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import { observable, action } from "mobx"
import { observer } from "mobx-react"
import { throttle } from "../../../clientUtils/Util"
import { Tippy } from "../../chart/Tippy"
import { FontAwesomeIcon } from "@fortawesome/react-fontawesome"
import { faCog } from "@fortawesome/free-solid-svg-icons/faCog"
interface ListChild {
index: number
child: ReactNode
}
/** A UI component inspired by the "Priority+ Navbar" or "Progressively Collapsing Navbar"*/
@observer
export class CollapsibleList extends React.Component {
private outerContainerRef: React.RefObject<HTMLDivElement> =
React.createRef()
private moreButtonRef: React.RefObject<HTMLLIElement> = React.createRef()
private outerContainerWidth: number = 0
private moreButtonWidth: number = 0
private itemsWidths: number[] = []
@observable private numItemsVisible?: number
private get children(): ListChild[] {
return (
React.Children.map(this.props.children, (child, i) => {
return {
index: i,
child,
}
}) ?? []
)
}
private updateOuterContainerWidth(): void {
this.outerContainerWidth =
this.outerContainerRef.current?.clientWidth ?? 0
}
private calculateItemWidths(): void {
this.itemsWidths = []
this.outerContainerRef.current
?.querySelectorAll(".list-item.visible, .list-item.hidden")
.forEach((item): number => this.itemsWidths.push(item.clientWidth))
}
@action private updateNumItemsVisible(): void {
const numItemsVisibleWithoutMoreButton = numItemsVisible(
this.itemsWidths,
this.outerContainerWidth
)
this.numItemsVisible =
numItemsVisibleWithoutMoreButton >= this.children.length
? numItemsVisibleWithoutMoreButton
: numItemsVisible(
this.itemsWidths,
this.outerContainerWidth,
this.moreButtonWidth
)
}
private get visibleItems(): ListChild[] {
return this.children.slice(0, this.numItemsVisible)
}
private get dropdownItems(): ListChild[] {
return this.children.slice(this.numItemsVisible)
}
@action private onResize = throttle((): void => {
this.updateItemVisibility()
}, 100)
@action private updateItemVisibility(): void {
this.updateOuterContainerWidth()
this.updateNumItemsVisible()
}
componentDidUpdate(): void {
// react to children being added or removed, for example
this.calculateItemWidths()
this.updateItemVisibility()
}
componentDidMount(): void {
window.addEventListener("resize", this.onResize)
this.moreButtonWidth = this.moreButtonRef.current?.clientWidth ?? 0
this.calculateItemWidths()
this.updateItemVisibility()
}
componentWillUnmount(): void {
window.removeEventListener("resize", this.onResize)
}
render(): JSX.Element {
return (
<div className="collapsibleList" ref={this.outerContainerRef}>
<ul>
{this.visibleItems.map(
(item): JSX.Element => (
<li key={item.index} className="list-item visible">
{item.child}
</li>
)
)}
<li
className="list-item moreButton"
ref={this.moreButtonRef}
style={{
visibility: this.dropdownItems.length
? "visible"
: "hidden",
}}
>
<MoreButton
options={this.dropdownItems.map(
(item): JSX.Element => (
<li
key={item.index}
className="list-item dropdown"
>
{item.child}
</li>
)
)}
/>
</li>
{/* Invisibly render dropdown items such that we can measure their clientWidth, too */}
{this.dropdownItems.map(
(item): JSX.Element => (
<li key={item.index} className="list-item hidden">
{item.child}
</li>
)
)}
</ul>
</div>
)
}
}
export class MoreButton extends React.Component<{
options: React.ReactElement[]
}> {
render(): JSX.Element {
const { options } = this.props
return (
<Tippy
content={options}
interactive={true}
trigger={"click"}
placement={"bottom"}
>
<span>
<FontAwesomeIcon icon={faCog} />
More
</span>
</Tippy>
)
}
}
/**
* Given: an array of item widths, a container width, and a starting width
* Returns the number of items that can fit in the container
*/
export function numItemsVisible(
itemWidths: number[],
containerWidth: number,
startingWidth: number = 0
): number {
let total = startingWidth
for (let i = 0; i < itemWidths.length; i++) {
if (total + itemWidths[i] > containerWidth) return i
else total += itemWidths[i]
}
return itemWidths.length
}
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