Move isVisible() method

assets/js/core/utils.js

@@ -94,3 +94,23 @@ KB.utils.getViewportSize = function () {
         height: Math.max(document.documentElement.clientHeight, window.innerHeight || 0)
     };
 };
+
+KB.utils.isVisible = function() {
+    var property = '';
+
+    if (typeof document.hidden !== 'undefined') {
+        property = 'visibilityState';
+    } else if (typeof document.mozHidden !== 'undefined') {
+        property = 'mozVisibilityState';
+    } else if (typeof document.msHidden !== 'undefined') {
+        property = 'msVisibilityState';
+    } else if (typeof document.webkitHidden !== 'undefined') {
+        property = 'webkitVisibilityState';
+    }
+
+    if (property !== '') {
+        return document[property] === 'visible';
+    }
+
+    return true;
+};

assets/js/src/App.js

@@ -112,23 +112,3 @@ Kanboard.App.prototype.showLoadingIcon = function() {
 Kanboard.App.prototype.hideLoadingIcon = function() {
     $("#app-loading-icon").remove();
 };
-
-Kanboard.App.prototype.isVisible = function() {
-    var property = "";
-
-    if (typeof document.hidden !== "undefined") {
-        property = "visibilityState";
-    } else if (typeof document.mozHidden !== "undefined") {
-        property = "mozVisibilityState";
-    } else if (typeof document.msHidden !== "undefined") {
-        property = "msVisibilityState";
-    } else if (typeof document.webkitHidden !== "undefined") {
-        property = "webkitVisibilityState";
-    }
-
-    if (property !== "") {
-        return document[property] == "visible";
-    }
-
-    return true;
-};

assets/js/src/BoardPolling.js

@@ -13,7 +13,7 @@ Kanboard.BoardPolling.prototype.execute = function() {
 };
 
 Kanboard.BoardPolling.prototype.check = function() {
-    if (this.app.isVisible() && !this.app.get("BoardDragAndDrop").savingInProgress) {
+    if (KB.utils.isVisible() && !this.app.get("BoardDragAndDrop").savingInProgress) {
         var self = this;
         this.app.showLoadingIcon();