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gimp/libgimpwidgets/gimpunitstore.c

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/* LIBGIMP - The GIMP Library
* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
*
* gimpunitstore.c
* Copyright (C) 2004 Sven Neumann <sven@gimp.org>
*
* 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 3 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gtk/gtk.h>
#include "libgimpbase/gimpbase.h"
#include "gimpwidgetstypes.h"
#include "gimpunitstore.h"
/**
* SECTION: gimpunitstore
* @title: GimpUnitStore
* @short_description: A model for units
*
* A model for #GimpUnit views
**/
enum
{
PROP_0,
PROP_NUM_VALUES,
PROP_HAS_PIXELS,
PROP_HAS_PERCENT,
PROP_SHORT_FORMAT,
PROP_LONG_FORMAT
};
typedef struct
{
gint num_values;
gboolean has_pixels;
gboolean has_percent;
gchar *short_format;
gchar *long_format;
gdouble *values;
gdouble *resolutions;
GimpUnit synced_unit;
} GimpUnitStorePrivate;
#define GET_PRIVATE(obj) ((GimpUnitStorePrivate *) gimp_unit_store_get_instance_private ((GimpUnitStore *) (obj)))
static void gimp_unit_store_tree_model_init (GtkTreeModelIface *iface);
static void gimp_unit_store_finalize (GObject *object);
static void gimp_unit_store_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void gimp_unit_store_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static GtkTreeModelFlags gimp_unit_store_get_flags (GtkTreeModel *tree_model);
static gint gimp_unit_store_get_n_columns (GtkTreeModel *tree_model);
static GType gimp_unit_store_get_column_type (GtkTreeModel *tree_model,
gint index);
static gboolean gimp_unit_store_get_iter (GtkTreeModel *tree_model,
GtkTreeIter *iter,
GtkTreePath *path);
static GtkTreePath *gimp_unit_store_get_path (GtkTreeModel *tree_model,
GtkTreeIter *iter);
static void gimp_unit_store_tree_model_get_value (GtkTreeModel *tree_model,
GtkTreeIter *iter,
gint column,
GValue *value);
static gboolean gimp_unit_store_iter_next (GtkTreeModel *tree_model,
GtkTreeIter *iter);
static gboolean gimp_unit_store_iter_children (GtkTreeModel *tree_model,
GtkTreeIter *iter,
GtkTreeIter *parent);
static gboolean gimp_unit_store_iter_has_child (GtkTreeModel *tree_model,
GtkTreeIter *iter);
static gint gimp_unit_store_iter_n_children (GtkTreeModel *tree_model,
GtkTreeIter *iter);
static gboolean gimp_unit_store_iter_nth_child (GtkTreeModel *tree_model,
GtkTreeIter *iter,
GtkTreeIter *parent,
gint n);
static gboolean gimp_unit_store_iter_parent (GtkTreeModel *tree_model,
GtkTreeIter *iter,
GtkTreeIter *child);
G_DEFINE_TYPE_WITH_CODE (GimpUnitStore, gimp_unit_store, G_TYPE_OBJECT,
G_ADD_PRIVATE (GimpUnitStore)
G_IMPLEMENT_INTERFACE (GTK_TYPE_TREE_MODEL,
gimp_unit_store_tree_model_init))
#define parent_class gimp_unit_store_parent_class
static GType column_types[GIMP_UNIT_STORE_UNIT_COLUMNS] =
{
G_TYPE_INVALID,
G_TYPE_DOUBLE,
G_TYPE_INT,
G_TYPE_STRING,
G_TYPE_STRING,
G_TYPE_STRING,
G_TYPE_STRING,
G_TYPE_STRING,
G_TYPE_STRING,
G_TYPE_STRING
};
static void
gimp_unit_store_class_init (GimpUnitStoreClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
column_types[GIMP_UNIT_STORE_UNIT] = GIMP_TYPE_UNIT;
object_class->finalize = gimp_unit_store_finalize;
object_class->set_property = gimp_unit_store_set_property;
object_class->get_property = gimp_unit_store_get_property;
g_object_class_install_property (object_class, PROP_NUM_VALUES,
g_param_spec_int ("num-values",
"Num Values",
"The number of values this store provides",
0, G_MAXINT, 0,
GIMP_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY));
g_object_class_install_property (object_class, PROP_HAS_PIXELS,
g_param_spec_boolean ("has-pixels",
"Has Pixels",
"Whether the store has GIMP_UNIT_PIXELS",
TRUE,
GIMP_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_HAS_PERCENT,
g_param_spec_boolean ("has-percent",
"Has Percent",
"Whether the store has GIMP_UNIT_PERCENT",
FALSE,
GIMP_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_SHORT_FORMAT,
g_param_spec_string ("short-format",
"Short Format",
"Format string for a short label",
"%a",
GIMP_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_LONG_FORMAT,
g_param_spec_string ("long-format",
"Long Format",
"Format string for a long label",
"%p",
GIMP_PARAM_READWRITE));
}
static void
gimp_unit_store_init (GimpUnitStore *store)
{
GimpUnitStorePrivate *private = GET_PRIVATE (store);
private->has_pixels = TRUE;
private->has_percent = FALSE;
private->short_format = g_strdup ("%a");
private->long_format = g_strdup ("%p");
private->synced_unit = gimp_unit_get_number_of_units () - 1;
}
static void
gimp_unit_store_tree_model_init (GtkTreeModelIface *iface)
{
iface->get_flags = gimp_unit_store_get_flags;
iface->get_n_columns = gimp_unit_store_get_n_columns;
iface->get_column_type = gimp_unit_store_get_column_type;
iface->get_iter = gimp_unit_store_get_iter;
iface->get_path = gimp_unit_store_get_path;
iface->get_value = gimp_unit_store_tree_model_get_value;
iface->iter_next = gimp_unit_store_iter_next;
iface->iter_children = gimp_unit_store_iter_children;
iface->iter_has_child = gimp_unit_store_iter_has_child;
iface->iter_n_children = gimp_unit_store_iter_n_children;
iface->iter_nth_child = gimp_unit_store_iter_nth_child;
iface->iter_parent = gimp_unit_store_iter_parent;
}
static void
gimp_unit_store_finalize (GObject *object)
{
GimpUnitStorePrivate *private = GET_PRIVATE (object);
g_clear_pointer (&private->short_format, g_free);
g_clear_pointer (&private->long_format, g_free);
g_clear_pointer (&private->values, g_free);
g_clear_pointer (&private->resolutions, g_free);
private->num_values = 0;
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gimp_unit_store_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
GimpUnitStorePrivate *private = GET_PRIVATE (object);
switch (property_id)
{
case PROP_NUM_VALUES:
g_return_if_fail (private->num_values == 0);
private->num_values = g_value_get_int (value);
if (private->num_values)
{
private->values = g_new0 (gdouble, private->num_values);
private->resolutions = g_new0 (gdouble, private->num_values);
}
break;
case PROP_HAS_PIXELS:
gimp_unit_store_set_has_pixels (GIMP_UNIT_STORE (object),
g_value_get_boolean (value));
break;
case PROP_HAS_PERCENT:
gimp_unit_store_set_has_percent (GIMP_UNIT_STORE (object),
g_value_get_boolean (value));
break;
case PROP_SHORT_FORMAT:
g_free (private->short_format);
private->short_format = g_value_dup_string (value);
if (! private->short_format)
private->short_format = g_strdup ("%a");
break;
case PROP_LONG_FORMAT:
g_free (private->long_format);
private->long_format = g_value_dup_string (value);
if (! private->long_format)
private->long_format = g_strdup ("%a");
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_unit_store_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
GimpUnitStorePrivate *private = GET_PRIVATE (object);
switch (property_id)
{
case PROP_NUM_VALUES:
g_value_set_int (value, private->num_values);
break;
case PROP_HAS_PIXELS:
g_value_set_boolean (value, private->has_pixels);
break;
case PROP_HAS_PERCENT:
g_value_set_boolean (value, private->has_percent);
break;
case PROP_SHORT_FORMAT:
g_value_set_string (value, private->short_format);
break;
case PROP_LONG_FORMAT:
g_value_set_string (value, private->long_format);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static GtkTreeModelFlags
gimp_unit_store_get_flags (GtkTreeModel *tree_model)
{
return GTK_TREE_MODEL_ITERS_PERSIST | GTK_TREE_MODEL_LIST_ONLY;
}
static gint
gimp_unit_store_get_n_columns (GtkTreeModel *tree_model)
{
GimpUnitStorePrivate *private = GET_PRIVATE (tree_model);
return GIMP_UNIT_STORE_UNIT_COLUMNS + private->num_values;
}
static GType
gimp_unit_store_get_column_type (GtkTreeModel *tree_model,
gint index)
{
g_return_val_if_fail (index >= 0, G_TYPE_INVALID);
if (index < GIMP_UNIT_STORE_UNIT_COLUMNS)
return column_types[index];
return G_TYPE_DOUBLE;
}
static gboolean
gimp_unit_store_get_iter (GtkTreeModel *tree_model,
GtkTreeIter *iter,
GtkTreePath *path)
{
GimpUnitStorePrivate *private = GET_PRIVATE (tree_model);
gint index;
GimpUnit unit;
g_return_val_if_fail (gtk_tree_path_get_depth (path) > 0, FALSE);
index = gtk_tree_path_get_indices (path)[0];
unit = index;
if (! private->has_pixels)
unit++;
if (private->has_percent)
{
unit--;
if (private->has_pixels)
{
if (index == 0)
unit = GIMP_UNIT_PIXEL;
else if (index == 1)
unit = GIMP_UNIT_PERCENT;
}
else
{
if (index == 0)
unit = GIMP_UNIT_PERCENT;
}
}
if ((unit >= 0 && unit < gimp_unit_get_number_of_units ()) ||
((unit == GIMP_UNIT_PERCENT && private->has_percent)))
{
iter->user_data = GINT_TO_POINTER (unit);
return TRUE;
}
return FALSE;
}
static GtkTreePath *
gimp_unit_store_get_path (GtkTreeModel *tree_model,
GtkTreeIter *iter)
{
GimpUnitStorePrivate *private = GET_PRIVATE (tree_model);
GtkTreePath *path = gtk_tree_path_new ();
GimpUnit unit = GPOINTER_TO_INT (iter->user_data);
gint index;
index = unit;
if (! private->has_pixels)
index--;
if (private->has_percent)
{
index++;
if (private->has_pixels)
{
if (unit == GIMP_UNIT_PIXEL)
index = 0;
else if (unit == GIMP_UNIT_PERCENT)
index = 1;
}
else
{
if (unit == GIMP_UNIT_PERCENT)
index = 0;
}
}
gtk_tree_path_append_index (path, index);
return path;
}
static void
gimp_unit_store_tree_model_get_value (GtkTreeModel *tree_model,
GtkTreeIter *iter,
gint column,
GValue *value)
{
GimpUnitStorePrivate *private = GET_PRIVATE (tree_model);
GimpUnit unit;
g_return_if_fail (column >= 0 &&
column < GIMP_UNIT_STORE_UNIT_COLUMNS + private->num_values);
g_value_init (value,
column < GIMP_UNIT_STORE_UNIT_COLUMNS ?
column_types[column] :
G_TYPE_DOUBLE);
unit = GPOINTER_TO_INT (iter->user_data);
if ((unit >= 0 && unit < gimp_unit_get_number_of_units ()) ||
((unit == GIMP_UNIT_PERCENT && private->has_percent)))
{
switch (column)
{
case GIMP_UNIT_STORE_UNIT:
g_value_set_int (value, unit);
break;
case GIMP_UNIT_STORE_UNIT_FACTOR:
g_value_set_double (value, gimp_unit_get_factor (unit));
break;
case GIMP_UNIT_STORE_UNIT_DIGITS:
g_value_set_int (value, gimp_unit_get_digits (unit));
break;
case GIMP_UNIT_STORE_UNIT_IDENTIFIER:
g_value_set_static_string (value, gimp_unit_get_identifier (unit));
break;
case GIMP_UNIT_STORE_UNIT_SYMBOL:
g_value_set_static_string (value, gimp_unit_get_symbol (unit));
break;
case GIMP_UNIT_STORE_UNIT_ABBREVIATION:
g_value_set_static_string (value, gimp_unit_get_abbreviation (unit));
break;
case GIMP_UNIT_STORE_UNIT_SINGULAR:
g_value_set_static_string (value, gimp_unit_get_singular (unit));
break;
case GIMP_UNIT_STORE_UNIT_PLURAL:
g_value_set_static_string (value, gimp_unit_get_plural (unit));
break;
case GIMP_UNIT_STORE_UNIT_SHORT_FORMAT:
g_value_take_string (value,
gimp_unit_format_string (private->short_format,
unit));
break;
case GIMP_UNIT_STORE_UNIT_LONG_FORMAT:
g_value_take_string (value,
gimp_unit_format_string (private->long_format,
unit));
break;
default:
column -= GIMP_UNIT_STORE_UNIT_COLUMNS;
if (unit == GIMP_UNIT_PIXEL)
{
g_value_set_double (value, private->values[column]);
}
else if (private->resolutions[column])
{
g_value_set_double (value,
private->values[column] *
gimp_unit_get_factor (unit) /
private->resolutions[column]);
}
break;
}
}
}
static gboolean
gimp_unit_store_iter_next (GtkTreeModel *tree_model,
GtkTreeIter *iter)
{
GimpUnitStorePrivate *private = GET_PRIVATE (tree_model);
GimpUnit unit = GPOINTER_TO_INT (iter->user_data);
if (unit == GIMP_UNIT_PIXEL && private->has_percent)
{
unit = GIMP_UNIT_PERCENT;
}
else if (unit == GIMP_UNIT_PERCENT)
{
unit = GIMP_UNIT_INCH;
}
else if (unit >= 0 && unit < gimp_unit_get_number_of_units () - 1)
{
unit++;
}
else
{
return FALSE;
}
iter->user_data = GINT_TO_POINTER (unit);
return TRUE;
}
static gboolean
gimp_unit_store_iter_children (GtkTreeModel *tree_model,
GtkTreeIter *iter,
GtkTreeIter *parent)
{
GimpUnitStorePrivate *private = GET_PRIVATE (tree_model);
GimpUnit unit;
/* this is a list, nodes have no children */
if (parent)
return FALSE;
if (private->has_pixels)
{
unit = GIMP_UNIT_PIXEL;
}
else if (private->has_percent)
{
unit = GIMP_UNIT_PERCENT;
}
else
{
unit = GIMP_UNIT_INCH;
}
iter->user_data = GINT_TO_POINTER (unit);
return TRUE;
}
static gboolean
gimp_unit_store_iter_has_child (GtkTreeModel *tree_model,
GtkTreeIter *iter)
{
return FALSE;
}
static gint
gimp_unit_store_iter_n_children (GtkTreeModel *tree_model,
GtkTreeIter *iter)
{
GimpUnitStorePrivate *private = GET_PRIVATE (tree_model);
gint n_children;
if (iter)
return 0;
n_children = gimp_unit_get_number_of_units ();
if (! private->has_pixels)
n_children--;
if (private->has_percent)
n_children++;
return n_children;
}
static gboolean
gimp_unit_store_iter_nth_child (GtkTreeModel *tree_model,
GtkTreeIter *iter,
GtkTreeIter *parent,
gint n)
{
GimpUnitStorePrivate *private = GET_PRIVATE (tree_model);
gint n_children;
if (parent)
return FALSE;
n_children = gimp_unit_store_iter_n_children (tree_model, NULL);
if (n >= 0 && n < n_children)
{
GimpUnit unit = n;
if (! private->has_pixels)
unit++;
if (private->has_percent)
{
unit--;
if (private->has_pixels)
{
if (n == 0)
unit = GIMP_UNIT_PIXEL;
else if (n == 1)
unit = GIMP_UNIT_PERCENT;
}
else
{
if (n == 0)
unit = GIMP_UNIT_PERCENT;
}
}
iter->user_data = GINT_TO_POINTER (unit);
return TRUE;
}
return FALSE;
}
static gboolean
gimp_unit_store_iter_parent (GtkTreeModel *tree_model,
GtkTreeIter *iter,
GtkTreeIter *child)
{
return FALSE;
}
GimpUnitStore *
gimp_unit_store_new (gint num_values)
{
return g_object_new (GIMP_TYPE_UNIT_STORE,
"num-values", num_values,
NULL);
}
void
gimp_unit_store_set_has_pixels (GimpUnitStore *store,
gboolean has_pixels)
{
GimpUnitStorePrivate *private;
g_return_if_fail (GIMP_IS_UNIT_STORE (store));
private = GET_PRIVATE (store);
has_pixels = has_pixels ? TRUE : FALSE;
if (has_pixels != private->has_pixels)
{
GtkTreeModel *model = GTK_TREE_MODEL (store);
GtkTreePath *deleted_path = NULL;
if (! has_pixels)
{
GtkTreeIter iter;
gtk_tree_model_get_iter_first (model, &iter);
deleted_path = gtk_tree_model_get_path (model, &iter);
}
private->has_pixels = has_pixels;
if (has_pixels)
{
GtkTreePath *path;
GtkTreeIter iter;
gtk_tree_model_get_iter_first (model, &iter);
path = gtk_tree_model_get_path (model, &iter);
gtk_tree_model_row_inserted (model, path, &iter);
gtk_tree_path_free (path);
}
else if (deleted_path)
{
gtk_tree_model_row_deleted (model, deleted_path);
gtk_tree_path_free (deleted_path);
}
g_object_notify (G_OBJECT (store), "has-pixels");
}
}
gboolean
gimp_unit_store_get_has_pixels (GimpUnitStore *store)
{
GimpUnitStorePrivate *private;
g_return_val_if_fail (GIMP_IS_UNIT_STORE (store), FALSE);
private = GET_PRIVATE (store);
return private->has_pixels;
}
void
gimp_unit_store_set_has_percent (GimpUnitStore *store,
gboolean has_percent)
{
GimpUnitStorePrivate *private;
g_return_if_fail (GIMP_IS_UNIT_STORE (store));
private = GET_PRIVATE (store);
has_percent = has_percent ? TRUE : FALSE;
if (has_percent != private->has_percent)
{
GtkTreeModel *model = GTK_TREE_MODEL (store);
GtkTreePath *deleted_path = NULL;
if (! has_percent)
{
GtkTreeIter iter;
gtk_tree_model_get_iter_first (model, &iter);
if (private->has_pixels)
gtk_tree_model_iter_next (model, &iter);
deleted_path = gtk_tree_model_get_path (model, &iter);
}
private->has_percent = has_percent;
if (has_percent)
{
GtkTreePath *path;
GtkTreeIter iter;
gtk_tree_model_get_iter_first (model, &iter);
if (private->has_pixels)
gtk_tree_model_iter_next (model, &iter);
path = gtk_tree_model_get_path (model, &iter);
gtk_tree_model_row_inserted (model, path, &iter);
gtk_tree_path_free (path);
}
else if (deleted_path)
{
gtk_tree_model_row_deleted (model, deleted_path);
gtk_tree_path_free (deleted_path);
}
g_object_notify (G_OBJECT (store), "has-percent");
}
}
gboolean
gimp_unit_store_get_has_percent (GimpUnitStore *store)
{
GimpUnitStorePrivate *private;
g_return_val_if_fail (GIMP_IS_UNIT_STORE (store), FALSE);
private = GET_PRIVATE (store);
return private->has_percent;
}
void
gimp_unit_store_set_pixel_value (GimpUnitStore *store,
gint index,
gdouble value)
{
GimpUnitStorePrivate *private;
g_return_if_fail (GIMP_IS_UNIT_STORE (store));
private = GET_PRIVATE (store);
g_return_if_fail (index > 0 && index < private->num_values);
private->values[index] = value;
}
void
gimp_unit_store_set_pixel_values (GimpUnitStore *store,
gdouble first_value,
...)
{
GimpUnitStorePrivate *private;
va_list args;
gint i;
g_return_if_fail (GIMP_IS_UNIT_STORE (store));
private = GET_PRIVATE (store);
va_start (args, first_value);
for (i = 0; i < private->num_values; )
{
private->values[i] = first_value;
if (++i < private->num_values)
first_value = va_arg (args, gdouble);
}
va_end (args);
}
void
gimp_unit_store_set_resolution (GimpUnitStore *store,
gint index,
gdouble resolution)
{
GimpUnitStorePrivate *private;
g_return_if_fail (GIMP_IS_UNIT_STORE (store));
private = GET_PRIVATE (store);
g_return_if_fail (index > 0 && index < private->num_values);
private->resolutions[index] = resolution;
}
void
gimp_unit_store_set_resolutions (GimpUnitStore *store,
gdouble first_resolution,
...)
{
GimpUnitStorePrivate *private;
va_list args;
gint i;
g_return_if_fail (GIMP_IS_UNIT_STORE (store));
private = GET_PRIVATE (store);
va_start (args, first_resolution);
for (i = 0; i < private->num_values; )
{
private->resolutions[i] = first_resolution;
if (++i < private->num_values)
first_resolution = va_arg (args, gdouble);
}
va_end (args);
}
gdouble
gimp_unit_store_get_value (GimpUnitStore *store,
GimpUnit unit,
gint index)
{
GimpUnitStorePrivate *private;
GtkTreeIter iter;
GValue value = G_VALUE_INIT;
g_return_val_if_fail (GIMP_IS_UNIT_STORE (store), 0.0);
private = GET_PRIVATE (store);
g_return_val_if_fail (index >= 0 && index < private->num_values, 0.0);
iter.user_data = GINT_TO_POINTER (unit);
gimp_unit_store_tree_model_get_value (GTK_TREE_MODEL (store),
&iter,
GIMP_UNIT_STORE_FIRST_VALUE + index,
&value);
return g_value_get_double (&value);
}
void
gimp_unit_store_get_values (GimpUnitStore *store,
GimpUnit unit,
gdouble *first_value,
...)
{
GimpUnitStorePrivate *private;
va_list args;
gint i;
g_return_if_fail (GIMP_IS_UNIT_STORE (store));
private = GET_PRIVATE (store);
va_start (args, first_value);
for (i = 0; i < private->num_values; )
{
if (first_value)
*first_value = gimp_unit_store_get_value (store, unit, i);
if (++i < private->num_values)
first_value = va_arg (args, gdouble *);
}
va_end (args);
}
void
_gimp_unit_store_sync_units (GimpUnitStore *store)
{
GimpUnitStorePrivate *private;
GtkTreeModel *model;
GtkTreeIter iter;
gboolean iter_valid;
g_return_if_fail (GIMP_IS_UNIT_STORE (store));
private = GET_PRIVATE (store);
model = GTK_TREE_MODEL (store);
for (iter_valid = gtk_tree_model_get_iter_first (model, &iter);
iter_valid;
iter_valid = gtk_tree_model_iter_next (model, &iter))
{
gint unit;
gtk_tree_model_get (model, &iter,
GIMP_UNIT_STORE_UNIT, &unit,
-1);
if (unit != GIMP_UNIT_PERCENT &&
unit > private->synced_unit)
{
GtkTreePath *path;
path = gtk_tree_model_get_path (model, &iter);
gtk_tree_model_row_inserted (model, path, &iter);
gtk_tree_path_free (path);
}
}
private->synced_unit = gimp_unit_get_number_of_units () - 1;
}
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