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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.Tab}s. Based on the
* original {@code TabPane} code.
*
* @author attila@google.com (Attila Bodis)
*/
goog.provide('goog.ui.TabRenderer');
goog.require('goog.a11y.aria.Role');
goog.require('goog.ui.Component');
goog.require('goog.ui.ControlRenderer');
/**
* Default renderer for {@link goog.ui.Tab}s, based on the {@code TabPane} code.
* @constructor
* @extends {goog.ui.ControlRenderer}
*/
goog.ui.TabRenderer = function() {
goog.ui.ControlRenderer.call(this);
};
goog.inherits(goog.ui.TabRenderer, goog.ui.ControlRenderer);
goog.addSingletonGetter(goog.ui.TabRenderer);
/**
* Default CSS class to be applied to the root element of components rendered
* by this renderer.
* @type {string}
*/
goog.ui.TabRenderer.CSS_CLASS = goog.getCssName('goog-tab');
/**
* Returns the CSS class name to be applied to the root element of all tabs
* rendered or decorated using this renderer.
* @return {string} Renderer-specific CSS class name.
* @override
*/
goog.ui.TabRenderer.prototype.getCssClass = function() {
return goog.ui.TabRenderer.CSS_CLASS;
};
/**
* Returns the ARIA role to be applied to the tab element.
* See http://wiki/Main/ARIA for more info.
* @return {goog.a11y.aria.Role} ARIA role.
* @override
*/
goog.ui.TabRenderer.prototype.getAriaRole = function() {
return goog.a11y.aria.Role.TAB;
};
/**
* Returns the tab's contents wrapped in a DIV, with the renderer's own CSS
* class and additional state-specific classes applied to it. Creates the
* following DOM structure:
*
* <div class="goog-tab" title="Title">Content</div>
*
* @param {goog.ui.Control} tab Tab to render.
* @return {Element} Root element for the tab.
* @override
*/
goog.ui.TabRenderer.prototype.createDom = function(tab) {
var element = goog.ui.TabRenderer.superClass_.createDom.call(this, tab);
var tooltip = tab.getTooltip();
if (tooltip) {
// Only update the element if the tab has a tooltip.
this.setTooltip(element, tooltip);
}
return element;
};
/**
* Decorates the element with the tab. Initializes the tab's ID, content,
* tooltip, and state based on the ID of the element, its title, child nodes,
* and CSS classes, respectively. Returns the element.
* @param {goog.ui.Control} tab Tab to decorate the element.
* @param {Element} element Element to decorate.
* @return {Element} Decorated element.
* @override
*/
goog.ui.TabRenderer.prototype.decorate = function(tab, element) {
element = goog.ui.TabRenderer.superClass_.decorate.call(this, tab, element);
var tooltip = this.getTooltip(element);
if (tooltip) {
// Only update the tab if the element has a tooltip.
tab.setTooltipInternal(tooltip);
}
// If the tab is selected and hosted in a tab bar, update the tab bar's
// selection model.
if (tab.isSelected()) {
var tabBar = tab.getParent();
if (tabBar && goog.isFunction(tabBar.setSelectedTab)) {
// We need to temporarily deselect the tab, so the tab bar can re-select
// it and thereby correctly initialize its state. We use the protected
// setState() method to avoid dispatching useless events.
tab.setState(goog.ui.Component.State.SELECTED, false);
tabBar.setSelectedTab(tab);
}
}
return element;
};
/**
* Takes a tab's root element, and returns its tooltip text, or the empty
* string if the element has no tooltip.
* @param {Element} element The tab's root element.
* @return {string} The tooltip text (empty string if none).
*/
goog.ui.TabRenderer.prototype.getTooltip = function(element) {
return element.title || '';
};
/**
* Takes a tab's root element and a tooltip string, and updates the element
* with the new tooltip. If the new tooltip is null or undefined, sets the
* element's title to the empty string.
* @param {Element} element The tab's root element.
* @param {string|null|undefined} tooltip New tooltip text (if any).
*/
goog.ui.TabRenderer.prototype.setTooltip = function(element, tooltip) {
if (element) {
element.title = tooltip || '';
}
};
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