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Diffstat (limited to 'src/http/static/viz/1/goog/events/events.js')
| -rw-r--r-- | src/http/static/viz/1/goog/events/events.js | 989 |
1 files changed, 989 insertions, 0 deletions
diff --git a/src/http/static/viz/1/goog/events/events.js b/src/http/static/viz/1/goog/events/events.js new file mode 100644 index 0000000..6a0acf7 --- /dev/null +++ b/src/http/static/viz/1/goog/events/events.js @@ -0,0 +1,989 @@ +// 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=} opt_capt Whether to fire in capture phase (defaults to + * false). + * @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_capt, opt_handler) { + if (goog.isArray(type)) { + for (var i = 0; i < type.length; i++) { + goog.events.listen(src, type[i], listener, opt_capt, opt_handler); + } + return null; + } + + listener = goog.events.wrapListener(listener); + if (goog.events.Listenable.isImplementedBy(src)) { + return src.listen( + /** @type {string|!goog.events.EventId} */ (type), listener, opt_capt, + opt_handler); + } else { + return goog.events.listen_( + /** @type {!EventTarget} */ (src), + /** @type {string|!goog.events.EventId} */ (type), listener, + /* callOnce */ false, opt_capt, 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} type Event type. + * @param {!Function} listener Callback function. + * @param {boolean} callOnce Whether the listener is a one-off + * listener or otherwise. + * @param {boolean=} opt_capt Whether to fire in capture phase (defaults to + * false). + * @param {Object=} opt_handler Element in whose scope to call the listener. + * @return {goog.events.ListenableKey} Unique key for the listener. + * @private + */ +goog.events.listen_ = function( + src, type, listener, callOnce, opt_capt, opt_handler) { + if (!type) { + throw Error('Invalid event type'); + } + + var capture = !!opt_capt; + 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 = + listenerMap.add(type, listener, callOnce, opt_capt, 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) { + src.addEventListener(type.toString(), proxy, capture); + } 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=} opt_capt Fire in capture phase?. + * @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_capt, opt_handler) { + if (goog.isArray(type)) { + for (var i = 0; i < type.length; i++) { + goog.events.listenOnce(src, type[i], listener, opt_capt, opt_handler); + } + return null; + } + + listener = goog.events.wrapListener(listener); + if (goog.events.Listenable.isImplementedBy(src)) { + return src.listenOnce( + /** @type {string|!goog.events.EventId} */ (type), listener, opt_capt, + opt_handler); + } else { + return goog.events.listen_( + /** @type {!EventTarget} */ (src), + /** @type {string|!goog.events.EventId} */ (type), listener, + /* callOnce */ true, opt_capt, 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=} 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 {?boolean} indicating whether the listener was there to remove. + * @template EVENTOBJ + */ +goog.events.unlisten = function(src, type, listener, opt_capt, opt_handler) { + if (goog.isArray(type)) { + for (var i = 0; i < type.length; i++) { + goog.events.unlisten(src, type[i], listener, opt_capt, opt_handler); + } + return null; + } + + listener = goog.events.wrapListener(listener); + if (goog.events.Listenable.isImplementedBy(src)) { + return src.unlisten( + /** @type {string|!goog.events.EventId} */ (type), listener, opt_capt, + 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 capture = !!opt_capt; + 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 { + 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 {boolean} 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 {boolean} 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 {boolean} */ + 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. + /** @preserveTry */ + 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_); + }); |