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// Copyright 2007 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 Component for an input field with bidi direction automatic
* detection. The input element directionality is automatically set according
* to the contents (value) of the element.
*
* @see ../demos/bidiinput.html
*/
goog.provide('goog.ui.BidiInput');
goog.require('goog.events');
goog.require('goog.events.InputHandler');
goog.require('goog.i18n.bidi');
goog.require('goog.ui.Component');
/**
* Default implementation of BidiInput.
*
* @param {goog.dom.DomHelper=} opt_domHelper Optional DOM helper.
* @constructor
* @extends {goog.ui.Component}
*/
goog.ui.BidiInput = function(opt_domHelper) {
goog.ui.Component.call(this, opt_domHelper);
};
goog.inherits(goog.ui.BidiInput, goog.ui.Component);
/**
* The input handler that provides the input event.
* @type {goog.events.InputHandler?}
* @private
*/
goog.ui.BidiInput.prototype.inputHandler_ = null;
/**
* Decorates the given HTML element as a BidiInput. The HTML element
* must be an input element with type='text' or a textarea element.
* Overrides {@link goog.ui.Component#decorateInternal}. Considered protected.
* @param {Element} element Element (HTML Input element) to decorate.
* @protected
* @override
*/
goog.ui.BidiInput.prototype.decorateInternal = function(element) {
goog.ui.BidiInput.superClass_.decorateInternal.call(this, element);
this.init_();
};
/**
* Creates the element for the text input.
* @protected
* @override
*/
goog.ui.BidiInput.prototype.createDom = function() {
this.setElementInternal(
this.getDomHelper().createDom('input', {'type': 'text'}));
this.init_();
};
/**
* Initializes the events and initial text direction.
* Called from either decorate or createDom, after the input field has
* been created.
* @private
*/
goog.ui.BidiInput.prototype.init_ = function() {
// Set initial direction by current text
this.setDirection_();
// Listen to value change events
this.inputHandler_ = new goog.events.InputHandler(this.getElement());
goog.events.listen(this.inputHandler_,
goog.events.InputHandler.EventType.INPUT,
this.setDirection_, false, this);
};
/**
* Set the direction of the input element based on the current value. If the
* value does not have any strongly directional characters, remove the dir
* attribute so that the direction is inherited instead.
* This method is called when the user changes the input element value, or
* when a program changes the value using
* {@link goog.ui.BidiInput#setValue}
* @private
*/
goog.ui.BidiInput.prototype.setDirection_ = function() {
var element = this.getElement();
var text = element.value;
switch (goog.i18n.bidi.estimateDirection(text)) {
case (goog.i18n.bidi.Dir.LTR):
element.dir = 'ltr';
break;
case (goog.i18n.bidi.Dir.RTL):
element.dir = 'rtl';
break;
default:
// Default for no direction, inherit from document.
element.removeAttribute('dir');
}
};
/**
* Returns the direction of the input element.
* @return {?string} Return 'rtl' for right-to-left text,
* 'ltr' for left-to-right text, or null if the value itself is not
* enough to determine directionality (e.g. an empty value), and the
* direction is inherited from a parent element (typically the body
* element).
*/
goog.ui.BidiInput.prototype.getDirection = function() {
var dir = this.getElement().dir;
if (dir == '') {
dir = null;
}
return dir;
};
/**
* Sets the value of the underlying input field, and sets the direction
* according to the given value.
* @param {string} value The Value to set in the underlying input field.
*/
goog.ui.BidiInput.prototype.setValue = function(value) {
this.getElement().value = value;
this.setDirection_();
};
/**
* Returns the value of the underlying input field.
* @return {string} Value of the underlying input field.
*/
goog.ui.BidiInput.prototype.getValue = function() {
return this.getElement().value;
};
/** @override */
goog.ui.BidiInput.prototype.disposeInternal = function() {
if (this.inputHandler_) {
goog.events.removeAll(this.inputHandler_);
this.inputHandler_.dispose();
this.inputHandler_ = null;
goog.ui.BidiInput.superClass_.disposeInternal.call(this);
}
};
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