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Viewing file:     touch-events.js (11.89 KB)      -rwxrwxr-x

function getLen(v) {
    return Math.sqrt(v.x * v.x + v.y * v.y);
}

function dot(v1, v2) {
    return v1.x * v2.x + v1.y * v2.y;
}

function getAngle(v1, v2) {
    var mr = getLen(v1) * getLen(v2);
    if (mr === 0) {
        return 0;
    }
    var r = dot(v1, v2) / mr;
    if (r > 1) {
        r = 1;
    }
    return Math.acos(r);
}

function cross(v1, v2) {
    return v1.x * v2.y - v2.x * v1.y;
}

function getRotateAngle(v1, v2) {
    var angle = getAngle(v1, v2);
    if (cross(v1, v2) > 0) {
        angle *= -1;
    }

    return (angle * 180) / Math.PI;
}

class EventsHandlerAdmin {
    constructor(el) {
        this.handlers = [];
        this.el = el;
    }
    add(handler) {
        this.handlers.push(handler);
    }
    del(handler) {
        if (!handler) {
            this.handlers = [];
        }

        for (var i = this.handlers.length; i >= 0; i--) {
            if (this.handlers[i] === handler) {
                this.handlers.splice(i, 1);
            }
        }
    }
    dispatch() {
        for (var i = 0, len = this.handlers.length; i < len; i++) {
            var handler = this.handlers[i];
            if (typeof handler === 'function') {
                handler.apply(this.el, arguments);
            }
        }
    }
}

function wrapFunc(el, handler) {
    var EventshandlerAdmin = new EventsHandlerAdmin(el);
    EventshandlerAdmin.add(handler);

    return EventshandlerAdmin;
}

// Modified version of AlloyFinger
export default class TouchEvents {
    constructor(el, option) {
        this.element = typeof el == 'string' ? document.querySelector(el) : el;

        this.start = this.start.bind(this);
        this.move = this.move.bind(this);
        this.end = this.end.bind(this);
        this.cancel = this.cancel.bind(this);
        this.element.addEventListener('touchstart', this.start, false);
        this.element.addEventListener('touchmove', this.move, false);
        this.element.addEventListener('touchend', this.end, false);
        this.element.addEventListener('touchcancel', this.cancel, false);

        this.preV = { x: null, y: null };
        this.pinchStartLen = null;
        this.zoom = 1;
        this.isDoubleTap = false;

        var noop = function () {};

        this.rotate = wrapFunc(this.element, option.rotate || noop);
        this.touchStart = wrapFunc(this.element, option.touchStart || noop);
        this.multipointStart = wrapFunc(this.element, option.multipointStart || noop);
        this.multipointEnd = wrapFunc(this.element, option.multipointEnd || noop);
        this.pinch = wrapFunc(this.element, option.pinch || noop);
        this.swipe = wrapFunc(this.element, option.swipe || noop);
        this.tap = wrapFunc(this.element, option.tap || noop);
        this.doubleTap = wrapFunc(this.element, option.doubleTap || noop);
        this.longTap = wrapFunc(this.element, option.longTap || noop);
        this.singleTap = wrapFunc(this.element, option.singleTap || noop);
        this.pressMove = wrapFunc(this.element, option.pressMove || noop);
        this.twoFingerPressMove = wrapFunc(this.element, option.twoFingerPressMove || noop);
        this.touchMove = wrapFunc(this.element, option.touchMove || noop);
        this.touchEnd = wrapFunc(this.element, option.touchEnd || noop);
        this.touchCancel = wrapFunc(this.element, option.touchCancel || noop);
        this.translateContainer = this.element;

        this._cancelAllHandler = this.cancelAll.bind(this);

        window.addEventListener('scroll', this._cancelAllHandler);

        this.delta = null;
        this.last = null;
        this.now = null;
        this.tapTimeout = null;
        this.singleTapTimeout = null;
        this.longTapTimeout = null;
        this.swipeTimeout = null;
        this.x1 = this.x2 = this.y1 = this.y2 = null;
        this.preTapPosition = { x: null, y: null };
    }
    start(evt) {
        if (!evt.touches) {
            return;
        }

        // Fix Media Buttons Not responding on Android #233
        const ignoreDragFor = ['a', 'button', 'input'];
        if (evt.target && evt.target.nodeName && ignoreDragFor.indexOf(evt.target.nodeName.toLowerCase()) >= 0) {
            console.log('ignore drag for this touched element', evt.target.nodeName.toLowerCase());
            return;
        }

        this.now = Date.now();
        this.x1 = evt.touches[0].pageX;
        this.y1 = evt.touches[0].pageY;
        this.delta = this.now - (this.last || this.now);
        this.touchStart.dispatch(evt, this.element);
        if (this.preTapPosition.x !== null) {
            this.isDoubleTap = this.delta > 0 && this.delta <= 250 && Math.abs(this.preTapPosition.x - this.x1) < 30 && Math.abs(this.preTapPosition.y - this.y1) < 30;
            if (this.isDoubleTap) {
                clearTimeout(this.singleTapTimeout);
            }
        }
        this.preTapPosition.x = this.x1;
        this.preTapPosition.y = this.y1;
        this.last = this.now;
        var preV = this.preV,
            len = evt.touches.length;
        if (len > 1) {
            this._cancelLongTap();
            this._cancelSingleTap();
            var v = { x: evt.touches[1].pageX - this.x1, y: evt.touches[1].pageY - this.y1 };
            preV.x = v.x;
            preV.y = v.y;
            this.pinchStartLen = getLen(preV);
            this.multipointStart.dispatch(evt, this.element);
        }
        this._preventTap = false;
        this.longTapTimeout = setTimeout(
            function () {
                this.longTap.dispatch(evt, this.element);
                this._preventTap = true;
            }.bind(this),
            750
        );
    }
    move(evt) {
        if (!evt.touches) {
            return;
        }
        var preV = this.preV,
            len = evt.touches.length,
            currentX = evt.touches[0].pageX,
            currentY = evt.touches[0].pageY;
        this.isDoubleTap = false;
        if (len > 1) {
            var sCurrentX = evt.touches[1].pageX,
                sCurrentY = evt.touches[1].pageY;
            var v = { x: evt.touches[1].pageX - currentX, y: evt.touches[1].pageY - currentY };

            if (preV.x !== null) {
                if (this.pinchStartLen > 0) {
                    evt.zoom = getLen(v) / this.pinchStartLen;
                    this.pinch.dispatch(evt, this.element);
                }

                evt.angle = getRotateAngle(v, preV);
                this.rotate.dispatch(evt, this.element);
            }
            preV.x = v.x;
            preV.y = v.y;

            if (this.x2 !== null && this.sx2 !== null) {
                evt.deltaX = (currentX - this.x2 + sCurrentX - this.sx2) / 2;
                evt.deltaY = (currentY - this.y2 + sCurrentY - this.sy2) / 2;
            } else {
                evt.deltaX = 0;
                evt.deltaY = 0;
            }
            this.twoFingerPressMove.dispatch(evt, this.element);

            this.sx2 = sCurrentX;
            this.sy2 = sCurrentY;
        } else {
            if (this.x2 !== null) {
                evt.deltaX = currentX - this.x2;
                evt.deltaY = currentY - this.y2;

                var movedX = Math.abs(this.x1 - this.x2),
                    movedY = Math.abs(this.y1 - this.y2);

                if (movedX > 10 || movedY > 10) {
                    this._preventTap = true;
                }
            } else {
                evt.deltaX = 0;
                evt.deltaY = 0;
            }
            this.pressMove.dispatch(evt, this.element);
        }

        this.touchMove.dispatch(evt, this.element);

        this._cancelLongTap();
        this.x2 = currentX;
        this.y2 = currentY;

        if (len > 1) {
            evt.preventDefault();
        }
    }
    end(evt) {
        if (!evt.changedTouches) {
            return;
        }
        this._cancelLongTap();
        var self = this;
        if (evt.touches.length < 2) {
            this.multipointEnd.dispatch(evt, this.element);
            this.sx2 = this.sy2 = null;
        }

        //swipe
        if ((this.x2 && Math.abs(this.x1 - this.x2) > 30) || (this.y2 && Math.abs(this.y1 - this.y2) > 30)) {
            evt.direction = this._swipeDirection(this.x1, this.x2, this.y1, this.y2);
            this.swipeTimeout = setTimeout(function () {
                self.swipe.dispatch(evt, self.element);
            }, 0);
        } else {
            this.tapTimeout = setTimeout(function () {
                if (!self._preventTap) {
                    self.tap.dispatch(evt, self.element);
                }
                // trigger double tap immediately
                if (self.isDoubleTap) {
                    self.doubleTap.dispatch(evt, self.element);
                    self.isDoubleTap = false;
                }
            }, 0);

            if (!self.isDoubleTap) {
                self.singleTapTimeout = setTimeout(function () {
                    self.singleTap.dispatch(evt, self.element);
                }, 250);
            }
        }

        this.touchEnd.dispatch(evt, this.element);

        this.preV.x = 0;
        this.preV.y = 0;
        this.zoom = 1;
        this.pinchStartLen = null;
        this.x1 = this.x2 = this.y1 = this.y2 = null;
    }
    cancelAll() {
        this._preventTap = true;
        clearTimeout(this.singleTapTimeout);
        clearTimeout(this.tapTimeout);
        clearTimeout(this.longTapTimeout);
        clearTimeout(this.swipeTimeout);
    }
    cancel(evt) {
        this.cancelAll();
        this.touchCancel.dispatch(evt, this.element);
    }
    _cancelLongTap() {
        clearTimeout(this.longTapTimeout);
    }
    _cancelSingleTap() {
        clearTimeout(this.singleTapTimeout);
    }
    _swipeDirection(x1, x2, y1, y2) {
        return Math.abs(x1 - x2) >= Math.abs(y1 - y2) ? (x1 - x2 > 0 ? 'Left' : 'Right') : y1 - y2 > 0 ? 'Up' : 'Down';
    }
    on(evt, handler) {
        if (this[evt]) {
            this[evt].add(handler);
        }
    }
    off(evt, handler) {
        if (this[evt]) {
            this[evt].del(handler);
        }
    }
    destroy() {
        if (this.singleTapTimeout) {
            clearTimeout(this.singleTapTimeout);
        }
        if (this.tapTimeout) {
            clearTimeout(this.tapTimeout);
        }
        if (this.longTapTimeout) {
            clearTimeout(this.longTapTimeout);
        }
        if (this.swipeTimeout) {
            clearTimeout(this.swipeTimeout);
        }

        this.element.removeEventListener('touchstart', this.start);
        this.element.removeEventListener('touchmove', this.move);
        this.element.removeEventListener('touchend', this.end);
        this.element.removeEventListener('touchcancel', this.cancel);

        this.rotate.del();
        this.touchStart.del();
        this.multipointStart.del();
        this.multipointEnd.del();
        this.pinch.del();
        this.swipe.del();
        this.tap.del();
        this.doubleTap.del();
        this.longTap.del();
        this.singleTap.del();
        this.pressMove.del();
        this.twoFingerPressMove.del();
        this.touchMove.del();
        this.touchEnd.del();
        this.touchCancel.del();

        this.preV =
            this.pinchStartLen =
            this.zoom =
            this.isDoubleTap =
            this.delta =
            this.last =
            this.now =
            this.tapTimeout =
            this.singleTapTimeout =
            this.longTapTimeout =
            this.swipeTimeout =
            this.x1 =
            this.x2 =
            this.y1 =
            this.y2 =
            this.preTapPosition =
            this.rotate =
            this.touchStart =
            this.multipointStart =
            this.multipointEnd =
            this.pinch =
            this.swipe =
            this.tap =
            this.doubleTap =
            this.longTap =
            this.singleTap =
            this.pressMove =
            this.touchMove =
            this.touchEnd =
            this.touchCancel =
            this.twoFingerPressMove =
                null;

        window.removeEventListener('scroll', this._cancelAllHandler);
        return null;
    }
}