lcd4linux: add slots for more user involvement

Keeps gui stuff away from parts of /src/driver and
callbacks with messages should inform the user about possible
operations during activation or deactivation of service.
Reason: long breaks are mediating
freeze or unknown status that leave the user in the dark.

src/driver/lcd4l.cpp

@@ -8,6 +8,7 @@
 	Homepage: http://www.neutrino-images.de/
 
 	Copyright (C) 2016-2019 'TangoCash'
+	Copyright (C) 2021, Thilo Graf 'dbt'
 
 	License: GPL
 
@@ -153,6 +154,7 @@ void CLCD4l::InitLCD4l()
 
 void CLCD4l::StartLCD4l()
 {
+	OnBeforeStart();
 	if (!thrLCD4l)
 	{
 		dprintf(DEBUG_NORMAL, "\033[32m[CLCD4l] [%s - %d] starting thread with mode %d \033[0m\n", __func__, __LINE__, g_settings.lcd4l_support);
@@ -162,11 +164,15 @@ void CLCD4l::StartLCD4l()
 		dprintf(DEBUG_NORMAL, "\033[32m[CLCD4l] [%s - %d] thread [%p] is running\033[0m\n", __func__, __LINE__, thrLCD4l);
 	}
 	if (g_settings.lcd4l_support)
-		exec_initscript("lcd4linux", "start", "systemctl");
+	{
+		if (exec_initscript("lcd4linux", "start", "systemctl"))
+			OnAfterStart();
+	}
 }
 
 void CLCD4l::StopLCD4l()
 {
+	OnBeforeStop();
 	if (thrLCD4l)
 	{
 		dprintf(DEBUG_NORMAL, "\033[32m[CLCD4l] [%s - %d] stopping thread [%p]\033[0m\n", __func__, __LINE__, thrLCD4l);
@@ -179,7 +185,9 @@ void CLCD4l::StopLCD4l()
 		thrLCD4l = NULL;
 		dprintf(DEBUG_NORMAL, "\033[32m[CLCD4l] [%s - %d] thread [%p] terminated\033[0m\n", __func__, __LINE__, thrLCD4l);
 	}
-	exec_initscript("lcd4linux", "stop", "systemctl");
+
+	if (exec_initscript("lcd4linux", "stop", "systemctl"))
+		OnAfterStop();
 }
 
 void CLCD4l::SwitchLCD4l()
@@ -869,7 +877,11 @@ void CLCD4l::ParseInfo(uint64_t parseID, bool newID, bool firstRun)
 			WriteFile(LAYOUT, Layout);
 			m_Layout = Layout;
 			if (!firstRun)
-				exec_initscript("lcd4linux", "restart", "systemctl");
+			{
+				OnBeforeRestart();
+				if (exec_initscript("lcd4linux", "restart", "systemctl"))
+					OnAfterRestart();
+			}
 		}
 	}
 

src/driver/lcd4l.h

@@ -8,6 +8,7 @@
 	Homepage: http://www.neutrino-images.de/
 
 	Copyright (C) 2016-2019 'TangoCash'
+	Copyright (C) 2021, Thilo Graf 'dbt'
 
 	License: GPL
 
@@ -32,7 +33,7 @@
 
 #include <string>
 #include <thread>
-
+#include <sigc++/signal.h>
 
 class CLCD4l
 {
@@ -75,6 +76,16 @@ class CLCD4l
 			START_LCD4L 	= 1,
 			RELOAD_LCD4L	= 2
 		};
+
+		// use signal/slot handlers
+		// That is helping to keep the GUI code away from code inside ./src/driver.
+		sigc::signal<void> 	OnBeforeRestart,
+					OnAfterRestart,
+					OnBeforeStart,
+					OnAfterStart,
+					OnBeforeStop,
+					OnAfterStop;
+
 	private:
 		std::thread	*thrLCD4l;
 		static void	*LCD4lProc(void *arg);

src/gui/lcd4l_setup.cpp

@@ -8,6 +8,7 @@
 	Homepage: http://www.neutrino-images.de/
 
 	Modded	  (C) 2016 'TangoCash'
+		  (C) 2021, Thilo Graf 'dbt'
 
 	License: GPL
 
@@ -22,9 +23,7 @@
 	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, write to the Free Software
+	along with this program. If not, see <http://www.gnu.org/licenses/>.
-	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
 */
 
 #ifdef HAVE_CONFIG_H
@@ -87,15 +86,24 @@ const CMenuOptionChooser::keyval LCD4L_SKIN_OPTIONS[] =
 };
 #define LCD4L_SKIN_OPTION_COUNT (sizeof(LCD4L_SKIN_OPTIONS)/sizeof(CMenuOptionChooser::keyval))
 
+using namespace sigc;
+
 CLCD4lSetup::CLCD4lSetup()
 {
 	width = 40;
-
+	hint = NULL;
 	lcd4l_display_type_changed = false;
+
+	sl_start = bind(mem_fun(*this, &CLCD4lSetup::showHint), "Starting lcd service...");
+	sl_stop = bind(mem_fun(*this, &CLCD4lSetup::showHint), "Stopping lcd service...");
+	sl_restart = bind(mem_fun(*this, &CLCD4lSetup::showHint), "Restarting lcd service...");
+	sl_remove = mem_fun(*this, &CLCD4lSetup::removeHint);
+	connectSlots();
 }
 
 CLCD4lSetup::~CLCD4lSetup()
 {
+	removeHint();
 }
 
 CLCD4lSetup* CLCD4lSetup::getInstance()
@@ -292,3 +300,32 @@ int CLCD4lSetup::showTypeSetup()
 
 	return typeSetup->exec(NULL, "");
 }
+
+void CLCD4lSetup::showHint(const std::string &text)
+{
+	removeHint();
+	hint = new CHint(text.c_str());
+	hint->paint();
+
+}
+
+void CLCD4lSetup::removeHint()
+{
+	if (hint)
+	{
+		hint->hide();
+		delete hint;
+		hint = NULL;
+	}
+}
+
+void CLCD4lSetup::connectSlots()
+{
+	CLCD4l::getInstance()->OnBeforeStart.connect(sl_start);
+	CLCD4l::getInstance()->OnBeforeStop.connect(sl_stop);
+	CLCD4l::getInstance()->OnBeforeRestart.connect(sl_restart);
+
+	CLCD4l::getInstance()->OnAfterStart.connect(sl_remove);
+	CLCD4l::getInstance()->OnAfterStop.connect(sl_remove);
+	CLCD4l::getInstance()->OnAfterRestart.connect(sl_remove);
+}

src/gui/lcd4l_setup.h

@@ -8,6 +8,7 @@
 	Homepage: http://www.neutrino-images.de/
 
 	Modded	  (C) 2016 'TangoCash'
+		  (C) 2021, Thilo Graf 'dbt'
 
 	License: GPL
 
@@ -22,16 +23,16 @@
 	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, write to the Free Software
+	along with this program. If not, see <http://www.gnu.org/licenses/>.
-	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
 */
 
 
 #ifndef __lcd4l_setup__
 #define __lcd4l_setup__
 
-#include <gui/widget/menue.h>
+#include "gui/widget/menue.h"
+#include "gui/widget/hintbox.h"
+#include <sigc++/signal.h>
 
 class CLCD4lSetup : public CMenuTarget, CChangeObserver
 {
@@ -45,12 +46,20 @@ class CLCD4lSetup : public CMenuTarget, CChangeObserver
 		int show();
 		int showTypeSetup();
 
+		//messages
+		CHint *hint;
+		void removeHint();
+		void showHint(const std::string &text);
+		//slots
+		sigc::slot<void> sl_start, sl_stop, sl_restart, sl_remove;
+
 	public:
 		static CLCD4lSetup* getInstance();
 		CLCD4lSetup();
 		~CLCD4lSetup();
 		int exec(CMenuTarget *parent, const std::string &actionkey);
 		virtual bool changeNotify(const neutrino_locale_t OptionName, void * /*data*/);
+		void connectSlots();
 };
 
 #endif