface = NULL;
}
return surface;
}
static void
touch_motion(struct wl_listener *listener, void *data)
{
struct seat *seat = wl_container_of(listener, seat, touch_motion);
struct wlr_touch_motion_event *event = data;
wlr_idle_notify_activity(seat->wlr_idle, seat->seat);
double nx, ny;
if (touch_get_coords(seat, event->touch, event->x, event->y, &nx, &ny)) {
wlr_seat_touch_notify_motion(seat->seat, event->time_msec,
event->touch_id, nx, ny);
}
}
static void
touch_frame(struct wl_listener *listener, void *data)
{
struct seat *seat = wl_container_of(listener, seat, touch_frame);
wlr_seat_touch_notify_frame(seat->seat);
}
static void
touch_down(struct wl_listener *listener, void *data)
{
struct seat *seat = wl_container_of(listener, seat, touch_down);
struct wlr_touch_down_event *event = data;
double nx, ny;
struct wlr_surface* surface =
touch_get_coords(seat, event->touch, event->x, event->y, &nx, &ny);
if (surface) {
wlr_seat_touch_notify_down(seat->seat, surface, event->time_msec,
event->touch_id, nx, ny);
}
}
static void
touch_up(struct wl_listener *listener, void *data)
{
struct seat *seat = wl_container_of(listener, seat, touch_up);
struct wlr_touch_up_event *event = data;
wlr_seat_touch_notify_up(seat->seat, event->time_msec, event->touch_id);
}
void
touch_init(struct seat *seat)
{
seat->touch_down.notify = touch_down;
wl_signal_add(&seat->cursor->events.touch_down, &seat->touch_down);
seat->touch_up.notify = touch_up;
wl_signal_add(&seat->cursor->events.touch_up, &seat->touch_up);
seat->touch_motion.notify = touch_motion;
wl_signal_add(&seat->cursor->events.touch_motion, &seat->touch_motion);
seat->touch_frame.notify = touch_frame;
wl_signal_add(&seat->cursor->events.touch_frame, &seat->touch_frame);
}
void
touch_finish(struct seat *seat)
{
wl_list_remove(&seat->touch_down.link);
wl_list_remove(&seat->touch_up.link);
wl_list_remove(&seat->touch_motion.link);
wl_list_remove(&seat->touch_frame.link);
}