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import { chromaticScale } from "./scale.mjs";
customElements.define('x-string', class extends HTMLElement {
static observedAttributes = ['tonic', 'value', 'frets'];
constructor() {
super();
console.debug('x-string#constructor', this);
const template = this.querySelector('template').content;
const shadowRoot = this.attachShadow({mode: 'open'}).appendChild(template.cloneNode(true));
console.debug('attached', template, 'to shadow root', shadowRoot);
this.muted.onclick = this.muteClicked.bind(this);
this.tonic.onclick = this.fretClicked.bind(this);
}
get tonic() {
return this.fretList.querySelector('.tonic');
}
get fretList() {
return this.querySelector('.fretlist');
}
get fretInputs() {
return this.querySelectorAll('.fretlist input[name="string"]');
}
get muted() {
return this.querySelector('input[name="muted"]');
}
get selected() {
return this.querySelector('[slot="selected"]');
}
get chromIndex() {
return chromaticScale.indexOf(this.getAttribute('tonic'));
}
muteClicked(e) {
e.preventDefault();
console.debug('x-string#muteClicked', this, e.target.checked);
if (e.target.checked) {
this.setAttribute('value', 'x');
} else {
this.setAttribute('value', this.getAttribute('tonic'));
}
}
fretClicked(e) {
e.preventDefault();
console.debug('x-string#fretClicked', this, e.target.getAttribute('value'));
this.setAttribute('value', e.target.getAttribute('value'));
}
attributeChangedCallback(name, old, v) {
console.debug('x-string#attributeChangedCallback', this, name, old, v);
switch (name) {
case 'tonic':
return this.updateTonic(v);
case 'value':
return this.updateValue(v);
case 'frets':
return this.updateFrets(Number(old || '0'), Number(v));
}
}
updateTonic(tonic) {
console.debug('x-string#updateTonic', this, tonic);
// for compat with the radio inputs.
this.tonic.setAttribute('value', tonic);
this.tonic.textContent = tonic;
// update all fret values
this.fretInputs
.forEach((fret, i) => {
console.debug(' -- fret', i, fret);
fret.setAttribute('value', i.toString());
});
}
updateValue(value) {
console.debug('x-string#updateValue', this, value);
this.selected.textContent = value;
if (value === 'x') {
this.classList.add('muted');
this.muted.checked = true;
return;
} else {
this.classList.remove('muted');
this.muted.checked = false;
}
this.fretInputs
.forEach(fret => {
fret.checked = this.getAttribute('value') === fret.getAttribute('value');
if (fret.checked) {
fret.classList.add('checked');
} else {
fret.classList.remove('checked');
}
console.debug(' -- fret', fret, fret.checked);
});
}
updateFrets(old, frets) {
console.debug('x-string#updateFrets', this, old, frets);
if (old < frets) {
const tonic = this.getAttribute('tonic');
if (!tonic) {
return;
}
const chromIndex = this.chromIndex;
const fretList = this.fretList;
for (let i = old+1; i <= frets; i++) {
const note = chromaticScale[chromIndex + i];
console.debug(' -- appending fret', i, 'from', note, fretList);
const input = document.createElement('input');
input.setAttribute('type', 'radio');
input.setAttribute('name', 'string');
input.setAttribute('value', note);
input.onclick = this.fretClicked.bind(this);
const li = document.createElement('li');
li.appendChild(input);
fretList.appendChild(li);
}
}
}
});
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