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fune/accessible/generic/HyperTextAccessible.cpp
Masayuki Nakano 657bc8f9d5 Bug 1878191 - Fix 2 iterating loops of selection ranges r=smaug,Jamie 
These loops may run script.

In  `HyperTextAccessible`, it calls
`RemoveRangeAndUnselectFramesAndNotifyListeners`. So, chrome script which is not
directly related to this module may run in each call.  I think that using
`RemoveAllRanges` is better for here.  Before bug 1735446, this loop tried
to keep first range, but accidentally, I changed this loop delete all ranges.
However, `SetSelectionBoundsAt` will add a range if it's required and there is
no bug reports.  Therefore, I think keep the new behavior is better.

In `nsRange::DeleteFromDocument`, the loop may run mutation events too.
Therefore, it needs to store all ranges first.  Then, the preceding patch
changes the behavior here if a selection range is moved to different root.
Previously, it was deleted, but now, they are not touched.

Depends on D200606

Differential Revision: https://phabricator.services.mozilla.com/D200607
2024-02-07 04:34:38 +00:00

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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=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 "nsAccessibilityService.h"
#include "nsIAccessibleTypes.h"
#include "AccAttributes.h"
#include "HTMLListAccessible.h"
#include "LocalAccessible-inl.h"
#include "Relation.h"
#include "mozilla/a11y/Role.h"
#include "States.h"
#include "TextAttrs.h"
#include "TextRange.h"
#include "TreeWalker.h"
#include "nsCaret.h"
#include "nsContentUtils.h"
#include "nsDebug.h"
#include "nsFocusManager.h"
#include "nsIEditingSession.h"
#include "nsContainerFrame.h"
#include "nsFrameSelection.h"
#include "nsILineIterator.h"
#include "nsIScrollableFrame.h"
#include "nsIMathMLFrame.h"
#include "nsLayoutUtils.h"
#include "nsRange.h"
#include "mozilla/Assertions.h"
#include "mozilla/EditorBase.h"
#include "mozilla/HTMLEditor.h"
#include "mozilla/IntegerRange.h"
#include "mozilla/PresShell.h"
#include "mozilla/SelectionMovementUtils.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/HTMLBRElement.h"
#include "mozilla/dom/Selection.h"
#include "gfxSkipChars.h"
using namespace mozilla;
using namespace mozilla::a11y;
////////////////////////////////////////////////////////////////////////////////
// HyperTextAccessible
////////////////////////////////////////////////////////////////////////////////
HyperTextAccessible::HyperTextAccessible(nsIContent* aNode, DocAccessible* aDoc)
: AccessibleWrap(aNode, aDoc) {
mType = eHyperTextType;
mGenericTypes |= eHyperText;
}
role HyperTextAccessible::NativeRole() const {
a11y::role r = GetAccService()->MarkupRole(mContent);
if (r != roles::NOTHING) return r;
nsIFrame* frame = GetFrame();
if (frame && frame->IsInlineFrame()) return roles::TEXT;
return roles::TEXT_CONTAINER;
}
uint64_t HyperTextAccessible::NativeState() const {
uint64_t states = AccessibleWrap::NativeState();
if (IsEditable()) {
states |= states::EDITABLE;
} else if (mContent->IsHTMLElement(nsGkAtoms::article)) {
// We want <article> to behave like a document in terms of readonly state.
states |= states::READONLY;
}
nsIFrame* frame = GetFrame();
if ((states & states::EDITABLE) || (frame && frame->IsSelectable(nullptr))) {
// If the accessible is editable the layout selectable state only disables
// mouse selection, but keyboard (shift+arrow) selection is still possible.
states |= states::SELECTABLE_TEXT;
}
return states;
}
bool HyperTextAccessible::IsEditable() const {
if (!mContent) {
return false;
}
return mContent->AsElement()->State().HasState(dom::ElementState::READWRITE);
}
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->IsText()) {
// 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_Deprecated(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)
LocalAccessible* descendant = nullptr;
if (findNode) {
dom::HTMLBRElement* brElement = dom::HTMLBRElement::FromNode(findNode);
if (brElement && brElement->IsPaddingForEmptyEditor()) {
// This <br> is the hacky "padding <br> element" used when there is no
// text in the editor.
return 0;
}
descendant = mDoc->GetAccessible(findNode);
if (!descendant && findNode->IsContent()) {
LocalAccessible* container = mDoc->GetContainerAccessible(findNode);
if (container) {
TreeWalker walker(container, findNode->AsContent(),
TreeWalker::eWalkContextTree);
descendant = walker.Next();
if (!descendant) descendant = container;
}
}
}
return TransformOffset(descendant, offset, aIsEndOffset);
}
uint32_t HyperTextAccessible::TransformOffset(LocalAccessible* aDescendant,
uint32_t aOffset,
bool aIsEndOffset) const {
// From the descendant, go up and get the immediate child of this hypertext.
uint32_t offset = aOffset;
LocalAccessible* descendant = aDescendant;
while (descendant) {
LocalAccessible* parent = descendant->LocalParent();
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) {
// Similar to our special casing in FindOffset, we add handling for
// bulleted lists here because PeekOffset returns the inner text node
// for a list when it should return the list bullet.
// We manually set the offset so the error doesn't propagate up.
if (offset == 0 && parent && parent->IsHTMLListItem() &&
descendant->LocalPrevSibling() &&
descendant->LocalPrevSibling() ==
parent->AsHTMLListItem()->Bullet()) {
offset = 0;
} else {
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();
}
DOMPoint HyperTextAccessible::OffsetToDOMPoint(int32_t aOffset) const {
// 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) {
RefPtr<EditorBase> editorBase = GetEditor();
if (editorBase) {
if (editorBase->IsEmpty()) {
return DOMPoint(editorBase->GetRoot(), 0);
}
}
}
int32_t childIdx = GetChildIndexAtOffset(aOffset);
if (childIdx == -1) return DOMPoint();
LocalAccessible* child = LocalChildAt(childIdx);
int32_t innerOffset = aOffset - GetChildOffset(childIdx);
// A text leaf case.
if (child->IsTextLeaf()) {
// The point is inside the text node. This is always true for any text leaf
// except a last child one. See assertion below.
if (aOffset < GetChildOffset(childIdx + 1)) {
nsIContent* content = child->GetContent();
int32_t idx = 0;
if (NS_FAILED(RenderedToContentOffset(content->GetPrimaryFrame(),
innerOffset, &idx))) {
return DOMPoint();
}
return DOMPoint(content, idx);
}
// Set the DOM point right after the text node.
MOZ_ASSERT(static_cast<uint32_t>(aOffset) == CharacterCount());
innerOffset = 1;
}
// 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->ComputeIndexOf_Deprecated(node) +
innerOffset)
: DOMPoint();
}
already_AddRefed<AccAttributes> HyperTextAccessible::DefaultTextAttributes() {
RefPtr<AccAttributes> attributes = new AccAttributes();
TextAttrsMgr textAttrsMgr(this);
textAttrsMgr.GetAttributes(attributes);
return attributes.forget();
}
void HyperTextAccessible::SetMathMLXMLRoles(AccAttributes* aAttributes) {
// Add MathML xmlroles based on the position inside the parent.
LocalAccessible* parent = LocalParent();
if (parent) {
switch (parent->Role()) {
case roles::MATHML_CELL:
case roles::MATHML_ENCLOSED:
case roles::MATHML_ERROR:
case roles::MATHML_MATH:
case roles::MATHML_ROW:
case roles::MATHML_SQUARE_ROOT:
case roles::MATHML_STYLE:
if (Role() == roles::MATHML_OPERATOR) {
// This is an operator inside an <mrow> (or an inferred <mrow>).
// See http://www.w3.org/TR/MathML3/chapter3.html#presm.inferredmrow
// XXX We should probably do something similar for MATHML_FENCED, but
// operators do not appear in the accessible tree. See bug 1175747.
nsIMathMLFrame* mathMLFrame = do_QueryFrame(GetFrame());
if (mathMLFrame) {
nsEmbellishData embellishData;
mathMLFrame->GetEmbellishData(embellishData);
if (NS_MATHML_EMBELLISH_IS_FENCE(embellishData.flags)) {
if (!LocalPrevSibling()) {
aAttributes->SetAttribute(nsGkAtoms::xmlroles,
nsGkAtoms::open_fence);
} else if (!LocalNextSibling()) {
aAttributes->SetAttribute(nsGkAtoms::xmlroles,
nsGkAtoms::close_fence);
}
}
if (NS_MATHML_EMBELLISH_IS_SEPARATOR(embellishData.flags)) {
aAttributes->SetAttribute(nsGkAtoms::xmlroles,
nsGkAtoms::separator_);
}
}
}
break;
case roles::MATHML_FRACTION:
aAttributes->SetAttribute(
nsGkAtoms::xmlroles, IndexInParent() == 0 ? nsGkAtoms::numerator
: nsGkAtoms::denominator);
break;
case roles::MATHML_ROOT:
aAttributes->SetAttribute(
nsGkAtoms::xmlroles,
IndexInParent() == 0 ? nsGkAtoms::base : nsGkAtoms::root_index);
break;
case roles::MATHML_SUB:
aAttributes->SetAttribute(
nsGkAtoms::xmlroles,
IndexInParent() == 0 ? nsGkAtoms::base : nsGkAtoms::subscript);
break;
case roles::MATHML_SUP:
aAttributes->SetAttribute(
nsGkAtoms::xmlroles,
IndexInParent() == 0 ? nsGkAtoms::base : nsGkAtoms::superscript);
break;
case roles::MATHML_SUB_SUP: {
int32_t index = IndexInParent();
aAttributes->SetAttribute(
nsGkAtoms::xmlroles,
index == 0
? nsGkAtoms::base
: (index == 1 ? nsGkAtoms::subscript : nsGkAtoms::superscript));
} break;
case roles::MATHML_UNDER:
aAttributes->SetAttribute(
nsGkAtoms::xmlroles,
IndexInParent() == 0 ? nsGkAtoms::base : nsGkAtoms::underscript);
break;
case roles::MATHML_OVER:
aAttributes->SetAttribute(
nsGkAtoms::xmlroles,
IndexInParent() == 0 ? nsGkAtoms::base : nsGkAtoms::overscript);
break;
case roles::MATHML_UNDER_OVER: {
int32_t index = IndexInParent();
aAttributes->SetAttribute(nsGkAtoms::xmlroles,
index == 0
? nsGkAtoms::base
: (index == 1 ? nsGkAtoms::underscript
: nsGkAtoms::overscript));
} break;
case roles::MATHML_MULTISCRIPTS: {
// Get the <multiscripts> base.
nsIContent* child;
bool baseFound = false;
for (child = parent->GetContent()->GetFirstChild(); child;
child = child->GetNextSibling()) {
if (child->IsMathMLElement()) {
baseFound = true;
break;
}
}
if (baseFound) {
nsIContent* content = GetContent();
if (child == content) {
// We are the base.
aAttributes->SetAttribute(nsGkAtoms::xmlroles, nsGkAtoms::base);
} else {
// Browse the list of scripts to find us and determine our type.
bool postscript = true;
bool subscript = true;
for (child = child->GetNextSibling(); child;
child = child->GetNextSibling()) {
if (!child->IsMathMLElement()) continue;
if (child->IsMathMLElement(nsGkAtoms::mprescripts_)) {
postscript = false;
subscript = true;
continue;
}
if (child == content) {
if (postscript) {
aAttributes->SetAttribute(nsGkAtoms::xmlroles,
subscript ? nsGkAtoms::subscript
: nsGkAtoms::superscript);
} else {
aAttributes->SetAttribute(nsGkAtoms::xmlroles,
subscript
? nsGkAtoms::presubscript
: nsGkAtoms::presuperscript);
}
break;
}
subscript = !subscript;
}
}
}
} break;
default:
break;
}
}
}
already_AddRefed<AccAttributes> HyperTextAccessible::NativeAttributes() {
RefPtr<AccAttributes> attributes = AccessibleWrap::NativeAttributes();
// 'formatting' attribute is deprecated, 'display' attribute should be
// instead.
nsIFrame* frame = GetFrame();
if (frame && frame->IsBlockFrame()) {
attributes->SetAttribute(nsGkAtoms::formatting, nsGkAtoms::block);
}
if (FocusMgr()->IsFocused(this)) {
int32_t lineNumber = CaretLineNumber();
if (lineNumber >= 1) {
attributes->SetAttribute(nsGkAtoms::lineNumber, lineNumber);
}
}
if (HasOwnContent()) {
GetAccService()->MarkupAttributes(this, attributes);
if (mContent->IsMathMLElement()) SetMathMLXMLRoles(attributes);
}
return attributes.forget();
}
int32_t HyperTextAccessible::OffsetAtPoint(int32_t aX, int32_t aY,
uint32_t aCoordType) {
nsIFrame* hyperFrame = GetFrame();
if (!hyperFrame) return -1;
LayoutDeviceIntPoint coords =
nsAccUtils::ConvertToScreenCoords(aX, aY, aCoordType, this);
nsPresContext* presContext = mDoc->PresContext();
nsPoint coordsInAppUnits = LayoutDeviceIntPoint::ToAppUnits(
coords, 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++) {
LocalAccessible* 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->IsTextFrame()) {
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
}
already_AddRefed<EditorBase> HyperTextAccessible::GetEditor() const {
if (!mContent->HasFlag(NODE_IS_EDITABLE)) {
// If we're inside an editable container, then return that container's
// editor
LocalAccessible* ancestor = LocalParent();
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->LocalParent();
}
return nullptr;
}
nsCOMPtr<nsIDocShell> docShell = nsCoreUtils::GetDocShellFor(mContent);
nsCOMPtr<nsIEditingSession> editingSession;
docShell->GetEditingSession(getter_AddRefs(editingSession));
if (!editingSession) return nullptr; // No editing session interface
dom::Document* docNode = mDoc->DocumentNode();
RefPtr<HTMLEditor> htmlEditor =
editingSession->GetHTMLEditorForWindow(docNode->GetWindow());
return htmlEditor.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.
RefPtr<EditorBase> editorBase = 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();
RefPtr<dom::Selection> domSel = DOMSelection();
NS_ENSURE_STATE(domSel);
// Set up the selection.
domSel->RemoveAllRanges(IgnoreErrors());
SetSelectionBoundsAt(0, aStartPos, aEndPos);
// Make sure it is visible
domSel->ScrollIntoView(nsISelectionController::SELECTION_FOCUS_REGION,
ScrollAxis(), ScrollAxis(),
dom::Selection::SCROLL_FOR_CARET_MOVE |
dom::Selection::SCROLL_OVERFLOW_HIDDEN);
// 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);
dom::Document* docNode = mDoc->DocumentNode();
NS_ENSURE_TRUE(docNode, NS_ERROR_FAILURE);
nsCOMPtr<nsPIDOMWindowOuter> window = docNode->GetWindow();
RefPtr<dom::Element> 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->IsText() ? 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
RefPtr<nsFrameSelection> frameSelection = FrameSelection();
if (!frameSelection) return -1;
dom::Selection* domSel = frameSelection->GetSelection(SelectionType::eNormal);
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;
uint32_t caretOffset = domSel->FocusOffset();
CaretAssociationHint hint = frameSelection->GetHint();
nsIFrame* caretFrame = SelectionMovementUtils::GetFrameForNodeOffset(
caretContent, caretOffset, hint);
NS_ENSURE_TRUE(caretFrame, -1);
AutoAssertNoDomMutations guard; // The nsILineIterators below will break if
// the DOM is modified while they're in use!
int32_t lineNumber = 1;
nsILineIterator* lineIterForCaret = nullptr;
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->PrincipalChildList().FirstChild();
while (sibling && sibling != caretFrame) {
nsILineIterator* 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;
}
MOZ_ASSERT_UNREACHABLE(
"DOM ancestry had this hypertext but frame ancestry didn't");
return lineNumber;
}
LayoutDeviceIntRect HyperTextAccessible::GetCaretRect(nsIWidget** aWidget) {
*aWidget = nullptr;
RefPtr<nsCaret> caret = mDoc->PresShellPtr()->GetCaret();
NS_ENSURE_TRUE(caret, LayoutDeviceIntRect());
bool isVisible = caret->IsVisible();
if (!isVisible) return LayoutDeviceIntRect();
nsRect rect;
nsIFrame* frame = caret->GetGeometry(&rect);
if (!frame || rect.IsEmpty()) return LayoutDeviceIntRect();
PresShell* presShell = mDoc->PresShellPtr();
// Transform rect to be relative to the root frame.
nsIFrame* rootFrame = presShell->GetRootFrame();
rect = nsLayoutUtils::TransformFrameRectToAncestor(frame, rect, rootFrame);
// We need to inverse translate with the offset of the edge of the visual
// viewport from top edge of the layout viewport.
nsPoint viewportOffset = presShell->GetVisualViewportOffset() -
presShell->GetLayoutViewportOffset();
rect.MoveBy(-viewportOffset);
// We need to take into account a non-1 resolution set on the presshell.
// This happens with async pinch zooming. Here we scale the bounds before
// adding the screen-relative offset.
rect.ScaleRoundOut(presShell->GetResolution());
// Now we need to put the rect in absolute screen coords.
nsRect rootScreenRect = rootFrame->GetScreenRectInAppUnits();
rect.MoveBy(rootScreenRect.TopLeft());
// Finally, convert from app units.
auto caretRect = LayoutDeviceIntRect::FromAppUnitsToNearest(
rect, presShell->GetPresContext()->AppUnitsPerDevPixel());
// 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.
int32_t caretOffset = CaretOffset();
if (NS_WARN_IF(caretOffset == -1)) {
// The caret offset will be -1 if this Accessible isn't focused. Note that
// the DOM node contaning the caret might be focused, but the Accessible
// might not be; e.g. due to an autocomplete popup suggestion having a11y
// focus.
return LayoutDeviceIntRect();
}
LayoutDeviceIntRect charRect = CharBounds(
caretOffset, nsIAccessibleCoordinateType::COORDTYPE_SCREEN_RELATIVE);
if (!charRect.IsEmpty()) {
caretRect.SetTopEdge(charRect.Y());
}
*aWidget = frame->GetNearestWidget();
return caretRect;
}
void HyperTextAccessible::GetSelectionDOMRanges(SelectionType aSelectionType,
nsTArray<nsRange*>* aRanges) {
if (IsDoc() && !AsDoc()->HasLoadState(DocAccessible::eTreeConstructed)) {
// Rarely, a client query can be handled after a DocAccessible is created
// but before the initial tree is constructed, since DoInitialUpdate happens
// during a refresh tick. In that case, there might be a DOM selection, but
// we can't use it. We will crash if we try due to mContent being null, etc.
// This should only happen in the parent process because we should never
// try to push the cache in a content process before the initial tree is
// constructed.
MOZ_ASSERT(XRE_IsParentProcess(), "Query before DoInitialUpdate");
return;
}
// Ignore selection if it is not visible.
RefPtr<nsFrameSelection> frameSelection = FrameSelection();
if (!frameSelection || frameSelection->GetDisplaySelection() <=
nsISelectionController::SELECTION_HIDDEN) {
return;
}
dom::Selection* domSel = frameSelection->GetSelection(aSelectionType);
if (!domSel) return;
nsINode* startNode = GetNode();
RefPtr<EditorBase> editorBase = GetEditor();
if (editorBase) {
startNode = editorBase->GetRoot();
}
if (!startNode) return;
uint32_t childCount = startNode->GetChildCount();
nsresult rv = domSel->GetDynamicRangesForIntervalArray(
startNode, 0, startNode, childCount, true, aRanges);
NS_ENSURE_SUCCESS_VOID(rv);
// Remove collapsed ranges
aRanges->RemoveElementsBy(
[](const auto& range) { return range->Collapsed(); });
}
int32_t HyperTextAccessible::SelectionCount() {
nsTArray<nsRange*> ranges;
GetSelectionDOMRanges(SelectionType::eNormal, &ranges);
return ranges.Length();
}
bool HyperTextAccessible::SelectionBoundsAt(int32_t aSelectionNum,
int32_t* aStartOffset,
int32_t* aEndOffset) {
*aStartOffset = *aEndOffset = 0;
nsTArray<nsRange*> ranges;
GetSelectionDOMRanges(SelectionType::eNormal, &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->GetStartContainer();
nsINode* endNode = range->GetEndContainer();
uint32_t startOffset = range->StartOffset();
uint32_t endOffset = range->EndOffset();
// Make sure start is before end, by swapping DOM points. This occurs when
// the user selects backwards in the text.
const Maybe<int32_t> order =
nsContentUtils::ComparePoints(endNode, endOffset, startNode, startOffset);
if (!order) {
MOZ_ASSERT_UNREACHABLE();
return false;
}
if (*order < 0) {
std::swap(startNode, endNode);
std::swap(startOffset, endOffset);
}
if (!startNode->IsInclusiveDescendantOf(mContent)) {
*aStartOffset = 0;
} else {
*aStartOffset =
DOMPointToOffset(startNode, AssertedCast<int32_t>(startOffset));
}
if (!endNode->IsInclusiveDescendantOf(mContent)) {
*aEndOffset = CharacterCount();
} else {
*aEndOffset =
DOMPointToOffset(endNode, AssertedCast<int32_t>(endOffset), true);
}
return true;
}
bool HyperTextAccessible::RemoveFromSelection(int32_t aSelectionNum) {
RefPtr<dom::Selection> domSel = DOMSelection();
if (!domSel) return false;
if (aSelectionNum < 0 ||
aSelectionNum >= static_cast<int32_t>(domSel->RangeCount())) {
return false;
}
const RefPtr<nsRange> range{
domSel->GetRangeAt(static_cast<uint32_t>(aSelectionNum))};
domSel->RemoveRangeAndUnselectFramesAndNotifyListeners(*range,
IgnoreErrors());
return true;
}
void HyperTextAccessible::ScrollSubstringToPoint(int32_t aStartOffset,
int32_t aEndOffset,
uint32_t aCoordinateType,
int32_t aX, int32_t aY) {
nsIFrame* frame = GetFrame();
if (!frame) return;
LayoutDeviceIntPoint coords =
nsAccUtils::ConvertToScreenCoords(aX, aY, aCoordinateType, this);
RefPtr<nsRange> domRange = nsRange::Create(mContent);
TextRange range(this, this, aStartOffset, this, aEndOffset);
if (!range.AssignDOMRange(domRange)) {
return;
}
nsPresContext* presContext = frame->PresContext();
nsPoint coordsInAppUnits = LayoutDeviceIntPoint::ToAppUnits(
coords, 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, domRange,
ScrollAxis(WhereToScroll(vPercent), WhenToScroll::Always),
ScrollAxis(WhereToScroll(hPercent), WhenToScroll::Always));
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::SelectionRanges(
nsTArray<a11y::TextRange>* aRanges) const {
dom::Selection* sel = DOMSelection();
if (!sel) {
return;
}
TextRange::TextRangesFromSelection(sel, aRanges);
}
void HyperTextAccessible::ReplaceText(const nsAString& aText) {
if (aText.Length() == 0) {
DeleteText(0, CharacterCount());
return;
}
SetSelectionRange(0, CharacterCount());
RefPtr<EditorBase> editorBase = GetEditor();
if (!editorBase) {
return;
}
DebugOnly<nsresult> rv = editorBase->InsertTextAsAction(aText);
NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "Failed to insert the new text");
}
void HyperTextAccessible::InsertText(const nsAString& aText,
int32_t aPosition) {
RefPtr<EditorBase> editorBase = GetEditor();
if (editorBase) {
SetSelectionRange(aPosition, aPosition);
DebugOnly<nsresult> rv = editorBase->InsertTextAsAction(aText);
NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "Failed to insert the text");
}
}
void HyperTextAccessible::CopyText(int32_t aStartPos, int32_t aEndPos) {
RefPtr<EditorBase> editorBase = GetEditor();
if (editorBase) {
SetSelectionRange(aStartPos, aEndPos);
editorBase->Copy();
}
}
void HyperTextAccessible::CutText(int32_t aStartPos, int32_t aEndPos) {
RefPtr<EditorBase> editorBase = GetEditor();
if (editorBase) {
SetSelectionRange(aStartPos, aEndPos);
editorBase->Cut();
}
}
void HyperTextAccessible::DeleteText(int32_t aStartPos, int32_t aEndPos) {
RefPtr<EditorBase> editorBase = GetEditor();
if (!editorBase) {
return;
}
SetSelectionRange(aStartPos, aEndPos);
DebugOnly<nsresult> rv =
editorBase->DeleteSelectionAsAction(nsIEditor::eNone, nsIEditor::eStrip);
NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "Failed to delete text");
}
void HyperTextAccessible::PasteText(int32_t aPosition) {
RefPtr<EditorBase> editorBase = GetEditor();
if (editorBase) {
SetSelectionRange(aPosition, aPosition);
editorBase->PasteAsAction(nsIClipboard::kGlobalClipboard,
EditorBase::DispatchPasteEvent::Yes);
}
}
////////////////////////////////////////////////////////////////////////////////
// LocalAccessible public
// LocalAccessible protected
ENameValueFlag HyperTextAccessible::NativeName(nsString& aName) const {
// Check @alt attribute for invalid img elements.
if (mContent->IsHTMLElement(nsGkAtoms::img)) {
mContent->AsElement()->GetAttr(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->AsElement()->GetAttr(
kNameSpaceID_None, nsGkAtoms::title, aName)) {
aName.CompressWhitespace();
}
return eNameOK;
}
void HyperTextAccessible::Shutdown() {
mOffsets.Clear();
AccessibleWrap::Shutdown();
}
bool HyperTextAccessible::RemoveChild(LocalAccessible* aAccessible) {
const int32_t childIndex = aAccessible->IndexInParent();
if (childIndex < static_cast<int32_t>(mOffsets.Length())) {
mOffsets.RemoveLastElements(mOffsets.Length() - childIndex);
}
return AccessibleWrap::RemoveChild(aAccessible);
}
bool HyperTextAccessible::InsertChildAt(uint32_t aIndex,
LocalAccessible* aChild) {
if (aIndex < mOffsets.Length()) {
mOffsets.RemoveLastElements(mOffsets.Length() - aIndex);
}
return AccessibleWrap::InsertChildAt(aIndex, aChild);
}
Relation HyperTextAccessible::RelationByType(RelationType aType) const {
Relation rel = LocalAccessible::RelationByType(aType);
switch (aType) {
case RelationType::NODE_CHILD_OF:
if (HasOwnContent() && mContent->IsMathMLElement()) {
LocalAccessible* parent = LocalParent();
if (parent) {
nsIContent* parentContent = parent->GetContent();
if (parentContent &&
parentContent->IsMathMLElement(nsGkAtoms::mroot_)) {
// Add a relation pointing to the parent <mroot>.
rel.AppendTarget(parent);
}
}
}
break;
case RelationType::NODE_PARENT_OF:
if (HasOwnContent() && mContent->IsMathMLElement(nsGkAtoms::mroot_)) {
LocalAccessible* base = LocalChildAt(0);
LocalAccessible* index = LocalChildAt(1);
if (base && index) {
// Append the <mroot> children in the order index, base.
rel.AppendTarget(index);
rel.AppendTarget(base);
}
}
break;
default:
break;
}
return rel;
}
////////////////////////////////////////////////////////////////////////////////
// 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->IsTextFrame(), "Need text frame for offset conversion");
NS_ASSERTION(aFrame->GetPrevContinuation() == nullptr,
"Call on primary frame only");
nsIFrame::RenderedText text =
aFrame->GetRenderedText(aContentOffset, aContentOffset + 1,
nsIFrame::TextOffsetType::OffsetsInContentText,
nsIFrame::TrailingWhitespace::DontTrim);
*aRenderedOffset = text.mOffsetWithinNodeRenderedText;
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->IsTextFrame(), "Need text frame for offset conversion");
NS_ASSERTION(aFrame->GetPrevContinuation() == nullptr,
"Call on primary frame only");
nsIFrame::RenderedText text =
aFrame->GetRenderedText(aRenderedOffset, aRenderedOffset + 1,
nsIFrame::TextOffsetType::OffsetsInRenderedText,
nsIFrame::TrailingWhitespace::DontTrim);
*aContentOffset = text.mOffsetWithinNodeText;
return NS_OK;
}
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