range finalized

This commit is contained in:
Ondrej Zara 2019-04-30 09:42:16 +02:00
parent d7f93c8a20
commit c2c1488d1e
3 changed files with 85 additions and 19 deletions

View file

@ -104,7 +104,7 @@ x-range {
--elapsed-color: lightgray;
--remaining-color: transparent;
--radius: calc(var(--track-size)/2);
width: 144px;
width: 192px;
height: 16px;
position: relative;
}

View file

@ -9,7 +9,7 @@ x-range {
--radius: calc(var(--track-size)/2);
width: 144px;
width: 192px;
height: 16px;
position: relative;

View file

@ -1,7 +1,7 @@
import * as html from "./html.js";
class Range extends HTMLElement {
static get observedAttributes() { return ["min", "max", "value", "disabled"]; }
static get observedAttributes() { return ["min", "max", "value", "step", "disabled"]; }
constructor() {
super();
@ -25,26 +25,45 @@ class Range extends HTMLElement {
this._update();
this.addEventListener("mousedown", this);
this.addEventListener("keydown", this);
}
get _valueAsNumber() {
let raw = (this.hasAttribute("value") ? Number(this.getAttribute("value")) : 50);
return this._constrain(raw);
}
get _minAsNumber() {
return (this.hasAttribute("min") ? Number(this.getAttribute("min")) : 0);
}
get _maxAsNumber() {
return (this.hasAttribute("max") ? Number(this.getAttribute("max")) : 100);
}
get _stepAsNumber() {
return (this.hasAttribute("step") ? Number(this.getAttribute("step")) : 1);
}
get value() { return String(this._valueAsNumber); }
get valueAsNumber() { return this._valueAsNumber; }
get min() { return this.hasAttribute("min") ? this.getAttribute("min") : ""; }
get max() { return this.hasAttribute("max") ? this.getAttribute("max") : ""; }
get step() { return this.hasAttribute("step") ? this.getAttribute("step") : ""; }
get disabled() { return this.hasAttribute("disabled"); }
set _valueAsNumber(value) { this.value = String(value); }
set min(min) { this.setAttribute("min", min); }
set max(max) { this.setAttribute("max", max); }
set value(value) { this.setAttribute("value", value); }
set step(step) { this.setAttribute("step", step); }
set disabled(disabled) {
disabled ? this.setAttribute("disabled", "") : this.removeAttribute("disabled");
}
get value() { return (this.hasAttribute("value") ? this.getAttribute("value") : "50"); }
get valueAsNumber() { return Number(this.value); }
get min() { return this.getAttribute("min"); }
get max() { return this.getAttribute("max"); }
get disabled() { return this.hasAttribute("disabled"); }
attributeChangedCallback(name, oldValue, newValue) {
switch (name) {
case "min":
case "max":
case "value":
case "step":
this._update();
break;
}
@ -68,13 +87,61 @@ class Range extends HTMLElement {
document.removeEventListener("mouseup", this);
this.dispatchEvent(new CustomEvent("change"));
break;
case "keydown":
if (this.disabled) { return; }
this._handleKey(e.code);
this.dispatchEvent(new CustomEvent("input"));
this.dispatchEvent(new CustomEvent("change"));
break;
}
}
_handleKey(code) {
let min = this._minAsNumber;
let max = this._maxAsNumber;
let range = max - min;
let step = this._stepAsNumber;
switch (code) {
case "ArrowLeft":
case "ArrowDown":
this._valueAsNumber = this._constrain(this._valueAsNumber - step);
break;
case "ArrowRight":
case "ArrowUp":
this._valueAsNumber = this._constrain(this._valueAsNumber + step);
break;
case "Home": this._valueAsNumber = this._constrain(min); break;
case "End": this._valueAsNumber = this._constrain(max); break;
case "PageUp": this._valueAsNumber = this._constrain(this._valueAsNumber + range/10); break;
case "PageDown": this._valueAsNumber = this._constrain(this._valueAsNumber - range/10); break;
}
}
_constrain(value) {
const min = this._minAsNumber;
const max = this._maxAsNumber;
const step = this._stepAsNumber;
value = Math.max(value, min);
value = Math.min(value, max);
value -= min;
value = Math.round(value / step) * step;
value += min;
if (value > max) { value -= step; }
return value;
}
_update() {
let min = Number(this.min || 0);
let max = Number(this.max || 100);
let frac = (this.valueAsNumber - min) / (max - min);
let min = this._minAsNumber;
let max = this._maxAsNumber;
let frac = (this._valueAsNumber-min) / (max-min);
this._dom.thumb.style.left = `${frac * 100}%`;
this._dom.remaining.style.left = `${frac * 100}%`;
this._dom.elapsed.style.width = `${frac * 100}%`;
@ -86,15 +153,14 @@ class Range extends HTMLElement {
x = Math.max(x, rect.left);
x = Math.min(x, rect.right);
let min = Number(this.min || 0);
let max = Number(this.max || 100);
let min = this._minAsNumber;
let max = this._maxAsNumber;
let frac = (x-rect.left)/(rect.right-rect.left);
let value = min + frac * (max-min);
value = Math.round(value); // fixme
if (value == this.valueAsNumber) { return; }
let frac = (x-rect.left) / (rect.right-rect.left);
let value = this._constrain(min + frac * (max-min));
if (value == this._valueAsNumber) { return; }
this.value = value.toString();
this._valueAsNumber = value;
this.dispatchEvent(new CustomEvent("input"));
}
}