From 19ba83f27384a9807049881fef0b15708b88056e Mon Sep 17 00:00:00 2001
From: vitam <psyviccccc@gmail.com>
Date: Sat, 29 Jul 2017 22:35:07 +0200
Subject: [PATCH] add more comments

---
 js/directives/fileselect.js | 25 +++++++++++++------------
 1 file changed, 13 insertions(+), 12 deletions(-)

diff --git a/js/directives/fileselect.js b/js/directives/fileselect.js
index 235fddb..08904c3 100644
--- a/js/directives/fileselect.js
+++ b/js/directives/fileselect.js
@@ -34,7 +34,7 @@ app.directive("indeterminate", [
                         }
                     };
                 };
-                var passIfNotIsLeafChild = function (callback) { // ensure to execute callback only when this input hasn't subinput
+                var passIfNotIsLeafChild = function (callback) { // ensure to execute callback only when this input hasn't any subinput
                     return function () {
                         if (children.length === 0) {
                             callback.apply(this, arguments);
@@ -48,44 +48,45 @@ app.directive("indeterminate", [
                         }
                     };
                 };
-                var passIfIsIndeterminate = function (callback) { // pass through the event from the scope where they sent
+                var passIfIsIndeterminate = function (callback) { // pass through the event when this input is indeterminate
                     return function () {
                         if (!elem.prop("indeterminate")) {
                             return callback.apply(this, arguments);
                         }
                     };
                 };
-                var catchEventOnlyOnce = function (callback) { // only fire once, and stop event's propagation
-                    return function (event) {
-                        callback.apply(this, arguments);
-                        return event.stopPropagation();
-                    };
-                };
+                /* var catchEventOnlyOnce = function (callback) { // only fire once, and stop event's propagation
+                 return function (event) {
+                 callback.apply(this, arguments);
+                 return event.stopPropagation();
+                 };
+                 }; */
                 if (attr["indeterminate"] && parse(attr["indeterminate"]).constant) {
                     setIndeterminateState(scope.$eval(attr["indeterminate"])); // set to default value (set in template)
                 }
                 if (attr["indeterminate"] && parse(attr["indeterminate"]).constant && !scope.$eval(attr["indeterminate"])) {
                     // when this input wont have subinput, they will only receive parent change and emit child change event
                     ngModelCtrl.$viewChangeListeners.push(passIfNotIsLeafChild(function () {
-                        scope.$emit("childSelectedChange", get());
+                        scope.$emit("childSelectedChange", get()); // notifies parents to change their state
                     }));
                     scope.$on("ParentSelectedChange", passThroughThisScope(passIfNotIsLeafChild(
                         function (event, newVal) {
                             setModelValueWithSideEffect(newVal); // set value to parent's value; this will cause listener to emit childChange event; this won't be a infinite loop
                         })));
                     // init first time and only once
-                    scope.$emit("i'm child input", get);
+                    scope.$emit("i'm child input", get); // traverses upwards toward the root scope notifying the listeners for keep reference to this input's value
                     scope.$emit("childSelectedChange", get()); // force emitted, and force the parent change their state base on children at first time
                 } else {
                     // establish parent-child's relation
                     // listen for the child emitted token
-                    scope.$on("i'm child input", passThroughThisScope(
+                    scope.$on("i'm child input", passThroughThisScope( // can't apply pass passIfIsLeafChild, at beginning all has not child input
                         function (event, child) {
                             children.push(child);
                         })
                     );
                     var updateBaseOnChildrenState = function (event, newChildValue) {
                         if ((cacheSelectedSubInputNumber + cacheNoSelectedSubInputNumber) !== children.length) {
+                            // cache childern state
                             cacheSelectedSubInputNumber = 0;
                             cacheNoSelectedSubInputNumber = 0;
                             for (var i = 0; i < children.length; i++) {
@@ -106,7 +107,7 @@ app.directive("indeterminate", [
                                 cacheNoSelectedSubInputNumber++;
                             }
                         }
-                        var allSelected = (cacheNoSelectedSubInputNumber === 0);
+                        var allSelected = (cacheNoSelectedSubInputNumber === 0); // if doesn't has any no selected input
                         var anySeleted = (cacheSelectedSubInputNumber > 0);
                         setIndeterminateState(allSelected !== anySeleted); // if at least one is selected, but not all then set input property indeterminate to true
                         setModelValueWithSideEffect(allSelected); // change binding model value and trigger onchange event