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// Copyright 2010 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 Native browser textarea renderer for {@link goog.ui.Textarea}s.
*/
goog.provide('goog.ui.TextareaRenderer');
goog.require('goog.ui.Component.State');
goog.require('goog.ui.ControlRenderer');
/**
* Renderer for {@link goog.ui.Textarea}s. Renders and decorates native HTML
* textarea elements. Since native HTML textareas have built-in support for
* many features, overrides many expensive (and redundant) superclass methods to
* be no-ops.
* @constructor
* @extends {goog.ui.ControlRenderer}
*/
goog.ui.TextareaRenderer = function() {
goog.ui.ControlRenderer.call(this);
};
goog.inherits(goog.ui.TextareaRenderer, goog.ui.ControlRenderer);
goog.addSingletonGetter(goog.ui.TextareaRenderer);
/**
* Default CSS class to be applied to the root element of components rendered
* by this renderer.
* @type {string}
*/
goog.ui.TextareaRenderer.CSS_CLASS = goog.getCssName('goog-textarea');
/** @override */
goog.ui.TextareaRenderer.prototype.getAriaRole = function() {
// textareas don't need ARIA roles to be recognized by screen readers.
return undefined;
};
/** @override */
goog.ui.TextareaRenderer.prototype.decorate = function(control, element) {
this.setUpTextarea_(control);
goog.ui.TextareaRenderer.superClass_.decorate.call(this, control,
element);
control.setContent(element.value);
return element;
};
/**
* Returns the textarea's contents wrapped in an HTML textarea element. Sets
* the textarea's disabled attribute as needed.
* @param {goog.ui.Control} textarea Textarea to render.
* @return {Element} Root element for the Textarea control (an HTML textarea
* element).
* @override
*/
goog.ui.TextareaRenderer.prototype.createDom = function(textarea) {
this.setUpTextarea_(textarea);
var element = textarea.getDomHelper().createDom('textarea', {
'class': this.getClassNames(textarea).join(' '),
'disabled': !textarea.isEnabled()
}, textarea.getContent() || '');
return element;
};
/**
* Overrides {@link goog.ui.TextareaRenderer#canDecorate} by returning true only
* if the element is an HTML textarea.
* @param {Element} element Element to decorate.
* @return {boolean} Whether the renderer can decorate the element.
* @override
*/
goog.ui.TextareaRenderer.prototype.canDecorate = function(element) {
return element.tagName == goog.dom.TagName.TEXTAREA;
};
/**
* Textareas natively support right-to-left rendering.
* @override
*/
goog.ui.TextareaRenderer.prototype.setRightToLeft = goog.nullFunction;
/**
* Textareas are always focusable as long as they are enabled.
* @override
*/
goog.ui.TextareaRenderer.prototype.isFocusable = function(textarea) {
return textarea.isEnabled();
};
/**
* Textareas natively support keyboard focus.
* @override
*/
goog.ui.TextareaRenderer.prototype.setFocusable = goog.nullFunction;
/**
* Textareas also expose the DISABLED state in the HTML textarea's
* {@code disabled} attribute.
* @override
*/
goog.ui.TextareaRenderer.prototype.setState = function(textarea, state,
enable) {
goog.ui.TextareaRenderer.superClass_.setState.call(this, textarea, state,
enable);
var element = textarea.getElement();
if (element && state == goog.ui.Component.State.DISABLED) {
element.disabled = enable;
}
};
/**
* Textareas don't need ARIA states to support accessibility, so this is
* a no-op.
* @override
*/
goog.ui.TextareaRenderer.prototype.updateAriaState = goog.nullFunction;
/**
* Sets up the textarea control such that it doesn't waste time adding
* functionality that is already natively supported by browser
* textareas.
* @param {goog.ui.Control} textarea Textarea control to configure.
* @private
*/
goog.ui.TextareaRenderer.prototype.setUpTextarea_ = function(textarea) {
textarea.setHandleMouseEvents(false);
textarea.setAutoStates(goog.ui.Component.State.ALL, false);
textarea.setSupportedState(goog.ui.Component.State.FOCUSED, false);
};
/** @override **/
goog.ui.TextareaRenderer.prototype.setContent = function(element, value) {
if (element) {
element.value = value;
}
};
/** @override **/
goog.ui.TextareaRenderer.prototype.getCssClass = function() {
return goog.ui.TextareaRenderer.CSS_CLASS;
};
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