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 #ifdef __cplusplus
  26 extern "C" {
  27 #endif /* __cplusplus */
  28
  29 #include <glib.h>
  30 typedef enum
  31 {
  32   GTK_RBNODE_BLACK = 1 << 0,
  33   GTK_RBNODE_RED = 1 << 1,
  34   GTK_RBNODE_IS_PARENT = 1 << 2,
  35   GTK_RBNODE_IS_SELECTED = 1 << 3,
  36   GTK_RBNODE_IS_PRELIT = 1 << 4,
  37   GTK_RBNODE_IS_SEMI_COLLAPSED = 1 << 5,
  38   GTK_RBNODE_IS_SEMI_EXPANDED = 1 << 6,
  39   GTK_RBNODE_INVALID = 1 << 7,
  40   GTK_RBNODE_DESCENDANTS_INVALID = 1 << 8,
  41   GTK_RBNODE_NON_COLORS = GTK_RBNODE_IS_PARENT | GTK_RBNODE_IS_SELECTED | GTK_RBNODE_IS_PRELIT | GTK_RBNODE_IS_SEMI_COLLAPSED | GTK_RBNODE_IS_SEMI_EXPANDED | GTK_RBNODE_INVALID | GTK_RBNODE_DESCENDANTS_INVALID
  42 } GtkRBNodeColor;
  43
  44 typedef struct _GtkRBTree GtkRBTree;
  45 typedef struct _GtkRBNode GtkRBNode;
  46 typedef struct _GtkRBTreeView GtkRBTreeView;
  47
  48 typedef void (*GtkRBTreeTraverseFunc) (GtkRBTree  *tree,
  49                                        GtkRBNode  *node,
  50                                        gpointer  data);
  51
  52 struct _GtkRBTree
  53 {
  54   GtkRBNode *root;
  55   GtkRBNode *nil;
  56   GtkRBTree *parent_tree;
  57   GtkRBNode *parent_node;
  58 };
  59
  60 struct _GtkRBNode
  61 {
  62   guint flags : 14;
  63
  64   /* We keep track of whether the aggregate count of children plus 1
  65    * for the node itself comes to an even number.  The parity flag is
  66    * the total count of children mod 2, where the total count of
  67    * children gets computed in the same way that the total offset gets
  68    * computed. i.e. not the same as the "count" field below which
  69    * doesn't include children. We could replace parity with a
  70    * full-size int field here, and then take % 2 to get the parity flag,
  71    * but that would use extra memory.
  72    */
  73
  74   guint parity : 1;
  75
  76   GtkRBNode *left;
  77   GtkRBNode *right;
  78   GtkRBNode *parent;
  79
  80   /* count is the number of nodes beneath us, plus 1 for ourselves.
  81    * i.e. node->left->count + node->right->count + 1
  82    */
  83   gint count;
  84
  85   /* this is the total of sizes of
  86    * node->left, node->right, our own height, and the height
  87    * of all trees in ->children, iff children exists because
  88    * the thing is expanded.
  89    */
  90   gint offset;
  91
  92   /* Child trees */
  93   GtkRBTree *children;
  94 };
  95
  96 #define GTK_RBNODE_GET_COLOR(node)              (node?(((node->flags&GTK_RBNODE_RED)==GTK_RBNODE_RED)?GTK_RBNODE_RED:GTK_RBNODE_BLACK):GTK_RBNODE_BLACK)
  97 #define GTK_RBNODE_SET_COLOR(node,color)        if((node->flags&color)!=color)node->flags=node->flags^(GTK_RBNODE_RED|GTK_RBNODE_BLACK)
  98 #define GTK_RBNODE_GET_HEIGHT(node)             (node->offset-(node->left->offset+node->right->offset+(node->children?node->children->root->offset:0)))
  99 #define GTK_RBNODE_SET_FLAG(node, flag)         G_STMT_START{ (node->flags|=flag); }G_STMT_END
 100 #define GTK_RBNODE_UNSET_FLAG(node, flag)       G_STMT_START{ (node->flags&=~(flag)); }G_STMT_END
 101 #define GTK_RBNODE_FLAG_SET(node, flag)         (node?(((node->flags&flag)==flag)?TRUE:FALSE):FALSE)
 102
 103
 104 void       _gtk_rbtree_push_allocator   (GAllocator             *allocator);
 105 void       _gtk_rbtree_pop_allocator    (void);
 106 GtkRBTree *_gtk_rbtree_new              (void);
 107 void       _gtk_rbtree_free             (GtkRBTree              *tree);
 108 void       _gtk_rbtree_remove           (GtkRBTree              *tree);
 109 void       _gtk_rbtree_destroy          (GtkRBTree              *tree);
 110 GtkRBNode *_gtk_rbtree_insert_before    (GtkRBTree              *tree,
 111                                          GtkRBNode              *node,
 112                                          gint                    height);
 113 GtkRBNode *_gtk_rbtree_insert_after     (GtkRBTree              *tree,
 114                                          GtkRBNode              *node,
 115                                          gint                    height);
 116 void       _gtk_rbtree_remove_node      (GtkRBTree              *tree,
 117                                          GtkRBNode              *node);
 118 void       _gtk_rbtree_reorder          (GtkRBTree              *tree,
 119                                          gint                   *new_order,
 120                                          gint                    length);
 121 GtkRBNode *_gtk_rbtree_find_count       (GtkRBTree              *tree,
 122                                          gint                    count);
 123 void       _gtk_rbtree_node_set_height  (GtkRBTree              *tree,
 124                                          GtkRBNode              *node,
 125                                          gint                    height);
 126 void       _gtk_rbtree_node_mark_invalid(GtkRBTree              *tree,
 127                                          GtkRBNode              *node);
 128 void       _gtk_rbtree_node_mark_valid  (GtkRBTree              *tree,
 129                                          GtkRBNode              *node);
 130 gint       _gtk_rbtree_node_find_offset (GtkRBTree              *tree,
 131                                          GtkRBNode              *node);
 132 gint       _gtk_rbtree_node_find_parity (GtkRBTree              *tree,
 133                                          GtkRBNode              *node);
 134 gint       _gtk_rbtree_find_offset      (GtkRBTree              *tree,
 135                                          gint                    offset,
 136                                          GtkRBTree             **new_tree,
 137                                          GtkRBNode             **new_node);
 138 void       _gtk_rbtree_traverse         (GtkRBTree              *tree,
 139                                          GtkRBNode              *node,
 140                                          GTraverseType           order,
 141                                          GtkRBTreeTraverseFunc   func,
 142                                          gpointer                data);
 143 GtkRBNode *_gtk_rbtree_next             (GtkRBTree              *tree,
 144                                          GtkRBNode              *node);
 145 GtkRBNode *_gtk_rbtree_prev             (GtkRBTree              *tree,
 146                                          GtkRBNode              *node);
 147 void       _gtk_rbtree_next_full        (GtkRBTree              *tree,
 148                                          GtkRBNode              *node,
 149                                          GtkRBTree             **new_tree,
 150                                          GtkRBNode             **new_node);
 151 void       _gtk_rbtree_prev_full        (GtkRBTree              *tree,
 152                                          GtkRBNode              *node,
 153                                          GtkRBTree             **new_tree,
 154                                          GtkRBNode             **new_node);
 155
 156 gint       _gtk_rbtree_get_depth        (GtkRBTree              *tree);
 157
 158 /* This func just checks the integrity of the tree */
 159 /* It will go away later. */
 160 void       _gtk_rbtree_test             (const gchar            *where,
 161                                          GtkRBTree              *tree);
 162
 163
 164 #ifdef __cplusplus
 165 }
 166 #endif /* __cplusplus */
 167
 168 #endif /* __GTK_RBTREE_H__ */