[libhandy] swipe-tracker: Add update-swipe signal

[Adrien Plazas <aplazas src gnome org>]

commit a2cf3709e32f83e0106784d913823af6f286c876
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Sat Jun 20 16:51:24 2020 +0500

    swipe-tracker: Add update-swipe signal
    
    This will replace HdySwipeable's signal and at the same time allow
    swipeables to connect to it instead of overriding update_swipe() there,
    making it clear the 2 classes are closely related and are only meant to be
    used together.
    
    Signed-off-by: Alexander Mikhaylenko <alexm gnome org>

 src/hdy-swipe-tracker-private.h |  2 ++
 src/hdy-swipe-tracker.c         | 30 ++++++++++++++++++++++++++++++
 2 files changed, 32 insertions(+)
---
diff --git a/src/hdy-swipe-tracker-private.h b/src/hdy-swipe-tracker-private.h
index 8d364a0d..9faad4cf 100644
--- a/src/hdy-swipe-tracker-private.h
+++ b/src/hdy-swipe-tracker-private.h
@@ -41,5 +41,7 @@ void             hdy_swipe_tracker_shift_position (HdySwipeTracker *self,
 void             hdy_swipe_tracker_emit_begin_swipe (HdySwipeTracker        *self,
                                                      HdyNavigationDirection  direction,
                                                      gboolean                direct);
+void             hdy_swipe_tracker_emit_update_swipe (HdySwipeTracker *self,
+                                                      gdouble          progress);
 
 G_END_DECLS
diff --git a/src/hdy-swipe-tracker.c b/src/hdy-swipe-tracker.c
index f704ac73..7afee98e 100644
--- a/src/hdy-swipe-tracker.c
+++ b/src/hdy-swipe-tracker.c
@@ -92,6 +92,7 @@ static GParamSpec *props[LAST_PROP];
 
 enum {
   SIGNAL_BEGIN_SWIPE,
+  SIGNAL_UPDATE_SWIPE,
   SIGNAL_LAST_SIGNAL,
 };
 
@@ -175,6 +176,7 @@ gesture_update (HdySwipeTracker *self,
   self->progress = progress;
 
   hdy_swipeable_update_swipe (self->swipeable, progress);
+  hdy_swipe_tracker_emit_update_swipe (self, progress);
 
   self->prev_time = time;
 }
@@ -771,6 +773,25 @@ hdy_swipe_tracker_class_init (HdySwipeTrackerClass *klass)
                   G_TYPE_NONE,
                   2,
                   HDY_TYPE_NAVIGATION_DIRECTION, G_TYPE_BOOLEAN);
+
+  /**
+   * HdySwipeTracker::update-swipe:
+   * @self: The #HdySwipeTracker instance
+   * @progress: The current animation progress value
+   *
+   * This signal is emitted every time the progress value changes.
+   *
+   * Since: 1.0
+   */
+  signals[SIGNAL_UPDATE_SWIPE] =
+    g_signal_new ("update-swipe",
+                  G_TYPE_FROM_CLASS (klass),
+                  G_SIGNAL_RUN_FIRST,
+                  0,
+                  NULL, NULL, NULL,
+                  G_TYPE_NONE,
+                  1,
+                  G_TYPE_DOUBLE);
 }
 
 static void
@@ -986,3 +1007,12 @@ hdy_swipe_tracker_emit_begin_swipe (HdySwipeTracker        *self,
 
   g_signal_emit (self, signals[SIGNAL_BEGIN_SWIPE], 0, direction, direct);
 }
+
+void
+hdy_swipe_tracker_emit_update_swipe (HdySwipeTracker *self,
+                                     gdouble          progress)
+{
+  g_return_if_fail (HDY_IS_SWIPE_TRACKER (self));
+
+  g_signal_emit (self, signals[SIGNAL_UPDATE_SWIPE], 0, progress);
+}