[gtk/wip/exalm/titlebuttons: 1/3] Add GtkWindowControls



commit 72bba874ce0feefdf1d5adef35c0d6e7751b1725
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Fri Apr 24 17:56:52 2020 +0500

    Add GtkWindowControls
    
    Move some code out of GtkHeaderBar and into a separate widget, making it
    reusable in process.
    
    See https://gitlab.gnome.org/GNOME/gtk/issues/2242

 gtk/gtk.h                      |   1 +
 gtk/gtkwindowcontrols.c        | 690 +++++++++++++++++++++++++++++++++++++++++
 gtk/gtkwindowcontrols.h        |  54 ++++
 gtk/meson.build                |   2 +
 gtk/theme/Adwaita/_common.scss |  79 +++--
 5 files changed, 796 insertions(+), 30 deletions(-)
---
diff --git a/gtk/gtk.h b/gtk/gtk.h
index 8fe078e6a9..a51891e9bc 100644
--- a/gtk/gtk.h
+++ b/gtk/gtk.h
@@ -252,6 +252,7 @@
 #include <gtk/gtkwidget.h>
 #include <gtk/gtkwidgetpaintable.h>
 #include <gtk/gtkwindow.h>
+#include <gtk/gtkwindowcontrols.h>
 #include <gtk/gtkwindowgroup.h>
 
 #include <gtk/gtk-autocleanups.h>
diff --git a/gtk/gtkwindowcontrols.c b/gtk/gtkwindowcontrols.c
new file mode 100644
index 0000000000..4ecabced26
--- /dev/null
+++ b/gtk/gtkwindowcontrols.c
@@ -0,0 +1,690 @@
+/*
+ * Copyright (c) 2020 Alexander Mikhaylenko <alexm gnome org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+ * License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include "config.h"
+
+#include "gtkwindowcontrols.h"
+
+#include "gtkaccessible.h"
+#include "gtkactionable.h"
+#include "gtkboxlayout.h"
+#include "gtkbutton.h"
+#include "gtkenums.h"
+#include "gtkicontheme.h"
+#include "gtkimage.h"
+#include "gtkintl.h"
+#include "gtkprivate.h"
+#include "gtkstylecontext.h"
+#include "gtktypebuiltins.h"
+#include "gtkwindowprivate.h"
+
+/**
+ * SECTION:gtkwindowcontrols
+ * @Short_description: A widget displaying window buttons
+ * @Title: GtkWindowControls
+ * @See_also: #GtkHeaderBar
+ *
+ * GtkWindowControls shows window frame controls, such as minimize, maximize
+ * and close buttons, and the window icon.
+ *
+ * #GtkWindowControls only displays start or end part of the controls (see
+ * #GtkWindowControls:pack-type), so it's intended to be always used in pair
+ * with another #GtkWindowControls using the opposite pack type, for example:
+ *
+ * |[
+ * <object class="GtkBox">
+ *   <child>
+ *     <object class="GtkWindowControls">
+ *       <property name="pack-type">start</property>
+ *     </object>
+ *   </child>
+ *
+ *   ...
+ *
+ *   <child>
+ *     <object class="GtkWindowControls">
+ *       <property name="pack-type">end</property>
+ *     </object>
+ *   </child>
+ * </object>
+ * ]|
+ *
+ * # CSS nodes
+ *
+ * |[<!-- language="plain" -->
+ * windowcontrols
+ * ├── [image.icon]
+ * ├── [button.minimize]
+ * ├── [button.maximize]
+ * ╰── [button.close]
+ * ]|
+ *
+ * A #GtkWindowControls' CSS node is called windowcontrols. It contains
+ * subnodes corresponding to each title button. Which of the title buttons
+ * exist and where they are placed exactly depends on the desktop environment
+ * and #GtkWindowControls:decoration-layout value.
+ *
+ * When #GtkWindowControls:empty is %TRUE, it gets the .empty style class.
+ */
+
+struct _GtkWindowControls {
+  GtkWidget parent_instance;
+
+  GtkPackType pack_type;
+  char *decoration_layout;
+
+  gboolean empty;
+};
+
+enum {
+  PROP_0,
+  PROP_PACK_TYPE,
+  PROP_DECORATION_LAYOUT,
+  PROP_EMPTY,
+  LAST_PROP
+};
+
+static GParamSpec *props[LAST_PROP] = { NULL, };
+
+#define WINDOW_ICON_SIZE 16
+
+G_DEFINE_TYPE (GtkWindowControls, gtk_window_controls, GTK_TYPE_WIDGET)
+
+static char *
+get_layout (GtkWindowControls *self)
+{
+  GtkWidget *widget = GTK_WIDGET (self);
+  GtkWidget *toplevel;
+  char *layout_desc, *layout_half;
+  char **tokens;
+
+  toplevel = GTK_WIDGET (gtk_widget_get_root (widget));
+  if (!GTK_IS_WINDOW (toplevel))
+    return NULL;
+
+  if (self->decoration_layout)
+    layout_desc = g_strdup (self->decoration_layout);
+  else
+    g_object_get (gtk_widget_get_settings (widget),
+                  "gtk-decoration-layout", &layout_desc,
+                  NULL);
+
+  tokens = g_strsplit (layout_desc, ":", 2);
+
+  switch (self->pack_type)
+    {
+    case GTK_PACK_START:
+      layout_half = g_strdup (tokens[0]);
+      break;
+
+    case GTK_PACK_END:
+      layout_half = g_strdup (tokens[1]);
+      break;
+
+    default:
+      g_assert_not_reached ();
+    }
+
+  g_free (layout_desc);
+  g_strfreev (tokens);
+
+  return layout_half;
+}
+
+static GdkPaintable *
+get_default_icon (GtkWidget *widget)
+{
+  GdkDisplay *display = gtk_widget_get_display (widget);
+  GtkIconPaintable *info;
+  int scale = gtk_widget_get_scale_factor (widget);
+
+  info = gtk_icon_theme_lookup_icon (gtk_icon_theme_get_for_display (display),
+                                     gtk_window_get_default_icon_name (),
+                                     NULL,
+                                     WINDOW_ICON_SIZE,
+                                     scale,
+                                     gtk_widget_get_direction (widget),
+                                     0);
+
+  return GDK_PAINTABLE (info);
+}
+
+static gboolean
+update_window_icon (GtkWindow *window,
+                    GtkWidget *icon)
+{
+  GdkPaintable *paintable;
+
+  if (window)
+    paintable = gtk_window_get_icon_for_size (window, WINDOW_ICON_SIZE);
+  else
+    paintable = get_default_icon (icon);
+
+  if (paintable)
+    {
+      gtk_image_set_from_paintable (GTK_IMAGE (icon), paintable);
+      g_object_unref (paintable);
+      gtk_widget_show (icon);
+
+      return TRUE;
+    }
+
+  return FALSE;
+}
+
+static void
+set_empty (GtkWindowControls *self,
+           gboolean           empty)
+{
+  if (empty == self->empty)
+    return;
+
+  self->empty = empty;
+
+  if (empty)
+    gtk_widget_add_css_class (GTK_WIDGET (self), "empty");
+  else
+    gtk_widget_remove_css_class (GTK_WIDGET (self), "empty");
+
+  g_object_notify_by_pspec (G_OBJECT (self), props[PROP_EMPTY]);
+}
+
+static void
+clear_controls (GtkWindowControls *self)
+{
+  GtkWidget *child = gtk_widget_get_first_child (GTK_WIDGET (self));
+
+  while (child)
+    {
+      GtkWidget *next = gtk_widget_get_next_sibling (child);
+
+      gtk_widget_unparent (child);
+
+      child = next;
+    }
+}
+
+static void
+update_window_buttons (GtkWindowControls *self)
+{
+  GtkWidget *widget = GTK_WIDGET (self);
+  GtkWidget *toplevel;
+  char *layout;
+  char **tokens;
+  int i;
+  gboolean is_sovereign_window;
+  gboolean maximized;
+  gboolean resizable;
+  gboolean deletable;
+  gboolean empty = TRUE;
+  GtkWindow *window = NULL;
+
+  toplevel = GTK_WIDGET (gtk_widget_get_root (widget));
+  if (!GTK_IS_WINDOW (toplevel))
+    {      set_empty (self, TRUE);
+
+
+      return;
+    }
+
+  clear_controls (self);
+
+  if (GTK_IS_WINDOW (toplevel))
+    {
+      window = GTK_WINDOW (toplevel);
+
+      is_sovereign_window = !gtk_window_get_modal (window) &&
+                             gtk_window_get_transient_for (window) == NULL;
+      maximized = gtk_window_is_maximized (window);
+      resizable = gtk_window_get_resizable (window);
+      deletable = gtk_window_get_deletable (window);
+    }
+  else
+    {
+      is_sovereign_window = TRUE;
+      maximized = FALSE;
+      resizable = TRUE;
+      deletable = TRUE;
+    }
+
+  layout = get_layout (self);
+
+  if (!layout)
+    {      set_empty (self, TRUE);
+
+
+      return;
+    }
+
+  tokens = g_strsplit (layout, ",", -1);
+
+  for (i = 0; tokens[i]; i++)
+    {
+      GtkWidget *button = NULL;
+      GtkWidget *image = NULL;
+      AtkObject *accessible;
+
+      if (strcmp (tokens[i], "icon") == 0 &&
+          is_sovereign_window)
+        {
+          button = gtk_image_new ();
+          gtk_widget_set_valign (button, GTK_ALIGN_CENTER);
+          gtk_widget_add_css_class (button, "icon");
+
+          if (!update_window_icon (window, button))
+            {
+              g_object_ref_sink (button);
+              g_object_unref (button);
+              button = NULL;
+            }
+        }
+      else if (strcmp (tokens[i], "minimize") == 0 &&
+               is_sovereign_window)
+        {
+          button = gtk_button_new ();
+          gtk_widget_set_valign (button, GTK_ALIGN_CENTER);
+          gtk_widget_add_css_class (button, "minimize");
+          image = gtk_image_new_from_icon_name ("window-minimize-symbolic");
+          g_object_set (image, "use-fallback", TRUE, NULL);
+          gtk_container_add (GTK_CONTAINER (button), image);
+          gtk_widget_set_can_focus (button, FALSE);
+          gtk_actionable_set_action_name (GTK_ACTIONABLE (button),
+                                          "window.minimize");
+
+          accessible = gtk_widget_get_accessible (button);
+          if (GTK_IS_ACCESSIBLE (accessible))
+            atk_object_set_name (accessible, _("Minimize"));
+        }
+      else if (strcmp (tokens[i], "maximize") == 0 &&
+               resizable &&
+               is_sovereign_window)
+        {
+          const char *icon_name;
+
+          icon_name = maximized ? "window-restore-symbolic" : "window-maximize-symbolic";
+          button = gtk_button_new ();
+          gtk_widget_set_valign (button, GTK_ALIGN_CENTER);
+          gtk_widget_add_css_class (button, "maximize");
+          image = gtk_image_new_from_icon_name (icon_name);
+          g_object_set (image, "use-fallback", TRUE, NULL);
+          gtk_container_add (GTK_CONTAINER (button), image);
+          gtk_widget_set_can_focus (button, FALSE);
+          gtk_actionable_set_action_name (GTK_ACTIONABLE (button),
+                                          "window.toggle-maximized");
+
+          accessible = gtk_widget_get_accessible (button);
+          if (GTK_IS_ACCESSIBLE (accessible))
+            atk_object_set_name (accessible, maximized ? _("Restore") : _("Maximize"));
+        }
+      else if (strcmp (tokens[i], "close") == 0 &&
+               deletable)
+        {
+          button = gtk_button_new ();
+          gtk_widget_set_valign (button, GTK_ALIGN_CENTER);
+          image = gtk_image_new_from_icon_name ("window-close-symbolic");
+          gtk_widget_add_css_class (button, "close");
+          g_object_set (image, "use-fallback", TRUE, NULL);
+          gtk_container_add (GTK_CONTAINER (button), image);
+          gtk_widget_set_can_focus (button, FALSE);
+          gtk_actionable_set_action_name (GTK_ACTIONABLE (button),
+                                          "window.close");
+
+          accessible = gtk_widget_get_accessible (button);
+          if (GTK_IS_ACCESSIBLE (accessible))
+            atk_object_set_name (accessible, _("Close"));
+        }
+
+      if (button)
+        {
+          gtk_widget_set_parent (button, widget);
+          empty = FALSE;
+        }
+    }
+  g_free (layout);
+  g_strfreev (tokens);
+
+  set_empty (self, empty);
+}
+
+static void
+window_notify_cb (GtkWindowControls *self,
+                  GParamSpec        *pspec,
+                  GtkWindow         *window)
+{
+  if (pspec->name == I_("deletable") ||
+      pspec->name == I_("icon-name") ||
+      pspec->name == I_("is-maximized") ||
+      pspec->name == I_("modal") ||
+      pspec->name == I_("resizable") ||
+      pspec->name == I_("transient-for"))
+    update_window_buttons (self);
+}
+
+static void
+gtk_window_controls_root (GtkWidget *widget)
+{
+  GtkSettings *settings;
+  GtkWidget *root;
+
+  GTK_WIDGET_CLASS (gtk_window_controls_parent_class)->root (widget);
+
+  settings = gtk_widget_get_settings (widget);
+  g_signal_connect_swapped (settings, "notify::gtk-decoration-layout",
+                            G_CALLBACK (update_window_buttons), widget);
+
+  root = GTK_WIDGET (gtk_widget_get_root (widget));
+
+  if (GTK_IS_WINDOW (root))
+    g_signal_connect_swapped (root, "notify",
+                              G_CALLBACK (window_notify_cb), widget);
+
+  update_window_buttons (GTK_WINDOW_CONTROLS (widget));
+}
+
+static void
+gtk_window_controls_unroot (GtkWidget *widget)
+{
+  GtkSettings *settings;
+
+  settings = gtk_widget_get_settings (widget);
+
+  g_signal_handlers_disconnect_by_func (settings, update_window_buttons, widget);
+  g_signal_handlers_disconnect_by_func (gtk_widget_get_root (widget), window_notify_cb, widget);
+
+  GTK_WIDGET_CLASS (gtk_window_controls_parent_class)->unroot (widget);
+}
+
+static void
+gtk_window_controls_finalize (GObject *object)
+{
+  GtkWindowControls *self = GTK_WINDOW_CONTROLS (object);
+
+  clear_controls (self);
+
+  g_free (self->decoration_layout);
+
+  G_OBJECT_CLASS (gtk_window_controls_parent_class)->finalize (object);
+}
+
+static void
+gtk_window_controls_get_property (GObject    *object,
+                                  guint       prop_id,
+                                  GValue     *value,
+                                  GParamSpec *pspec)
+{
+  GtkWindowControls *self = GTK_WINDOW_CONTROLS (object);
+
+  switch (prop_id)
+    {
+    case PROP_PACK_TYPE:
+      g_value_set_enum (value, gtk_window_controls_get_pack_type (self));
+      break;
+
+    case PROP_DECORATION_LAYOUT:
+      g_value_set_string (value, gtk_window_controls_get_decoration_layout (self));
+      break;
+
+    case PROP_EMPTY:
+      g_value_set_boolean (value, gtk_window_controls_get_empty (self));
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+    }
+}
+
+static void
+gtk_window_controls_set_property (GObject      *object,
+                                  guint         prop_id,
+                                  const GValue *value,
+                                  GParamSpec   *pspec)
+{
+  GtkWindowControls *self = GTK_WINDOW_CONTROLS (object);
+
+  switch (prop_id)
+    {
+    case PROP_PACK_TYPE:
+      gtk_window_controls_set_pack_type (self, g_value_get_enum (value));
+      break;
+
+    case PROP_DECORATION_LAYOUT:
+      gtk_window_controls_set_decoration_layout (self, g_value_get_string (value));
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+    }
+}
+
+static void
+gtk_window_controls_class_init (GtkWindowControlsClass *klass)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
+
+  object_class->finalize = gtk_window_controls_finalize;
+  object_class->get_property = gtk_window_controls_get_property;
+  object_class->set_property = gtk_window_controls_set_property;
+
+  widget_class->root = gtk_window_controls_root;
+  widget_class->unroot = gtk_window_controls_unroot;
+
+  /**
+   * GtkWindowControls:pack-type:
+   *
+   * Whether the widget shows start or end portion of the decoration layout.
+   *
+   * See gtk_window_controls_set_decoration_layout().
+   */
+  props[PROP_PACK_TYPE] =
+      g_param_spec_enum ("pack-type",
+                         P_("Pack type"),
+                         P_("Whether the widget shows start or end portion of the decoration layout"),
+                         GTK_TYPE_PACK_TYPE,
+                         GTK_PACK_START,
+                         GTK_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY);
+
+  /**
+   * GtkWindowControls:decoration-layout:
+   *
+   * The decoration layout for window buttons. If this property is not set,
+   * the #GtkSettings:gtk-decoration-layout setting is used.
+   *
+   * See gtk_window_controls_set_decoration_layout() for information
+   * about the format of this string.
+   */
+  props[PROP_DECORATION_LAYOUT] =
+      g_param_spec_string ("decoration-layout",
+                           P_("Decoration Layout"),
+                           P_("The layout for window decorations"),
+                           NULL,
+                           GTK_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY);
+
+  /**
+   * GtkWindowControls:empty:
+   *
+   * Whether the widget has any window buttons.
+   */
+  props[PROP_EMPTY] =
+    g_param_spec_boolean ("empty",
+                          P_("Empty"),
+                          P_("Whether the widget has any window buttons"),
+                          TRUE,
+                          GTK_PARAM_READABLE | G_PARAM_EXPLICIT_NOTIFY);
+
+  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_css_name (widget_class, I_("windowcontrols"));
+}
+
+static void
+gtk_window_controls_init (GtkWindowControls *self)
+{
+  self->decoration_layout = NULL;
+  self->pack_type = GTK_PACK_START;
+  self->empty = TRUE;
+
+  gtk_widget_add_css_class (GTK_WIDGET (self), "empty");
+  gtk_widget_add_css_class (GTK_WIDGET (self), "start");
+
+  gtk_widget_set_can_focus (GTK_WIDGET (self), FALSE);
+}
+
+/**
+ * gtk_window_controls_new:
+ * @pack_type: the pack type
+ *
+ * Creates a new #GtkWindowControls.
+ *
+ * Returns: a new #GtkWindowControls.
+ **/
+GtkWidget *
+gtk_window_controls_new (GtkPackType pack_type)
+{
+  return g_object_new (GTK_TYPE_WINDOW_CONTROLS,
+                       "pack-type", pack_type,
+                       NULL);
+}
+
+/**
+ * gtk_window_controls_get_pack_type:
+ * @self: a #GtkWindowControls
+ *
+ * Gets the pack type set with gtk_window_controls_set_pack_type().
+ *
+ * Returns: the pack type
+ */
+GtkPackType
+gtk_window_controls_get_pack_type (GtkWindowControls *self)
+{
+  g_return_val_if_fail (GTK_IS_WINDOW_CONTROLS (self), GTK_PACK_START);
+
+  return self->pack_type;
+}
+
+/**
+ * gtk_window_controls_set_pack_type:
+ * @self: a #GtkWindowControls
+ * @pack_type: a pack type
+ *
+ * Sets the pack type for @self. @GTK_PACK_START means using
+ *
+ * See gtk_window_controls_set_decoration_layout()
+ */
+void
+gtk_window_controls_set_pack_type (GtkWindowControls *self,
+                                   GtkPackType        pack_type)
+{
+  g_return_if_fail (GTK_IS_WINDOW_CONTROLS (self));
+
+  if (self->pack_type == pack_type)
+    return;
+
+  self->pack_type = pack_type;
+
+  switch (pack_type)
+    {
+    case GTK_PACK_START:
+      gtk_widget_add_css_class (GTK_WIDGET (self), "start");
+      gtk_widget_remove_css_class (GTK_WIDGET (self), "end");
+      break;
+
+    case GTK_PACK_END:
+      gtk_widget_add_css_class (GTK_WIDGET (self), "end");
+      gtk_widget_remove_css_class (GTK_WIDGET (self), "start");
+      break;
+
+    default:
+      g_warning ("Unexpected pack type: %d", pack_type);
+      break;
+    }
+
+  update_window_buttons (self);
+
+  g_object_notify_by_pspec (G_OBJECT (self), props[PROP_PACK_TYPE]);
+}
+
+/**
+ * gtk_window_controls_get_decoration_layout:
+ * @self: a #GtkWindowControls
+ *
+ * Gets the decoration layout set with
+ * gtk_window_controls_set_decoration_layout().
+ *
+ * Returns: the decoration layout
+ */
+const char *
+gtk_window_controls_get_decoration_layout (GtkWindowControls *self)
+{
+  g_return_val_if_fail (GTK_IS_WINDOW_CONTROLS (self), NULL);
+
+  return self->decoration_layout;
+}
+
+/**
+ * gtk_window_controls_set_decoration_layout:
+ * @self: a #GtkWindowControls
+ * @layout: (allow-none): a decoration layout, or %NULL to
+ *     unset the layout
+ *
+ * Sets the decoration layout for the title buttons, overriding
+ * the #GtkSettings:gtk-decoration-layout setting.
+ *
+ * The format of the string is button names, separated by commas.
+ * A colon separates the buttons that should appear on the left
+ * from those on the right. Recognized button names are minimize,
+ * maximize, close and icon (the window icon).
+ *
+ * For example, “icon:minimize,maximize,close” specifies a icon
+ * on the left, and minimize, maximize and close buttons on the right.
+ *
+ * If #GtkWindowControls:pack-type value is @GTK_PACK_START, @self will
+ * display the part before the colon, otherwise after that.
+ */
+void
+gtk_window_controls_set_decoration_layout (GtkWindowControls *self,
+                                           const char        *layout)
+{
+  g_return_if_fail (GTK_IS_WINDOW_CONTROLS (self));
+
+  g_free (self->decoration_layout);
+  self->decoration_layout = g_strdup (layout);
+
+  update_window_buttons (self);
+
+  g_object_notify_by_pspec (G_OBJECT (self), props[PROP_DECORATION_LAYOUT]);
+}
+
+/**
+ * gtk_window_controls_get_empty:
+ * @self: a #GtkWindowControls
+ *
+ * Gets whether the widget has any window buttons.
+ *
+ * Returns: %TRUE if the widget has window buttons, otherwise %FALSE
+ */
+gboolean
+gtk_window_controls_get_empty (GtkWindowControls *self)
+{
+  g_return_val_if_fail (GTK_IS_WINDOW_CONTROLS (self), FALSE);
+
+  return self->empty;
+}
diff --git a/gtk/gtkwindowcontrols.h b/gtk/gtkwindowcontrols.h
new file mode 100644
index 0000000000..e3cd9a93e8
--- /dev/null
+++ b/gtk/gtkwindowcontrols.h
@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2020 Alexander Mikhaylenko <alexm gnome org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+ * License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#pragma once
+
+#if !defined (__GTK_H_INSIDE__) && !defined (GTK_COMPILATION)
+#error "Only <gtk/gtk.h> can be included directly."
+#endif
+
+#include <gtk/gtkwidget.h>
+
+G_BEGIN_DECLS
+
+#define GTK_TYPE_WINDOW_CONTROLS (gtk_window_controls_get_type ())
+
+GDK_AVAILABLE_IN_ALL
+G_DECLARE_FINAL_TYPE (GtkWindowControls, gtk_window_controls, GTK, WINDOW_CONTROLS, GtkWidget)
+
+GDK_AVAILABLE_IN_ALL
+GtkWidget *  gtk_window_controls_new                   (GtkPackType        pack_type);
+
+GDK_AVAILABLE_IN_ALL
+GtkPackType  gtk_window_controls_get_pack_type         (GtkWindowControls *self);
+
+GDK_AVAILABLE_IN_ALL
+void         gtk_window_controls_set_pack_type         (GtkWindowControls *self,
+                                                        GtkPackType        pack_type);
+
+GDK_AVAILABLE_IN_ALL
+const char * gtk_window_controls_get_decoration_layout (GtkWindowControls *self);
+
+GDK_AVAILABLE_IN_ALL
+void         gtk_window_controls_set_decoration_layout (GtkWindowControls *self,
+                                                        const char        *layout);
+
+GDK_AVAILABLE_IN_ALL
+gboolean     gtk_window_controls_get_empty             (GtkWindowControls *self);
+
+G_END_DECLS
diff --git a/gtk/meson.build b/gtk/meson.build
index e78375df7e..108fa2826e 100644
--- a/gtk/meson.build
+++ b/gtk/meson.build
@@ -390,6 +390,7 @@ gtk_public_sources = files([
   'gtkwidgetfocus.c',
   'gtkwidgetpaintable.c',
   'gtkwindow.c',
+  'gtkwindowcontrols.c',
   'gtkwindowgroup.c',
 ])
 
@@ -620,6 +621,7 @@ gtk_public_headers = files([
   'gtkwidget.h',
   'gtkwidgetpaintable.h',
   'gtkwindow.h',
+  'gtkwindowcontrols.h',
   'gtkwindowgroup.h',
   'gtk-a11y.h',
   'gtk-autocleanups.h',
diff --git a/gtk/theme/Adwaita/_common.scss b/gtk/theme/Adwaita/_common.scss
index fdc84820b8..61b213a044 100644
--- a/gtk/theme/Adwaita/_common.scss
+++ b/gtk/theme/Adwaita/_common.scss
@@ -1418,6 +1418,41 @@ searchbar {
 }
 
 
+/*****************
+ * Title buttons *
+ *****************/
+
+windowcontrols {
+  border-spacing: 6px;
+
+  &.start:dir(ltr),
+  &.end:dir(rtl) {
+    margin-right: 7px;
+  }
+
+  &.start:dir(rtl),
+  &.end:dir(ltr) {
+    margin-left: 7px;
+  }
+
+  button {
+    @extend %button_basic;
+
+    @extend %button_basic_flat;
+
+    &:not(.menu) {
+      border-radius: 9999px;
+      padding: 6px;
+      margin: 0 2px;
+      min-width: 0;
+      min-height: 0;
+    }
+
+    &:backdrop { -gtk-icon-shadow: none; }
+  }
+}
+
+
 /***************
  * Header bars *
  ***************/
@@ -1489,19 +1524,21 @@ headerbar {
     min-height: 28px;
     padding: 4px;
 
-    button.titlebutton,
-    menubutton.titlebutton {
-      min-height: 26px;
-      min-width: 26px;
-      margin: 0;
-      padding: 0;
-    }
+    windowcontrols {
+      button,
+      menubutton {
+        min-height: 26px;
+        min-width: 26px;
+        margin: 0;
+        padding: 0;
+      }
 
-    menubutton.titlebutton button {
-      min-height: 20px;
-      min-width: 20px;
-      margin: 0;
-      padding: 4px;
+      menubutton button {
+        min-height: 20px;
+        min-width: 20px;
+        margin: 0;
+        padding: 4px;
+      }
     }
   }
 
@@ -4114,24 +4151,6 @@ decoration {
   }
 }
 
-// Window Close button
-button.titlebutton {
-  @extend %button_basic;
-
-  @extend %button_basic_flat;
-
-
-  &:not(.menu) {
-    border-radius: 9999px;
-    padding: 6px;
-    margin: 0 2px;
-    min-width: 0;
-    min-height: 0;
-  }
-
-  &:backdrop { -gtk-icon-shadow: none; }
-}
-
 // catch all extend :)
 
 %selected_items {


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