[gtk/wip/chergert/switcher-orientable] stackswitcher: implement GtkOrientable

[Christian Hergert <chergert src gnome org>]

commit fda18339de7b4cf33c6f969c289a94a153d5a953
Author: Christian Hergert <chergert redhat com>
Date:   Fri May 28 11:50:25 2021 -0700

    stackswitcher: implement GtkOrientable
    
    In GTK 3, GtkStackSwitcher implemented GtkOrientable via the parent GtkBox
    type. In GTK 4, that was changed to inherit from GtkWidget and lost this
    interface implementation.
    
    This adds that back, along with a note in the documentation that the
    interface was added in GTK 4.4.
    
    Fixes #3988

 gtk/gtkstackswitcher.c | 39 ++++++++++++++++++++++++++++++++++++---
 1 file changed, 36 insertions(+), 3 deletions(-)
---
diff --git a/gtk/gtkstackswitcher.c b/gtk/gtkstackswitcher.c
index c738babf65..102c7271b5 100644
--- a/gtk/gtkstackswitcher.c
+++ b/gtk/gtkstackswitcher.c
@@ -26,6 +26,7 @@
 #include "gtkimage.h"
 #include "gtkintl.h"
 #include "gtklabel.h"
+#include "gtkorientable.h"
 #include "gtkprivate.h"
 #include "gtkselectionmodel.h"
 #include "gtktogglebutton.h"
@@ -62,6 +63,12 @@
  *
  * `GtkStackSwitcher` uses the %GTK_ACCESSIBLE_ROLE_TAB_LIST role
  * and uses the %GTK_ACCESSIBLE_ROLE_TAB for its buttons.
+ *
+ * # Orientable
+ *
+ * Since GTK 4.4, `GtkStackSwitcher` implements `GtkOrientable` allowing
+ * the stack switcher to be made vertical with
+ * `gtk_orientable_set_orientation()`.
  */
 
 #define TIMEOUT_EXPAND 500
@@ -75,6 +82,7 @@ struct _GtkStackSwitcher
   GtkStack *stack;
   GtkSelectionModel *pages;
   GHashTable *buttons;
+  GtkOrientation orientation;
 };
 
 struct _GtkStackSwitcherClass
@@ -84,15 +92,18 @@ struct _GtkStackSwitcherClass
 
 enum {
   PROP_0,
-  PROP_STACK
+  PROP_STACK,
+  PROP_ORIENTATION
 };
 
-G_DEFINE_TYPE (GtkStackSwitcher, gtk_stack_switcher, GTK_TYPE_WIDGET)
+G_DEFINE_TYPE_WITH_CODE (GtkStackSwitcher, gtk_stack_switcher, GTK_TYPE_WIDGET,
+                         G_IMPLEMENT_INTERFACE (GTK_TYPE_ORIENTABLE, NULL))
 
 static void
 gtk_stack_switcher_init (GtkStackSwitcher *switcher)
 {
   switcher->buttons = g_hash_table_new_full (g_direct_hash, g_direct_equal, g_object_unref, NULL);
+  switcher->orientation = GTK_ORIENTATION_HORIZONTAL;
 
   gtk_widget_add_css_class (GTK_WIDGET (switcher), "linked");
 }
@@ -216,7 +227,7 @@ gtk_stack_switcher_switch_timeout (gpointer data)
   return G_SOURCE_REMOVE;
 }
 
-static void 
+static void
 gtk_stack_switcher_drag_enter (GtkDropControllerMotion *motion,
                                double                   x,
                                double                   y,
@@ -442,9 +453,14 @@ gtk_stack_switcher_get_property (GObject      *object,
                                  GParamSpec   *pspec)
 {
   GtkStackSwitcher *switcher = GTK_STACK_SWITCHER (object);
+  GtkLayoutManager *box_layout = gtk_widget_get_layout_manager (GTK_WIDGET (switcher));
 
   switch (prop_id)
     {
+    case PROP_ORIENTATION:
+      g_value_set_enum (value, gtk_orientable_get_orientation (GTK_ORIENTABLE (box_layout)));
+      break;
+
     case PROP_STACK:
       g_value_set_object (value, switcher->stack);
       break;
@@ -462,9 +478,24 @@ gtk_stack_switcher_set_property (GObject      *object,
                                  GParamSpec   *pspec)
 {
   GtkStackSwitcher *switcher = GTK_STACK_SWITCHER (object);
+  GtkLayoutManager *box_layout = gtk_widget_get_layout_manager (GTK_WIDGET (switcher));
 
   switch (prop_id)
     {
+    case PROP_ORIENTATION:
+      {
+        GtkOrientation orientation = g_value_get_enum (value);
+        if (switcher->orientation != orientation)
+          {
+            switcher->orientation = orientation;
+            gtk_orientable_set_orientation (GTK_ORIENTABLE (box_layout),
+                                            switcher->orientation);
+            gtk_widget_update_orientation (GTK_WIDGET (switcher), switcher->orientation);
+            g_object_notify (object, "orientation");
+          }
+      }
+      break;
+
     case PROP_STACK:
       gtk_stack_switcher_set_stack (switcher, g_value_get_object (value));
       break;
@@ -520,6 +551,8 @@ gtk_stack_switcher_class_init (GtkStackSwitcherClass *class)
                                                         GTK_PARAM_READWRITE |
                                                         G_PARAM_CONSTRUCT));
 
+  g_object_class_override_property (object_class, PROP_ORIENTATION, "orientation");
+
   gtk_widget_class_set_layout_manager_type (widget_class, GTK_TYPE_BOX_LAYOUT);
   gtk_widget_class_set_css_name (widget_class, I_("stackswitcher"));
   gtk_widget_class_set_accessible_role (widget_class, GTK_ACCESSIBLE_ROLE_TAB_LIST);