path: root/widgets/table/e-tree-memory.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 * e-tree-memory.c: a Tree Model implementation that the programmer builds in memory.
 *
 * Author:
 *   Chris Toshok (toshok@ximian.com)
 *   Chris Lahey <clahey@ximian.com>
 *
 * Adapted from the gtree code and ETableModel.
 *
 * (C) 2000, 2001 Ximian, Inc.
 */
#include <config.h>

#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>

#include <gnome-xml/parser.h>
#include <gnome-xml/xmlmemory.h>

#include <gtk/gtksignal.h>
#include <stdlib.h>
#include "gal/util/e-util.h"
#include "gal/util/e-xml-utils.h"
#include "e-tree-memory.h"

#define PARENT_TYPE E_TREE_MODEL_TYPE

#define TREEPATH_CHUNK_AREA_SIZE (30 * sizeof (ETreeMemoryPath))

static ETreeModel *parent_class;
static GMemChunk  *node_chunk;

typedef struct ETreeMemoryPath ETreeMemoryPath;

struct ETreeMemoryPath {
    gpointer         node_data;

    /* parent/child/sibling pointers */
    ETreeMemoryPath *parent;
    ETreeMemoryPath *next_sibling;
    ETreeMemoryPath *prev_sibling;
    ETreeMemoryPath *first_child;
    ETreeMemoryPath *last_child;

    gint             num_children;
};

struct ETreeMemoryPriv {
    ETreeMemoryPath *root;
    gboolean         expanded_default; /* whether nodes are created expanded or collapsed by default */
    gint             frozen;
};


/* ETreeMemoryPath functions */

static int
e_tree_memory_path_depth (ETreeMemoryPath *path)
{
    int depth = 0;

    g_return_val_if_fail(path != NULL, -1);

    for ( path = path->parent; path; path = path->parent)
        depth ++;
    return depth;
}

static void
e_tree_memory_path_insert (ETreeMemoryPath *parent, int position, ETreeMemoryPath *child)
{
    g_return_if_fail (position <= parent->num_children && position >= -1);

    child->parent = parent;

    if (parent->first_child == NULL)
        parent->first_child = child;

    if (position == -1 || position == parent->num_children) {
        child->prev_sibling = parent->last_child;
        if (parent->last_child)
            parent->last_child->next_sibling = child;
        parent->last_child = child;
    } else {
        ETreeMemoryPath *c;
        for (c = parent->first_child; c; c = c->next_sibling) {
            if (position == 0) {
                child->next_sibling = c;
                child->prev_sibling = c->prev_sibling;

                if (child->next_sibling)
                    child->next_sibling->prev_sibling = child;
                if (child->prev_sibling)
                    child->prev_sibling->next_sibling = child;

                if (parent->first_child == c)
                    parent->first_child = child;
                break;
            }
            position --;
        }
    }

    parent->num_children++;
}

static void
e_tree_path_unlink (ETreeMemoryPath *path)
{
    ETreeMemoryPath *parent = path->parent;

    /* unlink first/last child if applicable */
    if (parent) {
        if (path == parent->first_child)
            parent->first_child = path->next_sibling;
        if (path == parent->last_child)
            parent->last_child = path->prev_sibling;

        parent->num_children --;
    }

    /* unlink prev/next sibling links */
    if (path->next_sibling)
        path->next_sibling->prev_sibling = path->prev_sibling;
    if (path->prev_sibling)
        path->prev_sibling->next_sibling = path->next_sibling;

    path->parent = NULL;
    path->next_sibling = NULL;
    path->prev_sibling = NULL;
}



/**
 * e_tree_memory_freeze:
 * @etmm: the ETreeModel to freeze.
 * 
 * This function prepares an ETreeModel for a period of much change.
 * All signals regarding changes to the tree are deferred until we
 * thaw the tree.
 * 
 **/
void
e_tree_memory_freeze(ETreeMemory *etmm)
{
    ETreeMemoryPriv *priv = etmm->priv;

    e_tree_model_pre_change(E_TREE_MODEL(etmm));

    priv->frozen ++;
}

/**
 * e_tree_memory_thaw:
 * @etmm: the ETreeMemory to thaw.
 * 
 * This function thaws an ETreeMemory.  All the defered signals can add
 * up to a lot, we don't know - so we just emit a model_changed
 * signal.
 * 
 **/
void
e_tree_memory_thaw(ETreeMemory *etmm)
{
    ETreeMemoryPriv *priv = etmm->priv;

    if (priv->frozen > 0)
        priv->frozen --;
    if (priv->frozen == 0) {
        e_tree_model_node_changed(E_TREE_MODEL(etmm), priv->root);
    }
}


/* virtual methods */

static void
etmm_destroy (GtkObject *object)
{
    ETreeMemory *etmm = E_TREE_MEMORY (object);
    ETreeMemoryPriv *priv = etmm->priv;

    /* XXX lots of stuff to free here */

    if (priv->root)
        e_tree_memory_node_remove (etmm, priv->root);

    g_free (priv);

    GTK_OBJECT_CLASS (parent_class)->destroy (object);
}

static ETreePath
etmm_get_root (ETreeModel *etm)
{
    ETreeMemoryPriv *priv = E_TREE_MEMORY(etm)->priv;
    return priv->root;
}

static ETreePath
etmm_get_parent (ETreeModel *etm, ETreePath node)
{
    ETreeMemoryPath *path = node;
    return path->parent;
}

static ETreePath
etmm_get_first_child (ETreeModel *etm, ETreePath node)
{
    ETreeMemoryPath *path = node;
    return path->first_child;
}

static ETreePath
etmm_get_last_child (ETreeModel *etm, ETreePath node)
{
    ETreeMemoryPath *path = node;
    return path->last_child;
}

static ETreePath
etmm_get_next (ETreeModel *etm, ETreePath node)
{
    ETreeMemoryPath *path = node;
    return path->next_sibling;
}

static ETreePath
etmm_get_prev (ETreeModel *etm, ETreePath node)
{
    ETreeMemoryPath *path = node;
    return path->prev_sibling;
}

static gboolean
etmm_is_root (ETreeModel *etm, ETreePath node)
{
    ETreeMemoryPath *path = node;
    return e_tree_memory_path_depth (path) == 0;
}

static gboolean
etmm_is_expandable (ETreeModel *etm, ETreePath node)
{
    ETreeMemoryPath *path = node;
    return path->first_child != NULL;
}

static guint
etmm_get_children (ETreeModel *etm, ETreePath node, ETreePath **nodes)
{
    ETreeMemoryPath *path = node;
    guint n_children;

    n_children = path->num_children;

    if (nodes) {
        ETreeMemoryPath *p;
        int i = 0;

        (*nodes) = g_malloc (sizeof (ETreePath) * n_children);
        for (p = path->first_child; p; p = p->next_sibling) {
            (*nodes)[i++] = p;
        }
    }

    return n_children;
}

static guint
etmm_depth (ETreeModel *etm, ETreePath path)
{
    return e_tree_memory_path_depth(path);
}

static gboolean
etmm_get_expanded_default (ETreeModel *etm)
{
    ETreeMemory *etmm = E_TREE_MEMORY (etm);
    ETreeMemoryPriv *priv = etmm->priv;

    return priv->expanded_default;
}


static void
e_tree_memory_class_init (GtkObjectClass *klass)
{
    ETreeModelClass *tree_class = (ETreeModelClass *) klass;

    parent_class                     = gtk_type_class (PARENT_TYPE);
    
    node_chunk                       = g_mem_chunk_create (ETreeMemoryPath, TREEPATH_CHUNK_AREA_SIZE, G_ALLOC_AND_FREE);

    klass->destroy                   = etmm_destroy;

    tree_class->get_root             = etmm_get_root;
    tree_class->get_prev             = etmm_get_prev;
    tree_class->get_next             = etmm_get_next;
    tree_class->get_first_child      = etmm_get_first_child;
    tree_class->get_last_child       = etmm_get_last_child;
    tree_class->get_parent           = etmm_get_parent;

    tree_class->is_root              = etmm_is_root;
    tree_class->is_expandable        = etmm_is_expandable;
    tree_class->get_children         = etmm_get_children;
    tree_class->depth                = etmm_depth;
    tree_class->get_expanded_default = etmm_get_expanded_default;
}

static void
e_tree_memory_init (GtkObject *object)
{
    ETreeMemory *etmm = (ETreeMemory *)object;

    ETreeMemoryPriv *priv;

    priv = g_new0 (ETreeMemoryPriv, 1);
    etmm->priv = priv;

    priv->root = NULL;
    priv->frozen = 0;
    priv->expanded_default = 0;
}

E_MAKE_TYPE(e_tree_memory, "ETreeMemory", ETreeMemory, e_tree_memory_class_init, e_tree_memory_init, PARENT_TYPE)



/**
 * e_tree_memory_construct:
 * @etree: 
 * 
 * 
 **/
void
e_tree_memory_construct (ETreeMemory *etmm)
{
}

/**
 * e_tree_memory_new
 *
 * XXX docs here.
 *
 * return values: a newly constructed ETreeMemory.
 */
ETreeMemory *
e_tree_memory_new (void)
{
    ETreeMemory *etmm;

    etmm = gtk_type_new (e_tree_memory_get_type ());

    e_tree_memory_construct(etmm);

    return etmm;
}

void
e_tree_memory_set_expanded_default         (ETreeMemory *etree, gboolean expanded)
{
    etree->priv->expanded_default = expanded;
}

/**
 * e_tree_memory_node_get_data:
 * @etmm: 
 * @node: 
 * 
 * 
 * 
 * Return value: 
 **/
gpointer
e_tree_memory_node_get_data (ETreeMemory *etmm, ETreePath node)
{
    ETreeMemoryPath *path = node;

    g_return_val_if_fail (path, NULL);

    return path->node_data;
}

/**
 * e_tree_memory_node_set_data:
 * @etmm: 
 * @node: 
 * @node_data: 
 * 
 * 
 **/
void
e_tree_memory_node_set_data (ETreeMemory *etmm, ETreePath node, gpointer node_data)
{
    ETreeMemoryPath *path = node;

    g_return_if_fail (path);

    path->node_data = node_data;
}

/**
 * e_tree_memory_node_insert:
 * @tree_model: 
 * @parent_path: 
 * @position: 
 * @node_data: 
 * 
 * 
 * 
 * Return value: 
 **/
ETreePath
e_tree_memory_node_insert (ETreeMemory *tree_model,
               ETreePath parent_node,
               int position,
               gpointer node_data)
{
    ETreeMemoryPriv *priv;
    ETreeMemoryPath *new_path;
    ETreeMemoryPath *parent_path = parent_node;

    g_return_val_if_fail(tree_model != NULL, NULL);

    priv = tree_model->priv;

    g_return_val_if_fail (parent_path != NULL || priv->root == NULL, NULL);

    priv = tree_model->priv;

    if (!tree_model->priv->frozen)
        e_tree_model_pre_change(E_TREE_MODEL(tree_model));

    new_path = g_chunk_new0 (ETreeMemoryPath, node_chunk);

    new_path->node_data = node_data;

    if (parent_path != NULL) {
        e_tree_memory_path_insert (parent_path, position, new_path);
        if (!tree_model->priv->frozen)
            e_tree_model_node_inserted (E_TREE_MODEL(tree_model), parent_path, new_path);
    }
    else {
        priv->root = new_path;
        if (!tree_model->priv->frozen)
            e_tree_model_node_changed(E_TREE_MODEL(tree_model), new_path);
    }

    return new_path;
}

ETreePath e_tree_memory_node_insert_id     (ETreeMemory *etree, ETreePath parent, int position, gpointer node_data, char *id)
{
    return e_tree_memory_node_insert(etree, parent, position, node_data);
}

/**
 * e_tree_memory_node_insert_before:
 * @etree: 
 * @parent: 
 * @sibling: 
 * @node_data: 
 * 
 * 
 * 
 * Return value: 
 **/
ETreePath
e_tree_memory_node_insert_before (ETreeMemory *etree,
                  ETreePath parent,
                  ETreePath sibling,
                  gpointer node_data)
{
    ETreeMemoryPath *child;
    ETreeMemoryPath *parent_path = parent;
    ETreeMemoryPath *sibling_path = sibling;
    int position = 0;

    g_return_val_if_fail(etree != NULL, NULL);

    if (sibling != NULL) {
        for (child = parent_path->first_child; child; child = child->next_sibling) {
            if (child == sibling_path)
                break;
            position ++;
        }
    } else
        position = parent_path->num_children;
    return e_tree_memory_node_insert (etree, parent, position, node_data);
}

/* just blows away child data, doesn't take into account unlinking/etc */
static void
child_free(ETreeMemory *etree, ETreeMemoryPath *node)
{
    ETreeMemoryPath *child, *next;

    child = node->first_child;
    while (child) {
        next = child->next_sibling;
        child_free(etree, child);
        child = next;
    }

    g_chunk_free(node, node_chunk);
}

/**
 * e_tree_memory_node_remove:
 * @etree: 
 * @path: 
 * 
 * 
 * 
 * Return value: 
 **/
gpointer
e_tree_memory_node_remove (ETreeMemory *etree, ETreePath node)
{
    ETreeMemoryPath *path = node;
    ETreeMemoryPath *parent = path->parent;
    gpointer ret = path->node_data;

    g_return_val_if_fail(etree != NULL, NULL);

    if (!etree->priv->frozen)
        e_tree_model_pre_change(E_TREE_MODEL(etree));

    /* unlink this node - we only have to unlink the root node being removed,
       since the others are only references from this node */
    e_tree_path_unlink (path);

    /*printf("removing %d nodes from position %d\n", visible, base);*/
    if (!etree->priv->frozen)
        e_tree_model_node_removed(E_TREE_MODEL(etree), parent, path);

    child_free(etree, path);

    if (path == etree->priv->root)
        etree->priv->root = NULL;

    return ret;
}

typedef struct {
    ETreeMemory *memory;
    gpointer closure;
    ETreeMemorySortCallback callback;
} MemoryAndClosure;

static int
sort_callback(const void *data1, const void *data2, gpointer user_data)
{
    ETreePath path1 = *(ETreePath *)data1;
    ETreePath path2 = *(ETreePath *)data2;
    MemoryAndClosure *mac = user_data;
    return (*mac->callback) (mac->memory, path1, path2, mac->closure);
}

void
e_tree_memory_sort_node             (ETreeMemory             *etmm,
                     ETreePath                node,
                     ETreeMemorySortCallback  callback,
                     gpointer                 user_data)
{
    ETreeMemoryPath **children;
    ETreeMemoryPath *child;
    int count;
    int i;
    ETreeMemoryPath *path = node;
    MemoryAndClosure mac;
    ETreeMemoryPath *last;
    
    i = 0;
    for (child = path->first_child; child; child = child->next_sibling)
        i++;

    children = g_new(ETreeMemoryPath *, i);

    count = i;

    for (child = path->first_child, i = 0;
         child;
         child = child->next_sibling, i++) {
        children[i] = child;
    }

    mac.memory = etmm;
    mac.closure = user_data;
    mac.callback = callback;

    e_sort (children, count, sizeof (ETreeMemoryPath *), sort_callback, &mac);

    path->first_child = NULL;
    last = NULL;
    for (i = 0;
         i < count;
         i++) {
        children[i]->prev_sibling = last;
        if (last)
            last->next_sibling = children[i];
        else
            path->first_child = children[i];
        last = children[i];
    }
    if (last)
        last->next_sibling = NULL;

    path->last_child = last;

    g_free(children);

    e_tree_model_node_changed(E_TREE_MODEL(etmm), node);
}