120 lines
2.6 KiB
JavaScript
120 lines
2.6 KiB
JavaScript
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goog.provide('ol.control.Drag');
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goog.require('goog.asserts');
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goog.require('goog.events.EventType');
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goog.require('goog.functions');
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goog.require('ol.Control');
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goog.require('ol.Coordinate');
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goog.require('ol.MapBrowserEvent');
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/**
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* @constructor
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* @extends {ol.Control}
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*/
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ol.control.Drag = function() {
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goog.base(this);
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/**
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* @private
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* @type {boolean}
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*/
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this.dragging_ = false;
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/**
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* @type {number}
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*/
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this.startX = 0;
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/**
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* @type {number}
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*/
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this.startY = 0;
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/**
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* @type {number}
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*/
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this.offsetX = 0;
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/**
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* @type {number}
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*/
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this.offsetY = 0;
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/**
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* @type {ol.Coordinate}
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*/
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this.startCenter = null;
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/**
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* @type {ol.Coordinate}
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*/
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this.startCoordinate = null;
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};
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goog.inherits(ol.control.Drag, ol.Control);
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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.control.Drag.prototype.handleDrag = 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.control.Drag.prototype.handleDragStart = 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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*/
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ol.control.Drag.prototype.handleDragEnd = goog.nullFunction;
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/**
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* @inheritDoc
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*/
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ol.control.Drag.prototype.handleMapBrowserEvent = function(mapBrowserEvent) {
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var map = mapBrowserEvent.map;
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if (!map.isDef()) {
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return;
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}
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var browserEvent = mapBrowserEvent.browserEvent;
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if (this.dragging_) {
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if (mapBrowserEvent.type == goog.fx.Dragger.EventType.DRAG) {
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goog.asserts.assert(browserEvent instanceof goog.events.BrowserEvent);
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this.deltaX = browserEvent.clientX - this.startX;
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this.deltaY = browserEvent.clientY - this.startY;
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this.handleDrag(mapBrowserEvent);
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} else if (mapBrowserEvent.type == goog.fx.Dragger.EventType.END) {
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goog.asserts.assert(browserEvent instanceof goog.events.BrowserEvent);
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this.deltaX = browserEvent.clientX - this.startX;
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this.deltaY = browserEvent.clientY - this.startY;
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this.handleDragEnd(mapBrowserEvent);
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this.dragging_ = false;
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}
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} else if (mapBrowserEvent.type == goog.fx.Dragger.EventType.START) {
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goog.asserts.assert(browserEvent instanceof goog.events.BrowserEvent);
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this.startX = browserEvent.clientX;
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this.startY = browserEvent.clientY;
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this.deltaX = 0;
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this.deltaY = 0;
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this.startCenter = /** @type {!ol.Coordinate} */ map.getCenter();
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this.startCoordinate = /** @type {ol.Coordinate} */
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mapBrowserEvent.getCoordinate();
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if (this.handleDragStart(mapBrowserEvent)) {
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this.dragging_ = true;
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mapBrowserEvent.preventDefault();
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}
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}
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};
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