path: root/calendar/gui/tasks-component.c

/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/* tasks-component.c
 *
 * Copyright (C) 2003  Novell, 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.
 *
 * Author: Rodrigo Moya <rodrigo@ximian.com>
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <errno.h>
#include <string.h>
#include <bonobo/bonobo-control.h>
#include <bonobo/bonobo-i18n.h>
#include <bonobo/bonobo-exception.h>
#include <gconf/gconf-client.h>
#include <libecal/e-cal.h>
#include <libedataserver/e-data-server-util.h>
#include <libedataserverui/e-source-selector.h>
#include <shell/e-user-creatable-items-handler.h>
#include <shell/e-component-view.h>
#include "e-cal-model.h"
#include "e-tasks.h"
#include "tasks-component.h"
#include "tasks-control.h"
#include "e-comp-editor-registry.h"
#include "migration.h"
#include "comp-util.h"
#include "calendar-config.h"
#include "e-cal-popup.h"
#include "common/authentication.h"
#include "dialogs/calendar-setup.h"
#include "dialogs/comp-editor.h"
#include "dialogs/copy-source-dialog.h"
#include "dialogs/task-editor.h"
#include "misc/e-info-label.h"
#include "e-util/e-error.h"
#include "e-util/e-icon-factory.h"

#define CREATE_TASK_ID               "task"
#define CREATE_TASK_ASSIGNED_ID      "task-assigned"
#define CREATE_TASK_LIST_ID          "task-list"

enum DndTargetType {
    DND_TARGET_TYPE_CALENDAR_LIST,
};
#define CALENDAR_TYPE "text/calendar"
#define XCALENDAR_TYPE "text/x-calendar"
#define WEB_BASE_URI "webcal://"
#define PERSONAL_RELATIVE_URI "system"

static GtkTargetEntry drag_types[] = {
    { CALENDAR_TYPE, 0, DND_TARGET_TYPE_CALENDAR_LIST },
    { XCALENDAR_TYPE, 0, DND_TARGET_TYPE_CALENDAR_LIST }
};
static gint num_drag_types = sizeof(drag_types) / sizeof(drag_types[0]);

#define PARENT_TYPE bonobo_object_get_type ()

static BonoboObjectClass *parent_class = NULL;

/* Tasks should have their own registry */
extern ECompEditorRegistry *comp_editor_registry;


typedef struct 
{
    ESourceList *source_list;
    
    GSList *source_selection;
    
    ETasks *tasks;
    ETable *table;
    ETableModel *model;

    EInfoLabel *info_label;
    GtkWidget *source_selector;
    
    BonoboControl *view_control;
    BonoboControl *sidebar_control;
    BonoboControl *statusbar_control;

    GList *notifications;

    EUserCreatableItemsHandler *creatable_items_handler;

    EActivityHandler *activity_handler;
} TasksComponentView;

struct _TasksComponentPrivate {
    char *base_directory;
    char *config_directory;

    ESourceList *source_list;
    GSList *source_selection;

    GList *views;
    
    ECal *create_ecal;
    
    GList *notifications;
};

static void
ensure_sources (TasksComponent *component)
{
    GSList *groups;
    ESourceList *source_list;
    ESourceGroup *group;
    ESourceGroup *on_this_computer;
    ESourceGroup *on_the_web;
    ESource *personal_source;
    char *base_uri, *base_uri_proto;

    on_this_computer = NULL;
    on_the_web = NULL;
    personal_source = NULL;

    if (!e_cal_get_sources (&source_list, E_CAL_SOURCE_TYPE_TODO, NULL)) {
        g_warning ("Could not get addressbook source list from GConf!");
        return;
    }

    base_uri = g_build_filename (tasks_component_peek_base_directory (component),
                     "tasks", "local",
                     NULL);

    base_uri_proto = g_filename_to_uri (base_uri, NULL, NULL);

    groups = e_source_list_peek_groups (source_list);
    if (groups) {
        /* groups are already there, we need to search for things... */
        GSList *g;

        for (g = groups; g; g = g->next) {

            group = E_SOURCE_GROUP (g->data);

            /* compare only file:// part. If user home dir name changes we do not want to create 
               one more group  */

            if (!on_this_computer && !strncmp (base_uri_proto, e_source_group_peek_base_uri (group), 7))
                on_this_computer = group;
            else if (!on_the_web && !strcmp (WEB_BASE_URI, e_source_group_peek_base_uri (group)))
                on_the_web = group;
        }
    }

    if (on_this_computer) {
        /* make sure "Personal" shows up as a source under
           this group */
        GSList *sources = e_source_group_peek_sources (on_this_computer);
        GSList *s;
        for (s = sources; s; s = s->next) {
            ESource *source = E_SOURCE (s->data);
            if (!strcmp (PERSONAL_RELATIVE_URI, e_source_peek_relative_uri (source))) {
                personal_source = source;
                break;
            }
        }
        /* Make sure we have the correct base uri. This can change when user's
           homedir name changes */
        if (strcmp (base_uri_proto, e_source_group_peek_base_uri (on_this_computer))) {
            e_source_group_set_base_uri (on_this_computer, base_uri_proto);

            /* *sigh* . We shouldn't  need this sync call here as set_base_uri
               call results in synching to gconf, but that happens in idle loop
               and too late to prevent user seeing "Can not Open ... because of invalid uri" error.*/
            e_source_list_sync (source_list,NULL);
        }
    }
    else {
        /* create the local source group */
        group = e_source_group_new (_("On This Computer"), base_uri_proto);
        e_source_list_add_group (source_list, group, -1);

        on_this_computer = group;
    }

    if (!personal_source) {
        /* Create the default Person addressbook */
        ESource *source = e_source_new (_("Personal"), PERSONAL_RELATIVE_URI);
        e_source_group_add_source (on_this_computer, source, -1);

        if (!calendar_config_get_primary_tasks () && !calendar_config_get_tasks_selected ()) {
            GSList selected;

            calendar_config_set_primary_tasks (e_source_peek_uid (source));

            selected.data = (gpointer)e_source_peek_uid (source);
            selected.next = NULL;
            calendar_config_set_tasks_selected (&selected);
        }

        e_source_set_color (source, 0xBECEDD);
        personal_source = source;
    }

    if (!on_the_web) {
        /* Create the LDAP source group */
        group = e_source_group_new (_("On The Web"), WEB_BASE_URI);
        e_source_list_add_group (source_list, group, -1);

        on_the_web = group;
    }

    component->priv->source_list = source_list;
    g_free (base_uri_proto);
    g_free (base_uri);
}

/* Utility functions.  */
/* FIXME Some of these are duplicated from calendar-component.c */
static gboolean
is_in_selection (GSList *selection, ESource *source)
{
    GSList *l;
    
    for (l = selection; l; l = l->next) {
        ESource *selected_source = l->data;
        
        if (!strcmp (e_source_peek_uid (selected_source), e_source_peek_uid (source)))
            return TRUE;
    }

    return FALSE;
}

static gboolean
is_in_uids (GSList *uids, ESource *source)
{
    GSList *l;
    
    for (l = uids; l; l = l->next) {
        const char *uid = l->data;
        
        if (!strcmp (uid, e_source_peek_uid (source)))
            return TRUE;
    }

    return FALSE;
}

static void
update_uris_for_selection (TasksComponentView *component_view)
{
    GSList *selection, *l, *uids_selected = NULL;
    
    selection = e_source_selector_get_selection (E_SOURCE_SELECTOR (component_view->source_selector));
    
    for (l = component_view->source_selection; l; l = l->next) {
        ESource *old_selected_source = l->data;

        if (!is_in_selection (selection, old_selected_source))
            e_tasks_remove_todo_source (component_view->tasks, old_selected_source);
    }   
    
    for (l = selection; l; l = l->next) {
        ESource *selected_source = l->data;
        
        e_tasks_add_todo_source (component_view->tasks, selected_source);
        uids_selected = g_slist_append (uids_selected, (char *)e_source_peek_uid (selected_source));
    }

    e_source_selector_free_selection (component_view->source_selection);
    component_view->source_selection = selection;

    /* Save the selection for next time we start up */
    calendar_config_set_tasks_selected (uids_selected);
    g_slist_free (uids_selected);
}

static void
update_uri_for_primary_selection (TasksComponentView *component_view)
{
    ESource *source;
    ECalendarTable *cal_table;
    ETable *etable;

    source = e_source_selector_peek_primary_selection (E_SOURCE_SELECTOR (component_view->source_selector));
    if (!source)
        return;

    /* Set the default */
    e_tasks_set_default_source (component_view->tasks, source);

    cal_table = e_tasks_get_calendar_table (component_view->tasks);
    etable = e_calendar_table_get_table (cal_table);

    tasks_control_sensitize_commands (component_view->view_control, component_view->tasks, e_table_selected_count (etable));
    
    /* Save the selection for next time we start up */
    calendar_config_set_primary_tasks (e_source_peek_uid (source));
}

static void
update_selection (TasksComponentView *component_view)
{
    GSList *selection, *uids_selected, *l;

    /* Get the selection in gconf */
    uids_selected = calendar_config_get_tasks_selected ();

    /* Remove any that aren't there any more */
    selection = e_source_selector_get_selection (E_SOURCE_SELECTOR (component_view->source_selector));

    for (l = selection; l; l = l->next) {
        ESource *source = l->data;

        if (!is_in_uids (uids_selected, source)) 
            e_source_selector_unselect_source (E_SOURCE_SELECTOR (component_view->source_selector), source);
    }
    
    e_source_selector_free_selection (selection);

    /* Make sure the whole selection is there */
    for (l = uids_selected; l; l = l->next) {
        char *uid = l->data;
        ESource *source;

        source = e_source_list_peek_source_by_uid (component_view->source_list, uid);
        if (source) 
            e_source_selector_select_source (E_SOURCE_SELECTOR (component_view->source_selector), source);
        
        g_free (uid);
    }
    g_slist_free (uids_selected);
}

static void
update_primary_selection (TasksComponentView *component_view)
{
    ESource *source = NULL;
    char *uid;

    uid = calendar_config_get_primary_tasks ();
    if (uid) {
        source = e_source_list_peek_source_by_uid (component_view->source_list, uid);
        g_free (uid);
    }
    
    if (source) {
        e_source_selector_set_primary_selection (E_SOURCE_SELECTOR (component_view->source_selector), source);
    } else {
        /* Try to create a default if there isn't one */
        source = e_source_list_peek_source_any (component_view->source_list);
        if (source)
            e_source_selector_set_primary_selection (E_SOURCE_SELECTOR (component_view->source_selector), source);
    }
}

/* Callbacks.  */
static void
copy_task_list_cb (EPopup *ep, EPopupItem *pitem, void *data)
{
    TasksComponentView *component_view = data;
    ESource *selected_source;
    
    selected_source = e_source_selector_peek_primary_selection (E_SOURCE_SELECTOR (component_view->source_selector));
    if (!selected_source)
        return;

    copy_source_dialog (GTK_WINDOW (gtk_widget_get_toplevel(ep->target->widget)), selected_source, E_CAL_SOURCE_TYPE_TODO);
}

static void
delete_task_list_cb (EPopup *ep, EPopupItem *pitem, void *data)
{
    TasksComponentView *component_view = data;
    ESource *selected_source;
    ECal *cal;
    char *uri;

    selected_source = e_source_selector_peek_primary_selection (E_SOURCE_SELECTOR (component_view->source_selector));
    if (!selected_source)
        return;

    if (e_error_run((GtkWindow *)gtk_widget_get_toplevel(ep->target->widget),
            "calendar:prompt-delete-task-list", e_source_peek_name(selected_source)) != GTK_RESPONSE_YES)
        return;

    /* first, ask the backend to remove the task list */
    uri = e_source_get_uri (selected_source);
    cal = e_cal_model_get_client_for_uri (
        e_calendar_table_get_model (E_CALENDAR_TABLE (e_tasks_get_calendar_table (component_view->tasks))),
        uri);
    if (!cal)
        cal = e_cal_new_from_uri (uri, E_CAL_SOURCE_TYPE_TODO);
    g_free (uri);
    if (cal) {
        if (e_cal_remove (cal, NULL)) {
            if (e_source_selector_source_is_selected (E_SOURCE_SELECTOR (component_view->source_selector),
                                  selected_source)) {
                e_tasks_remove_todo_source (component_view->tasks, selected_source);
                e_source_selector_unselect_source (E_SOURCE_SELECTOR (component_view->source_selector),
                                   selected_source);
            }
            
            e_source_group_remove_source (e_source_peek_group (selected_source), selected_source);
            e_source_list_sync (component_view->source_list, NULL);
        }
    }
}

static void
new_task_list_cb (EPopup *ep, EPopupItem *pitem, void *data)
{
    calendar_setup_new_task_list (GTK_WINDOW (gtk_widget_get_toplevel(ep->target->widget)));
}

static void
edit_task_list_cb (EPopup *ep, EPopupItem *pitem, void *data)
{
    TasksComponentView *component_view = data;
    ESource *selected_source;

    selected_source = e_source_selector_peek_primary_selection (E_SOURCE_SELECTOR (component_view->source_selector));
    if (!selected_source)
        return;

    calendar_setup_edit_task_list (GTK_WINDOW (gtk_widget_get_toplevel(ep->target->widget)), selected_source);
}

static EPopupItem etc_source_popups[] = {
    { E_POPUP_ITEM, "10.new", N_("_New Task List"), new_task_list_cb, NULL, "stock_todo", 0, 0 },
    { E_POPUP_ITEM, "15.copy", N_("_Copy"), copy_task_list_cb, NULL, "stock_folder-copy", 0, E_CAL_POPUP_SOURCE_PRIMARY },
    { E_POPUP_ITEM, "20.delete", N_("_Delete"), delete_task_list_cb, NULL, "stock_delete", 0, E_CAL_POPUP_SOURCE_USER|E_CAL_POPUP_SOURCE_PRIMARY },
    { E_POPUP_ITEM, "30.properties", N_("_Properties..."), edit_task_list_cb, NULL, "stock_folder-properties", 0, E_CAL_POPUP_SOURCE_PRIMARY },
};

static void
etc_source_popup_free(EPopup *ep, GSList *list, void *data)
{
    g_slist_free(list);
}

static gboolean
popup_event_cb(ESourceSelector *selector, ESource *insource, GdkEventButton *event, TasksComponentView *component_view)
{
    ECalPopup *ep;
    ECalPopupTargetSource *t;
    GSList *menus = NULL;
    int i;
    GtkMenu *menu;

    /** @HookPoint-ECalPopup: Tasks Source Selector Context Menu
     * @Id: org.gnome.evolution.tasks.source.popup
     * @Class: org.gnome.evolution.calendar.popup:1.0
     * @Target: ECalPopupTargetSource
     *
     * The context menu on the source selector in the tasks window.
     */
    ep = e_cal_popup_new("org.gnome.evolution.tasks.source.popup");
    t = e_cal_popup_target_new_source(ep, selector);
    t->target.widget = (GtkWidget *)component_view->tasks;

    for (i=0;i<sizeof(etc_source_popups)/sizeof(etc_source_popups[0]);i++)
        menus = g_slist_prepend(menus, &etc_source_popups[i]);

    e_popup_add_items((EPopup *)ep, menus, NULL,etc_source_popup_free, component_view);

    menu = e_popup_create_menu_once((EPopup *)ep, (EPopupTarget *)t, 0);
    gtk_menu_popup(menu, NULL, NULL, NULL, NULL, event?event->button:0, event?event->time:gtk_get_current_event_time());

    return TRUE;
}

static void
source_selection_changed_cb (ESourceSelector *selector, TasksComponentView *component_view)
{
    update_uris_for_selection (component_view);
}

static void
primary_source_selection_changed_cb (ESourceSelector *selector, TasksComponentView *component_view)
{
    update_uri_for_primary_selection (component_view);
}

static void
source_added_cb (ETasks *tasks, ESource *source, TasksComponentView *component_view)
{
    e_source_selector_select_source (E_SOURCE_SELECTOR (component_view->source_selector), source);
}

static void
source_removed_cb (ETasks *tasks, ESource *source, TasksComponentView *component_view)
{
    e_source_selector_unselect_source (E_SOURCE_SELECTOR (component_view->source_selector), source);
}

static void
set_info (TasksComponentView *component_view)
{
    GString *message = g_string_new ("");
    int rows, selected_rows;
    
    rows = e_table_model_row_count (component_view->model);
    selected_rows =  e_table_selected_count (component_view->table);

    g_string_append_printf(message, ngettext("%d task", "%d tasks", rows), rows);
    if (selected_rows > 0)
        g_string_append_printf(message, ngettext(", %d selected", ", %d selected", selected_rows), selected_rows);

    e_info_label_set_info (component_view->info_label, _("Tasks"), message->str);

    g_string_free (message, TRUE);
}

static void
table_selection_change_cb (ETableModel *etm, TasksComponentView *component_view)
{
    set_info (component_view);
}

static void
model_changed_cb (ETableModel *etm, TasksComponentView *component_view)
{
    set_info (component_view);
}

static void
model_rows_inserted_cb (ETableModel *etm, int row, int count, TasksComponentView *component_view)
{
    set_info (component_view);
}

static void
model_rows_deleted_cb (ETableModel *etm, int row, int count, TasksComponentView *component_view)
{
    set_info (component_view);
}

/* Evolution::Component CORBA methods */

static void
impl_upgradeFromVersion (PortableServer_Servant servant,
             CORBA_short major,
             CORBA_short minor,
             CORBA_short revision,
             CORBA_Environment *ev)
{
    GError *err = NULL;
    TasksComponent *component = TASKS_COMPONENT (bonobo_object_from_servant (servant));

    if (!migrate_tasks(component, major, minor, revision, &err)) {
        GNOME_Evolution_Component_UpgradeFailed *failedex;

        failedex = GNOME_Evolution_Component_UpgradeFailed__alloc();
        failedex->what = CORBA_string_dup(_("Failed upgrading tasks."));
        failedex->why = CORBA_string_dup(err->message);
        CORBA_exception_set(ev, CORBA_USER_EXCEPTION, ex_GNOME_Evolution_Component_UpgradeFailed, failedex);
    }

    if (err)
        g_error_free(err);
}

static gboolean
selector_tree_drag_drop (GtkWidget *widget, 
             GdkDragContext *context, 
             int x, 
             int y, 
             guint time, 
             CalendarComponent *component)
{
    GtkTreeViewColumn *column;
    int cell_x;
    int cell_y;
    GtkTreePath *path;
    GtkTreeModel *model;
    GtkTreeIter iter;
    gpointer data;
    
    if (!gtk_tree_view_get_path_at_pos  (GTK_TREE_VIEW (widget), x, y, &path, 
                         &column, &cell_x, &cell_y))
        return FALSE;
    
    
    model = gtk_tree_view_get_model (GTK_TREE_VIEW (widget));

    if (!gtk_tree_model_get_iter (model, &iter, path)) {
        gtk_tree_path_free (path);
        return FALSE;
    }

    gtk_tree_model_get (model, &iter, 0, &data, -1);
    
    if (E_IS_SOURCE_GROUP (data)) {
        g_object_unref (data);
        gtk_tree_path_free (path);
        return FALSE;
    }
    
    gtk_tree_path_free (path);
    return TRUE;
}
    
static gboolean
selector_tree_drag_motion (GtkWidget *widget,
               GdkDragContext *context,
               int x,
               int y,
               guint time,
               gpointer user_data)
{
    GtkTreePath *path = NULL;
    gpointer data = NULL;
    GtkTreeViewDropPosition pos;
    GtkTreeModel *model;
    GtkTreeIter iter;
    GdkDragAction action = GDK_ACTION_DEFAULT;
    
    if (!gtk_tree_view_get_dest_row_at_pos (GTK_TREE_VIEW (widget),
                        x, y, &path, &pos))
        goto finish;
    
    model = gtk_tree_view_get_model (GTK_TREE_VIEW (widget));
    
    if (!gtk_tree_model_get_iter (model, &iter, path))
        goto finish;
    
    gtk_tree_model_get (model, &iter, 0, &data, -1);

    if (E_IS_SOURCE_GROUP (data) || e_source_get_readonly (data))
        goto finish;
    
    gtk_tree_view_set_drag_dest_row(GTK_TREE_VIEW (widget), path, GTK_TREE_VIEW_DROP_INTO_OR_BEFORE);
    action = context->suggested_action;
    if (action == GDK_ACTION_COPY && (context->actions & GDK_ACTION_MOVE))
        action=GDK_ACTION_MOVE;

 finish:
    if (path)
        gtk_tree_path_free (path);
    if (data)
        g_object_unref (data);

    gdk_drag_status (context, action, time);
    return TRUE;
}

static gboolean
update_single_object (ECal *client, icalcomponent *icalcomp)
{
    char *uid;
    icalcomponent *tmp_icalcomp;

    uid = (char *) icalcomponent_get_uid (icalcomp);
    
    if (e_cal_get_object (client, uid, NULL, &tmp_icalcomp, NULL))
        return e_cal_modify_object (client, icalcomp, CALOBJ_MOD_ALL, NULL);

    return e_cal_create_object (client, icalcomp, &uid, NULL);  
}

static gboolean
update_objects (ECal *client, icalcomponent *icalcomp)
{
    icalcomponent *subcomp;
    icalcomponent_kind kind;

    kind = icalcomponent_isa (icalcomp);
    if (kind == ICAL_VTODO_COMPONENT || kind == ICAL_VEVENT_COMPONENT)
        return update_single_object (client, icalcomp);
    else if (kind != ICAL_VCALENDAR_COMPONENT)
        return FALSE;

    subcomp = icalcomponent_get_first_component (icalcomp, ICAL_ANY_COMPONENT);
    while (subcomp) {
        gboolean success;
        
        kind = icalcomponent_isa (subcomp);
        if (kind == ICAL_VTIMEZONE_COMPONENT) {
            icaltimezone *zone;

            zone = icaltimezone_new ();
            icaltimezone_set_component (zone, subcomp);

            success = e_cal_add_timezone (client, zone, NULL);
            icaltimezone_free (zone, 1);
            if (!success)
                return success;
        } else if (kind == ICAL_VTODO_COMPONENT ||
               kind == ICAL_VEVENT_COMPONENT) {
            success = update_single_object (client, subcomp);
            if (!success)
                return success;
        }

        subcomp = icalcomponent_get_next_component (icalcomp, ICAL_ANY_COMPONENT);
    }

    return TRUE;
}

static void
selector_tree_drag_data_received (GtkWidget *widget, 
                  GdkDragContext *context, 
                  gint x, 
                  gint y, 
                  GtkSelectionData *data,
                  guint info,
                  guint time,
                  gpointer user_data)
{
    GtkTreePath *path = NULL;
    GtkTreeViewDropPosition pos;
    gpointer source = NULL;
    GtkTreeModel *model;
    GtkTreeIter iter;
    gboolean success = FALSE;
    icalcomponent *icalcomp = NULL;
    ECal *client = NULL;

    if (!gtk_tree_view_get_dest_row_at_pos (GTK_TREE_VIEW (widget),
                        x, y, &path, &pos))
        goto finish;
    
    model = gtk_tree_view_get_model (GTK_TREE_VIEW (widget));
    
    if (!gtk_tree_model_get_iter (model, &iter, path))
        goto finish;
       
    
    gtk_tree_model_get (model, &iter, 0, &source, -1);

    if (E_IS_SOURCE_GROUP (source) || e_source_get_readonly (source))
        goto finish;

    icalcomp = icalparser_parse_string (data->data);

    if (icalcomp) {
        const char * uid;
        
        /* FIXME deal with GDK_ACTION_ASK */
        if (context->action == GDK_ACTION_COPY) {
            uid = e_cal_component_gen_uid ();
            icalcomponent_set_uid (icalcomp, uid);
        }

        client = auth_new_cal_from_source (source, 
                           E_CAL_SOURCE_TYPE_TODO);
        
        if (client) {
            if (e_cal_open (client, TRUE, NULL)) {
                icalcomponent *tmp_icalcomp = NULL;
                GError *error = NULL;
                uid = icalcomponent_get_uid (icalcomp);
                if (!e_cal_get_object (client, uid, NULL, &tmp_icalcomp, &error)) {
                        if ((error != NULL) && (error->code != E_CALENDAR_STATUS_OBJECT_NOT_FOUND))
                         g_message ("Failed to search the object in destination task list: %s",error->message);
                    else {
                        success = TRUE;
                        update_objects (client, icalcomp);
                    }

                    g_clear_error (&error);
                } else 
                    icalcomponent_free (tmp_icalcomp);
            }

            g_object_unref (client);
        }

        icalcomponent_free (icalcomp);
    }

 finish:
    if (source)
        g_object_unref (source);
    if (path)
        gtk_tree_path_free (path);

    gtk_drag_finish (context, success, context->action == GDK_ACTION_MOVE, time);
}   

static void
selector_tree_drag_leave (GtkWidget *widget, GdkDragContext *context, guint time, gpointer data)
{
    gtk_tree_view_set_drag_dest_row(GTK_TREE_VIEW (widget), 
                    NULL, GTK_TREE_VIEW_DROP_BEFORE);
}


static void
control_activate_cb (BonoboControl *control, gboolean activate, gpointer data)
{
    TasksComponentView *component_view = data;

    if (activate) {
        BonoboUIComponent *uic;
        uic = bonobo_control_get_ui_component (component_view->view_control);
        
        e_user_creatable_items_handler_activate (component_view->creatable_items_handler, uic);
    }   
}

static void
config_create_ecal_changed_cb (GConfClient *client, guint id, GConfEntry *entry, gpointer data)
{   
    TasksComponent *component = data;
    TasksComponentPrivate *priv;
    
    priv = component->priv;

    g_object_unref (priv->create_ecal);
    priv->create_ecal = NULL;
    
    priv->notifications = g_list_remove (priv->notifications, GUINT_TO_POINTER (id));
}

static ECal *
setup_create_ecal (TasksComponent *component, TasksComponentView *component_view) 
{
    TasksComponentPrivate *priv;
    ESource *source = NULL;
    char *uid;
    guint not;
    
    priv = component->priv;

    if (component_view) {
        ECal *default_ecal;

        default_ecal = e_tasks_get_default_client (component_view->tasks);
        if (default_ecal)
            return default_ecal;
    }
    
    if (priv->create_ecal)
        return priv->create_ecal; 
    
    /* Get the current primary calendar, or try to set one if it doesn't already exist */       
    uid = calendar_config_get_primary_tasks ();
    if (uid) {
        source = e_source_list_peek_source_by_uid (priv->source_list, uid);
        g_free (uid);

        priv->create_ecal = auth_new_cal_from_source (source, E_CAL_SOURCE_TYPE_TODO);
    } 

    if (!priv->create_ecal) {
        /* Try to create a default if there isn't one */
        source = e_source_list_peek_source_any (priv->source_list);
        if (source)
            priv->create_ecal = auth_new_cal_from_source (source, E_CAL_SOURCE_TYPE_TODO);
    }
        
    if (priv->create_ecal) {
        icaltimezone *zone;
        
        zone = calendar_config_get_icaltimezone ();
        e_cal_set_default_timezone (priv->create_ecal, zone, NULL);

        if (!e_cal_open (priv->create_ecal, FALSE, NULL)) {
            GtkWidget *dialog;
            
            dialog = gtk_message_dialog_new (NULL, GTK_DIALOG_MODAL,
                             GTK_MESSAGE_WARNING, GTK_BUTTONS_OK,
                             _("Unable to open the task list '%s' for creating events and meetings"), 
                             e_source_peek_name (source));
            gtk_dialog_run (GTK_DIALOG (dialog));
            gtk_widget_destroy (dialog);

            return NULL;
        }

    } else {
        GtkWidget *dialog;
            
        dialog = gtk_message_dialog_new (NULL, GTK_DIALOG_MODAL,
                         GTK_MESSAGE_WARNING, GTK_BUTTONS_OK,
                         _("There is no calendar available for creating tasks"));
        gtk_dialog_run (GTK_DIALOG (dialog));
        gtk_widget_destroy (dialog);

        return NULL;
    }       

    /* Handle the fact it may change on us */
    not = calendar_config_add_notification_primary_tasks (config_create_ecal_changed_cb, 
                                  component);
    priv->notifications = g_list_prepend (priv->notifications, GUINT_TO_POINTER (not));

    /* Save the primary source for use elsewhere */
    calendar_config_set_primary_tasks (e_source_peek_uid (source));

    return priv->create_ecal ;
}

static gboolean
create_new_todo (TasksComponent *task_component, gboolean is_assigned, TasksComponentView *component_view)
{
    ECal *ecal;
    ECalComponent *comp;
    TaskEditor *editor;
    guint32 flags = 0;  
    
    ecal = setup_create_ecal (task_component, component_view);
    if (!ecal)
        return FALSE;

    if (is_assigned)
        flags |= COMP_EDITOR_IS_ASSIGNED;
    
    flags |= COMP_EDITOR_NEW_ITEM | COMP_EDITOR_USER_ORG;

    editor = task_editor_new (ecal, flags);
    comp = cal_comp_task_new_with_defaults (ecal);

    comp_editor_edit_comp (COMP_EDITOR (editor), comp);
    if (is_assigned)
        task_editor_show_assignment (editor);
    comp_editor_focus (COMP_EDITOR (editor));

    e_comp_editor_registry_add (comp_editor_registry, COMP_EDITOR (editor), TRUE);

    return TRUE;
}

static void
create_local_item_cb (EUserCreatableItemsHandler *handler, const char *item_type_name, void *data)
{
    TasksComponent *tasks_component = data;
    TasksComponentPrivate *priv;
    TasksComponentView *component_view = NULL;
    GList *l;
    
    priv = tasks_component->priv;
    
    for (l = priv->views; l; l = l->next) {
        component_view = l->data;

        if (component_view->creatable_items_handler == handler)
            break;
        
        component_view = NULL;
    }
    
    if (strcmp (item_type_name, CREATE_TASK_ID) == 0) {
        create_new_todo (tasks_component, FALSE, component_view);
    } else if (strcmp (item_type_name, CREATE_TASK_ASSIGNED_ID) == 0) {
        create_new_todo (tasks_component, TRUE, component_view);
    } else if (strcmp (item_type_name, CREATE_TASK_LIST_ID) == 0) {
        calendar_setup_new_task_list (GTK_WINDOW (gtk_widget_get_toplevel (GTK_WIDGET (component_view->tasks))));
    }
}

static TasksComponentView *
create_component_view (TasksComponent *tasks_component)
{
    TasksComponentPrivate *priv;
    TasksComponentView *component_view;
    GtkWidget *selector_scrolled_window, *vbox;
    GtkWidget *statusbar_widget;
    AtkObject *a11y;
    
    priv = tasks_component->priv;

    /* Create the calendar component view */
    component_view = g_new0 (TasksComponentView, 1);
    
    /* Add the source lists */
    component_view->source_list = g_object_ref (priv->source_list);
    
    /* Create sidebar selector */
    component_view->source_selector = e_source_selector_new (tasks_component->priv->source_list);
    e_source_selector_set_select_new ((ESourceSelector *)component_view->source_selector, TRUE);
    a11y = gtk_widget_get_accessible (GTK_WIDGET (component_view->source_selector));
    atk_object_set_name (a11y, _("Task Source Selector"));

    g_signal_connect (component_view->source_selector, "drag-motion", G_CALLBACK (selector_tree_drag_motion), 
              tasks_component);
    g_signal_connect (component_view->source_selector, "drag-leave", G_CALLBACK (selector_tree_drag_leave), 
              tasks_component);
    g_signal_connect (component_view->source_selector, "drag-drop", G_CALLBACK (selector_tree_drag_drop), 
              tasks_component);
    g_signal_connect (component_view->source_selector, "drag-data-received", 
              G_CALLBACK (selector_tree_drag_data_received), tasks_component);

    gtk_drag_dest_set(component_view->source_selector, GTK_DEST_DEFAULT_ALL, drag_types,
              num_drag_types, GDK_ACTION_COPY | GDK_ACTION_MOVE);

    gtk_widget_show (component_view->source_selector);

    selector_scrolled_window = gtk_scrolled_window_new (NULL, NULL);
    gtk_container_add (GTK_CONTAINER (selector_scrolled_window), component_view->source_selector);
    gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (selector_scrolled_window),
                    GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);
    gtk_scrolled_window_set_shadow_type (GTK_SCROLLED_WINDOW (selector_scrolled_window),
                         GTK_SHADOW_IN);
    gtk_widget_show (selector_scrolled_window);

    component_view->info_label = (EInfoLabel *)e_info_label_new("stock_task");
    e_info_label_set_info(component_view->info_label, _("Tasks"), "");
    gtk_widget_show (GTK_WIDGET (component_view->info_label));

    vbox = gtk_vbox_new(FALSE, 0);
    gtk_box_pack_start(GTK_BOX (vbox), GTK_WIDGET (component_view->info_label), FALSE, TRUE, 0);
    gtk_box_pack_start(GTK_BOX (vbox), selector_scrolled_window, TRUE, TRUE, 0);
    gtk_widget_show (vbox);

    component_view->sidebar_control = bonobo_control_new (vbox);

    /* Create main view */
    component_view->view_control = tasks_control_new ();
    if (!component_view->view_control) {
        /* FIXME free memory */

        return NULL;
    }

    component_view->tasks = (ETasks *) bonobo_control_get_widget (component_view->view_control);
    component_view->table = e_calendar_table_get_table (e_tasks_get_calendar_table (component_view->tasks));
    component_view->model = E_TABLE_MODEL (e_calendar_table_get_model (e_tasks_get_calendar_table (component_view->tasks)));

    /* This signal is thrown if backends die - we update the selector */
    g_signal_connect (component_view->tasks, "source_added", 
              G_CALLBACK (source_added_cb), component_view);
    g_signal_connect (component_view->tasks, "source_removed", 
              G_CALLBACK (source_removed_cb), component_view);

    /* Create status bar */
    statusbar_widget = e_task_bar_new ();
    component_view->activity_handler = e_activity_handler_new ();
    e_activity_handler_attach_task_bar (component_view->activity_handler, E_TASK_BAR (statusbar_widget));
    gtk_widget_show (statusbar_widget);

    component_view->statusbar_control = bonobo_control_new (statusbar_widget);
    
    e_calendar_table_set_activity_handler (e_tasks_get_calendar_table (component_view->tasks), component_view->activity_handler);
    
    /* connect after setting the initial selections, or we'll get unwanted calls
       to calendar_control_sensitize_calendar_commands */
    g_signal_connect (component_view->source_selector, "selection_changed",
              G_CALLBACK (source_selection_changed_cb), component_view);
    g_signal_connect (component_view->source_selector, "primary_selection_changed",
              G_CALLBACK (primary_source_selection_changed_cb), component_view);
    g_signal_connect (component_view->source_selector, "popup_event",
              G_CALLBACK (popup_event_cb), component_view);

    /* Set up the "new" item handler */
    component_view->creatable_items_handler = e_user_creatable_items_handler_new ("tasks", create_local_item_cb, tasks_component);
    g_signal_connect (component_view->view_control, "activate", G_CALLBACK (control_activate_cb), component_view);

    /* We use this to update the component information */
    set_info (component_view);
    g_signal_connect (component_view->table, "selection_change",
              G_CALLBACK (table_selection_change_cb), component_view);
    g_signal_connect (component_view->model, "model_changed", 
              G_CALLBACK (model_changed_cb), component_view);
    g_signal_connect (component_view->model, "model_rows_inserted",
              G_CALLBACK (model_rows_inserted_cb), component_view);
    g_signal_connect (component_view->model, "model_rows_deleted",
              G_CALLBACK (model_rows_deleted_cb), component_view);

    /* Load the selection from the last run */
    update_selection (component_view);  
    update_primary_selection (component_view);

    return component_view;
}

static void
destroy_component_view (TasksComponentView *component_view)
{   
    GList *l;
    
    if (component_view->source_list)
        g_object_unref (component_view->source_list);

    if (component_view->source_selection)
        e_source_selector_free_selection (component_view->source_selection);
    
    for (l = component_view->notifications; l; l = l->next)
        calendar_config_remove_notification (GPOINTER_TO_UINT (l->data));
    g_list_free (component_view->notifications);

    if (component_view->creatable_items_handler)
        g_object_unref (component_view->creatable_items_handler);

    if (component_view->activity_handler)
        g_object_unref (component_view->activity_handler);

    g_free (component_view);
}

static void
view_destroyed_cb (gpointer data, GObject *where_the_object_was)
{
    TasksComponent *tasks_component = data;
    TasksComponentPrivate *priv;
    GList *l;
    
    priv = tasks_component->priv;

    for (l = priv->views; l; l = l->next) {
        TasksComponentView *component_view = l->data;
        
        if (G_OBJECT (component_view->view_control) == where_the_object_was) {
            priv->views = g_list_remove (priv->views, component_view);
            destroy_component_view (component_view);

            break;
        }
    }
}

static GNOME_Evolution_ComponentView
impl_createView (PortableServer_Servant servant,
         GNOME_Evolution_ShellView parent,
         CORBA_Environment *ev)
{
    TasksComponent *component = TASKS_COMPONENT (bonobo_object_from_servant (servant));
    TasksComponentPrivate *priv;
    TasksComponentView *component_view;
    EComponentView *ecv;
    
    priv = component->priv;

    /* Create the calendar component view */
    component_view = create_component_view (component);
    if (!component_view) {
        /* FIXME Should we describe the problem in a control? */
        bonobo_exception_set (ev, ex_GNOME_Evolution_Component_Failed);

        return CORBA_OBJECT_NIL;
    }

    g_object_weak_ref (G_OBJECT (component_view->view_control), view_destroyed_cb, component);
    priv->views = g_list_append (priv->views, component_view);
    
    /* TODO: Make TasksComponentView just subclass EComponentView */
    ecv = e_component_view_new_controls (parent, "tasks", component_view->sidebar_control,
                         component_view->view_control, component_view->statusbar_control);

    return BONOBO_OBJREF(ecv);
}

static GNOME_Evolution_CreatableItemTypeList *
impl__get_userCreatableItems (PortableServer_Servant servant,
                  CORBA_Environment *ev)
{
    GNOME_Evolution_CreatableItemTypeList *list = GNOME_Evolution_CreatableItemTypeList__alloc ();

    list->_length  = 3;
    list->_maximum = list->_length;
    list->_buffer  = GNOME_Evolution_CreatableItemTypeList_allocbuf (list->_length);

    CORBA_sequence_set_release (list, FALSE);

    list->_buffer[0].id = CREATE_TASK_ID;
    list->_buffer[0].description = _("New task");
    list->_buffer[0].menuDescription = _("_Task");
    list->_buffer[0].tooltip = _("Create a new task");
    list->_buffer[0].menuShortcut = 't';
    list->_buffer[0].iconName = "stock_task";
    list->_buffer[0].type = GNOME_Evolution_CREATABLE_OBJECT;

    list->_buffer[1].id = CREATE_TASK_ASSIGNED_ID;
    list->_buffer[1].description = _("New assigned task");
    list->_buffer[1].menuDescription = _("Assigne_d Task");
    list->_buffer[1].tooltip = _("Create a new assigned task");
    list->_buffer[1].menuShortcut = '\0';
    list->_buffer[1].iconName = "stock_task";
    list->_buffer[1].type = GNOME_Evolution_CREATABLE_OBJECT;

    list->_buffer[2].id = CREATE_TASK_LIST_ID;
    list->_buffer[2].description = _("New task list");
    list->_buffer[2].menuDescription = _("Task l_ist");
    list->_buffer[2].tooltip = _("Create a new task list");
    list->_buffer[2].menuShortcut = '\0';
    list->_buffer[2].iconName = "stock_todo";
    list->_buffer[2].type = GNOME_Evolution_CREATABLE_FOLDER;

    return list;
}

static void
impl_requestCreateItem (PortableServer_Servant servant,
            const CORBA_char *item_type_name,
            CORBA_Environment *ev)
{
    TasksComponent *tasks_component = TASKS_COMPONENT (bonobo_object_from_servant (servant));
    
    if (strcmp (item_type_name, CREATE_TASK_ID) == 0) {
        if (!create_new_todo (tasks_component, FALSE, NULL))
            bonobo_exception_set (ev, ex_GNOME_Evolution_Component_Failed);
    } else if (strcmp (item_type_name, CREATE_TASK_ASSIGNED_ID) == 0) {
        if (!create_new_todo (tasks_component, TRUE, NULL))
            bonobo_exception_set (ev, ex_GNOME_Evolution_Component_Failed);
    } else if (strcmp (item_type_name, CREATE_TASK_LIST_ID) == 0) {
        /* FIXME Should we use the last opened window? */
        calendar_setup_new_task_list (NULL);
    } else {
        bonobo_exception_set (ev, ex_GNOME_Evolution_Component_UnknownType);
    }
}

/* GObject methods.  */

static void
impl_dispose (GObject *object)
{
    TasksComponent *tasks_component = TASKS_COMPONENT (object);
    TasksComponentPrivate *priv = tasks_component->priv;
    GList *l;
    
    if (priv->source_list != NULL) {
        g_object_unref (priv->source_list);
        priv->source_list = NULL;
    }
    if (priv->source_selection != NULL) {
        e_source_selector_free_selection (priv->source_selection);
        priv->source_selection = NULL;
    }

    if (priv->create_ecal) {
        g_object_unref (priv->create_ecal);
        priv->create_ecal = NULL;
    }

    for (l = priv->views; l; l = l->next) {
        TasksComponentView *component_view = l->data;
    
        g_object_weak_unref (G_OBJECT (component_view->view_control), view_destroyed_cb, tasks_component);
    }
    g_list_free (priv->views);
    priv->views = NULL;

    for (l = priv->notifications; l; l = l->next)
        calendar_config_remove_notification (GPOINTER_TO_UINT (l->data));
    g_list_free (priv->notifications);
    priv->notifications = NULL;

    (* G_OBJECT_CLASS (parent_class)->dispose) (object);
}

static void
impl_finalize (GObject *object)
{
    TasksComponentPrivate *priv = TASKS_COMPONENT (object)->priv;
    GList *l;
    
    for (l = priv->views; l; l = l->next) {
        TasksComponentView *component_view = l->data;
        
        destroy_component_view (component_view);
    }
    g_list_free (priv->views);

    g_free (priv->base_directory);
    g_free (priv->config_directory);
    g_free (priv);

    (* G_OBJECT_CLASS (parent_class)->finalize) (object);
}

static void
tasks_component_class_init (TasksComponentClass *klass)
{
    POA_GNOME_Evolution_Component__epv *epv = &klass->epv;
    GObjectClass *object_class = G_OBJECT_CLASS (klass);

    parent_class = g_type_class_peek_parent (klass);

    epv->upgradeFromVersion      = impl_upgradeFromVersion;
    epv->createView          = impl_createView;
    epv->_get_userCreatableItems = impl__get_userCreatableItems;
    epv->requestCreateItem       = impl_requestCreateItem;

    object_class->dispose = impl_dispose;
    object_class->finalize = impl_finalize;
}

static void
tasks_component_init (TasksComponent *component, TasksComponentClass *klass)
{
    TasksComponentPrivate *priv;

    priv = g_new0 (TasksComponentPrivate, 1);

    priv->base_directory = g_build_filename (g_get_home_dir (), ".evolution", NULL);
    priv->config_directory = g_build_filename (g_get_home_dir (),
                           ".evolution", "tasks", "config",
                           NULL);
    
    component->priv = priv;
    ensure_sources (component);
}

/* Public API */

TasksComponent *
tasks_component_peek (void)
{
    static TasksComponent *component = NULL;

    if (component == NULL) {
        component = g_object_new (tasks_component_get_type (), NULL);

        if (e_util_mkdir_hier (component->priv->config_directory, 0777) != 0) {
            g_warning (G_STRLOC ": Cannot create directory %s: %s",
                   component->priv->config_directory, g_strerror (errno));
            g_object_unref (component);
            component = NULL;
        }
    }

    return component;
}

const char *
tasks_component_peek_base_directory (TasksComponent *component)
{
    return component->priv->base_directory;
}

const char *
tasks_component_peek_config_directory (TasksComponent *component)
{
    return component->priv->config_directory;
}

ESourceList *
tasks_component_peek_source_list (TasksComponent *component)
{
    return component->priv->source_list;    
}

BONOBO_TYPE_FUNC_FULL (TasksComponent, GNOME_Evolution_Component, PARENT_TYPE, tasks_component)