path: root/e-util/e-alert-sink.c

/*
 * e-alert-sink.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/>
 *
 */

/**
 * SECTION: e-alert-sink
 * @short_description: an interface to handle alerts
 * @include: e-util/e-alert-sink.h
 *
 * A widget that implements #EAlertSink means it can handle #EAlerts,
 * usually by displaying them to the user.
 **/

#include "e-alert-sink.h"

#include "e-alert-dialog.h"

G_DEFINE_INTERFACE (
    EAlertSink,
    e_alert_sink,
    GTK_TYPE_WIDGET)

static void
alert_sink_fallback (GtkWidget *widget,
                     EAlert *alert)
{
    GtkWidget *dialog;
    gpointer parent;

    parent = gtk_widget_get_toplevel (widget);
    parent = gtk_widget_is_toplevel (parent) ? parent : NULL;

    dialog = e_alert_dialog_new (parent, alert);
    gtk_dialog_run (GTK_DIALOG (dialog));
    gtk_widget_destroy (dialog);
}

static void
alert_sink_submit_alert (EAlertSink *alert_sink,
                         EAlert *alert)
{
    /* This is just a lame fallback handler.  Implementors
     * are strongly encouraged to override this method. */
    alert_sink_fallback (GTK_WIDGET (alert_sink), alert);
}

static void
e_alert_sink_default_init (EAlertSinkInterface *interface)
{
    interface->submit_alert = alert_sink_submit_alert;
}

/**
 * e_alert_sink_submit_alert:
 * @widget: a #GtkWidget, either itself an #EAlertSink or a child of one
 * @alert: an #EAlert
 *
 * This function is a place to pass #EAlert objects.  Beyond that it has no
 * well-defined behavior.  It's up to the widget implementing the #EAlertSink
 * interface to decide what to do with them.
 *
 * Either @widget or one of its ancestors must implement #EAlertSink.
 *
 * The default behavior is to display the @alert in a dialog.
 **/
void
e_alert_sink_submit_alert (GtkWidget *widget,
                           EAlert *alert)
{
    GtkWidget *ancestor;

    g_return_if_fail (GTK_IS_WIDGET (widget));
    g_return_if_fail (E_IS_ALERT (alert));

    ancestor = gtk_widget_get_ancestor (widget, E_TYPE_ALERT_SINK);

    if (E_IS_ALERT_SINK (ancestor)) {
        EAlertSinkInterface *interface;

        interface = E_ALERT_SINK_GET_INTERFACE (ancestor);
        g_return_if_fail (interface->submit_alert != NULL);

        interface->submit_alert (E_ALERT_SINK (ancestor), alert);
    } else
        alert_sink_fallback (widget, alert);
}