1 files changed, 49 insertions, 0 deletions
diff --git a/base/mac/scoped_sending_event.h b/base/mac/scoped_sending_event.h
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+++ b/base/mac/scoped_sending_event.h
@@ -0,0 +1,49 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef BASE_MAC_SCOPED_SENDING_EVENT_H_
+#define BASE_MAC_SCOPED_SENDING_EVENT_H_
+#pragma once
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_nsobject.h"
+#include "base/message_pump_mac.h"
+
+// Nested event loops can pump IPC messages, including
+// script-initiated tab closes, which could release objects that the
+// nested event loop might message.  CrAppProtocol defines how to ask
+// the embedding NSApplication subclass if an event is currently being
+// handled, in which case such closes are deferred to the top-level
+// event loop.
+//
+// ScopedSendingEvent allows script-initiated event loops to work like
+// a nested event loop, as such events do not arrive via -sendEvent:.
+// CrAppControlProtocol lets ScopedSendingEvent tell the embedding
+// NSApplication what to return from -handlingSendEvent.
+
+@protocol CrAppControlProtocol<CrAppProtocol>
+- (void)setHandlingSendEvent:(BOOL)handlingSendEvent;
+@end
+
+namespace base {
+namespace mac {
+
+class ScopedSendingEvent {
+ public:
+  ScopedSendingEvent();
+  ~ScopedSendingEvent();
+
+ private:
+  // The NSApp in control at the time the constructor was run, to be
+  // sure the |handling_| setting is restored appropriately.
+  NSObject<CrAppControlProtocol>* app_;
+  BOOL handling_;  // Value of -[app_ handlingSendEvent] at construction.
+
+  DISALLOW_COPY_AND_ASSIGN(ScopedSendingEvent);
+};
+
+}  // namespace mac
+}  // namespace base
+
+#endif  // BASE_MAC_SCOPED_SENDING_EVENT_H_