[niepce] Remove deprecated g_type_class_add_private()

[Hubert Figuière <hub src gnome org>]

commit 702380619647f22803df1f546390abc200b30edc
Author: Hubert Figuière <hub figuiere net>
Date:   Sun Feb 24 14:11:04 2019 -0500

    Remove deprecated g_type_class_add_private()

 src/niepce/ui/thumb_view/eog-thumb-nav.cpp | 15 +++++----------
 1 file changed, 5 insertions(+), 10 deletions(-)
---
diff --git a/src/niepce/ui/thumb_view/eog-thumb-nav.cpp b/src/niepce/ui/thumb_view/eog-thumb-nav.cpp
index c0cc6d8..1d84cc5 100644
--- a/src/niepce/ui/thumb_view/eog-thumb-nav.cpp
+++ b/src/niepce/ui/thumb_view/eog-thumb-nav.cpp
@@ -34,11 +34,6 @@
 #include "eog-thumb-nav.hpp"
 #include "thumbstripview.hpp"
 
-#define EOG_THUMB_NAV_GET_PRIVATE(object) \
-       (G_TYPE_INSTANCE_GET_PRIVATE ((object), EOG_TYPE_THUMB_NAV, EogThumbNavPrivate))
-
-G_DEFINE_TYPE (EogThumbNav, eog_thumb_nav, GTK_TYPE_BOX)
-
 #define EOG_THUMB_NAV_SCROLL_INC     1
 #define EOG_THUMB_NAV_SCROLL_MOVE    20
 #define EOG_THUMB_NAV_SCROLL_TIMEOUT 20
@@ -62,6 +57,8 @@ struct _EogThumbNavPrivate {
        ui::ThumbStripView   *thumbview;
 };
 
+G_DEFINE_TYPE_WITH_PRIVATE (EogThumbNav, eog_thumb_nav, GTK_TYPE_BOX)
+
 static void
 eog_thumb_nav_adj_changed (GtkAdjustment *adj, gpointer user_data)
 {
@@ -70,7 +67,7 @@ eog_thumb_nav_adj_changed (GtkAdjustment *adj, gpointer user_data)
        gdouble upper, page_size;
 
        nav = EOG_THUMB_NAV (user_data);
-       priv = EOG_THUMB_NAV_GET_PRIVATE (nav);
+       priv = (EogThumbNavPrivate *)eog_thumb_nav_get_instance_private (nav);
 
        g_object_get (G_OBJECT (adj),
                      "upper", &upper,
@@ -88,7 +85,7 @@ eog_thumb_nav_adj_value_changed (GtkAdjustment *adj, gpointer user_data)
        gdouble upper, page_size, value;
 
        nav = EOG_THUMB_NAV (user_data);
-       priv = EOG_THUMB_NAV_GET_PRIVATE (nav);
+       priv = (EogThumbNavPrivate *)eog_thumb_nav_get_instance_private (nav);
 
        g_object_get (G_OBJECT (adj),
                      "upper", &upper,
@@ -289,8 +286,6 @@ eog_thumb_nav_class_init (EogThumbNavClass *klass)
                             static_cast<gint>(EogThumbNavMode::MULTIPLE_ROWS),
                             static_cast<gint>(EogThumbNavMode::ONE_ROW),
                             (GParamFlags)(G_PARAM_READABLE | G_PARAM_WRITABLE)));
-
-       g_type_class_add_private (g_object_class, sizeof (EogThumbNavPrivate));
 }
 
 static void
@@ -300,7 +295,7 @@ eog_thumb_nav_init (EogThumbNav *nav)
        GtkAdjustment *adj;
        GtkWidget *arrow;
 
-       nav->priv = EOG_THUMB_NAV_GET_PRIVATE (nav);
+       nav->priv = (EogThumbNavPrivate *)eog_thumb_nav_get_instance_private (nav);
 
        priv = nav->priv;