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Diffstat (limited to '')
| -rw-r--r-- | accessible/mac/GeckoTextMarker.mm | 537 |
1 files changed, 537 insertions, 0 deletions
diff --git a/accessible/mac/GeckoTextMarker.mm b/accessible/mac/GeckoTextMarker.mm new file mode 100644 index 0000000000..fe538ccdb7 --- /dev/null +++ b/accessible/mac/GeckoTextMarker.mm @@ -0,0 +1,537 @@ +/* clang-format off */ +/* -*- Mode: Objective-C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* clang-format on */ +/* 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/. */ + +#import "GeckoTextMarker.h" + +#import "MacUtils.h" + +#include "AccAttributes.h" +#include "DocAccessible.h" +#include "DocAccessibleParent.h" +#include "nsCocoaUtils.h" +#include "HyperTextAccessible.h" +#include "States.h" +#include "nsAccUtils.h" + +namespace mozilla { +namespace a11y { + +struct TextMarkerData { + TextMarkerData(uintptr_t aDoc, uintptr_t aID, int32_t aOffset) + : mDoc(aDoc), mID(aID), mOffset(aOffset) {} + TextMarkerData() {} + uintptr_t mDoc; + uintptr_t mID; + int32_t mOffset; +}; + +// GeckoTextMarker + +GeckoTextMarker::GeckoTextMarker(Accessible* aAcc, int32_t aOffset) { + HyperTextAccessibleBase* ht = aAcc->AsHyperTextBase(); + if (ht && aOffset != nsIAccessibleText::TEXT_OFFSET_END_OF_TEXT && + aOffset <= static_cast<int32_t>(ht->CharacterCount())) { + mPoint = aAcc->AsHyperTextBase()->ToTextLeafPoint(aOffset); + } else { + mPoint = TextLeafPoint(aAcc, aOffset); + } +} + +GeckoTextMarker GeckoTextMarker::MarkerFromAXTextMarker( + Accessible* aDoc, AXTextMarkerRef aTextMarker) { + MOZ_ASSERT(aDoc); + if (!aTextMarker) { + return GeckoTextMarker(); + } + + if (AXTextMarkerGetLength(aTextMarker) != sizeof(TextMarkerData)) { + MOZ_ASSERT_UNREACHABLE("Malformed AXTextMarkerRef"); + return GeckoTextMarker(); + } + + TextMarkerData markerData; + memcpy(&markerData, AXTextMarkerGetBytePtr(aTextMarker), + sizeof(TextMarkerData)); + + if (!utils::DocumentExists(aDoc, markerData.mDoc)) { + return GeckoTextMarker(); + } + + Accessible* doc = reinterpret_cast<Accessible*>(markerData.mDoc); + MOZ_ASSERT(doc->IsDoc()); + int32_t offset = markerData.mOffset; + Accessible* acc = nullptr; + if (doc->IsRemote()) { + acc = doc->AsRemote()->AsDoc()->GetAccessible(markerData.mID); + } else { + acc = doc->AsLocal()->AsDoc()->GetAccessibleByUniqueID( + reinterpret_cast<void*>(markerData.mID)); + } + + if (!acc) { + return GeckoTextMarker(); + } + + return GeckoTextMarker(acc, offset); +} + +GeckoTextMarker GeckoTextMarker::MarkerFromIndex(Accessible* aRoot, + int32_t aIndex) { + TextLeafRange range( + TextLeafPoint(aRoot, 0), + TextLeafPoint(aRoot, nsIAccessibleText::TEXT_OFFSET_END_OF_TEXT)); + int32_t index = aIndex; + // Iterate through all segments until we exhausted the index sum + // so we can find the segment the index lives in. + for (TextLeafRange segment : range) { + if (segment.End().mAcc->Role() == roles::LISTITEM_MARKER) { + // XXX: MacOS expects bullets to be in the range's text, but not in + // the calculated length! + continue; + } + + index -= segment.End().mOffset - segment.Start().mOffset; + if (index <= 0) { + // The index is in the current segment. + return GeckoTextMarker(segment.Start().mAcc, + segment.End().mOffset + index); + } + } + + return GeckoTextMarker(); +} + +AXTextMarkerRef GeckoTextMarker::CreateAXTextMarker() { + if (!IsValid()) { + return nil; + } + + Accessible* doc = nsAccUtils::DocumentFor(mPoint.mAcc); + TextMarkerData markerData(reinterpret_cast<uintptr_t>(doc), mPoint.mAcc->ID(), + mPoint.mOffset); + AXTextMarkerRef cf_text_marker = AXTextMarkerCreate( + kCFAllocatorDefault, reinterpret_cast<const UInt8*>(&markerData), + sizeof(TextMarkerData)); + + return (__bridge AXTextMarkerRef)[(__bridge id)(cf_text_marker)autorelease]; +} + +bool GeckoTextMarker::Next() { + TextLeafPoint next = + mPoint.FindBoundary(nsIAccessibleText::BOUNDARY_CHAR, eDirNext, + TextLeafPoint::BoundaryFlags::eIgnoreListItemMarker); + + if (next && next != mPoint) { + mPoint = next; + return true; + } + + return false; +} + +bool GeckoTextMarker::Previous() { + TextLeafPoint prev = + mPoint.FindBoundary(nsIAccessibleText::BOUNDARY_CHAR, eDirPrevious, + TextLeafPoint::BoundaryFlags::eIgnoreListItemMarker); + if (prev && mPoint != prev) { + mPoint = prev; + return true; + } + + return false; +} + +/** + * Return true if the given point is inside editable content. + */ +static bool IsPointInEditable(const TextLeafPoint& aPoint) { + if (aPoint.mAcc) { + if (aPoint.mAcc->State() & states::EDITABLE) { + return true; + } + + Accessible* parent = aPoint.mAcc->Parent(); + if (parent && (parent->State() & states::EDITABLE)) { + return true; + } + } + + return false; +} + +GeckoTextMarkerRange GeckoTextMarker::LeftWordRange() const { + bool includeCurrentInStart = !mPoint.IsParagraphStart(true); + if (includeCurrentInStart) { + TextLeafPoint prevChar = + mPoint.FindBoundary(nsIAccessibleText::BOUNDARY_CHAR, eDirPrevious); + if (!prevChar.IsSpace()) { + includeCurrentInStart = false; + } + } + + TextLeafPoint start = mPoint.FindBoundary( + nsIAccessibleText::BOUNDARY_WORD_START, eDirPrevious, + includeCurrentInStart + ? (TextLeafPoint::BoundaryFlags::eIncludeOrigin | + TextLeafPoint::BoundaryFlags::eStopInEditable | + TextLeafPoint::BoundaryFlags::eIgnoreListItemMarker) + : (TextLeafPoint::BoundaryFlags::eStopInEditable | + TextLeafPoint::BoundaryFlags::eIgnoreListItemMarker)); + + TextLeafPoint end; + if (start == mPoint) { + end = start.FindBoundary(nsIAccessibleText::BOUNDARY_WORD_END, eDirPrevious, + TextLeafPoint::BoundaryFlags::eStopInEditable); + } + + if (start != mPoint || end == start) { + end = start.FindBoundary(nsIAccessibleText::BOUNDARY_WORD_END, eDirNext, + TextLeafPoint::BoundaryFlags::eStopInEditable); + if (end < mPoint && IsPointInEditable(end) && !IsPointInEditable(mPoint)) { + start = end; + end = mPoint; + } + } + + return GeckoTextMarkerRange(start < end ? start : end, + start < end ? end : start); +} + +GeckoTextMarkerRange GeckoTextMarker::RightWordRange() const { + TextLeafPoint prevChar = + mPoint.FindBoundary(nsIAccessibleText::BOUNDARY_CHAR, eDirPrevious, + TextLeafPoint::BoundaryFlags::eStopInEditable); + + if (prevChar != mPoint && mPoint.IsParagraphStart(true)) { + return GeckoTextMarkerRange(mPoint, mPoint); + } + + TextLeafPoint end = + mPoint.FindBoundary(nsIAccessibleText::BOUNDARY_WORD_END, eDirNext, + TextLeafPoint::BoundaryFlags::eStopInEditable); + + if (end == mPoint) { + // No word to the right of this point. + return GeckoTextMarkerRange(mPoint, mPoint); + } + + TextLeafPoint start = + end.FindBoundary(nsIAccessibleText::BOUNDARY_WORD_START, eDirPrevious, + TextLeafPoint::BoundaryFlags::eStopInEditable); + + if (start.FindBoundary(nsIAccessibleText::BOUNDARY_WORD_END, eDirNext, + TextLeafPoint::BoundaryFlags::eStopInEditable) < + mPoint) { + // Word end is inside of an input to the left of this. + return GeckoTextMarkerRange(mPoint, mPoint); + } + + if (mPoint < start) { + end = start; + start = mPoint; + } + + return GeckoTextMarkerRange(start < end ? start : end, + start < end ? end : start); +} + +GeckoTextMarkerRange GeckoTextMarker::LineRange() const { + TextLeafPoint start = mPoint.FindBoundary( + nsIAccessibleText::BOUNDARY_LINE_START, eDirPrevious, + TextLeafPoint::BoundaryFlags::eStopInEditable | + TextLeafPoint::BoundaryFlags::eIgnoreListItemMarker | + TextLeafPoint::BoundaryFlags::eIncludeOrigin); + // If this is a blank line containing only a line feed, the start boundary + // is the same as the end boundary. We do not want to walk to the end of the + // next line. + TextLeafPoint end = + start.IsLineFeedChar() + ? start + : start.FindBoundary(nsIAccessibleText::BOUNDARY_LINE_END, eDirNext, + TextLeafPoint::BoundaryFlags::eStopInEditable); + + return GeckoTextMarkerRange(start, end); +} + +GeckoTextMarkerRange GeckoTextMarker::LeftLineRange() const { + TextLeafPoint start = mPoint.FindBoundary( + nsIAccessibleText::BOUNDARY_LINE_START, eDirPrevious, + TextLeafPoint::BoundaryFlags::eStopInEditable | + TextLeafPoint::BoundaryFlags::eIgnoreListItemMarker); + TextLeafPoint end = + start.FindBoundary(nsIAccessibleText::BOUNDARY_LINE_END, eDirNext, + TextLeafPoint::BoundaryFlags::eStopInEditable); + + return GeckoTextMarkerRange(start, end); +} + +GeckoTextMarkerRange GeckoTextMarker::RightLineRange() const { + TextLeafPoint end = + mPoint.FindBoundary(nsIAccessibleText::BOUNDARY_LINE_END, eDirNext, + TextLeafPoint::BoundaryFlags::eStopInEditable); + TextLeafPoint start = + end.FindBoundary(nsIAccessibleText::BOUNDARY_LINE_START, eDirPrevious, + TextLeafPoint::BoundaryFlags::eStopInEditable); + + return GeckoTextMarkerRange(start, end); +} + +GeckoTextMarkerRange GeckoTextMarker::ParagraphRange() const { + // XXX: WebKit gets trapped in inputs. Maybe we shouldn't? + TextLeafPoint end = + mPoint.FindBoundary(nsIAccessibleText::BOUNDARY_PARAGRAPH, eDirNext, + TextLeafPoint::BoundaryFlags::eStopInEditable); + TextLeafPoint start = + end.FindBoundary(nsIAccessibleText::BOUNDARY_PARAGRAPH, eDirPrevious, + TextLeafPoint::BoundaryFlags::eStopInEditable); + + return GeckoTextMarkerRange(start, end); +} + +GeckoTextMarkerRange GeckoTextMarker::StyleRange() const { + if (mPoint.mOffset == 0) { + // If the marker is on the boundary between two leafs, MacOS expects the + // previous leaf. + TextLeafPoint prev = mPoint.FindBoundary( + nsIAccessibleText::BOUNDARY_CHAR, eDirPrevious, + TextLeafPoint::BoundaryFlags::eIgnoreListItemMarker); + if (prev != mPoint) { + return GeckoTextMarker(prev).StyleRange(); + } + } + + TextLeafPoint start(mPoint.mAcc, 0); + TextLeafPoint end(mPoint.mAcc, nsAccUtils::TextLength(mPoint.mAcc)); + return GeckoTextMarkerRange(start, end); +} + +Accessible* GeckoTextMarker::Leaf() { + MOZ_ASSERT(mPoint.mAcc); + Accessible* acc = mPoint.mAcc; + if (mPoint.mOffset == 0) { + // If the marker is on the boundary between two leafs, MacOS expects the + // previous leaf. + TextLeafPoint prev = mPoint.FindBoundary( + nsIAccessibleText::BOUNDARY_CHAR, eDirPrevious, + TextLeafPoint::BoundaryFlags::eIgnoreListItemMarker); + acc = prev.mAcc; + } + + Accessible* parent = acc->Parent(); + return parent && nsAccUtils::MustPrune(parent) ? parent : acc; +} + +// GeckoTextMarkerRange + +GeckoTextMarkerRange::GeckoTextMarkerRange(Accessible* aAccessible) { + mRange = TextLeafRange( + TextLeafPoint(aAccessible, 0), + TextLeafPoint(aAccessible, nsIAccessibleText::TEXT_OFFSET_END_OF_TEXT)); +} + +GeckoTextMarkerRange GeckoTextMarkerRange::MarkerRangeFromAXTextMarkerRange( + Accessible* aDoc, AXTextMarkerRangeRef aTextMarkerRange) { + if (!aTextMarkerRange || + CFGetTypeID(aTextMarkerRange) != AXTextMarkerRangeGetTypeID()) { + return GeckoTextMarkerRange(); + } + + AXTextMarkerRef start_marker( + AXTextMarkerRangeCopyStartMarker(aTextMarkerRange)); + AXTextMarkerRef end_marker(AXTextMarkerRangeCopyEndMarker(aTextMarkerRange)); + + GeckoTextMarker start = + GeckoTextMarker::MarkerFromAXTextMarker(aDoc, start_marker); + GeckoTextMarker end = + GeckoTextMarker::MarkerFromAXTextMarker(aDoc, end_marker); + + CFRelease(start_marker); + CFRelease(end_marker); + + return GeckoTextMarkerRange(start, end); +} + +AXTextMarkerRangeRef GeckoTextMarkerRange::CreateAXTextMarkerRange() { + if (!IsValid()) { + return nil; + } + + GeckoTextMarker start = GeckoTextMarker(mRange.Start()); + GeckoTextMarker end = GeckoTextMarker(mRange.End()); + + AXTextMarkerRangeRef cf_text_marker_range = + AXTextMarkerRangeCreate(kCFAllocatorDefault, start.CreateAXTextMarker(), + end.CreateAXTextMarker()); + + return (__bridge AXTextMarkerRangeRef)[(__bridge id)( + cf_text_marker_range)autorelease]; +} + +NSString* GeckoTextMarkerRange::Text() const { + if (mRange.Start() == mRange.End()) { + return @""; + } + + if ((mRange.Start().mAcc == mRange.End().mAcc) && + (mRange.Start().mAcc->ChildCount() == 0) && + (mRange.Start().mAcc->State() & states::EDITABLE)) { + return @""; + } + + nsAutoString text; + TextLeafPoint prev = mRange.Start().FindBoundary( + nsIAccessibleText::BOUNDARY_CHAR, eDirPrevious); + TextLeafRange range = + prev != mRange.Start() && prev.mAcc->Role() == roles::LISTITEM_MARKER + ? TextLeafRange(TextLeafPoint(prev.mAcc, 0), mRange.End()) + : mRange; + + for (TextLeafRange segment : range) { + TextLeafPoint start = segment.Start(); + if (start.mAcc->IsTextField() && start.mAcc->ChildCount() == 0) { + continue; + } + + start.mAcc->AppendTextTo(text, start.mOffset, + segment.End().mOffset - start.mOffset); + } + + return nsCocoaUtils::ToNSString(text); +} + +static void AppendTextToAttributedString( + NSMutableAttributedString* aAttributedString, Accessible* aAccessible, + const nsString& aString, AccAttributes* aAttributes) { + NSAttributedString* substr = [[[NSAttributedString alloc] + initWithString:nsCocoaUtils::ToNSString(aString) + attributes:utils::StringAttributesFromAccAttributes( + aAttributes, aAccessible)] autorelease]; + + [aAttributedString appendAttributedString:substr]; +} + +NSAttributedString* GeckoTextMarkerRange::AttributedText() const { + NSMutableAttributedString* str = + [[[NSMutableAttributedString alloc] init] autorelease]; + + if (mRange.Start() == mRange.End()) { + return str; + } + + if ((mRange.Start().mAcc == mRange.End().mAcc) && + (mRange.Start().mAcc->ChildCount() == 0) && + (mRange.Start().mAcc->IsTextField())) { + return str; + } + + TextLeafPoint prev = mRange.Start().FindBoundary( + nsIAccessibleText::BOUNDARY_CHAR, eDirPrevious); + TextLeafRange range = + prev != mRange.Start() && prev.mAcc->Role() == roles::LISTITEM_MARKER + ? TextLeafRange(TextLeafPoint(prev.mAcc, 0), mRange.End()) + : mRange; + + nsAutoString text; + RefPtr<AccAttributes> currentRun = nullptr; + Accessible* runAcc = range.Start().mAcc; + for (TextLeafRange segment : range) { + TextLeafPoint start = segment.Start(); + if (start.mAcc->IsTextField() && start.mAcc->ChildCount() == 0) { + continue; + } + if (!currentRun) { + // This is the first segment that isn't an empty input. + currentRun = start.GetTextAttributes(); + } + TextLeafPoint attributesNext; + do { + attributesNext = start.FindTextAttrsStart(eDirNext, false); + if (attributesNext == start) { + // XXX: FindTextAttrsStart should not return the same point. + break; + } + RefPtr<AccAttributes> attributes = start.GetTextAttributes(); + MOZ_ASSERT(attributes); + if (attributes && !attributes->Equal(currentRun)) { + AppendTextToAttributedString(str, runAcc, text, currentRun); + text.Truncate(); + currentRun = attributes; + runAcc = start.mAcc; + } + TextLeafPoint end = + attributesNext < segment.End() ? attributesNext : segment.End(); + start.mAcc->AppendTextTo(text, start.mOffset, + end.mOffset - start.mOffset); + start = attributesNext; + + } while (attributesNext < segment.End()); + } + + if (!text.IsEmpty()) { + AppendTextToAttributedString(str, runAcc, text, currentRun); + } + + return str; +} + +int32_t GeckoTextMarkerRange::Length() const { + int32_t length = 0; + for (TextLeafRange segment : mRange) { + if (segment.End().mAcc->Role() == roles::LISTITEM_MARKER) { + // XXX: MacOS expects bullets to be in the range's text, but not in + // the calculated length! + continue; + } + length += segment.End().mOffset - segment.Start().mOffset; + } + + return length; +} + +NSValue* GeckoTextMarkerRange::Bounds() const { + LayoutDeviceIntRect rect = mRange ? mRange.Bounds() : LayoutDeviceIntRect(); + + NSScreen* mainView = [[NSScreen screens] objectAtIndex:0]; + CGFloat scaleFactor = nsCocoaUtils::GetBackingScaleFactor(mainView); + NSRect r = + NSMakeRect(static_cast<CGFloat>(rect.x) / scaleFactor, + [mainView frame].size.height - + static_cast<CGFloat>(rect.y + rect.height) / scaleFactor, + static_cast<CGFloat>(rect.width) / scaleFactor, + static_cast<CGFloat>(rect.height) / scaleFactor); + + return [NSValue valueWithRect:r]; +} + +void GeckoTextMarkerRange::Select() const { mRange.SetSelection(0); } + +bool GeckoTextMarkerRange::Crop(Accessible* aContainer) { + TextLeafPoint containerStart(aContainer, 0); + TextLeafPoint containerEnd(aContainer, + nsIAccessibleText::TEXT_OFFSET_END_OF_TEXT); + + if (mRange.End() < containerStart || containerEnd < mRange.Start()) { + // The range ends before the container, or starts after it. + return false; + } + + if (mRange.Start() < containerStart) { + // If range start is before container start, adjust range start to + // start of container. + mRange.SetStart(containerStart); + } + + if (containerEnd < mRange.End()) { + // If range end is after container end, adjust range end to end of + // container. + mRange.SetEnd(containerEnd); + } + + return true; +} +} // namespace a11y +} // namespace mozilla |