forked from mirrors/gecko-dev
90 lines
3.2 KiB
C++
90 lines
3.2 KiB
C++
/* 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 nsQueryActor_h
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#define nsQueryActor_h
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#include <type_traits>
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#include "nsCOMPtr.h"
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#include "nsPIDOMWindow.h"
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#include "mozilla/RefPtr.h"
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#include "mozilla/dom/Document.h"
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#include "mozilla/dom/JSActor.h"
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#include "mozilla/dom/JSActorManager.h"
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#include "mozilla/dom/ScriptSettings.h"
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#include "mozilla/dom/WindowGlobalChild.h"
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class nsIDOMProcessChild;
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class nsIDOMProcessParent;
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// This type is used to get an XPCOM interface implemented by a JSActor from its
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// native manager.
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class MOZ_STACK_CLASS nsQueryJSActor final : public nsCOMPtr_helper {
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public:
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nsQueryJSActor(const nsLiteralCString aActorName,
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mozilla::dom::JSActorManager* aManager)
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: mActorName(aActorName), mManager(aManager) {}
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nsresult NS_FASTCALL operator()(const nsIID& aIID,
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void** aResult) const override {
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if (!mManager) {
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return NS_ERROR_NO_INTERFACE;
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}
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mozilla::dom::AutoJSAPI jsapi;
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jsapi.Init();
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RefPtr<mozilla::dom::JSActor> actor =
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mManager->GetActor(jsapi.cx(), mActorName, mozilla::IgnoreErrors());
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if (!actor) {
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return NS_ERROR_NO_INTERFACE;
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}
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return actor->QueryInterfaceActor(aIID, aResult);
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}
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private:
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const nsLiteralCString mActorName;
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mozilla::dom::JSActorManager* mManager;
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};
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// Request an XPCOM interface from a JSActor managed by `aManager`.
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//
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// These APIs will work with both JSWindowActors and JSProcessActors.
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template <size_t length>
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inline nsQueryJSActor do_QueryActor(const char (&aActorName)[length],
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mozilla::dom::JSActorManager* aManager) {
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return nsQueryJSActor(nsLiteralCString(aActorName), aManager);
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}
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// Overload for directly querying a JSWindowActorChild from an inner window.
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template <size_t length>
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inline nsQueryJSActor do_QueryActor(const char (&aActorName)[length],
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nsPIDOMWindowInner* aWindow) {
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return nsQueryJSActor(nsLiteralCString(aActorName),
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aWindow ? aWindow->GetWindowGlobalChild() : nullptr);
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}
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// Overload for directly querying a JSWindowActorChild from a document.
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template <size_t length>
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inline nsQueryJSActor do_QueryActor(const char (&aActorName)[length],
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mozilla::dom::Document* aDoc) {
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return nsQueryJSActor(nsLiteralCString(aActorName),
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aDoc ? aDoc->GetWindowGlobalChild() : nullptr);
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}
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// Overload for directly querying from a nsIDOMProcess{Parent,Child} without
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// confusing overload selection for types inheriting from both
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// nsIDOMProcess{Parent,Child} and JSActorManager.
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template <size_t length, typename T,
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typename = std::enable_if_t<std::is_same_v<T, nsIDOMProcessParent> ||
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std::is_same_v<T, nsIDOMProcessChild>>>
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inline nsQueryJSActor do_QueryActor(const char (&aActorName)[length],
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T* aManager) {
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return nsQueryJSActor(nsLiteralCString(aActorName),
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aManager ? aManager->AsJSActorManager() : nullptr);
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}
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#endif // defined nsQueryActor_h
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