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// Copyright 2008 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 Renderer for {@link goog.ui.Menu}s.
*
* @author robbyw@google.com (Robby Walker)
* @author pupius@google.com (Daniel Pupius)
*/
goog.provide('goog.ui.MenuRenderer');
goog.require('goog.dom');
goog.require('goog.dom.a11y');
goog.require('goog.dom.a11y.Role');
goog.require('goog.dom.a11y.State');
goog.require('goog.ui.ContainerRenderer');
goog.require('goog.ui.Separator');
/**
* Default renderer for {@link goog.ui.Menu}s, based on {@link
* goog.ui.ContainerRenderer}.
* @constructor
* @extends {goog.ui.ContainerRenderer}
*/
goog.ui.MenuRenderer = function() {
goog.ui.ContainerRenderer.call(this);
};
goog.inherits(goog.ui.MenuRenderer, goog.ui.ContainerRenderer);
goog.addSingletonGetter(goog.ui.MenuRenderer);
/**
* Default CSS class to be applied to the root element of toolbars rendered
* by this renderer.
* @type {string}
*/
goog.ui.MenuRenderer.CSS_CLASS = goog.getCssName('goog-menu');
/**
* Returns the ARIA role to be applied to menus.
* @return {string} ARIA role.
* @override
*/
goog.ui.MenuRenderer.prototype.getAriaRole = function() {
return goog.dom.a11y.Role.MENU;
};
/**
* Returns whether the element is a UL or acceptable to our superclass.
* @param {Element} element Element to decorate.
* @return {boolean} Whether the renderer can decorate the element.
* @override
*/
goog.ui.MenuRenderer.prototype.canDecorate = function(element) {
return element.tagName == 'UL' ||
goog.ui.MenuRenderer.superClass_.canDecorate.call(this, element);
};
/**
* Inspects the element, and creates an instance of {@link goog.ui.Control} or
* an appropriate subclass best suited to decorate it. Overrides the superclass
* implementation by recognizing HR elements as separators.
* @param {Element} element Element to decorate.
* @return {goog.ui.Control?} A new control suitable to decorate the element
* (null if none).
* @override
*/
goog.ui.MenuRenderer.prototype.getDecoratorForChild = function(element) {
return element.tagName == 'HR' ?
new goog.ui.Separator() :
goog.ui.MenuRenderer.superClass_.getDecoratorForChild.call(this,
element);
};
/**
* Returns whether the given element is contained in the menu's DOM.
* @param {goog.ui.Menu} menu The menu to test.
* @param {Element} element The element to test.
* @return {boolean} Whether the given element is contained in the menu.
*/
goog.ui.MenuRenderer.prototype.containsElement = function(menu, element) {
return goog.dom.contains(menu.getElement(), element);
};
/**
* Returns the CSS class to be applied to the root element of containers
* rendered using this renderer.
* @return {string} Renderer-specific CSS class.
* @override
*/
goog.ui.MenuRenderer.prototype.getCssClass = function() {
return goog.ui.MenuRenderer.CSS_CLASS;
};
/** @override */
goog.ui.MenuRenderer.prototype.initializeDom = function(container) {
goog.ui.MenuRenderer.superClass_.initializeDom.call(this, container);
var element = container.getElement();
goog.dom.a11y.setState(element, goog.dom.a11y.State.HASPOPUP, 'true');
};
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