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

/*
 * e-alert-bar.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/>
 *
 */

#include "e-alert-bar.h"

#include <config.h>
#include <glib/gi18n-lib.h>

#define E_ALERT_BAR_GET_PRIVATE(obj) \
    (G_TYPE_INSTANCE_GET_PRIVATE \
    ((obj), E_TYPE_ALERT_BAR, EAlertBarPrivate))

#define E_ALERT_BAR_GET_PRIVATE(obj) \
    (G_TYPE_INSTANCE_GET_PRIVATE \
    ((obj), E_TYPE_ALERT_BAR, EAlertBarPrivate))

/* GTK_ICON_SIZE_DIALOG is a tad too big. */
#define ICON_SIZE GTK_ICON_SIZE_DND

/* Dismiss warnings automatically after 5 minutes. */
#define WARNING_TIMEOUT_SECONDS (5 * 60)

struct _EAlertBarPrivate {
    GQueue alerts;
    GtkWidget *image;       /* not referenced */
    GtkWidget *primary_label;   /* not referenced */
    GtkWidget *secondary_label; /* not referenced */
};

G_DEFINE_TYPE (
    EAlertBar,
    e_alert_bar,
    GTK_TYPE_INFO_BAR)

static void
alert_bar_response_close (EAlert *alert)
{
    e_alert_response (alert, GTK_RESPONSE_CLOSE);
}

static void
alert_bar_show_alert (EAlertBar *alert_bar)
{
    GtkImage *image;
    GtkInfoBar *info_bar;
    GtkWidget *action_area;
    GtkWidget *widget;
    EAlert *alert;
    GList *actions;
    GList *children;
    GtkMessageType message_type;
    const gchar *primary_text;
    const gchar *secondary_text;
    const gchar *stock_id;
    gboolean have_primary_text;
    gboolean have_secondary_text;
    gboolean visible;
    gint response_id;
    gchar *markup;

    info_bar = GTK_INFO_BAR (alert_bar);
    action_area = gtk_info_bar_get_action_area (info_bar);

    alert = g_queue_peek_head (&alert_bar->priv->alerts);
    g_return_if_fail (E_IS_ALERT (alert));

    /* Remove all buttons from the previous alert. */
    children = gtk_container_get_children (GTK_CONTAINER (action_area));
    while (children != NULL) {
        GtkWidget *child = GTK_WIDGET (children->data);
        gtk_container_remove (GTK_CONTAINER (action_area), child);
        children = g_list_delete_link (children, children);
    }

    /* Add alert-specific buttons. */
    actions = e_alert_peek_actions (alert);
    while (actions != NULL) {
        /* These actions are already wired to trigger an
         * EAlert::response signal when activated, which
         * will in turn call gtk_info_bar_response(), so
         * we can add buttons directly to the action
         * area without knowning their response IDs. */

        widget = gtk_button_new ();

        gtk_activatable_set_related_action (
            GTK_ACTIVATABLE (widget),
            GTK_ACTION (actions->data));

        gtk_box_pack_end (
            GTK_BOX (action_area), widget, FALSE, FALSE, 0);

        actions = g_list_next (actions);
    }

    /* Add a dismiss button. */
    widget = gtk_button_new ();
    gtk_button_set_image (
        GTK_BUTTON (widget),
        gtk_image_new_from_stock (
        GTK_STOCK_CLOSE, GTK_ICON_SIZE_MENU));
    gtk_button_set_relief (
        GTK_BUTTON (widget), GTK_RELIEF_NONE);
    gtk_widget_set_tooltip_text (
        /* Translators: Escape is a keyboard binding. */
        widget, _("Close this message (Escape)"));
    gtk_box_pack_end (
        GTK_BOX (action_area), widget, FALSE, FALSE, 0);
    gtk_button_box_set_child_non_homogeneous (
        GTK_BUTTON_BOX (action_area), widget, TRUE);
    gtk_widget_show (widget);

    g_signal_connect_swapped (
        widget, "clicked",
        G_CALLBACK (alert_bar_response_close), alert);

    primary_text = e_alert_get_primary_text (alert);
    secondary_text = e_alert_get_secondary_text (alert);

    if (primary_text == NULL)
        primary_text = "";

    if (secondary_text == NULL)
        secondary_text = "";

    have_primary_text = (*primary_text != '\0');
    have_secondary_text = (*secondary_text != '\0');

    response_id = e_alert_get_default_response (alert);
    gtk_info_bar_set_default_response (info_bar, response_id);

    message_type = e_alert_get_message_type (alert);
    gtk_info_bar_set_message_type (info_bar, message_type);

    widget = alert_bar->priv->primary_label;
    if (have_primary_text && have_secondary_text)
        markup = g_markup_printf_escaped (
            "<b>%s</b>", primary_text);
    else
        markup = g_markup_escape_text (primary_text, -1);
    gtk_label_set_markup (GTK_LABEL (widget), markup);
    gtk_widget_set_visible (widget, have_primary_text);
    g_free (markup);

    widget = alert_bar->priv->secondary_label;
    if (have_primary_text && have_secondary_text)
        markup = g_markup_printf_escaped (
            "<small>%s</small>", secondary_text);
    else
        markup = g_markup_escape_text (secondary_text, -1);
    gtk_label_set_markup (GTK_LABEL (widget), markup);
    gtk_widget_set_visible (widget, have_secondary_text);
    g_free (markup);

    stock_id = e_alert_get_stock_id (alert);
    image = GTK_IMAGE (alert_bar->priv->image);
    gtk_image_set_from_stock (image, stock_id, ICON_SIZE);

    /* Avoid showing an image for one-line alerts,
     * which are usually questions or informational. */
    visible = have_primary_text && have_secondary_text;
    gtk_widget_set_visible (alert_bar->priv->image, visible);

    gtk_widget_show (GTK_WIDGET (alert_bar));

    /* Warnings are generally meant for transient errors.
     * No need to leave them up indefinitely.  Close them
     * automatically if the user hasn't responded after a
     * reasonable period of time has elapsed. */
    if (message_type == GTK_MESSAGE_WARNING)
        e_alert_start_timer (alert, WARNING_TIMEOUT_SECONDS);
}

static void
alert_bar_response_cb (EAlert *alert,
                       gint response_id,
                       EAlertBar *alert_bar)
{
    GQueue *queue;
    EAlert *head;
    gboolean was_head;

    queue = &alert_bar->priv->alerts;
    head = g_queue_peek_head (queue);
    was_head = (alert == head);

    g_signal_handlers_disconnect_by_func (
        alert, alert_bar_response_cb, alert_bar);

    if (g_queue_remove (queue, alert))
        g_object_unref (alert);

    if (g_queue_is_empty (queue))
        gtk_widget_hide (GTK_WIDGET (alert_bar));
    else if (was_head) {
        GtkInfoBar *info_bar = GTK_INFO_BAR (alert_bar);
        gtk_info_bar_response (info_bar, response_id);
        alert_bar_show_alert (alert_bar);
    }
}

static void
alert_bar_dispose (GObject *object)
{
    EAlertBarPrivate *priv;

    priv = E_ALERT_BAR_GET_PRIVATE (object);

    while (!g_queue_is_empty (&priv->alerts)) {
        EAlert *alert = g_queue_pop_head (&priv->alerts);
        g_signal_handlers_disconnect_by_func (
            alert, alert_bar_response_cb, object);
        g_object_unref (alert);
    }

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

static void
alert_bar_constructed (GObject *object)
{
    EAlertBarPrivate *priv;
    GtkInfoBar *info_bar;
    GtkWidget *action_area;
    GtkWidget *content_area;
    GtkWidget *container;
    GtkWidget *widget;

    priv = E_ALERT_BAR_GET_PRIVATE (object);

    /* Chain up to parent's constructed() method. */
    G_OBJECT_CLASS (e_alert_bar_parent_class)->constructed (object);

    g_queue_init (&priv->alerts);

    info_bar = GTK_INFO_BAR (object);
    action_area = gtk_info_bar_get_action_area (info_bar);
    content_area = gtk_info_bar_get_content_area (info_bar);

    gtk_orientable_set_orientation (
        GTK_ORIENTABLE (action_area), GTK_ORIENTATION_HORIZONTAL);
    gtk_widget_set_valign (action_area, GTK_ALIGN_START);

    container = content_area;

    widget = gtk_image_new ();
    gtk_misc_set_alignment (GTK_MISC (widget), 0.5, 0.0);
    gtk_box_pack_start (GTK_BOX (container), widget, FALSE, FALSE, 0);
    priv->image = widget;
    gtk_widget_show (widget);

    widget = gtk_box_new (GTK_ORIENTATION_VERTICAL, 12);
    gtk_box_pack_start (GTK_BOX (container), widget, TRUE, TRUE, 0);
    gtk_widget_show (widget);

    container = widget;

    widget = gtk_label_new (NULL);
    gtk_label_set_line_wrap (GTK_LABEL (widget), TRUE);
    gtk_label_set_selectable (GTK_LABEL (widget), TRUE);
    gtk_misc_set_alignment (GTK_MISC (widget), 0.0, 0.5);
    gtk_box_pack_start (GTK_BOX (container), widget, FALSE, FALSE, 0);
    priv->primary_label = widget;
    gtk_widget_show (widget);

    widget = gtk_label_new (NULL);
    gtk_label_set_line_wrap (GTK_LABEL (widget), TRUE);
    gtk_label_set_selectable (GTK_LABEL (widget), TRUE);
    gtk_misc_set_alignment (GTK_MISC (widget), 0.0, 0.5);
    gtk_box_pack_start (GTK_BOX (container), widget, FALSE, FALSE, 0);
    priv->secondary_label = widget;
    gtk_widget_show (widget);

    container = action_area;
}

static GtkSizeRequestMode
alert_bar_get_request_mode (GtkWidget *widget)
{
    /* GtkBox does width-for-height by default.  But we
     * want the alert bar to be as short as possible. */
    return GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH;
}

static void
alert_bar_close (GtkInfoBar *info_bar)
{
    /* GtkInfoBar's close() method looks for a button with a response
     * code of GTK_RESPONSE_CANCEL.  But that does not apply here, so
     * we have to override the method. */
    e_alert_bar_close_alert (E_ALERT_BAR (info_bar));
}

static void
e_alert_bar_class_init (EAlertBarClass *class)
{
    GObjectClass *object_class;
    GtkWidgetClass *widget_class;
    GtkInfoBarClass *info_bar_class;

    g_type_class_add_private (class, sizeof (EAlertBarPrivate));

    object_class = G_OBJECT_CLASS (class);
    object_class->dispose = alert_bar_dispose;
    object_class->constructed = alert_bar_constructed;

    widget_class = GTK_WIDGET_CLASS (class);
    widget_class->get_request_mode = alert_bar_get_request_mode;

    info_bar_class = GTK_INFO_BAR_CLASS (class);
    info_bar_class->close = alert_bar_close;
}

static void
e_alert_bar_init (EAlertBar *alert_bar)
{
    alert_bar->priv = E_ALERT_BAR_GET_PRIVATE (alert_bar);
}

GtkWidget *
e_alert_bar_new (void)
{
    return g_object_new (E_TYPE_ALERT_BAR, NULL);
}

void
e_alert_bar_clear (EAlertBar *alert_bar)
{
    GQueue *queue;
    EAlert *alert;

    g_return_if_fail (E_IS_ALERT_BAR (alert_bar));

    queue = &alert_bar->priv->alerts;

    while ((alert = g_queue_pop_head (queue)) != NULL)
        alert_bar_response_close (alert);
}

typedef struct {
    gboolean found;
    EAlert *looking_for;
} DuplicateData;

static void
alert_bar_find_duplicate_cb (EAlert *alert,
                             DuplicateData *dd)
{
    g_return_if_fail (dd->looking_for != NULL);

    dd->found |= (
        e_alert_get_message_type (alert) ==
        e_alert_get_message_type (dd->looking_for) &&
        g_strcmp0 (
            e_alert_get_primary_text (alert),
            e_alert_get_primary_text (dd->looking_for)) == 0 &&
        g_strcmp0 (
            e_alert_get_secondary_text (alert),
            e_alert_get_secondary_text (dd->looking_for)) == 0);
}

void
e_alert_bar_add_alert (EAlertBar *alert_bar,
                       EAlert *alert)
{
    DuplicateData dd;

    g_return_if_fail (E_IS_ALERT_BAR (alert_bar));
    g_return_if_fail (E_IS_ALERT (alert));

    dd.found = FALSE;
    dd.looking_for = alert;

    g_queue_foreach (
        &alert_bar->priv->alerts,
        (GFunc) alert_bar_find_duplicate_cb, &dd);

    if (dd.found)
        return;

    g_signal_connect (
        alert, "response",
        G_CALLBACK (alert_bar_response_cb), alert_bar);

    g_queue_push_head (&alert_bar->priv->alerts, g_object_ref (alert));

    alert_bar_show_alert (alert_bar);
}

/**
 * e_alert_bar_close_alert:
 * @alert_bar: an #EAlertBar
 *
 * Closes the active #EAlert and returns %TRUE, or else returns %FALSE if
 * there is no active #EAlert.
 *
 * Returns: whether an #EAlert was closed
 **/
gboolean
e_alert_bar_close_alert (EAlertBar *alert_bar)
{
    EAlert *alert;
    gboolean alert_closed = FALSE;

    g_return_val_if_fail (E_IS_ALERT_BAR (alert_bar), FALSE);

    alert = g_queue_peek_head (&alert_bar->priv->alerts);

    if (alert != NULL) {
        alert_bar_response_close (alert);
        alert_closed = TRUE;
    }

    return alert_closed;
}