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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.Button}s in App style.
*
* Based on ImagelessButtonRender. 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)
*/
goog.provide('goog.ui.style.app.ButtonRenderer');
goog.require('goog.dom.classes');
goog.require('goog.ui.Button');
goog.require('goog.ui.ControlContent');
goog.require('goog.ui.CustomButtonRenderer');
goog.require('goog.ui.INLINE_BLOCK_CLASSNAME');
goog.require('goog.ui.registry');
/**
* Custom renderer for {@link goog.ui.Button}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.CustomButtonRenderer}
*/
goog.ui.style.app.ButtonRenderer = function() {
goog.ui.CustomButtonRenderer.call(this);
};
goog.inherits(goog.ui.style.app.ButtonRenderer, goog.ui.CustomButtonRenderer);
goog.addSingletonGetter(goog.ui.style.app.ButtonRenderer);
/**
* Default CSS class to be applied to the root element of components rendered
* by this renderer.
* @type {string}
*/
goog.ui.style.app.ButtonRenderer.CSS_CLASS = goog.getCssName('goog-button');
/**
* Array of arrays of CSS classes that we want composite classes added and
* removed for in IE6 and lower as a workaround for lack of multi-class CSS
* selector support.
* @type {Array.<Array.<string>>}
*/
goog.ui.style.app.ButtonRenderer.IE6_CLASS_COMBINATIONS = [];
/**
* Returns the button's contents wrapped in the following DOM structure:
* <div class="goog-inline-block goog-button-base goog-button">
* <div class="goog-inline-block goog-button-base-outer-box">
* <div class="goog-button-base-inner-box">
* <div class="goog-button-base-pos">
* <div class="goog-button-base-top-shadow"> </div>
* <div class="goog-button-base-content">Contents...</div>
* </div>
* </div>
* </div>
* </div>
* @override
*/
goog.ui.style.app.ButtonRenderer.prototype.createDom;
/** @override */
goog.ui.style.app.ButtonRenderer.prototype.getContentElement = function(
element) {
return element && /** @type {Element} */(
element.firstChild.firstChild.firstChild.lastChild);
};
/**
* 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-button-base-outer-box">
* <div class="goog-inline-block goog-button-base-inner-box">
* <div class="goog-button-base-pos">
* <div class="goog-button-base-top-shadow"> </div>
* <div class="goog-button-base-content">Contents...</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.style.app.ButtonRenderer.prototype.createButton = function(content,
dom) {
var baseClass = this.getStructuralCssClass();
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'), content))));
};
/**
* 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.style.app.ButtonRenderer.prototype.hasBoxStructure = function(
button, element) {
var baseClass = this.getStructuralCssClass();
var outer = button.getDomHelper().getFirstElementChild(element);
var outerClassName = goog.getCssName(baseClass, 'outer-box');
if (outer && goog.dom.classes.has(outer, outerClassName)) {
var inner = button.getDomHelper().getFirstElementChild(outer);
var innerClassName = goog.getCssName(baseClass, 'inner-box');
if (inner && goog.dom.classes.has(inner, innerClassName)) {
var pos = button.getDomHelper().getFirstElementChild(inner);
var posClassName = goog.getCssName(baseClass, 'pos');
if (pos && goog.dom.classes.has(pos, posClassName)) {
var shadow = button.getDomHelper().getFirstElementChild(pos);
var shadowClassName = goog.getCssName(baseClass, 'top-shadow');
if (shadow && goog.dom.classes.has(shadow, shadowClassName)) {
var content = button.getDomHelper().getNextElementSibling(shadow);
var contentClassName = goog.getCssName(baseClass, 'content');
if (content && goog.dom.classes.has(content, contentClassName)) {
// We have a proper box structure.
return true;
}
}
}
}
}
return false;
};
/** @override */
goog.ui.style.app.ButtonRenderer.prototype.getCssClass = function() {
return goog.ui.style.app.ButtonRenderer.CSS_CLASS;
};
/** @override */
goog.ui.style.app.ButtonRenderer.prototype.getStructuralCssClass = function() {
// TODO(user): extract to a constant.
return goog.getCssName('goog-button-base');
};
/** @override */
goog.ui.style.app.ButtonRenderer.prototype.getIe6ClassCombinations =
function() {
return goog.ui.style.app.ButtonRenderer.IE6_CLASS_COMBINATIONS;
};
// Register a decorator factory function for goog.ui.style.app.ButtonRenderer.
goog.ui.registry.setDecoratorByClassName(
goog.ui.style.app.ButtonRenderer.CSS_CLASS,
function() {
return new goog.ui.Button(null,
goog.ui.style.app.ButtonRenderer.getInstance());
});
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