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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.ColorMenuButton}s.
*
* @author robbyw@google.com (Robby Walker)
* @author attila@google.com (Attila Bodis)
*/
goog.provide('goog.ui.ColorMenuButtonRenderer');
goog.require('goog.asserts');
goog.require('goog.color');
goog.require('goog.dom.TagName');
goog.require('goog.dom.classlist');
goog.require('goog.ui.MenuButtonRenderer');
goog.require('goog.userAgent');
/**
* Renderer for {@link goog.ui.ColorMenuButton}s.
* @constructor
* @extends {goog.ui.MenuButtonRenderer}
*/
goog.ui.ColorMenuButtonRenderer = function() {
goog.ui.MenuButtonRenderer.call(this);
};
goog.inherits(goog.ui.ColorMenuButtonRenderer, goog.ui.MenuButtonRenderer);
goog.addSingletonGetter(goog.ui.ColorMenuButtonRenderer);
/**
* Default CSS class to be applied to the root element of components rendered
* by this renderer.
* @type {string}
*/
goog.ui.ColorMenuButtonRenderer.CSS_CLASS =
goog.getCssName('goog-color-menu-button');
/**
* Overrides the superclass implementation by wrapping the caption text or DOM
* structure in a color indicator element. Creates the following DOM structure:
*
* <div class="goog-inline-block goog-menu-button-caption">
* <div class="goog-color-menu-button-indicator">
* Contents...
* </div>
* </div>
*
* The 'goog-color-menu-button-indicator' style should be defined to have a
* bottom border of nonzero width and a default color that blends into its
* background.
* @param {goog.ui.ControlContent} content Text caption or DOM structure.
* @param {goog.dom.DomHelper} dom DOM helper, used for document interaction.
* @return {Element} Caption element.
* @override
*/
goog.ui.ColorMenuButtonRenderer.prototype.createCaption = function(
content, dom) {
return goog.ui.ColorMenuButtonRenderer.superClass_.createCaption.call(
this, goog.ui.ColorMenuButtonRenderer.wrapCaption(content, dom), dom);
};
/**
* Wrap a caption in a div with the color-menu-button-indicator CSS class.
* @param {goog.ui.ControlContent} content Text caption or DOM structure.
* @param {goog.dom.DomHelper} dom DOM helper, used for document interaction.
* @return {!Element} Caption element.
*/
goog.ui.ColorMenuButtonRenderer.wrapCaption = function(content, dom) {
return dom.createDom(
goog.dom.TagName.DIV,
goog.getCssName(goog.ui.ColorMenuButtonRenderer.CSS_CLASS, 'indicator'),
content);
};
/**
* Takes a color menu button control's root element and a value object
* (which is assumed to be a color), and updates the button's DOM to reflect
* the new color. Overrides {@link goog.ui.ButtonRenderer#setValue}.
* @param {Element} element The button control's root element (if rendered).
* @param {*} value New value; assumed to be a color spec string.
* @override
*/
goog.ui.ColorMenuButtonRenderer.prototype.setValue = function(element, value) {
if (element) {
goog.ui.ColorMenuButtonRenderer.setCaptionValue(
this.getContentElement(element), value);
}
};
/**
* Takes a control's content element and a value object (which is assumed
* to be a color), and updates its DOM to reflect the new color.
* @param {Element} caption A content element of a control.
* @param {*} value New value; assumed to be a color spec string.
*/
goog.ui.ColorMenuButtonRenderer.setCaptionValue = function(caption, value) {
// Assume that the caption's first child is the indicator.
if (caption && caption.firstChild) {
// Normalize the value to a hex color spec or null (otherwise setting
// borderBottomColor will cause a JS error on IE).
var hexColor;
var strValue = /** @type {string} */ (value);
hexColor = strValue && goog.color.isValidColor(strValue) ?
goog.color.parse(strValue).hex :
null;
// Stupid IE6/7 doesn't do transparent borders.
// TODO(attila): Add user-agent version check when IE8 comes out...
caption.firstChild.style.borderBottomColor =
hexColor || (goog.userAgent.IE ? '' : 'transparent');
}
};
/**
* Initializes the button's DOM when it enters the document. Overrides the
* superclass implementation by making sure the button's color indicator is
* initialized.
* @param {goog.ui.Control} button goog.ui.ColorMenuButton whose DOM is to be
* initialized as it enters the document.
* @override
*/
goog.ui.ColorMenuButtonRenderer.prototype.initializeDom = function(button) {
var buttonElement = button.getElement();
goog.asserts.assert(buttonElement);
this.setValue(buttonElement, button.getValue());
goog.dom.classlist.add(
buttonElement, goog.ui.ColorMenuButtonRenderer.CSS_CLASS);
goog.ui.ColorMenuButtonRenderer.superClass_.initializeDom.call(this, button);
};
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