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gecko-dev/dom/events/ContentEventHandler.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 sw=2 et 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 "nsCaret.h"
#include "nsCOMPtr.h"
#include "nsContentUtils.h"
#include "nsCopySupport.h"
#include "nsFocusManager.h"
#include "nsFrameSelection.h"
#include "nsIContentIterator.h"
#include "nsIPresShell.h"
#include "nsISelection.h"
#include "nsISelectionController.h"
#include "nsISelectionPrivate.h"
#include "nsIDOMRange.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);
nsCopySupport::GetSelectionForCopy(mPresShell->GetDocument(),
getter_AddRefs(mSelection));
nsCOMPtr<nsIDOMRange> firstRange;
rv = mSelection->GetRangeAt(0, getter_AddRefs(firstRange));
// This shell doesn't support selection.
if (NS_FAILED(rv)) {
return NS_ERROR_NOT_AVAILABLE;
}
mFirstSelectedRange = static_cast<nsRange*>(firstRange.get());
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();
bool isCollapsed;
rv = mSelection->GetIsCollapsed(&isCollapsed);
NS_ENSURE_SUCCESS(rv, NS_ERROR_NOT_AVAILABLE);
aEvent->mReply.mHasSelection = !isCollapsed;
nsRefPtr<nsCaret> caret = mPresShell->GetCaret();
NS_ASSERTION(caret, "GetCaret returned null");
nsRect r;
nsIFrame* frame = caret->GetGeometry(mSelection, &r);
NS_ENSURE_TRUE(frame, 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 = ConvertToRootViewRelativeOffset(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 = ConvertToRootViewRelativeOffset(frame, frameRect);
NS_ENSURE_SUCCESS(rv, rv);
resultRect.UnionRect(resultRect, frameRect);
}
aEvent->mReply.mRect =
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->IsHTML() &&
aContent->Tag() == 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_MACOSX)
// XXX Mac OS X doesn't use "\r".
aString.ReplaceSubstring(NS_LITERAL_STRING("\n"), NS_LITERAL_STRING("\r"));
#elif 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.
NS_ABORT_IF_FALSE(
(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.
NS_ABORT_IF_FALSE(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 aMaxLength)
{
return GetTextLength(aContent, LINE_BREAK_TYPE_NATIVE, aMaxLength);
}
/* static */ uint32_t
ContentEventHandler::GetTextLength(nsIContent* aContent,
LineBreakType aLineBreakType,
uint32_t aMaxLength)
{
if (aContent->IsNodeOfType(nsINode::eTEXT)) {
uint32_t textLengthDifference =
#if defined(XP_MACOSX)
// On Mac, the length of a native newline ("\r") is equal to the length of
// the XP newline ("\n"), so the native length is the same as the XP
// length.
0;
#elif 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)) {
#if defined(XP_WIN)
// Length of \r\n
return (aLineBreakType == LINE_BREAK_TYPE_NATIVE) ? 2 : 1;
#else
return 1;
#endif
}
return 0;
}
static uint32_t ConvertToXPOffset(nsIContent* aContent, uint32_t aNativeOffset)
{
#if defined(XP_MACOSX)
// On Mac, the length of a native newline ("\r") is equal to the length of
// the XP newline ("\n"), so the native offset is the same as the XP offset.
return aNativeOffset;
#elif 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;
}
nsAutoString tmpStr;
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;
}
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.");
nsRefPtr<nsFrameSelection> fs = mPresShell->FrameSelection();
int32_t offsetInFrame;
nsFrameSelection::HINT hint =
aForward ? nsFrameSelection::HINTLEFT : nsFrameSelection::HINTRIGHT;
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) {
nsCOMPtr<nsIDOMNode> domNode(do_QueryInterface(content));
NS_ASSERTION(domNode, "aContent doesn't have nsIDOMNode!");
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(domNode, 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(domNode, int32_t(xpOffset));
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
}
if (endOffset <= offset + textLength) {
nsCOMPtr<nsIDOMNode> domNode(do_QueryInterface(content));
NS_ASSERTION(domNode, "aContent doesn't have nsIDOMNode!");
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;
}
domNode = do_QueryInterface(iter->GetCurrentNode());
}
rv = aRange->SetEnd(domNode, int32_t(xpOffset));
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
offset += textLength;
}
if (offset < aOffset) {
return NS_ERROR_FAILURE;
}
nsCOMPtr<nsIDOMNode> domNode(do_QueryInterface(mRootContent));
NS_ASSERTION(domNode, "lastContent doesn't have nsIDOMNode!");
if (!startSet) {
MOZ_ASSERT(!mRootContent->IsNodeOfType(nsINode::eTEXT));
rv = aRange->SetStart(domNode, int32_t(mRootContent->GetChildCount()));
NS_ENSURE_SUCCESS(rv, rv);
if (aNewOffset) {
*aNewOffset = offset;
}
}
rv = aRange->SetEnd(domNode, int32_t(mRootContent->GetChildCount()));
NS_ASSERTION(NS_SUCCEEDED(rv), "nsIDOMRange::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::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<nsIDOMNode> anchorDomNode, focusDomNode;
rv = mSelection->GetAnchorNode(getter_AddRefs(anchorDomNode));
NS_ENSURE_TRUE(anchorDomNode, NS_ERROR_FAILURE);
rv = mSelection->GetFocusNode(getter_AddRefs(focusDomNode));
NS_ENSURE_TRUE(focusDomNode, NS_ERROR_FAILURE);
int32_t anchorOffset, focusOffset;
rv = mSelection->GetAnchorOffset(&anchorOffset);
NS_ENSURE_SUCCESS(rv, rv);
rv = mSelection->GetFocusOffset(&focusOffset);
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsINode> anchorNode(do_QueryInterface(anchorDomNode));
nsCOMPtr<nsINode> focusNode(do_QueryInterface(focusDomNode));
NS_ENSURE_TRUE(anchorNode && focusNode, NS_ERROR_UNEXPECTED);
int16_t compare = nsContentUtils::ComparePoints(anchorNode, anchorOffset,
focusNode, focusOffset);
aEvent->mReply.mReversed = compare > 0;
if (compare) {
rv = GenerateFlatTextContent(mFirstSelectedRange, aEvent->mReply.mString,
lineBreakType);
NS_ENSURE_SUCCESS(rv, rv);
}
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);
nsRefPtr<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);
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;
}
// 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::OnQueryTextRect(WidgetQueryContentEvent* aEvent)
{
nsresult rv = Init(aEvent);
if (NS_FAILED(rv)) {
return rv;
}
LineBreakType lineBreakType = GetLineBreakType(aEvent);
nsRefPtr<nsRange> range = new nsRange(mRootContent);
rv = SetRangeFromFlatTextOffset(range, aEvent->mInput.mOffset,
aEvent->mInput.mLength, lineBreakType, true,
&aEvent->mReply.mOffset);
NS_ENSURE_SUCCESS(rv, rv);
rv = GenerateFlatTextContent(range, aEvent->mReply.mString, lineBreakType);
NS_ENSURE_SUCCESS(rv, rv);
// used to iterate over all contents and their frames
nsCOMPtr<nsIContentIterator> iter = NS_NewContentIterator();
iter->Init(range);
// get the starting frame
int32_t nodeOffset = range->StartOffset();
nsINode* node = iter->GetCurrentNode();
if (!node) {
node = AdjustTextRectNode(range->GetStartParent(), nodeOffset);
}
nsIFrame* firstFrame = nullptr;
rv = GetFrameForTextRect(node, nodeOffset, true, &firstFrame);
NS_ENSURE_SUCCESS(rv, rv);
// get the starting frame rect
nsRect rect(nsPoint(0, 0), firstFrame->GetRect().Size());
rv = ConvertToRootViewRelativeOffset(firstFrame, rect);
NS_ENSURE_SUCCESS(rv, rv);
nsRect frameRect = rect;
nsPoint ptOffset;
firstFrame->GetPointFromOffset(nodeOffset, &ptOffset);
// minus 1 to avoid creating an empty rect
rect.x += ptOffset.x - 1;
rect.width -= ptOffset.x - 1;
// get the ending frame
nodeOffset = range->EndOffset();
node = AdjustTextRectNode(range->GetEndParent(), nodeOffset);
nsIFrame* lastFrame = nullptr;
rv = GetFrameForTextRect(node, nodeOffset, range->Collapsed(), &lastFrame);
NS_ENSURE_SUCCESS(rv, rv);
// iterate over all covered frames
for (nsIFrame* frame = firstFrame; frame != lastFrame;) {
frame = frame->GetNextContinuation();
if (!frame) {
do {
iter->Next();
node = iter->GetCurrentNode();
if (!node) {
break;
}
if (!node->IsNodeOfType(nsINode::eCONTENT)) {
continue;
}
frame = static_cast<nsIContent*>(node)->GetPrimaryFrame();
} while (!frame && !iter->IsDone());
if (!frame) {
// this can happen when the end offset of the range is 0.
frame = lastFrame;
}
}
frameRect.SetRect(nsPoint(0, 0), frame->GetRect().Size());
rv = ConvertToRootViewRelativeOffset(frame, frameRect);
NS_ENSURE_SUCCESS(rv, rv);
if (frame != lastFrame) {
// not last frame, so just add rect to previous result
rect.UnionRect(rect, frameRect);
}
}
// get the ending frame rect
lastFrame->GetPointFromOffset(nodeOffset, &ptOffset);
// minus 1 to avoid creating an empty rect
frameRect.width -= lastFrame->GetRect().width - ptOffset.x - 1;
if (firstFrame == lastFrame) {
rect.IntersectRect(rect, frameRect);
} else {
rect.UnionRect(rect, frameRect);
}
aEvent->mReply.mRect =
rect.ToOutsidePixels(mPresContext->AppUnitsPerDevPixel());
aEvent->mSucceeded = true;
return NS_OK;
}
nsresult
ContentEventHandler::OnQueryEditorRect(WidgetQueryContentEvent* aEvent)
{
nsresult rv = Init(aEvent);
if (NS_FAILED(rv)) {
return rv;
}
nsIContent* focusedContent = GetFocusedContent();
rv = QueryContentRect(IsPlugin(focusedContent) ?
focusedContent : mRootContent.get(), aEvent);
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
nsresult
ContentEventHandler::OnQueryCaretRect(WidgetQueryContentEvent* aEvent)
{
nsresult rv = Init(aEvent);
if (NS_FAILED(rv)) {
return rv;
}
LineBreakType lineBreakType = GetLineBreakType(aEvent);
nsRefPtr<nsCaret> caret = mPresShell->GetCaret();
NS_ASSERTION(caret, "GetCaret returned null");
// When the selection is collapsed and the queried offset is current caret
// position, we should return the "real" caret rect.
bool selectionIsCollapsed;
rv = mSelection->GetIsCollapsed(&selectionIsCollapsed);
NS_ENSURE_SUCCESS(rv, rv);
if (selectionIsCollapsed) {
uint32_t offset;
rv = GetFlatTextOffsetOfRange(mRootContent, mFirstSelectedRange, &offset,
lineBreakType);
NS_ENSURE_SUCCESS(rv, rv);
if (offset == aEvent->mInput.mOffset) {
nsRect rect;
nsIFrame* caretFrame = caret->GetGeometry(mSelection, &rect);
if (!caretFrame) {
return NS_ERROR_FAILURE;
}
rv = ConvertToRootViewRelativeOffset(caretFrame, rect);
NS_ENSURE_SUCCESS(rv, rv);
aEvent->mReply.mRect =
rect.ToOutsidePixels(caretFrame->PresContext()->AppUnitsPerDevPixel());
aEvent->mReply.mOffset = aEvent->mInput.mOffset;
aEvent->mSucceeded = true;
return NS_OK;
}
}
// Otherwise, we should set the guessed caret rect.
nsRefPtr<nsRange> range = new nsRange(mRootContent);
rv = SetRangeFromFlatTextOffset(range, aEvent->mInput.mOffset, 0,
lineBreakType, true,
&aEvent->mReply.mOffset);
NS_ENSURE_SUCCESS(rv, rv);
int32_t xpOffsetInFrame;
nsIFrame* frame;
rv = GetStartFrameAndOffset(range, &frame, &xpOffsetInFrame);
NS_ENSURE_SUCCESS(rv, rv);
nsPoint posInFrame;
rv = frame->GetPointFromOffset(range->StartOffset(), &posInFrame);
NS_ENSURE_SUCCESS(rv, rv);
nsRect rect;
rect.x = posInFrame.x;
rect.y = posInFrame.y;
rect.width = caret->GetCaretRect().width;
rect.height = frame->GetSize().height;
rv = ConvertToRootViewRelativeOffset(frame, rect);
NS_ENSURE_SUCCESS(rv, rv);
aEvent->mReply.mRect =
rect.ToOutsidePixels(mPresContext->AppUnitsPerDevPixel());
aEvent->mSucceeded = true;
return NS_OK;
}
nsresult
ContentEventHandler::OnQueryContentState(WidgetQueryContentEvent* aEvent)
{
nsresult rv = Init(aEvent);
if (NS_FAILED(rv)) {
return rv;
}
aEvent->mSucceeded = true;
return NS_OK;
}
nsresult
ContentEventHandler::OnQuerySelectionAsTransferable(
WidgetQueryContentEvent* aEvent)
{
nsresult rv = Init(aEvent);
if (NS_FAILED(rv)) {
return rv;
}
if (!aEvent->mReply.mHasSelection) {
aEvent->mSucceeded = true;
aEvent->mReply.mTransferable = nullptr;
return NS_OK;
}
nsCOMPtr<nsIDocument> doc = mPresShell->GetDocument();
NS_ENSURE_TRUE(doc, NS_ERROR_FAILURE);
rv = nsCopySupport::GetTransferableForSelection(
mSelection, doc, getter_AddRefs(aEvent->mReply.mTransferable));
NS_ENSURE_SUCCESS(rv, rv);
aEvent->mSucceeded = true;
return NS_OK;
}
nsresult
ContentEventHandler::OnQueryCharacterAtPoint(WidgetQueryContentEvent* aEvent)
{
nsresult rv = Init(aEvent);
if (NS_FAILED(rv)) {
return rv;
}
nsIFrame* rootFrame = mPresShell->GetRootFrame();
NS_ENSURE_TRUE(rootFrame, NS_ERROR_FAILURE);
nsIWidget* rootWidget = rootFrame->GetNearestWidget();
NS_ENSURE_TRUE(rootWidget, NS_ERROR_FAILURE);
// The root frame's widget might be different, e.g., the event was fired on
// a popup but the rootFrame is the document root.
if (rootWidget != aEvent->widget) {
NS_PRECONDITION(aEvent->widget, "The event must have the widget");
nsView* view = nsView::GetViewFor(aEvent->widget);
NS_ENSURE_TRUE(view, NS_ERROR_FAILURE);
rootFrame = view->GetFrame();
NS_ENSURE_TRUE(rootFrame, NS_ERROR_FAILURE);
rootWidget = rootFrame->GetNearestWidget();
NS_ENSURE_TRUE(rootWidget, NS_ERROR_FAILURE);
}
WidgetQueryContentEvent eventOnRoot(true, NS_QUERY_CHARACTER_AT_POINT,
rootWidget);
eventOnRoot.mUseNativeLineBreak = aEvent->mUseNativeLineBreak;
eventOnRoot.refPoint = aEvent->refPoint;
if (rootWidget != aEvent->widget) {
eventOnRoot.refPoint += LayoutDeviceIntPoint::FromUntyped(
aEvent->widget->WidgetToScreenOffset() -
rootWidget->WidgetToScreenOffset());
}
nsPoint ptInRoot =
nsLayoutUtils::GetEventCoordinatesRelativeTo(&eventOnRoot, rootFrame);
nsIFrame* targetFrame = nsLayoutUtils::GetFrameForPoint(rootFrame, ptInRoot);
if (!targetFrame || targetFrame->GetType() != nsGkAtoms::textFrame ||
!targetFrame->GetContent() ||
!nsContentUtils::ContentIsDescendantOf(targetFrame->GetContent(),
mRootContent)) {
// there is no character at the point.
aEvent->mReply.mOffset = WidgetQueryContentEvent::NOT_FOUND;
aEvent->mSucceeded = true;
return NS_OK;
}
nsPoint ptInTarget = ptInRoot + rootFrame->GetOffsetToCrossDoc(targetFrame);
int32_t rootAPD = rootFrame->PresContext()->AppUnitsPerDevPixel();
int32_t targetAPD = targetFrame->PresContext()->AppUnitsPerDevPixel();
ptInTarget = ptInTarget.ConvertAppUnits(rootAPD, targetAPD);
nsTextFrame* textframe = static_cast<nsTextFrame*>(targetFrame);
nsIFrame::ContentOffsets contentOffsets =
textframe->GetCharacterOffsetAtFramePoint(ptInTarget);
NS_ENSURE_TRUE(contentOffsets.content, NS_ERROR_FAILURE);
uint32_t offset;
rv = GetFlatTextOffsetOfRange(mRootContent, contentOffsets.content,
contentOffsets.offset, &offset,
GetLineBreakType(aEvent));
NS_ENSURE_SUCCESS(rv, rv);
WidgetQueryContentEvent textRect(true, NS_QUERY_TEXT_RECT, aEvent->widget);
textRect.InitForQueryTextRect(offset, 1, aEvent->mUseNativeLineBreak);
rv = OnQueryTextRect(&textRect);
NS_ENSURE_SUCCESS(rv, rv);
NS_ENSURE_TRUE(textRect.mSucceeded, NS_ERROR_FAILURE);
// currently, we don't need to get the actual text.
aEvent->mReply.mOffset = offset;
aEvent->mReply.mRect = textRect.mReply.mRect;
aEvent->mSucceeded = true;
return NS_OK;
}
nsresult
ContentEventHandler::OnQueryDOMWidgetHittest(WidgetQueryContentEvent* aEvent)
{
NS_ASSERTION(aEvent, "aEvent must not be null");
nsresult rv = InitBasic();
if (NS_FAILED(rv)) {
return rv;
}
aEvent->mSucceeded = false;
aEvent->mReply.mWidgetIsHit = false;
NS_ENSURE_TRUE(aEvent->widget, NS_ERROR_FAILURE);
nsIDocument* doc = mPresShell->GetDocument();
NS_ENSURE_TRUE(doc, NS_ERROR_FAILURE);
nsIFrame* docFrame = mPresShell->GetRootFrame();
NS_ENSURE_TRUE(docFrame, NS_ERROR_FAILURE);
LayoutDeviceIntPoint eventLoc = aEvent->refPoint +
LayoutDeviceIntPoint::FromUntyped(aEvent->widget->WidgetToScreenOffset());
nsIntRect docFrameRect = docFrame->GetScreenRect(); // Returns CSS pixels
CSSIntPoint eventLocCSS(
mPresContext->DevPixelsToIntCSSPixels(eventLoc.x) - docFrameRect.x,
mPresContext->DevPixelsToIntCSSPixels(eventLoc.y) - docFrameRect.y);
Element* contentUnderMouse =
doc->ElementFromPointHelper(eventLocCSS.x, eventLocCSS.y, false, false);
if (contentUnderMouse) {
nsIWidget* targetWidget = nullptr;
nsIFrame* targetFrame = contentUnderMouse->GetPrimaryFrame();
nsIObjectFrame* pluginFrame = do_QueryFrame(targetFrame);
if (pluginFrame) {
targetWidget = pluginFrame->GetWidget();
} else if (targetFrame) {
targetWidget = targetFrame->GetNearestWidget();
}
if (aEvent->widget == targetWidget) {
aEvent->mReply.mWidgetIsHit = true;
}
}
aEvent->mSucceeded = true;
return NS_OK;
}
/* static */ nsresult
ContentEventHandler::GetFlatTextOffsetOfRange(nsIContent* aRootContent,
nsINode* aNode,
int32_t aNodeOffset,
uint32_t* aOffset,
LineBreakType aLineBreakType)
{
NS_ENSURE_STATE(aRootContent);
NS_ASSERTION(aOffset, "param is invalid");
nsRefPtr<nsRange> prev = new nsRange(aRootContent);
nsCOMPtr<nsIDOMNode> rootDOMNode(do_QueryInterface(aRootContent));
prev->SetStart(rootDOMNode, 0);
nsCOMPtr<nsIDOMNode> startDOMNode(do_QueryInterface(aNode));
NS_ASSERTION(startDOMNode, "startNode doesn't have nsIDOMNode");
nsCOMPtr<nsIContentIterator> iter = NS_NewContentIterator();
if (aNode->Length() >= static_cast<uint32_t>(aNodeOffset)) {
// Offset is within node's length; set end of range to that offset
prev->SetEnd(startDOMNode, aNodeOffset);
iter->Init(prev);
} else if (aNode != static_cast<nsINode*>(aRootContent)) {
// Offset is past node's length; set end of range to end of node
prev->SetEndAfter(startDOMNode);
iter->Init(prev);
} else {
// Offset is past the root node; set end of range to end of root node
iter->Init(aRootContent);
}
nsCOMPtr<nsINode> startNode = do_QueryInterface(startDOMNode);
nsINode* endNode = aNode;
*aOffset = 0;
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 (node->IsNodeOfType(nsINode::eTEXT)) {
// Note: our range always starts from offset 0
if (node == endNode) {
*aOffset += GetTextLength(content, aLineBreakType, aNodeOffset);
} else {
*aOffset += GetTextLength(content, aLineBreakType);
}
} else if (IsContentBR(content)) {
#if defined(XP_WIN)
// On Windows, the length of the newline is 2.
*aOffset += (aLineBreakType == LINE_BREAK_TYPE_NATIVE) ? 2 : 1;
#else
// On other platforms, the length of the newline is 1.
*aOffset += 1;
#endif
}
}
return NS_OK;
}
/* static */ nsresult
ContentEventHandler::GetFlatTextOffsetOfRange(nsIContent* aRootContent,
nsRange* aRange,
uint32_t* aOffset,
LineBreakType aLineBreakType)
{
nsINode* startNode = aRange->GetStartParent();
NS_ENSURE_TRUE(startNode, NS_ERROR_FAILURE);
int32_t startOffset = aRange->StartOffset();
return GetFlatTextOffsetOfRange(aRootContent, startNode, startOffset,
aOffset, aLineBreakType);
}
nsresult
ContentEventHandler::GetStartFrameAndOffset(nsRange* aRange,
nsIFrame** aFrame,
int32_t* aOffsetInFrame)
{
NS_ASSERTION(aRange && aFrame && aOffsetInFrame, "params are invalid");
nsIContent* content = nullptr;
nsINode* node = aRange->GetStartParent();
if (node && node->IsNodeOfType(nsINode::eCONTENT)) {
content = static_cast<nsIContent*>(node);
}
NS_ASSERTION(content, "the start node doesn't have nsIContent!");
nsRefPtr<nsFrameSelection> fs = mPresShell->FrameSelection();
*aFrame = fs->GetFrameForNodeOffset(content, aRange->StartOffset(),
fs->GetHint(), aOffsetInFrame);
NS_ENSURE_TRUE((*aFrame), NS_ERROR_FAILURE);
NS_ASSERTION((*aFrame)->GetType() == nsGkAtoms::textFrame,
"The frame is not textframe");
return NS_OK;
}
nsresult
ContentEventHandler::ConvertToRootViewRelativeOffset(nsIFrame* aFrame,
nsRect& aRect)
{
NS_ASSERTION(aFrame, "aFrame must not be null");
nsView* view = nullptr;
nsPoint posInView;
aFrame->GetOffsetFromView(posInView, &view);
if (!view) {
return NS_ERROR_FAILURE;
}
aRect += posInView + view->GetOffsetTo(nullptr);
return NS_OK;
}
static void AdjustRangeForSelection(nsIContent* aRoot,
nsINode** aNode,
int32_t* aNodeOffset)
{
nsINode* node = *aNode;
int32_t nodeOffset = *aNodeOffset;
if (aRoot != node && node->GetParent()) {
if (node->IsNodeOfType(nsINode::eTEXT)) {
// When the offset is at the end of the text node, set it to after the
// text node, to make sure the caret is drawn on a new line when the last
// character of the text node is '\n'
int32_t nodeLength =
static_cast<int32_t>(static_cast<nsIContent*>(node)->TextLength());
MOZ_ASSERT(nodeOffset <= nodeLength, "Offset is past length of text node");
if (nodeOffset == nodeLength) {
node = node->GetParent();
nodeOffset = node->IndexOf(*aNode) + 1;
}
} else {
node = node->GetParent();
nodeOffset = node->IndexOf(*aNode) + (nodeOffset ? 1 : 0);
}
}
nsIContent* brContent = node->GetChildAt(nodeOffset - 1);
while (brContent && brContent->IsHTML()) {
if (brContent->Tag() != nsGkAtoms::br || IsContentBR(brContent)) {
break;
}
brContent = node->GetChildAt(--nodeOffset - 1);
}
*aNode = node;
*aNodeOffset = std::max(nodeOffset, 0);
}
nsresult
ContentEventHandler::OnSelectionEvent(WidgetSelectionEvent* aEvent)
{
aEvent->mSucceeded = false;
// Get selection to manipulate
// XXX why do we need to get them from ISM? This method should work fine
// without ISM.
nsresult rv =
IMEStateManager::GetFocusSelectionAndRoot(getter_AddRefs(mSelection),
getter_AddRefs(mRootContent));
if (rv != NS_ERROR_NOT_AVAILABLE) {
NS_ENSURE_SUCCESS(rv, rv);
} else {
rv = Init(aEvent);
NS_ENSURE_SUCCESS(rv, rv);
}
// Get range from offset and length
nsRefPtr<nsRange> range = new nsRange(mRootContent);
rv = SetRangeFromFlatTextOffset(range, aEvent->mOffset, aEvent->mLength,
GetLineBreakType(aEvent),
aEvent->mExpandToClusterBoundary);
NS_ENSURE_SUCCESS(rv, rv);
nsINode* startNode = range->GetStartParent();
nsINode* endNode = range->GetEndParent();
int32_t startNodeOffset = range->StartOffset();
int32_t endNodeOffset = range->EndOffset();
AdjustRangeForSelection(mRootContent, &startNode, &startNodeOffset);
AdjustRangeForSelection(mRootContent, &endNode, &endNodeOffset);
nsCOMPtr<nsIDOMNode> startDomNode(do_QueryInterface(startNode));
nsCOMPtr<nsIDOMNode> endDomNode(do_QueryInterface(endNode));
NS_ENSURE_TRUE(startDomNode && endDomNode, NS_ERROR_UNEXPECTED);
nsCOMPtr<nsISelectionPrivate> selPrivate(do_QueryInterface(mSelection));
selPrivate->StartBatchChanges();
// Clear selection first before setting
rv = mSelection->RemoveAllRanges();
// Need to call EndBatchChanges at the end even if call failed
if (NS_SUCCEEDED(rv)) {
if (aEvent->mReversed) {
rv = mSelection->Collapse(endDomNode, endNodeOffset);
} else {
rv = mSelection->Collapse(startDomNode, startNodeOffset);
}
if (NS_SUCCEEDED(rv) &&
(startDomNode != endDomNode || startNodeOffset != endNodeOffset)) {
if (aEvent->mReversed) {
rv = mSelection->Extend(startDomNode, startNodeOffset);
} else {
rv = mSelection->Extend(endDomNode, endNodeOffset);
}
}
}
selPrivate->EndBatchChanges();
NS_ENSURE_SUCCESS(rv, rv);
selPrivate->ScrollIntoViewInternal(
nsISelectionController::SELECTION_FOCUS_REGION,
false, nsIPresShell::ScrollAxis(), nsIPresShell::ScrollAxis());
aEvent->mSucceeded = true;
return NS_OK;
}
} // namespace mozilla
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