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

/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) version 3.
 *
 * This program 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the program; if not, see <http://www.gnu.org/licenses/>
 *
 *
 * Authors:
 *      Chris Lahey <clahey@ximian.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

#include <config.h>

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include <gdk/gdkkeysyms.h>
#include <gtk/gtk.h>
#include <libgnomecanvas/gnome-canvas-rect-ellipse.h>

#include "gal-a11y-e-tree.h"
#include <glib/gi18n.h>
#include "e-util/e-util.h"
#include "misc/e-canvas.h"
#include "misc/e-canvas-utils.h"
#include "misc/e-canvas-background.h"
#include "text/e-text.h"

#include "e-table-column-specification.h"
#include "e-table-header-item.h"
#include "e-table-header.h"
#include "e-table-item.h"
#include "e-table-sort-info.h"
#include "e-table-utils.h"
#ifdef E_TREE_USE_TREE_SELECTION
#include "e-tree-selection-model.h"
#else
#include "e-table-selection-model.h"
#endif
#include "e-tree.h"
#include "e-tree-table-adapter.h"

#define COLUMN_HEADER_HEIGHT 16

#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,
    STATE_CHANGE,
    WHITE_SPACE_EVENT,

    CUT_CLIPBOARD,
    COPY_CLIPBOARD,
    PASTE_CLIPBOARD,
    SELECT_ALL,

    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 {
    PROP_0,
    PROP_LENGTH_THRESHOLD,
    PROP_HORIZONTAL_DRAW_GRID,
    PROP_VERTICAL_DRAW_GRID,
    PROP_DRAW_FOCUS,
    PROP_ETTA,
    PROP_UNIFORM_ROW_HEIGHT,
    PROP_ALWAYS_SEARCH
};

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;
    ETreeTableAdapter *etta;

    ETableHeader *full_header, *header;

    guint structure_change_id, expansion_change_id;

    ETableSortInfo *sort_info;
    ESorter   *sorter;

    guint sort_info_change_id, group_info_change_id;

    ESelectionModel *selection;
    ETableSpecification *spec;

    ETableSearch     *search;

    ETableCol        *current_search_col;

    guint     search_search_id;
    guint     search_accept_id;

    gint reflow_idle_id;
    gint scroll_idle_id;
    gint hover_idle_id;

    gint table_model_change_id;
    gint table_row_change_id;
    gint table_cell_change_id;
    gint table_rows_delete_id;

    GnomeCanvasItem *info_text;
    guint info_text_resize_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;

    guint search_col_set : 1;
    guint always_search : 1;

    ECursorMode cursor_mode;

    gint drop_row;
    ETreePath drop_path;
    gint drop_col;

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

    gint hover_x;
    gint hover_y;

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

    GList *expanded_list;
};

static guint 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 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, gint x, gint y);
static void context_destroyed (gpointer data, GObject *ctx);

G_DEFINE_TYPE (ETree, e_tree, GTK_TYPE_TABLE)

static void
et_disconnect_from_etta (ETree *et)
{
    if (et->priv->table_model_change_id != 0)
        g_signal_handler_disconnect (G_OBJECT (et->priv->etta),
                         et->priv->table_model_change_id);
    if (et->priv->table_row_change_id != 0)
        g_signal_handler_disconnect (G_OBJECT (et->priv->etta),
                         et->priv->table_row_change_id);
    if (et->priv->table_cell_change_id != 0)
        g_signal_handler_disconnect (G_OBJECT (et->priv->etta),
                         et->priv->table_cell_change_id);
    if (et->priv->table_rows_delete_id != 0)
        g_signal_handler_disconnect (G_OBJECT (et->priv->etta),
                         et->priv->table_rows_delete_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_delete_id = 0;
}

static void
clear_current_search_col (ETree *et)
{
    et->priv->search_col_set = FALSE;
}

static ETableCol *
current_search_col (ETree *et)
{
    if (!et->priv->search_col_set) {
        et->priv->current_search_col =
            e_table_util_calculate_current_search_col (et->priv->header,
                                   et->priv->full_header,
                                   et->priv->sort_info,
                                   et->priv->always_search);
        et->priv->search_col_set = TRUE;
    }

    return et->priv->current_search_col;
}

static void
e_tree_state_change (ETree *et)
{
    g_signal_emit (G_OBJECT (et), et_signals [STATE_CHANGE], 0);
}

static void
change_trigger (GtkObject *object, ETree *et)
{
    e_tree_state_change (et);
}

static void
search_col_change_trigger (GtkObject *object, ETree *et)
{
    clear_current_search_col (et);
    e_tree_state_change (et);
}

static void
disconnect_header (ETree *e_tree)
{
    if (e_tree->priv->header == NULL)
        return;

    if (e_tree->priv->structure_change_id)
        g_signal_handler_disconnect (G_OBJECT (e_tree->priv->header),
                         e_tree->priv->structure_change_id);
    if (e_tree->priv->expansion_change_id)
        g_signal_handler_disconnect (G_OBJECT (e_tree->priv->header),
                         e_tree->priv->expansion_change_id);
    if (e_tree->priv->sort_info) {
        if (e_tree->priv->sort_info_change_id)
            g_signal_handler_disconnect (G_OBJECT (e_tree->priv->sort_info),
                             e_tree->priv->sort_info_change_id);
        if (e_tree->priv->group_info_change_id)
            g_signal_handler_disconnect (G_OBJECT (e_tree->priv->sort_info),
                             e_tree->priv->group_info_change_id);

        g_object_unref(e_tree->priv->sort_info);
    }
    g_object_unref(e_tree->priv->header);
    e_tree->priv->header = NULL;
    e_tree->priv->sort_info = NULL;
}

static void
connect_header (ETree *e_tree, ETableState *state)
{
    GValue *val = g_new0 (GValue, 1);

    if (e_tree->priv->header != NULL)
        disconnect_header (e_tree);

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

    e_tree->priv->structure_change_id =
        g_signal_connect (G_OBJECT (e_tree->priv->header), "structure_change",
                  G_CALLBACK (search_col_change_trigger), e_tree);
    e_tree->priv->expansion_change_id =
        g_signal_connect (G_OBJECT (e_tree->priv->header), "expansion_change",
                  G_CALLBACK (change_trigger), e_tree);

    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);
        e_tree->priv->sort_info_change_id =
            g_signal_connect (G_OBJECT (e_tree->priv->sort_info), "sort_info_changed",
                      G_CALLBACK (search_col_change_trigger), e_tree);
        e_tree->priv->group_info_change_id =
            g_signal_connect (G_OBJECT (e_tree->priv->sort_info), "group_info_changed",
                      G_CALLBACK (search_col_change_trigger), e_tree);
    } else
        e_tree->priv->sort_info = NULL;

    g_value_init (val, G_TYPE_OBJECT);
    g_value_set_object (val, e_tree->priv->sort_info);
    g_object_set_property (G_OBJECT(e_tree->priv->header), "sort_info", val);
    g_free (val);
}

static void
et_dispose (GObject *object)
{
    ETree *et = E_TREE (object);

    if (et->priv) {

        if (et->priv->search) {
            if (et->priv->search_search_id)
                g_signal_handler_disconnect (et->priv->search,
                                 et->priv->search_search_id);
            if (et->priv->search_accept_id)
                g_signal_handler_disconnect (et->priv->search,
                                 et->priv->search_accept_id);
            g_object_unref (et->priv->search);
        }

        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);
        g_list_foreach (
            et->priv->expanded_list,
            (GFunc) g_free, NULL);
        g_list_free (et->priv->expanded_list);

        et_disconnect_from_etta (et);

        g_object_unref (et->priv->etta);
        g_object_unref (et->priv->model);
        g_object_unref (et->priv->full_header);
        disconnect_header (et);
        g_object_unref (et->priv->selection);
        if (et->priv->spec)
            g_object_unref (et->priv->spec);
        et->priv->spec = NULL;

        if (et->priv->sorter)
            g_object_unref (et->priv->sorter);
        et->priv->sorter = NULL;

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

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

        if (et->priv->last_drop_context)
            g_object_weak_unref (G_OBJECT(et->priv->last_drop_context), context_destroyed, et);
        et->priv->last_drop_context = NULL;

        if (et->priv->info_text)
            gtk_object_destroy (GTK_OBJECT (et->priv->info_text));
        et->priv->info_text = NULL;
        et->priv->info_text_resize_id = 0;

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

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

    if (G_OBJECT_CLASS (e_tree_parent_class)->dispose)
        G_OBJECT_CLASS (e_tree_parent_class)->dispose (object);
}

static void
et_unrealize (GtkWidget *widget)
{
    scroll_off (E_TREE (widget));
    hover_off (E_TREE (widget));

    if (GTK_WIDGET_CLASS (e_tree_parent_class)->unrealize)
        GTK_WIDGET_CLASS (e_tree_parent_class)->unrealize (widget);
}

typedef struct {
    ETree *et;
    gchar *string;
} SearchSearchStruct;

static gboolean
search_search_callback (ETreeModel *model, ETreePath path, gpointer data)
{
    SearchSearchStruct *cb_data = data;
    gconstpointer value;
    ETableCol *col = current_search_col (cb_data->et);

    value = e_tree_model_value_at (model, path, cb_data->et->priv->current_search_col->col_idx);

    return col->search (value, cb_data->string);
}

static gboolean
et_search_search (ETableSearch *search, gchar *string, ETableSearchFlags flags, ETree *et)
{
    ETreePath cursor;
    ETreePath found;
    SearchSearchStruct cb_data;
    ETableCol *col = current_search_col (et);

    if (col == NULL)
        return FALSE;

    cb_data.et = et;
    cb_data.string = string;

    cursor = e_tree_get_cursor (et);

    if (cursor && (flags & E_TABLE_SEARCH_FLAGS_CHECK_CURSOR_FIRST)) {
        gconstpointer value;

        value = e_tree_model_value_at (et->priv->model, cursor, col->col_idx);

        if (col->search (value, string)) {
            return TRUE;
        }
    }

    found = e_tree_model_node_find (et->priv->model, cursor, NULL, E_TREE_FIND_NEXT_FORWARD, search_search_callback, &cb_data);
    if (found == NULL)
        found = e_tree_model_node_find (et->priv->model, NULL, cursor, E_TREE_FIND_NEXT_FORWARD, search_search_callback, &cb_data);

    if (found && found != cursor) {
        gint model_row;

        e_tree_table_adapter_show_node (et->priv->etta, found);
        model_row = e_tree_table_adapter_row_of_node (et->priv->etta, found);

        e_selection_model_select_as_key_press(E_SELECTION_MODEL (et->priv->selection), model_row, col->col_idx, GDK_CONTROL_MASK);
        return TRUE;
    } else if (cursor && !(flags & E_TABLE_SEARCH_FLAGS_CHECK_CURSOR_FIRST)) {
        gconstpointer value;

        value = e_tree_model_value_at (et->priv->model, cursor, col->col_idx);

        return col->search (value, string);
    } else
        return FALSE;
}

static void
et_search_accept (ETableSearch *search, ETree *et)
{
    ETableCol *col = current_search_col (et);
    gint cursor;

    if (col == NULL)
        return;

    g_object_get(et->priv->selection,
             "cursor_row", &cursor,
             NULL);
    e_selection_model_select_as_key_press(E_SELECTION_MODEL (et->priv->selection), cursor, col->col_idx, 0);
}

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

    GTK_WIDGET_SET_FLAGS (GTK_WIDGET (e_tree), GTK_CAN_FOCUS);

    gtk_table->homogeneous               = FALSE;

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

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

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

    e_tree->priv->structure_change_id    = 0;
    e_tree->priv->expansion_change_id    = 0;
    e_tree->priv->sort_info_change_id    = 0;
    e_tree->priv->group_info_change_id   = 0;

    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->table_model_change_id  = 0;
    e_tree->priv->table_row_change_id    = 0;
    e_tree->priv->table_cell_change_id   = 0;
    e_tree->priv->table_rows_delete_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->scroll_direction       = 0;

    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->info_text              = NULL;
    e_tree->priv->info_text_resize_id    = 0;

    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;

    e_tree->priv->search                 = e_table_search_new();

    e_tree->priv->search_search_id       =
        g_signal_connect (G_OBJECT (e_tree->priv->search), "search",
                  G_CALLBACK (et_search_search), e_tree);
    e_tree->priv->search_accept_id       =
        g_signal_connect (G_OBJECT (e_tree->priv->search), "accept",
                  G_CALLBACK (et_search_accept), e_tree);

    e_tree->priv->current_search_col     = NULL;
    e_tree->priv->search_col_set         = FALSE;
    e_tree->priv->always_search          = g_getenv ("GAL_ALWAYS_SEARCH") ? TRUE : FALSE;
}

/* 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 (GtkWidget *container, GtkDirectionType direction)
{
    ETree *e_tree;

    e_tree = E_TREE (container);

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

    return gtk_widget_child_focus (GTK_WIDGET (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_size_request (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)
{
    gchar *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", (gpointer) 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);

    g_signal_connect (
        e_tree->priv->header_canvas, "size_allocate",
        G_CALLBACK (header_canvas_size_allocate), e_tree);

    gtk_widget_set_size_request (
        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 oldheight, oldwidth;
    GtkAllocation *alloc = &(GTK_WIDGET (e_tree->priv->table_canvas)->allocation);

    g_object_get (e_tree->priv->item,
              "height", &height,
              "width", &width,
              NULL);
    height = MAX ((gint)height, alloc->height);
    width = MAX((gint)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);
    }
    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;
    GtkAdjustment *adj = GTK_LAYOUT(e_tree->priv->table_canvas)->vadjustment;
    ETreePath path = e_tree_get_cursor (e_tree);
    gint x, y, w, h;
    GValue *val = g_new0 (GValue, 1);
    g_value_init (val, G_TYPE_DOUBLE);

    width = alloc->width;
    g_value_set_double (val, width);
    g_object_get (e_tree->priv->item,
              "height", &height,
              NULL);
    height = MAX ((gint)height, alloc->height);

    g_object_set (e_tree->priv->item,
              "width", width,
              NULL);
    g_object_set_property (G_OBJECT (e_tree->priv->header), "width", val);
    g_free (val);

    if (e_tree->priv->reflow_idle_id)
        g_source_remove(e_tree->priv->reflow_idle_id);
    tree_canvas_reflow_idle(e_tree);

    x = y = w = h = 0;
    if (path) {
        gint row = e_tree_row_of_node(e_tree, path);
        gint col = 0;

        if (row >= 0)
            e_table_item_get_cell_geometry (E_TABLE_ITEM (e_tree->priv->item),
                            &row, &col, &x, &y, &w, &h);
    }

    if (y < adj->value || y + h > adj->value + adj->page_size)
        gtk_adjustment_set_value(adj, CLAMP(y - adj->page_size / 2, adj->lower, adj->upper - adj->page_size));
}

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, gint row, ETree *et)
{
    ETreePath path = e_tree_table_adapter_node_at_row(et->priv->etta, row);
    g_signal_emit (et,
               et_signals [CURSOR_CHANGE], 0,
               row, path);
}

static void
item_cursor_activated (ETableItem *eti, gint row, ETree *et)
{
    ETreePath path = e_tree_table_adapter_node_at_row(et->priv->etta, row);
    g_signal_emit (et,
               et_signals [CURSOR_ACTIVATED], 0,
               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, gint row, gint col, GdkEvent *event, ETree *et)
{
    ETreePath path = e_tree_table_adapter_node_at_row(et->priv->etta, row);
    g_signal_emit (et,
               et_signals [DOUBLE_CLICK], 0,
               row, path, col, event);
}

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

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

static gint
item_key_press (ETableItem *eti, gint row, gint col, GdkEvent *event, ETree *et)
{
    gint return_val = 0;
    GdkEventKey *key = (GdkEventKey *) event;
    ETreePath path;
    gint 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 GDK_plus:
    case GDK_KP_Add:
    case GDK_Right:
    case GDK_KP_Right:
        /* Only allow if the Shift modifier is used -- eg. Ctrl-Equal shouldn't be handled.  */
        if ((key->state & (GDK_SHIFT_MASK | GDK_LOCK_MASK | GDK_MOD1_MASK)) != GDK_SHIFT_MASK)
            break;
        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 GDK_underscore:
    case GDK_KP_Subtract:
    case GDK_Left:
    case GDK_KP_Left:
        /* Only allow if the Shift modifier is used -- eg. Ctrl-Minus shouldn't be handled.  */
        if ((key->state & (GDK_SHIFT_MASK | GDK_LOCK_MASK | GDK_MOD1_MASK)) != GDK_SHIFT_MASK)
            break;
        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;
    case GDK_BackSpace:
        if (e_table_search_backspace (et->priv->search))
            return TRUE;
        /* Fallthrough */
    default:
        if ((key->state & ~(GDK_SHIFT_MASK | GDK_LOCK_MASK | GDK_MOD1_MASK | GDK_MOD2_MASK | GDK_MOD3_MASK | GDK_MOD4_MASK | GDK_MOD5_MASK)) == 0
            && ((key->keyval >= GDK_a && key->keyval <= GDK_z) ||
            (key->keyval >= GDK_A && key->keyval <= GDK_Z) ||
            (key->keyval >= GDK_0 && key->keyval <= GDK_9))) {
            e_table_search_input_character (et->priv->search, key->keyval);
        }
        path = e_tree_table_adapter_node_at_row(et->priv->etta, row);
        g_signal_emit (et,
                   et_signals [KEY_PRESS], 0,
                   row, path, col, event, &return_val);
        break;
    }
    return return_val;
}

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

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

    g_signal_emit (et,
               et_signals [START_DRAG], 0,
               row, path, col, event, &return_val);

    return return_val;
}

static void
et_selection_model_selection_changed (ETableSelectionModel *etsm, ETree *et)
{
    g_signal_emit (et,
               et_signals [SELECTION_CHANGE], 0);
}

static void
et_selection_model_selection_row_changed (ETableSelectionModel *etsm, gint row, ETree *et)
{
    g_signal_emit (et,
               et_signals [SELECTION_CHANGE], 0);
}

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);

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

static void
et_canvas_style_set (GtkWidget *widget, GtkStyle *prev_style)
{
    gnome_canvas_item_set(
        E_TREE(widget)->priv->white_item,
        "fill_color_gdk", &widget->style->base[GTK_STATE_NORMAL],
        NULL);
}

static gint
white_item_event (GnomeCanvasItem *white_item, GdkEvent *event, ETree *e_tree)
{
    gint return_val = 0;
    g_signal_emit (e_tree,
               et_signals [WHITE_SPACE_EVENT], 0,
               event, &return_val);
    return return_val;
}

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_selection_model_cursor_row (tree->priv->selection) == -1)) {
        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 ());
    g_signal_connect (
        e_tree->priv->table_canvas, "size_allocate",
        G_CALLBACK (tree_canvas_size_allocate), e_tree);
    g_signal_connect (
        e_tree->priv->table_canvas, "focus_in_event",
        G_CALLBACK (table_canvas_focus_event_cb), e_tree);
    g_signal_connect (
        e_tree->priv->table_canvas, "focus_out_event",
        G_CALLBACK (table_canvas_focus_event_cb), e_tree);

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

    g_signal_connect (e_tree->priv->table_canvas, "reflow",
              G_CALLBACK (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),
        e_canvas_background_get_type(),
        "fill_color_gdk", &GTK_WIDGET(e_tree->priv->table_canvas)->style->base[GTK_STATE_NORMAL],
        NULL);

    g_signal_connect (e_tree->priv->white_item, "event",
              G_CALLBACK (white_item_event), e_tree);
    g_signal_connect (
        gnome_canvas_root (e_tree->priv->table_canvas), "event",
        G_CALLBACK(et_canvas_root_event), e_tree);

    et_build_item(e_tree);
}

/**
 * e_tree_set_search_column:
 * @e_tree: #ETree object that will be modified
 * @col: Column index to use for searches
 *
 * This routine sets the current search column to be used for keypress
 * searches of the #ETree. If -1 is passed in for column, the current
 * search column is cleared.
 */
void
e_tree_set_search_column (ETree *e_tree, gint  col)
{
    if (col == -1) {
        clear_current_search_col (e_tree);
        return;
    }

    e_tree->priv->search_col_set = TRUE;
    e_tree->priv->current_search_col = e_table_header_get_column (e_tree->priv->full_header, col);
}

void
e_tree_set_state_object(ETree *e_tree, ETableState *state)
{
    GValue *val = g_new0 (GValue, 1);
    g_value_init (val, G_TYPE_DOUBLE);

    connect_header (e_tree, state);

    g_value_set_double (val, (double) (GTK_WIDGET(e_tree->priv->table_canvas)->allocation.width));
    g_object_set_property (G_OBJECT (e_tree->priv->header), "width", val);
    g_free (val);

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

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

    if (e_tree->priv->etta)
        e_tree_table_adapter_set_sort_info (e_tree->priv->etta, e_tree->priv->sort_info);

    e_tree_state_change (e_tree);
}

/**
 * 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);

    g_object_unref(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);

    g_object_unref(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;
    gint full_col_count;
    gint i, j;

    state = e_table_state_new();
    state->sort_info = e_tree->priv->sort_info;
    if (state->sort_info)
        g_object_ref(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);
    g_object_unref(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);
    g_object_unref(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, gint row, ETree *et)
{
    et_table_model_changed (table_model, et);
}

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

static void
et_table_rows_deleted (ETableModel *table_model, gint row, gint count, ETree *et)
{
    ETreePath * node, * prev_node;

    /* If the cursor is still valid after this deletion, we're done */
    if (e_selection_model_cursor_row (et->priv->selection) >= 0
            || row == 0)
        return;

    prev_node = e_tree_node_at_row (et, row-1);
    node = e_tree_get_cursor (et);

    /* Check if the cursor is a child of the node directly before the
     * deleted region (implying that an expander was collapsed with
     * the cursor inside it) */
    while (node) {
        node = e_tree_model_node_get_parent (et->priv->model, node);
        if (node == prev_node) {
            /* Set the cursor to the still-visible parent */
            e_tree_set_cursor (et, prev_node);
            return;
        }
    }
}

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

    et->priv->table_row_change_id = g_signal_connect (et->priv->etta, "model_row_changed",
                              G_CALLBACK (et_table_row_changed), et);

    et->priv->table_cell_change_id = g_signal_connect (et->priv->etta, "model_cell_changed",
                               G_CALLBACK (et_table_cell_changed), et);

    et->priv->table_rows_delete_id = g_signal_connect (et->priv->etta, "model_rows_deleted",
                               G_CALLBACK (et_table_rows_deleted), et);

}

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

    if (ete)
        g_object_ref(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);

    connect_header (e_tree, state);

    e_tree->priv->horizontal_scrolling = specification->horizontal_scrolling;

    e_tree->priv->model = etm;
    g_object_ref (etm);

    e_tree->priv->etta = E_TREE_TABLE_ADAPTER(e_tree_table_adapter_new(e_tree->priv->model, e_tree->priv->sort_info, e_tree->priv->full_header));

    et_connect_to_etta (e_tree);

    gtk_widget_push_colormap (gdk_rgb_get_colormap ());

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

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

    g_signal_connect(e_tree->priv->selection, "selection_changed",
             G_CALLBACK (et_selection_model_selection_changed), e_tree);
    g_signal_connect(e_tree->priv->selection, "selection_row_changed",
             G_CALLBACK (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 ();

    g_object_unref(ete);

    return e_tree != NULL;
}

/**
 * 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: %TRUE on success, %FALSE if an error occurred
 **/
gboolean
e_tree_construct (ETree *e_tree, ETreeModel *etm, ETableExtras *ete,
           const gchar *spec_str, const gchar *state_str)
{
    ETableSpecification *specification;
    ETableState *state;

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

    specification = e_table_specification_new();
    if (!e_table_specification_load_from_string(specification, spec_str)) {
        g_object_unref (specification);
        return FALSE;
    }
    if (state_str) {
        state = e_table_state_new();
        e_table_state_load_from_string(state, state_str);
        if (state->col_count <= 0) {
            g_object_unref(state);
            state = specification->state;
            g_object_ref(state);
        }
    } else {
        state = specification->state;
        g_object_ref(state);
    }

    if (!et_real_construct (e_tree, etm, ete, specification, state)) {
        g_object_unref (specification);
        g_object_unref (state);
        return FALSE;
    }

    e_tree->priv->spec = specification;

    g_object_unref (state);

    return TRUE;
}

/**
 * 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: %TRUE on success, %FALSE if an error occurred
 **/
gboolean
e_tree_construct_from_spec_file (ETree *e_tree, ETreeModel *etm, ETableExtras *ete,
                  const gchar *spec_fn, const gchar *state_fn)
{
    ETableSpecification *specification;
    ETableState *state;

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

    specification = e_table_specification_new();
    if (!e_table_specification_load_from_file(specification, spec_fn)) {
        g_object_unref(specification);
        return FALSE;
    }
    if (state_fn) {
        state = e_table_state_new();
        if (!e_table_state_load_from_file(state, state_fn)) {
            g_object_unref(state);
            state = specification->state;
            g_object_ref(state);
        }
        if (state->col_count <= 0) {
            g_object_unref(state);
            state = specification->state;
            g_object_ref(state);
        }
    } else {
        state = specification->state;
        g_object_ref(state);
    }

    if (!et_real_construct (e_tree, etm, ete, specification, state)) {
        g_object_unref (specification);
        g_object_unref (state);
        return FALSE;
    }

    e_tree->priv->spec = specification;

    g_object_unref(state);

    return TRUE;
}

/**
 * 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 gchar *spec, const gchar *state)
{
    ETree *e_tree;

    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 = g_object_new (E_TREE_TYPE, NULL);

    if (!e_tree_construct (e_tree, etm, ete, spec, state)) {
        g_object_unref (e_tree);
        return NULL;
    }

    return (GtkWidget *) e_tree;
}

/**
 * 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 gchar *spec_fn, const gchar *state_fn)
{
    ETree *e_tree;

    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 = g_object_new (E_TREE_TYPE, NULL);

    if (!e_tree_construct_from_spec_file (e_tree, etm, ete, spec_fn, state_fn)) {
        g_object_unref (e_tree);
        return NULL;
    }

    return (GtkWidget *) e_tree;
}

void
e_tree_set_cursor (ETree *e_tree, ETreePath path)
{
#ifndef E_TREE_USE_TREE_SELECTION
    gint 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
    row = e_tree_table_adapter_row_of_node(E_TREE_TABLE_ADAPTER(e_tree->priv->etta), path);

    if (row == -1)
        return;

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

ETreePath
e_tree_get_cursor (ETree *e_tree)
{
#ifdef E_TREE_USE_TREE_SELECTION
    return e_tree_selection_model_get_cursor (E_TREE_SELECTION_MODEL(e_tree->priv->selection));
#else
    gint row;
    ETreePath path;
    g_return_val_if_fail(e_tree != NULL, NULL);
    g_return_val_if_fail(E_IS_TREE(e_tree), NULL);

    g_object_get(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);
    return path;
#endif
}

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);
}

/* Standard functions */
static void
et_foreach_recurse (ETreeModel *model,
            ETreePath path,
            ETreeForeachFunc callback,
            gpointer closure)
{
    ETreePath child;

    callback(path, closure);

    child = e_tree_model_node_get_first_child(E_TREE_MODEL(model), path);
    for (; child; child = e_tree_model_node_get_next(E_TREE_MODEL(model), child))
        if (child)
            et_foreach_recurse (model, child, callback, closure);
}

void
e_tree_path_foreach (ETree *e_tree,
             ETreeForeachFunc callback,
             gpointer closure)
{
    ETreePath root;

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

    root = e_tree_model_get_root (e_tree->priv->model);

    if (root)
        et_foreach_recurse (e_tree->priv->model,
                    root,
                    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_property (GObject *object,
         guint prop_id,
         GValue *value,
         GParamSpec *pspec)
{
    ETree *etree = E_TREE (object);

    switch (prop_id) {
    case PROP_ETTA:
        g_value_set_object (value, etree->priv->etta);
        break;
    case PROP_UNIFORM_ROW_HEIGHT:
        g_value_set_boolean (value, etree->priv->uniform_row_height);
        break;
    case PROP_ALWAYS_SEARCH:
        g_value_set_boolean (value, etree->priv->always_search);
        break;
    default:
        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
        break;
    }
}

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

static void
et_set_property (GObject *object,
         guint prop_id,
         const GValue *value,
         GParamSpec *pspec)
{
    ETree *etree = E_TREE (object);

    switch (prop_id) {
    case PROP_LENGTH_THRESHOLD:
        etree->priv->length_threshold = g_value_get_int (value);
        if (etree->priv->item) {
            gnome_canvas_item_set (GNOME_CANVAS_ITEM(etree->priv->item),
                           "length_threshold", etree->priv->length_threshold,
                           NULL);
        }
        break;

    case PROP_HORIZONTAL_DRAW_GRID:
        etree->priv->horizontal_draw_grid = g_value_get_boolean (value);
        if (etree->priv->item) {
            gnome_canvas_item_set (GNOME_CANVAS_ITEM(etree->priv->item),
                           "horizontal_draw_grid", etree->priv->horizontal_draw_grid,
                           NULL);
        }
        break;

    case PROP_VERTICAL_DRAW_GRID:
        etree->priv->vertical_draw_grid = g_value_get_boolean (value);
        if (etree->priv->item) {
            gnome_canvas_item_set (GNOME_CANVAS_ITEM(etree->priv->item),
                           "vertical_draw_grid", etree->priv->vertical_draw_grid,
                           NULL);
        }
        break;

    case PROP_DRAW_FOCUS:
        etree->priv->draw_focus = g_value_get_boolean (value);
        if (etree->priv->item) {
            gnome_canvas_item_set (GNOME_CANVAS_ITEM(etree->priv->item),
                           "drawfocus", etree->priv->draw_focus,
                           NULL);
        }
        break;

    case PROP_UNIFORM_ROW_HEIGHT:
        etree->priv->uniform_row_height = g_value_get_boolean (value);
        if (etree->priv->item) {
            gnome_canvas_item_set (GNOME_CANVAS_ITEM(etree->priv->item),
                           "uniform_row_height", etree->priv->uniform_row_height,
                           NULL);
        }
        break;

    case PROP_ALWAYS_SEARCH:
        if (etree->priv->always_search == g_value_get_boolean (value))
            return;
        etree->priv->always_search = g_value_get_boolean (value);
        clear_current_search_col (etree);
        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);
    }

    if (tree->priv) {
        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) {
        gint 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) {
        gint 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)
{
    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));

    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));

    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, gint row)
{
    ETreePath path;

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

    return path;
}

gint
e_tree_row_of_node (ETree *et, ETreePath 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));

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

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

xmlDoc *
e_tree_save_expanded_state_xml (ETree *et)
{
    g_return_val_if_fail (et != NULL, NULL);
    g_return_val_if_fail (E_IS_TREE (et), NULL);

    return e_tree_table_adapter_save_expanded_state_xml (et->priv->etta);
}

void
e_tree_load_expanded_state_xml (ETree *et, xmlDoc *doc)
{
    g_return_if_fail (et != NULL);
    g_return_if_fail (E_IS_TREE (et));
    g_return_if_fail (doc != NULL);

    e_tree_table_adapter_load_expanded_state_xml (et->priv->etta, doc);
}

/* state: <0 ... collapse; 0 ... no force - use default; >0 ... expand;
   when using this, be sure to reset to 0 once no forcing is required
   anymore, aka the build of the tree is done */
void
e_tree_force_expanded_state (ETree *et, gint state)
{
    e_tree_table_adapter_force_expanded_state (et->priv->etta, state);
}

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;
}

static ETreePath
find_next_in_range (ETree *et, gint start, gint end, ETreePathFunc func, gpointer data)
{
    ETreePath path;
    gint row;

    for (row = start; row <= end; row++) {
        path = e_tree_table_adapter_node_at_row (et->priv->etta, row);
        if (path && func (et->priv->model, path, data))
            return path;
    }

    return NULL;
}

static ETreePath
find_prev_in_range (ETree *et, gint start, gint end, ETreePathFunc func, gpointer data)
{
    ETreePath path;
    gint row;

    for (row = start; row >= end; row--) {
        path = e_tree_table_adapter_node_at_row (et->priv->etta, row);
        if (path && func (et->priv->model, path, data))
            return path;
    }

    return NULL;
}

gboolean
e_tree_find_next (ETree *et, ETreeFindNextParams params, ETreePathFunc func, gpointer data)
{
    ETreePath cursor, found;
    gint row, row_count;

    cursor = e_tree_get_cursor (et);
    row = e_tree_table_adapter_row_of_node (et->priv->etta, cursor);
    row_count = e_table_model_row_count (E_TABLE_MODEL (et->priv->etta));

    if (params & E_TREE_FIND_NEXT_FORWARD)
        found = find_next_in_range (et, row + 1, row_count - 1, func, data);
    else
        found = find_prev_in_range (et, row == -1 ? -1 : row - 1, 0, func, data);

    if (found) {
        e_tree_table_adapter_show_node (et->priv->etta, found);
        e_tree_set_cursor (et, found);
        return TRUE;
    }

    if (params & E_TREE_FIND_NEXT_WRAP) {
        if (params & E_TREE_FIND_NEXT_FORWARD)
            found = find_next_in_range (et, 0, row, func, data);
        else
            found = find_prev_in_range (et, row_count - 1, row, func, data);

        if (found && found != cursor) {
            e_tree_table_adapter_show_node (et->priv->etta, found);
            e_tree_set_cursor (et, found);
            return TRUE;
        }
    }

    return FALSE;
}

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;
}

/**
 * e_tree_get_table_adapter:
 * @et: the ETree
 *
 * Returns the table adapter this ETree uses.
 *
 * Returns: the model
 **/
ETreeTableAdapter *
e_tree_get_table_adapter (ETree *et)
{
    g_return_val_if_fail (et != NULL, NULL);
    g_return_val_if_fail (E_IS_TREE (et), NULL);

    return et->priv->etta;
}

ETableItem *
e_tree_get_item(ETree * et)
{
    g_return_val_if_fail (et != NULL, NULL);
    g_return_val_if_fail (E_IS_TREE (et), NULL);

    return E_TABLE_ITEM (et->priv->item);
}

GnomeCanvasItem *
e_tree_get_header_item(ETree * et)
{
    g_return_val_if_fail (et != NULL, NULL);
    g_return_val_if_fail (E_IS_TREE (et), NULL);

    return et->priv->header_item;
}

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 */
  guint              dropped : 1;     /* Set after we receive a drop */
  guint32            proxy_drop_time; /* Timestamp for proxied drop */
  guint              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,
              gint             row,
              gint             col,
              GdkDragContext *context,
              GdkAtom         target,
              guint32         time)
{
    g_return_if_fail(tree != NULL);
    g_return_if_fail(E_IS_TREE(tree));

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

}

/**
 * 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,
               gint     row,
               gint     col)
{
    g_return_if_fail(tree != NULL);
    g_return_if_fail(E_IS_TREE(tree));

    if (row != -1) {
        gint 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, gint row, ETreePath path, gint 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) {
        if (site->target_list)
            gtk_target_list_unref (site->target_list);
        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,
           gint        row,
           gint        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);

    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,
             gint x, gint y,
             gint *row_return, gint *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,
              gint row, gint col,
              gint *x_return, gint *y_return,
              gint *width_return, gint *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)
{
    g_signal_emit (et,
               et_signals [TREE_DRAG_BEGIN], 0,
               et->priv->drag_row,
               et->priv->drag_path,
               et->priv->drag_col,
               context);
}

static void
et_drag_end (GtkWidget *widget,
         GdkDragContext *context,
         ETree *et)
{
    g_signal_emit (et,
               et_signals [TREE_DRAG_END], 0,
               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)
{
    g_signal_emit (et,
               et_signals [TREE_DRAG_DATA_GET], 0,
               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)
{
    g_signal_emit (et,
               et_signals [TREE_DRAG_DATA_DELETE], 0,
               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;
    gint row, col;
    ETreePath path;

    e_tree_get_cell_at (et,
                x,
                y,
                &row,
                &col);
    if (row != et->priv->drop_row && col != et->priv->drop_col) {
        g_signal_emit (et,
                   et_signals [TREE_DRAG_LEAVE], 0,
                   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);

    et->priv->drop_row = row;
    et->priv->drop_path = path;
    et->priv->drop_col = col;
    g_signal_emit (et,
               et_signals [TREE_DRAG_MOTION], 0,
               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;
    gint 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;
    gint x = et->priv->hover_x;
    gint y = et->priv->hover_y;
    gint row, col;
    ETreePath path;

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

    return TRUE;
}

static void
hover_on (ETree *et, gint x, gint 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 (et->priv->model, drop);
    }

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

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

            for (search = drop; search; search = e_tree_model_node_get_parent (et->priv->model, 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, GObject *ctx)
{
    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);
    }
    g_object_unref (et);
}

static void
context_connect (ETree *et, GdkDragContext *context)
{
    if (context == et->priv->last_drop_context)
        return;

    if (et->priv->last_drop_context)
        g_object_weak_unref (G_OBJECT(et->priv->last_drop_context), context_destroyed, et);
    else
        g_object_ref (et);

    g_object_weak_ref (G_OBJECT(context), context_destroyed, et);
}

static void
et_drag_leave(GtkWidget *widget,
          GdkDragContext *context,
          guint time,
          ETree *et)
{
    g_signal_emit (et,
               et_signals [TREE_DRAG_LEAVE], 0,
               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)
{
    gint ret_val;
    guint direction = 0;

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

    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;
    gint row, col;
    ETreePath path;
    e_tree_get_cell_at(et,
               x,
               y,
               &row,
               &col);
    path = e_tree_table_adapter_node_at_row(et->priv->etta, row);

    if (row != et->priv->drop_row && col != et->priv->drop_row) {
        g_signal_emit (et,
                   et_signals [TREE_DRAG_LEAVE], 0,
                   et->priv->drop_row,
                   et->priv->drop_path,
                   et->priv->drop_col,
                   context,
                   time);
        g_signal_emit (et,
                   et_signals [TREE_DRAG_MOTION], 0,
                   row,
                   path,
                   col,
                   context,
                   x,
                   y,
                   time,
                   &ret_val);
    }
    et->priv->drop_row = row;
    et->priv->drop_path = path;
    et->priv->drop_col = col;

    g_signal_emit (et,
               et_signals [TREE_DRAG_DROP], 0,
               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, 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)
{
    gint row, col;
    ETreePath path;
    e_tree_get_cell_at(et,
               x,
               y,
               &row,
               &col);
    path = e_tree_table_adapter_node_at_row(et->priv->etta, row);
    g_signal_emit (et,
               et_signals [TREE_DRAG_DATA_RECEIVED], 0,
               row,
               path,
               col,
               context,
               x,
               y,
               selection_data,
               info,
               time);
}

static void
e_tree_class_init (ETreeClass *class)
{
    GObjectClass *object_class;
    GtkWidgetClass *widget_class;

    object_class                   = (GObjectClass *) class;
    widget_class                   = (GtkWidgetClass *) class;

    object_class->dispose          = et_dispose;
    object_class->set_property     = et_set_property;
    object_class->get_property     = et_get_property;

    widget_class->grab_focus       = et_grab_focus;
    widget_class->unrealize        = et_unrealize;
    widget_class->style_set        = et_canvas_style_set;
    widget_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->state_change            = NULL;
    class->white_space_event       = NULL;

    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] =
        g_signal_new ("cursor_change",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (ETreeClass, cursor_change),
                  NULL, NULL,
                  e_marshal_NONE__INT_POINTER,
                  G_TYPE_NONE, 2, G_TYPE_INT, G_TYPE_POINTER);

    et_signals [CURSOR_ACTIVATED] =
        g_signal_new ("cursor_activated",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (ETreeClass, cursor_activated),
                  NULL, NULL,
                  e_marshal_NONE__INT_POINTER,
                  G_TYPE_NONE, 2, G_TYPE_INT, G_TYPE_POINTER);

    et_signals [SELECTION_CHANGE] =
        g_signal_new ("selection_change",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (ETreeClass, selection_change),
                  NULL, NULL,
                  g_cclosure_marshal_VOID__VOID,
                  G_TYPE_NONE, 0);

    et_signals [DOUBLE_CLICK] =
        g_signal_new ("double_click",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (ETreeClass, double_click),
                  NULL, NULL,
                  e_marshal_NONE__INT_POINTER_INT_BOXED,
                  G_TYPE_NONE, 4, G_TYPE_INT,
                  G_TYPE_POINTER, G_TYPE_INT, GDK_TYPE_EVENT);

    et_signals [RIGHT_CLICK] =
        g_signal_new ("right_click",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (ETreeClass, right_click),
                  NULL, NULL,
                  e_marshal_INT__INT_POINTER_INT_BOXED,
                  G_TYPE_INT, 4, G_TYPE_INT, G_TYPE_POINTER,
                  G_TYPE_INT, GDK_TYPE_EVENT);

    et_signals [CLICK] =
        g_signal_new ("click",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (ETreeClass, click),
                  NULL, NULL,
                  e_marshal_INT__INT_POINTER_INT_BOXED,
                  G_TYPE_INT, 4, G_TYPE_INT, G_TYPE_POINTER,
                  G_TYPE_INT, GDK_TYPE_EVENT);

    et_signals [KEY_PRESS] =
        g_signal_new ("key_press",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (ETreeClass, key_press),
                  NULL, NULL,
                  e_marshal_INT__INT_POINTER_INT_BOXED,
                  G_TYPE_INT, 4, G_TYPE_INT, G_TYPE_POINTER,
                  G_TYPE_INT, GDK_TYPE_EVENT);

    et_signals [START_DRAG] =
        g_signal_new ("start_drag",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (ETreeClass, start_drag),
                  NULL, NULL,
                  e_marshal_NONE__INT_POINTER_INT_BOXED,
                  G_TYPE_NONE, 4, G_TYPE_INT, G_TYPE_POINTER,
                  G_TYPE_INT, GDK_TYPE_EVENT);

    et_signals [STATE_CHANGE] =
        g_signal_new ("state_change",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (ETreeClass, state_change),
                  NULL, NULL,
                  g_cclosure_marshal_VOID__VOID,
                  G_TYPE_NONE, 0);

    et_signals [WHITE_SPACE_EVENT] =
        g_signal_new ("white_space_event",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (ETreeClass, white_space_event),
                  NULL, NULL,
                  e_marshal_INT__POINTER,
                  G_TYPE_INT, 1, GDK_TYPE_EVENT);

    et_signals[TREE_DRAG_BEGIN] =
        g_signal_new ("tree_drag_begin",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (ETreeClass, tree_drag_begin),
                  NULL, NULL,
                  e_marshal_NONE__INT_POINTER_INT_BOXED,
                  G_TYPE_NONE, 4,
                  G_TYPE_INT,
                  G_TYPE_POINTER,
                  G_TYPE_INT,
                  GDK_TYPE_DRAG_CONTEXT);
    et_signals[TREE_DRAG_END] =
        g_signal_new ("tree_drag_end",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (ETreeClass, tree_drag_end),
                  NULL, NULL,
                  e_marshal_NONE__INT_POINTER_INT_BOXED,
                  G_TYPE_NONE, 4,
                  G_TYPE_INT,
                  G_TYPE_POINTER,
                  G_TYPE_INT,
                  GDK_TYPE_DRAG_CONTEXT);
    et_signals[TREE_DRAG_DATA_GET] =
        g_signal_new ("tree_drag_data_get",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (ETreeClass, tree_drag_data_get),
                  NULL, NULL,
                  e_marshal_NONE__INT_POINTER_INT_OBJECT_BOXED_UINT_UINT,
                  G_TYPE_NONE, 7,
                  G_TYPE_INT,
                  G_TYPE_POINTER,
                  G_TYPE_INT,
                  GDK_TYPE_DRAG_CONTEXT,
                  GTK_TYPE_SELECTION_DATA | G_SIGNAL_TYPE_STATIC_SCOPE,
                  G_TYPE_UINT,
                  G_TYPE_UINT);
    et_signals[TREE_DRAG_DATA_DELETE] =
        g_signal_new ("tree_drag_data_delete",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (ETreeClass, tree_drag_data_delete),
                  NULL, NULL,
                  e_marshal_NONE__INT_POINTER_INT_OBJECT,
                  G_TYPE_NONE, 4,
                  G_TYPE_INT,
                  G_TYPE_POINTER,
                  G_TYPE_INT,
                  GDK_TYPE_DRAG_CONTEXT);

    et_signals[TREE_DRAG_LEAVE] =
        g_signal_new ("tree_drag_leave",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (ETreeClass, tree_drag_leave),
                  NULL, NULL,
                  e_marshal_NONE__INT_POINTER_INT_OBJECT_UINT,
                  G_TYPE_NONE, 5,
                  G_TYPE_INT,
                  G_TYPE_POINTER,
                  G_TYPE_INT,
                  GDK_TYPE_DRAG_CONTEXT,
                  G_TYPE_UINT);
    et_signals[TREE_DRAG_MOTION] =
        g_signal_new ("tree_drag_motion",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (ETreeClass, tree_drag_motion),
                  NULL, NULL,
                  e_marshal_BOOLEAN__INT_POINTER_INT_OBJECT_INT_INT_UINT,
                  G_TYPE_BOOLEAN, 7,
                  G_TYPE_INT,
                  G_TYPE_POINTER,
                  G_TYPE_INT,
                  GDK_TYPE_DRAG_CONTEXT,
                  G_TYPE_INT,
                  G_TYPE_INT,
                  G_TYPE_UINT);
    et_signals[TREE_DRAG_DROP] =
        g_signal_new ("tree_drag_drop",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (ETreeClass, tree_drag_drop),
                  NULL, NULL,
                  e_marshal_BOOLEAN__INT_POINTER_INT_OBJECT_INT_INT_UINT,
                  G_TYPE_BOOLEAN, 7,
                  G_TYPE_INT,
                  G_TYPE_POINTER,
                  G_TYPE_INT,
                  GDK_TYPE_DRAG_CONTEXT,
                  G_TYPE_INT,
                  G_TYPE_INT,
                  G_TYPE_UINT);
    et_signals[TREE_DRAG_DATA_RECEIVED] =
        g_signal_new ("tree_drag_data_received",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (ETreeClass, tree_drag_data_received),
                  NULL, NULL,
                  e_marshal_NONE__INT_POINTER_INT_OBJECT_INT_INT_BOXED_UINT_UINT,
                  G_TYPE_NONE, 9,
                  G_TYPE_INT,
                  G_TYPE_POINTER,
                  G_TYPE_INT,
                  GDK_TYPE_DRAG_CONTEXT,
                  G_TYPE_INT,
                  G_TYPE_INT,
                  GTK_TYPE_SELECTION_DATA,
                  G_TYPE_UINT,
                  G_TYPE_UINT);

    class->set_scroll_adjustments = set_scroll_adjustments;

    widget_class->set_scroll_adjustments_signal =
        g_signal_new ("set_scroll_adjustments",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (ETreeClass, set_scroll_adjustments),
                  NULL, NULL,
                  e_marshal_NONE__OBJECT_OBJECT,
                  G_TYPE_NONE, 2, GTK_TYPE_ADJUSTMENT,
                  GTK_TYPE_ADJUSTMENT);

    g_object_class_install_property (object_class, PROP_LENGTH_THRESHOLD,
                     g_param_spec_int ("length_threshold",
                               _( "Length Threshold" ),
                               _( "Length Threshold" ),
                               0, G_MAXINT, 0,
                               G_PARAM_WRITABLE));
    g_object_class_install_property (object_class, PROP_HORIZONTAL_DRAW_GRID,
                     g_param_spec_boolean ("horizontal_draw_grid",
                                   _( "Horizontal Draw Grid" ),
                                   _( "Horizontal Draw Grid" ),
                                   FALSE,
                                   G_PARAM_WRITABLE));
    g_object_class_install_property (object_class, PROP_VERTICAL_DRAW_GRID,
                     g_param_spec_boolean ("vertical_draw_grid",
                                   _( "Vertical Draw Grid" ),
                                   _( "Vertical Draw Grid" ),
                                   FALSE,
                                   G_PARAM_WRITABLE));
    g_object_class_install_property (object_class, PROP_DRAW_FOCUS,
                     g_param_spec_boolean ("drawfocus",
                                   _( "Draw focus" ),
                                   _( "Draw focus" ),
                                   FALSE,
                                   G_PARAM_WRITABLE));

    g_object_class_install_property (object_class, PROP_ETTA,
                     g_param_spec_object ("ETreeTableAdapter",
                                  _( "ETree table adapter" ),
                                  _( "ETree table adapter" ),
                                  E_TREE_TABLE_ADAPTER_TYPE,
                                  G_PARAM_READABLE));

    g_object_class_install_property (object_class, PROP_UNIFORM_ROW_HEIGHT,
                     g_param_spec_boolean ("uniform_row_height",
                                   _( "Uniform row height" ),
                                   _( "Uniform row height" ),
                                   FALSE,
                                   G_PARAM_READWRITE));

    g_object_class_install_property (object_class, PROP_ALWAYS_SEARCH,
                     g_param_spec_boolean ("always_search",
                                   _( "Always search" ),
                                   _( "Always search" ),
                                   FALSE,
                                   G_PARAM_READWRITE));

    gtk_widget_class_install_style_property (widget_class,
               g_param_spec_boolean ("retro_look",
                         _("Retro Look"),
                         _("Draw lines and +/- expanders."),
                         FALSE,
                         G_PARAM_READABLE));

    gtk_widget_class_install_style_property (widget_class,
               g_param_spec_int ("expander_size",
                         _("Expander Size"),
                         _("Size of the expander arrow"),
                         0,
                         G_MAXINT,
                         10,
                         G_PARAM_READABLE));

    gal_a11y_e_tree_init ();
}

static void
tree_size_allocate (GtkWidget *widget, GtkAllocation *alloc, ETree *tree)
{
    double width;

    g_return_if_fail (tree != NULL);
    g_return_if_fail (tree->priv != NULL);
    g_return_if_fail (tree->priv->info_text != NULL);

    gnome_canvas_get_scroll_region (GNOME_CANVAS (tree->priv->table_canvas), NULL, NULL, &width, NULL);

    width -= 60.0;

    g_object_set (tree->priv->info_text, "width", width, "clip_width", width, NULL);
}

/**
 * e_tree_set_info_message:
 * @tree: #ETree instance
 * @info_message: Message to set. Can be NULL.
 *
 * Creates an info message in table area, or removes old.
 **/
void
e_tree_set_info_message (ETree *tree, const gchar *info_message)
{
    g_return_if_fail (tree != NULL);
    g_return_if_fail (tree->priv != NULL);

    if (!tree->priv->info_text && (!info_message || !*info_message))
        return;

    if (!info_message || !*info_message) {
        g_signal_handler_disconnect (tree, tree->priv->info_text_resize_id);
        gtk_object_destroy (GTK_OBJECT (tree->priv->info_text));
        tree->priv->info_text = NULL;
        return;
    }

    if (!tree->priv->info_text) {
        tree->priv->info_text = gnome_canvas_item_new (GNOME_CANVAS_GROUP (gnome_canvas_root (tree->priv->table_canvas)),
                        e_text_get_type (),
                        "anchor", GTK_ANCHOR_NW,
                        "line_wrap", TRUE,
                        "clip", TRUE,
                        "justification", GTK_JUSTIFY_LEFT,
                        "text", info_message,
                        "draw_background", FALSE,
                        "width", (double) GTK_WIDGET (tree->priv->table_canvas)->allocation.width - 60.0,
                        "clip_width", (double) GTK_WIDGET (tree->priv->table_canvas)->allocation.width - 60.0,
                        NULL);

        e_canvas_item_move_absolute (tree->priv->info_text, 30, 30);

        tree->priv->info_text_resize_id = g_signal_connect (tree, "size_allocate", G_CALLBACK (tree_size_allocate), tree);
    } else
        gnome_canvas_item_set (tree->priv->info_text, "text", info_message, NULL);
}