path: root/widgets/misc/e-activity-bar.c

/*
 * e-activity-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/>
 *
 */

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

#include "e-activity-bar.h"

#define E_ACTIVITY_BAR_GET_PRIVATE(obj) \
    (G_TYPE_INSTANCE_GET_PRIVATE \
    ((obj), E_TYPE_ACTIVITY_BAR, EActivityBarPrivate))

#define FEEDBACK_PERIOD     1 /* seconds */
#define COMPLETED_ICON_NAME "emblem-default"

struct _EActivityBarPrivate {
    EActivity *activity;    /* weak reference */
    GtkWidget *image;   /* not referenced */
    GtkWidget *label;   /* not referenced */
    GtkWidget *cancel;  /* not referenced */
    GtkWidget *spinner; /* not referenced */

    /* If the user clicks the Cancel button, keep the cancelled
     * EActivity object alive for a short duration so the user
     * gets some visual feedback that cancellation worked. */
    guint timeout_id;
};

enum {
    PROP_0,
    PROP_ACTIVITY
};

G_DEFINE_TYPE (
    EActivityBar,
    e_activity_bar,
    GTK_TYPE_INFO_BAR)

static void
activity_bar_feedback (EActivityBar *bar)
{
    EActivity *activity;
    EActivityState state;

    activity = e_activity_bar_get_activity (bar);
    g_return_if_fail (E_IS_ACTIVITY (activity));

    state = e_activity_get_state (activity);
    if (state != E_ACTIVITY_CANCELLED && state != E_ACTIVITY_COMPLETED)
        return;

    if (bar->priv->timeout_id > 0)
        g_source_remove (bar->priv->timeout_id);

    /* Hold a reference on the EActivity for a short
     * period so the activity bar stays visible. */
    bar->priv->timeout_id = g_timeout_add_seconds_full (
        G_PRIORITY_LOW, FEEDBACK_PERIOD, (GSourceFunc) gtk_false,
        g_object_ref (activity), (GDestroyNotify) g_object_unref);
}

static void
activity_bar_update (EActivityBar *bar)
{
    EActivity *activity;
    EActivityState state;
    GCancellable *cancellable;
    const gchar *icon_name;
    gboolean sensitive;
    gboolean visible;
    gchar *description;

    activity = e_activity_bar_get_activity (bar);

    if (activity == NULL) {
        gtk_widget_hide (GTK_WIDGET (bar));
        return;
    }

    cancellable = e_activity_get_cancellable (activity);
    icon_name = e_activity_get_icon_name (activity);
    state = e_activity_get_state (activity);

    description = e_activity_describe (activity);
    gtk_label_set_text (GTK_LABEL (bar->priv->label), description);

    if (state == E_ACTIVITY_CANCELLED) {
        PangoAttribute *attr;
        PangoAttrList *attr_list;

        attr_list = pango_attr_list_new ();

        attr = pango_attr_strikethrough_new (TRUE);
        pango_attr_list_insert (attr_list, attr);

        gtk_label_set_attributes (
            GTK_LABEL (bar->priv->label), attr_list);

        pango_attr_list_unref (attr_list);
    } else
        gtk_label_set_attributes (
            GTK_LABEL (bar->priv->label), NULL);

    if (state == E_ACTIVITY_COMPLETED)
        icon_name = COMPLETED_ICON_NAME;

    if (state == E_ACTIVITY_CANCELLED) {
        gtk_image_set_from_stock (
            GTK_IMAGE (bar->priv->image),
            GTK_STOCK_CANCEL, GTK_ICON_SIZE_BUTTON);
        gtk_widget_show (bar->priv->image);
    } else if (icon_name != NULL) {
        gtk_image_set_from_icon_name (
            GTK_IMAGE (bar->priv->image),
            icon_name, GTK_ICON_SIZE_BUTTON);
        gtk_widget_show (bar->priv->image);
    } else {
        gtk_widget_hide (bar->priv->image);
    }

    visible = (cancellable != NULL);
    gtk_widget_set_visible (bar->priv->cancel, visible);

    sensitive = (state == E_ACTIVITY_RUNNING);
    gtk_widget_set_sensitive (bar->priv->cancel, sensitive);

    visible = (description != NULL && *description != '\0');
    gtk_widget_set_visible (GTK_WIDGET (bar), visible);

    g_free (description);
}

static void
activity_bar_cancel (EActivityBar *bar)
{
    EActivity *activity;
    GCancellable *cancellable;

    activity = e_activity_bar_get_activity (bar);
    g_return_if_fail (E_IS_ACTIVITY (activity));

    cancellable = e_activity_get_cancellable (activity);
    g_cancellable_cancel (cancellable);

    activity_bar_update (bar);
}

static void
activity_bar_weak_notify_cb (EActivityBar *bar,
                             GObject *where_the_object_was)
{
    g_return_if_fail (E_IS_ACTIVITY_BAR (bar));

    bar->priv->activity = NULL;
    e_activity_bar_set_activity (bar, NULL);
}

static void
activity_bar_set_property (GObject *object,
                           guint property_id,
                           const GValue *value,
                           GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_ACTIVITY:
            e_activity_bar_set_activity (
                E_ACTIVITY_BAR (object),
                g_value_get_object (value));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
activity_bar_get_property (GObject *object,
                           guint property_id,
                           GValue *value,
                           GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_ACTIVITY:
            g_value_set_object (
                value, e_activity_bar_get_activity (
                E_ACTIVITY_BAR (object)));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
activity_bar_dispose (GObject *object)
{
    EActivityBarPrivate *priv;

    priv = E_ACTIVITY_BAR_GET_PRIVATE (object);

    if (priv->timeout_id > 0) {
        g_source_remove (priv->timeout_id);
        priv->timeout_id = 0;
    }

    if (priv->activity != NULL) {
        g_signal_handlers_disconnect_matched (
            priv->activity, G_SIGNAL_MATCH_DATA,
            0, 0, NULL, NULL, object);
        g_object_weak_unref (
            G_OBJECT (priv->activity), (GWeakNotify)
            activity_bar_weak_notify_cb, object);
        priv->activity = NULL;
    }

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

static void
e_activity_bar_class_init (EActivityBarClass *class)
{
    GObjectClass *object_class;

    g_type_class_add_private (class, sizeof (EActivityBarPrivate));

    object_class = G_OBJECT_CLASS (class);
    object_class->set_property = activity_bar_set_property;
    object_class->get_property = activity_bar_get_property;
    object_class->dispose = activity_bar_dispose;

    g_object_class_install_property (
        object_class,
        PROP_ACTIVITY,
        g_param_spec_object (
            "activity",
            NULL,
            NULL,
            E_TYPE_ACTIVITY,
            G_PARAM_READWRITE |
            G_PARAM_CONSTRUCT));
}

static void
e_activity_bar_init (EActivityBar *bar)
{
    GtkWidget *container;
    GtkWidget *widget;

    bar->priv = E_ACTIVITY_BAR_GET_PRIVATE (bar);

    container = gtk_info_bar_get_content_area (GTK_INFO_BAR (bar));

    widget = gtk_hbox_new (FALSE, 12);
    gtk_container_add (GTK_CONTAINER (container), widget);
    gtk_widget_show (widget);

    container = widget;

    widget = gtk_image_new ();
    gtk_box_pack_start (GTK_BOX (container), widget, FALSE, FALSE, 0);
    bar->priv->image = widget;

    widget = gtk_spinner_new ();
    gtk_spinner_start (GTK_SPINNER (widget));
    gtk_box_pack_start (GTK_BOX (container), widget, FALSE, FALSE, 0);
    bar->priv->spinner = widget;

    /* The spinner is only visible when the image is not. */
    g_object_bind_property (
        bar->priv->image, "visible",
        bar->priv->spinner, "visible",
        G_BINDING_BIDIRECTIONAL |
        G_BINDING_SYNC_CREATE |
        G_BINDING_INVERT_BOOLEAN);

    widget = gtk_label_new (NULL);
    gtk_misc_set_alignment (GTK_MISC (widget), 0.0, 0.5);
    gtk_label_set_ellipsize (GTK_LABEL (widget), PANGO_ELLIPSIZE_END);
    gtk_box_pack_start (GTK_BOX (container), widget, TRUE, TRUE, 0);
    bar->priv->label = widget;
    gtk_widget_show (widget);

    /* This is only shown if the EActivity has a GCancellable. */
    widget = gtk_button_new_from_stock (GTK_STOCK_CANCEL);
    gtk_info_bar_add_action_widget (
        GTK_INFO_BAR (bar), widget, GTK_RESPONSE_CANCEL);
    bar->priv->cancel = widget;
    gtk_widget_hide (widget);

    g_signal_connect_swapped (
        widget, "clicked",
        G_CALLBACK (activity_bar_cancel), bar);
}

GtkWidget *
e_activity_bar_new (void)
{
    return g_object_new (E_TYPE_ACTIVITY_BAR, NULL);
}

EActivity *
e_activity_bar_get_activity (EActivityBar *bar)
{
    g_return_val_if_fail (E_IS_ACTIVITY_BAR (bar), NULL);

    return bar->priv->activity;
}

void
e_activity_bar_set_activity (EActivityBar *bar,
                             EActivity *activity)
{
    g_return_if_fail (E_IS_ACTIVITY_BAR (bar));

    if (activity != NULL)
        g_return_if_fail (E_IS_ACTIVITY (activity));

    if (bar->priv->timeout_id > 0) {
        g_source_remove (bar->priv->timeout_id);
        bar->priv->timeout_id = 0;
    }

    if (bar->priv->activity != NULL) {
        g_signal_handlers_disconnect_matched (
            bar->priv->activity, G_SIGNAL_MATCH_DATA,
            0, 0, NULL, NULL, bar);
        g_object_weak_unref (
            G_OBJECT (bar->priv->activity),
            (GWeakNotify) activity_bar_weak_notify_cb, bar);
    }

    bar->priv->activity = activity;

    if (activity != NULL) {
        g_object_weak_ref (
            G_OBJECT (activity), (GWeakNotify)
            activity_bar_weak_notify_cb, bar);

        g_signal_connect_swapped (
            activity, "notify::state",
            G_CALLBACK (activity_bar_feedback), bar);

        g_signal_connect_swapped (
            activity, "notify",
            G_CALLBACK (activity_bar_update), bar);
    }

    activity_bar_update (bar);

    g_object_notify (G_OBJECT (bar), "activity");
}