/* -*- 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 nsAutoRollup_h__ #define nsAutoRollup_h__
#include"mozilla/Attributes.h"// for MOZ_RAII #include"mozilla/StaticPtr.h"// for StaticRefPtr #include"nsIContent.h"
namespace mozilla { namespace widget {
// A situation can occur when a mouse event occurs over a menu label while the // menu popup is already open. The expected behaviour is to close the popup. // This happens by calling nsIRollupListener::Rollup before the mouse event is // processed. However, in cases where the mouse event is not consumed, this // event will then get targeted at the menu label causing the menu to open // again. To prevent this, we store in sLastRollup a reference to the popup // that was closed during the Rollup call, and prevent this popup from // reopening while processing the mouse event. // sLastRollup can only be set while an nsAutoRollup is in scope; // when it goes out of scope sLastRollup is cleared automatically. // As sLastRollup is static, it can be retrieved by calling // nsAutoRollup::GetLastRollup. class MOZ_RAII nsAutoRollup { public:
nsAutoRollup();
~nsAutoRollup();
// Convenience constructor that creates a nsAutoRollup and also sets // the last rollup. explicit nsAutoRollup(nsIContent* aRollup);
staticvoid SetLastRollup(nsIContent* aLastRollup); // Return the popup that was last rolled up, or null if there isn't one. static nsIContent* GetLastRollup();
private: // Whether sLastRollup was clear when this nsAutoRollup // was created. bool mWasClear;
// The number of nsAutoRollup instances active. static uint32_t sCount; // The last rolled up popup. static StaticRefPtr<nsIContent> sLastRollup;
};
} // namespace widget
} // namespace mozilla
#endif// nsAutoRollup_h__
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