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Diffstat (limited to 'srv/src/http/static/viz/2/goog/events/events.js')
| -rw-r--r-- | srv/src/http/static/viz/2/goog/events/events.js | 1003 |
1 files changed, 0 insertions, 1003 deletions
diff --git a/srv/src/http/static/viz/2/goog/events/events.js b/srv/src/http/static/viz/2/goog/events/events.js deleted file mode 100644 index 2787340..0000000 --- a/srv/src/http/static/viz/2/goog/events/events.js +++ /dev/null @@ -1,1003 +0,0 @@ -// 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_); - }); |