Press n or j to go to the next uncovered block, b, p or k for the previous block.
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import { styleMap } from 'lit-html/directives/style-map.js';
import { property } from 'lit/decorators.js';
import { FieldElement } from './FieldElement';
import { getClasses } from '../utils';
export class TembaSlider extends FieldElement {
static get styles() {
return css`
:host {
display: block;
}
.track {
height: 2px;
border-top: 0.5em solid var(--surface);
border-bottom: 0.5em solid var(--surface);
background: var(--border-strong);
flex-grow: 1;
}
.circle {
margin-bottom: -1.05em;
margin-left: -0.5em;
width: 0.75em;
height: 0.75em;
border: 2px solid var(--border-strong);
border-radius: 999px;
position: relative;
background: var(--surface);
box-shadow: 0 0 0 4px var(--surface);
transition: transform 200ms ease-in-out;
}
.grabbed .track {
cursor: pointer;
}
:hover .circle {
border-color: var(--text-2);
cursor: pointer;
}
.grabbed .circle {
border-color: var(--accent);
background: var(--surface);
}
.grabbed .circle {
transform: scale(1.2);
}
.wrapper {
display: flex;
align-items: center;
}
.pre,
.post {
font-size: 0.9em;
color: var(--text-3);
padding: 0em 1em;
}
`;
}
@property({ type: Boolean })
range = false;
@property({ type: Number })
min = 0;
@property({ type: Number })
max = 100;
circleX = 0;
grabbed = false;
public firstUpdated(changes: Map<string, any>) {
super.firstUpdated(changes);
this.handleMouseMove = this.handleMouseMove.bind(this);
this.handleMouseUp = this.handleMouseUp.bind(this);
}
public willUpdate(changedProperties: PropertyValues): void {
super.willUpdate(changedProperties);
if (changedProperties.has('value')) {
// Normalize value to min/max bounds
let cValue = parseInt(this.value);
if (!cValue || cValue < this.min) {
cValue = this.min;
} else if (cValue > this.max) {
cValue = this.max;
}
this.value = '' + cValue;
}
}
public updated(changedProperties: Map<string, any>): void {
if (changedProperties.has('value')) {
this.updateCircle();
}
}
public updateValue(evt: MouseEvent) {
const track = this.shadowRoot.querySelector('.track') as HTMLDivElement;
const left = evt.pageX - track.offsetLeft;
const pct = left / track.offsetWidth;
const range = this.max - this.min;
const pctAsValue = range * pct + this.min;
this.value =
'' + Math.max(this.min, Math.min(Math.round(pctAsValue), this.max));
}
public handleMouseMove(evt: MouseEvent) {
if (this.grabbed) {
this.updateValue(evt);
}
}
public handleTrackDown(evt: MouseEvent) {
this.grabbed = true;
document.addEventListener('mousemove', this.handleMouseMove);
document.addEventListener('mouseup', this.handleMouseUp);
document.querySelector('html').classList.add('dragging');
this.updateValue(evt);
this.requestUpdate();
}
public handleMouseUp(evt: MouseEvent) {
this.grabbed = false;
this.updateValue(evt);
this.requestUpdate();
document.removeEventListener('mousemove', this.handleMouseMove);
document.removeEventListener('mouseup', this.handleMouseUp);
document.querySelector('html').classList.remove('dragging');
}
public updateCircle() {
const track = this.shadowRoot.querySelector('.track') as HTMLDivElement;
const pre = this.shadowRoot.querySelector('.pre') as HTMLDivElement;
const circle = this.shadowRoot.querySelector('.circle') as HTMLDivElement;
const range = this.max - this.min;
const cValue = parseInt(this.value) || this.min;
const pct = (cValue - this.min) / range;
const pctAsPixels = track.offsetWidth * pct;
this.circleX = Math.round(pctAsPixels + (pre ? pre.offsetWidth : 0));
// directly update DOM to avoid scheduling another update
circle.style.left = this.circleX + 'px';
}
public renderWidget(): TemplateResult {
return html` <div class="${getClasses({ grabbed: this.grabbed })}">
<div
style=${styleMap({ left: this.circleX + 'px' })}
class="circle"
@mousedown=${this.handleTrackDown}
></div>
<div class="wrapper">
${this.range ? html`<div class="pre">${this.min}</div>` : null}
<div class="track" @mousedown=${this.handleTrackDown}></div>
${this.range ? html`<div class="post">${this.max}</div>` : null}
</div>
</div>`;
}
}
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