[libhandy] leaflet: Add get_adjacent_child()

[Adrien Plazas <aplazas src gnome org>]

commit 769010a184d44e17d9b3d40be34b346cb0c3fc24
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Tue Jun 2 00:17:08 2020 +0500

    leaflet: Add get_adjacent_child()
    
    Signed-off-by: Alexander Mikhaylenko <alexm gnome org>

 src/hdy-leaflet.c | 23 +++++++++++++++++++++++
 src/hdy-leaflet.h |  2 ++
 2 files changed, 25 insertions(+)
---
diff --git a/src/hdy-leaflet.c b/src/hdy-leaflet.c
index f8e2729b..0addd255 100644
--- a/src/hdy-leaflet.c
+++ b/src/hdy-leaflet.c
@@ -504,6 +504,29 @@ hdy_leaflet_get_can_swipe_forward (HdyLeaflet *self)
   return hdy_stackable_box_get_can_swipe_forward (HDY_GET_HELPER (self));
 }
 
+/**
+ * hdy_leaflet_get_adjacent_child
+ * @self: a #HdyLeaflet
+ * @direction: the direction
+ *
+ * Gets the previous or next child that doesn't have 'allow-visible' child
+ * property set to %FALSE, or %NULL if it doesn't exist. This will be the same
+ * widget hdy_leaflet_navigate() will navigate to.
+ *
+ * Returns: (nullable) (transfer none): the previous or next child, or
+ *   %NULL if it doesn't exist.
+ *
+ * Since: 1.0
+ */
+GtkWidget *
+hdy_leaflet_get_adjacent_child (HdyLeaflet             *self,
+                                HdyNavigationDirection  direction)
+{
+  g_return_val_if_fail (HDY_IS_LEAFLET (self), NULL);
+
+  return hdy_stackable_box_get_adjacent_child (HDY_GET_HELPER (self), direction);
+}
+
 /**
  * hdy_leaflet_navigate
  * @self: a #HdyLeaflet
diff --git a/src/hdy-leaflet.h b/src/hdy-leaflet.h
index 401db80d..096c1cac 100644
--- a/src/hdy-leaflet.h
+++ b/src/hdy-leaflet.h
@@ -73,6 +73,8 @@ gboolean         hdy_leaflet_get_can_swipe_forward (HdyLeaflet *self);
 void             hdy_leaflet_set_can_swipe_forward (HdyLeaflet *self,
                                                     gboolean    can_swipe_forward);
 
+GtkWidget       *hdy_leaflet_get_adjacent_child (HdyLeaflet             *self,
+                                                 HdyNavigationDirection  direction);
 gboolean         hdy_leaflet_navigate (HdyLeaflet             *self,
                                        HdyNavigationDirection  direction);