path: root/widgets/table/e-tree-selection-model.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 * e-tree-selection-model.c: a Selection Model
 *
 * Author:
 *   Christopher James Lahey <clahey@ximian.com>
 *
 * (C) 2000, 2001 Ximian, Inc.
 */
#include <config.h>
#include <gtk/gtksignal.h>
#include "e-tree-selection-model.h"
#include <gal/util/e-bit-array.h>
#include <gal/util/e-sorter.h>
#include <gal/util/e-util.h>
#include <gdk/gdkkeysyms.h>
#include <gal/e-table/e-tree-sorted.h>
#include <gal/e-table/e-tree-table-adapter.h>

#define ETSM_CLASS(e) ((ETreeSelectionModelClass *)((GtkObject *)e)->klass)

#define PARENT_TYPE e_selection_model_get_type ()

static ESelectionModelClass *parent_class;

enum {
    ARG_0,
    ARG_CURSOR_ROW,
    ARG_CURSOR_COL,
    ARG_MODEL,
    ARG_ETTA,
    ARG_ETS,
};

typedef struct ETreeSelectionModelNode {
    guint selected : 1;
    guint all_children_selected : 1;
    guint any_children_selected : 1;
    EBitArray *all_children_selected_array;
    EBitArray *any_children_selected_array;
    struct ETreeSelectionModelNode **children;
    int num_children;
} ETreeSelectionModelNode;

struct ETreeSelectionModelPriv {
    ETreeTableAdapter *etta;
    ETreeSorted *ets;
    ETreeModel *model;

    ETreeSelectionModelNode *root;

    ETreePath cursor_path;
    gint cursor_col;
    gint selection_start_row;

    guint model_changed_id;
    guint model_row_inserted_id, model_row_deleted_id;

    guint frozen : 1;
    guint selection_model_changed : 1;
    guint group_info_changed : 1;

    int          tree_model_pre_change_id;
    int          tree_model_node_changed_id;
    int          tree_model_node_data_changed_id;
    int          tree_model_node_col_changed_id;
    int          tree_model_node_inserted_id;
    int          tree_model_node_removed_id;
};

/* ETreeSelectionModelNode helpers */

static ETreeSelectionModelNode *
e_tree_selection_model_node_new (void)
{
    ETreeSelectionModelNode *node = g_new(ETreeSelectionModelNode, 1);

    node->selected = 0;
    node->all_children_selected = 0;
    node->any_children_selected = 0;
    node->all_children_selected_array = NULL;
    node->any_children_selected_array = NULL;
    node->children = NULL;
    node->num_children = -1;

    return node;
}

static void
e_tree_selection_model_node_fill_children(ETreeSelectionModel *etsm, ETreePath path, ETreeSelectionModelNode *selection_node)
{
    int i;
    selection_node->num_children = e_tree_sorted_node_num_children(etsm->priv->ets, path);
    selection_node->children = g_new(ETreeSelectionModelNode *, selection_node->num_children);
    for (i = 0; i < selection_node->num_children; i++) {
        selection_node->children[i] = NULL;
    }
}

static void
e_tree_selection_model_node_free(ETreeSelectionModelNode *node)
{
    int i;

    if (node->all_children_selected_array)
        gtk_object_unref(GTK_OBJECT(node->all_children_selected_array));
    if (node->any_children_selected_array)
        gtk_object_unref(GTK_OBJECT(node->any_children_selected_array));

    for (i = 0; i < node->num_children; i++)
        if (node->children[i])
            e_tree_selection_model_node_free(node->children[i]);
    g_free(node->children);

    g_free(node);
}


/* Other helper functions */
static ETreePath
etsm_node_at_row(ETreeSelectionModel *etsm, int row)
{
    ETreePath path;

    path = e_tree_table_adapter_node_at_row(etsm->priv->etta, row);

    if (path)
        path = e_tree_sorted_view_to_model_path(etsm->priv->ets, path);
 
    return path;
}

static int
etsm_row_of_node(ETreeSelectionModel *etsm, ETreePath path)
{
    path = e_tree_sorted_model_to_view_path(etsm->priv->ets, path);

    if (path)
        return e_tree_table_adapter_row_of_node(etsm->priv->etta, path);
    else
        return 0;
}

static int
etsm_cursor_row_real (ETreeSelectionModel *etsm)
{
    if (etsm->priv->cursor_path)
        return etsm_row_of_node(etsm, etsm->priv->cursor_path);
    else
        return -1;
}

static void
etsm_real_clear (ETreeSelectionModel *etsm)
{
    if (etsm->priv->root) {
        e_tree_selection_model_node_free(etsm->priv->root);
        etsm->priv->root = NULL;
    }
}

static ETreeSelectionModelNode *
etsm_find_node_unless_equals (ETreeSelectionModel *etsm,
                 ETreePath path,
                 gboolean grow)
{
    ETreeSelectionModelNode *selection_node;
    ETreeSorted *ets = etsm->priv->ets;
    ETreePath parent;

    parent = e_tree_model_node_get_parent(E_TREE_MODEL(ets), path);

    if (parent) {
        selection_node = etsm_find_node_unless_equals(etsm, parent, grow);
        if (selection_node) {
            int position = e_tree_sorted_orig_position(ets, path);
            if (selection_node->all_children_selected && grow)
                return NULL;
            if (!(selection_node->any_children_selected || grow))
                return NULL;
            if (selection_node->all_children_selected_array && e_bit_array_value_at(selection_node->all_children_selected_array, position) && grow)
                return NULL;
            if (selection_node->any_children_selected_array && ! (e_bit_array_value_at(selection_node->any_children_selected_array, position) || grow))
                return NULL;
            if (selection_node->children == NULL) {
                e_tree_selection_model_node_fill_children(etsm, parent, selection_node);
            }
            if (!selection_node->children[position]) 
                selection_node->children[position] = e_tree_selection_model_node_new();

            return selection_node->children[position];
        } else
              return NULL;
    } else {
        if (!etsm->priv->root)
            etsm->priv->root = e_tree_selection_model_node_new();
        return etsm->priv->root;
    }
}

#if 0
static ETreeSelectionModelNode *
find_or_create_node (ETreeSelectionModel *etsm,
             ETreePath path)
{
    ETreeSelectionModelNode *selection_node;
    ETreeSelectionModelNode **place = NULL;
    ETreeSorted *ets = etsm->priv->ets;
    ETreePath parent;

    parent = e_tree_model_node_get_parent(E_TREE_MODEL(ets), path);

    if (parent) {
        selection_node = find_or_create_node(etsm, parent);
        if (selection_node) {
            int position = e_tree_sorted_orig_position(ets, path);
            if (!selection_node->children) {
                e_tree_selection_model_node_fill_children(etsm, parent, selection_node);
            }
            if (!selection_node->children[position]) 
                slection_node->children[position] = e_tree_selection_model_node_new();

            return selection_node->children[position];
        } else
              return NULL;
    } else {
        if (!etsm->priv->root)
            etsm->priv->root = e_tree_selection_model_node_new();
        return etsm->priv->root;
    }
}
#endif

static void
update_parents (ETreeSelectionModel *etsm, ETreePath path)
{
    int i;
    int depth;
    ETreeSorted *ets = etsm->priv->ets;
    int *orig_position_sequence;
    ETreeSelectionModelNode **node_sequence;
    ETreePath parents;

    if (!etsm->priv->root)
        return;

    depth = e_tree_model_node_depth (E_TREE_MODEL(ets), path);

    orig_position_sequence = g_new(int, depth + 1);
    node_sequence = g_new(ETreeSelectionModelNode *, depth + 1);

    parents = path;

    for (i = depth; i > 0; i--) {
        if (!parents) {
            g_free(orig_position_sequence);
            g_free(node_sequence);
            return;
        }
        orig_position_sequence[i] = e_tree_sorted_orig_position(etsm->priv->ets, parents);
        parents = e_tree_model_node_get_parent(E_TREE_MODEL(etsm->priv->ets), parents);
    }

    node_sequence[0] = etsm->priv->root;
    for (i = 0; i < depth; i++) {
        node_sequence[i + 1] = NULL;

        if (node_sequence[i]->children)
            node_sequence[i + 1] = node_sequence[i]->children[orig_position_sequence[i + 1]];

        if (node_sequence[i + 1] == NULL) {
            g_free(orig_position_sequence);
            g_free(node_sequence);
            return;
        }
    }

    if (node_sequence[depth]->num_children == -1)
        e_tree_selection_model_node_fill_children(etsm, path, node_sequence[depth]);

    if (!node_sequence[depth]->all_children_selected_array)
        node_sequence[depth]->all_children_selected_array = e_bit_array_new(node_sequence[depth]->num_children);
    if (!node_sequence[depth]->any_children_selected_array)
        node_sequence[depth]->any_children_selected_array = e_bit_array_new(node_sequence[depth]->num_children);

    node_sequence[depth]->all_children_selected =
        e_bit_array_cross_and(node_sequence[depth]->all_children_selected_array) &&
        node_sequence[depth]->selected;

    node_sequence[depth]->any_children_selected =
        e_bit_array_cross_or(node_sequence[depth]->any_children_selected_array) ||
        node_sequence[depth]->selected;

    for (i = depth - 1; i >= 0; i--) {
        gboolean all_children, any_children;

        if (!node_sequence[i]->all_children_selected_array)
            node_sequence[i]->all_children_selected_array = e_bit_array_new(node_sequence[i]->num_children);
        if (!node_sequence[i]->any_children_selected_array)
            node_sequence[i]->any_children_selected_array = e_bit_array_new(node_sequence[i]->num_children);

        e_bit_array_change_one_row(node_sequence[i]->all_children_selected_array,
                       orig_position_sequence[i + 1], node_sequence[i + 1]->all_children_selected);
        e_bit_array_change_one_row(node_sequence[i]->any_children_selected_array,
                       orig_position_sequence[i + 1], node_sequence[i + 1]->any_children_selected);

        all_children = node_sequence[i]->all_children_selected;
        any_children = node_sequence[i]->any_children_selected;

        node_sequence[i]->all_children_selected =
            e_bit_array_cross_and(node_sequence[i]->all_children_selected_array) &&
            node_sequence[i]->selected;
        node_sequence[i]->any_children_selected =
            e_bit_array_cross_or(node_sequence[i]->any_children_selected_array) ||
            node_sequence[i]->selected;

        if (all_children == node_sequence[i]->all_children_selected &&
            any_children == node_sequence[i]->any_children_selected)
            break;
    }

    g_free(orig_position_sequence);
    g_free(node_sequence);
}


/* Signal handlers */

static void
etsm_pre_change (ETreeModel *etm, ETreeSelectionModel *etsm)
{
}

static void
etsm_node_changed (ETreeModel *etm, ETreePath node, ETreeSelectionModel *etsm)
{
    etsm_real_clear (etsm);
}

static void
etsm_node_data_changed (ETreeModel *etm, ETreePath node, ETreeSelectionModel *etsm)
{
}

static void
etsm_node_col_changed (ETreeModel *etm, ETreePath node, int col, ETreeSelectionModel *etsm)
{
}

static void
etsm_node_inserted (ETreeModel *etm, ETreePath parent, ETreePath child, ETreeSelectionModel *etsm)
{
    etsm_node_changed(etm, parent, etsm);
#if 0
    ETreeSelectionModelNode *node;
    ETreePath path;

    path = e_tree_sorted_model_to_view_path(etsm->priv->ets, parent);

    if (!path)
        return;

    node = etsm_find_node_unless_equals (etsm, path, FALSE);

    if (node) {
        node->selected = FALSE;
        update_parents(etsm, path);
    }
#endif
}

static void
etsm_node_removed (ETreeModel *etm, ETreePath parent, ETreePath child, int old_position, ETreeSelectionModel *etsm)
{
    etsm_node_changed(etm, parent, etsm);
}


static void
add_model(ETreeSelectionModel *etsm, ETreeModel *model)
{
    ETreeSelectionModelPriv *priv = etsm->priv;
    priv->model = model;

    if (!priv->model)
        return;

    gtk_object_ref(GTK_OBJECT(priv->model));
    priv->tree_model_pre_change_id        = gtk_signal_connect (GTK_OBJECT (priv->model), "pre_change",
                                    GTK_SIGNAL_FUNC (etsm_pre_change), etsm);
    priv->tree_model_node_changed_id      = gtk_signal_connect (GTK_OBJECT (priv->model), "node_changed",
                                    GTK_SIGNAL_FUNC (etsm_node_changed), etsm);
    priv->tree_model_node_data_changed_id = gtk_signal_connect (GTK_OBJECT (priv->model), "node_data_changed",
                                    GTK_SIGNAL_FUNC (etsm_node_data_changed), etsm);
    priv->tree_model_node_col_changed_id  = gtk_signal_connect (GTK_OBJECT (priv->model), "node_col_changed",
                                    GTK_SIGNAL_FUNC (etsm_node_col_changed), etsm);
    priv->tree_model_node_inserted_id     = gtk_signal_connect (GTK_OBJECT (priv->model), "node_inserted",
                                    GTK_SIGNAL_FUNC (etsm_node_inserted), etsm);
    priv->tree_model_node_removed_id      = gtk_signal_connect (GTK_OBJECT (priv->model), "node_removed",
                                    GTK_SIGNAL_FUNC (etsm_node_removed), etsm);
}

static void
drop_model(ETreeSelectionModel *etsm)
{
    ETreeSelectionModelPriv *priv = etsm->priv;

    if (!priv->model)
        return;

    gtk_signal_disconnect (GTK_OBJECT (priv->model),
                   priv->tree_model_pre_change_id);
    gtk_signal_disconnect (GTK_OBJECT (priv->model),
                   priv->tree_model_node_changed_id);
    gtk_signal_disconnect (GTK_OBJECT (priv->model),
                   priv->tree_model_node_data_changed_id);
    gtk_signal_disconnect (GTK_OBJECT (priv->model),
                   priv->tree_model_node_col_changed_id);
    gtk_signal_disconnect (GTK_OBJECT (priv->model),
                   priv->tree_model_node_inserted_id);
    gtk_signal_disconnect (GTK_OBJECT (priv->model),
                   priv->tree_model_node_removed_id);

    gtk_object_unref (GTK_OBJECT (priv->model));
    priv->model = NULL;

    priv->tree_model_pre_change_id = 0;
    priv->tree_model_node_changed_id = 0;
    priv->tree_model_node_data_changed_id = 0;
    priv->tree_model_node_col_changed_id = 0;
    priv->tree_model_node_inserted_id = 0;
    priv->tree_model_node_removed_id = 0;
}

/* Virtual functions */
static void
etsm_destroy (GtkObject *object)
{
    ETreeSelectionModel *etsm;

    etsm = E_TREE_SELECTION_MODEL (object);

    etsm_real_clear (etsm);
    drop_model(etsm);
    g_free(etsm->priv);
}

static void
etsm_get_arg (GtkObject *o, GtkArg *arg, guint arg_id)
{
    ETreeSelectionModel *etsm = E_TREE_SELECTION_MODEL (o);

    switch (arg_id){
    case ARG_CURSOR_ROW:
        GTK_VALUE_INT(*arg) = etsm_cursor_row_real(etsm);
        break;

    case ARG_CURSOR_COL:
        GTK_VALUE_INT(*arg) = etsm->priv->cursor_col;
        break;

    case ARG_MODEL:
        GTK_VALUE_OBJECT(*arg) = (GtkObject *) etsm->priv->model;
        break;

    case ARG_ETTA:
        GTK_VALUE_OBJECT(*arg) = (GtkObject *) etsm->priv->etta;
        break;

    case ARG_ETS:
        GTK_VALUE_OBJECT(*arg) = (GtkObject *) etsm->priv->ets;
        break;
    }
}

static void
etsm_set_arg (GtkObject *o, GtkArg *arg, guint arg_id)
{
    ESelectionModel *esm = E_SELECTION_MODEL (o);
    ETreeSelectionModel *etsm = E_TREE_SELECTION_MODEL (o);

    switch (arg_id){
    case ARG_CURSOR_ROW:
        e_selection_model_do_something(esm, GTK_VALUE_INT(*arg), etsm->priv->cursor_col, 0);
        break;

    case ARG_CURSOR_COL:
        e_selection_model_do_something(esm, etsm_cursor_row_real(etsm), GTK_VALUE_INT(*arg), 0);
        break;

    case ARG_MODEL:
        drop_model(etsm);
        add_model(etsm, (ETreeModel *) GTK_VALUE_OBJECT(*arg));
        break;

    case ARG_ETTA:
        etsm->priv->etta = (ETreeTableAdapter *) GTK_VALUE_OBJECT(*arg);
        break;

    case ARG_ETS:
        etsm->priv->ets = (ETreeSorted *) GTK_VALUE_OBJECT(*arg);
        break;
    }
}

static ETreeSelectionModelNode *
etsm_recurse_is_path_selected (ESelectionModel *selection,
                   ETreePath path,
                   gboolean *is_selected)
{
    ETreeSelectionModelNode *selection_node;
    ETreeSelectionModel *etsm = E_TREE_SELECTION_MODEL(selection);
    ETreeSorted *ets = etsm->priv->ets;
    ETreePath parent;

    parent = e_tree_model_node_get_parent(E_TREE_MODEL(ets), path);

    if (parent) {
        selection_node = etsm_recurse_is_path_selected (selection, parent, is_selected);
        if (selection_node) {
            int position = e_tree_sorted_orig_position(ets, path);
            if (position < 0 || position >= selection_node->num_children) {
                *is_selected = FALSE;
                return NULL;
            }
            if (selection_node->all_children_selected) {
                *is_selected = TRUE;
                return NULL;
            }
            if (! selection_node->any_children_selected) {
                *is_selected = FALSE;
                return NULL;
            }
            if (selection_node->all_children_selected_array && e_bit_array_value_at(selection_node->all_children_selected_array, position)) {
                *is_selected = TRUE;
                return NULL;
            }
            if (selection_node->any_children_selected_array && ! e_bit_array_value_at(selection_node->any_children_selected_array, position)) {
                *is_selected = FALSE;
                return NULL;
            }
            if (!selection_node->children) {
                *is_selected = FALSE;
                return NULL;
            }
            return selection_node->children[position];
        } else
              return NULL;
    } else {
        if (etsm->priv->root) {
            return etsm->priv->root;
        } else {
            *is_selected = FALSE;
            return NULL;
        }
    }
}

/** 
 * e_selection_model_is_row_selected
 * @selection: #ESelectionModel to check
 * @n: The row to check
 *
 * This routine calculates whether the given row is selected.
 *
 * Returns: %TRUE if the given row is selected
 */
static gboolean
etsm_is_row_selected (ESelectionModel *selection,
              gint             row)
{
    ETreeSelectionModel *etsm = E_TREE_SELECTION_MODEL(selection);
    ETreePath path;
    ETreeSelectionModelNode *selection_node;

    gboolean ret_val;

    path = e_tree_table_adapter_node_at_row(etsm->priv->etta, row);

    selection_node = etsm_recurse_is_path_selected (selection, path, &ret_val);

    if (selection_node)
        ret_val = selection_node->selected;

    return ret_val;
}


typedef struct {
    ETreeSelectionModel *etsm;
    EForeachFunc callback;
    gpointer closure;
} ModelAndCallback;

static void
etsm_row_foreach_cb (ETreePath path, gpointer user_data)
{
    ModelAndCallback *mac = user_data;
    int row = etsm_row_of_node(mac->etsm, path);
    mac->callback(row, mac->closure);
}

/** 
 * e_selection_model_foreach
 * @selection: #ESelectionModel to traverse
 * @callback: The callback function to call back.
 * @closure: The closure
 *
 * This routine calls the given callback function once for each
 * selected row, passing closure as the closure.
 */
static void 
etsm_foreach (ESelectionModel *selection,
          EForeachFunc     callback,
          gpointer         closure)
{
    ETreeSelectionModel *etsm = E_TREE_SELECTION_MODEL(selection);
    ModelAndCallback mac;

    mac.etsm = etsm;
    mac.callback = callback;
    mac.closure = closure;

    e_tree_selection_model_foreach(etsm, etsm_row_foreach_cb, &mac);
}

/** 
 * e_selection_model_clear
 * @selection: #ESelectionModel to clear
 *
 * This routine clears the selection to no rows selected.
 */
static void
etsm_clear(ESelectionModel *selection)
{
    ETreeSelectionModel *etsm = E_TREE_SELECTION_MODEL(selection);

    etsm_real_clear (etsm);

    etsm->priv->cursor_path = NULL;
    etsm->priv->cursor_col = -1;
    e_selection_model_selection_changed(E_SELECTION_MODEL(etsm));
    e_selection_model_cursor_changed(E_SELECTION_MODEL(etsm), -1, -1);
}

#if 0
/** 
 * e_selection_model_selected_count
 * @selection: #ESelectionModel to count
 *
 * This routine calculates the number of rows selected.
 *
 * Returns: The number of rows selected in the given model.
 */
static gint
etsm_selected_count (ESelectionModel *selection)
{
    ETreeSelectionModel *etsm = E_TREE_SELECTION_MODEL(selection);

    return g_hash_table_size(etsm->priv->data);
}
#endif

/** 
 * e_selection_model_select_all
 * @selection: #ESelectionModel to select all
 *
 * This routine selects all the rows in the given
 * #ESelectionModel.
 */
static void
etsm_select_all (ESelectionModel *selection)
{
    ETreeSelectionModel *etsm = E_TREE_SELECTION_MODEL(selection);

    etsm_real_clear (etsm);

    etsm->priv->root = e_tree_selection_model_node_new();
    etsm->priv->root->selected = TRUE;
    etsm->priv->root->all_children_selected = TRUE;
    etsm->priv->root->any_children_selected = TRUE;

    e_tree_selection_model_node_fill_children(etsm, e_tree_model_get_root(E_TREE_MODEL(etsm->priv->ets)), etsm->priv->root);
    etsm->priv->root->all_children_selected_array = e_bit_array_new(etsm->priv->root->num_children);
    etsm->priv->root->any_children_selected_array = e_bit_array_new(etsm->priv->root->num_children);
    e_bit_array_select_all(etsm->priv->root->all_children_selected_array);
    e_bit_array_select_all(etsm->priv->root->any_children_selected_array);

    if (etsm->priv->cursor_col == -1)
        etsm->priv->cursor_col = 0;
    if (etsm->priv->cursor_path == NULL)
        etsm->priv->cursor_path = etsm_node_at_row(etsm, 0);
    etsm->priv->selection_start_row = 0;
    e_selection_model_selection_changed(E_SELECTION_MODEL(etsm));
    e_selection_model_cursor_changed(E_SELECTION_MODEL(etsm), etsm_cursor_row_real(etsm), etsm->priv->cursor_col);
}

static void
etsm_invert_selection_recurse (ETreeSelectionModel *etsm,
                   ETreeSelectionModelNode *selection_node)
{
    gboolean temp;
    EBitArray *temp_eba;
    selection_node->selected = ! selection_node->selected;

    temp = selection_node->all_children_selected;
    selection_node->all_children_selected = ! selection_node->any_children_selected;
    selection_node->any_children_selected = ! temp;

    temp_eba = selection_node->all_children_selected_array;
    selection_node->all_children_selected_array = selection_node->any_children_selected_array;
    selection_node->any_children_selected_array = temp_eba;
    if (selection_node->all_children_selected_array)
        e_bit_array_invert_selection(selection_node->all_children_selected_array);
    if (selection_node->any_children_selected_array)
        e_bit_array_invert_selection(selection_node->any_children_selected_array);
    if (selection_node->children) {
        int i;
        for (i = 0; i < selection_node->num_children; i++) {
            if (selection_node->children[i])
                etsm_invert_selection_recurse (etsm, selection_node->children[i]);
        }
    }
}

/** 
 * e_selection_model_invert_selection
 * @selection: #ESelectionModel to invert
 *
 * This routine inverts all the rows in the given
 * #ESelectionModel.
 */
static void
etsm_invert_selection (ESelectionModel *selection)
{
    ETreeSelectionModel *etsm = E_TREE_SELECTION_MODEL(selection);

    if (etsm->priv->root)
        etsm_invert_selection_recurse (etsm, etsm->priv->root);
    
    etsm->priv->cursor_col = -1;
    etsm->priv->cursor_path = NULL;
    etsm->priv->selection_start_row = 0;
    e_selection_model_selection_changed(E_SELECTION_MODEL(etsm));
    e_selection_model_cursor_changed(E_SELECTION_MODEL(etsm), -1, -1);
}

static int
etsm_row_count (ESelectionModel *selection)
{
    ETreeSelectionModel *etsm = E_TREE_SELECTION_MODEL(selection);
    return e_table_model_row_count(E_TABLE_MODEL(etsm->priv->etta));
}

static void
etsm_change_one_row(ESelectionModel *selection, int row, gboolean grow)
{
    ETreeSelectionModel *etsm = E_TREE_SELECTION_MODEL(selection);
    ETreeSelectionModelNode *node;
    ETreePath path = e_tree_table_adapter_node_at_row(etsm->priv->etta, row);

    if (!path)
        return;

    node = etsm_find_node_unless_equals (etsm, path, grow);

    if (node) {
        node->selected = grow;
        update_parents(etsm, path);
    }
}

static void
etsm_change_cursor (ESelectionModel *selection, int row, int col)
{
    ETreeSelectionModel *etsm;

    g_return_if_fail(selection != NULL);
    g_return_if_fail(E_IS_SELECTION_MODEL(selection));

    etsm = E_TREE_SELECTION_MODEL(selection);

    if (row == -1) {
        etsm->priv->cursor_path = NULL;
    } else {
        etsm->priv->cursor_path = etsm_node_at_row(etsm, row);
    }
    etsm->priv->cursor_col = col;
}

static void
etsm_change_range(ESelectionModel *selection, int start, int end, gboolean grow)
{
    int i;
    if (start != end) {
        if (selection->sorter && e_sorter_needs_sorting(selection->sorter)) {
            for ( i = start; i < end; i++) {
                e_selection_model_change_one_row(selection, e_sorter_sorted_to_model(selection->sorter, i), grow);
            }
        } else {
            for ( i = start; i < end; i++) {
                e_selection_model_change_one_row(selection, i, grow);
            }
        }
    }
}

static int
etsm_cursor_row (ESelectionModel *selection)
{
    return etsm_cursor_row_real(E_TREE_SELECTION_MODEL(selection));
}

static int
etsm_cursor_col (ESelectionModel *selection)
{
    ETreeSelectionModel *etsm = E_TREE_SELECTION_MODEL(selection);
    return etsm->priv->cursor_col;
}

static void
etsm_select_single_row (ESelectionModel *selection, int row)
{
    ETreeSelectionModel *etsm = E_TREE_SELECTION_MODEL(selection);

    etsm_real_clear (etsm);
    etsm_change_one_row(selection, row, TRUE);
    etsm->priv->selection_start_row = row;

    e_selection_model_selection_changed(E_SELECTION_MODEL(etsm));
}

static void
etsm_toggle_single_row (ESelectionModel *selection, int row)
{
    ETreeSelectionModel *etsm = E_TREE_SELECTION_MODEL(selection);

    etsm->priv->selection_start_row = row;

    etsm_change_one_row(selection, row, !etsm_is_row_selected(selection, row));

    e_selection_model_selection_changed(E_SELECTION_MODEL(etsm));
}

static void
etsm_move_selection_end (ESelectionModel *selection, int row)
{
    ETreeSelectionModel *etsm = E_TREE_SELECTION_MODEL(selection);
    int old_start;
    int old_end;
    int new_start;
    int new_end;
    if (selection->sorter && e_sorter_needs_sorting(selection->sorter)) {
        old_start = MIN (e_sorter_model_to_sorted(selection->sorter, etsm->priv->selection_start_row),
                 e_sorter_model_to_sorted(selection->sorter, etsm_cursor_row_real(etsm)));
        old_end = MAX (e_sorter_model_to_sorted(selection->sorter, etsm->priv->selection_start_row),
                   e_sorter_model_to_sorted(selection->sorter, etsm_cursor_row_real(etsm))) + 1;
        new_start = MIN (e_sorter_model_to_sorted(selection->sorter, etsm->priv->selection_start_row),
                 e_sorter_model_to_sorted(selection->sorter, row));
        new_end = MAX (e_sorter_model_to_sorted(selection->sorter, etsm->priv->selection_start_row),
                   e_sorter_model_to_sorted(selection->sorter, row)) + 1;
    } else {
        old_start = MIN (etsm->priv->selection_start_row, etsm_cursor_row_real(etsm));
        old_end = MAX (etsm->priv->selection_start_row, etsm_cursor_row_real(etsm)) + 1;
        new_start = MIN (etsm->priv->selection_start_row, row);
        new_end = MAX (etsm->priv->selection_start_row, row) + 1;
    }
    /* This wouldn't work nearly so smoothly if one end of the selection weren't held in place. */
    if (old_start < new_start)
        etsm_change_range(selection, old_start, new_start, FALSE);
    if (new_start < old_start)
        etsm_change_range(selection, new_start, old_start, TRUE);
    if (old_end < new_end)
        etsm_change_range(selection, old_end, new_end, TRUE);
    if (new_end < old_end)
        etsm_change_range(selection, new_end, old_end, FALSE);
    e_selection_model_selection_changed(E_SELECTION_MODEL(etsm));
}

static void
etsm_set_selection_end (ESelectionModel *selection, int row)
{
    ETreeSelectionModel *etsm = E_TREE_SELECTION_MODEL(selection);
    etsm_select_single_row(selection, etsm->priv->selection_start_row);
    if (etsm->priv->selection_start_row != -1)
        etsm->priv->cursor_path = etsm_node_at_row(etsm, etsm->priv->selection_start_row);
    else
        etsm->priv->cursor_path = NULL;
    e_selection_model_move_selection_end(selection, row);
}


/* Standard functions */
static void
etsm_foreach_all_recurse (ETreeSelectionModel *etsm,
              ETreePath path,
              ETreeForeachFunc callback,
              gpointer closure)
{
    ETreePath model_path;
    ETreePath child;

    model_path = e_tree_sorted_view_to_model_path(etsm->priv->ets, path);
    callback(model_path, closure);

    child = e_tree_model_node_get_first_child(E_TREE_MODEL(etsm->priv->ets), path);
    for ( ; child; child = e_tree_model_node_get_next(E_TREE_MODEL(etsm->priv->ets), child))
        if (child)
            etsm_foreach_all_recurse (etsm, child, callback, closure);
}

static void
etsm_foreach_recurse (ETreeSelectionModel *etsm,
              ETreeSelectionModelNode *selection_node,
              ETreePath path,
              ETreeForeachFunc callback,
              gpointer closure)
{
    if (selection_node->all_children_selected) {
        if (path)
            etsm_foreach_all_recurse(etsm, path, callback, closure);
        return;
    }
    if (!selection_node->any_children_selected)
        return;

    if (selection_node->selected) {
        ETreePath model_path = e_tree_sorted_view_to_model_path(etsm->priv->ets, path);
        callback(model_path, closure);
    }

    if (selection_node->children) {
        ETreePath child = e_tree_model_node_get_first_child(E_TREE_MODEL(etsm->priv->ets), path);
        int i;
        for (i = 0; i < selection_node->num_children; i++, child = e_tree_model_node_get_next(E_TREE_MODEL(etsm->priv->ets), child))
            if (selection_node->children[i])
                etsm_foreach_recurse (etsm, selection_node->children[i], child, callback, closure);
    }
}

void
e_tree_selection_model_foreach   (ETreeSelectionModel *etsm,
                  ETreeForeachFunc     callback,
                  gpointer             closure)
{
    if (etsm->priv->root) {
        etsm_foreach_recurse(etsm, etsm->priv->root, e_tree_model_get_root(E_TREE_MODEL(etsm->priv->ets)), callback, closure);
    }
}


static void
e_tree_selection_model_init (ETreeSelectionModel *etsm)
{
    ETreeSelectionModelPriv *priv;
    priv = g_new(ETreeSelectionModelPriv, 1);
    etsm->priv = priv;

    priv->root = NULL;
    priv->cursor_path = NULL;
    priv->cursor_col = -1;

    priv->tree_model_pre_change_id      = 0;
    priv->tree_model_node_changed_id      = 0;
    priv->tree_model_node_data_changed_id = 0;
    priv->tree_model_node_col_changed_id  = 0;
    priv->tree_model_node_inserted_id     = 0;
    priv->tree_model_node_removed_id      = 0;

}

static void
e_tree_selection_model_class_init (ETreeSelectionModelClass *klass)
{
    GtkObjectClass *object_class;
    ESelectionModelClass *esm_class;

    parent_class = gtk_type_class (e_selection_model_get_type ());

    object_class = GTK_OBJECT_CLASS(klass);
    esm_class = E_SELECTION_MODEL_CLASS(klass);

    object_class->destroy = etsm_destroy;
    object_class->get_arg = etsm_get_arg;
    object_class->set_arg = etsm_set_arg;

    esm_class->is_row_selected    = etsm_is_row_selected    ;
    esm_class->foreach            = etsm_foreach            ;
    esm_class->clear              = etsm_clear              ;
#if 0
    esm_class->selected_count     = etsm_selected_count     ;
#endif
    esm_class->select_all         = etsm_select_all         ;
    esm_class->invert_selection   = etsm_invert_selection   ;
    esm_class->row_count          = etsm_row_count          ;

    esm_class->change_one_row     = etsm_change_one_row     ;
    esm_class->change_cursor      = etsm_change_cursor      ;
    esm_class->cursor_row         = etsm_cursor_row         ;
    esm_class->cursor_col         = etsm_cursor_col         ;

    esm_class->select_single_row  = etsm_select_single_row  ;
    esm_class->toggle_single_row  = etsm_toggle_single_row  ;
    esm_class->move_selection_end = etsm_move_selection_end ;
    esm_class->set_selection_end  = etsm_set_selection_end  ;

    gtk_object_add_arg_type ("ETreeSelectionModel::cursor_row", GTK_TYPE_INT,
                 GTK_ARG_READWRITE, ARG_CURSOR_ROW);
    gtk_object_add_arg_type ("ETreeSelectionModel::cursor_col", GTK_TYPE_INT,
                 GTK_ARG_READWRITE, ARG_CURSOR_COL);
    gtk_object_add_arg_type ("ETreeSelectionModel::model", E_TREE_MODEL_TYPE,
                 GTK_ARG_READWRITE, ARG_MODEL);
    gtk_object_add_arg_type ("ETreeSelectionModel::etta", E_TREE_TABLE_ADAPTER_TYPE,
                 GTK_ARG_READWRITE, ARG_ETTA);
    gtk_object_add_arg_type ("ETreeSelectionModel::ets", E_TREE_SORTED_TYPE,
                 GTK_ARG_READWRITE, ARG_ETS);
}

ESelectionModel *
e_tree_selection_model_new (void)
{
    return gtk_type_new(e_tree_selection_model_get_type());
}

E_MAKE_TYPE(e_tree_selection_model, "ETreeSelectionModel", ETreeSelectionModel,
        e_tree_selection_model_class_init, e_tree_selection_model_init, PARENT_TYPE);