Improved tooltips

scripts/AnimeNotifier.ts

@@ -14,6 +14,7 @@ import ServerEvents from "./ServerEvents"
 import { displayAiringDate, displayDate, displayTime } from "./DateView"
 import { findAll, supportsWebP, requestIdleCallback, swapElements, delay, findAllInside } from "./Utils"
 import * as actions from "./Actions"
+import ToolTip from "./Elements/tool-tip/tool-tip"
 
 export default class AnimeNotifier {
 	app: Application
@@ -39,6 +40,7 @@ export default class AnimeNotifier {
 	lastReloadContentPath: string
 	currentMediaId: string
 	serverEvents: ServerEvents
+	tip: ToolTip
 
 	constructor(app: Application) {
 		this.app = app
@@ -53,31 +55,6 @@ export default class AnimeNotifier {
 
 		// Never remove src property on diffs
 		Diff.persistentAttributes.add("src")
-
-		// Is intersection observer supported?
-		if("IntersectionObserver" in window) {
-			// Enable lazy load
-			this.visibilityObserver = new IntersectionObserver(
-				entries => {
-					for(let entry of entries) {
-						if(entry.isIntersecting) {
-							entry.target["became visible"]()
-							this.visibilityObserver.unobserve(entry.target)
-						}
-					}
-				},
-				{}
-			)
-		} else {
-			// Disable lazy load feature
-			this.visibilityObserver = {
-				disconnect: () => {},
-				observe: (elem: HTMLElement) => {
-					elem["became visible"]()
-				},
-				unobserve: (_: HTMLElement) => {}
-			} as IntersectionObserver
-		}
 	}
 
 	init() {
@@ -124,6 +101,39 @@ export default class AnimeNotifier {
 			}
 		}
 
+		// Web components
+		this.registerWebComponents()
+
+		// Tooltip
+		this.tip = new ToolTip()
+		document.body.appendChild(this.tip)
+		document.addEventListener("linkclicked", () => this.tip.classList.add("fade-out"))
+
+		// Intersection observer
+		if("IntersectionObserver" in window) {
+			// Enable lazy load
+			this.visibilityObserver = new IntersectionObserver(
+				entries => {
+					for(let entry of entries) {
+						if(entry.isIntersecting) {
+							entry.target["became visible"]()
+							this.visibilityObserver.unobserve(entry.target)
+						}
+					}
+				},
+				{}
+			)
+		} else {
+			// Disable lazy load feature
+			this.visibilityObserver = {
+				disconnect: () => {},
+				observe: (elem: HTMLElement) => {
+					elem["became visible"]()
+				},
+				unobserve: (_: HTMLElement) => {}
+			} as IntersectionObserver
+		}
+
 		// Status message
 		this.statusMessage = new StatusMessage(
 			document.getElementById("status-message") as HTMLElement,
@@ -183,7 +193,7 @@ export default class AnimeNotifier {
 			Promise.resolve().then(() => this.dragAndDrop()),
 			Promise.resolve().then(() => this.colorBoxes()),
 			Promise.resolve().then(() => this.loadCharacterRanking()),
-			Promise.resolve().then(() => this.assignTooltipOffsets()),
+			Promise.resolve().then(() => this.prepareTooltips()),
 			Promise.resolve().then(() => this.countUp())
 		])
 
@@ -200,6 +210,23 @@ export default class AnimeNotifier {
 		}
 	}
 
+	registerWebComponents() {
+		if(!("customElements" in window)) {
+			console.warn("Web components not supported in your current browser")
+			return
+		}
+
+		// Custom element names must have a dash in their name
+		const elements = new Map<string, Function>([
+			["tool-tip", ToolTip]
+		])
+
+		// Register all custom elements
+		for(const [tag, definition] of elements.entries()) {
+			window.customElements.define(tag, definition)
+		}
+	}
+
 	applyPageTitle() {
 		let headers = document.getElementsByTagName("h1")
 
@@ -313,80 +340,24 @@ export default class AnimeNotifier {
 		}
 	}
 
-	assignTooltipOffsets(elements?: IterableIterator<HTMLElement>) {
+	prepareTooltips(elements?: IterableIterator<HTMLElement>) {
-		requestIdleCallback(() => {
+		if(!elements) {
-			const distanceToBorder = 5
+			elements = findAll("tip")
-			let contentRect: ClientRect
+		}
 
-			if(!elements) {
+		this.tip.setAttribute("active", "false")
-				elements = findAll("tip")
+
+		// Assign mouse enter event handler
+		for(let element of elements) {
+			element.onmouseenter = () => {
+				this.tip.classList.remove("fade-out")
+				this.tip.show(element)
 			}
 
-			// Assign mouse enter event handler
+			element.onmouseleave = () => {
-			for(let element of elements) {
+				this.tip.hide()
-				Diff.mutations.queue(() => {
-					element.classList.add("tip-active")
-				})
-
-				element.onmouseenter = () => {
-					Diff.mutations.queue(() => {
-						if(!contentRect) {
-							contentRect = this.app.content.getBoundingClientRect()
-						}
-
-						// Dynamic label assignment to prevent label texts overflowing
-						// and taking horizontal space at page load.
-						let label = element.getAttribute("aria-label")
-
-						if(!label) {
-							console.error("Tooltip without a label:", element)
-							return
-						}
-
-						element.dataset.label = label
-
-						// This is the most expensive call in this whole function,
-						// it consumes about 2-4 ms every time you call it.
-						let rect = element.getBoundingClientRect()
-
-						// Calculate offsets
-						let tipStyle = window.getComputedStyle(element, ":before")
-
-						if(!tipStyle.width || !tipStyle.paddingLeft) {
-							console.error("Tooltip with incorrect computed style:", element)
-							return
-						}
-
-						let tipWidth = parseInt(tipStyle.width) + parseInt(tipStyle.paddingLeft) * 2
-						let tipStartX = rect.left + rect.width / 2 - tipWidth / 2 - contentRect.left
-						let tipEndX = tipStartX + tipWidth
-						let leftOffset = 0
-
-						if(tipStartX < distanceToBorder) {
-							leftOffset = -tipStartX + distanceToBorder
-						} else if(tipEndX > contentRect.width - distanceToBorder) {
-							leftOffset = -(tipEndX - contentRect.width + distanceToBorder)
-						}
-
-						if(leftOffset !== 0) {
-							element.classList.remove("tip-active")
-							element.classList.add("tip-offset-root")
-
-							let tipChild = document.createElement("div")
-							tipChild.classList.add("tip-offset-child")
-							tipChild.setAttribute("data-label", element.dataset.label)
-							tipChild.style.left = Math.round(leftOffset) + "px"
-							tipChild.style.width = rect.width + "px"
-							tipChild.style.height = rect.height + "px"
-							element.appendChild(tipChild)
-						}
-
-						// Unassign event listener
-						element.onmouseenter = null
-					})
-				}
 			}
-		})
+		}
 	}
 
 	dragAndDrop() {
@@ -1272,7 +1243,7 @@ export default class AnimeNotifier {
 		this.app.ajaxify(element.getElementsByTagName("a"))
 		this.lazyLoad(findAllInside("lazy", element))
 		this.mountMountables(findAllInside("mountable", element))
-		this.assignTooltipOffsets(findAllInside("tip", element))
+		this.prepareTooltips(findAllInside("tip", element))
 		this.textAreaFocus()
 	}
 

scripts/Application.ts

@@ -237,6 +237,7 @@ export default class Application {
 
 				e.preventDefault()
 
+				// Prevent loading the same page
 				let url = (this as HTMLAnchorElement).getAttribute("href")
 
 				if(!url || url === self.currentPath) {
@@ -245,6 +246,7 @@ export default class Application {
 
 				// Load requested page
 				self.load(url)
+				self.emit("linkclicked")
 			}
 		}
 	}

scripts/Elements/tool-tip/tool-tip.scarlet

@@ -0,0 +1,38 @@
+const tip-opacity = 1
+const tip-transform-hidden = translateY(20%)
+const tip-transform-visible = translateY(0)
+const tip-offset = -0.6rem
+
+tool-tip
+	position absolute
+	z-index 100000
+	opacity 0
+	transform tip-transform-hidden
+	transition opacity transition-speed ease, transform transition-speed ease
+	pointer-events none
+	margin-top tip-offset
+
+	[active="true"]
+		opacity tip-opacity
+		transform tip-transform-visible
+
+	.box
+		color text-color
+		text-shadow none
+		padding 0.6rem 0.8rem
+		background tip-bg-color
+		font-size 0.92rem
+		border 1px solid ui-border-color
+		border-radius ui-element-border-radius
+		box-shadow shadow-light
+		white-space nowrap
+
+	.arrow
+		position relative
+		width 6px
+		height 6px
+		margin-top -1px
+		transform translateX(-50%)
+		border-style solid
+		border-width 6px 6px 0 6px
+		border-color tip-bg-color transparent transparent transparent

scripts/Elements/tool-tip/tool-tip.ts

@@ -0,0 +1,60 @@
+import Diff from "scripts/Diff"
+
+export default class ToolTip extends HTMLElement {
+	anchor: HTMLElement
+	box: HTMLElement
+	arrow: HTMLElement
+
+	connectedCallback() {
+		this.box = document.createElement("div")
+		this.box.classList.add("box")
+		this.appendChild(this.box)
+
+		this.arrow = document.createElement("div")
+		this.arrow.classList.add("arrow")
+		this.appendChild(this.arrow)
+	}
+
+	hide() {
+		this.setAttribute("active", "false")
+	}
+
+	show(anchor: HTMLElement) {
+		const distanceToBorder = 5
+
+		this.anchor = anchor
+		this.box.textContent = this.anchor.getAttribute("aria-label")
+
+		let anchorRect = this.anchor.getBoundingClientRect()
+		let boxRect = this.box.getBoundingClientRect()
+
+		let finalX = anchorRect.left + anchorRect.width / 2 - boxRect.width / 2
+		let finalY = anchorRect.top - boxRect.height
+
+		let contentRect = {
+			left: distanceToBorder,
+			top: distanceToBorder,
+			right: document.body.clientWidth - distanceToBorder,
+			bottom: document.body.clientHeight - distanceToBorder
+		}
+
+		let offsetX = 0
+
+		if(finalX < contentRect.left) {
+			offsetX = contentRect.left - finalX
+			finalX += offsetX
+		} else if(finalX + boxRect.width > contentRect.right) {
+			offsetX = contentRect.right - (finalX + boxRect.width)
+			finalX += offsetX
+		}
+
+		let arrowX = boxRect.width / 2 - offsetX
+
+		Diff.mutations.queue(() => {
+			this.style.left = finalX + "px"
+			this.style.top = finalY + "px"
+			this.arrow.style.left = arrowX + "px"
+			this.setAttribute("active", "true")
+		})
+	}
+}

styles/tip.scarlet

@@ -1,90 +0,0 @@
-const tip-opacity = 0.97
-const tip-transform-hidden = translateX(-50%) translateY(-80%)
-const tip-transform-visible = translateX(-50%) translateY(-100%)
-
-mixin tip-before
-	content attr(data-label)
-	position absolute
-	top -10px
-	left 50%
-	z-index 100000
-	pointer-events none
-	opacity 0
-	transform tip-transform-hidden
-	font-size 0.92rem
-	color text-color
-	text-shadow none
-	padding 0.2rem 0.7rem
-	background tip-bg-color
-	border 1px solid ui-border-color
-	border-radius ui-element-border-radius
-	box-shadow shadow-light
-	white-space nowrap
-	default-transition
-
-mixin tip-after
-	content ""
-	position absolute
-	top -4px
-	left 50%
-	z-index 100001
-	pointer-events none
-	opacity 0
-	width 0
-	height 0
-	border-style solid
-	border-width 8px 8px 0 8px
-	border-color tip-bg-color transparent transparent transparent
-	transform tip-transform-hidden
-	default-transition
-
-.tip-offset-child
-	position absolute !important
-	left 0
-	top 0
-	pointer-events none
-
-// Tooltips are not activated by default.
-// This helps loading times as the browser
-// doesn't need to create pseudo elements on page load.
-.tip
-	// ...
-
-// When the browser is idle, we give all tips the "tip-active" class.
-.tip-active
-	position relative
-
-	:before
-		tip-before
-
-	:after
-		tip-after
-
-	:hover
-		:before
-			opacity tip-opacity
-			transform tip-transform-visible
-
-		:after
-			opacity tip-opacity
-			transform tip-transform-visible
-
-.tip-offset-root
-	position relative
-
-	:after
-		tip-after
-
-	.tip-offset-child
-		:before
-			tip-before
-
-	:hover
-		:after
-			opacity tip-opacity
-			transform tip-transform-visible
-
-		.tip-offset-child
-			:before
-				opacity tip-opacity
-				transform tip-transform-visible