@larva.io/webcomponents
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Fentrica SmartUnits WebComponents package
631 lines (625 loc) • 18.5 kB
JavaScript
/*!
* (C) Fentrica http://fentrica.com - Seee LICENSE.md
*/
class GestureController {
constructor() {
this.gestureId = 0;
this.requestedStart = new Map();
this.disabledGestures = new Map();
this.disabledScroll = new Set();
}
/**
* Creates a gesture delegate based on the GestureConfig passed
*/
createGesture(config) {
return new GestureDelegate(this, this.newID(), config.name, config.priority || 0, !!config.disableScroll);
}
/**
* Creates a blocker that will block any other gesture events from firing. Set in the ion-gesture component.
*/
createBlocker(opts = {}) {
return new BlockerDelegate(this, this.newID(), opts.disable, !!opts.disableScroll);
}
start(gestureName, id, priority) {
if (!this.canStart(gestureName)) {
this.requestedStart.delete(id);
return false;
}
this.requestedStart.set(id, priority);
return true;
}
capture(gestureName, id, priority) {
if (!this.start(gestureName, id, priority)) {
return false;
}
const requestedStart = this.requestedStart;
let maxPriority = -1e4;
requestedStart.forEach(value => {
maxPriority = Math.max(maxPriority, value);
});
if (maxPriority === priority) {
this.capturedId = id;
requestedStart.clear();
const event = new CustomEvent('ionGestureCaptured', { detail: { gestureName } });
document.dispatchEvent(event);
return true;
}
requestedStart.delete(id);
return false;
}
release(id) {
this.requestedStart.delete(id);
if (this.capturedId === id) {
this.capturedId = undefined;
}
}
disableGesture(gestureName, id) {
let set = this.disabledGestures.get(gestureName);
if (set === undefined) {
set = new Set();
this.disabledGestures.set(gestureName, set);
}
set.add(id);
}
enableGesture(gestureName, id) {
const set = this.disabledGestures.get(gestureName);
if (set !== undefined) {
set.delete(id);
}
}
disableScroll(id) {
this.disabledScroll.add(id);
if (this.disabledScroll.size === 1) {
document.body.classList.add(BACKDROP_NO_SCROLL);
}
}
enableScroll(id) {
this.disabledScroll.delete(id);
if (this.disabledScroll.size === 0) {
document.body.classList.remove(BACKDROP_NO_SCROLL);
}
}
canStart(gestureName) {
if (this.capturedId !== undefined) {
// a gesture already captured
return false;
}
if (this.isDisabled(gestureName)) {
return false;
}
return true;
}
isCaptured() {
return this.capturedId !== undefined;
}
isScrollDisabled() {
return this.disabledScroll.size > 0;
}
isDisabled(gestureName) {
const disabled = this.disabledGestures.get(gestureName);
if (disabled && disabled.size > 0) {
return true;
}
return false;
}
newID() {
this.gestureId++;
return this.gestureId;
}
}
class GestureDelegate {
constructor(ctrl, id, name, priority, disableScroll) {
this.id = id;
this.name = name;
this.disableScroll = disableScroll;
this.priority = priority * 1000000 + id;
this.ctrl = ctrl;
}
canStart() {
if (!this.ctrl) {
return false;
}
return this.ctrl.canStart(this.name);
}
start() {
if (!this.ctrl) {
return false;
}
return this.ctrl.start(this.name, this.id, this.priority);
}
capture() {
if (!this.ctrl) {
return false;
}
const captured = this.ctrl.capture(this.name, this.id, this.priority);
if (captured && this.disableScroll) {
this.ctrl.disableScroll(this.id);
}
return captured;
}
release() {
if (this.ctrl) {
this.ctrl.release(this.id);
if (this.disableScroll) {
this.ctrl.enableScroll(this.id);
}
}
}
destroy() {
this.release();
this.ctrl = undefined;
}
}
class BlockerDelegate {
constructor(ctrl, id, disable, disableScroll) {
this.id = id;
this.disable = disable;
this.disableScroll = disableScroll;
this.ctrl = ctrl;
}
block() {
if (!this.ctrl) {
return;
}
if (this.disable) {
for (const gesture of this.disable) {
this.ctrl.disableGesture(gesture, this.id);
}
}
if (this.disableScroll) {
this.ctrl.disableScroll(this.id);
}
}
unblock() {
if (!this.ctrl) {
return;
}
if (this.disable) {
for (const gesture of this.disable) {
this.ctrl.enableGesture(gesture, this.id);
}
}
if (this.disableScroll) {
this.ctrl.enableScroll(this.id);
}
}
destroy() {
this.unblock();
this.ctrl = undefined;
}
}
const BACKDROP_NO_SCROLL = 'backdrop-no-scroll';
const GESTURE_CONTROLLER = new GestureController();
const addEventListener = (el, eventName, callback, opts) => {
// use event listener options when supported
// otherwise it's just a boolean for the "capture" arg
const listenerOpts = supportsPassive(el) ? {
'capture': false,
'passive': !!opts.passive,
} : false;
let add;
let remove;
if (el['__zone_symbol__addEventListener']) {
add = '__zone_symbol__addEventListener';
remove = '__zone_symbol__removeEventListener';
}
else {
add = 'addEventListener';
remove = 'removeEventListener';
}
el[add](eventName, callback, listenerOpts);
return () => {
el[remove](eventName, callback, listenerOpts);
};
};
const supportsPassive = (node) => {
if (_sPassive === undefined) {
try {
const opts = Object.defineProperty({}, 'passive', {
get: () => {
_sPassive = true;
}
});
node.addEventListener('optsTest', () => { return; }, opts);
}
catch (e) {
_sPassive = false;
}
}
return !!_sPassive;
};
let _sPassive;
const MOUSE_WAIT = 2000;
const createPointerEvents = (el, pointerDown, pointerMove, pointerUp, options) => {
let rmTouchStart;
let rmTouchMove;
let rmTouchEnd;
let rmTouchCancel;
let rmMouseStart;
let rmMouseMove;
let rmMouseUp;
let lastTouchEvent = 0;
const handleTouchStart = (ev) => {
lastTouchEvent = Date.now() + MOUSE_WAIT;
if (!pointerDown(ev)) {
return;
}
if (!rmTouchMove && pointerMove) {
rmTouchMove = addEventListener(el, 'touchmove', pointerMove, options);
}
if (!rmTouchEnd) {
rmTouchEnd = addEventListener(el, 'touchend', handleTouchEnd, options);
}
if (!rmTouchCancel) {
rmTouchCancel = addEventListener(el, 'touchcancel', handleTouchEnd, options);
}
};
const handleMouseDown = (ev) => {
if (lastTouchEvent > Date.now()) {
return;
}
if (!pointerDown(ev)) {
return;
}
if (!rmMouseMove && pointerMove) {
rmMouseMove = addEventListener(getDocument(el), 'mousemove', pointerMove, options);
}
if (!rmMouseUp) {
rmMouseUp = addEventListener(getDocument(el), 'mouseup', handleMouseUp, options);
}
};
const handleTouchEnd = (ev) => {
stopTouch();
if (pointerUp) {
pointerUp(ev);
}
};
const handleMouseUp = (ev) => {
stopMouse();
if (pointerUp) {
pointerUp(ev);
}
};
const stopTouch = () => {
if (rmTouchMove) {
rmTouchMove();
}
if (rmTouchEnd) {
rmTouchEnd();
}
if (rmTouchCancel) {
rmTouchCancel();
}
rmTouchMove = rmTouchEnd = rmTouchCancel = undefined;
};
const stopMouse = () => {
if (rmMouseMove) {
rmMouseMove();
}
if (rmMouseUp) {
rmMouseUp();
}
rmMouseMove = rmMouseUp = undefined;
};
const stop = () => {
stopTouch();
stopMouse();
};
const enable = (isEnabled = true) => {
if (!isEnabled) {
if (rmTouchStart) {
rmTouchStart();
}
if (rmMouseStart) {
rmMouseStart();
}
rmTouchStart = rmMouseStart = undefined;
stop();
}
else {
if (!rmTouchStart) {
rmTouchStart = addEventListener(el, 'touchstart', handleTouchStart, options);
}
if (!rmMouseStart) {
rmMouseStart = addEventListener(el, 'mousedown', handleMouseDown, options);
}
}
};
const destroy = () => {
enable(false);
pointerUp = pointerMove = pointerDown = undefined;
};
return {
enable,
stop,
destroy
};
};
const getDocument = (node) => {
return node instanceof Document ? node : node.ownerDocument;
};
const createPanRecognizer = (direction, thresh, maxAngle) => {
const radians = maxAngle * (Math.PI / 180);
const isDirX = direction === 'x';
const maxCosine = Math.cos(radians);
const threshold = thresh * thresh;
let startX = 0;
let startY = 0;
let dirty = false;
let isPan = 0;
return {
start(x, y) {
startX = x;
startY = y;
isPan = 0;
dirty = true;
},
detect(x, y) {
if (!dirty) {
return false;
}
const deltaX = (x - startX);
const deltaY = (y - startY);
const distance = deltaX * deltaX + deltaY * deltaY;
if (distance < threshold) {
return false;
}
const hypotenuse = Math.sqrt(distance);
const cosine = (isDirX ? deltaX : deltaY) / hypotenuse;
if (cosine > maxCosine) {
isPan = 1;
}
else if (cosine < -maxCosine) {
isPan = -1;
}
else {
isPan = 0;
}
dirty = false;
return true;
},
isGesture() {
return isPan !== 0;
},
getDirection() {
return isPan;
}
};
};
const createGesture = (config) => {
let hasCapturedPan = false;
let hasStartedPan = false;
let hasFiredStart = true;
let isMoveQueued = false;
const finalConfig = Object.assign({ disableScroll: false, direction: 'x', gesturePriority: 0, passive: true, maxAngle: 40, threshold: 10 }, config);
const canStart = finalConfig.canStart;
const onWillStart = finalConfig.onWillStart;
const onStart = finalConfig.onStart;
const onEnd = finalConfig.onEnd;
const notCaptured = finalConfig.notCaptured;
const onMove = finalConfig.onMove;
const threshold = finalConfig.threshold;
const passive = finalConfig.passive;
const blurOnStart = finalConfig.blurOnStart;
const detail = {
type: 'pan',
startX: 0,
startY: 0,
startTime: 0,
currentX: 0,
currentY: 0,
velocityX: 0,
velocityY: 0,
deltaX: 0,
deltaY: 0,
currentTime: 0,
event: undefined,
data: undefined
};
const pan = createPanRecognizer(finalConfig.direction, finalConfig.threshold, finalConfig.maxAngle);
const gesture = GESTURE_CONTROLLER.createGesture({
name: config.gestureName,
priority: config.gesturePriority,
disableScroll: config.disableScroll
});
const pointerDown = (ev) => {
const timeStamp = now(ev);
if (hasStartedPan || !hasFiredStart) {
return false;
}
updateDetail(ev, detail);
detail.startX = detail.currentX;
detail.startY = detail.currentY;
detail.startTime = detail.currentTime = timeStamp;
detail.velocityX = detail.velocityY = detail.deltaX = detail.deltaY = 0;
detail.event = ev;
// Check if gesture can start
if (canStart && canStart(detail) === false) {
return false;
}
// Release fallback
gesture.release();
// Start gesture
if (!gesture.start()) {
return false;
}
hasStartedPan = true;
if (threshold === 0) {
return tryToCapturePan();
}
pan.start(detail.startX, detail.startY);
return true;
};
const pointerMove = (ev) => {
// fast path, if gesture is currently captured
// do minimum job to get user-land even dispatched
if (hasCapturedPan) {
if (!isMoveQueued && hasFiredStart) {
isMoveQueued = true;
calcGestureData(detail, ev);
requestAnimationFrame(fireOnMove);
}
return;
}
// gesture is currently being detected
calcGestureData(detail, ev);
if (pan.detect(detail.currentX, detail.currentY)) {
if (!pan.isGesture() || !tryToCapturePan()) {
abortGesture();
}
}
};
const fireOnMove = () => {
// Since fireOnMove is called inside a RAF, onEnd() might be called,
// we must double check hasCapturedPan
if (!hasCapturedPan) {
return;
}
isMoveQueued = false;
if (onMove) {
onMove(detail);
}
};
const tryToCapturePan = () => {
if (gesture && !gesture.capture()) {
return false;
}
hasCapturedPan = true;
hasFiredStart = false;
// reset start position since the real user-land event starts here
// If the pan detector threshold is big, not resetting the start position
// will cause a jump in the animation equal to the detector threshold.
// the array of positions used to calculate the gesture velocity does not
// need to be cleaned, more points in the positions array always results in a
// more accurate value of the velocity.
detail.startX = detail.currentX;
detail.startY = detail.currentY;
detail.startTime = detail.currentTime;
if (onWillStart) {
onWillStart(detail).then(fireOnStart);
}
else {
fireOnStart();
}
return true;
};
const blurActiveElement = () => {
/* tslint:disable-next-line */
if (typeof document !== 'undefined') {
const activeElement = document.activeElement;
if (activeElement !== null && activeElement.blur) {
activeElement.blur();
}
}
};
const fireOnStart = () => {
if (blurOnStart) {
blurActiveElement();
}
if (onStart) {
onStart(detail);
}
hasFiredStart = true;
};
const reset = () => {
hasCapturedPan = false;
hasStartedPan = false;
isMoveQueued = false;
hasFiredStart = true;
gesture.release();
};
// END *************************
const pointerUp = (ev) => {
const tmpHasCaptured = hasCapturedPan;
const tmpHasFiredStart = hasFiredStart;
reset();
if (!tmpHasFiredStart) {
return;
}
calcGestureData(detail, ev);
// Try to capture press
if (tmpHasCaptured) {
if (onEnd) {
onEnd(detail);
}
return;
}
// Not captured any event
if (notCaptured) {
notCaptured(detail);
}
};
const pointerEvents = createPointerEvents(finalConfig.el, pointerDown, pointerMove, pointerUp, {
passive
});
const abortGesture = () => {
reset();
pointerEvents.stop();
if (notCaptured) {
notCaptured(detail);
}
};
return {
enable(enable = true) {
if (!enable) {
if (hasCapturedPan) {
pointerUp(undefined);
}
reset();
}
pointerEvents.enable(enable);
},
destroy() {
gesture.destroy();
pointerEvents.destroy();
}
};
};
const calcGestureData = (detail, ev) => {
if (!ev) {
return;
}
const prevX = detail.currentX;
const prevY = detail.currentY;
const prevT = detail.currentTime;
updateDetail(ev, detail);
const currentX = detail.currentX;
const currentY = detail.currentY;
const timestamp = detail.currentTime = now(ev);
const timeDelta = timestamp - prevT;
if (timeDelta > 0 && timeDelta < 100) {
const velocityX = (currentX - prevX) / timeDelta;
const velocityY = (currentY - prevY) / timeDelta;
detail.velocityX = velocityX * 0.7 + detail.velocityX * 0.3;
detail.velocityY = velocityY * 0.7 + detail.velocityY * 0.3;
}
detail.deltaX = currentX - detail.startX;
detail.deltaY = currentY - detail.startY;
detail.event = ev;
};
const updateDetail = (ev, detail) => {
// get X coordinates for either a mouse click
// or a touch depending on the given event
let x = 0;
let y = 0;
if (ev) {
const changedTouches = ev.changedTouches;
if (changedTouches && changedTouches.length > 0) {
const touch = changedTouches[0];
x = touch.clientX;
y = touch.clientY;
}
else if (ev.pageX !== undefined) {
x = ev.pageX;
y = ev.pageY;
}
}
detail.currentX = x;
detail.currentY = y;
};
const now = (ev) => {
return ev.timeStamp || Date.now();
};
export { GESTURE_CONTROLLER, createGesture };
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