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gecko-dev/dom/events/Event.cpp

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28 KiB
C++
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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/. */
#include "AccessCheck.h"
#include "base/basictypes.h"
#include "ipc/IPCMessageUtils.h"
#include "mozilla/dom/Event.h"
#include "mozilla/ContentEvents.h"
#include "mozilla/InternalMutationEvent.h"
#include "mozilla/MiscEvents.h"
#include "mozilla/MouseEvents.h"
#include "mozilla/Preferences.h"
#include "mozilla/TextEvents.h"
#include "mozilla/TouchEvents.h"
#include "nsContentUtils.h"
#include "nsCOMPtr.h"
#include "nsDeviceContext.h"
#include "nsDOMEventTargetHelper.h"
#include "nsError.h"
#include "nsEventStateManager.h"
#include "nsGlobalWindow.h"
#include "nsIFrame.h"
#include "nsIContent.h"
#include "nsIDocument.h"
#include "nsIPresShell.h"
#include "nsIScrollableFrame.h"
#include "nsJSEnvironment.h"
#include "nsLayoutUtils.h"
#include "nsPIWindowRoot.h"
namespace mozilla {
namespace dom {
namespace workers {
extern bool IsCurrentThreadRunningChromeWorker();
} // namespace workers
static char *sPopupAllowedEvents;
Event::Event(EventTarget* aOwner,
nsPresContext* aPresContext,
WidgetEvent* aEvent)
{
ConstructorInit(aOwner, aPresContext, aEvent);
}
Event::Event(nsPIDOMWindow* aParent)
{
ConstructorInit(static_cast<nsGlobalWindow *>(aParent), nullptr, nullptr);
}
void
Event::ConstructorInit(EventTarget* aOwner,
nsPresContext* aPresContext,
WidgetEvent* aEvent)
{
SetIsDOMBinding();
SetOwner(aOwner);
mIsMainThreadEvent = mOwner || NS_IsMainThread();
if (mIsMainThreadEvent) {
nsJSContext::LikelyShortLivingObjectCreated();
}
mPrivateDataDuplicated = false;
if (aEvent) {
mEvent = aEvent;
mEventIsInternal = false;
}
else {
mEventIsInternal = true;
/*
A derived class might want to allocate its own type of aEvent
(derived from WidgetEvent). To do this, it should take care to pass
a non-nullptr aEvent to this ctor, e.g.:
FooEvent::FooEvent(..., WidgetEvent* aEvent)
: Event(..., aEvent ? aEvent : new WidgetEvent())
Then, to override the mEventIsInternal assignments done by the
base ctor, it should do this in its own ctor:
FooEvent::FooEvent(..., WidgetEvent* aEvent)
...
{
...
if (aEvent) {
mEventIsInternal = false;
}
else {
mEventIsInternal = true;
}
...
}
*/
mEvent = new WidgetEvent(false, 0);
mEvent->time = PR_Now();
}
InitPresContextData(aPresContext);
}
void
Event::InitPresContextData(nsPresContext* aPresContext)
{
mPresContext = aPresContext;
// Get the explicit original target (if it's anonymous make it null)
{
nsCOMPtr<nsIContent> content = GetTargetFromFrame();
mExplicitOriginalTarget = content;
if (content && content->IsInAnonymousSubtree()) {
mExplicitOriginalTarget = nullptr;
}
}
}
Event::~Event()
{
NS_ASSERT_OWNINGTHREAD(Event);
if (mEventIsInternal && mEvent) {
delete mEvent;
}
}
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(Event)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_ENTRY(nsIDOMEvent)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(Event)
NS_IMPL_CYCLE_COLLECTING_RELEASE(Event)
NS_IMPL_CYCLE_COLLECTION_CLASS(Event)
NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(Event)
NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
NS_IMPL_CYCLE_COLLECTION_TRACE_END
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(Event)
if (tmp->mEventIsInternal) {
tmp->mEvent->target = nullptr;
tmp->mEvent->currentTarget = nullptr;
tmp->mEvent->originalTarget = nullptr;
switch (tmp->mEvent->eventStructType) {
case NS_MOUSE_EVENT:
case NS_MOUSE_SCROLL_EVENT:
case NS_WHEEL_EVENT:
case NS_SIMPLE_GESTURE_EVENT:
case NS_POINTER_EVENT:
tmp->mEvent->AsMouseEventBase()->relatedTarget = nullptr;
break;
case NS_DRAG_EVENT: {
WidgetDragEvent* dragEvent = tmp->mEvent->AsDragEvent();
dragEvent->dataTransfer = nullptr;
dragEvent->relatedTarget = nullptr;
break;
}
case NS_CLIPBOARD_EVENT:
tmp->mEvent->AsClipboardEvent()->clipboardData = nullptr;
break;
case NS_MUTATION_EVENT:
tmp->mEvent->AsMutationEvent()->mRelatedNode = nullptr;
break;
case NS_FOCUS_EVENT:
tmp->mEvent->AsFocusEvent()->relatedTarget = nullptr;
break;
default:
break;
}
}
NS_IMPL_CYCLE_COLLECTION_UNLINK(mPresContext);
NS_IMPL_CYCLE_COLLECTION_UNLINK(mExplicitOriginalTarget);
NS_IMPL_CYCLE_COLLECTION_UNLINK(mOwner);
NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(Event)
if (tmp->mEventIsInternal) {
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mEvent->target)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mEvent->currentTarget)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mEvent->originalTarget)
switch (tmp->mEvent->eventStructType) {
case NS_MOUSE_EVENT:
case NS_MOUSE_SCROLL_EVENT:
case NS_WHEEL_EVENT:
case NS_SIMPLE_GESTURE_EVENT:
case NS_POINTER_EVENT:
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mEvent->relatedTarget");
cb.NoteXPCOMChild(tmp->mEvent->AsMouseEventBase()->relatedTarget);
break;
case NS_DRAG_EVENT: {
WidgetDragEvent* dragEvent = tmp->mEvent->AsDragEvent();
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mEvent->dataTransfer");
cb.NoteXPCOMChild(dragEvent->dataTransfer);
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mEvent->relatedTarget");
cb.NoteXPCOMChild(dragEvent->relatedTarget);
break;
}
case NS_CLIPBOARD_EVENT:
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mEvent->clipboardData");
cb.NoteXPCOMChild(tmp->mEvent->AsClipboardEvent()->clipboardData);
break;
case NS_MUTATION_EVENT:
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mEvent->mRelatedNode");
cb.NoteXPCOMChild(tmp->mEvent->AsMutationEvent()->mRelatedNode);
break;
case NS_FOCUS_EVENT:
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mEvent->relatedTarget");
cb.NoteXPCOMChild(tmp->mEvent->AsFocusEvent()->relatedTarget);
break;
default:
break;
}
}
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mPresContext)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mExplicitOriginalTarget)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mOwner)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
bool
Event::IsChrome(JSContext* aCx) const
{
return mIsMainThreadEvent ?
xpc::AccessCheck::isChrome(js::GetContextCompartment(aCx)) :
mozilla::dom::workers::IsCurrentThreadRunningChromeWorker();
}
// nsIDOMEventInterface
NS_METHOD
Event::GetType(nsAString& aType)
{
if (!mIsMainThreadEvent || !mEvent->typeString.IsEmpty()) {
aType = mEvent->typeString;
return NS_OK;
}
const char* name = GetEventName(mEvent->message);
if (name) {
CopyASCIItoUTF16(name, aType);
return NS_OK;
} else if (mEvent->message == NS_USER_DEFINED_EVENT && mEvent->userType) {
aType = Substring(nsDependentAtomString(mEvent->userType), 2); // Remove "on"
mEvent->typeString = aType;
return NS_OK;
}
aType.Truncate();
return NS_OK;
}
static EventTarget*
GetDOMEventTarget(nsIDOMEventTarget* aTarget)
{
return aTarget ? aTarget->GetTargetForDOMEvent() : nullptr;
}
EventTarget*
Event::GetTarget() const
{
return GetDOMEventTarget(mEvent->target);
}
NS_METHOD
Event::GetTarget(nsIDOMEventTarget** aTarget)
{
NS_IF_ADDREF(*aTarget = GetTarget());
return NS_OK;
}
EventTarget*
Event::GetCurrentTarget() const
{
return GetDOMEventTarget(mEvent->currentTarget);
}
NS_IMETHODIMP
Event::GetCurrentTarget(nsIDOMEventTarget** aCurrentTarget)
{
NS_IF_ADDREF(*aCurrentTarget = GetCurrentTarget());
return NS_OK;
}
//
// Get the actual event target node (may have been retargeted for mouse events)
//
already_AddRefed<nsIContent>
Event::GetTargetFromFrame()
{
if (!mPresContext) { return nullptr; }
// Get the target frame (have to get the ESM first)
nsIFrame* targetFrame = mPresContext->EventStateManager()->GetEventTarget();
if (!targetFrame) { return nullptr; }
// get the real content
nsCOMPtr<nsIContent> realEventContent;
targetFrame->GetContentForEvent(mEvent, getter_AddRefs(realEventContent));
return realEventContent.forget();
}
EventTarget*
Event::GetExplicitOriginalTarget() const
{
if (mExplicitOriginalTarget) {
return mExplicitOriginalTarget;
}
return GetTarget();
}
NS_IMETHODIMP
Event::GetExplicitOriginalTarget(nsIDOMEventTarget** aRealEventTarget)
{
NS_IF_ADDREF(*aRealEventTarget = GetExplicitOriginalTarget());
return NS_OK;
}
EventTarget*
Event::GetOriginalTarget() const
{
if (mEvent->originalTarget) {
return GetDOMEventTarget(mEvent->originalTarget);
}
return GetTarget();
}
NS_IMETHODIMP
Event::GetOriginalTarget(nsIDOMEventTarget** aOriginalTarget)
{
NS_IF_ADDREF(*aOriginalTarget = GetOriginalTarget());
return NS_OK;
}
NS_IMETHODIMP_(void)
Event::SetTrusted(bool aTrusted)
{
mEvent->mFlags.mIsTrusted = aTrusted;
}
bool
Event::Init(mozilla::dom::EventTarget* aGlobal)
{
if (!mIsMainThreadEvent) {
return nsContentUtils::ThreadsafeIsCallerChrome();
}
bool trusted = false;
nsCOMPtr<nsPIDOMWindow> w = do_QueryInterface(aGlobal);
if (w) {
nsCOMPtr<nsIDocument> d = w->GetExtantDoc();
if (d) {
trusted = nsContentUtils::IsChromeDoc(d);
nsIPresShell* s = d->GetShell();
if (s) {
InitPresContextData(s->GetPresContext());
}
}
}
return trusted;
}
// static
already_AddRefed<Event>
Event::Constructor(const GlobalObject& aGlobal,
const nsAString& aType,
const EventInit& aParam,
ErrorResult& aRv)
{
nsCOMPtr<mozilla::dom::EventTarget> t = do_QueryInterface(aGlobal.GetAsSupports());
nsRefPtr<Event> e = new Event(t, nullptr, nullptr);
bool trusted = e->Init(t);
aRv = e->InitEvent(aType, aParam.mBubbles, aParam.mCancelable);
e->SetTrusted(trusted);
return e.forget();
}
uint16_t
Event::EventPhase() const
{
// Note, remember to check that this works also
// if or when Bug 235441 is fixed.
if ((mEvent->currentTarget &&
mEvent->currentTarget == mEvent->target) ||
mEvent->mFlags.InTargetPhase()) {
return nsIDOMEvent::AT_TARGET;
}
if (mEvent->mFlags.mInCapturePhase) {
return nsIDOMEvent::CAPTURING_PHASE;
}
if (mEvent->mFlags.mInBubblingPhase) {
return nsIDOMEvent::BUBBLING_PHASE;
}
return nsIDOMEvent::NONE;
}
NS_IMETHODIMP
Event::GetEventPhase(uint16_t* aEventPhase)
{
*aEventPhase = EventPhase();
return NS_OK;
}
NS_IMETHODIMP
Event::GetBubbles(bool* aBubbles)
{
*aBubbles = Bubbles();
return NS_OK;
}
NS_IMETHODIMP
Event::GetCancelable(bool* aCancelable)
{
*aCancelable = Cancelable();
return NS_OK;
}
NS_IMETHODIMP
Event::GetTimeStamp(uint64_t* aTimeStamp)
{
*aTimeStamp = TimeStamp();
return NS_OK;
}
NS_IMETHODIMP
Event::StopPropagation()
{
mEvent->mFlags.mPropagationStopped = true;
return NS_OK;
}
NS_IMETHODIMP
Event::StopImmediatePropagation()
{
mEvent->mFlags.mPropagationStopped = true;
mEvent->mFlags.mImmediatePropagationStopped = true;
return NS_OK;
}
NS_IMETHODIMP
Event::GetIsTrusted(bool* aIsTrusted)
{
*aIsTrusted = IsTrusted();
return NS_OK;
}
NS_IMETHODIMP
Event::PreventDefault()
{
// This method is called only from C++ code which must handle default action
// of this event. So, pass true always.
PreventDefaultInternal(true);
return NS_OK;
}
void
Event::PreventDefault(JSContext* aCx)
{
MOZ_ASSERT(aCx, "JS context must be specified");
// Note that at handling default action, another event may be dispatched.
// Then, JS in content mey be call preventDefault()
// even in the event is in system event group. Therefore, don't refer
// mInSystemGroup here.
PreventDefaultInternal(IsChrome(aCx));
}
void
Event::PreventDefaultInternal(bool aCalledByDefaultHandler)
{
if (!mEvent->mFlags.mCancelable) {
return;
}
mEvent->mFlags.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) {
mEvent->mFlags.mDefaultPreventedByContent = true;
}
if (!IsTrusted()) {
return;
}
WidgetDragEvent* dragEvent = mEvent->AsDragEvent();
if (!dragEvent) {
return;
}
nsCOMPtr<nsINode> node = do_QueryInterface(mEvent->currentTarget);
if (!node) {
nsCOMPtr<nsPIDOMWindow> win = do_QueryInterface(mEvent->currentTarget);
if (!win) {
return;
}
node = win->GetExtantDoc();
}
if (!nsContentUtils::IsChromeDoc(node->OwnerDoc())) {
dragEvent->mDefaultPreventedOnContent = true;
}
}
void
Event::SetEventType(const nsAString& aEventTypeArg)
{
if (mIsMainThreadEvent) {
mEvent->userType =
nsContentUtils::GetEventIdAndAtom(aEventTypeArg, mEvent->eventStructType,
&(mEvent->message));
} else {
mEvent->userType = nullptr;
mEvent->message = NS_USER_DEFINED_EVENT;
mEvent->typeString = aEventTypeArg;
}
}
NS_IMETHODIMP
Event::InitEvent(const nsAString& aEventTypeArg,
bool aCanBubbleArg,
bool aCancelableArg)
{
// Make sure this event isn't already being dispatched.
NS_ENSURE_TRUE(!mEvent->mFlags.mIsBeingDispatched, NS_OK);
if (IsTrusted()) {
// Ensure the caller is permitted to dispatch trusted DOM events.
if (!nsContentUtils::ThreadsafeIsCallerChrome()) {
SetTrusted(false);
}
}
SetEventType(aEventTypeArg);
mEvent->mFlags.mBubbles = aCanBubbleArg;
mEvent->mFlags.mCancelable = aCancelableArg;
mEvent->mFlags.mDefaultPrevented = false;
// Clearing the old targets, so that the event is targeted correctly when
// re-dispatching it.
mEvent->target = nullptr;
mEvent->originalTarget = nullptr;
return NS_OK;
}
NS_IMETHODIMP
Event::DuplicatePrivateData()
{
NS_ASSERTION(mEvent, "No WidgetEvent for Event duplication!");
if (mEventIsInternal) {
return NS_OK;
}
mEvent = mEvent->Duplicate();
mPresContext = nullptr;
mEventIsInternal = true;
mPrivateDataDuplicated = true;
return NS_OK;
}
NS_IMETHODIMP
Event::SetTarget(nsIDOMEventTarget* aTarget)
{
#ifdef DEBUG
{
nsCOMPtr<nsPIDOMWindow> win = do_QueryInterface(aTarget);
NS_ASSERTION(!win || !win->IsInnerWindow(),
"Uh, inner window set as event target!");
}
#endif
mEvent->target = do_QueryInterface(aTarget);
return NS_OK;
}
NS_IMETHODIMP_(bool)
Event::IsDispatchStopped()
{
return mEvent->mFlags.mPropagationStopped;
}
NS_IMETHODIMP_(WidgetEvent*)
Event::GetInternalNSEvent()
{
return mEvent;
}
NS_IMETHODIMP_(Event*)
Event::InternalDOMEvent()
{
return this;
}
// return true if eventName is contained within events, delimited by
// spaces
static bool
PopupAllowedForEvent(const char *eventName)
{
if (!sPopupAllowedEvents) {
Event::PopupAllowedEventsChanged();
if (!sPopupAllowedEvents) {
return false;
}
}
nsDependentCString events(sPopupAllowedEvents);
nsAFlatCString::const_iterator start, end;
nsAFlatCString::const_iterator startiter(events.BeginReading(start));
events.EndReading(end);
while (startiter != end) {
nsAFlatCString::const_iterator enditer(end);
if (!FindInReadable(nsDependentCString(eventName), startiter, enditer))
return false;
// the match is surrounded by spaces, or at a string boundary
if ((startiter == start || *--startiter == ' ') &&
(enditer == end || *enditer == ' ')) {
return true;
}
// Move on and see if there are other matches. (The delimitation
// requirement makes it pointless to begin the next search before
// the end of the invalid match just found.)
startiter = enditer;
}
return false;
}
// static
PopupControlState
Event::GetEventPopupControlState(WidgetEvent* aEvent)
{
// generally if an event handler is running, new windows are disallowed.
// check for exceptions:
PopupControlState abuse = openAbused;
switch(aEvent->eventStructType) {
case NS_EVENT :
// For these following events only allow popups if they're
// triggered while handling user input. See
// nsPresShell::HandleEventInternal() for details.
if (nsEventStateManager::IsHandlingUserInput()) {
switch(aEvent->message) {
case NS_FORM_SELECTED :
if (PopupAllowedForEvent("select")) {
abuse = openControlled;
}
break;
case NS_FORM_CHANGE :
if (PopupAllowedForEvent("change")) {
abuse = openControlled;
}
break;
}
}
break;
case NS_GUI_EVENT :
// For this following event only allow popups if it's triggered
// while handling user input. See
// nsPresShell::HandleEventInternal() for details.
if (nsEventStateManager::IsHandlingUserInput()) {
switch(aEvent->message) {
case NS_FORM_INPUT :
if (PopupAllowedForEvent("input")) {
abuse = openControlled;
}
break;
}
}
break;
case NS_INPUT_EVENT :
// For this following event only allow popups if it's triggered
// while handling user input. See
// nsPresShell::HandleEventInternal() for details.
if (nsEventStateManager::IsHandlingUserInput()) {
switch(aEvent->message) {
case NS_FORM_CHANGE :
if (PopupAllowedForEvent("change")) {
abuse = openControlled;
}
break;
case NS_XUL_COMMAND:
abuse = openControlled;
break;
}
}
break;
case NS_KEY_EVENT :
if (aEvent->mFlags.mIsTrusted) {
uint32_t key = aEvent->AsKeyboardEvent()->keyCode;
switch(aEvent->message) {
case NS_KEY_PRESS :
// return key on focused button. see note at NS_MOUSE_CLICK.
if (key == nsIDOMKeyEvent::DOM_VK_RETURN) {
abuse = openAllowed;
} else if (PopupAllowedForEvent("keypress")) {
abuse = openControlled;
}
break;
case NS_KEY_UP :
// space key on focused button. see note at NS_MOUSE_CLICK.
if (key == nsIDOMKeyEvent::DOM_VK_SPACE) {
abuse = openAllowed;
} else if (PopupAllowedForEvent("keyup")) {
abuse = openControlled;
}
break;
case NS_KEY_DOWN :
if (PopupAllowedForEvent("keydown")) {
abuse = openControlled;
}
break;
}
}
break;
case NS_TOUCH_EVENT :
if (aEvent->mFlags.mIsTrusted) {
switch (aEvent->message) {
case NS_TOUCH_START :
if (PopupAllowedForEvent("touchstart")) {
abuse = openControlled;
}
break;
case NS_TOUCH_END :
if (PopupAllowedForEvent("touchend")) {
abuse = openControlled;
}
break;
}
}
break;
case NS_MOUSE_EVENT :
if (aEvent->mFlags.mIsTrusted &&
aEvent->AsMouseEvent()->button == WidgetMouseEvent::eLeftButton) {
switch(aEvent->message) {
case NS_MOUSE_BUTTON_UP :
if (PopupAllowedForEvent("mouseup")) {
abuse = openControlled;
}
break;
case NS_MOUSE_BUTTON_DOWN :
if (PopupAllowedForEvent("mousedown")) {
abuse = openControlled;
}
break;
case NS_MOUSE_CLICK :
/* Click events get special treatment because of their
historical status as a more legitimate event handler. If
click popups are enabled in the prefs, clear the popup
status completely. */
if (PopupAllowedForEvent("click")) {
abuse = openAllowed;
}
break;
case NS_MOUSE_DOUBLECLICK :
if (PopupAllowedForEvent("dblclick")) {
abuse = openControlled;
}
break;
}
}
break;
case NS_FORM_EVENT :
// For these following events only allow popups if they're
// triggered while handling user input. See
// nsPresShell::HandleEventInternal() for details.
if (nsEventStateManager::IsHandlingUserInput()) {
switch(aEvent->message) {
case NS_FORM_SUBMIT :
if (PopupAllowedForEvent("submit")) {
abuse = openControlled;
}
break;
case NS_FORM_RESET :
if (PopupAllowedForEvent("reset")) {
abuse = openControlled;
}
break;
}
}
break;
default:
break;
}
return abuse;
}
// static
void
Event::PopupAllowedEventsChanged()
{
if (sPopupAllowedEvents) {
nsMemory::Free(sPopupAllowedEvents);
}
nsAdoptingCString str = Preferences::GetCString("dom.popup_allowed_events");
// We'll want to do this even if str is empty to avoid looking up
// this pref all the time if it's not set.
sPopupAllowedEvents = ToNewCString(str);
}
// static
void
Event::Shutdown()
{
if (sPopupAllowedEvents) {
nsMemory::Free(sPopupAllowedEvents);
}
}
nsIntPoint
Event::GetScreenCoords(nsPresContext* aPresContext,
WidgetEvent* aEvent,
LayoutDeviceIntPoint aPoint)
{
if (nsEventStateManager::sIsPointerLocked) {
return nsEventStateManager::sLastScreenPoint;
}
if (!aEvent ||
(aEvent->eventStructType != NS_MOUSE_EVENT &&
aEvent->eventStructType != NS_MOUSE_SCROLL_EVENT &&
aEvent->eventStructType != NS_WHEEL_EVENT &&
aEvent->eventStructType != NS_POINTER_EVENT &&
aEvent->eventStructType != NS_TOUCH_EVENT &&
aEvent->eventStructType != NS_DRAG_EVENT &&
aEvent->eventStructType != NS_SIMPLE_GESTURE_EVENT)) {
return nsIntPoint(0, 0);
}
WidgetGUIEvent* guiEvent = aEvent->AsGUIEvent();
if (!guiEvent->widget) {
return LayoutDeviceIntPoint::ToUntyped(aPoint);
}
LayoutDeviceIntPoint offset = aPoint +
LayoutDeviceIntPoint::FromUntyped(guiEvent->widget->WidgetToScreenOffset());
nscoord factor = aPresContext->DeviceContext()->UnscaledAppUnitsPerDevPixel();
return nsIntPoint(nsPresContext::AppUnitsToIntCSSPixels(offset.x * factor),
nsPresContext::AppUnitsToIntCSSPixels(offset.y * factor));
}
// static
CSSIntPoint
Event::GetPageCoords(nsPresContext* aPresContext,
WidgetEvent* aEvent,
LayoutDeviceIntPoint aPoint,
CSSIntPoint aDefaultPoint)
{
CSSIntPoint pagePoint =
Event::GetClientCoords(aPresContext, aEvent, aPoint, aDefaultPoint);
// If there is some scrolling, add scroll info to client point.
if (aPresContext && aPresContext->GetPresShell()) {
nsIPresShell* shell = aPresContext->GetPresShell();
nsIScrollableFrame* scrollframe = shell->GetRootScrollFrameAsScrollable();
if (scrollframe) {
pagePoint += CSSIntPoint::FromAppUnitsRounded(scrollframe->GetScrollPosition());
}
}
return pagePoint;
}
// static
CSSIntPoint
Event::GetClientCoords(nsPresContext* aPresContext,
WidgetEvent* aEvent,
LayoutDeviceIntPoint aPoint,
CSSIntPoint aDefaultPoint)
{
if (nsEventStateManager::sIsPointerLocked) {
return nsEventStateManager::sLastClientPoint;
}
if (!aEvent ||
(aEvent->eventStructType != NS_MOUSE_EVENT &&
aEvent->eventStructType != NS_MOUSE_SCROLL_EVENT &&
aEvent->eventStructType != NS_WHEEL_EVENT &&
aEvent->eventStructType != NS_TOUCH_EVENT &&
aEvent->eventStructType != NS_DRAG_EVENT &&
aEvent->eventStructType != NS_POINTER_EVENT &&
aEvent->eventStructType != NS_SIMPLE_GESTURE_EVENT) ||
!aPresContext ||
!aEvent->AsGUIEvent()->widget) {
return aDefaultPoint;
}
nsIPresShell* shell = aPresContext->GetPresShell();
if (!shell) {
return CSSIntPoint(0, 0);
}
nsIFrame* rootFrame = shell->GetRootFrame();
if (!rootFrame) {
return CSSIntPoint(0, 0);
}
nsPoint pt =
nsLayoutUtils::GetEventCoordinatesRelativeTo(aEvent,
LayoutDeviceIntPoint::ToUntyped(aPoint), rootFrame);
return CSSIntPoint::FromAppUnitsRounded(pt);
}
// To be called ONLY by Event::GetType (which has the additional
// logic for handling user-defined events).
// static
const char*
Event::GetEventName(uint32_t aEventType)
{
switch(aEventType) {
#define ID_TO_EVENT(name_, _id, _type, _struct) \
case _id: return #name_;
#include "nsEventNameList.h"
#undef ID_TO_EVENT
default:
break;
}
// XXXldb We can hit this case for WidgetEvent objects that we didn't
// create and that are not user defined events since this function and
// SetEventType are incomplete. (But fixing that requires fixing the
// arrays in nsEventListenerManager too, since the events for which
// this is a problem generally *are* created by Event.)
return nullptr;
}
bool
Event::DefaultPrevented(JSContext* aCx) const
{
MOZ_ASSERT(aCx, "JS context must be specified");
NS_ENSURE_TRUE(mEvent, false);
// If preventDefault() has never been called, just return false.
if (!mEvent->mFlags.mDefaultPrevented) {
return false;
}
// If preventDefault() has been called by content, return true. Otherwise,
// i.e., preventDefault() has been called by chrome, return true only when
// this is called by chrome.
return mEvent->mFlags.mDefaultPreventedByContent || IsChrome(aCx);
}
bool
Event::GetPreventDefault() const
{
if (mOwner) {
if (nsIDocument* doc = mOwner->GetExtantDoc()) {
doc->WarnOnceAbout(nsIDocument::eGetPreventDefault);
}
}
// GetPreventDefault() is legacy and Gecko specific method. Although,
// the result should be same as defaultPrevented, we don't need to break
// backward compatibility of legacy method. Let's behave traditionally.
return DefaultPrevented();
}
NS_IMETHODIMP
Event::GetPreventDefault(bool* aReturn)
{
NS_ENSURE_ARG_POINTER(aReturn);
*aReturn = GetPreventDefault();
return NS_OK;
}
NS_IMETHODIMP
Event::GetDefaultPrevented(bool* aReturn)
{
NS_ENSURE_ARG_POINTER(aReturn);
// This method must be called by only event handlers implemented by C++.
// Then, the handlers must handle default action. So, this method don't need
// to check if preventDefault() has been called by content or chrome.
*aReturn = DefaultPrevented();
return NS_OK;
}
NS_IMETHODIMP_(void)
Event::Serialize(IPC::Message* aMsg, bool aSerializeInterfaceType)
{
if (aSerializeInterfaceType) {
IPC::WriteParam(aMsg, NS_LITERAL_STRING("event"));
}
nsString type;
GetType(type);
IPC::WriteParam(aMsg, type);
IPC::WriteParam(aMsg, Bubbles());
IPC::WriteParam(aMsg, Cancelable());
IPC::WriteParam(aMsg, IsTrusted());
// No timestamp serialization for now!
}
NS_IMETHODIMP_(bool)
Event::Deserialize(const IPC::Message* aMsg, void** aIter)
{
nsString type;
NS_ENSURE_TRUE(IPC::ReadParam(aMsg, aIter, &type), false);
bool bubbles = false;
NS_ENSURE_TRUE(IPC::ReadParam(aMsg, aIter, &bubbles), false);
bool cancelable = false;
NS_ENSURE_TRUE(IPC::ReadParam(aMsg, aIter, &cancelable), false);
bool trusted = false;
NS_ENSURE_TRUE(IPC::ReadParam(aMsg, aIter, &trusted), false);
nsresult rv = InitEvent(type, bubbles, cancelable);
NS_ENSURE_SUCCESS(rv, false);
SetTrusted(trusted);
return true;
}
NS_IMETHODIMP_(void)
Event::SetOwner(mozilla::dom::EventTarget* aOwner)
{
mOwner = nullptr;
if (!aOwner) {
return;
}
nsCOMPtr<nsINode> n = do_QueryInterface(aOwner);
if (n) {
mOwner = do_QueryInterface(n->OwnerDoc()->GetScopeObject());
return;
}
nsCOMPtr<nsPIDOMWindow> w = do_QueryInterface(aOwner);
if (w) {
if (w->IsOuterWindow()) {
mOwner = w->GetCurrentInnerWindow();
} else {
mOwner.swap(w);
}
return;
}
nsCOMPtr<nsDOMEventTargetHelper> eth = do_QueryInterface(aOwner);
if (eth) {
mOwner = eth->GetOwner();
return;
}
#ifdef DEBUG
nsCOMPtr<nsPIWindowRoot> root = do_QueryInterface(aOwner);
MOZ_ASSERT(root, "Unexpected EventTarget!");
#endif
}
} // namespace dom
} // namespace mozilla
using namespace mozilla;
using namespace mozilla::dom;
nsresult
NS_NewDOMEvent(nsIDOMEvent** aInstancePtrResult,
EventTarget* aOwner,
nsPresContext* aPresContext,
WidgetEvent* aEvent)
{
Event* it = new Event(aOwner, aPresContext, aEvent);
NS_ADDREF(it);
*aInstancePtrResult = static_cast<Event*>(it);
return NS_OK;
}
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