[clutter/wip/touchpad-gestures: 4/4] clutter-event: Add API around touchpad gesture events

[Carlos Garnacho <carlosg src gnome org>]

commit f73c9cde4c9505a02d9ea2973ce305b9523d889b
Author: Carlos Garnacho <carlosg gnome org>
Date:   Wed Jul 1 15:15:41 2015 +0200

    clutter-event: Add API around touchpad gesture events
    
    These are needed in order to make these events binding friendly

 clutter/clutter-event.c            |  117 ++++++++++++++++++++++++++++++++++++
 clutter/clutter-event.h            |   14 ++++
 doc/reference/clutter-sections.txt |    4 +
 3 files changed, 135 insertions(+), 0 deletions(-)
---
diff --git a/clutter/clutter-event.c b/clutter/clutter-event.c
index 1fcd0e4..b13b049 100644
--- a/clutter/clutter-event.c
+++ b/clutter/clutter-event.c
@@ -1907,3 +1907,120 @@ clutter_event_remove_filter (guint id)
 
   g_warning ("No event filter found for id: %d\n", id);
 }
+
+/**
+ * clutter_event_get_gesture_swipe_finger_count:
+ * @event: a touchpad swipe event
+ *
+ * Returns the number of fingers that is triggering the touchpad gesture.
+ *
+ * Returns: the number of fingers swiping.
+ *
+ * Since: 1.24
+ **/
+guint
+clutter_event_get_gesture_swipe_finger_count (const ClutterEvent *event)
+{
+  g_return_val_if_fail (event != NULL, 0);
+  g_return_val_if_fail (event->type == CLUTTER_TOUCHPAD_SWIPE_BEGIN ||
+                        event->type == CLUTTER_TOUCHPAD_SWIPE_UPDATE ||
+                        event->type == CLUTTER_TOUCHPAD_SWIPE_END ||
+                        event->type == CLUTTER_TOUCHPAD_SWIPE_CANCEL, 0);
+
+  return event->touchpad_swipe.n_fingers;
+}
+
+/**
+ * clutter_event_get_gesture_pinch_angle_delta:
+ * @event: a touchpad pinch event
+ *
+ * Returns the angle delta reported by this specific event.
+ *
+ * Returns: The angle delta relative to the previous event.
+ *
+ * Since: 1.24
+ **/
+gdouble
+clutter_event_get_gesture_pinch_angle_delta (const ClutterEvent *event)
+{
+  g_return_val_if_fail (event != NULL, 0);
+  g_return_val_if_fail (event->type == CLUTTER_TOUCHPAD_PINCH_BEGIN ||
+                        event->type == CLUTTER_TOUCHPAD_PINCH_UPDATE ||
+                        event->type == CLUTTER_TOUCHPAD_PINCH_END ||
+                        event->type == CLUTTER_TOUCHPAD_PINCH_CANCEL, 0);
+
+  return event->touchpad_pinch.angle_delta;
+}
+
+/**
+ * clutter_event_get_gesture_pinch_scale:
+ * @event: a touchpad pinch event
+ *
+ * Returns the current scale as reported by @event, 1.0 being the original
+ * distance as reported in the %CLUTTER_TOUCHPAD_PINCH_BEGIN event
+ *
+ * Returns: the pinch gesture current scale
+ *
+ * Since: 1.24
+ **/
+gdouble
+clutter_event_get_gesture_pinch_scale (const ClutterEvent *event)
+{
+  g_return_val_if_fail (event != NULL, 0);
+  g_return_val_if_fail (event->type == CLUTTER_TOUCHPAD_PINCH_BEGIN ||
+                        event->type == CLUTTER_TOUCHPAD_PINCH_UPDATE ||
+                        event->type == CLUTTER_TOUCHPAD_PINCH_END ||
+                        event->type == CLUTTER_TOUCHPAD_PINCH_CANCEL, 0);
+
+  return event->touchpad_pinch.scale;
+}
+
+/**
+ * clutter_event_get_gesture_motion_delta:
+ * @event: A clutter touchpad gesture event
+ * @dx: (out) (allow-none): the displacement relative to the pointer
+ *      position in the X axis, or %NULL
+ * @dy: (out) (allow-none): the displacement relative to the pointer
+ *      position in the Y axis, or %NULL
+ *
+ * Returns the gesture motion deltas relative to the current pointer
+ * position.
+ *
+ * Since: 1.24
+ **/
+void
+clutter_event_get_gesture_motion_delta (const ClutterEvent *event,
+                                        gdouble            *dx,
+                                        gdouble            *dy)
+{
+  g_return_val_if_fail (event != NULL, FALSE);
+  g_return_val_if_fail (event->type == CLUTTER_TOUCHPAD_PINCH_BEGIN ||
+                        event->type == CLUTTER_TOUCHPAD_PINCH_UPDATE ||
+                        event->type == CLUTTER_TOUCHPAD_PINCH_END ||
+                        event->type == CLUTTER_TOUCHPAD_PINCH_CANCEL ||
+                        event->type == CLUTTER_TOUCHPAD_SWIPE_BEGIN ||
+                        event->type == CLUTTER_TOUCHPAD_SWIPE_UPDATE ||
+                        event->type == CLUTTER_TOUCHPAD_SWIPE_END ||
+                        event->type == CLUTTER_TOUCHPAD_SWIPE_CANCEL, FALSE);
+
+  if (event->type == CLUTTER_TOUCHPAD_PINCH_BEGIN ||
+      event->type == CLUTTER_TOUCHPAD_PINCH_UPDATE ||
+      event->type == CLUTTER_TOUCHPAD_PINCH_END ||
+      event->type == CLUTTER_TOUCHPAD_PINCH_CANCEL)
+    {
+      if (dx)
+        *dx = event->touchpad_pinch.dx;
+      if (dy)
+        *dy = event->touchpad_pinch.dy;
+    }
+  else if (event->type == CLUTTER_TOUCHPAD_SWIPE_BEGIN ||
+           event->type == CLUTTER_TOUCHPAD_SWIPE_UPDATE ||
+           event->type == CLUTTER_TOUCHPAD_SWIPE_END ||
+           event->type == CLUTTER_TOUCHPAD_SWIPE_CANCEL)
+    {
+      if (dx)
+        *dx = event->touchpad_swipe.dx;
+      if (dy)
+        *dy = event->touchpad_swipe.dy;
+    }
+}
diff --git a/clutter/clutter-event.h b/clutter/clutter-event.h
index 330e900..b145bfd 100644
--- a/clutter/clutter-event.h
+++ b/clutter/clutter-event.h
@@ -618,6 +618,20 @@ guint32                 clutter_get_current_event_time          (void);
 CLUTTER_AVAILABLE_IN_1_2
 const ClutterEvent *    clutter_get_current_event               (void);
 
+CLUTTER_AVAILABLE_IN_1_24
+guint                   clutter_event_get_gesture_swipe_finger_count (const ClutterEvent     *event);
+
+CLUTTER_AVAILABLE_IN_1_24
+gdouble                 clutter_event_get_gesture_pinch_angle_delta  (const ClutterEvent     *event);
+
+CLUTTER_AVAILABLE_IN_1_24
+gdouble                 clutter_event_get_gesture_pinch_scale        (const ClutterEvent     *event);
+
+CLUTTER_AVAILABLE_IN_1_24
+void                    clutter_event_get_gesture_motion_delta       (const ClutterEvent     *event,
+                                                                      gdouble                *dx,
+                                                                      gdouble                *dy);
+
 G_END_DECLS
 
 #endif /* __CLUTTER_EVENT_H__ */
diff --git a/doc/reference/clutter-sections.txt b/doc/reference/clutter-sections.txt
index f0c601c..910b9eb 100644
--- a/doc/reference/clutter-sections.txt
+++ b/doc/reference/clutter-sections.txt
@@ -1131,6 +1131,10 @@ clutter_event_get_position
 clutter_event_has_control_modifier
 clutter_event_has_shift_modifier
 clutter_event_is_pointer_emulated
+clutter_event_get_gesture_swipe_finger_count
+clutter_event_get_gesture_pinch_angle_delta
+clutter_event_get_gesture_pinch_scale
+clutter_event_get_gesture_motion_delta
 
 <SUBSECTION>
 clutter_event_get