fix-timers

JS to fix the delay when switch tabs in some browsers

addons/widgets/countdown/fix-timers.js

@@ -0,0 +1,157 @@
+/**
+ * HackTimer.js by turuslan
+ */
+(function (workerScript) {
+  if (!/MSIE 10/i.test(navigator.userAgent)) {
+    try {
+      var blob = new Blob([
+        "\
+var fakeIdToId = {};\
+onmessage = function (event) {\
+	var data = event.data,\
+		name = data.name,\
+		fakeId = data.fakeId,\
+		time;\
+	if(data.hasOwnProperty('time')) {\
+		time = data.time;\
+	}\
+	switch (name) {\
+		case 'setInterval':\
+			fakeIdToId[fakeId] = setInterval(function () {\
+				postMessage({fakeId: fakeId});\
+			}, time);\
+			break;\
+		case 'clearInterval':\
+			if (fakeIdToId.hasOwnProperty (fakeId)) {\
+				clearInterval(fakeIdToId[fakeId]);\
+				delete fakeIdToId[fakeId];\
+			}\
+			break;\
+		case 'setTimeout':\
+			fakeIdToId[fakeId] = setTimeout(function () {\
+				postMessage({fakeId: fakeId});\
+				if (fakeIdToId.hasOwnProperty (fakeId)) {\
+					delete fakeIdToId[fakeId];\
+				}\
+			}, time);\
+			break;\
+		case 'clearTimeout':\
+			if (fakeIdToId.hasOwnProperty (fakeId)) {\
+				clearTimeout(fakeIdToId[fakeId]);\
+				delete fakeIdToId[fakeId];\
+			}\
+			break;\
+	}\
+}\
+",
+      ]);
+      // Obtain a blob URL reference to our worker 'file'.
+      workerScript = window.URL.createObjectURL(blob);
+    } catch (error) {
+      /* Blob is not supported, use external script instead */
+    }
+  }
+  var worker,
+    fakeIdToCallback = {},
+    lastFakeId = 0,
+    maxFakeId = 0x7fffffff, // 2 ^ 31 - 1, 31 bit, positive values of signed 32 bit integer
+    logPrefix = "fixTimers: ";
+  if (typeof Worker !== "undefined") {
+    function getFakeId() {
+      do {
+        if (lastFakeId == maxFakeId) {
+          lastFakeId = 0;
+        } else {
+          lastFakeId++;
+        }
+      } while (fakeIdToCallback.hasOwnProperty(lastFakeId));
+      return lastFakeId;
+    }
+    try {
+      worker = new Worker(workerScript);
+      window.setInterval = function (callback, time /* , parameters */) {
+        var fakeId = getFakeId();
+        fakeIdToCallback[fakeId] = {
+          callback: callback,
+          parameters: Array.prototype.slice.call(arguments, 2),
+        };
+        worker.postMessage({
+          name: "setInterval",
+          fakeId: fakeId,
+          time: time,
+        });
+        return fakeId;
+      };
+      window.clearInterval = function (fakeId) {
+        if (fakeIdToCallback.hasOwnProperty(fakeId)) {
+          delete fakeIdToCallback[fakeId];
+          worker.postMessage({
+            name: "clearInterval",
+            fakeId: fakeId,
+          });
+        }
+      };
+      window.setTimeout = function (callback, time /* , parameters */) {
+        var fakeId = getFakeId();
+        fakeIdToCallback[fakeId] = {
+          callback: callback,
+          parameters: Array.prototype.slice.call(arguments, 2),
+          isTimeout: true,
+        };
+        worker.postMessage({
+          name: "setTimeout",
+          fakeId: fakeId,
+          time: time,
+        });
+        return fakeId;
+      };
+      window.clearTimeout = function (fakeId) {
+        if (fakeIdToCallback.hasOwnProperty(fakeId)) {
+          delete fakeIdToCallback[fakeId];
+          worker.postMessage({
+            name: "clearTimeout",
+            fakeId: fakeId,
+          });
+        }
+      };
+      worker.onmessage = function (event) {
+        var data = event.data,
+          fakeId = data.fakeId,
+          request,
+          parameters,
+          callback;
+        if (fakeIdToCallback.hasOwnProperty(fakeId)) {
+          request = fakeIdToCallback[fakeId];
+          callback = request.callback;
+          parameters = request.parameters;
+          if (request.hasOwnProperty("isTimeout") && request.isTimeout) {
+            delete fakeIdToCallback[fakeId];
+          }
+        }
+        if (typeof callback === "string") {
+          try {
+            callback = new Function(callback);
+          } catch (error) {
+            console.log(
+              logPrefix + "Error parsing callback code string: ",
+              error
+            );
+          }
+        }
+        if (typeof callback === "function") {
+          callback.apply(window, parameters);
+        }
+      };
+      worker.onerror = function (event) {
+        console.log(event);
+      };
+    } catch (error) {
+      console.log(logPrefix + "Initialisation failed");
+      console.error(error);
+    }
+  } else {
+    console.log(
+      logPrefix + "Initialisation failed - HTML5 Web Worker is not supported"
+    );
+  }
+})("SMCstylus Addons for Elementor");