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+// Copyright 2012 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview An interface for a listenable JavaScript object.
+ * @author chrishenry@google.com (Chris Henry)
+ */
+
+goog.provide('goog.events.Listenable');
+goog.provide('goog.events.ListenableKey');
+
+/** @suppress {extraRequire} */
+goog.require('goog.events.EventId');
+
+goog.forwardDeclare('goog.events.EventLike');
+goog.forwardDeclare('goog.events.EventTarget');
+
+
+
+/**
+ * A listenable interface. A listenable is an object with the ability
+ * to dispatch/broadcast events to "event listeners" registered via
+ * listen/listenOnce.
+ *
+ * The interface allows for an event propagation mechanism similar
+ * to one offered by native browser event targets, such as
+ * capture/bubble mechanism, stopping propagation, and preventing
+ * default actions. Capture/bubble mechanism depends on the ancestor
+ * tree constructed via {@code #getParentEventTarget}; this tree
+ * must be directed acyclic graph. The meaning of default action(s)
+ * in preventDefault is specific to a particular use case.
+ *
+ * Implementations that do not support capture/bubble or can not have
+ * a parent listenable can simply not implement any ability to set the
+ * parent listenable (and have {@code #getParentEventTarget} return
+ * null).
+ *
+ * Implementation of this class can be used with or independently from
+ * goog.events.
+ *
+ * Implementation must call {@code #addImplementation(implClass)}.
+ *
+ * @interface
+ * @see goog.events
+ * @see http://www.w3.org/TR/DOM-Level-2-Events/events.html
+ */
+goog.events.Listenable = function() {};
+
+
+/**
+ * An expando property to indicate that an object implements
+ * goog.events.Listenable.
+ *
+ * See addImplementation/isImplementedBy.
+ *
+ * @type {string}
+ * @const
+ */
+goog.events.Listenable.IMPLEMENTED_BY_PROP =
+    'closure_listenable_' + ((Math.random() * 1e6) | 0);
+
+
+/**
+ * Marks a given class (constructor) as an implementation of
+ * Listenable, do that we can query that fact at runtime. The class
+ * must have already implemented the interface.
+ * @param {!function(new:goog.events.Listenable,...)} cls The class constructor.
+ *     The corresponding class must have already implemented the interface.
+ */
+goog.events.Listenable.addImplementation = function(cls) {
+  cls.prototype[goog.events.Listenable.IMPLEMENTED_BY_PROP] = true;
+};
+
+
+/**
+ * @param {Object} obj The object to check.
+ * @return {boolean} Whether a given instance implements Listenable. The
+ *     class/superclass of the instance must call addImplementation.
+ */
+goog.events.Listenable.isImplementedBy = function(obj) {
+  return !!(obj && obj[goog.events.Listenable.IMPLEMENTED_BY_PROP]);
+};
+
+
+/**
+ * Adds an event listener. A listener can only be added once to an
+ * object and if it is added again the key for the listener is
+ * returned. Note that if the existing listener is a one-off listener
+ * (registered via listenOnce), it will no longer be a one-off
+ * listener after a call to listen().
+ *
+ * @param {string|!goog.events.EventId<EVENTOBJ>} type The event type id.
+ * @param {function(this:SCOPE, EVENTOBJ):(boolean|undefined)} listener Callback
+ *     method.
+ * @param {boolean=} opt_useCapture Whether to fire in capture phase
+ *     (defaults to false).
+ * @param {SCOPE=} opt_listenerScope Object in whose scope to call the
+ *     listener.
+ * @return {!goog.events.ListenableKey} Unique key for the listener.
+ * @template SCOPE,EVENTOBJ
+ */
+goog.events.Listenable.prototype.listen;
+
+
+/**
+ * Adds an event listener that is removed automatically after the
+ * listener fired once.
+ *
+ * If an existing listener already exists, listenOnce will do
+ * nothing. In particular, if the listener was previously registered
+ * via listen(), listenOnce() will not turn the listener into a
+ * one-off listener. Similarly, if there is already an existing
+ * one-off listener, listenOnce does not modify the listeners (it is
+ * still a once listener).
+ *
+ * @param {string|!goog.events.EventId<EVENTOBJ>} type The event type id.
+ * @param {function(this:SCOPE, EVENTOBJ):(boolean|undefined)} listener Callback
+ *     method.
+ * @param {boolean=} opt_useCapture Whether to fire in capture phase
+ *     (defaults to false).
+ * @param {SCOPE=} opt_listenerScope Object in whose scope to call the
+ *     listener.
+ * @return {!goog.events.ListenableKey} Unique key for the listener.
+ * @template SCOPE,EVENTOBJ
+ */
+goog.events.Listenable.prototype.listenOnce;
+
+
+/**
+ * Removes an event listener which was added with listen() or listenOnce().
+ *
+ * @param {string|!goog.events.EventId<EVENTOBJ>} type The event type id.
+ * @param {function(this:SCOPE, EVENTOBJ):(boolean|undefined)} listener Callback
+ *     method.
+ * @param {boolean=} opt_useCapture Whether to fire in capture phase
+ *     (defaults to false).
+ * @param {SCOPE=} opt_listenerScope Object in whose scope to call
+ *     the listener.
+ * @return {boolean} Whether any listener was removed.
+ * @template SCOPE,EVENTOBJ
+ */
+goog.events.Listenable.prototype.unlisten;
+
+
+/**
+ * Removes an event listener which was added with listen() by the key
+ * returned by listen().
+ *
+ * @param {!goog.events.ListenableKey} key The key returned by
+ *     listen() or listenOnce().
+ * @return {boolean} Whether any listener was removed.
+ */
+goog.events.Listenable.prototype.unlistenByKey;
+
+
+/**
+ * Dispatches an event (or event like object) and calls all listeners
+ * listening for events of this type. The type of the event is decided by the
+ * type property on the event object.
+ *
+ * If any of the listeners returns false OR calls preventDefault then this
+ * function will return false.  If one of the capture listeners calls
+ * stopPropagation, then the bubble listeners won't fire.
+ *
+ * @param {goog.events.EventLike} e Event object.
+ * @return {boolean} If anyone called preventDefault on the event object (or
+ *     if any of the listeners returns false) this will also return false.
+ */
+goog.events.Listenable.prototype.dispatchEvent;
+
+
+/**
+ * Removes all listeners from this listenable. If type is specified,
+ * it will only remove listeners of the particular type. otherwise all
+ * registered listeners will be removed.
+ *
+ * @param {string=} opt_type Type of event to remove, default is to
+ *     remove all types.
+ * @return {number} Number of listeners removed.
+ */
+goog.events.Listenable.prototype.removeAllListeners;
+
+
+/**
+ * Returns the parent of this event target to use for capture/bubble
+ * mechanism.
+ *
+ * NOTE(chrishenry): The name reflects the original implementation of
+ * custom event target ({@code goog.events.EventTarget}). We decided
+ * that changing the name is not worth it.
+ *
+ * @return {goog.events.Listenable} The parent EventTarget or null if
+ *     there is no parent.
+ */
+goog.events.Listenable.prototype.getParentEventTarget;
+
+
+/**
+ * Fires all registered listeners in this listenable for the given
+ * type and capture mode, passing them the given eventObject. This
+ * does not perform actual capture/bubble. Only implementors of the
+ * interface should be using this.
+ *
+ * @param {string|!goog.events.EventId<EVENTOBJ>} type The type of the
+ *     listeners to fire.
+ * @param {boolean} capture The capture mode of the listeners to fire.
+ * @param {EVENTOBJ} eventObject The event object to fire.
+ * @return {boolean} Whether all listeners succeeded without
+ *     attempting to prevent default behavior. If any listener returns
+ *     false or called goog.events.Event#preventDefault, this returns
+ *     false.
+ * @template EVENTOBJ
+ */
+goog.events.Listenable.prototype.fireListeners;
+
+
+/**
+ * Gets all listeners in this listenable for the given type and
+ * capture mode.
+ *
+ * @param {string|!goog.events.EventId} type The type of the listeners to fire.
+ * @param {boolean} capture The capture mode of the listeners to fire.
+ * @return {!Array<!goog.events.ListenableKey>} An array of registered
+ *     listeners.
+ * @template EVENTOBJ
+ */
+goog.events.Listenable.prototype.getListeners;
+
+
+/**
+ * Gets the goog.events.ListenableKey for the event or null if no such
+ * listener is in use.
+ *
+ * @param {string|!goog.events.EventId<EVENTOBJ>} type The name of the event
+ *     without the 'on' prefix.
+ * @param {function(this:SCOPE, EVENTOBJ):(boolean|undefined)} listener The
+ *     listener function to get.
+ * @param {boolean} capture Whether the listener is a capturing listener.
+ * @param {SCOPE=} opt_listenerScope Object in whose scope to call the
+ *     listener.
+ * @return {goog.events.ListenableKey} the found listener or null if not found.
+ * @template SCOPE,EVENTOBJ
+ */
+goog.events.Listenable.prototype.getListener;
+
+
+/**
+ * Whether there is any active listeners matching the specified
+ * signature. If either the type or capture parameters are
+ * unspecified, the function will match on the remaining criteria.
+ *
+ * @param {string|!goog.events.EventId<EVENTOBJ>=} opt_type Event type.
+ * @param {boolean=} opt_capture Whether to check for capture or bubble
+ *     listeners.
+ * @return {boolean} Whether there is any active listeners matching
+ *     the requested type and/or capture phase.
+ * @template EVENTOBJ
+ */
+goog.events.Listenable.prototype.hasListener;
+
+
+
+/**
+ * An interface that describes a single registered listener.
+ * @interface
+ */
+goog.events.ListenableKey = function() {};
+
+
+/**
+ * Counter used to create a unique key
+ * @type {number}
+ * @private
+ */
+goog.events.ListenableKey.counter_ = 0;
+
+
+/**
+ * Reserves a key to be used for ListenableKey#key field.
+ * @return {number} A number to be used to fill ListenableKey#key
+ *     field.
+ */
+goog.events.ListenableKey.reserveKey = function() {
+  return ++goog.events.ListenableKey.counter_;
+};
+
+
+/**
+ * The source event target.
+ * @type {Object|goog.events.Listenable|goog.events.EventTarget}
+ */
+goog.events.ListenableKey.prototype.src;
+
+
+/**
+ * The event type the listener is listening to.
+ * @type {string}
+ */
+goog.events.ListenableKey.prototype.type;
+
+
+/**
+ * The listener function.
+ * @type {function(?):?|{handleEvent:function(?):?}|null}
+ */
+goog.events.ListenableKey.prototype.listener;
+
+
+/**
+ * Whether the listener works on capture phase.
+ * @type {boolean}
+ */
+goog.events.ListenableKey.prototype.capture;
+
+
+/**
+ * The 'this' object for the listener function's scope.
+ * @type {Object|undefined}
+ */
+goog.events.ListenableKey.prototype.handler;
+
+
+/**
+ * A globally unique number to identify the key.
+ * @type {number}
+ */
+goog.events.ListenableKey.prototype.key;