path: root/mail/message-list.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 * message-list.c: Displays the messages.
 *                 Implements CORBA's Evolution::MessageList
 *
 * Author:
 *     Miguel de Icaza (miguel@helixcode.com)
 *     Bertrand Guiheneuf (bg@aful.org)
 *
 * (C) 2000 Helix Code, Inc.
 */
#include <config.h>
#include <gnome.h>
#include <bonobo/bonobo-main.h>
#include "e-util/e-util.h"
#include "e-util/e-gui-utils.h"
#include "camel/camel-exception.h"
#include <camel/camel-folder.h>
#include "message-list.h"
#include "message-thread.h"
#include "Mail.h"
#include "widgets/e-table/e-table-header-item.h"
#include "widgets/e-table/e-table-item.h"

#include "art/mail-new.xpm"
#include "art/mail-read.xpm"
#include "art/mail-replied.xpm"
#include "art/attachment.xpm"
#include "art/empty.xpm"
#include "art/tree-expanded.xpm"
#include "art/tree-unexpanded.xpm"

/*
 * Default sizes for the ETable display
 *
 */
#define N_CHARS(x) (CHAR_WIDTH * (x))

#define COL_ICON_WIDTH         (16)
#define COL_CHECK_BOX_WIDTH    (16)
#define COL_FROM_EXPANSION     (24.0)
#define COL_FROM_WIDTH_MIN     (32)
#define COL_SUBJECT_EXPANSION  (30.0)
#define COL_SUBJECT_WIDTH_MIN  (32)
#define COL_SENT_EXPANSION     (24.0)
#define COL_SENT_WIDTH_MIN     (32)
#define COL_RECEIVED_EXPANSION (20.0)
#define COL_RECEIVED_WIDTH_MIN (32)
#define COL_TO_EXPANSION       (24.0)
#define COL_TO_WIDTH_MIN       (32)
#define COL_SIZE_EXPANSION     (6.0)
#define COL_SIZE_WIDTH_MIN     (32)

#define PARENT_TYPE (bonobo_object_get_type ())

static BonoboObjectClass *message_list_parent_class;
static POA_Evolution_MessageList__vepv evolution_message_list_vepv;

static void on_cursor_change_cmd (ETableScrolled *table, int row, gpointer user_data);
static void select_row (ETableScrolled *table, gpointer user_data);
static void select_msg (MessageList *message_list, gint row);
static char *filter_date (const void *data);

static struct {
    char **image_base;
    GdkPixbuf  *pixbuf;
} states_pixmaps [] = {
    { mail_new_xpm,     NULL },
    { mail_read_xpm,    NULL },
    { mail_replied_xpm, NULL },
    { empty_xpm,        NULL },
    { attachment_xpm,   NULL },
    { tree_expanded_xpm,    NULL },
    { tree_unexpanded_xpm,  NULL },
    { NULL,         NULL }
};

/* Gets the CamelMessageInfo for the message displayed at the given
 * view row.
 */
static const CamelMessageInfo *
get_message_info (MessageList *message_list, int row)
{
    ETreeModel *model = (ETreeModel *)message_list->table_model;
    ETreePath *node;
    char *uid;

    if (row >= e_table_model_row_count (message_list->table_model))
        return NULL;

    node = e_tree_model_node_at_row (model, row);
    g_return_val_if_fail (node != NULL, NULL);
    uid = e_tree_model_node_get_data (model, node);

    if (strncmp (uid, "uid:", 4) != 0)
        return NULL;
    uid += 4;

    return camel_folder_get_message_info (message_list->folder, uid);
}

/**
 * message_list_select:
 * @message_list: a MessageList
 * @base_row: the row to start from
 * @direction: the direction to search in
 * @flags: a set of flag values
 * @mask: a mask for comparing against @flags
 *
 * This moves the message list selection to a suitable row. @base_row
 * lists the first row to try, and @flags and @mask combine to specify
 * what constitutes a suitable row. @direction is
 * %MESSAGE_LIST_SELECT_NEXT if it should find the next matching
 * message, or %MESSAGE_LIST_SELECT_PREVIOUS if it should find the
 * previous. If no suitable row is found, the selection will be
 * unchanged but the message display will be cleared.
 **/
void
message_list_select (MessageList *message_list, int base_row,
             MessageListSelectDirection direction,
             guint32 flags, guint32 mask)
{
    const CamelMessageInfo *info;
    int last;

    if (direction == MESSAGE_LIST_SELECT_PREVIOUS)
        last = 0;
    else
        last = e_table_model_row_count (message_list->table_model);

    while (base_row != last) {
        base_row += direction;
        info = get_message_info (message_list, base_row);
        if (info && (info->flags & mask) == flags) {
            e_table_scrolled_set_cursor_row (E_TABLE_SCROLLED (message_list->etable),
                             base_row);
            return;
        }
    }

    mail_display_set_message (message_list->parent_folder_browser->mail_display, NULL);
}

static gint
mark_msg_seen (gpointer data)
{
    MessageList *ml = data;
    guint32 flags;

    if (!ml->cursor_uid)
        return FALSE;

    flags = camel_folder_get_message_flags (ml->folder, ml->cursor_uid);
    camel_folder_set_message_flags (ml->folder, ml->cursor_uid,
                    CAMEL_MESSAGE_SEEN,
                    CAMEL_MESSAGE_SEEN);
    return FALSE;
}

/* select a message and display it */
static void
select_msg (MessageList *message_list, gint row)
{
    CamelException ex;
    CamelMimeMessage *message;
    const CamelMessageInfo *msg_info;
    MailDisplay *md = message_list->parent_folder_browser->mail_display;

    camel_exception_init (&ex);

    msg_info = get_message_info (message_list, row);
    if (msg_info) {
        message = camel_folder_get_message (message_list->folder, 
                            msg_info->uid, &ex);
        if (camel_exception_get_id (&ex)) {
            printf ("Unable to get message: %s\n",
                ex.desc?ex.desc:"unknown_reason");
            return;
        }

        if (message_list->seen_id)
            gtk_timeout_remove (message_list->seen_id);

        mail_display_set_message (md, CAMEL_MEDIUM (message));
        gtk_object_unref (GTK_OBJECT (message));

        message_list->seen_id =
            gtk_timeout_add (1500, mark_msg_seen, message_list);
    } else
        mail_display_set_message (md, NULL);
}


static GdkPixbuf *
ml_tree_icon_at (ETreeModel *etm, ETreePath *path, void *model_data)
{
    /* we dont really need an icon ... */
    return NULL;
}

static void *
ml_tree_value_at (ETreeModel *etm, ETreePath *path, int col, void *model_data)
{
    MessageList *message_list = model_data;
    const CamelMessageInfo *msg_info;
    static char buffer [10];
    char *uid;

    /* retrieve the message information array */
    uid = e_tree_model_node_get_data (etm, path);
    if (strncmp (uid, "uid:", 4) != 0)
        goto fake;
    uid += 4;

    msg_info = camel_folder_get_message_info (message_list->folder, uid);
    g_return_val_if_fail (msg_info != NULL, NULL);

    switch (col){
    case COL_ONLINE_STATUS:
        return GINT_TO_POINTER (0);
        
    case COL_MESSAGE_STATUS:
        if (msg_info->flags & CAMEL_MESSAGE_ANSWERED)
            return GINT_TO_POINTER (2);
        else if (msg_info->flags & CAMEL_MESSAGE_SEEN)
            return GINT_TO_POINTER (1);
        else
            return GINT_TO_POINTER (0);
        
    case COL_PRIORITY:
        return GINT_TO_POINTER (1);
        
    case COL_ATTACHMENT:
        return GINT_TO_POINTER (0);
        
    case COL_FROM:
        if (msg_info->from)
            return msg_info->from;
        else
            return "";
        
    case COL_SUBJECT:
        if (msg_info->subject)
            return msg_info->subject;
        else
            return "";
        
    case COL_SENT:
        return GINT_TO_POINTER (msg_info->date_sent);
        
    case COL_RECEIVED:
        return GINT_TO_POINTER (msg_info->date_received);
        
    case COL_TO:
        if (msg_info->to)
            return msg_info->to;
        else
            return "";
        
    case COL_SIZE:
        sprintf (buffer, "%d", msg_info->size);
        return buffer;
            
    case COL_DELETED:
        return GINT_TO_POINTER(!!(msg_info->flags & CAMEL_MESSAGE_DELETED));

    case COL_UNREAD:
        return GINT_TO_POINTER(!(msg_info->flags & CAMEL_MESSAGE_SEEN));
    }

    g_assert_not_reached ();

 fake:
    /* This is a fake tree parent */
    switch (col){
    case COL_ONLINE_STATUS:
    case COL_MESSAGE_STATUS:
    case COL_PRIORITY:
    case COL_ATTACHMENT:
    case COL_DELETED:
    case COL_UNREAD:
    case COL_SENT:
    case COL_RECEIVED:
        return (void *) 0;

    case COL_SUBJECT:
        return strchr (uid, ':') + 1;

    case COL_FROM:
    case COL_TO:
    case COL_SIZE:
        return "?";
    }
    g_assert_not_reached ();

    return NULL;
}

static void
ml_tree_set_value_at (ETreeModel *etm, ETreePath *path, int col,
              const void *val, void *model_data)
{
    MessageList *message_list = model_data;
    const CamelMessageInfo *msg_info;
    char *uid;

    if (col != COL_MESSAGE_STATUS)
        return;

    uid = e_tree_model_node_get_data (etm, path);
    if (strncmp (uid, "uid:", 4) != 0)
        return;
    uid += 4;

    msg_info = camel_folder_get_message_info (message_list->folder, uid);
    if (!msg_info)
        return;

    camel_folder_set_message_flags (message_list->folder, msg_info->uid,
                    CAMEL_MESSAGE_SEEN, ~msg_info->flags);
    if (message_list->seen_id) {
        gtk_timeout_remove (message_list->seen_id);
        message_list->seen_id = 0;
    }
}

static gboolean
ml_tree_is_cell_editable (ETreeModel *etm, ETreePath *path, int col, void *model_data)
{
    return col == COL_MESSAGE_STATUS;
}

static void
message_list_init_images (void)
{
    int i;

    /*
     * Only load once, and share
     */
    if (states_pixmaps [0].pixbuf)
        return;
    
    for (i = 0; states_pixmaps [i].image_base; i++){
        states_pixmaps [i].pixbuf = gdk_pixbuf_new_from_xpm_data (
            (const char **) states_pixmaps [i].image_base);
    }
}

static char *
filter_date (const void *data)
{
    time_t date = GPOINTER_TO_INT (data);
    char buf[26], *p;

    if (date == 0)
        return g_strdup ("?");

#ifdef CTIME_R_THREE_ARGS
    ctime_r (&date, buf, 26);
#else
    ctime_r (&date, buf);
#endif

    p = strchr (buf, '\n');
    if (p)
        *p = '\0';

    return g_strdup (buf);
}

static void
message_list_init_renderers (MessageList *message_list)
{
    GdkPixbuf *images [3];

    g_assert (message_list);
    g_assert (message_list->table_model);

    message_list->render_text = e_cell_text_new (
        message_list->table_model,
        NULL, GTK_JUSTIFY_LEFT);

    gtk_object_set(GTK_OBJECT(message_list->render_text),
               "strikeout_column", COL_DELETED,
               NULL);
    gtk_object_set(GTK_OBJECT(message_list->render_text),
               "bold_column", COL_UNREAD,
               NULL);

    message_list->render_date = e_cell_text_new (
        message_list->table_model,
        NULL, GTK_JUSTIFY_LEFT);

    gtk_object_set(GTK_OBJECT(message_list->render_date),
               "text_filter", filter_date,
               NULL);
    gtk_object_set(GTK_OBJECT(message_list->render_date),
               "strikeout_column", COL_DELETED,
               NULL);
    gtk_object_set(GTK_OBJECT(message_list->render_date),
               "bold_column", COL_UNREAD,
               NULL);

    message_list->render_online_status = e_cell_checkbox_new ();

    /*
     * Message status
     */
    images [0] = states_pixmaps [0].pixbuf;
    images [1] = states_pixmaps [1].pixbuf;
    images [2] = states_pixmaps [2].pixbuf;

    message_list->render_message_status = e_cell_toggle_new (0, 3, images);

    /*
     * Attachment
     */
    images [0] = states_pixmaps [3].pixbuf;
    images [1] = states_pixmaps [4].pixbuf;

    message_list->render_attachment = e_cell_toggle_new (0, 2, images);
    
    /*
     * FIXME: We need a real renderer here
     */
    message_list->render_priority = e_cell_checkbox_new ();

    /*
     * for tree view
     */
    message_list->render_tree =
        e_cell_tree_new (message_list->table_model,
                 states_pixmaps[5].pixbuf,
                 states_pixmaps[6].pixbuf,
                 TRUE, message_list->render_text);
}

static void
message_list_init_header (MessageList *message_list)
{
    int i;
    
    /*
     * FIXME:
     *
     * Use the font metric to compute this.
     */
    
    message_list->header_model = e_table_header_new ();
    gtk_object_ref (GTK_OBJECT (message_list->header_model));
    gtk_object_sink (GTK_OBJECT (message_list->header_model));

    message_list->table_cols [COL_ONLINE_STATUS] =
        e_table_col_new (
            COL_ONLINE_STATUS, _("Online Status"),
            0.0, COL_CHECK_BOX_WIDTH,
            message_list->render_online_status,
            g_int_compare, FALSE);
    
    message_list->table_cols [COL_MESSAGE_STATUS] =
        e_table_col_new_with_pixbuf (
            COL_MESSAGE_STATUS, states_pixmaps [0].pixbuf,
            0.0, COL_CHECK_BOX_WIDTH,
            message_list->render_message_status, 
            g_int_compare, FALSE);

    gtk_object_set(GTK_OBJECT(message_list->table_cols[COL_MESSAGE_STATUS]),
               "sortable", FALSE,
               NULL);

    message_list->table_cols [COL_PRIORITY] =
        e_table_col_new (
            COL_PRIORITY, _("Priority"),
            0.0, COL_CHECK_BOX_WIDTH,
            message_list->render_priority,
            g_int_compare, FALSE);
    
    message_list->table_cols [COL_ATTACHMENT] =
        e_table_col_new_with_pixbuf (
            COL_ATTACHMENT, states_pixmaps [4].pixbuf,
            0.0, COL_ICON_WIDTH,
            message_list->render_attachment,
            g_int_compare, FALSE);

    gtk_object_set(GTK_OBJECT(message_list->table_cols[COL_ATTACHMENT]),
               "sortable", FALSE,
               NULL);

    message_list->table_cols [COL_FROM] =
        e_table_col_new (
            COL_FROM, _("From"),
            COL_FROM_EXPANSION, COL_FROM_WIDTH_MIN,
            message_list->render_text,
            g_str_compare, TRUE);

    message_list->table_cols [COL_SUBJECT] =
        e_table_col_new (
            COL_SUBJECT, _("Subject"),
            COL_SUBJECT_EXPANSION, COL_SUBJECT_WIDTH_MIN,
            message_list->render_tree,
            g_str_compare, TRUE);

    message_list->table_cols [COL_SENT] =
        e_table_col_new (
            COL_SENT, _("Date"),
            COL_SENT_EXPANSION, COL_SENT_WIDTH_MIN,
            message_list->render_date,
            g_int_compare, TRUE);
    
    message_list->table_cols [COL_RECEIVED] =
        e_table_col_new (
            COL_RECEIVED, _("Received"),
            COL_RECEIVED_EXPANSION, COL_RECEIVED_WIDTH_MIN,
            message_list->render_date,
            g_int_compare, TRUE);

    message_list->table_cols [COL_TO] =
        e_table_col_new (
            COL_TO, _("To"),
            COL_TO_EXPANSION, COL_TO_WIDTH_MIN,
            message_list->render_text,
            g_str_compare, TRUE);

    message_list->table_cols [COL_SIZE] =
        e_table_col_new (
            COL_SIZE, _("Size"),
            COL_SIZE_EXPANSION, COL_SIZE_WIDTH_MIN,
            message_list->render_text,
            g_str_compare, TRUE);
    
    for (i = 0; i < COL_LAST; i++) {
        gtk_object_ref (GTK_OBJECT (message_list->table_cols [i]));
        e_table_header_add_column (message_list->header_model,
                       message_list->table_cols [i], i);
    }
}

static char *
message_list_get_layout (MessageList *message_list)
{
    /* Message status, From, Subject, Sent Date */
    return g_strdup ("<ETableSpecification> <columns-shown> <column> 1 </column> <column> 4 </column> <column> 5 </column> <column> 6 </column> </columns-shown> <grouping> </grouping> </ETableSpecification>");
}

/*
 * GtkObject::init
 */
static void
message_list_init (GtkObject *object)
{
    MessageList *message_list = MESSAGE_LIST (object);
    char *spec;

    message_list->table_model = (ETableModel *)
        e_tree_simple_new (ml_tree_icon_at, ml_tree_value_at,
                   ml_tree_set_value_at,
                   ml_tree_is_cell_editable,
                   message_list);
    e_tree_model_root_node_set_visible ((ETreeModel *)message_list->table_model, FALSE);

    message_list_init_renderers (message_list);
    message_list_init_header (message_list);

    /*
     * The etable
     */

    spec = message_list_get_layout (message_list);
    message_list->etable = e_table_scrolled_new (
        message_list->header_model, message_list->table_model, spec);
    g_free (spec);

    gtk_object_set(GTK_OBJECT(message_list->etable),
               "cursor_mode", E_TABLE_CURSOR_LINE,
               "drawfocus", FALSE,
               "drawgrid", FALSE,
               NULL);

    gtk_signal_connect (GTK_OBJECT (message_list->etable), "realize",
                GTK_SIGNAL_FUNC (select_row), message_list);
    
    gtk_signal_connect (GTK_OBJECT (message_list->etable), "cursor_change",
               GTK_SIGNAL_FUNC (on_cursor_change_cmd), message_list);

    gtk_widget_show (message_list->etable);
    
    gtk_object_ref (GTK_OBJECT (message_list->table_model));
    gtk_object_sink (GTK_OBJECT (message_list->table_model));
    
    /*
     * We do own the Etable, not some widget container
     */
    gtk_object_ref (GTK_OBJECT (message_list->etable));
    gtk_object_sink (GTK_OBJECT (message_list->etable));
}

static void
free_key (gpointer key, gpointer value, gpointer data)
{
    g_free (key);
}

static void
message_list_destroy (GtkObject *object)
{
    MessageList *message_list = MESSAGE_LIST (object);
    int i;

    
    gtk_object_unref (GTK_OBJECT (message_list->table_model));
    gtk_object_unref (GTK_OBJECT (message_list->header_model));
    
    /*
     * Renderers
     */
    gtk_object_unref (GTK_OBJECT (message_list->render_text));
    gtk_object_unref (GTK_OBJECT (message_list->render_online_status));
    gtk_object_unref (GTK_OBJECT (message_list->render_message_status));
    gtk_object_unref (GTK_OBJECT (message_list->render_priority));
    gtk_object_unref (GTK_OBJECT (message_list->render_attachment));
    gtk_object_unref (GTK_OBJECT (message_list->render_tree));
    
    gtk_object_unref (GTK_OBJECT (message_list->etable));

    if (message_list->uid_rowmap) {
        g_hash_table_foreach (message_list->uid_rowmap,
                      free_key, NULL);
        g_hash_table_destroy (message_list->uid_rowmap);
    }

    for (i = 0; i < COL_LAST; i++)
        gtk_object_unref (GTK_OBJECT (message_list->table_cols [i]));
    
    if (message_list->idle_id != 0)
        g_source_remove(message_list->idle_id);

    if (message_list->folder)
        gtk_object_unref (GTK_OBJECT (message_list->folder));

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

/*
 * CORBA method: Evolution::MessageList::select_message
 */
static void
MessageList_select_message (PortableServer_Servant _servant,
                const CORBA_long message_number,
                CORBA_Environment *ev)
{
    printf ("FIXME: select message method\n");
}

/*
 * CORBA method: Evolution::MessageList::open_message
 */
static void
MessageList_open_message (PortableServer_Servant _servant,
              const CORBA_long message_number,
              CORBA_Environment *ev)
{
    printf ("FIXME: open message method\n");
}

static POA_Evolution_MessageList__epv *
evolution_message_list_get_epv (void)
{
    POA_Evolution_MessageList__epv *epv;

    epv = g_new0 (POA_Evolution_MessageList__epv, 1);

    epv->select_message = MessageList_select_message;
    epv->open_message   = MessageList_open_message;

    return epv;
}

static void
message_list_corba_class_init (void)
{
    evolution_message_list_vepv.Bonobo_Unknown_epv = bonobo_object_get_epv ();
    evolution_message_list_vepv.Evolution_MessageList_epv = evolution_message_list_get_epv ();
}

/*
 * GtkObjectClass::init
 */
static void
message_list_class_init (GtkObjectClass *object_class)
{
    message_list_parent_class = gtk_type_class (PARENT_TYPE);

    object_class->destroy = message_list_destroy;

    message_list_corba_class_init ();

    message_list_init_images ();
}

static void
message_list_construct (MessageList *message_list, Evolution_MessageList corba_message_list)
{
    bonobo_object_construct (BONOBO_OBJECT (message_list), corba_message_list);
}

static Evolution_MessageList
create_corba_message_list (BonoboObject *object)
{
    POA_Evolution_MessageList *servant;
    CORBA_Environment ev;

    servant = (POA_Evolution_MessageList *) g_new0 (BonoboObjectServant, 1);
    servant->vepv = &evolution_message_list_vepv;

    CORBA_exception_init (&ev);
    POA_Evolution_MessageList__init ((PortableServer_Servant) servant, &ev);
    if (ev._major != CORBA_NO_EXCEPTION){
        g_free (servant);
        CORBA_exception_free (&ev);
        return CORBA_OBJECT_NIL;
    }

    CORBA_exception_free (&ev);
    return (Evolution_MessageList) bonobo_object_activate_servant (object, servant);
}

BonoboObject *
message_list_new (FolderBrowser *parent_folder_browser)
{
    Evolution_MessageList corba_object;
    MessageList *message_list;

    g_assert (parent_folder_browser);

    message_list = gtk_type_new (message_list_get_type ());

    corba_object = create_corba_message_list (BONOBO_OBJECT (message_list));
    if (corba_object == CORBA_OBJECT_NIL){
        gtk_object_destroy (GTK_OBJECT (message_list));
        return NULL;
    }

    message_list->parent_folder_browser = parent_folder_browser;

    message_list->idle_id = 0;

    message_list_construct (message_list, corba_object);

    return BONOBO_OBJECT (message_list);
}

/* only call if we have a tree model */
/* builds the tree structure */
static void
build_tree (MessageList *ml, ETreePath *parent, struct _container *c,
        int *row)
{
    ETreeModel *tree = E_TREE_MODEL (ml->table_model);
    ETreePath *node;
    char *id;

    while (c) {
        if (c->message) {
            id = g_strdup_printf ("uid:%s", c->message->uid);
            g_hash_table_insert (ml->uid_rowmap,
                         g_strdup (c->message->uid),
                         GINT_TO_POINTER ((*row)++));
        } else
            id = g_strdup_printf ("subject:%s", c->root_subject);
        node = e_tree_model_node_insert (tree, parent, 0, id);
        if (c->child) {
            /* by default, open all trees */
            e_tree_model_node_set_expanded (tree, node, TRUE);
            build_tree (ml, node, c->child, row);
        }
        c = c->next;
    }
}

static void
build_flat (MessageList *ml, ETreePath *parent, GPtrArray *uids)
{
    ETreeModel *tree = E_TREE_MODEL (ml->table_model);
    ETreePath *node;
    char *uid;
    int i;

    for (i = 0; i < uids->len; i++) {
        uid = g_strdup_printf ("uid:%s", (char *)uids->pdata[i]);
        node = e_tree_model_node_insert (tree, ml->tree_root, i, uid);
        g_hash_table_insert (ml->uid_rowmap, g_strdup (uids->pdata[i]),
                     GINT_TO_POINTER (i));
    }
}

void
message_list_regenerate (MessageList *message_list, const char *search)
{
    ETreeModel *etm = E_TREE_MODEL (message_list->table_model);
    GPtrArray *uids;
    int row = 0;

    e_table_model_pre_change(message_list->table_model);

    if (message_list->search) {
        g_free (message_list->search);
        message_list->search = NULL;
    }

    if (message_list->uid_rowmap) {
        g_hash_table_foreach (message_list->uid_rowmap,
                      free_key, NULL);
        g_hash_table_destroy (message_list->uid_rowmap);
    }
    message_list->uid_rowmap = g_hash_table_new (g_str_hash, g_str_equal);
    
    if (search && camel_folder_has_search_capability (message_list->folder)) {
        CamelException ex;
        
        camel_exception_init (&ex);
        uids = camel_folder_search_by_expression (message_list->folder,
                              search, &ex);
        if (camel_exception_is_set (&ex)) {
            e_notice (NULL, GNOME_MESSAGE_BOX_ERROR,
                  "Search failed: %s",
                  camel_exception_get_description (&ex));
            camel_exception_clear (&ex);
        } else
            message_list->search = g_strdup (search);
    } else
        uids = camel_folder_get_uids (message_list->folder);
    
    /* FIXME: free the old tree data */
    
    /* Clear the old contents, build the new */
    if (message_list->tree_root)
        e_tree_model_node_remove(etm, message_list->tree_root);
    message_list->tree_root =
        e_tree_model_node_insert(etm, NULL, 0, message_list);
    e_tree_model_node_set_expanded (etm, message_list->tree_root, TRUE);

    if (threaded_view) {
        struct _container *head;

        head = thread_messages (message_list->folder, uids);
        build_tree (message_list, message_list->tree_root, head, &row);
        thread_messages_free (head);
    } else
        build_flat (message_list, message_list->tree_root, uids);

    if (search) {
        g_strfreev ((char **)uids->pdata);
        g_ptr_array_free (uids, FALSE);
    } else
        camel_folder_free_uids (message_list->folder, uids);

    e_table_model_changed (message_list->table_model);
    select_msg (message_list, 0);
}

static void
folder_changed (CamelFolder *f, int type, MessageList *message_list)
{
    message_list_regenerate (message_list, message_list->search);
}

static void
message_changed (CamelFolder *f, const char *uid, MessageList *message_list)
{
    int row;

    row = GPOINTER_TO_INT (g_hash_table_lookup (message_list->uid_rowmap,
                            uid));
    if (row != -1)
        e_table_model_row_changed (message_list->table_model, row);
}

void
message_list_set_folder (MessageList *message_list, CamelFolder *camel_folder)
{
    CamelException ex;

    g_return_if_fail (message_list != NULL);
    g_return_if_fail (camel_folder != NULL);
    g_return_if_fail (IS_MESSAGE_LIST (message_list));
    g_return_if_fail (CAMEL_IS_FOLDER (camel_folder));
    g_return_if_fail (camel_folder_has_summary_capability (camel_folder));

    camel_exception_init (&ex);
    
    if (message_list->folder)
        gtk_object_unref (GTK_OBJECT (message_list->folder));

    message_list->folder = camel_folder;

    gtk_signal_connect(GTK_OBJECT (camel_folder), "folder_changed",
               folder_changed, message_list);
    gtk_signal_connect(GTK_OBJECT (camel_folder), "message_changed",
               message_changed, message_list);

    gtk_object_ref (GTK_OBJECT (camel_folder));

    folder_changed (camel_folder, 0, message_list);
}

GtkWidget *
message_list_get_widget (MessageList *message_list)
{
    return message_list->etable;
}

E_MAKE_TYPE (message_list, "MessageList", MessageList, message_list_class_init, message_list_init, PARENT_TYPE);

static gboolean
on_cursor_change_idle (gpointer data)
{
    MessageList *message_list = data;

    select_msg (message_list, message_list->cursor_row);

    message_list->idle_id = 0;
    return FALSE;
}

static void
on_cursor_change_cmd (ETableScrolled *table, int row, gpointer user_data)
{
    MessageList *message_list;
    const CamelMessageInfo *info;
    
    message_list = MESSAGE_LIST (user_data);
    
    message_list->cursor_row = row;
    info = get_message_info (message_list, row);
    message_list->cursor_uid = info ? info->uid : NULL;

    if (!message_list->idle_id)
        message_list->idle_id = g_idle_add_full (G_PRIORITY_LOW, on_cursor_change_idle, message_list, NULL);
}

/* FIXME: this is all a kludge. */
static gint
idle_select_row (gpointer user_data)
{
    e_table_scrolled_set_cursor_row (user_data, 0);
    return FALSE;
}

static void
select_row (ETableScrolled *table, gpointer user_data)
{
    MessageList *message_list = user_data;

    gtk_idle_add (idle_select_row, message_list->etable);
}


struct message_list_foreach_data {
    MessageList *message_list;
    MessageListForeachFunc callback;
    gpointer user_data;
};

static void
mlfe_callback (int row, gpointer user_data)
{
    struct message_list_foreach_data *mlfe_data = user_data;
    const CamelMessageInfo *info;

    info = get_message_info (mlfe_data->message_list, row);
    if (info) {
        mlfe_data->callback (mlfe_data->message_list,
                     info->uid,
                     mlfe_data->user_data);
    }
}

void
message_list_foreach (MessageList *message_list,
              MessageListForeachFunc callback,
              gpointer user_data)
{
    struct message_list_foreach_data mlfe_data;

    mlfe_data.message_list = message_list;
    mlfe_data.callback = callback;
    mlfe_data.user_data = user_data;
    e_table_scrolled_selected_row_foreach (E_TABLE_SCROLLED (message_list->etable),
                           mlfe_callback, &mlfe_data);
}

gboolean threaded_view = TRUE;

void
message_list_toggle_threads (BonoboUIHandler *uih, void *user_data,
                 const char *path)
{
    MessageList *ml = user_data;

    threaded_view = bonobo_ui_handler_menu_get_toggle_state (uih, path);
    message_list_regenerate (ml, ml->search);
}