1 files changed, 59 insertions, 0 deletions
diff --git a/widget/windows/WinModifierKeyState.h b/widget/windows/WinModifierKeyState.h
new file mode 100644
index 0000000000..0788c25939
--- /dev/null
+++ b/widget/windows/WinModifierKeyState.h
@@ -0,0 +1,59 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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_widget_WinModifierKeyState_h_
+#define mozilla_widget_WinModifierKeyState_h_
+
+#include "mozilla/RefPtr.h"
+#include "mozilla/EventForwards.h"
+#include "nsStringFwd.h"
+#include <windows.h>
+
+namespace mozilla {
+namespace widget {
+
+class MOZ_STACK_CLASS ModifierKeyState final {
+ public:
+  ModifierKeyState();
+  explicit ModifierKeyState(Modifiers aModifiers);
+
+  void Update();
+
+  void Unset(Modifiers aRemovingModifiers);
+  void Set(Modifiers aAddingModifiers);
+
+  void InitInputEvent(WidgetInputEvent& aInputEvent) const;
+
+  // Do not create IsAltGr() because it's unclear whether:
+  // - AltGr key is actually pressed.
+  // - Both Ctrl and Alt keys are pressed when a keyboard layout which
+  //   has AltGr key.
+  // - Both Ctrl and Alt keys are pressed when a keyboard layout which
+  //   does not have AltGr key.
+  bool IsShift() const;
+  bool IsControl() const;
+  bool IsAlt() const;
+  bool IsWin() const;
+
+  bool MaybeMatchShortcutKey() const;
+
+  bool IsCapsLocked() const;
+  bool IsNumLocked() const;
+  bool IsScrollLocked() const;
+
+  MOZ_ALWAYS_INLINE Modifiers GetModifiers() const { return mModifiers; }
+
+ private:
+  Modifiers mModifiers;
+
+  void InitMouseEvent(WidgetInputEvent& aMouseEvent) const;
+};
+
+const nsCString ToString(const ModifierKeyState& aModifierKeyState);
+
+}  // namespace widget
+}  // namespace mozilla
+
+#endif  // #ifndef mozilla_widget_WinModifierKeyState_h_