// Copyright (c) 2012 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_
#include "base/base_export.h"
#include "base/basictypes.h"
#include "base/message_loop/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 BASE_EXPORT 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_