gecko-dev/widget/TextEventDispatcher.cpp

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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 "mozilla/Preferences.h"
#include "mozilla/TextEvents.h"
#include "mozilla/TextEventDispatcher.h"
#include "nsIDocShell.h"
#include "nsIFrame.h"
#include "nsIPresShell.h"
#include "nsIWidget.h"
#include "nsPIDOMWindow.h"
#include "nsView.h"
namespace mozilla {
namespace widget {
/******************************************************************************
* TextEventDispatcher
*****************************************************************************/
bool TextEventDispatcher::sDispatchKeyEventsDuringComposition = false;
TextEventDispatcher::TextEventDispatcher(nsIWidget* aWidget)
: mWidget(aWidget)
, mDispatchingEvent(0)
, mForTests(false)
, mIsComposing(false)
{
MOZ_RELEASE_ASSERT(mWidget, "aWidget must not be nullptr");
static bool sInitialized = false;
if (!sInitialized) {
Preferences::AddBoolVarCache(
&sDispatchKeyEventsDuringComposition,
"dom.keyboardevent.dispatch_during_composition",
false);
sInitialized = true;
}
}
nsresult
TextEventDispatcher::BeginInputTransaction(
TextEventDispatcherListener* aListener)
{
return BeginInputTransactionInternal(aListener, false);
}
nsresult
TextEventDispatcher::BeginInputTransactionForTests(
TextEventDispatcherListener* aListener)
{
return BeginInputTransactionInternal(aListener, true);
}
nsresult
TextEventDispatcher::BeginInputTransactionInternal(
TextEventDispatcherListener* aListener,
bool aForTests)
{
if (NS_WARN_IF(!aListener)) {
return NS_ERROR_INVALID_ARG;
}
nsCOMPtr<TextEventDispatcherListener> listener = do_QueryReferent(mListener);
if (listener) {
if (listener == aListener && mForTests == aForTests) {
return NS_OK;
}
// If this has composition or is dispatching an event, any other listener
// can steal ownership. Especially, if the latter case is allowed,
// nobody cannot begin input transaction with this if a modal dialog is
// opened during dispatching an event.
if (IsComposing() || IsDispatchingEvent()) {
return NS_ERROR_ALREADY_INITIALIZED;
}
}
mListener = do_GetWeakReference(aListener);
mForTests = aForTests;
if (listener && listener != aListener) {
listener->OnRemovedFrom(this);
}
return NS_OK;
}
void
TextEventDispatcher::OnDestroyWidget()
{
mWidget = nullptr;
mPendingComposition.Clear();
nsCOMPtr<TextEventDispatcherListener> listener = do_QueryReferent(mListener);
mListener = nullptr;
if (listener) {
listener->OnRemovedFrom(this);
}
}
nsresult
TextEventDispatcher::GetState() const
{
nsCOMPtr<TextEventDispatcherListener> listener = do_QueryReferent(mListener);
if (!listener) {
return NS_ERROR_NOT_INITIALIZED;
}
if (!mWidget || mWidget->Destroyed()) {
return NS_ERROR_NOT_AVAILABLE;
}
return NS_OK;
}
void
TextEventDispatcher::InitEvent(WidgetGUIEvent& aEvent) const
{
aEvent.time = PR_IntervalNow();
aEvent.refPoint = LayoutDeviceIntPoint(0, 0);
aEvent.mFlags.mIsSynthesizedForTests = mForTests;
}
nsresult
TextEventDispatcher::DispatchEvent(nsIWidget* aWidget,
WidgetGUIEvent& aEvent,
nsEventStatus& aStatus)
{
nsRefPtr<TextEventDispatcher> kungFuDeathGrip(this);
nsCOMPtr<nsIWidget> widget(aWidget);
mDispatchingEvent++;
nsresult rv = NS_OK;
if (aEvent.AsInputEvent() &&
(!aEvent.mFlags.mIsSynthesizedForTests || gfxPrefs::TestEventsAsyncEnabled()))
{
aStatus = widget->DispatchInputEvent(aEvent.AsInputEvent());
} else {
rv = widget->DispatchEvent(&aEvent, aStatus);
}
mDispatchingEvent--;
return rv;
}
nsresult
TextEventDispatcher::StartComposition(nsEventStatus& aStatus)
{
aStatus = nsEventStatus_eIgnore;
nsresult rv = GetState();
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
if (NS_WARN_IF(mIsComposing)) {
return NS_ERROR_FAILURE;
}
mIsComposing = true;
WidgetCompositionEvent compositionStartEvent(true, NS_COMPOSITION_START,
mWidget);
InitEvent(compositionStartEvent);
rv = DispatchEvent(mWidget, compositionStartEvent, aStatus);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
return NS_OK;
}
nsresult
TextEventDispatcher::StartCompositionAutomaticallyIfNecessary(
nsEventStatus& aStatus)
{
if (IsComposing()) {
return NS_OK;
}
nsresult rv = StartComposition(aStatus);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
// If started composition has already been committed, we shouldn't dispatch
// the compositionchange event.
if (!IsComposing()) {
aStatus = nsEventStatus_eConsumeNoDefault;
return NS_OK;
}
// Note that the widget might be destroyed during a call of
// StartComposition(). In such case, we shouldn't keep dispatching next
// event.
rv = GetState();
if (NS_FAILED(rv)) {
MOZ_ASSERT(rv != NS_ERROR_NOT_INITIALIZED,
"aDispatcher must still be initialized in this case");
aStatus = nsEventStatus_eConsumeNoDefault;
return NS_OK; // Don't throw exception in this case
}
aStatus = nsEventStatus_eIgnore;
return NS_OK;
}
nsresult
TextEventDispatcher::CommitComposition(nsEventStatus& aStatus,
const nsAString* aCommitString)
{
aStatus = nsEventStatus_eIgnore;
nsresult rv = GetState();
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
// When there is no composition, caller shouldn't try to commit composition
// with non-existing composition string nor commit composition with empty
// string.
if (NS_WARN_IF(!IsComposing() &&
(!aCommitString || aCommitString->IsEmpty()))) {
return NS_ERROR_FAILURE;
}
nsCOMPtr<nsIWidget> widget(mWidget);
rv = StartCompositionAutomaticallyIfNecessary(aStatus);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
if (aStatus == nsEventStatus_eConsumeNoDefault) {
return NS_OK;
}
// End current composition and make this free for other IMEs.
mIsComposing = false;
uint32_t message = aCommitString ? NS_COMPOSITION_COMMIT :
NS_COMPOSITION_COMMIT_AS_IS;
WidgetCompositionEvent compositionCommitEvent(true, message, widget);
InitEvent(compositionCommitEvent);
if (message == NS_COMPOSITION_COMMIT) {
compositionCommitEvent.mData = *aCommitString;
}
rv = DispatchEvent(widget, compositionCommitEvent, aStatus);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
return NS_OK;
}
nsresult
TextEventDispatcher::NotifyIME(const IMENotification& aIMENotification)
{
nsCOMPtr<TextEventDispatcherListener> listener = do_QueryReferent(mListener);
if (!listener) {
return NS_ERROR_NOT_IMPLEMENTED;
}
nsresult rv = listener->NotifyIME(this, aIMENotification);
// If the listener isn't available, it means that it cannot handle the
// notification or request for now. In this case, we should return
// NS_ERROR_NOT_IMPLEMENTED because it's not implemented at such moment.
if (rv == NS_ERROR_NOT_AVAILABLE) {
return NS_ERROR_NOT_IMPLEMENTED;
}
return rv;
}
bool
TextEventDispatcher::DispatchKeyboardEvent(
uint32_t aMessage,
const WidgetKeyboardEvent& aKeyboardEvent,
nsEventStatus& aStatus)
{
return DispatchKeyboardEventInternal(aMessage, aKeyboardEvent, aStatus);
}
bool
TextEventDispatcher::DispatchKeyboardEventInternal(
uint32_t aMessage,
const WidgetKeyboardEvent& aKeyboardEvent,
nsEventStatus& aStatus,
uint32_t aIndexOfKeypress)
{
MOZ_ASSERT(aMessage == NS_KEY_DOWN || aMessage == NS_KEY_UP ||
aMessage == NS_KEY_PRESS, "Invalid aMessage value");
nsresult rv = GetState();
if (NS_WARN_IF(NS_FAILED(rv))) {
return false;
}
// If the key shouldn't cause keypress events, don't this patch them.
if (aMessage == NS_KEY_PRESS && !aKeyboardEvent.ShouldCauseKeypressEvents()) {
return false;
}
// Basically, key events shouldn't be dispatched during composition.
if (IsComposing()) {
// However, if we need to behave like other browsers, we need the keydown
// and keyup events. Note that this behavior is also allowed by D3E spec.
// FYI: keypress events must not be fired during composition.
if (!sDispatchKeyEventsDuringComposition || aMessage == NS_KEY_PRESS) {
return false;
}
// XXX If there was mOnlyContentDispatch for this case, it might be useful
// because our chrome doesn't assume that key events are fired during
// composition.
}
WidgetKeyboardEvent keyEvent(true, aMessage, mWidget);
InitEvent(keyEvent);
keyEvent.AssignKeyEventData(aKeyboardEvent, false);
if (aStatus == nsEventStatus_eConsumeNoDefault) {
// If the key event should be dispatched as consumed event, marking it here.
// This is useful to prevent double action. E.g., when the key was already
// handled by system, our chrome shouldn't handle it.
keyEvent.mFlags.mDefaultPrevented = true;
}
// Corrects each member for the specific key event type.
if (aMessage == NS_KEY_DOWN || aMessage == NS_KEY_UP) {
MOZ_ASSERT(!aIndexOfKeypress,
"aIndexOfKeypress must be 0 for either NS_KEY_DOWN or NS_KEY_UP");
// charCode of keydown and keyup should be 0.
keyEvent.charCode = 0;
} else if (keyEvent.mKeyNameIndex != KEY_NAME_INDEX_USE_STRING) {
MOZ_ASSERT(!aIndexOfKeypress,
"aIndexOfKeypress must be 0 for NS_KEY_PRESS of non-printable key");
// If keypress event isn't caused by printable key, its charCode should
// be 0.
keyEvent.charCode = 0;
} else {
MOZ_RELEASE_ASSERT(
!aIndexOfKeypress || aIndexOfKeypress < keyEvent.mKeyValue.Length(),
"aIndexOfKeypress must be 0 - mKeyValue.Length() - 1");
keyEvent.keyCode = 0;
wchar_t ch =
keyEvent.mKeyValue.IsEmpty() ? 0 : keyEvent.mKeyValue[aIndexOfKeypress];
keyEvent.charCode = static_cast<uint32_t>(ch);
if (ch) {
keyEvent.mKeyValue.Assign(ch);
} else {
keyEvent.mKeyValue.Truncate();
}
}
if (aMessage == NS_KEY_UP) {
// mIsRepeat of keyup event must be false.
keyEvent.mIsRepeat = false;
}
// mIsComposing should be initialized later.
keyEvent.mIsComposing = false;
// XXX Currently, we don't support to dispatch key event with native key
// event information.
keyEvent.mNativeKeyEvent = nullptr;
// XXX Currently, we don't support to dispatch key events with data for
// plugins.
keyEvent.mPluginEvent.Clear();
// TODO: Manage mUniqueId here.
DispatchEvent(mWidget, keyEvent, aStatus);
return true;
}
bool
TextEventDispatcher::MaybeDispatchKeypressEvents(
const WidgetKeyboardEvent& aKeyboardEvent,
nsEventStatus& aStatus)
{
// If the key event was consumed, keypress event shouldn't be fired.
if (aStatus == nsEventStatus_eConsumeNoDefault) {
return false;
}
// If the key isn't a printable key or just inputting one character or
// no character, we should dispatch only one keypress. Otherwise, i.e.,
// if the key is a printable key and inputs multiple characters, keypress
// event should be dispatched the count of inputting characters times.
size_t keypressCount =
aKeyboardEvent.mKeyNameIndex != KEY_NAME_INDEX_USE_STRING ?
1 : std::max(static_cast<nsAString::size_type>(1),
aKeyboardEvent.mKeyValue.Length());
bool isDispatched = false;
bool consumed = false;
for (size_t i = 0; i < keypressCount; i++) {
aStatus = nsEventStatus_eIgnore;
if (!DispatchKeyboardEventInternal(NS_KEY_PRESS, aKeyboardEvent,
aStatus, i)) {
// The widget must have been gone.
break;
}
isDispatched = true;
if (!consumed) {
consumed = (aStatus == nsEventStatus_eConsumeNoDefault);
}
}
// If one of the keypress event was consumed, return ConsumeNoDefault.
if (consumed) {
aStatus = nsEventStatus_eConsumeNoDefault;
}
return isDispatched;
}
/******************************************************************************
* TextEventDispatcher::PendingComposition
*****************************************************************************/
TextEventDispatcher::PendingComposition::PendingComposition()
{
Clear();
}
void
TextEventDispatcher::PendingComposition::Clear()
{
mString.Truncate();
mClauses = nullptr;
mCaret.mRangeType = 0;
}
void
TextEventDispatcher::PendingComposition::EnsureClauseArray()
{
if (mClauses) {
return;
}
mClauses = new TextRangeArray();
}
nsresult
TextEventDispatcher::PendingComposition::SetString(const nsAString& aString)
{
mString = aString;
return NS_OK;
}
nsresult
TextEventDispatcher::PendingComposition::AppendClause(uint32_t aLength,
uint32_t aAttribute)
{
if (NS_WARN_IF(!aLength)) {
return NS_ERROR_INVALID_ARG;
}
switch (aAttribute) {
case NS_TEXTRANGE_RAWINPUT:
case NS_TEXTRANGE_SELECTEDRAWTEXT:
case NS_TEXTRANGE_CONVERTEDTEXT:
case NS_TEXTRANGE_SELECTEDCONVERTEDTEXT: {
EnsureClauseArray();
TextRange textRange;
textRange.mStartOffset =
mClauses->IsEmpty() ? 0 : mClauses->LastElement().mEndOffset;
textRange.mEndOffset = textRange.mStartOffset + aLength;
textRange.mRangeType = aAttribute;
mClauses->AppendElement(textRange);
return NS_OK;
}
default:
return NS_ERROR_INVALID_ARG;
}
}
nsresult
TextEventDispatcher::PendingComposition::SetCaret(uint32_t aOffset,
uint32_t aLength)
{
mCaret.mStartOffset = aOffset;
mCaret.mEndOffset = mCaret.mStartOffset + aLength;
mCaret.mRangeType = NS_TEXTRANGE_CARETPOSITION;
return NS_OK;
}
nsresult
TextEventDispatcher::PendingComposition::Flush(TextEventDispatcher* aDispatcher,
nsEventStatus& aStatus)
{
aStatus = nsEventStatus_eIgnore;
nsresult rv = aDispatcher->GetState();
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
if (mClauses && !mClauses->IsEmpty() &&
mClauses->LastElement().mEndOffset != mString.Length()) {
NS_WARNING("Sum of length of the all clauses must be same as the string "
"length");
Clear();
return NS_ERROR_ILLEGAL_VALUE;
}
if (mCaret.mRangeType == NS_TEXTRANGE_CARETPOSITION) {
if (mCaret.mEndOffset > mString.Length()) {
NS_WARNING("Caret position is out of the composition string");
Clear();
return NS_ERROR_ILLEGAL_VALUE;
}
EnsureClauseArray();
mClauses->AppendElement(mCaret);
}
nsRefPtr<TextEventDispatcher> kungFuDeathGrip(aDispatcher);
nsCOMPtr<nsIWidget> widget(aDispatcher->mWidget);
WidgetCompositionEvent compChangeEvent(true, NS_COMPOSITION_CHANGE, widget);
aDispatcher->InitEvent(compChangeEvent);
compChangeEvent.mData = mString;
if (mClauses) {
MOZ_ASSERT(!mClauses->IsEmpty(),
"mClauses must be non-empty array when it's not nullptr");
compChangeEvent.mRanges = mClauses;
}
// While this method dispatches a composition event, some other event handler
// cause more clauses to be added. So, we should clear pending composition
// before dispatching the event.
Clear();
rv = aDispatcher->StartCompositionAutomaticallyIfNecessary(aStatus);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
if (aStatus == nsEventStatus_eConsumeNoDefault) {
return NS_OK;
}
rv = aDispatcher->DispatchEvent(widget, compChangeEvent, aStatus);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
return NS_OK;
}
} // namespace widget
} // namespace mozilla