1 files changed, 118 insertions, 0 deletions
diff --git a/dom/html/HTMLSummaryElement.cpp b/dom/html/HTMLSummaryElement.cpp
new file mode 100644
index 0000000000..d1fcf22598
--- /dev/null
+++ b/dom/html/HTMLSummaryElement.cpp
@@ -0,0 +1,118 @@
+/* -*- 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(bool aWithMouse, bool* aIsFocusable,
+                                         int32_t* aTabIndex) {
+  bool disallowOverridingFocusability = nsGenericHTMLElement::IsHTMLFocusable(
+      aWithMouse, 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