1 files changed, 71 insertions, 0 deletions
diff --git a/gfx/layers/apz/src/FocusTarget.h b/gfx/layers/apz/src/FocusTarget.h
new file mode 100644
index 0000000000..f4caa5d070
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+++ b/gfx/layers/apz/src/FocusTarget.h
@@ -0,0 +1,71 @@
+/* -*- 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/. */
+
+#ifndef mozilla_layers_FocusTarget_h
+#define mozilla_layers_FocusTarget_h
+
+#include <stdint.h>  // for int32_t, uint32_t
+
+#include "mozilla/DefineEnum.h"                  // for MOZ_DEFINE_ENUM
+#include "mozilla/layers/ScrollableLayerGuid.h"  // for ViewID
+#include "mozilla/Variant.h"                     // for Variant
+#include "mozilla/Maybe.h"                       // for Maybe
+
+namespace mozilla {
+
+class PresShell;
+
+namespace layers {
+
+/**
+ * This class is used for communicating information about the currently focused
+ * element of a document and the scrollable frames to use when keyboard
+ * scrolling it. It is created on the main thread at paint-time, but is then
+ * passed over IPC to the compositor/APZ code.
+ */
+class FocusTarget final {
+ public:
+  struct ScrollTargets {
+    ScrollableLayerGuid::ViewID mHorizontal;
+    ScrollableLayerGuid::ViewID mVertical;
+
+    bool operator==(const ScrollTargets& aRhs) const {
+      return (mHorizontal == aRhs.mHorizontal && mVertical == aRhs.mVertical);
+    }
+  };
+
+  // We need this to represent the case where mData has no focus target data
+  // because we can't have an empty variant
+  struct NoFocusTarget {
+    bool operator==(const NoFocusTarget& aRhs) const { return true; }
+  };
+
+  FocusTarget();
+
+  /**
+   * Construct a focus target for the specified top level PresShell
+   */
+  FocusTarget(PresShell* aRootPresShell, uint64_t aFocusSequenceNumber);
+
+  bool operator==(const FocusTarget& aRhs) const;
+
+  const char* Type() const;
+
+ public:
+  // The content sequence number recorded at the time of this class's creation
+  uint64_t mSequenceNumber;
+
+  // Whether there are keydown, keypress, or keyup event listeners
+  // in the event target chain of the focused element
+  bool mFocusHasKeyEventListeners;
+
+  mozilla::Variant<LayersId, ScrollTargets, NoFocusTarget> mData;
+};
+
+}  // namespace layers
+}  // namespace mozilla
+
+#endif  // mozilla_layers_FocusTarget_h