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68 lines
2.3 KiB
C++
68 lines
2.3 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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 DOM_BASE_GLOBALTEARDOWNOBSERVER_H_
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#define DOM_BASE_GLOBALTEARDOWNOBSERVER_H_
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#include "mozilla/Attributes.h"
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#include "nsIGlobalObject.h"
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#include "nsIScriptGlobalObject.h"
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namespace mozilla {
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class GlobalTeardownObserver
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: public nsISupports,
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public LinkedListElement<GlobalTeardownObserver> {
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public:
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GlobalTeardownObserver();
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explicit GlobalTeardownObserver(nsIGlobalObject* aGlobalObject,
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bool aHasOrHasHadOwnerWindow = false);
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nsGlobalWindowInner* GetOwnerWindow() const;
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nsIGlobalObject* GetOwnerGlobal() const { return mParentObject; }
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bool HasOrHasHadOwnerWindow() const { return mHasOrHasHadOwnerWindow; }
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void GetParentObject(nsIScriptGlobalObject** aParentObject) {
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if (mParentObject) {
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CallQueryInterface(mParentObject, aParentObject);
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} else {
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*aParentObject = nullptr;
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}
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}
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virtual void DisconnectFromOwner();
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// A global permanently becomes invalid when DisconnectEventTargetObjects() is
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// called. Normally this means:
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// - For the main thread, when nsGlobalWindowInner::FreeInnerObjects is
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// called.
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// - For a worker thread, when clearing the main event queue. (Which we do
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// slightly later than when the spec notionally calls for it to be done.)
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//
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// A global may also become temporarily invalid when:
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// - For the main thread, if the window is no longer the WindowProxy's current
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// inner window due to being placed in the bfcache.
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nsresult CheckCurrentGlobalCorrectness() const;
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protected:
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virtual ~GlobalTeardownObserver();
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void BindToOwner(nsIGlobalObject* aOwner);
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private:
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// The parent global object. The global will clear this when
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// it is destroyed by calling DisconnectFromOwner().
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nsIGlobalObject* MOZ_NON_OWNING_REF mParentObject = nullptr;
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// If mParentObject is or has been an inner window, then this is true. It is
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// obtained in BindToOwner.
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bool mHasOrHasHadOwnerWindow = false;
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};
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} // namespace mozilla
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#endif
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