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+// Copyright 2005 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 event manager for both native browser event
+ * targets and custom JavaScript event targets
+ * ({@code goog.events.Listenable}). This provides an abstraction
+ * over browsers' event systems.
+ *
+ * It also provides a simulation of W3C event model's capture phase in
+ * Internet Explorer (IE 8 and below). Caveat: the simulation does not
+ * interact well with listeners registered directly on the elements
+ * (bypassing goog.events) or even with listeners registered via
+ * goog.events in a separate JS binary. In these cases, we provide
+ * no ordering guarantees.
+ *
+ * The listeners will receive a "patched" event object. Such event object
+ * contains normalized values for certain event properties that differs in
+ * different browsers.
+ *
+ * Example usage:
+ * <pre>
+ * goog.events.listen(myNode, 'click', function(e) { alert('woo') });
+ * goog.events.listen(myNode, 'mouseover', mouseHandler, true);
+ * goog.events.unlisten(myNode, 'mouseover', mouseHandler, true);
+ * goog.events.removeAll(myNode);
+ * </pre>
+ *
+ * in IE and event object patching]
+ * @author arv@google.com (Erik Arvidsson)
+ *
+ * @see ../demos/events.html
+ * @see ../demos/event-propagation.html
+ * @see ../demos/stopevent.html
+ */
+
+// IMPLEMENTATION NOTES:
+// goog.events stores an auxiliary data structure on each EventTarget
+// source being listened on. This allows us to take advantage of GC,
+// having the data structure GC'd when the EventTarget is GC'd. This
+// GC behavior is equivalent to using W3C DOM Events directly.
+
+goog.provide('goog.events');
+goog.provide('goog.events.CaptureSimulationMode');
+goog.provide('goog.events.Key');
+goog.provide('goog.events.ListenableType');
+
+goog.require('goog.asserts');
+goog.require('goog.debug.entryPointRegistry');
+goog.require('goog.events.BrowserEvent');
+goog.require('goog.events.BrowserFeature');
+goog.require('goog.events.Listenable');
+goog.require('goog.events.ListenerMap');
+
+goog.forwardDeclare('goog.debug.ErrorHandler');
+goog.forwardDeclare('goog.events.EventWrapper');
+
+
+/**
+ * @typedef {number|goog.events.ListenableKey}
+ */
+goog.events.Key;
+
+
+/**
+ * @typedef {EventTarget|goog.events.Listenable}
+ */
+goog.events.ListenableType;
+
+
+/**
+ * Property name on a native event target for the listener map
+ * associated with the event target.
+ * @private @const {string}
+ */
+goog.events.LISTENER_MAP_PROP_ = 'closure_lm_' + ((Math.random() * 1e6) | 0);
+
+
+/**
+ * String used to prepend to IE event types.
+ * @const
+ * @private
+ */
+goog.events.onString_ = 'on';
+
+
+/**
+ * Map of computed "on<eventname>" strings for IE event types. Caching
+ * this removes an extra object allocation in goog.events.listen which
+ * improves IE6 performance.
+ * @const
+ * @dict
+ * @private
+ */
+goog.events.onStringMap_ = {};
+
+
+/**
+ * @enum {number} Different capture simulation mode for IE8-.
+ */
+goog.events.CaptureSimulationMode = {
+ /**
+ * Does not perform capture simulation. Will asserts in IE8- when you
+ * add capture listeners.
+ */
+ OFF_AND_FAIL: 0,
+
+ /**
+ * Does not perform capture simulation, silently ignore capture
+ * listeners.
+ */
+ OFF_AND_SILENT: 1,
+
+ /**
+ * Performs capture simulation.
+ */
+ ON: 2
+};
+
+
+/**
+ * @define {number} The capture simulation mode for IE8-. By default,
+ * this is ON.
+ */
+goog.define('goog.events.CAPTURE_SIMULATION_MODE', 2);
+
+
+/**
+ * Estimated count of total native listeners.
+ * @private {number}
+ */
+goog.events.listenerCountEstimate_ = 0;
+
+
+/**
+ * Adds an event listener for a specific event on a native event
+ * target (such as a DOM element) or an object that has implemented
+ * {@link goog.events.Listenable}. 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 {EventTarget|goog.events.Listenable} src The node to listen
+ * to events on.
+ * @param {string|Array<string>|
+ * !goog.events.EventId<EVENTOBJ>|!Array<!goog.events.EventId<EVENTOBJ>>}
+ * type Event type or array of event types.
+ * @param {function(this:T, EVENTOBJ):?|{handleEvent:function(?):?}|null}
+ * listener Callback method, or an object with a handleEvent function.
+ * WARNING: passing an Object is now softly deprecated.
+ * @param {(boolean|!AddEventListenerOptions)=} opt_options
+ * @param {T=} opt_handler Element in whose scope to call the listener.
+ * @return {goog.events.Key} Unique key for the listener.
+ * @template T,EVENTOBJ
+ */
+goog.events.listen = function(src, type, listener, opt_options, opt_handler) {
+ if (opt_options && opt_options.once) {
+ return goog.events.listenOnce(
+ src, type, listener, opt_options, opt_handler);
+ }
+ if (goog.isArray(type)) {
+ for (var i = 0; i < type.length; i++) {
+ goog.events.listen(src, type[i], listener, opt_options, opt_handler);
+ }
+ return null;
+ }
+
+ listener = goog.events.wrapListener(listener);
+ if (goog.events.Listenable.isImplementedBy(src)) {
+ var capture =
+ goog.isObject(opt_options) ? !!opt_options.capture : !!opt_options;
+ return src.listen(
+ /** @type {string|!goog.events.EventId} */ (type), listener, capture,
+ opt_handler);
+ } else {
+ return goog.events.listen_(
+ /** @type {!EventTarget} */ (src), type, listener,
+ /* callOnce */ false, opt_options, opt_handler);
+ }
+};
+
+
+/**
+ * Adds an event listener for a specific event on a native event
+ * target. 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 a one-off listener will not change an existing listener,
+ * if any. On the other hand a normal listener will change existing
+ * one-off listener to become a normal listener.
+ *
+ * @param {EventTarget} src The node to listen to events on.
+ * @param {string|?goog.events.EventId<EVENTOBJ>} type Event type.
+ * @param {!Function} listener Callback function.
+ * @param {boolean} callOnce Whether the listener is a one-off
+ * listener or otherwise.
+ * @param {(boolean|!AddEventListenerOptions)=} opt_options
+ * @param {Object=} opt_handler Element in whose scope to call the listener.
+ * @return {goog.events.ListenableKey} Unique key for the listener.
+ * @template EVENTOBJ
+ * @private
+ */
+goog.events.listen_ = function(
+ src, type, listener, callOnce, opt_options, opt_handler) {
+ if (!type) {
+ throw Error('Invalid event type');
+ }
+
+ var capture =
+ goog.isObject(opt_options) ? !!opt_options.capture : !!opt_options;
+ if (capture && !goog.events.BrowserFeature.HAS_W3C_EVENT_SUPPORT) {
+ if (goog.events.CAPTURE_SIMULATION_MODE ==
+ goog.events.CaptureSimulationMode.OFF_AND_FAIL) {
+ goog.asserts.fail('Can not register capture listener in IE8-.');
+ return null;
+ } else if (
+ goog.events.CAPTURE_SIMULATION_MODE ==
+ goog.events.CaptureSimulationMode.OFF_AND_SILENT) {
+ return null;
+ }
+ }
+
+ var listenerMap = goog.events.getListenerMap_(src);
+ if (!listenerMap) {
+ src[goog.events.LISTENER_MAP_PROP_] = listenerMap =
+ new goog.events.ListenerMap(src);
+ }
+
+ var listenerObj = /** @type {goog.events.Listener} */ (
+ listenerMap.add(type, listener, callOnce, capture, opt_handler));
+
+ // If the listenerObj already has a proxy, it has been set up
+ // previously. We simply return.
+ if (listenerObj.proxy) {
+ return listenerObj;
+ }
+
+ var proxy = goog.events.getProxy();
+ listenerObj.proxy = proxy;
+
+ proxy.src = src;
+ proxy.listener = listenerObj;
+
+ // Attach the proxy through the browser's API
+ if (src.addEventListener) {
+ // Don't pass an object as `capture` if the browser doesn't support that.
+ if (!goog.events.BrowserFeature.PASSIVE_EVENTS) {
+ opt_options = capture;
+ }
+ // Don't break tests that expect a boolean.
+ if (opt_options === undefined) opt_options = false;
+ src.addEventListener(type.toString(), proxy, opt_options);
+ } else if (src.attachEvent) {
+ // The else if above used to be an unconditional else. It would call
+ // exception on IE11, spoiling the day of some callers. The previous
+ // incarnation of this code, from 2007, indicates that it replaced an
+ // earlier still version that caused excess allocations on IE6.
+ src.attachEvent(goog.events.getOnString_(type.toString()), proxy);
+ } else {
+ throw Error('addEventListener and attachEvent are unavailable.');
+ }
+
+ goog.events.listenerCountEstimate_++;
+ return listenerObj;
+};
+
+
+/**
+ * Helper function for returning a proxy function.
+ * @return {!Function} A new or reused function object.
+ */
+goog.events.getProxy = function() {
+ var proxyCallbackFunction = goog.events.handleBrowserEvent_;
+ // Use a local var f to prevent one allocation.
+ var f =
+ goog.events.BrowserFeature.HAS_W3C_EVENT_SUPPORT ? function(eventObject) {
+ return proxyCallbackFunction.call(f.src, f.listener, eventObject);
+ } : function(eventObject) {
+ var v = proxyCallbackFunction.call(f.src, f.listener, eventObject);
+ // NOTE(chrishenry): In IE, we hack in a capture phase. However, if
+ // there is inline event handler which tries to prevent default (for
+ // example <a href="..." onclick="return false">...</a>) in a
+ // descendant element, the prevent default will be overridden
+ // by this listener if this listener were to return true. Hence, we
+ // return undefined.
+ if (!v) return v;
+ };
+ return f;
+};
+
+
+/**
+ * Adds an event listener for a specific event on a native event
+ * target (such as a DOM element) or an object that has implemented
+ * {@link goog.events.Listenable}. After the event has fired the event
+ * listener is removed from the target.
+ *
+ * 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 {EventTarget|goog.events.Listenable} src The node to listen
+ * to events on.
+ * @param {string|Array<string>|
+ * !goog.events.EventId<EVENTOBJ>|!Array<!goog.events.EventId<EVENTOBJ>>}
+ * type Event type or array of event types.
+ * @param {function(this:T, EVENTOBJ):?|{handleEvent:function(?):?}|null}
+ * listener Callback method.
+ * @param {(boolean|!AddEventListenerOptions)=} opt_options
+ * @param {T=} opt_handler Element in whose scope to call the listener.
+ * @return {goog.events.Key} Unique key for the listener.
+ * @template T,EVENTOBJ
+ */
+goog.events.listenOnce = function(
+ src, type, listener, opt_options, opt_handler) {
+ if (goog.isArray(type)) {
+ for (var i = 0; i < type.length; i++) {
+ goog.events.listenOnce(src, type[i], listener, opt_options, opt_handler);
+ }
+ return null;
+ }
+
+ listener = goog.events.wrapListener(listener);
+ if (goog.events.Listenable.isImplementedBy(src)) {
+ var capture =
+ goog.isObject(opt_options) ? !!opt_options.capture : !!opt_options;
+ return src.listenOnce(
+ /** @type {string|!goog.events.EventId} */ (type), listener, capture,
+ opt_handler);
+ } else {
+ return goog.events.listen_(
+ /** @type {!EventTarget} */ (src), type, listener,
+ /* callOnce */ true, opt_options, opt_handler);
+ }
+};
+
+
+/**
+ * Adds an event listener with a specific event wrapper on a DOM Node or an
+ * object that has implemented {@link goog.events.Listenable}. A listener can
+ * only be added once to an object.
+ *
+ * @param {EventTarget|goog.events.Listenable} src The target to
+ * listen to events on.
+ * @param {goog.events.EventWrapper} wrapper Event wrapper to use.
+ * @param {function(this:T, ?):?|{handleEvent:function(?):?}|null} listener
+ * Callback method, or an object with a handleEvent function.
+ * @param {boolean=} opt_capt Whether to fire in capture phase (defaults to
+ * false).
+ * @param {T=} opt_handler Element in whose scope to call the listener.
+ * @template T
+ */
+goog.events.listenWithWrapper = function(
+ src, wrapper, listener, opt_capt, opt_handler) {
+ wrapper.listen(src, listener, opt_capt, opt_handler);
+};
+
+
+/**
+ * Removes an event listener which was added with listen().
+ *
+ * @param {EventTarget|goog.events.Listenable} src The target to stop
+ * listening to events on.
+ * @param {string|Array<string>|
+ * !goog.events.EventId<EVENTOBJ>|!Array<!goog.events.EventId<EVENTOBJ>>}
+ * type Event type or array of event types to unlisten to.
+ * @param {function(?):?|{handleEvent:function(?):?}|null} listener The
+ * listener function to remove.
+ * @param {(boolean|!EventListenerOptions)=} opt_options
+ * whether the listener is fired during the capture or bubble phase of the
+ * event.
+ * @param {Object=} opt_handler Element in whose scope to call the listener.
+ * @return {?boolean} indicating whether the listener was there to remove.
+ * @template EVENTOBJ
+ */
+goog.events.unlisten = function(src, type, listener, opt_options, opt_handler) {
+ if (goog.isArray(type)) {
+ for (var i = 0; i < type.length; i++) {
+ goog.events.unlisten(src, type[i], listener, opt_options, opt_handler);
+ }
+ return null;
+ }
+ var capture =
+ goog.isObject(opt_options) ? !!opt_options.capture : !!opt_options;
+
+ listener = goog.events.wrapListener(listener);
+ if (goog.events.Listenable.isImplementedBy(src)) {
+ return src.unlisten(
+ /** @type {string|!goog.events.EventId} */ (type), listener, capture,
+ opt_handler);
+ }
+
+ if (!src) {
+ // TODO(chrishenry): We should tighten the API to only accept
+ // non-null objects, or add an assertion here.
+ return false;
+ }
+
+ var listenerMap = goog.events.getListenerMap_(
+ /** @type {!EventTarget} */ (src));
+ if (listenerMap) {
+ var listenerObj = listenerMap.getListener(
+ /** @type {string|!goog.events.EventId} */ (type), listener, capture,
+ opt_handler);
+ if (listenerObj) {
+ return goog.events.unlistenByKey(listenerObj);
+ }
+ }
+
+ return false;
+};
+
+
+/**
+ * Removes an event listener which was added with listen() by the key
+ * returned by listen().
+ *
+ * @param {goog.events.Key} key The key returned by listen() for this
+ * event listener.
+ * @return {boolean} indicating whether the listener was there to remove.
+ */
+goog.events.unlistenByKey = function(key) {
+ // TODO(chrishenry): Remove this check when tests that rely on this
+ // are fixed.
+ if (goog.isNumber(key)) {
+ return false;
+ }
+
+ var listener = key;
+ if (!listener || listener.removed) {
+ return false;
+ }
+
+ var src = listener.src;
+ if (goog.events.Listenable.isImplementedBy(src)) {
+ return /** @type {!goog.events.Listenable} */ (src).unlistenByKey(listener);
+ }
+
+ var type = listener.type;
+ var proxy = listener.proxy;
+ if (src.removeEventListener) {
+ src.removeEventListener(type, proxy, listener.capture);
+ } else if (src.detachEvent) {
+ src.detachEvent(goog.events.getOnString_(type), proxy);
+ }
+ goog.events.listenerCountEstimate_--;
+
+ var listenerMap = goog.events.getListenerMap_(
+ /** @type {!EventTarget} */ (src));
+ // TODO(chrishenry): Try to remove this conditional and execute the
+ // first branch always. This should be safe.
+ if (listenerMap) {
+ listenerMap.removeByKey(listener);
+ if (listenerMap.getTypeCount() == 0) {
+ // Null the src, just because this is simple to do (and useful
+ // for IE <= 7).
+ listenerMap.src = null;
+ // We don't use delete here because IE does not allow delete
+ // on a window object.
+ src[goog.events.LISTENER_MAP_PROP_] = null;
+ }
+ } else {
+ /** @type {!goog.events.Listener} */ (listener).markAsRemoved();
+ }
+
+ return true;
+};
+
+
+/**
+ * Removes an event listener which was added with listenWithWrapper().
+ *
+ * @param {EventTarget|goog.events.Listenable} src The target to stop
+ * listening to events on.
+ * @param {goog.events.EventWrapper} wrapper Event wrapper to use.
+ * @param {function(?):?|{handleEvent:function(?):?}|null} listener The
+ * listener function to remove.
+ * @param {boolean=} opt_capt In DOM-compliant browsers, this determines
+ * whether the listener is fired during the capture or bubble phase of the
+ * event.
+ * @param {Object=} opt_handler Element in whose scope to call the listener.
+ */
+goog.events.unlistenWithWrapper = function(
+ src, wrapper, listener, opt_capt, opt_handler) {
+ wrapper.unlisten(src, listener, opt_capt, opt_handler);
+};
+
+
+/**
+ * Removes all listeners from an object. You can also optionally
+ * remove listeners of a particular type.
+ *
+ * @param {Object|undefined} obj Object to remove listeners from. Must be an
+ * EventTarget or a goog.events.Listenable.
+ * @param {string|!goog.events.EventId=} opt_type Type of event to remove.
+ * Default is all types.
+ * @return {number} Number of listeners removed.
+ */
+goog.events.removeAll = function(obj, opt_type) {
+ // TODO(chrishenry): Change the type of obj to
+ // (!EventTarget|!goog.events.Listenable).
+
+ if (!obj) {
+ return 0;
+ }
+
+ if (goog.events.Listenable.isImplementedBy(obj)) {
+ return /** @type {?} */ (obj).removeAllListeners(opt_type);
+ }
+
+ var listenerMap = goog.events.getListenerMap_(
+ /** @type {!EventTarget} */ (obj));
+ if (!listenerMap) {
+ return 0;
+ }
+
+ var count = 0;
+ var typeStr = opt_type && opt_type.toString();
+ for (var type in listenerMap.listeners) {
+ if (!typeStr || type == typeStr) {
+ // Clone so that we don't need to worry about unlistenByKey
+ // changing the content of the ListenerMap.
+ var listeners = listenerMap.listeners[type].concat();
+ for (var i = 0; i < listeners.length; ++i) {
+ if (goog.events.unlistenByKey(listeners[i])) {
+ ++count;
+ }
+ }
+ }
+ }
+ return count;
+};
+
+
+/**
+ * Gets the listeners for a given object, type and capture phase.
+ *
+ * @param {Object} obj Object to get listeners for.
+ * @param {string|!goog.events.EventId} type Event type.
+ * @param {boolean} capture Capture phase?.
+ * @return {Array<!goog.events.Listener>} Array of listener objects.
+ */
+goog.events.getListeners = function(obj, type, capture) {
+ if (goog.events.Listenable.isImplementedBy(obj)) {
+ return /** @type {!goog.events.Listenable} */ (obj).getListeners(
+ type, capture);
+ } else {
+ if (!obj) {
+ // TODO(chrishenry): We should tighten the API to accept
+ // !EventTarget|goog.events.Listenable, and add an assertion here.
+ return [];
+ }
+
+ var listenerMap = goog.events.getListenerMap_(
+ /** @type {!EventTarget} */ (obj));
+ return listenerMap ? listenerMap.getListeners(type, capture) : [];
+ }
+};
+
+
+/**
+ * Gets the goog.events.Listener for the event or null if no such listener is
+ * in use.
+ *
+ * @param {EventTarget|goog.events.Listenable} src The target from
+ * which to get listeners.
+ * @param {?string|!goog.events.EventId<EVENTOBJ>} type The type of the event.
+ * @param {function(EVENTOBJ):?|{handleEvent:function(?):?}|null} listener The
+ * listener function to get.
+ * @param {boolean=} opt_capt In DOM-compliant browsers, this determines
+ * whether the listener is fired during the
+ * capture or bubble phase of the event.
+ * @param {Object=} opt_handler Element in whose scope to call the listener.
+ * @return {goog.events.ListenableKey} the found listener or null if not found.
+ * @template EVENTOBJ
+ */
+goog.events.getListener = function(src, type, listener, opt_capt, opt_handler) {
+ // TODO(chrishenry): Change type from ?string to string, or add assertion.
+ type = /** @type {string} */ (type);
+ listener = goog.events.wrapListener(listener);
+ var capture = !!opt_capt;
+ if (goog.events.Listenable.isImplementedBy(src)) {
+ return src.getListener(type, listener, capture, opt_handler);
+ }
+
+ if (!src) {
+ // TODO(chrishenry): We should tighten the API to only accept
+ // non-null objects, or add an assertion here.
+ return null;
+ }
+
+ var listenerMap = goog.events.getListenerMap_(
+ /** @type {!EventTarget} */ (src));
+ if (listenerMap) {
+ return listenerMap.getListener(type, listener, capture, opt_handler);
+ }
+ return null;
+};
+
+
+/**
+ * Returns whether an event target has 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 {EventTarget|goog.events.Listenable} obj Target to get
+ * listeners for.
+ * @param {string|!goog.events.EventId=} opt_type Event type.
+ * @param {boolean=} opt_capture Whether to check for capture or bubble-phase
+ * listeners.
+ * @return {boolean} Whether an event target has one or more listeners matching
+ * the requested type and/or capture phase.
+ */
+goog.events.hasListener = function(obj, opt_type, opt_capture) {
+ if (goog.events.Listenable.isImplementedBy(obj)) {
+ return obj.hasListener(opt_type, opt_capture);
+ }
+
+ var listenerMap = goog.events.getListenerMap_(
+ /** @type {!EventTarget} */ (obj));
+ return !!listenerMap && listenerMap.hasListener(opt_type, opt_capture);
+};
+
+
+/**
+ * Provides a nice string showing the normalized event objects public members
+ * @param {Object} e Event Object.
+ * @return {string} String of the public members of the normalized event object.
+ */
+goog.events.expose = function(e) {
+ var str = [];
+ for (var key in e) {
+ if (e[key] && e[key].id) {
+ str.push(key + ' = ' + e[key] + ' (' + e[key].id + ')');
+ } else {
+ str.push(key + ' = ' + e[key]);
+ }
+ }
+ return str.join('\n');
+};
+
+
+/**
+ * Returns a string with on prepended to the specified type. This is used for IE
+ * which expects "on" to be prepended. This function caches the string in order
+ * to avoid extra allocations in steady state.
+ * @param {string} type Event type.
+ * @return {string} The type string with 'on' prepended.
+ * @private
+ */
+goog.events.getOnString_ = function(type) {
+ if (type in goog.events.onStringMap_) {
+ return goog.events.onStringMap_[type];
+ }
+ return goog.events.onStringMap_[type] = goog.events.onString_ + type;
+};
+
+
+/**
+ * Fires an object's listeners of a particular type and phase
+ *
+ * @param {Object} obj Object whose listeners to call.
+ * @param {string|!goog.events.EventId} type Event type.
+ * @param {boolean} capture Which event phase.
+ * @param {Object} eventObject Event object to be passed to listener.
+ * @return {boolean} True if all listeners returned true else false.
+ */
+goog.events.fireListeners = function(obj, type, capture, eventObject) {
+ if (goog.events.Listenable.isImplementedBy(obj)) {
+ return /** @type {!goog.events.Listenable} */ (obj).fireListeners(
+ type, capture, eventObject);
+ }
+
+ return goog.events.fireListeners_(obj, type, capture, eventObject);
+};
+
+
+/**
+ * Fires an object's listeners of a particular type and phase.
+ * @param {Object} obj Object whose listeners to call.
+ * @param {string|!goog.events.EventId} type Event type.
+ * @param {boolean} capture Which event phase.
+ * @param {Object} eventObject Event object to be passed to listener.
+ * @return {boolean} True if all listeners returned true else false.
+ * @private
+ */
+goog.events.fireListeners_ = function(obj, type, capture, eventObject) {
+ /** @type {boolean} */
+ var retval = true;
+
+ var listenerMap = goog.events.getListenerMap_(
+ /** @type {EventTarget} */ (obj));
+ if (listenerMap) {
+ // TODO(chrishenry): Original code avoids array creation when there
+ // is no listener, so we do the same. If this optimization turns
+ // out to be not required, we can replace this with
+ // listenerMap.getListeners(type, capture) instead, which is simpler.
+ var listenerArray = listenerMap.listeners[type.toString()];
+ if (listenerArray) {
+ listenerArray = listenerArray.concat();
+ for (var i = 0; i < listenerArray.length; i++) {
+ var listener = listenerArray[i];
+ // We might not have a listener if the listener was removed.
+ if (listener && listener.capture == capture && !listener.removed) {
+ var result = goog.events.fireListener(listener, eventObject);
+ retval = retval && (result !== false);
+ }
+ }
+ }
+ }
+ return retval;
+};
+
+
+/**
+ * Fires a listener with a set of arguments
+ *
+ * @param {goog.events.Listener} listener The listener object to call.
+ * @param {Object} eventObject The event object to pass to the listener.
+ * @return {*} Result of listener.
+ */
+goog.events.fireListener = function(listener, eventObject) {
+ var listenerFn = listener.listener;
+ var listenerHandler = listener.handler || listener.src;
+
+ if (listener.callOnce) {
+ goog.events.unlistenByKey(listener);
+ }
+ return listenerFn.call(listenerHandler, eventObject);
+};
+
+
+/**
+ * Gets the total number of listeners currently in the system.
+ * @return {number} Number of listeners.
+ * @deprecated This returns estimated count, now that Closure no longer
+ * stores a central listener registry. We still return an estimation
+ * to keep existing listener-related tests passing. In the near future,
+ * this function will be removed.
+ */
+goog.events.getTotalListenerCount = function() {
+ return goog.events.listenerCountEstimate_;
+};
+
+
+/**
+ * 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.Listenable} src The event target.
+ * @param {goog.events.EventLike} e Event object.
+ * @return {boolean} If anyone called preventDefault on the event object (or
+ * if any of the handlers returns false) this will also return false.
+ * If there are no handlers, or if all handlers return true, this returns
+ * true.
+ */
+goog.events.dispatchEvent = function(src, e) {
+ goog.asserts.assert(
+ goog.events.Listenable.isImplementedBy(src),
+ 'Can not use goog.events.dispatchEvent with ' +
+ 'non-goog.events.Listenable instance.');
+ return src.dispatchEvent(e);
+};
+
+
+/**
+ * Installs exception protection for the browser event entry point using the
+ * given error handler.
+ *
+ * @param {goog.debug.ErrorHandler} errorHandler Error handler with which to
+ * protect the entry point.
+ */
+goog.events.protectBrowserEventEntryPoint = function(errorHandler) {
+ goog.events.handleBrowserEvent_ =
+ errorHandler.protectEntryPoint(goog.events.handleBrowserEvent_);
+};
+
+
+/**
+ * Handles an event and dispatches it to the correct listeners. This
+ * function is a proxy for the real listener the user specified.
+ *
+ * @param {goog.events.Listener} listener The listener object.
+ * @param {Event=} opt_evt Optional event object that gets passed in via the
+ * native event handlers.
+ * @return {*} Result of the event handler.
+ * @this {EventTarget} The object or Element that fired the event.
+ * @private
+ */
+goog.events.handleBrowserEvent_ = function(listener, opt_evt) {
+ if (listener.removed) {
+ return true;
+ }
+
+ // Synthesize event propagation if the browser does not support W3C
+ // event model.
+ if (!goog.events.BrowserFeature.HAS_W3C_EVENT_SUPPORT) {
+ var ieEvent = opt_evt ||
+ /** @type {Event} */ (goog.getObjectByName('window.event'));
+ var evt = new goog.events.BrowserEvent(ieEvent, this);
+ /** @type {*} */
+ var retval = true;
+
+ if (goog.events.CAPTURE_SIMULATION_MODE ==
+ goog.events.CaptureSimulationMode.ON) {
+ // If we have not marked this event yet, we should perform capture
+ // simulation.
+ if (!goog.events.isMarkedIeEvent_(ieEvent)) {
+ goog.events.markIeEvent_(ieEvent);
+
+ var ancestors = [];
+ for (var parent = evt.currentTarget; parent;
+ parent = parent.parentNode) {
+ ancestors.push(parent);
+ }
+
+ // Fire capture listeners.
+ var type = listener.type;
+ for (var i = ancestors.length - 1; !evt.propagationStopped_ && i >= 0;
+ i--) {
+ evt.currentTarget = ancestors[i];
+ var result =
+ goog.events.fireListeners_(ancestors[i], type, true, evt);
+ retval = retval && result;
+ }
+
+ // Fire bubble listeners.
+ //
+ // We can technically rely on IE to perform bubble event
+ // propagation. However, it turns out that IE fires events in
+ // opposite order of attachEvent registration, which broke
+ // some code and tests that rely on the order. (While W3C DOM
+ // Level 2 Events TR leaves the event ordering unspecified,
+ // modern browsers and W3C DOM Level 3 Events Working Draft
+ // actually specify the order as the registration order.)
+ for (var i = 0; !evt.propagationStopped_ && i < ancestors.length; i++) {
+ evt.currentTarget = ancestors[i];
+ var result =
+ goog.events.fireListeners_(ancestors[i], type, false, evt);
+ retval = retval && result;
+ }
+ }
+ } else {
+ retval = goog.events.fireListener(listener, evt);
+ }
+ return retval;
+ }
+
+ // Otherwise, simply fire the listener.
+ return goog.events.fireListener(
+ listener, new goog.events.BrowserEvent(opt_evt, this));
+};
+
+
+/**
+ * This is used to mark the IE event object so we do not do the Closure pass
+ * twice for a bubbling event.
+ * @param {Event} e The IE browser event.
+ * @private
+ */
+goog.events.markIeEvent_ = function(e) {
+ // Only the keyCode and the returnValue can be changed. We use keyCode for
+ // non keyboard events.
+ // event.returnValue is a bit more tricky. It is undefined by default. A
+ // boolean false prevents the default action. In a window.onbeforeunload and
+ // the returnValue is non undefined it will be alerted. However, we will only
+ // modify the returnValue for keyboard events. We can get a problem if non
+ // closure events sets the keyCode or the returnValue
+
+ var useReturnValue = false;
+
+ if (e.keyCode == 0) {
+ // We cannot change the keyCode in case that srcElement is input[type=file].
+ // We could test that that is the case but that would allocate 3 objects.
+ // If we use try/catch we will only allocate extra objects in the case of a
+ // failure.
+
+ try {
+ e.keyCode = -1;
+ return;
+ } catch (ex) {
+ useReturnValue = true;
+ }
+ }
+
+ if (useReturnValue ||
+ /** @type {boolean|undefined} */ (e.returnValue) == undefined) {
+ e.returnValue = true;
+ }
+};
+
+
+/**
+ * This is used to check if an IE event has already been handled by the Closure
+ * system so we do not do the Closure pass twice for a bubbling event.
+ * @param {Event} e The IE browser event.
+ * @return {boolean} True if the event object has been marked.
+ * @private
+ */
+goog.events.isMarkedIeEvent_ = function(e) {
+ return e.keyCode < 0 || e.returnValue != undefined;
+};
+
+
+/**
+ * Counter to create unique event ids.
+ * @private {number}
+ */
+goog.events.uniqueIdCounter_ = 0;
+
+
+/**
+ * Creates a unique event id.
+ *
+ * @param {string} identifier The identifier.
+ * @return {string} A unique identifier.
+ * @idGenerator {unique}
+ */
+goog.events.getUniqueId = function(identifier) {
+ return identifier + '_' + goog.events.uniqueIdCounter_++;
+};
+
+
+/**
+ * @param {EventTarget} src The source object.
+ * @return {goog.events.ListenerMap} A listener map for the given
+ * source object, or null if none exists.
+ * @private
+ */
+goog.events.getListenerMap_ = function(src) {
+ var listenerMap = src[goog.events.LISTENER_MAP_PROP_];
+ // IE serializes the property as well (e.g. when serializing outer
+ // HTML). So we must check that the value is of the correct type.
+ return listenerMap instanceof goog.events.ListenerMap ? listenerMap : null;
+};
+
+
+/**
+ * Expando property for listener function wrapper for Object with
+ * handleEvent.
+ * @private @const {string}
+ */
+goog.events.LISTENER_WRAPPER_PROP_ =
+ '__closure_events_fn_' + ((Math.random() * 1e9) >>> 0);
+
+
+/**
+ * @param {Object|Function} listener The listener function or an
+ * object that contains handleEvent method.
+ * @return {!Function} Either the original function or a function that
+ * calls obj.handleEvent. If the same listener is passed to this
+ * function more than once, the same function is guaranteed to be
+ * returned.
+ */
+goog.events.wrapListener = function(listener) {
+ goog.asserts.assert(listener, 'Listener can not be null.');
+
+ if (goog.isFunction(listener)) {
+ return listener;
+ }
+
+ goog.asserts.assert(
+ listener.handleEvent, 'An object listener must have handleEvent method.');
+ if (!listener[goog.events.LISTENER_WRAPPER_PROP_]) {
+ listener[goog.events.LISTENER_WRAPPER_PROP_] = function(e) {
+ return /** @type {?} */ (listener).handleEvent(e);
+ };
+ }
+ return listener[goog.events.LISTENER_WRAPPER_PROP_];
+};
+
+
+// Register the browser event handler as an entry point, so that
+// it can be monitored for exception handling, etc.
+goog.debug.entryPointRegistry.register(
+ /**
+ * @param {function(!Function): !Function} transformer The transforming
+ * function.
+ */
+ function(transformer) {
+ goog.events.handleBrowserEvent_ =
+ transformer(goog.events.handleBrowserEvent_);
+ });