Method Details

• collectBeforeEnterObservers

  public static List<BeforeEnterObserver> collectBeforeEnterObservers(Collection<? extends HasElement> oldChain, Collection<? extends HasElement> newChain)

  Collect before enter observer instances based on what will be attached when a new view chain is applied. Because components in the new chain might still have children that will yet be detached, the old chain is also needed in order to exclude anything that is only in the old chain but missing from the new chain.

  Parameters:

  oldChain - the view chain prior to the navigation

  newChain - the view chain after the navigation

  Returns:

  list of found BeforeEnterObservers

• collectBeforeEnterObserversFromChain

  public static List<BeforeEnterObserver> collectBeforeEnterObserversFromChain(Collection<? extends HasElement> chain, Collection<? extends HasElement> childrenExclusions)

  Collect before enter observer instances based on what will be attached when a new view chain is applied.

  Parameters:

  chain - the view chain after the navigation

  childrenExclusions - any children of any element in the chain input that is found in this collection will be excluded from the result

  Returns:

  list of found BeforeEnterObservers in the chain tree.

• collectBeforeEnterObserversFromChainElement

  public static List<BeforeEnterObserver> collectBeforeEnterObserversFromChainElement(HasElement element, Collection<? extends HasElement> childrenExclusions)

  Collect before enter observer instances in the element's hierarchy.

  Parameters:

  element - an element

  childrenExclusions - any children of the element input that is found in this collection will be excluded from the result

  Returns:

  list of found BeforeEnterObservers in the element hierarchy tree.

• collectBeforeLeaveObservers

  public static List<BeforeLeaveObserver> collectBeforeLeaveObservers(UI ui)

  Collect all Components implementing BeforeLeaveObserver connected to the given UI.

  Parameters:

  ui - UI to search from

  Returns:

  navigation listeners

• collectAfterNavigationObservers

  public static List<AfterNavigationObserver> collectAfterNavigationObservers(UI ui)

  Collect all Components implementing AfterNavigationObserver that are found in the given UI.

  Parameters:

  ui - UI to search from

  Returns:

  after navigation listeners

• collectLocaleChangeObservers

  public static List<LocaleChangeObserver> collectLocaleChangeObservers(Element element)

  Collect all Components implementing LocaleChangeObserver connected to the given element tree.

  Parameters:

  element - element to search from

  Returns:

  navigation listeners

• collectLocaleChangeObservers

  public static List<LocaleChangeObserver> collectLocaleChangeObservers(List<HasElement> components)

  Collect all Components implementing LocaleChangeObserver connected to the tree of all given Components in list.

  Parameters:

  components - components to search

  Returns:

  navigation listeners

• informLocaleChangeObservers

  public static void informLocaleChangeObservers(UI ui)

  Inform components connected to the given ui that implement LocaleChangeObserver about locale change.

  Parameters:

  ui - UI for locale change

• informLocaleChangeObservers

  public static void informLocaleChangeObservers(UI ui, List<HasElement> components)

  Inform components implementing LocaleChangeObserver about locale change.

  Parameters:

  ui - UI for locale change

  components - components to search

• getImplementingComponents

  public static <T> Stream<T> getImplementingComponents(Stream<Element> elementStream, Class<T> type)

  Collect elements with Component implementing listener of type T.

  Type Parameters:

  T - type that is used in filtering

  Parameters:

  elementStream - collected elements

  type - class type to filter by

  Returns:

  stream of components implementing T

• inspectHierarchy

  public static void inspectHierarchy(Element node, Collection<Element> descendants, Predicate<Element> filter)

  Collect all children for given node as a Element stream.

  Parameters:

  node - start node to collect child elements from

  descendants - a collector of descendants to fill

  filter - predicate to check whether a given element and its descendants should be included