From 6bf0a5cb5034a7e684dcc3500e841785237ce2dd Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 19:32:43 +0200 Subject: Adding upstream version 1:115.7.0. Signed-off-by: Daniel Baumann --- widget/nsAutoRollup.h | 54 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) create mode 100644 widget/nsAutoRollup.h (limited to 'widget/nsAutoRollup.h') diff --git a/widget/nsAutoRollup.h b/widget/nsAutoRollup.h new file mode 100644 index 0000000000..f6f3685887 --- /dev/null +++ b/widget/nsAutoRollup.h @@ -0,0 +1,54 @@ +/* -*- 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); + + 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 sLastRollup; +}; + +} // namespace widget +} // namespace mozilla + +#endif // nsAutoRollup_h__ -- cgit v1.2.3