forked from mirrors/gecko-dev
55 lines
2 KiB
C++
55 lines
2 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsAutoRollup_h__
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#define nsAutoRollup_h__
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#include "mozilla/Attributes.h" // for MOZ_RAII
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#include "mozilla/StaticPtr.h" // for StaticRefPtr
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#include "nsIContent.h"
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namespace mozilla {
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namespace widget {
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// A situation can occur when a mouse event occurs over a menu label while the
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// menu popup is already open. The expected behaviour is to close the popup.
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// This happens by calling nsIRollupListener::Rollup before the mouse event is
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// processed. However, in cases where the mouse event is not consumed, this
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// event will then get targeted at the menu label causing the menu to open
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// again. To prevent this, we store in sLastRollup a reference to the popup
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// that was closed during the Rollup call, and prevent this popup from
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// reopening while processing the mouse event.
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// sLastRollup can only be set while an nsAutoRollup is in scope;
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// when it goes out of scope sLastRollup is cleared automatically.
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// As sLastRollup is static, it can be retrieved by calling
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// nsAutoRollup::GetLastRollup.
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class MOZ_RAII nsAutoRollup
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{
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public:
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nsAutoRollup();
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~nsAutoRollup();
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// Convenience constructor that creates a nsAutoRollup and also sets
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// the last rollup.
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explicit nsAutoRollup(nsIContent* aRollup);
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static void SetLastRollup(nsIContent* aLastRollup);
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// Return the popup that was last rolled up, or null if there isn't one.
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static nsIContent* GetLastRollup();
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private:
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// Whether sLastRollup was clear when this nsAutoRollup
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// was created.
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bool mWasClear;
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// The number of nsAutoRollup instances active.
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static uint32_t sCount;
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// The last rolled up popup.
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static StaticRefPtr<nsIContent> sLastRollup;
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};
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} // namespace widget
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} // namespace mozilla
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#endif // nsAutoRollup_h__
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