touchpad: Add support for swipe gestures

Add support for swipe gestures.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Acked-by: Jason Gerecke <jason.gerecke@wacom.com>

1 files changed, 39 insertions, 0 deletions

diff --git a/src/evdev-mt-touchpad-gestures.c b/src/evdev-mt-touchpad-gestures.c
index 57c07feb..c4216f58 100644
--- a/src/evdev-mt-touchpad-gestures.c
+++ b/src/evdev-mt-touchpad-gestures.c
@@ -75,6 +75,8 @@ tp_get_average_touches_delta(struct tp_dispatch *tp)
 static void
 tp_gesture_start(struct tp_dispatch *tp, uint64_t time)
 {
+	const struct normalized_coords zero = { 0.0, 0.0 };
+
 	if (tp->gesture.started)
 		return;
 
@@ -82,6 +84,13 @@ tp_gesture_start(struct tp_dispatch *tp, uint64_t time)
 	case 2:
 		/* NOP */
 		break;
+	case 3:
+	case 4:
+		gesture_notify_swipe(&tp->device->base, time,
+				     LIBINPUT_EVENT_GESTURE_SWIPE_START,
+				     tp->gesture.finger_count,
+				     &zero, &zero);
+		break;
 	}
 	tp->gesture.started = true;
 }
@@ -136,6 +145,23 @@ tp_gesture_post_twofinger_scroll(struct tp_dispatch *tp, uint64_t time)
 			  &delta);
 }
 
+static void
+tp_gesture_post_swipe(struct tp_dispatch *tp, uint64_t time)
+{
+	struct normalized_coords delta, unaccel;
+
+	unaccel = tp_get_average_touches_delta(tp);
+	delta = tp_filter_motion(tp, &unaccel, time);
+
+	if (!normalized_is_zero(delta) || !normalized_is_zero(unaccel)) {
+		tp_gesture_start(tp, time);
+		gesture_notify_swipe(&tp->device->base, time,
+				     LIBINPUT_EVENT_GESTURE_SWIPE_UPDATE,
+				     tp->gesture.finger_count,
+				     &delta, &unaccel);
+	}
+}
+
 void
 tp_gesture_post_events(struct tp_dispatch *tp, uint64_t time)
 {
@@ -160,6 +186,10 @@ tp_gesture_post_events(struct tp_dispatch *tp, uint64_t time)
 	case 2:
 		tp_gesture_post_twofinger_scroll(tp, time);
 		break;
+	case 3:
+	case 4:
+		tp_gesture_post_swipe(tp, time);
+		break;
 	}
 }
 
@@ -177,6 +207,8 @@ tp_gesture_stop_twofinger_scroll(struct tp_dispatch *tp, uint64_t time)
 void
 tp_gesture_stop(struct tp_dispatch *tp, uint64_t time)
 {
+	const struct normalized_coords zero = { 0.0, 0.0 };
+
 	if (!tp->gesture.started)
 		return;
 
@@ -184,6 +216,13 @@ tp_gesture_stop(struct tp_dispatch *tp, uint64_t time)
 	case 2:
 		tp_gesture_stop_twofinger_scroll(tp, time);
 		break;
+	case 3:
+	case 4:
+		gesture_notify_swipe(&tp->device->base, time,
+				     LIBINPUT_EVENT_GESTURE_SWIPE_END,
+				     tp->gesture.finger_count,
+				     &zero, &zero);
+		break;
 	}
 	tp->gesture.started = false;
 }