fix: #2

Author: nicosh

src/components/infobar/stats.js

@@ -4,9 +4,12 @@
 import { useEffect, useState } from "react"
 import { Progress,Switch  } from 'antd';
 import { useApp } from "../context/appContext";
+import useInterval from "./useInterval";
 const Stats = () => {
     const [memoryPercentage, setMemoryrcentage] = useState(false)
-    const [cpuPercentage, setCpuPercentage] = useState(false)
+    const [cpuPercentage, setCpuPercentage] = useState(0)
+    const [previousCpuInfo,setPreviousCpuInfo]= useState(false)
+
     const {theme,switchTeme } = useApp()
 
     // load memory and cpu usage from chrome apis
@@ -18,22 +21,30 @@ const Stats = () => {
         });
 
         chrome.system.cpu.getInfo(function (info) {
-            let totalUsage = info.processors.reduce((acc, el, index) => {
-                let used = Math.floor((el.usage.kernel + el.usage.user) / el.usage.total * 100);
-                acc += used
-                return acc
-            }, 0)
-            setCpuPercentage(totalUsage)
+            let totalp = 0
+            info.processors.forEach((el,index)=>{
+                let percentage = 0;
+                let usage = el.usage;
+                if (previousCpuInfo) {
+                    let oldUsage = previousCpuInfo.processors[index].usage;
+                    percentage = Math.floor((usage.kernel + usage.user - oldUsage.kernel - oldUsage.user) / (usage.total - oldUsage.total) * 100);
+                  } else {
+                    percentage = Math.floor((usage.kernel + usage.user) / usage.total * 100);
+                  }
+                totalp+= percentage
+            })
+            let p =  Math.floor(totalp/info.processors.length)
+            if(p > 0){
+                setCpuPercentage(p) // prevent flashing
+            }
+            setPreviousCpuInfo(info)
+
         });
     }
 
-    useEffect(() => {
+    useInterval(() => {
         loadData()
-        const interval = setInterval(() => {
-            loadData()
-        }, 1000);
-        return () => clearInterval(interval);
-    }, [])
+    }, 1000);
 
 
     return (

src/components/infobar/useInterval.js

@@ -0,0 +1,23 @@
+import React, { useState, useEffect, useRef } from 'react';
+
+function useInterval(callback, delay) {
+  const savedCallback = useRef();
+
+  // Remember the latest callback.
+  useEffect(() => {
+    savedCallback.current = callback;
+  }, [callback]);
+
+  // Set up the interval.
+  useEffect(() => {
+    function tick() {
+      savedCallback.current();
+    }
+    if (delay !== null) {
+      let id = setInterval(tick, delay);
+      return () => clearInterval(id);
+    }
+  }, [delay]);
+}
+
+export default useInterval

src/components/todo/index.js

@@ -32,7 +32,7 @@ const Todo = () => {
     setBoard(JSON.parse(savedBoard))
   }, [])
 
-  
+
   const handleCardMove = (board) => {
     let newBoard = JSON.stringify(board)
     localStorage.setItem('board', newBoard);