# all files / ol/interaction/ doubleclickzoominteraction.js

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     goog.provide('ol.interaction.DoubleClickZoom');

    goog.require('goog.asserts');
    goog.require('ol.MapBrowserEvent');
    goog.require('ol.MapBrowserEvent.EventType');
    goog.require('ol.interaction.Interaction');

    /**
     * @classdesc
     * Allows the user to zoom by double-clicking on the map.
     *
     * @constructor
     * @extends {ol.interaction.Interaction}
     * @param {olx.interaction.DoubleClickZoomOptions=} opt_options Options.
     * @api stable
     */
    ol.interaction.DoubleClickZoom = function(opt_options) {

      var options = opt_options ? opt_options : {};

      /**
       * @private
       * @type {number}
       */
      this.delta_ = options.delta ? options.delta : 1;

      goog.base(this, {
        handleEvent: ol.interaction.DoubleClickZoom.handleEvent
      });

      /**
       * @private
       * @type {number}
       */
      this.duration_ = options.duration !== undefined ? options.duration : 250;

    };
    goog.inherits(ol.interaction.DoubleClickZoom, ol.interaction.Interaction);

    /**
     * Handles the {@link ol.MapBrowserEvent map browser event} (if it was a
     * doubleclick) and eventually zooms the map.
     * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
     * @return {boolean} `false` to stop event propagation.
     * @this {ol.interaction.DoubleClickZoom}
     * @api
     */
    ol.interaction.DoubleClickZoom.handleEvent = function(mapBrowserEvent) {
      var stopEvent = false;
      var browserEvent = mapBrowserEvent.originalEvent;
      Iif (mapBrowserEvent.type == ol.MapBrowserEvent.EventType.DBLCLICK) {
        var map = mapBrowserEvent.map;
        var anchor = mapBrowserEvent.coordinate;
        var delta = browserEvent.shiftKey ? -this.delta_ : this.delta_;
        var view = map.getView();
        goog.asserts.assert(view, 'map must have a view');
        ol.interaction.Interaction.zoomByDelta(
            map, view, delta, anchor, this.duration_);
        mapBrowserEvent.preventDefault();
        stopEvent = true;
      }
      return !stopEvent;
    };