[gtk/issue-1863: 2/3] Use gtk_widget_class_set_layout_manager_type()

[Emmanuele Bassi <ebassi src gnome org>]

commit 59c6862a0301d4c922f6adc36c81f859997555ba
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Mon May 6 12:06:27 2019 +0100

    Use gtk_widget_class_set_layout_manager_type()
    
    Instead of manually creating the layout manager inside the instance
    initialization function, we can let GtkWidget do that for us.

 gtk/gtkbox.c               | 4 +---
 gtk/gtkfilechooserbutton.c | 4 ++--
 gtk/gtkfilechooserwidget.c | 4 ++--
 gtk/gtkfixed.c             | 6 ++++--
 gtk/gtkgrid.c              | 5 +++--
 gtk/gtkoverlay.c           | 5 +++--
 6 files changed, 15 insertions(+), 13 deletions(-)
---
diff --git a/gtk/gtkbox.c b/gtk/gtkbox.c
index 1491d8d007..616b7d6e44 100644
--- a/gtk/gtkbox.c
+++ b/gtk/gtkbox.c
@@ -161,6 +161,7 @@ gtk_box_class_init (GtkBoxClass *class)
 
   g_object_class_install_properties (object_class, LAST_PROP, props);
 
+  gtk_widget_class_set_layout_manager_type (widget_class, GTK_TYPE_BOX_LAYOUT);
   gtk_widget_class_set_accessible_role (widget_class, ATK_ROLE_FILLER);
   gtk_widget_class_set_css_name (widget_class, I_("box"));
 }
@@ -344,12 +345,9 @@ static void
 gtk_box_init (GtkBox *box)
 {
   GtkBoxPrivate *priv = gtk_box_get_instance_private (box);
-  GtkLayoutManager *box_layout = gtk_box_layout_new (GTK_ORIENTATION_HORIZONTAL);
 
   gtk_widget_set_has_surface (GTK_WIDGET (box), FALSE);
 
-  gtk_widget_set_layout_manager (GTK_WIDGET (box), box_layout);
-
   priv->orientation = GTK_ORIENTATION_HORIZONTAL;
   _gtk_orientable_set_style_classes (GTK_ORIENTABLE (box));
 }
diff --git a/gtk/gtkfilechooserbutton.c b/gtk/gtkfilechooserbutton.c
index eb4d883955..8b87409f84 100644
--- a/gtk/gtkfilechooserbutton.c
+++ b/gtk/gtkfilechooserbutton.c
@@ -422,6 +422,8 @@ gtk_file_chooser_button_class_init (GtkFileChooserButtonClass * class)
   _gtk_file_chooser_install_properties (gobject_class);
 
   gtk_widget_class_set_css_name (widget_class, I_("filechooserbutton"));
+
+  gtk_widget_class_set_layout_manager_type (widget_class, GTK_TYPE_BIN_LAYOUT);
 }
 
 static void
@@ -497,8 +499,6 @@ gtk_file_chooser_button_init (GtkFileChooserButton *button)
                     target_list,
                     GDK_ACTION_COPY);
   gdk_content_formats_unref (target_list);
-
-  gtk_widget_set_layout_manager (GTK_WIDGET (button), gtk_bin_layout_new ());
 }
 
 
diff --git a/gtk/gtkfilechooserwidget.c b/gtk/gtkfilechooserwidget.c
index 915c615b78..a5915769e9 100644
--- a/gtk/gtkfilechooserwidget.c
+++ b/gtk/gtkfilechooserwidget.c
@@ -8326,6 +8326,8 @@ gtk_file_chooser_widget_class_init (GtkFileChooserWidgetClass *class)
   gtk_widget_class_bind_template_callback (widget_class, widget_key_press_cb);
 
   gtk_widget_class_set_css_name (widget_class, I_("filechooser"));
+
+  gtk_widget_class_set_layout_manager_type (widget_class, GTK_TYPE_BIN_LAYOUT);
 }
 
 static void
@@ -8467,8 +8469,6 @@ gtk_file_chooser_widget_init (GtkFileChooserWidget *impl)
    */
   post_process_ui (impl);
 
-  gtk_widget_set_layout_manager (GTK_WIDGET (impl), gtk_bin_layout_new ());
-
   profile_end ("end", NULL);
 }
 
diff --git a/gtk/gtkfixed.c b/gtk/gtkfixed.c
index 4f0ae14241..24af3fd513 100644
--- a/gtk/gtkfixed.c
+++ b/gtk/gtkfixed.c
@@ -96,11 +96,14 @@ static void
 gtk_fixed_class_init (GtkFixedClass *klass)
 {
   GtkContainerClass *container_class = GTK_CONTAINER_CLASS (klass);
+  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
 
   container_class->add = gtk_fixed_add;
   container_class->remove = gtk_fixed_remove;
   container_class->forall = gtk_fixed_forall;
   container_class->child_type = gtk_fixed_child_type;
+
+  gtk_widget_class_set_layout_manager_type (widget_class, GTK_TYPE_FIXED_LAYOUT);
 }
 
 static GType
@@ -117,8 +120,7 @@ gtk_fixed_init (GtkFixed *self)
   gtk_widget_set_has_surface (GTK_WIDGET (self), FALSE);
   gtk_widget_set_overflow (GTK_WIDGET (self), GTK_OVERFLOW_HIDDEN);
 
-  priv->layout = gtk_fixed_layout_new ();
-  gtk_widget_set_layout_manager (GTK_WIDGET (self), priv->layout);
+  priv->layout = gtk_widget_get_layout_manager (GTK_WIDGET (self)); 
 }
 
 /**
diff --git a/gtk/gtkgrid.c b/gtk/gtkgrid.c
index f68468d769..18d005280b 100644
--- a/gtk/gtkgrid.c
+++ b/gtk/gtkgrid.c
@@ -380,6 +380,8 @@ gtk_grid_class_init (GtkGridClass *class)
   g_object_class_install_properties (object_class, N_PROPERTIES, obj_properties);
 
   gtk_widget_class_set_css_name (widget_class, I_("grid"));
+
+  gtk_widget_class_set_layout_manager_type (widget_class, GTK_TYPE_GRID_LAYOUT);
 }
 
 static void
@@ -389,8 +391,7 @@ gtk_grid_init (GtkGrid *grid)
 
   gtk_widget_set_has_surface (GTK_WIDGET (grid), FALSE);
 
-  priv->layout_manager = gtk_grid_layout_new ();
-  gtk_widget_set_layout_manager (GTK_WIDGET (grid), priv->layout_manager);
+  priv->layout_manager = gtk_widget_get_layout_manager (GTK_WIDGET (grid));
 
   priv->orientation = GTK_ORIENTATION_HORIZONTAL;
   _gtk_orientable_set_style_classes (GTK_ORIENTABLE (grid));
diff --git a/gtk/gtkoverlay.c b/gtk/gtkoverlay.c
index 5195f9ac0a..13af196f40 100644
--- a/gtk/gtkoverlay.c
+++ b/gtk/gtkoverlay.c
@@ -302,6 +302,8 @@ gtk_overlay_class_init (GtkOverlayClass *klass)
                   GDK_TYPE_RECTANGLE | G_SIGNAL_TYPE_STATIC_SCOPE);
 
   gtk_widget_class_set_css_name (widget_class, I_("overlay"));
+
+  gtk_widget_class_set_layout_manager_type (widget_class, GTK_TYPE_OVERLAY_LAYOUT);
 }
 
 static void
@@ -311,8 +313,7 @@ gtk_overlay_init (GtkOverlay *overlay)
 
   gtk_widget_set_has_surface (GTK_WIDGET (overlay), FALSE);
 
-  priv->layout = gtk_overlay_layout_new ();
-  gtk_widget_set_layout_manager (GTK_WIDGET (overlay), priv->layout);
+  priv->layout = gtk_widget_get_layout_manager (GTK_WIDGET (overlay));
 }
 
 static GtkBuildableIface *parent_buildable_iface;