add tooltip to icons (rust-lang#477)

add tooltip to icons and previous/next chapter links

Author: mockersf

src/theme/book.js

@@ -186,15 +186,17 @@ $( document ).ready(function() {
         if(!lines_hidden) { return; }
 
         // add expand button
-        pre_block.prepend("<div class=\"buttons\"><i class=\"fa fa-expand\"></i></div>");
+        pre_block.prepend("<div class=\"buttons\"><i class=\"fa fa-expand\" title=\"Show hidden lines\"></i></div>");
 
         pre_block.find("i").click(function(e){
             if( $(this).hasClass("fa-expand") ) {
                 $(this).removeClass("fa-expand").addClass("fa-compress");
+                $(this).attr("title", "Hide lines");
                 pre_block.find("span.hidden").removeClass("hidden").addClass("unhidden");
             }
             else {
                 $(this).removeClass("fa-compress").addClass("fa-expand");
+                $(this).attr("title", "Show hidden lines");
                 pre_block.find("span.unhidden").removeClass("unhidden").addClass("hidden");
             }
         });
@@ -209,12 +211,12 @@ $( document ).ready(function() {
             pre_block.prepend("<div class=\"buttons\"></div>");
             buttons = pre_block.find(".buttons");
         }
-        buttons.prepend("<i class=\"fa fa-play play-button hidden\"></i>");
-        buttons.prepend("<i class=\"fa fa-copy clip-button\"><i class=\"tooltiptext\"></i></i>");
+        buttons.prepend("<i class=\"fa fa-play play-button hidden\" title=\"Run this code\"></i>");
+        buttons.prepend("<i class=\"fa fa-copy clip-button\" title=\"Copy to clipboard\"><i class=\"tooltiptext\"></i></i>");
 
         let code_block = pre_block.find("code").first();
         if (window.ace && code_block.hasClass("editable")) {
-            buttons.prepend("<i class=\"fa fa-history reset-button\"></i>");
+            buttons.prepend("<i class=\"fa fa-history reset-button\" title=\"Undo changes\"></i>");
         }
 
         buttons.find(".play-button").click(function(e){

src/theme/index.hbs

@@ -76,8 +76,8 @@
             <div class="page" tabindex="-1">
                 <div id="menu-bar" class="menu-bar">
                     <div class="left-buttons">
-                        <i id="sidebar-toggle" class="fa fa-bars"></i>
-                        <i id="theme-toggle" class="fa fa-paint-brush"></i>
+                        <i id="sidebar-toggle" class="fa fa-bars" title="Toggle sidebar"></i>
+                        <i id="theme-toggle" class="fa fa-paint-brush" title="Change theme"></i>
                     </div>
 
                     <h1 class="menu-title">{{ book_title }}</h1>
@@ -95,13 +95,13 @@
 
                 <!-- Mobile navigation buttons -->
                 {{#previous}}
-                    <a rel="prev" href="{{link}}" class="mobile-nav-chapters previous">
+                    <a rel="prev" href="{{link}}" class="mobile-nav-chapters previous" title="Previous chapter">
                         <i class="fa fa-angle-left"></i>
                     </a>
                 {{/previous}}
 
                 {{#next}}
-                    <a rel="next" href="{{link}}" class="mobile-nav-chapters next">
+                    <a rel="next" href="{{link}}" class="mobile-nav-chapters next" title="Next chapter">
                         <i class="fa fa-angle-right"></i>
                     </a>
                 {{/next}}