rustdoc: clean up source sidebar hide button

This is a redesign of the feature, with parts pulled from
https://github.com/rust-lang/rust/pull/119049
but with a button that looks more like a button and matches the
one used on other sidebar pages.

4 files changed, 73 insertions, 142 deletions

diff --git a/src/librustdoc/html/static/css/rustdoc.css b/src/librustdoc/html/static/css/rustdoc.css
index 6e673aa77c5..0d59d81f62d 100644
--- a/src/librustdoc/html/static/css/rustdoc.css
+++ b/src/librustdoc/html/static/css/rustdoc.css
@@ -366,22 +366,12 @@ img {
 	max-width: 100%;
 }
 
-.sub-logo-container, .logo-container {
+.logo-container {
 	/* zero text boxes so that computed line height = image height exactly */
 	line-height: 0;
 	display: block;
 }
 
-.sub-logo-container {
-	margin-right: 32px;
-}
-
-.sub-logo-container > img {
-	height: 60px;
-	width: 60px;
-	object-fit: contain;
-}
-
 .rust-logo {
 	filter: var(--rust-logo-filter);
 }
@@ -424,14 +414,14 @@ img {
 }
 
 .rustdoc.src .sidebar-resizer {
-	/* when closed, place resizer glow on top of the normal src sidebar border (no need to worry
-	   about sidebar) */
-	left: 49px;
+	/* src pages have separate closed flag */
+	display: none;
 }
 
-.src-sidebar-expanded .rustdoc.src .sidebar-resizer {
+.src-sidebar-expanded .src .sidebar-resizer {
 	/* for src sidebar, gap is already provided by 1px border on sidebar itself, so place resizer
 	   to right of it */
+	display: block;
 	left: var(--src-sidebar-width);
 }
 
@@ -447,7 +437,7 @@ img {
 }
 
 .sidebar-resizing .sidebar {
-	position: fixed;
+	position: fixed !important;
 	z-index: 100;
 }
 .sidebar-resizing > body {
@@ -497,28 +487,25 @@ img {
 }
 
 .sidebar, .mobile-topbar, .sidebar-menu-toggle,
-#src-sidebar-toggle, #src-sidebar {
+#src-sidebar {
 	background-color: var(--sidebar-background-color);
 }
 
-#src-sidebar-toggle > button:hover, #src-sidebar-toggle > button:focus {
-	background-color: var(--sidebar-background-color-hover);
-}
-
-.src .sidebar > *:not(#src-sidebar-toggle) {
-	visibility: hidden;
+.src .sidebar {
+	position: absolute;
+	top: 0;
+	bottom: 0;
+	left: -1000px;
 }
 
 .src-sidebar-expanded .src .sidebar {
+	position: sticky;
+	left: 0;
 	overflow-y: auto;
 	flex-basis: var(--src-sidebar-width);
 	width: var(--src-sidebar-width);
 }
 
-.src-sidebar-expanded .src .sidebar > *:not(#src-sidebar-toggle) {
-	visibility: visible;
-}
-
 #all-types {
 	margin-top: 1em;
 }
@@ -1528,18 +1515,6 @@ a.tooltip:hover::after {
 	font-weight: normal;
 }
 
-#src-sidebar-toggle {
-	position: sticky;
-	top: 0;
-	left: 0;
-	font-size: 1.25rem;
-	border-bottom: 1px solid;
-	display: flex;
-	height: 40px;
-	justify-content: stretch;
-	align-items: stretch;
-	z-index: 10;
-}
 #src-sidebar {
 	width: 100%;
 	overflow: auto;
@@ -1557,18 +1532,14 @@ a.tooltip:hover::after {
 #src-sidebar div.files > a.selected {
 	background-color: var(--src-sidebar-background-selected);
 }
-#src-sidebar-toggle > button {
-	font-size: inherit;
-	font-weight: bold;
-	background: none;
-	color: inherit;
-	text-align: center;
-	border: none;
-	outline: none;
-	flex: 1 1;
-	/* iOS button gradient: https://stackoverflow.com/q/5438567 */
-	-webkit-appearance: none;
-	opacity: 1;
+
+.src-sidebar-title {
+	position: sticky;
+	top: 0;
+	display: flex;
+	padding: 8px;
+	padding-left: 48px;
+	background: var(--sidebar-background-color);
 }
 
 #settings-menu, #help-button {
@@ -1578,7 +1549,8 @@ a.tooltip:hover::after {
 #sidebar-button {
 	display: none;
 }
-.hide-sidebar #sidebar-button {
+.hide-sidebar #sidebar-button,
+.src #sidebar-button {
 	display: flex;
 	margin-right: 4px;
 	position: fixed;
@@ -1588,6 +1560,16 @@ a.tooltip:hover::after {
 	background-color: var(--main-background-color);
 	z-index: 1;
 }
+.src #sidebar-button {
+	left: 12px;
+	z-index: 101;
+}
+.src .search-form {
+	margin-left: 40px;
+}
+.src-sidebar-expanded .src .search-form {
+	margin-left: 0;
+}
 #settings-menu > a, #help-button > a, #sidebar-button > a {
 	display: flex;
 	align-items: center;
@@ -1843,10 +1825,6 @@ in src-script.js and main.js
 		scroll-margin-top: 45px;
 	}
 
-	.hide-sidebar #sidebar-button {
-		position: static;
-	}
-
 	.rustdoc {
 		/* Sidebar should overlay main content, rather than pushing main content to the right.
 		   Turn off `display: flex` on the body element. */
@@ -1974,31 +1952,6 @@ in src-script.js and main.js
 		left: -11px;
 	}
 
-	#src-sidebar-toggle {
-		position: fixed;
-		left: 1px;
-		top: 100px;
-		width: 30px;
-		font-size: 1.5rem;
-		padding: 0;
-		z-index: 10;
-		border-top-right-radius: 3px;
-		border-bottom-right-radius: 3px;
-		border: 1px solid;
-		border-left: 0;
-	}
-
-	.src-sidebar-expanded #src-sidebar-toggle {
-		left: unset;
-		top: unset;
-		width: unset;
-		border-top-right-radius: unset;
-		border-bottom-right-radius: unset;
-		position: sticky;
-		border: 0;
-		border-bottom: 1px solid;
-	}
-
 	/* We don't display these buttons on mobile devices. */
 	#copy-path, #help-button {
 		display: none;
@@ -2015,6 +1968,14 @@ in src-script.js and main.js
 		height: 22px;
 	}
 
+	/* src sidebar button opens modal
+		use hamburger button */
+	.src #sidebar-button > a:before {
+		content: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" \
+			viewBox="0 0 22 22" fill="none" stroke="black">\
+			<path d="M3,5h16M3,11h16M3,17h16" stroke-width="3"/></svg>');
+	}
+
 	/* Display an alternating layout on tablets and phones */
 	.item-table, .item-row, .item-table > li, .item-table > li > div,
 	.search-results > a, .search-results > a > div {
@@ -2040,9 +2001,19 @@ in src-script.js and main.js
 	}
 
 	.src-sidebar-expanded .src .sidebar {
+		position: fixed;
 		max-width: 100vw;
 		width: 100vw;
 	}
+	.src .src-sidebar-title {
+		padding-top: 0;
+	}
+	.hide-sidebar #sidebar-button {
+		position: static;
+	}
+	.src #sidebar-button {
+		position: fixed;
+	}
 
 	/* Position of the "[-]" element. */
 	details.toggle:not(.top-doc) > summary {
@@ -2114,12 +2085,6 @@ in src-script.js and main.js
 	.search-form {
 		align-self: stretch;
 	}
-
-	.sub-logo-container > img {
-		height: 35px;
-		width: 35px;
-		margin-bottom: var(--nav-sub-mobile-padding);
-	}
 }
 
 .variant,
diff --git a/src/librustdoc/html/static/js/main.js b/src/librustdoc/html/static/js/main.js
index 63ab56053af..410bf2e34ca 100644
--- a/src/librustdoc/html/static/js/main.js
+++ b/src/librustdoc/html/static/js/main.js
@@ -1519,11 +1519,18 @@ href="https://doc.rust-lang.org/${channel}/rustdoc/read-documentation/search.htm
     // and it can be activated by resizing the sidebar into nothing.
     const sidebarButton = document.getElementById("sidebar-button");
     if (sidebarButton) {
-        sidebarButton.addEventListener("click", e => {
-            removeClass(document.documentElement, "hide-sidebar");
-            updateLocalStorage("hide-sidebar", "false");
-            e.preventDefault();
-        });
+        if (document.querySelector(".rustdoc.src")) {
+            sidebarButton.addEventListener("click", e => {
+                window.rustdocToggleSrcSidebar();
+                e.preventDefault();
+            });
+        } else {
+            sidebarButton.addEventListener("click", e => {
+                removeClass(document.documentElement, "hide-sidebar");
+                updateLocalStorage("hide-sidebar", "false");
+                e.preventDefault();
+            });
+        }
     }
 
     // Pointer capture.
@@ -1646,7 +1653,7 @@ href="https://doc.rust-lang.org/${channel}/rustdoc/read-documentation/search.htm
             return;
         }
         e.preventDefault();
-        const pos = e.clientX - sidebar.offsetLeft - 3;
+        const pos = e.clientX - 3;
         if (pos < SIDEBAR_VANISH_THRESHOLD) {
             hideSidebar();
         } else if (pos >= SIDEBAR_MIN) {
diff --git a/src/librustdoc/html/static/js/src-script.js b/src/librustdoc/html/static/js/src-script.js
index fc1d2d37845..2a3a6e7afb3 100644
--- a/src/librustdoc/html/static/js/src-script.js
+++ b/src/librustdoc/html/static/js/src-script.js
@@ -71,68 +71,34 @@ function createDirEntry(elem, parent, fullPath, hasFoundFile) {
     return hasFoundFile;
 }
 
-let toggleLabel;
-
-function getToggleLabel() {
-    toggleLabel = toggleLabel || document.querySelector("#src-sidebar-toggle button");
-    return toggleLabel;
-}
-
 window.rustdocCloseSourceSidebar = () => {
     removeClass(document.documentElement, "src-sidebar-expanded");
-    getToggleLabel().innerText = ">";
     updateLocalStorage("source-sidebar-show", "false");
 };
 
 window.rustdocShowSourceSidebar = () => {
     addClass(document.documentElement, "src-sidebar-expanded");
-    getToggleLabel().innerText = "<";
     updateLocalStorage("source-sidebar-show", "true");
 };
 
-function toggleSidebar() {
-    const child = this.parentNode.children[0];
-    if (child.innerText === ">") {
-        window.rustdocShowSourceSidebar();
-    } else {
+window.rustdocToggleSrcSidebar = () => {
+    if (document.documentElement.classList.contains("src-sidebar-expanded")) {
         window.rustdocCloseSourceSidebar();
-    }
-}
-
-function createSidebarToggle() {
-    const sidebarToggle = document.createElement("div");
-    sidebarToggle.id = "src-sidebar-toggle";
-
-    const inner = document.createElement("button");
-
-    if (getCurrentValue("source-sidebar-show") === "true") {
-        inner.innerText = "<";
     } else {
-        inner.innerText = ">";
+        window.rustdocShowSourceSidebar();
     }
-    inner.onclick = toggleSidebar;
-
-    sidebarToggle.appendChild(inner);
-    return sidebarToggle;
-}
+};
 
 // This function is called from "src-files.js", generated in `html/render/write_shared.rs`.
 // eslint-disable-next-line no-unused-vars
 function createSrcSidebar() {
     const container = document.querySelector("nav.sidebar");
 
-    const sidebarToggle = createSidebarToggle();
-    container.insertBefore(sidebarToggle, container.firstChild);
-
     const sidebar = document.createElement("div");
     sidebar.id = "src-sidebar";
 
     let hasFoundFile = false;
 
-    const title = document.createElement("div");
-    title.className = "title";
-    title.innerText = "Files";
-    sidebar.appendChild(title);
     for (const [key, source] of srcIndex) {
         source[NAME_OFFSET] = key;
         hasFoundFile = createDirEntry(source, sidebar, "", hasFoundFile);
diff --git a/src/librustdoc/html/templates/page.html b/src/librustdoc/html/templates/page.html
index 60ca5660c02..c4d8796623d 100644
--- a/src/librustdoc/html/templates/page.html
+++ b/src/librustdoc/html/templates/page.html
@@ -111,6 +111,10 @@
         {% if !display_krate_version_extra.is_empty() %}
         <div class="version">{{+ display_krate_version_extra}}</div> {# #}
         {% endif %}
+        {% else %}
+        <div class="src-sidebar-title">
+            <h2>Files</h2> {# #}
+        </div> {# #}
         {% endif %}
         {{ sidebar|safe }}
     </nav> {# #}
@@ -118,22 +122,11 @@
     <main> {# #}
         {% if page.css_class != "src" %}<div class="width-limiter">{% endif %}
             <nav class="sub"> {# #}
-                {% if page.css_class == "src" && (!layout.logo.is_empty() || page.rust_logo) %}
-                <a class="sub-logo-container" href="{{page.root_path|safe}}{{display_krate_with_trailing_slash|safe}}index.html"> {# #}
-                    {% if page.rust_logo %}
-                    <img class="rust-logo" src="{{static_root_path|safe}}{{files.rust_logo_svg}}" alt="{{display_krate}}"> {# #}
-                    {% else if !layout.logo.is_empty() %}
-                        <img src="{{layout.logo}}" alt="{{display_krate}}"> {# #}
-                    {% endif %}
-                </a> {# #}
-                {% endif %}
                 <form class="search-form"> {# #}
                     <span></span> {# This empty span is a hacky fix for Safari - See #93184 #}
-                    {% if page.css_class != "src" %}
                     <div id="sidebar-button" tabindex="-1"> {# #}
                         <a href="{{page.root_path|safe}}{{layout.krate|safe}}/all.html" title="show sidebar"></a> {# #}
                     </div> {# #}
-                    {% endif %}
                     <input {#+ #}
                         class="search-input" {#+ #}
                         name="search" {#+ #}