path: root/mail/em-subscribe-editor.c

/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) version 3.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the program; if not, see <http://www.gnu.org/licenses/>  
 *
 *
 * Authors:
 *      Michael Zucchi <notzed@ximian.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

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

#include <string.h>

#include <pthread.h>

#include "mail-tools.h"
#include "mail-ops.h"
#include "mail-mt.h"
/*#include "mail-folder-cache.h"*/
#include "camel/camel-exception.h"
#include "camel/camel-store.h"
#include "camel/camel-session.h"
#include "libedataserver/e-account-list.h"
#include "libedataserver/e-msgport.h"
#include "e-util/e-util-private.h"

#include "em-subscribe-editor.h"

#include "mail-config.h"

#include <glade/glade.h>
#include <glib/gi18n.h>

#define d(x)

typedef struct _EMSubscribeEditor EMSubscribeEditor;
struct _EMSubscribeEditor {
    EDList stores;

    int busy;
    guint busy_id;

    struct _EMSubscribe *current; /* the current one, if any */

    GtkDialog *dialog;
    GtkWidget *vbox;    /* where new stores are added */
    GtkWidget *combobox;
    GtkWidget *none_selected; /* 'please select a xxx' message */
    GtkWidget *progress;
};

typedef struct _EMSubscribe EMSubscribe;
struct _EMSubscribe {
    struct _EMSubscribe *next;
    struct _EMSubscribe *prev;

    int ref_count;
    int cancel;
    int seq;        /* upped every time we refresh */

    struct _EMSubscribeEditor *editor; /* parent object*/

    char *store_uri;
    int store_id;       /* looking up a store */

    CamelStore *store;
    GHashTable *folders;

    GtkWidget *widget;  /* widget to show for this store */
    GtkTreeView *tree;  /* tree, if we have it */

    /* list of all returns from get_folder_info, accessed by other structures */
    GSList *info_list;

    /* pending LISTs, EMSubscribeNode's */
    int pending_id;
    EDList pending;

    /* queue of pending UN/SUBSCRIBEs, EMsg's */
    int subscribe_id;
    EDList subscribe;

    /* working variables at runtime */
    int selected_count;
    int selected_subscribed_count;
    guint subscribed_state:1; /* for setting the selection*/
};

typedef struct _EMSubscribeNode EMSubscribeNode;
struct _EMSubscribeNode {
    struct _EMSubscribeNode *next;
    struct _EMSubscribeNode *prev;

    CamelFolderInfo *info;
    GtkTreePath *path;
};

typedef struct _MailMsgListNode MailMsgListNode;
struct _MailMsgListNode {
    EDListNode node;    
    MailMsg *msg;
};

static void sub_editor_busy(EMSubscribeEditor *se, int dir);
static int sub_queue_fill_level(EMSubscribe *sub, EMSubscribeNode *node);
static void sub_selection_changed(GtkTreeSelection *selection, EMSubscribe *sub);

static void
sub_node_free(EMSubscribeNode *node)
{
    d(printf("sub node free '%s'\n", node->info?node->info->full_name:"<unknown>"));
    if (node->path)
        gtk_tree_path_free(node->path);
    g_free(node);
}

static void
sub_ref(EMSubscribe *sub)
{
    sub->ref_count++;
}

static void
sub_unref(EMSubscribe *sub)
{
    GSList *l;

    sub->ref_count--;
    if (sub->ref_count == 0) {
        d(printf("subscribe object finalised\n"));
        /* we dont have to delete the "subscribe" task list, as it must be empty,
           otherwise we wouldn't be unreffed (intentional circular reference) */
        if (sub->folders)
            g_hash_table_destroy(sub->folders);
        l = sub->info_list;
        while (l) {
            GSList *n = l->next;

            camel_store_free_folder_info(sub->store, (CamelFolderInfo *)l->data);
            g_slist_free_1(l);
            l = n;
        }
        if (sub->store)
            camel_object_unref(sub->store);
        g_free(sub->store_uri);
        g_free(sub);
    }
}

/* ** Subscribe folder operation **************************************** */

struct _zsubscribe_msg {
    MailMsg base;

    EMSubscribe *sub;
    EMSubscribeNode *node;
    int subscribe;
    char *path;
};

static void
sub_folder_exec (struct _zsubscribe_msg *m)
{
    if (m->subscribe)
        camel_store_subscribe_folder (m->sub->store, m->node->info->full_name, &m->base.ex);
    else
        camel_store_unsubscribe_folder (m->sub->store, m->node->info->full_name, &m->base.ex);
}

static void
sub_folder_done (struct _zsubscribe_msg *m)
{
    struct _zsubscribe_msg *next;
    GtkTreeIter iter;
    GtkTreeModel *model;
    EMSubscribeNode *node;
    gboolean subscribed, issub;
    MailMsgListNode *msgListNode;

    m->sub->subscribe_id = -1;
    if (m->sub->cancel)
        return;

    if (!camel_exception_is_set(&m->base.ex)) {
        if (m->subscribe)
            m->node->info->flags |= CAMEL_FOLDER_SUBSCRIBED;
        else
            m->node->info->flags &= ~CAMEL_FOLDER_SUBSCRIBED;
    }

    /* make sure the tree view matches the correct state */
    model = gtk_tree_view_get_model(m->sub->tree);
    if (gtk_tree_model_get_iter_from_string(model, &iter, m->path)) {
        issub = (m->node->info->flags & CAMEL_FOLDER_SUBSCRIBED) != 0;
        gtk_tree_model_get(model, &iter, 0, &subscribed, 2, &node, -1);
        if (node == m->node)
            gtk_tree_store_set((GtkTreeStore *)model, &iter, 0, issub, -1);
        else
            d(printf("node mismatch, or subscribe state changed failed\n"));
    }

    /* queue any further ones, or if out, update the ui */
    msgListNode = (MailMsgListNode *) e_dlist_remhead(&m->sub->subscribe);
    if (msgListNode) {
        next = (struct _zsubscribe_msg *) msgListNode->msg;
            /* Free the memory of the MailMsgListNode which won't be used anymore. */
            g_free(msgListNode);
        next->sub->subscribe_id = next->base.seq;
                mail_msg_unordered_push (next);
    } else {
        /* should it go off the model instead? */
        sub_selection_changed(gtk_tree_view_get_selection(m->sub->tree), m->sub);
    }
}

static void
sub_folder_free (struct _zsubscribe_msg *m)
{
    g_free(m->path);
    sub_unref(m->sub);
}

static MailMsgInfo sub_subscribe_folder_info = {
    sizeof (struct _zsubscribe_msg),
    (MailMsgDescFunc) NULL,
    (MailMsgExecFunc) sub_folder_exec,
    (MailMsgDoneFunc) sub_folder_done,
    (MailMsgFreeFunc) sub_folder_free
};

/* spath is tree path in string form */
static int
sub_subscribe_folder (EMSubscribe *sub, EMSubscribeNode *node, int state, const char *spath)
{
    struct _zsubscribe_msg *m;
    MailMsgListNode *msgListNode;
    int id;

    m = mail_msg_new (&sub_subscribe_folder_info);
    m->sub = sub;
    sub_ref(sub);
    m->node = node;
    m->subscribe = state;
    m->path = g_strdup(spath);

    id = m->base.seq;
    if (sub->subscribe_id == -1) {
        sub->subscribe_id = id;
        d(printf("running subscribe folder '%s'\n", spath));
        mail_msg_unordered_push (m);
    } else {
        msgListNode = g_malloc0(sizeof(MailMsgListNode)); 
        msgListNode->msg = (MailMsg *) m;
        d(printf("queueing subscribe folder '%s'\n", spath));
        e_dlist_addtail(&sub->subscribe, (EDListNode *)msgListNode);
    }

    return id;
}

/* ********************************************************************** */
static void
sub_fill_level(EMSubscribe *sub, CamelFolderInfo *info,  GtkTreeIter *parent, int pending)
{
    CamelFolderInfo *fi;
    GtkTreeStore *treestore;
    GtkTreeIter iter;
    EMSubscribeNode *node;

    treestore = (GtkTreeStore *)gtk_tree_view_get_model(sub->tree);

    /* first, fill a level up */
    fi = info;
    while (fi) {
        gboolean known = FALSE;

        if ((node = g_hash_table_lookup(sub->folders, fi->full_name)) == NULL) {
            gboolean state;

            gtk_tree_store_append(treestore, &iter, parent);
            node = g_malloc0(sizeof(*node));
            node->info = fi;
            state = (fi->flags & CAMEL_FOLDER_SUBSCRIBED) != 0;
            gtk_tree_store_set(treestore, &iter, 0, state, 1, fi->name, 2, node, -1);
            if ((fi->flags & CAMEL_FOLDER_NOINFERIORS) == 0)
                node->path = gtk_tree_model_get_path((GtkTreeModel *)treestore, &iter);
            g_hash_table_insert(sub->folders, fi->full_name, node);
        } else if (node->path) {
            gtk_tree_model_get_iter(gtk_tree_view_get_model(sub->tree), &iter, node->path);
            known = TRUE;
        }

        d(printf("flags & CAMEL_FOLDER_NOCHILDREN=%d, f & CAMEL_FOLDER_NOINFERIORS=%d\t fi->full_name=[%s], node->path=%p\n",
             fi->flags & CAMEL_FOLDER_NOCHILDREN, fi->flags & CAMEL_FOLDER_NOINFERIORS, fi->full_name,
             node->path));

        if ((fi->flags & CAMEL_FOLDER_NOINFERIORS) == 0
            && node->path) {
            /* save time, if we have any children alread, dont re-scan */
            if (fi->child) {
                d(printf("scanning child '%s'\n", fi->child->full_name));
                sub_fill_level(sub, fi->child, &iter, FALSE);
            } else if (!(fi->flags & CAMEL_FOLDER_NOCHILDREN)) {
                GtkTreeIter new_iter;
                d(printf("flags: CAMEL_FOLDER_NOCHILDREN is not set '%s', known:%d\n", fi->full_name, known?1:0));
                if (!known) {
                    gtk_tree_store_append(treestore, &new_iter, &iter);
                    gtk_tree_store_set(treestore, &new_iter, 0, 0, 1, "Loading...", 2, NULL, -1);
                }
            }
            else {
                if (pending)
                    e_dlist_addtail(&sub->pending, (EDListNode *)node);
            }
        } else {
            d(printf("%s:%s: fi->flags & CAMEL_FOLDER_NOINFERIORS=%d\t node->path=[%p]\n",
                 G_STRLOC, G_STRFUNC, fi->flags & CAMEL_FOLDER_NOINFERIORS,
                 node->path));
        }

        fi = fi->next;
    }
}

/* async query of folderinfo */

struct _emse_folderinfo_msg {
    MailMsg base;

    int seq;

    EMSubscribe *sub;
    EMSubscribeNode *node;
    CamelFolderInfo *info;
};

static void
sub_folderinfo_exec (struct _emse_folderinfo_msg *m)
{
    char *pub_full_name=NULL;

    if (m->seq == m->sub->seq) {
        camel_operation_register(m->base.cancel);
        m->info = camel_store_get_folder_info(m->sub->store, m->node?m->node->info->full_name:pub_full_name, CAMEL_STORE_FOLDER_INFO_NO_VIRTUAL, &m->base.ex);
        camel_operation_unregister(m->base.cancel);
    }
}

static void
sub_folderinfo_done (struct _emse_folderinfo_msg *m)
{
    EMSubscribeNode *node;

    m->sub->pending_id = -1;
    if (m->sub->cancel || m->seq != m->sub->seq)
        return;

    if (camel_exception_is_set (&m->base.ex)) {
        g_warning ("Error getting folder info from store: %s",
               camel_exception_get_description (&m->base.ex));
    }

    if (m->info) {
        if (m->node) {
            GtkTreeIter iter;

            gtk_tree_model_get_iter(gtk_tree_view_get_model(m->sub->tree), &iter, m->node->path);
            sub_fill_level(m->sub, m->info, &iter, FALSE);
        } else {
            sub_fill_level(m->sub, m->info, NULL, TRUE);
        }
    }

    /* check for more to do */
    node = (EMSubscribeNode *)e_dlist_remhead(&m->sub->pending);
    if (node)
        sub_queue_fill_level(m->sub, node);
}

static void
sub_folderinfo_free (struct _emse_folderinfo_msg *m)
{
    if (m->info)
        m->sub->info_list = g_slist_prepend(m->sub->info_list, m->info);

    if (!m->sub->cancel)
        sub_editor_busy(m->sub->editor, -1);

    /* Now we just load the children on demand, so set the
       expand state to true if m->node is not NULL
    */
    if (m->node)
        gtk_tree_view_expand_row(m->sub->tree, m->node->path, FALSE);

    sub_unref(m->sub);
}

static MailMsgInfo sub_folderinfo_info = {
    sizeof (struct _emse_folderinfo_msg),
    (MailMsgDescFunc) NULL,
    (MailMsgExecFunc) sub_folderinfo_exec,
    (MailMsgDoneFunc) sub_folderinfo_done,
    (MailMsgFreeFunc) sub_folderinfo_free
};

static int
sub_queue_fill_level(EMSubscribe *sub, EMSubscribeNode *node)
{
    struct _emse_folderinfo_msg *m;
    int id;

    d(printf("%s:%s: Starting get folderinfo of '%s'\n", G_STRLOC, G_STRFUNC,
         node?node->info->full_name:"<root>"));

    m = mail_msg_new (&sub_folderinfo_info);
    sub_ref(sub);
    m->sub = sub;
    m->node = node;
    m->seq = sub->seq;

    sub->pending_id = m->base.seq;

    sub_editor_busy(sub->editor, 1);

    id = m->base.seq;

    mail_msg_unordered_push (m);
    return id;
}

/* ********************************************************************** */

/* (un) subscribes the current selection */

static void
sub_subscribe_toggled(GtkCellRendererToggle *render, const char *spath, EMSubscribe *sub)
{
    GtkTreeIter iter;
    GtkTreeModel *model = gtk_tree_view_get_model(sub->tree);
    EMSubscribeNode *node;
    gboolean subscribed;

    d(printf("subscribe toggled?\n"));

    if (gtk_tree_model_get_iter_from_string(model, &iter, spath)) {
        gtk_tree_model_get(model, &iter, 0, &subscribed, 2, &node, -1);
        subscribed = !subscribed;
        d(printf("new state is %s\n", subscribed?"subscribed":"not subscribed"));
        gtk_tree_store_set((GtkTreeStore *)model, &iter, 0, subscribed, -1);
        sub_subscribe_folder(sub, node, subscribed, spath);
    }
}

static void sub_do_changed(GtkTreeModel *model, GtkTreePath *path, GtkTreeIter *iter, void *data)
{
    EMSubscribe *sub = data;
    EMSubscribeNode *node;
    gboolean subscribed;

    gtk_tree_model_get(model, iter, 0, &subscribed, 2, &node, -1);

    if (subscribed)
        sub->selected_subscribed_count++;
    sub->selected_count++;
}

static void
sub_selection_changed(GtkTreeSelection *selection, EMSubscribe *sub)
{
    int dosub = TRUE, dounsub = TRUE;

    sub->selected_count = 0;
    sub->selected_subscribed_count = 0;
    gtk_tree_selection_selected_foreach(selection, sub_do_changed, sub);

    if (sub->selected_count == 0) {
        dosub = FALSE;
        dounsub = FALSE;
    } else if (sub->selected_subscribed_count == sub->selected_count)
        dosub = FALSE;
    else if (sub->selected_subscribed_count == 0)
        dounsub = FALSE;

}

/* double-clicking causes a node item to be evaluated directly */
static void sub_row_activated(GtkTreeView *tree, GtkTreePath *path, GtkTreeViewColumn *col, EMSubscribe *sub)
{
    if (!gtk_tree_view_row_expanded(tree, path))
        gtk_tree_view_expand_row(tree, path, FALSE);
    else
        gtk_tree_view_collapse_row(tree, path);

}

static void
sub_row_expanded(GtkTreeView *tree, GtkTreeIter *iter, GtkTreePath *path, EMSubscribe *sub)
{
    EMSubscribeNode *node;
    GtkTreeIter child;
    GtkTreeModel *model = (GtkTreeModel *)gtk_tree_view_get_model(tree);
    char *row_name;

    gtk_tree_model_get(model, iter, 1, &row_name, -1);
    d(printf("%s:%s: row-expanded '%s'\n", G_STRLOC, G_STRFUNC,
         row_name?row_name:"<root>"));

    /* Do we really need to fetch the children for this row? */
    if (gtk_tree_model_iter_n_children(model, iter) > 1) {
        gtk_tree_model_get(model, iter, 2, &node, -1);
        if (node->path) {
            /* Mark it as already-processed path */
            gtk_tree_path_free(node->path);
            node->path=NULL;
        }
        return;
    } else {
        gtk_tree_model_iter_children(model, &child, iter);
        gtk_tree_model_get(model, &child, 2, &node, -1);
        if (!node) {
            /* This is the place holder node, delete it and fire-up a pending */
            gtk_tree_store_remove((GtkTreeStore *)model, &child);
            gtk_tree_model_get(model, iter, 2, &node, -1);
        } else {
            gtk_tree_model_get(model, iter, 2, &node, -1);
            if (node->path) {
                /* Mark it as already-processed path */
                gtk_tree_path_free(node->path);
                node->path=NULL;
            }
            return;
        }
    }

    e_dlist_addhead(&sub->pending, (EDListNode *)node);

    if (sub->pending_id == -1
        && (node = (EMSubscribeNode *)e_dlist_remtail(&sub->pending)))
        sub_queue_fill_level(sub, node);
}

static void
sub_destroy(GtkWidget *w, EMSubscribe *sub)
{
    struct _zsubscribe_msg *m;
    MailMsgListNode *msgListNode;   

    d(printf("subscribe closed\n"));
    sub->cancel = TRUE;

    if (sub->pending_id != -1)
        mail_msg_cancel(sub->pending_id);

    if (sub->subscribe_id != -1)
        mail_msg_cancel(sub->subscribe_id);

    while ( (msgListNode = (MailMsgListNode *)e_dlist_remhead(&sub->subscribe))) {
        m = (struct _zsubscribe_msg *) msgListNode->msg;
        /* Free the memory of MailMsgListNode which won't be used anymore. */
        g_free(msgListNode);
        mail_msg_unref(m);
    }

    sub_unref(sub);
}

static EMSubscribe *
subscribe_new(EMSubscribeEditor *se, const char *uri)
{
    EMSubscribe *sub;

    sub = g_malloc0(sizeof(*sub));
    sub->store_uri = g_strdup(uri);
    sub->editor = se;
    sub->ref_count = 1;
    sub->pending_id = -1;
    e_dlist_init(&sub->pending);
    sub->subscribe_id = -1;
    e_dlist_init(&sub->subscribe);
    sub->store_id = -1;

    return sub;
}

static void
subscribe_set_store(EMSubscribe *sub, CamelStore *store)
{
    if (store == NULL || !camel_store_supports_subscriptions(store)) {
        GtkWidget *w = gtk_label_new(_("This store does not support subscriptions, or they are not enabled."));

        gtk_label_set_line_wrap((GtkLabel *)w, TRUE);
        sub->widget = gtk_viewport_new(NULL, NULL);
        gtk_viewport_set_shadow_type((GtkViewport *)sub->widget, GTK_SHADOW_IN);
        gtk_container_add((GtkContainer *)sub->widget, w);
        gtk_widget_show(w);
        gtk_widget_show(sub->widget);
    } else {
        GtkTreeSelection *selection;
        GtkCellRenderer *renderer;
        GtkTreeStore *model;

        sub->store = store;
        camel_object_ref(store);
        sub->folders = g_hash_table_new_full (
            g_str_hash, g_str_equal,
            (GDestroyNotify) NULL,
            (GDestroyNotify) sub_node_free);

        model = gtk_tree_store_new (3, G_TYPE_BOOLEAN, G_TYPE_STRING, G_TYPE_POINTER);
        sub->tree = (GtkTreeView *) gtk_tree_view_new_with_model ((GtkTreeModel *) model);
        g_object_unref (model);
        gtk_widget_show ((GtkWidget *)sub->tree);

        sub->widget = gtk_scrolled_window_new (NULL, NULL);
        gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (sub->widget), GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);
        gtk_scrolled_window_set_shadow_type (GTK_SCROLLED_WINDOW (sub->widget), GTK_SHADOW_IN);
        gtk_container_add((GtkContainer *)sub->widget, (GtkWidget *)sub->tree);
        gtk_widget_show(sub->widget);

        renderer = gtk_cell_renderer_toggle_new ();
        g_object_set(renderer, "activatable", TRUE, NULL);
        gtk_tree_view_insert_column_with_attributes (sub->tree, -1, _("Subscribed"), renderer, "active", 0, NULL);
        g_signal_connect(renderer, "toggled", G_CALLBACK(sub_subscribe_toggled), sub);

        renderer = gtk_cell_renderer_text_new ();
        gtk_tree_view_insert_column_with_attributes (sub->tree, -1, _("Folder"), renderer, "text", 1, NULL);
        gtk_tree_view_set_expander_column(sub->tree, gtk_tree_view_get_column(sub->tree, 1));

        selection = gtk_tree_view_get_selection (sub->tree);
        gtk_tree_selection_set_mode (selection, GTK_SELECTION_MULTIPLE);
        gtk_tree_view_set_headers_visible (sub->tree, FALSE);

        g_signal_connect(sub->tree, "row-expanded", G_CALLBACK(sub_row_expanded), sub);
        g_signal_connect(sub->tree, "row-activated", G_CALLBACK(sub_row_activated), sub);
        g_signal_connect(sub->tree, "destroy", G_CALLBACK(sub_destroy), sub);

        sub_selection_changed(selection, sub);
        g_signal_connect(selection, "changed", G_CALLBACK(sub_selection_changed), sub);

        sub_queue_fill_level(sub, NULL);
    }

    gtk_box_pack_start((GtkBox *)sub->editor->vbox, sub->widget, TRUE, TRUE, 0);
}

static void
sub_editor_destroy(GtkWidget *w, EMSubscribeEditor *se)
{
    /* need to clean out pending store opens */
    d(printf("editor destroyed, freeing editor\n"));
    if (se->busy_id)
        g_source_remove(se->busy_id);

    g_free(se);
}

static void
sub_editor_close(GtkWidget *w, EMSubscribeEditor *se)
{
    gtk_widget_destroy((GtkWidget *)se->dialog);
}

static void
sub_editor_refresh(GtkWidget *w, EMSubscribeEditor *se)
{
    EMSubscribe *sub = se->current;
    GSList *l;

    d(printf("sub editor refresh?\n"));
    if (sub == NULL || sub->store == NULL)
        return;

    sub->seq++;

    /* drop any currently pending */
    if (sub->pending_id != -1) {
        mail_msg_cancel(sub->pending_id);
        mail_msg_wait(sub->pending_id);
    }

    gtk_tree_store_clear((GtkTreeStore *)gtk_tree_view_get_model(sub->tree));

    e_dlist_init(&sub->pending);

    if (sub->folders)
        g_hash_table_destroy(sub->folders);
    sub->folders = g_hash_table_new_full (
        g_str_hash, g_str_equal,
        (GDestroyNotify) NULL,
        (GDestroyNotify) sub_node_free);

    l = sub->info_list;
    sub->info_list = NULL;
    while (l) {
        GSList *n = l->next;

        camel_store_free_folder_info(sub->store, (CamelFolderInfo *)l->data);
        g_slist_free_1(l);
        l = n;
    }

    sub_queue_fill_level(sub, NULL);
}

static void
sub_editor_got_store(char *uri, CamelStore *store, void *data)
{
    struct _EMSubscribe *sub = data;

    if (!sub->cancel)
        subscribe_set_store(sub, store);
    sub_unref(sub);
}

static void
sub_editor_combobox_changed (GtkWidget *w, EMSubscribeEditor *se)
{
    int i, n;
    struct _EMSubscribe *sub;

    d(printf("combobox changed\n"));

    i = 1;
    n = gtk_combo_box_get_active (GTK_COMBO_BOX (se->combobox));
    if (n == 0) {
        gtk_widget_show (se->none_selected);
    } else {
        GtkTreeIter iter;
        GtkTreeModel *model;

        gtk_widget_hide (se->none_selected);

        model = gtk_combo_box_get_model (GTK_COMBO_BOX (se->combobox));
        if (gtk_tree_model_get_iter_first (model, &iter)) {
            /* hide the first item */
            gtk_list_store_set (
                GTK_LIST_STORE (model), &iter,
                1, FALSE,
                -1);
        }
    }

    se->current = NULL;
    sub = (struct _EMSubscribe *)se->stores.head;
    while (sub->next) {
        if (i == n) {
            se->current = sub;
            if (sub->widget) {
                gtk_widget_show(sub->widget);
            } else if (sub->store_id == -1) {
                sub_ref(sub);
                sub->store_id = mail_get_store(sub->store_uri, NULL, sub_editor_got_store, sub);
            }
        } else {
            if (sub->widget)
                gtk_widget_hide(sub->widget);
        }
        i++;
        sub = sub->next;
    }
}

static gboolean sub_editor_timeout(EMSubscribeEditor *se)
{
    gtk_progress_bar_pulse((GtkProgressBar *)se->progress);

    return TRUE;
}

static void sub_editor_busy(EMSubscribeEditor *se, int dir)
{
    int was;

    was = se->busy != 0;
    se->busy += dir;
    if (was && !se->busy) {
        g_source_remove(se->busy_id);
        se->busy_id = 0;
        gtk_widget_hide(se->progress);
    } else if (!was && se->busy) {
        se->busy_id = g_timeout_add(1000/5, (GSourceFunc)sub_editor_timeout, se);
        gtk_widget_show(se->progress);
    }
}


#define DEFAULT_WIDTH  600
#define DEFAULT_HEIGHT 400

static GtkAllocation window_size = { 0, 0, 0, 0 };

static void
window_size_allocate (GtkWidget *widget, GtkAllocation *allocation)
{
    GConfClient *gconf;

    /* save to in-memory variable for current session access */
    window_size = *allocation;

    /* save the setting across sessions */
    gconf = gconf_client_get_default ();
    gconf_client_set_int (gconf, "/apps/evolution/mail/subscribe_window/width", window_size.width, NULL);
    gconf_client_set_int (gconf, "/apps/evolution/mail/subscribe_window/height", window_size.height, NULL);
    g_object_unref (gconf);
}

GtkDialog *em_subscribe_editor_new(void)
{
    EMSubscribeEditor *se;
    EAccountList *accounts;
    EIterator *iter;
    GladeXML *xml;
    GtkWidget *w;
    GtkCellRenderer *cell;
    GtkListStore *store;
    GtkTreeIter gtiter;
    char *gladefile;

    se = g_malloc0(sizeof(*se));
    e_dlist_init(&se->stores);

    gladefile = g_build_filename (EVOLUTION_GLADEDIR,
                      "mail-dialogs.glade",
                      NULL);
    xml = glade_xml_new (gladefile, "subscribe_dialog", NULL);
    g_free (gladefile);

    if (xml == NULL) {
        /* ?? */
        return NULL;
    }
    se->dialog = (GtkDialog *)glade_xml_get_widget (xml, "subscribe_dialog");
    g_signal_connect(se->dialog, "destroy", G_CALLBACK(sub_editor_destroy), se);

    gtk_widget_ensure_style ((GtkWidget *)se->dialog);
    gtk_container_set_border_width ((GtkContainer *) ((GtkDialog *)se->dialog)->action_area, 12);
    gtk_container_set_border_width ((GtkContainer *) ((GtkDialog *)se->dialog)->vbox, 0);

    se->vbox = glade_xml_get_widget(xml, "tree_box");

    /* FIXME: This is just to get the shadow, is there a better way? */
    w = gtk_label_new(_("Please select a server."));
    se->none_selected = gtk_viewport_new(NULL, NULL);
    gtk_viewport_set_shadow_type((GtkViewport *)se->none_selected, GTK_SHADOW_IN);
    gtk_container_add((GtkContainer *)se->none_selected, w);
    gtk_widget_show(w);

    gtk_box_pack_start((GtkBox *)se->vbox, se->none_selected, TRUE, TRUE, 0);
    gtk_widget_show(se->none_selected);

    se->progress = glade_xml_get_widget(xml, "progress_bar");
    gtk_widget_hide(se->progress);

    w = glade_xml_get_widget(xml, "close_button");
    g_signal_connect(w, "clicked", G_CALLBACK(sub_editor_close), se);

    w = glade_xml_get_widget(xml, "refresh_button");
    g_signal_connect(w, "clicked", G_CALLBACK(sub_editor_refresh), se);

    /* setup stores combobox */
    se->combobox = glade_xml_get_widget (xml, "store_combobox");
    store = gtk_list_store_new (2, G_TYPE_STRING, G_TYPE_BOOLEAN);
    gtk_combo_box_set_model (GTK_COMBO_BOX (se->combobox), GTK_TREE_MODEL (store));
    g_object_unref (store);

    gtk_cell_layout_clear (GTK_CELL_LAYOUT (se->combobox));

    cell = gtk_cell_renderer_text_new ();
    gtk_cell_layout_pack_start (GTK_CELL_LAYOUT (se->combobox), cell, TRUE);
    gtk_cell_layout_set_attributes (GTK_CELL_LAYOUT (se->combobox), cell,
                                  "text", 0,
                                  "visible", 1,
                                  NULL);

    gtk_list_store_append (store, &gtiter);
    gtk_list_store_set (
        store, &gtiter,
        0, _("No server has been selected"),
        1, TRUE,
        -1);

    accounts = mail_config_get_accounts ();
    for (iter = e_list_get_iterator ((EList *) accounts);
         e_iterator_is_valid (iter);
         e_iterator_next (iter)) {
        EAccount *account = (EAccount *) e_iterator_get (iter);

        /* setup url table, and store table? */
        if (account->enabled && account->source->url) {
            d(printf("adding account '%s'\n", account->name));
            gtk_list_store_append (store, &gtiter);
            gtk_list_store_set (
                store, &gtiter,
                0, account->name,
                1, TRUE,
                -1);
            e_dlist_addtail(&se->stores, (EDListNode *)subscribe_new(se, account->source->url));
        } else {
            d(printf("not adding account '%s'\n", account->name));
        }
    }
    g_object_unref(iter);

    gtk_combo_box_set_active (GTK_COMBO_BOX (se->combobox), 0);
    g_signal_connect(se->combobox, "changed", G_CALLBACK(sub_editor_combobox_changed), se);

    if (window_size.width == 0) {
        /* initialize @window_size with the previous session's size */
        GConfClient *gconf;
        GError *err = NULL;

        gconf = gconf_client_get_default ();

        window_size.width = gconf_client_get_int (gconf, "/apps/evolution/mail/subscribe_window/width", &err);
        if (err != NULL) {
            window_size.width = DEFAULT_WIDTH;
            g_clear_error (&err);
        }

        window_size.height = gconf_client_get_int (gconf, "/apps/evolution/mail/subscribe_window/height", &err);
        if (err != NULL) {
            window_size.height = DEFAULT_HEIGHT;
            g_clear_error (&err);
        }

        g_object_unref (gconf);
    }

    gtk_window_set_default_size ((GtkWindow *) se->dialog, window_size.width, window_size.height);
    g_signal_connect (se->dialog, "size-allocate", G_CALLBACK (window_size_allocate), NULL);

    return se->dialog;
}