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Diffstat (limited to 'dom/events/DOMEventTargetHelper.h')
| -rw-r--r-- | dom/events/DOMEventTargetHelper.h | 310 |
1 files changed, 310 insertions, 0 deletions
diff --git a/dom/events/DOMEventTargetHelper.h b/dom/events/DOMEventTargetHelper.h new file mode 100644 index 0000000000..c5a0611c99 --- /dev/null +++ b/dom/events/DOMEventTargetHelper.h @@ -0,0 +1,310 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* 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 mozilla_DOMEventTargetHelper_h_ +#define mozilla_DOMEventTargetHelper_h_ + +#include "nsCOMPtr.h" +#include "nsGkAtoms.h" +#include "nsCycleCollectionParticipant.h" +#include "nsPIDOMWindow.h" +#include "nsIScriptGlobalObject.h" +#include "nsIScriptContext.h" +#include "nsIWeakReferenceUtils.h" +#include "MainThreadUtils.h" +#include "mozilla/Attributes.h" +#include "mozilla/EventListenerManager.h" +#include "mozilla/dom/EventTarget.h" + +struct JSCompartment; +class nsIDocument; + +namespace mozilla { + +class ErrorResult; + +#define NS_DOMEVENTTARGETHELPER_IID \ +{ 0xa28385c6, 0x9451, 0x4d7e, \ + { 0xa3, 0xdd, 0xf4, 0xb6, 0x87, 0x2f, 0xa4, 0x76 } } + +class DOMEventTargetHelper : public dom::EventTarget +{ +public: + DOMEventTargetHelper() + : mParentObject(nullptr) + , mOwnerWindow(nullptr) + , mHasOrHasHadOwnerWindow(false) + { + } + explicit DOMEventTargetHelper(nsPIDOMWindowInner* aWindow) + : mParentObject(nullptr) + , mOwnerWindow(nullptr) + , mHasOrHasHadOwnerWindow(false) + { + BindToOwner(aWindow); + } + explicit DOMEventTargetHelper(nsIGlobalObject* aGlobalObject) + : mParentObject(nullptr) + , mOwnerWindow(nullptr) + , mHasOrHasHadOwnerWindow(false) + { + BindToOwner(aGlobalObject); + } + explicit DOMEventTargetHelper(DOMEventTargetHelper* aOther) + : mParentObject(nullptr) + , mOwnerWindow(nullptr) + , mHasOrHasHadOwnerWindow(false) + { + BindToOwner(aOther); + } + + NS_DECL_CYCLE_COLLECTING_ISUPPORTS + NS_DECL_CYCLE_COLLECTION_SKIPPABLE_SCRIPT_HOLDER_CLASS(DOMEventTargetHelper) + + NS_DECL_NSIDOMEVENTTARGET + + virtual EventListenerManager* GetExistingListenerManager() const override; + virtual EventListenerManager* GetOrCreateListenerManager() override; + + using dom::EventTarget::RemoveEventListener; + virtual void AddEventListener(const nsAString& aType, + dom::EventListener* aListener, + const dom::AddEventListenerOptionsOrBoolean& aOptions, + const dom::Nullable<bool>& aWantsUntrusted, + ErrorResult& aRv) override; + + NS_DECLARE_STATIC_IID_ACCESSOR(NS_DOMEVENTTARGETHELPER_IID) + + void GetParentObject(nsIScriptGlobalObject **aParentObject) + { + if (mParentObject) { + CallQueryInterface(mParentObject, aParentObject); + } else { + *aParentObject = nullptr; + } + } + + static DOMEventTargetHelper* FromSupports(nsISupports* aSupports) + { + dom::EventTarget* target = static_cast<dom::EventTarget*>(aSupports); +#ifdef DEBUG + { + nsCOMPtr<dom::EventTarget> target_qi = do_QueryInterface(aSupports); + + // If this assertion fires the QI implementation for the object in + // question doesn't use the EventTarget pointer as the + // nsISupports pointer. That must be fixed, or we'll crash... + NS_ASSERTION(target_qi == target, "Uh, fix QI!"); + } +#endif + + return static_cast<DOMEventTargetHelper*>(target); + } + + bool HasListenersFor(const nsAString& aType) + { + return mListenerManager && mListenerManager->HasListenersFor(aType); + } + + bool HasListenersFor(nsIAtom* aTypeWithOn) + { + return mListenerManager && mListenerManager->HasListenersFor(aTypeWithOn); + } + + nsresult SetEventHandler(nsIAtom* aType, + JSContext* aCx, + const JS::Value& aValue); + using dom::EventTarget::SetEventHandler; + void GetEventHandler(nsIAtom* aType, + JSContext* aCx, + JS::Value* aValue); + using dom::EventTarget::GetEventHandler; + virtual nsPIDOMWindowOuter* GetOwnerGlobalForBindings() override + { + return nsPIDOMWindowOuter::GetFromCurrentInner(GetOwner()); + } + + nsresult CheckInnerWindowCorrectness() const + { + NS_ENSURE_STATE(!mHasOrHasHadOwnerWindow || mOwnerWindow); + if (mOwnerWindow && !mOwnerWindow->IsCurrentInnerWindow()) { + return NS_ERROR_FAILURE; + } + return NS_OK; + } + + nsPIDOMWindowInner* GetOwner() const { return mOwnerWindow; } + // Like GetOwner, but only returns non-null if the window being returned is + // current (in the "current document" sense of the HTML spec). + nsPIDOMWindowInner* GetWindowIfCurrent() const; + // Returns the document associated with this event target, if that document is + // the current document of its browsing context. Will return null otherwise. + nsIDocument* GetDocumentIfCurrent() const; + void BindToOwner(nsIGlobalObject* aOwner); + void BindToOwner(nsPIDOMWindowInner* aOwner); + void BindToOwner(DOMEventTargetHelper* aOther); + virtual void DisconnectFromOwner(); + nsIGlobalObject* GetParentObject() const + { + return GetOwnerGlobal(); + } + virtual nsIGlobalObject* GetOwnerGlobal() const override + { + nsCOMPtr<nsIGlobalObject> parentObject = do_QueryReferent(mParentObject); + return parentObject; + } + bool HasOrHasHadOwner() { return mHasOrHasHadOwnerWindow; } + + virtual void EventListenerAdded(nsIAtom* aType) override; + virtual void EventListenerRemoved(nsIAtom* aType) override; + virtual void EventListenerWasAdded(const nsAString& aType, + ErrorResult& aRv, + JSCompartment* aCompartment = nullptr) {} + virtual void EventListenerWasRemoved(const nsAString& aType, + ErrorResult& aRv, + JSCompartment* aCompartment = nullptr) {} + + // Dispatch a trusted, non-cancellable and non-bubbling event to |this|. + nsresult DispatchTrustedEvent(const nsAString& aEventName); +protected: + virtual ~DOMEventTargetHelper(); + + nsresult WantsUntrusted(bool* aRetVal); + + // If this method returns true your object is kept alive until it returns + // false. You can use this method instead using + // NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_BEGIN macro. + virtual bool IsCertainlyAliveForCC() const + { + return false; + } + + RefPtr<EventListenerManager> mListenerManager; + // Make |event| trusted and dispatch |aEvent| to |this|. + nsresult DispatchTrustedEvent(nsIDOMEvent* aEvent); + + virtual void LastRelease() {} +private: + // Inner window or sandbox. + nsWeakPtr mParentObject; + // mParentObject pre QI-ed and cached (inner window) + // (it is needed for off main thread access) + // It is obtained in BindToOwner and reset in DisconnectFromOwner. + nsPIDOMWindowInner* MOZ_NON_OWNING_REF mOwnerWindow; + bool mHasOrHasHadOwnerWindow; +}; + +NS_DEFINE_STATIC_IID_ACCESSOR(DOMEventTargetHelper, + NS_DOMEVENTTARGETHELPER_IID) + +} // namespace mozilla + +// XPIDL event handlers +#define NS_IMPL_EVENT_HANDLER(_class, _event) \ + NS_IMETHODIMP _class::GetOn##_event(JSContext* aCx, \ + JS::MutableHandle<JS::Value> aValue) \ + { \ + GetEventHandler(nsGkAtoms::on##_event, aCx, aValue.address()); \ + return NS_OK; \ + } \ + NS_IMETHODIMP _class::SetOn##_event(JSContext* aCx, \ + JS::Handle<JS::Value> aValue) \ + { \ + return SetEventHandler(nsGkAtoms::on##_event, aCx, aValue); \ + } + +#define NS_IMPL_FORWARD_EVENT_HANDLER(_class, _event, _baseclass) \ + NS_IMETHODIMP _class::GetOn##_event(JSContext* aCx, \ + JS::MutableHandle<JS::Value> aValue) \ + { \ + return _baseclass::GetOn##_event(aCx, aValue); \ + } \ + NS_IMETHODIMP _class::SetOn##_event(JSContext* aCx, \ + JS::Handle<JS::Value> aValue) \ + { \ + return _baseclass::SetOn##_event(aCx, aValue); \ + } + +// WebIDL event handlers +#define IMPL_EVENT_HANDLER(_event) \ + inline mozilla::dom::EventHandlerNonNull* GetOn##_event() \ + { \ + if (NS_IsMainThread()) { \ + return GetEventHandler(nsGkAtoms::on##_event, EmptyString()); \ + } \ + return GetEventHandler(nullptr, NS_LITERAL_STRING(#_event)); \ + } \ + inline void SetOn##_event(mozilla::dom::EventHandlerNonNull* aCallback) \ + { \ + if (NS_IsMainThread()) { \ + SetEventHandler(nsGkAtoms::on##_event, EmptyString(), aCallback); \ + } else { \ + SetEventHandler(nullptr, NS_LITERAL_STRING(#_event), aCallback); \ + } \ + } + +/* Use this macro to declare functions that forward the behavior of this + * interface to another object. + * This macro doesn't forward PreHandleEvent because sometimes subclasses + * want to override it. + */ +#define NS_FORWARD_NSIDOMEVENTTARGET_NOPREHANDLEEVENT(_to) \ + NS_IMETHOD AddEventListener(const nsAString & type, nsIDOMEventListener *listener, bool useCapture, bool wantsUntrusted, uint8_t _argc) { \ + return _to AddEventListener(type, listener, useCapture, wantsUntrusted, _argc); \ + } \ + NS_IMETHOD AddSystemEventListener(const nsAString & type, nsIDOMEventListener *listener, bool aUseCapture, bool aWantsUntrusted, uint8_t _argc) { \ + return _to AddSystemEventListener(type, listener, aUseCapture, aWantsUntrusted, _argc); \ + } \ + NS_IMETHOD RemoveEventListener(const nsAString & type, nsIDOMEventListener *listener, bool useCapture) { \ + return _to RemoveEventListener(type, listener, useCapture); \ + } \ + NS_IMETHOD RemoveSystemEventListener(const nsAString & type, nsIDOMEventListener *listener, bool aUseCapture) { \ + return _to RemoveSystemEventListener(type, listener, aUseCapture); \ + } \ + NS_IMETHOD DispatchEvent(nsIDOMEvent *evt, bool *_retval) { \ + return _to DispatchEvent(evt, _retval); \ + } \ + virtual mozilla::dom::EventTarget* GetTargetForDOMEvent() { \ + return _to GetTargetForDOMEvent(); \ + } \ + virtual mozilla::dom::EventTarget* GetTargetForEventTargetChain() { \ + return _to GetTargetForEventTargetChain(); \ + } \ + virtual nsresult WillHandleEvent( \ + mozilla::EventChainPostVisitor & aVisitor) { \ + return _to WillHandleEvent(aVisitor); \ + } \ + virtual nsresult PostHandleEvent( \ + mozilla::EventChainPostVisitor & aVisitor) { \ + return _to PostHandleEvent(aVisitor); \ + } \ + virtual nsresult DispatchDOMEvent(mozilla::WidgetEvent* aEvent, nsIDOMEvent* aDOMEvent, nsPresContext* aPresContext, nsEventStatus* aEventStatus) { \ + return _to DispatchDOMEvent(aEvent, aDOMEvent, aPresContext, aEventStatus); \ + } \ + virtual mozilla::EventListenerManager* GetOrCreateListenerManager() { \ + return _to GetOrCreateListenerManager(); \ + } \ + virtual mozilla::EventListenerManager* GetExistingListenerManager() const { \ + return _to GetExistingListenerManager(); \ + } \ + virtual nsIScriptContext * GetContextForEventHandlers(nsresult *aRv) { \ + return _to GetContextForEventHandlers(aRv); \ + } + +#define NS_REALLY_FORWARD_NSIDOMEVENTTARGET(_class) \ + using _class::AddEventListener; \ + using _class::RemoveEventListener; \ + NS_FORWARD_NSIDOMEVENTTARGET(_class::) \ + virtual mozilla::EventListenerManager* \ + GetOrCreateListenerManager() override { \ + return _class::GetOrCreateListenerManager(); \ + } \ + virtual mozilla::EventListenerManager* \ + GetExistingListenerManager() const override { \ + return _class::GetExistingListenerManager(); \ + } + +#endif // mozilla_DOMEventTargetHelper_h_ |