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ContentEventHandler.cpp
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ContentEventHandler.cpp
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/* -*- 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/. */
#include "ContentEventHandler.h"
#include "mozilla/IMEStateManager.h"
#include "mozilla/TextEvents.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/Selection.h"
#include "nsCaret.h"
#include "nsCOMPtr.h"
#include "nsContentUtils.h"
#include "nsCopySupport.h"
#include "nsFocusManager.h"
#include "nsFontMetrics.h"
#include "nsFrameSelection.h"
#include "nsIContentIterator.h"
#include "nsIPresShell.h"
#include "nsISelection.h"
#include "nsISelectionController.h"
#include "nsIFrame.h"
#include "nsIObjectFrame.h"
#include "nsLayoutUtils.h"
#include "nsPresContext.h"
#include "nsRange.h"
#include "nsTextFragment.h"
#include "nsTextFrame.h"
#include "nsView.h"
#include <algorithm>
namespace mozilla {
using namespace dom;
using namespace widget;
/******************************************************************/
/* ContentEventHandler */
/******************************************************************/
ContentEventHandler::ContentEventHandler(nsPresContext* aPresContext)
: mPresContext(aPresContext)
, mPresShell(aPresContext->GetPresShell())
, mSelection(nullptr)
, mFirstSelectedRange(nullptr)
, mRootContent(nullptr)
{
}
nsresult
ContentEventHandler::InitBasic()
{
NS_ENSURE_TRUE(mPresShell, NS_ERROR_NOT_AVAILABLE);
// If text frame which has overflowing selection underline is dirty,
// we need to flush the pending reflow here.
mPresShell->FlushPendingNotifications(Flush_Layout);
// Flushing notifications can cause mPresShell to be destroyed (bug 577963).
NS_ENSURE_TRUE(!mPresShell->IsDestroying(), NS_ERROR_FAILURE);
return NS_OK;
}
nsresult
ContentEventHandler::InitCommon()
{
if (mSelection) {
return NS_OK;
}
nsresult rv = InitBasic();
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsISelection> sel;
nsCopySupport::GetSelectionForCopy(mPresShell->GetDocument(),
getter_AddRefs(sel));
mSelection = static_cast<Selection*>(sel.get());
if (NS_WARN_IF(!mSelection)) {
return NS_ERROR_NOT_AVAILABLE;
}
if (!mSelection->RangeCount()) {
// If there is no selection range, we should compute the selection root
// from ancestor limiter or root content of the document.
rv = mSelection->GetAncestorLimiter(getter_AddRefs(mRootContent));
if (NS_WARN_IF(NS_FAILED(rv))) {
return NS_ERROR_FAILURE;
}
if (!mRootContent) {
mRootContent = mPresShell->GetDocument()->GetRootElement();
if (NS_WARN_IF(!mRootContent)) {
return NS_ERROR_NOT_AVAILABLE;
}
}
// Assume that there is selection at beginning of the root content.
rv = nsRange::CreateRange(mRootContent, 0, mRootContent, 0,
getter_AddRefs(mFirstSelectedRange));
if (NS_WARN_IF(NS_FAILED(rv)) || NS_WARN_IF(!mFirstSelectedRange)) {
return NS_ERROR_UNEXPECTED;
}
return NS_OK;
}
mFirstSelectedRange = mSelection->GetRangeAt(0);
if (NS_WARN_IF(!mFirstSelectedRange)) {
return NS_ERROR_UNEXPECTED;
}
// If there is a selection, we should retrieve the selection root from
// the range since when the window is inactivated, the ancestor limiter
// of mSelection was cleared by blur event handler of nsEditor but the
// selection range still keeps storing the nodes. If the active element of
// the deactive window is <input> or <textarea>, we can compute the selection
// root from them.
nsINode* startNode = mFirstSelectedRange->GetStartParent();
NS_ENSURE_TRUE(startNode, NS_ERROR_FAILURE);
nsINode* endNode = mFirstSelectedRange->GetEndParent();
NS_ENSURE_TRUE(endNode, NS_ERROR_FAILURE);
// See bug 537041 comment 5, the range could have removed node.
NS_ENSURE_TRUE(startNode->GetCurrentDoc() == mPresShell->GetDocument(),
NS_ERROR_NOT_AVAILABLE);
NS_ASSERTION(startNode->GetCurrentDoc() == endNode->GetCurrentDoc(),
"mFirstSelectedRange crosses the document boundary");
mRootContent = startNode->GetSelectionRootContent(mPresShell);
NS_ENSURE_TRUE(mRootContent, NS_ERROR_FAILURE);
return NS_OK;
}
nsresult
ContentEventHandler::Init(WidgetQueryContentEvent* aEvent)
{
NS_ASSERTION(aEvent, "aEvent must not be null");
nsresult rv = InitCommon();
NS_ENSURE_SUCCESS(rv, rv);
aEvent->mSucceeded = false;
aEvent->mReply.mContentsRoot = mRootContent.get();
aEvent->mReply.mHasSelection = !mSelection->IsCollapsed();
nsRect r;
nsIFrame* frame = nsCaret::GetGeometry(mSelection, &r);
if (!frame) {
frame = mRootContent->GetPrimaryFrame();
if (NS_WARN_IF(!frame)) {
return NS_ERROR_FAILURE;
}
}
aEvent->mReply.mFocusedWidget = frame->GetNearestWidget();
return NS_OK;
}
nsresult
ContentEventHandler::Init(WidgetSelectionEvent* aEvent)
{
NS_ASSERTION(aEvent, "aEvent must not be null");
nsresult rv = InitCommon();
NS_ENSURE_SUCCESS(rv, rv);
aEvent->mSucceeded = false;
return NS_OK;
}
nsIContent*
ContentEventHandler::GetFocusedContent()
{
nsIDocument* doc = mPresShell->GetDocument();
if (!doc) {
return nullptr;
}
nsCOMPtr<nsPIDOMWindow> window = do_QueryInterface(doc->GetWindow());
nsCOMPtr<nsPIDOMWindow> focusedWindow;
return nsFocusManager::GetFocusedDescendant(window, true,
getter_AddRefs(focusedWindow));
}
bool
ContentEventHandler::IsPlugin(nsIContent* aContent)
{
return aContent &&
aContent->GetDesiredIMEState().mEnabled == IMEState::PLUGIN;
}
nsresult
ContentEventHandler::QueryContentRect(nsIContent* aContent,
WidgetQueryContentEvent* aEvent)
{
NS_PRECONDITION(aContent, "aContent must not be null");
nsIFrame* frame = aContent->GetPrimaryFrame();
NS_ENSURE_TRUE(frame, NS_ERROR_FAILURE);
// get rect for first frame
nsRect resultRect(nsPoint(0, 0), frame->GetRect().Size());
nsresult rv = ConvertToRootRelativeOffset(frame, resultRect);
NS_ENSURE_SUCCESS(rv, rv);
// account for any additional frames
while ((frame = frame->GetNextContinuation()) != nullptr) {
nsRect frameRect(nsPoint(0, 0), frame->GetRect().Size());
rv = ConvertToRootRelativeOffset(frame, frameRect);
NS_ENSURE_SUCCESS(rv, rv);
resultRect.UnionRect(resultRect, frameRect);
}
aEvent->mReply.mRect = LayoutDevicePixel::FromUntyped(
resultRect.ToOutsidePixels(mPresContext->AppUnitsPerDevPixel()));
aEvent->mSucceeded = true;
return NS_OK;
}
// Editor places a bogus BR node under its root content if the editor doesn't
// have any text. This happens even for single line editors.
// When we get text content and when we change the selection,
// we don't want to include the bogus BRs at the end.
static bool IsContentBR(nsIContent* aContent)
{
return aContent->IsHTMLElement(nsGkAtoms::br) &&
!aContent->AttrValueIs(kNameSpaceID_None,
nsGkAtoms::type,
nsGkAtoms::moz,
eIgnoreCase) &&
!aContent->AttrValueIs(kNameSpaceID_None,
nsGkAtoms::mozeditorbogusnode,
nsGkAtoms::_true,
eIgnoreCase);
}
static void ConvertToNativeNewlines(nsAFlatString& aString)
{
#if defined(XP_WIN)
aString.ReplaceSubstring(NS_LITERAL_STRING("\n"), NS_LITERAL_STRING("\r\n"));
#endif
}
static void AppendString(nsAString& aString, nsIContent* aContent)
{
NS_ASSERTION(aContent->IsNodeOfType(nsINode::eTEXT),
"aContent is not a text node!");
const nsTextFragment* text = aContent->GetText();
if (!text) {
return;
}
text->AppendTo(aString);
}
static void AppendSubString(nsAString& aString, nsIContent* aContent,
uint32_t aXPOffset, uint32_t aXPLength)
{
NS_ASSERTION(aContent->IsNodeOfType(nsINode::eTEXT),
"aContent is not a text node!");
const nsTextFragment* text = aContent->GetText();
if (!text) {
return;
}
text->AppendTo(aString, int32_t(aXPOffset), int32_t(aXPLength));
}
#if defined(XP_WIN)
static uint32_t CountNewlinesInXPLength(nsIContent* aContent,
uint32_t aXPLength)
{
NS_ASSERTION(aContent->IsNodeOfType(nsINode::eTEXT),
"aContent is not a text node!");
const nsTextFragment* text = aContent->GetText();
if (!text) {
return 0;
}
// For automated tests, we should abort on debug build.
MOZ_ASSERT(aXPLength == UINT32_MAX || aXPLength <= text->GetLength(),
"aXPLength is out-of-bounds");
const uint32_t length = std::min(aXPLength, text->GetLength());
uint32_t newlines = 0;
for (uint32_t i = 0; i < length; ++i) {
if (text->CharAt(i) == '\n') {
++newlines;
}
}
return newlines;
}
static uint32_t CountNewlinesInNativeLength(nsIContent* aContent,
uint32_t aNativeLength)
{
NS_ASSERTION(aContent->IsNodeOfType(nsINode::eTEXT),
"aContent is not a text node!");
const nsTextFragment* text = aContent->GetText();
if (!text) {
return 0;
}
// For automated tests, we should abort on debug build.
MOZ_ASSERT(
(aNativeLength == UINT32_MAX || aNativeLength <= text->GetLength() * 2),
"aNativeLength is unexpected value");
const uint32_t xpLength = text->GetLength();
uint32_t newlines = 0;
for (uint32_t i = 0, nativeOffset = 0;
i < xpLength && nativeOffset < aNativeLength;
++i, ++nativeOffset) {
// For automated tests, we should abort on debug build.
MOZ_ASSERT(i < text->GetLength(), "i is out-of-bounds");
if (text->CharAt(i) == '\n') {
++newlines;
++nativeOffset;
}
}
return newlines;
}
#endif
/* static */ uint32_t
ContentEventHandler::GetNativeTextLength(nsIContent* aContent,
uint32_t aStartOffset,
uint32_t aEndOffset)
{
MOZ_ASSERT(aEndOffset >= aStartOffset,
"aEndOffset must be equals or larger than aStartOffset");
if (aStartOffset == aEndOffset) {
return 0;
}
return GetTextLength(aContent, LINE_BREAK_TYPE_NATIVE, aEndOffset) -
GetTextLength(aContent, LINE_BREAK_TYPE_NATIVE, aStartOffset);
}
/* static */ uint32_t
ContentEventHandler::GetNativeTextLength(nsIContent* aContent,
uint32_t aMaxLength)
{
return GetTextLength(aContent, LINE_BREAK_TYPE_NATIVE, aMaxLength);
}
static inline uint32_t
GetBRLength(LineBreakType aLineBreakType)
{
#if defined(XP_WIN)
// Length of \r\n
return (aLineBreakType == LINE_BREAK_TYPE_NATIVE) ? 2 : 1;
#else
return 1;
#endif
}
/* static */ uint32_t
ContentEventHandler::GetTextLength(nsIContent* aContent,
LineBreakType aLineBreakType,
uint32_t aMaxLength)
{
if (aContent->IsNodeOfType(nsINode::eTEXT)) {
uint32_t textLengthDifference =
#if defined(XP_WIN)
// On Windows, the length of a native newline ("\r\n") is twice the length
// of the XP newline ("\n"), so XP length is equal to the length of the
// native offset plus the number of newlines encountered in the string.
(aLineBreakType == LINE_BREAK_TYPE_NATIVE) ?
CountNewlinesInXPLength(aContent, aMaxLength) : 0;
#else
// On other platforms, the native and XP newlines are the same.
0;
#endif
const nsTextFragment* text = aContent->GetText();
if (!text) {
return 0;
}
uint32_t length = std::min(text->GetLength(), aMaxLength);
return length + textLengthDifference;
} else if (IsContentBR(aContent)) {
return GetBRLength(aLineBreakType);
}
return 0;
}
static uint32_t ConvertToXPOffset(nsIContent* aContent, uint32_t aNativeOffset)
{
#if defined(XP_WIN)
// On Windows, the length of a native newline ("\r\n") is twice the length of
// the XP newline ("\n"), so XP offset is equal to the length of the native
// offset minus the number of newlines encountered in the string.
return aNativeOffset - CountNewlinesInNativeLength(aContent, aNativeOffset);
#else
// On other platforms, the native and XP newlines are the same.
return aNativeOffset;
#endif
}
static nsresult GenerateFlatTextContent(nsRange* aRange,
nsAFlatString& aString,
LineBreakType aLineBreakType)
{
nsCOMPtr<nsIContentIterator> iter = NS_NewContentIterator();
iter->Init(aRange);
NS_ASSERTION(aString.IsEmpty(), "aString must be empty string");
nsINode* startNode = aRange->GetStartParent();
NS_ENSURE_TRUE(startNode, NS_ERROR_FAILURE);
nsINode* endNode = aRange->GetEndParent();
NS_ENSURE_TRUE(endNode, NS_ERROR_FAILURE);
if (startNode == endNode && startNode->IsNodeOfType(nsINode::eTEXT)) {
nsIContent* content = static_cast<nsIContent*>(startNode);
AppendSubString(aString, content, aRange->StartOffset(),
aRange->EndOffset() - aRange->StartOffset());
ConvertToNativeNewlines(aString);
return NS_OK;
}
for (; !iter->IsDone(); iter->Next()) {
nsINode* node = iter->GetCurrentNode();
if (!node) {
break;
}
if (!node->IsNodeOfType(nsINode::eCONTENT)) {
continue;
}
nsIContent* content = static_cast<nsIContent*>(node);
if (content->IsNodeOfType(nsINode::eTEXT)) {
if (content == startNode) {
AppendSubString(aString, content, aRange->StartOffset(),
content->TextLength() - aRange->StartOffset());
} else if (content == endNode) {
AppendSubString(aString, content, 0, aRange->EndOffset());
} else {
AppendString(aString, content);
}
} else if (IsContentBR(content)) {
aString.Append(char16_t('\n'));
}
}
if (aLineBreakType == LINE_BREAK_TYPE_NATIVE) {
ConvertToNativeNewlines(aString);
}
return NS_OK;
}
static FontRange*
AppendFontRange(nsTArray<FontRange>& aFontRanges, uint32_t aBaseOffset)
{
FontRange* fontRange = aFontRanges.AppendElement();
fontRange->mStartOffset = aBaseOffset;
return fontRange;
}
/* static */ uint32_t
ContentEventHandler::GetTextLengthInRange(nsIContent* aContent,
uint32_t aXPStartOffset,
uint32_t aXPEndOffset,
LineBreakType aLineBreakType)
{
return aLineBreakType == LINE_BREAK_TYPE_NATIVE ?
GetNativeTextLength(aContent, aXPStartOffset, aXPEndOffset) :
aXPEndOffset - aXPStartOffset;
}
/* static */ void
ContentEventHandler::AppendFontRanges(FontRangeArray& aFontRanges,
nsIContent* aContent,
int32_t aBaseOffset,
int32_t aXPStartOffset,
int32_t aXPEndOffset,
LineBreakType aLineBreakType)
{
nsIFrame* frame = aContent->GetPrimaryFrame();
if (!frame) {
// It is a non-rendered content, create an empty range for it.
AppendFontRange(aFontRanges, aBaseOffset);
return;
}
int32_t baseOffset = aBaseOffset;
nsTextFrame* curr = do_QueryFrame(frame);
MOZ_ASSERT(curr, "Not a text frame");
while (curr) {
int32_t frameXPStart = std::max(curr->GetContentOffset(), aXPStartOffset);
int32_t frameXPEnd = std::min(curr->GetContentEnd(), aXPEndOffset);
if (frameXPStart >= frameXPEnd) {
curr = static_cast<nsTextFrame*>(curr->GetNextContinuation());
continue;
}
gfxSkipCharsIterator iter = curr->EnsureTextRun(nsTextFrame::eInflated);
gfxTextRun* textRun = curr->GetTextRun(nsTextFrame::eInflated);
nsTextFrame* next = nullptr;
if (frameXPEnd < aXPEndOffset) {
next = static_cast<nsTextFrame*>(curr->GetNextContinuation());
while (next && next->GetTextRun(nsTextFrame::eInflated) == textRun) {
frameXPEnd = std::min(next->GetContentEnd(), aXPEndOffset);
next = frameXPEnd < aXPEndOffset ?
static_cast<nsTextFrame*>(next->GetNextContinuation()) : nullptr;
}
}
uint32_t skipStart = iter.ConvertOriginalToSkipped(frameXPStart);
uint32_t skipEnd = iter.ConvertOriginalToSkipped(frameXPEnd);
gfxTextRun::GlyphRunIterator runIter(
textRun, skipStart, skipEnd - skipStart);
int32_t lastXPEndOffset = frameXPStart;
while (runIter.NextRun()) {
gfxFont* font = runIter.GetGlyphRun()->mFont.get();
int32_t startXPOffset =
iter.ConvertSkippedToOriginal(runIter.GetStringStart());
// It is possible that the first glyph run has exceeded the frame,
// because the whole frame is filled by skipped chars.
if (startXPOffset >= frameXPEnd) {
break;
}
if (startXPOffset > lastXPEndOffset) {
// Create range for skipped leading chars.
AppendFontRange(aFontRanges, baseOffset);
baseOffset += GetTextLengthInRange(
aContent, lastXPEndOffset, startXPOffset, aLineBreakType);
lastXPEndOffset = startXPOffset;
}
FontRange* fontRange = AppendFontRange(aFontRanges, baseOffset);
fontRange->mFontName = font->GetName();
fontRange->mFontSize = font->GetAdjustedSize();
// The converted original offset may exceed the range,
// hence we need to clamp it.
int32_t endXPOffset =
iter.ConvertSkippedToOriginal(runIter.GetStringEnd());
endXPOffset = std::min(frameXPEnd, endXPOffset);
baseOffset += GetTextLengthInRange(aContent, startXPOffset, endXPOffset,
aLineBreakType);
lastXPEndOffset = endXPOffset;
}
if (lastXPEndOffset < frameXPEnd) {
// Create range for skipped trailing chars. It also handles case
// that the whole frame contains only skipped chars.
AppendFontRange(aFontRanges, baseOffset);
baseOffset += GetTextLengthInRange(
aContent, lastXPEndOffset, frameXPEnd, aLineBreakType);
}
curr = next;
}
}
/* static */ nsresult
ContentEventHandler::GenerateFlatFontRanges(nsRange* aRange,
FontRangeArray& aFontRanges,
uint32_t& aLength,
LineBreakType aLineBreakType)
{
MOZ_ASSERT(aFontRanges.IsEmpty(), "aRanges must be empty array");
nsINode* startNode = aRange->GetStartParent();
nsINode* endNode = aRange->GetEndParent();
if (NS_WARN_IF(!startNode || !endNode)) {
return NS_ERROR_FAILURE;
}
// baseOffset is the flattened offset of each content node.
int32_t baseOffset = 0;
nsCOMPtr<nsIContentIterator> iter = NS_NewContentIterator();
for (iter->Init(aRange); !iter->IsDone(); iter->Next()) {
nsINode* node = iter->GetCurrentNode();
if (NS_WARN_IF(!node)) {
break;
}
if (!node->IsContent()) {
continue;
}
nsIContent* content = node->AsContent();
if (content->IsNodeOfType(nsINode::eTEXT)) {
int32_t startOffset = content != startNode ? 0 : aRange->StartOffset();
int32_t endOffset = content != endNode ?
content->TextLength() : aRange->EndOffset();
AppendFontRanges(aFontRanges, content, baseOffset,
startOffset, endOffset, aLineBreakType);
baseOffset += GetTextLengthInRange(content, startOffset, endOffset,
aLineBreakType);
} else if (IsContentBR(content)) {
if (aFontRanges.IsEmpty()) {
MOZ_ASSERT(baseOffset == 0);
FontRange* fontRange = AppendFontRange(aFontRanges, baseOffset);
nsIFrame* frame = content->GetPrimaryFrame();
if (frame) {
const nsFont& font = frame->GetParent()->StyleFont()->mFont;
const FontFamilyList& fontList = font.fontlist;
const FontFamilyName& fontName = fontList.IsEmpty() ?
FontFamilyName(fontList.GetDefaultFontType()) :
fontList.GetFontlist()[0];
fontName.AppendToString(fontRange->mFontName, false);
fontRange->mFontSize =
frame->PresContext()->AppUnitsToDevPixels(font.size);
}
}
baseOffset += GetBRLength(aLineBreakType);
}
}
aLength = baseOffset;
return NS_OK;
}
nsresult
ContentEventHandler::ExpandToClusterBoundary(nsIContent* aContent,
bool aForward,
uint32_t* aXPOffset)
{
// XXX This method assumes that the frame boundaries must be cluster
// boundaries. It's false, but no problem now, maybe.
if (!aContent->IsNodeOfType(nsINode::eTEXT) ||
*aXPOffset == 0 || *aXPOffset == aContent->TextLength()) {
return NS_OK;
}
NS_ASSERTION(*aXPOffset <= aContent->TextLength(),
"offset is out of range.");
RefPtr<nsFrameSelection> fs = mPresShell->FrameSelection();
int32_t offsetInFrame;
CaretAssociationHint hint =
aForward ? CARET_ASSOCIATE_BEFORE : CARET_ASSOCIATE_AFTER;
nsIFrame* frame = fs->GetFrameForNodeOffset(aContent, int32_t(*aXPOffset),
hint, &offsetInFrame);
if (!frame) {
// This content doesn't have any frames, we only can check surrogate pair...
const nsTextFragment* text = aContent->GetText();
NS_ENSURE_TRUE(text, NS_ERROR_FAILURE);
if (NS_IS_LOW_SURROGATE(text->CharAt(*aXPOffset)) &&
NS_IS_HIGH_SURROGATE(text->CharAt(*aXPOffset - 1))) {
*aXPOffset += aForward ? 1 : -1;
}
return NS_OK;
}
int32_t startOffset, endOffset;
nsresult rv = frame->GetOffsets(startOffset, endOffset);
NS_ENSURE_SUCCESS(rv, rv);
if (*aXPOffset == static_cast<uint32_t>(startOffset) ||
*aXPOffset == static_cast<uint32_t>(endOffset)) {
return NS_OK;
}
if (frame->GetType() != nsGkAtoms::textFrame) {
return NS_ERROR_FAILURE;
}
nsTextFrame* textFrame = static_cast<nsTextFrame*>(frame);
int32_t newOffsetInFrame = *aXPOffset - startOffset;
newOffsetInFrame += aForward ? -1 : 1;
textFrame->PeekOffsetCharacter(aForward, &newOffsetInFrame);
*aXPOffset = startOffset + newOffsetInFrame;
return NS_OK;
}
nsresult
ContentEventHandler::SetRangeFromFlatTextOffset(nsRange* aRange,
uint32_t aOffset,
uint32_t aLength,
LineBreakType aLineBreakType,
bool aExpandToClusterBoundaries,
uint32_t* aNewOffset)
{
if (aNewOffset) {
*aNewOffset = aOffset;
}
nsCOMPtr<nsIContentIterator> iter = NS_NewPreContentIterator();
nsresult rv = iter->Init(mRootContent);
NS_ENSURE_SUCCESS(rv, rv);
uint32_t offset = 0;
uint32_t endOffset = aOffset + aLength;
bool startSet = false;
for (; !iter->IsDone(); iter->Next()) {
nsINode* node = iter->GetCurrentNode();
if (!node) {
break;
}
if (!node->IsNodeOfType(nsINode::eCONTENT)) {
continue;
}
nsIContent* content = static_cast<nsIContent*>(node);
uint32_t textLength = GetTextLength(content, aLineBreakType);
if (!textLength) {
continue;
}
if (offset <= aOffset && aOffset < offset + textLength) {
uint32_t xpOffset;
if (!content->IsNodeOfType(nsINode::eTEXT)) {
xpOffset = 0;
} else {
xpOffset = aOffset - offset;
if (aLineBreakType == LINE_BREAK_TYPE_NATIVE) {
xpOffset = ConvertToXPOffset(content, xpOffset);
}
}
if (aExpandToClusterBoundaries) {
uint32_t oldXPOffset = xpOffset;
rv = ExpandToClusterBoundary(content, false, &xpOffset);
NS_ENSURE_SUCCESS(rv, rv);
if (aNewOffset) {
// This is correct since a cluster shouldn't include line break.
*aNewOffset -= (oldXPOffset - xpOffset);
}
}
rv = aRange->SetStart(content, int32_t(xpOffset));
NS_ENSURE_SUCCESS(rv, rv);
startSet = true;
if (aLength == 0) {
// Ensure that the end offset and the start offset are same.
rv = aRange->SetEnd(content, int32_t(xpOffset));
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
}
if (endOffset <= offset + textLength) {
nsINode* endNode = content;
uint32_t xpOffset;
if (content->IsNodeOfType(nsINode::eTEXT)) {
xpOffset = endOffset - offset;
if (aLineBreakType == LINE_BREAK_TYPE_NATIVE) {
xpOffset = ConvertToXPOffset(content, xpOffset);
}
if (aExpandToClusterBoundaries) {
rv = ExpandToClusterBoundary(content, true, &xpOffset);
NS_ENSURE_SUCCESS(rv, rv);
}
} else {
// Use first position of next node, because the end node is ignored
// by ContentIterator when the offset is zero.
xpOffset = 0;
iter->Next();
if (iter->IsDone()) {
break;
}
endNode = iter->GetCurrentNode();
}
rv = aRange->SetEnd(endNode, int32_t(xpOffset));
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
offset += textLength;
}
if (offset < aOffset) {
return NS_ERROR_FAILURE;
}
if (!startSet) {
MOZ_ASSERT(!mRootContent->IsNodeOfType(nsINode::eTEXT));
rv = aRange->SetStart(mRootContent, int32_t(mRootContent->GetChildCount()));
NS_ENSURE_SUCCESS(rv, rv);
if (aNewOffset) {
*aNewOffset = offset;
}
}
rv = aRange->SetEnd(mRootContent, int32_t(mRootContent->GetChildCount()));
NS_ASSERTION(NS_SUCCEEDED(rv), "nsRange::SetEnd failed");
return rv;
}
/* static */ LineBreakType
ContentEventHandler::GetLineBreakType(WidgetQueryContentEvent* aEvent)
{
return GetLineBreakType(aEvent->mUseNativeLineBreak);
}
/* static */ LineBreakType
ContentEventHandler::GetLineBreakType(WidgetSelectionEvent* aEvent)
{
return GetLineBreakType(aEvent->mUseNativeLineBreak);
}
/* static */ LineBreakType
ContentEventHandler::GetLineBreakType(bool aUseNativeLineBreak)
{
return aUseNativeLineBreak ?
LINE_BREAK_TYPE_NATIVE : LINE_BREAK_TYPE_XP;
}
nsresult
ContentEventHandler::HandleQueryContentEvent(WidgetQueryContentEvent* aEvent)
{
switch (aEvent->mMessage) {
case eQuerySelectedText:
return OnQuerySelectedText(aEvent);
case eQueryTextContent:
return OnQueryTextContent(aEvent);
case eQueryCaretRect:
return OnQueryCaretRect(aEvent);
case eQueryTextRect:
return OnQueryTextRect(aEvent);
case eQueryEditorRect:
return OnQueryEditorRect(aEvent);
case eQueryContentState:
return OnQueryContentState(aEvent);
case eQuerySelectionAsTransferable:
return OnQuerySelectionAsTransferable(aEvent);
case eQueryCharacterAtPoint:
return OnQueryCharacterAtPoint(aEvent);
case eQueryDOMWidgetHittest:
return OnQueryDOMWidgetHittest(aEvent);
default:
return NS_ERROR_NOT_IMPLEMENTED;
}
return NS_OK;
}
// Similar to nsFrameSelection::GetFrameForNodeOffset,
// but this is more flexible for OnQueryTextRect to use
static nsresult GetFrameForTextRect(nsINode* aNode,
int32_t aNodeOffset,
bool aHint,
nsIFrame** aReturnFrame)
{
NS_ENSURE_TRUE(aNode && aNode->IsNodeOfType(nsINode::eCONTENT),
NS_ERROR_UNEXPECTED);
nsIContent* content = static_cast<nsIContent*>(aNode);
nsIFrame* frame = content->GetPrimaryFrame();
NS_ENSURE_TRUE(frame, NS_ERROR_FAILURE);
int32_t childNodeOffset = 0;
return frame->GetChildFrameContainingOffset(aNodeOffset, aHint,
&childNodeOffset, aReturnFrame);
}
nsresult
ContentEventHandler::OnQuerySelectedText(WidgetQueryContentEvent* aEvent)
{
nsresult rv = Init(aEvent);
if (NS_FAILED(rv)) {
return rv;
}
NS_ASSERTION(aEvent->mReply.mString.IsEmpty(),
"The reply string must be empty");
LineBreakType lineBreakType = GetLineBreakType(aEvent);
rv = GetFlatTextOffsetOfRange(mRootContent, mFirstSelectedRange,
&aEvent->mReply.mOffset, lineBreakType);
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsINode> anchorNode, focusNode;
int32_t anchorOffset, focusOffset;
if (mSelection->RangeCount()) {
anchorNode = mSelection->GetAnchorNode();
focusNode = mSelection->GetFocusNode();
if (NS_WARN_IF(!anchorNode) || NS_WARN_IF(!focusNode)) {
return NS_ERROR_FAILURE;
}
anchorOffset = static_cast<int32_t>(mSelection->AnchorOffset());
focusOffset = static_cast<int32_t>(mSelection->FocusOffset());
if (NS_WARN_IF(anchorOffset < 0) || NS_WARN_IF(focusOffset < 0)) {
return NS_ERROR_FAILURE;
}
int16_t compare = nsContentUtils::ComparePoints(anchorNode, anchorOffset,
focusNode, focusOffset);
aEvent->mReply.mReversed = compare > 0;
if (compare) {
RefPtr<nsRange> range;
if (mSelection->RangeCount() == 1) {
range = mFirstSelectedRange;
} else {
rv = nsRange::CreateRange(anchorNode, anchorOffset,
focusNode, focusOffset,
getter_AddRefs(range));
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
if (NS_WARN_IF(!range)) {
return NS_ERROR_FAILURE;
}
}
rv = GenerateFlatTextContent(range, aEvent->mReply.mString,
lineBreakType);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
} else {
aEvent->mReply.mString.Truncate();
}
} else {
NS_ASSERTION(mFirstSelectedRange->Collapsed(),
"When mSelection doesn't have selection, mFirstSelectedRange must be "
"collapsed");
anchorNode = focusNode = mFirstSelectedRange->GetStartParent();
if (NS_WARN_IF(!anchorNode)) {
return NS_ERROR_FAILURE;
}
anchorOffset = focusOffset =
static_cast<int32_t>(mFirstSelectedRange->StartOffset());
if (NS_WARN_IF(anchorOffset < 0)) {
return NS_ERROR_FAILURE;
}
aEvent->mReply.mReversed = false;
aEvent->mReply.mString.Truncate();
}
nsIFrame* frame = nullptr;
rv = GetFrameForTextRect(focusNode, focusOffset, true, &frame);
if (NS_SUCCEEDED(rv) && frame) {
aEvent->mReply.mWritingMode = frame->GetWritingMode();
} else {
aEvent->mReply.mWritingMode = WritingMode();
}
aEvent->mSucceeded = true;
return NS_OK;
}
nsresult
ContentEventHandler::OnQueryTextContent(WidgetQueryContentEvent* aEvent)
{
nsresult rv = Init(aEvent);
if (NS_FAILED(rv)) {
return rv;
}
NS_ASSERTION(aEvent->mReply.mString.IsEmpty(),
"The reply string must be empty");
LineBreakType lineBreakType = GetLineBreakType(aEvent);
RefPtr<nsRange> range = new nsRange(mRootContent);
rv = SetRangeFromFlatTextOffset(range, aEvent->mInput.mOffset,
aEvent->mInput.mLength, lineBreakType, false,
&aEvent->mReply.mOffset);
NS_ENSURE_SUCCESS(rv, rv);
rv = GenerateFlatTextContent(range, aEvent->mReply.mString, lineBreakType);
NS_ENSURE_SUCCESS(rv, rv);
if (aEvent->mWithFontRanges) {
uint32_t fontRangeLength;
rv = GenerateFlatFontRanges(range, aEvent->mReply.mFontRanges,
fontRangeLength, lineBreakType);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
MOZ_ASSERT(fontRangeLength == aEvent->mReply.mString.Length(),
"Font ranges doesn't match the string");
}
aEvent->mSucceeded = true;
return NS_OK;
}
// Adjust to use a child node if possible
// to make the returned rect more accurate
static nsINode* AdjustTextRectNode(nsINode* aNode,
int32_t& aNodeOffset)
{
int32_t childCount = int32_t(aNode->GetChildCount());
nsINode* node = aNode;
if (childCount) {
if (aNodeOffset < childCount) {
node = aNode->GetChildAt(aNodeOffset);
aNodeOffset = 0;
} else if (aNodeOffset == childCount) {
node = aNode->GetChildAt(childCount - 1);
aNodeOffset = node->IsNodeOfType(nsINode::eTEXT) ?
static_cast<int32_t>(static_cast<nsIContent*>(node)->TextLength()) : 1;
}
}
return node;
}
nsresult
ContentEventHandler::OnQueryTextRect(WidgetQueryContentEvent* aEvent)
{
nsresult rv = Init(aEvent);
if (NS_FAILED(rv)) {
return rv;
}
LineBreakType lineBreakType = GetLineBreakType(aEvent);
RefPtr<nsRange> range = new nsRange(mRootContent);
rv = SetRangeFromFlatTextOffset(range, aEvent->mInput.mOffset,
aEvent->mInput.mLength, lineBreakType, true,
&aEvent->mReply.mOffset);
NS_ENSURE_SUCCESS(rv, rv);