[libhandy/wip/haecker-felix/flap-widget] Switch child

[Alexander Mikhaylenko <alexm src gnome org>]

commit 16af1d1b5be7093833435fcdb531a12e449c2256
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Tue Nov 17 18:07:18 2020 +0500

    Switch child

 src/hdy-flap.c | 48 +++++++++++++++++++++++++++++-------------------
 1 file changed, 29 insertions(+), 19 deletions(-)
---
diff --git a/src/hdy-flap.c b/src/hdy-flap.c
index 5d5702eb..160e805d 100644
--- a/src/hdy-flap.c
+++ b/src/hdy-flap.c
@@ -241,6 +241,29 @@ set_folded (HdyFlap  *self,
   g_object_notify_by_pspec (G_OBJECT (self), props[PROP_FOLDED]);
 }
 
+static void
+set_reveal_flap (HdyFlap  *self,
+                 gboolean  reveal_flap,
+                 guint64   duration,
+                 gboolean  emit_child_switched)
+{
+  gboolean is_end;
+
+  reveal_flap = !!reveal_flap;
+
+  if (self->reveal_flap == reveal_flap)
+    return;
+
+  self->reveal_flap = reveal_flap;
+
+  animate_reveal (self, reveal_flap ? 1 : 0, duration);
+
+  is_end = self->flap_position == GTK_PACK_END;
+  hdy_swipeable_emit_child_switched (HDY_SWIPEABLE (self), (is_end == reveal_flap) ? 1 : 0, duration);
+
+  g_object_notify_by_pspec (G_OBJECT (self), props[PROP_REVEAL_FLAP]);
+}
+
 static gint
 get_flap_size (HdyFlap        *self,
                GtkAllocation  *widget_alloc,
@@ -907,8 +930,12 @@ hdy_flap_init (HdyFlap *self)
 static void
 hdy_flap_switch_child (HdySwipeable *swipeable,
                        guint         index,
-                       guint64       duration)
+                       gint64        duration)
 {
+  HdyFlap *self = HDY_FLAP (swipeable);
+  gboolean is_end = self->flap_position == GTK_PACK_END;
+
+  set_reveal_flap (self, is_end == (index > 0), duration, FALSE);
 }
 
 static HdySwipeTracker *
@@ -1162,14 +1189,6 @@ hdy_flap_get_reveal_flap (HdyFlap *self)
   return self->reveal_flap;
 }
 
-static void
-set_reveal_flap (HdyFlap  *self,
-                 gboolean  reveal_flap,
-                 guint64   duration)
-{
-
-}
-
 /**
  * hdy_flap_set_reveal_flap:
  * @self: a #HdyFlap
@@ -1183,16 +1202,7 @@ hdy_flap_set_reveal_flap (HdyFlap  *self,
 {
   g_return_if_fail (HDY_IS_FLAP (self));
 
-  reveal_flap = !!reveal_flap;
-
-  if (self->reveal_flap == reveal_flap)
-    return;
-
-  self->reveal_flap = reveal_flap;
-
-  animate_reveal (self, reveal_flap ? 1 : 0, self->reveal_duration);
-
-  g_object_notify_by_pspec (G_OBJECT (self), props[PROP_REVEAL_FLAP]);
+  set_reveal_flap (self, reveal_flap, self->reveal_duration, TRUE);
 }
 
 /**