gst: Move play and pause button handling into gst code

I can handle these widgets directly from within the gst driver.  I think
this is easier (and more straightforward) than handling this in a
separate file.

Signed-off-by: Anna Schumaker <Anna@OcarinaProject.net>

gui/controls.cpp

@@ -7,26 +7,8 @@
 #include <gui/ocarina.h>
 
 static Gtk::Label *o_position;
-static Gtk::Button *o_play_button;
-static Gtk::Button *o_pause_button;
 static Glib::RefPtr<Gtk::Adjustment> o_pos_bar;
 
-static inline bool audio_playing()
-{
-	return audio :: get_driver()->is_playing();
-}
-
-void o_fix_buttons()
-{
-	if (audio_playing()) {
-		o_play_button->hide();
-		o_pause_button->show();
-	} else {
-		o_play_button->show();
-		o_pause_button->hide();
-	}
-}
-
 /*
  * Timeout function is called every half-second.
  */
@@ -35,37 +17,22 @@ static bool on_timeout()
 	o_position->set_text(audio :: position_str());
 	o_pos_bar->set_upper(audio :: duration());
 	o_pos_bar->set_value(audio :: position());
-
-	o_fix_buttons();
-	return audio_playing();
+	return true;
 }
 
 
-static void o_play()
-{
-	audio :: play();
-	o_fix_buttons();
-	lib :: schedule(on_timeout, 500);
-}
-
-static void o_pause()
-{
-	audio :: pause();
-	o_fix_buttons();
-}
-
 void o_toggle()
 {
-	if (audio_playing())
-		o_pause();
+	if (audio :: get_driver()->is_playing())
+		audio :: pause();
 	else
-		o_play();
+		audio :: play();
 }
 
 void o_next()
 {
 	audio :: next();
-	o_play();
+	audio :: play();
 }
 
 bool o_seek(Gtk::ScrollType type, double value)
@@ -82,13 +49,10 @@ void controls_init()
 	o_position = lib :: get_widget<Gtk::Label>("o_cur_position");
 	o_pos_bar  = lib :: get_object<Gtk::Adjustment>("o_progress");
 
-	o_play_button  = lib :: get_widget<Gtk::Button>("o_play");
-	o_pause_button = lib :: get_widget<Gtk::Button>("o_pause");
-
 	pos_scale->signal_change_value().connect(sigc::ptr_fun(o_seek));
-	connect_button("o_play", o_play);
-	connect_button("o_pause", o_pause);
 	connect_button("o_stop", audio::stop);
 	connect_button("o_prev", audio::prev);
 	connect_button("o_next", o_next);
+
+	lib :: schedule(on_timeout, 500);
 }

gui/gst.cpp

@@ -11,8 +11,10 @@
 #include <gst/gst.h>
 
 
-static GstBus     *gst_bus;
-static GstElement *gst_player;
+static GstBus      *gst_bus;
+static GstElement  *gst_player;
+static Gtk::Button *o_play;
+static Gtk::Button *o_pause;
 
 
 static bool gst_change_state(GstState state)
@@ -42,8 +44,21 @@ public:
 		on_track_loaded(track);
 	}
 
-	void play()  { gst_change_state(GST_STATE_PLAYING); }
-	void pause() { gst_change_state(GST_STATE_PAUSED);  }
+	void play()
+	{
+		if (gst_change_state(GST_STATE_PLAYING)) {
+			o_play->hide();
+			o_pause->show();
+		}
+	}
+
+	void pause()
+	{
+		if (gst_change_state(GST_STATE_PAUSED)) {
+			o_play->show();
+			o_pause->hide();
+		}
+	}
 
 	bool is_playing()
 	{
@@ -126,7 +141,12 @@ void init_gst(int *argc, char ***argv)
 	gst_bus    = gst_pipeline_get_bus(GST_PIPELINE(gst_player));
 	gst_driver = new GSTDriver();
 
+	o_play  = lib :: get_widget<Gtk::Button>("o_play");
+	o_pause = lib :: get_widget<Gtk::Button>("o_pause");
+
 	gst_bus_add_watch(gst_bus, on_gst_message, NULL);
+	o_play->signal_clicked().connect(sigc::ptr_fun(audio :: play));
+	o_pause->signal_clicked().connect(sigc::ptr_fun(audio :: pause));
 }
 
 void quit_gst()

gui/main.cpp

@@ -1,6 +1,7 @@
 /*
  * Copyright 2014 (c) Anna Schumaker.
  */
+#include <core/core.h>
 #include <core/playlist.h>
 #include <lib/lib.h>
 #include <gui/ocarina.h>
@@ -8,8 +9,9 @@
 
 Gtk::Window *ocarina_init(int *argc, char ***argv)
 {
-	init_gst(argc, argv);
 	lib :: init(argc, argv, "ocarina6.glade");
+	init_gst(argc, argv);
+	core :: init();
 
 	Gtk::Window *window = setup_gui();
 	post_init_tabs();

lib/lib.cpp

@@ -29,8 +29,6 @@ void lib :: init(int *argc, char ***argv, const std::string &gtk_xml)
 	builder = Gtk::Builder::create();
 	if (!builder->add_from_file(lib :: share_file(gtk_xml)))
 		exit(1);
-
-	core :: init();
 }
 
 const std::string lib :: share_file(const std::string &f)