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/* gtkrbtree.h
* Copyright (C) 2000 Red Hat, Inc., Jonathan Blandford <jrb@redhat.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/

/* A Red-Black Tree implementation used specifically by GtkTreeView.
*/
#ifndef __GTK_RBTREE_H__
#define __GTK_RBTREE_H__

#include <glib.h>


G_BEGIN_DECLS


typedef enum
{
  GTK_RBNODE_BLACK = 1 << 0,
  GTK_RBNODE_RED = 1 << 1,
  GTK_RBNODE_IS_PARENT = 1 << 2,
  GTK_RBNODE_IS_SELECTED = 1 << 3,
  GTK_RBNODE_IS_PRELIT = 1 << 4,
  GTK_RBNODE_INVALID = 1 << 7,
  GTK_RBNODE_COLUMN_INVALID = 1 << 8,
  GTK_RBNODE_DESCENDANTS_INVALID = 1 << 9,
  GTK_RBNODE_NON_COLORS = GTK_RBNODE_IS_PARENT |
   GTK_RBNODE_IS_SELECTED |
   GTK_RBNODE_IS_PRELIT |
                          GTK_RBNODE_INVALID |
                          GTK_RBNODE_COLUMN_INVALID |
                          GTK_RBNODE_DESCENDANTS_INVALID
} GtkRBNodeColor;

typedef struct _GtkRBTree GtkRBTree;
typedef struct _GtkRBNode GtkRBNode;
typedef struct _GtkRBTreeView GtkRBTreeView;

typedef void (*GtkRBTreeTraverseFunc) (GtkRBTree *tree,
                                       GtkRBNode *node,
                                       gpointer data);

struct _GtkRBTree
{
  GtkRBNode *root;
  GtkRBTree *parent_tree;
  GtkRBNode *parent_node;
};

struct _GtkRBNode
{
  guint flags : 14;

  GtkRBNode *left;
  GtkRBNode *right;
  GtkRBNode *parent;

  /* count is the number of nodes beneath us, plus 1 for ourselves.
* i.e. node->left->count + node->right->count + 1
*/
  gint count;
  /* count the number of total nodes beneath us, including nodes
* of children trees.
* i.e. node->left->count + node->right->count + node->children->root->count + 1
*/
  guint total_count;
  
  /* this is the total of sizes of
* node->left, node->right, our own height, and the height
* of all trees in ->children, iff children exists because
* the thing is expanded.
*/
  gint offset;

  /* Child trees */
  GtkRBTree *children;
};


#define GTK_RBNODE_GET_COLOR(node) (node?(((node->flags&GTK_RBNODE_RED)==GTK_RBNODE_RED)?GTK_RBNODE_RED:GTK_RBNODE_BLACK):GTK_RBNODE_BLACK)
#define GTK_RBNODE_SET_COLOR(node,color) if((node->flags&color)!=color)node->flags=node->flags^(GTK_RBNODE_RED|GTK_RBNODE_BLACK)
#define GTK_RBNODE_GET_HEIGHT(node) (node->offset-(node->left->offset+node->right->offset+(node->children?node->children->root->offset:0)))
#define GTK_RBNODE_SET_FLAG(node, flag) G_STMT_START{ (node->flags|=flag); }G_STMT_END
#define GTK_RBNODE_UNSET_FLAG(node, flag) G_STMT_START{ (node->flags&=~(flag)); }G_STMT_END
#define GTK_RBNODE_FLAG_SET(node, flag) (node?(((node->flags&flag)==flag)?TRUE:FALSE):FALSE)


GtkRBTree *_gtk_rbtree_new (void);
void _gtk_rbtree_free (GtkRBTree *tree);
void _gtk_rbtree_remove (GtkRBTree *tree);
void _gtk_rbtree_destroy (GtkRBTree *tree);
GtkRBNode *_gtk_rbtree_insert_before (GtkRBTree *tree,
GtkRBNode *node,
gint height,
gboolean valid);
GtkRBNode *_gtk_rbtree_insert_after (GtkRBTree *tree,
GtkRBNode *node,
gint height,
gboolean valid);
void _gtk_rbtree_remove_node (GtkRBTree *tree,
GtkRBNode *node);
gboolean _gtk_rbtree_is_nil (GtkRBNode *node);
void _gtk_rbtree_reorder (GtkRBTree *tree,
gint *new_order,
gint length);
gboolean _gtk_rbtree_contains (GtkRBTree *tree,
                                         GtkRBTree *potential_child);
GtkRBNode *_gtk_rbtree_find_count (GtkRBTree *tree,
gint count);
void _gtk_rbtree_node_set_height (GtkRBTree *tree,
GtkRBNode *node,
gint height);
void _gtk_rbtree_node_mark_invalid(GtkRBTree *tree,
GtkRBNode *node);
void _gtk_rbtree_node_mark_valid (GtkRBTree *tree,
GtkRBNode *node);
void _gtk_rbtree_column_invalid (GtkRBTree *tree);
void _gtk_rbtree_mark_invalid (GtkRBTree *tree);
void _gtk_rbtree_set_fixed_height (GtkRBTree *tree,
gint height,
gboolean mark_valid);
gint _gtk_rbtree_node_find_offset (GtkRBTree *tree,
GtkRBNode *node);
guint _gtk_rbtree_node_get_index (GtkRBTree *tree,
GtkRBNode *node);
gboolean _gtk_rbtree_find_index (GtkRBTree *tree,
guint index,
GtkRBTree **new_tree,
GtkRBNode **new_node);
gint _gtk_rbtree_find_offset (GtkRBTree *tree,
gint offset,
GtkRBTree **new_tree,
GtkRBNode **new_node);
void _gtk_rbtree_traverse (GtkRBTree *tree,
GtkRBNode *node,
GTraverseType order,
GtkRBTreeTraverseFunc func,
gpointer data);
GtkRBNode *_gtk_rbtree_first (GtkRBTree *tree);
GtkRBNode *_gtk_rbtree_next (GtkRBTree *tree,
GtkRBNode *node);
GtkRBNode *_gtk_rbtree_prev (GtkRBTree *tree,
GtkRBNode *node);
void _gtk_rbtree_next_full (GtkRBTree *tree,
GtkRBNode *node,
GtkRBTree **new_tree,
GtkRBNode **new_node);
void _gtk_rbtree_prev_full (GtkRBTree *tree,
GtkRBNode *node,
GtkRBTree **new_tree,
GtkRBNode **new_node);

gint _gtk_rbtree_get_depth (GtkRBTree *tree);


G_END_DECLS


#endif /* __GTK_RBTREE_H__ */
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