1 files changed, 52 insertions, 0 deletions
diff --git a/layout/generic/nsAutoCopyListener.h b/layout/generic/nsAutoCopyListener.h
new file mode 100644
index 000000000..c580f5260
--- /dev/null
+++ b/layout/generic/nsAutoCopyListener.h
@@ -0,0 +1,52 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* 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 nsAutoCopyListener_h_
+#define nsAutoCopyListener_h_
+
+#include "nsISelectionListener.h"
+#include "nsISelectionPrivate.h"
+#include "mozilla/Attributes.h"
+
+class nsAutoCopyListener final : public nsISelectionListener
+{
+public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSISELECTIONLISTENER
+
+  explicit nsAutoCopyListener(int16_t aClipboardID)
+    : mCachedClipboard(aClipboardID)
+  {}
+
+  void Listen(nsISelectionPrivate *aSelection)
+  {
+      NS_ASSERTION(aSelection, "Null selection passed to Listen()");
+      aSelection->AddSelectionListener(this);
+  }
+
+  static nsAutoCopyListener* GetInstance(int16_t aClipboardID)
+  {
+    if (!sInstance) {
+      sInstance = new nsAutoCopyListener(aClipboardID);
+
+      NS_ADDREF(sInstance);
+    }
+
+    return sInstance;
+  }
+
+  static void Shutdown()
+  {
+    NS_IF_RELEASE(sInstance);
+  }
+
+private:
+  ~nsAutoCopyListener() {}
+
+  static nsAutoCopyListener* sInstance;
+  int16_t mCachedClipboard;
+};
+
+#endif