[libadwaita/wip/exalm/dark: 1/3] Add AdwStyleManager




commit ce063dbef151353cb6e3858eb3582565e105453a
Author: Alexander Mikhaylenko <exalm7659 gmail com>
Date:   Thu Aug 26 14:21:34 2021 +0500

    Add AdwStyleManager
    
    Move the stylesheet handling from adw-main.c there. Provide API for
    influencing and inspecting color scheme.

 src/adw-enums.c.in              |   1 +
 src/adw-main.c                  | 108 +------
 src/adw-style-manager-private.h |  21 ++
 src/adw-style-manager.c         | 675 ++++++++++++++++++++++++++++++++++++++++
 src/adw-style-manager.h         |  57 ++++
 src/adwaita.h                   |   1 +
 src/meson.build                 |   3 +
 7 files changed, 766 insertions(+), 100 deletions(-)
---
diff --git a/src/adw-enums.c.in b/src/adw-enums.c.in
index 238a7283..b151b1ed 100644
--- a/src/adw-enums.c.in
+++ b/src/adw-enums.c.in
@@ -8,6 +8,7 @@
 #include "adw-leaflet.h"
 #include "adw-navigation-direction.h"
 #include "adw-squeezer.h"
+#include "adw-style-manager.h"
 #include "adw-view-switcher.h"
 
 /*** END file-header ***/
diff --git a/src/adw-main.c b/src/adw-main.c
index afad88e0..0c1273a5 100644
--- a/src/adw-main.c
+++ b/src/adw-main.c
@@ -1,112 +1,18 @@
 /*
- * Copyright (C) 2018-2020 Purism SPC
+ * Copyright (C) 2018-2021 Purism SPC
  *
  * SPDX-License-Identifier: LGPL-2.1-or-later
  */
 #include "config.h"
+
 #include "adw-main-private.h"
-#include <gio/gio.h>
+
+#include "adw-style-manager-private.h"
 #include <glib/gi18n-lib.h>
 #include <gtk/gtk.h>
 
 static int adw_initialized = FALSE;
 
-static gboolean
-is_high_contrast (void)
-{
-  GdkDisplay *display = gdk_display_get_default ();
-  g_auto (GValue) value = G_VALUE_INIT;
-  const char *theme_name;
-
-  g_value_init (&value, G_TYPE_STRING);
-  if (!gdk_display_get_setting (display, "gtk-theme-name", &value))
-    return FALSE;
-
-  theme_name = g_value_get_string (&value);
-
-  /* TODO: HighContrast shouldn't be a theme */
-  return !g_strcmp0 (theme_name, "HighContrast") ||
-         !g_strcmp0 (theme_name, "HighContrastInverse");
-}
-
-static void
-update_theme (void)
-{
-  GtkSettings *settings = gtk_settings_get_default ();
-  g_autofree char *new_theme_name = NULL;
-  gboolean prefer_dark_theme;
-  const char *variant;
-
-  g_object_get (settings,
-                "gtk-application-prefer-dark-theme", &prefer_dark_theme,
-                NULL);
-
-  if (is_high_contrast ())
-    variant = prefer_dark_theme ? "hc-dark" : "hc";
-  else
-    variant = prefer_dark_theme ? "dark" : "light";
-
-  new_theme_name = g_strdup_printf ("Adwaita-%s", variant);
-
-  g_object_set (settings, "gtk-theme-name", new_theme_name, NULL);
-}
-
-static void
-setting_changed_cb (GdkDisplay *display,
-                    const char *setting)
-{
-  if (!g_strcmp0 (setting, "gtk-theme-name"))
-    update_theme ();
-}
-
-static void
-adw_style_init (void)
-{
-  static gsize guard = 0;
-  GtkSettings *settings;
-
-  if (!g_once_init_enter (&guard))
-    return;
-
-  settings = gtk_settings_get_default ();
-
-  if (!settings) {
-    g_once_init_leave (&guard, 1);
-
-    return;
-  }
-
-  g_signal_connect (settings,
-                    "notify::gtk-application-prefer-dark-theme",
-                    G_CALLBACK (update_theme),
-                    NULL);
-
-  /* If gtk_settings_get_default() has worked, GdkDisplay
-   * exists, so we don't need to check that separately. */
-  g_signal_connect (gdk_display_get_default (),
-                    "setting-changed",
-                    G_CALLBACK (setting_changed_cb),
-                    NULL);
-
-  update_theme ();
-
-  g_once_init_leave (&guard, 1);
-}
-
-static void
-adw_icons_init (void)
-{
-  static gsize guard = 0;
-
-  if (!g_once_init_enter (&guard))
-    return;
-
-  gtk_icon_theme_add_resource_path (gtk_icon_theme_get_for_display (gdk_display_get_default ()),
-                                    "/org/gnome/Adwaita/icons");
-
-  g_once_init_leave (&guard, 1);
-}
-
 /**
  * adw_init:
  *
@@ -134,8 +40,10 @@ adw_init (void)
   bindtextdomain (GETTEXT_PACKAGE, LOCALEDIR);
   adw_init_public_types ();
 
-  adw_style_init ();
-  adw_icons_init ();
+  gtk_icon_theme_add_resource_path (gtk_icon_theme_get_for_display (gdk_display_get_default ()),
+                                    "/org/gnome/Adwaita/icons");
+
+  adw_style_manager_ensure ();
 
   adw_initialized = TRUE;
 }
diff --git a/src/adw-style-manager-private.h b/src/adw-style-manager-private.h
new file mode 100644
index 00000000..6e435b98
--- /dev/null
+++ b/src/adw-style-manager-private.h
@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2021 Purism SPC
+ *
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ *
+ * Author: Alexander Mikhaylenko <alexander mikhaylenko puri sm>
+ */
+
+#pragma once
+
+#if !defined(_ADWAITA_INSIDE) && !defined(ADWAITA_COMPILATION)
+#error "Only <adwaita.h> can be included directly."
+#endif
+
+#include "adw-style-manager.h"
+
+G_BEGIN_DECLS
+
+void adw_style_manager_ensure (void);
+
+G_END_DECLS
diff --git a/src/adw-style-manager.c b/src/adw-style-manager.c
new file mode 100644
index 00000000..a077156e
--- /dev/null
+++ b/src/adw-style-manager.c
@@ -0,0 +1,675 @@
+/*
+ * Copyright (C) 2021 Purism SPC
+ *
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ *
+ * Author: Alexander Mikhaylenko <alexander mikhaylenko puri sm>
+ */
+
+#include "config.h"
+
+#include "adw-style-manager-private.h"
+
+#include "adw-settings-private.h"
+#include <gtk/gtk.h>
+
+#define SWITCH_DURATION 250
+
+/**
+ * AdwColorScheme:
+ * @ADW_COLOR_SCHEME_DEFAULT: Inherit the parent color-scheme. When set on the
+ *   `AdwStyleManager` returned by [func@Adw.StyleManager.get_default], it's
+ *   equivalent to `ADW_COLOR_SCHEME_LIGHT_DARK`.
+ * @ADW_COLOR_SCHEME_LIGHT: Always use light appearance.
+ * @ADW_COLOR_SCHEME_LIGHT_DARK: Use light appearance unless the system prefers
+ *   dark colors.
+ * @ADW_COLOR_SCHEME_DARK_LIGHT: Use dark appearance unless the system prefers
+ *   light colors.
+ * @ADW_COLOR_SCHEME_DARK: Always use dark appearance.
+ *
+ * Application color schemes for [property@Adw.StyleManager:color-scheme].
+ *
+ * Since: 1.0
+ */
+
+/**
+ * AdwStyleManager:
+ *
+ * A class for managing application-wide styling.
+ *
+ * `AdwStyleManager` provides a way to query and influence the application
+ * styles, such as whether to use dark or high contrast appearance.
+ *
+ * It allows to set the color scheme via the
+ * [property@Adw.StyleManager:color-scheme] property, and to query the current
+ * appearance, as well as whether a system-wide color scheme preference exists.
+ *
+ * Since: 1.0
+ */
+
+struct _AdwStyleManager
+{
+  GObject parent_instance;
+
+  GdkDisplay *display;
+  AdwSettings *settings;
+
+  AdwColorScheme color_scheme;
+  gboolean dark;
+
+  guint animation_timeout_id;
+};
+
+G_DEFINE_TYPE (AdwStyleManager, adw_style_manager, G_TYPE_OBJECT);
+
+enum {
+  PROP_0,
+  PROP_DISPLAY,
+  PROP_COLOR_SCHEME,
+  PROP_SYSTEM_SUPPORTS_COLOR_SCHEMES,
+  PROP_DARK,
+  PROP_HIGH_CONTRAST,
+  LAST_PROP,
+};
+
+static GParamSpec *props[LAST_PROP];
+
+static GHashTable *display_style_managers = NULL;
+static AdwStyleManager *default_instance = NULL;
+
+static void
+warn_prefer_dark_theme (void)
+{
+  g_warning ("Using GtkSettings:gtk-application-prefer-dark-theme with "
+             "libadwaita is unsupported. Please use "
+             "AdwStyleManager:color-scheme or AdwApplication:color-scheme "
+             "instead.");
+}
+
+static void
+unregister_display (GdkDisplay *display)
+{
+  g_assert (!g_hash_table_contains (display_style_managers, display));
+
+  g_hash_table_remove (display_style_managers, display);
+}
+
+static void
+register_display (GdkDisplayManager *display_manager,
+                  GdkDisplay        *display)
+{
+  AdwStyleManager *style_manager;
+
+  style_manager = g_object_new (ADW_TYPE_STYLE_MANAGER,
+                                "display", display,
+                                NULL);
+
+  g_assert (!g_hash_table_contains (display_style_managers, display));
+
+  g_hash_table_insert (display_style_managers, display, style_manager);
+
+  g_signal_connect (display,
+                    "closed",
+                    G_CALLBACK (unregister_display),
+                    NULL);
+}
+
+static gboolean
+enable_animations_cb (AdwStyleManager *self)
+{
+  g_object_set (gtk_settings_get_for_display (self->display),
+                "gtk-enable-animations", TRUE,
+                NULL);
+
+  self->animation_timeout_id = 0;
+
+  return G_SOURCE_REMOVE;
+}
+
+static void
+update_stylesheet (AdwStyleManager *self)
+{
+  const char *variant;
+  g_autofree char *new_theme_name = NULL;
+  GtkSettings *gtk_settings;
+  gboolean enable_animations;
+
+  if (!self->display)
+    return;
+
+  gtk_settings = gtk_settings_get_for_display (self->display);
+
+  if (adw_settings_get_high_contrast (self->settings))
+    variant = self->dark ? "hc-dark" : "hc";
+  else
+    variant = self->dark ? "dark" : "light";
+
+  new_theme_name = g_strdup_printf ("Adwaita-%s", variant);
+
+  if (self->animation_timeout_id) {
+    g_clear_handle_id (&self->animation_timeout_id, g_source_remove);
+    enable_animations = TRUE;
+  } else {
+    g_object_get (gtk_settings,
+                  "gtk-enable-animations", &enable_animations,
+                  NULL);
+  }
+
+  g_object_set (gtk_settings,
+                "gtk-enable-animations", FALSE,
+                "gtk-theme-name", new_theme_name,
+                NULL);
+
+  if (enable_animations) {
+    self->animation_timeout_id =
+      g_timeout_add (SWITCH_DURATION,
+                     G_SOURCE_FUNC (enable_animations_cb),
+                     self);
+  }
+}
+
+static gboolean
+get_is_dark (AdwStyleManager *self)
+{
+  AdwSystemColorScheme system_scheme = adw_settings_get_color_scheme (self->settings);
+
+  switch (self->color_scheme) {
+  case ADW_COLOR_SCHEME_DEFAULT:
+    if (self->display)
+      return get_is_dark (default_instance);
+    return (system_scheme == ADW_SYSTEM_COLOR_SCHEME_PREFER_DARK);
+  case ADW_COLOR_SCHEME_LIGHT:
+    return FALSE;
+  case ADW_COLOR_SCHEME_LIGHT_DARK:
+    return (system_scheme == ADW_SYSTEM_COLOR_SCHEME_PREFER_DARK);
+  case ADW_COLOR_SCHEME_DARK_LIGHT:
+    return (system_scheme == ADW_SYSTEM_COLOR_SCHEME_PREFER_DARK) ||
+           (system_scheme == ADW_SYSTEM_COLOR_SCHEME_DEFAULT);
+  case ADW_COLOR_SCHEME_DARK:
+    return TRUE;
+  default:
+    g_assert_not_reached ();
+  }
+}
+
+static void
+update_dark (AdwStyleManager *self)
+{
+  gboolean dark = get_is_dark (self);
+
+  if (dark == self->dark)
+    return;
+
+  self->dark = dark;
+
+  update_stylesheet (self);
+
+  g_object_notify_by_pspec (G_OBJECT (self), props[PROP_DARK]);
+}
+
+static void
+notify_high_contrast_cb (AdwStyleManager *self)
+{
+  update_stylesheet (self);
+
+  g_object_notify_by_pspec (G_OBJECT (self), props[PROP_HIGH_CONTRAST]);
+}
+
+static void
+adw_style_manager_constructed (GObject *object)
+{
+  AdwStyleManager *self = ADW_STYLE_MANAGER (object);
+
+  G_OBJECT_CLASS (adw_style_manager_parent_class)->constructed (object);
+
+  if (self->display) {
+    GtkSettings *settings = gtk_settings_get_for_display (self->display);
+    gboolean prefer_dark_theme;
+
+    g_object_get (settings,
+                  "gtk-application-prefer-dark-theme", &prefer_dark_theme,
+                  NULL);
+
+    if (prefer_dark_theme)
+      warn_prefer_dark_theme ();
+
+    g_signal_connect_object (settings,
+                             "notify::gtk-application-prefer-dark-theme",
+                             G_CALLBACK (warn_prefer_dark_theme),
+                             self,
+                             0);
+  }
+
+  self->settings = adw_settings_get_default ();
+
+  g_signal_connect_object (self->settings,
+                           "notify::color-scheme",
+                           G_CALLBACK (update_dark),
+                           self,
+                           G_CONNECT_SWAPPED);
+  g_signal_connect_object (self->settings,
+                           "notify::high-contrast",
+                           G_CALLBACK (notify_high_contrast_cb),
+                           self,
+                           G_CONNECT_SWAPPED);
+
+  update_dark (self);
+  update_stylesheet (self);
+}
+
+static void
+adw_style_manager_dispose (GObject *object)
+{
+  AdwStyleManager *self = ADW_STYLE_MANAGER (object);
+
+  g_clear_handle_id (&self->animation_timeout_id, g_source_remove);
+
+  G_OBJECT_CLASS (adw_style_manager_parent_class)->dispose (object);
+}
+
+static void
+adw_style_manager_get_property (GObject    *object,
+                                guint       prop_id,
+                                GValue     *value,
+                                GParamSpec *pspec)
+{
+  AdwStyleManager *self = ADW_STYLE_MANAGER (object);
+
+  switch (prop_id) {
+  case PROP_DISPLAY:
+    g_value_set_object (value, adw_style_manager_get_display (self));
+    break;
+
+  case PROP_COLOR_SCHEME:
+    g_value_set_enum (value, adw_style_manager_get_color_scheme (self));
+    break;
+
+  case PROP_SYSTEM_SUPPORTS_COLOR_SCHEMES:
+    g_value_set_boolean (value, adw_style_manager_get_system_supports_color_schemes (self));
+    break;
+
+  case PROP_DARK:
+    g_value_set_boolean (value, adw_style_manager_get_dark (self));
+    break;
+
+  case PROP_HIGH_CONTRAST:
+    g_value_set_boolean (value, adw_style_manager_get_high_contrast (self));
+    break;
+
+  default:
+    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+  }
+}
+
+static void
+adw_style_manager_set_property (GObject      *object,
+                                guint         prop_id,
+                                const GValue *value,
+                                GParamSpec   *pspec)
+{
+  AdwStyleManager *self = ADW_STYLE_MANAGER (object);
+
+  switch (prop_id) {
+  case PROP_DISPLAY:
+    self->display = g_value_get_object (value);
+    break;
+
+  case PROP_COLOR_SCHEME:
+    adw_style_manager_set_color_scheme (self, g_value_get_enum (value));
+    break;
+
+  default:
+    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+  }
+}
+
+static void
+adw_style_manager_class_init (AdwStyleManagerClass *klass)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+  object_class->constructed = adw_style_manager_constructed;
+  object_class->dispose = adw_style_manager_dispose;
+  object_class->get_property = adw_style_manager_get_property;
+  object_class->set_property = adw_style_manager_set_property;
+
+  /**
+   * AdwStyleManager:display: (attributes org.gtk.Property.get=adw_style_manager_get_display)
+   *
+   * The display the style manager is associated with.
+   *
+   * The display will be `NULL` for the style manager returned by
+   * [func@Adw.StyleManager.get_default].
+   *
+   * Since: 1.0
+   */
+  props[PROP_DISPLAY] =
+    g_param_spec_object ("display",
+                         "Display",
+                         "The display the style manager is associated with",
+                         GDK_TYPE_DISPLAY,
+                         G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY);
+
+  /**
+   * AdwStyleManager:color-scheme: (attributes org.gtk.Property.get=adw_style_manager_get_color_scheme 
org.gtk.Property.set=adw_style_manager_set_color_scheme)
+   *
+   * The requested application color scheme.
+   *
+   * The effective appearance will be decided based on the application color
+   * scheme and the system preferred color scheme. The
+   * [property@Adw.StyleManager:dark] property can be used to query the
+   * current effective appearance.
+   *
+   * The `ADW_COLOR_SCHEME_LIGHT_DARK` color scheme results in the application
+   * using light appearance unless the system prefers dark colors. This is the
+   * default value.
+   *
+   * The `ADW_COLOR_SCHEME_DARK` color scheme results in the application
+   * using dark appearance, but can still switch to the light appearance if the
+   * system can prefers it, for example, when the high contrast preference is
+   * enabled.
+   *
+   * The `ADW_COLOR_SCHEME_LIGHT` and `ADW_COLOR_SCHEME_DARK` values ignore the
+   * system preference entirely, they are useful if the application wants to
+   * match its UI to its content or to provide a separate color scheme switcher.
+   *
+   * If a per-[class@Gdk.Display] style manager has its color scheme set to
+   * `ADW_COLOR_SCHEME_DEFAULT`, it will inherit the color scheme from the
+   * default style manager.
+   *
+   * For the default style manager, `ADW_COLOR_SCHEME_DEFAULT` is equivalent to
+   * `ADW_COLOR_SCHEME_LIGHT_DARK`.
+   *
+   * The [property@Adw.StyleManager:system-supports-color-schemes] property can
+   * be used to check if the current environment provides a color scheme
+   * preference.
+   *
+   * Since: 1.0
+   */
+  props[PROP_COLOR_SCHEME] =
+    g_param_spec_enum ("color-scheme",
+                       "Color Scheme",
+                       "The current color scheme",
+                       ADW_TYPE_COLOR_SCHEME,
+                       ADW_COLOR_SCHEME_DEFAULT,
+                       G_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY);
+
+  /**
+   * AdwStyleManager:system-supports-color-schemes: (attributes 
org.gtk.Property.get=adw_style_manager_get_system_supports_color_schemes)
+   *
+   * Whether the system supports color schemes.
+   *
+   * This property can be used to check if the current environment provides a
+   * color scheme preference. For example, applications might want to show a
+   * separate appearance switcher if it's set to `FALSE`.
+   *
+   * It's only set at startup and cannot change its value later.
+   *
+   * See [property@Adw.StyleManager:color-scheme].
+   *
+   * Since: 1.0
+   */
+  props[PROP_SYSTEM_SUPPORTS_COLOR_SCHEMES] =
+    g_param_spec_boolean ("system-supports-color-schemes",
+                          "System supports color schemes",
+                          "Whether the system supports color schemes",
+                          FALSE,
+                          G_PARAM_READABLE);
+
+  /**
+   * AdwStyleManager:dark: (attributes org.gtk.Property.get=adw_style_manager_get_dark)
+   *
+   * Whether the application is using dark appearance.
+   *
+   * This property can be used to query the current appearance, as requested via
+   * [property@Adw.StyleManager:color-scheme].
+   *
+   * Since: 1.0
+   */
+  props[PROP_DARK] =
+    g_param_spec_boolean ("dark",
+                          "Dark",
+                          "Whether the application is using dark appearance",
+                          FALSE,
+                          G_PARAM_READABLE);
+
+  /**
+   * AdwStyleManager:high-contrast: (attributes org.gtk.Property.get=adw_style_manager_get_high_contrast)
+   *
+   * Whether the application is using high contrast appearance.
+   *
+   * This cannot be overridden by applications.
+   *
+   * Since: 1.0
+   */
+  props[PROP_HIGH_CONTRAST] =
+    g_param_spec_boolean ("high-contrast",
+                          "High Contrast",
+                          "Whether the application is using high contrast appearance",
+                          FALSE,
+                          G_PARAM_READABLE);
+
+  g_object_class_install_properties (object_class, LAST_PROP, props);
+}
+
+static void
+adw_style_manager_init (AdwStyleManager *self)
+{
+  self->color_scheme = ADW_COLOR_SCHEME_DEFAULT;
+}
+
+void
+adw_style_manager_ensure (void)
+{
+  GdkDisplayManager *display_manager = gdk_display_manager_get ();
+  g_autoptr (GSList) displays = NULL;
+  GSList *l;
+
+  if (display_style_managers)
+    return;
+
+  default_instance = g_object_new (ADW_TYPE_STYLE_MANAGER, NULL);
+  display_style_managers = g_hash_table_new_full (g_direct_hash,
+                                                  g_direct_equal,
+                                                  NULL,
+                                                  g_object_unref);
+
+  displays = gdk_display_manager_list_displays (display_manager);
+
+  for (l = displays; l; l = l->next)
+    register_display (display_manager, l->data);
+
+  g_signal_connect (display_manager,
+                    "display-opened",
+                    G_CALLBACK (register_display),
+                    NULL);
+}
+
+/**
+ * adw_style_manager_get_default:
+ *
+ * Gets the default `AdwStyleManager` instance.
+ *
+ * It manages all [class@Gdk.Display] instances unless the style manager for
+ * that display has an override.
+ *
+ * See [func@Adw.StyleManager.get_for_display].
+ *
+ * Returns: (transfer none): the default style manager
+ *
+ * Since: 1.0
+ */
+AdwStyleManager *
+adw_style_manager_get_default (void)
+{
+  if (!default_instance)
+    adw_style_manager_ensure ();
+
+  return default_instance;
+}
+
+/**
+ * adw_style_manager_get_for_display:
+ * @display: a `GdkDisplay`
+ *
+ * Gets the `AdwStyleManager` instance managing @display.
+ *
+ * It can be used to override styles for that specific display instead of the
+ * whole application.
+ *
+ * Most applications should use [func@Adw.StyleManager.get_default] instead.
+ *
+ * Returns: (transfer none): the style manager for @display
+ *
+ * Since: 1.0
+ */
+AdwStyleManager *
+adw_style_manager_get_for_display (GdkDisplay *display)
+{
+  g_return_val_if_fail (GDK_IS_DISPLAY (display), NULL);
+
+  if (!display_style_managers)
+    adw_style_manager_ensure ();
+
+  g_return_val_if_fail (g_hash_table_contains (display_style_managers, display), NULL);
+
+  return g_hash_table_lookup (display_style_managers, display);
+}
+
+/**
+ * adw_style_manager_get_display: (attributes org.gtk.Method.get_property=display)
+ * @self: a `AdwStyleManager`
+ *
+ * Gets the display the style manager is associated with.
+ *
+ * The display will be `NULL` for the style manager returned by
+ * [func@Adw.StyleManager.get_default].
+ *
+ * Returns: (transfer none): the display
+ *
+ * Since: 1.0
+ */
+GdkDisplay *
+adw_style_manager_get_display (AdwStyleManager *self)
+{
+  g_return_val_if_fail (ADW_IS_STYLE_MANAGER (self), NULL);
+
+  return self->display;
+}
+
+/**
+ * adw_style_manager_get_color_scheme: (attributes org.gtk.Method.get_property=color-scheme)
+ * @self: a `AdwStyleManager`
+ *
+ * Gets the requested application color scheme.
+ *
+ * Returns: the color scheme
+ *
+ * Since: 1.0
+ */
+AdwColorScheme
+adw_style_manager_get_color_scheme (AdwStyleManager *self)
+{
+  g_return_val_if_fail (ADW_IS_STYLE_MANAGER (self), ADW_COLOR_SCHEME_DEFAULT);
+
+  return self->color_scheme;
+}
+
+/**
+ * adw_style_manager_set_color_scheme: (attributes org.gtk.Method.set_property=color-scheme)
+ * @self: a `AdwStyleManager`
+ * @color_scheme: the color scheme
+ *
+ * Sets the requested application color scheme.
+ *
+ * The effective appearance will be decided based on the application color
+ * scheme and the system preferred color scheme. The
+ * [property@Adw.StyleManager:dark] property can be used to query the
+ * current effective appearance.
+ *
+ * Since: 1.0
+ */
+void
+adw_style_manager_set_color_scheme (AdwStyleManager *self,
+                                    AdwColorScheme   color_scheme)
+{
+  g_return_if_fail (ADW_IS_STYLE_MANAGER (self));
+
+  if (color_scheme == self->color_scheme)
+    return;
+
+  self->color_scheme = color_scheme;
+
+  g_object_freeze_notify (G_OBJECT (self));
+
+  update_dark (self);
+
+  g_object_notify_by_pspec (G_OBJECT (self), props[PROP_COLOR_SCHEME]);
+
+  g_object_thaw_notify (G_OBJECT (self));
+
+  if (!self->display) {
+    GHashTableIter iter;
+    AdwStyleManager *manager;
+
+    g_hash_table_iter_init (&iter, display_style_managers);
+
+    while (g_hash_table_iter_next (&iter, NULL, (gpointer) &manager))
+      if (manager->color_scheme == ADW_COLOR_SCHEME_DEFAULT)
+        update_dark (manager);
+  }
+}
+
+/**
+ * adw_style_manager_get_system_supports_color_schemes: (attributes 
org.gtk.Method.get_property=system-supports-color-schemes)
+ * @self: a `AdwStyleManager`
+ *
+ * Gets whether the system supports color schemes.
+ *
+ * Returns: whether the system supports color schemes
+ *
+ * Since: 1.0
+ */
+gboolean
+adw_style_manager_get_system_supports_color_schemes (AdwStyleManager *self)
+{
+  g_return_val_if_fail (ADW_IS_STYLE_MANAGER (self), FALSE);
+
+  return adw_settings_has_color_scheme (self->settings);
+}
+
+/**
+ * adw_style_manager_get_dark: (attributes org.gtk.Method.get_property=dark)
+ * @self: a `AdwStyleManager`
+ *
+ * Gets whether the application is using dark appearance.
+ *
+ * Returns: whether the application is using dark appearance
+ *
+ * Since: 1.0
+ */
+gboolean
+adw_style_manager_get_dark (AdwStyleManager *self)
+{
+  g_return_val_if_fail (ADW_IS_STYLE_MANAGER (self), FALSE);
+
+  return self->dark;
+}
+
+/**
+ * adw_style_manager_get_high_contrast: (attributes org.gtk.Method.get_property=high-contrast)
+ * @self: a `AdwStyleManager`
+ *
+ * Gets whether the application is using high contrast appearance.
+ *
+ * Returns: whether the application is using high contrast appearance
+ *
+ * Since: 1.0
+ */
+gboolean
+adw_style_manager_get_high_contrast (AdwStyleManager *self)
+{
+  g_return_val_if_fail (ADW_IS_STYLE_MANAGER (self), FALSE);
+
+  return adw_settings_get_high_contrast (self->settings);
+}
diff --git a/src/adw-style-manager.h b/src/adw-style-manager.h
new file mode 100644
index 00000000..2dc86238
--- /dev/null
+++ b/src/adw-style-manager.h
@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2021 Purism SPC
+ *
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ *
+ * Author: Alexander Mikhaylenko <alexander mikhaylenko puri sm>
+ */
+
+#pragma once
+
+#if !defined(_ADWAITA_INSIDE) && !defined(ADWAITA_COMPILATION)
+#error "Only <adwaita.h> can be included directly."
+#endif
+
+#include "adw-version.h"
+
+#include <gtk/gtk.h>
+#include "adw-enums.h"
+
+G_BEGIN_DECLS
+
+typedef enum {
+  ADW_COLOR_SCHEME_DEFAULT,
+  ADW_COLOR_SCHEME_LIGHT,
+  ADW_COLOR_SCHEME_LIGHT_DARK,
+  ADW_COLOR_SCHEME_DARK_LIGHT,
+  ADW_COLOR_SCHEME_DARK,
+} AdwColorScheme;
+
+#define ADW_TYPE_STYLE_MANAGER (adw_style_manager_get_type())
+
+ADW_AVAILABLE_IN_ALL
+G_DECLARE_FINAL_TYPE (AdwStyleManager, adw_style_manager, ADW, STYLE_MANAGER, GObject)
+
+ADW_AVAILABLE_IN_ALL
+AdwStyleManager *adw_style_manager_get_default (void);
+ADW_AVAILABLE_IN_ALL
+AdwStyleManager *adw_style_manager_get_for_display (GdkDisplay *display);
+
+ADW_AVAILABLE_IN_ALL
+GdkDisplay *adw_style_manager_get_display (AdwStyleManager *self);
+
+ADW_AVAILABLE_IN_ALL
+AdwColorScheme adw_style_manager_get_color_scheme (AdwStyleManager *self);
+ADW_AVAILABLE_IN_ALL
+void           adw_style_manager_set_color_scheme (AdwStyleManager *self,
+                                                   AdwColorScheme   color_scheme);
+
+ADW_AVAILABLE_IN_ALL
+gboolean adw_style_manager_get_system_supports_color_schemes (AdwStyleManager *self);
+
+ADW_AVAILABLE_IN_ALL
+gboolean adw_style_manager_get_dark          (AdwStyleManager *self);
+ADW_AVAILABLE_IN_ALL
+gboolean adw_style_manager_get_high_contrast (AdwStyleManager *self);
+
+G_END_DECLS
diff --git a/src/adwaita.h b/src/adwaita.h
index 2de16a19..e9fdccee 100644
--- a/src/adwaita.h
+++ b/src/adwaita.h
@@ -51,6 +51,7 @@ G_BEGIN_DECLS
 #include "adw-split-button.h"
 #include "adw-squeezer.h"
 #include "adw-status-page.h"
+#include "adw-style-manager.h"
 #include "adw-swipe-tracker.h"
 #include "adw-swipeable.h"
 #include "adw-tab-bar.h"
diff --git a/src/meson.build b/src/meson.build
index 3b44f905..71e6a5ff 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -15,6 +15,7 @@ adw_public_enum_headers = [
   'adw-header-bar.h',
   'adw-leaflet.h',
   'adw-navigation-direction.h',
+  'adw-style-manager.h',
   'adw-squeezer.h',
   'adw-tab-bar.h',
   'adw-view-switcher.h',
@@ -99,6 +100,7 @@ src_headers = [
   'adw-split-button.h',
   'adw-squeezer.h',
   'adw-status-page.h',
+  'adw-style-manager.h',
   'adw-swipe-tracker.h',
   'adw-swipeable.h',
   'adw-tab-bar.h',
@@ -158,6 +160,7 @@ src_sources = [
   'adw-shadow-helper.c',
   'adw-split-button.c',
   'adw-squeezer.c',
+  'adw-style-manager.c',
   'adw-status-page.c',
   'adw-swipe-tracker.c',
   'adw-swipeable.c',


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