1 files changed, 96 insertions, 0 deletions
diff --git a/layout/xul/nsXULLabelFrame.cpp b/layout/xul/nsXULLabelFrame.cpp
new file mode 100644
index 0000000000..b2f187dcd4
--- /dev/null
+++ b/layout/xul/nsXULLabelFrame.cpp
@@ -0,0 +1,96 @@
+/* -*- 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/. */
+
+/* derived class of nsBlockFrame used for xul:label elements */
+
+#include "nsXULLabelFrame.h"
+
+#include "mozilla/EventStateManager.h"
+#include "mozilla/PresShell.h"
+#include "nsHTMLParts.h"
+#include "nsNameSpaceManager.h"
+
+using namespace mozilla;
+
+nsIFrame* NS_NewXULLabelFrame(PresShell* aPresShell, ComputedStyle* aStyle) {
+  nsXULLabelFrame* it =
+      new (aPresShell) nsXULLabelFrame(aStyle, aPresShell->GetPresContext());
+  it->AddStateBits(NS_BLOCK_FORMATTING_CONTEXT_STATE_BITS);
+  return it;
+}
+
+NS_IMPL_FRAMEARENA_HELPERS(nsXULLabelFrame)
+
+// If you make changes to this function, check its counterparts
+// in nsBoxFrame and nsTextBoxFrame
+nsresult nsXULLabelFrame::RegUnregAccessKey(bool aDoReg) {
+  // To filter out <label>s without a control attribute.
+  // XXXjag a side-effect is that we filter out anonymous <label>s
+  // in e.g. <menu>, <menuitem>, <button>. These <label>s inherit
+  // |accesskey| and would otherwise register themselves, overwriting
+  // the content we really meant to be registered.
+  if (!mContent->AsElement()->HasAttr(kNameSpaceID_None, nsGkAtoms::control))
+    return NS_OK;
+
+  nsAutoString accessKey;
+  mContent->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::accesskey,
+                                 accessKey);
+
+  if (accessKey.IsEmpty()) return NS_OK;
+
+  // With a valid PresContext we can get the ESM
+  // and register the access key
+  EventStateManager* esm = PresContext()->EventStateManager();
+
+  uint32_t key = accessKey.First();
+  if (aDoReg)
+    esm->RegisterAccessKey(mContent->AsElement(), key);
+  else
+    esm->UnregisterAccessKey(mContent->AsElement(), key);
+
+  return NS_OK;
+}
+
+/////////////////////////////////////////////////////////////////////////////
+// nsIFrame
+
+void nsXULLabelFrame::Init(nsIContent* aContent, nsContainerFrame* aParent,
+                           nsIFrame* aPrevInFlow) {
+  nsBlockFrame::Init(aContent, aParent, aPrevInFlow);
+
+  // register access key
+  RegUnregAccessKey(true);
+}
+
+void nsXULLabelFrame::DestroyFrom(nsIFrame* aDestructRoot,
+                                  PostDestroyData& aPostDestroyData) {
+  // unregister access key
+  RegUnregAccessKey(false);
+  nsBlockFrame::DestroyFrom(aDestructRoot, aPostDestroyData);
+}
+
+nsresult nsXULLabelFrame::AttributeChanged(int32_t aNameSpaceID,
+                                           nsAtom* aAttribute,
+                                           int32_t aModType) {
+  nsresult rv =
+      nsBlockFrame::AttributeChanged(aNameSpaceID, aAttribute, aModType);
+
+  // If the accesskey changed, register for the new value
+  // The old value has been unregistered in nsXULElement::SetAttr
+  if (aAttribute == nsGkAtoms::accesskey || aAttribute == nsGkAtoms::control)
+    RegUnregAccessKey(true);
+
+  return rv;
+}
+
+/////////////////////////////////////////////////////////////////////////////
+// Diagnostics
+
+#ifdef DEBUG_FRAME_DUMP
+nsresult nsXULLabelFrame::GetFrameName(nsAString& aResult) const {
+  return MakeFrameName(u"XULLabel"_ns, aResult);
+}
+#endif