path: root/e-util/e-attachment-view.c

/*
 * e-attachment-view.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.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 *
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

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

#include "e-attachment-view.h"

#include <glib/gi18n.h>
#include <gdk/gdkkeysyms.h>

#include "e-attachment-dialog.h"
#include "e-attachment-handler-image.h"
#include "e-misc-utils.h"
#include "e-selection.h"

enum {
    UPDATE_ACTIONS,
    LAST_SIGNAL
};

/* Note: Do not use the info field. */
static GtkTargetEntry target_table[] = {
    { (gchar *) "_NETSCAPE_URL", 0, 0 }
};

static const gchar *ui =
"<ui>"
"  <popup name='context'>"
"    <menuitem action='cancel'/>"
"    <menuitem action='save-as'/>"
"    <menuitem action='remove'/>"
"    <menuitem action='properties'/>"
"    <separator/>"
"    <placeholder name='inline-actions'>"
"      <menuitem action='show'/>"
"      <menuitem action='show-all'/>"
"      <separator/>"
"      <menuitem action='hide'/>"
"      <menuitem action='hide-all'/>"
"    </placeholder>"
"    <separator/>"
"    <placeholder name='custom-actions'/>"
"    <separator/>"
"    <menuitem action='add'/>"
"    <separator/>"
"    <placeholder name='open-actions'/>"
"    <menuitem action='open-with'/>"
"  </popup>"
"</ui>";

static gulong signals[LAST_SIGNAL];

G_DEFINE_INTERFACE (
    EAttachmentView,
    e_attachment_view,
    GTK_TYPE_WIDGET)

static void
action_add_cb (GtkAction *action,
               EAttachmentView *view)
{
    EAttachmentStore *store;
    gpointer parent;

    parent = gtk_widget_get_toplevel (GTK_WIDGET (view));
    parent = gtk_widget_is_toplevel (parent) ? parent : NULL;

    store = e_attachment_view_get_store (view);
    e_attachment_store_run_load_dialog (store, parent);
}

static void
action_cancel_cb (GtkAction *action,
                  EAttachmentView *view)
{
    EAttachment *attachment;
    GList *list;

    list = e_attachment_view_get_selected_attachments (view);
    g_return_if_fail (g_list_length (list) == 1);
    attachment = list->data;

    e_attachment_cancel (attachment);

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

static void
action_hide_cb (GtkAction *action,
                EAttachmentView *view)
{
    EAttachment *attachment;
    GList *list;

    list = e_attachment_view_get_selected_attachments (view);
    g_return_if_fail (g_list_length (list) == 1);
    attachment = list->data;

    e_attachment_set_shown (attachment, FALSE);

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

static void
action_hide_all_cb (GtkAction *action,
                    EAttachmentView *view)
{
    EAttachmentStore *store;
    GList *list, *iter;

    store = e_attachment_view_get_store (view);
    list = e_attachment_store_get_attachments (store);

    for (iter = list; iter != NULL; iter = iter->next) {
        EAttachment *attachment;

        attachment = E_ATTACHMENT (iter->data);
        e_attachment_set_shown (attachment, FALSE);
    }

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

static void
action_open_with_cb (GtkAction *action,
                     EAttachmentView *view)
{
    EAttachment *attachment;
    EAttachmentStore *store;
    GtkWidget *dialog;
    GtkTreePath *path;
    GtkTreeIter iter;
    GAppInfo *app_info = NULL;
    GFileInfo *file_info;
    GList *list;
    gpointer parent;
    const gchar *content_type;

    parent = gtk_widget_get_toplevel (GTK_WIDGET (view));
    parent = gtk_widget_is_toplevel (parent) ? parent : NULL;

    list = e_attachment_view_get_selected_paths (view);
    g_return_if_fail (g_list_length (list) == 1);
    path = list->data;

    store = e_attachment_view_get_store (view);
    gtk_tree_model_get_iter (GTK_TREE_MODEL (store), &iter, path);
    gtk_tree_model_get (
        GTK_TREE_MODEL (store), &iter,
        E_ATTACHMENT_STORE_COLUMN_ATTACHMENT, &attachment, -1);
    g_return_if_fail (E_IS_ATTACHMENT (attachment));

    file_info = e_attachment_ref_file_info (attachment);
    g_return_if_fail (file_info != NULL);

    content_type = g_file_info_get_content_type (file_info);

    dialog = gtk_app_chooser_dialog_new_for_content_type (
        parent, 0, content_type);
    if (gtk_dialog_run (GTK_DIALOG (dialog)) == GTK_RESPONSE_OK) {
        GtkAppChooser *app_chooser = GTK_APP_CHOOSER (dialog);
        app_info = gtk_app_chooser_get_app_info (app_chooser);
    }
    gtk_widget_destroy (dialog);

    if (app_info != NULL) {
        e_attachment_view_open_path (view, path, app_info);
        g_object_unref (app_info);
    }

    g_object_unref (file_info);

    g_list_foreach (list, (GFunc) gtk_tree_path_free, NULL);
    g_list_free (list);
}

static void
action_open_with_app_info_cb (GtkAction *action,
                              EAttachmentView *view)
{
    GAppInfo *app_info;
    GtkTreePath *path;
    GList *list;

    list = e_attachment_view_get_selected_paths (view);
    g_return_if_fail (g_list_length (list) == 1);
    path = list->data;

    app_info = g_object_get_data (G_OBJECT (action), "app-info");
    g_return_if_fail (G_IS_APP_INFO (app_info));

    e_attachment_view_open_path (view, path, app_info);

    g_list_foreach (list, (GFunc) gtk_tree_path_free, NULL);
    g_list_free (list);
}

static void
action_properties_cb (GtkAction *action,
                      EAttachmentView *view)
{
    EAttachment *attachment;
    GtkWidget *dialog;
    GList *list;
    gpointer parent;

    list = e_attachment_view_get_selected_attachments (view);
    g_return_if_fail (g_list_length (list) == 1);
    attachment = list->data;

    parent = gtk_widget_get_toplevel (GTK_WIDGET (view));
    parent = gtk_widget_is_toplevel (parent) ? parent : NULL;

    dialog = e_attachment_dialog_new (parent, attachment);
    gtk_dialog_run (GTK_DIALOG (dialog));
    gtk_widget_destroy (dialog);

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

static void
action_remove_cb (GtkAction *action,
                  EAttachmentView *view)
{
    e_attachment_view_remove_selected (view, FALSE);
}

static void
action_save_all_cb (GtkAction *action,
                    EAttachmentView *view)
{
    EAttachmentStore *store;
    GList *list, *iter;
    GFile *destination;
    gpointer parent;

    store = e_attachment_view_get_store (view);

    parent = gtk_widget_get_toplevel (GTK_WIDGET (view));
    parent = gtk_widget_is_toplevel (parent) ? parent : NULL;

    /* XXX We lose the previous selection. */
    e_attachment_view_select_all (view);
    list = e_attachment_view_get_selected_attachments (view);
    e_attachment_view_unselect_all (view);

    destination = e_attachment_store_run_save_dialog (
        store, list, parent);

    if (destination == NULL)
        goto exit;

    for (iter = list; iter != NULL; iter = iter->next) {
        EAttachment *attachment = iter->data;

        e_attachment_save_async (
            attachment, destination, (GAsyncReadyCallback)
            e_attachment_save_handle_error, parent);
    }

    g_object_unref (destination);

exit:
    g_list_foreach (list, (GFunc) g_object_unref, NULL);
    g_list_free (list);
}

static void
action_save_as_cb (GtkAction *action,
                   EAttachmentView *view)
{
    EAttachmentStore *store;
    GList *list, *iter;
    GFile *destination;
    gpointer parent;

    store = e_attachment_view_get_store (view);

    parent = gtk_widget_get_toplevel (GTK_WIDGET (view));
    parent = gtk_widget_is_toplevel (parent) ? parent : NULL;

    list = e_attachment_view_get_selected_attachments (view);

    destination = e_attachment_store_run_save_dialog (
        store, list, parent);

    if (destination == NULL)
        goto exit;

    for (iter = list; iter != NULL; iter = iter->next) {
        EAttachment *attachment = iter->data;

        e_attachment_save_async (
            attachment, destination, (GAsyncReadyCallback)
            e_attachment_save_handle_error, parent);
    }

    g_object_unref (destination);

exit:
    g_list_foreach (list, (GFunc) g_object_unref, NULL);
    g_list_free (list);
}

static void
action_show_cb (GtkAction *action,
                EAttachmentView *view)
{
    EAttachment *attachment;
    GList *list;

    list = e_attachment_view_get_selected_attachments (view);
    g_return_if_fail (g_list_length (list) == 1);
    attachment = list->data;

    e_attachment_set_shown (attachment, TRUE);

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

static void
action_show_all_cb (GtkAction *action,
                    EAttachmentView *view)
{
    EAttachmentStore *store;
    GList *list, *iter;

    store = e_attachment_view_get_store (view);
    list = e_attachment_store_get_attachments (store);

    for (iter = list; iter != NULL; iter = iter->next) {
        EAttachment *attachment;

        attachment = E_ATTACHMENT (iter->data);
        e_attachment_set_shown (attachment, TRUE);
    }

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

static GtkActionEntry standard_entries[] = {

    { "cancel",
      "process-stop",
      N_("_Cancel"),
      NULL,
      NULL,  /* XXX Add a tooltip! */
      G_CALLBACK (action_cancel_cb) },

    { "open-with",
      NULL,
      N_("Open With Other Application..."),
      NULL,
      NULL,  /* XXX Add a tooltip! */
      G_CALLBACK (action_open_with_cb) },

    { "save-all",
      "document-save-as",
      N_("S_ave All"),
      NULL,
      NULL,  /* XXX Add a tooltip! */
      G_CALLBACK (action_save_all_cb) },

    { "save-as",
      "document-save-as",
      N_("Sa_ve As"),
      NULL,
      NULL,  /* XXX Add a tooltip! */
      G_CALLBACK (action_save_as_cb) },

    /* Alternate "save-all" label, for when
     * the attachment store has one row. */
    { "save-one",
      "document-save-as",
      N_("Save _As"),
      NULL,
      NULL,  /* XXX Add a tooltip! */
      G_CALLBACK (action_save_all_cb) },
};

static GtkActionEntry editable_entries[] = {

    { "add",
      "list-add",
      N_("A_dd Attachment..."),
      NULL,
      N_("Attach a file"),
      G_CALLBACK (action_add_cb) },

    { "properties",
      "document-properties",
      N_("_Properties"),
      NULL,
      NULL,  /* XXX Add a tooltip! */
      G_CALLBACK (action_properties_cb) },

    { "remove",
      "list-remove",
      N_("_Remove"),
      NULL,
      NULL,  /* XXX Add a tooltip! */
      G_CALLBACK (action_remove_cb) }
};

static GtkActionEntry inline_entries[] = {

    { "hide",
      NULL,
      N_("_Hide"),
      NULL,
      NULL,  /* XXX Add a tooltip! */
      G_CALLBACK (action_hide_cb) },

    { "hide-all",
      NULL,
      N_("Hid_e All"),
      NULL,
      NULL,  /* XXX Add a tooltip! */
      G_CALLBACK (action_hide_all_cb) },

    { "show",
      NULL,
      N_("_View Inline"),
      NULL,
      NULL,  /* XXX Add a tooltip! */
      G_CALLBACK (action_show_cb) },

    { "show-all",
      NULL,
      N_("Vie_w All Inline"),
      NULL,
      NULL,  /* XXX Add a tooltip! */
      G_CALLBACK (action_show_all_cb) }
};

static void
attachment_view_netscape_url (EAttachmentView *view,
                              GdkDragContext *drag_context,
                              gint x,
                              gint y,
                              GtkSelectionData *selection_data,
                              guint info,
                              guint time)
{
    static GdkAtom atom = GDK_NONE;
    EAttachmentStore *store;
    EAttachment *attachment;
    const gchar *data;
    gpointer parent;
    gchar *copied_data;
    gchar **strv;
    gint length;

    if (G_UNLIKELY (atom == GDK_NONE))
        atom = gdk_atom_intern_static_string ("_NETSCAPE_URL");

    if (gtk_selection_data_get_target (selection_data) != atom)
        return;

    g_signal_stop_emission_by_name (view, "drag-data-received");

    /* _NETSCAPE_URL is represented as "URI\nTITLE" */

    data = (const gchar *) gtk_selection_data_get_data (selection_data);
    length = gtk_selection_data_get_length (selection_data);

    copied_data = g_strndup (data, length);
    strv = g_strsplit (copied_data, "\n", 2);
    g_free (copied_data);

    store = e_attachment_view_get_store (view);

    parent = gtk_widget_get_toplevel (GTK_WIDGET (view));
    parent = gtk_widget_is_toplevel (parent) ? parent : NULL;

    attachment = e_attachment_new_for_uri (strv[0]);
    e_attachment_store_add_attachment (store, attachment);
    e_attachment_load_async (
        attachment, (GAsyncReadyCallback)
        e_attachment_load_handle_error, parent);
    g_object_unref (attachment);

    g_strfreev (strv);

    gtk_drag_finish (drag_context, TRUE, FALSE, time);
}

static void
attachment_view_text_calendar (EAttachmentView *view,
                               GdkDragContext *drag_context,
                               gint x,
                               gint y,
                               GtkSelectionData *selection_data,
                               guint info,
                               guint time)
{
    EAttachmentStore *store;
    EAttachment *attachment;
    CamelMimePart *mime_part;
    GdkAtom data_type;
    GdkAtom target;
    const gchar *data;
    gpointer parent;
    gchar *content_type;
    gint length;

    target = gtk_selection_data_get_target (selection_data);
    if (!e_targets_include_calendar (&target, 1))
        return;

    g_signal_stop_emission_by_name (view, "drag-data-received");

    data = (const gchar *) gtk_selection_data_get_data (selection_data);
    length = gtk_selection_data_get_length (selection_data);
    data_type = gtk_selection_data_get_data_type (selection_data);

    mime_part = camel_mime_part_new ();

    content_type = gdk_atom_name (data_type);
    camel_mime_part_set_content (mime_part, data, length, content_type);
    camel_mime_part_set_disposition (mime_part, "inline");
    g_free (content_type);

    store = e_attachment_view_get_store (view);

    parent = gtk_widget_get_toplevel (GTK_WIDGET (view));
    parent = gtk_widget_is_toplevel (parent) ? parent : NULL;

    attachment = e_attachment_new ();
    e_attachment_set_mime_part (attachment, mime_part);
    e_attachment_store_add_attachment (store, attachment);
    e_attachment_load_async (
        attachment, (GAsyncReadyCallback)
        e_attachment_load_handle_error, parent);
    g_object_unref (attachment);

    g_object_unref (mime_part);

    gtk_drag_finish (drag_context, TRUE, FALSE, time);
}

static void
attachment_view_text_x_vcard (EAttachmentView *view,
                              GdkDragContext *drag_context,
                              gint x,
                              gint y,
                              GtkSelectionData *selection_data,
                              guint info,
                              guint time)
{
    EAttachmentStore *store;
    EAttachment *attachment;
    CamelMimePart *mime_part;
    GdkAtom data_type;
    GdkAtom target;
    const gchar *data;
    gpointer parent;
    gchar *content_type;
    gint length;

    target = gtk_selection_data_get_target (selection_data);
    if (!e_targets_include_directory (&target, 1))
        return;

    g_signal_stop_emission_by_name (view, "drag-data-received");

    data = (const gchar *) gtk_selection_data_get_data (selection_data);
    length = gtk_selection_data_get_length (selection_data);
    data_type = gtk_selection_data_get_data_type (selection_data);

    mime_part = camel_mime_part_new ();

    content_type = gdk_atom_name (data_type);
    camel_mime_part_set_content (mime_part, data, length, content_type);
    camel_mime_part_set_disposition (mime_part, "inline");
    g_free (content_type);

    store = e_attachment_view_get_store (view);

    parent = gtk_widget_get_toplevel (GTK_WIDGET (view));
    parent = gtk_widget_is_toplevel (parent) ? parent : NULL;

    attachment = e_attachment_new ();
    e_attachment_set_mime_part (attachment, mime_part);
    e_attachment_store_add_attachment (store, attachment);
    e_attachment_load_async (
        attachment, (GAsyncReadyCallback)
        e_attachment_load_handle_error, parent);
    g_object_unref (attachment);

    g_object_unref (mime_part);

    gtk_drag_finish (drag_context, TRUE, FALSE, time);
}

static void
attachment_view_uris (EAttachmentView *view,
                      GdkDragContext *drag_context,
                      gint x,
                      gint y,
                      GtkSelectionData *selection_data,
                      guint info,
                      guint time)
{
    EAttachmentStore *store;
    gpointer parent;
    gchar **uris;
    gint ii;

    uris = gtk_selection_data_get_uris (selection_data);

    if (uris == NULL)
        return;

    g_signal_stop_emission_by_name (view, "drag-data-received");

    store = e_attachment_view_get_store (view);

    parent = gtk_widget_get_toplevel (GTK_WIDGET (view));
    parent = gtk_widget_is_toplevel (parent) ? parent : NULL;

    for (ii = 0; uris[ii] != NULL; ii++) {
        EAttachment *attachment;

        attachment = e_attachment_new_for_uri (uris[ii]);
        e_attachment_store_add_attachment (store, attachment);
        e_attachment_load_async (
            attachment, (GAsyncReadyCallback)
            e_attachment_load_handle_error, parent);
        g_object_unref (attachment);
    }

    g_strfreev (uris);

    gtk_drag_finish (drag_context, TRUE, FALSE, time);
}

static void
attachment_view_update_actions (EAttachmentView *view)
{
    EAttachmentViewPrivate *priv;
    EAttachment *attachment;
    EAttachmentStore *store;
    GtkActionGroup *action_group;
    GtkAction *action;
    GList *list, *iter;
    guint n_shown = 0;
    guint n_hidden = 0;
    guint n_selected;
    gboolean busy = FALSE;
    gboolean can_show = FALSE;
    gboolean shown = FALSE;
    gboolean visible;

    g_return_if_fail (E_IS_ATTACHMENT_VIEW (view));

    priv = e_attachment_view_get_private (view);

    store = e_attachment_view_get_store (view);
    list = e_attachment_store_get_attachments (store);

    for (iter = list; iter != NULL; iter = iter->next) {
        attachment = iter->data;

        if (!e_attachment_get_can_show (attachment))
            continue;

        if (e_attachment_get_shown (attachment))
            n_shown++;
        else
            n_hidden++;
    }

    g_list_foreach (list, (GFunc) g_object_unref, NULL);
    g_list_free (list);

    list = e_attachment_view_get_selected_attachments (view);
    n_selected = g_list_length (list);

    if (n_selected == 1) {
        attachment = g_object_ref (list->data);
        busy |= e_attachment_get_loading (attachment);
        busy |= e_attachment_get_saving (attachment);
        can_show = e_attachment_get_can_show (attachment);
        shown = e_attachment_get_shown (attachment);
    } else
        attachment = NULL;

    g_list_foreach (list, (GFunc) g_object_unref, NULL);
    g_list_free (list);

    action = e_attachment_view_get_action (view, "cancel");
    gtk_action_set_visible (action, busy);

    action = e_attachment_view_get_action (view, "hide");
    gtk_action_set_visible (action, can_show && shown);

    /* Show this action if there are multiple viewable
     * attachments, and at least one of them is shown. */
    visible = (n_shown + n_hidden > 1) && (n_shown > 0);
    action = e_attachment_view_get_action (view, "hide-all");
    gtk_action_set_visible (action, visible);

    action = e_attachment_view_get_action (view, "open-with");
    gtk_action_set_visible (action, !busy && n_selected == 1);

    action = e_attachment_view_get_action (view, "properties");
    gtk_action_set_visible (action, !busy && n_selected == 1);

    action = e_attachment_view_get_action (view, "remove");
    gtk_action_set_visible (action, !busy && n_selected > 0);

    action = e_attachment_view_get_action (view, "save-as");
    gtk_action_set_visible (action, !busy && n_selected > 0);

    action = e_attachment_view_get_action (view, "show");
    gtk_action_set_visible (action, can_show && !shown);

    /* Show this action if there are multiple viewable
     * attachments, and at least one of them is hidden. */
    visible = (n_shown + n_hidden > 1) && (n_hidden > 0);
    action = e_attachment_view_get_action (view, "show-all");
    gtk_action_set_visible (action, visible);

    /* Clear out the "openwith" action group. */
    gtk_ui_manager_remove_ui (priv->ui_manager, priv->merge_id);
    action_group = e_attachment_view_get_action_group (view, "openwith");
    e_action_group_remove_all_actions (action_group);
    gtk_ui_manager_ensure_update (priv->ui_manager);

    if (attachment == NULL || busy)
        return;

    list = e_attachment_list_apps (attachment);

    for (iter = list; iter != NULL; iter = iter->next) {
        GAppInfo *app_info = iter->data;
        GtkAction *action;
        GIcon *app_icon;
        const gchar *app_id;
        const gchar *app_name;
        gchar *action_tooltip;
        gchar *action_label;
        gchar *action_name;

        app_id = g_app_info_get_id (app_info);
        app_icon = g_app_info_get_icon (app_info);
        app_name = g_app_info_get_name (app_info);

        if (app_id == NULL)
            continue;

        /* Don't list 'Open With "Evolution"'. */
        if (g_str_equal (app_id, "evolution.desktop"))
            continue;

        action_name = g_strdup_printf ("open-with-%s", app_id);

        action_label = g_strdup_printf (
            _("Open With \"%s\""), app_name);

        action_tooltip = g_strdup_printf (
            _("Open this attachment in %s"), app_name);

        action = gtk_action_new (
            action_name, action_label, action_tooltip, NULL);

        gtk_action_set_gicon (action, app_icon);

        g_object_set_data_full (
            G_OBJECT (action),
            "app-info", g_object_ref (app_info),
            (GDestroyNotify) g_object_unref);

        g_object_set_data_full (
            G_OBJECT (action),
            "attachment", g_object_ref (attachment),
            (GDestroyNotify) g_object_unref);

        g_signal_connect (
            action, "activate",
            G_CALLBACK (action_open_with_app_info_cb), view);

        gtk_action_group_add_action (action_group, action);

        gtk_ui_manager_add_ui (
            priv->ui_manager, priv->merge_id,
            "/context/open-actions", action_name,
            action_name, GTK_UI_MANAGER_AUTO, FALSE);

        g_free (action_name);
        g_free (action_label);
        g_free (action_tooltip);
    }

    g_object_unref (attachment);
    g_list_foreach (list, (GFunc) g_object_unref, NULL);
    g_list_free (list);
}

static void
attachment_view_init_drag_dest (EAttachmentView *view)
{
    EAttachmentViewPrivate *priv;
    GtkTargetList *target_list;

    priv = e_attachment_view_get_private (view);

    target_list = gtk_target_list_new (
        target_table, G_N_ELEMENTS (target_table));

    gtk_target_list_add_uri_targets (target_list, 0);
    e_target_list_add_calendar_targets (target_list, 0);
    e_target_list_add_directory_targets (target_list, 0);

    priv->target_list = target_list;
    priv->drag_actions = GDK_ACTION_COPY;
}

static void
e_attachment_view_default_init (EAttachmentViewInterface *iface)
{
    iface->update_actions = attachment_view_update_actions;

    g_object_interface_install_property (
        iface,
        g_param_spec_boolean (
            "dragging",
            "Dragging",
            NULL,
            FALSE,
            G_PARAM_READWRITE));

    g_object_interface_install_property (
        iface,
        g_param_spec_boolean (
            "editable",
            "Editable",
            NULL,
            TRUE,
            G_PARAM_READWRITE |
            G_PARAM_CONSTRUCT));

    signals[UPDATE_ACTIONS] = g_signal_new (
        "update-actions",
        G_TYPE_FROM_INTERFACE (iface),
        G_SIGNAL_RUN_FIRST | G_SIGNAL_ACTION,
        G_STRUCT_OFFSET (EAttachmentViewInterface, update_actions),
        NULL, NULL,
        g_cclosure_marshal_VOID__VOID,
        G_TYPE_NONE, 0);

    /* Register known handler types. */
    g_type_ensure (E_TYPE_ATTACHMENT_HANDLER_IMAGE);
}

void
e_attachment_view_init (EAttachmentView *view)
{
    EAttachmentViewPrivate *priv;
    GtkUIManager *ui_manager;
    GtkActionGroup *action_group;
    GError *error = NULL;

    priv = e_attachment_view_get_private (view);

    ui_manager = gtk_ui_manager_new ();
    priv->merge_id = gtk_ui_manager_new_merge_id (ui_manager);
    priv->ui_manager = ui_manager;

    action_group = e_attachment_view_add_action_group (view, "standard");

    gtk_action_group_add_actions (
        action_group, standard_entries,
        G_N_ELEMENTS (standard_entries), view);

    action_group = e_attachment_view_add_action_group (view, "editable");

    g_object_bind_property (
        view, "editable",
        action_group, "visible",
        G_BINDING_BIDIRECTIONAL |
        G_BINDING_SYNC_CREATE);
    gtk_action_group_add_actions (
        action_group, editable_entries,
        G_N_ELEMENTS (editable_entries), view);

    action_group = e_attachment_view_add_action_group (view, "inline");

    gtk_action_group_add_actions (
        action_group, inline_entries,
        G_N_ELEMENTS (inline_entries), view);
    gtk_action_group_set_visible (action_group, FALSE);

    e_attachment_view_add_action_group (view, "openwith");

    /* Because we are loading from a hard-coded string, there is
     * no chance of I/O errors.  Failure here implies a malformed
     * UI definition.  Full stop. */
    gtk_ui_manager_add_ui_from_string (ui_manager, ui, -1, &error);
    if (error != NULL)
        g_error ("%s", error->message);

    attachment_view_init_drag_dest (view);

    e_attachment_view_drag_source_set (view);

    /* Connect built-in drag and drop handlers. */

    g_signal_connect (
        view, "drag-data-received",
        G_CALLBACK (attachment_view_netscape_url), NULL);

    g_signal_connect (
        view, "drag-data-received",
        G_CALLBACK (attachment_view_text_calendar), NULL);

    g_signal_connect (
        view, "drag-data-received",
        G_CALLBACK (attachment_view_text_x_vcard), NULL);

    g_signal_connect (
        view, "drag-data-received",
        G_CALLBACK (attachment_view_uris), NULL);
}

void
e_attachment_view_dispose (EAttachmentView *view)
{
    EAttachmentViewPrivate *priv;

    priv = e_attachment_view_get_private (view);

    if (priv->target_list != NULL) {
        gtk_target_list_unref (priv->target_list);
        priv->target_list = NULL;
    }

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

void
e_attachment_view_finalize (EAttachmentView *view)
{
    EAttachmentViewPrivate *priv;

    priv = e_attachment_view_get_private (view);

    g_list_foreach (priv->event_list, (GFunc) gdk_event_free, NULL);
    g_list_free (priv->event_list);

    g_list_foreach (priv->selected, (GFunc) g_object_unref, NULL);
    g_list_free (priv->selected);
}

EAttachmentViewPrivate *
e_attachment_view_get_private (EAttachmentView *view)
{
    EAttachmentViewInterface *iface;

    g_return_val_if_fail (E_IS_ATTACHMENT_VIEW (view), NULL);

    iface = E_ATTACHMENT_VIEW_GET_INTERFACE (view);
    g_return_val_if_fail (iface->get_private != NULL, NULL);

    return iface->get_private (view);
}

EAttachmentStore *
e_attachment_view_get_store (EAttachmentView *view)
{
    EAttachmentViewInterface *iface;

    g_return_val_if_fail (E_IS_ATTACHMENT_VIEW (view), NULL);

    iface = E_ATTACHMENT_VIEW_GET_INTERFACE (view);
    g_return_val_if_fail (iface->get_store != NULL, NULL);

    return iface->get_store (view);
}

gboolean
e_attachment_view_get_editable (EAttachmentView *view)
{
    EAttachmentViewPrivate *priv;

    g_return_val_if_fail (E_IS_ATTACHMENT_VIEW (view), FALSE);

    priv = e_attachment_view_get_private (view);

    return priv->editable;
}

void
e_attachment_view_set_editable (EAttachmentView *view,
                                gboolean editable)
{
    EAttachmentViewPrivate *priv;

    g_return_if_fail (E_IS_ATTACHMENT_VIEW (view));

    priv = e_attachment_view_get_private (view);

    priv->editable = editable;

    if (editable)
        e_attachment_view_drag_dest_set (view);
    else
        e_attachment_view_drag_dest_unset (view);

    g_object_notify (G_OBJECT (view), "editable");
}

gboolean
e_attachment_view_get_dragging (EAttachmentView *view)
{
    EAttachmentViewPrivate *priv;

    g_return_val_if_fail (E_IS_ATTACHMENT_VIEW (view), FALSE);

    priv = e_attachment_view_get_private (view);

    return priv->dragging;
}

void
e_attachment_view_set_dragging (EAttachmentView *view,
                                gboolean dragging)
{
    EAttachmentViewPrivate *priv;

    g_return_if_fail (E_IS_ATTACHMENT_VIEW (view));

    priv = e_attachment_view_get_private (view);

    priv->dragging = dragging;

    g_object_notify (G_OBJECT (view), "dragging");
}

GtkTargetList *
e_attachment_view_get_target_list (EAttachmentView *view)
{
    EAttachmentViewPrivate *priv;

    g_return_val_if_fail (E_IS_ATTACHMENT_VIEW (view), NULL);

    priv = e_attachment_view_get_private (view);

    return priv->target_list;
}

GdkDragAction
e_attachment_view_get_drag_actions (EAttachmentView *view)
{
    EAttachmentViewPrivate *priv;

    g_return_val_if_fail (E_IS_ATTACHMENT_VIEW (view), 0);

    priv = e_attachment_view_get_private (view);

    return priv->drag_actions;
}

void
e_attachment_view_add_drag_actions (EAttachmentView *view,
                                    GdkDragAction drag_actions)
{
    EAttachmentViewPrivate *priv;

    g_return_if_fail (E_IS_ATTACHMENT_VIEW (view));

    priv = e_attachment_view_get_private (view);

    priv->drag_actions |= drag_actions;
}

GList *
e_attachment_view_get_selected_attachments (EAttachmentView *view)
{
    EAttachmentStore *store;
    GtkTreeModel *model;
    GList *list, *item;
    gint column_id;

    g_return_val_if_fail (E_IS_ATTACHMENT_VIEW (view), NULL);

    column_id = E_ATTACHMENT_STORE_COLUMN_ATTACHMENT;
    list = e_attachment_view_get_selected_paths (view);
    store = e_attachment_view_get_store (view);
    model = GTK_TREE_MODEL (store);

    /* Convert the GtkTreePaths to EAttachments. */
    for (item = list; item != NULL; item = item->next) {
        EAttachment *attachment;
        GtkTreePath *path;
        GtkTreeIter iter;

        path = item->data;

        gtk_tree_model_get_iter (model, &iter, path);
        gtk_tree_model_get (model, &iter, column_id, &attachment, -1);
        gtk_tree_path_free (path);

        item->data = attachment;
    }

    return list;
}

void
e_attachment_view_open_path (EAttachmentView *view,
                             GtkTreePath *path,
                             GAppInfo *app_info)
{
    EAttachmentStore *store;
    EAttachment *attachment;
    GtkTreeModel *model;
    GtkTreeIter iter;
    gboolean iter_valid;
    gpointer parent;
    gint column_id;

    g_return_if_fail (E_IS_ATTACHMENT_VIEW (view));
    g_return_if_fail (path != NULL);

    column_id = E_ATTACHMENT_STORE_COLUMN_ATTACHMENT;
    store = e_attachment_view_get_store (view);
    model = GTK_TREE_MODEL (store);

    iter_valid = gtk_tree_model_get_iter (model, &iter, path);
    g_return_if_fail (iter_valid);

    gtk_tree_model_get (model, &iter, column_id, &attachment, -1);

    parent = gtk_widget_get_toplevel (GTK_WIDGET (view));
    parent = gtk_widget_is_toplevel (parent) ? parent : NULL;

    e_attachment_open_async (
        attachment, app_info, (GAsyncReadyCallback)
        e_attachment_open_handle_error, parent);

    g_object_unref (attachment);
}

void
e_attachment_view_remove_selected (EAttachmentView *view,
                                   gboolean select_next)
{
    EAttachmentStore *store;
    GtkTreeModel *model;
    GList *list, *item;
    gint column_id;

    g_return_if_fail (E_IS_ATTACHMENT_VIEW (view));

    column_id = E_ATTACHMENT_STORE_COLUMN_ATTACHMENT;
    list = e_attachment_view_get_selected_paths (view);
    store = e_attachment_view_get_store (view);
    model = GTK_TREE_MODEL (store);

    /* Remove attachments in reverse order to avoid invalidating
     * tree paths as we iterate over the list.  Note, the list is
     * probably already sorted but we sort again just to be safe. */
    list = g_list_reverse (g_list_sort (
        list, (GCompareFunc) gtk_tree_path_compare));

    for (item = list; item != NULL; item = item->next) {
        EAttachment *attachment;
        GtkTreePath *path = item->data;
        GtkTreeIter iter;

        gtk_tree_model_get_iter (model, &iter, path);
        gtk_tree_model_get (model, &iter, column_id, &attachment, -1);
        e_attachment_store_remove_attachment (store, attachment);
        g_object_unref (attachment);
    }

    /* If we only removed one attachment, try to select another. */
    if (select_next && g_list_length (list) == 1) {
        GtkTreePath *path = list->data;

        e_attachment_view_select_path (view, path);
        if (!e_attachment_view_path_is_selected (view, path))
            if (gtk_tree_path_prev (path))
                e_attachment_view_select_path (view, path);
    }

    g_list_foreach (list, (GFunc) gtk_tree_path_free, NULL);
    g_list_free (list);
}

gboolean
e_attachment_view_button_press_event (EAttachmentView *view,
                                      GdkEventButton *event)
{
    EAttachmentViewPrivate *priv;
    GtkTreePath *path;
    gboolean editable;
    gboolean handled = FALSE;
    gboolean path_is_selected = FALSE;

    g_return_val_if_fail (E_IS_ATTACHMENT_VIEW (view), FALSE);
    g_return_val_if_fail (event != NULL, FALSE);

    priv = e_attachment_view_get_private (view);

    if (g_list_find (priv->event_list, event) != NULL)
        return FALSE;

    if (priv->event_list != NULL) {
        /* Save the event to be propagated in order. */
        priv->event_list = g_list_append (
            priv->event_list,
            gdk_event_copy ((GdkEvent *) event));
        return TRUE;
    }

    editable = e_attachment_view_get_editable (view);
    path = e_attachment_view_get_path_at_pos (view, event->x, event->y);
    path_is_selected = e_attachment_view_path_is_selected (view, path);

    if (event->button == 1 && event->type == GDK_BUTTON_PRESS) {
        GList *list, *iter;
        gboolean busy = FALSE;

        list = e_attachment_view_get_selected_attachments (view);

        for (iter = list; iter != NULL; iter = iter->next) {
            EAttachment *attachment = iter->data;
            busy |= e_attachment_get_loading (attachment);
            busy |= e_attachment_get_saving (attachment);
        }

        /* Prepare for dragging if the clicked item is selected
         * and none of the selected items are loading or saving. */
        if (path_is_selected && !busy) {
            priv->start_x = event->x;
            priv->start_y = event->y;
            priv->event_list = g_list_append (
                priv->event_list,
                gdk_event_copy ((GdkEvent *) event));
            handled = TRUE;
        }

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

    if (event->button == 3 && event->type == GDK_BUTTON_PRESS) {
        /* If the user clicked on a selected item, retain the
         * current selection.  If the user clicked on an unselected
         * item, select the clicked item only.  If the user did not
         * click on an item, clear the current selection. */
        if (path == NULL)
            e_attachment_view_unselect_all (view);
        else if (!path_is_selected) {
            e_attachment_view_unselect_all (view);
            e_attachment_view_select_path (view, path);
        }

        /* Non-editable attachment views should only show a
         * popup menu when right-clicking on an attachment,
         * but editable views can show the menu any time. */
        if (path != NULL || editable) {
            e_attachment_view_show_popup_menu (
                view, event, NULL, NULL);
            handled = TRUE;
        }
    }

    if (path != NULL)
        gtk_tree_path_free (path);

    return handled;
}

gboolean
e_attachment_view_button_release_event (EAttachmentView *view,
                                        GdkEventButton *event)
{
    EAttachmentViewPrivate *priv;
    GtkWidget *widget = GTK_WIDGET (view);
    GList *iter;

    g_return_val_if_fail (E_IS_ATTACHMENT_VIEW (view), FALSE);
    g_return_val_if_fail (event != NULL, FALSE);

    priv = e_attachment_view_get_private (view);

    for (iter = priv->event_list; iter != NULL; iter = iter->next) {
        GdkEvent *event = iter->data;

        gtk_propagate_event (widget, event);
        gdk_event_free (event);
    }

    g_list_free (priv->event_list);
    priv->event_list = NULL;

    return FALSE;
}

gboolean
e_attachment_view_motion_notify_event (EAttachmentView *view,
                                       GdkEventMotion *event)
{
    EAttachmentViewPrivate *priv;
    GtkWidget *widget = GTK_WIDGET (view);
    GtkTargetList *targets;

    g_return_val_if_fail (E_IS_ATTACHMENT_VIEW (view), FALSE);
    g_return_val_if_fail (event != NULL, FALSE);

    priv = e_attachment_view_get_private (view);

    if (priv->event_list == NULL)
        return FALSE;

    if (!gtk_drag_check_threshold (
        widget, priv->start_x, priv->start_y, event->x, event->y))
        return TRUE;

    g_list_foreach (priv->event_list, (GFunc) gdk_event_free, NULL);
    g_list_free (priv->event_list);
    priv->event_list = NULL;

    targets = gtk_drag_source_get_target_list (widget);

    gtk_drag_begin (
        widget, targets, GDK_ACTION_COPY, 1, (GdkEvent *) event);

    return TRUE;
}

gboolean
e_attachment_view_key_press_event (EAttachmentView *view,
                                   GdkEventKey *event)
{
    gboolean editable;

    g_return_val_if_fail (E_IS_ATTACHMENT_VIEW (view), FALSE);
    g_return_val_if_fail (event != NULL, FALSE);

    editable = e_attachment_view_get_editable (view);

    if (event->keyval == GDK_KEY_Delete && editable) {
        e_attachment_view_remove_selected (view, TRUE);
        return TRUE;
    }

    return FALSE;
}

GtkTreePath *
e_attachment_view_get_path_at_pos (EAttachmentView *view,
                                   gint x,
                                   gint y)
{
    EAttachmentViewInterface *iface;

    g_return_val_if_fail (E_IS_ATTACHMENT_VIEW (view), NULL);

    iface = E_ATTACHMENT_VIEW_GET_INTERFACE (view);
    g_return_val_if_fail (iface->get_path_at_pos != NULL, NULL);

    return iface->get_path_at_pos (view, x, y);
}

GList *
e_attachment_view_get_selected_paths (EAttachmentView *view)
{
    EAttachmentViewInterface *iface;

    g_return_val_if_fail (E_IS_ATTACHMENT_VIEW (view), NULL);

    iface = E_ATTACHMENT_VIEW_GET_INTERFACE (view);
    g_return_val_if_fail (iface->get_selected_paths != NULL, NULL);

    return iface->get_selected_paths (view);
}

gboolean
e_attachment_view_path_is_selected (EAttachmentView *view,
                                    GtkTreePath *path)
{
    EAttachmentViewInterface *iface;

    g_return_val_if_fail (E_IS_ATTACHMENT_VIEW (view), FALSE);

    /* Handle NULL paths gracefully. */
    if (path == NULL)
        return FALSE;

    iface = E_ATTACHMENT_VIEW_GET_INTERFACE (view);
    g_return_val_if_fail (iface->path_is_selected != NULL, FALSE);

    return iface->path_is_selected (view, path);
}

void
e_attachment_view_select_path (EAttachmentView *view,
                               GtkTreePath *path)
{
    EAttachmentViewInterface *iface;

    g_return_if_fail (E_IS_ATTACHMENT_VIEW (view));
    g_return_if_fail (path != NULL);

    iface = E_ATTACHMENT_VIEW_GET_INTERFACE (view);
    g_return_if_fail (iface->select_path != NULL);

    iface->select_path (view, path);
}

void
e_attachment_view_unselect_path (EAttachmentView *view,
                                 GtkTreePath *path)
{
    EAttachmentViewInterface *iface;

    g_return_if_fail (E_IS_ATTACHMENT_VIEW (view));
    g_return_if_fail (path != NULL);

    iface = E_ATTACHMENT_VIEW_GET_INTERFACE (view);
    g_return_if_fail (iface->unselect_path != NULL);

    iface->unselect_path (view, path);
}

void
e_attachment_view_select_all (EAttachmentView *view)
{
    EAttachmentViewInterface *iface;

    g_return_if_fail (E_IS_ATTACHMENT_VIEW (view));

    iface = E_ATTACHMENT_VIEW_GET_INTERFACE (view);
    g_return_if_fail (iface->select_all != NULL);

    iface->select_all (view);
}

void
e_attachment_view_unselect_all (EAttachmentView *view)
{
    EAttachmentViewInterface *iface;

    g_return_if_fail (E_IS_ATTACHMENT_VIEW (view));

    iface = E_ATTACHMENT_VIEW_GET_INTERFACE (view);
    g_return_if_fail (iface->unselect_all != NULL);

    iface->unselect_all (view);
}

void
e_attachment_view_sync_selection (EAttachmentView *view,
                                  EAttachmentView *target)
{
    GList *list, *iter;

    g_return_if_fail (E_IS_ATTACHMENT_VIEW (view));
    g_return_if_fail (E_IS_ATTACHMENT_VIEW (target));

    list = e_attachment_view_get_selected_paths (view);
    e_attachment_view_unselect_all (target);

    for (iter = list; iter != NULL; iter = iter->next)
        e_attachment_view_select_path (target, iter->data);

    g_list_foreach (list, (GFunc) gtk_tree_path_free, NULL);
    g_list_free (list);
}

void
e_attachment_view_drag_source_set (EAttachmentView *view)
{
    EAttachmentViewInterface *iface;
    GtkTargetEntry *targets;
    GtkTargetList *list;
    gint n_targets;

    g_return_if_fail (E_IS_ATTACHMENT_VIEW (view));

    iface = E_ATTACHMENT_VIEW_GET_INTERFACE (view);
    if (iface->drag_source_set == NULL)
        return;

    list = gtk_target_list_new (NULL, 0);
    gtk_target_list_add_uri_targets (list, 0);
    targets = gtk_target_table_new_from_list (list, &n_targets);

    iface->drag_source_set (
        view, GDK_BUTTON1_MASK,
        targets, n_targets, GDK_ACTION_COPY);

    gtk_target_table_free (targets, n_targets);
    gtk_target_list_unref (list);
}

void
e_attachment_view_drag_source_unset (EAttachmentView *view)
{
    EAttachmentViewInterface *iface;

    g_return_if_fail (E_IS_ATTACHMENT_VIEW (view));

    iface = E_ATTACHMENT_VIEW_GET_INTERFACE (view);
    if (iface->drag_source_unset == NULL)
        return;

    iface->drag_source_unset (view);
}

void
e_attachment_view_drag_begin (EAttachmentView *view,
                              GdkDragContext *context)
{
    EAttachmentViewPrivate *priv;
    guint n_selected;

    g_return_if_fail (E_IS_ATTACHMENT_VIEW (view));
    g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));

    priv = e_attachment_view_get_private (view);

    e_attachment_view_set_dragging (view, TRUE);

    g_warn_if_fail (priv->selected == NULL);
    priv->selected = e_attachment_view_get_selected_attachments (view);
    n_selected = g_list_length (priv->selected);

    if (n_selected == 1) {
        EAttachment *attachment;
        GtkIconTheme *icon_theme;
        GtkIconInfo *icon_info;
        GIcon *icon;
        gint width, height;

        attachment = E_ATTACHMENT (priv->selected->data);
        icon = e_attachment_ref_icon (attachment);
        g_return_if_fail (icon != NULL);

        icon_theme = gtk_icon_theme_get_default ();
        gtk_icon_size_lookup (GTK_ICON_SIZE_DND, &width, &height);

        icon_info = gtk_icon_theme_lookup_by_gicon (
            icon_theme, icon, MIN (width, height),
            GTK_ICON_LOOKUP_USE_BUILTIN);

        if (icon_info != NULL) {
            GdkPixbuf *pixbuf;
            GError *error = NULL;

            pixbuf = gtk_icon_info_load_icon (icon_info, &error);

            if (pixbuf != NULL) {
                gtk_drag_set_icon_pixbuf (
                    context, pixbuf, 0, 0);
                g_object_unref (pixbuf);
            } else if (error != NULL) {
                g_warning ("%s", error->message);
                g_error_free (error);
            }

            gtk_icon_info_free (icon_info);
        }

        g_object_unref (icon);
    }
}

void
e_attachment_view_drag_end (EAttachmentView *view,
                            GdkDragContext *context)
{
    EAttachmentViewPrivate *priv;

    g_return_if_fail (E_IS_ATTACHMENT_VIEW (view));
    g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));

    priv = e_attachment_view_get_private (view);

    e_attachment_view_set_dragging (view, FALSE);

    g_list_foreach (priv->selected, (GFunc) g_object_unref, NULL);
    g_list_free (priv->selected);
    priv->selected = NULL;
}

static void
attachment_view_got_uris_cb (EAttachmentStore *store,
                             GAsyncResult *result,
                             gpointer user_data)
{
    struct {
        gchar **uris;
        gboolean done;
    } *status = user_data;

    /* XXX Since this is a best-effort function,
     *     should we care about errors? */
    status->uris = e_attachment_store_get_uris_finish (
        store, result, NULL);

    status->done = TRUE;
}

void
e_attachment_view_drag_data_get (EAttachmentView *view,
                                 GdkDragContext *context,
                                 GtkSelectionData *selection,
                                 guint info,
                                 guint time)
{
    EAttachmentViewPrivate *priv;
    EAttachmentStore *store;

    struct {
        gchar **uris;
        gboolean done;
    } status;

    g_return_if_fail (E_IS_ATTACHMENT_VIEW (view));
    g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
    g_return_if_fail (selection != NULL);

    status.uris = NULL;
    status.done = FALSE;

    priv = e_attachment_view_get_private (view);
    store = e_attachment_view_get_store (view);

    if (priv->selected == NULL)
        return;

    e_attachment_store_get_uris_async (
        store, priv->selected, (GAsyncReadyCallback)
        attachment_view_got_uris_cb, &status);

    /* We can't return until we have results, so crank
     * the main loop until the callback gets triggered. */
    while (!status.done)
        if (gtk_main_iteration ())
            break;

    if (status.uris != NULL)
        gtk_selection_data_set_uris (selection, status.uris);

    g_strfreev (status.uris);
}

void
e_attachment_view_drag_dest_set (EAttachmentView *view)
{
    EAttachmentViewPrivate *priv;
    EAttachmentViewInterface *iface;
    GtkTargetEntry *targets;
    gint n_targets;

    g_return_if_fail (E_IS_ATTACHMENT_VIEW (view));

    iface = E_ATTACHMENT_VIEW_GET_INTERFACE (view);
    if (iface->drag_dest_set == NULL)
        return;

    priv = e_attachment_view_get_private (view);

    targets = gtk_target_table_new_from_list (
        priv->target_list, &n_targets);

    iface->drag_dest_set (
        view, targets, n_targets, priv->drag_actions);

    gtk_target_table_free (targets, n_targets);
}

void
e_attachment_view_drag_dest_unset (EAttachmentView *view)
{
    EAttachmentViewInterface *iface;

    g_return_if_fail (E_IS_ATTACHMENT_VIEW (view));

    iface = E_ATTACHMENT_VIEW_GET_INTERFACE (view);
    if (iface->drag_dest_unset == NULL)
        return;

    iface->drag_dest_unset (view);
}

gboolean
e_attachment_view_drag_motion (EAttachmentView *view,
                               GdkDragContext *context,
                               gint x,
                               gint y,
                               guint time)
{
    EAttachmentViewPrivate *priv;
    GdkDragAction actions;
    GdkDragAction chosen_action;

    g_return_val_if_fail (E_IS_ATTACHMENT_VIEW (view), FALSE);
    g_return_val_if_fail (GDK_IS_DRAG_CONTEXT (context), FALSE);

    priv = e_attachment_view_get_private (view);

    /* Disallow drops if we're not editable. */
    if (!e_attachment_view_get_editable (view))
        return FALSE;

    /* Disallow drops if we initiated the drag.
     * This helps prevent duplicate attachments. */
    if (e_attachment_view_get_dragging (view))
        return FALSE;

    actions = gdk_drag_context_get_actions (context);
    actions &= priv->drag_actions;
    chosen_action = gdk_drag_context_get_suggested_action (context);

    if (chosen_action == GDK_ACTION_ASK) {
        GdkDragAction mask;

        mask = GDK_ACTION_COPY | GDK_ACTION_MOVE;
        if ((actions & mask) != mask)
            chosen_action = GDK_ACTION_COPY;
    }

    gdk_drag_status (context, chosen_action, time);

    return (chosen_action != 0);
}

gboolean
e_attachment_view_drag_drop (EAttachmentView *view,
                             GdkDragContext *context,
                             gint x,
                             gint y,
                             guint time)
{
    g_return_val_if_fail (E_IS_ATTACHMENT_VIEW (view), FALSE);
    g_return_val_if_fail (GDK_IS_DRAG_CONTEXT (context), FALSE);

    /* Disallow drops if we initiated the drag.
     * This helps prevent duplicate attachments. */
    return !e_attachment_view_get_dragging (view);
}

void
e_attachment_view_drag_data_received (EAttachmentView *view,
                                      GdkDragContext *drag_context,
                                      gint x,
                                      gint y,
                                      GtkSelectionData *selection_data,
                                      guint info,
                                      guint time)
{
    GdkAtom atom;
    gchar *name;

    g_return_if_fail (E_IS_ATTACHMENT_VIEW (view));
    g_return_if_fail (GDK_IS_DRAG_CONTEXT (drag_context));

    /* Drop handlers are supposed to stop further emission of the
     * "drag-data-received" signal if they can handle the data.  If
     * we get this far it means none of the handlers were successful,
     * so report the drop as failed. */

    atom = gtk_selection_data_get_target (selection_data);

    name = gdk_atom_name (atom);
    g_warning ("Unknown selection target: %s", name);
    g_free (name);

    gtk_drag_finish (drag_context, FALSE, FALSE, time);
}

GtkAction *
e_attachment_view_get_action (EAttachmentView *view,
                              const gchar *action_name)
{
    GtkUIManager *ui_manager;

    g_return_val_if_fail (E_IS_ATTACHMENT_VIEW (view), NULL);
    g_return_val_if_fail (action_name != NULL, NULL);

    ui_manager = e_attachment_view_get_ui_manager (view);

    return e_lookup_action (ui_manager, action_name);
}

GtkActionGroup *
e_attachment_view_add_action_group (EAttachmentView *view,
                                    const gchar *group_name)
{
    GtkActionGroup *action_group;
    GtkUIManager *ui_manager;
    const gchar *domain;

    g_return_val_if_fail (E_IS_ATTACHMENT_VIEW (view), NULL);
    g_return_val_if_fail (group_name != NULL, NULL);

    ui_manager = e_attachment_view_get_ui_manager (view);
    domain = GETTEXT_PACKAGE;

    action_group = gtk_action_group_new (group_name);
    gtk_action_group_set_translation_domain (action_group, domain);
    gtk_ui_manager_insert_action_group (ui_manager, action_group, 0);
    g_object_unref (action_group);

    return action_group;
}

GtkActionGroup *
e_attachment_view_get_action_group (EAttachmentView *view,
                                    const gchar *group_name)
{
    GtkUIManager *ui_manager;

    g_return_val_if_fail (E_IS_ATTACHMENT_VIEW (view), NULL);
    g_return_val_if_fail (group_name != NULL, NULL);

    ui_manager = e_attachment_view_get_ui_manager (view);

    return e_lookup_action_group (ui_manager, group_name);
}

GtkWidget *
e_attachment_view_get_popup_menu (EAttachmentView *view)
{
    GtkUIManager *ui_manager;
    GtkWidget *menu;

    g_return_val_if_fail (E_IS_ATTACHMENT_VIEW (view), NULL);

    ui_manager = e_attachment_view_get_ui_manager (view);
    menu = gtk_ui_manager_get_widget (ui_manager, "/context");
    g_return_val_if_fail (GTK_IS_MENU (menu), NULL);

    return menu;
}

GtkUIManager *
e_attachment_view_get_ui_manager (EAttachmentView *view)
{
    EAttachmentViewPrivate *priv;

    g_return_val_if_fail (E_IS_ATTACHMENT_VIEW (view), NULL);

    priv = e_attachment_view_get_private (view);

    return priv->ui_manager;
}

void
e_attachment_view_show_popup_menu (EAttachmentView *view,
                                   GdkEventButton *event,
                                   GtkMenuPositionFunc func,
                                   gpointer user_data)
{
    GtkWidget *menu;

    g_return_if_fail (E_IS_ATTACHMENT_VIEW (view));

    e_attachment_view_update_actions (view);

    menu = e_attachment_view_get_popup_menu (view);

    if (event != NULL)
        gtk_menu_popup (
            GTK_MENU (menu), NULL, NULL, func,
            user_data, event->button, event->time);
    else
        gtk_menu_popup (
            GTK_MENU (menu), NULL, NULL, func,
            user_data, 0, gtk_get_current_event_time ());
}

void
e_attachment_view_update_actions (EAttachmentView *view)
{
    g_return_if_fail (E_IS_ATTACHMENT_VIEW (view));

    g_signal_emit (view, signals[UPDATE_ACTIONS], 0);
}