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

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* 
 * e-tree.c
 * Copyright 2000, 2001, Ximian, Inc.
 *
 * Authors:
 *   Chris Lahey <clahey@ximian.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License, version 2, as published by the Free Software Foundation.
 *
 * 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.
 */

#include <config.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdio.h>
#include <gdk/gdkkeysyms.h>
#include <gtk/gtksignal.h>
#include <libgnomeui/gnome-canvas-rect-ellipse.h>

#include "gal/util/e-i18n.h"
#include <gal/util/e-util.h>
#include <gal/widgets/e-canvas.h>

#include <gal/e-table/e-table-column-specification.h>
#include <gal/e-table/e-table-header-item.h>
#include <gal/e-table/e-table-header.h>
#include <gal/e-table/e-table-item.h>
#include <gal/e-table/e-table-sort-info.h>
#include <gal/e-table/e-table-utils.h>

#ifdef E_TREE_USE_TREE_SELECTION
#include <gal/e-table/e-tree-selection-model.h>
#else
#include <gal/e-table/e-table-selection-model.h>
#endif

#include <gal/e-table/e-tree-sorted.h>
#include <gal/e-table/e-tree-table-adapter.h>

#include "e-tree.h"

#define COLUMN_HEADER_HEIGHT 16

#define PARENT_TYPE gtk_table_get_type ()

static GtkObjectClass *parent_class;

#define d(x)

#if d(!)0
#define e_table_item_leave_edit_(x) (e_table_item_leave_edit((x)), g_print ("%s: e_table_item_leave_edit\n", __FUNCTION__))
#else
#define e_table_item_leave_edit_(x) (e_table_item_leave_edit((x)))
#endif

enum {
    CURSOR_CHANGE,
    CURSOR_ACTIVATED,
    SELECTION_CHANGE,
    DOUBLE_CLICK,
    RIGHT_CLICK,
    CLICK,
    KEY_PRESS,
    START_DRAG,

    TREE_DRAG_BEGIN,
    TREE_DRAG_END,
    TREE_DRAG_DATA_GET,
    TREE_DRAG_DATA_DELETE,

    TREE_DRAG_LEAVE,
    TREE_DRAG_MOTION,
    TREE_DRAG_DROP,
    TREE_DRAG_DATA_RECEIVED,

    LAST_SIGNAL
};

enum {
    ARG_0,
    ARG_LENGTH_THRESHOLD,
    ARG_HORIZONTAL_DRAW_GRID,
    ARG_VERTICAL_DRAW_GRID,
    ARG_DRAW_FOCUS,
    ARG_ETTA,
    ARG_UNIFORM_ROW_HEIGHT,
};

enum {
    ET_SCROLL_UP = 1 << 0,
    ET_SCROLL_DOWN = 1 << 1,
    ET_SCROLL_LEFT = 1 << 2,
    ET_SCROLL_RIGHT = 1 << 3
};

struct ETreePriv {
    ETreeModel *model;
    ETreeSorted *sorted;
    ETreeTableAdapter *etta;

    ETableHeader *full_header, *header;

    ETableSortInfo *sort_info;
    ESorter   *sorter;

    ESelectionModel *selection;
    ETableSpecification *spec;

    int reflow_idle_id;
    int scroll_idle_id;
    int hover_idle_id;

    int table_model_change_id;
    int table_row_change_id;
    int table_cell_change_id;
    int table_rows_inserted_id;
    int table_rows_deleted_id;

    GnomeCanvas *header_canvas, *table_canvas;

    GnomeCanvasItem *header_item, *root;

    GnomeCanvasItem *white_item;
    GnomeCanvasItem *item;

    gint length_threshold;

    /*
     * Configuration settings
     */
    guint alternating_row_colors : 1;
    guint horizontal_draw_grid : 1;
    guint vertical_draw_grid : 1;
    guint draw_focus : 1;
    guint row_selection_active : 1;

    guint horizontal_scrolling : 1;

    guint scroll_direction : 4;

    guint do_drag : 1;

    guint uniform_row_height : 1;

    ECursorMode cursor_mode;

    int drop_row;
    ETreePath drop_path;
    int drop_col;

    GnomeCanvasItem *drop_highlight;
    int last_drop_x;
    int last_drop_y;
    int last_drop_time;
    GdkDragContext *last_drop_context;

    int hover_x;
    int hover_y;

    int drag_row;
    ETreePath drag_path;
    int drag_col;
    ETreeDragSourceSite *site;

    GList *expanded_list;
};

static gint et_signals [LAST_SIGNAL] = { 0, };

static void et_grab_focus (GtkWidget *widget);

static void et_drag_begin (GtkWidget *widget,
               GdkDragContext *context,
               ETree *et);
static void et_drag_end (GtkWidget *widget,
             GdkDragContext *context,
             ETree *et);
static void et_drag_data_get(GtkWidget *widget,
                 GdkDragContext *context,
                 GtkSelectionData *selection_data,
                 guint info,
                 guint time,
                 ETree *et);
static void et_drag_data_delete(GtkWidget *widget,
                GdkDragContext *context,
                ETree *et);

static void et_drag_leave(GtkWidget *widget,
              GdkDragContext *context,
              guint time,
              ETree *et);
static gboolean et_drag_motion(GtkWidget *widget,
                   GdkDragContext *context,
                   gint x,
                   gint y,
                   guint time,
                   ETree *et);
static gboolean et_drag_drop(GtkWidget *widget,
                 GdkDragContext *context,
                 gint x,
                 gint y,
                 guint time,
                 ETree *et);
static void et_drag_data_received(GtkWidget *widget,
                  GdkDragContext *context,
                  gint x,
                  gint y,
                  GtkSelectionData *selection_data,
                  guint info,
                  guint time,
                  ETree *et);

static gint et_focus (GtkContainer *container, GtkDirectionType direction);

static void scroll_off (ETree *et);
static void scroll_on (ETree *et, guint scroll_direction);
static void hover_off (ETree *et);
static void hover_on (ETree *et, int x, int y);

static void
et_disconnect_from_etta (ETree *et)
{
    if (et->priv->table_model_change_id != 0)
        gtk_signal_disconnect (GTK_OBJECT (et->priv->etta),
                       et->priv->table_model_change_id);
    if (et->priv->table_row_change_id != 0)
        gtk_signal_disconnect (GTK_OBJECT (et->priv->etta),
                       et->priv->table_row_change_id);
    if (et->priv->table_cell_change_id != 0)
        gtk_signal_disconnect (GTK_OBJECT (et->priv->etta),
                       et->priv->table_cell_change_id);
    if (et->priv->table_rows_inserted_id != 0)
        gtk_signal_disconnect (GTK_OBJECT (et->priv->etta),
                       et->priv->table_rows_inserted_id);
    if (et->priv->table_rows_deleted_id != 0)
        gtk_signal_disconnect (GTK_OBJECT (et->priv->etta),
                       et->priv->table_rows_deleted_id);

    et->priv->table_model_change_id = 0;
    et->priv->table_row_change_id = 0;
    et->priv->table_cell_change_id = 0;
    et->priv->table_rows_inserted_id = 0;
    et->priv->table_rows_deleted_id = 0;
}

static void
et_destroy (GtkObject *object)
{
    ETree *et = E_TREE (object);

    if (et->priv->reflow_idle_id)
        g_source_remove(et->priv->reflow_idle_id);
    et->priv->reflow_idle_id = 0;

    scroll_off (et);
    hover_off (et);
    e_free_string_list (et->priv->expanded_list);

    et_disconnect_from_etta (et);

    gtk_object_unref (GTK_OBJECT (et->priv->etta));
    gtk_object_unref (GTK_OBJECT (et->priv->model));
    gtk_object_unref (GTK_OBJECT (et->priv->sorted));
    gtk_object_unref (GTK_OBJECT (et->priv->full_header));
    gtk_object_unref (GTK_OBJECT (et->priv->header));
    gtk_object_unref (GTK_OBJECT (et->priv->sort_info));
    gtk_object_unref (GTK_OBJECT (et->priv->selection));
    if (et->priv->spec)
        gtk_object_unref (GTK_OBJECT (et->priv->spec));

    if (et->priv->sorter)
        gtk_object_unref (GTK_OBJECT (et->priv->sorter));

    if (et->priv->header_canvas)
        gtk_widget_destroy (GTK_WIDGET (et->priv->header_canvas));

    if (et->priv->site)
        e_tree_drag_source_unset (et);

    gtk_widget_destroy (GTK_WIDGET (et->priv->table_canvas));

    g_free(et->priv);
    et->priv = NULL;

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

static void
e_tree_init (GtkObject *object)
{
    ETree *e_tree                                    = E_TREE (object);
    GtkTable *gtk_table                              = GTK_TABLE (object);

    GTK_WIDGET_SET_FLAGS (e_tree, GTK_CAN_FOCUS);

    gtk_table->homogeneous                           = FALSE;

    e_tree->priv                                     = g_new(ETreePriv, 1);

    e_tree->priv->model                              = NULL;
    e_tree->priv->sorted                             = NULL;
    e_tree->priv->etta                               = NULL;

    e_tree->priv->full_header                        = NULL;
    e_tree->priv->header                             = NULL;

    e_tree->priv->sort_info                          = NULL;
    e_tree->priv->sorter                             = NULL;
    e_tree->priv->reflow_idle_id                     = 0;
    e_tree->priv->scroll_idle_id                     = 0;
    e_tree->priv->hover_idle_id                     = 0;

    e_tree->priv->alternating_row_colors             = 1;
    e_tree->priv->horizontal_draw_grid               = 1;
    e_tree->priv->vertical_draw_grid                 = 1;
    e_tree->priv->draw_focus                         = 1;
    e_tree->priv->cursor_mode                        = E_CURSOR_SIMPLE;
    e_tree->priv->length_threshold                   = 200;
    e_tree->priv->uniform_row_height                 = FALSE;

    e_tree->priv->row_selection_active               = FALSE;
    e_tree->priv->horizontal_scrolling               = FALSE;

    e_tree->priv->drop_row                           = -1;
    e_tree->priv->drop_path                          = NULL;
    e_tree->priv->drop_col                           = -1;
    e_tree->priv->drop_highlight                     = NULL;

    e_tree->priv->last_drop_x                        = 0;
    e_tree->priv->last_drop_y                        = 0;
    e_tree->priv->last_drop_time                     = 0;
    e_tree->priv->last_drop_context                  = NULL;

    e_tree->priv->hover_x                            = 0;
    e_tree->priv->hover_y                            = 0;

    e_tree->priv->drag_row                           = -1;
    e_tree->priv->drag_path                          = NULL;
    e_tree->priv->drag_col                           = -1;

    e_tree->priv->expanded_list                      = NULL;

    e_tree->priv->site                               = NULL;
    e_tree->priv->do_drag                            = FALSE;

#ifdef E_TREE_USE_TREE_SELECTION
    e_tree->priv->selection                          = E_SELECTION_MODEL(e_tree_selection_model_new());
#else
    e_tree->priv->selection                          = E_SELECTION_MODEL(e_table_selection_model_new());
#endif
    e_tree->priv->spec                               = NULL;

    e_tree->priv->header_canvas                      = NULL;
    e_tree->priv->table_canvas                       = NULL;

    e_tree->priv->header_item                        = NULL;
    e_tree->priv->root                               = NULL;

    e_tree->priv->white_item                         = NULL;
    e_tree->priv->item                               = NULL;
}

/* Grab_focus handler for the ETree */
static void
et_grab_focus (GtkWidget *widget)
{
    ETree *e_tree;

    e_tree = E_TREE (widget);

    gtk_widget_grab_focus (GTK_WIDGET (e_tree->priv->table_canvas));
}

/* Focus handler for the ETree */
static gint
et_focus (GtkContainer *container, GtkDirectionType direction)
{
    ETree *e_tree;

    e_tree = E_TREE (container);

    if (container->focus_child) {
        gtk_container_set_focus_child (container, NULL);
        return FALSE;
    }

    return gtk_container_focus (GTK_CONTAINER (e_tree->priv->table_canvas), direction);
}

static void
set_header_canvas_width (ETree *e_tree)
{
    double oldwidth, oldheight, width;

    if (!(e_tree->priv->header_item && e_tree->priv->header_canvas && e_tree->priv->table_canvas))
        return;

    gnome_canvas_get_scroll_region (GNOME_CANVAS (e_tree->priv->table_canvas),
                    NULL, NULL, &width, NULL);
    gnome_canvas_get_scroll_region (GNOME_CANVAS (e_tree->priv->header_canvas),
                    NULL, NULL, &oldwidth, &oldheight);

    if (oldwidth != width ||
        oldheight != E_TABLE_HEADER_ITEM (e_tree->priv->header_item)->height - 1)
        gnome_canvas_set_scroll_region (
                        GNOME_CANVAS (e_tree->priv->header_canvas),
                        0, 0, width, /*  COLUMN_HEADER_HEIGHT - 1 */
                        E_TABLE_HEADER_ITEM (e_tree->priv->header_item)->height - 1);

}

static void
header_canvas_size_allocate (GtkWidget *widget, GtkAllocation *alloc, ETree *e_tree)
{
    set_header_canvas_width (e_tree);

    /* When the header item is created ->height == 0,
       as the font is only created when everything is realized.
       So we set the usize here as well, so that the size of the
       header is correct */
    if (GTK_WIDGET (e_tree->priv->header_canvas)->allocation.height !=
        E_TABLE_HEADER_ITEM (e_tree->priv->header_item)->height)
        gtk_widget_set_usize (GTK_WIDGET (e_tree->priv->header_canvas), -1,
                      E_TABLE_HEADER_ITEM (e_tree->priv->header_item)->height);
}

static void
e_tree_setup_header (ETree *e_tree)
{
    char *pointer;
    e_tree->priv->header_canvas = GNOME_CANVAS (e_canvas_new ());
    GTK_WIDGET_UNSET_FLAGS (e_tree->priv->header_canvas, GTK_CAN_FOCUS);

    gtk_widget_show (GTK_WIDGET (e_tree->priv->header_canvas));

    pointer = g_strdup_printf("%p", e_tree);

    e_tree->priv->header_item = gnome_canvas_item_new (
        gnome_canvas_root (e_tree->priv->header_canvas),
        e_table_header_item_get_type (),
        "ETableHeader", e_tree->priv->header,
        "full_header", e_tree->priv->full_header,
        "sort_info", e_tree->priv->sort_info,
        "dnd_code", pointer,
        "tree", e_tree,
        NULL);

    g_free(pointer);

    gtk_signal_connect (
        GTK_OBJECT (e_tree->priv->header_canvas), "size_allocate",
        GTK_SIGNAL_FUNC (header_canvas_size_allocate), e_tree);

    gtk_widget_set_usize (GTK_WIDGET (e_tree->priv->header_canvas), -1,
                  E_TABLE_HEADER_ITEM (e_tree->priv->header_item)->height);
}

static gboolean
tree_canvas_reflow_idle (ETree *e_tree)
{
    gdouble height, width;
    gdouble item_height;
    gdouble oldheight, oldwidth;
    GtkAllocation *alloc = &(GTK_WIDGET (e_tree->priv->table_canvas)->allocation);

    gtk_object_get (GTK_OBJECT (e_tree->priv->item),
            "height", &height,
            "width", &width,
            NULL);
    item_height = height;
    height = MAX ((int)height, alloc->height);
    width = MAX((int)width, alloc->width);
    /* I have no idea why this needs to be -1, but it works. */
    gnome_canvas_get_scroll_region (GNOME_CANVAS (e_tree->priv->table_canvas),
                    NULL, NULL, &oldwidth, &oldheight);

    if (oldwidth != width - 1 ||
        oldheight != height - 1) {
        gnome_canvas_set_scroll_region (GNOME_CANVAS (e_tree->priv->table_canvas),
                        0, 0, width - 1, height - 1);
        set_header_canvas_width (e_tree);
    }
    gtk_object_set (GTK_OBJECT (e_tree->priv->white_item),
            "y1", item_height,
            "x2", width,
            "y2", height,
            NULL);
    e_tree->priv->reflow_idle_id = 0;
    return FALSE;
}

static void
tree_canvas_size_allocate (GtkWidget *widget, GtkAllocation *alloc,
                ETree *e_tree)
{
    gdouble width;
    gdouble height;
    gdouble item_height;

    width = alloc->width;
    gtk_object_get (GTK_OBJECT (e_tree->priv->item),
            "height", &height,
            NULL);
    item_height = height;
    height = MAX ((int)height, alloc->height);

    gtk_object_set (GTK_OBJECT (e_tree->priv->item),
            "width", width,
            NULL);
    gtk_object_set (GTK_OBJECT (e_tree->priv->header),
            "width", width,
            NULL);
    if (e_tree->priv->reflow_idle_id)
        g_source_remove(e_tree->priv->reflow_idle_id);
    tree_canvas_reflow_idle(e_tree);
}

static void
tree_canvas_reflow (GnomeCanvas *canvas, ETree *e_tree)
{
    if (!e_tree->priv->reflow_idle_id)
        e_tree->priv->reflow_idle_id = g_idle_add_full (400, (GSourceFunc) tree_canvas_reflow_idle, e_tree, NULL);
}

static void
item_cursor_change (ETableItem *eti, int row, ETree *et)
{
    ETreePath path = e_tree_table_adapter_node_at_row(et->priv->etta, row);
    path = e_tree_sorted_view_to_model_path(et->priv->sorted, path);
    gtk_signal_emit (GTK_OBJECT (et),
             et_signals [CURSOR_CHANGE],
             row, path);
}

static void
item_cursor_activated (ETableItem *eti, int row, ETree *et)
{
    ETreePath path = e_tree_table_adapter_node_at_row(et->priv->etta, row);
    if (path)
        path = e_tree_sorted_view_to_model_path(et->priv->sorted, path);
    gtk_signal_emit (GTK_OBJECT (et),
             et_signals [CURSOR_ACTIVATED],
             row, path);
    d(g_print("%s: Emitted CURSOR_ACTIVATED signal on row: %d and path: 0x%p\n", __FUNCTION__, row, path));
}

static void
item_double_click (ETableItem *eti, int row, int col, GdkEvent *event, ETree *et)
{
    ETreePath path = e_tree_table_adapter_node_at_row(et->priv->etta, row);
    path = e_tree_sorted_view_to_model_path(et->priv->sorted, path);
    gtk_signal_emit (GTK_OBJECT (et),
             et_signals [DOUBLE_CLICK],
             row, path, col, event);
}

static gint
item_right_click (ETableItem *eti, int row, int col, GdkEvent *event, ETree *et)
{
    int return_val = 0;
    ETreePath path = e_tree_table_adapter_node_at_row(et->priv->etta, row);
    path = e_tree_sorted_view_to_model_path(et->priv->sorted, path);
    gtk_signal_emit (GTK_OBJECT (et),
             et_signals [RIGHT_CLICK],
             row, path, col, event, &return_val);
    return return_val;
}

static gint
item_click (ETableItem *eti, int row, int col, GdkEvent *event, ETree *et)
{
    int return_val = 0;
    ETreePath path = e_tree_table_adapter_node_at_row(et->priv->etta, row);
    path = e_tree_sorted_view_to_model_path(et->priv->sorted, path);
    gtk_signal_emit (GTK_OBJECT (et),
             et_signals [CLICK],
             row, path, col, event, &return_val);
    return return_val;
}

static gint
item_key_press (ETableItem *eti, int row, int col, GdkEvent *event, ETree *et)
{
    int return_val = 0;
    GdkEventKey *key = (GdkEventKey *) event;
    ETreePath path;
    int y, row_local, col_local;
    GtkAdjustment *vadj;

    switch (key->keyval) {
    case GDK_Page_Down:
    case GDK_KP_Page_Down:
        vadj = gtk_layout_get_vadjustment (GTK_LAYOUT (et->priv->table_canvas));
        y = CLAMP(vadj->value + (2 * vadj->page_size - 50), 0, vadj->upper);
        y -= vadj->value;
        e_tree_get_cell_at (et, 30, y, &row_local, &col_local);

        if (row_local == -1)
            row_local = e_table_model_row_count (E_TABLE_MODEL(et->priv->etta)) - 1;

        row_local = e_tree_view_to_model_row (et, row_local);
        col_local = e_selection_model_cursor_col (E_SELECTION_MODEL (et->priv->selection));
        e_selection_model_select_as_key_press (E_SELECTION_MODEL (et->priv->selection), row_local, col_local, key->state);

        return_val = 1;
        break;
    case GDK_Page_Up:
    case GDK_KP_Page_Up:
        vadj = gtk_layout_get_vadjustment (GTK_LAYOUT (et->priv->table_canvas));
        y = CLAMP(vadj->value - (vadj->page_size - 50), 0, vadj->upper);
        y -= vadj->value;
        e_tree_get_cell_at (et, 30, y, &row_local, &col_local);

        if (row_local == -1)
            row_local = e_table_model_row_count (E_TABLE_MODEL(et->priv->etta)) - 1;

        row_local = e_tree_view_to_model_row (et, row_local);
        col_local = e_selection_model_cursor_col (E_SELECTION_MODEL (et->priv->selection));
        e_selection_model_select_as_key_press (E_SELECTION_MODEL (et->priv->selection), row_local, col_local, key->state);

        return_val = 1;
        break;
    case '=':
    case GDK_Right:
    case GDK_KP_Right:
        if (row != -1) {
            path = e_tree_table_adapter_node_at_row(et->priv->etta, row);
            if (path)
                e_tree_table_adapter_node_set_expanded (et->priv->etta, path, TRUE);
        }
        return_val = 1;
        break;
    case '-':
    case GDK_Left:
    case GDK_KP_Left:
        if (row != -1) {
            path = e_tree_table_adapter_node_at_row(et->priv->etta, row);
            if (path)
                e_tree_table_adapter_node_set_expanded (et->priv->etta, path, FALSE);
        }
        return_val = 1;
        break;
    default:
        path = e_tree_table_adapter_node_at_row(et->priv->etta, row);
        path = e_tree_sorted_view_to_model_path(et->priv->sorted, path);
        gtk_signal_emit (GTK_OBJECT (et),
                 et_signals [KEY_PRESS],
                 row, path, col, event, &return_val);
        break;
    }
    return return_val;
}

static gint
item_start_drag (ETableItem *eti, int row, int col, GdkEvent *event, ETree *et)
{
    ETreePath path;
    gint return_val = 0;

    path = e_tree_table_adapter_node_at_row(et->priv->etta, row);
    path = e_tree_sorted_view_to_model_path(et->priv->sorted, path);

    gtk_signal_emit (GTK_OBJECT (et),
             et_signals [START_DRAG],
             row, path, col, event, &return_val);

    return return_val;
}

static void
et_selection_model_selection_changed (ETableSelectionModel *etsm, ETree *et)
{
    gtk_signal_emit (GTK_OBJECT (et),
             et_signals [SELECTION_CHANGE]);
}

static void
et_selection_model_selection_row_changed (ETableSelectionModel *etsm, int row, ETree *et)
{
    gtk_signal_emit (GTK_OBJECT (et),
             et_signals [SELECTION_CHANGE]);
}

static void
et_build_item (ETree *et)
{
    et->priv->item = gnome_canvas_item_new(GNOME_CANVAS_GROUP (gnome_canvas_root(et->priv->table_canvas)),
                     e_table_item_get_type(),
                     "ETableHeader", et->priv->header,
                     "ETableModel", et->priv->etta,
                     "selection_model", et->priv->selection,
                     "alternating_row_colors", et->priv->alternating_row_colors,
                     "horizontal_draw_grid", et->priv->horizontal_draw_grid,
                     "vertical_draw_grid", et->priv->vertical_draw_grid,
                     "drawfocus", et->priv->draw_focus,
                     "cursor_mode", et->priv->cursor_mode,
                     "length_threshold", et->priv->length_threshold,
                     "uniform_row_height", et->priv->uniform_row_height,
                     NULL);

    gtk_signal_connect (GTK_OBJECT (et->priv->item), "cursor_change",
                GTK_SIGNAL_FUNC (item_cursor_change), et);
    gtk_signal_connect (GTK_OBJECT (et->priv->item), "cursor_activated",
                GTK_SIGNAL_FUNC (item_cursor_activated), et);
    gtk_signal_connect (GTK_OBJECT (et->priv->item), "double_click",
                GTK_SIGNAL_FUNC (item_double_click), et);
    gtk_signal_connect (GTK_OBJECT (et->priv->item), "right_click",
                GTK_SIGNAL_FUNC (item_right_click), et);
    gtk_signal_connect (GTK_OBJECT (et->priv->item), "click",
                GTK_SIGNAL_FUNC (item_click), et);
    gtk_signal_connect (GTK_OBJECT (et->priv->item), "key_press",
                GTK_SIGNAL_FUNC (item_key_press), et);
    gtk_signal_connect (GTK_OBJECT (et->priv->item), "start_drag",
                GTK_SIGNAL_FUNC (item_start_drag), et);
}

static void
et_canvas_realize (GtkWidget *canvas, ETree *e_tree)
{
    gnome_canvas_item_set(
        e_tree->priv->white_item,
        "fill_color_gdk", &GTK_WIDGET(e_tree->priv->table_canvas)->style->base[GTK_STATE_NORMAL],
        NULL);
}

static gint
et_canvas_root_event (GnomeCanvasItem *root, GdkEvent *event, ETree *e_tree)
{
    switch (event->type) {
    case GDK_BUTTON_PRESS:
    case GDK_2BUTTON_PRESS:
    case GDK_BUTTON_RELEASE:
        if (event->button.button != 4 && event->button.button != 5) {
            if (GTK_WIDGET_HAS_FOCUS(root->canvas)) {
                GnomeCanvasItem *item = GNOME_CANVAS(root->canvas)->focused_item;

                if (E_IS_TABLE_ITEM(item)) {
                    e_table_item_leave_edit_(E_TABLE_ITEM(item));
                    return TRUE;
                }
            }
        }
        break;
    default:
        break;
    }

    return FALSE;
}

/* Handler for focus events in the table_canvas; we have to repaint ourselves
 * and give the focus to some ETableItem.
 */
static gint
table_canvas_focus_event_cb (GtkWidget *widget, GdkEventFocus *event, gpointer data)
{
    GnomeCanvas *canvas;
    ETree *tree;

    gtk_widget_queue_draw (widget);

    if (!event->in)
        return TRUE;

    canvas = GNOME_CANVAS (widget);
    tree = E_TREE (data);

    if (!canvas->focused_item) {
        e_table_item_set_cursor (E_TABLE_ITEM (tree->priv->item), 0, 0);
        gnome_canvas_item_grab_focus (tree->priv->item);
    }

    return TRUE;
}

static void
e_tree_setup_table (ETree *e_tree)
{
    e_tree->priv->table_canvas = GNOME_CANVAS (e_canvas_new ());
    gtk_signal_connect (
        GTK_OBJECT (e_tree->priv->table_canvas), "size_allocate",
        GTK_SIGNAL_FUNC (tree_canvas_size_allocate), e_tree);
    gtk_signal_connect (
        GTK_OBJECT (e_tree->priv->table_canvas), "focus_in_event",
        GTK_SIGNAL_FUNC (table_canvas_focus_event_cb), e_tree);
    gtk_signal_connect (
        GTK_OBJECT (e_tree->priv->table_canvas), "focus_out_event",
        GTK_SIGNAL_FUNC (table_canvas_focus_event_cb), e_tree);

    gtk_signal_connect (
        GTK_OBJECT (e_tree->priv->table_canvas), "drag_begin",
        GTK_SIGNAL_FUNC (et_drag_begin), e_tree);
    gtk_signal_connect (
        GTK_OBJECT (e_tree->priv->table_canvas), "drag_end",
        GTK_SIGNAL_FUNC (et_drag_end), e_tree);
    gtk_signal_connect (
        GTK_OBJECT (e_tree->priv->table_canvas), "drag_data_get",
        GTK_SIGNAL_FUNC (et_drag_data_get), e_tree);
    gtk_signal_connect (
        GTK_OBJECT (e_tree->priv->table_canvas), "drag_data_delete",
        GTK_SIGNAL_FUNC (et_drag_data_delete), e_tree);
    gtk_signal_connect (
        GTK_OBJECT (e_tree), "drag_motion",
        GTK_SIGNAL_FUNC (et_drag_motion), e_tree);
    gtk_signal_connect (
        GTK_OBJECT (e_tree), "drag_leave",
        GTK_SIGNAL_FUNC (et_drag_leave), e_tree);
    gtk_signal_connect (
        GTK_OBJECT (e_tree), "drag_drop",
        GTK_SIGNAL_FUNC (et_drag_drop), e_tree);
    gtk_signal_connect (
        GTK_OBJECT (e_tree), "drag_data_received",
        GTK_SIGNAL_FUNC (et_drag_data_received), e_tree);

    gtk_signal_connect (GTK_OBJECT(e_tree->priv->table_canvas), "reflow",
                GTK_SIGNAL_FUNC (tree_canvas_reflow), e_tree);

    gtk_widget_show (GTK_WIDGET (e_tree->priv->table_canvas));

    e_tree->priv->white_item = gnome_canvas_item_new(
        gnome_canvas_root(e_tree->priv->table_canvas),
        gnome_canvas_rect_get_type(),
        "x1", (double) 0,
        "y1", (double) 0,
        "x2", (double) 100,
        "y2", (double) 100,
        "fill_color_gdk", &GTK_WIDGET(e_tree->priv->table_canvas)->style->base[GTK_STATE_NORMAL],
        NULL);

    gtk_signal_connect (
        GTK_OBJECT(e_tree->priv->table_canvas), "realize",
        GTK_SIGNAL_FUNC(et_canvas_realize), e_tree);
    gtk_signal_connect (
        GTK_OBJECT(gnome_canvas_root (e_tree->priv->table_canvas)), "event",
        GTK_SIGNAL_FUNC(et_canvas_root_event), e_tree);

    et_build_item(e_tree);
}

void
e_tree_set_state_object(ETree *e_tree, ETableState *state)
{
    if (e_tree->priv->header)
        gtk_object_unref(GTK_OBJECT(e_tree->priv->header));
    e_tree->priv->header = e_table_state_to_header (GTK_WIDGET(e_tree), e_tree->priv->full_header, state);

    gtk_object_set (GTK_OBJECT (e_tree->priv->header),
            "width", (double) (GTK_WIDGET(e_tree->priv->table_canvas)->allocation.width),
            NULL);

    if (e_tree->priv->sort_info)
        gtk_object_unref(GTK_OBJECT(e_tree->priv->sort_info));

    if (state->sort_info) {
        e_tree->priv->sort_info = e_table_sort_info_duplicate(state->sort_info);
        e_table_sort_info_set_can_group (e_tree->priv->sort_info, FALSE);
    } else
        e_tree->priv->sort_info = NULL;

    if (e_tree->priv->header_item)
        gtk_object_set(GTK_OBJECT(e_tree->priv->header_item),
                   "ETableHeader", e_tree->priv->header,
                   "sort_info", e_tree->priv->sort_info,
                   NULL);

    if (e_tree->priv->item)
        gtk_object_set(GTK_OBJECT(e_tree->priv->item),
                   "ETableHeader", e_tree->priv->header,
                   NULL);

    if (e_tree->priv->sorted)
        gtk_object_set(GTK_OBJECT(e_tree->priv->sorted),
                   "sort_info", e_tree->priv->sort_info,
                   NULL);
}

/**
 * e_tree_set_state:
 * @e_tree: #ETree object that will be modified
 * @state_str: a string with the XML representation of the #ETableState.
 *
 * This routine sets the state (as described by #ETableState) of the
 * #ETree object.
 */
void
e_tree_set_state (ETree      *e_tree,
           const gchar *state_str)
{
    ETableState *state;

    g_return_if_fail(e_tree != NULL);
    g_return_if_fail(E_IS_TREE(e_tree));
    g_return_if_fail(state_str != NULL);

    state = e_table_state_new();
    e_table_state_load_from_string(state, state_str);

    if (state->col_count > 0)
        e_tree_set_state_object(e_tree, state);

    gtk_object_unref(GTK_OBJECT(state));
}

/**
 * e_tree_load_state:
 * @e_tree: #ETree object that will be modified
 * @filename: name of the file containing the state to be loaded into the #ETree
 *
 * An #ETableState will be loaded form the file pointed by @filename into the
 * @e_tree object.
 */
void
e_tree_load_state (ETree      *e_tree,
            const gchar *filename)
{
    ETableState *state;

    g_return_if_fail(e_tree != NULL);
    g_return_if_fail(E_IS_TREE(e_tree));
    g_return_if_fail(filename != NULL);

    state = e_table_state_new();
    e_table_state_load_from_file(state, filename);

    if (state->col_count > 0)
        e_tree_set_state_object(e_tree, state);

    gtk_object_unref(GTK_OBJECT(state));
}

/**
 * e_tree_get_state_object:
 * @e_tree: #ETree object to act on
 *
 * Builds an #ETableState corresponding to the current state of the
 * #ETree.
 *
 * Return value:
 * The %ETableState object generated.
 **/
ETableState *
e_tree_get_state_object (ETree *e_tree)
{
    ETableState *state;
    int full_col_count;
    int i, j;

    state = e_table_state_new();
    state->sort_info = e_tree->priv->sort_info;
    if (state->sort_info)
        gtk_object_ref(GTK_OBJECT(state->sort_info));

    state->col_count = e_table_header_count (e_tree->priv->header);
    full_col_count = e_table_header_count (e_tree->priv->full_header);
    state->columns = g_new(int, state->col_count);
    state->expansions = g_new(double, state->col_count);
    for (i = 0; i < state->col_count; i++) {
        ETableCol *col = e_table_header_get_column(e_tree->priv->header, i);
        state->columns[i] = -1;
        for (j = 0; j < full_col_count; j++) {
            if (col->col_idx == e_table_header_index(e_tree->priv->full_header, j)) {
                state->columns[i] = j;
                break;
            }
        }
        state->expansions[i] = col->expansion;
    }

    return state;
}

/**
 * e_tree_get_state:
 * @e_tree: The #ETree to act on
 * 
 * Builds a state object based on the current state and returns the
 * string corresponding to that state.
 * 
 * Return value: 
 * A string describing the current state of the #ETree.
 **/
gchar *
e_tree_get_state (ETree *e_tree)
{
    ETableState *state;
    gchar *string;

    state = e_tree_get_state_object(e_tree);
    string = e_table_state_save_to_string(state);
    gtk_object_unref(GTK_OBJECT(state));
    return string;
}

/**
 * e_tree_save_state:
 * @e_tree: The #ETree to act on
 * @filename: name of the file to save to
 *
 * Saves the state of the @e_tree object into the file pointed by
 * @filename.
 **/
void
e_tree_save_state (ETree      *e_tree,
           const gchar *filename)
{
    ETableState *state;

    state = e_tree_get_state_object(e_tree);
    e_table_state_save_to_file(state, filename);
    gtk_object_unref(GTK_OBJECT(state));
}

/**
 * e_tree_get_spec:
 * @e_tree: The #ETree to query
 * 
 * Returns the specification object.
 * 
 * Return value:
 **/
ETableSpecification *
e_tree_get_spec (ETree *e_tree)
{
    return e_tree->priv->spec;
}

static void
et_table_model_changed (ETableModel *model, ETree *et)
{
    if (et->priv->horizontal_scrolling)
        e_table_header_update_horizontal(et->priv->header);
}

static void
et_table_row_changed (ETableModel *table_model, int row, ETree *et)
{
    et_table_model_changed (table_model, et);
}

static void
et_table_cell_changed (ETableModel *table_model, int view_col, int row, ETree *et)
{
    et_table_model_changed (table_model, et);
}

static void
et_table_rows_inserted (ETableModel *table_model, int row, int count, ETree *et)
{
    et_table_model_changed (table_model, et);
}

static void
et_table_rows_deleted (ETableModel *table_model, int row, int count, ETree *et)
{
    et_table_model_changed (table_model, et);
}

static void
et_connect_to_etta (ETree *et)
{
    et->priv->table_model_change_id = gtk_signal_connect (GTK_OBJECT (et->priv->etta), "model_changed",
                                  GTK_SIGNAL_FUNC (et_table_model_changed), et);

    et->priv->table_row_change_id = gtk_signal_connect (GTK_OBJECT (et->priv->etta), "model_row_changed",
                                GTK_SIGNAL_FUNC (et_table_row_changed), et);

    et->priv->table_cell_change_id = gtk_signal_connect (GTK_OBJECT (et->priv->etta), "model_cell_changed",
                                 GTK_SIGNAL_FUNC (et_table_cell_changed), et);

    et->priv->table_rows_inserted_id = gtk_signal_connect (GTK_OBJECT (et->priv->etta), "model_rows_inserted",
                                   GTK_SIGNAL_FUNC (et_table_rows_inserted), et);

    et->priv->table_rows_deleted_id = gtk_signal_connect (GTK_OBJECT (et->priv->etta), "model_rows_deleted",
                                  GTK_SIGNAL_FUNC (et_table_rows_deleted), et);

}

static ETree *
et_real_construct (ETree *e_tree, ETreeModel *etm, ETableExtras *ete,
           ETableSpecification *specification, ETableState *state)
{
    int row = 0;

    if (ete)
        gtk_object_ref(GTK_OBJECT(ete));
    else
        ete = e_table_extras_new();

    e_tree->priv->alternating_row_colors = specification->alternating_row_colors;
    e_tree->priv->horizontal_draw_grid = specification->horizontal_draw_grid;
    e_tree->priv->vertical_draw_grid = specification->vertical_draw_grid;
    e_tree->priv->draw_focus = specification->draw_focus;
    e_tree->priv->cursor_mode = specification->cursor_mode;
    e_tree->priv->full_header = e_table_spec_to_full_header(specification, ete);

    e_tree->priv->header = e_table_state_to_header (GTK_WIDGET(e_tree), e_tree->priv->full_header, state);
    e_tree->priv->horizontal_scrolling = specification->horizontal_scrolling;

    e_tree->priv->sort_info = state->sort_info;
    gtk_object_ref (GTK_OBJECT (e_tree->priv->sort_info));

    e_table_sort_info_set_can_group (e_tree->priv->sort_info, FALSE);

    gtk_object_set(GTK_OBJECT(e_tree->priv->header),
               "sort_info", e_tree->priv->sort_info,
               NULL);

    e_tree->priv->model = etm;
    gtk_object_ref (GTK_OBJECT (etm));

    e_tree->priv->sorted = e_tree_sorted_new(etm, e_tree->priv->full_header, e_tree->priv->sort_info);

    e_tree->priv->etta = E_TREE_TABLE_ADAPTER(e_tree_table_adapter_new(E_TREE_MODEL(e_tree->priv->sorted)));

    et_connect_to_etta (e_tree);

    gtk_widget_push_visual (gdk_rgb_get_visual ());
    gtk_widget_push_colormap (gdk_rgb_get_cmap ());

    e_tree->priv->sorter = e_sorter_new();

    gtk_object_set (GTK_OBJECT (e_tree->priv->selection),
            "sorter", e_tree->priv->sorter,
#ifdef E_TREE_USE_TREE_SELECTION
            "model", e_tree->priv->model,
            "ets", e_tree->priv->sorted,
            "etta", e_tree->priv->etta,
#else
            "model", e_tree->priv->etta,
#endif
            "selection_mode", specification->selection_mode,
            "cursor_mode", specification->cursor_mode,
            NULL);

    gtk_signal_connect(GTK_OBJECT(e_tree->priv->selection), "selection_changed",
               GTK_SIGNAL_FUNC(et_selection_model_selection_changed), e_tree);
    gtk_signal_connect(GTK_OBJECT(e_tree->priv->selection), "selection_row_changed",
               GTK_SIGNAL_FUNC(et_selection_model_selection_row_changed), e_tree);

    if (!specification->no_headers) {
        e_tree_setup_header (e_tree);
    }
    e_tree_setup_table (e_tree);

    gtk_layout_get_vadjustment (GTK_LAYOUT (e_tree->priv->table_canvas))->step_increment = 20;
    gtk_adjustment_changed(gtk_layout_get_vadjustment (GTK_LAYOUT (e_tree->priv->table_canvas)));
    gtk_layout_get_hadjustment (GTK_LAYOUT (e_tree->priv->table_canvas))->step_increment = 20;
    gtk_adjustment_changed(gtk_layout_get_hadjustment (GTK_LAYOUT (e_tree->priv->table_canvas)));

    if (!specification->no_headers) {
        /*
         * The header
         */
        gtk_table_attach (GTK_TABLE (e_tree), GTK_WIDGET (e_tree->priv->header_canvas),
                  0, 1, 0 + row, 1 + row,
                  GTK_FILL | GTK_EXPAND,
                  GTK_FILL, 0, 0);
        row ++;
    }
    gtk_table_attach (GTK_TABLE (e_tree), GTK_WIDGET (e_tree->priv->table_canvas),
              0, 1, 0 + row, 1 + row,
              GTK_FILL | GTK_EXPAND,
              GTK_FILL | GTK_EXPAND,
              0, 0);

    gtk_widget_pop_colormap ();
    gtk_widget_pop_visual ();

    gtk_object_unref(GTK_OBJECT(ete));

    return e_tree;
}

/**
 * e_tree_construct:
 * @e_tree: The newly created #ETree object.
 * @etm: The model for this table.
 * @ete: An optional #ETableExtras.  (%NULL is valid.)
 * @spec_str: The spec.
 * @state_str: An optional state.  (%NULL is valid.)
 * 
 * This is the internal implementation of e_tree_new() for use by
 * subclasses or language bindings.  See e_tree_new() for details.
 * 
 * Return value: 
 * The passed in value @e_tree or %NULL if there's an error.
 **/
ETree *
e_tree_construct (ETree *e_tree, ETreeModel *etm, ETableExtras *ete,
           const char *spec_str, const char *state_str)
{
    ETableSpecification *specification;
    ETableState *state;

    g_return_val_if_fail(e_tree != NULL, NULL);
    g_return_val_if_fail(E_IS_TREE(e_tree), NULL);
    g_return_val_if_fail(etm != NULL, NULL);
    g_return_val_if_fail(E_IS_TREE_MODEL(etm), NULL);
    g_return_val_if_fail(ete == NULL || E_IS_TABLE_EXTRAS(ete), NULL);
    g_return_val_if_fail(spec_str != NULL, NULL);

    specification = e_table_specification_new();
    e_table_specification_load_from_string(specification, spec_str);
    if (state_str) {
        state = e_table_state_new();
        e_table_state_load_from_string(state, state_str);
        if (state->col_count <= 0) {
            gtk_object_unref(GTK_OBJECT(state));
            state = specification->state;
            gtk_object_ref(GTK_OBJECT(state));
        }
    } else {
        state = specification->state;
        gtk_object_ref(GTK_OBJECT(state));
    }

    e_tree = et_real_construct (e_tree, etm, ete, specification, state);

    e_tree->priv->spec = specification;
    gtk_object_unref(GTK_OBJECT(state));

    return e_tree;
}

/**
 * e_tree_construct_from_spec_file:
 * @e_tree: The newly created #ETree object.
 * @etm: The model for this tree
 * @ete: An optional #ETableExtras  (%NULL is valid.)
 * @spec_fn: The filename of the spec
 * @state_fn: An optional state file  (%NULL is valid.)
 *
 * This is the internal implementation of e_tree_new_from_spec_file()
 * for use by subclasses or language bindings.  See
 * e_tree_new_from_spec_file() for details.
 * 
 * Return value: 
 * The passed in value @e_tree or %NULL if there's an error.
 **/
ETree *
e_tree_construct_from_spec_file (ETree *e_tree, ETreeModel *etm, ETableExtras *ete,
                  const char *spec_fn, const char *state_fn)
{
    ETableSpecification *specification;
    ETableState *state;

    g_return_val_if_fail(e_tree != NULL, NULL);
    g_return_val_if_fail(E_IS_TREE(e_tree), NULL);
    g_return_val_if_fail(etm != NULL, NULL);
    g_return_val_if_fail(E_IS_TREE_MODEL(etm), NULL);
    g_return_val_if_fail(ete == NULL || E_IS_TABLE_EXTRAS(ete), NULL);
    g_return_val_if_fail(spec_fn != NULL, NULL);

    specification = e_table_specification_new();
    if (!e_table_specification_load_from_file(specification, spec_fn)) {
        gtk_object_unref(GTK_OBJECT(specification));
        return NULL;
    }

    if (state_fn) {
        state = e_table_state_new();
        if (!e_table_state_load_from_file(state, state_fn)) {
            gtk_object_unref(GTK_OBJECT(state));
            state = specification->state;
            gtk_object_ref(GTK_OBJECT(state));
        }
        if (state->col_count <= 0) {
            gtk_object_unref(GTK_OBJECT(state));
            state = specification->state;
            gtk_object_ref(GTK_OBJECT(state));
        }
    } else {
        state = specification->state;
        gtk_object_ref(GTK_OBJECT(state));
    }

    e_tree = et_real_construct (e_tree, etm, ete, specification, state);

    e_tree->priv->spec = specification;
    gtk_object_unref(GTK_OBJECT(state));

    return e_tree;
}

/**
 * e_tree_new:
 * @etm: The model for this tree
 * @ete: An optional #ETableExtras  (%NULL is valid.)
 * @spec: The spec
 * @state: An optional state  (%NULL is valid.)
 * 
 * This function creates an #ETree from the given parameters.  The
 * #ETreeModel is a tree model to be represented.  The #ETableExtras
 * is an optional set of pixbufs, cells, and sorting functions to be
 * used when interpreting the spec.  If you pass in %NULL it uses the
 * default #ETableExtras.  (See e_table_extras_new()).
 *
 * @spec is the specification of the set of viewable columns and the
 * default sorting state and such.  @state is an optional string
 * specifying the current sorting state and such.  If @state is NULL,
 * then the default state from the spec will be used.
 * 
 * Return value: 
 * The newly created #ETree or %NULL if there's an error.
 **/
GtkWidget *
e_tree_new (ETreeModel *etm, ETableExtras *ete, const char *spec, const char *state)
{
    ETree *e_tree, *ret_val;

    g_return_val_if_fail(etm != NULL, NULL);
    g_return_val_if_fail(E_IS_TREE_MODEL(etm), NULL);
    g_return_val_if_fail(ete == NULL || E_IS_TABLE_EXTRAS(ete), NULL);
    g_return_val_if_fail(spec != NULL, NULL);

    e_tree = gtk_type_new (e_tree_get_type ());

    ret_val = e_tree_construct (e_tree, etm, ete, spec, state);

    if (ret_val == NULL) {
        gtk_object_unref (GTK_OBJECT (e_tree));
    }

    return (GtkWidget *) ret_val;
}

/**
 * e_tree_new_from_spec_file:
 * @etm: The model for this tree.
 * @ete: An optional #ETableExtras.  (%NULL is valid.)
 * @spec_fn: The filename of the spec.
 * @state_fn: An optional state file.  (%NULL is valid.)
 * 
 * This is very similar to e_tree_new(), except instead of passing in
 * strings you pass in the file names of the spec and state to load.
 *
 * @spec_fn is the filename of the spec to load.  If this file doesn't
 * exist, e_tree_new_from_spec_file will return %NULL.
 *
 * @state_fn is the filename of the initial state to load.  If this is
 * %NULL or if the specified file doesn't exist, the default state
 * from the spec file is used.
 * 
 * Return value: 
 * The newly created #ETree or %NULL if there's an error.
 **/
GtkWidget *
e_tree_new_from_spec_file (ETreeModel *etm, ETableExtras *ete, const char *spec_fn, const char *state_fn)
{
    ETree *e_tree, *ret_val;

    g_return_val_if_fail(etm != NULL, NULL);
    g_return_val_if_fail(E_IS_TREE_MODEL(etm), NULL);
    g_return_val_if_fail(ete == NULL || E_IS_TABLE_EXTRAS(ete), NULL);
    g_return_val_if_fail(spec_fn != NULL, NULL);

    e_tree = gtk_type_new (e_tree_get_type ());

    ret_val = e_tree_construct_from_spec_file (e_tree, etm, ete, spec_fn, state_fn);

    if (ret_val == NULL) {
        gtk_object_unref (GTK_OBJECT (e_tree));
    }

    return (GtkWidget *) ret_val;
}

void
e_tree_set_cursor (ETree *e_tree, ETreePath path)
{
#ifndef E_TREE_USE_TREE_SELECTION
    int row;
#endif
    g_return_if_fail(e_tree != NULL);
    g_return_if_fail(E_IS_TREE(e_tree));
    g_return_if_fail(path != NULL);

#ifdef E_TREE_USE_TREE_SELECTION
    e_tree_selection_model_select_single_path (E_TREE_SELECTION_MODEL(e_tree->priv->selection), path);
    e_tree_selection_model_change_cursor (E_TREE_SELECTION_MODEL(e_tree->priv->selection), path);
#else
    path = e_tree_sorted_model_to_view_path(e_tree->priv->sorted, path);

    row = e_tree_table_adapter_row_of_node(E_TREE_TABLE_ADAPTER(e_tree->priv->etta), path);

    if (row == -1)
        return;

    gtk_object_set(GTK_OBJECT(e_tree->priv->selection),
               "cursor_row", row,
               NULL);
#endif
}

ETreePath
e_tree_get_cursor (ETree *e_tree)
{
    int row;
    ETreePath path;
    g_return_val_if_fail(e_tree != NULL, NULL);
    g_return_val_if_fail(E_IS_TREE(e_tree), NULL);

    gtk_object_get(GTK_OBJECT(e_tree->priv->selection),
               "cursor_row", &row,
               NULL);
    if (row == -1)
        return NULL;
    path = e_tree_table_adapter_node_at_row(E_TREE_TABLE_ADAPTER(e_tree->priv->etta), row);
    path = e_tree_sorted_view_to_model_path(e_tree->priv->sorted, path);
    return path;
}

void
e_tree_selected_row_foreach     (ETree *e_tree,
                  EForeachFunc callback,
                  gpointer closure)
{
    g_return_if_fail(e_tree != NULL);
    g_return_if_fail(E_IS_TREE(e_tree));

    e_selection_model_foreach(e_tree->priv->selection,
                  callback,
                  closure);
}

#ifdef E_TREE_USE_TREE_SELECTION
void
e_tree_selected_path_foreach     (ETree *e_tree,
                 ETreeForeachFunc callback,
                 gpointer closure)
{
    g_return_if_fail(e_tree != NULL);
    g_return_if_fail(E_IS_TREE(e_tree));

    e_tree_selection_model_foreach(E_TREE_SELECTION_MODEL (e_tree->priv->selection),
                       callback,
                       closure);
}
#endif

EPrintable *
e_tree_get_printable (ETree *e_tree)
{
    g_return_val_if_fail(e_tree != NULL, NULL);
    g_return_val_if_fail(E_IS_TREE(e_tree), NULL);

    return e_table_item_get_printable(E_TABLE_ITEM(e_tree->priv->item));
}

static void
et_get_arg (GtkObject *o, GtkArg *arg, guint arg_id)
{
    ETree *etree = E_TREE (o);

    switch (arg_id){
    case ARG_ETTA:
        if (etree->priv->item) {
            GTK_VALUE_OBJECT (*arg) = GTK_OBJECT (etree->priv->etta);
        }
        break;
    case ARG_UNIFORM_ROW_HEIGHT:
        GTK_VALUE_BOOL (*arg) = etree->priv->uniform_row_height;
        break;

    default:
        break;
    }
}

typedef struct {
    char     *arg;
    gboolean  setting;
} bool_closure;

static void
et_set_arg (GtkObject *o, GtkArg *arg, guint arg_id)
{
    ETree *etree = E_TREE (o);

    switch (arg_id){
    case ARG_LENGTH_THRESHOLD:
        etree->priv->length_threshold = GTK_VALUE_INT (*arg);
        if (etree->priv->item) {
            gnome_canvas_item_set (GNOME_CANVAS_ITEM(etree->priv->item),
                           "length_threshold", GTK_VALUE_INT (*arg),
                           NULL);
        }
        break;

    case ARG_HORIZONTAL_DRAW_GRID:
        etree->priv->horizontal_draw_grid = GTK_VALUE_BOOL (*arg);
        if (etree->priv->item) {
            gnome_canvas_item_set (GNOME_CANVAS_ITEM(etree->priv->item),
                           "horizontal_draw_grid", GTK_VALUE_BOOL (*arg),
                           NULL);
        }
        break;

    case ARG_VERTICAL_DRAW_GRID:
        etree->priv->vertical_draw_grid = GTK_VALUE_BOOL (*arg);
        if (etree->priv->item) {
            gnome_canvas_item_set (GNOME_CANVAS_ITEM(etree->priv->item),
                           "vertical_draw_grid", GTK_VALUE_BOOL (*arg),
                           NULL);
        }
        break;
        
    case ARG_DRAW_FOCUS:
        etree->priv->draw_focus = GTK_VALUE_BOOL (*arg);
        if (etree->priv->item) {
            gnome_canvas_item_set (GNOME_CANVAS_ITEM(etree->priv->item),
                           "draw_focus", GTK_VALUE_BOOL (*arg),
                           NULL);
        }
        break;

    case ARG_UNIFORM_ROW_HEIGHT:
        etree->priv->uniform_row_height = GTK_VALUE_BOOL (*arg);
        if (etree->priv->item) {
            gnome_canvas_item_set (GNOME_CANVAS_ITEM(etree->priv->item),
                           "uniform_row_height", GTK_VALUE_BOOL (*arg),
                           NULL);
        }
        break;
    }
}

static void
set_scroll_adjustments   (ETree *tree,
              GtkAdjustment *hadjustment,
              GtkAdjustment *vadjustment)
{
    if (vadjustment != NULL) {
        vadjustment->step_increment = 20;
        gtk_adjustment_changed(vadjustment);
    }
    if (hadjustment != NULL) {
        hadjustment->step_increment = 20;
        gtk_adjustment_changed(hadjustment);
    }

    gtk_layout_set_hadjustment (GTK_LAYOUT(tree->priv->table_canvas),
                    hadjustment);
    gtk_layout_set_vadjustment (GTK_LAYOUT(tree->priv->table_canvas),
                    vadjustment);

    if (tree->priv->header_canvas != NULL)
        gtk_layout_set_hadjustment (GTK_LAYOUT(tree->priv->header_canvas),
                        hadjustment);
}

gint
e_tree_get_next_row      (ETree *e_tree,
               gint    model_row)
{
    g_return_val_if_fail(e_tree != NULL, -1);
    g_return_val_if_fail(E_IS_TREE(e_tree), -1);

    if (e_tree->priv->sorter) {
        int i;
        i = e_sorter_model_to_sorted(E_SORTER (e_tree->priv->sorter), model_row);
        i++;
        if (i < e_table_model_row_count(E_TABLE_MODEL(e_tree->priv->etta))) {
            return e_sorter_sorted_to_model(E_SORTER (e_tree->priv->sorter), i);
        } else
            return -1;
    } else
        if (model_row < e_table_model_row_count(E_TABLE_MODEL(e_tree->priv->etta)) - 1)
            return model_row + 1;
        else
            return -1;
}

gint
e_tree_get_prev_row      (ETree *e_tree,
              gint    model_row)
{
    g_return_val_if_fail(e_tree != NULL, -1);
    g_return_val_if_fail(E_IS_TREE(e_tree), -1);

    if (e_tree->priv->sorter) {
        int i;
        i = e_sorter_model_to_sorted(E_SORTER (e_tree->priv->sorter), model_row);
        i--;
        if (i >= 0)
            return e_sorter_sorted_to_model(E_SORTER (e_tree->priv->sorter), i);
        else
            return -1;
    } else
        return model_row - 1;
}

gint
e_tree_model_to_view_row        (ETree *e_tree,
                  gint    model_row)
{
    g_return_val_if_fail(e_tree != NULL, -1);
    g_return_val_if_fail(E_IS_TREE(e_tree), -1);

    if (e_tree->priv->sorter)
        return e_sorter_model_to_sorted(E_SORTER (e_tree->priv->sorter), model_row);
    else
        return model_row;
}

gint
e_tree_view_to_model_row        (ETree *e_tree,
                  gint    view_row)
{
    g_return_val_if_fail(e_tree != NULL, -1);
    g_return_val_if_fail(E_IS_TREE(e_tree), -1);

    if (e_tree->priv->sorter)
        return e_sorter_sorted_to_model (E_SORTER (e_tree->priv->sorter), view_row);
    else
        return view_row;
}


gboolean
e_tree_node_is_expanded (ETree *et, ETreePath path)
{
    path = e_tree_sorted_model_to_view_path(et->priv->sorted, path);

    g_return_val_if_fail(path, FALSE);

    return e_tree_table_adapter_node_is_expanded (et->priv->etta, path);
}

void
e_tree_node_set_expanded (ETree *et, ETreePath path, gboolean expanded)
{
    g_return_if_fail (et != NULL);
    g_return_if_fail (E_IS_TREE(et));

    path = e_tree_sorted_model_to_view_path(et->priv->sorted, path);

    e_tree_table_adapter_node_set_expanded (et->priv->etta, path, expanded);
}

void
e_tree_node_set_expanded_recurse (ETree *et, ETreePath path, gboolean expanded)
{
    g_return_if_fail (et != NULL);
    g_return_if_fail (E_IS_TREE(et));

    path = e_tree_sorted_model_to_view_path(et->priv->sorted, path);

    e_tree_table_adapter_node_set_expanded_recurse (et->priv->etta, path, expanded);
}

void
e_tree_root_node_set_visible (ETree *et, gboolean visible)
{
    g_return_if_fail (et != NULL);
    g_return_if_fail (E_IS_TREE(et));

    e_tree_table_adapter_root_node_set_visible (et->priv->etta, visible);
}

ETreePath
e_tree_node_at_row (ETree *et, int row)
{
    ETreePath path;

    path = e_tree_table_adapter_node_at_row (et->priv->etta, row);
    path = e_tree_sorted_view_to_model_path(et->priv->sorted, path);

    return path;
}

int
e_tree_row_of_node (ETree *et, ETreePath path)
{
    path = e_tree_sorted_model_to_view_path(et->priv->sorted, path);
    return e_tree_table_adapter_row_of_node (et->priv->etta, path);
}

gboolean
e_tree_root_node_is_visible(ETree *et)
{
    return e_tree_table_adapter_root_node_is_visible (et->priv->etta);
}

void
e_tree_show_node (ETree *et, ETreePath path)
{
    g_return_if_fail (et != NULL);
    g_return_if_fail (E_IS_TREE(et));

    path = e_tree_sorted_model_to_view_path(et->priv->sorted, path);

    e_tree_table_adapter_show_node (et->priv->etta, path);
}

void
e_tree_save_expanded_state (ETree *et, char *filename)
{
    g_return_if_fail (et != NULL);
    g_return_if_fail (E_IS_TREE(et));

    e_tree_table_adapter_save_expanded_state (et->priv->etta, filename);
}

void
e_tree_load_expanded_state (ETree *et, char *filename)
{
    e_tree_table_adapter_load_expanded_state (et->priv->etta, filename);
}

gint
e_tree_row_count (ETree *et)
{
    return e_table_model_row_count (E_TABLE_MODEL(et->priv->etta));
}

GtkWidget *
e_tree_get_tooltip (ETree *et)
{
    return E_CANVAS(et->priv->table_canvas)->tooltip_window;
}

void
e_tree_right_click_up (ETree *et)
{
    e_selection_model_right_click_up(et->priv->selection);
}

/**
 * e_tree_get_model:
 * @et: the ETree
 *
 * Returns the model upon which this ETree is based.
 *
 * Returns: the model
 **/
ETreeModel *
e_tree_get_model (ETree *et)
{
    g_return_val_if_fail (et != NULL, NULL);
    g_return_val_if_fail (E_IS_TREE (et), NULL);

    return et->priv->model;
}

/**
 * e_tree_get_selection_model:
 * @et: the ETree
 *
 * Returns the selection model of this ETree.
 *
 * Returns: the selection model
 **/
ESelectionModel *
e_tree_get_selection_model (ETree *et)
{
    g_return_val_if_fail (et != NULL, NULL);
    g_return_val_if_fail (E_IS_TREE (et), NULL);

    return et->priv->selection;
}


struct _ETreeDragSourceSite
{
    GdkModifierType    start_button_mask;
    GtkTargetList     *target_list;        /* Targets for drag data */
    GdkDragAction      actions;            /* Possible actions */
    GdkColormap       *colormap;             /* Colormap for drag icon */
    GdkPixmap         *pixmap;             /* Icon for drag data */
    GdkBitmap         *mask;

    /* Stored button press information to detect drag beginning */
    gint               state;
    gint               x, y;
    gint               row, col;
};

typedef enum
{
  GTK_DRAG_STATUS_DRAG,
  GTK_DRAG_STATUS_WAIT,
  GTK_DRAG_STATUS_DROP
} GtkDragStatus;

typedef struct _GtkDragDestInfo GtkDragDestInfo;
typedef struct _GtkDragSourceInfo GtkDragSourceInfo;

struct _GtkDragDestInfo
{
  GtkWidget         *widget;       /* Widget in which drag is in */
  GdkDragContext    *context;      /* Drag context */
  GtkDragSourceInfo *proxy_source; /* Set if this is a proxy drag */
  GtkSelectionData  *proxy_data;   /* Set while retrieving proxied data */
  gboolean           dropped : 1;     /* Set after we receive a drop */
  guint32            proxy_drop_time; /* Timestamp for proxied drop */
  gboolean           proxy_drop_wait : 1; /* Set if we are waiting for a
                       * status reply before sending
                       * a proxied drop on.
                       */
  gint               drop_x, drop_y; /* Position of drop */
};

struct _GtkDragSourceInfo
{
  GtkWidget         *widget;
  GtkTargetList     *target_list; /* Targets for drag data */
  GdkDragAction      possible_actions; /* Actions allowed by source */
  GdkDragContext    *context;     /* drag context */
  GtkWidget         *icon_window; /* Window for drag */
  GtkWidget         *ipc_widget;  /* GtkInvisible for grab, message passing */
  GdkCursor         *cursor;      /* Cursor for drag */
  gint hot_x, hot_y;          /* Hot spot for drag */
  gint button;            /* mouse button starting drag */

  GtkDragStatus      status;      /* drag status */
  GdkEvent          *last_event;  /* motion event waiting for response */

  gint               start_x, start_y; /* Initial position */
  gint               cur_x, cur_y;     /* Current Position */

  GList             *selections;  /* selections we've claimed */

  GtkDragDestInfo   *proxy_dest;  /* Set if this is a proxy drag */

  guint              drop_timeout;     /* Timeout for aborting drop */
  guint              destroy_icon : 1; /* If true, destroy icon_window
                    */
};

/* Drag & drop stuff. */
/* Target */

void
e_tree_drag_get_data (ETree         *tree,
              int             row,
              int             col,
              GdkDragContext *context,
              GdkAtom         target,
              guint32         time)
{
    ETreePath path;
    g_return_if_fail(tree != NULL);
    g_return_if_fail(E_IS_TREE(tree));

    path = e_tree_table_adapter_node_at_row(tree->priv->etta, row);
    path = e_tree_sorted_view_to_model_path(tree->priv->sorted, path);

    gtk_drag_get_data(GTK_WIDGET(tree),
              context,
              target,
              time);

}

#if 0
static void
e_tree_request_hightlight_redraw (ETree *tree)
{
    int row = tree->drop_highlight_row;
    int col = tree->drop_highlight_col;

    if (row != -1) {
        int x, y, width, height;
        if (col == -1) {
            e_tree_get_cell_geometry (tree, row, 0, &x, &y, &width, &height);
            x = 0;
            width = tree->allocation.width;
        } else {
            e_tree_get_cell_geometry (tree, row, col, &x, &y, &width, &height);
            x += GTK_LAYOUT(tree->priv->table_canvas)->hadjustment->value;
        }
        y += GTK_LAYOUT(tree->priv->table_canvas)->vadjustment->value;
        gnome_canvas_request_redraw (tree->priv->table_canvas, x, y, x + width - 1, y + height - 1);
    }
}
#endif

/**
 * e_tree_drag_highlight:
 * @tree:
 * @row:
 * @col:
 *
 * Set col to -1 to highlight the entire row.
 * Set row to -1 to turn off the highlight.
 */
void
e_tree_drag_highlight (ETree *tree,
               int     row,
               int     col)
{
    g_return_if_fail(tree != NULL);
    g_return_if_fail(E_IS_TREE(tree));

    if (row != -1) {
        int x, y, width, height;
        if (col == -1) {
            e_tree_get_cell_geometry (tree, row, 0, &x, &y, &width, &height);
            x = 0;
            width = GTK_WIDGET (tree->priv->table_canvas)->allocation.width;
        } else {
            e_tree_get_cell_geometry (tree, row, col, &x, &y, &width, &height);
            x += GTK_LAYOUT(tree->priv->table_canvas)->hadjustment->value;
        }
        y += GTK_LAYOUT(tree->priv->table_canvas)->vadjustment->value;

        if (tree->priv->drop_highlight == NULL) {
            tree->priv->drop_highlight =
                gnome_canvas_item_new (gnome_canvas_root (tree->priv->table_canvas),
                               gnome_canvas_rect_get_type (),
                               "fill_color", NULL,
                               /*                              "outline_color", "black",
                               "width_pixels", 1,*/
                               "outline_color_gdk", &(GTK_WIDGET (tree)->style->fg[GTK_STATE_NORMAL]),
                               NULL);
        }
        gnome_canvas_item_set (tree->priv->drop_highlight,
                       "x1", (double) x,
                       "x2", (double) x + width - 1,
                       "y1", (double) y,
                       "y2", (double) y + height - 1,
                       NULL);
    } else {
        gtk_object_destroy (GTK_OBJECT (tree->priv->drop_highlight));
        tree->priv->drop_highlight = NULL;
    }
}

void
e_tree_drag_unhighlight (ETree *tree)
{
    g_return_if_fail(tree != NULL);
    g_return_if_fail(E_IS_TREE(tree));

    if (tree->priv->drop_highlight) {
        gtk_object_destroy (GTK_OBJECT (tree->priv->drop_highlight));
        tree->priv->drop_highlight = NULL;
    }
}

void e_tree_drag_dest_set   (ETree               *tree,
                 GtkDestDefaults       flags,
                 const GtkTargetEntry *targets,
                 gint                  n_targets,
                 GdkDragAction         actions)
{
    g_return_if_fail(tree != NULL);
    g_return_if_fail(E_IS_TREE(tree));

    gtk_drag_dest_set(GTK_WIDGET(tree),
              flags,
              targets,
              n_targets,
              actions);
}

void e_tree_drag_dest_set_proxy (ETree         *tree,
                 GdkWindow      *proxy_window,
                 GdkDragProtocol protocol,
                 gboolean        use_coordinates)
{
    g_return_if_fail(tree != NULL);
    g_return_if_fail(E_IS_TREE(tree));

    gtk_drag_dest_set_proxy(GTK_WIDGET(tree),
                proxy_window,
                protocol,
                use_coordinates);
}

/*
 * There probably should be functions for setting the targets
 * as a GtkTargetList
 */

void
e_tree_drag_dest_unset (GtkWidget *widget)
{
    g_return_if_fail(widget != NULL);
    g_return_if_fail(E_IS_TREE(widget));

    gtk_drag_dest_unset(widget);
}

/* Source side */

static gint
et_real_start_drag (ETree *tree, int row, ETreePath path, int col, GdkEvent *event)
{
    GtkDragSourceInfo *info;
    GdkDragContext *context;
    ETreeDragSourceSite *site;

    if (tree->priv->do_drag) {
        site = tree->priv->site;

        site->state = 0;
        context = e_tree_drag_begin (tree, row, col,
                         site->target_list,
                         site->actions,
                         1, event);

        if (context) {
            info = g_dataset_get_data (context, "gtk-info");

            if (info && !info->icon_window) {
                if (site->pixmap)
                    gtk_drag_set_icon_pixmap (context,
                                  site->colormap,
                                  site->pixmap,
                                  site->mask, -2, -2);
                else
                    gtk_drag_set_icon_default (context);
            }
        }
        return TRUE;
    }
    return FALSE;
}

void
e_tree_drag_source_set  (ETree               *tree,
             GdkModifierType       start_button_mask,
             const GtkTargetEntry *targets,
             gint                  n_targets,
             GdkDragAction         actions)
{
    ETreeDragSourceSite *site;
    GtkWidget *canvas;

    g_return_if_fail(tree != NULL);
    g_return_if_fail(E_IS_TREE(tree));

    canvas = GTK_WIDGET(tree->priv->table_canvas);
    site = tree->priv->site;

    tree->priv->do_drag = TRUE;

    gtk_widget_add_events (canvas,
                   gtk_widget_get_events (canvas) |
                   GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK |
                   GDK_BUTTON_MOTION_MASK | GDK_STRUCTURE_MASK);

    if (site) {
        if (site->target_list)
            gtk_target_list_unref (site->target_list);
    } else {
        site = g_new0 (ETreeDragSourceSite, 1);
        tree->priv->site = site;
    }

    site->start_button_mask = start_button_mask;

    if (targets)
        site->target_list = gtk_target_list_new (targets, n_targets);
    else
        site->target_list = NULL;

    site->actions = actions;
}

void
e_tree_drag_source_unset (ETree *tree)
{
    ETreeDragSourceSite *site;

    g_return_if_fail (tree != NULL);
    g_return_if_fail (E_IS_TREE(tree));

    site = tree->priv->site;

    if (site) {
        g_free (site);
        tree->priv->site = NULL;
    }
}

/* There probably should be functions for setting the targets
 * as a GtkTargetList
 */

GdkDragContext *
e_tree_drag_begin (ETree            *tree,
           int             row,
           int             col,
           GtkTargetList     *targets,
           GdkDragAction      actions,
           gint               button,
           GdkEvent          *event)
{
    ETreePath path;
    g_return_val_if_fail (tree != NULL, NULL);
    g_return_val_if_fail (E_IS_TREE(tree), NULL);

    path = e_tree_table_adapter_node_at_row(tree->priv->etta, row);
    path = e_tree_sorted_view_to_model_path(tree->priv->sorted, path);

    tree->priv->drag_row = row;
    tree->priv->drag_path = path;
    tree->priv->drag_col = col;

    return gtk_drag_begin(GTK_WIDGET (tree->priv->table_canvas),
                  targets,
                  actions,
                  button,
                  event);
}

/**
 * e_tree_get_cell_at:
 * @tree: An ETree widget
 * @x: X coordinate for the pixel
 * @y: Y coordinate for the pixel
 * @row_return: Pointer to return the row value
 * @col_return: Pointer to return the column value
 * 
 * Return the row and column for the cell in which the pixel at (@x, @y) is
 * contained.
 **/
void
e_tree_get_cell_at (ETree *tree,
             int x, int y,
             int *row_return, int *col_return)
{
    g_return_if_fail (tree != NULL);
    g_return_if_fail (E_IS_TREE (tree));
    g_return_if_fail (row_return != NULL);
    g_return_if_fail (col_return != NULL);

    /* FIXME it would be nice if it could handle a NULL row_return or
     * col_return gracefully.  */

    if (row_return)
        *row_return = -1;
    if (col_return)
        *col_return = -1;

    x += GTK_LAYOUT(tree->priv->table_canvas)->hadjustment->value;
    y += GTK_LAYOUT(tree->priv->table_canvas)->vadjustment->value;
    e_table_item_compute_location(E_TABLE_ITEM(tree->priv->item), &x, &y, row_return, col_return);
}

/**
 * e_tree_get_cell_geometry:
 * @tree: The tree.
 * @row: The row to get the geometry of.
 * @col: The col to get the geometry of.
 * @x_return: Returns the x coordinate of the upper right hand corner of the cell with respect to the widget.
 * @y_return: Returns the y coordinate of the upper right hand corner of the cell with respect to the widget.
 * @width_return: Returns the width of the cell.
 * @height_return: Returns the height of the cell.
 * 
 * Computes the data about this cell.
 **/
void
e_tree_get_cell_geometry (ETree *tree,
              int row, int col,
              int *x_return, int *y_return,
              int *width_return, int *height_return)
{
    g_return_if_fail (tree != NULL);
    g_return_if_fail (E_IS_TREE (tree));
    g_return_if_fail (row >= 0);
    g_return_if_fail (col >= 0);

    /* FIXME it would be nice if it could handle a NULL row_return or
     * col_return gracefully.  */

    e_table_item_get_cell_geometry(E_TABLE_ITEM(tree->priv->item), &row, &col, x_return, y_return, width_return, height_return);

    if (x_return)
        (*x_return) -= GTK_LAYOUT(tree->priv->table_canvas)->hadjustment->value;
    if (y_return)
        (*y_return) -= GTK_LAYOUT(tree->priv->table_canvas)->vadjustment->value;
}

static void
et_drag_begin (GtkWidget *widget,
           GdkDragContext *context,
           ETree *et)
{
    gtk_signal_emit (GTK_OBJECT (et),
             et_signals [TREE_DRAG_BEGIN],
             et->priv->drag_row,
             et->priv->drag_path,
             et->priv->drag_col,
             context);
}

static void
et_drag_end (GtkWidget *widget,
         GdkDragContext *context,
         ETree *et)
{
    gtk_signal_emit (GTK_OBJECT (et),
             et_signals [TREE_DRAG_END],
             et->priv->drag_row,
             et->priv->drag_path,
             et->priv->drag_col,
             context);
}

static void
et_drag_data_get(GtkWidget *widget,
         GdkDragContext *context,
         GtkSelectionData *selection_data,
         guint info,
         guint time,
         ETree *et)
{
    gtk_signal_emit (GTK_OBJECT (et),
             et_signals [TREE_DRAG_DATA_GET],
             et->priv->drag_row,
             et->priv->drag_path,
             et->priv->drag_col,
             context,
             selection_data,
             info,
             time);
}

static void
et_drag_data_delete(GtkWidget *widget,
            GdkDragContext *context,
            ETree *et)
{
    gtk_signal_emit (GTK_OBJECT (et),
             et_signals [TREE_DRAG_DATA_DELETE],
             et->priv->drag_row,
             et->priv->drag_path,
             et->priv->drag_col,
             context);
}

static gboolean
do_drag_motion(ETree *et,
           GdkDragContext *context,
           gint x,
           gint y,
           guint time)
{
    gboolean ret_val = FALSE;
    int row, col;
    ETreePath path;
    GtkWidget *widget;

    widget = GTK_WIDGET (et);

    x -= widget->allocation.x;
    y -= widget->allocation.y;
    e_tree_get_cell_at (et,
                x,
                y,
                &row,
                &col);
    if (row != et->priv->drop_row && col != et->priv->drop_col) {
        gtk_signal_emit (GTK_OBJECT (et),
                 et_signals [TREE_DRAG_LEAVE],
                 et->priv->drop_row,
                 et->priv->drop_path,
                 et->priv->drop_col,
                 context,
                 time);
    }

    path = e_tree_table_adapter_node_at_row(et->priv->etta, row);
    path = e_tree_sorted_view_to_model_path(et->priv->sorted, path);

    et->priv->drop_row = row;
    et->priv->drop_path = path;
    et->priv->drop_col = col;
    gtk_signal_emit (GTK_OBJECT (et),
             et_signals [TREE_DRAG_MOTION],
             et->priv->drop_row,
             et->priv->drop_path,
             et->priv->drop_col,
             context,
             x,
             y,
             time,
             &ret_val);

    return ret_val;
}

static gboolean
scroll_timeout (gpointer data)
{
    ETree *et = data;
    int dx = 0, dy = 0;
    GtkAdjustment *v, *h;
    double vvalue, hvalue;

    if (et->priv->scroll_direction & ET_SCROLL_DOWN)
        dy += 20;
    if (et->priv->scroll_direction & ET_SCROLL_UP)
        dy -= 20;

    if (et->priv->scroll_direction & ET_SCROLL_RIGHT)
        dx += 20;
    if (et->priv->scroll_direction & ET_SCROLL_LEFT)
        dx -= 20;

    h = GTK_LAYOUT(et->priv->table_canvas)->hadjustment;
    v = GTK_LAYOUT(et->priv->table_canvas)->vadjustment;

    hvalue = h->value;
    vvalue = v->value;

    gtk_adjustment_set_value(h, CLAMP(h->value + dx, h->lower, h->upper - h->page_size));
    gtk_adjustment_set_value(v, CLAMP(v->value + dy, v->lower, v->upper - v->page_size));

    if (h->value != hvalue ||
        v->value != vvalue)
        do_drag_motion(et,
                   et->priv->last_drop_context,
                   et->priv->last_drop_x,
                   et->priv->last_drop_y,
                   et->priv->last_drop_time);
                   

    return TRUE;
}

static void
scroll_on (ETree *et, guint scroll_direction)
{
    if (et->priv->scroll_idle_id == 0 || scroll_direction != et->priv->scroll_direction) {
        if (et->priv->scroll_idle_id != 0)
            g_source_remove (et->priv->scroll_idle_id);
        et->priv->scroll_direction = scroll_direction;
        et->priv->scroll_idle_id = g_timeout_add (100, scroll_timeout, et);
    }
}

static void
scroll_off (ETree *et)
{
    if (et->priv->scroll_idle_id) {
        g_source_remove (et->priv->scroll_idle_id);
        et->priv->scroll_idle_id = 0;
    }
}

static gboolean
hover_timeout (gpointer data)
{
    ETree *et = data;
    GtkWidget *widget = data;
    int x = et->priv->hover_x;
    int y = et->priv->hover_y;
    int row, col;
    ETreePath path;

    x -= widget->allocation.x;
    y -= widget->allocation.y;
    e_tree_get_cell_at (et,
                x,
                y,
                &row,
                &col);

    path = e_tree_table_adapter_node_at_row(et->priv->etta, row);
    if (path && e_tree_model_node_is_expandable (E_TREE_MODEL (et->priv->sorted), path)) {
        if (!e_tree_table_adapter_node_is_expanded (et->priv->etta, path)) {
            if (e_tree_model_has_save_id (E_TREE_MODEL (et->priv->sorted)) && e_tree_model_has_get_node_by_id (E_TREE_MODEL (et->priv->sorted)))
                et->priv->expanded_list = g_list_prepend (et->priv->expanded_list, e_tree_model_get_save_id (E_TREE_MODEL (et->priv->sorted), path));
            e_tree_table_adapter_node_set_expanded (et->priv->etta, path, TRUE);
        }
    }

    return TRUE;
}

static void
hover_on (ETree *et, int x, int y)
{
    et->priv->hover_x = x;
    et->priv->hover_y = y;
    if (et->priv->hover_idle_id != 0)
        g_source_remove (et->priv->hover_idle_id);
    et->priv->hover_idle_id = g_timeout_add (500, hover_timeout, et);
}

static void
hover_off (ETree *et)
{
    if (et->priv->hover_idle_id) {
        g_source_remove (et->priv->hover_idle_id);
        et->priv->hover_idle_id = 0;
    }
}

static void
collapse_drag (ETree *et, ETreePath drop)
{
    GList *list;

    /* We only want to leave open parents of the node dropped in.  Not the node itself. */
    if (drop) {
        drop = e_tree_model_node_get_parent (E_TREE_MODEL (et->priv->sorted), drop);
    }

    for (list = et->priv->expanded_list; list; list = list->next) {
        char *save_id = list->data;
        ETreePath path;

        path = e_tree_model_get_node_by_id (E_TREE_MODEL (et->priv->sorted), save_id);
        if (path) {
            ETreePath search;
            gboolean found = FALSE;

            for (search = drop; search; search = e_tree_model_node_get_parent (E_TREE_MODEL (et->priv->sorted), search)) {
                if (path == search) {
                    found = TRUE;
                    break;
                }
            }

            if (!found)
                e_tree_table_adapter_node_set_expanded (et->priv->etta, path, FALSE);
        }
        g_free (save_id);
    }
    g_list_free (et->priv->expanded_list);
    et->priv->expanded_list = NULL;
}

static void
context_destroyed (gpointer data)
{
    ETree *et = data;
    if (et->priv) {
        et->priv->last_drop_x       = 0;
        et->priv->last_drop_y       = 0;
        et->priv->last_drop_time    = 0;
        et->priv->last_drop_context = NULL;
        collapse_drag (et, NULL);
        scroll_off (et);
        hover_off (et);
    }
    gtk_object_unref (GTK_OBJECT (et));
}

static void
context_connect (ETree *et, GdkDragContext *context)
{
    if (g_dataset_get_data (context, "e-tree") == NULL) {
        gtk_object_ref (GTK_OBJECT (et));
        g_dataset_set_data_full (context, "e-tree", et, context_destroyed);
    }
}

static void
et_drag_leave(GtkWidget *widget,
          GdkDragContext *context,
          guint time,
          ETree *et)
{
    gtk_signal_emit (GTK_OBJECT (et),
             et_signals [TREE_DRAG_LEAVE],
             et->priv->drop_row,
             et->priv->drop_path,
             et->priv->drop_col,
             context,
             time);
    et->priv->drop_row = -1;
    et->priv->drop_col = -1;

    scroll_off (et);
    hover_off (et);
}

static gboolean
et_drag_motion(GtkWidget *widget,
           GdkDragContext *context,
           gint x,
           gint y,
           guint time,
           ETree *et)
{
    int ret_val;
    guint direction = 0;

    et->priv->last_drop_x = x;
    et->priv->last_drop_y = y;
    et->priv->last_drop_time = time;
    et->priv->last_drop_context = context;
    context_connect (et, context);

    if (et->priv->hover_idle_id != 0) {
        if (abs (et->priv->hover_x - x) > 3 ||
            abs (et->priv->hover_y - y) > 3) {
            hover_on (et, x, y);
        }
    } else {
        hover_on (et, x, y);
    }

    ret_val = do_drag_motion (et,
                  context,
                  x,
                  y,
                  time);

    x -= widget->allocation.x;
    y -= widget->allocation.y;

    if (y < 20)
        direction |= ET_SCROLL_UP;
    if (y > widget->allocation.height - 20)
        direction |= ET_SCROLL_DOWN;
    if (x < 20)
        direction |= ET_SCROLL_LEFT;
    if (x > widget->allocation.width - 20)
        direction |= ET_SCROLL_RIGHT;

    if (direction != 0)
        scroll_on (et, direction);
    else
        scroll_off (et);

    return ret_val;
}

static gboolean
et_drag_drop(GtkWidget *widget,
         GdkDragContext *context,
         gint x,
         gint y,
         guint time,
         ETree *et)
{
    gboolean ret_val = FALSE;
    int row, col;
    ETreePath path;
    ETreePath sorted_path;
    y -= widget->allocation.y;
    x -= widget->allocation.x;
    e_tree_get_cell_at(et,
               x,
               y,
               &row,
               &col);
    sorted_path = e_tree_table_adapter_node_at_row(et->priv->etta, row);
    path = e_tree_sorted_view_to_model_path(et->priv->sorted, sorted_path);

    if (row != et->priv->drop_row && col != et->priv->drop_row) {
        gtk_signal_emit (GTK_OBJECT (et),
                 et_signals [TREE_DRAG_LEAVE],
                 et->priv->drop_row,
                 et->priv->drop_path,
                 et->priv->drop_col,
                 context,
                 time);
        gtk_signal_emit (GTK_OBJECT (et),
                 et_signals [TREE_DRAG_MOTION],
                 row,
                 path,
                 col,
                 context,
                 x,
                 y,
                 time,
                 &ret_val);
    }
    et->priv->drop_row = row;
    et->priv->drop_path = path;
    et->priv->drop_col = col;

    gtk_signal_emit (GTK_OBJECT (et),
             et_signals [TREE_DRAG_DROP],
             et->priv->drop_row,
             et->priv->drop_path,
             et->priv->drop_col,
             context,
             x,
             y,
             time,
             &ret_val);

    et->priv->drop_row = -1;
    et->priv->drop_path = NULL;
    et->priv->drop_col = -1;

    collapse_drag (et, sorted_path); 

    scroll_off (et);
    return ret_val;
}

static void
et_drag_data_received(GtkWidget *widget,
              GdkDragContext *context,
              gint x,
              gint y,
              GtkSelectionData *selection_data,
              guint info,
              guint time,
              ETree *et)
{
    int row, col;
    ETreePath path;
    y -= widget->allocation.y;
    x -= widget->allocation.x;
    e_tree_get_cell_at(et,
               x,
               y,
               &row,
               &col);
    path = e_tree_table_adapter_node_at_row(et->priv->etta, row);
    path = e_tree_sorted_view_to_model_path(et->priv->sorted, path);
    gtk_signal_emit (GTK_OBJECT (et),
             et_signals [TREE_DRAG_DATA_RECEIVED],
             row,
             path,
             col,
             context,
             x,
             y,
             selection_data,
             info,
             time);
}

static void
e_tree_class_init (ETreeClass *class)
{
    GtkObjectClass *object_class;
    GtkWidgetClass *widget_class;
    GtkContainerClass *container_class;

    object_class                   = (GtkObjectClass *) class;
    widget_class                   = (GtkWidgetClass *) class;
    container_class                = (GtkContainerClass *) class;

    parent_class                   = gtk_type_class (PARENT_TYPE);

    object_class->destroy          = et_destroy;
    object_class->set_arg          = et_set_arg;
    object_class->get_arg          = et_get_arg;

    widget_class->grab_focus       = et_grab_focus;

    container_class->focus         = et_focus;

    class->cursor_change           = NULL;
    class->cursor_activated        = NULL;
    class->selection_change        = NULL;
    class->double_click            = NULL;
    class->right_click             = NULL;
    class->click                   = NULL;
    class->key_press               = NULL;
    class->start_drag              = et_real_start_drag;

    class->tree_drag_begin         = NULL;
    class->tree_drag_end           = NULL;
    class->tree_drag_data_get      = NULL;
    class->tree_drag_data_delete   = NULL;

    class->tree_drag_leave         = NULL;
    class->tree_drag_motion        = NULL;
    class->tree_drag_drop          = NULL;
    class->tree_drag_data_received = NULL;

    et_signals [CURSOR_CHANGE] =
        gtk_signal_new ("cursor_change",
                GTK_RUN_LAST,
                E_OBJECT_CLASS_TYPE (object_class),
                GTK_SIGNAL_OFFSET (ETreeClass, cursor_change),
                gtk_marshal_NONE__INT_POINTER,
                GTK_TYPE_NONE, 2, GTK_TYPE_INT, GTK_TYPE_POINTER);

    et_signals [CURSOR_ACTIVATED] =
        gtk_signal_new ("cursor_activated",
                GTK_RUN_LAST,
                E_OBJECT_CLASS_TYPE (object_class),
                GTK_SIGNAL_OFFSET (ETreeClass, cursor_activated),
                gtk_marshal_NONE__INT_POINTER,
                GTK_TYPE_NONE, 2, GTK_TYPE_INT, GTK_TYPE_POINTER);

    et_signals [SELECTION_CHANGE] =
        gtk_signal_new ("selection_change",
                GTK_RUN_LAST,
                E_OBJECT_CLASS_TYPE (object_class),
                GTK_SIGNAL_OFFSET (ETreeClass, selection_change),
                gtk_marshal_NONE__NONE,
                GTK_TYPE_NONE, 0);

    et_signals [DOUBLE_CLICK] =
        gtk_signal_new ("double_click",
                GTK_RUN_LAST,
                E_OBJECT_CLASS_TYPE (object_class),
                GTK_SIGNAL_OFFSET (ETreeClass, double_click),
                e_marshal_NONE__INT_POINTER_INT_POINTER,
                GTK_TYPE_NONE, 4, GTK_TYPE_INT, GTK_TYPE_POINTER, GTK_TYPE_INT, GTK_TYPE_GDK_EVENT);

    et_signals [RIGHT_CLICK] =
        gtk_signal_new ("right_click",
                GTK_RUN_LAST,
                E_OBJECT_CLASS_TYPE (object_class),
                GTK_SIGNAL_OFFSET (ETreeClass, right_click),
                e_marshal_INT__INT_POINTER_INT_POINTER,
                GTK_TYPE_INT, 4, GTK_TYPE_INT, GTK_TYPE_POINTER, GTK_TYPE_INT, GTK_TYPE_GDK_EVENT);

    et_signals [CLICK] =
        gtk_signal_new ("click",
                GTK_RUN_LAST,
                E_OBJECT_CLASS_TYPE (object_class),
                GTK_SIGNAL_OFFSET (ETreeClass, click),
                e_marshal_INT__INT_POINTER_INT_POINTER,
                GTK_TYPE_INT, 4, GTK_TYPE_INT, GTK_TYPE_POINTER, GTK_TYPE_INT, GTK_TYPE_GDK_EVENT);

    et_signals [KEY_PRESS] =
        gtk_signal_new ("key_press",
                GTK_RUN_LAST,
                E_OBJECT_CLASS_TYPE (object_class),
                GTK_SIGNAL_OFFSET (ETreeClass, key_press),
                e_marshal_INT__INT_POINTER_INT_POINTER,
                GTK_TYPE_INT, 4, GTK_TYPE_INT, GTK_TYPE_POINTER, GTK_TYPE_INT, GTK_TYPE_GDK_EVENT);

    et_signals [START_DRAG] =
        gtk_signal_new ("start_drag",
                GTK_RUN_LAST,
                E_OBJECT_CLASS_TYPE (object_class),
                GTK_SIGNAL_OFFSET (ETreeClass, start_drag),
                e_marshal_NONE__INT_POINTER_INT_POINTER,
                GTK_TYPE_NONE, 4, GTK_TYPE_INT, GTK_TYPE_POINTER, GTK_TYPE_INT, GTK_TYPE_GDK_EVENT);

    et_signals[TREE_DRAG_BEGIN] =
        gtk_signal_new ("tree_drag_begin",
                GTK_RUN_LAST,
                E_OBJECT_CLASS_TYPE (object_class),
                GTK_SIGNAL_OFFSET (ETreeClass, tree_drag_begin),
                e_marshal_NONE__INT_POINTER_INT_POINTER,
                GTK_TYPE_NONE, 4,
                GTK_TYPE_INT,
                GTK_TYPE_POINTER,
                GTK_TYPE_INT,
                GTK_TYPE_GDK_DRAG_CONTEXT);
    et_signals[TREE_DRAG_END] =
        gtk_signal_new ("tree_drag_end",
                GTK_RUN_LAST,
                E_OBJECT_CLASS_TYPE (object_class),
                GTK_SIGNAL_OFFSET (ETreeClass, tree_drag_end),
                e_marshal_NONE__INT_POINTER_INT_POINTER,
                GTK_TYPE_NONE, 4,
                GTK_TYPE_INT,
                GTK_TYPE_POINTER,
                GTK_TYPE_INT,
                GTK_TYPE_GDK_DRAG_CONTEXT);
    et_signals[TREE_DRAG_DATA_GET] =
        gtk_signal_new ("tree_drag_data_get",
                GTK_RUN_LAST,
                E_OBJECT_CLASS_TYPE (object_class),
                GTK_SIGNAL_OFFSET (ETreeClass, tree_drag_data_get),
                e_marshal_NONE__INT_POINTER_INT_POINTER_POINTER_UINT_UINT,
                GTK_TYPE_NONE, 7,
                GTK_TYPE_INT,
                GTK_TYPE_POINTER,
                GTK_TYPE_INT,
                GTK_TYPE_GDK_DRAG_CONTEXT,
                GTK_TYPE_SELECTION_DATA,
                GTK_TYPE_UINT,
                GTK_TYPE_UINT);
    et_signals[TREE_DRAG_DATA_DELETE] =
        gtk_signal_new ("tree_drag_data_delete",
                GTK_RUN_LAST,
                E_OBJECT_CLASS_TYPE (object_class),
                GTK_SIGNAL_OFFSET (ETreeClass, tree_drag_data_delete),
                e_marshal_NONE__INT_POINTER_INT_POINTER,
                GTK_TYPE_NONE, 4,
                GTK_TYPE_INT,
                GTK_TYPE_POINTER,
                GTK_TYPE_INT,
                GTK_TYPE_GDK_DRAG_CONTEXT);

    et_signals[TREE_DRAG_LEAVE] =
        gtk_signal_new ("tree_drag_leave",
                GTK_RUN_LAST,
                E_OBJECT_CLASS_TYPE (object_class),
                GTK_SIGNAL_OFFSET (ETreeClass, tree_drag_leave),
                e_marshal_NONE__INT_POINTER_INT_POINTER_UINT,
                GTK_TYPE_NONE, 5,
                GTK_TYPE_INT,
                GTK_TYPE_POINTER,
                GTK_TYPE_INT,
                GTK_TYPE_GDK_DRAG_CONTEXT,
                GTK_TYPE_UINT);
    et_signals[TREE_DRAG_MOTION] =
        gtk_signal_new ("tree_drag_motion",
                GTK_RUN_LAST,
                E_OBJECT_CLASS_TYPE (object_class),
                GTK_SIGNAL_OFFSET (ETreeClass, tree_drag_motion),
                e_marshal_BOOL__INT_POINTER_INT_POINTER_INT_INT_UINT,
                GTK_TYPE_BOOL, 7,
                GTK_TYPE_INT,
                GTK_TYPE_POINTER,
                GTK_TYPE_INT,
                GTK_TYPE_GDK_DRAG_CONTEXT,
                GTK_TYPE_INT,
                GTK_TYPE_INT,
                GTK_TYPE_UINT);
    et_signals[TREE_DRAG_DROP] =
        gtk_signal_new ("tree_drag_drop",
                GTK_RUN_LAST,
                E_OBJECT_CLASS_TYPE (object_class),
                GTK_SIGNAL_OFFSET (ETreeClass, tree_drag_drop),
                e_marshal_BOOL__INT_POINTER_INT_POINTER_INT_INT_UINT,
                GTK_TYPE_BOOL, 7,
                GTK_TYPE_INT,
                GTK_TYPE_POINTER,
                GTK_TYPE_INT,
                GTK_TYPE_GDK_DRAG_CONTEXT,
                GTK_TYPE_INT,
                GTK_TYPE_INT,
                GTK_TYPE_UINT);
    et_signals[TREE_DRAG_DATA_RECEIVED] =
        gtk_signal_new ("tree_drag_data_received",
                GTK_RUN_LAST,
                E_OBJECT_CLASS_TYPE (object_class),
                GTK_SIGNAL_OFFSET (ETreeClass, tree_drag_data_received),
                e_marshal_NONE__INT_POINTER_INT_POINTER_INT_INT_POINTER_UINT_UINT,
                GTK_TYPE_NONE, 9,
                GTK_TYPE_INT,
                GTK_TYPE_POINTER,
                GTK_TYPE_INT,
                GTK_TYPE_GDK_DRAG_CONTEXT,
                GTK_TYPE_INT,
                GTK_TYPE_INT,
                GTK_TYPE_SELECTION_DATA,
                GTK_TYPE_UINT,
                GTK_TYPE_UINT);

    E_OBJECT_CLASS_ADD_SIGNALS (object_class, et_signals, LAST_SIGNAL);

    class->set_scroll_adjustments = set_scroll_adjustments;

    widget_class->set_scroll_adjustments_signal =
        gtk_signal_new ("set_scroll_adjustments",
                GTK_RUN_LAST,
                E_OBJECT_CLASS_TYPE (object_class),
                GTK_SIGNAL_OFFSET (ETreeClass, set_scroll_adjustments),
                gtk_marshal_NONE__POINTER_POINTER,
                GTK_TYPE_NONE, 2, GTK_TYPE_ADJUSTMENT, GTK_TYPE_ADJUSTMENT);

    gtk_object_add_arg_type ("ETree::length_threshold", GTK_TYPE_INT,
                 GTK_ARG_WRITABLE, ARG_LENGTH_THRESHOLD);
    gtk_object_add_arg_type ("ETree::horizontal_draw_grid", GTK_TYPE_BOOL,
                 GTK_ARG_WRITABLE, ARG_HORIZONTAL_DRAW_GRID);
    gtk_object_add_arg_type ("ETree::vertical_draw_grid", GTK_TYPE_BOOL,
                 GTK_ARG_WRITABLE, ARG_VERTICAL_DRAW_GRID);
    gtk_object_add_arg_type ("ETree::draw_focus", GTK_TYPE_BOOL,
                 GTK_ARG_WRITABLE, ARG_DRAW_FOCUS);
    gtk_object_add_arg_type ("ETree::ETreeTableAdapter", GTK_TYPE_OBJECT,
                 GTK_ARG_READABLE, ARG_ETTA);
    gtk_object_add_arg_type ("ETree::uniform_row_height", GTK_TYPE_BOOL,
                 GTK_ARG_READWRITE, ARG_UNIFORM_ROW_HEIGHT);
}

E_MAKE_TYPE(e_tree, "ETree", ETree, e_tree_class_init, e_tree_init, PARENT_TYPE);