145 lines
3.5 KiB
JavaScript
145 lines
3.5 KiB
JavaScript
goog.provide('ol.interaction.MouseWheelZoom');
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goog.require('goog.asserts');
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goog.require('goog.events.MouseWheelEvent');
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goog.require('goog.events.MouseWheelHandler.EventType');
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goog.require('ol');
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goog.require('ol.Coordinate');
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goog.require('ol.interaction.Interaction');
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goog.require('ol.math');
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/**
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* @classdesc
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* Allows the user to zoom the map by scrolling the mouse wheel.
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*
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* @constructor
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* @extends {ol.interaction.Interaction}
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* @param {olx.interaction.MouseWheelZoomOptions=} opt_options Options.
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* @api stable
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*/
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ol.interaction.MouseWheelZoom = function(opt_options) {
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goog.base(this, {
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handleEvent: ol.interaction.MouseWheelZoom.handleEvent
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});
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var options = opt_options || {};
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/**
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* @private
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* @type {number}
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*/
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this.delta_ = 0;
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/**
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* @private
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* @type {number}
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*/
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this.duration_ = options.duration !== undefined ? options.duration : 250;
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/**
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* @private
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* @type {boolean}
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*/
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this.useAnchor_ = options.useAnchor !== undefined ? options.useAnchor : true;
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/**
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* @private
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* @type {?ol.Coordinate}
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*/
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this.lastAnchor_ = null;
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/**
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* @private
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* @type {number|undefined}
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*/
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this.startTime_ = undefined;
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/**
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* @private
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* @type {number|undefined}
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*/
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this.timeoutId_ = undefined;
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};
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goog.inherits(ol.interaction.MouseWheelZoom, ol.interaction.Interaction);
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/**
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* Handles the {@link ol.MapBrowserEvent map browser event} (if it was a
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* mousewheel-event) and eventually zooms the map.
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* @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
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* @return {boolean} `false` to stop event propagation.
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* @this {ol.interaction.MouseWheelZoom}
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* @api
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*/
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ol.interaction.MouseWheelZoom.handleEvent = function(mapBrowserEvent) {
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var stopEvent = false;
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if (mapBrowserEvent.type ==
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goog.events.MouseWheelHandler.EventType.MOUSEWHEEL) {
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var map = mapBrowserEvent.map;
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var mouseWheelEvent = mapBrowserEvent.browserEvent;
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goog.asserts.assertInstanceof(mouseWheelEvent, goog.events.MouseWheelEvent,
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'mouseWheelEvent should be of type MouseWheelEvent');
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if (this.useAnchor_) {
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this.lastAnchor_ = mapBrowserEvent.coordinate;
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}
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this.delta_ += mouseWheelEvent.deltaY;
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if (this.startTime_ === undefined) {
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this.startTime_ = Date.now();
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}
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var duration = ol.MOUSEWHEELZOOM_TIMEOUT_DURATION;
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var timeLeft = Math.max(duration - (Date.now() - this.startTime_), 0);
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goog.global.clearTimeout(this.timeoutId_);
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this.timeoutId_ = goog.global.setTimeout(
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goog.bind(this.doZoom_, this, map), timeLeft);
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mapBrowserEvent.preventDefault();
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stopEvent = true;
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}
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return !stopEvent;
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};
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/**
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* @private
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* @param {ol.Map} map Map.
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*/
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ol.interaction.MouseWheelZoom.prototype.doZoom_ = function(map) {
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var maxDelta = ol.MOUSEWHEELZOOM_MAXDELTA;
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var delta = ol.math.clamp(this.delta_, -maxDelta, maxDelta);
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var view = map.getView();
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goog.asserts.assert(view, 'map must have view');
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map.render();
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ol.interaction.Interaction.zoomByDelta(map, view, -delta, this.lastAnchor_,
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this.duration_);
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this.delta_ = 0;
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this.lastAnchor_ = null;
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this.startTime_ = undefined;
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this.timeoutId_ = undefined;
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};
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/**
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* Enable or disable using the mouse's location as an anchor when zooming
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* @param {boolean} useAnchor true to zoom to the mouse's location, false
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* to zoom to the center of the map
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* @api
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*/
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ol.interaction.MouseWheelZoom.prototype.setMouseAnchor = function(useAnchor) {
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this.useAnchor_ = useAnchor;
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if (!useAnchor) {
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this.lastAnchor_ = null;
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}
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};
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