C++ Accessible::IsAutoComplete方法代码示例

void RootAccessible::HandlePopupShownEvent(Accessible* aAccessible) {
  roles::Role role = aAccessible->Role();

  if (role == roles::MENUPOPUP) {
    // Don't fire menupopup events for combobox and autocomplete lists.
    nsEventShell::FireEvent(nsIAccessibleEvent::EVENT_MENUPOPUP_START,
                            aAccessible);
    return;
  }

  if (role == roles::TOOLTIP) {
    // There is a single <xul:tooltip> node which Mozilla moves around.
    // The accessible for it stays the same no matter where it moves.
    // AT's expect to get an EVENT_SHOW for the tooltip.
    // In event callback the tooltip's accessible will be ready.
    nsEventShell::FireEvent(nsIAccessibleEvent::EVENT_SHOW, aAccessible);
    return;
  }

  if (role == roles::COMBOBOX_LIST) {
    // Fire expanded state change event for comboboxes and autocompeletes.
    Accessible* combobox = aAccessible->Parent();
    if (!combobox) return;

    if (combobox->IsCombobox() || combobox->IsAutoComplete()) {
      RefPtr<AccEvent> event =
          new AccStateChangeEvent(combobox, states::EXPANDED, true);
      if (event) nsEventShell::FireEvent(event);
    }
  }
}

role
XULMenupopupAccessible::NativeRole() const
{
  // If accessible is not bound to the tree (this happens while children are
  // cached) return general role.
  if (mParent) {
    if (mParent->IsCombobox() || mParent->IsAutoComplete())
      return roles::COMBOBOX_LIST;

    if (mParent->Role() == roles::PUSHBUTTON) {
      // Some widgets like the search bar have several popups, owned by buttons.
      Accessible* grandParent = mParent->Parent();
      if (grandParent && grandParent->IsAutoComplete())
        return roles::COMBOBOX_LIST;
    }
  }

  return roles::MENUPOPUP;
}

void
RootAccessible::HandlePopupHidingEvent(nsINode* aPopupNode)
{
  // Get popup accessible. There are cases when popup element isn't accessible
  // but an underlying widget is and behaves like popup, an example is
  // autocomplete popups.
  DocAccessible* document = nsAccUtils::GetDocAccessibleFor(aPopupNode);
  if (!document)
    return;

  Accessible* popup = document->GetAccessible(aPopupNode);
  if (!popup) {
    Accessible* popupContainer = document->GetContainerAccessible(aPopupNode);
    if (!popupContainer)
      return;

    uint32_t childCount = popupContainer->ChildCount();
    for (uint32_t idx = 0; idx < childCount; idx++) {
      Accessible* child = popupContainer->GetChildAt(idx);
      if (child->IsAutoCompletePopup()) {
        popup = child;
        break;
      }
    }

    // No popup no events. Focus is managed by DOM. This is a case for
    // menupopups of menus on Linux since there are no accessible for popups.
    if (!popup)
      return;
  }

  // In case of autocompletes and comboboxes fire state change event for
  // expanded state. Note, HTML form autocomplete isn't a subject of state
  // change event because they aren't autocompletes strictly speaking.
  // When popup closes (except nested popups and menus) then fire focus event to
  // where it was. The focus event is expected even if popup didn't take a focus.

  static const uint32_t kNotifyOfFocus = 1;
  static const uint32_t kNotifyOfState = 2;
  uint32_t notifyOf = 0;

  // HTML select is target of popuphidding event. Otherwise get container
  // widget. No container widget means this is either tooltip or menupopup.
  // No events in the former case.
  Accessible* widget = nullptr;
  if (popup->IsCombobox()) {
    widget = popup;
  } else {
    widget = popup->ContainerWidget();
    if (!widget) {
      if (!popup->IsMenuPopup())
        return;

      widget = popup;
    }
  }

  if (popup->IsAutoCompletePopup()) {
    // No focus event for autocomplete because it's managed by
    // DOMMenuItemInactive events.
    if (widget->IsAutoComplete())
      notifyOf = kNotifyOfState;

  } else if (widget->IsCombobox()) {
    // Fire focus for active combobox, otherwise the focus is managed by DOM
    // focus notifications. Always fire state change event.
    if (widget->IsActiveWidget())
      notifyOf = kNotifyOfFocus;
    notifyOf |= kNotifyOfState;

  } else if (widget->IsMenuButton()) {
    // Can be a part of autocomplete.
    Accessible* compositeWidget = widget->ContainerWidget();
    if (compositeWidget && compositeWidget->IsAutoComplete()) {
      widget = compositeWidget;
      notifyOf = kNotifyOfState;
    }

    // Autocomplete (like searchbar) can be inactive when popup hiddens
    notifyOf |= kNotifyOfFocus;

  } else if (widget == popup) {
    // Top level context menus and alerts.
    // Ignore submenus and menubar. When submenu is closed then sumbenu
    // container menuitem takes a focus via DOMMenuItemActive notification.
    // For menubars processing we listen DOMMenubarActive/Inactive
    // notifications.
    notifyOf = kNotifyOfFocus;
  }

  // Restore focus to where it was.
  if (notifyOf & kNotifyOfFocus) {
    FocusMgr()->ActiveItemChanged(nullptr);
#ifdef A11Y_LOG
    if (logging::IsEnabled(logging::eFocus))
      logging::ActiveItemChangeCausedBy("popuphiding", popup);
#endif
  }

  // Fire expanded state change event.
//.........这里部分代码省略.........