1 files changed, 104 insertions, 0 deletions
diff --git a/dom/xul/XULTooltipElement.cpp b/dom/xul/XULTooltipElement.cpp
new file mode 100644
index 0000000000..cf9e46c1ca
--- /dev/null
+++ b/dom/xul/XULTooltipElement.cpp
@@ -0,0 +1,104 @@
+/* -*- 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 "nsCOMPtr.h"
+#include "mozilla/dom/Event.h"
+#include "mozilla/dom/XULTooltipElement.h"
+#include "mozilla/dom/NodeInfo.h"
+#include "mozilla/EventDispatcher.h"
+#include "nsContentCreatorFunctions.h"
+#include "nsContentUtils.h"
+#include "nsCTooltipTextProvider.h"
+#include "nsITooltipTextProvider.h"
+#include "nsServiceManagerUtils.h"
+#include "nsThreadUtils.h"
+
+namespace mozilla::dom {
+
+nsXULElement* NS_NewXULTooltipElement(
+    already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo) {
+  RefPtr<mozilla::dom::NodeInfo> nodeInfo(aNodeInfo);
+  auto* nim = nodeInfo->NodeInfoManager();
+  RefPtr<XULTooltipElement> tooltip =
+      new (nim) XULTooltipElement(nodeInfo.forget());
+  NS_ENSURE_SUCCESS(tooltip->Init(), nullptr);
+  return tooltip;
+}
+
+nsresult XULTooltipElement::Init() {
+  // Create the default child label node that will contain the text of the
+  // tooltip.
+  RefPtr<mozilla::dom::NodeInfo> nodeInfo;
+  nodeInfo = mNodeInfo->NodeInfoManager()->GetNodeInfo(
+      nsGkAtoms::description, nullptr, kNameSpaceID_XUL, nsINode::ELEMENT_NODE);
+  nsCOMPtr<Element> description;
+  nsresult rv = NS_NewXULElement(getter_AddRefs(description), nodeInfo.forget(),
+                                 dom::NOT_FROM_PARSER);
+  NS_ENSURE_SUCCESS(rv, rv);
+  description->SetAttr(kNameSpaceID_None, nsGkAtoms::_class,
+                       u"tooltip-label"_ns, false);
+  ErrorResult error;
+  AppendChild(*description, error);
+
+  return error.StealNSResult();
+}
+
+void XULTooltipElement::AfterSetAttr(int32_t aNameSpaceID, nsAtom* aName,
+                                     const nsAttrValue* aValue,
+                                     const nsAttrValue* aOldValue,
+                                     nsIPrincipal* aSubjectPrincipal,
+                                     bool aNotify) {
+  if (aNameSpaceID == kNameSpaceID_None && aName == nsGkAtoms::label) {
+    // When the label attribute of this node changes propagate the text down
+    // into child description element.
+    nsCOMPtr<nsIContent> description = GetFirstChild();
+    if (description && description->IsXULElement(nsGkAtoms::description)) {
+      nsAutoString value;
+      if (aValue) {
+        aValue->ToString(value);
+      }
+      nsContentUtils::AddScriptRunner(NS_NewRunnableFunction(
+          "XULTooltipElement::AfterSetAttr", [description, value]() {
+            Element* descriptionElement = description->AsElement();
+            descriptionElement->SetTextContent(value, IgnoreErrors());
+          }));
+    }
+  }
+  return nsXULElement::AfterSetAttr(aNameSpaceID, aName, aValue, aOldValue,
+                                    aSubjectPrincipal, aNotify);
+}
+
+nsresult XULTooltipElement::PostHandleEvent(EventChainPostVisitor& aVisitor) {
+  if (aVisitor.mEvent->mMessage == eXULPopupShowing &&
+      aVisitor.mEvent->IsTrusted() && !aVisitor.mEvent->DefaultPrevented() &&
+      AttrValueIs(kNameSpaceID_None, nsGkAtoms::page, nsGkAtoms::_true,
+                  eCaseMatters) &&
+      !AttrValueIs(kNameSpaceID_None, nsGkAtoms::titletip, nsGkAtoms::_true,
+                   eCaseMatters)) {
+    // When the tooltip node has the "page" attribute set to "true" the
+    // tooltip text provider is used to find the tooltip text from page where
+    // mouse is hovering over.
+    nsCOMPtr<nsITooltipTextProvider> textProvider =
+        do_GetService(NS_DEFAULTTOOLTIPTEXTPROVIDER_CONTRACTID);
+    nsString text;
+    nsString direction;
+    bool shouldChange = false;
+    if (textProvider) {
+      textProvider->GetNodeText(GetTriggerNode(), getter_Copies(text),
+                                getter_Copies(direction), &shouldChange);
+    }
+    if (shouldChange) {
+      SetAttr(kNameSpaceID_None, nsGkAtoms::label, text, true);
+      SetAttr(kNameSpaceID_None, nsGkAtoms::direction, direction, true);
+    } else {
+      aVisitor.mEventStatus = nsEventStatus_eConsumeNoDefault;
+      aVisitor.mEvent->PreventDefault();
+    }
+  }
+  return NS_OK;
+}
+
+}  // namespace mozilla::dom