270 lines
7.8 KiB
JavaScript
270 lines
7.8 KiB
JavaScript
// Copyright 2009 The Closure Library Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS-IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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/**
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* @fileoverview Tristate checkbox widget.
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*
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* @see ../demos/checkbox.html
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*/
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goog.provide('goog.ui.Checkbox');
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goog.provide('goog.ui.Checkbox.State');
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goog.require('goog.a11y.aria');
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goog.require('goog.a11y.aria.State');
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goog.require('goog.asserts');
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goog.require('goog.events.EventType');
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goog.require('goog.events.KeyCodes');
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goog.require('goog.ui.CheckboxRenderer');
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goog.require('goog.ui.Component.EventType');
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goog.require('goog.ui.Component.State');
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goog.require('goog.ui.Control');
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goog.require('goog.ui.registry');
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/**
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* 3-state checkbox widget. Fires CHECK or UNCHECK events before toggled and
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* CHANGE event after toggled by user.
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* The checkbox can also be enabled/disabled and get focused and highlighted.
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*
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* @param {goog.ui.Checkbox.State=} opt_checked Checked state to set.
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* @param {goog.dom.DomHelper=} opt_domHelper Optional DOM helper, used for
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* document interaction.
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* @param {goog.ui.CheckboxRenderer=} opt_renderer Renderer used to render or
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* decorate the checkbox; defaults to {@link goog.ui.CheckboxRenderer}.
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* @constructor
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* @extends {goog.ui.Control}
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*/
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goog.ui.Checkbox = function(opt_checked, opt_domHelper, opt_renderer) {
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var renderer = opt_renderer || goog.ui.CheckboxRenderer.getInstance();
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goog.ui.Control.call(this, null, renderer, opt_domHelper);
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// The checkbox maintains its own tri-state CHECKED state.
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// The control class maintains DISABLED, ACTIVE, and FOCUSED (which enable tab
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// navigation, and keyHandling with SPACE).
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/**
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* Checked state of the checkbox.
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* @type {goog.ui.Checkbox.State}
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* @private
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*/
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this.checked_ = goog.isDef(opt_checked) ?
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opt_checked : goog.ui.Checkbox.State.UNCHECKED;
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};
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goog.inherits(goog.ui.Checkbox, goog.ui.Control);
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/**
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* Possible checkbox states.
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* @enum {?boolean}
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*/
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goog.ui.Checkbox.State = {
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CHECKED: true,
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UNCHECKED: false,
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UNDETERMINED: null
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};
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/**
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* Label element bound to the checkbox.
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* @type {Element}
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* @private
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*/
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goog.ui.Checkbox.prototype.label_ = null;
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/**
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* @return {goog.ui.Checkbox.State} Checked state of the checkbox.
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*/
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goog.ui.Checkbox.prototype.getChecked = function() {
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return this.checked_;
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};
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/**
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* @return {boolean} Whether the checkbox is checked.
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* @override
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*/
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goog.ui.Checkbox.prototype.isChecked = function() {
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return this.checked_ == goog.ui.Checkbox.State.CHECKED;
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};
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/**
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* @return {boolean} Whether the checkbox is not checked.
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*/
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goog.ui.Checkbox.prototype.isUnchecked = function() {
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return this.checked_ == goog.ui.Checkbox.State.UNCHECKED;
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};
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/**
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* @return {boolean} Whether the checkbox is in partially checked state.
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*/
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goog.ui.Checkbox.prototype.isUndetermined = function() {
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return this.checked_ == goog.ui.Checkbox.State.UNDETERMINED;
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};
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/**
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* Sets the checked state of the checkbox.
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* @param {?boolean} checked The checked state to set.
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* @override
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*/
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goog.ui.Checkbox.prototype.setChecked = function(checked) {
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if (checked != this.checked_) {
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this.checked_ = /** @type {goog.ui.Checkbox.State} */ (checked);
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this.getRenderer().setCheckboxState(this.getElement(), this.checked_);
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}
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};
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/**
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* Sets the checked state for the checkbox. Unlike {@link #setChecked},
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* doesn't update the checkbox's DOM. Considered protected; to be called
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* only by renderer code during element decoration.
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* @param {goog.ui.Checkbox.State} checked New checkbox state.
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*/
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goog.ui.Checkbox.prototype.setCheckedInternal = function(checked) {
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this.checked_ = checked;
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};
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/**
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* Binds an HTML element to the checkbox which if clicked toggles the checkbox.
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* Behaves the same way as the 'label' HTML tag. The label element has to be the
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* direct or non-direct ancestor of the checkbox element because it will get the
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* focus when keyboard support is implemented.
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*
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* @param {Element} label The label control to set. If null, only the checkbox
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* reacts to clicks.
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*/
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goog.ui.Checkbox.prototype.setLabel = function(label) {
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if (this.isInDocument()) {
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this.exitDocument();
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this.label_ = label;
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this.enterDocument();
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} else {
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this.label_ = label;
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}
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};
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/**
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* Toggles the checkbox. State transitions:
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* <ul>
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* <li>unchecked -> checked
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* <li>undetermined -> checked
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* <li>checked -> unchecked
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* </ul>
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*/
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goog.ui.Checkbox.prototype.toggle = function() {
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this.setChecked(this.checked_ ? goog.ui.Checkbox.State.UNCHECKED :
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goog.ui.Checkbox.State.CHECKED);
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};
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/** @override */
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goog.ui.Checkbox.prototype.enterDocument = function() {
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goog.base(this, 'enterDocument');
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if (this.isHandleMouseEvents()) {
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var handler = this.getHandler();
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// Listen to the label, if it was set.
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if (this.label_) {
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// Any mouse events that happen to the associated label should have the
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// same effect on the checkbox as if they were happening to the checkbox
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// itself.
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handler.
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listen(this.label_, goog.events.EventType.CLICK,
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this.handleClickOrSpace_).
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listen(this.label_, goog.events.EventType.MOUSEOVER,
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this.handleMouseOver).
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listen(this.label_, goog.events.EventType.MOUSEOUT,
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this.handleMouseOut).
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listen(this.label_, goog.events.EventType.MOUSEDOWN,
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this.handleMouseDown).
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listen(this.label_, goog.events.EventType.MOUSEUP,
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this.handleMouseUp);
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}
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// Checkbox needs to explicitly listen for click event.
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handler.listen(this.getElement(),
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goog.events.EventType.CLICK, this.handleClickOrSpace_);
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}
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// Set aria label.
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if (this.label_) {
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if (!this.label_.id) {
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this.label_.id = this.makeId('lbl');
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}
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var checkboxElement = this.getElement();
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goog.asserts.assert(checkboxElement,
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'The checkbox DOM element cannot be null.');
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goog.a11y.aria.setState(checkboxElement,
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goog.a11y.aria.State.LABELLEDBY,
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this.label_.id);
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}
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};
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/**
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* Fix for tabindex not being updated so that disabled checkbox is not
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* focusable. In particular this fails in Chrome.
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* Note: in general tabIndex=-1 will prevent from keyboard focus but enables
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* mouse focus, however in this case the control class prevents mouse focus.
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* @override
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*/
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goog.ui.Checkbox.prototype.setEnabled = function(enabled) {
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goog.base(this, 'setEnabled', enabled);
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var el = this.getElement();
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if (el) {
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el.tabIndex = this.isEnabled() ? 0 : -1;
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}
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};
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/**
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* Handles the click event.
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* @param {!goog.events.BrowserEvent} e The event.
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* @private
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*/
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goog.ui.Checkbox.prototype.handleClickOrSpace_ = function(e) {
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e.stopPropagation();
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var eventType = this.checked_ ? goog.ui.Component.EventType.UNCHECK :
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goog.ui.Component.EventType.CHECK;
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if (this.isEnabled() && this.dispatchEvent(eventType)) {
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e.preventDefault(); // Prevent scrolling in Chrome if SPACE is pressed.
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this.toggle();
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this.dispatchEvent(goog.ui.Component.EventType.CHANGE);
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}
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};
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/** @override */
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goog.ui.Checkbox.prototype.handleKeyEventInternal = function(e) {
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if (e.keyCode == goog.events.KeyCodes.SPACE) {
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this.handleClickOrSpace_(e);
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}
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return false;
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};
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/**
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* Register this control so it can be created from markup.
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*/
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goog.ui.registry.setDecoratorByClassName(
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goog.ui.CheckboxRenderer.CSS_CLASS,
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function() {
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return new goog.ui.Checkbox();
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});
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