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

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 * E-table.c: A graphical view of a Table.
 *
 * Author:
 *   Miguel de Icaza (miguel@ximian.com)
 *   Chris Lahey <clahey@ximian.com>
 *
 * Copyright 1999, 2000, 2001, Ximian, Inc
 */
#include <config.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdio.h>
#include "gal/util/e-i18n.h"
#include <libgnomeui/gnome-canvas.h>
#include <gtk/gtksignal.h>

#include "gal/util/e-util.h"
#include "gal/widgets/e-canvas.h"
#include "gal/widgets/e-canvas-vbox.h"
#include "e-table.h"
#include "e-table-header-item.h"
#include "e-table-header-utils.h"
#include "e-table-subset.h"
#include "e-table-item.h"
#include "e-table-group.h"
#include "e-table-group-leaf.h"
#include "e-table-click-to-add.h"
#include "e-table-specification.h"
#include "e-table-state.h"
#include "e-table-column-specification.h"

#include "e-table-utils.h"

#define COLUMN_HEADER_HEIGHT 16

#define PARENT_TYPE gtk_table_get_type ()

static GtkObjectClass *e_table_parent_class;

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

    TABLE_DRAG_BEGIN,
    TABLE_DRAG_END,
    TABLE_DRAG_DATA_GET,
    TABLE_DRAG_DATA_DELETE,

    TABLE_DRAG_LEAVE,
    TABLE_DRAG_MOTION,
    TABLE_DRAG_DROP,
    TABLE_DRAG_DATA_RECEIVED,

    LAST_SIGNAL
};

enum {
    ARG_0,
    ARG_LENGTH_THRESHOLD,
};

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

static void e_table_fill_table (ETable *e_table, ETableModel *model);
static gboolean changed_idle (gpointer data);

static void et_grab_focus (GtkWidget *widget);

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

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

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

static void
et_disconnect_model (ETable *et)
{
    if (et->model == NULL)
        return;

    if (et->table_model_change_id != 0)
        gtk_signal_disconnect (GTK_OBJECT (et->model),
                       et->table_model_change_id);
    if (et->table_row_change_id != 0)
        gtk_signal_disconnect (GTK_OBJECT (et->model),
                       et->table_row_change_id);
    if (et->table_cell_change_id != 0)
        gtk_signal_disconnect (GTK_OBJECT (et->model),
                       et->table_cell_change_id);
    if (et->table_rows_inserted_id != 0)
        gtk_signal_disconnect (GTK_OBJECT (et->model),
                       et->table_rows_inserted_id);
    if (et->table_rows_deleted_id != 0)
        gtk_signal_disconnect (GTK_OBJECT (et->model),
                       et->table_rows_deleted_id);

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

static void
et_destroy (GtkObject *object)
{
    ETable *et = E_TABLE (object);

    et_disconnect_model (et);

    if (et->group_info_change_id)
        gtk_signal_disconnect (GTK_OBJECT (et->sort_info),
                       et->group_info_change_id);

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

    gtk_object_unref (GTK_OBJECT (et->model));
    gtk_object_unref (GTK_OBJECT (et->full_header));
    gtk_object_unref (GTK_OBJECT (et->header));
    gtk_object_unref (GTK_OBJECT (et->sort_info));
    gtk_object_unref (GTK_OBJECT (et->sorter));
    gtk_object_unref (GTK_OBJECT (et->selection));
    if (et->spec)
        gtk_object_unref (GTK_OBJECT (et->spec));

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

    gtk_widget_destroy (GTK_WIDGET (et->table_canvas));

    if (et->rebuild_idle_id) {
        g_source_remove (et->rebuild_idle_id);
        et->rebuild_idle_id = 0;
    }

    g_free(et->click_to_add_message);

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

static void
e_table_init (GtkObject *object)
{
    ETable *e_table = E_TABLE (object);
    GtkTable *gtk_table = GTK_TABLE (object);

    GTK_WIDGET_SET_FLAGS (e_table, GTK_CAN_FOCUS);

    gtk_table->homogeneous = FALSE;

    e_table->sort_info = NULL;
    e_table->group_info_change_id = 0;
    e_table->reflow_idle_id = 0;

    e_table->horizontal_draw_grid = 1;
    e_table->vertical_draw_grid = 1;
    e_table->draw_focus = 1;
    e_table->cursor_mode = E_CURSOR_SIMPLE;
    e_table->length_threshold = 200;

    e_table->need_rebuild = 0;
    e_table->rebuild_idle_id = 0;

    e_table->horizontal_scrolling = FALSE;

    e_table->click_to_add_message = NULL;

    e_table->drag_get_data_row = -1;
    e_table->drag_get_data_col = -1;
    e_table->drop_row = -1;
    e_table->drop_col = -1;
    e_table->site = NULL;
    e_table->drag_source_button_press_event_id = 0;
    e_table->drag_source_motion_notify_event_id = 0;

    e_table->sorter = NULL;
    e_table->selection = e_table_selection_model_new();
    e_table->cursor_loc = E_TABLE_CURSOR_LOC_NONE;
    e_table->spec = NULL;
}

/* Grab_focus handler for the ETable */
static void
et_grab_focus (GtkWidget *widget)
{
    ETable *e_table;

    e_table = E_TABLE (widget);

    gtk_widget_grab_focus (GTK_WIDGET (e_table->table_canvas));
}

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

    e_table = E_TABLE (container);

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

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

static void
set_header_canvas_width (ETable *e_table)
{
    double oldwidth, oldheight, width;

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

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

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

}

static void
header_canvas_size_allocate (GtkWidget *widget, GtkAllocation *alloc, ETable *e_table)
{
    set_header_canvas_width (e_table);

    /* 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_table->header_canvas)->allocation.height !=
        E_TABLE_HEADER_ITEM (e_table->header_item)->height)
        gtk_widget_set_usize (GTK_WIDGET (e_table->header_canvas), -1,
                      E_TABLE_HEADER_ITEM (e_table->header_item)->height);
}

static void
sort_info_changed (ETableSortInfo *info, ETable *et)
{
    gboolean will_be_grouped = e_table_sort_info_grouping_get_count(info) > 0;
    if (et->is_grouped || will_be_grouped) {
        et->need_rebuild = TRUE;
        if (!et->rebuild_idle_id)
            et->rebuild_idle_id = g_idle_add_full (20, changed_idle, et, NULL);
    }
}

static void
e_table_setup_header (ETable *e_table)
{
    char *pointer;
    e_table->header_canvas = GNOME_CANVAS (e_canvas_new ());
    GTK_WIDGET_UNSET_FLAGS (e_table->header_canvas, GTK_CAN_FOCUS);

    gtk_widget_show (GTK_WIDGET (e_table->header_canvas));

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

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

    g_free(pointer);

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

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

static gboolean
table_canvas_reflow_idle (ETable *e_table)
{
    gdouble height, width;
    gdouble item_height;
    gdouble oldheight, oldwidth;
    GtkAllocation *alloc = &(GTK_WIDGET (e_table->table_canvas)->allocation);

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

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

static void
table_canvas_size_allocate (GtkWidget *widget, GtkAllocation *alloc,
                ETable *e_table)
{
    gdouble width;
    gdouble height;
    gdouble item_height;

    width = alloc->width;
    gtk_object_get (GTK_OBJECT (e_table->canvas_vbox),
            "height", &height,
            NULL);
    item_height = height;
    height = MAX ((int)height, alloc->height);

    gtk_object_set (GTK_OBJECT (e_table->canvas_vbox),
            "width", width,
            NULL);
    gtk_object_set (GTK_OBJECT (e_table->header),
            "width", width,
            NULL);
    gtk_object_set (GTK_OBJECT (e_table->white_item),
            "y1", item_height + 1,
            "x2", width,
            "y2", height,
            NULL);
    if (e_table->reflow_idle_id)
        g_source_remove(e_table->reflow_idle_id);
    table_canvas_reflow_idle(e_table);
}

static void
table_canvas_reflow (GnomeCanvas *canvas, ETable *e_table)
{
    if (!e_table->reflow_idle_id)
        e_table->reflow_idle_id = g_idle_add_full (400, (GSourceFunc) table_canvas_reflow_idle, e_table, NULL);
}

static void
click_to_add_cursor_change (ETableClickToAdd *etcta, int row, int col, ETable *et)
{
    if (et->cursor_loc == E_TABLE_CURSOR_LOC_TABLE) {
        e_selection_model_clear(E_SELECTION_MODEL (et->selection));
    }
    et->cursor_loc = E_TABLE_CURSOR_LOC_ETCTA;
}

static void
group_cursor_change (ETableGroup *etg, int row, ETable *et)
{
    if (et->cursor_loc == E_TABLE_CURSOR_LOC_ETCTA && et->click_to_add) {
        e_table_click_to_add_commit(E_TABLE_CLICK_TO_ADD(et->click_to_add));
    }
    et->cursor_loc = E_TABLE_CURSOR_LOC_TABLE;
    gtk_signal_emit (GTK_OBJECT (et),
             et_signals [CURSOR_CHANGE],
             row);
}

static void
group_cursor_activated (ETableGroup *etg, int row, ETable *et)
{
    gtk_signal_emit (GTK_OBJECT (et),
             et_signals [CURSOR_ACTIVATED],
             row);
}

static void
group_double_click (ETableGroup *etg, int row, int col, GdkEvent *event, ETable *et)
{
    gtk_signal_emit (GTK_OBJECT (et),
             et_signals [DOUBLE_CLICK],
             row, col, event);
}

static gint
group_right_click (ETableGroup *etg, int row, int col, GdkEvent *event, ETable *et)
{
    int return_val = 0;
    gtk_signal_emit (GTK_OBJECT (et),
             et_signals [RIGHT_CLICK],
             row, col, event, &return_val);
    return return_val;
}

static gint
group_click (ETableGroup *etg, int row, int col, GdkEvent *event, ETable *et)
{
    int return_val = 0;
    gtk_signal_emit (GTK_OBJECT (et),
             et_signals [CLICK],
             row, col, event, &return_val);
    return return_val;
}

static gint
group_key_press (ETableGroup *etg, int row, int col, GdkEvent *event, ETable *et)
{
    int return_val = 0;
    GdkEventKey *key = (GdkEventKey *) event;
    GdkEventButton click;
    switch (key->keyval) {
    case GDK_Page_Down:
        gtk_adjustment_set_value(
            gtk_layout_get_vadjustment (GTK_LAYOUT (et->table_canvas)),
            CLAMP(gtk_layout_get_vadjustment (GTK_LAYOUT (et->table_canvas))->value +
                  (gtk_layout_get_vadjustment (GTK_LAYOUT (et->table_canvas))->page_size - 20),
                  0,
                  gtk_layout_get_vadjustment (GTK_LAYOUT (et->table_canvas))->upper -
                  gtk_layout_get_vadjustment (GTK_LAYOUT (et->table_canvas))->page_size));
        click.type = GDK_BUTTON_PRESS;
        click.window = GTK_LAYOUT (et->table_canvas)->bin_window;
        click.send_event = key->send_event;
        click.time = key->time;
        click.x = 30;
        click.y = gtk_layout_get_vadjustment (GTK_LAYOUT (et->table_canvas))->page_size - 1;
        click.state = key->state;
        click.button = 1;
        gtk_widget_event(GTK_WIDGET(et->table_canvas),
                 (GdkEvent *) &click);
        return_val = 1;
        break;
    case GDK_Page_Up:
        gtk_adjustment_set_value(
            gtk_layout_get_vadjustment (GTK_LAYOUT (et->table_canvas)),
            gtk_layout_get_vadjustment (GTK_LAYOUT (et->table_canvas))->value -
            (gtk_layout_get_vadjustment (GTK_LAYOUT (et->table_canvas))->page_size - 20));
        click.type = GDK_BUTTON_PRESS;
        click.window = GTK_LAYOUT (et->table_canvas)->bin_window;
        click.send_event = key->send_event;
        click.time = key->time;
        click.x = 30;
        click.y = 1;
        click.state = key->state;
        click.button = 1;
        gtk_widget_event(GTK_WIDGET(et->table_canvas),
                 (GdkEvent *) &click);
        return_val = 1;
        break;
    default:
        gtk_signal_emit (GTK_OBJECT (et),
                 et_signals [KEY_PRESS],
                 row, col, event, &return_val);
        break;
    }
    return return_val;
}

static void
et_table_model_changed (ETableModel *model, ETable *et)
{
    et->need_rebuild = TRUE;
    if (!et->rebuild_idle_id)
        et->rebuild_idle_id = g_idle_add_full (20, changed_idle, et, NULL);
}

static void
et_table_row_changed (ETableModel *table_model, int row, ETable *et)
{
    if (!et->need_rebuild) {
        if (e_table_group_remove (et->group, row))
            e_table_group_add (et->group, row);
        if (et->horizontal_scrolling)
            e_table_header_update_horizontal(et->header);
    }
}

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

static void
et_table_rows_inserted (ETableModel *table_model, int row, int count, ETable *et)
{
    /* This number has already been decremented. */
    int row_count = e_table_model_row_count(table_model);
    if (!et->need_rebuild) {
        int i;
        if (row != row_count - count)
            e_table_group_increment(et->group, row, count);
        for (i = 0; i < count; i++)
            e_table_group_add (et->group, row);
        if (et->horizontal_scrolling)
            e_table_header_update_horizontal(et->header);
    }
}

static void
et_table_rows_deleted (ETableModel *table_model, int row, int count, ETable *et)
{
    int row_count = e_table_model_row_count(table_model);
    if (!et->need_rebuild) {
        int i;
        for (i = 0; i < count; i++)
            e_table_group_remove (et->group, row);
        if (row != row_count)
            e_table_group_decrement(et->group, row, count);
        if (et->horizontal_scrolling)
            e_table_header_update_horizontal(et->header);
    }
}

static void
et_build_groups (ETable *et)
{
    gboolean was_grouped = et->is_grouped;

    et->is_grouped = e_table_sort_info_grouping_get_count(et->sort_info) > 0;

    et->group = e_table_group_new (GNOME_CANVAS_GROUP (et->canvas_vbox),
                       et->full_header,
                       et->header,
                       et->model,
                       et->sort_info,
                       0);
    e_canvas_vbox_add_item(E_CANVAS_VBOX(et->canvas_vbox), GNOME_CANVAS_ITEM(et->group));
    gnome_canvas_item_set(GNOME_CANVAS_ITEM(et->group),
                  "horizontal_draw_grid", et->horizontal_draw_grid,
                  "vertical_draw_grid", et->vertical_draw_grid,
                  "drawfocus", et->draw_focus,
                  "cursor_mode", et->cursor_mode,
                  "length_threshold", et->length_threshold,
                  "selection_model", et->selection,
                  NULL);

    gtk_signal_connect (GTK_OBJECT (et->group), "cursor_change",
                GTK_SIGNAL_FUNC (group_cursor_change), et);
    gtk_signal_connect (GTK_OBJECT (et->group), "cursor_activated",
                GTK_SIGNAL_FUNC (group_cursor_activated), et);
    gtk_signal_connect (GTK_OBJECT (et->group), "double_click",
                GTK_SIGNAL_FUNC (group_double_click), et);
    gtk_signal_connect (GTK_OBJECT (et->group), "right_click",
                GTK_SIGNAL_FUNC (group_right_click), et);
    gtk_signal_connect (GTK_OBJECT (et->group), "click",
                GTK_SIGNAL_FUNC (group_click), et);
    gtk_signal_connect (GTK_OBJECT (et->group), "key_press",
                GTK_SIGNAL_FUNC (group_key_press), et);


    if (!(et->is_grouped) && was_grouped)
        et_disconnect_model (et);

    if (et->is_grouped && (!was_grouped)) {
        et->table_model_change_id = gtk_signal_connect (GTK_OBJECT (et->model), "model_changed",
                                GTK_SIGNAL_FUNC (et_table_model_changed), et);

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

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

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

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

    }

    if (et->is_grouped)
        e_table_fill_table (et, et->model);
}

static gboolean
changed_idle (gpointer data)
{
    ETable *et = E_TABLE (data);

    if (et->need_rebuild) {
        gtk_object_destroy (GTK_OBJECT (et->group));
        et_build_groups(et);
        gtk_object_set (GTK_OBJECT (et->canvas_vbox),
                "width", (double) GTK_WIDGET (et->table_canvas)->allocation.width,
                NULL);

        if (GTK_WIDGET_REALIZED(et->table_canvas))
            table_canvas_size_allocate (GTK_WIDGET(et->table_canvas), &GTK_WIDGET(et->table_canvas)->allocation, et);
    }

    et->need_rebuild = 0;
    et->rebuild_idle_id = 0;

    if (et->horizontal_scrolling)
        e_table_header_update_horizontal(et->header);

    return FALSE;
}

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

static void
et_canvas_button_press (GtkWidget *canvas, GdkEvent *event, ETable *e_table)
{
    if (GTK_WIDGET_HAS_FOCUS(canvas)) {
        GnomeCanvasItem *item = GNOME_CANVAS(canvas)->focused_item;

        if (E_IS_TABLE_ITEM(item)) {
            e_table_item_leave_edit(E_TABLE_ITEM(item));
        }
    }
}

static void
e_table_setup_table (ETable *e_table, ETableHeader *full_header, ETableHeader *header,
             ETableModel *model)
{
    e_table->table_canvas = GNOME_CANVAS (e_canvas_new ());
    gtk_signal_connect (
        GTK_OBJECT (e_table->table_canvas), "size_allocate",
        GTK_SIGNAL_FUNC (table_canvas_size_allocate), e_table);
    gtk_signal_connect (
        GTK_OBJECT (e_table->table_canvas), "focus_in_event",
        GTK_SIGNAL_FUNC (gtk_widget_queue_draw), e_table);
    gtk_signal_connect (
        GTK_OBJECT (e_table->table_canvas), "focus_out_event",
        GTK_SIGNAL_FUNC (gtk_widget_queue_draw), e_table);

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

    gtk_signal_connect (GTK_OBJECT(e_table->table_canvas), "reflow",
                GTK_SIGNAL_FUNC (table_canvas_reflow), e_table);

    gtk_widget_show (GTK_WIDGET (e_table->table_canvas));


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

    gtk_signal_connect (
        GTK_OBJECT(e_table->table_canvas), "realize",
        GTK_SIGNAL_FUNC(et_canvas_realize), e_table);
    gtk_signal_connect (
        GTK_OBJECT(e_table->table_canvas), "button_press_event",
        GTK_SIGNAL_FUNC(et_canvas_button_press), e_table);
    e_table->canvas_vbox = gnome_canvas_item_new(
        gnome_canvas_root(e_table->table_canvas),
        e_canvas_vbox_get_type(),
        "spacing", 10.0,
        NULL);

    if (e_table->use_click_to_add) {
        e_table->click_to_add = gnome_canvas_item_new (
            GNOME_CANVAS_GROUP(e_table->canvas_vbox),
            e_table_click_to_add_get_type (),
            "header", e_table->header,
            "model", e_table->model,
            "message", e_table->click_to_add_message,
            NULL);

        e_canvas_vbox_add_item (
            E_CANVAS_VBOX(e_table->canvas_vbox),
            e_table->click_to_add);
        gtk_signal_connect (
            GTK_OBJECT (e_table->click_to_add), "cursor_change",
            GTK_SIGNAL_FUNC(click_to_add_cursor_change), e_table);
    }

    et_build_groups(e_table);
}

static void
e_table_fill_table (ETable *e_table, ETableModel *model)
{
    e_table_group_add_all (e_table->group);
}

void
e_table_set_state_object(ETable *e_table, ETableState *state)
{
    if (e_table->header)
        gtk_object_unref(GTK_OBJECT(e_table->header));
    e_table->header = e_table_state_to_header (GTK_WIDGET(e_table), e_table->full_header, state);
    if (e_table->header)
        gtk_object_ref(GTK_OBJECT(e_table->header));

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

    if (e_table->sort_info) {
        if (e_table->group_info_change_id)
            gtk_signal_disconnect (GTK_OBJECT (e_table->sort_info),
                           e_table->group_info_change_id);
        gtk_object_unref(GTK_OBJECT(e_table->sort_info));
    }
    if (state->sort_info) {
        e_table->sort_info = e_table_sort_info_duplicate(state->sort_info);
        e_table->group_info_change_id =
            gtk_signal_connect (GTK_OBJECT (e_table->sort_info),
                        "group_info_changed",
                        GTK_SIGNAL_FUNC (sort_info_changed),
                        e_table);
    }
    else
        e_table->sort_info = NULL;

    if (e_table->sorter)
        gtk_object_set(GTK_OBJECT(e_table->sorter),
                   "sort_info", e_table->sort_info,
                   NULL);
    if (e_table->header_item)
        gtk_object_set(GTK_OBJECT(e_table->header_item),
                   "ETableHeader", e_table->header,
                   "sort_info", e_table->sort_info,
                   NULL);
    if (e_table->click_to_add)
        gtk_object_set(GTK_OBJECT(e_table->click_to_add),
                   "header", e_table->header,
                   NULL);

    e_table->need_rebuild = TRUE;
    if (!e_table->rebuild_idle_id)
        e_table->rebuild_idle_id = g_idle_add_full (20, changed_idle, e_table, NULL);
}

/**
 * e_table_set_state:
 * @e_table: %ETable 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
 * %ETable object.
 */
void
e_table_set_state (ETable      *e_table,
           const gchar *state_str)
{
    ETableState *state;

    g_return_if_fail(e_table != NULL);
    g_return_if_fail(E_IS_TABLE(e_table));
    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_table_set_state_object(e_table, state);

    gtk_object_unref(GTK_OBJECT(state));
}

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

    g_return_if_fail(e_table != NULL);
    g_return_if_fail(E_IS_TABLE(e_table));
    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_table_set_state_object(e_table, state);

    gtk_object_unref(GTK_OBJECT(state));
}

/**
 * e_table_get_state_object:
 * @e_table: %ETable object that will be modified
 *
 * Returns: the %ETableState object that encapsulates the current
 * state of the @e_table object
 */
ETableState *
e_table_get_state_object (ETable *e_table)
{
    ETableState *state;
    int full_col_count;
    int i, j;

    state = e_table_state_new();
    state->sort_info = e_table->sort_info;
    gtk_object_ref(GTK_OBJECT(state->sort_info));


    state->col_count = e_table_header_count (e_table->header);
    full_col_count = e_table_header_count (e_table->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_table->header, i);
        state->columns[i] = -1;
        for (j = 0; j < full_col_count; j++) {
            if (col->col_idx == e_table_header_index(e_table->full_header, j)) {
                state->columns[i] = j;
                break;
            }
        }
        state->expansions[i] = col->expansion;
    }

    return state;
}

gchar          *e_table_get_state                 (ETable               *e_table)
{
    ETableState *state;
    gchar *string;

    state = e_table_get_state_object(e_table);
    string = e_table_state_save_to_string(state);
    gtk_object_unref(GTK_OBJECT(state));
    return string;
}

/**
 * e_table_save_state:
 * @e_table: %ETable object that will be modified
 * @filename: name of the file containing the state to be loaded into the %ETable
 *
 * This routine saves the state of the @e_table object into the file pointed
 * by @filename
 */
void
e_table_save_state (ETable      *e_table,
            const gchar *filename)
{
    ETableState *state;

    state = e_table_get_state_object(e_table);
    e_table_state_save_to_file(state, filename);
    gtk_object_unref(GTK_OBJECT(state));
}

static void
et_selection_model_selection_change (ETableGroup *etg, ETable *et)
{
    gtk_signal_emit (GTK_OBJECT (et),
             et_signals [SELECTION_CHANGE]);
}

static ETable *
et_real_construct (ETable *e_table, ETableModel *etm, ETableExtras *ete,
           ETableSpecification *specification, ETableState *state)
{
    int row = 0;

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

    e_table->use_click_to_add = specification->click_to_add;
    e_table->click_to_add_message = g_strdup (gettext (specification->click_to_add_message));
    e_table->horizontal_draw_grid = specification->horizontal_draw_grid;
    e_table->vertical_draw_grid = specification->vertical_draw_grid;
    e_table->draw_focus = specification->draw_focus;
    e_table->cursor_mode = specification->cursor_mode;
    e_table->full_header = e_table_spec_to_full_header(specification, ete);

    gtk_object_set(GTK_OBJECT(e_table->selection),
               "selection_mode", specification->selection_mode,
               "cursor_mode", specification->cursor_mode,
               NULL);

    e_table->model = etm;
    gtk_object_ref (GTK_OBJECT (etm));

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

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

    e_table->sort_info = state->sort_info;
    gtk_object_ref (GTK_OBJECT (state->sort_info));

    e_table->group_info_change_id =
        gtk_signal_connect (GTK_OBJECT (e_table->sort_info), "group_info_changed",
                    GTK_SIGNAL_FUNC (sort_info_changed), e_table);


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

    e_table->sorter = e_table_sorter_new(etm, e_table->full_header, e_table->sort_info);

    gtk_object_set (GTK_OBJECT (e_table->selection),
            "model", etm,
            "sorter", e_table->sorter,
            NULL);

    gtk_signal_connect(GTK_OBJECT(e_table->selection), "selection_changed",
               GTK_SIGNAL_FUNC(et_selection_model_selection_change), e_table);

    if (!specification->no_headers) {
        e_table_setup_header (e_table);
    }
    e_table_setup_table (e_table, e_table->full_header, e_table->header, etm);
    e_table_fill_table (e_table, etm);

    gtk_layout_get_vadjustment (GTK_LAYOUT (e_table->table_canvas))->step_increment = 20;
    gtk_adjustment_changed(gtk_layout_get_vadjustment (GTK_LAYOUT (e_table->table_canvas)));

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

    gtk_widget_pop_colormap ();
    gtk_widget_pop_visual ();

    gtk_object_unref(GTK_OBJECT(ete));

    return e_table;
}

ETable *
e_table_construct (ETable *e_table, ETableModel *etm, ETableExtras *ete,
           const char *spec_str, const char *state_str)
{
    ETableSpecification *specification;
    ETableState *state;

    g_return_val_if_fail(e_table != NULL, NULL);
    g_return_val_if_fail(E_IS_TABLE(e_table), NULL);
    g_return_val_if_fail(etm != NULL, NULL);
    g_return_val_if_fail(E_IS_TABLE_MODEL(etm), NULL);
    g_return_val_if_fail(ete == NULL || E_IS_TABLE_EXTRAS(ete), NULL);
    g_return_val_if_fail(spec_str != NULL, NULL);

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

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

    e_table->spec = specification;
    gtk_object_unref(GTK_OBJECT(state));

    return e_table;
}

ETable *
e_table_construct_from_spec_file (ETable *e_table, ETableModel *etm, ETableExtras *ete,
                  const char *spec_fn, const char *state_fn)
{
    ETableSpecification *specification;
    ETableState *state;

    g_return_val_if_fail(e_table != NULL, NULL);
    g_return_val_if_fail(E_IS_TABLE(e_table), NULL);
    g_return_val_if_fail(etm != NULL, NULL);
    g_return_val_if_fail(E_IS_TABLE_MODEL(etm), NULL);
    g_return_val_if_fail(ete == NULL || E_IS_TABLE_EXTRAS(ete), NULL);
    g_return_val_if_fail(spec_fn != NULL, NULL);

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

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

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

    e_table->spec = specification;
    gtk_object_unref(GTK_OBJECT(state));

    return e_table;
}

GtkWidget *
e_table_new (ETableModel *etm, ETableExtras *ete, const char *spec, const char *state)
{
    ETable *e_table;

    g_return_val_if_fail(etm != NULL, NULL);
    g_return_val_if_fail(E_IS_TABLE_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_table = gtk_type_new (e_table_get_type ());

    e_table = e_table_construct (e_table, etm, ete, spec, state);

    return GTK_WIDGET (e_table);
}

GtkWidget *
e_table_new_from_spec_file (ETableModel *etm, ETableExtras *ete, const char *spec_fn, const char *state_fn)
{
    ETable *e_table;

    g_return_val_if_fail(etm != NULL, NULL);
    g_return_val_if_fail(E_IS_TABLE_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_table = gtk_type_new (e_table_get_type ());

    e_table = e_table_construct_from_spec_file (e_table, etm, ete, spec_fn, state_fn);

    return GTK_WIDGET (e_table);
}

#if 0
static xmlNode *
et_build_column_spec (ETable *e_table)
{
    xmlNode *columns_shown;
    gint i;
    gint col_count;

    columns_shown = xmlNewNode (NULL, "columns-shown");

    col_count = e_table_header_count (e_table->header);
    for (i = 0; i < col_count; i++){
        gchar *text = g_strdup_printf ("%d", e_table_header_index(e_table->header, i));
        xmlNewChild (columns_shown, NULL, "column", text);
        g_free (text);
    }

    return columns_shown;
}

static xmlNode *
et_build_grouping_spec (ETable *e_table)
{
    xmlNode *node;
    xmlNode *grouping;
    int i;
    const int sort_count = e_table_sort_info_sorting_get_count (e_table->sort_info);
    const int group_count = e_table_sort_info_grouping_get_count (e_table->sort_info);

    grouping = xmlNewNode (NULL, "grouping");
    node = grouping;

    for (i = 0; i < group_count; i++) {
        ETableSortColumn column = e_table_sort_info_grouping_get_nth(e_table->sort_info, i);
        xmlNode *new_node = xmlNewChild(node, NULL, "group", NULL);

        e_xml_set_integer_prop_by_name (new_node, "column", column.column);
        e_xml_set_integer_prop_by_name (new_node, "ascending", column.ascending);
        node = new_node;
    }

    for (i = 0; i < sort_count; i++) {
        ETableSortColumn column = e_table_sort_info_sorting_get_nth(e_table->sort_info, i);
        xmlNode *new_node = xmlNewChild(node, NULL, "leaf", NULL);

        e_xml_set_integer_prop_by_name (new_node, "column", column.column);
        e_xml_set_integer_prop_by_name (new_node, "ascending", column.ascending);
        node = new_node;
    }

    return grouping;
}

static xmlDoc *
et_build_tree (ETable *e_table)
{
    xmlDoc *doc;
    xmlNode *root;

    doc = xmlNewDoc ("1.0");
    if (doc == NULL)
        return NULL;

    root = xmlNewDocNode (doc, NULL, "ETableSpecification", NULL);
    xmlDocSetRootElement (doc, root);
    xmlAddChild (root, et_build_column_spec (e_table));
    xmlAddChild (root, et_build_grouping_spec (e_table));

    return doc;
}

gchar *
e_table_get_specification (ETable *e_table)
{
    xmlDoc *doc;
    xmlChar *buffer;
    gint size;

    g_return_val_if_fail(e_table != NULL, NULL);
    g_return_val_if_fail(E_IS_TABLE(e_table), NULL);

    doc = et_build_tree (e_table);
    xmlDocDumpMemory (doc, &buffer, &size);
    xmlFreeDoc (doc);

    return buffer;
}

int
e_table_set_specification (ETable *e_table, const char *spec)
{
    xmlDoc *xmlSpec;
    int ret;

    g_return_val_if_fail(e_table != NULL, -1);
    g_return_val_if_fail(E_IS_TABLE(e_table), -1);
    g_return_val_if_fail(spec != NULL, -1);

    /* doesn't work yet, sigh */
    xmlSpec = xmlParseMemory ((char *)spec, strlen(spec));
    ret = et_real_set_specification(e_table, xmlSpec);
    xmlFreeDoc (xmlSpec);

    return ret;
}

void
e_table_save_specification (ETable *e_table, gchar *filename)
{
    xmlDoc *doc = et_build_tree (e_table);

    g_return_if_fail(e_table != NULL);
    g_return_if_fail(E_IS_TABLE(e_table));
    g_return_if_fail(filename != NULL);

    xmlSaveFile (filename, doc);
    xmlFreeDoc (doc);
}

int
e_table_load_specification (ETable *e_table, gchar *filename)
{
    xmlDoc *xmlSpec;
    int ret;

    g_return_val_if_fail(e_table != NULL, -1);
    g_return_val_if_fail(E_IS_TABLE(e_table), -1);
    g_return_val_if_fail(filename != NULL, -1);

    /* doesn't work yet, yay */
    xmlSpec = xmlParseFile (filename);
    ret = et_real_set_specification(e_table, xmlSpec);
    xmlFreeDoc (xmlSpec);

    return ret;
}
#endif

void
e_table_set_cursor_row (ETable *e_table, int row)
{
    g_return_if_fail(e_table != NULL);
    g_return_if_fail(E_IS_TABLE(e_table));
    g_return_if_fail(row >= 0);

    gtk_object_set(GTK_OBJECT(e_table->selection),
               "cursor_row", row,
               NULL);
}

int
e_table_get_cursor_row (ETable *e_table)
{
    int row;
    g_return_val_if_fail(e_table != NULL, -1);
    g_return_val_if_fail(E_IS_TABLE(e_table), -1);

    gtk_object_get(GTK_OBJECT(e_table->selection),
               "cursor_row", &row,
               NULL);
    return row;
}

void
e_table_selected_row_foreach     (ETable *e_table,
                  EForeachFunc callback,
                  gpointer closure)
{
    g_return_if_fail(e_table != NULL);
    g_return_if_fail(E_IS_TABLE(e_table));

    e_selection_model_foreach(E_SELECTION_MODEL (e_table->selection),
                             callback,
                             closure);
}

gint
e_table_selected_count     (ETable *e_table)
{
    g_return_val_if_fail(e_table != NULL, -1);
    g_return_val_if_fail(E_IS_TABLE(e_table), -1);

    return e_selection_model_selected_count(E_SELECTION_MODEL (e_table->selection));
}

void
e_table_select_all (ETable *table)
{
    g_return_if_fail (table != NULL);
    g_return_if_fail (E_IS_TABLE (table));

    e_selection_model_select_all (E_SELECTION_MODEL (table->selection));
}

void
e_table_invert_selection (ETable *table)
{
    g_return_if_fail (table != NULL);
    g_return_if_fail (E_IS_TABLE (table));

    e_selection_model_invert_selection (E_SELECTION_MODEL (table->selection));
}


EPrintable *
e_table_get_printable (ETable *e_table)
{
    g_return_val_if_fail(e_table != NULL, NULL);
    g_return_val_if_fail(E_IS_TABLE(e_table), NULL);

    return e_table_group_get_printable(e_table->group);
}

static void
et_get_arg (GtkObject *o, GtkArg *arg, guint arg_id)
{
    switch (arg_id){
    default:
        break;
    }
}

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

static void
et_set_arg (GtkObject *o, GtkArg *arg, guint arg_id)
{
    ETable *etable = E_TABLE (o);

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

    }
}

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

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

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

gint
e_table_get_next_row      (ETable *e_table,
               gint    model_row)
{
    g_return_val_if_fail(e_table != NULL, -1);
    g_return_val_if_fail(E_IS_TABLE(e_table), -1);

    if (e_table->sorter) {
        int i;
        i = e_sorter_model_to_sorted(E_SORTER (e_table->sorter), model_row);
        i++;
        if (i < e_table_model_row_count(e_table->model)) {
            return e_sorter_sorted_to_model(E_SORTER (e_table->sorter), i);
        } else
            return -1;
    } else
        if (model_row < e_table_model_row_count(e_table->model) - 1)
            return model_row + 1;
        else
            return -1;
}

gint
e_table_get_prev_row      (ETable *e_table,
               gint    model_row)
{
    g_return_val_if_fail(e_table != NULL, -1);
    g_return_val_if_fail(E_IS_TABLE(e_table), -1);

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

gint
e_table_model_to_view_row        (ETable *e_table,
                  gint    model_row)
{
    g_return_val_if_fail(e_table != NULL, -1);
    g_return_val_if_fail(E_IS_TABLE(e_table), -1);

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

gint
e_table_view_to_model_row        (ETable *e_table,
                  gint    view_row)
{
    g_return_val_if_fail(e_table != NULL, -1);
    g_return_val_if_fail(E_IS_TABLE(e_table), -1);

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

/**
 * e_table_get_cell_at:
 * @table: An ETable 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_table_get_cell_at (ETable *table,
             int x, int y,
             int *row_return, int *col_return)
{
    g_return_if_fail (table != NULL);
    g_return_if_fail (E_IS_TABLE (table));
    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.  */

    x += GTK_LAYOUT(table->table_canvas)->hadjustment->value;
    y += GTK_LAYOUT(table->table_canvas)->vadjustment->value;
    e_table_group_compute_location(table->group, &x, &y, row_return, col_return);
}

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

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

typedef enum
{
  GTK_DRAG_STATUS_DRAG,
  GTK_DRAG_STATUS_WAIT,
  GTK_DRAG_STATUS_DROP
} GtkDragStatus;

typedef struct _GtkDragDestInfo GtkDragDestInfo;
typedef struct _GtkDragSourceInfo GtkDragSourceInfo;

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

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

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

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

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

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

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

/* Drag & drop stuff. */
/* Target */
void
e_table_drag_get_data (ETable         *table,
               int             row,
               int             col,
               GdkDragContext *context,
               GdkAtom         target,
               guint32         time)
{
    g_return_if_fail(table != NULL);
    g_return_if_fail(E_IS_TABLE(table));

    table->drag_get_data_row = row;
    table->drag_get_data_col = col;
    gtk_drag_get_data(GTK_WIDGET(table),
              context,
              target,
              time);

}

/**
 * e_table_drag_highlight:
 * @table:
 * @row:
 * @col:
 *
 * Set col to -1 to highlight the entire row.
 */
void
e_table_drag_highlight (ETable *table,
            int     row,
            int     col)
{
    g_return_if_fail(table != NULL);
    g_return_if_fail(E_IS_TABLE(table));
}

void
e_table_drag_unhighlight (ETable *table)
{
    g_return_if_fail(table != NULL);
    g_return_if_fail(E_IS_TABLE(table));
}

void e_table_drag_dest_set   (ETable               *table,
                  GtkDestDefaults       flags,
                  const GtkTargetEntry *targets,
                  gint                  n_targets,
                  GdkDragAction         actions)
{
    g_return_if_fail(table != NULL);
    g_return_if_fail(E_IS_TABLE(table));

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

void e_table_drag_dest_set_proxy (ETable         *table,
                  GdkWindow      *proxy_window,
                  GdkDragProtocol protocol,
                  gboolean        use_coordinates)
{
    g_return_if_fail(table != NULL);
    g_return_if_fail(E_IS_TABLE(table));

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

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

void
e_table_drag_dest_unset (GtkWidget *widget)
{
    g_return_if_fail(widget != NULL);
    g_return_if_fail(E_IS_TABLE(widget));

    gtk_drag_dest_unset(widget);
}

/* Source side */

void
e_table_drag_source_set  (ETable               *table,
              GdkModifierType       start_button_mask,
              const GtkTargetEntry *targets,
              gint                  n_targets,
              GdkDragAction         actions)
{
    ETableDragSourceSite *site;
    GtkWidget *canvas;

    g_return_if_fail(table != NULL);
    g_return_if_fail(E_IS_TABLE(table));

    canvas = GTK_WIDGET(table->table_canvas);
    site = table->site;

    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 (ETableDragSourceSite, 1);

        table->drag_source_button_press_event_id =
            gtk_signal_connect (GTK_OBJECT (canvas), "button_press_event",
                        GTK_SIGNAL_FUNC (e_table_drag_source_event_cb),
                        table);
        table->drag_source_motion_notify_event_id =
            gtk_signal_connect (GTK_OBJECT (canvas), "motion_notify_event",
                        GTK_SIGNAL_FUNC (e_table_drag_source_event_cb),
                        table);

        table->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_table_drag_source_unset (ETable *table)
{
    ETableDragSourceSite *site;

    g_return_if_fail (table != NULL);
    g_return_if_fail (E_IS_TABLE(table));

    site = table->site;

    if (site) {
        gtk_signal_disconnect (
            GTK_OBJECT (table->table_canvas),
            table->drag_source_button_press_event_id);
        gtk_signal_disconnect (
            GTK_OBJECT (table->table_canvas),
            table->drag_source_motion_notify_event_id);
        g_free (site);
        table->site = NULL;
    }
}

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

GdkDragContext *
e_table_drag_begin (ETable            *table,
            int                row,
            int                col,
            GtkTargetList     *targets,
            GdkDragAction      actions,
            gint               button,
            GdkEvent          *event)
{
    g_return_val_if_fail (table != NULL, NULL);
    g_return_val_if_fail (E_IS_TABLE(table), NULL);

    table->drag_row = row;
    table->drag_col = col;

    return gtk_drag_begin(GTK_WIDGET(table),
                  targets,
                  actions,
                  button,
                  event);
}

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

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

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

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

static void
et_drag_leave(GtkWidget *widget,
          GdkDragContext *context,
          guint time,
          ETable *et)
{
    gtk_signal_emit (GTK_OBJECT (et),
             et_signals [TABLE_DRAG_LEAVE],
             et->drop_row,
             et->drop_col,
             context,
             time);
    et->drop_row = -1;
    et->drop_col = -1;
}

static gboolean
et_drag_motion(GtkWidget *widget,
           GdkDragContext *context,
           gint x,
           gint y,
           guint time,
           ETable *et)
{
    gboolean ret_val;
    int row, col;

    e_table_get_cell_at (et, x, y, &row, &col);

    if (et->drop_row >= 0 && et->drop_col >= 0 &&
        row != et->drop_row && col != et->drop_row) {
        gtk_signal_emit (GTK_OBJECT (et),
                 et_signals [TABLE_DRAG_LEAVE],
                 et->drop_row,
                 et->drop_col,
                 context,
                 time);
    }
    et->drop_row = row;
    et->drop_col = col;
    if (row >= 0 && col >= 0)
        gtk_signal_emit (GTK_OBJECT (et),
                 et_signals [TABLE_DRAG_MOTION],
                 et->drop_row,
                 et->drop_col,
                 context,
                 x,
                 y,
                 time,
                 &ret_val);
    return ret_val;
}

static gboolean
et_drag_drop(GtkWidget *widget,
         GdkDragContext *context,
         gint x,
         gint y,
         guint time,
         ETable *et)
{
    gboolean ret_val;
    int row, col;

    e_table_get_cell_at (et, x, y, &row, &col);

    if (et->drop_row >= 0 && et->drop_col >= 0 &&
        row != et->drop_row && col != et->drop_row) {
        gtk_signal_emit (GTK_OBJECT (et),
                 et_signals [TABLE_DRAG_LEAVE],
                 et->drop_row,
                 et->drop_col,
                 context,
                 time);
        if (row >= 0 && col >= 0)
            gtk_signal_emit (GTK_OBJECT (et),
                     et_signals [TABLE_DRAG_MOTION],
                     row,
                     col,
                     context,
                     x,
                     y,
                     time,
                     &ret_val);
    }
    et->drop_row = row;
    et->drop_col = col;
    if (row >= 0 && col >= 0)
        gtk_signal_emit (GTK_OBJECT (et),
                 et_signals [TABLE_DRAG_DROP],
                 et->drop_row,
                 et->drop_col,
                 context,
                 x,
                 y,
                 time,
                 &ret_val);
    et->drop_row = -1;
    et->drop_col = -1;
    return ret_val;
}

static void
et_drag_data_received(GtkWidget *widget,
              GdkDragContext *context,
              gint x,
              gint y,
              GtkSelectionData *selection_data,
              guint info,
              guint time,
              ETable *et)
{
    int row, col;

    e_table_get_cell_at (et, x, y, &row, &col);

    gtk_signal_emit (GTK_OBJECT (et),
             et_signals [TABLE_DRAG_DATA_RECEIVED],
             row,
             col,
             context,
             x,
             y,
             selection_data,
             info,
             time);
}

static gint
e_table_drag_source_event_cb (GtkWidget      *widget,
                  GdkEvent       *event,
                  ETable         *table)
{
    ETableDragSourceSite *site;
    site = table->site;

    switch (event->type) {
    case GDK_BUTTON_PRESS:
        if ((GDK_BUTTON1_MASK << (event->button.button - 1)) & site->start_button_mask) {
            int row, col;
            e_table_get_cell_at (table, event->button.x, event->button.y, &row, &col);
            if (row >= 0 && col >= 0) {
                site->state |= (GDK_BUTTON1_MASK << (event->button.button - 1));
                site->x = event->button.x;
                site->y = event->button.y;
                site->row = row;
                site->col = col;
            }
        }
        break;

    case GDK_BUTTON_RELEASE:
        if ((GDK_BUTTON1_MASK << (event->button.button - 1)) & site->start_button_mask) {
            site->state &= ~(GDK_BUTTON1_MASK << (event->button.button - 1));
        }
        break;

    case GDK_MOTION_NOTIFY:
        if (site->state & event->motion.state & site->start_button_mask) {
            /* FIXME: This is really broken and can leave us
             * with a stuck grab
             */
            int i;
            for (i=1; i<6; i++) {
                if (site->state & event->motion.state &
                    GDK_BUTTON1_MASK << (i - 1))
                    break;
            }

            if (MAX (abs (site->x - event->motion.x),
                 abs (site->y - event->motion.y)) > 3) {
                GtkDragSourceInfo *info;
                GdkDragContext *context;

                site->state = 0;
                context = e_table_drag_begin (table, site->row, site->col,
                                  site->target_list,
                                  site->actions,
                                  i, event);


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

                if (!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;
            }
        }
        break;

    default:            /* hit for 2/3BUTTON_PRESS */
        break;
    }
    return FALSE;
}

static void
e_table_class_init (ETableClass *class)
{
    GtkObjectClass *object_class;
    GtkWidgetClass *widget_class;
    GtkContainerClass *container_class;

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

    e_table_parent_class = gtk_type_class (PARENT_TYPE);

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

    widget_class->grab_focus = et_grab_focus;

    container_class->focus = et_focus;

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

    class->table_drag_begin         = NULL;
    class->table_drag_end           = NULL;
    class->table_drag_data_get      = NULL;
    class->table_drag_data_delete   = NULL;

    class->table_drag_leave         = NULL;
    class->table_drag_motion        = NULL;
    class->table_drag_drop          = NULL;
    class->table_drag_data_received = NULL;

    et_signals [CURSOR_CHANGE] =
        gtk_signal_new ("cursor_change",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ETableClass, cursor_change),
                gtk_marshal_NONE__INT,
                GTK_TYPE_NONE, 1, GTK_TYPE_INT);

    et_signals [CURSOR_ACTIVATED] =
        gtk_signal_new ("cursor_activated",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ETableClass, cursor_activated),
                gtk_marshal_NONE__INT,
                GTK_TYPE_NONE, 1, GTK_TYPE_INT);

    et_signals [SELECTION_CHANGE] =
        gtk_signal_new ("selection_change",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ETableClass, selection_change),
                gtk_marshal_NONE__NONE,
                GTK_TYPE_NONE, 0);

    et_signals [DOUBLE_CLICK] =
        gtk_signal_new ("double_click",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ETableClass, double_click),
                gtk_marshal_NONE__INT_INT_POINTER,
                GTK_TYPE_NONE, 3, GTK_TYPE_INT, GTK_TYPE_INT, GTK_TYPE_GDK_EVENT);

    et_signals [RIGHT_CLICK] =
        gtk_signal_new ("right_click",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ETableClass, right_click),
                e_marshal_INT__INT_INT_POINTER,
                GTK_TYPE_INT, 3, GTK_TYPE_INT, GTK_TYPE_INT, GTK_TYPE_GDK_EVENT);

    et_signals [CLICK] =
        gtk_signal_new ("click",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ETableClass, click),
                e_marshal_INT__INT_INT_POINTER,
                GTK_TYPE_INT, 3, GTK_TYPE_INT, GTK_TYPE_INT, GTK_TYPE_GDK_EVENT);

    et_signals [KEY_PRESS] =
        gtk_signal_new ("key_press",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ETableClass, key_press),
                e_marshal_INT__INT_INT_POINTER,
                GTK_TYPE_INT, 3, GTK_TYPE_INT, GTK_TYPE_INT, GTK_TYPE_GDK_EVENT);

    et_signals[TABLE_DRAG_BEGIN] =
        gtk_signal_new ("table_drag_begin",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ETableClass, table_drag_begin),
                gtk_marshal_NONE__INT_INT_POINTER,
                GTK_TYPE_NONE, 3,
                GTK_TYPE_INT,
                GTK_TYPE_INT,
                GTK_TYPE_GDK_DRAG_CONTEXT);
    et_signals[TABLE_DRAG_END] =
        gtk_signal_new ("table_drag_end",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ETableClass, table_drag_end),
                gtk_marshal_NONE__INT_INT_POINTER,
                GTK_TYPE_NONE, 3,
                GTK_TYPE_INT,
                GTK_TYPE_INT,
                GTK_TYPE_GDK_DRAG_CONTEXT);
    et_signals[TABLE_DRAG_DATA_GET] =
        gtk_signal_new ("table_drag_data_get",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ETableClass, table_drag_data_get),
                e_marshal_NONE__INT_INT_POINTER_POINTER_UINT_UINT,
                GTK_TYPE_NONE, 6,
                GTK_TYPE_INT,
                GTK_TYPE_INT,
                GTK_TYPE_GDK_DRAG_CONTEXT,
                GTK_TYPE_SELECTION_DATA,
                GTK_TYPE_UINT,
                GTK_TYPE_UINT);
    et_signals[TABLE_DRAG_DATA_DELETE] =
        gtk_signal_new ("table_drag_data_delete",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ETableClass, table_drag_data_delete),
                gtk_marshal_NONE__INT_INT_POINTER,
                GTK_TYPE_NONE, 3,
                GTK_TYPE_INT,
                GTK_TYPE_INT,
                GTK_TYPE_GDK_DRAG_CONTEXT);

    et_signals[TABLE_DRAG_LEAVE] =
        gtk_signal_new ("table_drag_leave",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ETableClass, table_drag_leave),
                e_marshal_NONE__INT_INT_POINTER_UINT,
                GTK_TYPE_NONE, 4,
                GTK_TYPE_INT,
                GTK_TYPE_INT,
                GTK_TYPE_GDK_DRAG_CONTEXT,
                GTK_TYPE_UINT);
    et_signals[TABLE_DRAG_MOTION] =
        gtk_signal_new ("table_drag_motion",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ETableClass, table_drag_motion),
                e_marshal_BOOL__INT_INT_POINTER_INT_INT_UINT,
                GTK_TYPE_BOOL, 6,
                GTK_TYPE_INT,
                GTK_TYPE_INT,
                GTK_TYPE_GDK_DRAG_CONTEXT,
                GTK_TYPE_INT,
                GTK_TYPE_INT,
                GTK_TYPE_UINT);
    et_signals[TABLE_DRAG_DROP] =
        gtk_signal_new ("table_drag_drop",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ETableClass, table_drag_drop),
                e_marshal_BOOL__INT_INT_POINTER_INT_INT_UINT,
                GTK_TYPE_BOOL, 6,
                GTK_TYPE_INT,
                GTK_TYPE_INT,
                GTK_TYPE_GDK_DRAG_CONTEXT,
                GTK_TYPE_INT,
                GTK_TYPE_INT,
                GTK_TYPE_UINT);
    et_signals[TABLE_DRAG_DATA_RECEIVED] =
        gtk_signal_new ("table_drag_data_received",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ETableClass, table_drag_data_received),
                e_marshal_NONE__INT_INT_POINTER_INT_INT_POINTER_UINT_UINT,
                GTK_TYPE_NONE, 8,
                GTK_TYPE_INT,
                GTK_TYPE_INT,
                GTK_TYPE_GDK_DRAG_CONTEXT,
                GTK_TYPE_INT,
                GTK_TYPE_INT,
                GTK_TYPE_SELECTION_DATA,
                GTK_TYPE_UINT,
                GTK_TYPE_UINT);

    gtk_object_class_add_signals (object_class, et_signals, LAST_SIGNAL);

    class->set_scroll_adjustments = set_scroll_adjustments;

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

    gtk_object_add_arg_type ("ETable::length_threshold", GTK_TYPE_INT,
                 GTK_ARG_WRITABLE, ARG_LENGTH_THRESHOLD);
}

E_MAKE_TYPE(e_table, "ETable", ETable, e_table_class_init, e_table_init, PARENT_TYPE);