com.google.gwt.aria.client

## Class Roles

- java.lang.Object
- - com.google.gwt.aria.client.Roles

-     public final class Roles
      extends java.lang.Object

  A factory providing each concrete role in the ARIA specification. Each role implements methods that a GWT application can use to modify the appropriate DOM attributes for that role.

  For example, suppose our GWT app has a image button and we want to make it visible in screen readers as a button with some help text. To do this, we add a button role to the image and set the ARIA label property to the help text that the screen reader can use:

          Roles.getButtonRole().set(img.getElement());
          Roles.getButtonRole().setAriaLabelProperty(img.getElement(), "some help text");

  Most ARIA properties have a prefix of "aria-" and only affect screen readers, but there is one exception: the "tabindex" property is the same one used for tab order in regular widgets. For example, to set tabindex to 0 for the button:

         Roles.getButtonRole().setTabindexExtraAttribute(img.getElement(), 0);

  When the button changes state (it's enabled or disabled), we can change the ARIA enabled state to match, like this:

         Roles.getButtonRole().setAriaEnabledState(img.getElement(), isEnabled);

  ARIA distinguishes between properties (which change rarely and could be set in static HTML) and states (which need to be updated in response to user input). This distinction can get a bit blurry when a GWT app updates the DOM dynamically. Generally you should update ARIA attributes at the same time that you change the CSS styles on a DOM node, so that a screen reader will see the same state as someone viewing the page visually.

  The role interfaces form a hierarchy whose root is the `Role` interface, which contains generic methods that aren't specific to a role. Some abstract roles include:

  1. `WidgetRole`, for DOM elements that represent either standalone or composite widgets.
  2. `CompositeRole`, for widgets that contain other widgets.
  3. `StructureRole`, for DOM elements that are part of the page layout.
  4. `LandmarkRole`, for DOM elements defining common regions of a page.
  5. `WindowRole`, for DOM elements that define windows and dialogs.
  See Also:
    the W3C specification

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `Roles()`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `static AlertdialogRole` | `getAlertdialogRole()`
    `static AlertRole` | `getAlertRole()`
    `static ApplicationRole` | `getApplicationRole()`
    `static ArticleRole` | `getArticleRole()`
    `static BannerRole` | `getBannerRole()`
    `static ButtonRole` | `getButtonRole()`
    `static CheckboxRole` | `getCheckboxRole()`
    `static ColumnheaderRole` | `getColumnheaderRole()`
    `static ComboboxRole` | `getComboboxRole()`
    `static ComplementaryRole` | `getComplementaryRole()`
    `static ContentinfoRole` | `getContentinfoRole()`
    `static DefinitionRole` | `getDefinitionRole()`
    `static DialogRole` | `getDialogRole()`
    `static DirectoryRole` | `getDirectoryRole()`
    `static DocumentRole` | `getDocumentRole()`
    `static FormRole` | `getFormRole()`
    `static GridcellRole` | `getGridcellRole()`
    `static GridRole` | `getGridRole()`
    `static GroupRole` | `getGroupRole()`
    `static HeadingRole` | `getHeadingRole()`
    `static ImgRole` | `getImgRole()`
    `static LinkRole` | `getLinkRole()`
    `static ListboxRole` | `getListboxRole()`
    `static ListitemRole` | `getListitemRole()`
    `static ListRole` | `getListRole()`
    `static LogRole` | `getLogRole()`
    `static MainRole` | `getMainRole()`
    `static MarqueeRole` | `getMarqueeRole()`
    `static MathRole` | `getMathRole()`
    `static MenubarRole` | `getMenubarRole()`
    `static MenuitemcheckboxRole` | `getMenuitemcheckboxRole()`
    `static MenuitemradioRole` | `getMenuitemradioRole()`
    `static MenuitemRole` | `getMenuitemRole()`
    `static MenuRole` | `getMenuRole()`
    `static NavigationRole` | `getNavigationRole()`
    `static NoteRole` | `getNoteRole()`
    `static OptionRole` | `getOptionRole()`
    `static PresentationRole` | `getPresentationRole()`
    `static ProgressbarRole` | `getProgressbarRole()`
    `static RadiogroupRole` | `getRadiogroupRole()`
    `static RadioRole` | `getRadioRole()`
    `static RegionRole` | `getRegionRole()`
    `static RowgroupRole` | `getRowgroupRole()`
    `static RowheaderRole` | `getRowheaderRole()`
    `static RowRole` | `getRowRole()`
    `static ScrollbarRole` | `getScrollbarRole()`
    `static SearchRole` | `getSearchRole()`
    `static SeparatorRole` | `getSeparatorRole()`
    `static SliderRole` | `getSliderRole()`
    `static SpinbuttonRole` | `getSpinbuttonRole()`
    `static StatusRole` | `getStatusRole()`
    `static TablistRole` | `getTablistRole()`
    `static TabpanelRole` | `getTabpanelRole()`
    `static TabRole` | `getTabRole()`
    `static TextboxRole` | `getTextboxRole()`
    `static TimerRole` | `getTimerRole()`
    `static ToolbarRole` | `getToolbarRole()`
    `static TooltipRole` | `getTooltipRole()`
    `static TreegridRole` | `getTreegridRole()`
    `static TreeitemRole` | `getTreeitemRole()`
    `static TreeRole` | `getTreeRole()`
    `static Role` | `roleOf(Element element)` Returns the WAI-ARIA role for the `element`.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### Roles

          public Roles()

  - ### Method Detail

    - #### getAlertdialogRole

          public static AlertdialogRole getAlertdialogRole()

    - #### getAlertRole

          public static AlertRole getAlertRole()

    - #### getApplicationRole

          public static ApplicationRole getApplicationRole()

    - #### getArticleRole

          public static ArticleRole getArticleRole()

    - #### getBannerRole

          public static BannerRole getBannerRole()

    - #### getButtonRole

          public static ButtonRole getButtonRole()

    - #### getCheckboxRole

          public static CheckboxRole getCheckboxRole()

    - #### getColumnheaderRole

          public static ColumnheaderRole getColumnheaderRole()

    - #### getComboboxRole

          public static ComboboxRole getComboboxRole()

    - #### getComplementaryRole

          public static ComplementaryRole getComplementaryRole()

    - #### getContentinfoRole

          public static ContentinfoRole getContentinfoRole()

    - #### getDefinitionRole

          public static DefinitionRole getDefinitionRole()

    - #### getDialogRole

          public static DialogRole getDialogRole()

    - #### getDirectoryRole

          public static DirectoryRole getDirectoryRole()

    - #### getDocumentRole

          public static DocumentRole getDocumentRole()

    - #### getFormRole

          public static FormRole getFormRole()

    - #### getGridcellRole

          public static GridcellRole getGridcellRole()

    - #### getGridRole

          public static GridRole getGridRole()

    - #### getGroupRole

          public static GroupRole getGroupRole()

    - #### getHeadingRole

          public static HeadingRole getHeadingRole()

    - #### getImgRole

          public static ImgRole getImgRole()

    - #### getLinkRole

          public static LinkRole getLinkRole()

    - #### getListboxRole

          public static ListboxRole getListboxRole()

    - #### getListitemRole

          public static ListitemRole getListitemRole()

    - #### getListRole

          public static ListRole getListRole()

    - #### getLogRole

          public static LogRole getLogRole()

    - #### getMainRole

          public static MainRole getMainRole()

    - #### getMarqueeRole

          public static MarqueeRole getMarqueeRole()

    - #### getMathRole

          public static MathRole getMathRole()

    - #### getMenubarRole

          public static MenubarRole getMenubarRole()

    - #### getMenuitemcheckboxRole

          public static MenuitemcheckboxRole getMenuitemcheckboxRole()

    - #### getMenuitemradioRole

          public static MenuitemradioRole getMenuitemradioRole()

    - #### getMenuitemRole

          public static MenuitemRole getMenuitemRole()

    - #### getMenuRole

          public static MenuRole getMenuRole()

    - #### getNavigationRole

          public static NavigationRole getNavigationRole()

    - #### getNoteRole

          public static NoteRole getNoteRole()

    - #### getOptionRole

          public static OptionRole getOptionRole()

    - #### getPresentationRole

          public static PresentationRole getPresentationRole()

    - #### getProgressbarRole

          public static ProgressbarRole getProgressbarRole()

    - #### getRadiogroupRole

          public static RadiogroupRole getRadiogroupRole()

    - #### getRadioRole

          public static RadioRole getRadioRole()

    - #### getRegionRole

          public static RegionRole getRegionRole()

    - #### getRowgroupRole

          public static RowgroupRole getRowgroupRole()

    - #### getRowheaderRole

          public static RowheaderRole getRowheaderRole()

    - #### getRowRole

          public static RowRole getRowRole()

    - #### getScrollbarRole

          public static ScrollbarRole getScrollbarRole()

    - #### getSearchRole

          public static SearchRole getSearchRole()

    - #### getSeparatorRole

          public static SeparatorRole getSeparatorRole()

    - #### getSliderRole

          public static SliderRole getSliderRole()

    - #### getSpinbuttonRole

          public static SpinbuttonRole getSpinbuttonRole()

    - #### getStatusRole

          public static StatusRole getStatusRole()

    - #### getTablistRole

          public static TablistRole getTablistRole()

    - #### getTabpanelRole

          public static TabpanelRole getTabpanelRole()

    - #### getTabRole

          public static TabRole getTabRole()

    - #### getTextboxRole

          public static TextboxRole getTextboxRole()

    - #### getTimerRole

          public static TimerRole getTimerRole()

    - #### getToolbarRole

          public static ToolbarRole getToolbarRole()

    - #### getTooltipRole

          public static TooltipRole getTooltipRole()

    - #### getTreegridRole

          public static TreegridRole getTreegridRole()

    - #### getTreeitemRole

          public static TreeitemRole getTreeitemRole()

    - #### getTreeRole

          public static TreeRole getTreeRole()

    - #### roleOf

          public static Role roleOf(Element element)

      Returns the WAI-ARIA role for the `element`. If no 'role' attribute is set to the `element` or if the set role tokens do not include a WAI-ARIA role, null is returned. Otherwise, if a WAI_ARIA role is among the role tokens in the the 'role' attribute token list, a `Role` corresponding the WAI-ARIA role is returned.