Quelle HTMLSummaryElement.cpp Sprache: C

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "mozilla/dom/HTMLSummaryElement.h"

#include "mozilla/dom/HTMLDetailsElement.h"
#include "mozilla/dom/HTMLElementBinding.h"
#include "mozilla/dom/HTMLUnknownElement.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/MouseEvents.h"
#include "mozilla/Preferences.h"
#include "mozilla/TextEvents.h"
#include "nsFocusManager.h"

NS_IMPL_NS_NEW_HTML_ELEMENT(Summary)

namespace mozilla::dom {

HTMLSummaryElement::~HTMLSummaryElement() = default;

NS_IMPL_ELEMENT_CLONE(HTMLSummaryElement)

nsresult HTMLSummaryElement::PostHandleEvent(EventChainPostVisitor& aVisitor) {
  nsresult rv = NS_OK;
  if (!aVisitor.mPresContext) {
    return rv;
  }

  if (aVisitor.mEventStatus == nsEventStatus_eConsumeNoDefault) {
    return rv;
  }

  if (!IsMainSummary()) {
    return rv;
  }

  WidgetEvent* const event = aVisitor.mEvent;
  nsCOMPtr<Element> target =
      do_QueryInterface(event->GetOriginalDOMEventTarget());
  if (nsContentUtils::IsInInteractiveHTMLContent(target, this)) {
    return NS_OK;
  }

  if (event->HasMouseEventMessage()) {
    WidgetMouseEvent* mouseEvent = event->AsMouseEvent();

    if (mouseEvent->IsLeftClickEvent()) {
      RefPtr<HTMLDetailsElement> details = GetDetails();
      MOZ_ASSERT(details,
                 "Expected to find details since this is the main summary!");

      // When dispatching a synthesized mouse click event to a details element
      // with 'display: none', both Chrome and Safari do not toggle the 'open'
      // attribute. We had tried to be compatible with this behavior, but found
      // more inconsistency in test cases in bug 1245424. So we stop doing that.
      details->ToggleOpen();
      aVisitor.mEventStatus = nsEventStatus_eConsumeNoDefault;
      return NS_OK;
    }
  }  // event->HasMouseEventMessage()

  if (event->HasKeyEventMessage() && event->IsTrusted()) {
    HandleKeyboardActivation(aVisitor);
  }
  return rv;
}

bool HTMLSummaryElement::IsHTMLFocusable(IsFocusableFlags aFlags,
                                         bool* aIsFocusable,
                                         int32_t* aTabIndex) {
  bool disallowOverridingFocusability =
      nsGenericHTMLElement::IsHTMLFocusable(aFlags, aIsFocusable, aTabIndex);

  if (disallowOverridingFocusability || !IsMainSummary()) {
    return disallowOverridingFocusability;
  }

  // The main summary element is focusable.
  *aIsFocusable = true;

  // Give a chance to allow the subclass to override aIsFocusable.
  return false;
}

int32_t HTMLSummaryElement::TabIndexDefault() {
  // Make the main summary be able to navigate via tab, and be focusable.
  // See nsGenericHTMLElement::IsHTMLFocusable().
  return IsMainSummary() ? 0 : nsGenericHTMLElement::TabIndexDefault();
}

bool HTMLSummaryElement::IsMainSummary() const {
  HTMLDetailsElement* details = GetDetails();
  if (!details) {
    return false;
  }

  return details->GetFirstSummary() == this ||
         GetContainingShadow() == details->GetShadowRoot();
}

HTMLDetailsElement* HTMLSummaryElement::GetDetails() const {
  if (auto* details = HTMLDetailsElement::FromNodeOrNull(GetParent())) {
    return details;
  }
  if (!HasBeenInUAWidget()) {
    return nullptr;
  }
  return HTMLDetailsElement::FromNodeOrNull(GetContainingShadowHost());
}

JSObject* HTMLSummaryElement::WrapNode(JSContext* aCx,
                                       JS::Handle<JSObject*> aGivenProto) {
  return HTMLElement_Binding::Wrap(aCx, this, aGivenProto);
}

}  // namespace mozilla::dom

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