Improve settings menu display

src/librustdoc/html/static/css/rustdoc.css

@@ -1404,6 +1404,15 @@ pre.rust {
 	border-radius: 2px;
 	cursor: pointer;
 }
+#settings-menu {
+	padding: 0;
+}
+#settings-menu > a {
+	padding: 5px;
+	width: 100%;
+	height: 100%;
+	display: block;
+}
 
 @keyframes rotating {
 	from {
@@ -1416,6 +1425,30 @@ pre.rust {
 #settings-menu.rotate img {
 	animation: rotating 2s linear infinite;
 }
+#settings-menu #settings {
+	position: absolute;
+	right: 0;
+	z-index: 1;
+	display: block;
+	margin-top: 7px;
+	border-radius: 3px;
+	border: 1px solid;
+}
+#settings-menu #settings .setting-line {
+	margin: 0.6em;
+}
+/* This rule is to draw the little arrow connecting the settings menu to the gear icon. */
+#settings-menu #settings::before {
+	content: '';
+	position: absolute;
+	right: 11px;
+	border: solid;
+	border-width: 1px 1px 0 0;
+	display: inline-block;
+	padding: 4px;
+	transform: rotate(-45deg);
+	top: -5px;
+}
 
 #help-button {
 	font-family: "Fira Sans", Arial, sans-serif;

src/librustdoc/html/static/css/themes/ayu.css

@@ -5,7 +5,7 @@ Original by Dempfi (https://github.com/dempfi/ayu)
 
 /* General structure and fonts */
 
-body {
+body, #settings-menu #settings, #settings-menu #settings::before {
 	background-color: #0f1419;
 	color: #c5c5c5;
 }
@@ -541,6 +541,10 @@ kbd {
 	filter: invert(100);
 }
 
+#settings-menu #settings, #settings-menu #settings::before {
+	border-color: #5c6773;
+}
+
 #copy-path {
 	color: #fff;
 }

src/librustdoc/html/static/css/themes/dark.css

@@ -1,4 +1,4 @@
-body {
+body, #settings-menu #settings, #settings-menu #settings::before {
 	background-color: #353535;
 	color: #ddd;
 }
@@ -420,6 +420,10 @@ kbd {
 	border-color: #ffb900;
 }
 
+#settings-menu #settings, #settings-menu #settings::before {
+	border-color: #d2d2d2;
+}
+
 #copy-path {
 	color: #999;
 }

src/librustdoc/html/static/css/themes/light.css

@@ -1,6 +1,6 @@
 /* General structure and fonts */
 
-body {
+body, #settings-menu #settings, #settings-menu #settings::before {
 	background-color: white;
 	color: black;
 }
@@ -405,6 +405,10 @@ kbd {
 	border-color: #717171;
 }
 
+#settings-menu #settings, #settings-menu #settings::before {
+	border-color: #DDDDDD;
+}
+
 #copy-path {
 	color: #999;
 }

src/librustdoc/html/static/js/settings.js

@@ -1,7 +1,7 @@
 // Local js definitions:
 /* global getSettingValue, getVirtualKey, updateLocalStorage, updateSystemTheme */
-/* global addClass, removeClass, onEach, onEachLazy, NOT_DISPLAYED_ID */
+/* global addClass, removeClass, onEach, onEachLazy */
-/* global MAIN_ID, getVar, getSettingsButton, switchDisplayedElement, getNotDisplayedElem */
+/* global MAIN_ID, getVar, getSettingsButton */
 
 "use strict";
 
@@ -206,38 +206,60 @@
         ];
 
         // Then we build the DOM.
-        const el = document.createElement("section");
+        let innerHTML = "";
-        el.id = "settings";
+        let elementKind = "div";
-        let innerHTML = `
+
-            <div class="main-heading">
+        if (isSettingsPage) {
+            elementKind = "section";
+            innerHTML = `<div class="main-heading">
                 <h1 class="fqn">
                     <span class="in-band">Rustdoc settings</span>
                 </h1>
-                <span class="out-of-band">`;
+                <span class="out-of-band">
-
+                    <a id="back" href="javascript:void(0)" onclick="history.back();">Back</a>
-        if (isSettingsPage) {
+                </span>
-            innerHTML +=
+                </div>`;
-                "<a id=\"back\" href=\"javascript:void(0)\" onclick=\"history.back();\">Back</a>";
-        } else {
-            innerHTML += "<a id=\"back\" href=\"javascript:void(0)\" " +
-                "onclick=\"switchDisplayedElement(null);\">Back</a>";
         }
-        innerHTML += `</span>
+        innerHTML += `<div class="settings">${buildSettingsPageSections(settings)}</div>`;
-            </div>
-            <div class="settings">${buildSettingsPageSections(settings)}</div>`;
 
+        const el = document.createElement(elementKind);
+        el.id = "settings";
         el.innerHTML = innerHTML;
 
         if (isSettingsPage) {
             document.getElementById(MAIN_ID).appendChild(el);
         } else {
-            getNotDisplayedElem().appendChild(el);
+            el.setAttribute("tabindex", "-1");
+            getSettingsButton().appendChild(el);
         }
         return el;
     }
 
     const settingsMenu = buildSettingsPage();
 
+    function displaySettings() {
+        settingsMenu.style.display = "";
+    }
+
+    function elemIsInParent(elem, parent) {
+        while (elem && elem !== document.body) {
+            if (elem === parent) {
+                return true;
+            }
+            elem = elem.parentElement;
+        }
+        return false;
+    }
+
+    function blurHandler(event) {
+        const settingsButton = getSettingsButton();
+        if (!elemIsInParent(document.activeElement, settingsButton) &&
+            !elemIsInParent(event.relatedTarget, settingsButton))
+        {
+            window.hideSettings();
+        }
+    }
+
     if (isSettingsPage) {
         // We replace the existing "onclick" callback to do nothing if clicked.
         getSettingsButton().onclick = function(event) {
@@ -246,17 +268,27 @@
     } else {
         // We replace the existing "onclick" callback.
         const settingsButton = getSettingsButton();
+        const settingsMenu = document.getElementById("settings");
+        window.hideSettings = function() {
+            settingsMenu.style.display = "none";
+        };
         settingsButton.onclick = function(event) {
+            if (elemIsInParent(event.target, settingsMenu)) {
+                return;
+            }
             event.preventDefault();
-            if (settingsMenu.parentElement.id === NOT_DISPLAYED_ID) {
+            if (settingsMenu.style.display !== "none") {
-                switchDisplayedElement(settingsMenu);
-            } else {
                 window.hideSettings();
+            } else {
+                displaySettings();
             }
         };
-        window.hideSettings = function() {
+        settingsButton.onblur = blurHandler;
-            switchDisplayedElement(null);
+        settingsButton.querySelector("a").onblur = blurHandler;
-        };
+        onEachLazy(settingsMenu.querySelectorAll("input"), el => {
+            el.onblur = blurHandler;
+        });
+        settingsMenu.onblur = blurHandler;
     }
 
     // We now wait a bit for the web browser to end re-computing the DOM...
@@ -264,7 +296,7 @@
         setEvents(settingsMenu);
         // The setting menu is already displayed if we're on the settings page.
         if (!isSettingsPage) {
-            switchDisplayedElement(settingsMenu);
+            displaySettings();
         }
         removeClass(getSettingsButton(), "rotate");
     }, 0);

src/librustdoc/html/templates/page.html

@@ -126,10 +126,12 @@
                                 placeholder="Click or press ‘S’ to search, ‘?’ for more options…" {# -#}
                                 type="search"> {#- -#}
                             <button type="button" id="help-button" title="help">?</button> {#- -#}
-                            <a id="settings-menu" href="{{page.root_path|safe}}settings.html" title="settings"> {#- -#}
+                            <div id="settings-menu" tabindex="-1">
-                                <img width="22" height="22" alt="Change settings" {# -#}
+                                <a href="{{page.root_path|safe}}settings.html" title="settings"> {#- -#}
+                                    <img width="22" height="22" alt="Change settings" {# -#}
                                      src="{{static_root_path|safe}}wheel{{page.resource_suffix}}.svg"> {#- -#}
-                            </a> {#- -#}
+                                </a> {#- -#}
+                            </div>
                         </div> {#- -#}
                     </form> {#- -#}
                 </nav> {#- -#}