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import { property } from 'lit/decorators.js';
import { styleMap } from 'lit-html/directives/style-map.js';
import { RapidElement } from '../RapidElement';
import { getClasses, getMiddle, getCenter } from '../utils';
export class Tip extends RapidElement {
static get styles() {
return css`
.tip {
transition:
opacity 120ms cubic-bezier(0.2, 0, 0, 1),
transform 120ms cubic-bezier(0.2, 0, 0, 1);
margin: 0px;
position: fixed;
opacity: 0;
background: #fff;
padding: 4px 8px;
pointer-events: none;
border-radius: var(--curvature-widget);
box-shadow:
0 1px 10px 10px rgba(0, 0, 0, 0.035),
0 1px 3px 0px rgba(0, 0, 0, 0.1),
0 1px 2px 0 rgba(0, 0, 0, 0.06);
font-size: 14px;
z-index: 2147483647;
color: #333;
white-space: nowrap;
}
.tip kbd {
display: inline;
padding: 0;
border: none;
border-radius: 0;
background: transparent;
color: #8b98ab;
font-size: 11px;
font-weight: 500;
line-height: 1;
letter-spacing: 0.01em;
font-family: inherit;
}
.tip.hide-on-change {
transition: none;
}
/* hidden tips sit a few px toward their anchor so showing slides
them into position — up, down, or over based on the side */
.tip,
.tip.side-top {
transform: translateY(6px);
}
.tip.side-bottom {
transform: translateY(-6px);
}
.tip.side-left {
transform: translateX(6px);
}
.tip.side-right {
transform: translateX(-6px);
}
.show {
opacity: 1;
z-index: 2147483647;
}
.tip.show {
transform: translate(0, 0);
}
/* interactive tips accept the mouse while shown so their
contents can be selected or clicked */
.tip.interactive.show {
pointer-events: auto;
}
.slot {
display: flex;
flex-direction: column;
}
.arrow {
position: absolute;
color: #fff;
font-size: 10px;
line-height: 0px;
}
/* squash the glyphs along their pointing axis (and widen the
base a touch) so the arrows read fat and stubby rather than
long and pointy */
.◀ {
text-shadow: -1px 2px 2px rgba(0, 0, 0, 0.1);
transform: scale(0.6, 1.15);
}
.▶ {
text-shadow: 1px 2px 2px rgba(0, 0, 0, 0.1);
transform: scale(0.6, 1.15);
}
.▼ {
text-shadow: 0px 3px 3px rgba(0, 0, 0, 0.1);
transform: scale(1.15, 0.6);
}
.▲ {
text-shadow: 0px -1px 1px rgba(0, 0, 0, 0.1);
transform: scale(1.15, 0.6);
}
`;
}
@property({ type: String })
text: string;
@property({ attribute: false })
content: TemplateResult | string | null = null;
@property({ type: Boolean })
visible = false;
@property({ type: String })
position = 'auto';
// gap in px between the anchor and the tip edge; when unset, each
// side keeps its historical default (10-12px)
@property({ type: Number })
distance: number = null;
// font-size of the arrow glyph; offsets scale with it
@property({ type: Number, attribute: 'arrow-size' })
arrowSize = 10;
// interactive tips stay open while the mouse is over them so their
// contents can be selected or clicked
@property({ type: Boolean })
interactive = false;
@property({ type: Boolean })
hideOnChange: boolean;
top: number;
left: number;
@property({ type: Number, attribute: false })
width: number;
@property({ type: Boolean, attribute: false })
poppedTop: boolean;
@property({ type: Number })
delay = 350;
@property({ type: Number })
hideDelay = 40;
arrow: string;
arrowTop: number;
arrowLeft: number;
arrowDirection: string;
// the side the tip last popped on, driving which direction it
// slides in from
side: string;
showTimer = 0;
hideTimer = 0;
public willUpdate(changed: PropertyValues): void {
super.willUpdate(changed);
if (changed.has('text') && this.hideOnChange) {
this.visible = false;
}
// stamp the placement side before the show transition starts so
// the very first pop already slides in from the correct direction
if (changed.has('visible') && this.visible) {
this.prepareSide();
}
}
/**
* Measures where the tip will pop and applies the matching side-*
* class while the tip is still hidden, flushing styles so the slide
* animation starts from that side's offset rather than the default.
*/
private prepareSide() {
const tipEl = this.getDiv('.tip') as HTMLElement;
const anchorEl = this.getDiv('.slot') as HTMLElement;
if (!tipEl || !anchorEl) {
return;
}
const side = this.chooseSide(
this.position,
anchorEl.getBoundingClientRect(),
tipEl.getBoundingClientRect(),
8
);
if (side !== this.side) {
this.side = side;
// snap (not animate) the hidden tip to the new side's offset so
// the show transition starts from there — without suppressing
// the transition, the class swap itself animates and the show
// retargets from the old offset mid-flight
tipEl.style.transition = 'none';
tipEl.classList.remove(
'side-top',
'side-bottom',
'side-left',
'side-right'
);
tipEl.classList.add(`side-${side}`);
void tipEl.offsetWidth;
tipEl.style.transition = '';
}
}
public updated(changed: Map<string, any>) {
if ((changed.has('visible') || changed.has('text')) && this.visible) {
this.calculatePosition();
}
}
private calculatePosition() {
if (this.visible) {
const tipEl = this.getDiv('.tip') as HTMLElement;
const arrowEl = this.getDiv('.arrow') as HTMLElement;
const tipBounds = tipEl.getBoundingClientRect();
const anchorBounds = this.getDiv('.slot').getBoundingClientRect();
const viewportPadding = 8;
const side = this.chooseSide(
this.position,
anchorBounds,
tipBounds,
viewportPadding
);
this.side = side;
this.arrowLeft = 0;
this.arrowTop = 0;
// arrow offsets scale with the glyph size; the constants
// reproduce the historical values at the default size of 10
const arrow = this.arrowSize;
if (side === 'left') {
this.left = anchorBounds.left - tipBounds.width - (this.distance ?? 10);
this.top = getMiddle(anchorBounds, tipBounds);
// center the glyph box on the tip edge so the arrow always
// touches the tip regardless of glyph metrics
this.arrowTop = tipBounds.height / 2;
this.arrowLeft = tipBounds.width - arrow * 0.5;
this.arrow = '▶';
} else if (side === 'right') {
this.left = anchorBounds.right + (this.distance ?? 12);
this.top = getMiddle(anchorBounds, tipBounds);
this.arrowTop = tipBounds.height / 2;
this.arrowLeft = -arrow * 0.5;
this.arrow = '◀';
} else if (side === 'top') {
this.top = anchorBounds.top - tipBounds.height - (this.distance ?? 12);
this.left = getCenter(anchorBounds, tipBounds);
// tucked in slightly so the squashed glyph's base stays
// buried under the tip edge
this.arrowTop = tipBounds.height + arrow * 0.1;
this.arrowLeft = tipBounds.width / 2 - arrow * 0.4;
this.arrow = '▼';
} else if (side === 'bottom') {
this.top = anchorBounds.bottom + (this.distance ?? 10);
this.left = getCenter(anchorBounds, tipBounds);
this.arrowTop = -arrow * 0.1;
this.arrowLeft = tipBounds.width / 2 - arrow * 0.3;
this.arrow = '▲';
}
const minLeft = viewportPadding;
const maxLeft = window.innerWidth - tipBounds.width - viewportPadding;
const minTop = viewportPadding;
const maxTop = window.innerHeight - tipBounds.height - viewportPadding;
const unclampedLeft = this.left;
const unclampedTop = this.top;
this.left = this.clamp(this.left, minLeft, maxLeft);
this.top = this.clamp(this.top, minTop, maxTop);
const leftDelta = this.left - unclampedLeft;
const topDelta = this.top - unclampedTop;
if (side === 'top' || side === 'bottom') {
this.arrowLeft -= leftDelta;
this.arrowLeft = this.clamp(
this.arrowLeft,
8,
tipBounds.width - (arrow + 4)
);
} else {
this.arrowTop -= topDelta;
this.arrowTop = this.clamp(this.arrowTop, 8, tipBounds.height - 8);
}
// round to avoid sub-pixel rendering differences
this.top = Math.round(this.top);
this.left = Math.round(this.left);
this.arrowTop = Math.round(this.arrowTop);
this.arrowLeft = Math.round(this.arrowLeft);
// directly update DOM to avoid scheduling another update
tipEl.classList.remove(
'side-top',
'side-bottom',
'side-left',
'side-right'
);
tipEl.classList.add(`side-${side}`);
tipEl.style.top = `${this.top}px`;
tipEl.style.left = `${this.left}px`;
arrowEl.style.top = `${this.arrowTop}px`;
arrowEl.style.left = `${this.arrowLeft}px`;
arrowEl.textContent = this.arrow;
arrowEl.className = `arrow ${this.arrow}`;
}
}
private clamp(value: number, min: number, max: number): number {
if (max < min) {
return min;
}
return Math.min(Math.max(value, min), max);
}
private chooseSide(
preferred: string,
anchorBounds: DOMRect,
tipBounds: DOMRect,
viewportPadding: number
): string {
const gap = 12;
const spaces = {
left: anchorBounds.left - viewportPadding,
right: window.innerWidth - anchorBounds.right - viewportPadding,
top: anchorBounds.top - viewportPadding,
bottom: window.innerHeight - anchorBounds.bottom - viewportPadding
};
const required = {
left: tipBounds.width + gap,
right: tipBounds.width + gap,
top: tipBounds.height + gap,
bottom: tipBounds.height + gap
};
const fits = (side: string) => spaces[side] >= required[side];
const opposite: Record<string, string> = {
left: 'right',
right: 'left',
top: 'bottom',
bottom: 'top'
};
if (preferred !== 'auto') {
if (fits(preferred)) {
return preferred;
}
const fallback = opposite[preferred];
if (fallback && fits(fallback)) {
return fallback;
}
return preferred;
}
const order = ['bottom', 'right', 'left', 'top'];
let bestSide = order[0];
let bestSpace = -1;
for (const side of order) {
if (fits(side)) {
return side;
}
if (spaces[side] > bestSpace) {
bestSpace = spaces[side];
bestSide = side;
}
}
return bestSide;
}
private handleMouseEnter() {
window.clearTimeout(this.hideTimer);
window.clearTimeout(this.showTimer);
this.showTimer = window.setTimeout(() => {
this.visible = true;
}, this.delay);
}
private handleMouseLeave() {
window.clearTimeout(this.showTimer);
window.clearTimeout(this.hideTimer);
// interactive tips linger long enough for the mouse to travel from
// the anchor into the tip itself
const hideDelay = this.interactive
? Math.max(this.hideDelay, 300)
: this.hideDelay;
if (hideDelay > 0) {
this.hideTimer = window.setTimeout(() => {
this.visible = false;
}, hideDelay);
return;
}
this.visible = false;
}
private handleTipMouseEnter() {
// the mouse made it into the tip — cancel any pending hide
window.clearTimeout(this.hideTimer);
}
public render(): TemplateResult {
const tipStyle: any = {
top: this.top ? `${this.top}px` : '0px',
left: this.left ? `${this.left}px` : '0px'
};
const arrowStyle: any = {
top: this.arrowTop ? `${this.arrowTop}px` : '0px',
left: this.arrowLeft ? `${this.arrowLeft}px` : '0px',
fontSize: `${this.arrowSize}px`
};
if (this.width) {
tipStyle.width = `${this.width}px`;
}
const classes = getClasses({
tip: true,
show: this.visible,
top: this.poppedTop,
interactive: this.interactive,
'hide-on-change': this.hideOnChange,
[`side-${this.side}`]: !!this.side
});
return html`
<div
class="slot"
@click=${this.handleMouseLeave}
@mouseenter=${this.handleMouseEnter}
@mouseleave=${this.handleMouseLeave}
>
<slot></slot>
</div>
<div
class="${classes}"
style=${styleMap(tipStyle)}
@mouseenter=${this.handleTipMouseEnter}
@mouseleave=${this.handleMouseLeave}
>
${this.content ?? this.text}
<div class="arrow" style=${styleMap(arrowStyle)}></div>
</div>
`;
}
}
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