evolution/widgets/misc/e-online-button.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/>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 */

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

#include "e-online-button.h"

#include <glib/gi18n.h>

#define ONLINE_TOOLTIP \
	_("Evolution is currently online.  Click this button to work offline.")

#define OFFLINE_TOOLTIP \
	_("Evolution is currently offline.  Click this button to work online.")

#define NETWORK_UNAVAILABLE_TOOLTIP \
	_("Evolution is currently offline because the network is unavailable.")

struct _EOnlineButtonPrivate {
	GtkWidget *image;
	gboolean online;
};

enum {
	PROP_0,
	PROP_ONLINE
};

G_DEFINE_TYPE (
	EOnlineButton,
	e_online_button,
	GTK_TYPE_BUTTON)

static void
online_button_update_tooltip (EOnlineButton *button)
{
	const gchar *tooltip;

	if (e_online_button_get_online (button))
		tooltip = ONLINE_TOOLTIP;
	else if (gtk_widget_get_sensitive (GTK_WIDGET (button)))
		tooltip = OFFLINE_TOOLTIP;
	else
		tooltip = NETWORK_UNAVAILABLE_TOOLTIP;

	gtk_widget_set_tooltip_text (GTK_WIDGET (button), tooltip);
}

static void
online_button_set_property (GObject *object,
                             guint property_id,
                             const GValue *value,
                             GParamSpec *pspec)
{
	switch (property_id) {
		case PROP_ONLINE:
			e_online_button_set_online (
				E_ONLINE_BUTTON (object),
				g_value_get_boolean (value));
			return;
	}

	G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
online_button_get_property (GObject *object,
                             guint property_id,
                             GValue *value,
                             GParamSpec *pspec)
{
	switch (property_id) {
		case PROP_ONLINE:
			g_value_set_boolean (
				value, e_online_button_get_online (
				E_ONLINE_BUTTON (object)));
			return;
	}

	G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
online_button_dispose (GObject *object)
{
	EOnlineButtonPrivate *priv;

	priv = E_ONLINE_BUTTON (object)->priv;

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

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

static void
e_online_button_class_init (EOnlineButtonClass *class)
{
	GObjectClass *object_class;

	g_type_class_add_private (class, sizeof (EOnlineButtonPrivate));

	object_class = G_OBJECT_CLASS (class);
	object_class->set_property = online_button_set_property;
	object_class->get_property = online_button_get_property;
	object_class->dispose = online_button_dispose;

	g_object_class_install_property (
		object_class,
		PROP_ONLINE,
		g_param_spec_boolean (
			"online",
			"Online",
			"The button state is online",
			TRUE,
			G_PARAM_READWRITE |
			G_PARAM_CONSTRUCT));
}

static void
e_online_button_init (EOnlineButton *button)
{
	GtkWidget *widget;

	button->priv = G_TYPE_INSTANCE_GET_PRIVATE (
		button, E_TYPE_ONLINE_BUTTON, EOnlineButtonPrivate);

	gtk_widget_set_can_focus (GTK_WIDGET (button), FALSE);
	gtk_button_set_relief (GTK_BUTTON (button), GTK_RELIEF_NONE);

	widget = gtk_image_new ();
	gtk_container_add (GTK_CONTAINER (button), widget);
	button->priv->image = g_object_ref (widget);
	gtk_widget_show (widget);

	g_signal_connect (
		button, "notify::online",
		G_CALLBACK (online_button_update_tooltip), NULL);

	g_signal_connect (
		button, "notify::sensitive",
		G_CALLBACK (online_button_update_tooltip), NULL);
}

GtkWidget *
e_online_button_new (void)
{
	return g_object_new (E_TYPE_ONLINE_BUTTON, NULL);
}

gboolean
e_online_button_get_online (EOnlineButton *button)
{
	g_return_val_if_fail (E_IS_ONLINE_BUTTON (button), FALSE);

	return button->priv->online;
}

void
e_online_button_set_online (EOnlineButton *button,
                            gboolean online)
{
	GtkImage *image;
	GtkIconInfo *icon_info;
	GtkIconTheme *icon_theme;
	const gchar *filename;
	const gchar *icon_name;

	g_return_if_fail (E_IS_ONLINE_BUTTON (button));

	button->priv->online = online;

	image = GTK_IMAGE (button->priv->image);
	icon_name = online ? "online" : "offline";
	icon_theme = gtk_icon_theme_get_default ();

	/* Prevent GTK+ from scaling these rectangular icons. */
	icon_info = gtk_icon_theme_lookup_icon (
		icon_theme, icon_name, GTK_ICON_SIZE_BUTTON, 0);
	filename = gtk_icon_info_get_filename (icon_info);
	gtk_image_set_from_file (image, filename);
	gtk_icon_info_free (icon_info);

	g_object_notify (G_OBJECT (button), "online");
}