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export default class InputComponent {
constructor(target) {
this.pressed = {};
this.onKeyListeners = [];
target.addEventListener('keypress', this.onKeyPress.bind(this));
target.addEventListener('keydown', this.onKeyDown.bind(this));
target.addEventListener('keyup', this.onKeyUp.bind(this));
}
update() {
}
onKey(cb) {
this.onKeyListeners.push(cb);
}
onKeyPress(e) {
if (this.pressed[e.key] && this.pressed[e.key] !== 'keypress') {
return;
}
this.pressed[e.key] = 'keypress';
this.capture(e);
}
onKeyDown(e) {
if (this.pressed[e.key] && this.pressed[e.key] !== 'keydown') {
return;
}
this.pressed[e.key] = 'keydown';
this.capture(e);
}
onKeyUp(e) {
delete this.pressed[e.key];
}
capture(e) {
if (this.fromInput(e)) {
if (e.key === 'Escape' && e.target.blur) {
e.target.blur();
}
return;
}
if (['Shift', 'Control', 'Alt', 'OS'].includes(e.key)) {
// pressing only meta key is ignored
return;
}
let stop = false;
for (let listener of this.onKeyListeners) {
stop = stop || listener(e.key, e.ctrlKey);
if (stop) {
break;
}
}
if (stop) {
e.preventDefault();
e.stopPropagation();
}
}
fromInput(e) {
return e.target instanceof HTMLInputElement ||
e.target instanceof HTMLTextAreaElement ||
e.target instanceof HTMLSelectElement ||
e.target instanceof HTMLElement &&
e.target.hasAttribute('contenteditable') && (
e.target.getAttribute('contenteditable').toLowerCase() === 'true' ||
e.target.getAttribute('contenteditable').toLowerCase() === '');
}
}
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