Added GtkCellAreaIter class

Added base class to hold alignment and overall size request information
while itterating over the size requests of various rows of a GtkTreeModel,
updated GtkCellArea/GtkCellAreaBox classes accordingly.

gtk/Makefile.am

@@ -170,6 +170,7 @@ gtk_public_h_sources =          \
 	gtkcalendar.h		\
 	gtkcellarea.h		\
 	gtkcellareabox.h	\
+	gtkcellareaiter.h	\
 	gtkcelleditable.h	\
 	gtkcelllayout.h		\
 	gtkcellrenderer.h	\
@@ -434,6 +435,7 @@ gtk_base_c_sources =            \
 	gtkcalendar.c		\
 	gtkcellarea.c		\
 	gtkcellareabox.c	\
+	gtkcellareaiter.c	\
 	gtkcelleditable.c	\
 	gtkcelllayout.c		\
 	gtkcellrenderer.c	\

gtk/gtkcellarea.c

@@ -30,11 +30,13 @@ static void      gtk_cell_area_finalize                            (GObject
 
 /* GtkCellAreaClass */
 static void      gtk_cell_area_real_get_preferred_height_for_width (GtkCellArea        *area,
+								    GtkCellAreaIter    *iter,
 								    GtkWidget          *widget,
 								    gint                width,
 								    gint               *minimum_height,
 								    gint               *natural_height);
 static void      gtk_cell_area_real_get_preferred_width_for_height (GtkCellArea        *area,
+								    GtkCellAreaIter    *iter,
 								    GtkWidget          *widget,
 								    gint                height,
 								    gint               *minimum_width,
@@ -138,6 +140,7 @@ gtk_cell_area_class_init (GtkCellAreaClass *class)
   class->render  = NULL;
 
   /* geometry */
+  class->create_iter                    = NULL;
   class->get_request_mode               = NULL;
   class->get_preferred_width            = NULL;
   class->get_preferred_height           = NULL;
@@ -253,24 +256,26 @@ gtk_cell_area_dispose (GObject *object)
  *************************************************************/
 static void
 gtk_cell_area_real_get_preferred_height_for_width (GtkCellArea        *area,
+						   GtkCellAreaIter    *iter,
 						   GtkWidget          *widget,
 						   gint                width,
 						   gint               *minimum_height,
 						   gint               *natural_height)
 {
   /* If the area doesnt do height-for-width, fallback on base preferred height */
-  GTK_CELL_AREA_GET_CLASS (area)->get_preferred_width (area, widget, minimum_height, natural_height);
+  GTK_CELL_AREA_GET_CLASS (area)->get_preferred_width (area, iter, widget, minimum_height, natural_height);
 }
 
 static void
 gtk_cell_area_real_get_preferred_width_for_height (GtkCellArea        *area,
+						   GtkCellAreaIter    *iter,
 						   GtkWidget          *widget,
 						   gint                height,
 						   gint               *minimum_width,
 						   gint               *natural_width)
 {
   /* If the area doesnt do width-for-height, fallback on base preferred width */
-  GTK_CELL_AREA_GET_CLASS (area)->get_preferred_width (area, widget, minimum_width, natural_width);
+  GTK_CELL_AREA_GET_CLASS (area)->get_preferred_width (area, iter, widget, minimum_width, natural_width);
 }
 
 /*************************************************************
@@ -520,6 +525,25 @@ gtk_cell_area_render (GtkCellArea        *area,
 }
 
 /* Geometry */
+GtkCellAreaIter   *
+gtk_cell_area_create_iter (GtkCellArea *area)
+{
+  GtkCellAreaClass *class;
+
+  g_return_val_if_fail (GTK_IS_CELL_AREA (area), NULL);
+
+  class = GTK_CELL_AREA_GET_CLASS (area);
+
+  if (class->create_iter)
+    return class->create_iter (area);
+
+  g_warning ("GtkCellAreaClass::create_iter not implemented for `%s'", 
+	     g_type_name (G_TYPE_FROM_INSTANCE (area)));
+  
+  return NULL;
+}
+
+
 GtkSizeRequestMode 
 gtk_cell_area_get_request_mode (GtkCellArea *area)
 {
@@ -541,6 +565,7 @@ gtk_cell_area_get_request_mode (GtkCellArea *area)
 
 void
 gtk_cell_area_get_preferred_width (GtkCellArea        *area,
+				   GtkCellAreaIter    *iter,
 				   GtkWidget          *widget,
 				   gint               *minimum_size,
 				   gint               *natural_size)
@@ -553,7 +578,7 @@ gtk_cell_area_get_preferred_width (GtkCellArea        *area,
   class = GTK_CELL_AREA_GET_CLASS (area);
 
   if (class->get_preferred_width)
-    class->get_preferred_width (area, widget, minimum_size, natural_size);
+    class->get_preferred_width (area, iter, widget, minimum_size, natural_size);
   else
     g_warning ("GtkCellAreaClass::get_preferred_width not implemented for `%s'", 
 	       g_type_name (G_TYPE_FROM_INSTANCE (area)));
@@ -561,6 +586,7 @@ gtk_cell_area_get_preferred_width (GtkCellArea        *area,
 
 void
 gtk_cell_area_get_preferred_height_for_width (GtkCellArea        *area,
+					      GtkCellAreaIter    *iter,
 					      GtkWidget          *widget,
 					      gint                width,
 					      gint               *minimum_height,
@@ -572,11 +598,12 @@ gtk_cell_area_get_preferred_height_for_width (GtkCellArea        *area,
   g_return_if_fail (GTK_IS_WIDGET (widget));
 
   class = GTK_CELL_AREA_GET_CLASS (area);
-  class->get_preferred_height_for_width (area, widget, width, minimum_height, natural_height);
+  class->get_preferred_height_for_width (area, iter, widget, width, minimum_height, natural_height);
 }
 
 void
 gtk_cell_area_get_preferred_height (GtkCellArea        *area,
+				    GtkCellAreaIter    *iter,
 				    GtkWidget          *widget,
 				    gint               *minimum_size,
 				    gint               *natural_size)
@@ -589,7 +616,7 @@ gtk_cell_area_get_preferred_height (GtkCellArea        *area,
   class = GTK_CELL_AREA_GET_CLASS (area);
 
   if (class->get_preferred_height)
-    class->get_preferred_height (area, widget, minimum_size, natural_size);
+    class->get_preferred_height (area, iter, widget, minimum_size, natural_size);
   else
     g_warning ("GtkCellAreaClass::get_preferred_height not implemented for `%s'", 
 	       g_type_name (G_TYPE_FROM_INSTANCE (area)));
@@ -597,6 +624,7 @@ gtk_cell_area_get_preferred_height (GtkCellArea        *area,
 
 void
 gtk_cell_area_get_preferred_width_for_height (GtkCellArea        *area,
+					      GtkCellAreaIter    *iter,
 					      GtkWidget          *widget,
 					      gint                height,
 					      gint               *minimum_width,
@@ -608,7 +636,7 @@ gtk_cell_area_get_preferred_width_for_height (GtkCellArea        *area,
   g_return_if_fail (GTK_IS_WIDGET (widget));
 
   class = GTK_CELL_AREA_GET_CLASS (area);
-  class->get_preferred_width_for_height (area, widget, height, minimum_width, natural_width);
+  class->get_preferred_width_for_height (area, iter, widget, height, minimum_width, natural_width);
 }
 
 void

gtk/gtkcellarea.h

@@ -31,6 +31,7 @@
 #include <gtk/gtkcellrenderer.h>
 #include <gtk/gtkwidget.h>
 #include <gtk/gtktreemodel.h>
+#include <gtk/gtkcellareaiter.h>
 
 G_BEGIN_DECLS
 
@@ -88,21 +89,26 @@ struct _GtkCellAreaClass
 							  const GdkRectangle      *cell_area);
 
   /* Geometry */
+  GtkCellAreaIter   *(* create_iter)                     (GtkCellArea             *area);
   GtkSizeRequestMode (* get_request_mode)                (GtkCellArea             *area);
   void               (* get_preferred_width)             (GtkCellArea             *area,
+							  GtkCellAreaIter         *iter,
                                                           GtkWidget               *widget,
                                                           gint                    *minimum_size,
                                                           gint                    *natural_size);
   void               (* get_preferred_height_for_width)  (GtkCellArea             *area,
+							  GtkCellAreaIter         *iter,
                                                           GtkWidget               *widget,
                                                           gint                     width,
                                                           gint                    *minimum_height,
                                                           gint                    *natural_height);
   void               (* get_preferred_height)            (GtkCellArea             *area,
+							  GtkCellAreaIter         *iter,
                                                           GtkWidget               *widget,
                                                           gint                    *minimum_size,
                                                           gint                    *natural_size);
   void               (* get_preferred_width_for_height)  (GtkCellArea             *area,
+							  GtkCellAreaIter         *iter,
                                                           GtkWidget               *widget,
                                                           gint                     height,
                                                           gint                    *minimum_width,
@@ -140,21 +146,26 @@ void               gtk_cell_area_render                         (GtkCellArea
 								 const GdkRectangle *cell_area);
 
 /* Geometry */
+GtkCellAreaIter   *gtk_cell_area_create_iter                    (GtkCellArea        *area);
 GtkSizeRequestMode gtk_cell_area_get_request_mode               (GtkCellArea        *area);
 void               gtk_cell_area_get_preferred_width            (GtkCellArea        *area,
+								 GtkCellAreaIter    *iter,
 								 GtkWidget          *widget,
 								 gint               *minimum_size,
 								 gint               *natural_size);
 void               gtk_cell_area_get_preferred_height_for_width (GtkCellArea        *area,
+								 GtkCellAreaIter    *iter,
 								 GtkWidget          *widget,
 								 gint                width,
 								 gint               *minimum_height,
 								 gint               *natural_height);
 void               gtk_cell_area_get_preferred_height           (GtkCellArea        *area,
+								 GtkCellAreaIter    *iter,
 								 GtkWidget          *widget,
 								 gint               *minimum_size,
 								 gint               *natural_size);
 void               gtk_cell_area_get_preferred_width_for_height (GtkCellArea        *area,
+								 GtkCellAreaIter    *iter,
 								 GtkWidget          *widget,
 								 gint                height,
 								 gint               *minimum_width,

gtk/gtkcellareabox.c

@@ -1,4 +1,4 @@
-/* gtkcellarea.c
+/* gtkcellareabox.c
  *
  * Copyright (C) 2010 Openismus GmbH
  *
@@ -54,21 +54,26 @@ static void      gtk_cell_area_box_render                         (GtkCellArea
 								   GtkWidget          *widget,
 								   const GdkRectangle *cell_area);
 
+static GtkCellAreaIter    *gtk_cell_area_box_create_iter          (GtkCellArea        *area);
 static GtkSizeRequestMode  gtk_cell_area_box_get_request_mode     (GtkCellArea        *area);
 static void      gtk_cell_area_box_get_preferred_width            (GtkCellArea        *area,
+								   GtkCellAreaIter    *iter,
 								   GtkWidget          *widget,
 								   gint               *minimum_width,
 								   gint               *natural_width);
 static void      gtk_cell_area_box_get_preferred_height           (GtkCellArea        *area,
+								   GtkCellAreaIter    *iter,
 								   GtkWidget          *widget,
 								   gint               *minimum_height,
 								   gint               *natural_height);
 static void      gtk_cell_area_box_get_preferred_height_for_width (GtkCellArea        *area,
+								   GtkCellAreaIter    *iter,
 								   GtkWidget          *widget,
 								   gint                width,
 								   gint               *minimum_height,
 								   gint               *natural_height);
 static void      gtk_cell_area_box_get_preferred_width_for_height (GtkCellArea        *area,
+								   GtkCellAreaIter    *iter,
 								   GtkWidget          *widget,
 								   gint                height,
 								   gint               *minimum_width,
@@ -153,6 +158,7 @@ gtk_cell_area_box_class_init (GtkCellAreaBoxClass *class)
   area_class->event                          = gtk_cell_area_box_event;
   area_class->render                         = gtk_cell_area_box_render;
   
+  area_class->create_iter                    = gtk_cell_area_box_create_iter;
   area_class->get_request_mode               = gtk_cell_area_box_get_request_mode;
   area_class->get_preferred_width            = gtk_cell_area_box_get_preferred_width;
   area_class->get_preferred_height           = gtk_cell_area_box_get_preferred_height;
@@ -302,6 +308,12 @@ gtk_cell_area_box_render (GtkCellArea        *area,
 
 }
 
+static GtkCellAreaIter *
+gtk_cell_area_box_create_iter (GtkCellArea *area)
+{
+  return NULL;
+}
+
 static GtkSizeRequestMode 
 gtk_cell_area_box_get_request_mode (GtkCellArea *area)
 {
@@ -315,6 +327,7 @@ gtk_cell_area_box_get_request_mode (GtkCellArea *area)
 
 static void
 gtk_cell_area_box_get_preferred_width (GtkCellArea        *area,
+				       GtkCellAreaIter    *iter,
 				       GtkWidget          *widget,
 				       gint               *minimum_width,
 				       gint               *natural_width)
@@ -324,6 +337,7 @@ gtk_cell_area_box_get_preferred_width (GtkCellArea        *area,
 
 static void
 gtk_cell_area_box_get_preferred_height (GtkCellArea        *area,
+					GtkCellAreaIter    *iter,
 					GtkWidget          *widget,
 					gint               *minimum_height,
 					gint               *natural_height)
@@ -334,6 +348,7 @@ gtk_cell_area_box_get_preferred_height (GtkCellArea        *area,
 
 static void
 gtk_cell_area_box_get_preferred_height_for_width (GtkCellArea        *area,
+						  GtkCellAreaIter    *iter,
 						  GtkWidget          *widget,
 						  gint                width,
 						  gint               *minimum_height,
@@ -344,6 +359,7 @@ gtk_cell_area_box_get_preferred_height_for_width (GtkCellArea        *area,
 
 static void
 gtk_cell_area_box_get_preferred_width_for_height (GtkCellArea        *area,
+						  GtkCellAreaIter    *iter,
 						  GtkWidget          *widget,
 						  gint                height,
 						  gint               *minimum_width,
@@ -353,7 +369,6 @@ gtk_cell_area_box_get_preferred_width_for_height (GtkCellArea        *area,
 }
 
 
-
 /*************************************************************
  *                    GtkCellLayoutIface                     *
  *************************************************************/

gtk/gtkcellareaiter.c

@@ -0,0 +1,607 @@
+/* gtkcellareaiter.c
+ *
+ * Copyright (C) 2010 Openismus GmbH
+ *
+ * Authors:
+ *      Tristan Van Berkom <tristanvb@openismus.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include "config.h"
+#include "gtkintl.h"
+#include "gtkmarshalers.h"
+#include "gtkorientable.h"
+#include "gtkcelllayout.h"
+#include "gtkcellareaiter.h"
+
+/* GObjectClass */
+static void      gtk_cell_area_iter_finalize                       (GObject            *object);
+static void      gtk_cell_area_iter_get_property                   (GObject           *object,
+								   guint               prop_id,
+								   GValue             *value,
+								   GParamSpec         *pspec);
+
+/* GtkCellAreaIterClass */
+static void      gtk_cell_area_iter_real_flush_preferred_width            (GtkCellAreaIter *iter);
+static void      gtk_cell_area_iter_real_flush_preferred_height_for_width (GtkCellAreaIter *iter,
+									   gint             width);
+static void      gtk_cell_area_iter_real_flush_preferred_height           (GtkCellAreaIter *iter);
+static void      gtk_cell_area_iter_real_flush_preferred_width_for_height (GtkCellAreaIter *iter,
+									   gint             height);
+
+/* CachedSize management */
+typedef struct {
+  gint min_size;
+  gint nat_size;
+} CachedSize;
+
+static CachedSize *cached_size_new  (gint min_size, gint nat_size);
+static void        cached_size_free (CachedSize *size);
+
+struct _GtkCellAreaIterPrivate
+{
+  gint        min_width;
+  gint        nat_width;
+  gint        min_height;
+  gint        nat_height;
+
+  GHashTable *widths;
+  GHashTable *heights;
+};
+
+enum {
+  PROP_0,
+  PROP_MIN_WIDTH,
+  PROP_NAT_WIDTH,
+  PROP_MIN_HEIGHT,
+  PROP_NAT_HEIGHT
+};
+
+enum {
+  SIGNAL_WIDTH_CHANGED,
+  SIGNAL_HEIGHT_CHANGED,
+  LAST_SIGNAL
+};
+
+static guint cell_area_iter_signals[LAST_SIGNAL] = { 0 };
+
+G_DEFINE_TYPE (GtkCellAreaIter, gtk_cell_area_iter, G_TYPE_OBJECT);
+
+static void
+gtk_cell_area_iter_init (GtkCellAreaIter *iter)
+{
+  GtkCellAreaIterPrivate *priv;
+
+  iter->priv = G_TYPE_INSTANCE_GET_PRIVATE (iter,
+					    GTK_TYPE_CELL_AREA_ITER,
+					    GtkCellAreaIterPrivate);
+  priv = iter->priv;
+
+  priv->min_width  = -1;
+  priv->nat_width  = -1;
+  priv->min_height = -1;
+  priv->nat_height = -1;
+  priv->widths     = g_hash_table_new_full (g_direct_hash, g_direct_equal,
+					    NULL, (GDestroyNotify)cached_size_free);
+  priv->heights    = g_hash_table_new_full (g_direct_hash, g_direct_equal,
+					    NULL, (GDestroyNotify)cached_size_free);
+}
+
+static void 
+gtk_cell_area_iter_class_init (GtkCellAreaIterClass *class)
+{
+  GObjectClass     *object_class = G_OBJECT_CLASS (class);
+
+  /* GObjectClass */
+  object_class->finalize     = gtk_cell_area_iter_finalize;
+  object_class->get_property = gtk_cell_area_iter_get_property;
+
+  class->flush_preferred_width            = gtk_cell_area_iter_real_flush_preferred_width;
+  class->flush_preferred_height_for_width = gtk_cell_area_iter_real_flush_preferred_height_for_width;
+  class->flush_preferred_height           = gtk_cell_area_iter_real_flush_preferred_height;
+  class->flush_preferred_width_for_height = gtk_cell_area_iter_real_flush_preferred_width_for_height;
+
+  cell_area_iter_signals[SIGNAL_HEIGHT_CHANGED] =
+    g_signal_new (I_("height-changed"),
+		  G_TYPE_FROM_CLASS (object_class),
+		  G_SIGNAL_RUN_LAST,
+		  0, /* Class offset (just a notification, no class handler) */
+		  NULL, NULL,
+		  _gtk_marshal_VOID__INT_INT_INT,
+		  G_TYPE_NONE, 3,
+		  G_TYPE_INT, G_TYPE_INT, G_TYPE_INT);
+
+  cell_area_iter_signals[SIGNAL_WIDTH_CHANGED] =
+    g_signal_new (I_("width-changed"),
+		  G_TYPE_FROM_CLASS (object_class),
+		  G_SIGNAL_RUN_LAST,
+		  0, /* Class offset (just a notification, no class handler) */
+		  NULL, NULL,
+		  _gtk_marshal_VOID__INT_INT_INT,
+		  G_TYPE_NONE, 3,
+		  G_TYPE_INT, G_TYPE_INT, G_TYPE_INT);
+
+  g_object_class_install_property (object_class,
+                                   PROP_MIN_WIDTH,
+                                   g_param_spec_int ("minimum-width",
+						     P_("Minimum Width"),
+						     P_("Minimum cached width"),
+						     -1,
+						     G_MAXINT,
+						     -1,
+						     G_PARAM_READABLE));
+
+  g_object_class_install_property (object_class,
+                                   PROP_NAT_WIDTH,
+                                   g_param_spec_int ("natural-width",
+						     P_("Minimum Width"),
+						     P_("Minimum cached width"),
+						     -1,
+						     G_MAXINT,
+						     -1,
+						     G_PARAM_READABLE));
+
+  g_object_class_install_property (object_class,
+                                   PROP_MIN_HEIGHT,
+                                   g_param_spec_int ("minimum-height",
+						     P_("Minimum Height"),
+						     P_("Minimum cached height"),
+						     -1,
+						     G_MAXINT,
+						     -1,
+						     G_PARAM_READABLE));
+
+  g_object_class_install_property (object_class,
+                                   PROP_NAT_HEIGHT,
+                                   g_param_spec_int ("natural-height",
+						     P_("Minimum Height"),
+						     P_("Minimum cached height"),
+						     -1,
+						     G_MAXINT,
+						     -1,
+						     G_PARAM_READABLE));
+
+  g_type_class_add_private (object_class, sizeof (GtkCellAreaIterPrivate));
+}
+
+
+
+/*************************************************************
+ *                      Cached Sizes                         *
+ *************************************************************/
+static CachedSize *
+cached_size_new (gint min_size, 
+		 gint nat_size)
+{
+  CachedSize *size = g_slice_new (CachedSize);
+
+  size->min_size = min_size;
+  size->nat_size = nat_size;
+
+  return size;
+}
+
+static void
+cached_size_free (CachedSize *size)
+{
+  g_slice_free (CachedSize, size);
+}
+
+/*************************************************************
+ *                      GObjectClass                         *
+ *************************************************************/
+static void
+gtk_cell_area_iter_finalize (GObject *object)
+{
+  GtkCellAreaIter        *iter = GTK_CELL_AREA_ITER (object);
+  GtkCellAreaIterPrivate *priv = iter->priv;
+
+  g_hash_table_destroy (priv->widths);
+  g_hash_table_destroy (priv->heights);
+
+  G_OBJECT_CLASS (gtk_cell_area_iter_parent_class)->finalize (object);
+}
+
+static void
+gtk_cell_area_iter_get_property (GObject     *object,
+				 guint        prop_id,
+				 GValue      *value,
+				 GParamSpec  *pspec)
+{
+  GtkCellAreaIter        *iter = GTK_CELL_AREA_ITER (object);
+  GtkCellAreaIterPrivate *priv = iter->priv;
+
+  switch (prop_id)
+    {
+    case PROP_MIN_WIDTH:
+      g_value_set_int (value, priv->min_width);
+      break;
+    case PROP_NAT_WIDTH:
+      g_value_set_int (value, priv->nat_width);
+      break;
+    case PROP_MIN_HEIGHT:
+      g_value_set_int (value, priv->min_height);
+      break;
+    case PROP_NAT_HEIGHT:
+      g_value_set_int (value, priv->nat_height);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+    }
+}
+
+/*************************************************************
+ *                    GtkCellAreaIterClass                   *
+ *************************************************************/
+static void
+gtk_cell_area_iter_real_flush_preferred_width (GtkCellAreaIter *iter)
+{
+  GtkCellAreaIterPrivate *priv = iter->priv;
+  
+  priv->min_width = -1;
+  priv->nat_width = -1;
+
+  g_object_freeze_notify (G_OBJECT (iter));
+  g_object_notify (G_OBJECT (iter), "minimum-width");
+  g_object_notify (G_OBJECT (iter), "natural-width");
+  g_object_thaw_notify (G_OBJECT (iter));
+}
+
+static void
+gtk_cell_area_iter_real_flush_preferred_height_for_width (GtkCellAreaIter *iter,
+							  gint             width)
+{
+  GtkCellAreaIterPrivate *priv = iter->priv;
+
+  /* Flush all sizes for special -1 value */
+  if (width < 0)
+    g_hash_table_remove_all (priv->heights);
+  else
+    g_hash_table_remove (priv->heights, GINT_TO_POINTER (width));
+
+  /* XXX Should we bother signalling removed values as "size-changed" signals ? */
+}
+
+static void
+gtk_cell_area_iter_real_flush_preferred_height (GtkCellAreaIter *iter)
+{
+  GtkCellAreaIterPrivate *priv = iter->priv;
+  
+  priv->min_height = -1;
+  priv->nat_height = -1;
+
+  g_object_freeze_notify (G_OBJECT (iter));
+  g_object_notify (G_OBJECT (iter), "minimum-height");
+  g_object_notify (G_OBJECT (iter), "natural-height");
+  g_object_thaw_notify (G_OBJECT (iter));
+}
+
+static void
+gtk_cell_area_iter_real_flush_preferred_width_for_height (GtkCellAreaIter *iter,
+							  gint             height)
+{
+  GtkCellAreaIterPrivate *priv = iter->priv;
+
+  /* Flush all sizes for special -1 value */
+  if (height < 0)
+    g_hash_table_remove_all (priv->widths);
+  else
+    g_hash_table_remove (priv->widths, GINT_TO_POINTER (height));
+
+  /* XXX Should we bother signalling removed values as "size-changed" signals ? */
+}
+
+/*************************************************************
+ *                            API                            *
+ *************************************************************/
+
+void
+gtk_cell_area_iter_get_preferred_width (GtkCellAreaIter *iter,
+					gint            *minimum_width,
+					gint            *natural_width)
+{
+  GtkCellAreaIterPrivate *priv;
+
+  g_return_if_fail (GTK_IS_CELL_AREA_ITER (iter));
+
+  priv = iter->priv;
+
+  if (minimum_width)
+    *minimum_width = priv->min_width;
+
+  if (natural_width)
+    *natural_width = priv->nat_width;
+}
+
+void
+gtk_cell_area_iter_get_preferred_height_for_width (GtkCellAreaIter *iter,
+						   gint             for_width,
+						   gint            *minimum_height,
+						   gint            *natural_height)
+{
+  GtkCellAreaIterPrivate *priv;
+  CachedSize             *size;
+
+  g_return_if_fail (GTK_IS_CELL_AREA_ITER (iter));
+
+  priv = iter->priv;
+
+  size = g_hash_table_lookup (priv->heights, GINT_TO_POINTER (for_width));
+
+  if (size)
+    {
+      if (minimum_height)
+	*minimum_height = size->min_size;
+
+      if (natural_height)
+	*natural_height = size->nat_size;
+    }
+  else
+    {
+      if (minimum_height)
+	*minimum_height = -1;
+
+      if (natural_height)
+	*natural_height = -1;
+    }
+}
+
+void
+gtk_cell_area_iter_get_preferred_height (GtkCellAreaIter *iter,
+					 gint            *minimum_height,
+					 gint            *natural_height)
+{
+  GtkCellAreaIterPrivate *priv;
+
+  g_return_if_fail (GTK_IS_CELL_AREA_ITER (iter));
+
+  priv = iter->priv;
+
+  if (minimum_height)
+    *minimum_height = priv->min_height;
+
+  if (natural_height)
+    *natural_height = priv->nat_height;
+}
+
+void
+gtk_cell_area_iter_get_preferred_width_for_height (GtkCellAreaIter *iter,
+						   gint             for_height,
+						   gint            *minimum_width,
+						   gint            *natural_width)
+{
+  GtkCellAreaIterPrivate *priv;
+  CachedSize             *size;
+
+  g_return_if_fail (GTK_IS_CELL_AREA_ITER (iter));
+
+  priv = iter->priv;
+
+  size = g_hash_table_lookup (priv->widths, GINT_TO_POINTER (for_height));
+
+  if (size)
+    {
+      if (minimum_width)
+	*minimum_width = size->min_size;
+
+      if (natural_width)
+	*natural_width = size->nat_size;
+    }
+  else
+    {
+      if (minimum_width)
+	*minimum_width = -1;
+
+      if (natural_width)
+	*natural_width = -1;
+    }
+}
+
+
+void
+gtk_cell_area_iter_push_preferred_width (GtkCellAreaIter *iter,
+					 gint             minimum_width,
+					 gint             natural_width)
+{
+  GtkCellAreaIterPrivate *priv;
+
+  g_return_if_fail (GTK_IS_CELL_AREA_ITER (iter));
+
+  priv = iter->priv;
+
+  g_object_freeze_notify (G_OBJECT (iter));
+
+  if (minimum_width > priv->min_width)
+    {
+      priv->min_width = minimum_width;
+
+      g_object_notify (G_OBJECT (iter), "minimum-width");
+    }
+
+  if (natural_width > priv->nat_width)
+    {
+      priv->nat_width = natural_width;
+
+      g_object_notify (G_OBJECT (iter), "natural-width");
+    }
+
+  g_object_thaw_notify (G_OBJECT (iter));
+}
+
+void
+gtk_cell_area_iter_push_preferred_height_for_width (GtkCellAreaIter *iter,
+						    gint             for_width,
+						    gint             minimum_height,
+						    gint             natural_height)
+{
+  GtkCellAreaIterPrivate *priv;
+  CachedSize             *size;
+  gboolean                changed = FALSE;
+
+  g_return_if_fail (GTK_IS_CELL_AREA_ITER (iter));
+
+  priv = iter->priv;
+
+  size = g_hash_table_lookup (priv->heights, GINT_TO_POINTER (for_width));
+
+  if (!size)
+    {
+      size = cached_size_new (minimum_height, natural_height);
+
+      g_hash_table_insert (priv->heights, GINT_TO_POINTER (for_width), size);
+
+      changed = TRUE;
+    }
+  else
+    {
+      if (minimum_height > size->min_size)
+	{
+	  size->min_size = minimum_height;
+	  changed = TRUE;
+	}
+
+      if (natural_height > size->nat_size)
+	{
+	  size->nat_size = natural_height;
+	  changed = TRUE;
+	}
+    }
+  
+  if (changed)
+    g_signal_emit (iter, cell_area_iter_signals[SIGNAL_HEIGHT_CHANGED], 0, 
+		   for_width, size->min_size, size->nat_size);
+}
+
+void
+gtk_cell_area_iter_push_preferred_height (GtkCellAreaIter *iter,
+					  gint             minimum_height,
+					  gint             natural_height)
+{
+  GtkCellAreaIterPrivate *priv;
+  
+  g_return_if_fail (GTK_IS_CELL_AREA_ITER (iter));
+
+  priv = iter->priv;
+
+  g_object_freeze_notify (G_OBJECT (iter));
+
+  if (minimum_height > priv->min_height)
+    {
+      priv->min_height = minimum_height;
+
+      g_object_notify (G_OBJECT (iter), "minimum-height");
+    }
+
+  if (natural_height > priv->nat_height)
+    {
+      priv->nat_height = natural_height;
+
+      g_object_notify (G_OBJECT (iter), "natural-height");
+    }
+
+  g_object_thaw_notify (G_OBJECT (iter));
+}
+
+void
+gtk_cell_area_iter_push_preferred_width_for_height (GtkCellAreaIter *iter,
+						    gint             for_height,
+						    gint             minimum_width,
+						    gint             natural_width)
+{
+  GtkCellAreaIterPrivate *priv;
+  CachedSize             *size;
+  gboolean                changed = FALSE;
+
+  g_return_if_fail (GTK_IS_CELL_AREA_ITER (iter));
+
+  priv = iter->priv;
+
+  size = g_hash_table_lookup (priv->widths, GINT_TO_POINTER (for_height));
+
+  if (!size)
+    {
+      size = cached_size_new (minimum_width, natural_width);
+
+      g_hash_table_insert (priv->widths, GINT_TO_POINTER (for_height), size);
+
+      changed = TRUE;
+    }
+  else
+    {
+      if (minimum_width > size->min_size)
+	{
+	  size->min_size = minimum_width;
+	  changed = TRUE;
+	}
+
+      if (natural_width > size->nat_size)
+	{
+	  size->nat_size = natural_width;
+	  changed = TRUE;
+	}
+    }
+  
+  if (changed)
+    g_signal_emit (iter, cell_area_iter_signals[SIGNAL_WIDTH_CHANGED], 0, 
+		   for_height, size->min_size, size->nat_size);
+}
+
+void
+gtk_cell_area_iter_flush (GtkCellAreaIter *iter)
+{
+  g_return_if_fail (GTK_IS_CELL_AREA_ITER (iter));
+
+  gtk_cell_area_iter_flush_preferred_width (iter);
+  gtk_cell_area_iter_flush_preferred_height_for_width (iter, -1);
+  gtk_cell_area_iter_flush_preferred_height (iter);
+  gtk_cell_area_iter_flush_preferred_width_for_height (iter, -1);
+}
+
+void
+gtk_cell_area_iter_flush_preferred_width (GtkCellAreaIter *iter)
+{
+  g_return_if_fail (GTK_IS_CELL_AREA_ITER (iter));
+
+  GTK_CELL_AREA_ITER_GET_CLASS (iter)->flush_preferred_width (iter);
+}
+
+void
+gtk_cell_area_iter_flush_preferred_height_for_width (GtkCellAreaIter *iter,
+						     gint             for_width)
+{
+  g_return_if_fail (GTK_IS_CELL_AREA_ITER (iter));
+
+  GTK_CELL_AREA_ITER_GET_CLASS (iter)->flush_preferred_height_for_width (iter, for_width);
+}
+
+void
+gtk_cell_area_iter_flush_preferred_height (GtkCellAreaIter *iter)
+{
+  g_return_if_fail (GTK_IS_CELL_AREA_ITER (iter));
+
+  GTK_CELL_AREA_ITER_GET_CLASS (iter)->flush_preferred_height (iter);
+}
+
+void
+gtk_cell_area_iter_flush_preferred_width_for_height (GtkCellAreaIter *iter,
+						     gint             for_height)
+{
+  g_return_if_fail (GTK_IS_CELL_AREA_ITER (iter));
+
+  GTK_CELL_AREA_ITER_GET_CLASS (iter)->flush_preferred_width_for_height (iter, for_height);
+}

gtk/gtkcellareaiter.h

@@ -0,0 +1,117 @@
+/* gtkcellareaiter.h
+ *
+ * Copyright (C) 2010 Openismus GmbH
+ *
+ * Authors:
+ *      Tristan Van Berkom <tristanvb@openismus.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#if !defined (__GTK_H_INSIDE__) && !defined (GTK_COMPILATION)
+#error "Only <gtk/gtk.h> can be included directly."
+#endif
+
+#ifndef __GTK_CELL_AREA_ITER_H__
+#define __GTK_CELL_AREA_ITER_H__
+
+#include <glib-object.h>
+
+G_BEGIN_DECLS
+
+#define GTK_TYPE_CELL_AREA_ITER		  (gtk_cell_area_iter_get_type ())
+#define GTK_CELL_AREA_ITER(obj)		  (G_TYPE_CHECK_INSTANCE_CAST ((obj), GTK_TYPE_CELL_AREA_ITER, GtkCellAreaIter))
+#define GTK_CELL_AREA_ITER_CLASS(klass)	  (G_TYPE_CHECK_CLASS_CAST ((klass), GTK_TYPE_CELL_AREA_ITER, GtkCellAreaIterClass))
+#define GTK_IS_CELL_AREA_ITER(obj)	  (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GTK_TYPE_CELL_AREA_ITER))
+#define GTK_IS_CELL_AREA_ITER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GTK_TYPE_CELL_AREA_ITER))
+#define GTK_CELL_AREA_ITER_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_CELL_AREA_ITER, GtkCellAreaIterClass))
+
+typedef struct _GtkCellAreaIter              GtkCellAreaIter;
+typedef struct _GtkCellAreaIterPrivate       GtkCellAreaIterPrivate;
+typedef struct _GtkCellAreaIterClass         GtkCellAreaIterClass;
+
+struct _GtkCellAreaIter
+{
+  GObject parent_instance;
+
+  GtkCellAreaIterPrivate *priv;
+};
+
+struct _GtkCellAreaIterClass
+{
+  GObjectClass parent_class;
+
+  /* Subclasses can use this to flush their alignments */
+  void    (* flush_preferred_width)              (GtkCellAreaIter *iter);
+  void    (* flush_preferred_height_for_width)   (GtkCellAreaIter *iter,
+						  gint             width);
+  void    (* flush_preferred_height)             (GtkCellAreaIter *iter);
+  void    (* flush_preferred_width_for_height)   (GtkCellAreaIter *iter,
+						  gint             height);
+
+  /* Padding for future expansion */
+  void (*_gtk_reserved1) (void);
+  void (*_gtk_reserved2) (void);
+  void (*_gtk_reserved3) (void);
+  void (*_gtk_reserved4) (void);
+};
+
+GType   gtk_cell_area_iter_get_type                           (void) G_GNUC_CONST;
+
+/* Apis for GtkCellArea clients to consult cached values for multiple GtkTreeModel rows */
+void    gtk_cell_area_iter_get_preferred_width                (GtkCellAreaIter *iter,
+							       gint            *minimum_width,
+							       gint            *natural_width);
+void    gtk_cell_area_iter_get_preferred_height_for_width     (GtkCellAreaIter *iter,
+							       gint             for_width,
+							       gint            *minimum_height,
+							       gint            *natural_height);
+void    gtk_cell_area_iter_get_preferred_height               (GtkCellAreaIter *iter,
+							       gint            *minimum_height,
+							       gint            *natural_height);
+void    gtk_cell_area_iter_get_preferred_width_for_height     (GtkCellAreaIter *iter,
+							       gint             for_height,
+							       gint            *minimum_width,
+							       gint            *natural_width);
+
+/* Apis for GtkCellArea implementations to update cached values for multiple GtkTreeModel rows */
+void    gtk_cell_area_iter_push_preferred_width               (GtkCellAreaIter *iter,
+							       gint             minimum_width,
+							       gint             natural_width);
+void    gtk_cell_area_iter_push_preferred_height_for_width    (GtkCellAreaIter *iter,
+							       gint             for_width,
+							       gint             minimum_height,
+							       gint             natural_height);
+void    gtk_cell_area_iter_push_preferred_height              (GtkCellAreaIter *iter,
+							       gint             minimum_height,
+							       gint             natural_height);
+void    gtk_cell_area_iter_push_preferred_width_for_height    (GtkCellAreaIter *iter,
+							       gint             for_height,
+							       gint             minimum_width,
+							       gint             natural_width);
+
+/* Apis for GtkCellArea clients to flush the cache */
+void    gtk_cell_area_iter_flush                              (GtkCellAreaIter *iter);
+void    gtk_cell_area_iter_flush_preferred_width              (GtkCellAreaIter *iter);
+void    gtk_cell_area_iter_flush_preferred_height_for_width   (GtkCellAreaIter *iter,
+							       gint             for_width);
+void    gtk_cell_area_iter_flush_preferred_height             (GtkCellAreaIter *iter);
+void    gtk_cell_area_iter_flush_preferred_width_for_height   (GtkCellAreaIter *iter,
+							       gint             for_height);
+
+G_END_DECLS
+
+#endif /* __GTK_CELL_AREA_ITER_H__ */