From e7ac090005e1107b20b75cfc25eb661f23df4dbe Mon Sep 17 00:00:00 2001
From: bkanhu <iamkanhuc@gmail.com>
Date: Thu, 21 May 2020 09:18:49 +0000
Subject: [PATCH] add light/dark mode switcher. and add css variable to reduce time while changing color of webpage.

---
 layouts/partials/navbar.html |    7 ++
 assets/css/style.css         |  121 ++++++++++++++++++++++++++++++++-------
 layouts/partials/head.html   |    1 
 layouts/partials/footer.html |   26 ++++++++
 4 files changed, 132 insertions(+), 23 deletions(-)

diff --git a/assets/css/style.css b/assets/css/style.css
index 4f788ff..c5d4079 100644
--- a/assets/css/style.css
+++ b/assets/css/style.css
@@ -1,16 +1,37 @@
 @charset "UTF-8";
+:root{
+  --bg-color:#fff;
+  --heading-color: #5f5f5f;
+  --body-color: rgba(0, 0, 0, 0.5);
+  --post-color: rgba(0, 0, 0, 0.44);
+  --border-color: rgba(0, 0, 0, 0.15);
+  --pre-bg-color: #f9f9fd;
+  --nav-text-color:#5a5a5a;
+  --tag-color: #424242;
+}
 html {
-  background-color: #fff;
+  background-color: var(--bg-color);
   -webkit-font-smoothing: antialiased;
 }
-
+html[data-theme='dark'] {
+  --bg-color:#222831;
+  --secondary-bg-color: #393e46;
+  --heading-color: #d65a31;
+  --body-color: white;
+  --post-color: rgba(0, 0, 0, 0.44);
+  --border-color: rgba(0, 0, 0, 0.15);
+  --nav-text-color: #fff;
+  --pre-bg-color: #21212d;
+  --tag-color: rgb(83, 83, 83) !important;
+  
+}
 body {
-  color: rgba(0, 0, 0, 0.5);
+  color: var(--body-color);
   font-family: 'Verdana', sans-serif;
   font-size: 15px;
   width: 100%;
   margin: 0 auto 30px auto;
-  background-color: #fff;
+  background-color: var(--bg-color);
 }
 
 p {
@@ -44,7 +65,7 @@
 }
 
 pre {
-  background-color: #f9f9fd;
+  background-color: var(--pre-bg-color);
   padding: 5px;
   display: block;
   overflow-x: auto;
@@ -152,7 +173,7 @@
   position: fixed;
   right: 0;
   z-index: 3;
-  background-color: #fff;
+  background-color: var(--secondary-bg-color);
   height: 60px;
   border-bottom: 1px solid #f2f2f2;
 }
@@ -168,15 +189,68 @@
   padding-right: 20px;
 }
 .page-top .nav a {
-  color: #5A5A5A;
+  color: var(--nav-text-color);
 }
 .page-top .nav a:hover {
   color: #4786D6;
 }
 .page-top .nav a.current {
-  color: #5A5A5A;
+  color: var(--nav-text-color);
   padding-bottom: 22px;
-  border-bottom: 1px solid #5A5A5A;
+  border-bottom: 1px solid var(--nav-text-color);
+}
+
+.theme-switch {
+  display: inline-block;
+  height: 34px;
+  position: relative;
+  width: 60px;
+}
+.theme-switch-wrapper{
+
+	float: right;
+
+}
+.theme-switch input {
+  display:none;
+}
+
+.slider {
+  background-color: #ccc;
+  bottom: 0;
+  cursor: pointer;
+  left: 0;
+  position: absolute;
+  right: 0;
+  top: 0;
+  transition: .4s;
+}
+
+.slider:before {
+  background-color: #fff;
+  bottom: 4px;
+  content: "";
+  height: 26px;
+  left: 4px;
+  position: absolute;
+  transition: .4s;
+  width: 26px;
+}
+
+input:checked + .slider {
+  background-color: #66bb6a;
+}
+
+input:checked + .slider:before {
+  transform: translateX(26px);
+}
+
+.slider.round {
+  border-radius: 34px;
+}
+
+.slider.round:before {
+  border-radius: 50%;
 }
 .page-top .information {
   float: right;
@@ -205,7 +279,7 @@
   width: 40%;
   -webkit-background-size: cover;
   background-size: cover;
-  background-color: #fff;
+  background-color: var(--secondary-bg-color);
   height: 100%;
   transition: 0.8s;
   top: 0;
@@ -265,7 +339,7 @@
 }
 
 .post {
-  background-color: #FFF;
+  background-color: var(--bg-color);
   margin: 30px;
 }
 .post .post-title h1 {
@@ -280,21 +354,22 @@
   font-size: 28px;
   line-height: 1;
   font-weight: 600;
-  color: #5f5f5f;
+  color: var(--heading-color);
 }
 .post .post-title h3 {
   text-transform: uppercase;
   letter-spacing: 1px;
   line-height: 1;
   font-weight: 600;
-  color: #464646;
+  /* color: #464646; */
+  color: var(--heading-color);
   font-size: 22px;
   margin: 0;
 }
 .post .post-title a {
   text-decoration: none;
   letter-spacing: 1px;
-  color: #5f5f5f;
+  color: var(--heading-color);
 }
 .post .post-title a:hover {
   text-decoration: underline;
@@ -308,12 +383,12 @@
   color: #2F69B3;
 }
 .post .post-content h3 {
-  color: #5F5F5F;
+  /*  */
   font-size: 22px;
   font-weight: 600;
 }
 .post .post-content h4 {
-  color: #5F5F5F;
+  /* color: var(--heading-color); */
   font-size: 16px;
 }
 .post .post-content img {
@@ -371,7 +446,7 @@
 }
 .post .post-footer .tags a {
   text-decoration: none;
-  color: rgba(0, 0, 0, 0.44);
+  color: var(--post-color);
   font-weight: 400;
 }
 .post .post-footer .tags a:hover {
@@ -396,7 +471,7 @@
 }
 .pagination ul li a {
   text-decoration: none;
-  color: rgba(0, 0, 0, 0.5);
+  color: var(--body-color);
 }
 .pagination .pre {
   float: left;
@@ -439,7 +514,7 @@
   position: absolute;
   width: 100%;
   padding-bottom: 20px;
-  background: #fff;
+  background: red;
 }
 .footer a {
   color: #A6A6A6;
@@ -592,13 +667,13 @@
   display: inline-block;
   position: relative;
   outline: 0;
-  color: rgba(0, 0, 0, 0.44);
+  color: var(--post-color);
   background: transparent;
   font-size: 14px;
   text-align: center;
   text-decoration: none;
   cursor: pointer;
-  border: 1px solid rgba(0, 0, 0, 0.15);
+  border: 1px solid var(--border-color);
   white-space: nowrap;
   font-weight: 400;
   font-style: normal;
@@ -658,13 +733,13 @@
   position: relative;
   padding: 0.5em 1.25em;
   outline: 0;
-  color: rgba(0, 0, 0, 0.44);
+  color: var(--post-color);
   background: transparent;
   font-size: 14px;
   text-align: center;
   text-decoration: none;
   cursor: pointer;
-  border: 1px solid rgba(0, 0, 0, 0.15);
+  border: 1px solid var(--border-color);
   white-space: nowrap;
   font-weight: 400;
   font-style: normal;
diff --git a/layouts/partials/footer.html b/layouts/partials/footer.html
index 7a49578..64dce74 100644
--- a/layouts/partials/footer.html
+++ b/layouts/partials/footer.html
@@ -12,4 +12,30 @@
 {{- partial "medium-zoom.html" . -}}
 {{- partial "math.html" . -}}
 {{- template "_internal/google_analytics_async.html" . -}}
+
+<script type="text/javascript" >
+const toggleSwitch = document.querySelector('.theme-switch input[type="checkbox"]');
+
+function switchTheme(e) {
+    if (e.target.checked) {
+        document.documentElement.setAttribute('data-theme', 'dark');
+        localStorage.setItem('theme', 'dark');
+    }
+    else {
+        document.documentElement.setAttribute('data-theme', 'light');
+        localStorage.setItem('theme', 'light');
+    }    
+}
+
+toggleSwitch.addEventListener('change', switchTheme, false);
+const currentTheme = localStorage.getItem('theme') ? localStorage.getItem('theme') : null;
+
+if (currentTheme) {
+    document.documentElement.setAttribute('data-theme', currentTheme);
+
+    if (currentTheme === 'dark') {
+        toggleSwitch.checked = true;
+    }
+}
+</script>
 </html>
\ No newline at end of file
diff --git a/layouts/partials/head.html b/layouts/partials/head.html
index de15d56..e04cd6e 100644
--- a/layouts/partials/head.html
+++ b/layouts/partials/head.html
@@ -1,3 +1,4 @@
+<html lang="en" data-theme="light">
 <head>
     <title> {{.Site.Params.author}}{{ with .Title }} | {{ . }}{{ end }} </title>
     <meta charset="utf-8">
diff --git a/layouts/partials/navbar.html b/layouts/partials/navbar.html
index 90dd290..0fcaeee 100644
--- a/layouts/partials/navbar.html
+++ b/layouts/partials/navbar.html
@@ -5,5 +5,12 @@
         <li><a {{if or ($currentPage.IsMenuCurrent "main" .) ($currentPage.HasMenuCurrent "main" .) }}class="current"{{end}} href="{{ .URL }}" title="{{ .Title }}">{{ .Name }}</a></li>
 
         {{ end }}
+        <div class="theme-switch-wrapper">
+            <label class="theme-switch" for="checkbox">
+                <input type="checkbox" id="checkbox" />
+                <div class="slider round"></div>
+          </label>
+          
+        </div>
     </div>
 </div>
\ No newline at end of file

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