contents of zip

scripts/wake_lock.js

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+// Use strict
+"use strict";
+
+
+// Classes
+
+// Wake lock class
+class WakeLock {
+
+	// Public
+	
+		// Constructor
+		constructor() {
+		
+			// Set lock
+			this.lock = WakeLock.NO_LOCK;
+			
+			// Set self
+			var self = this;
+			
+			// Document visibility change event
+			$(document).on("visibilitychange", function() {
+			
+				// Check if wake lock already exists and page is now visible
+				if(self.lock !== WakeLock.NO_LOCK && document["visibilityState"] === Common.VISIBILITY_STATE_VISIBLE) {
+				
+					// Request wake lock
+					navigator["wakeLock"].request("screen").then(function(lock) {
+					
+						// Set lock
+						self.lock = lock;
+					
+					// Catch errors
+					}).catch(function(error) {
+					
+						// Clear lock
+						self.lock = WakeLock.NO_LOCK;
+					});
+				}
+			});
+		}
+		
+		// Prevent lock
+		preventLock() {
+		
+			// Set self
+			var self = this;
+		
+			// Return promise
+			return new Promise(function(resolve, reject) {
+			
+				// Check if wake is already locked
+				if(self.lock !== WakeLock.NO_LOCK)
+				
+					// Resolve
+					resolve();
+		
+				// Otherwise check if wake lock is supported
+				else if(typeof navigator === "object" && navigator !== null && "wakeLock" in navigator === true) {
+				
+					// Request wake lock
+					navigator["wakeLock"].request("screen").then(function(lock) {
+					
+						// Set lock
+						self.lock = lock;
+						
+						// Resolve
+						resolve();
+					
+					// Catch errors
+					}).catch(function(error) {
+					
+						// Reject
+						reject();
+					});
+				}
+				
+				// Otherwise
+				else
+				
+					// Reject
+					reject();
+			});
+		}
+		
+		// Allow lock
+		allowLock() {
+		
+			// Set self
+			var self = this;
+		
+			// Return promise
+			return new Promise(function(resolve, reject) {
+			
+				// Check if wake is already unlocked
+				if(self.lock === WakeLock.NO_LOCK)
+				
+					// Resolve
+					resolve();
+				
+				// Otherwise
+				else {
+				
+					// Request wake unlock
+					self.lock.release().then(function() {
+					
+						// Clear lock
+						self.lock = WakeLock.NO_LOCK;
+						
+						// Resolve
+						resolve();
+					
+					// Catch errors
+					}).catch(function(error) {
+					
+						// Reject
+						reject();
+					});
+				}
+			});
+		}
+	
+	// Private
+	
+		// No lock
+		static get NO_LOCK() {
+		
+			// Return no lock
+			return null;
+		}
+}
+
+
+// Main function
+
+// Set global object's wake lock
+globalThis["WakeLock"] = WakeLock;