122 lines
2.8 KiB
JavaScript
122 lines
2.8 KiB
JavaScript
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goog.provide('ol.interaction.Touch');
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goog.require('goog.functions');
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goog.require('goog.object');
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goog.require('ol.MapBrowserEvent');
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goog.require('ol.MapBrowserEvent.EventType');
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goog.require('ol.Pixel');
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goog.require('ol.interaction.Interaction');
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/**
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* @constructor
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* @extends {ol.interaction.Interaction}
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*/
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ol.interaction.Touch = function() {
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goog.base(this);
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/**
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* @type {boolean}
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* @private
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*/
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this.handled_ = false;
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/**
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* @type {Object}
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* @private
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*/
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this.trackedTouches_ = {};
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/**
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* @type {Array.<Object>}
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* @protected
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*/
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this.targetTouches = [];
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};
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goog.inherits(ol.interaction.Touch, ol.interaction.Interaction);
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/**
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* @param {Array.<Object>} touches TouchEvents.
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* @return {ol.Pixel} Centroid pixel.
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*/
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ol.interaction.Touch.centroid = function(touches) {
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var length = touches.length;
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var clientX = 0;
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var clientY = 0;
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for (var i = 0; i < length; i++) {
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clientX += touches[i].clientX;
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clientY += touches[i].clientY;
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}
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return new ol.Pixel(clientX / length, clientY / length);
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};
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/**
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* @param {ol.MapBrowserEvent} mapBrowserEvent Event.
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* @private
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*/
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ol.interaction.Touch.prototype.updateTrackedTouches_ =
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function(mapBrowserEvent) {
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var event = mapBrowserEvent.browserEvent.getBrowserEvent();
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if (goog.isDef(event.targetTouches)) {
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// W3C touch events
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this.targetTouches = event.targetTouches;
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} else {
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// IE pointer event
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if (mapBrowserEvent.type == ol.MapBrowserEvent.EventType.TOUCHEND) {
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delete this.trackedTouches_[event.pointerId];
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} else {
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this.trackedTouches_[event.pointerId] = event;
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}
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this.targetTouches = goog.object.getValues(this.trackedTouches_);
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}
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};
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/**
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* @param {ol.MapBrowserEvent} mapBrowserEvent Event.
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* @protected
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*/
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ol.interaction.Touch.prototype.handleTouchMove = goog.nullFunction;
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/**
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* @param {ol.MapBrowserEvent} mapBrowserEvent Event.
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* @protected
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* @return {boolean} Capture dragging.
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*/
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ol.interaction.Touch.prototype.handleTouchEnd = goog.functions.FALSE;
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/**
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* @param {ol.MapBrowserEvent} mapBrowserEvent Event.
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* @protected
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* @return {boolean} Capture dragging.
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*/
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ol.interaction.Touch.prototype.handleTouchStart = goog.functions.FALSE;
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/**
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* @inheritDoc
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*/
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ol.interaction.Touch.prototype.handleMapBrowserEvent =
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function(mapBrowserEvent) {
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var browserEvent = mapBrowserEvent.browserEvent.getBrowserEvent();
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this.updateTrackedTouches_(mapBrowserEvent);
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if (this.handled_) {
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if (mapBrowserEvent.type == ol.MapBrowserEvent.EventType.TOUCHMOVE) {
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this.handleTouchMove(mapBrowserEvent);
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} else if (mapBrowserEvent.type == ol.MapBrowserEvent.EventType.TOUCHEND) {
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this.handled_ = this.handleTouchEnd(mapBrowserEvent);
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}
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}
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if (mapBrowserEvent.type == ol.MapBrowserEvent.EventType.TOUCHSTART) {
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this.handled_ = this.handleTouchStart(mapBrowserEvent);
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}
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};
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