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// Copyright 2009 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 Action event wrapper implementation.
* @author eae@google.com (Emil A Eklund)
*/
goog.provide('goog.events.actionEventWrapper');
goog.require('goog.a11y.aria');
goog.require('goog.a11y.aria.Role');
goog.require('goog.dom');
goog.require('goog.events');
/** @suppress {extraRequire} */
goog.require('goog.events.EventHandler');
goog.require('goog.events.EventType');
goog.require('goog.events.EventWrapper');
goog.require('goog.events.KeyCodes');
goog.require('goog.userAgent');
/**
* Event wrapper for action handling. Fires when an element is activated either
* by clicking it or by focusing it and pressing Enter.
*
* @constructor
* @implements {goog.events.EventWrapper}
* @private
*/
goog.events.ActionEventWrapper_ = function() {};
/**
* @interface
* @private
*/
goog.events.ActionEventWrapper_.FunctionExtension_ = function() {};
/** @type {!Object|undefined} */
goog.events.ActionEventWrapper_.FunctionExtension_.prototype.scope_;
/** @type {function(?):?|{handleEvent:function(?):?}|null} */
goog.events.ActionEventWrapper_.FunctionExtension_.prototype.listener_;
/**
* Singleton instance of ActionEventWrapper_.
* @type {goog.events.ActionEventWrapper_}
*/
goog.events.actionEventWrapper = new goog.events.ActionEventWrapper_();
/**
* Event types used by the wrapper.
*
* @type {Array<goog.events.EventType>}
* @private
*/
goog.events.ActionEventWrapper_.EVENT_TYPES_ = [
goog.events.EventType.CLICK,
goog.userAgent.GECKO ? goog.events.EventType.KEYPRESS :
goog.events.EventType.KEYDOWN,
goog.events.EventType.KEYUP
];
/**
* Adds an event listener using the wrapper on a DOM Node or an object that has
* implemented {@link goog.events.EventTarget}. A listener can only be added
* once to an object.
*
* @param {goog.events.ListenableType} target The target to listen to events on.
* @param {function(?):?|{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 {Object=} opt_scope Element in whose scope to call the listener.
* @param {goog.events.EventHandler=} opt_eventHandler Event handler to add
* listener to.
* @override
*/
goog.events.ActionEventWrapper_.prototype.listen = function(
target, listener, opt_capt, opt_scope, opt_eventHandler) {
var callback = function(e) {
var listenerFn = goog.events.wrapListener(listener);
var role = goog.dom.isElement(e.target) ?
goog.a11y.aria.getRole(/** @type {!Element} */ (e.target)) :
null;
if (e.type == goog.events.EventType.CLICK && e.isMouseActionButton()) {
listenerFn.call(opt_scope, e);
} else if (
(e.keyCode == goog.events.KeyCodes.ENTER ||
e.keyCode == goog.events.KeyCodes.MAC_ENTER) &&
e.type != goog.events.EventType.KEYUP) {
// convert keydown to keypress for backward compatibility.
e.type = goog.events.EventType.KEYPRESS;
listenerFn.call(opt_scope, e);
} else if (
e.keyCode == goog.events.KeyCodes.SPACE &&
e.type == goog.events.EventType.KEYUP &&
(role == goog.a11y.aria.Role.BUTTON ||
role == goog.a11y.aria.Role.TAB)) {
listenerFn.call(opt_scope, e);
e.preventDefault();
}
};
callback.listener_ = listener;
callback.scope_ = opt_scope;
if (opt_eventHandler) {
opt_eventHandler.listen(
target, goog.events.ActionEventWrapper_.EVENT_TYPES_, callback,
opt_capt);
} else {
goog.events.listen(
target, goog.events.ActionEventWrapper_.EVENT_TYPES_, callback,
opt_capt);
}
};
/**
* Removes an event listener added using goog.events.EventWrapper.listen.
*
* @param {goog.events.ListenableType} target The node to remove listener from.
* @param {function(?):?|{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 {Object=} opt_scope Element in whose scope to call the listener.
* @param {goog.events.EventHandler=} opt_eventHandler Event handler to remove
* listener from.
* @override
*/
goog.events.ActionEventWrapper_.prototype.unlisten = function(
target, listener, opt_capt, opt_scope, opt_eventHandler) {
for (var type, j = 0; type = goog.events.ActionEventWrapper_.EVENT_TYPES_[j];
j++) {
var listeners = goog.events.getListeners(target, type, !!opt_capt);
for (var obj, i = 0; obj = listeners[i]; i++) {
var objListener =
/** @type {!goog.events.ActionEventWrapper_.FunctionExtension_} */ (
obj.listener);
if (objListener.listener_ == listener &&
objListener.scope_ == opt_scope) {
if (opt_eventHandler) {
opt_eventHandler.unlisten(
target, type, obj.listener, opt_capt, opt_scope);
} else {
goog.events.unlisten(target, type, obj.listener, opt_capt, opt_scope);
}
break;
}
}
}
};
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