Pileus Git - ~andy/gtk/blob - gtk/gtkrbtree.h

   1 /* gtkrbtree.h
   2  * Copyright (C) 2000  Red Hat, Inc.,  Jonathan Blandford <jrb@redhat.com>
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Library General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19
  20 /* A Red-Black Tree implementation used specifically by GtkTreeView.
  21  */
  22 #ifndef __GTK_RBTREE_H__
  23 #define __GTK_RBTREE_H__
  24
  25 #include <glib.h>
  26
  27
  28 G_BEGIN_DECLS
  29
  30
  31 typedef enum
  32 {
  33   GTK_RBNODE_BLACK = 1 << 0,
  34   GTK_RBNODE_RED = 1 << 1,
  35   GTK_RBNODE_IS_PARENT = 1 << 2,
  36   GTK_RBNODE_IS_SELECTED = 1 << 3,
  37   GTK_RBNODE_IS_PRELIT = 1 << 4,
  38   GTK_RBNODE_INVALID = 1 << 7,
  39   GTK_RBNODE_COLUMN_INVALID = 1 << 8,
  40   GTK_RBNODE_DESCENDANTS_INVALID = 1 << 9,
  41   GTK_RBNODE_NON_COLORS = GTK_RBNODE_IS_PARENT |
  42                           GTK_RBNODE_IS_SELECTED |
  43                           GTK_RBNODE_IS_PRELIT |
  44                           GTK_RBNODE_INVALID |
  45                           GTK_RBNODE_COLUMN_INVALID |
  46                           GTK_RBNODE_DESCENDANTS_INVALID
  47 } GtkRBNodeColor;
  48
  49 typedef struct _GtkRBTree GtkRBTree;
  50 typedef struct _GtkRBNode GtkRBNode;
  51 typedef struct _GtkRBTreeView GtkRBTreeView;
  52
  53 typedef void (*GtkRBTreeTraverseFunc) (GtkRBTree  *tree,
  54                                        GtkRBNode  *node,
  55                                        gpointer  data);
  56
  57 struct _GtkRBTree
  58 {
  59   GtkRBNode *root;
  60   GtkRBNode *nil;
  61   GtkRBTree *parent_tree;
  62   GtkRBNode *parent_node;
  63 };
  64
  65 struct _GtkRBNode
  66 {
  67   guint flags : 14;
  68
  69   /* We keep track of whether the aggregate count of children plus 1
  70    * for the node itself comes to an even number.  The parity flag is
  71    * the total count of children mod 2, where the total count of
  72    * children gets computed in the same way that the total offset gets
  73    * computed. i.e. not the same as the "count" field below which
  74    * doesn't include children. We could replace parity with a
  75    * full-size int field here, and then take % 2 to get the parity flag,
  76    * but that would use extra memory.
  77    */
  78
  79   guint parity : 1;
  80
  81   GtkRBNode *left;
  82   GtkRBNode *right;
  83   GtkRBNode *parent;
  84
  85   /* count is the number of nodes beneath us, plus 1 for ourselves.
  86    * i.e. node->left->count + node->right->count + 1
  87    */
  88   gint count;
  89
  90   /* this is the total of sizes of
  91    * node->left, node->right, our own height, and the height
  92    * of all trees in ->children, iff children exists because
  93    * the thing is expanded.
  94    */
  95   gint offset;
  96
  97   /* Child trees */
  98   GtkRBTree *children;
  99 };
 100
 101
 102 #define GTK_RBNODE_GET_COLOR(node)              (node?(((node->flags&GTK_RBNODE_RED)==GTK_RBNODE_RED)?GTK_RBNODE_RED:GTK_RBNODE_BLACK):GTK_RBNODE_BLACK)
 103 #define GTK_RBNODE_SET_COLOR(node,color)        if((node->flags&color)!=color)node->flags=node->flags^(GTK_RBNODE_RED|GTK_RBNODE_BLACK)
 104 #define GTK_RBNODE_GET_HEIGHT(node)             (node->offset-(node->left->offset+node->right->offset+(node->children?node->children->root->offset:0)))
 105 #define GTK_RBNODE_SET_FLAG(node, flag)         G_STMT_START{ (node->flags|=flag); }G_STMT_END
 106 #define GTK_RBNODE_UNSET_FLAG(node, flag)       G_STMT_START{ (node->flags&=~(flag)); }G_STMT_END
 107 #define GTK_RBNODE_FLAG_SET(node, flag)         (node?(((node->flags&flag)==flag)?TRUE:FALSE):FALSE)
 108
 109
 110 GtkRBTree *_gtk_rbtree_new              (void);
 111 void       _gtk_rbtree_free             (GtkRBTree              *tree);
 112 void       _gtk_rbtree_remove           (GtkRBTree              *tree);
 113 void       _gtk_rbtree_destroy          (GtkRBTree              *tree);
 114 GtkRBNode *_gtk_rbtree_insert_before    (GtkRBTree              *tree,
 115                                          GtkRBNode              *node,
 116                                          gint                    height,
 117                                          gboolean                valid);
 118 GtkRBNode *_gtk_rbtree_insert_after     (GtkRBTree              *tree,
 119                                          GtkRBNode              *node,
 120                                          gint                    height,
 121                                          gboolean                valid);
 122 void       _gtk_rbtree_remove_node      (GtkRBTree              *tree,
 123                                          GtkRBNode              *node);
 124 void       _gtk_rbtree_reorder          (GtkRBTree              *tree,
 125                                          gint                   *new_order,
 126                                          gint                    length);
 127 GtkRBNode *_gtk_rbtree_find_count       (GtkRBTree              *tree,
 128                                          gint                    count);
 129 void       _gtk_rbtree_node_set_height  (GtkRBTree              *tree,
 130                                          GtkRBNode              *node,
 131                                          gint                    height);
 132 void       _gtk_rbtree_node_mark_invalid(GtkRBTree              *tree,
 133                                          GtkRBNode              *node);
 134 void       _gtk_rbtree_node_mark_valid  (GtkRBTree              *tree,
 135                                          GtkRBNode              *node);
 136 void       _gtk_rbtree_column_invalid   (GtkRBTree              *tree);
 137 void       _gtk_rbtree_mark_invalid     (GtkRBTree              *tree);
 138 void       _gtk_rbtree_set_fixed_height (GtkRBTree              *tree,
 139                                          gint                    height,
 140                                          gboolean                mark_valid);
 141 gint       _gtk_rbtree_node_find_offset (GtkRBTree              *tree,
 142                                          GtkRBNode              *node);
 143 gint       _gtk_rbtree_node_find_parity (GtkRBTree              *tree,
 144                                          GtkRBNode              *node);
 145 gint       _gtk_rbtree_find_offset      (GtkRBTree              *tree,
 146                                          gint                    offset,
 147                                          GtkRBTree             **new_tree,
 148                                          GtkRBNode             **new_node);
 149 void       _gtk_rbtree_traverse         (GtkRBTree              *tree,
 150                                          GtkRBNode              *node,
 151                                          GTraverseType           order,
 152                                          GtkRBTreeTraverseFunc   func,
 153                                          gpointer                data);
 154 GtkRBNode *_gtk_rbtree_next             (GtkRBTree              *tree,
 155                                          GtkRBNode              *node);
 156 GtkRBNode *_gtk_rbtree_prev             (GtkRBTree              *tree,
 157                                          GtkRBNode              *node);
 158 void       _gtk_rbtree_next_full        (GtkRBTree              *tree,
 159                                          GtkRBNode              *node,
 160                                          GtkRBTree             **new_tree,
 161                                          GtkRBNode             **new_node);
 162 void       _gtk_rbtree_prev_full        (GtkRBTree              *tree,
 163                                          GtkRBNode              *node,
 164                                          GtkRBTree             **new_tree,
 165                                          GtkRBNode             **new_node);
 166
 167 gint       _gtk_rbtree_get_depth        (GtkRBTree              *tree);
 168
 169 /* This func checks the integrity of the tree */
 170 #ifdef G_ENABLE_DEBUG
 171 void       _gtk_rbtree_test             (const gchar            *where,
 172                                          GtkRBTree              *tree);
 173 void       _gtk_rbtree_debug_spew       (GtkRBTree              *tree);
 174 #endif
 175
 176
 177 G_END_DECLS
 178
 179
 180 #endif /* __GTK_RBTREE_H__ */