C++ VisibleSelection::visibleEnd方法代码示例

static char* webkitAccessibleTextGetWordForBoundary(AtkText* text, int offset, AtkTextBoundary boundaryType, GetTextRelativePosition textPosition, int* startOffset, int* endOffset)
{
    AccessibilityObject* coreObject = core(text);
    Document* document = coreObject->document();
    if (!document)
        return emptyTextSelectionAtOffset(0, startOffset, endOffset);

    Node* node = getNodeForAccessibilityObject(coreObject);
    if (!node)
        return emptyTextSelectionAtOffset(0, startOffset, endOffset);

    int actualOffset = atkOffsetToWebCoreOffset(text, offset);

    // Besides of the usual conversion from ATK offsets to WebCore offsets,
    // we need to consider the potential embedded objects that might have been
    // inserted in the text exposed through AtkText when calculating the offset.
    actualOffset -= numberOfReplacedElementsBeforeOffset(text, actualOffset);

    VisiblePosition caretPosition = coreObject->visiblePositionForIndex(actualOffset);
    VisibleSelection currentWord = wordAtPositionForAtkBoundary(coreObject, caretPosition, boundaryType);

    // Take into account other relative positions, if needed, by
    // calculating the new position that we would need to consider.
    VisiblePosition newPosition = caretPosition;
    switch (textPosition) {
    case GetTextPositionAt:
        break;

    case GetTextPositionBefore:
        // Early return if asking for the previous word while already at the beginning.
        if (isFirstVisiblePositionInNode(currentWord.visibleStart(), node))
            return emptyTextSelectionAtOffset(0, startOffset, endOffset);

        if (isStartOfLine(currentWord.end()))
            newPosition = currentWord.visibleStart().previous();
        else
            newPosition = startOfWord(currentWord.start(), LeftWordIfOnBoundary);
        break;

    case GetTextPositionAfter:
        // Early return if asking for the following word while already at the end.
        if (isLastVisiblePositionInNode(currentWord.visibleEnd(), node))
            return emptyTextSelectionAtOffset(accessibilityObjectLength(coreObject), startOffset, endOffset);

        if (isEndOfLine(currentWord.end()))
            newPosition = currentWord.visibleEnd().next();
        else
            newPosition = endOfWord(currentWord.end(), RightWordIfOnBoundary);
        break;

    default:
        ASSERT_NOT_REACHED();
    }

    // Determine the relevant word we are actually interested in
    // and calculate the ATK offsets for it, then return everything.
    VisibleSelection selectedWord = newPosition != caretPosition ? wordAtPositionForAtkBoundary(coreObject, newPosition, boundaryType) : currentWord;
    getSelectionOffsetsForObject(coreObject, selectedWord, *startOffset, *endOffset);
    return webkitAccessibleTextGetText(text, *startOffset, *endOffset);
}

void ApplyBlockElementCommand::doApply()
{
    if (!endingSelection().rootEditableElement())
        return;

    VisiblePosition visibleEnd = endingSelection().visibleEnd();
    VisiblePosition visibleStart = endingSelection().visibleStart();
    if (visibleStart.isNull() || visibleStart.isOrphan() || visibleEnd.isNull() || visibleEnd.isOrphan())
        return;

    // When a selection ends at the start of a paragraph, we rarely paint
    // the selection gap before that paragraph, because there often is no gap.
    // In a case like this, it's not obvious to the user that the selection
    // ends "inside" that paragraph, so it would be confusing if Indent/Outdent
    // operated on that paragraph.
    // FIXME: We paint the gap before some paragraphs that are indented with left
    // margin/padding, but not others.  We should make the gap painting more consistent and
    // then use a left margin/padding rule here.
    if (visibleEnd != visibleStart && isStartOfParagraph(visibleEnd)) {
        VisibleSelection newSelection(visibleStart, visibleEnd.previous(CannotCrossEditingBoundary), endingSelection().isDirectional());
        if (newSelection.isNone())
            return;
        setEndingSelection(newSelection);
    }

    VisibleSelection selection = selectionForParagraphIteration(endingSelection());
    VisiblePosition startOfSelection = selection.visibleStart();
    VisiblePosition endOfSelection = selection.visibleEnd();
    ASSERT(!startOfSelection.isNull());
    ASSERT(!endOfSelection.isNull());
    RefPtrWillBeRawPtr<ContainerNode> startScope = nullptr;
    int startIndex = indexForVisiblePosition(startOfSelection, startScope);
    RefPtrWillBeRawPtr<ContainerNode> endScope = nullptr;
    int endIndex = indexForVisiblePosition(endOfSelection, endScope);

    formatSelection(startOfSelection, endOfSelection);

    document().updateLayoutIgnorePendingStylesheets();

    ASSERT(startScope == endScope);
    ASSERT(startIndex >= 0);
    ASSERT(startIndex <= endIndex);
    if (startScope == endScope && startIndex >= 0 && startIndex <= endIndex) {
        VisiblePosition start(visiblePositionForIndex(startIndex, startScope.get()));
        VisiblePosition end(visiblePositionForIndex(endIndex, endScope.get()));
        if (start.isNotNull() && end.isNotNull())
            setEndingSelection(VisibleSelection(start, end, endingSelection().isDirectional()));
    }
}

void IndentOutdentCommand::indentRegion()
{
    VisibleSelection selection = selectionForParagraphIteration(endingSelection());
    VisiblePosition startOfSelection = selection.visibleStart();
    VisiblePosition endOfSelection = selection.visibleEnd();
    int startIndex = indexForVisiblePosition(startOfSelection);
    int endIndex = indexForVisiblePosition(endOfSelection);

    ASSERT(!startOfSelection.isNull());
    ASSERT(!endOfSelection.isNull());

    // Special case empty unsplittable elements because there's nothing to split
    // and there's nothing to move.
    Position start = startOfSelection.deepEquivalent().downstream();
    if (isAtUnsplittableElement(start)) {
        RefPtr<Element> blockquote = createIndentBlockquoteElement(document());
        insertNodeAt(blockquote, start);
        RefPtr<Element> placeholder = createBreakElement(document());
        appendNode(placeholder, blockquote);
        setEndingSelection(VisibleSelection(Position(placeholder.get(), 0), DOWNSTREAM));
        return;
    }

    RefPtr<Element> blockquoteForNextIndent;
    VisiblePosition endOfCurrentParagraph = endOfParagraph(startOfSelection);
    VisiblePosition endAfterSelection = endOfParagraph(endOfParagraph(endOfSelection).next());
    while (endOfCurrentParagraph != endAfterSelection) {
        // Iterate across the selected paragraphs...
        VisiblePosition endOfNextParagraph = endOfParagraph(endOfCurrentParagraph.next());
        if (tryIndentingAsListItem(endOfCurrentParagraph))
            blockquoteForNextIndent = 0;
        else
            indentIntoBlockquote(endOfCurrentParagraph, endOfNextParagraph, blockquoteForNextIndent);
        // blockquoteForNextIndent maybe updated
        // this is due to the way prepareBlockquoteLevelForInsertion was designed.
        // Sanity check: Make sure our moveParagraph calls didn't remove endOfNextParagraph.deepEquivalent().node()
        // If somehow we did, return to prevent crashes.
        if (endOfNextParagraph.isNotNull() && !endOfNextParagraph.deepEquivalent().node()->inDocument()) {
            ASSERT_NOT_REACHED();
            return;
        }
        endOfCurrentParagraph = endOfNextParagraph;
    }

    RefPtr<Range> startRange = TextIterator::rangeFromLocationAndLength(document()->documentElement(), startIndex, 0, true);
    RefPtr<Range> endRange = TextIterator::rangeFromLocationAndLength(document()->documentElement(), endIndex, 0, true);
    if (startRange && endRange)
        setEndingSelection(VisibleSelection(startRange->startPosition(), endRange->startPosition(), DOWNSTREAM));
}

bool InsertListCommand::selectionHasListOfType(const VisibleSelection& selection, const HTMLQualifiedName& listTag)
{
    VisiblePosition start = selection.visibleStart();

    if (!enclosingList(start.deepEquivalent().deprecatedNode()))
        return false;

    VisiblePosition end = startOfParagraph(selection.visibleEnd());
    while (start.isNotNull() && start != end) {
        HTMLElement* listElement = enclosingList(start.deepEquivalent().deprecatedNode());
        if (!listElement || !listElement->hasTagName(listTag))
            return false;
        start = startOfNextParagraph(start);
    }

    return true;
}

bool InsertListCommand::modifyRange()
{
    VisibleSelection selection = selectionForParagraphIteration(endingSelection());
    ASSERT(selection.isRange());
    VisiblePosition startOfSelection = selection.visibleStart();
    VisiblePosition endOfSelection = selection.visibleEnd();
    VisiblePosition startOfLastParagraph = startOfParagraph(endOfSelection);
    
    if (startOfParagraph(startOfSelection) == startOfLastParagraph)
        return false;

    Node* startList = enclosingList(startOfSelection.deepEquivalent().node());
    Node* endList = enclosingList(endOfSelection.deepEquivalent().node());
    if (!startList || startList != endList)
        m_forceCreateList = true;

    setEndingSelection(startOfSelection);
    doApply();
    // Fetch the start of the selection after moving the first paragraph,
    // because moving the paragraph will invalidate the original start.  
    // We'll use the new start to restore the original selection after 
    // we modified all selected paragraphs.
    startOfSelection = endingSelection().visibleStart();
    VisiblePosition startOfCurrentParagraph = startOfNextParagraph(startOfSelection);
    while (startOfCurrentParagraph != startOfLastParagraph) {
        // doApply() may operate on and remove the last paragraph of the selection from the document 
        // if it's in the same list item as startOfCurrentParagraph.  Return early to avoid an 
        // infinite loop and because there is no more work to be done.
        // FIXME(<rdar://problem/5983974>): The endingSelection() may be incorrect here.  Compute 
        // the new location of endOfSelection and use it as the end of the new selection.
        if (!startOfLastParagraph.deepEquivalent().node()->inDocument())
            return true;
        setEndingSelection(startOfCurrentParagraph);
        doApply();
        startOfCurrentParagraph = startOfNextParagraph(endingSelection().visibleStart());
    }
    setEndingSelection(endOfSelection);
    doApply();
    // Fetch the end of the selection, for the reason mentioned above.
    endOfSelection = endingSelection().visibleEnd();
    setEndingSelection(VisibleSelection(startOfSelection, endOfSelection));
    m_forceCreateList = false;
    return true;
}

void IndentOutdentCommand::doApply()
{
    if (!endingSelection().isNonOrphanedCaretOrRange())
        return;

    if (!endingSelection().rootEditableElement())
        return;
        
    VisiblePosition visibleEnd = endingSelection().visibleEnd();
    VisiblePosition visibleStart = endingSelection().visibleStart();
    // When a selection ends at the start of a paragraph, we rarely paint 
    // the selection gap before that paragraph, because there often is no gap.  
    // In a case like this, it's not obvious to the user that the selection 
    // ends "inside" that paragraph, so it would be confusing if Indent/Outdent 
    // operated on that paragraph.
    // FIXME: We paint the gap before some paragraphs that are indented with left 
    // margin/padding, but not others.  We should make the gap painting more consistent and 
    // then use a left margin/padding rule here.
    if (visibleEnd != visibleStart && isStartOfParagraph(visibleEnd))
        setEndingSelection(VisibleSelection(visibleStart, visibleEnd.previous(true)));

    VisibleSelection selection = selectionForParagraphIteration(endingSelection());
    VisiblePosition startOfSelection = selection.visibleStart();
    VisiblePosition endOfSelection = selection.visibleEnd();
    
    int startIndex = indexForVisiblePosition(startOfSelection);
    int endIndex = indexForVisiblePosition(endOfSelection);
    
    ASSERT(!startOfSelection.isNull());
    ASSERT(!endOfSelection.isNull());
    
    if (m_typeOfAction == Indent)
        indentRegion(startOfSelection, endOfSelection);
    else
        outdentRegion(startOfSelection, endOfSelection);

    updateLayout();
    
    RefPtr<Range> startRange = TextIterator::rangeFromLocationAndLength(document()->documentElement(), startIndex, 0, true);
    RefPtr<Range> endRange = TextIterator::rangeFromLocationAndLength(document()->documentElement(), endIndex, 0, true);
    if (startRange && endRange)
        setEndingSelection(VisibleSelection(startRange->startPosition(), endRange->startPosition(), DOWNSTREAM));
}

bool InsertListCommand::selectionHasListOfType(
    const VisibleSelection& selection,
    const HTMLQualifiedName& listTag) {
    DCHECK(!document().needsLayoutTreeUpdate());
    DocumentLifecycle::DisallowTransitionScope disallowTransition(
        document().lifecycle());

    VisiblePosition start = selection.visibleStart();

    if (!enclosingList(start.deepEquivalent().anchorNode()))
        return false;

    VisiblePosition end = startOfParagraph(selection.visibleEnd());
    while (start.isNotNull() && start.deepEquivalent() != end.deepEquivalent()) {
        HTMLElement* listElement =
            enclosingList(start.deepEquivalent().anchorNode());
        if (!listElement || !listElement->hasTagName(listTag))
            return false;
        start = startOfNextParagraph(start);
    }

    return true;
}

void SpellChecker::markMisspellingsAfterLineBreak(const VisibleSelection& wordSelection)
{
    if (unifiedTextCheckerEnabled()) {
        TextCheckingTypeMask textCheckingOptions = 0;

        if (isContinuousSpellCheckingEnabled())
            textCheckingOptions |= TextCheckingTypeSpelling;

        if (isGrammarCheckingEnabled())
            textCheckingOptions |= TextCheckingTypeGrammar;

        VisibleSelection wholeParagraph(
            startOfParagraph(wordSelection.visibleStart()),
            endOfParagraph(wordSelection.visibleEnd()));

        markAllMisspellingsAndBadGrammarInRanges(
            textCheckingOptions, wordSelection.toNormalizedRange().get(),
            wholeParagraph.toNormalizedRange().get());
    } else {
        RefPtr<Range> misspellingRange = wordSelection.firstRange();
        markMisspellings(wordSelection, misspellingRange);
    }
}

void InsertListCommand::doApply()
{
    if (!endingSelection().isNonOrphanedCaretOrRange())
        return;

    if (!endingSelection().rootEditableElement())
        return;

    VisiblePosition visibleEnd = endingSelection().visibleEnd();
    VisiblePosition visibleStart = endingSelection().visibleStart();
    // When a selection ends at the start of a paragraph, we rarely paint
    // the selection gap before that paragraph, because there often is no gap.
    // In a case like this, it's not obvious to the user that the selection
    // ends "inside" that paragraph, so it would be confusing if InsertUn{Ordered}List
    // operated on that paragraph.
    // FIXME: We paint the gap before some paragraphs that are indented with left
    // margin/padding, but not others.  We should make the gap painting more consistent and
    // then use a left margin/padding rule here.
    if (visibleEnd != visibleStart && isStartOfParagraph(visibleEnd, CanSkipOverEditingBoundary)) {
        setEndingSelection(VisibleSelection(visibleStart, visibleEnd.previous(CannotCrossEditingBoundary), endingSelection().isDirectional()));
        if (!endingSelection().rootEditableElement())
            return;
    }

    const HTMLQualifiedName& listTag = (m_type == OrderedList) ? olTag : ulTag;
    if (endingSelection().isRange()) {
        bool forceListCreation = false;
        VisibleSelection selection = selectionForParagraphIteration(endingSelection());
        ASSERT(selection.isRange());
        VisiblePosition startOfSelection = selection.visibleStart();
        VisiblePosition endOfSelection = selection.visibleEnd();
        VisiblePosition startOfLastParagraph = startOfParagraph(endOfSelection, CanSkipOverEditingBoundary);

        RefPtrWillBeRawPtr<Range> currentSelection = endingSelection().firstRange();
        RefPtrWillBeRawPtr<ContainerNode> scopeForStartOfSelection = nullptr;
        RefPtrWillBeRawPtr<ContainerNode> scopeForEndOfSelection = nullptr;
        // FIXME: This is an inefficient way to keep selection alive because
        // indexForVisiblePosition walks from the beginning of the document to the
        // endOfSelection everytime this code is executed. But not using index is hard
        // because there are so many ways we can los eselection inside doApplyForSingleParagraph.
        int indexForStartOfSelection = indexForVisiblePosition(startOfSelection, scopeForStartOfSelection);
        int indexForEndOfSelection = indexForVisiblePosition(endOfSelection, scopeForEndOfSelection);

        if (startOfParagraph(startOfSelection, CanSkipOverEditingBoundary) != startOfLastParagraph) {
            forceListCreation = !selectionHasListOfType(selection, listTag);

            VisiblePosition startOfCurrentParagraph = startOfSelection;
            while (startOfCurrentParagraph.isNotNull() && !inSameParagraph(startOfCurrentParagraph, startOfLastParagraph, CanCrossEditingBoundary)) {
                // doApply() may operate on and remove the last paragraph of the selection from the document
                // if it's in the same list item as startOfCurrentParagraph.  Return early to avoid an
                // infinite loop and because there is no more work to be done.
                // FIXME(<rdar://problem/5983974>): The endingSelection() may be incorrect here.  Compute
                // the new location of endOfSelection and use it as the end of the new selection.
                if (!startOfLastParagraph.deepEquivalent().inDocument())
                    return;
                setEndingSelection(startOfCurrentParagraph);

                // Save and restore endOfSelection and startOfLastParagraph when necessary
                // since moveParagraph and movePragraphWithClones can remove nodes.
                doApplyForSingleParagraph(forceListCreation, listTag, *currentSelection);
                if (endOfSelection.isNull() || endOfSelection.isOrphan() || startOfLastParagraph.isNull() || startOfLastParagraph.isOrphan()) {
                    endOfSelection = visiblePositionForIndex(indexForEndOfSelection, scopeForEndOfSelection.get());
                    // If endOfSelection is null, then some contents have been deleted from the document.
                    // This should never happen and if it did, exit early immediately because we've lost the loop invariant.
                    ASSERT(endOfSelection.isNotNull());
                    if (endOfSelection.isNull() || !endOfSelection.rootEditableElement())
                        return;
                    startOfLastParagraph = startOfParagraph(endOfSelection, CanSkipOverEditingBoundary);
                }

                startOfCurrentParagraph = startOfNextParagraph(endingSelection().visibleStart());
            }
            setEndingSelection(endOfSelection);
        }
        doApplyForSingleParagraph(forceListCreation, listTag, *currentSelection);
        // Fetch the end of the selection, for the reason mentioned above.
        if (endOfSelection.isNull() || endOfSelection.isOrphan()) {
            endOfSelection = visiblePositionForIndex(indexForEndOfSelection, scopeForEndOfSelection.get());
            if (endOfSelection.isNull())
                return;
        }
        if (startOfSelection.isNull() || startOfSelection.isOrphan()) {
            startOfSelection = visiblePositionForIndex(indexForStartOfSelection, scopeForStartOfSelection.get());
            if (startOfSelection.isNull())
                return;
        }
        setEndingSelection(VisibleSelection(startOfSelection, endOfSelection, endingSelection().isDirectional()));
        return;
    }

    ASSERT(endingSelection().firstRange());
    doApplyForSingleParagraph(false, listTag, *endingSelection().firstRange());
}

void InsertListCommand::doApply(EditingState* editingState) {
    // Only entry points are Editor::Command::execute and
    // IndentOutdentCommand::outdentParagraph, both of which ensure clean layout.
    DCHECK(!document().needsLayoutTreeUpdate());

    if (!endingSelection().isNonOrphanedCaretOrRange())
        return;

    if (!endingSelection().rootEditableElement())
        return;

    VisiblePosition visibleEnd = endingSelection().visibleEnd();
    VisiblePosition visibleStart = endingSelection().visibleStart();
    // When a selection ends at the start of a paragraph, we rarely paint
    // the selection gap before that paragraph, because there often is no gap.
    // In a case like this, it's not obvious to the user that the selection
    // ends "inside" that paragraph, so it would be confusing if
    // InsertUn{Ordered}List operated on that paragraph.
    // FIXME: We paint the gap before some paragraphs that are indented with left
    // margin/padding, but not others.  We should make the gap painting more
    // consistent and then use a left margin/padding rule here.
    if (visibleEnd.deepEquivalent() != visibleStart.deepEquivalent() &&
            isStartOfParagraph(visibleEnd, CanSkipOverEditingBoundary)) {
        setEndingSelection(createVisibleSelection(
                               visibleStart,
                               previousPositionOf(visibleEnd, CannotCrossEditingBoundary),
                               endingSelection().isDirectional()));
        if (!endingSelection().rootEditableElement())
            return;
    }

    const HTMLQualifiedName& listTag = (m_type == OrderedList) ? olTag : ulTag;
    if (endingSelection().isRange()) {
        bool forceListCreation = false;
        VisibleSelection selection =
            selectionForParagraphIteration(endingSelection());
        DCHECK(selection.isRange());

        VisiblePosition visibleStartOfSelection = selection.visibleStart();
        VisiblePosition visibleEndOfSelection = selection.visibleEnd();
        PositionWithAffinity startOfSelection =
            visibleStartOfSelection.toPositionWithAffinity();
        PositionWithAffinity endOfSelection =
            visibleEndOfSelection.toPositionWithAffinity();
        Position startOfLastParagraph =
            startOfParagraph(visibleEndOfSelection, CanSkipOverEditingBoundary)
            .deepEquivalent();

        Range* currentSelection = firstRangeOf(endingSelection());
        ContainerNode* scopeForStartOfSelection = nullptr;
        ContainerNode* scopeForEndOfSelection = nullptr;
        // FIXME: This is an inefficient way to keep selection alive because
        // indexForVisiblePosition walks from the beginning of the document to the
        // visibleEndOfSelection everytime this code is executed. But not using
        // index is hard because there are so many ways we can lose selection inside
        // doApplyForSingleParagraph.
        int indexForStartOfSelection = indexForVisiblePosition(
                                           visibleStartOfSelection, scopeForStartOfSelection);
        int indexForEndOfSelection =
            indexForVisiblePosition(visibleEndOfSelection, scopeForEndOfSelection);

        if (startOfParagraph(visibleStartOfSelection, CanSkipOverEditingBoundary)
                .deepEquivalent() != startOfLastParagraph) {
            forceListCreation = !selectionHasListOfType(selection, listTag);

            VisiblePosition startOfCurrentParagraph = visibleStartOfSelection;
            while (inSameTreeAndOrdered(startOfCurrentParagraph.deepEquivalent(),
                                        startOfLastParagraph) &&
                    !inSameParagraph(startOfCurrentParagraph,
                                     createVisiblePosition(startOfLastParagraph),
                                     CanCrossEditingBoundary)) {
                // doApply() may operate on and remove the last paragraph of the
                // selection from the document if it's in the same list item as
                // startOfCurrentParagraph. Return early to avoid an infinite loop and
                // because there is no more work to be done.
                // FIXME(<rdar://problem/5983974>): The endingSelection() may be
                // incorrect here.  Compute the new location of visibleEndOfSelection
                // and use it as the end of the new selection.
                if (!startOfLastParagraph.isConnected())
                    return;
                setEndingSelection(startOfCurrentParagraph);

                // Save and restore visibleEndOfSelection and startOfLastParagraph when
                // necessary since moveParagraph and movePragraphWithClones can remove
                // nodes.
                bool singleParagraphResult = doApplyForSingleParagraph(
                                                 forceListCreation, listTag, *currentSelection, editingState);
                if (editingState->isAborted())
                    return;
                if (!singleParagraphResult)
                    break;

                document().updateStyleAndLayoutIgnorePendingStylesheets();

                // Make |visibleEndOfSelection| valid again.
                if (!endOfSelection.isConnected() ||
                        !startOfLastParagraph.isConnected()) {
                    visibleEndOfSelection = visiblePositionForIndex(
                                                indexForEndOfSelection, scopeForEndOfSelection);
                    endOfSelection = visibleEndOfSelection.toPositionWithAffinity();
//.........这里部分代码省略.........