Add third_party/google-input-tools: Take 2

third_party/google_input_tools/third_party/closure_library/closure/goog/ui/controlrenderer.js

Index: third_party/google_input_tools/third_party/closure_library/closure/goog/ui/controlrenderer.js
diff --git a/third_party/google_input_tools/third_party/closure_library/closure/goog/ui/controlrenderer.js b/third_party/google_input_tools/third_party/closure_library/closure/goog/ui/controlrenderer.js
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index 0000000000000000000000000000000000000000..e16d1a27fb2a95772dd1a62bd0431ca888f5dd23
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@@ -0,0 +1,927 @@
+// 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 Base class for control renderers.
+ * TODO(attila):  If the renderer framework works well, pull it into Component.
+ *
+ * @author attila@google.com (Attila Bodis)
+ */
+
+goog.provide('goog.ui.ControlRenderer');
+
+goog.require('goog.a11y.aria');
+goog.require('goog.a11y.aria.Role');
+goog.require('goog.a11y.aria.State');
+goog.require('goog.array');
+goog.require('goog.asserts');
+goog.require('goog.dom');
+goog.require('goog.dom.classlist');
+goog.require('goog.object');
+goog.require('goog.string');
+goog.require('goog.style');
+goog.require('goog.ui.Component');
+goog.require('goog.userAgent');
+
+
+
+/**
+ * Default renderer for {@link goog.ui.Control}s.  Can be used as-is, but
+ * subclasses of Control will probably want to use renderers specifically
+ * tailored for them by extending this class.  Controls that use renderers
+ * delegate one or more of the following API methods to the renderer:
+ * <ul>
+ *    <li>{@code createDom} - renders the DOM for the component
+ *    <li>{@code canDecorate} - determines whether an element can be decorated
+ *        by the component
+ *    <li>{@code decorate} - decorates an existing element with the component
+ *    <li>{@code setState} - updates the appearance of the component based on
+ *        its state
+ *    <li>{@code getContent} - returns the component's content
+ *    <li>{@code setContent} - sets the component's content
+ * </ul>
+ * Controls are stateful; renderers, on the other hand, should be stateless and
+ * reusable.
+ * @constructor
+ */
+goog.ui.ControlRenderer = function() {
+};
+goog.addSingletonGetter(goog.ui.ControlRenderer);
+goog.tagUnsealableClass(goog.ui.ControlRenderer);
+
+
+/**
+ * Constructs a new renderer and sets the CSS class that the renderer will use
+ * as the base CSS class to apply to all elements rendered by that renderer.
+ * An example to use this function using a color palette:
+ *
+ * <pre>
+ * var myCustomRenderer = goog.ui.ControlRenderer.getCustomRenderer(
+ *     goog.ui.PaletteRenderer, 'my-special-palette');
+ * var newColorPalette = new goog.ui.ColorPalette(
+ *     colors, myCustomRenderer, opt_domHelper);
+ * </pre>
+ *
+ * Your CSS can look like this now:
+ * <pre>
+ * .my-special-palette { }
+ * .my-special-palette-table { }
+ * .my-special-palette-cell { }
+ * etc.
+ * </pre>
+ *
+ * <em>instead</em> of
+ * <pre>
+ * .CSS_MY_SPECIAL_PALETTE .goog-palette { }
+ * .CSS_MY_SPECIAL_PALETTE .goog-palette-table { }
+ * .CSS_MY_SPECIAL_PALETTE .goog-palette-cell { }
+ * etc.
+ * </pre>
+ *
+ * You would want to use this functionality when you want an instance of a
+ * component to have specific styles different than the other components of the
+ * same type in your application.  This avoids using descendant selectors to
+ * apply the specific styles to this component.
+ *
+ * @param {Function} ctor The constructor of the renderer you are trying to
+ *     create.
+ * @param {string} cssClassName The name of the CSS class for this renderer.
+ * @return {goog.ui.ControlRenderer} An instance of the desired renderer with
+ *     its getCssClass() method overridden to return the supplied custom CSS
+ *     class name.
+ */
+goog.ui.ControlRenderer.getCustomRenderer = function(ctor, cssClassName) {
+  var renderer = new ctor();
+
+  /**
+   * Returns the CSS class to be applied to the root element of components
+   * rendered using this renderer.
+   * @return {string} Renderer-specific CSS class.
+   */
+  renderer.getCssClass = function() {
+    return cssClassName;
+  };
+
+  return renderer;
+};
+
+
+/**
+ * Default CSS class to be applied to the root element of components rendered
+ * by this renderer.
+ * @type {string}
+ */
+goog.ui.ControlRenderer.CSS_CLASS = goog.getCssName('goog-control');
+
+
+/**
+ * Array of arrays of CSS classes that we want composite classes added and
+ * removed for in IE6 and lower as a workaround for lack of multi-class CSS
+ * selector support.
+ *
+ * Subclasses that have accompanying CSS requiring this workaround should define
+ * their own static IE6_CLASS_COMBINATIONS constant and override
+ * getIe6ClassCombinations to return it.
+ *
+ * For example, if your stylesheet uses the selector .button.collapse-left
+ * (and is compiled to .button_collapse-left for the IE6 version of the
+ * stylesheet,) you should include ['button', 'collapse-left'] in this array
+ * and the class button_collapse-left will be applied to the root element
+ * whenever both button and collapse-left are applied individually.
+ *
+ * Members of each class name combination will be joined with underscores in the
+ * order that they're defined in the array. You should alphabetize them (for
+ * compatibility with the CSS compiler) unless you are doing something special.
+ * @type {Array.<Array.<string>>}
+ */
+goog.ui.ControlRenderer.IE6_CLASS_COMBINATIONS = [];
+
+
+/**
+ * Map of component states to corresponding ARIA attributes.  Since the mapping
+ * of component states to ARIA attributes is neither component- nor
+ * renderer-specific, this is a static property of the renderer class, and is
+ * initialized on first use.
+ * @type {Object.<goog.ui.Component.State, goog.a11y.aria.State>}
+ * @private
+ * @const
+ */
+goog.ui.ControlRenderer.ARIA_ATTRIBUTE_MAP_;
+
+
+/**
+ * Map of certain ARIA states to ARIA roles that support them. Used for checked
+ * and selected Component states because they are used on Components with ARIA
+ * roles that do not support the corresponding ARIA state.
+ * @private {!Object.<goog.a11y.aria.Role, goog.a11y.aria.State>}
+ * @const
+ */
+goog.ui.ControlRenderer.TOGGLE_ARIA_STATE_MAP_ = goog.object.create(
+    goog.a11y.aria.Role.BUTTON, goog.a11y.aria.State.PRESSED,
+    goog.a11y.aria.Role.CHECKBOX, goog.a11y.aria.State.CHECKED,
+    goog.a11y.aria.Role.MENU_ITEM, goog.a11y.aria.State.SELECTED,
+    goog.a11y.aria.Role.MENU_ITEM_CHECKBOX, goog.a11y.aria.State.CHECKED,
+    goog.a11y.aria.Role.MENU_ITEM_RADIO, goog.a11y.aria.State.CHECKED,
+    goog.a11y.aria.Role.RADIO, goog.a11y.aria.State.CHECKED,
+    goog.a11y.aria.Role.TAB, goog.a11y.aria.State.SELECTED,
+    goog.a11y.aria.Role.TREEITEM, goog.a11y.aria.State.SELECTED);
+
+
+/**
+ * Returns the ARIA role to be applied to the control.
+ * See http://wiki/Main/ARIA for more info.
+ * @return {goog.a11y.aria.Role|undefined} ARIA role.
+ */
+goog.ui.ControlRenderer.prototype.getAriaRole = function() {
+  // By default, the ARIA role is unspecified.
+  return undefined;
+};
+
+
+/**
+ * Returns the control's contents wrapped in a DIV, with the renderer's own
+ * CSS class and additional state-specific classes applied to it.
+ * @param {goog.ui.Control} control Control to render.
+ * @return {Element} Root element for the control.
+ */
+goog.ui.ControlRenderer.prototype.createDom = function(control) {
+  // Create and return DIV wrapping contents.
+  var element = control.getDomHelper().createDom(
+      'div', this.getClassNames(control).join(' '), control.getContent());
+
+  this.setAriaStates(control, element);
+  return element;
+};
+
+
+/**
+ * Takes the control's root element and returns the parent element of the
+ * control's contents.  Since by default controls are rendered as a single
+ * DIV, the default implementation returns the element itself.  Subclasses
+ * with more complex DOM structures must override this method as needed.
+ * @param {Element} element Root element of the control whose content element
+ *     is to be returned.
+ * @return {Element} The control's content element.
+ */
+goog.ui.ControlRenderer.prototype.getContentElement = function(element) {
+  return element;
+};
+
+
+/**
+ * Updates the control's DOM by adding or removing the specified class name
+ * to/from its root element. May add additional combined classes as needed in
+ * IE6 and lower. Because of this, subclasses should use this method when
+ * modifying class names on the control's root element.
+ * @param {goog.ui.Control|Element} control Control instance (or root element)
+ *     to be updated.
+ * @param {string} className CSS class name to add or remove.
+ * @param {boolean} enable Whether to add or remove the class name.
+ */
+goog.ui.ControlRenderer.prototype.enableClassName = function(control,
+    className, enable) {
+  var element = /** @type {Element} */ (
+      control.getElement ? control.getElement() : control);
+  if (element) {
+    var classNames = [className];
+
+    // For IE6, we need to enable any combined classes involving this class
+    // as well.
+    // TODO(user): Remove this as IE6 is no longer in use.
+    if (goog.userAgent.IE && !goog.userAgent.isVersionOrHigher('7')) {
+      classNames = this.getAppliedCombinedClassNames_(
+          goog.dom.classlist.get(element), className);
+      classNames.push(className);
+    }
+
+    goog.dom.classlist.enableAll(element, classNames, enable);
+  }
+};
+
+
+/**
+ * Updates the control's DOM by adding or removing the specified extra class
+ * name to/from its element.
+ * @param {goog.ui.Control} control Control to be updated.
+ * @param {string} className CSS class name to add or remove.
+ * @param {boolean} enable Whether to add or remove the class name.
+ */
+goog.ui.ControlRenderer.prototype.enableExtraClassName = function(control,
+    className, enable) {
+  // The base class implementation is trivial; subclasses should override as
+  // needed.
+  this.enableClassName(control, className, enable);
+};
+
+
+/**
+ * Returns true if this renderer can decorate the element, false otherwise.
+ * The default implementation always returns true.
+ * @param {Element} element Element to decorate.
+ * @return {boolean} Whether the renderer can decorate the element.
+ */
+goog.ui.ControlRenderer.prototype.canDecorate = function(element) {
+  return true;
+};
+
+
+/**
+ * Default implementation of {@code decorate} for {@link goog.ui.Control}s.
+ * Initializes the control's ID, content, and state based on the ID of the
+ * element, its child nodes, and its CSS classes, respectively.  Returns the
+ * element.
+ * @param {goog.ui.Control} control Control instance to decorate the element.
+ * @param {Element} element Element to decorate.
+ * @return {Element} Decorated element.
+ */
+goog.ui.ControlRenderer.prototype.decorate = function(control, element) {
+  // Set the control's ID to the decorated element's DOM ID, if any.
+  if (element.id) {
+    control.setId(element.id);
+  }
+
+  // Set the control's content to the decorated element's content.
+  var contentElem = this.getContentElement(element);
+  if (contentElem && contentElem.firstChild) {
+    control.setContentInternal(contentElem.firstChild.nextSibling ?
+        goog.array.clone(contentElem.childNodes) : contentElem.firstChild);
+  } else {
+    control.setContentInternal(null);
+  }
+
+  // Initialize the control's state based on the decorated element's CSS class.
+  // This implementation is optimized to minimize object allocations, string
+  // comparisons, and DOM access.
+  var state = 0x00;
+  var rendererClassName = this.getCssClass();
+  var structuralClassName = this.getStructuralCssClass();
+  var hasRendererClassName = false;
+  var hasStructuralClassName = false;
+  var hasCombinedClassName = false;
+  var classNames = goog.array.toArray(goog.dom.classlist.get(element));
+  goog.array.forEach(classNames, function(className) {
+    if (!hasRendererClassName && className == rendererClassName) {
+      hasRendererClassName = true;
+      if (structuralClassName == rendererClassName) {
+        hasStructuralClassName = true;
+      }
+    } else if (!hasStructuralClassName && className == structuralClassName) {
+      hasStructuralClassName = true;
+    } else {
+      state |= this.getStateFromClass(className);
+    }
+  }, this);
+  control.setStateInternal(state);
+
+  // Make sure the element has the renderer's CSS classes applied, as well as
+  // any extra class names set on the control.
+  if (!hasRendererClassName) {
+    classNames.push(rendererClassName);
+    if (structuralClassName == rendererClassName) {
+      hasStructuralClassName = true;
+    }
+  }
+  if (!hasStructuralClassName) {
+    classNames.push(structuralClassName);
+  }
+  var extraClassNames = control.getExtraClassNames();
+  if (extraClassNames) {
+    classNames.push.apply(classNames, extraClassNames);
+  }
+
+  // For IE6, rewrite all classes on the decorated element if any combined
+  // classes apply.
+  if (goog.userAgent.IE && !goog.userAgent.isVersionOrHigher('7')) {
+    var combinedClasses = this.getAppliedCombinedClassNames_(
+        classNames);
+    if (combinedClasses.length > 0) {
+      classNames.push.apply(classNames, combinedClasses);
+      hasCombinedClassName = true;
+    }
+  }
+
+  // Only write to the DOM if new class names had to be added to the element.
+  if (!hasRendererClassName || !hasStructuralClassName ||
+      extraClassNames || hasCombinedClassName) {
+    goog.dom.classlist.set(element, classNames.join(' '));
+  }
+
+  this.setAriaStates(control, element);
+  return element;
+};
+
+
+/**
+ * Initializes the control's DOM by configuring properties that can only be set
+ * after the DOM has entered the document.  This implementation sets up BiDi
+ * and keyboard focus.  Called from {@link goog.ui.Control#enterDocument}.
+ * @param {goog.ui.Control} control Control whose DOM is to be initialized
+ *     as it enters the document.
+ */
+goog.ui.ControlRenderer.prototype.initializeDom = function(control) {
+  // Initialize render direction (BiDi).  We optimize the left-to-right render
+  // direction by assuming that elements are left-to-right by default, and only
+  // updating their styling if they are explicitly set to right-to-left.
+  if (control.isRightToLeft()) {
+    this.setRightToLeft(control.getElement(), true);
+  }
+
+  // Initialize keyboard focusability (tab index).  We assume that components
+  // aren't focusable by default (i.e have no tab index), and only touch the
+  // DOM if the component is focusable, enabled, and visible, and therefore
+  // needs a tab index.
+  if (control.isEnabled()) {
+    this.setFocusable(control, control.isVisible());
+  }
+};
+
+
+/**
+ * Sets the element's ARIA role.
+ * @param {Element} element Element to update.
+ * @param {?goog.a11y.aria.Role=} opt_preferredRole The preferred ARIA role.
+ */
+goog.ui.ControlRenderer.prototype.setAriaRole = function(element,
+    opt_preferredRole) {
+  var ariaRole = opt_preferredRole || this.getAriaRole();
+  if (ariaRole) {
+    goog.asserts.assert(element,
+        'The element passed as a first parameter cannot be null.');
+    var currentRole = goog.a11y.aria.getRole(element);
+    if (ariaRole == currentRole) {
+      return;
+    }
+    goog.a11y.aria.setRole(element, ariaRole);
+  }
+};
+
+
+/**
+ * Sets the element's ARIA attributes, including distinguishing between
+ * universally supported ARIA properties and ARIA states that are only
+ * supported by certain ARIA roles. Only attributes which are initialized to be
+ * true will be set.
+ * @param {!goog.ui.Control} control Control whose ARIA state will be updated.
+ * @param {!Element} element Element whose ARIA state is to be updated.
+ */
+goog.ui.ControlRenderer.prototype.setAriaStates = function(control, element) {
+  goog.asserts.assert(control);
+  goog.asserts.assert(element);
+
+  if (!control.isVisible()) {
+    goog.a11y.aria.setState(
+        element, goog.a11y.aria.State.HIDDEN, !control.isVisible());
+  }
+  if (!control.isEnabled()) {
+    this.updateAriaState(
+        element, goog.ui.Component.State.DISABLED, !control.isEnabled());
+  }
+  if (control.isSupportedState(goog.ui.Component.State.SELECTED)) {
+    this.updateAriaState(
+        element, goog.ui.Component.State.SELECTED, control.isSelected());
+  }
+  if (control.isSupportedState(goog.ui.Component.State.CHECKED)) {
+    this.updateAriaState(
+        element, goog.ui.Component.State.CHECKED, control.isChecked());
+  }
+  if (control.isSupportedState(goog.ui.Component.State.OPENED)) {
+    this.updateAriaState(
+        element, goog.ui.Component.State.OPENED, control.isOpen());
+  }
+};
+
+
+/**
+ * Allows or disallows text selection within the control's DOM.
+ * @param {Element} element The control's root element.
+ * @param {boolean} allow Whether the element should allow text selection.
+ */
+goog.ui.ControlRenderer.prototype.setAllowTextSelection = function(element,
+    allow) {
+  // On all browsers other than IE and Opera, it isn't necessary to recursively
+  // apply unselectable styling to the element's children.
+  goog.style.setUnselectable(element, !allow,
+      !goog.userAgent.IE && !goog.userAgent.OPERA);
+};
+
+
+/**
+ * Applies special styling to/from the control's element if it is rendered
+ * right-to-left, and removes it if it is rendered left-to-right.
+ * @param {Element} element The control's root element.
+ * @param {boolean} rightToLeft Whether the component is rendered
+ *     right-to-left.
+ */
+goog.ui.ControlRenderer.prototype.setRightToLeft = function(element,
+    rightToLeft) {
+  this.enableClassName(element,
+      goog.getCssName(this.getStructuralCssClass(), 'rtl'), rightToLeft);
+};
+
+
+/**
+ * Returns true if the control's key event target supports keyboard focus
+ * (based on its {@code tabIndex} attribute), false otherwise.
+ * @param {goog.ui.Control} control Control whose key event target is to be
+ *     checked.
+ * @return {boolean} Whether the control's key event target is focusable.
+ */
+goog.ui.ControlRenderer.prototype.isFocusable = function(control) {
+  var keyTarget;
+  if (control.isSupportedState(goog.ui.Component.State.FOCUSED) &&
+      (keyTarget = control.getKeyEventTarget())) {
+    return goog.dom.isFocusableTabIndex(keyTarget);
+  }
+  return false;
+};
+
+
+/**
+ * Updates the control's key event target to make it focusable or non-focusable
+ * via its {@code tabIndex} attribute.  Does nothing if the control doesn't
+ * support the {@code FOCUSED} state, or if it has no key event target.
+ * @param {goog.ui.Control} control Control whose key event target is to be
+ *     updated.
+ * @param {boolean} focusable Whether to enable keyboard focus support on the
+ *     control's key event target.
+ */
+goog.ui.ControlRenderer.prototype.setFocusable = function(control, focusable) {
+  var keyTarget;
+  if (control.isSupportedState(goog.ui.Component.State.FOCUSED) &&
+      (keyTarget = control.getKeyEventTarget())) {
+    if (!focusable && control.isFocused()) {
+      // Blur before hiding.  Note that IE calls onblur handlers asynchronously.
+      try {
+        keyTarget.blur();
+      } catch (e) {
+        // TODO(user|user):  Find out why this fails on IE.
+      }
+      // The blur event dispatched by the key event target element when blur()
+      // was called on it should have been handled by the control's handleBlur()
+      // method, so at this point the control should no longer be focused.
+      // However, blur events are unreliable on IE and FF3, so if at this point
+      // the control is still focused, we trigger its handleBlur() method
+      // programmatically.
+      if (control.isFocused()) {
+        control.handleBlur(null);
+      }
+    }
+    // Don't overwrite existing tab index values unless needed.
+    if (goog.dom.isFocusableTabIndex(keyTarget) != focusable) {
+      goog.dom.setFocusableTabIndex(keyTarget, focusable);
+    }
+  }
+};
+
+
+/**
+ * Shows or hides the element.
+ * @param {Element} element Element to update.
+ * @param {boolean} visible Whether to show the element.
+ */
+goog.ui.ControlRenderer.prototype.setVisible = function(element, visible) {
+  // The base class implementation is trivial; subclasses should override as
+  // needed.  It should be possible to do animated reveals, for example.
+  goog.style.setElementShown(element, visible);
+  if (element) {
+    goog.a11y.aria.setState(element, goog.a11y.aria.State.HIDDEN, !visible);
+  }
+};
+
+
+/**
+ * Updates the appearance of the control in response to a state change.
+ * @param {goog.ui.Control} control Control instance to update.
+ * @param {goog.ui.Component.State} state State to enable or disable.
+ * @param {boolean} enable Whether the control is entering or exiting the state.
+ */
+goog.ui.ControlRenderer.prototype.setState = function(control, state, enable) {
+  var element = control.getElement();
+  if (element) {
+    var className = this.getClassForState(state);
+    if (className) {
+      this.enableClassName(control, className, enable);
+    }
+    this.updateAriaState(element, state, enable);
+  }
+};
+
+
+/**
+ * Updates the element's ARIA (accessibility) attributes , including
+ * distinguishing between universally supported ARIA properties and ARIA states
+ * that are only supported by certain ARIA roles.
+ * @param {Element} element Element whose ARIA state is to be updated.
+ * @param {goog.ui.Component.State} state Component state being enabled or
+ *     disabled.
+ * @param {boolean} enable Whether the state is being enabled or disabled.
+ * @protected
+ */
+goog.ui.ControlRenderer.prototype.updateAriaState = function(element, state,
+    enable) {
+  // Ensure the ARIA attribute map exists.
+  if (!goog.ui.ControlRenderer.ARIA_ATTRIBUTE_MAP_) {
+    goog.ui.ControlRenderer.ARIA_ATTRIBUTE_MAP_ = goog.object.create(
+        goog.ui.Component.State.DISABLED, goog.a11y.aria.State.DISABLED,
+        goog.ui.Component.State.SELECTED, goog.a11y.aria.State.SELECTED,
+        goog.ui.Component.State.CHECKED, goog.a11y.aria.State.CHECKED,
+        goog.ui.Component.State.OPENED, goog.a11y.aria.State.EXPANDED);
+  }
+  goog.asserts.assert(element,
+      'The element passed as a first parameter cannot be null.');
+  var ariaAttr = goog.ui.ControlRenderer.getAriaStateForAriaRole_(
+      element, goog.ui.ControlRenderer.ARIA_ATTRIBUTE_MAP_[state]);
+  if (ariaAttr) {
+    goog.a11y.aria.setState(element, ariaAttr, enable);
+  }
+};
+
+
+/**
+ * Returns the appropriate ARIA attribute based on ARIA role if the ARIA
+ * attribute is an ARIA state.
+ * @param {!Element} element The element from which to get the ARIA role for
+ * matching ARIA state.
+ * @param {goog.a11y.aria.State} attr The ARIA attribute to check to see if it
+ * can be applied to the given ARIA role.
+ * @return {goog.a11y.aria.State} An ARIA attribute that can be applied to the
+ * given ARIA role.
+ * @private
+ */
+goog.ui.ControlRenderer.getAriaStateForAriaRole_ = function(element, attr) {
+  var role = goog.a11y.aria.getRole(element);
+  if (!role) {
+    return attr;
+  }
+  role = /** @type {goog.a11y.aria.Role} */ (role);
+  var matchAttr = goog.ui.ControlRenderer.TOGGLE_ARIA_STATE_MAP_[role] || attr;
+  return goog.ui.ControlRenderer.isAriaState_(attr) ? matchAttr : attr;
+};
+
+
+/**
+ * Determines if the given ARIA attribute is an ARIA property or ARIA state.
+ * @param {goog.a11y.aria.State} attr The ARIA attribute to classify.
+ * @return {boolean} If the ARIA attribute is an ARIA state.
+ * @private
+ */
+goog.ui.ControlRenderer.isAriaState_ = function(attr) {
+  return attr == goog.a11y.aria.State.CHECKED ||
+      attr == goog.a11y.aria.State.SELECTED;
+};
+
+
+/**
+ * Takes a control's root element, and sets its content to the given text
+ * caption or DOM structure.  The default implementation replaces the children
+ * of the given element.  Renderers that create more complex DOM structures
+ * must override this method accordingly.
+ * @param {Element} element The control's root element.
+ * @param {goog.ui.ControlContent} content Text caption or DOM structure to be
+ *     set as the control's content. The DOM nodes will not be cloned, they
+ *     will only moved under the content element of the control.
+ */
+goog.ui.ControlRenderer.prototype.setContent = function(element, content) {
+  var contentElem = this.getContentElement(element);
+  if (contentElem) {
+    goog.dom.removeChildren(contentElem);
+    if (content) {
+      if (goog.isString(content)) {
+        goog.dom.setTextContent(contentElem, content);
+      } else {
+        var childHandler = function(child) {
+          if (child) {
+            var doc = goog.dom.getOwnerDocument(contentElem);
+            contentElem.appendChild(goog.isString(child) ?
+                doc.createTextNode(child) : child);
+          }
+        };
+        if (goog.isArray(content)) {
+          // Array of nodes.
+          goog.array.forEach(content, childHandler);
+        } else if (goog.isArrayLike(content) && !('nodeType' in content)) {
+          // NodeList. The second condition filters out TextNode which also has
+          // length attribute but is not array like. The nodes have to be cloned
+          // because childHandler removes them from the list during iteration.
+          goog.array.forEach(goog.array.clone(/** @type {NodeList} */(content)),
+              childHandler);
+        } else {
+          // Node or string.
+          childHandler(content);
+        }
+      }
+    }
+  }
+};
+
+
+/**
+ * Returns the element within the component's DOM that should receive keyboard
+ * focus (null if none).  The default implementation returns the control's root
+ * element.
+ * @param {goog.ui.Control} control Control whose key event target is to be
+ *     returned.
+ * @return {Element} The key event target.
+ */
+goog.ui.ControlRenderer.prototype.getKeyEventTarget = function(control) {
+  return control.getElement();
+};
+
+
+// CSS class name management.
+
+
+/**
+ * Returns the CSS class name to be applied to the root element of all
+ * components rendered or decorated using this renderer.  The class name
+ * is expected to uniquely identify the renderer class, i.e. no two
+ * renderer classes are expected to share the same CSS class name.
+ * @return {string} Renderer-specific CSS class name.
+ */
+goog.ui.ControlRenderer.prototype.getCssClass = function() {
+  return goog.ui.ControlRenderer.CSS_CLASS;
+};
+
+
+/**
+ * Returns an array of combinations of classes to apply combined class names for
+ * in IE6 and below. See {@link IE6_CLASS_COMBINATIONS} for more detail. This
+ * method doesn't reference {@link IE6_CLASS_COMBINATIONS} so that it can be
+ * compiled out, but subclasses should return their IE6_CLASS_COMBINATIONS
+ * static constant instead.
+ * @return {Array.<Array.<string>>} Array of class name combinations.
+ */
+goog.ui.ControlRenderer.prototype.getIe6ClassCombinations = function() {
+  return [];
+};
+
+
+/**
+ * Returns the name of a DOM structure-specific CSS class to be applied to the
+ * root element of all components rendered or decorated using this renderer.
+ * Unlike the class name returned by {@link #getCssClass}, the structural class
+ * name may be shared among different renderers that generate similar DOM
+ * structures.  The structural class name also serves as the basis of derived
+ * class names used to identify and style structural elements of the control's
+ * DOM, as well as the basis for state-specific class names.  The default
+ * implementation returns the same class name as {@link #getCssClass}, but
+ * subclasses are expected to override this method as needed.
+ * @return {string} DOM structure-specific CSS class name (same as the renderer-
+ *     specific CSS class name by default).
+ */
+goog.ui.ControlRenderer.prototype.getStructuralCssClass = function() {
+  return this.getCssClass();
+};
+
+
+/**
+ * Returns all CSS class names applicable to the given control, based on its
+ * state.  The return value is an array of strings containing
+ * <ol>
+ *   <li>the renderer-specific CSS class returned by {@link #getCssClass},
+ *       followed by
+ *   <li>the structural CSS class returned by {@link getStructuralCssClass} (if
+ *       different from the renderer-specific CSS class), followed by
+ *   <li>any state-specific classes returned by {@link #getClassNamesForState},
+ *       followed by
+ *   <li>any extra classes returned by the control's {@code getExtraClassNames}
+ *       method and
+ *   <li>for IE6 and lower, additional combined classes from
+ *       {@link getAppliedCombinedClassNames_}.
+ * </ol>
+ * Since all controls have at least one renderer-specific CSS class name, this
+ * method is guaranteed to return an array of at least one element.
+ * @param {goog.ui.Control} control Control whose CSS classes are to be
+ *     returned.
+ * @return {!Array.<string>} Array of CSS class names applicable to the control.
+ * @protected
+ */
+goog.ui.ControlRenderer.prototype.getClassNames = function(control) {
+  var cssClass = this.getCssClass();
+
+  // Start with the renderer-specific class name.
+  var classNames = [cssClass];
+
+  // Add structural class name, if different.
+  var structuralCssClass = this.getStructuralCssClass();
+  if (structuralCssClass != cssClass) {
+    classNames.push(structuralCssClass);
+  }
+
+  // Add state-specific class names, if any.
+  var classNamesForState = this.getClassNamesForState(control.getState());
+  classNames.push.apply(classNames, classNamesForState);
+
+  // Add extra class names, if any.
+  var extraClassNames = control.getExtraClassNames();
+  if (extraClassNames) {
+    classNames.push.apply(classNames, extraClassNames);
+  }
+
+  // Add composite classes for IE6 support
+  if (goog.userAgent.IE && !goog.userAgent.isVersionOrHigher('7')) {
+    classNames.push.apply(classNames,
+        this.getAppliedCombinedClassNames_(classNames));
+  }
+
+  return classNames;
+};
+
+
+/**
+ * Returns an array of all the combined class names that should be applied based
+ * on the given list of classes. Checks the result of
+ * {@link getIe6ClassCombinations} for any combinations that have all
+ * members contained in classes. If a combination matches, the members are
+ * joined with an underscore (in order), and added to the return array.
+ *
+ * If opt_includedClass is provided, return only the combined classes that have
+ * all members contained in classes AND include opt_includedClass as well.
+ * opt_includedClass is added to classes as well.
+ * @param {goog.array.ArrayLike.<string>} classes Array-like thing of classes to
+ *     return matching combined classes for.
+ * @param {?string=} opt_includedClass If provided, get only the combined
+ *     classes that include this one.
+ * @return {!Array.<string>} Array of combined class names that should be
+ *     applied.
+ * @private
+ */
+goog.ui.ControlRenderer.prototype.getAppliedCombinedClassNames_ = function(
+    classes, opt_includedClass) {
+  var toAdd = [];
+  if (opt_includedClass) {
+    classes = classes.concat([opt_includedClass]);
+  }
+  goog.array.forEach(this.getIe6ClassCombinations(), function(combo) {
+    if (goog.array.every(combo, goog.partial(goog.array.contains, classes)) &&
+        (!opt_includedClass || goog.array.contains(combo, opt_includedClass))) {
+      toAdd.push(combo.join('_'));
+    }
+  });
+  return toAdd;
+};
+
+
+/**
+ * Takes a bit mask of {@link goog.ui.Component.State}s, and returns an array
+ * of the appropriate class names representing the given state, suitable to be
+ * applied to the root element of a component rendered using this renderer, or
+ * null if no state-specific classes need to be applied.  This default
+ * implementation uses the renderer's {@link getClassForState} method to
+ * generate each state-specific class.
+ * @param {number} state Bit mask of component states.
+ * @return {!Array.<string>} Array of CSS class names representing the given
+ *     state.
+ * @protected
+ */
+goog.ui.ControlRenderer.prototype.getClassNamesForState = function(state) {
+  var classNames = [];
+  while (state) {
+    // For each enabled state, push the corresponding CSS class name onto
+    // the classNames array.
+    var mask = state & -state;  // Least significant bit
+    classNames.push(this.getClassForState(
+        /** @type {goog.ui.Component.State} */ (mask)));
+    state &= ~mask;
+  }
+  return classNames;
+};
+
+
+/**
+ * Takes a single {@link goog.ui.Component.State}, and returns the
+ * corresponding CSS class name (null if none).
+ * @param {goog.ui.Component.State} state Component state.
+ * @return {string|undefined} CSS class representing the given state (undefined
+ *     if none).
+ * @protected
+ */
+goog.ui.ControlRenderer.prototype.getClassForState = function(state) {
+  if (!this.classByState_) {
+    this.createClassByStateMap_();
+  }
+  return this.classByState_[state];
+};
+
+
+/**
+ * Takes a single CSS class name which may represent a component state, and
+ * returns the corresponding component state (0x00 if none).
+ * @param {string} className CSS class name, possibly representing a component
+ *     state.
+ * @return {goog.ui.Component.State} state Component state corresponding
+ *     to the given CSS class (0x00 if none).
+ * @protected
+ */
+goog.ui.ControlRenderer.prototype.getStateFromClass = function(className) {
+  if (!this.stateByClass_) {
+    this.createStateByClassMap_();
+  }
+  var state = parseInt(this.stateByClass_[className], 10);
+  return /** @type {goog.ui.Component.State} */ (isNaN(state) ? 0x00 : state);
+};
+
+
+/**
+ * Creates the lookup table of states to classes, used during state changes.
+ * @private
+ */
+goog.ui.ControlRenderer.prototype.createClassByStateMap_ = function() {
+  var baseClass = this.getStructuralCssClass();
+
+  // This ensures space-separated css classnames are not allowed, which some
+  // ControlRenderers had been doing.  See http://b/13694665.
+  var isValidClassName = !goog.string.contains(
+      goog.string.normalizeWhitespace(baseClass), ' ');
+  goog.asserts.assert(isValidClassName,
+      'ControlRenderer has an invalid css class: \'' + baseClass + '\'');
+
+  /**
+   * Map of component states to state-specific structural class names,
+   * used when changing the DOM in response to a state change.  Precomputed
+   * and cached on first use to minimize object allocations and string
+   * concatenation.
+   * @type {Object}
+   * @private
+   */
+  this.classByState_ = goog.object.create(
+      goog.ui.Component.State.DISABLED, goog.getCssName(baseClass, 'disabled'),
+      goog.ui.Component.State.HOVER, goog.getCssName(baseClass, 'hover'),
+      goog.ui.Component.State.ACTIVE, goog.getCssName(baseClass, 'active'),
+      goog.ui.Component.State.SELECTED, goog.getCssName(baseClass, 'selected'),
+      goog.ui.Component.State.CHECKED, goog.getCssName(baseClass, 'checked'),
+      goog.ui.Component.State.FOCUSED, goog.getCssName(baseClass, 'focused'),
+      goog.ui.Component.State.OPENED, goog.getCssName(baseClass, 'open'));
+};
+
+
+/**
+ * Creates the lookup table of classes to states, used during decoration.
+ * @private
+ */
+goog.ui.ControlRenderer.prototype.createStateByClassMap_ = function() {
+  // We need the classByState_ map so we can transpose it.
+  if (!this.classByState_) {
+    this.createClassByStateMap_();
+  }
+
+  /**
+   * Map of state-specific structural class names to component states,
+   * used during element decoration.  Precomputed and cached on first use
+   * to minimize object allocations and string concatenation.
+   * @type {Object}
+   * @private
+   */
+  this.stateByClass_ = goog.object.transpose(this.classByState_);
+};