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gecko-dev/widget/BasicEvents.h
Masayuki Nakano 151b00226e Bug 1793267 - Make PostEventHandler::CheckPointerCaptureState synthesize ePointerMove and eMouseMove if nobody captures the pointer anymore r=smaug 
When an element starts capturing a pointer, pointer/mouse boundary events are
dispatched by `EventStateManager::PreHandleEvent` [1].  However, when the
capturing element loses the capture, they are not dispatched.

When the pointer capture is implicitly released, the pointer may be over another
document.  Therefore, this patch synthesizes an internal `ePointerMove` and
`eMouseMove` on the widget to make `PresShell::HandleEvent` redirects the event
to proper document under the pointer.

Unfortunately, I add 2 manual tests into WPT.  The reason is, a drag operation
across document boundary with test driver does not work even if I specify the
pointer position within the parent document coordinates.  This is same both on
Firefox and Chrome.  Additionally, writing the new tests as a mochitest won't
work too.  If I use synthesized mouse events, I see similar failure.
Additionally, when I use native events, it works, but unstable to run on CI.

1. https://searchfox.org/mozilla-central/rev/669fac9888b173c02baa4c036e980c0c204dfe02/dom/events/EventStateManager.cpp#1139-1140

Differential Revision: https://phabricator.services.mozilla.com/D218896
2024-08-20 03:42:26 +00:00

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/* -*- 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 mozilla_BasicEvents_h__
#define mozilla_BasicEvents_h__
#include <stdint.h>
#include <type_traits>
#include "mozilla/EventForwards.h"
#include "mozilla/TimeStamp.h"
#include "mozilla/dom/EventTarget.h"
#include "mozilla/layers/LayersTypes.h"
#include "nsCOMPtr.h"
#include "nsAtom.h"
#include "nsISupportsImpl.h"
#include "nsIWidget.h"
#include "nsString.h"
#include "Units.h"
#ifdef DEBUG
# include "nsXULAppAPI.h"
#endif // #ifdef DEBUG
class nsIPrincipal;
namespace IPC {
template <typename T>
struct ParamTraits;
} // namespace IPC
namespace mozilla {
class EventTargetChainItem;
enum class CrossProcessForwarding {
// eStop prevents the event to be sent to remote process.
eStop,
// eAllow keeps current state of the event whether it's sent to remote
// process. In other words, eAllow does NOT mean that making the event
// sent to remote process when IsCrossProcessForwardingStopped() returns
// true.
eAllow,
};
/******************************************************************************
* mozilla::BaseEventFlags
*
* BaseEventFlags must be a POD struct for safe to use memcpy (including
* in ParamTraits<BaseEventFlags>). So don't make virtual methods, constructor,
* destructor and operators.
* This is necessary for VC which is NOT C++0x compiler.
******************************************************************************/
struct BaseEventFlags {
public:
// If mIsTrusted is true, the event is a trusted event. Otherwise, it's
// an untrusted event.
bool mIsTrusted : 1;
// If mInBubblingPhase is true, the event is in bubbling phase or target
// phase.
bool mInBubblingPhase : 1;
// If mInCapturePhase is true, the event is in capture phase or target phase.
bool mInCapturePhase : 1;
// If mInTargetPhase is true, the event is in target phase.
bool mInTargetPhase : 1;
// If mInSystemGroup is true, the event is being dispatched in system group.
bool mInSystemGroup : 1;
// If mCancelable is true, the event can be consumed. I.e., calling
// dom::Event::PreventDefault() can prevent the default action.
bool mCancelable : 1;
// If mBubbles is true, the event can bubble. Otherwise, cannot be handled
// in bubbling phase.
bool mBubbles : 1;
// If mPropagationStopped is true, dom::Event::StopPropagation() or
// dom::Event::StopImmediatePropagation() has been called.
bool mPropagationStopped : 1;
// If mImmediatePropagationStopped is true,
// dom::Event::StopImmediatePropagation() has been called.
// Note that mPropagationStopped must be true when this is true.
bool mImmediatePropagationStopped : 1;
// If mDefaultPrevented is true, the event has been consumed.
// E.g., dom::Event::PreventDefault() has been called or
// the default action has been performed.
bool mDefaultPrevented : 1;
// If mDefaultPreventedByContent is true, the event has been
// consumed by content.
// Note that mDefaultPrevented must be true when this is true.
bool mDefaultPreventedByContent : 1;
// If mDefaultPreventedByChrome is true, the event has been
// consumed by chrome.
// Note that mDefaultPrevented must be true when this is true.
bool mDefaultPreventedByChrome : 1;
// mMultipleActionsPrevented may be used when default handling don't want to
// be prevented, but only one of the event targets should handle the event.
// For example, when a <label> element is in another <label> element and
// the first <label> element is clicked, that one may set this true.
// Then, the second <label> element won't handle the event.
bool mMultipleActionsPrevented : 1;
// If mIsBeingDispatched is true, the DOM event created from the event is
// dispatching into the DOM tree and not completed.
bool mIsBeingDispatched : 1;
// If mDispatchedAtLeastOnce is true, the event has been dispatched
// as a DOM event and the dispatch has been completed in the process.
// So, this is false even if the event has already been dispatched
// in another process.
bool mDispatchedAtLeastOnce : 1;
// If mIsSynthesizedForTests is true, the event has been synthesized for
// automated tests or something hacky approach of an add-on.
bool mIsSynthesizedForTests : 1;
// If mExceptionWasRaised is true, one of the event handlers has raised an
// exception.
bool mExceptionWasRaised : 1;
// If mRetargetToNonNativeAnonymous is true and the target is in a non-native
// native anonymous subtree, the event target is set to mOriginalTarget.
bool mRetargetToNonNativeAnonymous : 1;
// If mNoContentDispatch is true, the event is never dispatched to the
// event handlers which are added to the contents, onfoo attributes and
// properties. Note that this flag is ignored when
// EventChainPreVisitor::mForceContentDispatch is set true. For exapmle,
// window and document object sets it true. Therefore, web applications
// can handle the event if they add event listeners to the window or the
// document.
// XXX This is an ancient and broken feature, don't use this for new bug
// as far as possible.
bool mNoContentDispatch : 1;
// If mOnlyChromeDispatch is true, the event is dispatched to only chrome.
bool mOnlyChromeDispatch : 1;
// Indicates if the key combination is reserved by chrome. This is set by
// MarkAsReservedByChrome().
bool mIsReservedByChrome : 1;
// If mOnlySystemGroupDispatchInContent is true, event listeners added to
// the default group for non-chrome EventTarget won't be called.
// Be aware, if this is true, EventDispatcher needs to check if each event
// listener is added to chrome node, so, don't set this to true for the
// events which are fired a lot of times like eMouseMove.
bool mOnlySystemGroupDispatchInContent : 1;
// If mOnlySystemGroupDispatch is true, the event will be dispatched only to
// event listeners added in the system group.
bool mOnlySystemGroupDispatch : 1;
// The event's action will be handled by APZ. The main thread should not
// perform its associated action.
bool mHandledByAPZ : 1;
// True if the event is currently being handled by an event listener that
// was registered as a passive listener.
bool mInPassiveListener : 1;
// If mComposed is true, the event fired by nodes in shadow DOM can cross the
// boundary of shadow DOM and light DOM.
bool mComposed : 1;
// Similar to mComposed. Set it to true to allow events cross the boundary
// between native non-anonymous content and native anonymouse content
bool mComposedInNativeAnonymousContent : 1;
// Set to true for events which are suppressed or delayed so that later a
// DelayedEvent of it is dispatched. This is used when parent side process
// the key event after content side, and may drop the event if the event
// was suppressed or delayed in contents side.
// It is also set to true for the events (in a DelayedInputEvent), which will
// be dispatched afterwards.
bool mIsSuppressedOrDelayed : 1;
// Certain mouse events can be marked as positionless to return 0 from
// coordinate related getters.
bool mIsPositionless : 1;
// Flags managing state of propagation between processes.
// Note the the following flags shouldn't be referred directly. Use utility
// methods instead.
// If mNoRemoteProcessDispatch is true, the event is not allowed to be sent
// to remote process.
bool mNoRemoteProcessDispatch : 1;
// If mWantReplyFromContentProcess is true, the event will be redispatched
// in the parent process after the content process has handled it. Useful
// for when the parent process need the know first how the event was used
// by content before handling it itself.
bool mWantReplyFromContentProcess : 1;
// If mPostedToRemoteProcess is true, the event has been posted to the
// remote process (but it's not handled yet if it's not a duplicated event
// instance).
bool mPostedToRemoteProcess : 1;
// If mCameFromAnotherProcess is true, the event came from another process.
bool mCameFromAnotherProcess : 1;
/**
* Helper methods for methods of DOM Event.
*/
inline void StopPropagation() { mPropagationStopped = true; }
inline void StopImmediatePropagation() {
StopPropagation();
mImmediatePropagationStopped = true;
}
inline void PreventDefault(bool aCalledByDefaultHandler = true) {
if (!mCancelable) {
return;
}
mDefaultPrevented = true;
// Note that even if preventDefault() has already been called by chrome,
// a call of preventDefault() by content needs to overwrite
// mDefaultPreventedByContent to true because in such case, defaultPrevented
// must be true when web apps check it after they call preventDefault().
if (aCalledByDefaultHandler) {
StopCrossProcessForwarding();
mDefaultPreventedByChrome = true;
} else {
mDefaultPreventedByContent = true;
}
}
// This should be used only before dispatching events into the DOM tree.
inline void PreventDefaultBeforeDispatch(
CrossProcessForwarding aCrossProcessForwarding) {
if (!mCancelable) {
return;
}
mDefaultPrevented = true;
if (aCrossProcessForwarding == CrossProcessForwarding::eStop) {
StopCrossProcessForwarding();
}
}
inline bool DefaultPrevented() const { return mDefaultPrevented; }
inline bool DefaultPreventedByContent() const {
MOZ_ASSERT(!mDefaultPreventedByContent || DefaultPrevented());
return mDefaultPreventedByContent;
}
inline bool IsTrusted() const { return mIsTrusted; }
inline bool PropagationStopped() const { return mPropagationStopped; }
// Helper methods to access flags managing state of propagation between
// processes.
/**
* Prevent to be dispatched to remote process.
*/
inline void StopCrossProcessForwarding() {
MOZ_ASSERT(!mPostedToRemoteProcess);
mNoRemoteProcessDispatch = true;
mWantReplyFromContentProcess = false;
}
/**
* Return true if the event shouldn't be dispatched to remote process.
*/
inline bool IsCrossProcessForwardingStopped() const {
return mNoRemoteProcessDispatch;
}
/**
* Mark the event as waiting reply from remote process.
* If the caller needs to win other keyboard event handlers in chrome,
* the caller should call StopPropagation() too.
* Otherwise, if the caller just needs to know if the event is consumed by
* either content or chrome, it should just call this because the event
* may be reserved by chrome and it needs to be dispatched into the DOM
* tree in chrome for checking if it's reserved before being sent to any
* remote processes.
*/
inline void MarkAsWaitingReplyFromRemoteProcess() {
MOZ_ASSERT(!mPostedToRemoteProcess);
mNoRemoteProcessDispatch = false;
mWantReplyFromContentProcess = true;
}
/**
* Reset "waiting reply from remote process" state. This is useful when
* you dispatch a copy of an event coming from different process.
*/
inline void ResetWaitingReplyFromRemoteProcessState() {
if (IsWaitingReplyFromRemoteProcess()) {
// FYI: mWantReplyFromContentProcess is also used for indicating
// "handled in remote process" state. Therefore, only when
// IsWaitingReplyFromRemoteProcess() returns true, this should
// reset the flag.
mWantReplyFromContentProcess = false;
}
}
/**
* Return true if the event handler should wait reply event. I.e., if this
* returns true, any event handler should do nothing with the event.
*/
inline bool IsWaitingReplyFromRemoteProcess() const {
return !mNoRemoteProcessDispatch && mWantReplyFromContentProcess;
}
/**
* Mark the event as already handled in the remote process. This should be
* called when initializing reply events.
*/
inline void MarkAsHandledInRemoteProcess() {
mNoRemoteProcessDispatch = true;
mWantReplyFromContentProcess = true;
mPostedToRemoteProcess = false;
}
/**
* Return true if the event has already been handled in the remote process.
*/
inline bool IsHandledInRemoteProcess() const {
return mNoRemoteProcessDispatch && mWantReplyFromContentProcess;
}
/**
* Return true if the event should be sent back to its parent process.
*/
inline bool WantReplyFromContentProcess() const {
MOZ_ASSERT(!XRE_IsParentProcess());
return IsWaitingReplyFromRemoteProcess();
}
/**
* Mark the event has already posted to a remote process.
*/
inline void MarkAsPostedToRemoteProcess() {
MOZ_ASSERT(!IsCrossProcessForwardingStopped());
mPostedToRemoteProcess = true;
}
/**
* Reset the cross process dispatching state. This should be used when a
* process receives the event because the state is in the sender.
*/
inline void ResetCrossProcessDispatchingState() {
MOZ_ASSERT(!IsCrossProcessForwardingStopped());
mPostedToRemoteProcess = false;
// Ignore propagation state in the remote process if it's marked as
// "waiting reply from remote process" because the process needs to
// stop propagation in the process until receiving a reply event.
// Note that the propagation stopped flag is important for the reply event
// handler in the main process because it's used for making whether it's
// ignored by the remote process or not.
if (!XRE_IsParentProcess() && IsWaitingReplyFromRemoteProcess()) {
mPropagationStopped = mImmediatePropagationStopped = false;
}
// mDispatchedAtLeastOnce indicates the state in current process.
mDispatchedAtLeastOnce = false;
}
/**
* Return true if the event has been posted to a remote process.
* Note that MarkAsPostedToRemoteProcess() is called by
* ParamTraits<mozilla::WidgetEvent>. Therefore, it *might* be possible
* that posting the event failed even if this returns true. But that must
* really rare. If that'd be problem for you, you should unmark this in
* BrowserParent or somewhere.
*/
inline bool HasBeenPostedToRemoteProcess() const {
return mPostedToRemoteProcess;
}
/**
* Return true if the event came from another process.
*/
inline bool CameFromAnotherProcess() const { return mCameFromAnotherProcess; }
/**
* Mark the event as coming from another process.
*/
inline void MarkAsComingFromAnotherProcess() {
mCameFromAnotherProcess = true;
}
/**
* Mark the event is reserved by chrome. I.e., shouldn't be dispatched to
* content because it shouldn't be cancelable.
*/
inline void MarkAsReservedByChrome() {
MOZ_ASSERT(!mPostedToRemoteProcess);
mIsReservedByChrome = true;
// For reserved commands (such as Open New Tab), we don't need to wait for
// the content to answer, neither to give a chance for content to override
// its behavior.
StopCrossProcessForwarding();
// If the event is reserved by chrome, we shouldn't expose the event to
// web contents because such events shouldn't be cancelable. So, it's not
// good behavior to fire such events but to ignore the defaultPrevented
// attribute value in chrome.
mOnlySystemGroupDispatchInContent = true;
}
/**
* Return true if the event is reserved by chrome.
*/
inline bool IsReservedByChrome() const {
MOZ_ASSERT(!mIsReservedByChrome || (IsCrossProcessForwardingStopped() &&
mOnlySystemGroupDispatchInContent));
return mIsReservedByChrome;
}
inline void Clear() { SetRawFlags(0); }
// Get if either the instance's bit or the aOther's bit is true, the
// instance's bit becomes true. In other words, this works like:
// eventFlags |= aOther;
inline void Union(const BaseEventFlags& aOther) {
RawFlags rawFlags = GetRawFlags() | aOther.GetRawFlags();
SetRawFlags(rawFlags);
}
private:
typedef uint64_t RawFlags;
inline void SetRawFlags(RawFlags aRawFlags) {
static_assert(sizeof(BaseEventFlags) <= sizeof(RawFlags),
"mozilla::EventFlags must not be bigger than the RawFlags");
memcpy(this, &aRawFlags, sizeof(BaseEventFlags));
}
inline RawFlags GetRawFlags() const {
RawFlags result = 0;
memcpy(&result, this, sizeof(BaseEventFlags));
return result;
}
};
/******************************************************************************
* mozilla::EventFlags
******************************************************************************/
struct EventFlags : public BaseEventFlags {
EventFlags() { Clear(); }
};
/******************************************************************************
* mozilla::WidgetEventTime
******************************************************************************/
class WidgetEventTime {
public:
// Timestamp when the message was created.
TimeStamp mTimeStamp;
WidgetEventTime() : mTimeStamp(TimeStamp::Now()) {}
explicit WidgetEventTime(const WidgetEventTime* aTime)
: mTimeStamp(aTime ? aTime->mTimeStamp : TimeStamp::Now()) {
MOZ_ASSERT(aTime != this);
MOZ_ASSERT_IF(aTime, !aTime->mTimeStamp.IsNull());
}
explicit WidgetEventTime(TimeStamp aTimeStamp) : mTimeStamp(aTimeStamp) {}
void AssignEventTime(const WidgetEventTime& aOther) {
mTimeStamp = aOther.mTimeStamp;
}
};
/******************************************************************************
* mozilla::WidgetEvent
******************************************************************************/
class WidgetEvent : public WidgetEventTime {
private:
void SetDefaultCancelableAndBubbles() {
switch (mClass) {
case eEditorInputEventClass:
mFlags.mCancelable = false;
mFlags.mBubbles = mFlags.mIsTrusted;
break;
case eLegacyTextEventClass:
mFlags.mCancelable = mFlags.mIsTrusted && mMessage == eLegacyTextInput;
mFlags.mBubbles = mFlags.mIsTrusted && mMessage == eLegacyTextInput;
break;
case eMouseEventClass:
mFlags.mCancelable =
(mMessage != eMouseEnter && mMessage != eMouseLeave);
mFlags.mBubbles = (mMessage != eMouseEnter && mMessage != eMouseLeave);
break;
case ePointerEventClass:
mFlags.mCancelable =
(mMessage != ePointerEnter && mMessage != ePointerLeave &&
mMessage != ePointerCancel && mMessage != ePointerGotCapture &&
mMessage != ePointerLostCapture);
mFlags.mBubbles =
(mMessage != ePointerEnter && mMessage != ePointerLeave);
break;
case eDragEventClass:
mFlags.mCancelable = (mMessage != eDragExit && mMessage != eDragLeave &&
mMessage != eDragEnd);
mFlags.mBubbles = true;
break;
case eSMILTimeEventClass:
mFlags.mCancelable = false;
mFlags.mBubbles = false;
break;
case eTransitionEventClass:
case eAnimationEventClass:
mFlags.mCancelable = false;
mFlags.mBubbles = true;
break;
case eCompositionEventClass:
// XXX compositionstart is cancelable in draft of DOM3 Events.
// However, it doesn't make sense for us, we cannot cancel
// composition when we send compositionstart event.
mFlags.mCancelable = false;
mFlags.mBubbles = true;
break;
default:
if (mMessage == eResize || mMessage == eMozVisualResize ||
mMessage == eMozVisualScroll || mMessage == eEditorInput ||
mMessage == eFormSelect) {
mFlags.mCancelable = false;
} else {
mFlags.mCancelable = true;
}
mFlags.mBubbles = true;
break;
}
}
protected:
WidgetEvent(bool aIsTrusted, EventMessage aMessage,
EventClassID aEventClassID,
const WidgetEventTime* aTime = nullptr)
: WidgetEventTime(aTime),
mClass(aEventClassID),
mMessage(aMessage),
mRefPoint(0, 0),
mLastRefPoint(0, 0),
mFocusSequenceNumber(0),
mSpecifiedEventType(nullptr),
mPath(nullptr),
mLayersId(layers::LayersId{0}) {
MOZ_COUNT_CTOR(WidgetEvent);
mFlags.Clear();
mFlags.mIsTrusted = aIsTrusted;
SetDefaultCancelableAndBubbles();
SetDefaultComposed();
SetDefaultComposedInNativeAnonymousContent();
}
WidgetEvent() : mPath(nullptr) { MOZ_COUNT_CTOR(WidgetEvent); }
public:
WidgetEvent(bool aIsTrusted, EventMessage aMessage,
const WidgetEventTime* aTime = nullptr)
: WidgetEvent(aIsTrusted, aMessage, eBasicEventClass, aTime) {}
MOZ_COUNTED_DTOR_VIRTUAL(WidgetEvent)
WidgetEvent(const WidgetEvent& aOther) : WidgetEventTime(aOther) {
MOZ_COUNT_CTOR(WidgetEvent);
*this = aOther;
}
WidgetEvent& operator=(const WidgetEvent& aOther) = default;
WidgetEvent(WidgetEvent&& aOther)
: WidgetEventTime(std::move(aOther)),
mClass(aOther.mClass),
mMessage(aOther.mMessage),
mRefPoint(std::move(aOther.mRefPoint)),
mLastRefPoint(std::move(aOther.mLastRefPoint)),
mFocusSequenceNumber(aOther.mFocusSequenceNumber),
mFlags(std::move(aOther.mFlags)),
mSpecifiedEventType(std::move(aOther.mSpecifiedEventType)),
mSpecifiedEventTypeString(std::move(aOther.mSpecifiedEventTypeString)),
mTarget(std::move(aOther.mTarget)),
mCurrentTarget(std::move(aOther.mCurrentTarget)),
mOriginalTarget(std::move(aOther.mOriginalTarget)),
mRelatedTarget(std::move(aOther.mRelatedTarget)),
mOriginalRelatedTarget(std::move(aOther.mOriginalRelatedTarget)),
mPath(std::move(aOther.mPath)) {
MOZ_COUNT_CTOR(WidgetEvent);
}
WidgetEvent& operator=(WidgetEvent&& aOther) = default;
virtual WidgetEvent* Duplicate() const {
MOZ_ASSERT(mClass == eBasicEventClass,
"Duplicate() must be overridden by sub class");
WidgetEvent* result = new WidgetEvent(false, mMessage, this);
result->AssignEventData(*this, true);
result->mFlags = mFlags;
return result;
}
EventClassID mClass;
EventMessage mMessage;
// Relative to the widget of the event, or if there is no widget then it is
// in screen coordinates. Not modified by layout code.
// This is in visual coordinates, i.e. the correct RelativeTo value that
// expresses what this is relative to is `{viewportFrame, Visual}`, where
// `viewportFrame` is the viewport frame of the widget's root document.
LayoutDeviceIntPoint mRefPoint;
// The previous mRefPoint, if known, used to calculate mouse movement deltas.
LayoutDeviceIntPoint mLastRefPoint;
// The sequence number of the last potentially focus changing event handled
// by APZ. This is used to track when that event has been processed by
// content, and focus can be reconfirmed for async keyboard scrolling.
uint64_t mFocusSequenceNumber;
// See BaseEventFlags definition for the detail.
BaseEventFlags mFlags;
// If JS creates an event with unknown event type or known event type but
// for different event interface, the event type is stored to this.
// NOTE: This is always used if the instance is a WidgetCommandEvent instance
// or "input" event is dispatched with dom::Event class.
RefPtr<nsAtom> mSpecifiedEventType;
// nsAtom isn't available on non-main thread due to unsafe. Therefore,
// mSpecifiedEventTypeString is used instead of mSpecifiedEventType if
// the event is created in non-main thread.
nsString mSpecifiedEventTypeString;
// Event targets, needed by DOM Events
// Note that when you need event target for DOM event, you should use
// Get*DOMEventTarget() instead of accessing these members directly.
nsCOMPtr<dom::EventTarget> mTarget;
nsCOMPtr<dom::EventTarget> mCurrentTarget;
nsCOMPtr<dom::EventTarget> mOriginalTarget;
/// The possible related target
nsCOMPtr<dom::EventTarget> mRelatedTarget;
nsCOMPtr<dom::EventTarget> mOriginalRelatedTarget;
nsTArray<EventTargetChainItem>* mPath;
// The LayersId of the content process that this event should be
// dispatched to. This field is only used in the chrome process
// and doesn't get remoted to child processes.
layers::LayersId mLayersId;
dom::EventTarget* GetDOMEventTarget() const;
dom::EventTarget* GetCurrentDOMEventTarget() const;
dom::EventTarget* GetOriginalDOMEventTarget() const;
void AssignEventData(const WidgetEvent& aEvent, bool aCopyTargets) {
// mClass should be initialized with the constructor.
// mMessage should be initialized with the constructor.
mRefPoint = aEvent.mRefPoint;
// mLastRefPoint doesn't need to be copied.
mFocusSequenceNumber = aEvent.mFocusSequenceNumber;
// mLayersId intentionally not copied, since it's not used within content
AssignEventTime(aEvent);
// mFlags should be copied manually if it's necessary.
mSpecifiedEventType = aEvent.mSpecifiedEventType;
// mSpecifiedEventTypeString should be copied manually if it's necessary.
mTarget = aCopyTargets ? aEvent.mTarget : nullptr;
mCurrentTarget = aCopyTargets ? aEvent.mCurrentTarget : nullptr;
mOriginalTarget = aCopyTargets ? aEvent.mOriginalTarget : nullptr;
mRelatedTarget = aCopyTargets ? aEvent.mRelatedTarget : nullptr;
mOriginalRelatedTarget =
aCopyTargets ? aEvent.mOriginalRelatedTarget : nullptr;
}
/**
* Helper methods for methods of DOM Event.
*/
void StopPropagation() { mFlags.StopPropagation(); }
void StopImmediatePropagation() { mFlags.StopImmediatePropagation(); }
void PreventDefault(bool aCalledByDefaultHandler = true,
nsIPrincipal* aPrincipal = nullptr);
void PreventDefaultBeforeDispatch(
CrossProcessForwarding aCrossProcessForwarding) {
mFlags.PreventDefaultBeforeDispatch(aCrossProcessForwarding);
}
bool DefaultPrevented() const { return mFlags.DefaultPrevented(); }
bool DefaultPreventedByContent() const {
return mFlags.DefaultPreventedByContent();
}
bool IsTrusted() const { return mFlags.IsTrusted(); }
bool PropagationStopped() const { return mFlags.PropagationStopped(); }
/**
* Prevent to be dispatched to remote process.
*/
inline void StopCrossProcessForwarding() {
mFlags.StopCrossProcessForwarding();
}
/**
* Return true if the event shouldn't be dispatched to remote process.
*/
inline bool IsCrossProcessForwardingStopped() const {
return mFlags.IsCrossProcessForwardingStopped();
}
/**
* Mark the event as waiting reply from remote process.
* Note that this also stops immediate propagation in current process.
*/
inline void MarkAsWaitingReplyFromRemoteProcess() {
mFlags.MarkAsWaitingReplyFromRemoteProcess();
}
/**
* Reset "waiting reply from remote process" state. This is useful when
* you dispatch a copy of an event coming from different process.
*/
inline void ResetWaitingReplyFromRemoteProcessState() {
mFlags.ResetWaitingReplyFromRemoteProcessState();
}
/**
* Return true if the event handler should wait reply event. I.e., if this
* returns true, any event handler should do nothing with the event.
*/
inline bool IsWaitingReplyFromRemoteProcess() const {
return mFlags.IsWaitingReplyFromRemoteProcess();
}
/**
* Mark the event as already handled in the remote process. This should be
* called when initializing reply events.
*/
inline void MarkAsHandledInRemoteProcess() {
mFlags.MarkAsHandledInRemoteProcess();
}
/**
* Return true if the event has already been handled in the remote process.
* I.e., if this returns true, the event is a reply event.
*/
inline bool IsHandledInRemoteProcess() const {
return mFlags.IsHandledInRemoteProcess();
}
/**
* Return true if the event should be sent back to its parent process.
* So, usual event handlers shouldn't call this.
*/
inline bool WantReplyFromContentProcess() const {
return mFlags.WantReplyFromContentProcess();
}
/**
* Mark the event has already posted to a remote process.
*/
inline void MarkAsPostedToRemoteProcess() {
mFlags.MarkAsPostedToRemoteProcess();
}
/**
* Reset the cross process dispatching state. This should be used when a
* process receives the event because the state is in the sender.
*/
inline void ResetCrossProcessDispatchingState() {
mFlags.ResetCrossProcessDispatchingState();
}
/**
* Return true if the event has been posted to a remote process.
*/
inline bool HasBeenPostedToRemoteProcess() const {
return mFlags.HasBeenPostedToRemoteProcess();
}
/**
* Return true if the event came from another process.
*/
inline bool CameFromAnotherProcess() const {
return mFlags.CameFromAnotherProcess();
}
/**
* Mark the event as coming from another process.
*/
inline void MarkAsComingFromAnotherProcess() {
mFlags.MarkAsComingFromAnotherProcess();
}
/**
* Mark the event is reserved by chrome. I.e., shouldn't be dispatched to
* content because it shouldn't be cancelable.
*/
inline void MarkAsReservedByChrome() { mFlags.MarkAsReservedByChrome(); }
/**
* Return true if the event is reserved by chrome.
*/
inline bool IsReservedByChrome() const { return mFlags.IsReservedByChrome(); }
/**
* Utils for checking event types
*/
/**
* As*Event() returns the pointer of the instance only when the instance is
* the class or one of its derived class.
*/
#define NS_ROOT_EVENT_CLASS(aPrefix, aName)
#define NS_EVENT_CLASS(aPrefix, aName) \
virtual aPrefix##aName* As##aName(); \
const aPrefix##aName* As##aName() const;
#include "mozilla/EventClassList.h"
#undef NS_EVENT_CLASS
#undef NS_ROOT_EVENT_CLASS
/**
* Returns true if the event is a query content event.
*/
bool IsQueryContentEvent() const;
/**
* Returns true if the event is a selection event.
*/
bool IsSelectionEvent() const;
/**
* Returns true if the event is a content command event.
*/
bool IsContentCommandEvent() const;
/**
* Returns true if the event mMessage is one of mouse events.
*/
bool HasMouseEventMessage() const;
/**
* Returns true if the event class is eMouseEventClass or the event message
* is ePointerClick.
*/
[[nodiscard]] bool IsMouseEventClassOrHasClickRelatedPointerEvent() const;
/**
* Returns true if the event mMessage is one of drag events.
*/
bool HasDragEventMessage() const;
/**
* Returns true if aMessage or mMessage is one of key events.
*/
static bool IsKeyEventMessage(EventMessage aMessage);
bool HasKeyEventMessage() const { return IsKeyEventMessage(mMessage); }
/**
* Returns true if the event mMessage is one of composition events or text
* event.
*/
bool HasIMEEventMessage() const;
/**
* Returns true if the event can be sent to remote process.
*/
bool CanBeSentToRemoteProcess() const;
/**
* Returns true if the original target is a remote process and the event
* will be posted to the remote process later.
*/
bool WillBeSentToRemoteProcess() const;
/**
* Returns true if the event is related to IME handling. It includes
* IME events, query content events and selection events.
* Be careful when you use this.
*/
bool IsIMERelatedEvent() const;
/**
* Whether the event should be handled by the frame of the mouse cursor
* position or not. When it should be handled there (e.g., the mouse events),
* this returns true.
*/
bool IsUsingCoordinates() const;
/**
* Whether the event should be handled by the focused DOM window in the
* same top level window's or not. E.g., key events, IME related events
* (including the query content events, they are used in IME transaction)
* should be handled by the (last) focused window rather than the dispatched
* window.
*
* NOTE: Even if this returns true, the event isn't going to be handled by the
* application level active DOM window which is on another top level window.
* So, when the event is fired on a deactive window, the event is going to be
* handled by the last focused DOM window in the last focused window.
*/
bool IsTargetedAtFocusedWindow() const;
/**
* Whether the event should be handled by the focused content or not. E.g.,
* key events, IME related events and other input events which are not handled
* by the frame of the mouse cursor position.
*
* NOTE: Even if this returns true, the event isn't going to be handled by the
* application level active DOM window which is on another top level window.
* So, when the event is fired on a deactive window, the event is going to be
* handled by the last focused DOM element of the last focused DOM window in
* the last focused window.
*/
bool IsTargetedAtFocusedContent() const;
/**
* Whether the event should cause a DOM event.
*/
bool IsAllowedToDispatchDOMEvent() const;
/**
* Whether the event should be dispatched in system group.
*/
bool IsAllowedToDispatchInSystemGroup() const;
/**
* Whether the event should be blocked for fingerprinting resistance.
*/
bool IsBlockedForFingerprintingResistance() const;
/**
* Whether the event handler can flush pending notifications or not.
*/
bool AllowFlushingPendingNotifications() const;
/**
* Initialize mComposed
*/
void SetDefaultComposed() {
switch (mClass) {
case eClipboardEventClass:
mFlags.mComposed = true;
break;
case eCompositionEventClass:
mFlags.mComposed =
mMessage == eCompositionStart || mMessage == eCompositionUpdate ||
mMessage == eCompositionChange || mMessage == eCompositionEnd;
break;
case eDragEventClass:
// All drag & drop events are composed
mFlags.mComposed = mMessage == eDrag || mMessage == eDragEnd ||
mMessage == eDragEnter || mMessage == eDragExit ||
mMessage == eDragLeave || mMessage == eDragOver ||
mMessage == eDragStart || mMessage == eDrop;
break;
case eEditorInputEventClass:
mFlags.mComposed =
mMessage == eEditorInput || mMessage == eEditorBeforeInput;
break;
case eFocusEventClass:
mFlags.mComposed = mMessage == eBlur || mMessage == eFocus ||
mMessage == eFocusOut || mMessage == eFocusIn;
break;
case eKeyboardEventClass:
mFlags.mComposed =
mMessage == eKeyDown || mMessage == eKeyUp || mMessage == eKeyPress;
break;
case eMouseEventClass:
mFlags.mComposed =
mMessage == eMouseDoubleClick || mMessage == eMouseDown ||
mMessage == eMouseUp || mMessage == eMouseOver ||
mMessage == eMouseOut || mMessage == eMouseMove ||
mMessage == eXULPopupShowing || mMessage == eXULPopupHiding ||
mMessage == eXULPopupShown || mMessage == eXULPopupHidden ||
// `click` event, `auxclick` event and `contextmenu` event should be
// created as a PointerEvent, but they were MouseEvent before.
// Additionally, we support dispatching untrusted these events to
// some elements may cause a default action of it even if they are
// created with MouseEvent. Therefore, we need to allow these event
// messages here.
mMessage == ePointerClick || mMessage == ePointerAuxClick ||
mMessage == eContextMenu;
break;
case ePointerEventClass:
// All pointer events are composed
mFlags.mComposed =
mMessage == ePointerClick || mMessage == ePointerAuxClick ||
mMessage == eContextMenu || mMessage == ePointerDown ||
mMessage == ePointerMove || mMessage == ePointerUp ||
mMessage == ePointerCancel || mMessage == ePointerOver ||
mMessage == ePointerOut || mMessage == ePointerGotCapture ||
mMessage == ePointerLostCapture;
break;
case eTouchEventClass:
// All touch events are composed
mFlags.mComposed = mMessage == eTouchStart || mMessage == eTouchEnd ||
mMessage == eTouchMove || mMessage == eTouchCancel;
break;
case eUIEventClass:
mFlags.mComposed = mMessage == eLegacyDOMFocusIn ||
mMessage == eLegacyDOMFocusOut ||
mMessage == eLegacyDOMActivate;
break;
case eWheelEventClass:
// All wheel events are composed
mFlags.mComposed = mMessage == eWheel;
break;
case eMouseScrollEventClass:
// Legacy mouse scroll events are composed too, for consistency with
// wheel.
mFlags.mComposed = mMessage == eLegacyMouseLineOrPageScroll ||
mMessage == eLegacyMousePixelScroll;
break;
default:
mFlags.mComposed = false;
break;
}
}
void SetComposed(const nsAString& aEventTypeArg) {
mFlags.mComposed = // composition events
aEventTypeArg.EqualsLiteral("compositionstart") ||
aEventTypeArg.EqualsLiteral("compositionupdate") ||
aEventTypeArg.EqualsLiteral("compositionend") ||
aEventTypeArg.EqualsLiteral("text") ||
// drag and drop events
aEventTypeArg.EqualsLiteral("dragstart") ||
aEventTypeArg.EqualsLiteral("drag") ||
aEventTypeArg.EqualsLiteral("dragenter") ||
aEventTypeArg.EqualsLiteral("dragexit") ||
aEventTypeArg.EqualsLiteral("dragleave") ||
aEventTypeArg.EqualsLiteral("dragover") ||
aEventTypeArg.EqualsLiteral("drop") ||
aEventTypeArg.EqualsLiteral("dropend") ||
// editor input events
aEventTypeArg.EqualsLiteral("input") ||
aEventTypeArg.EqualsLiteral("beforeinput") ||
// focus events
aEventTypeArg.EqualsLiteral("blur") ||
aEventTypeArg.EqualsLiteral("focus") ||
aEventTypeArg.EqualsLiteral("focusin") ||
aEventTypeArg.EqualsLiteral("focusout") ||
// keyboard events
aEventTypeArg.EqualsLiteral("keydown") ||
aEventTypeArg.EqualsLiteral("keyup") ||
aEventTypeArg.EqualsLiteral("keypress") ||
// mouse events
aEventTypeArg.EqualsLiteral("click") ||
aEventTypeArg.EqualsLiteral("dblclick") ||
aEventTypeArg.EqualsLiteral("mousedown") ||
aEventTypeArg.EqualsLiteral("mouseup") ||
aEventTypeArg.EqualsLiteral("mouseenter") ||
aEventTypeArg.EqualsLiteral("mouseleave") ||
aEventTypeArg.EqualsLiteral("mouseover") ||
aEventTypeArg.EqualsLiteral("mouseout") ||
aEventTypeArg.EqualsLiteral("mousemove") ||
aEventTypeArg.EqualsLiteral("contextmenu") ||
// pointer events
aEventTypeArg.EqualsLiteral("pointerdown") ||
aEventTypeArg.EqualsLiteral("pointermove") ||
aEventTypeArg.EqualsLiteral("pointerup") ||
aEventTypeArg.EqualsLiteral("pointercancel") ||
aEventTypeArg.EqualsLiteral("pointerover") ||
aEventTypeArg.EqualsLiteral("pointerout") ||
aEventTypeArg.EqualsLiteral("pointerenter") ||
aEventTypeArg.EqualsLiteral("pointerleave") ||
aEventTypeArg.EqualsLiteral("gotpointercapture") ||
aEventTypeArg.EqualsLiteral("lostpointercapture") ||
// touch events
aEventTypeArg.EqualsLiteral("touchstart") ||
aEventTypeArg.EqualsLiteral("touchend") ||
aEventTypeArg.EqualsLiteral("touchmove") ||
aEventTypeArg.EqualsLiteral("touchcancel") ||
// UI legacy events
aEventTypeArg.EqualsLiteral("DOMFocusIn") ||
aEventTypeArg.EqualsLiteral("DOMFocusOut") ||
aEventTypeArg.EqualsLiteral("DOMActivate") ||
// wheel events
aEventTypeArg.EqualsLiteral("wheel");
}
void SetComposed(bool aComposed) { mFlags.mComposed = aComposed; }
void SetDefaultComposedInNativeAnonymousContent() {
// For compatibility concerns, we set mComposedInNativeAnonymousContent to
// false for those events we want to stop propagation.
//
// nsVideoFrame may create anonymous image element which fires eLoad,
// eLoadStart, eLoadEnd, eLoadError. We don't want these events cross
// the boundary of NAC
mFlags.mComposedInNativeAnonymousContent =
mMessage != eLoad && mMessage != eLoadStart && mMessage != eLoadEnd &&
mMessage != eLoadError;
}
bool IsUserAction() const;
/**
* Return true if the event should be handled without (pointer) capturing
* element.
*/
[[nodiscard]] bool ShouldIgnoreCapturingContent() const;
};
/******************************************************************************
* mozilla::WidgetGUIEvent
******************************************************************************/
class WidgetGUIEvent : public WidgetEvent {
protected:
WidgetGUIEvent(bool aIsTrusted, EventMessage aMessage, nsIWidget* aWidget,
EventClassID aEventClassID,
const WidgetEventTime* aTime = nullptr)
: WidgetEvent(aIsTrusted, aMessage, aEventClassID, aTime),
mWidget(aWidget) {}
WidgetGUIEvent() = default;
public:
virtual WidgetGUIEvent* AsGUIEvent() override { return this; }
WidgetGUIEvent(bool aIsTrusted, EventMessage aMessage, nsIWidget* aWidget,
const WidgetEventTime* aTime = nullptr)
: WidgetEvent(aIsTrusted, aMessage, eGUIEventClass, aTime),
mWidget(aWidget) {}
virtual WidgetEvent* Duplicate() const override {
MOZ_ASSERT(mClass == eGUIEventClass,
"Duplicate() must be overridden by sub class");
// Not copying widget, it is a weak reference.
WidgetGUIEvent* result = new WidgetGUIEvent(false, mMessage, nullptr, this);
result->AssignGUIEventData(*this, true);
result->mFlags = mFlags;
return result;
}
// Originator of the event
nsCOMPtr<nsIWidget> mWidget;
void AssignGUIEventData(const WidgetGUIEvent& aEvent, bool aCopyTargets) {
AssignEventData(aEvent, aCopyTargets);
// widget should be initialized with the constructor.
}
};
/******************************************************************************
* mozilla::Modifier
*
* All modifier keys should be defined here. This is used for managing
* modifier states for DOM Level 3 or later.
******************************************************************************/
enum Modifier {
MODIFIER_NONE = 0x0000,
MODIFIER_ALT = 0x0001,
MODIFIER_ALTGRAPH = 0x0002,
MODIFIER_CAPSLOCK = 0x0004,
MODIFIER_CONTROL = 0x0008,
MODIFIER_FN = 0x0010,
MODIFIER_FNLOCK = 0x0020,
MODIFIER_META = 0x0040,
MODIFIER_NUMLOCK = 0x0080,
MODIFIER_SCROLLLOCK = 0x0100,
MODIFIER_SHIFT = 0x0200,
MODIFIER_SYMBOL = 0x0400,
MODIFIER_SYMBOLLOCK = 0x0800,
};
/******************************************************************************
* Modifier key names.
******************************************************************************/
#define NS_DOM_KEYNAME_ALT "Alt"
#define NS_DOM_KEYNAME_ALTGRAPH "AltGraph"
#define NS_DOM_KEYNAME_CAPSLOCK "CapsLock"
#define NS_DOM_KEYNAME_CONTROL "Control"
#define NS_DOM_KEYNAME_FN "Fn"
#define NS_DOM_KEYNAME_FNLOCK "FnLock"
#define NS_DOM_KEYNAME_META "Meta"
#define NS_DOM_KEYNAME_NUMLOCK "NumLock"
#define NS_DOM_KEYNAME_SCROLLLOCK "ScrollLock"
#define NS_DOM_KEYNAME_SHIFT "Shift"
#define NS_DOM_KEYNAME_SYMBOL "Symbol"
#define NS_DOM_KEYNAME_SYMBOLLOCK "SymbolLock"
#define NS_DOM_KEYNAME_OS "OS"
/******************************************************************************
* mozilla::Modifiers
******************************************************************************/
typedef uint16_t Modifiers;
class MOZ_STACK_CLASS GetModifiersName final : public nsAutoCString {
public:
explicit GetModifiersName(Modifiers aModifiers) {
if (aModifiers & MODIFIER_ALT) {
AssignLiteral(NS_DOM_KEYNAME_ALT);
}
if (aModifiers & MODIFIER_ALTGRAPH) {
MaybeAppendSeparator();
AppendLiteral(NS_DOM_KEYNAME_ALTGRAPH);
}
if (aModifiers & MODIFIER_CAPSLOCK) {
MaybeAppendSeparator();
AppendLiteral(NS_DOM_KEYNAME_CAPSLOCK);
}
if (aModifiers & MODIFIER_CONTROL) {
MaybeAppendSeparator();
AppendLiteral(NS_DOM_KEYNAME_CONTROL);
}
if (aModifiers & MODIFIER_FN) {
MaybeAppendSeparator();
AppendLiteral(NS_DOM_KEYNAME_FN);
}
if (aModifiers & MODIFIER_FNLOCK) {
MaybeAppendSeparator();
AppendLiteral(NS_DOM_KEYNAME_FNLOCK);
}
if (aModifiers & MODIFIER_META) {
MaybeAppendSeparator();
AppendLiteral(NS_DOM_KEYNAME_META);
}
if (aModifiers & MODIFIER_NUMLOCK) {
MaybeAppendSeparator();
AppendLiteral(NS_DOM_KEYNAME_NUMLOCK);
}
if (aModifiers & MODIFIER_SCROLLLOCK) {
MaybeAppendSeparator();
AppendLiteral(NS_DOM_KEYNAME_SCROLLLOCK);
}
if (aModifiers & MODIFIER_SHIFT) {
MaybeAppendSeparator();
AppendLiteral(NS_DOM_KEYNAME_SHIFT);
}
if (aModifiers & MODIFIER_SYMBOL) {
MaybeAppendSeparator();
AppendLiteral(NS_DOM_KEYNAME_SYMBOL);
}
if (aModifiers & MODIFIER_SYMBOLLOCK) {
MaybeAppendSeparator();
AppendLiteral(NS_DOM_KEYNAME_SYMBOLLOCK);
}
if (IsEmpty()) {
AssignLiteral("none");
}
}
private:
void MaybeAppendSeparator() {
if (!IsEmpty()) {
AppendLiteral(" | ");
}
}
};
/******************************************************************************
* mozilla::WidgetInputEvent
******************************************************************************/
class WidgetInputEvent : public WidgetGUIEvent {
protected:
WidgetInputEvent(bool aIsTrusted, EventMessage aMessage, nsIWidget* aWidget,
EventClassID aEventClassID,
const WidgetEventTime* aTime = nullptr)
: WidgetGUIEvent(aIsTrusted, aMessage, aWidget, aEventClassID, aTime),
mModifiers(0) {}
WidgetInputEvent() : mModifiers(0) {}
public:
virtual WidgetInputEvent* AsInputEvent() override { return this; }
WidgetInputEvent(bool aIsTrusted, EventMessage aMessage, nsIWidget* aWidget,
const WidgetEventTime* aTime = nullptr)
: WidgetGUIEvent(aIsTrusted, aMessage, aWidget, eInputEventClass, aTime),
mModifiers(0) {}
virtual WidgetEvent* Duplicate() const override {
MOZ_ASSERT(mClass == eInputEventClass,
"Duplicate() must be overridden by sub class");
// Not copying widget, it is a weak reference.
WidgetInputEvent* result =
new WidgetInputEvent(false, mMessage, nullptr, this);
result->AssignInputEventData(*this, true);
result->mFlags = mFlags;
return result;
}
/**
* Returns a modifier of "Accel" virtual modifier which is used for shortcut
* key.
*/
static Modifier AccelModifier();
/**
* GetModifier() returns a modifier flag which is activated by aDOMKeyName.
*/
static Modifier GetModifier(const nsAString& aDOMKeyName);
// true indicates the accel key on the environment is down
bool IsAccel() const { return ((mModifiers & AccelModifier()) != 0); }
// true indicates the shift key is down
bool IsShift() const { return ((mModifiers & MODIFIER_SHIFT) != 0); }
// true indicates the control key is down
bool IsControl() const { return ((mModifiers & MODIFIER_CONTROL) != 0); }
// true indicates the alt key is down
bool IsAlt() const { return ((mModifiers & MODIFIER_ALT) != 0); }
// true indicates the meta key is down (Command key on macOS, Windows logo key
// on Windows, Super/Hyper key on Linux, Meta key on Android).
bool IsMeta() const { return ((mModifiers & MODIFIER_META) != 0); }
// true indicates the alt graph key is down
// NOTE: on Mac, the option key press causes both IsAlt() and IsAltGrpah()
// return true.
bool IsAltGraph() const { return ((mModifiers & MODIFIER_ALTGRAPH) != 0); }
// true indicates the CapLock LED is turn on.
bool IsCapsLocked() const { return ((mModifiers & MODIFIER_CAPSLOCK) != 0); }
// true indicates the NumLock LED is turn on.
bool IsNumLocked() const { return ((mModifiers & MODIFIER_NUMLOCK) != 0); }
// true indicates the ScrollLock LED is turn on.
bool IsScrollLocked() const {
return ((mModifiers & MODIFIER_SCROLLLOCK) != 0);
}
// true indicates the Fn key is down, but this is not supported by native
// key event on any platform.
bool IsFn() const { return ((mModifiers & MODIFIER_FN) != 0); }
// true indicates the FnLock LED is turn on, but we don't know such
// keyboards nor platforms.
bool IsFnLocked() const { return ((mModifiers & MODIFIER_FNLOCK) != 0); }
// true indicates the Symbol is down, but this is not supported by native
// key event on any platforms.
bool IsSymbol() const { return ((mModifiers & MODIFIER_SYMBOL) != 0); }
// true indicates the SymbolLock LED is turn on, but we don't know such
// keyboards nor platforms.
bool IsSymbolLocked() const {
return ((mModifiers & MODIFIER_SYMBOLLOCK) != 0);
}
void InitBasicModifiers(bool aCtrlKey, bool aAltKey, bool aShiftKey,
bool aMetaKey) {
mModifiers = 0;
if (aCtrlKey) {
mModifiers |= MODIFIER_CONTROL;
}
if (aAltKey) {
mModifiers |= MODIFIER_ALT;
}
if (aShiftKey) {
mModifiers |= MODIFIER_SHIFT;
}
if (aMetaKey) {
mModifiers |= MODIFIER_META;
}
}
Modifiers mModifiers;
void AssignInputEventData(const WidgetInputEvent& aEvent, bool aCopyTargets) {
AssignGUIEventData(aEvent, aCopyTargets);
mModifiers = aEvent.mModifiers;
}
};
/******************************************************************************
* mozilla::InternalUIEvent
*
* XXX Why this inherits WidgetGUIEvent rather than WidgetEvent?
******************************************************************************/
class InternalUIEvent : public WidgetGUIEvent {
protected:
InternalUIEvent() : mDetail(0), mCausedByUntrustedEvent(false) {}
InternalUIEvent(bool aIsTrusted, EventMessage aMessage, nsIWidget* aWidget,
EventClassID aEventClassID,
const WidgetEventTime* aTime = nullptr)
: WidgetGUIEvent(aIsTrusted, aMessage, aWidget, aEventClassID, aTime),
mDetail(0),
mCausedByUntrustedEvent(false) {}
InternalUIEvent(bool aIsTrusted, EventMessage aMessage,
EventClassID aEventClassID,
const WidgetEventTime* aTime = nullptr)
: WidgetGUIEvent(aIsTrusted, aMessage, nullptr, aEventClassID, aTime),
mDetail(0),
mCausedByUntrustedEvent(false) {}
public:
virtual InternalUIEvent* AsUIEvent() override { return this; }
/**
* If the UIEvent is caused by another event (e.g., click event),
* aEventCausesThisEvent should be the event. If there is no such event,
* this should be nullptr.
*/
InternalUIEvent(bool aIsTrusted, EventMessage aMessage,
const WidgetEvent* aEventCausesThisEvent,
const WidgetEventTime* aTime = nullptr)
: WidgetGUIEvent(aIsTrusted, aMessage, nullptr, eUIEventClass, aTime),
mDetail(0),
mCausedByUntrustedEvent(aEventCausesThisEvent &&
!aEventCausesThisEvent->IsTrusted()) {}
virtual WidgetEvent* Duplicate() const override {
MOZ_ASSERT(mClass == eUIEventClass,
"Duplicate() must be overridden by sub class");
InternalUIEvent* result =
new InternalUIEvent(false, mMessage, nullptr, this);
result->AssignUIEventData(*this, true);
result->mFlags = mFlags;
return result;
}
int32_t mDetail;
// mCausedByUntrustedEvent is true if the event is caused by untrusted event.
bool mCausedByUntrustedEvent;
// If you check the event is a trusted event and NOT caused by an untrusted
// event, IsTrustable() returns what you expected.
bool IsTrustable() const { return IsTrusted() && !mCausedByUntrustedEvent; }
void AssignUIEventData(const InternalUIEvent& aEvent, bool aCopyTargets) {
AssignGUIEventData(aEvent, aCopyTargets);
mDetail = aEvent.mDetail;
mCausedByUntrustedEvent = aEvent.mCausedByUntrustedEvent;
}
};
} // namespace mozilla
#endif // mozilla_BasicEvents_h__
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