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mutter/clutter/clutter-list-model.c
Emmanuele Bassi 0ac6d6637e [list-model] Make ClutterListModel subclassable 
ClutterListModel has been added as a terminal class in case we
decided to change API or implementation.

Apparently, it's a lot more resilient than we expected -- or far
too few are using it and reporting bugs. Once common issue, though,
is that it cannot be subclassed, hence it's fairly limited in its
usage.

In the hope that more developers will start using it, here's a
patch that makes ListModel a fully subclassable object.

May whatever god you believe in have mercy on your eventual soul.
2009-02-14 11:31:00 +00:00

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/*
* Clutter.
*
* An OpenGL based 'interactive canvas' library.
*
* Authored By Matthew Allum <mallum@openedhand.com>
* Neil Jagdish Patel <njp@o-hand.com>
* Emmanuele Bassi <ebassi@openedhand.com>
*
* Copyright (C) 2006 OpenedHand
*
* 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
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:clutter-list-model
* @short_description: List model implementation
*
* #ClutterListModel is a #ClutterModel implementation provided by
* Clutter. #ClutterListModel uses a #GSequence for storing the
* values for each row, so it's optimized for insertion and look up
* in sorted lists.
*
* #ClutterListModel is available since Clutter 0.6
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <string.h>
#include <glib-object.h>
#include "clutter-model.h"
#include "clutter-model-private.h"
#include "clutter-list-model.h"
#include "clutter-private.h"
#include "clutter-debug.h"
#define CLUTTER_TYPE_LIST_MODEL_ITER \
(clutter_list_model_iter_get_type())
#define CLUTTER_LIST_MODEL_ITER(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj), \
CLUTTER_TYPE_LIST_MODEL_ITER, \
ClutterListModelIter))
#define CLUTTER_IS_LIST_MODEL_ITER(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj), \
CLUTTER_TYPE_LIST_MODEL_ITER))
#define CLUTTER_LIST_MODEL_ITER_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST ((klass), \
CLUTTER_TYPE_LIST_MODEL_ITER, \
ClutterListModelIterClass))
#define CLUTTER_IS_LIST_MODEL_ITER_CLASS(klass) \
(G_TYPE_CHECK_CLASS_TYPE ((klass), \
CLUTTER_TYPE_LIST_MODEL_ITER))
#define CLUTTER_LIST_MODEL_ITER_GET_CLASS(obj) \
(G_TYPE_INSTANCE_GET_CLASS ((obj), \
CLUTTER_TYPE_LIST_MODEL_ITER, \
ClutterListModelIterClass))
typedef struct _ClutterListModelIter ClutterListModelIter;
typedef struct _ClutterModelIterClass ClutterListModelIterClass;
#define CLUTTER_LIST_MODEL_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), CLUTTER_TYPE_LIST_MODEL, ClutterListModelPrivate))
struct _ClutterListModelPrivate
{
GSequence *sequence;
};
struct _ClutterListModelIter
{
ClutterModelIter parent_instance;
GSequenceIter *seq_iter;
};
/*
* ClutterListModel
*/
G_DEFINE_TYPE (ClutterListModelIter,
clutter_list_model_iter,
CLUTTER_TYPE_MODEL_ITER);
static void
clutter_list_model_iter_get_value (ClutterModelIter *iter,
guint column,
GValue *value)
{
ClutterListModelIter *iter_default;
GValueArray *value_array;
GValue *iter_value;
GValue real_value = { 0, };
gboolean converted = FALSE;
iter_default = CLUTTER_LIST_MODEL_ITER (iter);
g_assert (iter_default->seq_iter != NULL);
value_array = g_sequence_get (iter_default->seq_iter);
iter_value = g_value_array_get_nth (value_array, column);
g_assert (iter_value != NULL);
if (!g_type_is_a (G_VALUE_TYPE (value), G_VALUE_TYPE (iter_value)))
{
if (!g_value_type_compatible (G_VALUE_TYPE (value),
G_VALUE_TYPE (iter_value)) &&
!g_value_type_compatible (G_VALUE_TYPE (iter_value),
G_VALUE_TYPE (value)))
{
g_warning ("%s: Unable to convert from %s to %s",
G_STRLOC,
g_type_name (G_VALUE_TYPE (value)),
g_type_name (G_VALUE_TYPE (iter_value)));
return;
}
if (!g_value_transform (iter_value, &real_value))
{
g_warning ("%s: Unable to make conversion from %s to %s",
G_STRLOC,
g_type_name (G_VALUE_TYPE (value)),
g_type_name (G_VALUE_TYPE (iter_value)));
g_value_unset (&real_value);
}
converted = TRUE;
}
if (converted)
{
g_value_copy (&real_value, value);
g_value_unset (&real_value);
}
else
g_value_copy (iter_value, value);
}
static void
clutter_list_model_iter_set_value (ClutterModelIter *iter,
guint column,
const GValue *value)
{
ClutterListModelIter *iter_default;
GValueArray *value_array;
GValue *iter_value;
GValue real_value = { 0, };
gboolean converted = FALSE;
iter_default = CLUTTER_LIST_MODEL_ITER (iter);
g_assert (iter_default->seq_iter != NULL);
value_array = g_sequence_get (iter_default->seq_iter);
iter_value = g_value_array_get_nth (value_array, column);
g_assert (iter_value != NULL);
if (!g_type_is_a (G_VALUE_TYPE (value), G_VALUE_TYPE (iter_value)))
{
if (!g_value_type_compatible (G_VALUE_TYPE (value),
G_VALUE_TYPE (iter_value)) &&
!g_value_type_compatible (G_VALUE_TYPE (iter_value),
G_VALUE_TYPE (value)))
{
g_warning ("%s: Unable to convert from %s to %s\n",
G_STRLOC,
g_type_name (G_VALUE_TYPE (value)),
g_type_name (G_VALUE_TYPE (iter_value)));
return;
}
if (!g_value_transform (value, &real_value))
{
g_warning ("%s: Unable to make conversion from %s to %s\n",
G_STRLOC,
g_type_name (G_VALUE_TYPE (value)),
g_type_name (G_VALUE_TYPE (iter_value)));
g_value_unset (&real_value);
}
converted = TRUE;
}
if (converted)
{
g_value_copy (&real_value, iter_value);
g_value_unset (&real_value);
}
else
g_value_copy (value, iter_value);
}
static gboolean
clutter_list_model_iter_is_first (ClutterModelIter *iter)
{
ClutterListModelIter *iter_default;
ClutterModel *model;
ClutterModelIter *temp_iter;
GSequence *sequence;
GSequenceIter *begin, *end;
guint row;
iter_default = CLUTTER_LIST_MODEL_ITER (iter);
g_assert (iter_default->seq_iter != NULL);
model = clutter_model_iter_get_model (iter);
row = clutter_model_iter_get_row (iter);
sequence = CLUTTER_LIST_MODEL (model)->priv->sequence;
begin = g_sequence_get_begin_iter (sequence);
end = iter_default->seq_iter;
temp_iter = g_object_new (CLUTTER_TYPE_LIST_MODEL_ITER,
"model", model,
NULL);
while (!g_sequence_iter_is_begin (begin))
{
CLUTTER_LIST_MODEL_ITER (temp_iter)->seq_iter = begin;
g_object_set (G_OBJECT (temp_iter), "row", row, NULL);
if (clutter_model_filter_iter (model, temp_iter))
{
end = begin;
break;
}
begin = g_sequence_iter_next (begin);
row += 1;
}
g_object_unref (temp_iter);
/* This is because the 'begin_iter' is always *before* the last valid
* iter, otherwise we'd have endless loops
*/
end = g_sequence_iter_prev (end);
return iter_default->seq_iter == end;
}
static gboolean
clutter_list_model_iter_is_last (ClutterModelIter *iter)
{
ClutterListModelIter *iter_default;
ClutterModelIter *temp_iter;
ClutterModel *model;
GSequence *sequence;
GSequenceIter *begin, *end;
guint row;
iter_default = CLUTTER_LIST_MODEL_ITER (iter);
g_assert (iter_default->seq_iter != NULL);
if (g_sequence_iter_is_end (iter_default->seq_iter))
return TRUE;
model = clutter_model_iter_get_model (iter);
row = clutter_model_iter_get_row (iter);
sequence = CLUTTER_LIST_MODEL (model)->priv->sequence;
begin = g_sequence_get_end_iter (sequence);
begin = g_sequence_iter_prev (begin);
end = iter_default->seq_iter;
temp_iter = g_object_new (CLUTTER_TYPE_LIST_MODEL_ITER,
"model", model,
NULL);
while (!g_sequence_iter_is_begin (begin))
{
CLUTTER_LIST_MODEL_ITER (temp_iter)->seq_iter = begin;
g_object_set (G_OBJECT (temp_iter), "row", row, NULL);
if (clutter_model_filter_iter (model, temp_iter))
{
end = begin;
break;
}
begin = g_sequence_iter_prev (begin);
row += 1;
}
g_object_unref (temp_iter);
/* This is because the 'end_iter' is always *after* the last valid iter.
* Otherwise we'd have endless loops
*/
end = g_sequence_iter_next (end);
return iter_default->seq_iter == end;
}
static ClutterModelIter *
clutter_list_model_iter_next (ClutterModelIter *iter)
{
ClutterListModelIter *iter_default;
ClutterModelIter *temp_iter;
ClutterModel *model = NULL;
GSequenceIter *filter_next;
guint row;
iter_default = CLUTTER_LIST_MODEL_ITER (iter);
g_assert (iter_default->seq_iter != NULL);
model = clutter_model_iter_get_model (iter);
row = clutter_model_iter_get_row (iter) + 1;
filter_next = g_sequence_iter_next (iter_default->seq_iter);
g_assert (filter_next != NULL);
temp_iter = g_object_new (CLUTTER_TYPE_LIST_MODEL_ITER,
"model", model,
NULL);
while (!g_sequence_iter_is_end (filter_next))
{
CLUTTER_LIST_MODEL_ITER (temp_iter)->seq_iter = filter_next;
g_object_set (G_OBJECT (temp_iter), "row", row, NULL);
if (clutter_model_filter_iter (model, temp_iter))
break;
filter_next = g_sequence_iter_next (filter_next);
row += 1;
}
g_object_unref (temp_iter);
/* We do this because the 'end_iter' is always *after* the last valid iter.
* Otherwise loops will go on forever
*/
if (filter_next == iter_default->seq_iter)
filter_next = g_sequence_iter_next (filter_next);
/* update the iterator and return it */
g_object_set (G_OBJECT (iter_default), "model", model, "row", row, NULL);
iter_default->seq_iter = filter_next;
return CLUTTER_MODEL_ITER (iter_default);
}
static ClutterModelIter *
clutter_list_model_iter_prev (ClutterModelIter *iter)
{
ClutterListModelIter *iter_default;
ClutterModelIter *temp_iter;
ClutterModel *model;
GSequenceIter *filter_prev;
guint row;
iter_default = CLUTTER_LIST_MODEL_ITER (iter);
g_assert (iter_default->seq_iter != NULL);
model = clutter_model_iter_get_model (iter);
row = clutter_model_iter_get_row (iter) - 1;
filter_prev = g_sequence_iter_prev (iter_default->seq_iter);
g_assert (filter_prev != NULL);
temp_iter = g_object_new (CLUTTER_TYPE_LIST_MODEL_ITER,
"model", model,
NULL);
while (!g_sequence_iter_is_begin (filter_prev))
{
CLUTTER_LIST_MODEL_ITER (temp_iter)->seq_iter = filter_prev;
g_object_set (G_OBJECT (temp_iter), "row", row, NULL);
if (clutter_model_filter_iter (model, temp_iter))
break;
filter_prev = g_sequence_iter_prev (filter_prev);
row -= 1;
}
g_object_unref (temp_iter);
/* We do this because the 'end_iter' is always *after* the last valid iter.
* Otherwise loops will go on forever
*/
if (filter_prev == iter_default->seq_iter)
filter_prev = g_sequence_iter_prev (filter_prev);
/* update the iterator and return it */
g_object_set (G_OBJECT (iter_default), "model", model, "row", row, NULL);
iter_default->seq_iter = filter_prev;
return CLUTTER_MODEL_ITER (iter_default);
}
static ClutterModelIter *
clutter_list_model_iter_copy (ClutterModelIter *iter)
{
ClutterListModelIter *iter_default;
ClutterListModelIter *iter_copy;
ClutterModel *model;
guint row;
iter_default = CLUTTER_LIST_MODEL_ITER (iter);
model = clutter_model_iter_get_model (iter);
row = clutter_model_iter_get_row (iter) - 1;
iter_copy = g_object_new (CLUTTER_TYPE_LIST_MODEL_ITER,
"model", model,
"row", row,
NULL);
/* this is safe, because the seq_iter pointer on the passed
* iterator will be always be overwritten in ::next or ::prev
*/
iter_copy->seq_iter = iter_default->seq_iter;
return CLUTTER_MODEL_ITER (iter_copy);
}
static void
clutter_list_model_iter_class_init (ClutterListModelIterClass *klass)
{
ClutterModelIterClass *iter_class = CLUTTER_MODEL_ITER_CLASS (klass);
iter_class->get_value = clutter_list_model_iter_get_value;
iter_class->set_value = clutter_list_model_iter_set_value;
iter_class->is_first = clutter_list_model_iter_is_first;
iter_class->is_last = clutter_list_model_iter_is_last;
iter_class->next = clutter_list_model_iter_next;
iter_class->prev = clutter_list_model_iter_prev;
iter_class->copy = clutter_list_model_iter_copy;
}
static void
clutter_list_model_iter_init (ClutterListModelIter *iter)
{
iter->seq_iter = NULL;
}
/*
* ClutterListModel
*/
G_DEFINE_TYPE (ClutterListModel, clutter_list_model, CLUTTER_TYPE_MODEL);
static ClutterModelIter *
clutter_list_model_get_iter_at_row (ClutterModel *model,
guint row)
{
ClutterListModel *model_default = CLUTTER_LIST_MODEL (model);
GSequence *sequence = model_default->priv->sequence;
ClutterListModelIter *retval;
if (row >= g_sequence_get_length (sequence))
return NULL;
retval = g_object_new (CLUTTER_TYPE_LIST_MODEL_ITER,
"model", model,
"row", row,
NULL);
retval->seq_iter = g_sequence_get_iter_at_pos (sequence, row);
return CLUTTER_MODEL_ITER (retval);
}
static ClutterModelIter *
clutter_list_model_insert_row (ClutterModel *model,
gint index_)
{
ClutterListModel *model_default = CLUTTER_LIST_MODEL (model);
GSequence *sequence = model_default->priv->sequence;
ClutterListModelIter *retval;
guint n_columns, i, pos;
GValueArray *array;
GSequenceIter *seq_iter;
n_columns = clutter_model_get_n_columns (model);
array = g_value_array_new (n_columns);
for (i = 0; i < n_columns; i++)
{
GValue *value = NULL;
g_value_array_append (array, NULL);
value = g_value_array_get_nth (array, i);
g_value_init (value, clutter_model_get_column_type (model, i));
}
if (index_ < 0)
{
seq_iter = g_sequence_append (sequence, array);
pos = g_sequence_get_length (sequence);
}
else if (index_ == 0)
{
seq_iter = g_sequence_prepend (sequence, array);
pos = 0;
}
else
{
seq_iter = g_sequence_get_iter_at_pos (sequence, index_);
seq_iter = g_sequence_insert_before (seq_iter, array);
pos = index_;
}
retval = g_object_new (CLUTTER_TYPE_LIST_MODEL_ITER,
"model", model,
"row", pos,
NULL);
retval->seq_iter = seq_iter;
return CLUTTER_MODEL_ITER (retval);
}
static void
clutter_list_model_remove_row (ClutterModel *model,
guint row)
{
ClutterListModel *model_default = CLUTTER_LIST_MODEL (model);
GSequence *sequence = model_default->priv->sequence;
GSequenceIter *seq_iter;
guint pos = 0;
seq_iter = g_sequence_get_begin_iter (sequence);
while (!g_sequence_iter_is_end (seq_iter))
{
if (clutter_model_filter_row (model, pos))
{
if (pos == row)
{
ClutterModelIter *iter;
iter = g_object_new (CLUTTER_TYPE_LIST_MODEL_ITER,
"model", model,
"row", pos,
NULL);
CLUTTER_LIST_MODEL_ITER (iter)->seq_iter = seq_iter;
/* the actual row is removed from the sequence inside
* the ::row-removed signal class handler, so that every
* handler connected to ::row-removed will still get
* a valid iterator, and every signal connected to
* ::row-removed with the AFTER flag will get an updated
* model
*/
g_signal_emit_by_name (model, "row-removed", iter);
g_object_unref (iter);
break;
}
}
pos += 1;
seq_iter = g_sequence_iter_next (seq_iter);
}
}
static guint
clutter_list_model_get_n_rows (ClutterModel *model)
{
ClutterListModel *model_default = CLUTTER_LIST_MODEL (model);
return g_sequence_get_length (model_default->priv->sequence);
}
typedef struct
{
ClutterModel *model;
guint column;
ClutterModelSortFunc func;
gpointer data;
} SortClosure;
static gint
sort_model_default (gconstpointer a,
gconstpointer b,
gpointer data)
{
GValueArray *row_a = (GValueArray *) a;
GValueArray *row_b = (GValueArray *) b;
SortClosure *clos = data;
return clos->func (clos->model,
g_value_array_get_nth (row_a, clos->column),
g_value_array_get_nth (row_b, clos->column),
clos->data);
}
static void
clutter_list_model_resort (ClutterModel *model,
ClutterModelSortFunc func,
gpointer data)
{
SortClosure sort_closure = { NULL, 0, NULL, NULL };
sort_closure.model = model;
sort_closure.column = clutter_model_get_sorting_column (model);
sort_closure.func = func;
sort_closure.data = data;
g_sequence_sort (CLUTTER_LIST_MODEL (model)->priv->sequence,
sort_model_default,
&sort_closure);
}
static void
clutter_list_model_row_removed (ClutterModel *model,
ClutterModelIter *iter)
{
ClutterListModelIter *iter_default;
GValueArray *array;
iter_default = CLUTTER_LIST_MODEL_ITER (iter);
array = g_sequence_get (iter_default->seq_iter);
g_value_array_free (array);
g_sequence_remove (iter_default->seq_iter);
iter_default->seq_iter = NULL;
}
static void
clutter_list_model_finalize (GObject *gobject)
{
ClutterListModel *model = CLUTTER_LIST_MODEL (gobject);
GSequence *sequence = model->priv->sequence;
GSequenceIter *iter;
iter = g_sequence_get_begin_iter (sequence);
while (!g_sequence_iter_is_end (iter))
{
GValueArray *value_array = g_sequence_get (iter);
g_value_array_free (value_array);
iter = g_sequence_iter_next (iter);
}
g_sequence_free (sequence);
G_OBJECT_CLASS (clutter_list_model_parent_class)->finalize (gobject);
}
static void
clutter_list_model_class_init (ClutterListModelClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
ClutterModelClass *model_class = CLUTTER_MODEL_CLASS (klass);
g_type_class_add_private (klass, sizeof (ClutterListModelPrivate));
gobject_class->finalize = clutter_list_model_finalize;
model_class->get_n_rows = clutter_list_model_get_n_rows;
model_class->get_iter_at_row = clutter_list_model_get_iter_at_row;
model_class->insert_row = clutter_list_model_insert_row;
model_class->remove_row = clutter_list_model_remove_row;
model_class->resort = clutter_list_model_resort;
model_class->row_removed = clutter_list_model_row_removed;
}
static void
clutter_list_model_init (ClutterListModel *model)
{
model->priv = CLUTTER_LIST_MODEL_GET_PRIVATE (model);
model->priv->sequence = g_sequence_new (NULL);
}
/**
* clutter_list_model_new:
* @n_columns: number of columns in the model
* @Varargs: @n_columns number of #GType and string pairs
*
* Creates a new default model with @n_columns columns with the types
* and names passed in.
*
* For example:
*
* <informalexample><programlisting>
* model = clutter_list_model_new (3,
* G_TYPE_INT, "Score",
* G_TYPE_STRING, "Team",
* GDK_TYPE_PIXBUF, "Logo");
* </programlisting></informalexample>
*
* will create a new #ClutterModel with three columns of type int,
* string and #GdkPixbuf respectively.
*
* Note that the name of the column can be set to %NULL, in which case
* the canonical name of the type held by the column will be used as
* the title.
*
* Return value: a new #ClutterListModel
*
* Since: 0.6
*/
ClutterModel *
clutter_list_model_new (guint n_columns,
...)
{
ClutterModel *model;
va_list args;
gint i;
g_return_val_if_fail (n_columns > 0, NULL);
model = g_object_new (CLUTTER_TYPE_LIST_MODEL, NULL);
clutter_model_set_n_columns (model, n_columns, TRUE, TRUE);
va_start (args, n_columns);
for (i = 0; i < n_columns; i++)
{
GType type = va_arg (args, GType);
const gchar *name = va_arg (args, gchar*);
if (!clutter_model_check_type (type))
{
g_warning ("%s: Invalid type %s\n", G_STRLOC, g_type_name (type));
g_object_unref (model);
return NULL;
}
clutter_model_set_column_type (model, i, type);
clutter_model_set_column_name (model, i, name);
}
va_end (args);
return model;
}
/**
* clutter_list_model_newv:
* @n_columns: number of columns in the model
* @types: an array of #GType types for the columns, from first to last
* @names: an array of names for the columns, from first to last
*
* Non-vararg version of clutter_list_model_new(). This function is
* useful for language bindings.
*
* Return value: a new default #ClutterModel
*
* Since: 0.6
*/
ClutterModel *
clutter_list_model_newv (guint n_columns,
GType *types,
const gchar * const names[])
{
ClutterModel *model;
gint i;
g_return_val_if_fail (n_columns > 0, NULL);
model = g_object_new (CLUTTER_TYPE_LIST_MODEL, NULL);
clutter_model_set_n_columns (model, n_columns, TRUE, TRUE);
for (i = 0; i < n_columns; i++)
{
if (!clutter_model_check_type (types[i]))
{
g_warning ("%s: Invalid type %s\n", G_STRLOC, g_type_name (types[i]));
g_object_unref (model);
return NULL;
}
clutter_model_set_column_type (model, i, types[i]);
clutter_model_set_column_name (model, i, names[i]);
}
return model;
}
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