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); } LayoutDeviceIntRect HyperTextAccessible::GetBoundsInFrame( nsIFrame* aFrame, uint32_t aStartRenderedOffset, uint32_t aEndRenderedOffset) { nsPresContext* presContext = mDoc->PresContext(); if (!aFrame->IsTextFrame()) { return LayoutDeviceIntRect::FromAppUnitsToNearest( aFrame->GetScreenRectInAppUnits(), 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, LayoutDeviceIntRect()); rv = RenderedToContentOffset(aFrame, aEndRenderedOffset, &endContentOffset); NS_ENSURE_SUCCESS(rv, LayoutDeviceIntRect()); 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, LayoutDeviceIntRect()); 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 auto [startFrameTextOffset, endFrameTextOffset] = frame->GetOffsets(); 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, LayoutDeviceIntRect()); // Use the point for the end offset to calculate the width nsPoint frameTextEndPoint; rv = frame->GetPointFromOffset(startContentOffset + frameSubStringLength, &frameTextEndPoint); NS_ENSURE_SUCCESS(rv, LayoutDeviceIntRect()); frameScreenRect.SetRectX( frameScreenRect.X() + std::min(frameTextStartPoint.x, frameTextEndPoint.x), 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 LayoutDeviceIntRect::FromAppUnitsToNearest( screenRect, presContext->AppUnitsPerDevPixel()); } 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(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
is the hacky "padding
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.

abc

def

ghi

. 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 = 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(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(); } 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; LocalAccessible* 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->LocalChildAt(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->IsTextFrame(), "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, nsPeekOffsetStruct::ForceEditableRegion::No, aWordMovementType, false); nsresult rv = frameAtOffset->PeekOffset(&pos); // PeekOffset fails on last/first lines of the text in certain cases. bool fallBackToSelectEndLine = false; if (NS_FAILED(rv) && aAmount == eSelectLine) { fallBackToSelectEndLine = aDirection == eDirNext; pos.mAmount = fallBackToSelectEndLine ? 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 (fallBackToSelectEndLine && IsLineEndCharAt(hyperTextOffset)) { // We used eSelectEndLine, but the caller requested eSelectLine. // If there's a '\n' at the end of the line, eSelectEndLine will stop on // it rather than after it. This is not what we want, since the caller // wants the next line, not the same line. ++hyperTextOffset; } 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) { LocalAccessible* prevOffsetChild = GetChildAtOffset(hyperTextOffset - 1); if (prevOffsetChild == AsHTMLListItem()->Bullet()) return 0; } } return hyperTextOffset; } uint32_t HyperTextAccessible::FindWordBoundary( uint32_t aOffset, nsDirection aDirection, EWordMovementType aWordMovementType) { uint32_t orig = FindOffset(aOffset, aDirection, eSelectWord, aWordMovementType); if (aWordMovementType != eStartWord) { return orig; } if (aDirection == eDirPrevious) { // When layout.word_select.stop_at_punctuation is true (the default), // for a word beginning with punctuation, layout treats the punctuation // as the start of the word when moving next. However, when moving // previous, layout stops *after* the punctuation. We want to be // consistent regardless of movement direction and always treat punctuation // as the start of a word. if (!StaticPrefs::layout_word_select_stop_at_punctuation()) { return orig; } // Case 1: Example: "a @" // If aOffset is 2 or 3, orig will be 0, but it should be 2. That is, // previous word moved back too far. LocalAccessible* child = GetChildAtOffset(orig); if (child && child->IsHyperText()) { // For a multi-word embedded object, previous word correctly goes back // to the start of the word (the embedded object). Next word (below) // incorrectly stops after the embedded object in this case, so return // the already correct result. // Example: "a x y b", where "x y" is an embedded link // If aOffset is 4, orig will be 2, which is correct. // If we get the next word (below), we'll end up returning 3 instead. return orig; } uint32_t next = FindOffset(orig, eDirNext, eSelectWord, eStartWord); if (next < aOffset) { // Next word stopped on punctuation. return next; } // case 2: example: "a @@b" // If aOffset is 2, 3 or 4, orig will be 4, but it should be 2. That is, // previous word didn't go back far enough. if (orig == 0) { return orig; } // Walk backwards by offset, getting the next word. // In the loop, o is unsigned, so o >= 0 will always be true and won't // prevent us from decrementing at 0. Instead, we check that o doesn't // wrap around. for (uint32_t o = orig - 1; o < orig; --o) { next = FindOffset(o, eDirNext, eSelectWord, eStartWord); if (next == orig) { // Next word and previous word were consistent. This // punctuation problem isn't applicable here. break; } if (next < orig) { // Next word stopped on punctuation. return next; } } } else { // When layout.word_select.stop_at_punctuation is true (the default), // when positioned on punctuation in the middle of a word, next word skips // the rest of the word. However, when positioned before the punctuation, // next word moves just after the punctuation. We want to be consistent // regardless of starting position and always stop just after the // punctuation. // Next word can move too far when positioned on white space too. // Example: "a b@c" // If aOffset is 3, orig will be 5, but it should be 4. That is, next word // moved too far. if (aOffset == 0) { return orig; } uint32_t prev = FindOffset(orig, eDirPrevious, eSelectWord, eStartWord); if (prev <= aOffset) { // orig definitely isn't too far forward. return orig; } // Walk backwards by offset, getting the next word. // In the loop, o is unsigned, so o >= 0 will always be true and won't // prevent us from decrementing at 0. Instead, we check that o doesn't // wrap around. for (uint32_t o = aOffset - 1; o < aOffset; --o) { uint32_t next = FindOffset(o, eDirNext, eSelectWord, eStartWord); if (next > aOffset && next < orig) { return next; } if (next <= aOffset) { break; } } } return orig; } 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). uint32_t thisLineBeginOffset = FindOffset(aOffset, eDirPrevious, eSelectBeginLine); if (IsCharAt(thisLineBeginOffset, kEmbeddedObjectChar)) { // We landed on an embedded character, don't mess with possible embedded // line breaks, and assume the offset is correct. return thisLineBeginOffset; } // Sometimes, there is the possibility layout returned an // offset smaller than it should. Sanity-check by moving to the end of the // previous line and see if that has a greater offset. uint32_t tmpOffset = FindOffset(aOffset, eDirPrevious, eSelectLine); tmpOffset = FindOffset(tmpOffset, eDirNext, eSelectEndLine); if (tmpOffset > thisLineBeginOffset && tmpOffset < aOffset) { // We found a previous line offset. Return the next character after it // as our start offset if it points to a line end char. return IsLineEndCharAt(tmpOffset) ? tmpOffset + 1 : tmpOffset; } return thisLineBeginOffset; } 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); uint32_t characterCount = CharacterCount(); if (tmpOffset == characterCount) { return tmpOffset; } // Now, simulate the Home key on the next line to get its real offset. uint32_t nextLineBeginOffset = FindOffset(tmpOffset, eDirPrevious, eSelectBeginLine); // Sometimes, there are line breaks inside embedded characters. If this // is the case, the cursor is after the line break, but the offset will // be that of the embedded character, which points to before the line // break. We definitely want the line break included. if (IsCharAt(nextLineBeginOffset, kEmbeddedObjectChar)) { // We can determine if there is a line break by pressing End from // the queried offset. If there is a line break, the offset will be 1 // greater, since this line ends with the embed. If there is not, the // value will be different even if a line break follows right after the // embed. uint32_t thisLineEndOffset = FindOffset(aOffset, eDirNext, eSelectEndLine); if (thisLineEndOffset == nextLineBeginOffset + 1) { // If we're querying the offset of the embedded character, we want // the end offset of the parent line instead. Press End // once more from the current position, which is after the embed. if (nextLineBeginOffset == aOffset) { uint32_t thisLineEndOffset2 = FindOffset(thisLineEndOffset, eDirNext, eSelectEndLine); // The above returns an offset exclusive the final line break, so we // need to add 1 to it to return an inclusive end offset. Make sure // we don't overshoot if we've started from another embedded // character that has a line break, or landed on another embedded // character, or if the result is the very end. return (thisLineEndOffset2 == characterCount || (IsCharAt(thisLineEndOffset, kEmbeddedObjectChar) && thisLineEndOffset2 == thisLineEndOffset + 1) || IsCharAt(thisLineEndOffset2, kEmbeddedObjectChar)) ? thisLineEndOffset2 : thisLineEndOffset2 + 1; } return thisLineEndOffset; } return nextLineBeginOffset; } // If the resulting offset is not greater than the offset we started from, // layout could not find the offset for us. This can happen with certain // inline-block elements. if (nextLineBeginOffset <= aOffset) { // Walk forward from the offset we started from up to tmpOffset, // stopping after a line end character. nextLineBeginOffset = aOffset; while (nextLineBeginOffset < tmpOffset) { if (IsLineEndCharAt(nextLineBeginOffset)) { return nextLineBeginOffset + 1; } nextLineBeginOffset++; } } return nextLineBeginOffset; } 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; } int32_t HyperTextAccessible::FindParagraphStartOffset(uint32_t aOffset) { // Because layout often gives us offsets that are incompatible with // accessibility API requirements, for example when a paragraph contains // presentational line breaks as found in Google Docs, use the accessibility // tree to find the start offset instead. LocalAccessible* child = GetChildAtOffset(aOffset); if (!child) { return -1; // Invalid offset } // Use the pivot class to search for the start offset. Pivot p = Pivot(this); ParagraphBoundaryRule boundaryRule = ParagraphBoundaryRule( child, child->IsTextLeaf() ? aOffset - GetChildOffset(child) : 0, eDirPrevious); Accessible* match = p.Prev(child, boundaryRule, true); if (!match || match->AsLocal() == this) { // Found nothing, or pivot found the root of the search, startOffset is 0. // This will include all relevant text nodes. return 0; } if (match == child) { // We started out on a boundary. if (match->Role() == roles::WHITESPACE) { // We are on a line break boundary, so force pivot to find the previous // boundary. What we want is any text before this, if any. match = p.Prev(match, boundaryRule); if (!match || match->AsLocal() == this) { // Same as before, we landed on the root, so offset is definitely 0. return 0; } } else if (!match->AsLocal()->IsTextLeaf()) { // The match is a block element, which is always a starting point, so // just return its offset. return TransformOffset(match->AsLocal(), 0, false); } } if (match->AsLocal()->IsTextLeaf()) { // ParagraphBoundaryRule only returns a text leaf if it contains a line // break. We want to stop after that. return TransformOffset(match->AsLocal(), boundaryRule.GetLastMatchTextOffset() + 1, false); } // This is a previous boundary, we don't want to include it itself. // So, walk forward one accessible, excluding the descendants of this // boundary if it is a block element. The below call to Next should always be // initialized with a boundary. SkipParagraphBoundaryRule goForwardOneRule = SkipParagraphBoundaryRule(match); match = p.Next(match, goForwardOneRule); // We already know that the search skipped over at least one accessible, // so match can't be null. Get its transformed offset. MOZ_ASSERT(match); return TransformOffset(match->AsLocal(), 0, false); } int32_t HyperTextAccessible::FindParagraphEndOffset(uint32_t aOffset) { // Because layout often gives us offsets that are incompatible with // accessibility API requirements, for example when a paragraph contains // presentational line breaks as found in Google Docs, use the accessibility // tree to find the end offset instead. LocalAccessible* child = GetChildAtOffset(aOffset); if (!child) { return -1; // invalid offset } // Use the pivot class to search for the end offset. Pivot p = Pivot(this); ParagraphBoundaryRule boundaryRule = ParagraphBoundaryRule( child, child->IsTextLeaf() ? aOffset - GetChildOffset(child) : 0, eDirNext, // In order to encompass all paragraphs inside embedded objects, not just // the first, we want to skip the anchor's subtree. /* aSkipAnchorSubtree */ true); // Search forward for the end offset, including child. We don't want // to go beyond this point if this offset indicates a paragraph boundary. Accessible* match = p.Next(child, boundaryRule, true); if (match) { // Found something of relevance, adjust end offset. LocalAccessible* matchAcc = match->AsLocal(); uint32_t matchOffset; if (matchAcc->IsTextLeaf()) { // ParagraphBoundaryRule only returns a text leaf if it contains a line // break. matchOffset = boundaryRule.GetLastMatchTextOffset() + 1; } else if (matchAcc->Role() != roles::WHITESPACE && matchAcc != child) { // We found a block boundary that wasn't our origin. We want to stop // right on it, not after it, since we don't want to include the content // of the block. matchOffset = 0; } else { matchOffset = nsAccUtils::TextLength(matchAcc); } return TransformOffset(matchAcc, matchOffset, true); } // Didn't find anything, end offset is character count. return CharacterCount(); } void HyperTextAccessible::TextBeforeOffset(int32_t aOffset, AccessibleTextBoundary aBoundaryType, int32_t* aStartOffset, int32_t* aEndOffset, nsAString& aText) { if (StaticPrefs::accessibility_cache_enabled_AtStartup()) { // This isn't strictly related to caching, but this new text implementation // is being developed to make caching feasible. We put it behind this pref // to make it easy to test while it's still under development. return HyperTextAccessibleBase::TextBeforeOffset( aOffset, aBoundaryType, aStartOffset, aEndOffset, aText); } *aStartOffset = *aEndOffset = 0; aText.Truncate(); if (aBoundaryType == nsIAccessibleText::BOUNDARY_PARAGRAPH) { // Not supported, bail out with empty text. return; } 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(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) { if (StaticPrefs::accessibility_cache_enabled_AtStartup()) { // This isn't strictly related to caching, but this new text implementation // is being developed to make caching feasible. We put it behind this pref // to make it easy to test while it's still under development. return HyperTextAccessibleBase::TextAtOffset( aOffset, aBoundaryType, aStartOffset, aEndOffset, aText); } *aStartOffset = *aEndOffset = 0; aText.Truncate(); uint32_t adjustedOffset = ConvertMagicOffset(aOffset); if (adjustedOffset == std::numeric_limits::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; case nsIAccessibleText::BOUNDARY_PARAGRAPH: { if (aOffset == nsIAccessibleText::TEXT_OFFSET_CARET) { adjustedOffset = AdjustCaretOffset(adjustedOffset); } if (IsEmptyLastLineOffset(adjustedOffset)) { // We are on the last line of a paragraph where there is no text. // For example, in a textarea where a new line has just been inserted. // In this case, return offsets for an empty line without text content. *aStartOffset = *aEndOffset = adjustedOffset; break; } *aStartOffset = FindParagraphStartOffset(adjustedOffset); *aEndOffset = FindParagraphEndOffset(adjustedOffset); TextSubstring(*aStartOffset, *aEndOffset, aText); break; } } } void HyperTextAccessible::TextAfterOffset(int32_t aOffset, AccessibleTextBoundary aBoundaryType, int32_t* aStartOffset, int32_t* aEndOffset, nsAString& aText) { if (StaticPrefs::accessibility_cache_enabled_AtStartup()) { // This isn't strictly related to caching, but this new text implementation // is being developed to make caching feasible. We put it behind this pref // to make it easy to test while it's still under development. return HyperTextAccessibleBase::TextAfterOffset( aOffset, aBoundaryType, aStartOffset, aEndOffset, aText); } *aStartOffset = *aEndOffset = 0; aText.Truncate(); if (aBoundaryType == nsIAccessibleText::BOUNDARY_PARAGRAPH) { // Not supported, bail out with empty text. return; } 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(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 HyperTextAccessible::TextAttributes( bool aIncludeDefAttrs, int32_t aOffset, int32_t* aStartOffset, int32_t* aEndOffset) { if (StaticPrefs::accessibility_cache_enabled_AtStartup()) { // This isn't strictly related to caching, but this new text implementation // is being developed to make caching feasible. We put it behind this pref // to make it easy to test while it's still under development. return HyperTextAccessibleBase::TextAttributes(aIncludeDefAttrs, aOffset, aStartOffset, 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. RefPtr attributes = new AccAttributes(); *aStartOffset = *aEndOffset = 0; index_t offset = ConvertMagicOffset(aOffset); if (!offset.IsValid() || offset > CharacterCount()) { NS_ERROR("Wrong in offset!"); return attributes.forget(); } LocalAccessible* 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(); } 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->IsTextFrame()) { int32_t nodeOffset = 0; RenderedToContentOffset(offsetFrame, offsetInAcc, &nodeOffset); // Set 'misspelled' text attribute. // FYI: Max length of text in a text node is less than INT32_MAX (see // NS_MAX_TEXT_FRAGMENT_LENGTH) so that nodeOffset should always // be 0 or greater. MOZ_DIAGNOSTIC_ASSERT(accAtOffset->GetNode()->IsText()); MOZ_DIAGNOSTIC_ASSERT(nodeOffset >= 0); GetSpellTextAttr(accAtOffset->GetNode(), static_cast(nodeOffset), &startOffset, &endOffset, attributes); } *aStartOffset = startOffset; *aEndOffset = endOffset; return attributes.forget(); } already_AddRefed HyperTextAccessible::DefaultTextAttributes() { RefPtr 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 (or an inferred ). // 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 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 HyperTextAccessible::NativeAttributes() { RefPtr 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 } LayoutDeviceIntRect 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 LayoutDeviceIntRect(); } if (CharacterCount() == 0) { nsPresContext* presContext = mDoc->PresContext(); // Empty content, use our own bound to at least get x,y coordinates nsIFrame* frame = GetFrame(); if (!frame) { return LayoutDeviceIntRect(); } return LayoutDeviceIntRect::FromAppUnitsToNearest( frame->GetScreenRectInAppUnits(), presContext->AppUnitsPerDevPixel()); } int32_t childIdx = GetChildIndexAtOffset(startOffset); if (childIdx == -1) return LayoutDeviceIntRect(); LayoutDeviceIntRect bounds; int32_t prevOffset = GetChildOffset(childIdx); int32_t offset1 = startOffset - prevOffset; while (childIdx < static_cast(ChildCount())) { nsIFrame* frame = LocalChildAt(childIdx++)->GetFrame(); if (!frame) { MOZ_ASSERT_UNREACHABLE("No frame for a child!"); continue; } int32_t nextOffset = GetChildOffset(childIdx); if (nextOffset >= static_cast(endOffset)) { bounds.UnionRect( bounds, GetBoundsInFrame(frame, offset1, endOffset - prevOffset)); break; } bounds.UnionRect(bounds, GetBoundsInFrame(frame, offset1, nextOffset - prevOffset)); prevOffset = nextOffset; offset1 = 0; } // This document may have a resolution set, we will need to multiply // the document-relative coordinates by that value and re-apply the doc's // screen coordinates. nsPresContext* presContext = mDoc->PresContext(); nsIFrame* rootFrame = presContext->PresShell()->GetRootFrame(); LayoutDeviceIntRect orgRectPixels = LayoutDeviceIntRect::FromAppUnitsToNearest( rootFrame->GetScreenRectInAppUnits(), presContext->AppUnitsPerDevPixel()); bounds.MoveBy(-orgRectPixels.X(), -orgRectPixels.Y()); bounds.ScaleRoundOut(presContext->PresShell()->GetResolution()); bounds.MoveBy(orgRectPixels.X(), orgRectPixels.Y()); auto boundsX = bounds.X(); auto boundsY = bounds.Y(); nsAccUtils::ConvertScreenCoordsTo(&boundsX, &boundsY, aCoordType, this); bounds.MoveTo(boundsX, boundsY); return bounds; } already_AddRefed 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 docShell = nsCoreUtils::GetDocShellFor(mContent); nsCOMPtr editingSession; docShell->GetEditingSession(getter_AddRefs(editingSession)); if (!editingSession) return nullptr; // No editing session interface dom::Document* docNode = mDoc->DocumentNode(); RefPtr 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 = 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 domSel = DOMSelection(); NS_ENSURE_STATE(domSel); // Set up the selection. for (const uint32_t idx : Reversed(IntegerRange(1u, domSel->RangeCount()))) { MOZ_ASSERT(domSel->RangeCount() == idx + 1); RefPtr range{domSel->GetRangeAt(idx)}; if (!range) { break; // The range count has been changed by somebody else. } domSel->RemoveRangeAndUnselectFramesAndNotifyListeners(*range, 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 window = docNode->GetWindow(); RefPtr 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 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; 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); 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 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(); nsPoint offset; // Offset from widget origin to the frame origin, which includes chrome // on the widget. *aWidget = frame->GetNearestWidget(offset); NS_ENSURE_TRUE(*aWidget, LayoutDeviceIntRect()); rect.MoveBy(offset); LayoutDeviceIntRect caretRect = LayoutDeviceIntRect::FromUnknownRect( rect.ToOutsidePixels(frame->PresContext()->AppUnitsPerDevPixel())); // clang-format off // ((content screen origin) - (content offset in the widget)) = widget origin on the screen // clang-format on caretRect.MoveBy((*aWidget)->WidgetToScreenOffset() - (*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. 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()); } return caretRect; } void HyperTextAccessible::GetSelectionDOMRanges(SelectionType aSelectionType, nsTArray* aRanges) { // Ignore selection if it is not visible. RefPtr frameSelection = FrameSelection(); if (!frameSelection || frameSelection->GetDisplaySelection() <= nsISelectionController::SELECTION_HIDDEN) { return; } dom::Selection* domSel = frameSelection->GetSelection(aSelectionType); if (!domSel) return; nsINode* startNode = GetNode(); RefPtr editorBase = GetEditor(); if (editorBase) { startNode = editorBase->GetRoot(); } 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 aRanges->RemoveElementsBy( [](const auto& range) { return range->Collapsed(); }); } int32_t HyperTextAccessible::SelectionCount() { nsTArray ranges; GetSelectionDOMRanges(SelectionType::eNormal, &ranges); return ranges.Length(); } bool HyperTextAccessible::SelectionBoundsAt(int32_t aSelectionNum, int32_t* aStartOffset, int32_t* aEndOffset) { *aStartOffset = *aEndOffset = 0; nsTArray ranges; GetSelectionDOMRanges(SelectionType::eNormal, &ranges); uint32_t rangeCount = ranges.Length(); if (aSelectionNum < 0 || aSelectionNum >= static_cast(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 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(startOffset)); } if (!endNode->IsInclusiveDescendantOf(mContent)) { *aEndOffset = CharacterCount(); } else { *aEndOffset = DOMPointToOffset(endNode, AssertedCast(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() || std::max(startOffset, endOffset) > CharacterCount()) { NS_ERROR("Wrong in offset"); return false; } TextRange range(this, this, startOffset, this, endOffset); return range.SetSelectionAt(aSelectionNum); } bool HyperTextAccessible::RemoveFromSelection(int32_t aSelectionNum) { RefPtr domSel = DOMSelection(); if (!domSel) return false; if (aSelectionNum < 0 || aSelectionNum >= static_cast(domSel->RangeCount())) { return false; } const RefPtr range{ domSel->GetRangeAt(static_cast(aSelectionNum))}; domSel->RemoveRangeAndUnselectFramesAndNotifyListeners(*range, IgnoreErrors()); return true; } void HyperTextAccessible::ScrollSubstringTo(int32_t aStartOffset, int32_t aEndOffset, uint32_t aScrollType) { TextRange range(this, this, aStartOffset, this, aEndOffset); range.ScrollIntoView(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; LayoutDeviceIntPoint coords = nsAccUtils::ConvertToScreenCoords(aX, aY, aCoordinateType, this); RefPtr 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::EnclosingRange(a11y::TextRange& aRange) const { if (IsTextField()) { aRange.Set(mDoc, const_cast(this), 0, const_cast(this), CharacterCount()); } else { aRange.Set(mDoc, mDoc, 0, mDoc, mDoc->CharacterCount()); } } void HyperTextAccessible::SelectionRanges( nsTArray* aRanges) const { dom::Selection* sel = DOMSelection(); if (!sel) { return; } TextRange::TextRangesFromSelection(sel, aRanges); } void HyperTextAccessible::VisibleRanges( nsTArray* aRanges) const {} void HyperTextAccessible::RangeByChild(LocalAccessible* aChild, a11y::TextRange& aRange) const { HyperTextAccessible* ht = aChild->AsHyperText(); if (ht) { aRange.Set(mDoc, ht, 0, ht, ht->CharacterCount()); return; } LocalAccessible* child = aChild; LocalAccessible* parent = nullptr; while ((parent = child->LocalParent()) && !(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 { LocalAccessible* child = mDoc->LocalChildAtPoint(aX, aY, EWhichChildAtPoint::DeepestChild); if (!child) return; LocalAccessible* parent = nullptr; while ((parent = child->LocalParent()) && !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); } } //////////////////////////////////////////////////////////////////////////////// // 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(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->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(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 . 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 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; } //////////////////////////////////////////////////////////////////////////////// // HyperTextAccessible protected nsresult HyperTextAccessible::GetDOMPointByFrameOffset( nsIFrame* aFrame, int32_t aOffset, LocalAccessible* 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->ComputeIndexOf_Deprecated(content) + 1; aPoint->node = parent; } else if (aFrame->IsTextFrame()) { 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->ComputeIndexOf_Deprecated(content); aPoint->node = parent; } return NS_OK; } // HyperTextAccessible void HyperTextAccessible::GetSpellTextAttr(nsINode* aNode, uint32_t aNodeOffset, uint32_t* aStartOffset, uint32_t* aEndOffset, AccAttributes* aAttributes) { RefPtr fs = FrameSelection(); if (!fs) return; dom::Selection* domSel = fs->GetSelection(SelectionType::eSpellCheck); if (!domSel) return; const uint32_t rangeCount = domSel->RangeCount(); if (!rangeCount) { return; } uint32_t startOffset = 0, endOffset = 0; for (const uint32_t idx : IntegerRange(rangeCount)) { MOZ_ASSERT(domSel->RangeCount() == rangeCount); const nsRange* range = domSel->GetRangeAt(idx); MOZ_ASSERT(range); 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->GetEndContainer(); uint32_t endNodeOffset = range->EndOffset(); Maybe order = nsContentUtils::ComparePoints( aNode, aNodeOffset, endNode, endNodeOffset); if (NS_WARN_IF(!order)) { continue; } if (*order >= 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->GetStartContainer(); int32_t startNodeOffset = range->StartOffset(); order = nsContentUtils::ComparePoints(startNode, startNodeOffset, aNode, aNodeOffset); if (!order) { // As (`aNode`, `aNodeOffset`) is comparable to the end of the range, it // should also be comparable to the range's start. Returning here // prevents crashes in release builds. MOZ_ASSERT_UNREACHABLE(); return; } if (*order <= 0) { startOffset = DOMPointToOffset(startNode, startNodeOffset); endOffset = DOMPointToOffset(endNode, endNodeOffset); if (startOffset > *aStartOffset) *aStartOffset = startOffset; if (endOffset < *aEndOffset) *aEndOffset = endOffset; aAttributes->SetAttribute(nsGkAtoms::invalid, nsGkAtoms::spelling); return; } // This range came after the point. endOffset = DOMPointToOffset(startNode, startNodeOffset); if (idx > 0) { const nsRange* prevRange = domSel->GetRangeAt(idx - 1); startOffset = DOMPointToOffset(prevRange->GetEndContainer(), prevRange->EndOffset()); } // The previous range might not be within this accessible. In that case, // DOMPointToOffset returns length as a fallback. We don't want to use // that offset if so, hence the startOffset < *aEndOffset check. if (startOffset > *aStartOffset && startOffset < *aEndOffset) { *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. const nsRange* prevRange = domSel->GetRangeAt(rangeCount - 1); startOffset = DOMPointToOffset(prevRange->GetEndContainer(), prevRange->EndOffset()); // The previous range might not be within this accessible. In that case, // DOMPointToOffset returns length as a fallback. We don't want to use // that offset if so, hence the startOffset < *aEndOffset check. if (startOffset > *aStartOffset && startOffset < *aEndOffset) { *aStartOffset = startOffset; } }