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* @module Utils
*/
import * as MC from "@lisn/globals/minification-constants";
import * as MH from "@lisn/globals/minification-helpers";
import { Direction, GestureIntent, Vector } from "@lisn/globals/types";
import { getVectorDirection } from "@lisn/utils/directions";
import {
maxAbs,
havingMaxAbs,
distanceBetween,
areAntiParallel,
} from "@lisn/utils/math";
import { GestureFragment } from "@lisn/utils/gesture";
import { newXMap } from "@lisn/modules/x-map";
/**
* @category Gestures
*/
export type TouchDiff = {
startX: number;
startY: number;
endX: number;
endY: number;
deltaX: number;
deltaY: number;
isSignificant: boolean;
};
/**
* Returns a {@link GestureFragment} for the given events. Only "touchmove" events
* will be considered.
*
* If there are less than 2 such events in the given list of events, returns `false`.
*
* If the gesture is to be considered terminated, e.g. because there is
* "touchcancel" in the list, returns `null`.
*
* Note that by default swipe actions follow the natural direction: swipe up
* with scroll intent results in direction down and swipe down results in
* direction up. Drag intent always follows the direction of the gesture.
*
* For zoom intents, which necessarily involves exactly two fingers `deltaZ`
* is based on the relative change in distance between the fingers.
*
* @param [options.deltaThreshold]
* A change of x or y coordinate less than this is
* considered insignificant, for the purposes of
* determining:
* 1) whether the inferred direction is in one of the
* four cardinal ones, or otherwise ambiguous; and
* 2) whether more than two fingers have moved and
* therefore whether the direction could be zoom or
* not
* @param [options.angleDiffThreshold] See {@link getVectorDirection}
* @param [options.reverseScroll]
* If set to `true`, will disable natural scroll
* direction.
* @param [options.dragHoldTime]
* If the user presses and holds for at least the
* given amount of milliseconds before moving the
* finger(s), gestures other than pinch will be
* treated as a drag instead of scroll as long as the
* number of fingers touching the screen is
* `options.dragNumFingers`. Default is 500ms.
* @param [options.dragNumFingers]
* The number of fingers that could be considered a
* drag intent. Default is 1.
*
* @returns `false` if there are less than 2 "touchmove" events in the list,
* `null` if the gesture is terminated, otherwise a {@link GestureFragment}.
*
* @category Gestures
*/
export const getTouchGestureFragment = (
events: Event[],
options?: {
deltaThreshold?: number;
angleDiffThreshold?: number;
reverseScroll?: boolean;
dragHoldTime?: number;
dragNumFingers?: number;
},
): GestureFragment | null | false => {
Iif (!MH.isIterableObject(events)) {
events = [events];
}
let moves = getTouchDiff(events, options?.deltaThreshold);
if (!moves) {
return null; // terminated
}
let numMoves = MH.lengthOf(moves);
const holdTime = getHoldTime(events);
const canBeDrag =
holdTime >= (options?.dragHoldTime ?? 500) &&
numMoves === (options?.dragNumFingers ?? 1);
const angleDiffThreshold = options?.angleDiffThreshold;
let deltaX = havingMaxAbs(...moves.map((m) => m.deltaX));
let deltaY = havingMaxAbs(...moves.map((m) => m.deltaY));
let deltaZ = 1;
if (numMoves > 2) {
// Take only the significant ones
moves = MH.filter(moves, (d) => d.isSignificant);
numMoves = MH.lengthOf(moves);
}
let direction: Direction = MC.S_NONE;
let intent: GestureIntent = MC.S_UNKNOWN;
if (numMoves === 2) {
// Check if it's a zoom
const vectorA: Vector = [moves[0].deltaX, moves[0].deltaY];
const vectorB: Vector = [moves[1].deltaX, moves[1].deltaY];
// If either finger is approx stationary, or if they move in opposite directions,
// treat it as zoom.
if (
!havingMaxAbs(...vectorA) || // finger A still
!havingMaxAbs(...vectorB) || // finger B still
areAntiParallel(vectorA, vectorB, angleDiffThreshold)
) {
// It's a pinch motion => zoom
const startDistance = distanceBetween(
[moves[0].startX, moves[0].startY],
[moves[1].startX, moves[1].startY],
);
const endDistance = distanceBetween(
[moves[0].endX, moves[0].endY],
[moves[1].endX, moves[1].endY],
);
direction = startDistance < endDistance ? MC.S_IN : MC.S_OUT;
deltaZ = endDistance / startDistance;
deltaX = deltaY = 0;
intent = MC.S_ZOOM;
}
}
const deltaSign = canBeDrag || options?.reverseScroll ? 1 : -1;
// If scrolling, swap the deltas for natural scroll direction.
// Add +0 to force -0 to be +0 since jest doesn't think they're equal
deltaX = deltaSign * deltaX + 0;
deltaY = deltaSign * deltaY + 0;
if (direction === MC.S_NONE) {
// Wasn't a zoom. Check if all moves are aligned.
let isFirst = true;
for (const m of moves) {
// There's at least one significant move, assume scroll or drag intent.
intent = canBeDrag ? MC.S_DRAG : MC.S_SCROLL;
const thisDirection = getVectorDirection(
[deltaSign * m.deltaX, deltaSign * m.deltaY],
angleDiffThreshold,
);
if (thisDirection === MC.S_NONE) {
continue;
}
if (isFirst) {
direction = thisDirection;
} else if (direction !== thisDirection) {
direction = MC.S_AMBIGUOUS;
break;
}
isFirst = false;
}
}
if (direction === MC.S_NONE) {
const lastTouchEvent = MH.lastOf(events.filter(MH.isTouchEvent));
// If all fingers have lifted off, consider it terminated, otherwise wait
// for more events.
return MH.lengthOf(lastTouchEvent?.touches) ? false : null;
}
return {
device: MC.S_TOUCH,
direction,
intent,
deltaX,
deltaY,
deltaZ,
};
};
/**
* Returns a description of the changes in each finger between the first and
* the last relevant TouchEvent in the list.
*
* If the gesture is to be considered terminated, e.g. because there is
* "touchcancel" in the list, returns `null`.
*
* Note that, `deltaX`/`deltaY` are the end X/Y coordinate minus the start X/Y
* coordinate. For natural scroll direction you should swap their signs.
*
* @param deltaThreshold If the change of x and y coordinate are both less
* than this, it is marked as not significant.
*
* @category Gestures
*/
export const getTouchDiff = (
events: Event[],
deltaThreshold = 0,
): TouchDiff[] | null => {
// Group each touch point of each event by identifier, so that we can get the
// start and end coordinate of each finger
const groupedTouches = newXMap<number, Touch[]>((): Touch[] => []);
for (const event of events) {
if (!MH.isTouchEvent(event)) {
continue;
}
if (event.type === MC.S_TOUCHCANCEL) {
return null; // gesture terminated
}
for (const touch of event.touches) {
groupedTouches.sGet(touch.identifier).push(touch);
}
}
const moves: TouchDiff[] = [];
for (const touchList of groupedTouches.values()) {
const nTouches = MH.lengthOf(touchList);
if (nTouches < 2) {
// Only one event had that finger in it, so there's no move for it
continue;
}
const firstTouch = touchList[0];
const lastTouch = touchList[nTouches - 1];
const startX = firstTouch.clientX;
const startY = firstTouch.clientY;
const endX = lastTouch.clientX;
const endY = lastTouch.clientY;
const deltaX = endX - startX;
const deltaY = endY - startY;
const isSignificant = maxAbs(deltaX, deltaY) >= deltaThreshold;
// Consider it a move in one of the 4 cardinal ones
moves.push({
startX,
startY,
endX,
endY,
deltaX,
deltaY,
isSignificant,
});
}
return moves;
};
// --------------------
const getHoldTime = (events: Event[]) => {
const firstStart = events.findIndex((e) => e.type === MC.S_TOUCHSTART);
const firstMove = events.findIndex((e) => e.type === MC.S_TOUCHMOVE);
if (firstStart < 0 || firstMove < 1) {
return 0;
}
return events[firstMove].timeStamp - events[firstStart].timeStamp;
};
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