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- // Copyright (c) 2011 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
-
- cr.define('cr.ui', function() {
-
- /**
- * Returns the TabBox for a Tab or a TabPanel.
- * @param {Tab|TabPanel} el The tab or tabpanel element.
- * @return {TabBox} The tab box if found.
- */
- function getTabBox(el) {
- return findAncestor(el, function(node) {
- return node.tagName == 'TABBOX';
- });
- }
-
- /**
- * Returns whether an element is a tab related object.
- * @param {HTMLElement} el The element whose tag is being checked
- * @return {boolean} Whether the element is a tab related element.
- */
- function isTabElement(el) {
- return el.tagName == 'TAB' || el.tagName == 'TABPANEL';
- }
-
- /**
- * Set hook for the selected property for Tab and TabPanel.
- * This sets the selectedIndex on the parent TabBox.
- * @param {boolean} newValue The new selected value
- * @param {boolean} oldValue The old selected value. (This is ignored atm.)
- * @this {Tab|TabPanel}
- */
- function selectedSetHook(newValue, oldValue) {
- var tabBox;
- if (newValue && (tabBox = getTabBox(this)))
- tabBox.selectedIndex = Array.prototype.indexOf.call(p.children, this);
- }
-
- /**
- * Decorates all the children of an element.
- * @this {HTMLElement}
- */
- function decorateChildren() {
- var map = {
- TABBOX: TabBox,
- TABS: Tabs,
- TAB: Tab,
- TABPANELS: TabPanels,
- TABPANEL: TabPanel
- };
-
- Object.keys(map).forEach(function(tagName) {
- var children = this.getElementsByTagName(tagName);
- var constr = map[tagName];
- for (var i = 0; child = children[i]; i++) {
- cr.ui.decorate(child, constr);
- }
- }.bind(this));
- }
-
- /**
- * Set hook for TabBox selectedIndex.
- * @param {number} selectedIndex The new selected index.
- * @this {TabBox}
- */
- function selectedIndexSetHook(selectedIndex) {
- var child, tabChild, element;
- element = this.querySelector('tabs');
- if (element) {
- for (var i = 0; child = element.children[i]; i++) {
- child.selected = i == selectedIndex;
- }
- }
-
- element = this.querySelector('tabpanels');
- if (element) {
- for (var i = 0; child = element.children[i]; i++) {
- child.selected = i == selectedIndex;
- }
- }
- }
-
- /**
- * Creates a new tabbox element.
- * @param {Object=} opt_propertyBag Optional properties.
- * @constructor
- * @extends {HTMLElement}
- */
- var TabBox = cr.ui.define('tabbox');
-
- TabBox.prototype = {
- __proto__: HTMLElement.prototype,
- decorate: function() {
- decorateChildren.call(this);
- this.addEventListener('selectedChange', this.handleSelectedChange_, true);
- this.selectedIndex = 0;
- },
-
- /**
- * Callback for when a Tab or TabPanel changes its selected property.
- * @param {Event} e The property change event.
- * @private
- */
- handleSelectedChange_: function(e) {
- var target = e.target;
- if (e.newValue && isTabElement(target) && getTabBox(target) == this) {
- var index = Array.prototype.indexOf.call(target.parentElement.children,
- target);
- this.selectedIndex = index;
- }
- },
-
- selectedIndex_: -1
- };
-
- /**
- * The index of the selected tab or -1 if no tab is selected.
- * @type {number}
- */
- cr.defineProperty(TabBox, 'selectedIndex', cr.PropertyKind.JS_PROP,
- selectedIndexSetHook);
-
- /**
- * Creates a new tabs element.
- * @param {string} opt_label The text label for the item.
- * @constructor
- * @extends {HTMLElement}
- */
- var Tabs = cr.ui.define('tabs');
- Tabs.prototype = {
- __proto__: HTMLElement.prototype,
- decorate: function() {
- decorateChildren.call(this);
-
- // Make the Tabs element focusable.
- this.tabIndex = 0;
- this.addEventListener('keydown', this.handleKeyDown_.bind(this));
-
- // Get (and initializes a focus outline manager.
- this.focusOutlineManager_ =
- cr.ui.FocusOutlineManager.forDocument(this.ownerDocument);
- },
-
- /**
- * Handle keydown to change the selected tab when the user presses the
- * arrow keys.
- * @param {Event} e The keyboard event.
- * @private
- */
- handleKeyDown_: function(e) {
- var delta = 0;
- switch (e.keyIdentifier) {
- case 'Left':
- case 'Up':
- delta = -1;
- break;
- case 'Right':
- case 'Down':
- delta = 1;
- break;
- }
-
- if (!delta)
- return;
-
- var cs = this.ownerDocument.defaultView.getComputedStyle(this);
- if (cs.direction == 'rtl')
- delta *= -1;
-
- var count = this.children.length;
- var tabbox = getTabBox(this);
- var index = tabbox.selectedIndex;
- tabbox.selectedIndex = (index + delta + count) % count;
-
- // Show focus outline since we used the keyboard.
- this.focusOutlineManager_.visible = true;
- }
- };
-
- /**
- * Creates a new tab element.
- * @param {string} opt_label The text label for the item.
- * @constructor
- * @extends {HTMLElement}
- */
- var Tab = cr.ui.define('tab');
- Tab.prototype = {
- __proto__: HTMLElement.prototype,
- decorate: function() {
- var self = this;
- this.addEventListener(cr.isMac ? 'click' : 'mousedown', function() {
- self.selected = true;
- });
- }
- };
-
- /**
- * Whether the tab is selected.
- * @type {boolean}
- */
- cr.defineProperty(Tab, 'selected', cr.PropertyKind.BOOL_ATTR);
-
- /**
- * Creates a new tabpanels element.
- * @param {string} opt_label The text label for the item.
- * @constructor
- * @extends {HTMLElement}
- */
- var TabPanels = cr.ui.define('tabpanels');
- TabPanels.prototype = {
- __proto__: HTMLElement.prototype,
- decorate: decorateChildren
- };
-
- /**
- * Creates a new tabpanel element.
- * @param {string} opt_label The text label for the item.
- * @constructor
- * @extends {HTMLElement}
- */
- var TabPanel = cr.ui.define('tabpanel');
- TabPanel.prototype = {
- __proto__: HTMLElement.prototype,
- decorate: function() {}
- };
-
- /**
- * Whether the tab is selected.
- * @type {boolean}
- */
- cr.defineProperty(TabPanel, 'selected', cr.PropertyKind.BOOL_ATTR);
-
- return {
- TabBox: TabBox,
- Tabs: Tabs,
- Tab: Tab,
- TabPanels: TabPanels,
- TabPanel: TabPanel
- };
- });
-