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- goog.provide('goog.events.EventTarget');
- goog.require('goog.Disposable');
- goog.require('goog.asserts');
- goog.require('goog.events');
- goog.require('goog.events.Event');
- goog.require('goog.events.Listenable');
- goog.require('goog.events.ListenerMap');
- goog.require('goog.object');
- goog.events.EventTarget = function() {
- goog.Disposable.call(this);
-
- this.eventTargetListeners_ = new goog.events.ListenerMap(this);
-
- this.actualEventTarget_ = this;
-
- this.parentEventTarget_ = null;
- };
- goog.inherits(goog.events.EventTarget, goog.Disposable);
- goog.events.Listenable.addImplementation(goog.events.EventTarget);
- goog.events.EventTarget.MAX_ANCESTORS_ = 1000;
- goog.events.EventTarget.prototype.getParentEventTarget = function() {
- return this.parentEventTarget_;
- };
- goog.events.EventTarget.prototype.setParentEventTarget = function(parent) {
- this.parentEventTarget_ = parent;
- };
- goog.events.EventTarget.prototype.addEventListener = function(
- type, handler, opt_capture, opt_handlerScope) {
- goog.events.listen(this, type, handler, opt_capture, opt_handlerScope);
- };
- goog.events.EventTarget.prototype.removeEventListener = function(
- type, handler, opt_capture, opt_handlerScope) {
- goog.events.unlisten(this, type, handler, opt_capture, opt_handlerScope);
- };
- goog.events.EventTarget.prototype.dispatchEvent = function(e) {
- this.assertInitialized_();
- var ancestorsTree, ancestor = this.getParentEventTarget();
- if (ancestor) {
- ancestorsTree = [];
- var ancestorCount = 1;
- for (; ancestor; ancestor = ancestor.getParentEventTarget()) {
- ancestorsTree.push(ancestor);
- goog.asserts.assert(
- (++ancestorCount < goog.events.EventTarget.MAX_ANCESTORS_),
- 'infinite loop');
- }
- }
- return goog.events.EventTarget.dispatchEventInternal_(
- this.actualEventTarget_, e, ancestorsTree);
- };
- goog.events.EventTarget.prototype.disposeInternal = function() {
- goog.events.EventTarget.superClass_.disposeInternal.call(this);
- this.removeAllListeners();
- this.parentEventTarget_ = null;
- };
- goog.events.EventTarget.prototype.listen = function(
- type, listener, opt_useCapture, opt_listenerScope) {
- this.assertInitialized_();
- return this.eventTargetListeners_.add(
- String(type), listener, false , opt_useCapture,
- opt_listenerScope);
- };
- goog.events.EventTarget.prototype.listenOnce = function(
- type, listener, opt_useCapture, opt_listenerScope) {
- return this.eventTargetListeners_.add(
- String(type), listener, true , opt_useCapture,
- opt_listenerScope);
- };
- goog.events.EventTarget.prototype.unlisten = function(
- type, listener, opt_useCapture, opt_listenerScope) {
- return this.eventTargetListeners_.remove(
- String(type), listener, opt_useCapture, opt_listenerScope);
- };
- goog.events.EventTarget.prototype.unlistenByKey = function(key) {
- return this.eventTargetListeners_.removeByKey(key);
- };
- goog.events.EventTarget.prototype.removeAllListeners = function(opt_type) {
-
-
-
- if (!this.eventTargetListeners_) {
- return 0;
- }
- return this.eventTargetListeners_.removeAll(opt_type);
- };
- goog.events.EventTarget.prototype.fireListeners = function(
- type, capture, eventObject) {
-
-
-
-
- var listenerArray = this.eventTargetListeners_.listeners[String(type)];
- if (!listenerArray) {
- return true;
- }
- listenerArray = listenerArray.concat();
- var rv = true;
- for (var i = 0; i < listenerArray.length; ++i) {
- var listener = listenerArray[i];
-
- if (listener && !listener.removed && listener.capture == capture) {
- var listenerFn = listener.listener;
- var listenerHandler = listener.handler || listener.src;
- if (listener.callOnce) {
- this.unlistenByKey(listener);
- }
- rv = listenerFn.call(listenerHandler, eventObject) !== false && rv;
- }
- }
- return rv && eventObject.returnValue_ != false;
- };
- goog.events.EventTarget.prototype.getListeners = function(type, capture) {
- return this.eventTargetListeners_.getListeners(String(type), capture);
- };
- goog.events.EventTarget.prototype.getListener = function(
- type, listener, capture, opt_listenerScope) {
- return this.eventTargetListeners_.getListener(
- String(type), listener, capture, opt_listenerScope);
- };
- goog.events.EventTarget.prototype.hasListener = function(
- opt_type, opt_capture) {
- var id = goog.isDef(opt_type) ? String(opt_type) : undefined;
- return this.eventTargetListeners_.hasListener(id, opt_capture);
- };
- goog.events.EventTarget.prototype.setTargetForTesting = function(target) {
- this.actualEventTarget_ = target;
- };
- goog.events.EventTarget.prototype.assertInitialized_ = function() {
- goog.asserts.assert(
- this.eventTargetListeners_,
- 'Event target is not initialized. Did you call the superclass ' +
- '(goog.events.EventTarget) constructor?');
- };
- goog.events.EventTarget.dispatchEventInternal_ = function(
- target, e, opt_ancestorsTree) {
- var type = e.type || (e);
-
-
- if (goog.isString(e)) {
- e = new goog.events.Event(e, target);
- } else if (!(e instanceof goog.events.Event)) {
- var oldEvent = e;
- e = new goog.events.Event(type, target);
- goog.object.extend(e, oldEvent);
- } else {
- e.target = e.target || target;
- }
- var rv = true, currentTarget;
-
- if (opt_ancestorsTree) {
- for (var i = opt_ancestorsTree.length - 1; !e.propagationStopped_ && i >= 0;
- i--) {
- currentTarget = e.currentTarget = opt_ancestorsTree[i];
- rv = currentTarget.fireListeners(type, true, e) && rv;
- }
- }
-
- if (!e.propagationStopped_) {
- currentTarget = (e.currentTarget = target);
- rv = currentTarget.fireListeners(type, true, e) && rv;
- if (!e.propagationStopped_) {
- rv = currentTarget.fireListeners(type, false, e) && rv;
- }
- }
-
- if (opt_ancestorsTree) {
- for (i = 0; !e.propagationStopped_ && i < opt_ancestorsTree.length; i++) {
- currentTarget = e.currentTarget = opt_ancestorsTree[i];
- rv = currentTarget.fireListeners(type, false, e) && rv;
- }
- }
- return rv;
- };
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