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* Copyright (c) Nicolas Gallagher.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @flow
*/
import { canUseDOM } from 'fbjs/lib/ExecutionEnvironment';
import createEventHandle from '../createEventHandle';
export type Modality = 'keyboard' | 'mouse' | 'touch' | 'pen';
const supportsPointerEvent = () => !!(typeof window !== 'undefined' && window.PointerEvent != null);
let activeModality = 'keyboard';
let modality = 'keyboard';
let previousModality;
let previousActiveModality;
let isEmulatingMouseEvents = false;
const listeners = new Set();
const KEYBOARD = 'keyboard';
const MOUSE = 'mouse';
const TOUCH = 'touch';
const BLUR = 'blur';
const CONTEXTMENU = 'contextmenu';
const FOCUS = 'focus';
const KEYDOWN = 'keydown';
const MOUSEDOWN = 'mousedown';
const MOUSEMOVE = 'mousemove';
const MOUSEUP = 'mouseup';
const POINTERDOWN = 'pointerdown';
const POINTERMOVE = 'pointermove';
const SCROLL = 'scroll';
const SELECTIONCHANGE = 'selectionchange';
const TOUCHCANCEL = 'touchcancel';
const TOUCHMOVE = 'touchmove';
const TOUCHSTART = 'touchstart';
const VISIBILITYCHANGE = 'visibilitychange';
const bubbleOptions = { passive: true };
const captureOptions = { capture: true, passive: true };
// Window events
const addBlurListener = createEventHandle(BLUR, bubbleOptions);
const addFocusListener = createEventHandle(FOCUS, bubbleOptions);
// Must be capture phase because 'stopPropagation' might prevent these
// events bubbling to the document.
const addVisibilityChangeListener = createEventHandle(VISIBILITYCHANGE, captureOptions);
const addKeyDownListener = createEventHandle(KEYDOWN, captureOptions);
const addPointerDownListener = createEventHandle(POINTERDOWN, captureOptions);
const addPointerMoveListener = createEventHandle(POINTERMOVE, captureOptions);
// Fallback events
const addContextMenuListener = createEventHandle(CONTEXTMENU, captureOptions);
const addMouseDownListener = createEventHandle(MOUSEDOWN, captureOptions);
const addMouseMoveListener = createEventHandle(MOUSEMOVE, captureOptions);
const addMouseUpListener = createEventHandle(MOUSEUP, captureOptions);
const addScrollListener = createEventHandle(SCROLL, captureOptions);
const addSelectiomChangeListener = createEventHandle(SELECTIONCHANGE, captureOptions);
const addTouchCancelListener = createEventHandle(TOUCHCANCEL, captureOptions);
const addTouchMoveListener = createEventHandle(TOUCHMOVE, captureOptions);
const addTouchStartListener = createEventHandle(TOUCHSTART, captureOptions);
function restoreModality() {
if (previousModality != null || previousActiveModality != null) {
if (previousModality != null) {
modality = previousModality;
previousModality = null;
}
if (previousActiveModality != null) {
activeModality = previousActiveModality;
previousActiveModality = null;
}
callListeners();
}
}
function onBlurWindow() {
previousModality = modality;
previousActiveModality = activeModality;
activeModality = KEYBOARD;
modality = KEYBOARD;
callListeners();
// for fallback events
isEmulatingMouseEvents = false;
}
function onFocusWindow() {
restoreModality();
}
function onKeyDown(event) {
Iif (event.metaKey || event.altKey || event.ctrlKey) {
return;
}
Eif (modality !== KEYBOARD) {
modality = KEYBOARD;
activeModality = KEYBOARD;
callListeners();
}
}
function onVisibilityChange() {
if (document.visibilityState !== 'hidden') {
restoreModality();
}
}
function onPointerish(event: any) {
const eventType = event.type;
if (supportsPointerEvent()) {
if (eventType === POINTERDOWN) {
Eif (activeModality !== event.pointerType) {
modality = event.pointerType;
activeModality = event.pointerType;
callListeners();
}
return;
}
if (eventType === POINTERMOVE) {
if (modality !== event.pointerType) {
modality = event.pointerType;
callListeners();
}
return;
}
}
// Fallback for non-PointerEvent environment
else {
if (!isEmulatingMouseEvents) {
if (eventType === MOUSEDOWN) {
if (activeModality !== MOUSE) {
modality = MOUSE;
activeModality = MOUSE;
callListeners();
}
}
if (eventType === MOUSEMOVE) {
if (modality !== MOUSE) {
modality = MOUSE;
callListeners();
}
}
}
// Flag when browser may produce emulated events
if (eventType === TOUCHSTART) {
isEmulatingMouseEvents = true;
Iif (event.touches && event.touches.length > 1) {
isEmulatingMouseEvents = false;
}
Eif (activeModality !== TOUCH) {
modality = TOUCH;
activeModality = TOUCH;
callListeners();
}
return;
}
// Remove flag after emulated events are finished or cancelled, and if an
// event occurs that cuts short a touch event sequence.
if (
eventType === CONTEXTMENU ||
eventType === MOUSEUP ||
eventType === SELECTIONCHANGE ||
eventType === SCROLL ||
eventType === TOUCHCANCEL ||
eventType === TOUCHMOVE
) {
isEmulatingMouseEvents = false;
}
}
}
Eif (canUseDOM) {
addBlurListener(window, onBlurWindow);
addFocusListener(window, onFocusWindow);
addKeyDownListener(document, onKeyDown);
addPointerDownListener(document, onPointerish);
addPointerMoveListener(document, onPointerish);
addVisibilityChangeListener(document, onVisibilityChange);
// fallbacks
addContextMenuListener(document, onPointerish);
addMouseDownListener(document, onPointerish);
addMouseMoveListener(document, onPointerish);
addMouseUpListener(document, onPointerish);
addTouchCancelListener(document, onPointerish);
addTouchMoveListener(document, onPointerish);
addTouchStartListener(document, onPointerish);
addSelectiomChangeListener(document, onPointerish);
addScrollListener(document, onPointerish);
}
function callListeners() {
const value = { activeModality, modality };
listeners.forEach((listener) => {
listener(value);
});
}
export function getActiveModality(): Modality {
return activeModality;
}
export function getModality(): Modality {
return modality;
}
export function addModalityListener(
listener: ({ activeModality: Modality, modality: Modality }) => void
): () => void {
listeners.add(listener);
return () => {
listeners.delete(listener);
};
}
export function testOnly_resetActiveModality() {
isEmulatingMouseEvents = false;
activeModality = KEYBOARD;
modality = KEYBOARD;
}
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