path: root/calendar/gui/e-calendar-table.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */

/*
 * Authors :
 *  Damon Chaplin <damon@ximian.com>
 *  Rodrigo Moya <rodrigo@ximian.com>
 *
 * Copyright 2000, Ximian, Inc.
 * Copyright 2000, Ximian, Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA
 */

/*
 * ECalendarTable - displays the CalComponent objects in a table (an ETable).
 * Used for calendar events and tasks.
 */

#include <config.h>
#include <sys/stat.h>
#include <unistd.h>
#include <gnome.h>
#include <gtk/gtkinvisible.h>
#include <gal/e-table/e-cell-checkbox.h>
#include <gal/e-table/e-cell-toggle.h>
#include <gal/e-table/e-cell-text.h>
#include <gal/e-table/e-cell-combo.h>
#include <gal/widgets/e-popup-menu.h>
#include <e-util/e-dialog-utils.h>
#include <widgets/misc/e-cell-date-edit.h>
#include <widgets/misc/e-cell-percent.h>
#include "e-comp-editor-registry.h"
#include "e-calendar-table.h"
#include "e-cell-date-edit-text.h"
#include "calendar-config.h"
#include "calendar-model.h"
#include "print.h"
#include "dialogs/delete-comp.h"
#include "dialogs/task-editor.h"

/* Pixmaps. */
#include "art/task.xpm"
#include "art/task-recurring.xpm"
#include "art/task-assigned.xpm"
#include "art/task-assigned-to.xpm"

#include "art/check-filled.xpm"

extern ECompEditorRegistry *comp_editor_registry;

static void e_calendar_table_class_init     (ECalendarTableClass *class);
static void e_calendar_table_init       (ECalendarTable *cal_table);
static void e_calendar_table_destroy        (GtkObject  *object);

static void e_calendar_table_on_double_click    (ETable     *table,
                         gint        row,
                         gint        col,
                         GdkEvent   *event,
                         ECalendarTable *cal_table);
static gint e_calendar_table_on_right_click (ETable     *table,
                         gint        row,
                         gint        col,
                         GdkEventButton *event,
                         ECalendarTable *cal_table);
static void e_calendar_table_on_open_task   (GtkWidget  *menuitem,
                         gpointer    data);
static void e_calendar_table_on_save_as         (GtkWidget  *menuitem,
                         gpointer    data);
static void e_calendar_table_on_print_task      (GtkWidget  *menuitem,
                         gpointer    data);
static void e_calendar_table_on_cut             (GtkWidget      *menuitem,
                         gpointer        data);
static void e_calendar_table_on_copy            (GtkWidget      *menuitem,
                         gpointer        data);
static void e_calendar_table_on_paste           (GtkWidget      *menuitem,
                         gpointer        data);
static void e_calendar_table_on_assign          (GtkWidget      *menuitem,
                         gpointer        data);
static void e_calendar_table_on_forward         (GtkWidget      *menuitem,
                         gpointer        data);
static gint e_calendar_table_on_key_press   (ETable     *table,
                         gint        row,
                         gint        col,
                         GdkEventKey    *event,
                         ECalendarTable *cal_table);

static void selection_clear_event               (GtkWidget *invisible,
                         GdkEventSelection *event,
                         ECalendarTable *cal_table);
static void selection_received                  (GtkWidget *invisible,
                         GtkSelectionData *selection_data,
                         guint time,
                         ECalendarTable *cal_table);
static void selection_get                       (GtkWidget *invisible,
                         GtkSelectionData *selection_data,
                         guint info,
                         guint time_stamp,
                         ECalendarTable *cal_table);
static void invisible_destroyed                 (GtkWidget *invisible,
                         ECalendarTable *cal_table);
static struct tm e_calendar_table_get_current_time (ECellDateEdit *ecde,
                            gpointer data);
static void mark_row_complete_cb (int model_row, gpointer data);


/* The icons to represent the task. */
#define E_CALENDAR_MODEL_NUM_ICONS  4
static char** icon_xpm_data[E_CALENDAR_MODEL_NUM_ICONS] = {
    task_xpm, task_recurring_xpm, task_assigned_xpm, task_assigned_to_xpm
};
static GdkPixbuf* icon_pixbufs[E_CALENDAR_MODEL_NUM_ICONS] = { 0 };

static GtkTableClass *parent_class;
static GdkAtom clipboard_atom = GDK_NONE;

E_MAKE_TYPE (e_calendar_table, "ECalendarTable", ECalendarTable, e_calendar_table_class_init,
         e_calendar_table_init, GTK_TYPE_TABLE);

static void
e_calendar_table_class_init (ECalendarTableClass *class)
{
    GtkObjectClass *object_class;
    GtkWidgetClass *widget_class;

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

    /* Method override */
    object_class->destroy       = e_calendar_table_destroy;

#if 0
    widget_class->realize       = e_calendar_table_realize;
    widget_class->unrealize     = e_calendar_table_unrealize;
    widget_class->style_set     = e_calendar_table_style_set;
    widget_class->size_allocate = e_calendar_table_size_allocate;
    widget_class->focus_in_event    = e_calendar_table_focus_in;
    widget_class->focus_out_event   = e_calendar_table_focus_out;
    widget_class->key_press_event   = e_calendar_table_key_press;
#endif

    /* clipboard atom */
    if (!clipboard_atom)
        clipboard_atom = gdk_atom_intern ("CLIPBOARD", FALSE);
}

/* Compares two priority values, which may not exist */
static int
compare_priorities (int *a, int *b)
{
    if (a && b) {
        if (*a < *b)
            return -1;
        else if (*a > *b)
            return 1;
        else
            return 0;
    } else if (a)
        return -1;
    else if (b)
        return 1;
    else
        return 0;
}

/* Comparison function for the task-sort column.  Sorts by due date and then by
 * priority.
 *
 * FIXME: Does this ever get called?? It doesn't seem to.
 * I specified that the table should be sorted by this column, but it still
 * never calls this function.
 * Also, this assumes it is passed pointers to CalComponents, but I think it
 * may just be passed pointers to the 2 cell values.
 */
static gint
task_compare_cb (gconstpointer a, gconstpointer b)
{
    CalComponent *ca, *cb;
    CalComponentDateTime due_a, due_b;
    int *prio_a, *prio_b;
    int retval;

    ca = CAL_COMPONENT (a);
    cb = CAL_COMPONENT (b);

    cal_component_get_due (ca, &due_a);
    cal_component_get_due (cb, &due_b);
    cal_component_get_priority (ca, &prio_a);
    cal_component_get_priority (cb, &prio_b);

    if (due_a.value && due_b.value) {
        int v;

        /* FIXME: TIMEZONES. But currently we have no way to get the
           CalClient, so we can't get the timezone. */
        v = icaltime_compare (*due_a.value, *due_b.value);

        if (v == 0)
            retval = compare_priorities (prio_a, prio_b);
        else
            retval = v;
    } else if (due_a.value)
        retval = -1;
    else if (due_b.value)
        retval = 1;
    else
        retval = compare_priorities (prio_a, prio_b);

    cal_component_free_datetime (&due_a);
    cal_component_free_datetime (&due_b);

    if (prio_a)
        cal_component_free_priority (prio_a);

    if (prio_b)
        cal_component_free_priority (prio_b);

    return retval;
}

static gint
date_compare_cb (gconstpointer a, gconstpointer b)
{
    ECellDateEditValue *dv1 = (ECellDateEditValue *) a;
    ECellDateEditValue *dv2 = (ECellDateEditValue *) b;
    struct icaltimetype tt;

    /* First check if either is NULL. NULL dates sort last. */
    if (!dv1 || !dv2) {
        if (dv1 == dv2)
            return 0;
        else if (dv1)
            return -1;
        else
            return 1;
    }

    /* Copy the 2nd value and convert it to the same timezone as the
       first. */
    tt = dv2->tt;

    icaltimezone_convert_time (&tt, dv2->zone, dv1->zone);

    /* Now we can compare them. */

    return icaltime_compare (dv1->tt, tt);
}

static gint
percent_compare_cb (gconstpointer a, gconstpointer b)
{
    int percent1 = GPOINTER_TO_INT (a);
    int percent2 = GPOINTER_TO_INT (b);
    int retval;

    if (percent1 > percent2)
        retval = 1;
    else if (percent1 < percent2)
        retval = -1;
    else
        retval = 0;

    return retval;
}

static gint
priority_compare_cb (gconstpointer a, gconstpointer b)
{
    int priority1, priority2;

    priority1 = cal_util_priority_from_string ((const char*) a);
    priority2 = cal_util_priority_from_string ((const char*) b);

    /* We change undefined priorities so they appear after 'Low'. */
    if (priority1 <= 0)
        priority1 = 10;
    if (priority2 <= 0)
        priority2 = 10;

    /* We'll just use the ordering of the priority values. */
    if (priority1 < priority2)
        return -1;
    else if (priority1 > priority2)
        return 1;
    else
        return 0;
}

static void
e_calendar_table_init (ECalendarTable *cal_table)
{
    GtkWidget *table;
    ETable *e_table;
    ECell *cell, *popup_cell;
    ETableExtras *extras;
    gint i;
    GdkPixbuf *pixbuf;
    GList *strings;

    /* Create the model */

    cal_table->model = calendar_model_new ();

    /* Create the header columns */

    extras = e_table_extras_new();

    /*
     * Normal string fields.
     */
    cell = e_cell_text_new (NULL, GTK_JUSTIFY_LEFT);
    g_object_set (G_OBJECT (cell),
              "strikeout_column", CAL_COMPONENT_FIELD_COMPLETE,
              "bold_column", CAL_COMPONENT_FIELD_OVERDUE,
              "color_column", CAL_COMPONENT_FIELD_COLOR,
              NULL);

    e_table_extras_add_cell (extras, "calstring", cell);


    /*
     * Date fields.
     */
    cell = e_cell_date_edit_text_new (NULL, GTK_JUSTIFY_LEFT);
    g_object_set (G_OBJECT (cell),
              "strikeout_column", CAL_COMPONENT_FIELD_COMPLETE,
              "bold_column", CAL_COMPONENT_FIELD_OVERDUE,
              "color_column", CAL_COMPONENT_FIELD_COLOR,
              NULL);

    popup_cell = e_cell_date_edit_new ();
    e_cell_popup_set_child (E_CELL_POPUP (popup_cell), cell);
    g_object_unref (cell);
    e_table_extras_add_cell (extras, "dateedit", popup_cell);
    cal_table->dates_cell = E_CELL_DATE_EDIT (popup_cell);

    e_cell_date_edit_set_get_time_callback (E_CELL_DATE_EDIT (popup_cell),
                        e_calendar_table_get_current_time,
                        cal_table, NULL);


    /*
     * Combo fields.
     */

    /* Classification field. */
    cell = e_cell_text_new (NULL, GTK_JUSTIFY_LEFT);
    g_object_set (G_OBJECT (cell),
              "strikeout_column", CAL_COMPONENT_FIELD_COMPLETE,
              "bold_column", CAL_COMPONENT_FIELD_OVERDUE,
              "color_column", CAL_COMPONENT_FIELD_COLOR,
              "editable", FALSE,
              NULL);

    popup_cell = e_cell_combo_new ();
    e_cell_popup_set_child (E_CELL_POPUP (popup_cell), cell);
    g_object_unref (cell);

    strings = NULL;
    strings = g_list_append (strings, (char*) _("Public"));
    strings = g_list_append (strings, (char*) _("Private"));
    strings = g_list_append (strings, (char*) _("Confidential"));
    e_cell_combo_set_popdown_strings (E_CELL_COMBO (popup_cell),
                      strings);

    e_table_extras_add_cell (extras, "classification", popup_cell);

    /* Priority field. */
    cell = e_cell_text_new (NULL, GTK_JUSTIFY_LEFT);
    g_object_set (G_OBJECT (cell),
              "strikeout_column", CAL_COMPONENT_FIELD_COMPLETE,
              "bold_column", CAL_COMPONENT_FIELD_OVERDUE,
              "color_column", CAL_COMPONENT_FIELD_COLOR,
              "editable", FALSE,
              NULL);

    popup_cell = e_cell_combo_new ();
    e_cell_popup_set_child (E_CELL_POPUP (popup_cell), cell);
    g_object_unref (cell);

    strings = NULL;
    strings = g_list_append (strings, (char*) _("High"));
    strings = g_list_append (strings, (char*) _("Normal"));
    strings = g_list_append (strings, (char*) _("Low"));
    strings = g_list_append (strings, (char*) _("Undefined"));
    e_cell_combo_set_popdown_strings (E_CELL_COMBO (popup_cell),
                      strings);

    e_table_extras_add_cell (extras, "priority", popup_cell);

    /* Percent field. */
    cell = e_cell_percent_new (NULL, GTK_JUSTIFY_LEFT);
    g_object_set (G_OBJECT (cell),
              "strikeout_column", CAL_COMPONENT_FIELD_COMPLETE,
              "bold_column", CAL_COMPONENT_FIELD_OVERDUE,
              "color_column", CAL_COMPONENT_FIELD_COLOR,
              NULL);

    popup_cell = e_cell_combo_new ();
    e_cell_popup_set_child (E_CELL_POPUP (popup_cell), cell);
    g_object_unref (cell);

    strings = NULL;
    strings = g_list_append (strings, (char*) _("0%"));
    strings = g_list_append (strings, (char*) _("10%"));
    strings = g_list_append (strings, (char*) _("20%"));
    strings = g_list_append (strings, (char*) _("30%"));
    strings = g_list_append (strings, (char*) _("40%"));
    strings = g_list_append (strings, (char*) _("50%"));
    strings = g_list_append (strings, (char*) _("60%"));
    strings = g_list_append (strings, (char*) _("70%"));
    strings = g_list_append (strings, (char*) _("80%"));
    strings = g_list_append (strings, (char*) _("90%"));
    strings = g_list_append (strings, (char*) _("100%"));
    e_cell_combo_set_popdown_strings (E_CELL_COMBO (popup_cell),
                      strings);

    e_table_extras_add_cell (extras, "percent", popup_cell);

    /* Transparency field. */
    cell = e_cell_text_new (NULL, GTK_JUSTIFY_LEFT);
    g_object_set (G_OBJECT (cell),
              "strikeout_column", CAL_COMPONENT_FIELD_COMPLETE,
              "bold_column", CAL_COMPONENT_FIELD_OVERDUE,
              "color_column", CAL_COMPONENT_FIELD_COLOR,
              "editable", FALSE,
              NULL);

    popup_cell = e_cell_combo_new ();
    e_cell_popup_set_child (E_CELL_POPUP (popup_cell), cell);
    g_object_unref (cell);

    strings = NULL;
    strings = g_list_append (strings, (char*) _("Free"));
    strings = g_list_append (strings, (char*) _("Busy"));
    e_cell_combo_set_popdown_strings (E_CELL_COMBO (popup_cell),
                      strings);

    e_table_extras_add_cell (extras, "transparency", popup_cell);

    /* Status field. */
    cell = e_cell_text_new (NULL, GTK_JUSTIFY_LEFT);
    g_object_set (G_OBJECT (cell),
              "strikeout_column", CAL_COMPONENT_FIELD_COMPLETE,
              "bold_column", CAL_COMPONENT_FIELD_OVERDUE,
              "color_column", CAL_COMPONENT_FIELD_COLOR,
              "editable", FALSE,
              NULL);

    popup_cell = e_cell_combo_new ();
    e_cell_popup_set_child (E_CELL_POPUP (popup_cell), cell);
    g_object_unref (cell);

    strings = NULL;
    strings = g_list_append (strings, (char*) _("Not Started"));
    strings = g_list_append (strings, (char*) _("In Progress"));
    strings = g_list_append (strings, (char*) _("Completed"));
    strings = g_list_append (strings, (char*) _("Cancelled"));
    e_cell_combo_set_popdown_strings (E_CELL_COMBO (popup_cell),
                      strings);

    e_table_extras_add_cell (extras, "calstatus", popup_cell);

    /* Task sorting field */
    /* FIXME: This column should not be displayed, but ETableExtras requires
     * its shit to be visible columns listed in the XML spec.
     */
    e_table_extras_add_compare (extras, "task-sort", task_compare_cb);

    e_table_extras_add_compare (extras, "date-compare",
                    date_compare_cb);
    e_table_extras_add_compare (extras, "percent-compare",
                    percent_compare_cb);
    e_table_extras_add_compare (extras, "priority-compare",
                    priority_compare_cb);

    /* Create pixmaps */

    if (!icon_pixbufs[0])
        for (i = 0; i < E_CALENDAR_MODEL_NUM_ICONS; i++) {
            icon_pixbufs[i] = gdk_pixbuf_new_from_xpm_data (
                (const char **) icon_xpm_data[i]);
        }

    cell = e_cell_toggle_new (0, E_CALENDAR_MODEL_NUM_ICONS, icon_pixbufs);
    e_table_extras_add_cell(extras, "icon", cell);
    e_table_extras_add_pixbuf(extras, "icon", icon_pixbufs[0]);

    pixbuf = gdk_pixbuf_new_from_xpm_data ((const char **) check_filled_xpm);
    e_table_extras_add_pixbuf(extras, "complete", pixbuf);
    gdk_pixbuf_unref(pixbuf);

    /* Create the table */

    table = e_table_scrolled_new_from_spec_file (E_TABLE_MODEL (cal_table->model),
                             extras,
                             EVOLUTION_ETSPECDIR "/e-calendar-table.etspec",
                             NULL);
    g_object_unref (extras);

    cal_table->etable = table;
    gtk_table_attach (GTK_TABLE (cal_table), table, 0, 1, 0, 1,
              GTK_EXPAND | GTK_FILL, GTK_EXPAND | GTK_FILL, 0, 0);
    gtk_widget_show (table);


    e_table = e_table_scrolled_get_table (E_TABLE_SCROLLED (table));
    g_signal_connect (e_table, "double_click", G_CALLBACK (e_calendar_table_on_double_click), cal_table);
    g_signal_connect (e_table, "right_click", G_CALLBACK (e_calendar_table_on_right_click), cal_table);
    g_signal_connect (e_table, "key_press", G_CALLBACK (e_calendar_table_on_key_press), cal_table);

    /* Set up the invisible widget for the clipboard selections */
    cal_table->invisible = gtk_invisible_new ();
    gtk_selection_add_target (cal_table->invisible,
                  clipboard_atom,
                  GDK_SELECTION_TYPE_STRING,
                  0);
    g_signal_connect (cal_table->invisible, "selection_get",
              G_CALLBACK (selection_get), cal_table);
    g_signal_connect (cal_table->invisible, "selection_clear_event",
              G_CALLBACK (selection_clear_event), cal_table);
    g_signal_connect (cal_table->invisible, "selection_received",
              G_CALLBACK (selection_received), cal_table);
    g_signal_connect (cal_table->invisible, "destroy",
              G_CALLBACK (invisible_destroyed), cal_table);

    cal_table->clipboard_selection = NULL;
}


/**
 * e_calendar_table_new:
 * @Returns: a new #ECalendarTable.
 *
 * Creates a new #ECalendarTable.
 **/
GtkWidget *
e_calendar_table_new (void)
{
    GtkWidget *cal_table;

    cal_table = GTK_WIDGET (g_object_new (e_calendar_table_get_type (), NULL));

    return cal_table;
}


/**
 * e_calendar_table_get_model:
 * @cal_table: A calendar table.
 * 
 * Queries the calendar data model that a calendar table is using.
 * 
 * Return value: A calendar model.
 **/
CalendarModel *
e_calendar_table_get_model (ECalendarTable *cal_table)
{
    g_return_val_if_fail (cal_table != NULL, NULL);
    g_return_val_if_fail (E_IS_CALENDAR_TABLE (cal_table), NULL);

    return cal_table->model;
}


static void
e_calendar_table_destroy (GtkObject *object)
{
    ECalendarTable *cal_table;

    cal_table = E_CALENDAR_TABLE (object);

    g_object_unref (cal_table->model);
    cal_table->model = NULL;

    if (cal_table->invisible)
        gtk_widget_destroy (cal_table->invisible);
    if (cal_table->clipboard_selection) {
        g_free (cal_table->clipboard_selection);
        cal_table->clipboard_selection = NULL;
    }

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

/**
 * e_calendar_table_get_table:
 * @cal_table: A calendar table.
 * 
 * Queries the #ETable widget that the calendar table is using.
 * 
 * Return value: The #ETable widget that the calendar table uses to display its
 * data.
 **/
ETable *
e_calendar_table_get_table (ECalendarTable *cal_table)
{
    g_return_val_if_fail (cal_table != NULL, NULL);
    g_return_val_if_fail (E_IS_CALENDAR_TABLE (cal_table), NULL);

    return e_table_scrolled_get_table (E_TABLE_SCROLLED (cal_table->etable));
}

/**
 * e_calendar_table_complete_selected:
 * @cal_table: A calendar table
 * 
 * Marks the selected items as completed
 **/
void
e_calendar_table_complete_selected (ECalendarTable *cal_table)
{
    ETable *etable;

    g_return_if_fail (cal_table != NULL);
    g_return_if_fail (E_IS_CALENDAR_TABLE (cal_table));

    etable = e_table_scrolled_get_table (E_TABLE_SCROLLED (cal_table->etable));
    e_table_selected_row_foreach (etable, mark_row_complete_cb, cal_table);
}

/* Used from e_table_selected_row_foreach(); puts the selected row number in an
 * int pointed to by the closure data.
 */
static void
get_selected_row_cb (int model_row, gpointer data)
{
    int *row;

    row = data;
    *row = model_row;
}

/* Returns the component that is selected in the table; only works if there is
 * one and only one selected row.
 */
static CalComponent *
get_selected_comp (ECalendarTable *cal_table)
{
    ETable *etable;
    int row;

    etable = e_table_scrolled_get_table (E_TABLE_SCROLLED (cal_table->etable));
    if (e_table_selected_count (etable) != 1)
        return NULL;

    row = -1;
    e_table_selected_row_foreach (etable,
                      get_selected_row_cb,
                      &row);
    g_assert (row != -1);

    return calendar_model_get_component (cal_table->model, row);
}

struct get_selected_uids_closure {
    ECalendarTable *cal_table;
    GSList *uids;
};

/* Used from e_table_selected_row_foreach(), builds a list of the selected UIDs */
static void
add_uid_cb (int model_row, gpointer data)
{
    struct get_selected_uids_closure *closure;
    CalComponent *comp;
    const char *uid;

    closure = data;

    comp = calendar_model_get_component (closure->cal_table->model, model_row);
    cal_component_get_uid (comp, &uid);

    closure->uids = g_slist_prepend (closure->uids, (char *) uid);
}

static GSList *
get_selected_uids (ECalendarTable *cal_table)
{
    struct get_selected_uids_closure closure;
    ETable *etable;

    closure.cal_table = cal_table;
    closure.uids = NULL;

    etable = e_table_scrolled_get_table (E_TABLE_SCROLLED (cal_table->etable));
    e_table_selected_row_foreach (etable, add_uid_cb, &closure);

    return closure.uids;
}

/* Deletes all of the selected components in the table */
static void
delete_selected_components (ECalendarTable *cal_table)
{
    CalClient *client;
    GSList *uids, *l;

    uids = get_selected_uids (cal_table);

    client = calendar_model_get_cal_client (cal_table->model);

    calendar_model_set_status_message (e_calendar_table_get_model (cal_table),
                       _("Deleting selected objects"));

    for (l = uids; l; l = l->next) {
        const char *uid;

        uid = l->data;

        /* We don't check the return value; FALSE can mean the object
         * was not in the server anyways.
         */
        cal_client_remove_object (client, uid);
    }

    calendar_model_set_status_message (e_calendar_table_get_model (cal_table), NULL);

    g_slist_free (uids);
}

/**
 * e_calendar_table_delete_selected:
 * @cal_table: A calendar table.
 * 
 * Deletes the selected components in the table; asks the user first.
 **/
void
e_calendar_table_delete_selected (ECalendarTable *cal_table)
{
    ETable *etable;
    int n_selected;
    CalComponent *comp;

    g_return_if_fail (cal_table != NULL);
    g_return_if_fail (E_IS_CALENDAR_TABLE (cal_table));

    etable = e_table_scrolled_get_table (E_TABLE_SCROLLED (cal_table->etable));

    n_selected = e_table_selected_count (etable);
    if (n_selected <= 0)
        return;

    if (n_selected == 1)
        comp = get_selected_comp (cal_table);
    else
        comp = NULL;

    /* FIXME: this may be something other than a TODO component */

    if (delete_component_dialog (comp, FALSE, n_selected, CAL_COMPONENT_TODO,
                     GTK_WIDGET (cal_table)))
        delete_selected_components (cal_table);
}

/**
 * e_calendar_table_cut_clipboard:
 * @cal_table: A calendar table.
 *
 * Cuts selected tasks in the given calendar table
 */
void
e_calendar_table_cut_clipboard (ECalendarTable *cal_table)
{
    g_return_if_fail (E_IS_CALENDAR_TABLE (cal_table));

    e_calendar_table_copy_clipboard (cal_table);
    delete_selected_components (cal_table);
}

/* callback for e_table_selected_row_foreach */
static void
copy_row_cb (int model_row, gpointer data)
{
    ECalendarTable *cal_table;
    CalComponent *comp;
    gchar *comp_str;
    icalcomponent *child;

    cal_table = E_CALENDAR_TABLE (data);

    g_return_if_fail (cal_table->tmp_vcal != NULL);

    comp = calendar_model_get_component (cal_table->model, model_row);
    if (!comp)
        return;

    /* add timezones to the VCALENDAR component */
    cal_util_add_timezones_from_component (cal_table->tmp_vcal, comp);

    /* add the new component to the VCALENDAR component */
    comp_str = cal_component_get_as_string (comp);
    child = icalparser_parse_string (comp_str);
    if (child) {
        icalcomponent_add_component (cal_table->tmp_vcal,
                         icalcomponent_new_clone (child));
        icalcomponent_free (child);
    }

    g_free (comp_str);
}

/**
 * e_calendar_table_copy_clipboard:
 * @cal_table: A calendar table.
 *
 * Copies selected tasks into the clipboard
 */
void
e_calendar_table_copy_clipboard (ECalendarTable *cal_table)
{
    ETable *etable;
    char *comp_str;
    
    g_return_if_fail (E_IS_CALENDAR_TABLE (cal_table));

    if (cal_table->clipboard_selection) {
        g_free (cal_table->clipboard_selection);
        cal_table->clipboard_selection = NULL;
    }

    /* create temporary VCALENDAR object */
    cal_table->tmp_vcal = cal_util_new_top_level ();

    etable = e_table_scrolled_get_table (E_TABLE_SCROLLED (cal_table->etable));
    e_table_selected_row_foreach (etable, copy_row_cb, cal_table);

    comp_str = icalcomponent_as_ical_string (cal_table->tmp_vcal);
    cal_table->clipboard_selection = g_strdup (comp_str);
    icalcomponent_free (cal_table->tmp_vcal);
    cal_table->tmp_vcal = NULL;

    gtk_selection_owner_set (cal_table->invisible, clipboard_atom, GDK_CURRENT_TIME);
}

/**
 * e_calendar_table_paste_clipboard:
 * @cal_table: A calendar table.
 *
 * Pastes tasks currently in the clipboard into the given calendar table
 */
void
e_calendar_table_paste_clipboard (ECalendarTable *cal_table)
{
    g_return_if_fail (E_IS_CALENDAR_TABLE (cal_table));

    gtk_selection_convert (cal_table->invisible,
                   clipboard_atom,
                   GDK_SELECTION_TYPE_STRING,
                   GDK_CURRENT_TIME);
}

/* Opens a task in the task editor */
static void
open_task (ECalendarTable *cal_table, CalComponent *comp, gboolean assign)
{
    CompEditor *tedit;
    const char *uid;
    
    cal_component_get_uid (comp, &uid);

    tedit = e_comp_editor_registry_find (comp_editor_registry, uid);
    if (tedit == NULL) {
        tedit = COMP_EDITOR (task_editor_new (calendar_model_get_cal_client (cal_table->model)));

        comp_editor_edit_comp (tedit, comp);
        if (assign)
            task_editor_show_assignment (TASK_EDITOR (tedit));
        
        e_comp_editor_registry_add (comp_editor_registry, tedit, FALSE);
    }
    
    comp_editor_focus (tedit);
}

/* Opens the task in the specified row */
static void
open_task_by_row (ECalendarTable *cal_table, int row)
{
    CalComponent *comp;

    comp = calendar_model_get_component (cal_table->model, row);
    open_task (cal_table, comp, FALSE);
}

static void
e_calendar_table_on_double_click (ETable *table,
                  gint row, 
                  gint col,
                  GdkEvent *event,
                  ECalendarTable *cal_table)
{
    open_task_by_row (cal_table, row);
}

/* Used from e_table_selected_row_foreach() */
static void
mark_row_complete_cb (int model_row, gpointer data)
{
    ECalendarTable *cal_table;

    cal_table = E_CALENDAR_TABLE (data);
    calendar_model_mark_task_complete (cal_table->model, model_row);
}

/* Callback used for the "mark tasks as complete" menu item */
static void
mark_as_complete_cb (GtkWidget *menuitem, gpointer data)
{
    ECalendarTable *cal_table;
    ETable *etable;

    cal_table = E_CALENDAR_TABLE (data);

    etable = e_table_scrolled_get_table (E_TABLE_SCROLLED (cal_table->etable));
    e_table_selected_row_foreach (etable, mark_row_complete_cb, cal_table);
}

/* Callback for the "delete tasks" menu item */
static void
delete_cb (GtkWidget *menuitem, gpointer data)
{
    ECalendarTable *cal_table;

    cal_table = E_CALENDAR_TABLE (data);
    e_calendar_table_delete_selected (cal_table);
}


enum {
    MASK_SINGLE = 1 << 0,   /* For commands that work on 1 task. */
    MASK_MULTIPLE   = 1 << 1,   /* For commands for multiple tasks. */
    MASK_EDITABLE   = 1 << 2,       /* For commands disabled in read-only folders */
    MASK_ASSIGNABLE = 1 << 3        /* For non-task assignable backends */
};


static EPopupMenu tasks_popup_menu [] = {
    E_POPUP_ITEM (N_("_Open"), GTK_SIGNAL_FUNC (e_calendar_table_on_open_task), MASK_SINGLE),
    E_POPUP_ITEM (N_("_Save as..."), GTK_SIGNAL_FUNC (e_calendar_table_on_save_as), MASK_SINGLE),
    E_POPUP_ITEM (N_("_Print..."), GTK_SIGNAL_FUNC (e_calendar_table_on_print_task), MASK_SINGLE),

    E_POPUP_SEPARATOR,
    
    E_POPUP_ITEM (N_("C_ut"), GTK_SIGNAL_FUNC (e_calendar_table_on_cut), MASK_EDITABLE),
    E_POPUP_ITEM (N_("_Copy"), GTK_SIGNAL_FUNC (e_calendar_table_on_copy), 0),
    E_POPUP_ITEM (N_("_Paste"), GTK_SIGNAL_FUNC (e_calendar_table_on_paste), MASK_EDITABLE),

    E_POPUP_SEPARATOR,

    E_POPUP_ITEM (N_("_Assign Task"), GTK_SIGNAL_FUNC (e_calendar_table_on_assign), MASK_SINGLE | MASK_EDITABLE | MASK_ASSIGNABLE),
    E_POPUP_ITEM (N_("_Forward as iCalendar"), GTK_SIGNAL_FUNC (e_calendar_table_on_forward), MASK_SINGLE),
    E_POPUP_ITEM (N_("_Mark as Complete"), GTK_SIGNAL_FUNC (mark_as_complete_cb), MASK_SINGLE | MASK_EDITABLE),
    E_POPUP_ITEM (N_("_Mark Selected Tasks as Complete"), GTK_SIGNAL_FUNC (mark_as_complete_cb), MASK_MULTIPLE | MASK_EDITABLE),
    
    E_POPUP_SEPARATOR,

    E_POPUP_ITEM (N_("_Delete"), GTK_SIGNAL_FUNC (delete_cb), MASK_SINGLE | MASK_EDITABLE),
    E_POPUP_ITEM (N_("_Delete Selected Tasks"), GTK_SIGNAL_FUNC (delete_cb), MASK_MULTIPLE | MASK_EDITABLE),

    E_POPUP_TERMINATOR
};

static gint
e_calendar_table_on_right_click (ETable *table,
                 gint row,
                 gint col,
                 GdkEventButton *event,
                 ECalendarTable *cal_table)
{
    int n_selected;
    int hide_mask = 0;
    int disable_mask = 0;

    n_selected = e_table_selected_count (table);
    if (n_selected <= 0)
        return TRUE;

    if (n_selected == 1)
        hide_mask = MASK_MULTIPLE;
    else
        hide_mask = MASK_SINGLE;

    if (cal_client_is_read_only (calendar_model_get_cal_client (e_calendar_table_get_model (cal_table))))
        disable_mask |= MASK_EDITABLE;

    if (cal_client_get_static_capability (calendar_model_get_cal_client (e_calendar_table_get_model (cal_table)), "no-task-assignment"))
        disable_mask |= MASK_ASSIGNABLE;

    e_popup_menu_run (tasks_popup_menu, (GdkEvent *) event,
              disable_mask, hide_mask, cal_table);

    return TRUE;
}


static void
e_calendar_table_on_open_task (GtkWidget *menuitem,
                   gpointer   data)
{
    ECalendarTable *cal_table;
    CalComponent *comp;

    cal_table = E_CALENDAR_TABLE (data);

    comp = get_selected_comp (cal_table);
    if (comp)
        open_task (cal_table, comp, FALSE);
}

static void
e_calendar_table_on_save_as (GtkWidget *widget, gpointer data)
{
    ECalendarTable *cal_table;
    CalClient *client;
    CalComponent *comp;
    char *filename;
    char *ical_string;
    FILE *file;

    cal_table = E_CALENDAR_TABLE (data);

    client = calendar_model_get_cal_client (cal_table->model);
    comp = get_selected_comp (cal_table);
    if (comp == NULL)
        return;
    
    filename = e_file_dialog_save (_("Save as..."));
    if (filename == NULL)
        return;
    
    ical_string = cal_client_get_component_as_string (client, comp);
    if (ical_string == NULL) {
        g_warning ("Couldn't convert item to a string");
        return;
    }
    
    file = fopen (filename, "w");
    if (file == NULL) {
        g_warning ("Couldn't save item");
        return;
    }
    
    fprintf (file, ical_string);
    g_free (ical_string);
    fclose (file);
}

static void
e_calendar_table_on_print_task (GtkWidget *widget, gpointer data)
{
    ECalendarTable *cal_table;
    CalClient *client;
    CalComponent *comp;

    cal_table = E_CALENDAR_TABLE (data);

    client = calendar_model_get_cal_client (cal_table->model);
    comp = get_selected_comp (cal_table);
    if (comp == NULL)
        return;
    
    print_comp (comp, client, FALSE);
}

static void
e_calendar_table_on_cut (GtkWidget *menuitem, gpointer data)
{
    ECalendarTable *cal_table;

    cal_table = E_CALENDAR_TABLE (data);
    e_calendar_table_cut_clipboard (cal_table);
}

static void
e_calendar_table_on_copy (GtkWidget *menuitem, gpointer data)
{
    ECalendarTable *cal_table;

    cal_table = E_CALENDAR_TABLE (data);
    e_calendar_table_copy_clipboard (cal_table);
}

static void
e_calendar_table_on_paste (GtkWidget *menuitem, gpointer data)
{
    ECalendarTable *cal_table;

    cal_table = E_CALENDAR_TABLE (data);
    e_calendar_table_paste_clipboard (cal_table);
}

static void
e_calendar_table_on_assign (GtkWidget *widget, gpointer data)
{
    ECalendarTable *cal_table;
    CalComponent *comp;

    cal_table = E_CALENDAR_TABLE (data);

    comp = get_selected_comp (cal_table);
    if (comp)
        open_task (cal_table, comp, TRUE);
}

static void
e_calendar_table_on_forward (GtkWidget *widget, gpointer data)
{
    ECalendarTable *cal_table;
    CalClient *client;
    CalComponent *comp;

    cal_table = E_CALENDAR_TABLE (data);

    client = calendar_model_get_cal_client (cal_table->model);
    comp = get_selected_comp (cal_table);
    if (comp)
        itip_send_comp (CAL_COMPONENT_METHOD_PUBLISH, comp,
                client, NULL);
}

static gint
e_calendar_table_on_key_press (ETable *table,
                   gint row,
                   gint col,
                   GdkEventKey *event,
                   ECalendarTable *cal_table)
{
    if (event->keyval == GDK_Delete) {
        delete_cb (NULL, cal_table);
        return TRUE;
    }

    return FALSE;
}

/* Loads the state of the table (headers shown etc.) from the given file. */
void
e_calendar_table_load_state (ECalendarTable *cal_table,
                 gchar      *filename)
{
    struct stat st;

    g_return_if_fail (E_IS_CALENDAR_TABLE (cal_table));

    if (stat (filename, &st) == 0 && st.st_size > 0
        && S_ISREG (st.st_mode)) {
        e_table_load_state (e_table_scrolled_get_table(E_TABLE_SCROLLED (cal_table->etable)), filename);
    }
}


/* Saves the state of the table (headers shown etc.) to the given file. */
void
e_calendar_table_save_state (ECalendarTable *cal_table,
                 gchar      *filename)
{
    g_return_if_fail (E_IS_CALENDAR_TABLE (cal_table));

    e_table_save_state (e_table_scrolled_get_table(E_TABLE_SCROLLED (cal_table->etable)),
                filename);
}


static void
invisible_destroyed (GtkWidget *invisible, ECalendarTable *cal_table)
{
    cal_table->invisible = NULL;
}

static void
selection_get (GtkWidget *invisible,
           GtkSelectionData *selection_data,
           guint info,
           guint time_stamp,
           ECalendarTable *cal_table)
{
    if (cal_table->clipboard_selection != NULL) {
        gtk_selection_data_set (selection_data,
                    GDK_SELECTION_TYPE_STRING,
                    8,
                    cal_table->clipboard_selection,
                    strlen (cal_table->clipboard_selection));
    }
}

static void
selection_clear_event (GtkWidget *invisible,
               GdkEventSelection *event,
               ECalendarTable *cal_table)
{
    if (cal_table->clipboard_selection != NULL) {
        g_free (cal_table->clipboard_selection);
        cal_table->clipboard_selection = NULL;
    }
}

static void
selection_received (GtkWidget *invisible,
            GtkSelectionData *selection_data,
            guint time,
            ECalendarTable *cal_table)
{
    char *comp_str;
    icalcomponent *icalcomp;
    char *uid;
    CalComponent *comp;
    icalcomponent_kind kind;

    g_return_if_fail (E_IS_CALENDAR_TABLE (cal_table));

    if (selection_data->length < 0 ||
        selection_data->type != GDK_SELECTION_TYPE_STRING) {
        return;
    }

    comp_str = (char *) selection_data->data;
    icalcomp = icalparser_parse_string ((const char *) comp_str);
    if (!icalcomp)
        return;

    /* check the type of the component */
    kind = icalcomponent_isa (icalcomp);
    if (kind != ICAL_VCALENDAR_COMPONENT &&
        kind != ICAL_VEVENT_COMPONENT &&
        kind != ICAL_VTODO_COMPONENT &&
        kind != ICAL_VJOURNAL_COMPONENT) {
        return;
    }

    calendar_model_set_status_message (e_calendar_table_get_model (cal_table),
                       _("Updating objects"));

    if (kind == ICAL_VCALENDAR_COMPONENT) {
        icalcomponent_kind child_kind;
        icalcomponent *subcomp;
        icalcomponent *vcal_comp;

        vcal_comp = icalcomp;
        subcomp = icalcomponent_get_first_component (
            vcal_comp, ICAL_ANY_COMPONENT);
        while (subcomp) {
            child_kind = icalcomponent_isa (subcomp);
            if (child_kind == ICAL_VEVENT_COMPONENT ||
                child_kind == ICAL_VTODO_COMPONENT ||
                child_kind == ICAL_VJOURNAL_COMPONENT) {
                CalComponent *tmp_comp;

                uid = cal_component_gen_uid ();
                tmp_comp = cal_component_new ();
                cal_component_set_icalcomponent (
                    tmp_comp, icalcomponent_new_clone (subcomp));
                cal_component_set_uid (tmp_comp, uid);

                cal_client_update_object (
                    calendar_model_get_cal_client (cal_table->model),
                    tmp_comp);
                free (uid);
                g_object_unref (tmp_comp);
            }
            subcomp = icalcomponent_get_next_component (
                vcal_comp, ICAL_ANY_COMPONENT);
        }
    }
    else {
        comp = cal_component_new ();
        cal_component_set_icalcomponent (comp, icalcomp);
        uid = cal_component_gen_uid ();
        cal_component_set_uid (comp, (const char *) uid);
        free (uid);

        cal_client_update_object (
            calendar_model_get_cal_client (cal_table->model),
            comp);
        g_object_unref (comp);
    }

    calendar_model_set_status_message (e_calendar_table_get_model (cal_table), NULL);
}


/* Returns the current time, for the ECellDateEdit items.
   FIXME: Should probably use the timezone of the item rather than the
   current timezone, though that may be difficult to get from here. */
static struct tm
e_calendar_table_get_current_time (ECellDateEdit *ecde, gpointer data)
{
    char *location;
    icaltimezone *zone;
    struct tm tmp_tm = { 0 };
    struct icaltimetype tt;

    /* Get the current timezone. */
    location = calendar_config_get_timezone ();
    zone = icaltimezone_get_builtin_timezone (location);

    tt = icaltime_from_timet_with_zone (time (NULL), FALSE, zone);

    /* Now copy it to the struct tm and return it. */
    tmp_tm.tm_year  = tt.year - 1900;
    tmp_tm.tm_mon   = tt.month - 1;
    tmp_tm.tm_mday  = tt.day;
    tmp_tm.tm_hour  = tt.hour;
    tmp_tm.tm_min   = tt.minute;
    tmp_tm.tm_sec   = tt.second;
    tmp_tm.tm_isdst = -1;

    return tmp_tm;
}


#ifdef TRANSLATORS_ONLY

static char *test[] = {
    N_("Click to add a task")
};

#endif