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treeview-tutorial-xml/examples/custom-list-model-sorted/custom-list.c

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Initial commit This is the latest version found at http://scentric.net/tutorial/treeview-tutorial-xml.tar.gz
2014-07-22 23:28:11 +00:00
/***********************************************************
*
* custom-list.c
*
* A simple custom list model with sorting
*
* part of the Gtk+ tree view tutorial
*
* by Tim-Philipp Mueller < tim at centricular dot net >
*
***********************************************************/
#include "custom-list.h"
/* boring declarations of local functions */
static void custom_list_init (CustomList *pkg_tree);
static void custom_list_class_init (CustomListClass *klass);
static void custom_list_tree_model_init (GtkTreeModelIface *iface);
static void custom_list_finalize (GObject *object);
static GtkTreeModelFlags custom_list_get_flags (GtkTreeModel *tree_model);
static gint custom_list_get_n_columns (GtkTreeModel *tree_model);
static GType custom_list_get_column_type (GtkTreeModel *tree_model,
gint index);
static gboolean custom_list_get_iter (GtkTreeModel *tree_model,
GtkTreeIter *iter,
GtkTreePath *path);
static GtkTreePath *custom_list_get_path (GtkTreeModel *tree_model,
GtkTreeIter *iter);
static void custom_list_get_value (GtkTreeModel *tree_model,
GtkTreeIter *iter,
gint column,
GValue *value);
static gboolean custom_list_iter_next (GtkTreeModel *tree_model,
GtkTreeIter *iter);
static gboolean custom_list_iter_children (GtkTreeModel *tree_model,
GtkTreeIter *iter,
GtkTreeIter *parent);
static gboolean custom_list_iter_has_child (GtkTreeModel *tree_model,
GtkTreeIter *iter);
static gint custom_list_iter_n_children (GtkTreeModel *tree_model,
GtkTreeIter *iter);
static gboolean custom_list_iter_nth_child (GtkTreeModel *tree_model,
GtkTreeIter *iter,
GtkTreeIter *parent,
gint n);
static gboolean custom_list_iter_parent (GtkTreeModel *tree_model,
GtkTreeIter *iter,
GtkTreeIter *child);
/* -- GtkTreeSortable interface functions -- */
static void custom_list_sortable_init (GtkTreeSortableIface *iface);
static gboolean custom_list_sortable_get_sort_column_id (GtkTreeSortable *sortable,
gint *sort_col_id,
GtkSortType *order);
static void custom_list_sortable_set_sort_column_id (GtkTreeSortable *sortable,
gint sort_col_id,
GtkSortType order);
static void custom_list_sortable_set_sort_func (GtkTreeSortable *sortable,
gint sort_col_id,
GtkTreeIterCompareFunc sort_func,
gpointer user_data,
GtkDestroyNotify destroy_func);
static void custom_list_sortable_set_default_sort_func (GtkTreeSortable *sortable,
GtkTreeIterCompareFunc sort_func,
gpointer user_data,
GtkDestroyNotify destroy_func);
static gboolean custom_list_sortable_has_default_sort_func (GtkTreeSortable *sortable);
static void custom_list_resort (CustomList *custom_list);
static GObjectClass *parent_class = NULL; /* GObject stuff - nothing to worry about */
/*****************************************************************************
*
* custom_list_get_type: here we register our new type and its interfaces
* with the type system. If you want to implement
* additional interfaces, you will need to do it here.
*
*****************************************************************************/
GType
custom_list_get_type (void)
{
static GType custom_list_type = 0;
if (custom_list_type)
return custom_list_type;
/* Some boilerplate type registration stuff */
if (1)
{
static const GTypeInfo custom_list_info =
{
sizeof (CustomListClass),
NULL, /* base_init */
NULL, /* base_finalize */
(GClassInitFunc) custom_list_class_init,
NULL, /* class finalize */
NULL, /* class_data */
sizeof (CustomList),
0, /* n_preallocs */
(GInstanceInitFunc) custom_list_init
};
custom_list_type = g_type_register_static (G_TYPE_OBJECT, "CustomList",
&custom_list_info, (GTypeFlags)0);
}
/* Here we register our GtkTreeModel interface with the type system */
if (1)
{
static const GInterfaceInfo tree_model_info =
{
(GInterfaceInitFunc) custom_list_tree_model_init,
NULL,
NULL
};
g_type_add_interface_static (custom_list_type, GTK_TYPE_TREE_MODEL, &tree_model_info);
}
/* Add GtkTreeSortable interface */
if (1)
{
static const GInterfaceInfo tree_sortable_info =
{
(GInterfaceInitFunc) custom_list_sortable_init,
NULL,
NULL
};
g_type_add_interface_static (custom_list_type, GTK_TYPE_TREE_SORTABLE, &tree_sortable_info);
}
return custom_list_type;
}
/*****************************************************************************
*
* custom_list_class_init: more boilerplate GObject/GType stuff.
* Init callback for the type system,
* called once when our new class is created.
*
*****************************************************************************/
static void
custom_list_class_init (CustomListClass *klass)
{
GObjectClass *object_class;
parent_class = (GObjectClass*) g_type_class_peek_parent (klass);
object_class = (GObjectClass*) klass;
object_class->finalize = custom_list_finalize;
}
/*****************************************************************************
*
* custom_list_tree_model_init: init callback for the interface registration
* in custom_list_get_type. Here we override
* the GtkTreeModel interface functions that
* we implement.
*
*****************************************************************************/
static void
custom_list_tree_model_init (GtkTreeModelIface *iface)
{
iface->get_flags = custom_list_get_flags;
iface->get_n_columns = custom_list_get_n_columns;
iface->get_column_type = custom_list_get_column_type;
iface->get_iter = custom_list_get_iter;
iface->get_path = custom_list_get_path;
iface->get_value = custom_list_get_value;
iface->iter_next = custom_list_iter_next;
iface->iter_children = custom_list_iter_children;
iface->iter_has_child = custom_list_iter_has_child;
iface->iter_n_children = custom_list_iter_n_children;
iface->iter_nth_child = custom_list_iter_nth_child;
iface->iter_parent = custom_list_iter_parent;
}
/*****************************************************************************
*
* custom_list_sortable_init: init callback for the interface registration
* in custom_list_get_type. Here we override
* the GtkTreeSortable interface functions that
* we implement.
*
*****************************************************************************/
static void
custom_list_sortable_init (GtkTreeSortableIface *iface)
{
iface->get_sort_column_id = custom_list_sortable_get_sort_column_id;
iface->set_sort_column_id = custom_list_sortable_set_sort_column_id;
iface->set_sort_func = custom_list_sortable_set_sort_func; /* NOT SUPPORTED */
iface->set_default_sort_func = custom_list_sortable_set_default_sort_func; /* NOT SUPPORTED */
iface->has_default_sort_func = custom_list_sortable_has_default_sort_func; /* NOT SUPPORTED */
}
/*****************************************************************************
*
* custom_list_init: this is called everytime a new custom list object
* instance is created (we do that in custom_list_new).
* Initialise your list structure's fields here.
*
*****************************************************************************/
static void
custom_list_init (CustomList *custom_list)
{
custom_list->n_columns = CUSTOM_LIST_N_COLUMNS;
custom_list->column_types[0] = G_TYPE_POINTER; /* CUSTOM_LIST_COL_RECORD */
custom_list->column_types[1] = G_TYPE_STRING; /* CUSTOM_LIST_COL_NAME */
custom_list->column_types[2] = G_TYPE_UINT; /* CUSTOM_LIST_COL_YEAR_BORN */
g_assert ( CUSTOM_LIST_N_COLUMNS == 3 );
custom_list->num_rows = 0;
custom_list->rows = NULL;
custom_list->stamp = g_random_int(); /* Random int to check whether iters belong to out model */
custom_list->sort_id = SORT_ID_NONE;
custom_list->sort_order = GTK_SORT_ASCENDING;
}
/*****************************************************************************
*
* custom_list_finalize: this is called just before a custom list is
* destroyed. Free dynamically allocated memory here.
*
*****************************************************************************/
static void
custom_list_finalize (GObject *object)
{
/* CustomList *custom_list = CUSTOM_LIST(object); */
/* free all records and free all memory used by the list */
#warning IMPLEMENT
/* must chain up - finalize parent */
(* parent_class->finalize) (object);
}
/*****************************************************************************
*
* custom_list_get_flags: tells the rest of the world whether our tree model
* has any special characteristics. In our case,
* we have a list model (instead of a tree), and each
* tree iter is valid as long as the row in question
* exists, as it only contains a pointer to our struct.
*
*****************************************************************************/
static GtkTreeModelFlags
custom_list_get_flags (GtkTreeModel *tree_model)
{
g_return_val_if_fail (CUSTOM_IS_LIST(tree_model), (GtkTreeModelFlags)0);
return (GTK_TREE_MODEL_LIST_ONLY | GTK_TREE_MODEL_ITERS_PERSIST);
}
/*****************************************************************************
*
* custom_list_get_n_columns: tells the rest of the world how many data
* columns we export via the tree model interface
*
*****************************************************************************/
static gint
custom_list_get_n_columns (GtkTreeModel *tree_model)
{
g_return_val_if_fail (CUSTOM_IS_LIST(tree_model), 0);
return CUSTOM_LIST(tree_model)->n_columns;
}
/*****************************************************************************
*
* custom_list_get_column_type: tells the rest of the world which type of
* data an exported model column contains
*
*****************************************************************************/
static GType
custom_list_get_column_type (GtkTreeModel *tree_model,
gint index)
{
g_return_val_if_fail (CUSTOM_IS_LIST(tree_model), G_TYPE_INVALID);
g_return_val_if_fail (index < CUSTOM_LIST(tree_model)->n_columns && index >= 0, G_TYPE_INVALID);
return CUSTOM_LIST(tree_model)->column_types[index];
}
/*****************************************************************************
*
* custom_list_get_iter: converts a tree path (physical position) into a
* tree iter structure (the content of the iter
* fields will only be used internally by our model).
* We simply store a pointer to our CustomRecord
* structure that represents that row in the tree iter.
*
*****************************************************************************/
static gboolean
custom_list_get_iter (GtkTreeModel *tree_model,
GtkTreeIter *iter,
GtkTreePath *path)
{
CustomList *custom_list;
CustomRecord *record;
gint *indices, n, depth;
g_assert(CUSTOM_IS_LIST(tree_model));
g_assert(path!=NULL);
custom_list = CUSTOM_LIST(tree_model);
indices = gtk_tree_path_get_indices(path);
depth = gtk_tree_path_get_depth(path);
/* we do not allow children */
g_assert(depth == 1); /* depth 1 = top level; a list only has top level nodes and no children */
n = indices[0]; /* the n-th top level row */
if ( n >= custom_list->num_rows || n < 0 )
return FALSE;
record = custom_list->rows[n];
g_assert(record != NULL);
g_assert(record->pos == n);
/* We simply store a pointer to our custom record in the iter */
iter->stamp = custom_list->stamp;
iter->user_data = record;
iter->user_data2 = NULL; /* unused */
iter->user_data3 = NULL; /* unused */
return TRUE;
}
/*****************************************************************************
*
* custom_list_get_path: converts a tree iter into a tree path (ie. the
* physical position of that row in the list).
*
*****************************************************************************/
static GtkTreePath *
custom_list_get_path (GtkTreeModel *tree_model,
GtkTreeIter *iter)
{
GtkTreePath *path;
CustomRecord *record;
CustomList *custom_list;
g_return_val_if_fail (CUSTOM_IS_LIST(tree_model), NULL);
g_return_val_if_fail (iter != NULL, NULL);
g_return_val_if_fail (iter->user_data != NULL, NULL);
custom_list = CUSTOM_LIST(tree_model);
record = (CustomRecord*) iter->user_data;
path = gtk_tree_path_new();
gtk_tree_path_append_index(path, record->pos);
return path;
}
/*****************************************************************************
*
* custom_list_get_value: Returns a row's exported data columns
* (_get_value is what gtk_tree_model_get uses)
*
*****************************************************************************/
static void
custom_list_get_value (GtkTreeModel *tree_model,
GtkTreeIter *iter,
gint column,
GValue *value)
{
CustomRecord *record;
CustomList *custom_list;
g_return_if_fail (CUSTOM_IS_LIST (tree_model));
g_return_if_fail (iter != NULL);
g_return_if_fail (column < CUSTOM_LIST(tree_model)->n_columns);
g_value_init (value, CUSTOM_LIST(tree_model)->column_types[column]);
custom_list = CUSTOM_LIST(tree_model);
record = (CustomRecord*) iter->user_data;
g_return_if_fail ( record != NULL );
if(record->pos >= custom_list->num_rows)
g_return_if_reached();
switch(column)
{
case CUSTOM_LIST_COL_RECORD:
g_value_set_pointer(value, record);
break;
case CUSTOM_LIST_COL_NAME:
g_value_set_string(value, record->name);
break;
case CUSTOM_LIST_COL_YEAR_BORN:
g_value_set_uint(value, record->year_born);
break;
}
}
/*****************************************************************************
*
* custom_list_iter_next: Takes an iter structure and sets it to point
* to the next row.
*
*****************************************************************************/
static gboolean
custom_list_iter_next (GtkTreeModel *tree_model,
GtkTreeIter *iter)
{
CustomRecord *record, *nextrecord;
CustomList *custom_list;
g_return_val_if_fail (CUSTOM_IS_LIST (tree_model), FALSE);
if (iter == NULL || iter->user_data == NULL)
return FALSE;
custom_list = CUSTOM_LIST(tree_model);
record = (CustomRecord *) iter->user_data;
/* Is this the last record in the list? */
if ((record->pos + 1) >= custom_list->num_rows)
return FALSE;
nextrecord = custom_list->rows[(record->pos + 1)];
g_assert ( nextrecord != NULL );
g_assert ( nextrecord->pos == (record->pos + 1) );
iter->stamp = custom_list->stamp;
iter->user_data = nextrecord;
return TRUE;
}
/*****************************************************************************
*
* custom_list_iter_children: Returns TRUE or FALSE depending on whether
* the row specified by 'parent' has any children.
* If it has children, then 'iter' is set to
* point to the first child. Special case: if
* 'parent' is NULL, then the first top-level
* row should be returned if it exists.
*
*****************************************************************************/
static gboolean
custom_list_iter_children (GtkTreeModel *tree_model,
GtkTreeIter *iter,
GtkTreeIter *parent)
{
CustomList *custom_list;
g_return_val_if_fail (parent == NULL || parent->user_data != NULL, FALSE);
/* this is a list, nodes have no children */
if (parent)
return FALSE;
/* parent == NULL is a special case; we need to return the first top-level row */
g_return_val_if_fail (CUSTOM_IS_LIST (tree_model), FALSE);
custom_list = CUSTOM_LIST(tree_model);
/* No rows => no first row */
if (custom_list->num_rows == 0)
return FALSE;
/* Set iter to first item in list */
iter->stamp = custom_list->stamp;
iter->user_data = custom_list->rows[0];
return TRUE;
}
/*****************************************************************************
*
* custom_list_iter_has_child: Returns TRUE or FALSE depending on whether
* the row specified by 'iter' has any children.
* We only have a list and thus no children.
*
*****************************************************************************/
static gboolean
custom_list_iter_has_child (GtkTreeModel *tree_model,
GtkTreeIter *iter)
{
return FALSE;
}
/*****************************************************************************
*
* custom_list_iter_n_children: Returns the number of children the row
* specified by 'iter' has. This is usually 0,
* as we only have a list and thus do not have
* any children to any rows. A special case is
* when 'iter' is NULL, in which case we need
* to return the number of top-level nodes,
* ie. the number of rows in our list.
*
*****************************************************************************/
static gint
custom_list_iter_n_children (GtkTreeModel *tree_model,
GtkTreeIter *iter)
{
CustomList *custom_list;
g_return_val_if_fail (CUSTOM_IS_LIST (tree_model), -1);
g_return_val_if_fail (iter == NULL || iter->user_data != NULL, FALSE);
custom_list = CUSTOM_LIST(tree_model);
/* special case: if iter == NULL, return number of top-level rows */
if (!iter)
return custom_list->num_rows;
return 0; /* otherwise, this is easy again for a list */
}
/*****************************************************************************
*
* custom_list_iter_nth_child: If the row specified by 'parent' has any
* children, set 'iter' to the n-th child and
* return TRUE if it exists, otherwise FALSE.
* A special case is when 'parent' is NULL, in
* which case we need to set 'iter' to the n-th
* row if it exists.
*
*****************************************************************************/
static gboolean
custom_list_iter_nth_child (GtkTreeModel *tree_model,
GtkTreeIter *iter,
GtkTreeIter *parent,
gint n)
{
CustomRecord *record;
CustomList *custom_list;
g_return_val_if_fail (CUSTOM_IS_LIST (tree_model), FALSE);
custom_list = CUSTOM_LIST(tree_model);
/* a list has only top-level rows */
if(parent)
return FALSE;
/* special case: if parent == NULL, set iter to n-th top-level row */
if( n >= custom_list->num_rows )
return FALSE;
record = custom_list->rows[n];
g_assert( record != NULL );
g_assert( record->pos == n );
iter->stamp = custom_list->stamp;
iter->user_data = record;
return TRUE;
}
/*****************************************************************************
*
* custom_list_iter_parent: Point 'iter' to the parent node of 'child'. As
* we have a list and thus no children and no
* parents of children, we can just return FALSE.
*
*****************************************************************************/
static gboolean
custom_list_iter_parent (GtkTreeModel *tree_model,
GtkTreeIter *iter,
GtkTreeIter *child)
{
return FALSE;
}
/*****************************************************************************
*
* custom_list_sortable_get_sort_column_id
*
*****************************************************************************/
static gboolean
custom_list_sortable_get_sort_column_id (GtkTreeSortable *sortable,
gint *sort_col_id,
GtkSortType *order)
{
CustomList *custom_list;
g_return_val_if_fail ( sortable != NULL , FALSE );
g_return_val_if_fail ( CUSTOM_IS_LIST(sortable), FALSE );
custom_list = CUSTOM_LIST(sortable);
if (sort_col_id)
*sort_col_id = custom_list->sort_id;
if (order)
*order = custom_list->sort_order;
return TRUE;
}
/*****************************************************************************
*
* custom_list_sortable_set_sort_column_id
*
*****************************************************************************/
static void
custom_list_sortable_set_sort_column_id (GtkTreeSortable *sortable,
gint sort_col_id,
GtkSortType order)
{
CustomList *custom_list;
g_return_if_fail ( sortable != NULL );
g_return_if_fail ( CUSTOM_IS_LIST(sortable) );
custom_list = CUSTOM_LIST(sortable);
if (custom_list->sort_id == sort_col_id && custom_list->sort_order == order)
return;
custom_list->sort_id = sort_col_id;
custom_list->sort_order = order;
custom_list_resort(custom_list);
}
/*****************************************************************************
*
* custom_list_sortable_set_sort_func: We have our own built-in sort function
*
*****************************************************************************/
static void
custom_list_sortable_set_sort_func (GtkTreeSortable *sortable,
gint sort_col_id,
GtkTreeIterCompareFunc sort_func,
gpointer user_data,
GtkDestroyNotify destroy_func)
{
g_warning ("%s is not supported by the CustomList model.\n", __FUNCTION__);
}
/*****************************************************************************
*
* custom_list_sortable_set_default_sort_func: We have our own built-in
* sort function
*
*****************************************************************************/
static void
custom_list_sortable_set_default_sort_func (GtkTreeSortable *sortable,
GtkTreeIterCompareFunc sort_func,
gpointer user_data,
GtkDestroyNotify destroy_func)
{
g_warning ("%s is not supported by the CustomList model.\n", __FUNCTION__);
}
/*****************************************************************************
*
* custom_list_sortable_has_default_sort_func
*
*****************************************************************************/
static gboolean
custom_list_sortable_has_default_sort_func (GtkTreeSortable *sortable)
{
return FALSE;
}
/*****************************************************************************
*
* custom_list_compare_records
*
*****************************************************************************/
static gint
custom_list_compare_records (gint sort_id, CustomRecord *a, CustomRecord *b)
{
switch(sort_id)
{
case SORT_ID_NONE:
return 0;
case SORT_ID_NAME:
{
if ((a->name) && (b->name))
return g_utf8_collate(a->name, b->name);
if (a->name == b->name)
return 0; /* both are NULL */
else
return (a->name == NULL) ? -1 : 1;
}
case SORT_ID_YEAR_BORN:
{
if (a->year_born == b->year_born)
return 0;
return (a->year_born > b->year_born) ? 1 : -1;
}
}
g_return_val_if_reached(0);
}
/*****************************************************************************
*
* custom_list_qsort_compare_func
*
*****************************************************************************/
static gint
custom_list_qsort_compare_func (CustomRecord **a, CustomRecord **b, CustomList *custom_list)
{
gint ret;
g_assert ((a) && (b) && (custom_list));
ret = custom_list_compare_records(custom_list->sort_id, *a, *b);
/* Swap -1 and 1 if sort order is reverse */
if (ret != 0 && custom_list->sort_order == GTK_SORT_DESCENDING)
ret = (ret < 0) ? 1 : -1;
return ret;
}
/*****************************************************************************
*
* custom_list_resort: resort the list. Pay attention to how we emit the
* "rows-reordered" signal after we have resorted the
* list. This function could be optimised to speed up
* mass insertions via a timeout or something.
*
*****************************************************************************/
static void
custom_list_resort (CustomList *custom_list)
{
GtkTreePath *path;
gint *neworder, i;
g_return_if_fail ( custom_list != NULL );
g_return_if_fail ( CUSTOM_IS_LIST(custom_list) );
if (custom_list->sort_id == SORT_ID_NONE)
return;
if (custom_list->num_rows == 0)
return;
/* resort */
g_qsort_with_data(custom_list->rows,
custom_list->num_rows,
sizeof(CustomRecord*),
(GCompareDataFunc) custom_list_qsort_compare_func,
custom_list);
/* let other objects know about the new order */
neworder = g_new0(gint, custom_list->num_rows);
/* NOTE that the API reference for
* gtk_tree_model_rows_reordered()
* might be wrong here, see bug
* number 124790 on bugs.gnome.org.
* Both will work, but one will give
* you 'jumpy' selections after a
* reordering */
for (i = 0; i < custom_list->num_rows; ++i)
{
/* neworder[(custom_list->rows[i])->pos] = i; */
neworder[i] = (custom_list->rows[i])->pos;
(custom_list->rows[i])->pos = i;
}
path = gtk_tree_path_new();
gtk_tree_model_rows_reordered(GTK_TREE_MODEL(custom_list), path, NULL, neworder);
gtk_tree_path_free(path);
g_free(neworder);
}
/*****************************************************************************
*
* custom_list_new: This is what you use in your own code to create a
* new custom list tree model for you to use.
*
*****************************************************************************/
CustomList *
custom_list_new (void)
{
CustomList *newcustomlist;
newcustomlist = (CustomList*) g_object_new (CUSTOM_TYPE_LIST, NULL);
g_assert( newcustomlist != NULL );
return newcustomlist;
}
/*****************************************************************************
*
* custom_list_append_record: Empty lists are boring. This function can
* be used in your own code to add rows to the
* list. Note how we emit the "row-inserted"
* signal after we have appended the row
* internally, so the tree view and other
* interested objects know about the new row.
*
*****************************************************************************/
void
custom_list_append_record (CustomList *custom_list,
const gchar *name,
guint year_born)
{
GtkTreeIter iter;
GtkTreePath *path;
CustomRecord *newrecord;
gulong newsize;
guint pos;
g_return_if_fail (CUSTOM_IS_LIST(custom_list));
g_return_if_fail (name != NULL);
pos = custom_list->num_rows;
custom_list->num_rows++;
newsize = custom_list->num_rows * sizeof(CustomRecord*);
custom_list->rows = g_realloc(custom_list->rows, newsize);
newrecord = g_new0(CustomRecord, 1);
newrecord->name = g_strdup(name);
newrecord->name_collate_key = g_utf8_collate_key(name,-1); /* for fast sorting, used later */
newrecord->year_born = year_born;
custom_list->rows[pos] = newrecord;
newrecord->pos = pos;
/* inform the tree view and other interested objects
* (e.g. tree row references) that we have inserted
* a new row, and where it was inserted */
path = gtk_tree_path_new();
gtk_tree_path_append_index(path, newrecord->pos);
custom_list_get_iter(GTK_TREE_MODEL(custom_list), &iter, path);
gtk_tree_model_row_inserted(GTK_TREE_MODEL(custom_list), path, &iter);
gtk_tree_path_free(path);
}
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