mozilla
/
gecko-dev
зеркало из https://github.com/mozilla/gecko-dev.git
1
0
Форкнуть 0
Код Задачи Пакеты Проекты Релизы Вики Активность
gecko-dev/accessible/generic/HyperTextAccessible.cpp

2037 строки
67 KiB
C++
Исходник Ответственный История

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 sw=2 et tw=78: */
/* 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 "HyperTextAccessible-inl.h"
#include "Accessible-inl.h"
#include "nsAccessibilityService.h"
#include "nsIAccessibleTypes.h"
#include "DocAccessible.h"
#include "HTMLListAccessible.h"
#include "Role.h"
#include "States.h"
#include "TextAttrs.h"
#include "TextRange.h"
#include "TreeWalker.h"
#include "nsCaret.h"
#include "nsContentUtils.h"
#include "nsFocusManager.h"
#include "nsIDOMRange.h"
#include "nsIEditingSession.h"
#include "nsContainerFrame.h"
#include "nsFrameSelection.h"
#include "nsILineIterator.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsIPersistentProperties2.h"
#include "nsIScrollableFrame.h"
#include "nsIServiceManager.h"
#include "nsITextControlElement.h"
#include "nsTextFragment.h"
#include "mozilla/BinarySearch.h"
#include "mozilla/dom/Element.h"
#include "mozilla/EventStates.h"
#include "mozilla/dom/Selection.h"
#include "mozilla/MathAlgorithms.h"
#include "gfxSkipChars.h"
#include <algorithm>
using namespace mozilla;
using namespace mozilla::a11y;
////////////////////////////////////////////////////////////////////////////////
// HyperTextAccessible
////////////////////////////////////////////////////////////////////////////////
HyperTextAccessible::
HyperTextAccessible(nsIContent* aNode, DocAccessible* aDoc) :
AccessibleWrap(aNode, aDoc)
{
mGenericTypes |= eHyperText;
}
NS_IMPL_ISUPPORTS_INHERITED0(HyperTextAccessible, Accessible)
role
HyperTextAccessible::NativeRole()
{
nsIAtom *tag = mContent->Tag();
if (tag == nsGkAtoms::dd)
return roles::DEFINITION;
if (tag == nsGkAtoms::form)
return roles::FORM;
if (tag == nsGkAtoms::blockquote || tag == nsGkAtoms::div ||
tag == nsGkAtoms::section || tag == nsGkAtoms::nav)
return roles::SECTION;
if (tag == nsGkAtoms::h1 || tag == nsGkAtoms::h2 ||
tag == nsGkAtoms::h3 || tag == nsGkAtoms::h4 ||
tag == nsGkAtoms::h5 || tag == nsGkAtoms::h6)
return roles::HEADING;
if (tag == nsGkAtoms::article)
return roles::DOCUMENT;
// Deal with html landmark elements
if (tag == nsGkAtoms::header)
return roles::HEADER;
if (tag == nsGkAtoms::footer)
return roles::FOOTER;
if (tag == nsGkAtoms::aside)
return roles::NOTE;
// Treat block frames as paragraphs
nsIFrame *frame = GetFrame();
if (frame && frame->GetType() == nsGkAtoms::blockFrame)
return roles::PARAGRAPH;
return roles::TEXT_CONTAINER; // In ATK this works
}
uint64_t
HyperTextAccessible::NativeState()
{
uint64_t states = AccessibleWrap::NativeState();
if (mContent->AsElement()->State().HasState(NS_EVENT_STATE_MOZ_READWRITE)) {
states |= states::EDITABLE;
} else if (mContent->Tag() == nsGkAtoms::article) {
// We want <article> to behave like a document in terms of readonly state.
states |= states::READONLY;
}
if (HasChildren())
states |= states::SELECTABLE_TEXT;
return states;
}
nsIntRect
HyperTextAccessible::GetBoundsInFrame(nsIFrame* aFrame,
uint32_t aStartRenderedOffset,
uint32_t aEndRenderedOffset)
{
nsPresContext* presContext = mDoc->PresContext();
if (aFrame->GetType() != nsGkAtoms::textFrame) {
return aFrame->GetScreenRectInAppUnits().
ToNearestPixels(presContext->AppUnitsPerDevPixel());
}
// Substring must be entirely within the same text node.
int32_t startContentOffset, endContentOffset;
nsresult rv = RenderedToContentOffset(aFrame, aStartRenderedOffset, &startContentOffset);
NS_ENSURE_SUCCESS(rv, nsIntRect());
rv = RenderedToContentOffset(aFrame, aEndRenderedOffset, &endContentOffset);
NS_ENSURE_SUCCESS(rv, nsIntRect());
nsIFrame *frame;
int32_t startContentOffsetInFrame;
// Get the right frame continuation -- not really a child, but a sibling of
// the primary frame passed in
rv = aFrame->GetChildFrameContainingOffset(startContentOffset, false,
&startContentOffsetInFrame, &frame);
NS_ENSURE_SUCCESS(rv, nsIntRect());
nsRect screenRect;
while (frame && startContentOffset < endContentOffset) {
// Start with this frame's screen rect, which we will shrink based on
// the substring we care about within it. We will then add that frame to
// the total screenRect we are returning.
nsRect frameScreenRect = frame->GetScreenRectInAppUnits();
// Get the length of the substring in this frame that we want the bounds for
int32_t startFrameTextOffset, endFrameTextOffset;
frame->GetOffsets(startFrameTextOffset, endFrameTextOffset);
int32_t frameTotalTextLength = endFrameTextOffset - startFrameTextOffset;
int32_t seekLength = endContentOffset - startContentOffset;
int32_t frameSubStringLength = std::min(frameTotalTextLength - startContentOffsetInFrame, seekLength);
// Add the point where the string starts to the frameScreenRect
nsPoint frameTextStartPoint;
rv = frame->GetPointFromOffset(startContentOffset, &frameTextStartPoint);
NS_ENSURE_SUCCESS(rv, nsIntRect());
// Use the point for the end offset to calculate the width
nsPoint frameTextEndPoint;
rv = frame->GetPointFromOffset(startContentOffset + frameSubStringLength, &frameTextEndPoint);
NS_ENSURE_SUCCESS(rv, nsIntRect());
frameScreenRect.x += std::min(frameTextStartPoint.x, frameTextEndPoint.x);
frameScreenRect.width = mozilla::Abs(frameTextStartPoint.x - frameTextEndPoint.x);
screenRect.UnionRect(frameScreenRect, screenRect);
// Get ready to loop back for next frame continuation
startContentOffset += frameSubStringLength;
startContentOffsetInFrame = 0;
frame = frame->GetNextContinuation();
}
return screenRect.ToNearestPixels(presContext->AppUnitsPerDevPixel());
}
void
HyperTextAccessible::TextSubstring(int32_t aStartOffset, int32_t aEndOffset,
nsAString& aText)
{
aText.Truncate();
index_t startOffset = ConvertMagicOffset(aStartOffset);
index_t endOffset = ConvertMagicOffset(aEndOffset);
if (!startOffset.IsValid() || !endOffset.IsValid() ||
startOffset > endOffset || endOffset > CharacterCount()) {
NS_ERROR("Wrong in offset");
return;
}
int32_t startChildIdx = GetChildIndexAtOffset(startOffset);
if (startChildIdx == -1)
return;
int32_t endChildIdx = GetChildIndexAtOffset(endOffset);
if (endChildIdx == -1)
return;
if (startChildIdx == endChildIdx) {
int32_t childOffset = GetChildOffset(startChildIdx);
if (childOffset == -1)
return;
Accessible* child = GetChildAt(startChildIdx);
child->AppendTextTo(aText, startOffset - childOffset,
endOffset - startOffset);
return;
}
int32_t startChildOffset = GetChildOffset(startChildIdx);
if (startChildOffset == -1)
return;
Accessible* startChild = GetChildAt(startChildIdx);
startChild->AppendTextTo(aText, startOffset - startChildOffset);
for (int32_t childIdx = startChildIdx + 1; childIdx < endChildIdx; childIdx++) {
Accessible* child = GetChildAt(childIdx);
child->AppendTextTo(aText);
}
int32_t endChildOffset = GetChildOffset(endChildIdx);
if (endChildOffset == -1)
return;
Accessible* endChild = GetChildAt(endChildIdx);
endChild->AppendTextTo(aText, 0, endOffset - endChildOffset);
}
uint32_t
HyperTextAccessible::DOMPointToOffset(nsINode* aNode, int32_t aNodeOffset,
bool aIsEndOffset) const
{
if (!aNode)
return 0;
uint32_t offset = 0;
nsINode* findNode = nullptr;
if (aNodeOffset == -1) {
findNode = aNode;
} else if (aNode->IsNodeOfType(nsINode::eTEXT)) {
// For text nodes, aNodeOffset comes in as a character offset
// Text offset will be added at the end, if we find the offset in this hypertext
// We want the "skipped" offset into the text (rendered text without the extra whitespace)
nsIFrame* frame = aNode->AsContent()->GetPrimaryFrame();
NS_ENSURE_TRUE(frame, 0);
nsresult rv = ContentToRenderedOffset(frame, aNodeOffset, &offset);
NS_ENSURE_SUCCESS(rv, 0);
findNode = aNode;
} else {
// findNode could be null if aNodeOffset == # of child nodes, which means
// one of two things:
// 1) there are no children, and the passed-in node is not mContent -- use
// parentContent for the node to find
// 2) there are no children and the passed-in node is mContent, which means
// we're an empty nsIAccessibleText
// 3) there are children and we're at the end of the children
findNode = aNode->GetChildAt(aNodeOffset);
if (!findNode) {
if (aNodeOffset == 0) {
if (aNode == GetNode()) {
// Case #1: this accessible has no children and thus has empty text,
// we can only be at hypertext offset 0.
return 0;
}
// Case #2: there are no children, we're at this node.
findNode = aNode;
} else if (aNodeOffset == static_cast<int32_t>(aNode->GetChildCount())) {
// Case #3: we're after the last child, get next node to this one.
for (nsINode* tmpNode = aNode;
!findNode && tmpNode && tmpNode != mContent;
tmpNode = tmpNode->GetParent()) {
findNode = tmpNode->GetNextSibling();
}
}
}
}
// Get accessible for this findNode, or if that node isn't accessible, use the
// accessible for the next DOM node which has one (based on forward depth first search)
Accessible* descendant = nullptr;
if (findNode) {
nsCOMPtr<nsIContent> findContent(do_QueryInterface(findNode));
if (findContent && findContent->IsHTML() &&
findContent->NodeInfo()->Equals(nsGkAtoms::br) &&
findContent->AttrValueIs(kNameSpaceID_None,
nsGkAtoms::mozeditorbogusnode,
nsGkAtoms::_true,
eIgnoreCase)) {
// This <br> is the hacky "bogus node" used when there is no text in a control
return 0;
}
descendant = mDoc->GetAccessible(findNode);
if (!descendant && findNode->IsContent()) {
Accessible* container = mDoc->GetContainerAccessible(findNode);
if (container) {
TreeWalker walker(container, findNode->AsContent(),
TreeWalker::eWalkContextTree);
descendant = walker.NextChild();
if (!descendant)
descendant = container;
}
}
}
return TransformOffset(descendant, offset, aIsEndOffset);
}
uint32_t
HyperTextAccessible::TransformOffset(Accessible* aDescendant,
uint32_t aOffset, bool aIsEndOffset) const
{
// From the descendant, go up and get the immediate child of this hypertext.
uint32_t offset = aOffset;
Accessible* descendant = aDescendant;
while (descendant) {
Accessible* parent = descendant->Parent();
if (parent == this)
return GetChildOffset(descendant) + offset;
// This offset no longer applies because the passed-in text object is not
// a child of the hypertext. This happens when there are nested hypertexts,
// e.g. <div>abc<h1>def</h1>ghi</div>. Thus we need to adjust the offset
// to make it relative the hypertext.
// If the end offset is not supposed to be inclusive and the original point
// is not at 0 offset then the returned offset should be after an embedded
// character the original point belongs to.
if (aIsEndOffset)
offset = (offset > 0 || descendant->IndexInParent() > 0) ? 1 : 0;
else
offset = 0;
descendant = parent;
}
// If the given a11y point cannot be mapped into offset relative this hypertext
// offset then return length as fallback value.
return CharacterCount();
}
bool
HyperTextAccessible::OffsetsToDOMRange(int32_t aStartOffset, int32_t aEndOffset,
nsRange* aRange)
{
DOMPoint startPoint = OffsetToDOMPoint(aStartOffset);
if (!startPoint.node)
return false;
aRange->SetStart(startPoint.node, startPoint.idx);
if (aStartOffset == aEndOffset) {
aRange->SetEnd(startPoint.node, startPoint.idx);
return true;
}
DOMPoint endPoint = OffsetToDOMPoint(aEndOffset);
if (!endPoint.node)
return false;
aRange->SetEnd(endPoint.node, endPoint.idx);
return true;
}
DOMPoint
HyperTextAccessible::OffsetToDOMPoint(int32_t aOffset)
{
// 0 offset is valid even if no children. In this case the associated editor
// is empty so return a DOM point for editor root element.
if (aOffset == 0) {
nsCOMPtr<nsIEditor> editor = GetEditor();
if (editor) {
bool isEmpty = false;
editor->GetDocumentIsEmpty(&isEmpty);
if (isEmpty) {
nsCOMPtr<nsIDOMElement> editorRootElm;
editor->GetRootElement(getter_AddRefs(editorRootElm));
nsCOMPtr<nsINode> editorRoot(do_QueryInterface(editorRootElm));
return DOMPoint(editorRoot, 0);
}
}
}
int32_t childIdx = GetChildIndexAtOffset(aOffset);
if (childIdx == -1)
return DOMPoint();
Accessible* child = GetChildAt(childIdx);
int32_t innerOffset = aOffset - GetChildOffset(childIdx);
// A text leaf case. The point is inside the text node.
if (child->IsTextLeaf()) {
nsIContent* content = child->GetContent();
int32_t idx = 0;
if (NS_FAILED(RenderedToContentOffset(content->GetPrimaryFrame(),
innerOffset, &idx)))
return DOMPoint();
return DOMPoint(content, idx);
}
// Case of embedded object. The point is either before or after the element.
NS_ASSERTION(innerOffset == 0 || innerOffset == 1, "A wrong inner offset!");
nsINode* node = child->GetNode();
nsINode* parentNode = node->GetParentNode();
return parentNode ?
DOMPoint(parentNode, parentNode->IndexOf(node) + innerOffset) :
DOMPoint();
}
uint32_t
HyperTextAccessible::FindOffset(uint32_t aOffset, nsDirection aDirection,
nsSelectionAmount aAmount,
EWordMovementType aWordMovementType)
{
NS_ASSERTION(aDirection == eDirPrevious || aAmount != eSelectBeginLine,
"eSelectBeginLine should only be used with eDirPrevious");
// Find a leaf accessible frame to start with. PeekOffset wants this.
HyperTextAccessible* text = this;
Accessible* child = nullptr;
int32_t innerOffset = aOffset;
do {
int32_t childIdx = text->GetChildIndexAtOffset(innerOffset);
// We can have an empty text leaf as our only child. Since empty text
// leaves are not accessible we then have no children, but 0 is a valid
// innerOffset.
if (childIdx == -1) {
NS_ASSERTION(innerOffset == 0 && !text->ChildCount(), "No childIdx?");
return DOMPointToOffset(text->GetNode(), 0, aDirection == eDirNext);
}
child = text->GetChildAt(childIdx);
// HTML list items may need special processing because PeekOffset doesn't
// work with list bullets.
if (text->IsHTMLListItem()) {
HTMLLIAccessible* li = text->AsHTMLListItem();
if (child == li->Bullet()) {
// XXX: the logic is broken for multichar bullets in moving by
// char/cluster/word cases.
if (text != this) {
return aDirection == eDirPrevious ?
TransformOffset(text, 0, false) :
TransformOffset(text, 1, true);
}
if (aDirection == eDirPrevious)
return 0;
uint32_t nextOffset = GetChildOffset(1);
if (nextOffset == 0)
return 0;
switch (aAmount) {
case eSelectLine:
case eSelectEndLine:
// Ask a text leaf next (if not empty) to the bullet for an offset
// since list item may be multiline.
return nextOffset < CharacterCount() ?
FindOffset(nextOffset, aDirection, aAmount, aWordMovementType) :
nextOffset;
default:
return nextOffset;
}
}
}
innerOffset -= text->GetChildOffset(childIdx);
text = child->AsHyperText();
} while (text);
nsIFrame* childFrame = child->GetFrame();
if (!childFrame) {
NS_ERROR("No child frame");
return 0;
}
int32_t innerContentOffset = innerOffset;
if (child->IsTextLeaf()) {
NS_ASSERTION(childFrame->GetType() == nsGkAtoms::textFrame, "Wrong frame!");
RenderedToContentOffset(childFrame, innerOffset, &innerContentOffset);
}
nsIFrame* frameAtOffset = childFrame;
int32_t unusedOffsetInFrame = 0;
childFrame->GetChildFrameContainingOffset(innerContentOffset, true,
&unusedOffsetInFrame,
&frameAtOffset);
const bool kIsJumpLinesOk = true; // okay to jump lines
const bool kIsScrollViewAStop = false; // do not stop at scroll views
const bool kIsKeyboardSelect = true; // is keyboard selection
const bool kIsVisualBidi = false; // use visual order for bidi text
nsPeekOffsetStruct pos(aAmount, aDirection, innerContentOffset,
nsPoint(0, 0), kIsJumpLinesOk, kIsScrollViewAStop,
kIsKeyboardSelect, kIsVisualBidi,
false, aWordMovementType);
nsresult rv = frameAtOffset->PeekOffset(&pos);
// PeekOffset fails on last/first lines of the text in certain cases.
if (NS_FAILED(rv) && aAmount == eSelectLine) {
pos.mAmount = (aDirection == eDirNext) ? eSelectEndLine : eSelectBeginLine;
frameAtOffset->PeekOffset(&pos);
}
if (!pos.mResultContent) {
NS_ERROR("No result content!");
return 0;
}
// Turn the resulting DOM point into an offset.
uint32_t hyperTextOffset = DOMPointToOffset(pos.mResultContent,
pos.mContentOffset,
aDirection == eDirNext);
if (aDirection == eDirPrevious) {
// If we reached the end during search, this means we didn't find the DOM point
// and we're actually at the start of the paragraph
if (hyperTextOffset == CharacterCount())
return 0;
// PeekOffset stops right before bullet so return 0 to workaround it.
if (IsHTMLListItem() && aAmount == eSelectBeginLine &&
hyperTextOffset > 0) {
Accessible* prevOffsetChild = GetChildAtOffset(hyperTextOffset - 1);
if (prevOffsetChild == AsHTMLListItem()->Bullet())
return 0;
}
}
return hyperTextOffset;
}
uint32_t
HyperTextAccessible::FindLineBoundary(uint32_t aOffset,
EWhichLineBoundary aWhichLineBoundary)
{
// Note: empty last line doesn't have own frame (a previous line contains '\n'
// character instead) thus when it makes a difference we need to process this
// case separately (otherwise operations are performed on previous line).
switch (aWhichLineBoundary) {
case ePrevLineBegin: {
// Fetch a previous line and move to its start (as arrow up and home keys
// were pressed).
if (IsEmptyLastLineOffset(aOffset))
return FindOffset(aOffset, eDirPrevious, eSelectBeginLine);
uint32_t tmpOffset = FindOffset(aOffset, eDirPrevious, eSelectLine);
return FindOffset(tmpOffset, eDirPrevious, eSelectBeginLine);
}
case ePrevLineEnd: {
if (IsEmptyLastLineOffset(aOffset))
return aOffset - 1;
// If offset is at first line then return 0 (first line start).
uint32_t tmpOffset = FindOffset(aOffset, eDirPrevious, eSelectBeginLine);
if (tmpOffset == 0)
return 0;
// Otherwise move to end of previous line (as arrow up and end keys were
// pressed).
tmpOffset = FindOffset(aOffset, eDirPrevious, eSelectLine);
return FindOffset(tmpOffset, eDirNext, eSelectEndLine);
}
case eThisLineBegin:
if (IsEmptyLastLineOffset(aOffset))
return aOffset;
// Move to begin of the current line (as home key was pressed).
return FindOffset(aOffset, eDirPrevious, eSelectBeginLine);
case eThisLineEnd:
if (IsEmptyLastLineOffset(aOffset))
return aOffset;
// Move to end of the current line (as end key was pressed).
return FindOffset(aOffset, eDirNext, eSelectEndLine);
case eNextLineBegin: {
if (IsEmptyLastLineOffset(aOffset))
return aOffset;
// Move to begin of the next line if any (arrow down and home keys),
// otherwise end of the current line (arrow down only).
uint32_t tmpOffset = FindOffset(aOffset, eDirNext, eSelectLine);
if (tmpOffset == CharacterCount())
return tmpOffset;
return FindOffset(tmpOffset, eDirPrevious, eSelectBeginLine);
}
case eNextLineEnd: {
if (IsEmptyLastLineOffset(aOffset))
return aOffset;
// Move to next line end (as down arrow and end key were pressed).
uint32_t tmpOffset = FindOffset(aOffset, eDirNext, eSelectLine);
if (tmpOffset == CharacterCount())
return tmpOffset;
return FindOffset(tmpOffset, eDirNext, eSelectEndLine);
}
}
return 0;
}
void
HyperTextAccessible::TextBeforeOffset(int32_t aOffset,
AccessibleTextBoundary aBoundaryType,
int32_t* aStartOffset, int32_t* aEndOffset,
nsAString& aText)
{
*aStartOffset = *aEndOffset = 0;
aText.Truncate();
index_t convertedOffset = ConvertMagicOffset(aOffset);
if (!convertedOffset.IsValid() || convertedOffset > CharacterCount()) {
NS_ERROR("Wrong in offset!");
return;
}
uint32_t adjustedOffset = convertedOffset;
if (aOffset == nsIAccessibleText::TEXT_OFFSET_CARET)
adjustedOffset = AdjustCaretOffset(adjustedOffset);
switch (aBoundaryType) {
case nsIAccessibleText::BOUNDARY_CHAR:
if (convertedOffset != 0)
CharAt(convertedOffset - 1, aText, aStartOffset, aEndOffset);
break;
case nsIAccessibleText::BOUNDARY_WORD_START: {
// If the offset is a word start (except text length offset) then move
// backward to find a start offset (end offset is the given offset).
// Otherwise move backward twice to find both start and end offsets.
if (adjustedOffset == CharacterCount()) {
*aEndOffset = FindWordBoundary(adjustedOffset, eDirPrevious, eStartWord);
*aStartOffset = FindWordBoundary(*aEndOffset, eDirPrevious, eStartWord);
} else {
*aStartOffset = FindWordBoundary(adjustedOffset, eDirPrevious, eStartWord);
*aEndOffset = FindWordBoundary(*aStartOffset, eDirNext, eStartWord);
if (*aEndOffset != static_cast<int32_t>(adjustedOffset)) {
*aEndOffset = *aStartOffset;
*aStartOffset = FindWordBoundary(*aEndOffset, eDirPrevious, eStartWord);
}
}
TextSubstring(*aStartOffset, *aEndOffset, aText);
break;
}
case nsIAccessibleText::BOUNDARY_WORD_END: {
// Move word backward twice to find start and end offsets.
*aEndOffset = FindWordBoundary(convertedOffset, eDirPrevious, eEndWord);
*aStartOffset = FindWordBoundary(*aEndOffset, eDirPrevious, eEndWord);
TextSubstring(*aStartOffset, *aEndOffset, aText);
break;
}
case nsIAccessibleText::BOUNDARY_LINE_START:
*aStartOffset = FindLineBoundary(adjustedOffset, ePrevLineBegin);
*aEndOffset = FindLineBoundary(adjustedOffset, eThisLineBegin);
TextSubstring(*aStartOffset, *aEndOffset, aText);
break;
case nsIAccessibleText::BOUNDARY_LINE_END: {
*aEndOffset = FindLineBoundary(adjustedOffset, ePrevLineEnd);
int32_t tmpOffset = *aEndOffset;
// Adjust offset if line is wrapped.
if (*aEndOffset != 0 && !IsLineEndCharAt(*aEndOffset))
tmpOffset--;
*aStartOffset = FindLineBoundary(tmpOffset, ePrevLineEnd);
TextSubstring(*aStartOffset, *aEndOffset, aText);
break;
}
}
}
void
HyperTextAccessible::TextAtOffset(int32_t aOffset,
AccessibleTextBoundary aBoundaryType,
int32_t* aStartOffset, int32_t* aEndOffset,
nsAString& aText)
{
*aStartOffset = *aEndOffset = 0;
aText.Truncate();
uint32_t adjustedOffset = ConvertMagicOffset(aOffset);
if (adjustedOffset == std::numeric_limits<uint32_t>::max()) {
NS_ERROR("Wrong given offset!");
return;
}
switch (aBoundaryType) {
case nsIAccessibleText::BOUNDARY_CHAR:
// Return no char if caret is at the end of wrapped line (case of no line
// end character). Returning a next line char is confusing for AT.
if (aOffset == nsIAccessibleText::TEXT_OFFSET_CARET && IsCaretAtEndOfLine())
*aStartOffset = *aEndOffset = adjustedOffset;
else
CharAt(adjustedOffset, aText, aStartOffset, aEndOffset);
break;
case nsIAccessibleText::BOUNDARY_WORD_START:
if (aOffset == nsIAccessibleText::TEXT_OFFSET_CARET)
adjustedOffset = AdjustCaretOffset(adjustedOffset);
*aEndOffset = FindWordBoundary(adjustedOffset, eDirNext, eStartWord);
*aStartOffset = FindWordBoundary(*aEndOffset, eDirPrevious, eStartWord);
TextSubstring(*aStartOffset, *aEndOffset, aText);
break;
case nsIAccessibleText::BOUNDARY_WORD_END:
// Ignore the spec and follow what WebKitGtk does because Orca expects it,
// i.e. return a next word at word end offset of the current word
// (WebKitGtk behavior) instead the current word (AKT spec).
*aEndOffset = FindWordBoundary(adjustedOffset, eDirNext, eEndWord);
*aStartOffset = FindWordBoundary(*aEndOffset, eDirPrevious, eEndWord);
TextSubstring(*aStartOffset, *aEndOffset, aText);
break;
case nsIAccessibleText::BOUNDARY_LINE_START:
if (aOffset == nsIAccessibleText::TEXT_OFFSET_CARET)
adjustedOffset = AdjustCaretOffset(adjustedOffset);
*aStartOffset = FindLineBoundary(adjustedOffset, eThisLineBegin);
*aEndOffset = FindLineBoundary(adjustedOffset, eNextLineBegin);
TextSubstring(*aStartOffset, *aEndOffset, aText);
break;
case nsIAccessibleText::BOUNDARY_LINE_END:
if (aOffset == nsIAccessibleText::TEXT_OFFSET_CARET)
adjustedOffset = AdjustCaretOffset(adjustedOffset);
// In contrast to word end boundary we follow the spec here.
*aStartOffset = FindLineBoundary(adjustedOffset, ePrevLineEnd);
*aEndOffset = FindLineBoundary(adjustedOffset, eThisLineEnd);
TextSubstring(*aStartOffset, *aEndOffset, aText);
break;
}
}
void
HyperTextAccessible::TextAfterOffset(int32_t aOffset,
AccessibleTextBoundary aBoundaryType,
int32_t* aStartOffset, int32_t* aEndOffset,
nsAString& aText)
{
*aStartOffset = *aEndOffset = 0;
aText.Truncate();
index_t convertedOffset = ConvertMagicOffset(aOffset);
if (!convertedOffset.IsValid() || convertedOffset > CharacterCount()) {
NS_ERROR("Wrong in offset!");
return;
}
uint32_t adjustedOffset = convertedOffset;
if (aOffset == nsIAccessibleText::TEXT_OFFSET_CARET)
adjustedOffset = AdjustCaretOffset(adjustedOffset);
switch (aBoundaryType) {
case nsIAccessibleText::BOUNDARY_CHAR:
// If caret is at the end of wrapped line (case of no line end character)
// then char after the offset is a first char at next line.
if (adjustedOffset >= CharacterCount())
*aStartOffset = *aEndOffset = CharacterCount();
else
CharAt(adjustedOffset + 1, aText, aStartOffset, aEndOffset);
break;
case nsIAccessibleText::BOUNDARY_WORD_START:
// Move word forward twice to find start and end offsets.
*aStartOffset = FindWordBoundary(adjustedOffset, eDirNext, eStartWord);
*aEndOffset = FindWordBoundary(*aStartOffset, eDirNext, eStartWord);
TextSubstring(*aStartOffset, *aEndOffset, aText);
break;
case nsIAccessibleText::BOUNDARY_WORD_END:
// If the offset is a word end (except 0 offset) then move forward to find
// end offset (start offset is the given offset). Otherwise move forward
// twice to find both start and end offsets.
if (convertedOffset == 0) {
*aStartOffset = FindWordBoundary(convertedOffset, eDirNext, eEndWord);
*aEndOffset = FindWordBoundary(*aStartOffset, eDirNext, eEndWord);
} else {
*aEndOffset = FindWordBoundary(convertedOffset, eDirNext, eEndWord);
*aStartOffset = FindWordBoundary(*aEndOffset, eDirPrevious, eEndWord);
if (*aStartOffset != static_cast<int32_t>(convertedOffset)) {
*aStartOffset = *aEndOffset;
*aEndOffset = FindWordBoundary(*aStartOffset, eDirNext, eEndWord);
}
}
TextSubstring(*aStartOffset, *aEndOffset, aText);
break;
case nsIAccessibleText::BOUNDARY_LINE_START:
*aStartOffset = FindLineBoundary(adjustedOffset, eNextLineBegin);
*aEndOffset = FindLineBoundary(*aStartOffset, eNextLineBegin);
TextSubstring(*aStartOffset, *aEndOffset, aText);
break;
case nsIAccessibleText::BOUNDARY_LINE_END:
*aStartOffset = FindLineBoundary(adjustedOffset, eThisLineEnd);
*aEndOffset = FindLineBoundary(adjustedOffset, eNextLineEnd);
TextSubstring(*aStartOffset, *aEndOffset, aText);
break;
}
}
already_AddRefed<nsIPersistentProperties>
HyperTextAccessible::TextAttributes(bool aIncludeDefAttrs, int32_t aOffset,
int32_t* aStartOffset,
int32_t* aEndOffset)
{
// 1. Get each attribute and its ranges one after another.
// 2. As we get each new attribute, we pass the current start and end offsets
// as in/out parameters. In other words, as attributes are collected,
// the attribute range itself can only stay the same or get smaller.
*aStartOffset = *aEndOffset = 0;
index_t offset = ConvertMagicOffset(aOffset);
if (!offset.IsValid() || offset > CharacterCount()) {
NS_ERROR("Wrong in offset!");
return nullptr;
}
nsCOMPtr<nsIPersistentProperties> attributes =
do_CreateInstance(NS_PERSISTENTPROPERTIES_CONTRACTID);
Accessible* accAtOffset = GetChildAtOffset(offset);
if (!accAtOffset) {
// Offset 0 is correct offset when accessible has empty text. Include
// default attributes if they were requested, otherwise return empty set.
if (offset == 0) {
if (aIncludeDefAttrs) {
TextAttrsMgr textAttrsMgr(this);
textAttrsMgr.GetAttributes(attributes);
}
return attributes.forget();
}
return nullptr;
}
int32_t accAtOffsetIdx = accAtOffset->IndexInParent();
uint32_t startOffset = GetChildOffset(accAtOffsetIdx);
uint32_t endOffset = GetChildOffset(accAtOffsetIdx + 1);
int32_t offsetInAcc = offset - startOffset;
TextAttrsMgr textAttrsMgr(this, aIncludeDefAttrs, accAtOffset,
accAtOffsetIdx);
textAttrsMgr.GetAttributes(attributes, &startOffset, &endOffset);
// Compute spelling attributes on text accessible only.
nsIFrame *offsetFrame = accAtOffset->GetFrame();
if (offsetFrame && offsetFrame->GetType() == nsGkAtoms::textFrame) {
int32_t nodeOffset = 0;
RenderedToContentOffset(offsetFrame, offsetInAcc, &nodeOffset);
// Set 'misspelled' text attribute.
GetSpellTextAttr(accAtOffset->GetNode(), nodeOffset,
&startOffset, &endOffset, attributes);
}
*aStartOffset = startOffset;
*aEndOffset = endOffset;
return attributes.forget();
}
already_AddRefed<nsIPersistentProperties>
HyperTextAccessible::DefaultTextAttributes()
{
nsCOMPtr<nsIPersistentProperties> attributes =
do_CreateInstance(NS_PERSISTENTPROPERTIES_CONTRACTID);
TextAttrsMgr textAttrsMgr(this);
textAttrsMgr.GetAttributes(attributes);
return attributes.forget();
}
int32_t
HyperTextAccessible::GetLevelInternal()
{
nsIAtom *tag = mContent->Tag();
if (tag == nsGkAtoms::h1)
return 1;
if (tag == nsGkAtoms::h2)
return 2;
if (tag == nsGkAtoms::h3)
return 3;
if (tag == nsGkAtoms::h4)
return 4;
if (tag == nsGkAtoms::h5)
return 5;
if (tag == nsGkAtoms::h6)
return 6;
return AccessibleWrap::GetLevelInternal();
}
already_AddRefed<nsIPersistentProperties>
HyperTextAccessible::NativeAttributes()
{
nsCOMPtr<nsIPersistentProperties> attributes =
AccessibleWrap::NativeAttributes();
// 'formatting' attribute is deprecated, 'display' attribute should be
// instead.
nsIFrame *frame = GetFrame();
if (frame && frame->GetType() == nsGkAtoms::blockFrame) {
nsAutoString unused;
attributes->SetStringProperty(NS_LITERAL_CSTRING("formatting"),
NS_LITERAL_STRING("block"), unused);
}
if (FocusMgr()->IsFocused(this)) {
int32_t lineNumber = CaretLineNumber();
if (lineNumber >= 1) {
nsAutoString strLineNumber;
strLineNumber.AppendInt(lineNumber);
nsAccUtils::SetAccAttr(attributes, nsGkAtoms::lineNumber, strLineNumber);
}
}
if (!HasOwnContent())
return attributes.forget();
// For the html landmark elements we expose them like we do aria landmarks to
// make AT navigation schemes "just work".
nsIAtom* tag = mContent->Tag();
if (tag == nsGkAtoms::nav) {
nsAccUtils::SetAccAttr(attributes, nsGkAtoms::xmlroles,
NS_LITERAL_STRING("navigation"));
} else if (tag == nsGkAtoms::section) {
nsAccUtils::SetAccAttr(attributes, nsGkAtoms::xmlroles,
NS_LITERAL_STRING("region"));
} else if (tag == nsGkAtoms::header || tag == nsGkAtoms::footer) {
// Only map header and footer if they are not descendants
// of an article or section tag.
nsIContent* parent = mContent->GetParent();
while (parent) {
if (parent->Tag() == nsGkAtoms::article ||
parent->Tag() == nsGkAtoms::section)
break;
parent = parent->GetParent();
}
// No article or section elements found.
if (!parent) {
if (tag == nsGkAtoms::header) {
nsAccUtils::SetAccAttr(attributes, nsGkAtoms::xmlroles,
NS_LITERAL_STRING("banner"));
} else if (tag == nsGkAtoms::footer) {
nsAccUtils::SetAccAttr(attributes, nsGkAtoms::xmlroles,
NS_LITERAL_STRING("contentinfo"));
}
}
} else if (tag == nsGkAtoms::aside) {
nsAccUtils::SetAccAttr(attributes, nsGkAtoms::xmlroles,
NS_LITERAL_STRING("complementary"));
} else if (tag == nsGkAtoms::article) {
nsAccUtils::SetAccAttr(attributes, nsGkAtoms::xmlroles,
NS_LITERAL_STRING("article"));
} else if (tag == nsGkAtoms::main) {
nsAccUtils::SetAccAttr(attributes, nsGkAtoms::xmlroles,
NS_LITERAL_STRING("main"));
} else if (tag == nsGkAtoms::time) {
nsAccUtils::SetAccAttr(attributes, nsGkAtoms::xmlroles,
NS_LITERAL_STRING("time"));
if (mContent->HasAttr(kNameSpaceID_None, nsGkAtoms::datetime)) {
nsAutoString datetime;
mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::datetime, datetime);
nsAccUtils::SetAccAttr(attributes, nsGkAtoms::datetime, datetime);
}
}
return attributes.forget();
}
int32_t
HyperTextAccessible::OffsetAtPoint(int32_t aX, int32_t aY, uint32_t aCoordType)
{
nsIFrame* hyperFrame = GetFrame();
if (!hyperFrame)
return -1;
nsIntPoint coords = nsAccUtils::ConvertToScreenCoords(aX, aY, aCoordType,
this);
nsPresContext* presContext = mDoc->PresContext();
nsPoint coordsInAppUnits =
coords.ToAppUnits(presContext->AppUnitsPerDevPixel());
nsRect frameScreenRect = hyperFrame->GetScreenRectInAppUnits();
if (!frameScreenRect.Contains(coordsInAppUnits.x, coordsInAppUnits.y))
return -1; // Not found
nsPoint pointInHyperText(coordsInAppUnits.x - frameScreenRect.x,
coordsInAppUnits.y - frameScreenRect.y);
// Go through the frames to check if each one has the point.
// When one does, add up the character offsets until we have a match
// We have an point in an accessible child of this, now we need to add up the
// offsets before it to what we already have
int32_t offset = 0;
uint32_t childCount = ChildCount();
for (uint32_t childIdx = 0; childIdx < childCount; childIdx++) {
Accessible* childAcc = mChildren[childIdx];
nsIFrame *primaryFrame = childAcc->GetFrame();
NS_ENSURE_TRUE(primaryFrame, -1);
nsIFrame *frame = primaryFrame;
while (frame) {
nsIContent *content = frame->GetContent();
NS_ENSURE_TRUE(content, -1);
nsPoint pointInFrame = pointInHyperText - frame->GetOffsetTo(hyperFrame);
nsSize frameSize = frame->GetSize();
if (pointInFrame.x < frameSize.width && pointInFrame.y < frameSize.height) {
// Finished
if (frame->GetType() == nsGkAtoms::textFrame) {
nsIFrame::ContentOffsets contentOffsets =
frame->GetContentOffsetsFromPointExternal(pointInFrame, nsIFrame::IGNORE_SELECTION_STYLE);
if (contentOffsets.IsNull() || contentOffsets.content != content) {
return -1; // Not found
}
uint32_t addToOffset;
nsresult rv = ContentToRenderedOffset(primaryFrame,
contentOffsets.offset,
&addToOffset);
NS_ENSURE_SUCCESS(rv, -1);
offset += addToOffset;
}
return offset;
}
frame = frame->GetNextContinuation();
}
offset += nsAccUtils::TextLength(childAcc);
}
return -1; // Not found
}
nsIntRect
HyperTextAccessible::TextBounds(int32_t aStartOffset, int32_t aEndOffset,
uint32_t aCoordType)
{
index_t startOffset = ConvertMagicOffset(aStartOffset);
index_t endOffset = ConvertMagicOffset(aEndOffset);
if (!startOffset.IsValid() || !endOffset.IsValid() ||
startOffset > endOffset || endOffset > CharacterCount()) {
NS_ERROR("Wrong in offset");
return nsIntRect();
}
int32_t childIdx = GetChildIndexAtOffset(startOffset);
if (childIdx == -1)
return nsIntRect();
nsIntRect bounds;
int32_t prevOffset = GetChildOffset(childIdx);
int32_t offset1 = startOffset - prevOffset;
while (childIdx < static_cast<int32_t>(ChildCount())) {
nsIFrame* frame = GetChildAt(childIdx++)->GetFrame();
if (!frame) {
NS_NOTREACHED("No frame for a child!");
continue;
}
int32_t nextOffset = GetChildOffset(childIdx);
if (nextOffset >= static_cast<int32_t>(endOffset)) {
bounds.UnionRect(bounds, GetBoundsInFrame(frame, offset1,
endOffset - prevOffset));
break;
}
bounds.UnionRect(bounds, GetBoundsInFrame(frame, offset1,
nextOffset - prevOffset));
prevOffset = nextOffset;
offset1 = 0;
}
nsAccUtils::ConvertScreenCoordsTo(&bounds.x, &bounds.y, aCoordType, this);
return bounds;
}
already_AddRefed<nsIEditor>
HyperTextAccessible::GetEditor() const
{
if (!mContent->HasFlag(NODE_IS_EDITABLE)) {
// If we're inside an editable container, then return that container's editor
Accessible* ancestor = Parent();
while (ancestor) {
HyperTextAccessible* hyperText = ancestor->AsHyperText();
if (hyperText) {
// Recursion will stop at container doc because it has its own impl
// of GetEditor()
return hyperText->GetEditor();
}
ancestor = ancestor->Parent();
}
return nullptr;
}
nsCOMPtr<nsIDocShell> docShell = nsCoreUtils::GetDocShellFor(mContent);
nsCOMPtr<nsIEditingSession> editingSession(do_GetInterface(docShell));
if (!editingSession)
return nullptr; // No editing session interface
nsCOMPtr<nsIEditor> editor;
nsIDocument* docNode = mDoc->DocumentNode();
editingSession->GetEditorForWindow(docNode->GetWindow(),
getter_AddRefs(editor));
return editor.forget();
}
/**
* =================== Caret & Selection ======================
*/
nsresult
HyperTextAccessible::SetSelectionRange(int32_t aStartPos, int32_t aEndPos)
{
// Before setting the selection range, we need to ensure that the editor
// is initialized. (See bug 804927.)
// Otherwise, it's possible that lazy editor initialization will override
// the selection we set here and leave the caret at the end of the text.
// By calling GetEditor here, we ensure that editor initialization is
// completed before we set the selection.
nsCOMPtr<nsIEditor> editor = GetEditor();
bool isFocusable = InteractiveState() & states::FOCUSABLE;
// If accessible is focusable then focus it before setting the selection to
// neglect control's selection changes on focus if any (for example, inputs
// that do select all on focus).
// some input controls
if (isFocusable)
TakeFocus();
dom::Selection* domSel = DOMSelection();
NS_ENSURE_STATE(domSel);
// Set up the selection.
for (int32_t idx = domSel->GetRangeCount() - 1; idx > 0; idx--)
domSel->RemoveRange(domSel->GetRangeAt(idx));
SetSelectionBoundsAt(0, aStartPos, aEndPos);
// When selection is done, move the focus to the selection if accessible is
// not focusable. That happens when selection is set within hypertext
// accessible.
if (isFocusable)
return NS_OK;
nsFocusManager* DOMFocusManager = nsFocusManager::GetFocusManager();
if (DOMFocusManager) {
NS_ENSURE_TRUE(mDoc, NS_ERROR_FAILURE);
nsIDocument* docNode = mDoc->DocumentNode();
NS_ENSURE_TRUE(docNode, NS_ERROR_FAILURE);
nsCOMPtr<nsPIDOMWindow> window = docNode->GetWindow();
nsCOMPtr<nsIDOMElement> result;
DOMFocusManager->MoveFocus(window, nullptr, nsIFocusManager::MOVEFOCUS_CARET,
nsIFocusManager::FLAG_BYMOVEFOCUS, getter_AddRefs(result));
}
return NS_OK;
}
int32_t
HyperTextAccessible::CaretOffset() const
{
// Not focused focusable accessible except document accessible doesn't have
// a caret.
if (!IsDoc() && !FocusMgr()->IsFocused(this) &&
(InteractiveState() & states::FOCUSABLE)) {
return -1;
}
// Check cached value.
int32_t caretOffset = -1;
HyperTextAccessible* text = SelectionMgr()->AccessibleWithCaret(&caretOffset);
// Use cached value if it corresponds to this accessible.
if (caretOffset != -1) {
if (text == this)
return caretOffset;
nsINode* textNode = text->GetNode();
// Ignore offset if cached accessible isn't a text leaf.
if (nsCoreUtils::IsAncestorOf(GetNode(), textNode))
return TransformOffset(text,
textNode->IsNodeOfType(nsINode::eTEXT) ? caretOffset : 0, false);
}
// No caret if the focused node is not inside this DOM node and this DOM node
// is not inside of focused node.
FocusManager::FocusDisposition focusDisp =
FocusMgr()->IsInOrContainsFocus(this);
if (focusDisp == FocusManager::eNone)
return -1;
// Turn the focus node and offset of the selection into caret hypretext
// offset.
dom::Selection* domSel = DOMSelection();
NS_ENSURE_TRUE(domSel, -1);
nsINode* focusNode = domSel->GetFocusNode();
uint32_t focusOffset = domSel->FocusOffset();
// No caret if this DOM node is inside of focused node but the selection's
// focus point is not inside of this DOM node.
if (focusDisp == FocusManager::eContainedByFocus) {
nsINode* resultNode =
nsCoreUtils::GetDOMNodeFromDOMPoint(focusNode, focusOffset);
nsINode* thisNode = GetNode();
if (resultNode != thisNode &&
!nsCoreUtils::IsAncestorOf(thisNode, resultNode))
return -1;
}
return DOMPointToOffset(focusNode, focusOffset);
}
int32_t
HyperTextAccessible::CaretLineNumber()
{
// Provide the line number for the caret, relative to the
// currently focused node. Use a 1-based index
nsRefPtr<nsFrameSelection> frameSelection = FrameSelection();
if (!frameSelection)
return -1;
dom::Selection* domSel =
frameSelection->GetSelection(nsISelectionController::SELECTION_NORMAL);
if (!domSel)
return - 1;
nsINode* caretNode = domSel->GetFocusNode();
if (!caretNode || !caretNode->IsContent())
return -1;
nsIContent* caretContent = caretNode->AsContent();
if (!nsCoreUtils::IsAncestorOf(GetNode(), caretContent))
return -1;
int32_t returnOffsetUnused;
uint32_t caretOffset = domSel->FocusOffset();
CaretAssociationHint hint = frameSelection->GetHint();
nsIFrame *caretFrame = frameSelection->GetFrameForNodeOffset(caretContent, caretOffset,
hint, &returnOffsetUnused);
NS_ENSURE_TRUE(caretFrame, -1);
int32_t lineNumber = 1;
nsAutoLineIterator lineIterForCaret;
nsIContent *hyperTextContent = IsContent() ? mContent.get() : nullptr;
while (caretFrame) {
if (hyperTextContent == caretFrame->GetContent()) {
return lineNumber; // Must be in a single line hyper text, there is no line iterator
}
nsContainerFrame *parentFrame = caretFrame->GetParent();
if (!parentFrame)
break;
// Add lines for the sibling frames before the caret
nsIFrame *sibling = parentFrame->GetFirstPrincipalChild();
while (sibling && sibling != caretFrame) {
nsAutoLineIterator lineIterForSibling = sibling->GetLineIterator();
if (lineIterForSibling) {
// For the frames before that grab all the lines
int32_t addLines = lineIterForSibling->GetNumLines();
lineNumber += addLines;
}
sibling = sibling->GetNextSibling();
}
// Get the line number relative to the container with lines
if (!lineIterForCaret) { // Add the caret line just once
lineIterForCaret = parentFrame->GetLineIterator();
if (lineIterForCaret) {
// Ancestor of caret
int32_t addLines = lineIterForCaret->FindLineContaining(caretFrame);
lineNumber += addLines;
}
}
caretFrame = parentFrame;
}
NS_NOTREACHED("DOM ancestry had this hypertext but frame ancestry didn't");
return lineNumber;
}
nsIntRect
HyperTextAccessible::GetCaretRect(nsIWidget** aWidget)
{
*aWidget = nullptr;
nsRefPtr<nsCaret> caret = mDoc->PresShell()->GetCaret();
NS_ENSURE_TRUE(caret, nsIntRect());
bool isVisible = caret->IsVisible();
if (!isVisible)
return nsIntRect();
nsRect rect;
nsIFrame* frame = caret->GetGeometry(&rect);
if (!frame || rect.IsEmpty())
return nsIntRect();
nsPoint offset;
// Offset from widget origin to the frame origin, which includes chrome
// on the widget.
*aWidget = frame->GetNearestWidget(offset);
NS_ENSURE_TRUE(*aWidget, nsIntRect());
rect.MoveBy(offset);
nsIntRect caretRect;
caretRect = rect.ToOutsidePixels(frame->PresContext()->AppUnitsPerDevPixel());
// ((content screen origin) - (content offset in the widget)) = widget origin on the screen
caretRect.MoveBy((*aWidget)->WidgetToScreenOffsetUntyped() - (*aWidget)->GetClientOffset());
// Correct for character size, so that caret always matches the size of
// the character. This is important for font size transitions, and is
// necessary because the Gecko caret uses the previous character's size as
// the user moves forward in the text by character.
nsIntRect charRect = CharBounds(CaretOffset(),
nsIAccessibleCoordinateType::COORDTYPE_SCREEN_RELATIVE);
if (!charRect.IsEmpty()) {
caretRect.height -= charRect.y - caretRect.y;
caretRect.y = charRect.y;
}
return caretRect;
}
void
HyperTextAccessible::GetSelectionDOMRanges(int16_t aType,
nsTArray<nsRange*>* aRanges)
{
// Ignore selection if it is not visible.
nsRefPtr<nsFrameSelection> frameSelection = FrameSelection();
if (!frameSelection ||
frameSelection->GetDisplaySelection() <= nsISelectionController::SELECTION_HIDDEN)
return;
dom::Selection* domSel = frameSelection->GetSelection(aType);
if (!domSel)
return;
nsCOMPtr<nsINode> startNode = GetNode();
nsCOMPtr<nsIEditor> editor = GetEditor();
if (editor) {
nsCOMPtr<nsIDOMElement> editorRoot;
editor->GetRootElement(getter_AddRefs(editorRoot));
startNode = do_QueryInterface(editorRoot);
}
if (!startNode)
return;
uint32_t childCount = startNode->GetChildCount();
nsresult rv = domSel->
GetRangesForIntervalArray(startNode, 0, startNode, childCount, true, aRanges);
NS_ENSURE_SUCCESS_VOID(rv);
// Remove collapsed ranges
uint32_t numRanges = aRanges->Length();
for (uint32_t idx = 0; idx < numRanges; idx ++) {
if ((*aRanges)[idx]->Collapsed()) {
aRanges->RemoveElementAt(idx);
--numRanges;
--idx;
}
}
}
int32_t
HyperTextAccessible::SelectionCount()
{
nsTArray<nsRange*> ranges;
GetSelectionDOMRanges(nsISelectionController::SELECTION_NORMAL, &ranges);
return ranges.Length();
}
bool
HyperTextAccessible::SelectionBoundsAt(int32_t aSelectionNum,
int32_t* aStartOffset,
int32_t* aEndOffset)
{
*aStartOffset = *aEndOffset = 0;
nsTArray<nsRange*> ranges;
GetSelectionDOMRanges(nsISelectionController::SELECTION_NORMAL, &ranges);
uint32_t rangeCount = ranges.Length();
if (aSelectionNum < 0 || aSelectionNum >= static_cast<int32_t>(rangeCount))
return false;
nsRange* range = ranges[aSelectionNum];
// Get start and end points.
nsINode* startNode = range->GetStartParent();
nsINode* endNode = range->GetEndParent();
int32_t startOffset = range->StartOffset(), endOffset = range->EndOffset();
// Make sure start is before end, by swapping DOM points. This occurs when
// the user selects backwards in the text.
int32_t rangeCompare = nsContentUtils::ComparePoints(endNode, endOffset,
startNode, startOffset);
if (rangeCompare < 0) {
nsINode* tempNode = startNode;
startNode = endNode;
endNode = tempNode;
int32_t tempOffset = startOffset;
startOffset = endOffset;
endOffset = tempOffset;
}
if (!nsContentUtils::ContentIsDescendantOf(startNode, mContent))
*aStartOffset = 0;
else
*aStartOffset = DOMPointToOffset(startNode, startOffset);
if (!nsContentUtils::ContentIsDescendantOf(endNode, mContent))
*aEndOffset = CharacterCount();
else
*aEndOffset = DOMPointToOffset(endNode, endOffset, true);
return true;
}
bool
HyperTextAccessible::SetSelectionBoundsAt(int32_t aSelectionNum,
int32_t aStartOffset,
int32_t aEndOffset)
{
index_t startOffset = ConvertMagicOffset(aStartOffset);
index_t endOffset = ConvertMagicOffset(aEndOffset);
if (!startOffset.IsValid() || !endOffset.IsValid() ||
startOffset > endOffset || endOffset > CharacterCount()) {
NS_ERROR("Wrong in offset");
return false;
}
dom::Selection* domSel = DOMSelection();
if (!domSel)
return false;
nsRefPtr<nsRange> range;
uint32_t rangeCount = domSel->GetRangeCount();
if (aSelectionNum == static_cast<int32_t>(rangeCount))
range = new nsRange(mContent);
else
range = domSel->GetRangeAt(aSelectionNum);
if (!range)
return false;
if (!OffsetsToDOMRange(startOffset, endOffset, range))
return false;
// If new range was created then add it, otherwise notify selection listeners
// that existing selection range was changed.
if (aSelectionNum == static_cast<int32_t>(rangeCount))
return NS_SUCCEEDED(domSel->AddRange(range));
domSel->RemoveRange(range);
return NS_SUCCEEDED(domSel->AddRange(range));
}
bool
HyperTextAccessible::RemoveFromSelection(int32_t aSelectionNum)
{
dom::Selection* domSel = DOMSelection();
if (!domSel)
return false;
if (aSelectionNum < 0 || aSelectionNum >= domSel->GetRangeCount())
return false;
domSel->RemoveRange(domSel->GetRangeAt(aSelectionNum));
return true;
}
void
HyperTextAccessible::ScrollSubstringTo(int32_t aStartOffset, int32_t aEndOffset,
uint32_t aScrollType)
{
nsRefPtr<nsRange> range = new nsRange(mContent);
if (OffsetsToDOMRange(aStartOffset, aEndOffset, range))
nsCoreUtils::ScrollSubstringTo(GetFrame(), range, aScrollType);
}
void
HyperTextAccessible::ScrollSubstringToPoint(int32_t aStartOffset,
int32_t aEndOffset,
uint32_t aCoordinateType,
int32_t aX, int32_t aY)
{
nsIFrame *frame = GetFrame();
if (!frame)
return;
nsIntPoint coords = nsAccUtils::ConvertToScreenCoords(aX, aY, aCoordinateType,
this);
nsRefPtr<nsRange> range = new nsRange(mContent);
if (!OffsetsToDOMRange(aStartOffset, aEndOffset, range))
return;
nsPresContext* presContext = frame->PresContext();
nsPoint coordsInAppUnits =
coords.ToAppUnits(presContext->AppUnitsPerDevPixel());
bool initialScrolled = false;
nsIFrame *parentFrame = frame;
while ((parentFrame = parentFrame->GetParent())) {
nsIScrollableFrame *scrollableFrame = do_QueryFrame(parentFrame);
if (scrollableFrame) {
if (!initialScrolled) {
// Scroll substring to the given point. Turn the point into percents
// relative scrollable area to use nsCoreUtils::ScrollSubstringTo.
nsRect frameRect = parentFrame->GetScreenRectInAppUnits();
nscoord offsetPointX = coordsInAppUnits.x - frameRect.x;
nscoord offsetPointY = coordsInAppUnits.y - frameRect.y;
nsSize size(parentFrame->GetSize());
// avoid divide by zero
size.width = size.width ? size.width : 1;
size.height = size.height ? size.height : 1;
int16_t hPercent = offsetPointX * 100 / size.width;
int16_t vPercent = offsetPointY * 100 / size.height;
nsresult rv = nsCoreUtils::ScrollSubstringTo(frame, range,
nsIPresShell::ScrollAxis(vPercent),
nsIPresShell::ScrollAxis(hPercent));
if (NS_FAILED(rv))
return;
initialScrolled = true;
} else {
// Substring was scrolled to the given point already inside its closest
// scrollable area. If there are nested scrollable areas then make
// sure we scroll lower areas to the given point inside currently
// traversed scrollable area.
nsCoreUtils::ScrollFrameToPoint(parentFrame, frame, coords);
}
}
frame = parentFrame;
}
}
void
HyperTextAccessible::EnclosingRange(a11y::TextRange& aRange) const
{
if (IsTextField()) {
aRange.Set(mDoc, const_cast<HyperTextAccessible*>(this), 0,
const_cast<HyperTextAccessible*>(this), CharacterCount());
} else {
aRange.Set(mDoc, mDoc, 0, mDoc, mDoc->CharacterCount());
}
}
void
HyperTextAccessible::SelectionRanges(nsTArray<a11y::TextRange>* aRanges) const
{
NS_ASSERTION(aRanges->Length() != 0, "TextRange array supposed to be empty");
dom::Selection* sel = DOMSelection();
if (!sel)
return;
aRanges->SetCapacity(sel->RangeCount());
for (uint32_t idx = 0; idx < sel->RangeCount(); idx++) {
nsRange* DOMRange = sel->GetRangeAt(idx);
HyperTextAccessible* startParent =
nsAccUtils::GetTextContainer(DOMRange->GetStartParent());
HyperTextAccessible* endParent =
nsAccUtils::GetTextContainer(DOMRange->GetEndParent());
if (!startParent || !endParent)
continue;
int32_t startOffset =
startParent->DOMPointToOffset(DOMRange->GetStartParent(),
DOMRange->StartOffset(), false);
int32_t endOffset =
endParent->DOMPointToOffset(DOMRange->GetEndParent(),
DOMRange->EndOffset(), true);
TextRange tr(IsTextField() ? const_cast<HyperTextAccessible*>(this) : mDoc,
startParent, startOffset, endParent, endOffset);
*(aRanges->AppendElement()) = Move(tr);
}
}
void
HyperTextAccessible::VisibleRanges(nsTArray<a11y::TextRange>* aRanges) const
{
}
void
HyperTextAccessible::RangeByChild(Accessible* aChild,
a11y::TextRange& aRange) const
{
HyperTextAccessible* ht = aChild->AsHyperText();
if (ht) {
aRange.Set(mDoc, ht, 0, ht, ht->CharacterCount());
return;
}
Accessible* child = aChild;
Accessible* parent = nullptr;
while ((parent = child->Parent()) && !(ht = parent->AsHyperText()))
child = parent;
// If no text then return collapsed text range, otherwise return a range
// containing the text enclosed by the given child.
if (ht) {
int32_t childIdx = child->IndexInParent();
int32_t startOffset = ht->GetChildOffset(childIdx);
int32_t endOffset = child->IsTextLeaf() ?
ht->GetChildOffset(childIdx + 1) : startOffset;
aRange.Set(mDoc, ht, startOffset, ht, endOffset);
}
}
void
HyperTextAccessible::RangeAtPoint(int32_t aX, int32_t aY,
a11y::TextRange& aRange) const
{
Accessible* child = mDoc->ChildAtPoint(aX, aY, eDeepestChild);
if (!child)
return;
Accessible* parent = nullptr;
while ((parent = child->Parent()) && !parent->IsHyperText())
child = parent;
// Return collapsed text range for the point.
if (parent) {
HyperTextAccessible* ht = parent->AsHyperText();
int32_t offset = ht->GetChildOffset(child);
aRange.Set(mDoc, ht, offset, ht, offset);
}
}
////////////////////////////////////////////////////////////////////////////////
// Accessible public
// Accessible protected
ENameValueFlag
HyperTextAccessible::NativeName(nsString& aName)
{
// Check @alt attribute for invalid img elements.
bool hasImgAlt = false;
if (mContent->IsHTML(nsGkAtoms::img)) {
hasImgAlt = mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::alt, aName);
if (!aName.IsEmpty())
return eNameOK;
}
ENameValueFlag nameFlag = AccessibleWrap::NativeName(aName);
if (!aName.IsEmpty())
return nameFlag;
// Get name from title attribute for HTML abbr and acronym elements making it
// a valid name from markup. Otherwise their name isn't picked up by recursive
// name computation algorithm. See NS_OK_NAME_FROM_TOOLTIP.
if (IsAbbreviation() &&
mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::title, aName))
aName.CompressWhitespace();
return hasImgAlt ? eNoNameOnPurpose : eNameOK;
}
void
HyperTextAccessible::InvalidateChildren()
{
mOffsets.Clear();
AccessibleWrap::InvalidateChildren();
}
bool
HyperTextAccessible::RemoveChild(Accessible* aAccessible)
{
int32_t childIndex = aAccessible->IndexInParent();
int32_t count = mOffsets.Length() - childIndex;
if (count > 0)
mOffsets.RemoveElementsAt(childIndex, count);
return Accessible::RemoveChild(aAccessible);
}
void
HyperTextAccessible::CacheChildren()
{
// Trailing HTML br element don't play any difference. We don't need to expose
// it to AT (see bug https://bugzilla.mozilla.org/show_bug.cgi?id=899433#c16
// for details).
TreeWalker walker(this, mContent);
Accessible* child = nullptr;
Accessible* lastChild = nullptr;
while ((child = walker.NextChild())) {
if (lastChild)
AppendChild(lastChild);
lastChild = child;
}
if (lastChild) {
if (lastChild->IsHTMLBr())
Document()->UnbindFromDocument(lastChild);
else
AppendChild(lastChild);
}
}
////////////////////////////////////////////////////////////////////////////////
// HyperTextAccessible public static
nsresult
HyperTextAccessible::ContentToRenderedOffset(nsIFrame* aFrame, int32_t aContentOffset,
uint32_t* aRenderedOffset) const
{
if (!aFrame) {
// Current frame not rendered -- this can happen if text is set on
// something with display: none
*aRenderedOffset = 0;
return NS_OK;
}
if (IsTextField()) {
*aRenderedOffset = aContentOffset;
return NS_OK;
}
NS_ASSERTION(aFrame->GetType() == nsGkAtoms::textFrame,
"Need text frame for offset conversion");
NS_ASSERTION(aFrame->GetPrevContinuation() == nullptr,
"Call on primary frame only");
gfxSkipChars skipChars;
gfxSkipCharsIterator iter;
// Only get info up to original offset, we know that will be larger than skipped offset
nsresult rv = aFrame->GetRenderedText(nullptr, &skipChars, &iter, 0, aContentOffset);
NS_ENSURE_SUCCESS(rv, rv);
uint32_t ourRenderedStart = iter.GetSkippedOffset();
int32_t ourContentStart = iter.GetOriginalOffset();
*aRenderedOffset = iter.ConvertOriginalToSkipped(aContentOffset + ourContentStart) -
ourRenderedStart;
return NS_OK;
}
nsresult
HyperTextAccessible::RenderedToContentOffset(nsIFrame* aFrame, uint32_t aRenderedOffset,
int32_t* aContentOffset) const
{
if (IsTextField()) {
*aContentOffset = aRenderedOffset;
return NS_OK;
}
*aContentOffset = 0;
NS_ENSURE_TRUE(aFrame, NS_ERROR_FAILURE);
NS_ASSERTION(aFrame->GetType() == nsGkAtoms::textFrame,
"Need text frame for offset conversion");
NS_ASSERTION(aFrame->GetPrevContinuation() == nullptr,
"Call on primary frame only");
gfxSkipChars skipChars;
gfxSkipCharsIterator iter;
// We only need info up to skipped offset -- that is what we're converting to original offset
nsresult rv = aFrame->GetRenderedText(nullptr, &skipChars, &iter, 0, aRenderedOffset);
NS_ENSURE_SUCCESS(rv, rv);
uint32_t ourRenderedStart = iter.GetSkippedOffset();
int32_t ourContentStart = iter.GetOriginalOffset();
*aContentOffset = iter.ConvertSkippedToOriginal(aRenderedOffset + ourRenderedStart) - ourContentStart;
return NS_OK;
}
////////////////////////////////////////////////////////////////////////////////
// HyperTextAccessible public
int32_t
HyperTextAccessible::GetChildOffset(uint32_t aChildIndex,
bool aInvalidateAfter) const
{
if (aChildIndex == 0) {
if (aInvalidateAfter)
mOffsets.Clear();
return aChildIndex;
}
int32_t count = mOffsets.Length() - aChildIndex;
if (count > 0) {
if (aInvalidateAfter)
mOffsets.RemoveElementsAt(aChildIndex, count);
return mOffsets[aChildIndex - 1];
}
uint32_t lastOffset = mOffsets.IsEmpty() ?
0 : mOffsets[mOffsets.Length() - 1];
while (mOffsets.Length() < aChildIndex) {
Accessible* child = mChildren[mOffsets.Length()];
lastOffset += nsAccUtils::TextLength(child);
mOffsets.AppendElement(lastOffset);
}
return mOffsets[aChildIndex - 1];
}
int32_t
HyperTextAccessible::GetChildIndexAtOffset(uint32_t aOffset) const
{
uint32_t lastOffset = 0;
const uint32_t offsetCount = mOffsets.Length();
if (offsetCount > 0) {
lastOffset = mOffsets[offsetCount - 1];
if (aOffset < lastOffset) {
size_t index;
if (BinarySearch(mOffsets, 0, offsetCount, aOffset, &index)) {
return (index < (offsetCount - 1)) ? index + 1 : index;
}
return (index == offsetCount) ? -1 : index;
}
}
uint32_t childCount = ChildCount();
while (mOffsets.Length() < childCount) {
Accessible* child = GetChildAt(mOffsets.Length());
lastOffset += nsAccUtils::TextLength(child);
mOffsets.AppendElement(lastOffset);
if (aOffset < lastOffset)
return mOffsets.Length() - 1;
}
if (aOffset == lastOffset)
return mOffsets.Length() - 1;
return -1;
}
////////////////////////////////////////////////////////////////////////////////
// HyperTextAccessible protected
nsresult
HyperTextAccessible::GetDOMPointByFrameOffset(nsIFrame* aFrame, int32_t aOffset,
Accessible* aAccessible,
DOMPoint* aPoint)
{
NS_ENSURE_ARG(aAccessible);
if (!aFrame) {
// If the given frame is null then set offset after the DOM node of the
// given accessible.
NS_ASSERTION(!aAccessible->IsDoc(),
"Shouldn't be called on document accessible!");
nsIContent* content = aAccessible->GetContent();
NS_ASSERTION(content, "Shouldn't operate on defunct accessible!");
nsIContent* parent = content->GetParent();
aPoint->idx = parent->IndexOf(content) + 1;
aPoint->node = parent;
} else if (aFrame->GetType() == nsGkAtoms::textFrame) {
nsIContent* content = aFrame->GetContent();
NS_ENSURE_STATE(content);
nsIFrame *primaryFrame = content->GetPrimaryFrame();
nsresult rv = RenderedToContentOffset(primaryFrame, aOffset, &(aPoint->idx));
NS_ENSURE_SUCCESS(rv, rv);
aPoint->node = content;
} else {
nsIContent* content = aFrame->GetContent();
NS_ENSURE_STATE(content);
nsIContent* parent = content->GetParent();
NS_ENSURE_STATE(parent);
aPoint->idx = parent->IndexOf(content);
aPoint->node = parent;
}
return NS_OK;
}
// HyperTextAccessible
void
HyperTextAccessible::GetSpellTextAttr(nsINode* aNode,
int32_t aNodeOffset,
uint32_t* aStartOffset,
uint32_t* aEndOffset,
nsIPersistentProperties* aAttributes)
{
nsRefPtr<nsFrameSelection> fs = FrameSelection();
if (!fs)
return;
dom::Selection* domSel = fs->GetSelection(nsISelectionController::SELECTION_SPELLCHECK);
if (!domSel)
return;
int32_t rangeCount = domSel->GetRangeCount();
if (rangeCount <= 0)
return;
uint32_t startOffset = 0, endOffset = 0;
for (int32_t idx = 0; idx < rangeCount; idx++) {
nsRange* range = domSel->GetRangeAt(idx);
if (range->Collapsed())
continue;
// See if the point comes after the range in which case we must continue in
// case there is another range after this one.
nsINode* endNode = range->GetEndParent();
int32_t endNodeOffset = range->EndOffset();
if (nsContentUtils::ComparePoints(aNode, aNodeOffset,
endNode, endNodeOffset) >= 0)
continue;
// At this point our point is either in this range or before it but after
// the previous range. So we check to see if the range starts before the
// point in which case the point is in the missspelled range, otherwise it
// must be before the range and after the previous one if any.
nsINode* startNode = range->GetStartParent();
int32_t startNodeOffset = range->StartOffset();
if (nsContentUtils::ComparePoints(startNode, startNodeOffset, aNode,
aNodeOffset) <= 0) {
startOffset = DOMPointToOffset(startNode, startNodeOffset);
endOffset = DOMPointToOffset(endNode, endNodeOffset);
if (startOffset > *aStartOffset)
*aStartOffset = startOffset;
if (endOffset < *aEndOffset)
*aEndOffset = endOffset;
if (aAttributes) {
nsAccUtils::SetAccAttr(aAttributes, nsGkAtoms::invalid,
NS_LITERAL_STRING("spelling"));
}
return;
}
// This range came after the point.
endOffset = DOMPointToOffset(startNode, startNodeOffset);
if (idx > 0) {
nsRange* prevRange = domSel->GetRangeAt(idx - 1);
startOffset = DOMPointToOffset(prevRange->GetEndParent(),
prevRange->EndOffset());
}
if (startOffset > *aStartOffset)
*aStartOffset = startOffset;
if (endOffset < *aEndOffset)
*aEndOffset = endOffset;
return;
}
// We never found a range that ended after the point, therefore we know that
// the point is not in a range, that we do not need to compute an end offset,
// and that we should use the end offset of the last range to compute the
// start offset of the text attribute range.
nsRange* prevRange = domSel->GetRangeAt(rangeCount - 1);
startOffset = DOMPointToOffset(prevRange->GetEndParent(),
prevRange->EndOffset());
if (startOffset > *aStartOffset)
*aStartOffset = startOffset;
}
bool
HyperTextAccessible::IsTextRole()
{
if (mRoleMapEntry &&
(mRoleMapEntry->role == roles::GRAPHIC ||
mRoleMapEntry->role == roles::IMAGE_MAP ||
mRoleMapEntry->role == roles::SLIDER ||
mRoleMapEntry->role == roles::PROGRESSBAR ||
mRoleMapEntry->role == roles::SEPARATOR))
return false;
return true;
}
Ссылка в новой задаче Показать git blame Копировать постоянную ссылку