# all files / ol/ events.js

100% Statements 76/76
92.86% Branches 39/42
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100% Lines 76/76

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     goog.provide('ol.events');

    goog.require('ol.obj');

    /**
     * @param {ol.EventsKey} listenerObj Listener object.
     * @return {ol.EventsListenerFunctionType} Bound listener.
     */
    ol.events.bindListener_ = function(listenerObj) {
      var boundListener = function(evt) {
        var listener = listenerObj.listener;
        var bindTo = listenerObj.bindTo || listenerObj.target;
        if (listenerObj.callOnce) {
          ol.events.unlistenByKey(listenerObj);
        }
        return listener.call(bindTo, evt);
      };
      listenerObj.boundListener = boundListener;
      return boundListener;
    };

    /**
     * Finds the matching {@link ol.EventsKey} in the given listener
     * array.
     *
     * @param {!Array<!ol.EventsKey>} listeners Array of listeners.
     * @param {!Function} listener The listener function.
     * @param {Object=} opt_this The `this` value inside the listener.
     * @param {boolean=} opt_setDeleteIndex Set the deleteIndex on the matching
     *     listener, for {@link ol.events.unlistenByKey}.
     * @return {ol.EventsKey|undefined} The matching listener object.
     * @private
     */
    ol.events.findListener_ = function(listeners, listener, opt_this,
        opt_setDeleteIndex) {
      var listenerObj;
      for (var i = 0, ii = listeners.length; i < ii; ++i) {
        listenerObj = listeners[i];
        if (listenerObj.listener === listener &&
            listenerObj.bindTo === opt_this) {
          if (opt_setDeleteIndex) {
            listenerObj.deleteIndex = i;
          }
          return listenerObj;
        }
      }
      return undefined;
    };

    /**
     * @param {ol.EventTargetLike} target Target.
     * @param {string} type Type.
     * @return {Array.<ol.EventsKey>|undefined} Listeners.
     */
    ol.events.getListeners = function(target, type) {
      var listenerMap = target.ol_lm;
      return listenerMap ? listenerMap[type] : undefined;
    };

    /**
     * Get the lookup of listeners.  If one does not exist on the target, it is
     * created.
     * @param {ol.EventTargetLike} target Target.
     * @return {!Object.<string, Array.<ol.EventsKey>>} Map of
     *     listeners by event type.
     * @private
     */
    ol.events.getListenerMap_ = function(target) {
      var listenerMap = target.ol_lm;
      if (!listenerMap) {
        listenerMap = target.ol_lm = {};
      }
      return listenerMap;
    };

    /**
     * Clean up all listener objects of the given type.  All properties on the
     * listener objects will be removed, and if no listeners remain in the listener
     * map, it will be removed from the target.
     * @param {ol.EventTargetLike} target Target.
     * @param {string} type Type.
     * @private
     */
    ol.events.removeListeners_ = function(target, type) {
      var listeners = ol.events.getListeners(target, type);
      Eif (listeners) {
        for (var i = 0, ii = listeners.length; i < ii; ++i) {
          target.removeEventListener(type, listeners[i].boundListener);
          ol.obj.clear(listeners[i]);
        }
        listeners.length = 0;
        var listenerMap = target.ol_lm;
        Eif (listenerMap) {
          delete listenerMap[type];
          if (Object.keys(listenerMap).length === 0) {
            delete target.ol_lm;
          }
        }
      }
    };

    /**
     * Registers an event listener on an event target. Inspired by
     * {@link https://google.github.io/closure-library/api/source/closure/goog/events/events.js.src.html}
     *
     * This function efficiently binds a `listener` to a `this` object, and returns
     * a key for use with {@link ol.events.unlistenByKey}.
     *
     * @param {ol.EventTargetLike} target Event target.
     * @param {string} type Event type.
     * @param {ol.EventsListenerFunctionType} listener Listener.
     * @param {Object=} opt_this Object referenced by the `this` keyword in the
     *     listener. Default is the `target`.
     * @param {boolean=} opt_once If true, add the listener as one-off listener.
     * @return {ol.EventsKey} Unique key for the listener.
     */
    ol.events.listen = function(target, type, listener, opt_this, opt_once) {
      var listenerMap = ol.events.getListenerMap_(target);
      var listeners = listenerMap[type];
      if (!listeners) {
        listeners = listenerMap[type] = [];
      }
      var listenerObj = ol.events.findListener_(listeners, listener, opt_this,
          false);
      if (listenerObj) {
        if (!opt_once) {
          // Turn one-off listener into a permanent one.
          listenerObj.callOnce = false;
        }
      } else {
        listenerObj = /** @type {ol.EventsKey} */ ({
          bindTo: opt_this,
          callOnce: !!opt_once,
          listener: listener,
          target: target,
          type: type
        });
        target.addEventListener(type, ol.events.bindListener_(listenerObj));
        listeners.push(listenerObj);
      }

      return listenerObj;
    };

    /**
     * Registers a one-off event listener on an event target. Inspired by
     * {@link https://google.github.io/closure-library/api/source/closure/goog/events/events.js.src.html}
     *
     * This function efficiently binds a `listener` as self-unregistering listener
     * to a `this` object, and returns a key for use with
     * {@link ol.events.unlistenByKey} in case the listener needs to be unregistered
     * before it is called.
     *
     * When {@link ol.events.listen} is called with the same arguments after this
     * function, the self-unregistering listener will be turned into a permanent
     * listener.
     *
     * @param {ol.EventTargetLike} target Event target.
     * @param {string} type Event type.
     * @param {ol.EventsListenerFunctionType} listener Listener.
     * @param {Object=} opt_this Object referenced by the `this` keyword in the
     *     listener. Default is the `target`.
     * @return {ol.EventsKey} Key for unlistenByKey.
     */
    ol.events.listenOnce = function(target, type, listener, opt_this) {
      return ol.events.listen(target, type, listener, opt_this, true);
    };

    /**
     * Unregisters an event listener on an event target. Inspired by
     * {@link https://google.github.io/closure-library/api/source/closure/goog/events/events.js.src.html}
     *
     * To return a listener, this function needs to be called with the exact same
     * arguments that were used for a previous {@link ol.events.listen} call.
     *
     * @param {ol.EventTargetLike} target Event target.
     * @param {string} type Event type.
     * @param {ol.EventsListenerFunctionType} listener Listener.
     * @param {Object=} opt_this Object referenced by the `this` keyword in the
     *     listener. Default is the `target`.
     */
    ol.events.unlisten = function(target, type, listener, opt_this) {
      var listeners = ol.events.getListeners(target, type);
      if (listeners) {
        var listenerObj = ol.events.findListener_(listeners, listener, opt_this,
            true);
        if (listenerObj) {
          ol.events.unlistenByKey(listenerObj);
        }
      }
    };

    /**
     * Unregisters event listeners on an event target. Inspired by
     * {@link https://google.github.io/closure-library/api/source/closure/goog/events/events.js.src.html}
     *
     * The argument passed to this function is the key returned from
     * {@link ol.events.listen} or {@link ol.events.listenOnce}.
     *
     * @param {ol.EventsKey} key The key.
     */
    ol.events.unlistenByKey = function(key) {
      if (key && key.target) {
        key.target.removeEventListener(key.type, key.boundListener);
        var listeners = ol.events.getListeners(key.target, key.type);
        if (listeners) {
          var i = 'deleteIndex' in key ? key.deleteIndex : listeners.indexOf(key);
          Eif (i !== -1) {
            listeners.splice(i, 1);
          }
          if (listeners.length === 0) {
            ol.events.removeListeners_(key.target, key.type);
          }
        }
        ol.obj.clear(key);
      }
    };

    /**
     * Unregisters all event listeners on an event target. Inspired by
     * {@link https://google.github.io/closure-library/api/source/closure/goog/events/events.js.src.html}
     *
     * @param {ol.EventTargetLike} target Target.
     */
    ol.events.unlistenAll = function(target) {
      var listenerMap = ol.events.getListenerMap_(target);
      for (var type in listenerMap) {
        ol.events.removeListeners_(target, type);
      }
    };