mirror of
https://github.com/EGroupware/egroupware.git
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301 lines
8.3 KiB
TypeScript
301 lines
8.3 KiB
TypeScript
/**
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* EGroupware TapAndSwipe helper library
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*
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* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
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* @package Api
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* @subpackage ui
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* @link https://www.egroupware.org
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* @author Hadi Nategh <hn@egroupware.org>
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*/
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export interface TapAndSwipeOptions {
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// allow scrolling would stop swipe/tap events from being fired when there's scrolling available. It can be restricted
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// to Vertical/Horizental/Both scrolling. If no value set it means not allowed.
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allowScrolling? : string|null,
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// tolorated pixel for tap event
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threshold? : number,
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// time delay for defirentiate between tap event and long tap event, threshold is in milliseconds
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tapHoldThreshold? : number,
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// DOM node(s) that event handler has to be bound to, it can be a selector or acctual HTMLElement
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element? : string|HTMLElement,
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// callback function being called on swipe gestures
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swipe? : Function,
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// callback function being called on tap
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tap? : Function,
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// callback function being called on long tap(tap and hold)
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tapAndHold? : Function,
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// tolerate pixel to fire swipe events
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minSwipeThreshold? : number,
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}
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export type TapAndSwipeOptionsType = TapAndSwipeOptions;
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export class tapAndSwipe {
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static readonly _default : TapAndSwipeOptionsType = {
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threshold : 5,
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tapHoldThreshold : 3000,
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minSwipeThreshold: 150,
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allowScrolling : 'both',
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swipe : function(){},
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tap : function(){},
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tapAndHold: function(){}
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}
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/**
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* Keeps the touch X start point
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* @private
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*/
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private _startX : number = null;
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/**
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* Keeps the touch Y start point
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* @private
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*/
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private _startY : number = null;
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/**
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* Keeps the touch X end point
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* @private
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*/
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private _endX : number = null;
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/**
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* Keeps the touch Y end point
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* @private
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*/
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private _endY : number = null;
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/**
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* keeps the distance travelled between startX point and endX point
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* @private
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*/
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private _distanceX : number = null;
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/**
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* keeps the distance travelled between startY point and endY point
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* @private
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*/
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private _distanceY : number = null;
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/**
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* flag to keep the status of type of tap
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* @private
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*/
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private _isTapAndHold : boolean = false;
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/**
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* keeps the timeout id for taphold
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*/
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private _tapHoldTimeout : number = null;
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/**
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* keeps the timeout id for tap
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*/
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private _tapTimeout : number = null;
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/**
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* keeps the contact point on touch start
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* @private
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*/
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private _fingercount : number = null;
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private _scrolledElementObj : {el : HTMLElement, scrollTop : number, scrollLeft : number} = null;
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private _hasBeenScrolled : boolean = false;
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private _scrollEventTriggered : boolean = false;
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private _stillMoving : boolean = false;
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/**
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* Options
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* @protected
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*/
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protected options : TapAndSwipeOptionsType = null;
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/**
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* Keeps the html node
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*/
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public element : HTMLElement = null;
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/**
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* Constructor
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* @param _element
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* @param _options
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*/
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public constructor(_element : string | HTMLElement, _options? : TapAndSwipeOptionsType)
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{
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this.options = {...tapAndSwipe._default, ..._options};
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const element = _element||_options.element;
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// Dont construct if the element is not there
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if (!element || !(typeof element != 'string' && element instanceof EventTarget)) return;
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this.element = (element instanceof EventTarget) ? element : document.querySelector(element);
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this.element.addEventListener('touchstart', this._onTouchStart.bind(this), false);
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this.element.addEventListener('touchend', this._ontouchEnd.bind(this), false);
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this.element.addEventListener('touchmove', this._onTouchMove.bind(this), false);
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this.element.addEventListener('touchcancel', this._onTouchCancel.bind(this), false);
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}
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_onScrolled(event)
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{
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this._scrollEventTriggered = true;
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}
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_onTouchCancel(event)
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{
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//cleanup tapHoldTimeout
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window.clearTimeout(this._tapHoldTimeout);
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//cleanup tapHoldTimeout
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window.clearTimeout(this._tapTimeout);
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}
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_onTouchMove(event)
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{
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this._stillMoving = true;
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}
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/**
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* on touch start event handler
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* @param event
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* @private
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*/
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private _onTouchStart(event : TouchEvent)
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{
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this._startX = event.changedTouches[0].pageX;
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this._startY = event.changedTouches[0].pageY;
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this._isTapAndHold = false;
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this._fingercount = event.touches.length;
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if(event.composedPath())
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{
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const scrolledItem = event.composedPath().filter(_item => {
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if (_item instanceof HTMLElement) _item.addEventListener('scroll', this._onScrolled.bind(this), false);
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return _item instanceof HTMLElement && this.element.contains(_item) && (_item.scrollTop != 0 || _item.scrollLeft !=0);
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});
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if (scrolledItem.length>0)
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{
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this._scrolledElementObj = {el: scrolledItem[0], scrollTop: scrolledItem[0].scrollTop, scrollLeft: scrolledItem[0].scrollLeft};
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}
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else
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{
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this._scrolledElementObj = null;
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}
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}
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this._tapHoldTimeout = window.setTimeout(_=>{
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this._isTapAndHold = true;
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//check scrolling
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if (this.options.allowScrolling && this._stillMoving)
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{
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return;
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}
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this.options.tapAndHold.call(this, event, this._fingercount);
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}, this.options.tapHoldThreshold);
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}
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/**
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* On touch end event handler
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* @param event
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* @private
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*/
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private _ontouchEnd(event : TouchEvent)
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{
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this._endX = event.changedTouches[0].pageX;
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this._endY = event.changedTouches[0].pageY;
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this._stillMoving = false;
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if (this._scrolledElementObj) {
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switch (this.options.allowScrolling)
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{
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case "vertical":
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this._hasBeenScrolled = this._scrolledElementObj.el.scrollTop != this._scrolledElementObj.scrollTop;
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break;
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case "horizental":
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this._hasBeenScrolled = this._scrolledElementObj.el.scrollLeft != this._scrolledElementObj.scrollLeft;
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break;
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case "both":
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this._hasBeenScrolled = (this._scrolledElementObj.el.scrollTop != this._scrolledElementObj.scrollTop) ||
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(this._scrolledElementObj.el.scrollLeft != this._scrolledElementObj.scrollLeft);
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break;
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default:
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this._hasBeenScrolled = false;
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}
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}
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else
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{
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this._hasBeenScrolled = false;
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}
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this._handler(event);
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}
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/**
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* Handles the type of gesture and calls the right callback for it
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* @param event
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* @private
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*/
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private _handler(event : TouchEvent)
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{
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//cleanup tapHoldTimeout
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window.clearTimeout(this._tapHoldTimeout);
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this._distanceX = Math.abs(this._endX-this._startX);
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this._distanceY = Math.abs(this._endY-this._startY);
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const isTabOrHold = (this._endX == this._startX && this._endY == this._startY
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|| (Math.sqrt((this._distanceX)*(this._distanceX) + (this._distanceY*2))
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< this.options.threshold));
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this._hasBeenScrolled = this._hasBeenScrolled ?? (!isTabOrHold && this._scrollEventTriggered);
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//check scrolling
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if (this.options.allowScrolling && this._hasBeenScrolled)
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{
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// let the scrolling happens
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return;
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}
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// Tap & TapAndHold handler
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if (isTabOrHold)
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{
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if (!this._isTapAndHold)
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{
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this._tapTimeout = window.setTimeout(_=> {
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this.options.tap.call(this,event, this._fingercount);
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}, 100);
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}
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return;
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}
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// left swipe handler
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if (this._endX + this.options.threshold < this._startX && this._distanceX > this._distanceY) {
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if (this._distanceX < this.options.minSwipeThreshold) return;
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this.options.swipe.call(this, event, 'left', this._distanceX, this._fingercount);
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return;
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}
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// right swipe handler
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if (this._endX - this.options.threshold > this._startX && this._distanceX > this._distanceY) {
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if (this._distanceX < this.options.minSwipeThreshold) return;
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this.options.swipe.call(this, event, 'right', this._distanceX, this._fingercount);
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return;
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}
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// up swipe handler
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if (this._endY + this.options.threshold < this._startY && this._distanceY > this._distanceX) {
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if (this._distanceY < this.options.minSwipeThreshold) return;
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this.options.swipe.call(this, event, 'up', this._distanceY, this._fingercount);
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return;
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}
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// down swipe handler
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if (this._endY - this.options.threshold > this._startY && this._distanceY > this._distanceX) {
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if (this._distanceY < this.options.minSwipeThreshold) return;
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this.options.swipe.call(this, event, 'down', this._distanceY, this._fingercount);
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return;
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}
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}
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/**
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* destroy the event listeners
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*/
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public destroy()
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{
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this.element.removeEventListener('touchstart', this._onTouchStart);
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this.element.removeEventListener('touchend', this._ontouchEnd);
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this.element.removeEventListener('touchcancel', this._onTouchCancel);
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}
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} |