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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 An alternative custom button renderer that uses even more CSS
* voodoo than the default implementation to render custom buttons with fake
* rounded corners and dimensionality (via a subtle flat shadow on the bottom
* half of the button) without the use of images.
*
* Based on the Custom Buttons 3.1 visual specification, see
* http://go/custombuttons
*
* @author eae@google.com (Emil A Eklund)
* @author dalewis@google.com (Darren Lewis)
* @see ../demos/imagelessmenubutton.html
*/
goog.provide('goog.ui.ImagelessMenuButtonRenderer');
goog.require('goog.dom');
goog.require('goog.dom.TagName');
goog.require('goog.dom.classes');
goog.require('goog.ui.ControlContent');
goog.require('goog.ui.INLINE_BLOCK_CLASSNAME');
goog.require('goog.ui.MenuButton');
goog.require('goog.ui.MenuButtonRenderer');
goog.require('goog.ui.registry');
/**
* Custom renderer for {@link goog.ui.MenuButton}s. Imageless buttons can
* contain almost arbitrary HTML content, will flow like inline elements, but
* can be styled like block-level elements.
*
* @constructor
* @extends {goog.ui.MenuButtonRenderer}
*/
goog.ui.ImagelessMenuButtonRenderer = function() {
goog.ui.MenuButtonRenderer.call(this);
};
goog.inherits(goog.ui.ImagelessMenuButtonRenderer, goog.ui.MenuButtonRenderer);
/**
* The singleton instance of this renderer class.
* @type {goog.ui.ImagelessMenuButtonRenderer?}
* @private
*/
goog.ui.ImagelessMenuButtonRenderer.instance_ = null;
goog.addSingletonGetter(goog.ui.ImagelessMenuButtonRenderer);
/**
* Default CSS class to be applied to the root element of components rendered
* by this renderer.
* @type {string}
*/
goog.ui.ImagelessMenuButtonRenderer.CSS_CLASS =
goog.getCssName('goog-imageless-button');
/** @override */
goog.ui.ImagelessMenuButtonRenderer.prototype.getContentElement = function(
element) {
if (element) {
var captionElem = goog.dom.getElementsByTagNameAndClass(
'*', goog.getCssName(this.getCssClass(), 'caption'), element)[0];
return captionElem;
}
return null;
};
/**
* Returns true if this renderer can decorate the element. Overrides
* {@link goog.ui.MenuButtonRenderer#canDecorate} by returning true if the
* element is a DIV, false otherwise.
* @param {Element} element Element to decorate.
* @return {boolean} Whether the renderer can decorate the element.
* @override
*/
goog.ui.ImagelessMenuButtonRenderer.prototype.canDecorate = function(element) {
return element.tagName == goog.dom.TagName.DIV;
};
/**
* Takes a text caption or existing DOM structure, and returns the content
* wrapped in a pseudo-rounded-corner box. Creates the following DOM structure:
* <div class="goog-inline-block goog-imageless-button">
* <div class="goog-inline-block goog-imageless-button-outer-box">
* <div class="goog-imageless-button-inner-box">
* <div class="goog-imageless-button-pos-box">
* <div class="goog-imageless-button-top-shadow"> </div>
* <div class="goog-imageless-button-content
* goog-imageless-menubutton-caption">Contents...
* </div>
* <div class="goog-imageless-menubutton-dropdown"></div>
* </div>
* </div>
* </div>
* </div>
* Used by both {@link #createDom} and {@link #decorate}. To be overridden
* by subclasses.
* @param {goog.ui.ControlContent} content Text caption or DOM structure to wrap
* in a box.
* @param {goog.dom.DomHelper} dom DOM helper, used for document interaction.
* @return {Element} Pseudo-rounded-corner box containing the content.
* @override
*/
goog.ui.ImagelessMenuButtonRenderer.prototype.createButton = function(content,
dom) {
var baseClass = this.getCssClass();
var inlineBlock = goog.ui.INLINE_BLOCK_CLASSNAME + ' ';
return dom.createDom('div',
inlineBlock + goog.getCssName(baseClass, 'outer-box'),
dom.createDom('div',
inlineBlock + goog.getCssName(baseClass, 'inner-box'),
dom.createDom('div', goog.getCssName(baseClass, 'pos'),
dom.createDom('div', goog.getCssName(baseClass, 'top-shadow'),
'\u00A0'),
dom.createDom('div', [goog.getCssName(baseClass, 'content'),
goog.getCssName(baseClass, 'caption'),
goog.getCssName('goog-inline-block')],
content),
dom.createDom('div', [goog.getCssName(baseClass, 'dropdown'),
goog.getCssName('goog-inline-block')]))));
};
/**
* Check if the button's element has a box structure.
* @param {goog.ui.Button} button Button instance whose structure is being
* checked.
* @param {Element} element Element of the button.
* @return {boolean} Whether the element has a box structure.
* @protected
* @override
*/
goog.ui.ImagelessMenuButtonRenderer.prototype.hasBoxStructure = function(
button, element) {
var outer = button.getDomHelper().getFirstElementChild(element);
var outerClassName = goog.getCssName(this.getCssClass(), 'outer-box');
if (outer && goog.dom.classes.has(outer, outerClassName)) {
var inner = button.getDomHelper().getFirstElementChild(outer);
var innerClassName = goog.getCssName(this.getCssClass(), 'inner-box');
if (inner && goog.dom.classes.has(inner, innerClassName)) {
var pos = button.getDomHelper().getFirstElementChild(inner);
var posClassName = goog.getCssName(this.getCssClass(), 'pos');
if (pos && goog.dom.classes.has(pos, posClassName)) {
var shadow = button.getDomHelper().getFirstElementChild(pos);
var shadowClassName = goog.getCssName(
this.getCssClass(), 'top-shadow');
if (shadow && goog.dom.classes.has(shadow, shadowClassName)) {
var content = button.getDomHelper().getNextElementSibling(shadow);
var contentClassName = goog.getCssName(
this.getCssClass(), 'content');
if (content && goog.dom.classes.has(content, contentClassName)) {
// We have a proper box structure.
return true;
}
}
}
}
}
return false;
};
/**
* Returns the CSS class to be applied to the root element of components
* rendered using this renderer.
* @return {string} Renderer-specific CSS class.
* @override
*/
goog.ui.ImagelessMenuButtonRenderer.prototype.getCssClass = function() {
return goog.ui.ImagelessMenuButtonRenderer.CSS_CLASS;
};
// Register a decorator factory function for
// goog.ui.ImagelessMenuButtonRenderer. Since we're using goog-imageless-button
// as the base class in order to get the same styling as
// goog.ui.ImagelessButtonRenderer, we need to be explicit about giving
// goog-imageless-menu-button here.
goog.ui.registry.setDecoratorByClassName(
goog.getCssName('goog-imageless-menu-button'),
function() {
return new goog.ui.MenuButton(null, null,
goog.ui.ImagelessMenuButtonRenderer.getInstance());
});
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