зеркало из https://github.com/mozilla/gecko-dev.git
57 строки
2.0 KiB
C++
57 строки
2.0 KiB
C++
/* -*- 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
|
|
|
|
class nsIContent;
|
|
|
|
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);
|
|
|
|
static void 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__
|