Event.h
/* -*- 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_dom_Event_h_
#define mozilla_dom_Event_h_
#include "mozilla/Attributes.h"
#include "mozilla/BasicEvents.h"
#include "nsIDOMEvent.h"
#include "nsISupports.h"
#include "nsCOMPtr.h"
#include "nsPIDOMWindow.h"
#include "nsPoint.h"
#include "nsCycleCollectionParticipant.h"
#include "nsAutoPtr.h"
#include "mozilla/dom/EventBinding.h"
#include "nsIScriptGlobalObject.h"
#include "Units.h"
#include "js/TypeDecls.h"
#include "nsIGlobalObject.h"
class nsIContent;
class nsIDOMEventTarget;
class nsPresContext;
namespace mozilla {
namespace dom {
class EventTarget;
class EventMessageAutoOverride;
class WantsPopupControlCheck;
#define GENERATED_EVENT(EventClass_) class EventClass_;
#include "mozilla/dom/GeneratedEventList.h"
#undef GENERATED_EVENT
// ExtendableEvent is a ServiceWorker event that is not
// autogenerated since it has some extra methods.
namespace workers {
class ExtendableEvent;
} // namespace workers
// Dummy class so we can cast through it to get from nsISupports to
// Event subclasses with only two non-ambiguous static casts.
class EventBase : public nsIDOMEvent
{
};
class Event : public EventBase,
public nsWrapperCache
{
public:
Event(EventTarget* aOwner,
nsPresContext* aPresContext,
WidgetEvent* aEvent);
explicit Event(nsPIDOMWindowInner* aWindow);
protected:
virtual ~Event();
private:
void ConstructorInit(EventTarget* aOwner,
nsPresContext* aPresContext,
WidgetEvent* aEvent);
public:
static Event* FromSupports(nsISupports* aSupports)
{
nsIDOMEvent* event =
static_cast<nsIDOMEvent*>(aSupports);
#ifdef DEBUG
{
nsCOMPtr<nsIDOMEvent> target_qi =
do_QueryInterface(aSupports);
// If this assertion fires the QI implementation for the object in
// question doesn't use the nsIDOMEvent pointer as the
// nsISupports pointer. That must be fixed, or we'll crash...
MOZ_ASSERT(target_qi == event, "Uh, fix QI!");
}
#endif
return static_cast<Event*>(event);
}
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(Event)
nsIGlobalObject* GetParentObject()
{
return mOwner;
}
virtual JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override final;
virtual JSObject* WrapObjectInternal(JSContext* aCx, JS::Handle<JSObject*> aGivenProto);
#define GENERATED_EVENT(EventClass_) \
virtual EventClass_* As##EventClass_() \
{ \
return nullptr; \
}
#include "mozilla/dom/GeneratedEventList.h"
#undef GENERATED_EVENT
// ExtendableEvent is a ServiceWorker event that is not
// autogenerated since it has some extra methods.
virtual workers::ExtendableEvent* AsExtendableEvent()
{
return nullptr;
}
// nsIDOMEvent Interface
NS_DECL_NSIDOMEVENT
void InitPresContextData(nsPresContext* aPresContext);
// Returns true if the event should be trusted.
bool Init(EventTarget* aGlobal);
static PopupControlState GetEventPopupControlState(WidgetEvent* aEvent,
nsIDOMEvent* aDOMEvent = nullptr);
static void PopupAllowedEventsChanged();
static void Shutdown();
static const char* GetEventName(EventMessage aEventType);
static CSSIntPoint GetClientCoords(nsPresContext* aPresContext,
WidgetEvent* aEvent,
LayoutDeviceIntPoint aPoint,
CSSIntPoint aDefaultPoint);
static CSSIntPoint GetPageCoords(nsPresContext* aPresContext,
WidgetEvent* aEvent,
LayoutDeviceIntPoint aPoint,
CSSIntPoint aDefaultPoint);
static CSSIntPoint GetScreenCoords(nsPresContext* aPresContext,
WidgetEvent* aEvent,
LayoutDeviceIntPoint aPoint);
static CSSIntPoint GetOffsetCoords(nsPresContext* aPresContext,
WidgetEvent* aEvent,
LayoutDeviceIntPoint aPoint,
CSSIntPoint aDefaultPoint);
static already_AddRefed<Event> Constructor(const GlobalObject& aGlobal,
const nsAString& aType,
const EventInit& aParam,
ErrorResult& aRv);
// Implemented as xpidl method
// void GetType(nsString& aRetval) {}
EventTarget* GetTarget() const;
EventTarget* GetCurrentTarget() const;
uint16_t EventPhase() const;
// xpidl implementation
// void StopPropagation();
// xpidl implementation
// void StopImmediatePropagation();
bool Bubbles() const
{
return mEvent->mFlags.mBubbles;
}
bool Cancelable() const
{
return mEvent->mFlags.mCancelable;
}
// xpidl implementation
// void PreventDefault();
// You MUST NOT call PreventDefaultJ(JSContext*) from C++ code. A call of
// this method always sets Event.defaultPrevented true for web contents.
// If default action handler calls this, web applications meet wrong
// defaultPrevented value.
virtual void PreventDefault(JSContext* aCx);
// You MUST NOT call DefaultPrevented(JSContext*) from C++ code. This may
// return false even if PreventDefault() has been called.
// See comments in its implementation for the detail.
bool DefaultPrevented(JSContext* aCx) const;
bool DefaultPrevented() const
{
return mEvent->DefaultPrevented();
}
bool DefaultPreventedByChrome() const
{
return mEvent->mFlags.mDefaultPreventedByChrome;
}
bool DefaultPreventedByContent() const
{
return mEvent->mFlags.mDefaultPreventedByContent;
}
bool MultipleActionsPrevented() const
{
return mEvent->mFlags.mMultipleActionsPrevented;
}
bool IsTrusted() const
{
return mEvent->IsTrusted();
}
bool IsSynthesized() const
{
return mEvent->mFlags.mIsSynthesizedForTests;
}
double TimeStamp() const;
EventTarget* GetOriginalTarget() const;
EventTarget* GetExplicitOriginalTarget() const;
EventTarget* GetComposedTarget() const;
bool GetPreventDefault() const;
/**
* @param aCalledByDefaultHandler Should be true when this is called by
* C++ or Chrome. Otherwise, e.g., called
* by a call of Event.preventDefault() in
* content script, false.
*/
void PreventDefaultInternal(bool aCalledByDefaultHandler);
bool IsMainThreadEvent()
{
return mIsMainThreadEvent;
}
/**
* For a given current target, returns the related target adjusted with
* shadow DOM retargeting rules. Returns nullptr if related target
* is not adjusted.
*/
static nsIContent* GetShadowRelatedTarget(nsIContent* aCurrentTarget,
nsIContent* aRelatedTarget);
protected:
// Internal helper functions
void SetEventType(const nsAString& aEventTypeArg);
already_AddRefed<nsIContent> GetTargetFromFrame();
friend class EventMessageAutoOverride;
friend class WantsPopupControlCheck;
void SetWantsPopupControlCheck(bool aCheck)
{
mWantsPopupControlCheck = aCheck;
}
bool GetWantsPopupControlCheck()
{
return IsTrusted() && mWantsPopupControlCheck;
}
/**
* IsChrome() returns true if aCx is chrome context or the event is created
* in chrome's thread. Otherwise, false.
*/
bool IsChrome(JSContext* aCx) const;
mozilla::WidgetEvent* mEvent;
RefPtr<nsPresContext> mPresContext;
nsCOMPtr<EventTarget> mExplicitOriginalTarget;
nsCOMPtr<nsIGlobalObject> mOwner;
bool mEventIsInternal;
bool mPrivateDataDuplicated;
bool mIsMainThreadEvent;
// True when popup control check should rely on event.type, not
// WidgetEvent.mMessage.
bool mWantsPopupControlCheck;
};
/**
* RAII helper-class to override an event's message (i.e. its DOM-exposed
* type), for as long as the object is alive. Restores the original
* EventMessage when destructed.
*
* Notable requirements:
* - The original & overriding messages must be known (not eUnidentifiedEvent).
* - The original & overriding messages must be different.
* - The passed-in nsIDOMEvent must outlive this RAII helper.
*/
class MOZ_RAII EventMessageAutoOverride
{
public:
explicit EventMessageAutoOverride(nsIDOMEvent* aEvent,
EventMessage aOverridingMessage)
: mEvent(aEvent->InternalDOMEvent()),
mOrigMessage(mEvent->mEvent->mMessage)
{
MOZ_ASSERT(aOverridingMessage != mOrigMessage,
"Don't use this class if you're not actually overriding");
MOZ_ASSERT(aOverridingMessage != eUnidentifiedEvent,
"Only use this class with a valid overriding EventMessage");
MOZ_ASSERT(mOrigMessage != eUnidentifiedEvent &&
mEvent->mEvent->mSpecifiedEventTypeString.IsEmpty(),
"Only use this class on events whose overridden type is "
"known (so we can restore it properly)");
mEvent->mEvent->mMessage = aOverridingMessage;
}
~EventMessageAutoOverride()
{
mEvent->mEvent->mMessage = mOrigMessage;
}
protected:
// Non-owning ref, which should be safe since we're a stack-allocated object
// with limited lifetime. Whoever creates us should keep mEvent alive.
Event* const MOZ_NON_OWNING_REF mEvent;
const EventMessage mOrigMessage;
};
class MOZ_STACK_CLASS WantsPopupControlCheck
{
public:
explicit WantsPopupControlCheck(nsIDOMEvent* aEvent) :
mEvent(aEvent->InternalDOMEvent())
{
mOriginalWantsPopupControlCheck = mEvent->GetWantsPopupControlCheck();
mEvent->SetWantsPopupControlCheck(mEvent->IsTrusted());
}
~WantsPopupControlCheck()
{
mEvent->SetWantsPopupControlCheck(mOriginalWantsPopupControlCheck);
}
private:
Event* mEvent;
bool mOriginalWantsPopupControlCheck;
};
} // namespace dom
} // namespace mozilla
#define NS_FORWARD_TO_EVENT \
NS_FORWARD_NSIDOMEVENT(Event::) \
virtual void PreventDefault(JSContext* aCx) override { Event::PreventDefault(aCx); }
#define NS_FORWARD_NSIDOMEVENT_NO_SERIALIZATION_NO_DUPLICATION(_to) \
NS_IMETHOD GetType(nsAString& aType) override { return _to GetType(aType); } \
NS_IMETHOD GetTarget(nsIDOMEventTarget** aTarget) override { return _to GetTarget(aTarget); } \
NS_IMETHOD GetCurrentTarget(nsIDOMEventTarget** aCurrentTarget) override { return _to GetCurrentTarget(aCurrentTarget); } \
NS_IMETHOD GetEventPhase(uint16_t* aEventPhase) override { return _to GetEventPhase(aEventPhase); } \
NS_IMETHOD GetBubbles(bool* aBubbles) override { return _to GetBubbles(aBubbles); } \
NS_IMETHOD GetCancelable(bool* aCancelable) override { return _to GetCancelable(aCancelable); } \
NS_IMETHOD GetTimeStamp(DOMTimeStamp* aTimeStamp) override { return _to GetTimeStamp(aTimeStamp); } \
NS_IMETHOD StopPropagation(void) override { return _to StopPropagation(); } \
NS_IMETHOD StopCrossProcessForwarding(void) override { return _to StopCrossProcessForwarding(); } \
NS_IMETHOD PreventDefault(void) override { return _to PreventDefault(); } \
void InitEvent(const nsAString& eventTypeArg, bool canBubbleArg, bool cancelableArg) override { _to InitEvent(eventTypeArg, canBubbleArg, cancelableArg); } \
NS_IMETHOD GetDefaultPrevented(bool* aDefaultPrevented) override { return _to GetDefaultPrevented(aDefaultPrevented); } \
NS_IMETHOD StopImmediatePropagation(void) override { return _to StopImmediatePropagation(); } \
NS_IMETHOD GetOriginalTarget(nsIDOMEventTarget** aOriginalTarget) override { return _to GetOriginalTarget(aOriginalTarget); } \
NS_IMETHOD GetExplicitOriginalTarget(nsIDOMEventTarget** aExplicitOriginalTarget) override { return _to GetExplicitOriginalTarget(aExplicitOriginalTarget); } \
NS_IMETHOD GetPreventDefault(bool* aRetval) override { return _to GetPreventDefault(aRetval); } \
NS_IMETHOD GetIsTrusted(bool* aIsTrusted) override { return _to GetIsTrusted(aIsTrusted); } \
NS_IMETHOD SetTarget(nsIDOMEventTarget* aTarget) override { return _to SetTarget(aTarget); } \
NS_IMETHOD_(bool) IsDispatchStopped(void) override { return _to IsDispatchStopped(); } \
NS_IMETHOD_(WidgetEvent*) WidgetEventPtr(void) override { return _to WidgetEventPtr(); } \
NS_IMETHOD_(void) SetTrusted(bool aTrusted) override { _to SetTrusted(aTrusted); } \
NS_IMETHOD_(void) SetOwner(EventTarget* aOwner) override { _to SetOwner(aOwner); } \
NS_IMETHOD_(Event*) InternalDOMEvent() override { return _to InternalDOMEvent(); }
#define NS_FORWARD_TO_EVENT_NO_SERIALIZATION_NO_DUPLICATION \
NS_FORWARD_NSIDOMEVENT_NO_SERIALIZATION_NO_DUPLICATION(Event::) \
virtual void PreventDefault(JSContext* aCx) override { Event::PreventDefault(aCx); }
inline nsISupports*
ToSupports(mozilla::dom::Event* e)
{
return static_cast<nsIDOMEvent*>(e);
}
inline nsISupports*
ToCanonicalSupports(mozilla::dom::Event* e)
{
return static_cast<nsIDOMEvent*>(e);
}
already_AddRefed<mozilla::dom::Event>
NS_NewDOMEvent(mozilla::dom::EventTarget* aOwner,
nsPresContext* aPresContext,
mozilla::WidgetEvent* aEvent);
#endif // mozilla_dom_Event_h_
