path: root/calendar/gui/dialogs/memo-page.c

/*
 * Evolution calendar - Main page of the memo editor dialog
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) version 3.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the program; if not, see <http://www.gnu.org/licenses/>
 *
 *
 * Authors:
 *      Federico Mena-Quintero <federico@ximian.com>
 *      Miguel de Icaza <miguel@ximian.com>
 *      Seth Alves <alves@hungry.com>
 *      JP Rosevear <jpr@ximian.com>
 *      Nathan Owens <pianocomp81@yahoo.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

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

#include <string.h>
#include <gtk/gtk.h>
#include <glib/gi18n.h>
#include <libedataserverui/e-category-completion.h>
#include <libedataserverui/e-source-combo-box.h>
#include <libedataserverui/e-name-selector.h>
#include <libedataserverui/e-name-selector-entry.h>
#include <libedataserverui/e-name-selector-list.h>
#include <widgets/misc/e-dateedit.h>
#include "misc/e-buffer-tagger.h"

#include "e-util/e-util.h"
#include "e-util/e-categories-config.h"
#include "e-util/e-dialog-utils.h"
#include "e-util/e-dialog-widgets.h"
#include "e-util/e-util-private.h"

#include "common/authentication.h"
#include "../calendar-config.h"
#include "comp-editor.h"
#include "comp-editor-util.h"
#include "e-send-options-utils.h"
#include "memo-page.h"

#define MEMO_PAGE_GET_PRIVATE(obj) \
    (G_TYPE_INSTANCE_GET_PRIVATE \
    ((obj), TYPE_MEMO_PAGE, MemoPagePrivate))

/* Private part of the MemoPage structure */
struct _MemoPagePrivate {
    GtkBuilder *builder;

    /* Widgets from the UI file */
    GtkWidget *main;

    GtkWidget *memo_content;

    EAccountList *accounts;

    /* Generic informative messages placeholder */
    GtkWidget *info_hbox;
    GtkWidget *info_icon;
    GtkWidget *info_string;
    gchar *subscriber_info_text;

    /* Organizer */
    GtkWidget *org_label;
    GtkWidget *org_combo;

    /* To field */
    GtkWidget *to_button;
    GtkWidget *to_hbox;
    GtkWidget *to_entry;

    /* Summary */
    GtkWidget *summary_label;
    GtkWidget *summary_entry;

    /* Start date */
    GtkWidget *start_label;
    GtkWidget *start_date;

    GtkWidget *categories_btn;
    GtkWidget *categories;

    GtkWidget *source_selector;

    GList *address_strings;

    ENameSelector *name_selector;
};

static void set_subscriber_info_string (MemoPage *mpage, const gchar *backend_address);
static const gchar * get_recipients (ECalComponent *comp);
static void sensitize_widgets (MemoPage *mpage);
static gboolean memo_page_fill_component (CompEditorPage *page, ECalComponent *comp);
static void memo_page_select_organizer (MemoPage *mpage, const gchar *backend_address);

G_DEFINE_TYPE (MemoPage, memo_page, TYPE_COMP_EDITOR_PAGE)

/* Fills the widgets with default values */
static void
clear_widgets (MemoPage *mpage)
{
    GtkTextBuffer *buffer;
    GtkTextView *view;
    CompEditor *editor;

    /* Summary */
    e_dialog_editable_set (mpage->priv->summary_entry, NULL);

    /* Description */
    view = GTK_TEXT_VIEW (mpage->priv->memo_content);
    buffer = gtk_text_view_get_buffer (view);
    gtk_text_buffer_set_text (buffer, "", 0);
    e_buffer_tagger_update_tags (view);

    /* Classification */
    editor = comp_editor_page_get_editor (COMP_EDITOR_PAGE (mpage));
    comp_editor_set_classification (editor, E_CAL_COMPONENT_CLASS_PRIVATE);

    /* Categories */
    e_dialog_editable_set (mpage->priv->categories, NULL);
}

static void
memo_page_dispose (GObject *object)
{
    MemoPagePrivate *priv;

    priv = MEMO_PAGE_GET_PRIVATE (object);

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

    /* Chain up to parent's dispose() method. */
    G_OBJECT_CLASS (memo_page_parent_class)->dispose (object);
}

static void
memo_page_finalize (GObject *object)
{
    MemoPagePrivate *priv;

    priv = MEMO_PAGE_GET_PRIVATE (object);

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

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

    g_free (priv->subscriber_info_text);

    /* Chain up to parent's finalize() method. */
    G_OBJECT_CLASS (memo_page_parent_class)->finalize (object);
}

static GtkWidget *
memo_page_get_widget (CompEditorPage *page)
{
    MemoPagePrivate *priv = MEMO_PAGE_GET_PRIVATE (page);

    return priv->main;
}

static void
memo_page_focus_main_widget (CompEditorPage *page)
{
    MemoPagePrivate *priv = MEMO_PAGE_GET_PRIVATE (page);

    gtk_widget_grab_focus (priv->summary_entry);
}

static gboolean
memo_page_fill_widgets (CompEditorPage *page,
                        ECalComponent *comp)
{
    MemoPage *mpage;
    MemoPagePrivate *priv;
    CompEditor *editor;
    CompEditorFlags flags;
    ECal *client;
    ECalComponentClassification cl;
    ECalComponentText text;
    ECalComponentDateTime d;
    GSList *l;
    const gchar *categories;
    gchar *backend_addr = NULL;

    mpage = MEMO_PAGE (page);
    priv = mpage->priv;

    editor = comp_editor_page_get_editor (page);
    client = comp_editor_get_client (editor);
    flags = comp_editor_get_flags (editor);

    /* Clean the screen */
    clear_widgets (mpage);

        /* Summary */
    e_cal_component_get_summary (comp, &text);
    e_dialog_editable_set (priv->summary_entry, text.value);

    e_cal_component_get_description_list (comp, &l);
    if (l && l->data) {
        ECalComponentText *dtext;

        dtext = l->data;
        gtk_text_buffer_set_text (gtk_text_view_get_buffer (GTK_TEXT_VIEW (priv->memo_content)),
                      dtext->value ? dtext->value : "", -1);
    } else {
        gtk_text_buffer_set_text (gtk_text_view_get_buffer (GTK_TEXT_VIEW (priv->memo_content)),
                      "", 0);
    }
    e_cal_component_free_text_list (l);
    e_buffer_tagger_update_tags (GTK_TEXT_VIEW (priv->memo_content));

    /* Start Date. */
    e_cal_component_get_dtstart (comp, &d);
    if (d.value) {
        struct icaltimetype *start_tt = d.value;
        e_date_edit_set_date (E_DATE_EDIT (priv->start_date),
                      start_tt->year, start_tt->month,
                      start_tt->day);
    } else if (!(flags & COMP_EDITOR_NEW_ITEM))
        e_date_edit_set_time (E_DATE_EDIT (priv->start_date), -1);
    e_cal_component_free_datetime (&d);

    /* Classification. */
    e_cal_component_get_classification (comp, &cl);
    comp_editor_set_classification (editor, cl);

    /* Categories */
    e_cal_component_get_categories (comp, &categories);
    e_dialog_editable_set (priv->categories, categories);

    e_cal_get_cal_address (client, &backend_addr, NULL);
    set_subscriber_info_string (mpage, backend_addr);

    if (e_cal_component_has_organizer (comp)) {
        ECalComponentOrganizer organizer;

        e_cal_component_get_organizer (comp, &organizer);
        if (organizer.value != NULL) {
            const gchar *strip = itip_strip_mailto (organizer.value);
            gchar *string;

            if ( organizer.cn != NULL)
                string = g_strdup_printf ("%s <%s>", organizer.cn, strip);
            else
                string = g_strdup (strip);

            if (itip_organizer_is_user (comp, client) || itip_sentby_is_user (comp, client)) {
                gtk_entry_set_text (GTK_ENTRY (gtk_bin_get_child (GTK_BIN (priv->org_combo))), string);
            } else {
                gtk_list_store_clear (GTK_LIST_STORE (gtk_combo_box_get_model (GTK_COMBO_BOX (priv->org_combo))));
                gtk_combo_box_append_text (GTK_COMBO_BOX (priv->org_combo), string);
                gtk_combo_box_set_active (GTK_COMBO_BOX (priv->org_combo), 0);
                gtk_editable_set_editable (GTK_EDITABLE (gtk_bin_get_child (GTK_BIN (priv->org_combo))), FALSE);
            }
            g_free (string);
        }
    }

    if (backend_addr)
        g_free (backend_addr);

    /* Source */
    e_source_combo_box_set_active (
        E_SOURCE_COMBO_BOX (priv->source_selector),
        e_cal_get_source (client));

    if (priv->to_entry && (flags & COMP_EDITOR_IS_SHARED) && !(flags & COMP_EDITOR_NEW_ITEM))
        gtk_entry_set_text (GTK_ENTRY (priv->to_entry), get_recipients (comp));

    sensitize_widgets (mpage);

    return TRUE;
}

static void
memo_page_class_init (MemoPageClass *class)
{
    CompEditorPageClass *editor_page_class;
    GObjectClass *object_class;

    g_type_class_add_private (class, sizeof (MemoPagePrivate));

    object_class = G_OBJECT_CLASS (class);
    object_class->dispose = memo_page_dispose;
    object_class->finalize = memo_page_finalize;

    editor_page_class = COMP_EDITOR_PAGE_CLASS (class);
    editor_page_class->get_widget = memo_page_get_widget;
    editor_page_class->focus_main_widget = memo_page_focus_main_widget;
    editor_page_class->fill_widgets = memo_page_fill_widgets;
    editor_page_class->fill_component = memo_page_fill_component;
}

static void
memo_page_init (MemoPage *mpage)
{
    mpage->priv = MEMO_PAGE_GET_PRIVATE (mpage);
}

static void
sensitize_widgets (MemoPage *mpage)
{
    GtkActionGroup *action_group;
    gboolean read_only, sens = FALSE, sensitize;
    CompEditor *editor;
    CompEditorFlags flags;
    MemoPagePrivate *priv;
    ECal *client;

    priv = mpage->priv;

    editor = comp_editor_page_get_editor (COMP_EDITOR_PAGE (mpage));
    client = comp_editor_get_client (editor);
    flags = comp_editor_get_flags (editor);

    if (!e_cal_is_read_only (client, &read_only, NULL))
        read_only = TRUE;

    if (flags & COMP_EDITOR_IS_SHARED)
        sens = flags & COMP_EDITOR_USER_ORG;
    else
        sens = TRUE;

    sensitize = (!read_only && sens);

    if (read_only) {
        gchar *tmp = g_strconcat ("<b>", _("Memo cannot be edited, because the selected memo list is read only"), "</b>", NULL);
        memo_page_set_info_string (mpage, GTK_STOCK_DIALOG_INFO, tmp);
        g_free (tmp);
    } else if (!sens) {
        gchar *tmp = g_strconcat ("<b>", _("Memo cannot be fully edited, because you are not the organizer"), "</b>", NULL);
        memo_page_set_info_string (mpage, GTK_STOCK_DIALOG_INFO, tmp);
        g_free (tmp);
    } else {
        memo_page_set_info_string (mpage, priv->subscriber_info_text ? GTK_STOCK_DIALOG_INFO : NULL, priv->subscriber_info_text);
    }

    /* The list of organizers is set to be non-editable. Otherwise any
    * change in the displayed list causes an 'Account not found' error.
    */
    gtk_editable_set_editable (GTK_EDITABLE (gtk_bin_get_child (GTK_BIN (priv->org_combo))), FALSE);

    gtk_text_view_set_editable (GTK_TEXT_VIEW (priv->memo_content), sensitize);
    gtk_widget_set_sensitive (priv->start_date, sensitize);
    gtk_widget_set_sensitive (priv->categories_btn, !read_only);
    gtk_editable_set_editable (GTK_EDITABLE (priv->categories), !read_only);
    gtk_editable_set_editable (GTK_EDITABLE (priv->summary_entry), sensitize);

    if (flags & COMP_EDITOR_IS_SHARED) {
        if (priv->to_entry) {
            gtk_editable_set_editable (GTK_EDITABLE (priv->to_entry), !read_only);
            gtk_widget_grab_focus (priv->to_entry);
        }
    }

    action_group = comp_editor_get_action_group (editor, "editable");
    gtk_action_group_set_sensitive (action_group, !read_only);

    action_group = comp_editor_get_action_group (editor, "individual");
    gtk_action_group_set_sensitive (action_group, sensitize);
}

/* returns empty string rather than NULL because of simplicity of usage */
static const gchar *
get_recipients (ECalComponent *comp)
{
    icalcomponent *icalcomp;
    icalproperty *icalprop;

    g_return_val_if_fail (comp != NULL, "");

    icalcomp = e_cal_component_get_icalcomponent (comp);

    /* first look if we have there such property */
    for (icalprop = icalcomponent_get_first_property (icalcomp, ICAL_X_PROPERTY);
         icalprop;
         icalprop = icalcomponent_get_next_property (icalcomp, ICAL_X_PROPERTY)) {
        const gchar *xname = icalproperty_get_x_name (icalprop);

        if (xname && strcmp (xname, "X-EVOLUTION-RECIPIENTS") == 0)
            break;
    }

    if (icalprop)
        return icalproperty_get_x (icalprop);

    return "";
}

static gboolean
fill_comp_with_recipients (ENameSelector *name_selector, ECalComponent *comp)
{
    EDestinationStore *destination_store;
    GString *str = NULL;
    GList *l, *destinations;
    ENameSelectorModel *name_selector_model = e_name_selector_peek_model (name_selector);
    icalcomponent *icalcomp;
    icalproperty *icalprop;

    e_name_selector_model_peek_section (name_selector_model, "To",
                        NULL, &destination_store);

    destinations = e_destination_store_list_destinations (destination_store);
    for (l = destinations; l; l = g_list_next (l)) {
        EDestination *destination = l->data, *des = NULL;
        const GList *list_dests = NULL, *l;
        GList card_dest;

        if (e_destination_is_evolution_list (destination)) {
            list_dests = e_destination_list_get_dests (destination);
        } else {
            EContact *contact = e_destination_get_contact (destination);
            /* check if the contact is contact list which is not expanded yet */
            /* we expand it by getting the list again from the server forming the query */
            if (contact && e_contact_get (contact , E_CONTACT_IS_LIST)) {
                EBook *book = NULL;
                ENameSelectorDialog *dialog;
                EContactStore *c_store;
                GList *books, *l;
                gchar *uri = e_contact_get (contact, E_CONTACT_BOOK_URI);

                dialog = e_name_selector_peek_dialog (name_selector);
                c_store = e_name_selector_dialog_peek_model (dialog)->contact_store;
                books = e_contact_store_get_books (c_store);

                for (l = books; l; l = l->next) {
                    EBook *b = l->data;
                    if (g_str_equal (uri, e_book_get_uri (b))) {
                        book = b;
                        break;
                    }
                }

                if (book) {
                    GList *contacts = NULL;
                    EContact *n_con = NULL;
                    gchar *qu;
                    EBookQuery *query;

                    qu = g_strdup_printf ("(is \"full_name\" \"%s\")",
                            (gchar *) e_contact_get (contact, E_CONTACT_FULL_NAME));
                    query = e_book_query_from_string (qu);

                    if (!e_book_get_contacts (book, query, &contacts, NULL)) {
                        g_warning ("Could not get contact from the book \n");
                    } else {
                        des = e_destination_new ();
                        n_con = contacts->data;

                        e_destination_set_contact (des, n_con, 0);
                        list_dests = e_destination_list_get_dests (des);

                        g_list_foreach (contacts, (GFunc) g_object_unref, NULL);
                        g_list_free (contacts);
                    }

                    e_book_query_unref (query);
                    g_free (qu);
                }
                g_list_free (books);
            } else {
                card_dest.next = NULL;
                card_dest.prev = NULL;
                card_dest.data = destination;
                list_dests = &card_dest;
            }
        }

        for (l = list_dests; l; l = l->next) {
            EDestination *dest = l->data;
            const gchar *attendee = NULL;

            /* If we couldn't get the attendee prior,
             * get the email address as the default. */
            if (attendee == NULL || *attendee == '\0')
                attendee = e_destination_get_email (dest);

            if (attendee == NULL || *attendee == '\0')
                continue;

            if (!str) {
                str = g_string_new (NULL);
                g_string_prepend (str, attendee);
                continue;
            }
            g_string_prepend_c (str, ';');
            g_string_prepend (str, attendee);
        }
    }

    g_list_free (destinations);

    if (str && *str->str) {
        icalcomp = e_cal_component_get_icalcomponent (comp);
        icalprop = icalproperty_new_x (str->str);
        icalproperty_set_x_name (icalprop, "X-EVOLUTION-RECIPIENTS");
        icalcomponent_add_property (icalcomp, icalprop);

        g_string_free (str, FALSE);
        return TRUE;
    } else
        return FALSE;
}

static EAccount *
get_current_account (MemoPage *page)
{
    MemoPagePrivate *priv = page->priv;
    EIterator *it;
    const gchar *str;

    str = gtk_entry_get_text (GTK_ENTRY (gtk_bin_get_child (GTK_BIN (priv->org_combo))));
    if (!str)
        return NULL;

    for (it = e_list_get_iterator((EList *)priv->accounts); e_iterator_is_valid(it); e_iterator_next(it)) {
        EAccount *a = (EAccount *)e_iterator_get(it);
        gchar *full = g_strdup_printf("%s <%s>", a->id->name, a->id->address);

        if (!g_ascii_strcasecmp (full, str)) {
            g_free (full);
            g_object_unref (it);

            return a;
        }

        g_free (full);
    }
    g_object_unref (it);

    return NULL;
}

/* fill_component handler for the memo page */
static gboolean
memo_page_fill_component (CompEditorPage *page,
                          ECalComponent *comp)
{
    MemoPage *mpage;
    MemoPagePrivate *priv;
    CompEditor *editor;
    CompEditorFlags flags;
    ECal *client;
    ECalComponentClassification classification;
    ECalComponentDateTime start_date;
    struct icaltimetype start_tt;
    gchar *cat, *str;
    gint i;
    GtkTextBuffer *text_buffer;
    GtkTextIter text_iter_start, text_iter_end;

    mpage = MEMO_PAGE (page);
    priv = mpage->priv;

    editor = comp_editor_page_get_editor (page);
    client = comp_editor_get_client (editor);
    flags = comp_editor_get_flags (editor);

    text_buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (priv->memo_content));

    /* Summary */
    str = e_dialog_editable_get (priv->summary_entry);
    if (!str || strlen (str) == 0)
        e_cal_component_set_summary (comp, NULL);
    else {
        ECalComponentText text;

        text.value = str;
        text.altrep = NULL;

        e_cal_component_set_summary (comp, &text);
    }

    if (str) {
        g_free (str);
        str = NULL;
    }

    /* Memo Content */

    gtk_text_buffer_get_start_iter (text_buffer, &text_iter_start);
    gtk_text_buffer_get_end_iter   (text_buffer, &text_iter_end);
    str = gtk_text_buffer_get_text (text_buffer, &text_iter_start, &text_iter_end, FALSE);

    if (!str || strlen (str) == 0) {
        e_cal_component_set_description_list (comp, NULL);
    }
    else {
        gint idxToUse = 1;
        GSList l;
        ECalComponentText text, sumText;
        gchar *txt, *p;
        gunichar uc;

        for (i = 0, p = str, uc = g_utf8_get_char_validated (p, -1);
            i < 50 && p && uc < (gunichar)-2;
            i++, p = g_utf8_next_char (p), uc = g_utf8_get_char_validated (p, -1)) {
            idxToUse = p - str;
            if (uc == '\n' || !uc) {
                p = NULL;
                break;
            }
        }

        if (p)
            idxToUse = p - str;

        if (i == 50 && uc && uc < (gunichar)-2)
            sumText.value = txt = g_strdup_printf ("%.*s...", idxToUse, str);
        else
            sumText.value = txt = g_strndup(str, idxToUse);

        sumText.altrep = NULL;

        text.value = str;
        text.altrep = NULL;
        l.data = &text;
        l.next = NULL;

        e_cal_component_set_description_list (comp, &l);

        g_free(txt);
    }

    if (str)
        g_free (str);

    /* Dates */
    start_tt = icaltime_null_time ();
    start_tt.is_date = 1;
    start_date.value = &start_tt;
    start_date.tzid = NULL;

    if (!e_date_edit_date_is_valid (E_DATE_EDIT (priv->start_date))) {
        comp_editor_page_display_validation_error (page, _("Start date is wrong"), priv->start_date);
        return FALSE;
    }
    if (e_date_edit_get_date (E_DATE_EDIT (priv->start_date),
                           &start_tt.year,
                           &start_tt.month,
                           &start_tt.day))
        e_cal_component_set_dtstart (comp, &start_date);
    else
        e_cal_component_set_dtstart (comp, NULL);

    /* Classification. */
    classification = comp_editor_get_classification (editor);
    e_cal_component_set_classification (comp, classification);

    /* Categories */
    cat = e_dialog_editable_get (priv->categories);
    str = comp_editor_strip_categories (cat);
    if (cat)
        g_free (cat);

    e_cal_component_set_categories (comp, str);

    if (str)
        g_free (str);

    /* change recipients only when creating new item, after that no such action is available */
    if ((flags & COMP_EDITOR_IS_SHARED) && (flags & COMP_EDITOR_NEW_ITEM) && fill_comp_with_recipients (priv->name_selector, comp)) {
        ECalComponentOrganizer organizer = {NULL, NULL, NULL, NULL};

        EAccount *a;
        gchar *backend_addr = NULL, *org_addr = NULL, *sentby = NULL;

        e_cal_get_cal_address (client, &backend_addr, NULL);

        /* Find the identity for the organizer or sentby field */
        a = get_current_account (mpage);

        /* Sanity Check */
        if (a == NULL) {
            e_notice (priv->main, GTK_MESSAGE_ERROR,
                    _("The organizer selected no longer has an account."));
            return FALSE;
        }

        if (a->id->address == NULL || strlen (a->id->address) == 0) {
            e_notice (priv->main, GTK_MESSAGE_ERROR,
                    _("An organizer is required."));
            return FALSE;
        }

        if (!(backend_addr && *backend_addr) || !g_ascii_strcasecmp (backend_addr, a->id->address)) {
            org_addr = g_strdup_printf ("MAILTO:%s", a->id->address);
            organizer.value = org_addr;
            organizer.cn = a->id->name;
        } else {
            org_addr = g_strdup_printf ("MAILTO:%s", backend_addr);
            sentby = g_strdup_printf ("MAILTO:%s", a->id->address);
            organizer.value = org_addr;
            organizer.sentby = sentby;
        }

        e_cal_component_set_organizer (comp, &organizer);

        if (flags & COMP_EDITOR_NEW_ITEM)
            comp_editor_set_needs_send (editor, TRUE);

        g_free (backend_addr);
        g_free (org_addr);
        g_free (sentby);
    }

    return TRUE;
}

void
memo_page_set_show_categories (MemoPage *page, gboolean state)
{
    if (state) {
        gtk_widget_show (page->priv->categories_btn);
        gtk_widget_show (page->priv->categories);
    } else {
        gtk_widget_hide (page->priv->categories_btn);
        gtk_widget_hide (page->priv->categories);
    }
}

/*If the msg has some value set, the icon should always be set */
void
memo_page_set_info_string (MemoPage *mpage, const gchar *icon, const gchar *msg)
{
    MemoPagePrivate *priv;

    priv = mpage->priv;

    gtk_image_set_from_stock (GTK_IMAGE (priv->info_icon), icon, GTK_ICON_SIZE_BUTTON);
    gtk_label_set_markup (GTK_LABEL(priv->info_string), msg);

    if (msg && icon)
        gtk_widget_show (priv->info_hbox);
    else
        gtk_widget_hide (priv->info_hbox);
}

/* Gets the widgets from the XML file and returns if they are all available. */
static gboolean
get_widgets (MemoPage *mpage)
{
    CompEditorPage *page = COMP_EDITOR_PAGE (mpage);
    GtkEntryCompletion *completion;
    MemoPagePrivate *priv;
    GSList *accel_groups;
    GtkWidget *toplevel;

    priv = mpage->priv;

#define GW(name) e_builder_get_widget (priv->builder, name)

    priv->main = GW ("memo-page");
    if (!priv->main) {
        g_warning("couldn't find memo-page!");
        return FALSE;
    }

    /* Get the GtkAccelGroup from the toplevel window, so we can install
       it when the notebook page is mapped. */
    toplevel = gtk_widget_get_toplevel (priv->main);
    accel_groups = gtk_accel_groups_from_object (G_OBJECT (toplevel));
    if (accel_groups)
        page->accel_group = g_object_ref (accel_groups->data);

    g_object_ref (priv->main);
    gtk_container_remove (GTK_CONTAINER (priv->main->parent), priv->main);

    priv->info_hbox = GW ("generic-info");
    priv->info_icon = GW ("generic-info-image");
    priv->info_string = GW ("generic-info-msgs");

    priv->org_label = GW ("org-label");
    priv->org_combo = GW ("org-combo");
    gtk_list_store_clear (GTK_LIST_STORE (gtk_combo_box_get_model (GTK_COMBO_BOX (priv->org_combo))));
    gtk_combo_box_entry_set_text_column (GTK_COMBO_BOX_ENTRY (priv->org_combo), 0);

    priv->to_button = GW ("to-button");
    priv->to_hbox = GW ("to-hbox");

    priv->summary_label = GW ("sum-label");
    priv->summary_entry = GW ("sum-entry");

    priv->start_label = GW ("start-label");
    priv->start_date = GW ("start-date");

    priv->memo_content = GW ("memo_content");

    priv->categories_btn = GW ("categories-button");
    priv->categories = GW ("categories");

    priv->source_selector = GW ("source");
#undef GW

    e_util_set_source_combo_box_list (priv->source_selector, "/apps/evolution/memos/sources");

    completion = e_category_completion_new ();
    gtk_entry_set_completion (GTK_ENTRY (priv->categories), completion);
    g_object_unref (completion);

    return (priv->memo_content
        && priv->categories_btn
        && priv->categories
        && priv->start_date);
}

/* Callback used when the categories button is clicked; we must bring up the
 * category list dialog.
 */
static void
categories_clicked_cb (GtkWidget *button,
                       MemoPage *mpage)
{
    GtkEntry *entry;

    entry = GTK_ENTRY (mpage->priv->categories);
    e_categories_config_open_dialog_for_entry (entry);
}

static void
source_changed_cb (ESourceComboBox *source_combo_box,
                   MemoPage *mpage)
{
    MemoPagePrivate *priv = mpage->priv;
    CompEditor *editor;
    CompEditorFlags flags;
    ESource *source;
    ECal *client;

    if (comp_editor_page_get_updating (COMP_EDITOR_PAGE (mpage)))
        return;

    editor = comp_editor_page_get_editor (COMP_EDITOR_PAGE (mpage));
    flags = comp_editor_get_flags (editor);

    source = e_source_combo_box_get_active (source_combo_box);
    client = e_auth_new_cal_from_source (source, E_CAL_SOURCE_TYPE_JOURNAL);

    if (!client || !e_cal_open (client, FALSE, NULL)) {
        GtkWidget *dialog;
        ECal *old_client;

        old_client = comp_editor_get_client (editor);

        if (client)
            g_object_unref (client);

        e_source_combo_box_set_active (
            E_SOURCE_COMBO_BOX (priv->source_selector),
            e_cal_get_source (old_client));

        dialog = gtk_message_dialog_new (NULL, GTK_DIALOG_MODAL,
                         GTK_MESSAGE_WARNING, GTK_BUTTONS_OK,
                         _("Unable to open memos in '%s'."),
                         e_source_peek_name (source));
        gtk_dialog_run (GTK_DIALOG (dialog));
        gtk_widget_destroy (dialog);
    } else {
        comp_editor_set_client (editor, client);

        if (client) {
            gchar *backend_addr = NULL;

            e_cal_get_cal_address(client, &backend_addr, NULL);

            if (flags & COMP_EDITOR_IS_SHARED)
                memo_page_select_organizer (mpage, backend_addr);

            set_subscriber_info_string (mpage, backend_addr);
            g_free (backend_addr);
        }

        sensitize_widgets (mpage);
    }
}

static void
set_subscriber_info_string (MemoPage *mpage,
                            const gchar *backend_address)
{
    CompEditor *editor;
    ECal *client;
    ESource *source;

    editor = comp_editor_page_get_editor (COMP_EDITOR_PAGE (mpage));
    client = comp_editor_get_client (editor);
    source = e_cal_get_source (client);

    if (e_source_get_property (source, "subscriber")) {
        g_free (mpage->priv->subscriber_info_text);
        /* Translators: This string is used when we are creating a Memo
           on behalf of some other user */
        mpage->priv->subscriber_info_text = g_markup_printf_escaped (_("You are acting on behalf of %s"), backend_address);
        memo_page_set_info_string (mpage, GTK_STOCK_DIALOG_INFO, mpage->priv->subscriber_info_text);
    } else {
        g_free (mpage->priv->subscriber_info_text);
        mpage->priv->subscriber_info_text = NULL;

        memo_page_set_info_string (mpage, NULL, NULL);
    }
}

static void
summary_changed_cb (GtkEditable *editable,
                    CompEditorPage *page)
{
    CompEditor *editor;
    gchar *summary;

    if (comp_editor_page_get_updating (page))
        return;

    editor = comp_editor_page_get_editor (page);
    summary = e_dialog_editable_get (GTK_WIDGET (editable));
    comp_editor_set_summary (editor, summary);
    g_free (summary);
}

static void
to_button_clicked_cb (GtkButton *button,
                      MemoPage *mpage)
{
    ENameSelectorDialog *name_selector_dialog;

    name_selector_dialog = e_name_selector_peek_dialog (
        mpage->priv->name_selector);
    gtk_widget_show (GTK_WIDGET (name_selector_dialog));
}

/* Hooks the widget signals */
static gboolean
init_widgets (MemoPage *mpage)
{
    CompEditor *editor;
    MemoPagePrivate *priv = mpage->priv;
    GtkTextBuffer *buffer;
    GtkTextView *view;
    GtkAction *action;
    gboolean active;

    editor = comp_editor_page_get_editor (COMP_EDITOR_PAGE (mpage));

    /* Generic informative messages */
    gtk_widget_hide (priv->info_hbox);

    /* Summary */
    g_signal_connect (
        priv->summary_entry, "changed",
        G_CALLBACK (summary_changed_cb), mpage);

    /* Memo Content */
    view = GTK_TEXT_VIEW (priv->memo_content);
    buffer = gtk_text_view_get_buffer (view);
    gtk_text_view_set_wrap_mode (view, GTK_WRAP_WORD);
    e_buffer_tagger_connect (view);

    /* Categories button */
    g_signal_connect(
        priv->categories_btn, "clicked",
        G_CALLBACK (categories_clicked_cb), mpage);

    /* Source selector */
    g_signal_connect (
        priv->source_selector, "changed",
        G_CALLBACK (source_changed_cb), mpage);

    /* Connect the default signal handler to use to make sure the "changed"
       field gets set whenever a field is changed. */

    /* Belongs to priv->memo_content */
    g_signal_connect_swapped (
        buffer, "changed",
        G_CALLBACK (comp_editor_page_changed), mpage);

    g_signal_connect_swapped (
        priv->categories, "changed",
        G_CALLBACK (comp_editor_page_changed), mpage);

    g_signal_connect_swapped (
        priv->summary_entry, "changed",
        G_CALLBACK (comp_editor_page_changed), mpage);

    g_signal_connect_swapped (
        priv->source_selector, "changed",
        G_CALLBACK (comp_editor_page_changed), mpage);

    g_signal_connect_swapped (
        priv->start_date, "changed",
        G_CALLBACK (comp_editor_page_changed), mpage);

    if (priv->name_selector) {
        ENameSelectorDialog *name_selector_dialog;

        name_selector_dialog = e_name_selector_peek_dialog (priv->name_selector);

        g_signal_connect (
            name_selector_dialog, "response",
            G_CALLBACK (gtk_widget_hide), NULL);
        g_signal_connect (
            priv->to_button, "clicked",
            G_CALLBACK (to_button_clicked_cb), mpage);
        g_signal_connect_swapped (
            priv->to_entry, "changed",
            G_CALLBACK (comp_editor_page_changed), mpage);
    }

    action = comp_editor_get_action (editor, "view-categories");
    active = gtk_toggle_action_get_active (GTK_TOGGLE_ACTION (action));
    memo_page_set_show_categories (mpage, active);

    return TRUE;
}

static GtkWidget *
get_to_entry (ENameSelector *name_selector)
{
    ENameSelectorModel *name_selector_model;
    ENameSelectorEntry *name_selector_entry;

    name_selector_model = e_name_selector_peek_model (name_selector);
    e_name_selector_model_add_section (name_selector_model, "To", _("To"), NULL);
    name_selector_entry = (ENameSelectorEntry *)e_name_selector_peek_section_list (name_selector, "To");

    return GTK_WIDGET (name_selector_entry);
}

static void
memo_page_select_organizer (MemoPage *mpage, const gchar *backend_address)
{
    MemoPagePrivate *priv;
    CompEditor *editor;
    CompEditorFlags flags;
    GList *l;
    ECal *client;
    EAccount *def_account;
    gchar *def_address = NULL;
    const gchar *default_address;
    gboolean subscribed_cal = FALSE;
    ESource *source = NULL;
    const gchar *user_addr = NULL;

    def_account = itip_addresses_get_default();
    if (def_account && def_account->enabled)
        def_address = g_strdup_printf("%s <%s>", def_account->id->name, def_account->id->address);

    priv = mpage->priv;
    editor = comp_editor_page_get_editor (COMP_EDITOR_PAGE (mpage));
    client = comp_editor_get_client (editor);
    flags = comp_editor_get_flags (editor);

    if (client)
        source = e_cal_get_source (client);
    if (source)
        user_addr = e_source_get_property (source, "subscriber");

    if (user_addr)
        subscribed_cal = TRUE;
    else
        user_addr = (backend_address && *backend_address) ? backend_address : NULL;

    default_address = NULL;
    if (user_addr)
        for (l = priv->address_strings; l != NULL; l = l->next)
            if (g_strrstr ((gchar *) l->data, user_addr) != NULL) {
                default_address = (const gchar *) l->data;
                break;
            }

    if (!default_address && def_account)
        default_address = def_address;

    if (default_address) {
        if (flags & COMP_EDITOR_NEW_ITEM) {
            gtk_entry_set_text (GTK_ENTRY (gtk_bin_get_child (GTK_BIN (priv->org_combo))), default_address);
            gtk_widget_set_sensitive (priv->org_combo, !subscribed_cal);
        }
    } else
        g_warning ("No potential organizers!");

    g_free (def_address);
}

/**
 * memo_page_construct:
 * @mpage: An memo page.
 *
 * Constructs an memo page by loading its Glade data.
 *
 * Return value: The same object as @mpage, or NULL if the widgets could not be
 * created.
 **/
MemoPage *
memo_page_construct (MemoPage *mpage)
{
    MemoPagePrivate *priv = mpage->priv;
    CompEditor *editor;
    CompEditorFlags flags;
    EIterator *it;
    EAccount *a;

    editor = comp_editor_page_get_editor (COMP_EDITOR_PAGE (mpage));
    flags = comp_editor_get_flags (editor);

    priv->builder = gtk_builder_new ();
    e_load_ui_builder_definition (priv->builder, "memo-page.ui");

    if (!get_widgets (mpage)) {
        g_message ("memo_page_construct(): "
               "Could not find all widgets in the XML file!");
        return NULL;
    }

    if (flags & COMP_EDITOR_IS_SHARED) {
        priv->accounts = itip_addresses_get ();
        for (it = e_list_get_iterator((EList *)priv->accounts);
                e_iterator_is_valid(it);
                e_iterator_next(it)) {
            gchar *full = NULL;

            a = (EAccount *)e_iterator_get(it);

            /* skip disabled accounts */
            if (!a->enabled)
                continue;

            full = g_strdup_printf("%s <%s>", a->id->name, a->id->address);

            priv->address_strings = g_list_append(priv->address_strings, full);
        }

        g_object_unref(it);

        if (priv->address_strings) {
            GList *l;

            for (l = priv->address_strings; l; l = l->next)
                gtk_combo_box_append_text (GTK_COMBO_BOX (priv->org_combo), l->data);

            gtk_combo_box_set_active (GTK_COMBO_BOX (priv->org_combo), 0);
        } else
            g_warning ("No potential organizers!");

        gtk_widget_show (priv->org_label);
        gtk_widget_show (priv->org_combo);

        priv->name_selector = e_name_selector_new ();
        priv->to_entry = get_to_entry (priv->name_selector);
        gtk_container_add ((GtkContainer *)priv->to_hbox, priv->to_entry);
        gtk_widget_show (priv->to_hbox);
        gtk_widget_show (priv->to_entry);
        gtk_widget_show (priv->to_button);

        if (!(flags & COMP_EDITOR_NEW_ITEM)) {
            gtk_widget_set_sensitive (priv->to_button, FALSE);
            gtk_widget_set_sensitive (priv->to_entry, FALSE);
        }
    }

    if (!init_widgets (mpage)) {
        g_message ("memo_page_construct(): "
               "Could not initialize the widgets!");
        return NULL;
    }

    return mpage;
}

/**
 * memo_page_new:
 *
 * Creates a new memo page.
 *
 * Return value: A newly-created task page, or NULL if the page could
 * not be created.
 **/
MemoPage *
memo_page_new (CompEditor *editor)
{
    MemoPage *mpage;

    g_return_val_if_fail (IS_COMP_EDITOR (editor), NULL);

    mpage = g_object_new (TYPE_MEMO_PAGE, "editor", editor, NULL);

    if (!memo_page_construct (mpage)) {
        g_object_unref (mpage);
        g_return_val_if_reached (NULL);
    }

    return mpage;
}