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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 Default renderer for {@link goog.ui.TabBar}s. Based on the
* original {@code TabPane} code.
*
* @author attila@google.com (Attila Bodis)
* @author eae@google.com (Emil A. Eklund)
*/
goog.provide('goog.ui.TabBarRenderer');
goog.require('goog.dom.a11y.Role');
goog.require('goog.object');
goog.require('goog.ui.ContainerRenderer');
/**
* Default renderer for {@link goog.ui.TabBar}s, based on the {@code TabPane}
* code. The tab bar's DOM structure is determined by its orientation and
* location relative to tab contents. For example, a horizontal tab bar
* located above tab contents looks like this:
* <pre>
* <div class="goog-tab-bar goog-tab-bar-horizontal goog-tab-bar-top">
* ...(tabs here)...
* </div>
* </pre>
* @constructor
* @extends {goog.ui.ContainerRenderer}
*/
goog.ui.TabBarRenderer = function() {
goog.ui.ContainerRenderer.call(this);
};
goog.inherits(goog.ui.TabBarRenderer, goog.ui.ContainerRenderer);
goog.addSingletonGetter(goog.ui.TabBarRenderer);
/**
* Default CSS class to be applied to the root element of components rendered
* by this renderer.
* @type {string}
*/
goog.ui.TabBarRenderer.CSS_CLASS = goog.getCssName('goog-tab-bar');
/**
* Returns the CSS class name to be applied to the root element of all tab bars
* rendered or decorated using this renderer.
* @return {string} Renderer-specific CSS class name.
* @override
*/
goog.ui.TabBarRenderer.prototype.getCssClass = function() {
return goog.ui.TabBarRenderer.CSS_CLASS;
};
/**
* Returns the ARIA role to be applied to the tab bar element.
* See http://wiki/Main/ARIA for more info.
* @return {goog.dom.a11y.Role} ARIA role.
* @override
*/
goog.ui.TabBarRenderer.prototype.getAriaRole = function() {
return goog.dom.a11y.Role.TAB_LIST;
};
/**
* Sets the tab bar's state based on the given CSS class name, encountered
* during decoration. Overrides the superclass implementation by recognizing
* class names representing tab bar orientation and location.
* @param {goog.ui.Container} tabBar Tab bar to configure.
* @param {string} className CSS class name.
* @param {string} baseClass Base class name used as the root of state-specific
* class names (typically the renderer's own class name).
* @protected
* @override
*/
goog.ui.TabBarRenderer.prototype.setStateFromClassName = function(tabBar,
className, baseClass) {
// Create the class-to-location lookup table on first access.
if (!this.locationByClass_) {
this.createLocationByClassMap_();
}
// If the class name corresponds to a location, update the tab bar's location;
// otherwise let the superclass handle it.
var location = this.locationByClass_[className];
if (location) {
tabBar.setLocation(location);
} else {
goog.ui.TabBarRenderer.superClass_.setStateFromClassName.call(this, tabBar,
className, baseClass);
}
};
/**
* Returns all CSS class names applicable to the tab bar, based on its state.
* Overrides the superclass implementation by appending the location-specific
* class name to the list.
* @param {goog.ui.Container} tabBar Tab bar whose CSS classes are to be
* returned.
* @return {Array.<string>} Array of CSS class names applicable to the tab bar.
* @override
*/
goog.ui.TabBarRenderer.prototype.getClassNames = function(tabBar) {
var classNames = goog.ui.TabBarRenderer.superClass_.getClassNames.call(this,
tabBar);
// Create the location-to-class lookup table on first access.
if (!this.classByLocation_) {
this.createClassByLocationMap_();
}
// Apped the class name corresponding to the tab bar's location to the list.
classNames.push(this.classByLocation_[tabBar.getLocation()]);
return classNames;
};
/**
* Creates the location-to-class lookup table.
* @private
*/
goog.ui.TabBarRenderer.prototype.createClassByLocationMap_ = function() {
var baseClass = this.getCssClass();
/**
* Map of locations to location-specific structural class names,
* precomputed and cached on first use to minimize object allocations
* and string concatenation.
* @type {Object}
* @private
*/
this.classByLocation_ = goog.object.create(
goog.ui.TabBar.Location.TOP, goog.getCssName(baseClass, 'top'),
goog.ui.TabBar.Location.BOTTOM, goog.getCssName(baseClass, 'bottom'),
goog.ui.TabBar.Location.START, goog.getCssName(baseClass, 'start'),
goog.ui.TabBar.Location.END, goog.getCssName(baseClass, 'end'));
};
/**
* Creates the class-to-location lookup table, used during decoration.
* @private
*/
goog.ui.TabBarRenderer.prototype.createLocationByClassMap_ = function() {
// We need the classByLocation_ map so we can transpose it.
if (!this.classByLocation_) {
this.createClassByLocationMap_();
}
/**
* Map of location-specific structural class names to locations, used during
* element decoration. Precomputed and cached on first use to minimize object
* allocations and string concatenation.
* @type {Object}
* @private
*/
this.locationByClass_ = goog.object.transpose(this.classByLocation_);
};
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