C++ AccStateChangeEvent::GetState方法代码示例

nsresult
HTMLFileInputAccessible::HandleAccEvent(AccEvent* aEvent)
{
  nsresult rv = HyperTextAccessibleWrap::HandleAccEvent(aEvent);
  NS_ENSURE_SUCCESS(rv, rv);

  // Redirect state change events for inherited states to child controls. Note,
  // unavailable state is not redirected. That's a standard for unavailable
  // state handling.
  AccStateChangeEvent* event = downcast_accEvent(aEvent);
  if (event &&
      (event->GetState() == states::BUSY ||
       event->GetState() == states::REQUIRED ||
       event->GetState() == states::HASPOPUP ||
       event->GetState() == states::INVALID)) {
    Accessible* button = GetChildAt(0);
    if (button && button->Role() == roles::PUSHBUTTON) {
      nsRefPtr<AccStateChangeEvent> childEvent =
        new AccStateChangeEvent(button, event->GetState(),
                                event->IsStateEnabled(), event->FromUserInput());
      nsEventShell::FireEvent(childEvent);
    }
  }

  return NS_OK;
}

nsresult
AccessibleWrap::FireAtkStateChangeEvent(AccEvent* aEvent,
                                        AtkObject* aObject)
{
    MAI_LOG_DEBUG(("\n\nReceived: EVENT_STATE_CHANGE\n"));

    AccStateChangeEvent* event = downcast_accEvent(aEvent);
    NS_ENSURE_TRUE(event, NS_ERROR_FAILURE);

    bool isEnabled = event->IsStateEnabled();
    PRInt32 stateIndex = AtkStateMap::GetStateIndexFor(event->GetState());
    if (stateIndex >= 0) {
        NS_ASSERTION(gAtkStateMap[stateIndex].stateMapEntryType != kNoSuchState,
                     "No such state");

        if (gAtkStateMap[stateIndex].atkState != kNone) {
            NS_ASSERTION(gAtkStateMap[stateIndex].stateMapEntryType != kNoStateChange,
                         "State changes should not fired for this state");

            if (gAtkStateMap[stateIndex].stateMapEntryType == kMapOpposite)
                isEnabled = !isEnabled;

            // Fire state change for first state if there is one to map
            atk_object_notify_state_change(aObject,
                                           gAtkStateMap[stateIndex].atkState,
                                           isEnabled);
        }
    }

    return NS_OK;
}

already_AddRefed<nsIAccessibleEvent>
a11y::MakeXPCEvent(AccEvent* aEvent)
{
  DocAccessible* doc = aEvent->GetDocAccessible();
  Accessible* acc = aEvent->GetAccessible();
  nsINode* node = acc->GetNode();
  nsIDOMNode* domNode = node ? node->AsDOMNode() : nullptr;
  bool fromUser = aEvent->IsFromUserInput();
  uint32_t type = aEvent->GetEventType();
  uint32_t eventGroup = aEvent->GetEventGroups();
  nsCOMPtr<nsIAccessibleEvent> xpEvent;

  if (eventGroup & (1 << AccEvent::eStateChangeEvent)) {
    AccStateChangeEvent* sc = downcast_accEvent(aEvent);
    bool extra = false;
    uint32_t state = nsAccUtils::To32States(sc->GetState(), &extra);
    xpEvent = new xpcAccStateChangeEvent(type, acc, doc, domNode, fromUser,
                                         state, extra, sc->IsStateEnabled());
    return xpEvent.forget();
  }

  if (eventGroup & (1 << AccEvent::eTextChangeEvent)) {
    AccTextChangeEvent* tc = downcast_accEvent(aEvent);
    nsString text;
    tc->GetModifiedText(text);
    xpEvent = new xpcAccTextChangeEvent(type, acc, doc, domNode, fromUser,
                                        tc->GetStartOffset(), tc->GetLength(),
                                        tc->IsTextInserted(), text);
    return xpEvent.forget();
  }

  if (eventGroup & (1 << AccEvent::eHideEvent)) {
    AccHideEvent* hideEvent = downcast_accEvent(aEvent);
    xpEvent = new xpcAccHideEvent(type, acc, doc, domNode, fromUser,
                                  hideEvent->TargetParent(),
                                  hideEvent->TargetNextSibling(),
                                  hideEvent->TargetPrevSibling());
    return xpEvent.forget();
  }

  if (eventGroup & (1 << AccEvent::eCaretMoveEvent)) {
    AccCaretMoveEvent* cm = downcast_accEvent(aEvent);
    xpEvent = new xpcAccCaretMoveEvent(type, acc, doc, domNode, fromUser,
                                       cm->GetCaretOffset());
    return xpEvent.forget();
  }

  if (eventGroup & (1 << AccEvent::eVirtualCursorChangeEvent)) {
    AccVCChangeEvent* vcc = downcast_accEvent(aEvent);
    xpEvent = new xpcAccVirtualCursorChangeEvent(type, acc, doc, domNode, fromUser,
                                                 vcc->OldAccessible(),
                                                 vcc->OldStartOffset(),
                                                 vcc->OldEndOffset(),
                                                 vcc->Reason());
    return xpEvent.forget();
  }

  xpEvent = new xpcAccEvent(type, acc, doc, domNode, fromUser);
  return xpEvent.forget();
  }

static void
GetDocLoadEventType(AccEvent* aEvent, nsACString& aEventType)
{
  uint32_t type = aEvent->GetEventType();
  if (type == nsIAccessibleEvent::EVENT_DOCUMENT_LOAD_STOPPED) {
    aEventType.AssignLiteral("load stopped");
  } else if (type == nsIAccessibleEvent::EVENT_DOCUMENT_LOAD_COMPLETE) {
    aEventType.AssignLiteral("load complete");
  } else if (type == nsIAccessibleEvent::EVENT_DOCUMENT_RELOAD) {
    aEventType.AssignLiteral("reload");
  } else if (type == nsIAccessibleEvent::EVENT_STATE_CHANGE) {
    AccStateChangeEvent* event = downcast_accEvent(aEvent);
    if (event->GetState() == states::BUSY) {
      aEventType.AssignLiteral("busy ");
      if (event->IsStateEnabled())
        aEventType.AppendLiteral("true");
      else
        aEventType.AppendLiteral("false");
    }
  }
}

nsresult
AccessibleWrap::HandleAccEvent(AccEvent* aEvent)
{
  nsresult rv = Accessible::HandleAccEvent(aEvent);
  NS_ENSURE_SUCCESS(rv, rv);

    Accessible* accessible = aEvent->GetAccessible();
    NS_ENSURE_TRUE(accessible, NS_ERROR_FAILURE);

    // The accessible can become defunct if we have an xpcom event listener
    // which decides it would be fun to change the DOM and flush layout.
    if (accessible->IsDefunct())
        return NS_OK;

    uint32_t type = aEvent->GetEventType();

    AtkObject* atkObj = AccessibleWrap::GetAtkObject(accessible);

  // We don't create ATK objects for plain text leaves, just return NS_OK in
  // such case.
    if (!atkObj) {
        NS_ASSERTION(type == nsIAccessibleEvent::EVENT_SHOW ||
                     type == nsIAccessibleEvent::EVENT_HIDE,
                     "Event other than SHOW and HIDE fired for plain text leaves");
        return NS_OK;
    }

    AccessibleWrap* accWrap = GetAccessibleWrap(atkObj);
    if (!accWrap) {
        return NS_OK; // Node is shut down
    }

    switch (type) {
    case nsIAccessibleEvent::EVENT_STATE_CHANGE:
      {
        AccStateChangeEvent* event = downcast_accEvent(aEvent);
        MAI_ATK_OBJECT(atkObj)->FireStateChangeEvent(event->GetState(),
                                                     event->IsStateEnabled());
        break;
      }

    case nsIAccessibleEvent::EVENT_TEXT_REMOVED:
    case nsIAccessibleEvent::EVENT_TEXT_INSERTED:
        return FireAtkTextChangedEvent(aEvent, atkObj);

    case nsIAccessibleEvent::EVENT_FOCUS:
      {
        a11y::RootAccessible* rootAccWrap = accWrap->RootAccessible();
        if (rootAccWrap && rootAccWrap->mActivated) {
            atk_focus_tracker_notify(atkObj);
            // Fire state change event for focus
            atk_object_notify_state_change(atkObj, ATK_STATE_FOCUSED, true);
            return NS_OK;
        }
      } break;

    case nsIAccessibleEvent::EVENT_NAME_CHANGE:
      {
        nsAutoString newName;
        accessible->Name(newName);

        MaybeFireNameChange(atkObj, newName);

        break;
      }

  case nsIAccessibleEvent::EVENT_VALUE_CHANGE:
    if (accessible->HasNumericValue()) {
      // Make sure this is a numeric value. Don't fire for string value changes
      // (e.g. text editing) ATK values are always numeric.
      g_object_notify((GObject*)atkObj, "accessible-value");
    }
    break;

    case nsIAccessibleEvent::EVENT_SELECTION:
    case nsIAccessibleEvent::EVENT_SELECTION_ADD:
    case nsIAccessibleEvent::EVENT_SELECTION_REMOVE:
    {
      // XXX: dupe events may be fired
      AccSelChangeEvent* selChangeEvent = downcast_accEvent(aEvent);
      g_signal_emit_by_name(AccessibleWrap::GetAtkObject(selChangeEvent->Widget()),
                            "selection_changed");
      break;
    }

    case nsIAccessibleEvent::EVENT_SELECTION_WITHIN:
    {
      g_signal_emit_by_name(atkObj, "selection_changed");
      break;
    }

    case nsIAccessibleEvent::EVENT_TEXT_SELECTION_CHANGED:
        g_signal_emit_by_name(atkObj, "text_selection_changed");
        break;

    case nsIAccessibleEvent::EVENT_TEXT_CARET_MOVED:
      {
        AccCaretMoveEvent* caretMoveEvent = downcast_accEvent(aEvent);
        NS_ASSERTION(caretMoveEvent, "Event needs event data");
        if (!caretMoveEvent)
//.........这里部分代码省略.........

nsresult AccessibleWrap::HandleAccEvent(AccEvent* aEvent) {
  auto accessible = static_cast<AccessibleWrap*>(aEvent->GetAccessible());
  NS_ENSURE_TRUE(accessible, NS_ERROR_FAILURE);
  DocAccessibleWrap* doc =
      static_cast<DocAccessibleWrap*>(accessible->Document());
  if (doc) {
    switch (aEvent->GetEventType()) {
      case nsIAccessibleEvent::EVENT_FOCUS: {
        if (DocAccessibleWrap* topContentDoc =
                doc->GetTopLevelContentDoc(accessible)) {
          topContentDoc->CacheFocusPath(accessible);
        }
        break;
      }
      case nsIAccessibleEvent::EVENT_VIRTUALCURSOR_CHANGED: {
        AccVCChangeEvent* vcEvent = downcast_accEvent(aEvent);
        auto newPosition =
            static_cast<AccessibleWrap*>(vcEvent->NewAccessible());
        if (newPosition) {
          if (DocAccessibleWrap* topContentDoc =
                  doc->GetTopLevelContentDoc(accessible)) {
            topContentDoc->CacheFocusPath(newPosition);
          }
        }
        break;
      }
    }
  }

  nsresult rv = Accessible::HandleAccEvent(aEvent);
  NS_ENSURE_SUCCESS(rv, rv);

  if (IPCAccessibilityActive()) {
    return NS_OK;
  }

  // The accessible can become defunct if we have an xpcom event listener
  // which decides it would be fun to change the DOM and flush layout.
  if (accessible->IsDefunct() || !accessible->IsBoundToParent()) {
    return NS_OK;
  }

  if (doc) {
    if (!nsCoreUtils::IsContentDocument(doc->DocumentNode())) {
      return NS_OK;
    }
  }

  SessionAccessibility* sessionAcc =
      SessionAccessibility::GetInstanceFor(accessible);
  if (!sessionAcc) {
    return NS_OK;
  }

  switch (aEvent->GetEventType()) {
    case nsIAccessibleEvent::EVENT_FOCUS:
      sessionAcc->SendFocusEvent(accessible);
      break;
    case nsIAccessibleEvent::EVENT_VIRTUALCURSOR_CHANGED: {
      AccVCChangeEvent* vcEvent = downcast_accEvent(aEvent);
      auto newPosition = static_cast<AccessibleWrap*>(vcEvent->NewAccessible());
      auto oldPosition = static_cast<AccessibleWrap*>(vcEvent->OldAccessible());

      if (sessionAcc && newPosition) {
        if (oldPosition != newPosition) {
          if (vcEvent->Reason() == nsIAccessiblePivot::REASON_POINT) {
            sessionAcc->SendHoverEnterEvent(newPosition);
          } else {
            sessionAcc->SendAccessibilityFocusedEvent(newPosition);
          }
        }

        if (vcEvent->BoundaryType() != nsIAccessiblePivot::NO_BOUNDARY) {
          sessionAcc->SendTextTraversedEvent(
              newPosition, vcEvent->NewStartOffset(), vcEvent->NewEndOffset());
        }
      }
      break;
    }
    case nsIAccessibleEvent::EVENT_TEXT_CARET_MOVED: {
      AccCaretMoveEvent* event = downcast_accEvent(aEvent);
      sessionAcc->SendTextSelectionChangedEvent(accessible,
                                                event->GetCaretOffset());
      break;
    }
    case nsIAccessibleEvent::EVENT_TEXT_INSERTED:
    case nsIAccessibleEvent::EVENT_TEXT_REMOVED: {
      AccTextChangeEvent* event = downcast_accEvent(aEvent);
      sessionAcc->SendTextChangedEvent(
          accessible, event->ModifiedText(), event->GetStartOffset(),
          event->GetLength(), event->IsTextInserted(),
          event->IsFromUserInput());
      break;
    }
    case nsIAccessibleEvent::EVENT_STATE_CHANGE: {
      AccStateChangeEvent* event = downcast_accEvent(aEvent);
      auto state = event->GetState();
      if (state & states::CHECKED) {
        sessionAcc->SendClickedEvent(accessible, event->IsStateEnabled());
      }
//.........这里部分代码省略.........