Panel
/* $Id$ */
							/* Copyright (c) 2014-2020 Pierre Pronchery <khorben@defora.org> */
							/* This file is part of DeforaOS Desktop Panel */
							/* This program is free software: you can redistribute it and/or modify
							 * it under the terms of the GNU General Public License as published by
							 * the Free Software Foundation, version 3 of the License.
							 *
							 * 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 General Public License
							 * along with this program.  If not, see <http://www.gnu.org/licenses/>. */
							#include <libintl.h>
							#include <System.h>
							#include <Desktop.h>
							#include "Panel/applet.h"
							#define _(string) gettext(string)
							#define N_(string) string
							/* constants */
							#ifndef MPD_COMMAND_FORWARD
							# define MPD_COMMAND_FORWARD	"mpd --forward"
							#endif
							#ifndef MPD_COMMAND_NEXT
							# define MPD_COMMAND_NEXT	"mpd --next"
							#endif
							#ifndef MPD_COMMAND_PAUSE
							# define MPD_COMMAND_PAUSE	"mpd --play-pause"
							#endif
							#ifndef MPD_COMMAND_PLAY
							# define MPD_COMMAND_PLAY	"mpd --play"
							#endif
							#ifndef MPD_COMMAND_PREVIOUS
							# define MPD_COMMAND_PREVIOUS	"mpd --previous"
							#endif
							#ifndef MPD_COMMAND_REWIND
							# define MPD_COMMAND_REWIND	"mpd --rewind"
							#endif
							#ifndef MPD_COMMAND_STOP
							# define MPD_COMMAND_STOP	"mpd --stop"
							#endif
							/* MPD */
							/* private */
							/* types */
							typedef struct _PanelApplet
							{
								PanelAppletHelper * helper;
								GtkWidget * widget;
							} MPD;
							/* prototypes */
							static MPD * _mpd_init(PanelAppletHelper * helper, GtkWidget ** widget);
							static void _mpd_destroy(MPD * mpd);
							/* useful */
							static void _mpd_exec(MPD * mpd, char const * command);
							/* callbacks */
							static void _mpd_on_forward(gpointer data);
							static void _mpd_on_next(gpointer data);
							static void _mpd_on_pause(gpointer data);
							static void _mpd_on_play(gpointer data);
							static void _mpd_on_previous(gpointer data);
							static void _mpd_on_rewind(gpointer data);
							static void _mpd_on_stop(gpointer data);
							/* public */
							/* variables */
							PanelAppletDefinition applet =
							{
								N_("MPD"),
								"multimedia",
								NULL,
								_mpd_init,
								_mpd_destroy,
								NULL,
								FALSE,
								TRUE
							};
							/* private */
							/* functions */
							/* mpd_init */
							static void _init_add(MPD * mpd, char const * stock, GtkIconSize iconsize,
									char const * tooltip, GCallback callback);
							static MPD * _mpd_init(PanelAppletHelper * helper, GtkWidget ** widget)
							{
								MPD * mpd;
								GtkOrientation orientation;
								GtkIconSize iconsize;
								if((mpd = object_new(sizeof(*mpd))) == NULL)
									return NULL;
								mpd->helper = helper;
								orientation = panel_window_get_orientation(helper->window);
							#if GTK_CHECK_VERSION(3, 0, 0)
								mpd->widget = gtk_box_new(orientation, 0);
							#else
								mpd->widget = (orientation == GTK_ORIENTATION_HORIZONTAL)
									? gtk_hbox_new(FALSE, 0) : gtk_vbox_new(FALSE, 0);
							#endif
								iconsize = panel_window_get_icon_size(helper->window);
								_init_add(mpd, GTK_STOCK_MEDIA_PREVIOUS, iconsize, _("Previous"),
										G_CALLBACK(_mpd_on_previous));
								_init_add(mpd, GTK_STOCK_MEDIA_REWIND, iconsize, _("Rewind"),
										G_CALLBACK(_mpd_on_rewind));
								_init_add(mpd, GTK_STOCK_MEDIA_PLAY, iconsize, _("Play"),
										G_CALLBACK(_mpd_on_play));
								_init_add(mpd, GTK_STOCK_MEDIA_PAUSE, iconsize, _("Pause"),
										G_CALLBACK(_mpd_on_pause));
								_init_add(mpd, GTK_STOCK_MEDIA_STOP, iconsize, _("Stop"),
										G_CALLBACK(_mpd_on_stop));
								_init_add(mpd, GTK_STOCK_MEDIA_FORWARD, iconsize, _("Forward"),
										G_CALLBACK(_mpd_on_forward));
								_init_add(mpd, GTK_STOCK_MEDIA_NEXT, iconsize, _("Next"),
										G_CALLBACK(_mpd_on_next));
								gtk_widget_show_all(mpd->widget);
								*widget = mpd->widget;
								return mpd;
							}
							static void _init_add(MPD * mpd, char const * stock, GtkIconSize iconsize,
									char const * tooltip, GCallback callback)
							{
								GtkWidget * button;
								GtkWidget * image;
								button = gtk_button_new();
							#if GTK_CHECK_VERSION(3, 10, 0)
								image = gtk_image_new_from_icon_name(stock, iconsize);
							#else
								image = gtk_image_new_from_stock(stock, iconsize);
							#endif
								gtk_button_set_image(GTK_BUTTON(button), image);
								gtk_button_set_relief(GTK_BUTTON(button), GTK_RELIEF_NONE);
							#if GTK_CHECK_VERSION(2, 12, 0)
								gtk_widget_set_tooltip_text(button, tooltip);
							#endif
								g_signal_connect_swapped(button, "clicked", callback, mpd);
								gtk_box_pack_start(GTK_BOX(mpd->widget), button, FALSE, TRUE, 0);
							}
							/* mpd_destroy */
							static void _mpd_destroy(MPD * mpd)
							{
								gtk_widget_destroy(mpd->widget);
								object_delete(mpd);
							}
							/* useful */
							/* mpd_exec */
							static void _mpd_exec(MPD * mpd, char const * command)
							{
								GError * error = NULL;
								if(g_spawn_command_line_async(command, &error) == FALSE)
								{
									mpd->helper->error(NULL, error->message, 1);
									g_error_free(error);
								}
							}
							/* callbacks */
							/* mpd_on_forward */
							static void _mpd_on_forward(gpointer data)
							{
								MPD * mpd = data;
								_mpd_exec(mpd, MPD_COMMAND_FORWARD);
							}
							/* mpd_on_next */
							static void _mpd_on_next(gpointer data)
							{
								MPD * mpd = data;
								_mpd_exec(mpd, MPD_COMMAND_NEXT);
							}
							/* mpd_on_pause */
							static void _mpd_on_pause(gpointer data)
							{
								MPD * mpd = data;
								_mpd_exec(mpd, MPD_COMMAND_PAUSE);
							}
							/* mpd_on_play */
							static void _mpd_on_play(gpointer data)
							{
								MPD * mpd = data;
								_mpd_exec(mpd, MPD_COMMAND_PLAY);
							}
							/* mpd_on_previous */
							static void _mpd_on_previous(gpointer data)
							{
								MPD * mpd = data;
								_mpd_exec(mpd, MPD_COMMAND_PREVIOUS);
							}
							/* mpd_on_rewind */
							static void _mpd_on_rewind(gpointer data)
							{
								MPD * mpd = data;
								_mpd_exec(mpd, MPD_COMMAND_REWIND);
							}
							/* mpd_on_stop */
							static void _mpd_on_stop(gpointer data)
							{
								MPD * mpd = data;
								_mpd_exec(mpd, MPD_COMMAND_STOP);
							}
							