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import * as dom from '../shared/utils/dom';
import Key from '../shared/settings/Key';
const cancelKey = (e: KeyboardEvent): boolean => {
if (e.key === 'Escape') {
return true;
}
if (e.key === '[' && e.ctrlKey) {
return true;
}
return false;
};
const modifiedKeyName = (name: string): string => {
if (name === ' ') {
return 'Space';
}
if (name.length === 1) {
return name;
} else if (name === 'Escape') {
return 'Esc';
}
return name;
};
// visible for testing
export const keyFromKeyboardEvent = (e: KeyboardEvent): Key => {
const key = modifiedKeyName(e.key);
let shift = e.shiftKey;
if (key.length === 1 && key.toUpperCase() === key.toLowerCase()) {
// make shift false for symbols to enable key bindings by symbold keys.
// But this limits key bindings by symbol keys with Shift
// (such as Shift+$>.
shift = false;
}
return new Key({
key: modifiedKeyName(e.key),
shift: shift,
ctrl: e.ctrlKey,
alt: e.altKey,
meta: e.metaKey,
});
};
export default class InputDriver {
private pressed: {[key: string]: string} = {};
private onKeyListeners: ((key: Key) => boolean)[] = [];
constructor(target: HTMLElement) {
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));
}
onKey(cb: (key: Key) => boolean) {
this.onKeyListeners.push(cb);
}
private onKeyPress(e: KeyboardEvent) {
if (this.pressed[e.key] && this.pressed[e.key] !== 'keypress') {
return;
}
this.pressed[e.key] = 'keypress';
this.capture(e);
}
private onKeyDown(e: KeyboardEvent) {
if (this.pressed[e.key] && this.pressed[e.key] !== 'keydown') {
return;
}
this.pressed[e.key] = 'keydown';
this.capture(e);
}
private onKeyUp(e: KeyboardEvent) {
delete this.pressed[e.key];
}
// eslint-disable-next-line max-statements
private capture(e: KeyboardEvent) {
const target = e.target;
if (!(target instanceof HTMLElement)) {
return;
}
if (this.fromInput(target)) {
if (cancelKey(e) && target.blur) {
target.blur();
}
return;
}
if (['Shift', 'Control', 'Alt', 'OS'].includes(e.key)) {
// pressing only meta key is ignored
return;
}
const key = keyFromKeyboardEvent(e);
for (const listener of this.onKeyListeners) {
const stop = listener(key);
if (stop) {
e.preventDefault();
e.stopPropagation();
break;
}
}
}
private fromInput(e: Element) {
return e instanceof HTMLInputElement ||
e instanceof HTMLTextAreaElement ||
e instanceof HTMLSelectElement ||
dom.isContentEditable(e);
}
}
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