gui: Actions: Toggle backlight on power key

Create GUIAction to handle KEY_POWER with a screen backlight toggle.

Change-Id: Iad0a7923b4a776e0336722db74d6fc46cd0107a2

gui/action.cpp

@@ -198,6 +198,7 @@ GUIAction::GUIAction(xml_node<>* node)
 		ADD_ACTION(mountsystemtoggle);
 		ADD_ACTION(setlanguage);
 		ADD_ACTION(checkforapp);
+		ADD_ACTION(togglebacklight);
 
 		// remember actions that run in the caller thread
 		for (mapFunc::const_iterator it = mf.begin(); it != mf.end(); ++it)
@@ -1865,6 +1866,12 @@ int GUIAction::setlanguage(std::string arg __unused)
 	return 0;
 }
 
+int GUIAction::togglebacklight(std::string arg __unused)
+{
+	blankTimer.toggleBlank();
+	return 0;
+}
+
 int GUIAction::setbootslot(std::string arg)
 {
 	operation_start("Set Boot Slot");

gui/blanktimer.cpp

@@ -116,3 +116,37 @@ void blanktimer::resetTimerAndUnblank(void) {
 	pthread_mutex_unlock(&mutex);
 #endif
 }
+
+void blanktimer::blank(void) {
+/*  1) No need for timer handling since checkForTimeout() verifies
+ *     state of screen before performing screen-off
+ *  2) Assume screen-off causes issues for devices that set
+ *     TW_NO_SCREEN_TIMEOUT and do not blank screen here either
+ */
+
+#ifndef TW_NO_SCREEN_TIMEOUT
+	pthread_mutex_lock(&mutex);
+	if (state == kOn) {
+		orig_brightness = getBrightness();
+		state = kOff;
+		TWFunc::Set_Brightness("0");
+		TWFunc::check_and_run_script("/sbin/postscreenblank.sh", "blank");
+	}
+#ifndef TW_NO_SCREEN_BLANK
+	if (state == kOff) {
+		gr_fb_blank(true);
+		state = kBlanked;
+	}
+#endif
+	pthread_mutex_unlock(&mutex);
+#endif
+}
+
+void blanktimer::toggleBlank(void) {
+	if (state == kOn) {
+		blank();
+		PageManager::ChangeOverlay("lock");
+	} else {
+		resetTimerAndUnblank();
+	}
+}

gui/blanktimer.hpp

@@ -37,11 +37,15 @@ public:
 	// call this when an input event is received or when an operation is finished
 	void resetTimerAndUnblank();
 
+	// call this when power button is pressed
+	void toggleBlank(void);
+
 	bool isScreenOff();
 
 private:
 	void setTimer(void);
 	string getBrightness(void);
+	void blank(void);
 
 	pthread_mutex_t mutex;
 	enum State { kOn = 0, kDim = 1, kOff = 2, kBlanked = 3 };

gui/gui.cpp

@@ -205,7 +205,9 @@ bool InputHandler::processInput(int timeout_ms)
 		break;
 	}
 
-	blankTimer.resetTimerAndUnblank();
+	if (ev.code != KEY_POWER && ev.code > KEY_RESERVED)
+		blankTimer.resetTimerAndUnblank();
+
 	return true;  // we got an event, so there might be more in the queue
 }
 

gui/objects.hpp

@@ -363,6 +363,7 @@ protected:
 	int checkpartitionlifetimewrites(std::string arg);
 	int mountsystemtoggle(std::string arg);
 	int setlanguage(std::string arg);
+	int togglebacklight(std::string arg);
 	int twcmd(std::string arg);
 	int setbootslot(std::string arg);
 	int installapp(std::string arg);

gui/theme/common/landscape.xml

@@ -3517,6 +3517,11 @@
 				<text>{@swipe_to_unlock=Swipe to Unlock}</text>
 				<action function="overlay"/>
 			</slider>
+
+			<action>
+				<touch key="power"/>
+				<action function="togglebacklight"/>
+			</action>
 		</page>
 
 		<page name="filemanagerlist">

gui/theme/common/portrait.xml

@@ -3779,6 +3779,11 @@
 				<text>{@swipe_to_unlock=Swipe to Unlock}</text>
 				<action function="overlay"/>
 			</slider>
+
+			<action>
+				<touch key="power"/>
+				<action function="togglebacklight"/>
+			</action>
 		</page>
 
 		<page name="filemanagerlist">

gui/theme/common/watch.xml

@@ -4424,6 +4424,11 @@
 				<text>{@swipe_unlock=   Unlock}</text>
 				<action function="overlay"/>
 			</slider>
+
+			<action>
+				<touch key="power"/>
+				<action function="togglebacklight"/>
+			</action>
 		</page>
 
 		<page name="filemanagerlist">

gui/theme/landscape_hdpi/ui.xml

@@ -432,7 +432,7 @@
 
 			<action>
 				<touch key="power"/>
-				<action function="overlay">lock</action>
+				<action function="togglebacklight"/>
 			</action>
 
 			<action>

gui/theme/landscape_mdpi/ui.xml

@@ -432,7 +432,7 @@
 
 			<action>
 				<touch key="power"/>
-				<action function="overlay">lock</action>
+				<action function="togglebacklight"/>
 			</action>
 
 			<action>

gui/theme/portrait_hdpi/ui.xml

@@ -336,7 +336,7 @@
 
 			<action>
 				<touch key="power"/>
-				<action function="overlay">lock</action>
+				<action function="togglebacklight"/>
 			</action>
 
 			<action>

gui/theme/portrait_mdpi/ui.xml

@@ -336,7 +336,7 @@
 
 			<action>
 				<touch key="power"/>
-				<action function="overlay">lock</action>
+				<action function="togglebacklight"/>
 			</action>
 
 			<action>

gui/theme/watch_mdpi/ui.xml

@@ -258,7 +258,7 @@
 
 			<action>
 				<touch key="power"/>
-				<action function="overlay">lock</action>
+				<action function="togglebacklight"/>
 			</action>
 
 			<action>