[gtk/wip/otte/css: 4/7] style context: Remove parent relationship

[Benjamin Otte <otte src gnome org>]

commit 416182a20d062d5865916f86909354ec85d00dd1
Author: Timm Bäder <mail baedert org>
Date:   Mon Feb 3 10:59:21 2020 +0100

    style context: Remove parent relationship
    
    We don't have foreign drawing anymore, so we don't need this.

 gtk/gtkstylecontext.c | 95 ---------------------------------------------------
 gtk/gtkstylecontext.h |  3 --
 gtk/gtktexthandle.c   |  9 ++---
 gtk/gtkwidget.c       | 10 ------
 gtk/gtkwindow.c       |  7 ++--
 5 files changed, 6 insertions(+), 118 deletions(-)
---
diff --git a/gtk/gtkstylecontext.c b/gtk/gtkstylecontext.c
index 47e96f7ea5..d9415723cf 100644
--- a/gtk/gtkstylecontext.c
+++ b/gtk/gtkstylecontext.c
@@ -111,7 +111,6 @@ struct _GtkStyleContextPrivate
 
   guint cascade_changed_id;
   GtkStyleCascade *cascade;
-  GtkStyleContext *parent;
   GtkCssNode *cssnode;
   GSList *saved_nodes;
 };
@@ -120,7 +119,6 @@ typedef struct _GtkStyleContextPrivate GtkStyleContextPrivate;
 enum {
   PROP_0,
   PROP_DISPLAY,
-  PROP_PARENT,
   LAST_PROP
 };
 
@@ -157,19 +155,6 @@ gtk_style_context_class_init (GtkStyleContextClass *klass)
                            GDK_TYPE_DISPLAY,
                            GTK_PARAM_READWRITE);
 
-  /**
-   * GtkStyleContext:parent:
-   *
-   * Sets or gets the style context’s parent. See gtk_style_context_set_parent()
-   * for details.
-   */
-  properties[PROP_PARENT] =
-      g_param_spec_object ("parent",
-                           P_("Parent"),
-                           P_("The parent style context"),
-                           GTK_TYPE_STYLE_CONTEXT,
-                           GTK_PARAM_READWRITE);
-
   g_object_class_install_properties (object_class, LAST_PROP, properties);
 }
 
@@ -239,15 +224,6 @@ gtk_style_context_init (GtkStyleContext *context)
                                  _gtk_settings_get_style_cascade (gtk_settings_get_for_display 
(priv->display), 1));
 }
 
-static void
-gtk_style_context_clear_parent (GtkStyleContext *context)
-{
-  GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context);
-
-  if (priv->parent)
-    g_object_unref (priv->parent);
-}
-
 static void
 gtk_style_context_finalize (GObject *object)
 {
@@ -257,7 +233,6 @@ gtk_style_context_finalize (GObject *object)
   while (priv->saved_nodes)
     gtk_style_context_pop_style_node (context);
 
-  gtk_style_context_clear_parent (context);
   gtk_style_context_set_cascade (context, NULL);
 
   if (priv->cssnode)
@@ -279,9 +254,6 @@ gtk_style_context_impl_set_property (GObject      *object,
     case PROP_DISPLAY:
       gtk_style_context_set_display (context, g_value_get_object (value));
       break;
-    case PROP_PARENT:
-      gtk_style_context_set_parent (context, g_value_get_object (value));
-      break;
     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
       break;
@@ -302,9 +274,6 @@ gtk_style_context_impl_get_property (GObject    *object,
     case PROP_DISPLAY:
       g_value_set_object (value, priv->display);
       break;
-    case PROP_PARENT:
-      g_value_set_object (value, priv->parent);
-      break;
     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
       break;
@@ -667,70 +636,6 @@ gtk_style_context_get_scale (GtkStyleContext *context)
   return _gtk_style_cascade_get_scale (priv->cascade);
 }
 
-/**
- * gtk_style_context_set_parent:
- * @context: a #GtkStyleContext
- * @parent: (allow-none): the new parent or %NULL
- *
- * Sets the parent style context for @context. The parent style
- * context is used to implement
- * [inheritance](http://www.w3.org/TR/css3-cascade/#inheritance)
- * of properties.
- *
- * If you are using a #GtkStyleContext returned from
- * gtk_widget_get_style_context(), the parent will be set for you.
- **/
-void
-gtk_style_context_set_parent (GtkStyleContext *context,
-                              GtkStyleContext *parent)
-{
-  GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context);
-
-  g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
-  g_return_if_fail (parent == NULL || GTK_IS_STYLE_CONTEXT (parent));
-
-  if (priv->parent == parent)
-    return;
-
-  if (parent)
-    {
-      GtkCssNode *root = gtk_style_context_get_root (context);
-      g_object_ref (parent);
-
-      if (gtk_css_node_get_parent (root) == NULL)
-        gtk_css_node_set_parent (root, gtk_style_context_get_root (parent));
-    }
-  else
-    {
-      gtk_css_node_set_parent (gtk_style_context_get_root (context), NULL);
-    }
-
-  gtk_style_context_clear_parent (context);
-
-  priv->parent = parent;
-
-  g_object_notify_by_pspec (G_OBJECT (context), properties[PROP_PARENT]);
-}
-
-/**
- * gtk_style_context_get_parent:
- * @context: a #GtkStyleContext
- *
- * Gets the parent context set via gtk_style_context_set_parent().
- * See that function for details.
- *
- * Returns: (nullable) (transfer none): the parent context or %NULL
- **/
-GtkStyleContext *
-gtk_style_context_get_parent (GtkStyleContext *context)
-{
-  GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context);
-
-  g_return_val_if_fail (GTK_IS_STYLE_CONTEXT (context), NULL);
-
-  return priv->parent;
-}
-
 /*
  * gtk_style_context_save_to_node:
  * @context: a #GtkStyleContext
diff --git a/gtk/gtkstylecontext.h b/gtk/gtkstylecontext.h
index 991c7a5a3d..0c4c0c1ebb 100644
--- a/gtk/gtkstylecontext.h
+++ b/gtk/gtkstylecontext.h
@@ -883,9 +883,6 @@ void          gtk_style_context_set_scale    (GtkStyleContext *context,
 GDK_AVAILABLE_IN_ALL
 gint          gtk_style_context_get_scale    (GtkStyleContext *context);
 
-GDK_AVAILABLE_IN_ALL
-void          gtk_style_context_set_parent   (GtkStyleContext *context,
-                                              GtkStyleContext *parent);
 GDK_AVAILABLE_IN_ALL
 GtkStyleContext *gtk_style_context_get_parent (GtkStyleContext *context);
 
diff --git a/gtk/gtktexthandle.c b/gtk/gtktexthandle.c
index 3f993920ba..a4d86bbe24 100644
--- a/gtk/gtktexthandle.c
+++ b/gtk/gtktexthandle.c
@@ -200,7 +200,6 @@ _gtk_text_handle_ensure_widget (GtkTextHandle         *handle,
   if (!priv->windows[pos].widget)
     {
       GtkWidget *widget, *window;
-      GtkStyleContext *context;
       GtkEventController *controller;
 
       widget = gtk_gizmo_new (I_("cursor-handle"), NULL, NULL, snapshot_func, NULL);
@@ -220,16 +219,14 @@ _gtk_text_handle_ensure_widget (GtkTextHandle         *handle,
       priv->toplevel = window = gtk_widget_get_ancestor (priv->parent, GTK_TYPE_WINDOW);
       _gtk_window_add_popover (GTK_WINDOW (window), widget, priv->parent, FALSE);
 
-      context = gtk_widget_get_style_context (widget);
-      gtk_style_context_set_parent (context, gtk_widget_get_style_context (priv->parent));
       if (pos == GTK_TEXT_HANDLE_POSITION_SELECTION_END)
         {
-          gtk_style_context_add_class (context, GTK_STYLE_CLASS_BOTTOM);
+          gtk_widget_add_style_class (widget, GTK_STYLE_CLASS_BOTTOM);
           if (priv->mode == GTK_TEXT_HANDLE_MODE_CURSOR)
-            gtk_style_context_add_class (context, GTK_STYLE_CLASS_INSERTION_CURSOR);
+            gtk_widget_add_style_class (widget, GTK_STYLE_CLASS_INSERTION_CURSOR);
         }
       else
-        gtk_style_context_add_class (context, GTK_STYLE_CLASS_TOP);
+        gtk_widget_add_style_class (widget, GTK_STYLE_CLASS_TOP);
     }
 
   return priv->windows[pos].widget;
diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index 503208e17f..1121753f6e 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -2630,8 +2630,6 @@ gtk_widget_unparent (GtkWidget *widget)
 
   /* Unset BACKDROP since we are no longer inside a toplevel window */
   gtk_widget_unset_state_flags (widget, GTK_STATE_FLAG_BACKDROP);
-  if (priv->context)
-    gtk_style_context_set_parent (priv->context, NULL);
   gtk_css_node_set_parent (priv->cssnode, NULL);
 
   _gtk_widget_update_parent_muxer (widget);
@@ -6129,10 +6127,6 @@ gtk_widget_reposition_after (GtkWidget *widget,
                                  previous_sibling ? previous_sibling->priv->cssnode : NULL);
     }
 
-  if (priv->context)
-    gtk_style_context_set_parent (priv->context,
-                                  _gtk_widget_get_style_context (parent));
-
   _gtk_widget_update_parent_muxer (widget);
 
   if (parent->priv->children_observer)
@@ -11255,10 +11249,6 @@ gtk_widget_get_style_context (GtkWidget *widget)
       display = _gtk_widget_get_display (widget);
       if (display)
         gtk_style_context_set_display (priv->context, display);
-
-      if (priv->parent)
-        gtk_style_context_set_parent (priv->context,
-                                      _gtk_widget_get_style_context (priv->parent));
     }
 
   return priv->context;
diff --git a/gtk/gtkwindow.c b/gtk/gtkwindow.c
index bb251e3205..c4e4446728 100644
--- a/gtk/gtkwindow.c
+++ b/gtk/gtkwindow.c
@@ -3243,7 +3243,6 @@ void
 gtk_window_set_attached_to (GtkWindow *window,
                             GtkWidget *attach_widget)
 {
-  GtkStyleContext *context;
   GtkWindowPrivate *priv = gtk_window_get_instance_private (window);
 
   g_return_if_fail (GTK_IS_WINDOW (window));
@@ -3262,11 +3261,11 @@ gtk_window_set_attached_to (GtkWindow *window,
     }
 
   /* Update the style, as the widget path might change. */
-  context = gtk_widget_get_style_context (GTK_WIDGET (window));
   if (priv->attach_widget)
-    gtk_style_context_set_parent (context, gtk_widget_get_style_context (priv->attach_widget));
+    gtk_css_node_set_parent (gtk_widget_get_css_node (GTK_WIDGET (window)),
+                             gtk_widget_get_css_node (priv->attach_widget));
   else
-    gtk_style_context_set_parent (context, NULL);
+    gtk_css_node_set_parent (gtk_widget_get_css_node (GTK_WIDGET (window)), NULL);
 
   g_object_notify_by_pspec (G_OBJECT (window), window_props[PROP_ATTACHED_TO]);
 }