[gtk+/wip/otte/gadget: 3/18] gadget: Add the concept of a "gadget"



commit c82fbcdf35cdceffa4b177f506b7268d20d15101
Author: Benjamin Otte <otte redhat com>
Date:   Wed Sep 9 00:13:11 2015 +0200

    gadget: Add the concept of a "gadget"
    
    A gadget is halfway between a widget and a CSS node. It's supposed to
    provide the minimum convenicence around CSS nodes until we've figured
    out how to integrate them with widgets.

 gtk/Makefile.am           |    2 +
 gtk/gtkcssgadget.c        |  565 +++++++++++++++++++++++++++++++++++++++++++++
 gtk/gtkcssgadgetprivate.h |  102 ++++++++
 3 files changed, 669 insertions(+), 0 deletions(-)
---
diff --git a/gtk/Makefile.am b/gtk/Makefile.am
index 6de7f4a..2d18db9 100644
--- a/gtk/Makefile.am
+++ b/gtk/Makefile.am
@@ -390,6 +390,7 @@ gtk_private_h_sources =             \
        gtkcsseasevalueprivate.h        \
        gtkcssenginevalueprivate.h      \
        gtkcssenumvalueprivate.h        \
+       gtkcssgadgetprivate.h           \
        gtkcssiconthemevalueprivate.h   \
        gtkcssimagebuiltinprivate.h     \
        gtkcssimagecrossfadeprivate.h   \
@@ -643,6 +644,7 @@ gtk_base_c_sources =                \
        gtkcsseasevalue.c       \
        gtkcssenumvalue.c       \
        gtkcssenginevalue.c     \
+       gtkcssgadget.c          \
        gtkcssiconthemevalue.c  \
        gtkcssimage.c           \
        gtkcssimagebuiltin.c    \
diff --git a/gtk/gtkcssgadget.c b/gtk/gtkcssgadget.c
new file mode 100644
index 0000000..de86418
--- /dev/null
+++ b/gtk/gtkcssgadget.c
@@ -0,0 +1,565 @@
+/*
+ * Copyright © 2015 Red Hat Inc.
+ *
+ * This library 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 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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 library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors: Benjamin Otte <otte gnome org>
+ */
+
+#include "config.h"
+
+#include "gtkcssgadgetprivate.h"
+
+#include <math.h>
+
+#include "gtkcssnumbervalueprivate.h"
+#include "gtkcssshadowsvalueprivate.h"
+#include "gtkcssstyleprivate.h"
+#include "gtkcssstylepropertyprivate.h"
+#include "gtkcsswidgetnodeprivate.h"
+#include "gtkrenderbackgroundprivate.h"
+#include "gtkrenderborderprivate.h"
+
+typedef struct _GtkCssGadgetPrivate GtkCssGadgetPrivate;
+struct _GtkCssGadgetPrivate {
+  GtkCssNode    *node;
+  GtkWidget     *owner;
+  GtkAllocation  allocated_size;
+  gint           allocated_baseline;
+};
+
+enum {
+  PROP_0,
+  PROP_NODE,
+  PROP_OWNER,
+  /* add more */
+  NUM_PROPERTIES
+};
+
+static GParamSpec *properties[NUM_PROPERTIES];
+
+G_DEFINE_ABSTRACT_TYPE_WITH_CODE (GtkCssGadget, gtk_css_gadget, G_TYPE_OBJECT,
+                                  G_ADD_PRIVATE (GtkCssGadget))
+
+static void
+gtk_css_gadget_real_get_preferred_size (GtkCssGadget   *gadget,
+                                        GtkOrientation  orientation,
+                                        gint            for_size,
+                                        gint           *minimum,
+                                        gint           *natural,
+                                        gint           *minimum_baseline,
+                                        gint           *natural_baseline)
+{
+  *minimum = 0;
+  *natural = 0;
+
+  if (minimum_baseline)
+    *minimum_baseline = 0;
+  if (natural_baseline)
+    *natural_baseline = 0;
+}
+
+static void
+gtk_css_gadget_real_allocate (GtkCssGadget        *gadget,
+                              const GtkAllocation *allocation,
+                              int                  baseline,
+                              GtkAllocation       *out_clip)
+{
+  *out_clip = *allocation;
+}
+
+static gboolean
+gtk_css_gadget_real_draw (GtkCssGadget *gadget,
+                          cairo_t      *cr,
+                          int           x,
+                          int           y,
+                          int           width,
+                          int           height)
+{
+  return FALSE;
+}
+
+static void
+gtk_css_gadget_real_style_changed (GtkCssGadget      *gadget,
+                                   GtkCssStyleChange *change)
+{
+  GtkCssGadgetPrivate *priv = gtk_css_gadget_get_instance_private (gadget);
+
+  if (priv->owner)
+    {
+      if (gtk_css_style_change_affects (change, GTK_CSS_AFFECTS_SIZE))
+        gtk_widget_queue_resize (priv->owner);
+      else if (gtk_css_style_change_affects (change, GTK_CSS_AFFECTS_CLIP))
+        gtk_widget_queue_allocate (priv->owner);
+      else if (gtk_css_style_change_affects (change, GTK_CSS_AFFECTS_REDRAW))
+        gtk_widget_queue_draw (priv->owner);
+    }
+}
+
+static void
+gtk_css_gadget_get_property (GObject    *object,
+                             guint       property_id,
+                             GValue     *value,
+                             GParamSpec *pspec)
+{
+  GtkCssGadgetPrivate *priv = gtk_css_gadget_get_instance_private (GTK_CSS_GADGET (object));
+
+  switch (property_id)
+  {
+    case PROP_NODE:
+      g_value_set_object (value, priv->node);
+      break;
+
+    case PROP_OWNER:
+      g_value_set_object (value, priv->owner);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+  }
+}
+
+static void
+gtk_css_gadget_node_style_changed_cb (GtkCssNode        *node,
+                                      GtkCssStyleChange *change,
+                                      GtkCssGadget      *gadget)
+{
+  GtkCssGadgetClass *klass = GTK_CSS_GADGET_GET_CLASS (gadget);
+
+  klass->style_changed (gadget, change);
+}
+
+static gboolean
+gtk_css_gadget_should_connect_style_changed (GtkCssNode *node)
+{
+  /* Delegate to WidgetClass->style_changed */
+  if (GTK_IS_CSS_WIDGET_NODE (node))
+    return FALSE;
+
+  return TRUE;
+}
+
+static void
+gtk_css_gadget_unset_node (GtkCssGadget *gadget)
+{
+  GtkCssGadgetPrivate *priv = gtk_css_gadget_get_instance_private (gadget);
+
+  if (priv->node)
+    {
+      if (gtk_css_gadget_should_connect_style_changed (priv->node))
+        {
+        if (g_signal_handlers_disconnect_by_func (priv->node, gtk_css_gadget_node_style_changed_cb, gadget) 
!= 1)
+          {
+            g_assert_not_reached ();
+          }
+        }
+      g_object_unref (priv->node);
+      priv->node = NULL;
+    }
+}
+
+static void
+gtk_css_gadget_set_node (GtkCssGadget *gadget,
+                         GtkCssNode   *node)
+{
+  GtkCssGadgetPrivate *priv = gtk_css_gadget_get_instance_private (gadget);
+
+  if (node != NULL)
+    priv->node = g_object_ref (node);
+  else
+    priv->node = gtk_css_node_new ();
+
+  if (gtk_css_gadget_should_connect_style_changed (priv->node))
+    {
+      g_signal_connect_after (priv->node,
+                              "style-changed",
+                              G_CALLBACK (gtk_css_gadget_node_style_changed_cb),
+                              gadget);
+    }
+}
+
+static void
+gtk_css_gadget_set_property (GObject      *object,
+                             guint         property_id,
+                             const GValue *value,
+                             GParamSpec   *pspec)
+{
+  GtkCssGadget *gadget = GTK_CSS_GADGET (object);
+  GtkCssGadgetPrivate *priv = gtk_css_gadget_get_instance_private (gadget);
+
+  switch (property_id)
+  {
+    case PROP_NODE:
+      gtk_css_gadget_set_node (gadget, g_value_get_object (value));
+      break;
+
+    case PROP_OWNER:
+      priv->owner = g_value_get_object (value);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+  }
+}
+
+
+static void
+gtk_css_gadget_finalize (GObject *object)
+{
+  GtkCssGadget *gadget = GTK_CSS_GADGET (object);
+
+  gtk_css_gadget_unset_node (gadget);
+
+  G_OBJECT_CLASS (gtk_css_gadget_parent_class)->finalize (object);
+}
+
+static void
+gtk_css_gadget_class_init (GtkCssGadgetClass *klass)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+  object_class->get_property = gtk_css_gadget_get_property;
+  object_class->set_property = gtk_css_gadget_set_property;
+  object_class->finalize = gtk_css_gadget_finalize;
+
+  klass->get_preferred_size = gtk_css_gadget_real_get_preferred_size;
+  klass->allocate = gtk_css_gadget_real_allocate;
+  klass->draw = gtk_css_gadget_real_draw;
+  klass->style_changed = gtk_css_gadget_real_style_changed;
+
+  properties[PROP_NODE] = g_param_spec_object ("node", "Node",
+                                               "CSS node",
+                                               GTK_TYPE_CSS_NODE,
+                                               G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
+                                               G_PARAM_EXPLICIT_NOTIFY | G_PARAM_STATIC_STRINGS);
+  properties[PROP_OWNER] = g_param_spec_object ("owner", "Owner",
+                                                "Widget that created and owns this gadget",
+                                                GTK_TYPE_WIDGET,
+                                                G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
+                                                G_PARAM_EXPLICIT_NOTIFY | G_PARAM_STATIC_STRINGS);
+
+
+  g_object_class_install_properties (object_class, NUM_PROPERTIES, properties);
+}
+
+static void
+gtk_css_gadget_init (GtkCssGadget *gadget)
+{
+
+}
+
+GtkCssNode *
+gtk_css_gadget_get_node (GtkCssGadget *gadget)
+{
+  GtkCssGadgetPrivate *priv = gtk_css_gadget_get_instance_private (gadget);
+
+  return priv->node;
+}
+
+GtkCssStyle *
+gtk_css_gadget_get_style (GtkCssGadget *gadget)
+{
+  GtkCssGadgetPrivate *priv = gtk_css_gadget_get_instance_private (gadget);
+
+  return gtk_css_node_get_style (priv->node);
+}
+
+GtkWidget *
+gtk_css_gadget_get_owner (GtkCssGadget *gadget)
+{
+  GtkCssGadgetPrivate *priv = gtk_css_gadget_get_instance_private (gadget);
+
+  return priv->owner;
+}
+
+void
+gtk_css_gadget_add_class (GtkCssGadget *gadget,
+                          const char   *name)
+{
+  GtkCssGadgetPrivate *priv = gtk_css_gadget_get_instance_private (gadget);
+  GQuark quark;
+
+  quark = g_quark_from_string (name);
+
+  gtk_css_node_add_class (priv->node, quark);
+}
+
+void
+gtk_css_gadget_remove_class (GtkCssGadget *gadget,
+                             const char   *name)
+{
+  GtkCssGadgetPrivate *priv = gtk_css_gadget_get_instance_private (gadget);
+  GQuark quark;
+
+  quark = g_quark_try_string (name);
+  if (quark == 0)
+    return;
+
+  gtk_css_node_remove_class (priv->node, quark);
+}
+
+static gint
+get_number (GtkCssStyle *style,
+            guint        property)
+{
+  double d = _gtk_css_number_value_get (gtk_css_style_get_value (style, property), 100);
+
+  if (d < 1)
+    return ceil (d);
+  else
+    return floor (d);
+}
+
+static void
+get_box_margin (GtkCssStyle *style,
+                GtkBorder   *margin)
+{
+  margin->top = get_number (style, GTK_CSS_PROPERTY_MARGIN_TOP);
+  margin->left = get_number (style, GTK_CSS_PROPERTY_MARGIN_LEFT);
+  margin->bottom = get_number (style, GTK_CSS_PROPERTY_MARGIN_BOTTOM);
+  margin->right = get_number (style, GTK_CSS_PROPERTY_MARGIN_RIGHT);
+}
+
+static void
+get_box_border (GtkCssStyle *style,
+                GtkBorder   *border)
+{
+  border->top = get_number (style, GTK_CSS_PROPERTY_BORDER_TOP_WIDTH);
+  border->left = get_number (style, GTK_CSS_PROPERTY_BORDER_LEFT_WIDTH);
+  border->bottom = get_number (style, GTK_CSS_PROPERTY_BORDER_BOTTOM_WIDTH);
+  border->right = get_number (style, GTK_CSS_PROPERTY_BORDER_RIGHT_WIDTH);
+}
+
+static void
+get_box_padding (GtkCssStyle *style,
+                 GtkBorder   *border)
+{
+  border->top = get_number (style, GTK_CSS_PROPERTY_PADDING_TOP);
+  border->left = get_number (style, GTK_CSS_PROPERTY_PADDING_LEFT);
+  border->bottom = get_number (style, GTK_CSS_PROPERTY_PADDING_BOTTOM);
+  border->right = get_number (style, GTK_CSS_PROPERTY_PADDING_RIGHT);
+}
+
+void
+gtk_css_gadget_get_preferred_size (GtkCssGadget   *gadget,
+                                   GtkOrientation  orientation,
+                                   gint            for_size,
+                                   gint           *minimum,
+                                   gint           *natural,
+                                   gint           *minimum_baseline,
+                                   gint           *natural_baseline)
+{
+  GtkCssStyle *style;
+  GtkBorder margin, border, padding;
+  int min_size, extra_size, extra_opposite, extra_baseline;
+  int unused_minimum, unused_natural;
+
+  if (minimum == NULL)
+    minimum = &unused_minimum;
+  if (natural == NULL)
+    natural = &unused_natural;
+
+  style = gtk_css_gadget_get_style (gadget);
+  get_box_margin (style, &margin);
+  get_box_border (style, &border);
+  get_box_padding (style, &padding);
+  if (orientation == GTK_ORIENTATION_HORIZONTAL)
+    {
+      extra_size = margin.left + margin.right + border.left + border.right + padding.left + padding.right;
+      extra_opposite = margin.top + margin.bottom + border.top + border.bottom + padding.top + 
padding.bottom;
+      extra_baseline = margin.left + border.left + padding.left;
+      min_size = get_number (style, GTK_CSS_PROPERTY_MIN_WIDTH);
+    }
+  else
+    {
+      extra_size = margin.top + margin.bottom + border.top + border.bottom + padding.top + padding.bottom;
+      extra_opposite = margin.left + margin.right + border.left + border.right + padding.left + 
padding.right;
+      extra_baseline = margin.top + border.top + padding.top;
+      min_size = get_number (style, GTK_CSS_PROPERTY_MIN_HEIGHT);
+    }
+
+  if (for_size > -1)
+    for_size -= extra_opposite;
+
+  if (minimum_baseline)
+    *minimum_baseline = -1;
+  if (natural_baseline)
+    *natural_baseline = -1;
+
+  GTK_CSS_GADGET_GET_CLASS (gadget)->get_preferred_size (gadget,
+                                                         orientation,
+                                                         for_size,
+                                                         minimum, natural,
+                                                         minimum_baseline, natural_baseline);
+
+  g_warn_if_fail (*minimum <= *natural);
+
+  *minimum = MAX (min_size, *minimum);
+  *natural = MAX (min_size, *natural);
+
+  *minimum += extra_size;
+  *natural += extra_size;
+
+  if (minimum_baseline && *minimum_baseline > -1)
+    *minimum_baseline += extra_baseline;
+  if (natural_baseline && *natural_baseline > -1)
+    *natural_baseline += extra_baseline;
+}
+
+void
+gtk_css_gadget_allocate (GtkCssGadget        *gadget,
+                         const GtkAllocation *allocation,
+                         int                  baseline,
+                         GtkAllocation       *out_clip)
+{
+  GtkCssGadgetPrivate *priv = gtk_css_gadget_get_instance_private (gadget);
+  GtkAllocation content_allocation, content_clip;
+  GtkBorder margin, border, padding, shadow, extents;
+  GtkCssStyle *style;
+
+  g_return_if_fail (out_clip != NULL);
+
+  priv->allocated_size = *allocation;
+  priv->allocated_baseline = baseline;
+
+  style = gtk_css_gadget_get_style (gadget);
+  get_box_margin (style, &margin);
+  get_box_border (style, &border);
+  get_box_padding (style, &padding);
+  extents.top = margin.top + border.top + padding.top;
+  extents.right = margin.right + border.right + padding.right;
+  extents.bottom = margin.bottom + border.bottom + padding.bottom;
+  extents.left = margin.left + border.left + padding.left;
+
+  content_allocation.x = allocation->x + extents.left;
+  content_allocation.y = allocation->y + extents.top;
+  content_allocation.width = allocation->width - extents.left - extents.right;
+  content_allocation.height = allocation->height - extents.top - extents.bottom;
+  if (baseline >= 0)
+    baseline += extents.top;
+
+  g_assert (content_allocation.width >= 0);
+  g_assert (content_allocation.height >= 0);
+
+  GTK_CSS_GADGET_GET_CLASS (gadget)->allocate (gadget, &content_allocation, baseline, &content_clip);
+
+  _gtk_css_shadows_value_get_extents (gtk_css_style_get_value (style, GTK_CSS_PROPERTY_BOX_SHADOW), &shadow);
+  out_clip->x = allocation->x + margin.left - shadow.left;
+  out_clip->y = allocation->y + margin.top - shadow.top;
+  out_clip->width = allocation->width - margin.left - margin.right + shadow.left + shadow.right;
+  out_clip->height = allocation->height - margin.top - margin.bottom + shadow.top + shadow.bottom;
+  gdk_rectangle_union (&content_clip, out_clip, out_clip);
+}
+
+/**
+ * gtk_css_gadget_draw:
+ * @gadget: The gadget to draw
+ * @cr: The cairo context to draw to
+ *
+ * Will draw the gadget at the position allocated via
+ * gtk_css_gadget_allocate(). It is your responsibility to make
+ * sure that those 2 coordinate systems match.
+ *
+ * The drawing virtual function will be passed an untransformed @cr.
+ * This is important because functions like
+ * gtk_container_propagate_draw() depend on that.
+ */
+void
+gtk_css_gadget_draw (GtkCssGadget *gadget,
+                     cairo_t      *cr)
+{
+  GtkCssGadgetPrivate *priv = gtk_css_gadget_get_instance_private (gadget);
+  GtkBorder margin, border, padding;
+  gboolean draw_focus;
+  GtkCssStyle *style;
+  int x, y, width, height;
+  int contents_x, contents_y, contents_width, contents_height;
+
+  x =  priv->allocated_size.x;
+  y =  priv->allocated_size.y;
+  if (priv->owner && !gtk_widget_get_has_window (priv->owner))
+    {
+      GtkAllocation widget_alloc;
+      gtk_widget_get_allocation (priv->owner, &widget_alloc);
+      x -= widget_alloc.x;
+      y -= widget_alloc.y;
+    }
+  width = priv->allocated_size.width;
+  height = priv->allocated_size.height;
+
+  style = gtk_css_gadget_get_style (gadget);
+  get_box_margin (style, &margin);
+  get_box_border (style, &border);
+  get_box_padding (style, &padding);
+
+  gtk_css_style_render_background (style,
+                                   cr,
+                                   x + margin.left,
+                                   y + margin.top,
+                                   width - margin.left - margin.right,
+                                   height - margin.top - margin.bottom,
+                                   gtk_css_node_get_junction_sides (priv->node));
+  gtk_css_style_render_border (style,
+                               cr,
+                               x + margin.left,
+                               y + margin.top,
+                               width - margin.left - margin.right,
+                               height - margin.top - margin.bottom,
+                               0,
+                               gtk_css_node_get_junction_sides (priv->node));
+
+  contents_x = x + margin.left + border.left + padding.left;
+  contents_y = y + margin.top + border.top + padding.top;
+  contents_width = width - margin.left - margin.right - border.left - border.right - padding.left - 
padding.right;
+  contents_height = height - margin.top - margin.bottom - border.top - border.bottom - padding.top - 
padding.bottom;
+
+  draw_focus = GTK_CSS_GADGET_GET_CLASS (gadget)->draw (gadget,
+                                                        cr,
+                                                        contents_x, contents_y,
+                                                        contents_width, contents_height);
+
+  if (draw_focus)
+    gtk_css_style_render_outline (style,
+                                  cr,
+                                  x + margin.left,
+                                  y + margin.top,
+                                  width - margin.left - margin.right,
+                                  height - margin.top - margin.bottom);
+}
+
+void
+gtk_css_node_style_changed_for_widget (GtkCssNode  *node,
+                                       GtkCssStyle *old_style,
+                                       GtkCssStyle *new_style,
+                                       GtkWidget    *widget)
+{
+  static GtkBitmask *affects_size = NULL;
+  GtkBitmask *changes;
+  
+  changes = _gtk_bitmask_new ();
+  changes = gtk_css_style_add_difference (changes, old_style, new_style);
+
+  if (G_UNLIKELY (affects_size == NULL))
+    affects_size = _gtk_css_style_property_get_mask_affecting (GTK_CSS_AFFECTS_SIZE | GTK_CSS_AFFECTS_CLIP);
+
+  if (_gtk_bitmask_intersects (changes, affects_size))
+    gtk_widget_queue_resize (widget);
+  else
+    gtk_widget_queue_draw (widget);
+
+  _gtk_bitmask_free (changes);
+}
+
diff --git a/gtk/gtkcssgadgetprivate.h b/gtk/gtkcssgadgetprivate.h
new file mode 100644
index 0000000..4000724
--- /dev/null
+++ b/gtk/gtkcssgadgetprivate.h
@@ -0,0 +1,102 @@
+/*
+ * Copyright © 2015 Red Hat Inc.
+ *
+ * This library 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 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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 library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors: Benjamin Otte <otte gnome org>
+ */
+
+#ifndef __GTK_CSS_GADGET_PRIVATE_H__
+#define __GTK_CSS_GADGET_PRIVATE_H__
+
+#include <cairo.h>
+#include <glib-object.h>
+
+#include "gtk/gtkwidget.h"
+#include "gtk/gtkcssstylechangeprivate.h"
+#include "gtk/gtkcsstypesprivate.h"
+
+G_BEGIN_DECLS
+
+#define GTK_TYPE_CSS_GADGET           (gtk_css_gadget_get_type ())
+#define GTK_CSS_GADGET(obj)           (G_TYPE_CHECK_INSTANCE_CAST (obj, GTK_TYPE_CSS_GADGET, GtkCssGadget))
+#define GTK_CSS_GADGET_CLASS(cls)     (G_TYPE_CHECK_CLASS_CAST (cls, GTK_TYPE_CSS_GADGET, GtkCssGadgetClass))
+#define GTK_IS_CSS_GADGET(obj)        (G_TYPE_CHECK_INSTANCE_TYPE (obj, GTK_TYPE_CSS_GADGET))
+#define GTK_IS_CSS_GADGET_CLASS(obj)  (G_TYPE_CHECK_CLASS_TYPE (obj, GTK_TYPE_CSS_GADGET))
+#define GTK_CSS_GADGET_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_CSS_GADGET, 
GtkCssGadgetClass))
+
+typedef struct _GtkCssGadget           GtkCssGadget;
+typedef struct _GtkCssGadgetClass      GtkCssGadgetClass;
+
+struct _GtkCssGadget
+{
+  GObject parent;
+};
+
+struct _GtkCssGadgetClass
+{
+  GObjectClass  parent_class;
+
+  void          (* get_preferred_size)                  (GtkCssGadget           *gadget,
+                                                         GtkOrientation          orientation,
+                                                         gint                    for_size,
+                                                         gint                   *minimum,
+                                                         gint                   *natural,
+                                                         gint                   *minimum_baseline,
+                                                         gint                   *natural_baseline);
+
+  void          (* allocate)                            (GtkCssGadget           *gadget,
+                                                         const GtkAllocation    *allocation,
+                                                         int                     baseline,
+                                                         GtkAllocation          *out_clip);
+
+  gboolean      (* draw)                                (GtkCssGadget           *gadget,
+                                                         cairo_t                *cr,
+                                                         int                     x,
+                                                         int                     y,
+                                                         int                     width,
+                                                         int                     height);
+
+  void          (* style_changed)                       (GtkCssGadget           *gadget,
+                                                         GtkCssStyleChange      *change);
+};
+
+GType           gtk_css_gadget_get_type                 (void) G_GNUC_CONST;
+
+GtkCssNode *    gtk_css_gadget_get_node                 (GtkCssGadget           *gadget);
+GtkCssStyle *   gtk_css_gadget_get_style                (GtkCssGadget           *gadget);
+GtkWidget *     gtk_css_gadget_get_owner                (GtkCssGadget           *gadget);
+
+void            gtk_css_gadget_add_class                (GtkCssGadget           *gadget,
+                                                         const char             *name);
+void            gtk_css_gadget_remove_class             (GtkCssGadget           *gadget,
+                                                         const char             *name);
+
+void            gtk_css_gadget_get_preferred_size       (GtkCssGadget           *gadget,
+                                                         GtkOrientation          orientation,
+                                                         gint                    for_size,
+                                                         gint                   *minimum,
+                                                         gint                   *natural,
+                                                         gint                   *minimum_baseline,
+                                                         gint                   *natural_baseline);
+void            gtk_css_gadget_allocate                 (GtkCssGadget           *gadget,
+                                                         const GtkAllocation    *allocation,
+                                                         int                     baseline,
+                                                         GtkAllocation          *out_clip);
+void            gtk_css_gadget_draw                     (GtkCssGadget           *gadget,
+                                                         cairo_t                *cr);
+
+G_END_DECLS
+
+#endif /* __GTK_CSS_GADGET_PRIVATE_H__ */


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