Dismantled Singleton pattern of PowerSaver

The instance-on-demand didn't really work, since we needed explicit
control over this object's destruction to ensure the timer is stopped
when launching an application. And trying to combine getInstance() with
explicit external delete was just ugly.

src/gmenu2x.cpp

@@ -215,6 +215,7 @@ void GMenu2X::initCPULimits() {
 #endif
 
 GMenu2X::GMenu2X()
+	: input(powerSaver)
 {
 	usbnet = samba = inet = web = false;
 	useSelectionPng = false;
@@ -283,18 +284,14 @@ GMenu2X::GMenu2X()
 		exit(EXIT_FAILURE);
 	}
 
-	if (confInt["backlightTimeout"] > 0)
-        PowerSaver::getInstance()->setScreenTimeout( confInt["backlightTimeout"] );
+	powerSaver.setScreenTimeout(confInt["backlightTimeout"]);
+
 #ifdef ENABLE_CPUFREQ
 	setClock(confInt["menuClock"]);
 #endif
 }
 
 GMenu2X::~GMenu2X() {
-	if (PowerSaver::isRunning()) {
-		delete PowerSaver::getInstance();
-	}
-
 	fflush(NULL);
 	sc.clear();
 
@@ -704,12 +701,7 @@ void GMenu2X::showSettings() {
 		if (curMenuClock != confInt["menuClock"]) setClock(confInt["menuClock"]);
 #endif
 
-		if (confInt["backlightTimeout"] == 0) {
-			if (PowerSaver::isRunning())
-				delete PowerSaver::getInstance();
-		} else {
-			PowerSaver::getInstance()->setScreenTimeout( confInt["backlightTimeout"] );
-		}
+		powerSaver.setScreenTimeout(confInt["backlightTimeout"]);
 
 		input.repeatRateChanged();
 

src/gmenu2x.h

@@ -26,6 +26,7 @@
 #include "translator.h"
 #include "touchscreen.h"
 #include "inputmanager.h"
+#include "powersaver.h"
 #include "surface.h"
 #include "utilities.h"
 
@@ -144,6 +145,7 @@ public:
 		return std::make_pair(top, resY - top - bottom);
 	}
 
+	PowerSaver powerSaver;
 	InputManager input;
 
 	//Configuration hashes

src/inputmanager.cpp

@@ -57,7 +57,8 @@ bool InputManager::init(GMenu2X *gmenu2x, Menu *menu) {
 	return true;
 }
 
-InputManager::InputManager()
+InputManager::InputManager(PowerSaver& powerSaver)
+	: powerSaver(powerSaver)
 {
 #ifndef SDL_JOYSTICK_DISABLED
 	int i;
@@ -301,8 +302,8 @@ bool InputManager::getButton(Button *button, bool wait) {
 	if (i == BUTTON_TYPE_SIZE)
 		return false;
 
-	if (wait && PowerSaver::isRunning()) {
-		PowerSaver::getInstance()->resetScreenTimer();
+	if (wait) {
+		powerSaver.resetScreenTimer();
 	}
 
 	return true;

src/inputmanager.h

@@ -29,6 +29,7 @@
 
 class GMenu2X;
 class Menu;
+class PowerSaver;
 class InputManager;
 
 enum EventCode {
@@ -61,7 +62,7 @@ public:
 	};
 	#define BUTTON_TYPE_SIZE 10
 
-	InputManager();
+	InputManager(PowerSaver& powerSaver);
 	~InputManager();
 
 	bool init(GMenu2X *gmenu2x, Menu *menu);
@@ -81,6 +82,7 @@ private:
 
 	GMenu2X *gmenu2x;
 	Menu *menu;
+	PowerSaver& powerSaver;
 
 	ButtonMapEntry buttonMap[BUTTON_TYPE_SIZE];
 #ifndef SDL_JOYSTICK_DISABLED

src/powersaver.cpp

@@ -25,23 +25,14 @@ Uint32 screenTimerCallback(Uint32 timeout, void *d) {
 	return 0;
 }
 
-PowerSaver *PowerSaver::getInstance() {
-	if (!instance) {
-		instance = new PowerSaver();
-	}
-	return instance;
-}
-
-bool PowerSaver::isRunning() {
-	return !!instance;
-}
-
 PowerSaver::PowerSaver()
 	: screenState(false)
 	, screenTimeout(0)
 	, screenTimer(nullptr)
 {
 	enableScreen();
+	assert(!instance);
+	instance = this;
 }
 
 PowerSaver::~PowerSaver() {

src/powersaver.h

@@ -5,14 +5,12 @@
 
 class PowerSaver {
 public:
-	static PowerSaver *getInstance();
-	static bool isRunning();
+	PowerSaver();
 	~PowerSaver();
 	void resetScreenTimer();
 	void setScreenTimeout(unsigned int seconds);
 
 private:
-	PowerSaver();
 	void addScreenTimer();
 	void removeScreenTimer();
 	void setScreenBlanking(bool state);