gtkgrid.c 71.2 KB
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/* GTK - The GIMP Toolkit
 * Copyright (C) 2010 Red Hat, Inc.
 * Author: Matthias Clasen
 *
 * 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 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
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 * License along with this library. If not, see <http://www.gnu.org/licenses/>.
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 */

#include "config.h"

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#include <string.h>

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#include "gtkgrid.h"

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#include "gtkorientableprivate.h"
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#include "gtkrender.h"
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#include "gtksizerequest.h"
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#include "gtkwidgetprivate.h"
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#include "gtkcontainerprivate.h"
#include "gtkcsscustomgadgetprivate.h"
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#include "gtkprivate.h"
#include "gtkintl.h"


/**
 * SECTION:gtkgrid
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 * @Short_description: Pack widgets in rows and columns
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 * @Title: GtkGrid
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 * @See_also: #GtkBox
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 *
 * GtkGrid is a container which arranges its child widgets in
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 * rows and columns, with arbitrary positions and horizontal/vertical spans.
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 *
 * Children are added using gtk_grid_attach(). They can span multiple
 * rows or columns. It is also possible to add a child next to an
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 * existing child, using gtk_grid_attach_next_to(). The behaviour of
 * GtkGrid when several children occupy the same grid cell is undefined.
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 *
 * GtkGrid can be used like a #GtkBox by just using gtk_container_add(),
 * which will place children next to each other in the direction determined
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 * by the #GtkOrientable:orientation property. However, if all you want is a
 * single row or column, then #GtkBox is the preferred widget.
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 *
 * # CSS nodes
 *
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 * GtkGrid uses a single CSS node with name grid.
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 */

typedef struct _GtkGridChild GtkGridChild;
typedef struct _GtkGridChildAttach GtkGridChildAttach;
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typedef struct _GtkGridRowProperties GtkGridRowProperties;
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typedef struct _GtkGridLine GtkGridLine;
typedef struct _GtkGridLines GtkGridLines;
typedef struct _GtkGridLineData GtkGridLineData;
typedef struct _GtkGridRequest GtkGridRequest;

struct _GtkGridChildAttach
{
  gint pos;
  gint span;
};

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struct _GtkGridRowProperties
{
  gint row;
  GtkBaselinePosition baseline_position;
};

static const GtkGridRowProperties gtk_grid_row_properties_default = {
  0,
  GTK_BASELINE_POSITION_CENTER
};

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struct _GtkGridChild
{
  GtkWidget *widget;
  GtkGridChildAttach attach[2];
};

#define CHILD_LEFT(child)    ((child)->attach[GTK_ORIENTATION_HORIZONTAL].pos)
#define CHILD_WIDTH(child)   ((child)->attach[GTK_ORIENTATION_HORIZONTAL].span)
#define CHILD_TOP(child)     ((child)->attach[GTK_ORIENTATION_VERTICAL].pos)
#define CHILD_HEIGHT(child)  ((child)->attach[GTK_ORIENTATION_VERTICAL].span)

/* A GtkGridLineData struct contains row/column specific parts
 * of the grid.
 */
struct _GtkGridLineData
{
  gint16 spacing;
  guint homogeneous : 1;
};

struct _GtkGridPrivate
{
  GList *children;
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  GList *row_properties;
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  GtkCssGadget *gadget;

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  GtkOrientation orientation;
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  gint baseline_row;
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  GtkGridLineData linedata[2];
};

#define ROWS(priv)    (&(priv)->linedata[GTK_ORIENTATION_HORIZONTAL])
#define COLUMNS(priv) (&(priv)->linedata[GTK_ORIENTATION_VERTICAL])

/* A GtkGridLine struct represents a single row or column
 * during size requests
 */
struct _GtkGridLine
{
  gint minimum;
  gint natural;
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  gint minimum_above;
  gint minimum_below;
  gint natural_above;
  gint natural_below;

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  gint position;
  gint allocation;
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  gint allocated_baseline;
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  guint need_expand : 1;
  guint expand      : 1;
  guint empty       : 1;
};

struct _GtkGridLines
{
  GtkGridLine *lines;
  gint min, max;
};

struct _GtkGridRequest
{
  GtkGrid *grid;
  GtkGridLines lines[2];
};


enum
{
  PROP_0,
  PROP_ROW_SPACING,
  PROP_COLUMN_SPACING,
  PROP_ROW_HOMOGENEOUS,
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  PROP_COLUMN_HOMOGENEOUS,
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  PROP_BASELINE_ROW,
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  N_PROPERTIES,
  PROP_ORIENTATION
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};

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static GParamSpec *obj_properties[N_PROPERTIES] = { NULL, };

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enum
{
  CHILD_PROP_0,
  CHILD_PROP_LEFT_ATTACH,
  CHILD_PROP_TOP_ATTACH,
  CHILD_PROP_WIDTH,
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  CHILD_PROP_HEIGHT,
  N_CHILD_PROPERTIES
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};

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static GParamSpec *child_properties[N_CHILD_PROPERTIES] = { NULL, };

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G_DEFINE_TYPE_WITH_CODE (GtkGrid, gtk_grid, GTK_TYPE_CONTAINER,
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                         G_ADD_PRIVATE (GtkGrid)
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                         G_IMPLEMENT_INTERFACE (GTK_TYPE_ORIENTABLE, NULL))


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static void gtk_grid_row_properties_free (GtkGridRowProperties *props);

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static void
gtk_grid_get_property (GObject    *object,
                       guint       prop_id,
                       GValue     *value,
                       GParamSpec *pspec)
{
  GtkGrid *grid = GTK_GRID (object);
  GtkGridPrivate *priv = grid->priv;

  switch (prop_id)
    {
    case PROP_ORIENTATION:
      g_value_set_enum (value, priv->orientation);
      break;

    case PROP_ROW_SPACING:
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      g_value_set_int (value, COLUMNS (priv)->spacing);
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      break;

    case PROP_COLUMN_SPACING:
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      g_value_set_int (value, ROWS (priv)->spacing);
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      break;

    case PROP_ROW_HOMOGENEOUS:
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      g_value_set_boolean (value, COLUMNS (priv)->homogeneous);
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      break;

    case PROP_COLUMN_HOMOGENEOUS:
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      g_value_set_boolean (value, ROWS (priv)->homogeneous);
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      break;

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    case PROP_BASELINE_ROW:
      g_value_set_int (value, priv->baseline_row);
      break;

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    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
    }
}

static void
gtk_grid_set_orientation (GtkGrid        *grid,
                          GtkOrientation  orientation)
{
  GtkGridPrivate *priv = grid->priv;

  if (priv->orientation != orientation)
    {
      priv->orientation = orientation;
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      _gtk_orientable_set_style_classes (GTK_ORIENTABLE (grid));
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      g_object_notify (G_OBJECT (grid), "orientation");
    }
}

static void
gtk_grid_set_property (GObject      *object,
                       guint         prop_id,
                       const GValue *value,
                       GParamSpec   *pspec)
{
  GtkGrid *grid = GTK_GRID (object);

  switch (prop_id)
    {
    case PROP_ORIENTATION:
      gtk_grid_set_orientation (grid, g_value_get_enum (value));
      break;

    case PROP_ROW_SPACING:
      gtk_grid_set_row_spacing (grid, g_value_get_int (value));
      break;

    case PROP_COLUMN_SPACING:
      gtk_grid_set_column_spacing (grid, g_value_get_int (value));
      break;

    case PROP_ROW_HOMOGENEOUS:
      gtk_grid_set_row_homogeneous (grid, g_value_get_boolean (value));
      break;

    case PROP_COLUMN_HOMOGENEOUS:
      gtk_grid_set_column_homogeneous (grid, g_value_get_boolean (value));
      break;

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    case PROP_BASELINE_ROW:
      gtk_grid_set_baseline_row (grid, g_value_get_int (value));
      break;

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    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
    }
}

static GtkGridChild *
find_grid_child (GtkGrid   *grid,
                 GtkWidget *widget)
{
  GtkGridPrivate *priv = grid->priv;
  GtkGridChild *child;
  GList *list;

  for (list = priv->children; list; list = list->next)
    {
      child = list->data;

      if (child->widget == widget)
        return child;
    }

  return NULL;
}

static void
gtk_grid_get_child_property (GtkContainer *container,
                             GtkWidget    *child,
                             guint         property_id,
                             GValue       *value,
                             GParamSpec   *pspec)
{
  GtkGrid *grid = GTK_GRID (container);
  GtkGridChild *grid_child;

  grid_child = find_grid_child (grid, child);

  if (grid_child == NULL)
    {
      GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
      return;
    }

  switch (property_id)
    {
    case CHILD_PROP_LEFT_ATTACH:
      g_value_set_int (value, CHILD_LEFT (grid_child));
      break;

    case CHILD_PROP_TOP_ATTACH:
      g_value_set_int (value, CHILD_TOP (grid_child));
      break;

    case CHILD_PROP_WIDTH:
      g_value_set_int (value, CHILD_WIDTH (grid_child));
      break;

    case CHILD_PROP_HEIGHT:
      g_value_set_int (value, CHILD_HEIGHT (grid_child));
      break;

    default:
      GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
      break;
    }
}

static void
gtk_grid_set_child_property (GtkContainer *container,
                             GtkWidget    *child,
                             guint         property_id,
                             const GValue *value,
                             GParamSpec   *pspec)
{
  GtkGrid *grid = GTK_GRID (container);
  GtkGridChild *grid_child;

  grid_child = find_grid_child (grid, child);

  if (grid_child == NULL)
    {
      GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
      return;
    }

  switch (property_id)
    {
    case CHILD_PROP_LEFT_ATTACH:
      CHILD_LEFT (grid_child) = g_value_get_int (value);
      break;

    case CHILD_PROP_TOP_ATTACH:
      CHILD_TOP (grid_child) = g_value_get_int (value);
      break;

   case CHILD_PROP_WIDTH:
      CHILD_WIDTH (grid_child) = g_value_get_int (value);
      break;

    case CHILD_PROP_HEIGHT:
      CHILD_HEIGHT (grid_child) = g_value_get_int (value);
      break;

    default:
      GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
      break;
    }

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  if (_gtk_widget_get_visible (child) &&
      _gtk_widget_get_visible (GTK_WIDGET (grid)))
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    gtk_widget_queue_resize (child);
}

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static void
gtk_grid_finalize (GObject *object)
{
  GtkGrid *grid = GTK_GRID (object);
  GtkGridPrivate *priv = grid->priv;

  g_list_free_full (priv->row_properties, (GDestroyNotify)gtk_grid_row_properties_free);

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  g_clear_object (&priv->gadget);

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  G_OBJECT_CLASS (gtk_grid_parent_class)->finalize (object);
}

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static void
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grid_attach (GtkGrid   *grid,
             GtkWidget *widget,
             gint       left,
             gint       top,
             gint       width,
             gint       height)
{
  GtkGridPrivate *priv = grid->priv;
  GtkGridChild *child;

  child = g_slice_new (GtkGridChild);
  child->widget = widget;
  CHILD_LEFT (child) = left;
  CHILD_TOP (child) = top;
  CHILD_WIDTH (child) = width;
  CHILD_HEIGHT (child) = height;

  priv->children = g_list_prepend (priv->children, child);

  gtk_widget_set_parent (widget, GTK_WIDGET (grid));
}

/* Find the position 'touching' existing
 * children. @orientation and @max determine
 * from which direction to approach (horizontal
 * + max = right, vertical + !max = top, etc).
 * @op_pos, @op_span determine the rows/columns
 * in which the touching has to happen.
 */
static gint
find_attach_position (GtkGrid         *grid,
                      GtkOrientation   orientation,
                      gint             op_pos,
                      gint             op_span,
                      gboolean         max)
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{
  GtkGridPrivate *priv = grid->priv;
  GtkGridChild *grid_child;
  GtkGridChildAttach *attach;
  GtkGridChildAttach *opposite;
  GList *list;
  gint pos;
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  gboolean hit;

  if (max)
    pos = -G_MAXINT;
  else
    pos = G_MAXINT;

  hit = FALSE;
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  for (list = priv->children; list; list = list->next)
    {
      grid_child = list->data;

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      attach = &grid_child->attach[orientation];
      opposite = &grid_child->attach[1 - orientation];

      /* check if the ranges overlap */
      if (opposite->pos <= op_pos + op_span && op_pos <= opposite->pos + opposite->span)
        {
          hit = TRUE;
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          if (max)
            pos = MAX (pos, attach->pos + attach->span);
          else
            pos = MIN (pos, attach->pos);
        }
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     }

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  if (!hit)
    pos = 0;

  return pos;
}

static void
gtk_grid_add (GtkContainer *container,
              GtkWidget    *child)
{
  GtkGrid *grid = GTK_GRID (container);
  GtkGridPrivate *priv = grid->priv;
  gint pos[2] = { 0, 0 };

  pos[priv->orientation] = find_attach_position (grid, priv->orientation, 0, 1, TRUE);
  grid_attach (grid, child, pos[0], pos[1], 1, 1);
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}

static void
gtk_grid_remove (GtkContainer *container,
                 GtkWidget    *child)
{
  GtkGrid *grid = GTK_GRID (container);
  GtkGridPrivate *priv = grid->priv;
  GtkGridChild *grid_child;
  GList *list;

  for (list = priv->children; list; list = list->next)
    {
      grid_child = list->data;

      if (grid_child->widget == child)
        {
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          gboolean was_visible = _gtk_widget_get_visible (child);
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          gtk_widget_unparent (child);

          priv->children = g_list_remove (priv->children, grid_child);

          g_slice_free (GtkGridChild, grid_child);

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          if (was_visible && _gtk_widget_get_visible (GTK_WIDGET (grid)))
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            gtk_widget_queue_resize (GTK_WIDGET (grid));

          break;
        }
    }
}

static void
gtk_grid_forall (GtkContainer *container,
                 gboolean      include_internals,
                 GtkCallback   callback,
                 gpointer      callback_data)
{
  GtkGrid *grid = GTK_GRID (container);
  GtkGridPrivate *priv = grid->priv;
  GtkGridChild *child;
  GList *list;

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  list = priv->children;
  while (list)
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    {
      child = list->data;
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      list  = list->next;
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      (* callback) (child->widget, callback_data);
    }
}

static GType
gtk_grid_child_type (GtkContainer *container)
{
  return GTK_TYPE_WIDGET;
}

/* Calculates the min and max numbers for both orientations.
 */
static void
gtk_grid_request_count_lines (GtkGridRequest *request)
{
  GtkGridPrivate *priv = request->grid->priv;
  GtkGridChild *child;
  GtkGridChildAttach *attach;
  GList *list;
  gint min[2];
  gint max[2];

  min[0] = min[1] = G_MAXINT;
  max[0] = max[1] = G_MININT;

  for (list = priv->children; list; list = list->next)
    {
      child = list->data;
      attach = child->attach;

      min[0] = MIN (min[0], attach[0].pos);
      max[0] = MAX (max[0], attach[0].pos + attach[0].span);
      min[1] = MIN (min[1], attach[1].pos);
      max[1] = MAX (max[1], attach[1].pos + attach[1].span);
    }

  request->lines[0].min = min[0];
  request->lines[0].max = max[0];
  request->lines[1].min = min[1];
  request->lines[1].max = max[1];
}

/* Sets line sizes to 0 and marks lines as expand
 * if they have a non-spanning expanding child.
 */
static void
gtk_grid_request_init (GtkGridRequest *request,
                       GtkOrientation  orientation)
{
  GtkGridPrivate *priv = request->grid->priv;
  GtkGridChild *child;
  GtkGridChildAttach *attach;
  GtkGridLines *lines;
  GList *list;
  gint i;

  lines = &request->lines[orientation];

  for (i = 0; i < lines->max - lines->min; i++)
    {
      lines->lines[i].minimum = 0;
      lines->lines[i].natural = 0;
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      lines->lines[i].minimum_above = -1;
      lines->lines[i].minimum_below = -1;
      lines->lines[i].natural_above = -1;
      lines->lines[i].natural_below = -1;
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      lines->lines[i].expand = FALSE;
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      lines->lines[i].empty = TRUE;
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    }

  for (list = priv->children; list; list = list->next)
    {
      child = list->data;

      attach = &child->attach[orientation];
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      if (attach->span == 1 && gtk_widget_compute_expand (child->widget, orientation))
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        lines->lines[attach->pos - lines->min].expand = TRUE;
    }
}

/* Sums allocations for lines spanned by child and their spacing.
 */
static gint
compute_allocation_for_child (GtkGridRequest *request,
                              GtkGridChild   *child,
                              GtkOrientation  orientation)
{
  GtkGridPrivate *priv = request->grid->priv;
  GtkGridLineData *linedata;
  GtkGridLines *lines;
  GtkGridLine *line;
  GtkGridChildAttach *attach;
  gint size;
  gint i;

  linedata = &priv->linedata[orientation];
  lines = &request->lines[orientation];
  attach = &child->attach[orientation];

  size = (attach->span - 1) * linedata->spacing;
  for (i = 0; i < attach->span; i++)
    {
      line = &lines->lines[attach->pos - lines->min + i];
      size += line->allocation;
    }

  return size;
}

static void
compute_request_for_child (GtkGridRequest *request,
                           GtkGridChild   *child,
                           GtkOrientation  orientation,
                           gboolean        contextual,
                           gint           *minimum,
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                           gint           *natural,
			   gint           *minimum_baseline,
                           gint           *natural_baseline)
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{
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  if (minimum_baseline)
    *minimum_baseline = -1;
  if (natural_baseline)
    *natural_baseline = -1;
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  if (contextual)
    {
      gint size;

      size = compute_allocation_for_child (request, child, 1 - orientation);
      if (orientation == GTK_ORIENTATION_HORIZONTAL)
        gtk_widget_get_preferred_width_for_height (child->widget,
                                                   size,
                                                   minimum, natural);
      else
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        gtk_widget_get_preferred_height_and_baseline_for_width (child->widget,
								size,
								minimum, natural,
								minimum_baseline, natural_baseline);
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    }
  else
    {
      if (orientation == GTK_ORIENTATION_HORIZONTAL)
        gtk_widget_get_preferred_width (child->widget, minimum, natural);
      else
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        gtk_widget_get_preferred_height_and_baseline_for_width (child->widget,
								-1,
								minimum, natural,
								minimum_baseline, natural_baseline);
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    }
}

/* Sets requisition to max. of non-spanning children.
 * If contextual is TRUE, requires allocations of
 * lines in the opposite orientation to be set.
 */
static void
gtk_grid_request_non_spanning (GtkGridRequest *request,
                               GtkOrientation  orientation,
                               gboolean        contextual)
{
  GtkGridPrivate *priv = request->grid->priv;
  GtkGridChild *child;
  GtkGridChildAttach *attach;
  GtkGridLines *lines;
  GtkGridLine *line;
  GList *list;
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  gint i;
  GtkBaselinePosition baseline_pos;
  gint minimum, minimum_baseline;
  gint natural, natural_baseline;
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  lines = &request->lines[orientation];

  for (list = priv->children; list; list = list->next)
    {
      child = list->data;

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      if (!_gtk_widget_get_visible (child->widget))
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        continue;

      attach = &child->attach[orientation];
      if (attach->span != 1)
        continue;

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      compute_request_for_child (request, child, orientation, contextual, &minimum, &natural, &minimum_baseline, &natural_baseline);
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      line = &lines->lines[attach->pos - lines->min];
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      if (minimum_baseline != -1)
	{
	  line->minimum_above = MAX (line->minimum_above, minimum_baseline);
	  line->minimum_below = MAX (line->minimum_below, minimum - minimum_baseline);
	  line->natural_above = MAX (line->natural_above, natural_baseline);
	  line->natural_below = MAX (line->natural_below, natural - natural_baseline);
	}
      else
	{
	  line->minimum = MAX (line->minimum, minimum);
	  line->natural = MAX (line->natural, natural);
	}
    }

  for (i = 0; i < lines->max - lines->min; i++)
    {
      line = &lines->lines[i];

      if (line->minimum_above != -1)
	{
	  line->minimum = MAX (line->minimum, line->minimum_above + line->minimum_below);
	  line->natural = MAX (line->natural, line->natural_above + line->natural_below);

	  baseline_pos = gtk_grid_get_row_baseline_position (request->grid, i + lines->min);

	  switch (baseline_pos)
	    {
	    case GTK_BASELINE_POSITION_TOP:
	      line->minimum_above += 0;
	      line->minimum_below += line->minimum - (line->minimum_above + line->minimum_below);
	      line->natural_above += 0;
	      line->natural_below += line->natural - (line->natural_above + line->natural_below);
	      break;
	    case GTK_BASELINE_POSITION_CENTER:
	      line->minimum_above += (line->minimum - (line->minimum_above + line->minimum_below))/2;
	      line->minimum_below += (line->minimum - (line->minimum_above + line->minimum_below))/2;
	      line->natural_above += (line->natural - (line->natural_above + line->natural_below))/2;
	      line->natural_below += (line->natural - (line->natural_above + line->natural_below))/2;
	      break;
	    case GTK_BASELINE_POSITION_BOTTOM:
	      line->minimum_above += line->minimum - (line->minimum_above + line->minimum_below);
	      line->minimum_below += 0;
	      line->natural_above += line->natural - (line->natural_above + line->natural_below);
	      line->natural_below += 0;
	      break;
	    }
	}
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    }
}

/* Enforce homogeneous sizes.
 */
static void
gtk_grid_request_homogeneous (GtkGridRequest *request,
                              GtkOrientation  orientation)
{
  GtkGridPrivate *priv = request->grid->priv;
  GtkGridLineData *linedata;
  GtkGridLines *lines;
  gint minimum, natural;
  gint i;

  linedata = &priv->linedata[orientation];
  lines = &request->lines[orientation];

  if (!linedata->homogeneous)
    return;

  minimum = 0;
  natural = 0;

  for (i = 0; i < lines->max - lines->min; i++)
    {
      minimum = MAX (minimum, lines->lines[i].minimum);
      natural = MAX (natural, lines->lines[i].natural);
    }

  for (i = 0; i < lines->max - lines->min; i++)
    {
      lines->lines[i].minimum = minimum;
      lines->lines[i].natural = natural;
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      /* TODO: Do we want to adjust the baseline here too?
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       * And if so, also in the homogenous resize.
       */
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    }
}

/* Deals with spanning children.
 * Requires expand fields of lines to be set for
 * non-spanning children.
 */
static void
gtk_grid_request_spanning (GtkGridRequest *request,
                           GtkOrientation  orientation,
                           gboolean        contextual)
{
  GtkGridPrivate *priv = request->grid->priv;
  GList *list;
  GtkGridChild *child;
  GtkGridChildAttach *attach;
  GtkGridLineData *linedata;
  GtkGridLines *lines;
  GtkGridLine *line;
  gint minimum;
  gint natural;
  gint span_minimum;
  gint span_natural;
  gint span_expand;
  gboolean force_expand;
  gint extra;
  gint expand;
  gint line_extra;
  gint i;

  linedata = &priv->linedata[orientation];
  lines = &request->lines[orientation];

  for (list = priv->children; list; list = list->next)
    {
      child = list->data;

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      if (!_gtk_widget_get_visible (child->widget))
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        continue;

      attach = &child->attach[orientation];
      if (attach->span == 1)
        continue;

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      /* We ignore baselines for spanning children */
      compute_request_for_child (request, child, orientation, contextual, &minimum, &natural, NULL, NULL);
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      span_minimum = (attach->span - 1) * linedata->spacing;
      span_natural = (attach->span - 1) * linedata->spacing;
      span_expand = 0;
      force_expand = FALSE;
      for (i = 0; i < attach->span; i++)
        {
          line = &lines->lines[attach->pos - lines->min + i];
          span_minimum += line->minimum;
          span_natural += line->natural;
          if (line->expand)
            span_expand += 1;
        }
      if (span_expand == 0)
        {
          span_expand = attach->span;
          force_expand = TRUE;
        }

      /* If we need to request more space for this child to fill
       * its requisition, then divide up the needed space amongst the
       * lines it spans, favoring expandable lines if any.
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       *
       * When doing homogeneous allocation though, try to keep the
       * line allocations even, since we're going to force them to
       * be the same anyway, and we don't want to introduce unnecessary
       * extra space.
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       */
      if (span_minimum < minimum)
        {
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          if (linedata->homogeneous)
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            {
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              gint total, m;

              total = minimum - (attach->span - 1) * linedata->spacing;
              m = total / attach->span + (total % attach->span ? 1 : 0);
              for (i = 0; i < attach->span; i++)
                {
                  line = &lines->lines[attach->pos - lines->min + i];
                  line->minimum = MAX(line->minimum, m);
                }
            }
          else
            {
              extra = minimum - span_minimum;
              expand = span_expand;
              for (i = 0; i < attach->span; i++)
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                {
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                  line = &lines->lines[attach->pos - lines->min + i];
                  if (force_expand || line->expand)
                    {
                      line_extra = extra / expand;
                      line->minimum += line_extra;
                      extra -= line_extra;
                      expand -= 1;
                    }
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                }
            }
        }

      if (span_natural < natural)
        {
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          if (linedata->homogeneous)
            {
              gint total, n;

              total = natural - (attach->span - 1) * linedata->spacing;
              n = total / attach->span + (total % attach->span ? 1 : 0);
              for (i = 0; i < attach->span; i++)
                {
                  line = &lines->lines[attach->pos - lines->min + i];
                  line->natural = MAX(line->natural, n);
                }
            }
          else
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            {
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              extra = natural - span_natural;
              expand = span_expand;
              for (i = 0; i < attach->span; i++)
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                {
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                  line = &lines->lines[attach->pos - lines->min + i];
                  if (force_expand || line->expand)
                    {
                      line_extra = extra / expand;
                      line->natural += line_extra;
                      extra -= line_extra;
                      expand -= 1;
                    }
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                }
            }
        }
    }
}

/* Marks empty and expanding lines and counts them.
 */
static void
gtk_grid_request_compute_expand (GtkGridRequest *request,
                                 GtkOrientation  orientation,
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				 gint            min,
				 gint            max,
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                                 gint           *nonempty_lines,
                                 gint           *expand_lines)
{
  GtkGridPrivate *priv = request->grid->priv;
  GtkGridChild *child;
  GtkGridChildAttach *attach;
  GList *list;
  gint i;
  GtkGridLines *lines;
  GtkGridLine *line;
  gboolean has_expand;
  gint expand;
  gint empty;

  lines = &request->lines[orientation];

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  min = MAX (min, lines->min);
  max = MIN (max, lines->max);

  for (i = min - lines->min; i < max - lines->min; i++)
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    {
      lines->lines[i].need_expand = FALSE;
      lines->lines[i].expand = FALSE;
      lines->lines[i].empty = TRUE;
    }

  for (list = priv->children; list; list = list->next)
    {
      child = list->data;

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      if (!_gtk_widget_get_visible (child->widget))
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        continue;

      attach = &child->attach[orientation];
      if (attach->span != 1)
        continue;

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      if (attach->pos >= max || attach->pos < min)
	continue;

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      line = &lines->lines[attach->pos - lines->min];
      line->empty = FALSE;
      if (gtk_widget_compute_expand (child->widget, orientation))
        line->expand = TRUE;
    }

  for (list = priv->children; list; list = list->next)
    {
      child = list->data;

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      if (!_gtk_widget_get_visible (child->widget))
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        continue;

      attach = &child->attach[orientation];
      if (attach->span == 1)
        continue;

      has_expand = FALSE;
      for (i = 0; i < attach->span; i++)
        {
          line = &lines->lines[attach->pos - lines->min + i];
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          if (line->expand)
            has_expand = TRUE;

	  if (attach->pos + i >= max || attach->pos + 1 < min)
	    continue;

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          line->empty = FALSE;
        }

      if (!has_expand && gtk_widget_compute_expand (child->widget, orientation))
        {
          for (i = 0; i < attach->span; i++)
            {
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	      if (attach->pos + i >= max || attach->pos + 1 < min)
		continue;

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              line = &lines->lines[attach->pos - lines->min + i];
              line->need_expand = TRUE;
            }
        }
    }

  empty = 0;
  expand = 0;
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  for (i = min - lines->min; i < max - lines->min; i++)
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    {
      line = &lines->lines[i];

      if (line->need_expand)
        line->expand = TRUE;

      if (line->empty)
        empty += 1;

      if (line->expand)
        expand += 1;
    }

  if (nonempty_lines)
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    *nonempty_lines = max - min - empty;
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  if (expand_lines)
    *expand_lines = expand;
}

/* Sums the minimum and natural fields of lines and their spacing.
 */
static void
gtk_grid_request_sum (GtkGridRequest *request,
                      GtkOrientation  orientation,
                      gint           *minimum,
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                      gint           *natural,
		      gint           *minimum_baseline,
		      gint           *natural_baseline)
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{
  GtkGridPrivate *priv = request->grid->priv;
  GtkGridLineData *linedata;
  GtkGridLines *lines;
  gint i;
  gint min, nat;
  gint nonempty;

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  gtk_grid_request_compute_expand (request, orientation, G_MININT, G_MAXINT, &nonempty, NULL);
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  linedata = &priv->linedata[orientation];
  lines = &request->lines[orientation];

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  min = 0;
  nat = 0;
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  for (i = 0; i < lines->max - lines->min; i++)
    {
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      if (orientation == GTK_ORIENTATION_VERTICAL &&
	  lines->min + i == priv->baseline_row &&
	  lines->lines[i].minimum_above != -1)
	{
	  if (minimum_baseline)
	    *minimum_baseline = min + lines->lines[i].minimum_above;
	  if (natural_baseline)
	    *natural_baseline = nat + lines->lines[i].natural_above;
	}

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      min += lines->lines[i].minimum;
      nat += lines->lines[i].natural;
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      if (!lines->lines[i].empty)
	{
	  min += linedata->spacing;
	  nat += linedata->spacing;
	}
    }

  /* Remove last spacing, if any was applied */
  if (nonempty > 0)
    {
      min -= linedata->spacing;
      nat -= linedata->spacing;
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    }

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  *minimum = min;
  *natural = nat;
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}

/* Computes minimum and natural fields of lines.
 * When contextual is TRUE, requires allocation of
 * lines in the opposite orientation to be set.
 */
static void
gtk_grid_request_run (GtkGridRequest *request,
                      GtkOrientation  orientation,
                      gboolean        contextual)
{
  gtk_grid_request_init (request, orientation);
  gtk_grid_request_non_spanning (request, orientation, contextual);
  gtk_grid_request_homogeneous (request, orientation);
  gtk_grid_request_spanning (request, orientation, contextual);
  gtk_grid_request_homogeneous (request, orientation);
}

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static void
gtk_grid_distribute_non_homogeneous (GtkGridLines *lines,
				     gint nonempty,
				     gint expand,
				     gint size,
				     gint min,
				     gint max)
{
  GtkRequestedSize *sizes;
  GtkGridLine *line;
  gint extra;
  gint rest;
  int i, j;

  if (nonempty == 0)
    return;

  sizes = g_newa (GtkRequestedSize, nonempty);

  j = 0;
  for (i = min - lines->min; i < max - lines->min; i++)
    {
      line = &lines->lines[i];
      if (line->empty)
	continue;

      size -= line->minimum;

      sizes[j].minimum_size = line->minimum;
      sizes[j].natural_size = line->natural;
      sizes[j].data = line;
      j++;
    }

  size = gtk_distribute_natural_allocation (MAX (0, size), nonempty, sizes);

  if (expand > 0)
    {
      extra = size / expand;
      rest = size % expand;
    }
  else
    {
      extra = 0;
      rest = 0;
    }

  j = 0;
  for (i = min - lines->min; i < max - lines->min; i++)
    {
      line = &lines->lines[i];
      if (line->empty)
	continue;

      g_assert (line == sizes[j].data);

      line->allocation = sizes[j].minimum_size;
      if (line->expand)
	{
	  line->allocation += extra;
	  if (rest > 0)
	    {
	      line->allocation += 1;
	      rest -= 1;
	    }
	}

      j++;
    }
}

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/* Requires that the minimum and natural fields of lines
 * have been set, computes the allocation field of lines
 * by distributing total_size among lines.
 */
static void
gtk_grid_request_allocate (GtkGridRequest *request,
                           GtkOrientation  orientation,
                           gint            total_size)
{
  GtkGridPrivate *priv = request->grid->priv;
  GtkGridLineData *linedata;
  GtkGridLines *lines;
  GtkGridLine *line;
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  gint nonempty1, nonempty2;
  gint expand1, expand2;
  gint i;
  GtkBaselinePosition baseline_pos;
  gint baseline;
  gint extra, extra2;
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  gint rest;
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  gint size1, size2;
  gint split, split_pos;
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  linedata = &priv->linedata[orientation];
  lines = &request->lines[orientation];

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  baseline = gtk_widget_get_allocated_baseline (GTK_WIDGET (request->grid));

  if (orientation == GTK_ORIENTATION_VERTICAL && baseline != -1 &&
      priv->baseline_row >= lines->min && priv->baseline_row < lines->max &&
      lines->lines[priv->baseline_row - lines->min].minimum_above != -1)
    {
      split = priv->baseline_row;
      split_pos = baseline - lines->lines[priv->baseline_row - lines->min].minimum_above;
      gtk_grid_request_compute_expand (request, orientation, lines->min, split, &nonempty1, &expand1);
      gtk_grid_request_compute_expand (request, orientation, split, lines->max, &nonempty2, &expand2);

      if (nonempty2 > 0)
	{
	  size1 = split_pos - (nonempty1) * linedata->spacing;
	  size2 = (total_size - split_pos) - (nonempty2 - 1) * linedata->spacing;
	}
      else
	{
	  size1 = total_size - (nonempty1 - 1) * linedata->spacing;
	  size2 = 0;
	}
    }
  else
    {
      gtk_grid_request_compute_expand (request, orientation, lines->min, lines->max, &nonempty1, &expand1);
      nonempty2 = expand2 = 0;
      split = lines->max;

      size1 = total_size - (nonempty1 - 1) * linedata->spacing;
      size2 = 0;
    }

  if (nonempty1 == 0 && nonempty2 == 0)
    return;
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  if (linedata->homogeneous)
    {
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      if (nonempty1 > 0)
	{
	  extra = size1 / nonempty1;
	  rest = size1 % nonempty1;
	}
      else
	{
	  extra = 0;
	  rest = 0;
	}
      if (nonempty2 > 0)
	{
	  extra2 = size2 / nonempty2;
	  if (extra2 < extra || nonempty1 == 0)
	    {
	      extra = extra2;
	      rest = size2 % nonempty2;
	    }
	}
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      for (i = 0; i < lines->max - lines->min; i++)
        {
          line = &lines->lines[i];
          if (line->empty)
            continue;

          line->allocation = extra;
          if (rest > 0)
            {
              line->allocation += 1;
              rest -= 1;
            }
        }
    }
  else
    {
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      gtk_grid_distribute_non_homogeneous (lines,
					   nonempty1,
					   expand1,
					   size1,
					   lines->min,
					   split);
      gtk_grid_distribute_non_homogeneous (lines,
					   nonempty2,
					   expand2,
					   size2,
					   split,
					   lines->max);
    }
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  for (i = 0; i < lines->max - lines->min; i++)
    {
      line = &lines->lines[i];
      if (line->empty)
	continue;

      if (line->minimum_above != -1)
	{
	  /* Note: This is overridden in gtk_grid_request_position for the allocated baseline */
	  baseline_pos = gtk_grid_get_row_baseline_position (request->grid, i + lines->min);

	  switch (baseline_pos)
	    {
	    case GTK_BASELINE_POSITION_TOP:
	      line->allocated_baseline =
		line->minimum_above;
	      break;
	    case GTK_BASELINE_POSITION_CENTER:
	      line->allocated_baseline =
		line->minimum_above +
		(line->allocation - (line->minimum_above + line->minimum_below)) / 2;
	      break;
	    case GTK_BASELINE_POSITION_BOTTOM:
	      line->allocated_baseline =
		line->allocation - line->minimum_below;
	      break;
	    }
	}
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      else
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	line->allocated_baseline = -1;
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    }
}

/* Computes the position fields from allocation and spacing.
 */
static void
gtk_grid_request_position (GtkGridRequest *request,
                           GtkOrientation  orientation)
{
  GtkGridPrivate *priv = request->grid->priv;
  GtkGridLineData *linedata;
  GtkGridLines *lines;
  GtkGridLine *line;
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  gint position, old_position;
  int allocated_baseline;
  gint i, j;
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  linedata = &priv->linedata[orientation];
  lines = &request->lines[orientation];

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  allocated_baseline = gtk_widget_get_allocated_baseline (GTK_WIDGET(request->grid));

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  position = 0;
  for (i = 0; i < lines->max - lines->min; i++)
    {
      line = &lines->lines[i];
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      if (orientation == GTK_ORIENTATION_VERTICAL &&
	  i + lines->min == priv->baseline_row &&
	  allocated_baseline != -1 &&
	  lines->lines[i].minimum_above != -1)
	{
	  old_position = position;
	  position = allocated_baseline - line->minimum_above;

	  /* Back-patch previous rows */
	  for (j = 0; j < i; j++)
	    {
	      if (!lines->lines[j].empty)
		lines->lines[j].position += position - old_position;
	    }
	}

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      if (!line->empty)
        {
          line->position = position;
          position += line->allocation + linedata->spacing;
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	  if (orientation == GTK_ORIENTATION_VERTICAL &&
	      i + lines->min == priv->baseline_row &&
	      allocated_baseline != -1 &&
	      lines->lines[i].minimum_above != -1)
	    line->allocated_baseline = allocated_baseline - line->position;
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        }
    }
}

static void
gtk_grid_get_size (GtkGrid        *grid,
                   GtkOrientation  orientation,
                   gint           *minimum,
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                   gint           *natural,
		   gint           *minimum_baseline,
		   gint           *natural_baseline)
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{
  GtkGridRequest request;
  GtkGridLines *lines;

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  *minimum = 0;
  *natural = 0;
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  if (minimum_baseline)
    *minimum_baseline = -1;

  if (natural_baseline)
    *natural_baseline = -1;

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  if (grid->priv->children == NULL)
    return;

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  request.grid = grid;
  gtk_grid_request_count_lines (&request);
  lines = &request.lines[orientation];
  lines->lines = g_newa (GtkGridLine, lines->max - lines->min);
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  memset (lines->lines, 0, (lines->max - lines->min) * sizeof (GtkGridLine));
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  gtk_grid_request_run (&request, orientation, FALSE);
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  gtk_grid_request_sum (&request, orientation, minimum, natural,
			minimum_baseline, natural_baseline);
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}

static void
gtk_grid_get_size_for_size (GtkGrid        *grid,
                            GtkOrientation  orientation,
                            gint            size,
                            gint           *minimum,
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                            gint           *natural,
			    gint           *minimum_baseline,
                            gint           *natural_baseline)
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{
  GtkGridRequest request;
  GtkGridLines *lines;
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  gint min_size, nat_size;
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  *minimum = 0;
  *natural = 0;
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  if (minimum_baseline)
    *minimum_baseline = -1;

  if (natural_baseline)
    *natural_baseline = -1;

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  if (grid->priv->children == NULL)
    return;

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  request.grid = grid;
  gtk_grid_request_count_lines (&request);
  lines = &request.lines[0];
  lines->lines = g_newa (GtkGridLine, lines->max - lines->min);
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  memset (lines->lines, 0, (lines->max - lines->min) * sizeof (GtkGridLine));
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  lines = &request.lines[1];
  lines->lines = g_newa (GtkGridLine, lines->max - lines->min);
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  memset (lines->lines, 0, (lines->max - lines->min) * sizeof (GtkGridLine));
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  gtk_grid_request_run (&request, 1 - orientation, FALSE);
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  gtk_grid_request_sum (&request, 1 - orientation, &min_size, &nat_size, NULL, NULL);
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  gtk_grid_request_allocate (&request, 1 - orientation, MAX (size, min_size));

  gtk_grid_request_run (&request, orientation, TRUE);
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  gtk_grid_request_sum (&request, orientation, minimum, natural, minimum_baseline, natural_baseline);
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}

static void
gtk_grid_get_preferred_width (GtkWidget *widget,
                              gint      *minimum,
                              gint      *natural)
{
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  gtk_css_gadget_get_preferred_size (GTK_GRID (widget)->priv->gadget,
                                     GTK_ORIENTATION_HORIZONTAL,
                                     -1,
                                     minimum, natural,
                                     NULL, NULL);
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}

static void
gtk_grid_get_preferred_height (GtkWidget *widget,
                               gint      *minimum,
                               gint      *natural)
{
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  gtk_css_gadget_get_preferred_size (GTK_GRID (widget)->priv->gadget,
                                     GTK_ORIENTATION_VERTICAL,
                                     -1,
                                     minimum, natural,
                                     NULL, NULL);
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}

static void
gtk_grid_get_preferred_width_for_height (GtkWidget *widget,
                                         gint       height,
                                         gint      *minimum,
                                         gint      *natural)
{
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  gtk_css_gadget_get_preferred_size (GTK_GRID (widget)->priv->gadget,
                                     GTK_ORIENTATION_HORIZONTAL,
                                     height,
                                     minimum, natural,
                                     NULL, NULL);
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}

static void
gtk_grid_get_preferred_height_for_width (GtkWidget *widget,
                                         gint       width,
                                         gint      *minimum,
                                         gint      *natural)
{
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  gtk_css_gadget_get_preferred_size (GTK_GRID (widget)->priv->gadget,
                                     GTK_ORIENTATION_VERTICAL,
                                     width,
                                     minimum, natural,
                                     NULL, NULL);
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}

static void
gtk_grid_get_preferred_height_and_baseline_for_width (GtkWidget *widget,
						      gint       width,
						      gint      *minimum,
						      gint      *natural,
						      gint      *minimum_baseline,
						      gint      *natural_baseline)
{
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  gtk_css_gadget_get_preferred_size (GTK_GRID (widget)->priv->gadget,
                                     GTK_ORIENTATION_VERTICAL,
                                     width,
                                     minimum, natural,
                                     minimum_baseline, natural_baseline);
}

static void
gtk_grid_measure (GtkCssGadget   *gadget,
                  GtkOrientation  orientation,
                  int             for_size,
                  int            *minimum,
                  int            *natural,
                  int            *minimum_baseline,
                  int            *natural_baseline,
                  gpointer        data)
{
  GtkWidget *widget = gtk_css_gadget_get_owner (gadget);
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  GtkGrid *grid = GTK_GRID (widget);

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  if ((orientation == GTK_ORIENTATION_HORIZONTAL &&
       gtk_widget_get_request_mode (widget) == GTK_SIZE_REQUEST_WIDTH_FOR_HEIGHT) ||
      (orientation == GTK_ORIENTATION_VERTICAL &&
       gtk_widget_get_request_mode (widget) == GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH))
    gtk_grid_get_size_for_size (grid, orientation, for_size, minimum, natural, minimum_baseline, natural_baseline);
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  else
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    gtk_grid_get_size (grid, orientation, minimum, natural, minimum_baseline, natural_baseline);
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}

static void
allocate_child (GtkGridRequest *request,
                GtkOrientation  orientation,
                GtkGridChild   *child,
                gint           *position,
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                gint           *size,
		gint           *baseline)
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{
  GtkGridPrivate *priv = request->grid->priv;
  GtkGridLineData *linedata;
  GtkGridLines *lines;
  GtkGridLine *line;
  GtkGridChildAttach *attach;
  gint i;

  linedata = &priv->linedata[orientation];
  lines = &request->lines[orientation];
  attach = &child->attach[orientation];

  *position = lines->lines[attach->pos - lines->min].position;
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  if (attach->span == 1)
    *baseline = lines->lines[attach->pos - lines->min].allocated_baseline;
  else
    *baseline = -1;
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  *size = (attach->span - 1) * linedata->spacing;
  for (i = 0; i < attach->span; i++)
    {
      line = &lines->lines[attach->pos - lines->min + i];
      *size += line->allocation;
    }
}

static void
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gtk_grid_request_allocate_children (GtkGridRequest      *request,
                                    const GtkAllocation *allocation)
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{
  GtkGridPrivate *priv = request->grid->priv;
  GList *list;
  GtkGridChild *child;
  GtkAllocation child_allocation;
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  gint x, y, width, height, baseline, ignore;
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  for (list = priv->children; list; list = list->next)
    {
      child = list->data;

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      if (!_gtk_widget_get_visible (child->widget))
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        continue;

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      allocate_child (request, GTK_ORIENTATION_HORIZONTAL, child, &x, &width, &ignore);
      allocate_child (request, GTK_ORIENTATION_VERTICAL, child, &y, &height, &baseline);
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      child_allocation.x = allocation->x + x;
      child_allocation.y = allocation->y + y;
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      child_allocation.width = MAX (1, width);
      child_allocation.height = MAX (1, height);

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      if (gtk_widget_get_direction (GTK_WIDGET (request->grid)) == GTK_TEXT_DIR_RTL)
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        child_allocation.x = allocation->x + allocation->width
                             - (child_allocation.x - allocation->x) - child_allocation.width;
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      gtk_widget_size_allocate_with_baseline (child->widget, &child_allocation, baseline);
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    }
}

#define GET_SIZE(allocation, orientation) (orientation == GTK_ORIENTATION_HORIZONTAL ? allocation->width : allocation->height)

static void
gtk_grid_size_allocate (GtkWidget     *widget,
                        GtkAllocation *allocation)
{
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  GtkAllocation clip;

  gtk_widget_set_allocation (widget, allocation);

  gtk_css_gadget_allocate (GTK_GRID (widget)->priv->gadget,
                           allocation,
                           gtk_widget_get_allocated_baseline (widget),
                           &clip);

  gtk_widget_set_clip (widget, &clip);
}

static void
gtk_grid_allocate (GtkCssGadget        *gadget,
                   const GtkAllocation *allocation,
                   int                  baseline,
                   GtkAllocation       *out_clip,
                   gpointer             data)
{
  GtkWidget *widget = gtk_css_gadget_get_owner (gadget);
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  GtkGrid *grid = GTK_GRID (widget);
  GtkGridPrivate *priv = grid->priv;
  GtkGridRequest request;
  GtkGridLines *lines;
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  GtkOrientation orientation;
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  if (priv->children == NULL)
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    return;
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  request.grid = grid;
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  gtk_grid_request_count_lines (&request);
  lines = &request.lines[0];
  lines->lines = g_newa (GtkGridLine, lines->max - lines->min);
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  memset (lines->lines, 0, (lines->max - lines->min) * sizeof (GtkGridLine));
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  lines = &request.lines[1];
  lines->lines = g_newa (GtkGridLine, lines->max - lines->min);
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  memset (lines->lines, 0, (lines->max - lines->min) * sizeof (GtkGridLine));
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  if (gtk_widget_get_request_mode (widget) == GTK_SIZE_REQUEST_WIDTH_FOR_HEIGHT)
    orientation = GTK_ORIENTATION_HORIZONTAL;
  else
    orientation = GTK_ORIENTATION_VERTICAL;

  gtk_grid_request_run (&request, 1 - orientation, FALSE);
  gtk_grid_request_allocate (&request, 1 - orientation, GET_SIZE (allocation, 1 - orientation));
  gtk_grid_request_run (&request, orientation, TRUE);
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  gtk_grid_request_allocate (&request, orientation, GET_SIZE (allocation, orientation));
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  gtk_grid_request_position (&request, 0);
  gtk_grid_request_position (&request, 1);

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  gtk_grid_request_allocate_children (&request, allocation);
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  gtk_container_get_children_clip (GTK_CONTAINER (grid), out_clip);
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}

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static gboolean
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gtk_grid_render (GtkCssGadget *gadget,
                 cairo_t      *cr,
                 int           x,
                 int           y,
                 int           width,
                 int           height,
                 gpointer      data)
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{
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  GTK_WIDGET_CLASS (gtk_grid_parent_class)->draw (gtk_css_gadget_get_owner (gadget), cr);
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  return FALSE;
}
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static gboolean
gtk_grid_draw (GtkWidget *widget,
               cairo_t   *cr)
{
  gtk_css_gadget_draw (GTK_GRID (widget)->priv->gadget, cr);
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  return FALSE;
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}

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static void
gtk_grid_class_init (GtkGridClass *class)
{
  GObjectClass *object_class = G_OBJECT_CLASS (class);
  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
  GtkContainerClass *container_class = GTK_CONTAINER_CLASS (class);

  object_class->get_property = gtk_grid_get_property;
  object_class->set_property = gtk_grid_set_property;
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  object_class->finalize = gtk_grid_finalize;
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  widget_class->size_allocate = gtk_grid_size_allocate;
  widget_class->get_preferred_width = gtk_grid_get_preferred_width;
  widget_class->get_preferred_height = gtk_grid_get_preferred_height;
  widget_class->get_preferred_width_for_height = gtk_grid_get_preferred_width_for_height;
  widget_class->get_preferred_height_for_width = gtk_grid_get_preferred_height_for_width;
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  widget_class->get_preferred_height_and_baseline_for_width = gtk_grid_get_preferred_height_and_baseline_for_width;
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  widget_class->draw = gtk_grid_draw;
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  container_class->add = gtk_grid_add;
  container_class->remove = gtk_grid_remove;
  container_class->forall = gtk_grid_forall;
  container_class->child_type = gtk_grid_child_type;
  container_class->set_child_property = gtk_grid_set_child_property;
  container_class->get_child_property = gtk_grid_get_child_property;
  gtk_container_class_handle_border_width (container_class);

  g_object_class_override_property (object_class, PROP_ORIENTATION, "orientation");

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  obj_properties[PROP_ROW_SPACING] =
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    g_param_spec_int ("row-spacing",
                      P_("Row spacing"),
                      P_("The amount of space between two consecutive rows"),
                      0, G_MAXINT16, 0,
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                      GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);