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probabilities_ui.js
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probabilities_ui.js
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(function () {
var root = this;
var percent = function(number) {
return `${(number*100).toFixed(2)}%`
}
const notes = [
"C",
"C#",
"D",
"D#",
"E",
"F",
"F#",
"G",
"G#",
"A",
"A#",
"B",
];
var ProbabilitiesUI = function (id, settings) {
this.container = document.getElementById(id);
this.on_change = function (probabilities, index) { }
let this_object = this;
let user_settings = settings || {};
this.settings = {
notes: user_settings.notes || 13,
fix_values: user_settings.fix_values || { 0: 0 },
first_note: user_settings.first_note || "C",
initial_values: user_settings.initial_values || [],
titles: user_settings.titles || []
};
this.probabilities = []
this.ul = document.createElement("ul");
if (this.container.querySelector("ul")) {
this.container.replaceChild(this.ul, this.container.querySelector("ul"));
} else {
this.container.appendChild(this.ul);
}
let index_offset = notes.indexOf(this.settings.first_note);
if (index_offset === -1) {
index_offset = 0;
this.settings.first_note = "C";
}
this.bars = []
let css_prefix = 'probabilities_widget'
let width = percent(1/this.settings.notes)
// Create "keys"
let mousedown_key = false, mousedown_i = -1;
for (let i = 0; i < this.settings.notes; i++) {
if (i in this.settings.fix_values) this.probabilities.push(this.settings.fix_values[i])
else if (i < this.settings.initial_values.length) this.probabilities.push(this.settings.initial_values[i])
else this.probabilities.push(0)
let note_index = (i + index_offset) % 12;
let note = notes[note_index];
let black_key = note.includes('#');
let needs_sep = note[0] == 'B' || note[0] == 'E'
let key = document.createElement('li')
key.classList.add(css_prefix + '-key')
if (black_key) key.classList.add(css_prefix + '-black-key')
else key.classList.add(css_prefix + '-white-key')
if (needs_sep) key.classList.add(css_prefix+'-key-sep')
if (this.settings.titles.length > i) key.title = this.settings.titles[i]
if (i in this.settings.fix_values) key.classList.add(css_prefix+'-fixed-key')
key.style.width = width
this.ul.appendChild(key);
let bar = document.createElement('div')
bar.classList.add(css_prefix + '-bar')
bar.style.height = percent(this.probabilities[i]);
key.appendChild(bar)
this.bars.push(bar)
key.onmousedown = function(event) {
if (mousedown_i == -1 && !(i in this_object.settings.fix_values)){
mousedown_i = i;
mousedown_key = key;
mousedown_key.classList.add(css_prefix+'-key-active')
this_object.container.classList.add(css_prefix+'-active')
let rect = mousedown_key.getBoundingClientRect();
let position = Math.max(Math.min((rect.bottom - event.clientY) / rect.height,1.0),0.0);
this_object.probabilities[mousedown_i] = position;
this_object.bars[mousedown_i].style.height = percent(position)
}
}
}
this.container.onmousemove = function(event) {
if (mousedown_i >= 0) {
let rect = mousedown_key.getBoundingClientRect();
let position = Math.max(Math.min((rect.bottom - event.clientY) / rect.height,1.0),0.0);
this_object.probabilities[mousedown_i] = position;
this_object.bars[mousedown_i].style.height = percent(position)
}
}
this.container.onmouseleave = function(event) {
if (mousedown_i >= 0) {
this_object.on_change(this_object.probabilities,mousedown_i);
mousedown_key.classList.remove(css_prefix+'-key-active')
this_object.container.classList.remove(css_prefix+'-active')
}
mousedown_i = -1
}
this.container.onmouseup = function(event) {
if (mousedown_i >= 0){
this_object.on_change(this_object.probabilities,mousedown_i);
mousedown_key.classList.remove(css_prefix+'-key-active')
this_object.container.classList.remove(css_prefix+'-active')
}
mousedown_i = -1
}
this.update_view = function() {
for (let i = 0; i < this_object.settings.notes; i++) {
this_object.bars[i].style.height = percent(this_object.probabilities[i])
}
}
this.set_probabilities = function(probabilities) {
if (probabilities.length != this_object.settings.notes) {
console.log("Invalid probabilities!")
console.log(probabilities);
return;
}
this_object.probabilities = probabilities;
this_object.update_view()
}
if (this.settings.initial_values.length == this.settings.notes){
let reset_btn = document.createElement('a')
reset_btn.text = 'Reset to default'
reset_btn.onclick = function(event) {
this_object.set_probabilities(this_object.settings.initial_values)
this_object.on_change(this_object.probabilities,-1);
}
this.container.append(reset_btn)
}
this.update_view();
};
if (typeof exports !== "undefined") {
if (typeof module !== "undefined" && module.exports) {
exports = module.exports = ProbabilitiesUI;
}
exports.ProbabilitiesUI = ProbabilitiesUI;
} else {
root.ProbabilitiesUI = ProbabilitiesUI;
}
})(this);