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<script>
import { onMount } from 'svelte';
import { createEventDispatcher } from 'svelte';
const dispatch = createEventDispatcher();
export let min = 0;
export let max = 100;
export let value = 0;
export let enabled = true;
let svg;
let indicator;
let thumb;
let track;
let cVal = value;
let touchActive = false;
let inputCoordinates;
function setValue(_value) {
value = _value;
let delta = cVal - _value;
if (!touchActive && (Math.abs(delta) > 10)) {
let animInterval = setInterval(() => {
cVal = cVal + ((delta < 0) ? 1 : -1);
setThumbAndTrack(cVal);
if ( ((delta < 0) && (cVal >= value)) || ((delta > 0) && (cVal <= value)) ) {
clearInterval(animInterval);
}
}, 1);
} else {
setThumbAndTrack(value);
cVal = value;
}
}
function setThumbAndTrack(val_pos) {
if (indicator && thumb) {
let indicator_value = (((val_pos - min) * 207) / (max - min));
indicator.style.strokeDasharray = `${indicator_value},207`;
let p = indicator.getPointAtLength(indicator_value);
thumb.setAttribute("transform", `translate(${p.x}, ${p.y})`);
}
}
onMount(async() => {
let lastVal = value;
setValue(value);
setInterval(() => {
if (value != lastVal) {
setValue(value);
lastVal = value;
}
}, 500);
window.indicator = indicator;
inputCoordinates = svg.createSVGPoint();
addEventListenersToElement(thumb);
addEventListenersToElement(track);
addEventListenersToElement(indicator);
});
function addEventListenersToElement(el) {
el.addEventListener("touchstart", () => {
touchActive = true;
}, { capture: true, passive: false });
el.addEventListener("touchend", () => {
touchActive = false;
}, { capture: true, passive: true });
el.addEventListener("touchmove", updateValueFromTouchEvent, { capture: true, passive: false });
el.addEventListener("mousedown", (ev) => {
touchActive = true;
updateValueFromMouseEvent(ev);
svg.addEventListener("mousemove", updateValueFromMouseEvent);
}, { capture: true, passive: false });
el.addEventListener("mouseup", (ev) => {
touchActive = false;
svg.removeEventListener("mousemove", updateValueFromMouseEvent);
}, { capture: true, passive: false });
}
function updateValueFromTouchEvent(ev) {
inputCoordinates.x = ev.touches[0].clientX;
inputCoordinates.y = ev.touches[0].clientY;
updateValueFromPoint(inputCoordinates);
ev.preventDefault();
}
function updateValueFromMouseEvent(ev) {
inputCoordinates.x = ev.clientX;
inputCoordinates.y = ev.clientY;
updateValueFromPoint(inputCoordinates);
ev.preventDefault();
}
function updateValueFromPoint(point) {
inputCoordinates = inputCoordinates.matrixTransform(svg.getScreenCTM().inverse());
setValue(getValueAtLength(indicator, getPathLangthOfClosestPoint(indicator, inputCoordinates)));
dispatch("change");
}
function getPathLangthOfClosestPoint(path, point) {
let pathLength = path.getTotalLength();
let shortestDistance = Number.MAX_VALUE;
let shortestPathDistance;
for (let i = 0; i <= pathLength; i += 4) {
let p = path.getPointAtLength(i),
dx = p.x - point.x,
dy = p.y - point.y,
cDistance = dx * dx + dy * dy;
if (cDistance < shortestDistance) {
shortestDistance = cDistance;
shortestPathDistance = i;
}
}
return shortestPathDistance;
}
function getValueAtLength(path, length) {
return Math.floor(((length * (max - min)) / path.getTotalLength()) + min);
}
</script>
<style>
svg {
--primary-color: var(--yellow-500);
--muted-color: var(--yellow-100);
margin-top: -15px;
}
path {
transition: stroke 0.2s ease;
}
circle {
filter: drop-shadow(0 0 2px #d0d0d0);
transition: stroke 0.2s ease;
}
circle:hover {
stroke: #f9f9f9;
}
circle:active {
fill: var(--yellow-600);
}
.disabled {
--primary-color: var(--grey-200);
--muted-color: var(--grey-50);
}
</style>
<svg bind:this={svg} class:disabled={!enabled} viewbox="0 0 100 100">
<path bind:this={track} fill="none" stroke-linecap="round" stroke-width="10" stroke="var(--muted-color)"
d="M25 85
a 40 40 0 1 1 50 0
">
</path>
<path bind:this={indicator} fill="none" stroke-linecap="round" stroke-width="10" stroke="var(--primary-color)"
stroke-dasharray="207,0"
d="M25 85
a 40 40 0 1 1 50 0">
</path>
<circle bind:this={thumb} cx="0" cy="0" r="8" stroke="white" stroke-width="3" fill="var(--primary-color)" />
<text id="count" x="50" y="55" text-anchor="middle" dy="7" font-size="20">{value}%</text>
</svg>
|
