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

static String selectMisspellingAsync(Frame* selectedFrame, DocumentMarker& marker)
{
    VisibleSelection selection = selectedFrame->selection()->selection();
    if (!selection.isCaretOrRange())
        return String();

    // Caret and range selections always return valid normalized ranges.
    RefPtr<Range> selectionRange = selection.toNormalizedRange();
    Vector<DocumentMarker*> markers = selectedFrame->document()->markers()->markersInRange(selectionRange.get(), DocumentMarker::Spelling | DocumentMarker::Grammar);
    if (markers.size() != 1)
        return String();
    marker = *markers[0];

    // Cloning a range fails only for invalid ranges.
    RefPtr<Range> markerRange = selectionRange->cloneRange(ASSERT_NO_EXCEPTION);
    markerRange->setStart(markerRange->startContainer(), marker.startOffset());
    markerRange->setEnd(markerRange->endContainer(), marker.endOffset());
    if (selection.isCaret()) {
        selection = VisibleSelection(markerRange.get());
        selectedFrame->selection()->setSelection(selection, WordGranularity);
        selectionRange = selection.toNormalizedRange();
    }

    if (markerRange->text().stripWhiteSpace(&IsWhiteSpaceOrPunctuation) != selectionRange->text().stripWhiteSpace(&IsWhiteSpaceOrPunctuation))
        return String();

    return markerRange->text();
}

void SpellChecker::markMisspellingsAfterTypingToWord(const VisiblePosition &wordStart, const VisibleSelection& selectionAfterTyping)
{
    if (unifiedTextCheckerEnabled()) {
        TextCheckingTypeMask textCheckingOptions = 0;

        if (isContinuousSpellCheckingEnabled())
            textCheckingOptions |= TextCheckingTypeSpelling;

        if (!(textCheckingOptions & TextCheckingTypeSpelling))
            return;

        if (isGrammarCheckingEnabled())
            textCheckingOptions |= TextCheckingTypeGrammar;

        VisibleSelection adjacentWords = VisibleSelection(startOfWord(wordStart, LeftWordIfOnBoundary), endOfWord(wordStart, RightWordIfOnBoundary));
        if (textCheckingOptions & TextCheckingTypeGrammar) {
            VisibleSelection selectedSentence = VisibleSelection(startOfSentence(wordStart), endOfSentence(wordStart));
            markAllMisspellingsAndBadGrammarInRanges(textCheckingOptions, adjacentWords.toNormalizedRange().get(), selectedSentence.toNormalizedRange().get());
        } else {
            markAllMisspellingsAndBadGrammarInRanges(textCheckingOptions, adjacentWords.toNormalizedRange().get(), adjacentWords.toNormalizedRange().get());
        }
        return;
    }

    if (!isContinuousSpellCheckingEnabled())
        return;

    // Check spelling of one word
    RefPtr<Range> misspellingRange = nullptr;
    markMisspellings(VisibleSelection(startOfWord(wordStart, LeftWordIfOnBoundary), endOfWord(wordStart, RightWordIfOnBoundary)), misspellingRange);

    // Autocorrect the misspelled word.
    if (!misspellingRange)
        return;

    // Get the misspelled word.
    const String misspelledWord = plainText(misspellingRange.get());
    String autocorrectedString = textChecker().getAutoCorrectSuggestionForMisspelledWord(misspelledWord);

    // If autocorrected word is non empty, replace the misspelled word by this word.
    if (!autocorrectedString.isEmpty()) {
        VisibleSelection newSelection(misspellingRange.get(), DOWNSTREAM);
        if (newSelection != m_frame.selection().selection()) {
            m_frame.selection().setSelection(newSelection);
        }

        m_frame.editor().replaceSelectionWithText(autocorrectedString, false, false);

        // Reset the charet one character further.
        m_frame.selection().moveTo(m_frame.selection().selection().visibleEnd());
        m_frame.selection().modify(FrameSelection::AlterationMove, DirectionForward, CharacterGranularity);
    }

    if (!isGrammarCheckingEnabled())
        return;

    // Check grammar of entire sentence
    markBadGrammar(VisibleSelection(startOfSentence(wordStart), endOfSentence(wordStart)));
}

void SpellChecker::respondToChangedSelection(const VisibleSelection& oldSelection, FrameSelection::SetSelectionOptions options)
{
    bool closeTyping = options & FrameSelection::CloseTyping;
    bool isContinuousSpellCheckingEnabled = this->isContinuousSpellCheckingEnabled();
    bool isContinuousGrammarCheckingEnabled = isContinuousSpellCheckingEnabled && isGrammarCheckingEnabled();
    if (isContinuousSpellCheckingEnabled) {
        VisibleSelection newAdjacentWords;
        VisibleSelection newSelectedSentence;
        const VisibleSelection newSelection = m_frame.selection().selection();
        VisiblePosition newStart(newSelection.visibleStart());
        newAdjacentWords = VisibleSelection(startOfWord(newStart, LeftWordIfOnBoundary), endOfWord(newStart, RightWordIfOnBoundary));
        if (isContinuousGrammarCheckingEnabled)
            newSelectedSentence = VisibleSelection(startOfSentence(newStart), endOfSentence(newStart));

        // Don't check spelling and grammar if the change of selection is triggered by spelling correction itself.
        bool shouldCheckSpellingAndGrammar = !(options & FrameSelection::SpellCorrectionTriggered);

        // When typing we check spelling elsewhere, so don't redo it here.
        // If this is a change in selection resulting from a delete operation,
        // oldSelection may no longer be in the document.
        // FIXME(http://crbug.com/382809): if oldSelection is on a textarea
        // element, we cause synchronous layout.
        if (shouldCheckSpellingAndGrammar
            && closeTyping
            && !isSelectionInTextField(oldSelection)
            && (isSelectionInTextArea(oldSelection) || oldSelection.isContentEditable())
            && oldSelection.start().inDocument()) {
            spellCheckOldSelection(oldSelection, newAdjacentWords);
        }

        // FIXME(http://crbug.com/382809):
        // shouldEraseMarkersAfterChangeSelection is true, we cause synchronous
        // layout.
        if (textChecker().shouldEraseMarkersAfterChangeSelection(TextCheckingTypeSpelling)) {
            if (RefPtr<Range> wordRange = newAdjacentWords.toNormalizedRange())
                m_frame.document()->markers().removeMarkers(wordRange.get(), DocumentMarker::Spelling);
        }
        if (textChecker().shouldEraseMarkersAfterChangeSelection(TextCheckingTypeGrammar)) {
            if (RefPtr<Range> sentenceRange = newSelectedSentence.toNormalizedRange())
                m_frame.document()->markers().removeMarkers(sentenceRange.get(), DocumentMarker::Grammar);
        }
    }

    // When continuous spell checking is off, existing markers disappear after the selection changes.
    if (!isContinuousSpellCheckingEnabled)
        m_frame.document()->markers().removeMarkers(DocumentMarker::Spelling);
    if (!isContinuousGrammarCheckingEnabled)
        m_frame.document()->markers().removeMarkers(DocumentMarker::Grammar);
}

RefPtr<TextIndicator> TextIndicator::createWithRange(const Range& range, TextIndicatorPresentationTransition presentationTransition, unsigned margin)
{
    Frame* frame = range.startContainer()->document().frame();

    if (!frame)
        return nullptr;

#if PLATFORM(IOS)
    frame->editor().setIgnoreCompositionSelectionChange(true);
    frame->selection().setUpdateAppearanceEnabled(true);
#endif

    VisibleSelection oldSelection = frame->selection().selection();
    frame->selection().setSelection(range);

    RefPtr<TextIndicator> indicator = TextIndicator::createWithSelectionInFrame(*frame, presentationTransition, margin);

    frame->selection().setSelection(oldSelection);

    if (indicator)
        indicator->setWantsMargin(!areRangesEqual(&range, oldSelection.toNormalizedRange().get()));

#if PLATFORM(IOS)
    frame->editor().setIgnoreCompositionSelectionChange(false, Editor::RevealSelection::No);
    frame->selection().setUpdateAppearanceEnabled(false);
#endif

    return indicator.release();
}

static void expandSelectionToGranularity(Frame* frame, int x, int y, TextGranularity granularity, bool isInputMode)
{
    ASSERT(frame);
    ASSERT(frame->selection());

    VisibleSelection selection;
    if (x < 0 || y < 0) {
        if (!isInputMode)
            return; // Invalid request

        // Input mode based selection, use the current selection as the selection point.
        ASSERT(frame->selection()->selectionType() != VisibleSelection::NoSelection);
        selection = frame->selection()->selection();
    } else {
        VisiblePosition pointLocation(frame->visiblePositionForPoint(WebCore::IntPoint(x, y)));
        selection = VisibleSelection(pointLocation, pointLocation);
    }

    if (!(selection.start().anchorNode() && selection.start().anchorNode()->isTextNode()))
        return;

    selection.expandUsingGranularity(granularity);
    RefPtr<Range> newRange = selection.toNormalizedRange();
    if (!newRange)
        return;
    ExceptionCode ec = 0;
    if (newRange->collapsed(ec))
        return;
    RefPtr<Range> oldRange = frame->selection()->selection().toNormalizedRange();
    EAffinity affinity = frame->selection()->affinity();
    if (isInputMode && !frame->editor()->client()->shouldChangeSelectedRange(oldRange.get(), newRange.get(), affinity, false))
        return;
    frame->selection()->setSelectedRange(newRange.get(), affinity, true);
}

bool selectionBelongsToObject(AccessibilityObject* coreObject, VisibleSelection& selection)
{
    if (!coreObject || !coreObject->isAccessibilityRenderObject())
        return false;

    if (selection.isNone())
        return false;

    RefPtr<Range> range = selection.toNormalizedRange();
    if (!range)
        return false;

    // We want to check that both the selection intersects the node
    // AND that the selection is not just "touching" one of the
    // boundaries for the selected node. We want to check whether the
    // node is actually inside the region, at least partially.
    auto& node = *coreObject->node();
    auto* lastDescendant = node.lastDescendant();
    unsigned lastOffset = lastOffsetInNode(lastDescendant);
    auto intersectsResult = range->intersectsNode(node);
    return !intersectsResult.hasException()
           && intersectsResult.releaseReturnValue()
           && (&range->endContainer() != &node || range->endOffset())
           && (&range->startContainer() != lastDescendant || range->startOffset() != lastOffset);
}

void SpellChecker::markMisspellingsOrBadGrammar(const VisibleSelection& selection, bool checkSpelling, RefPtr<Range>& firstMisspellingRange)
{
    // This function is called with a selection already expanded to word boundaries.
    // Might be nice to assert that here.

    // This function is used only for as-you-type checking, so if that's off we do nothing. Note that
    // grammar checking can only be on if spell checking is also on.
    if (!isContinuousSpellCheckingEnabled())
        return;

    RefPtr<Range> searchRange(selection.toNormalizedRange());
    if (!searchRange)
        return;

    // If we're not in an editable node, bail.
    Node* editableNode = searchRange->startContainer();
    if (!editableNode || !editableNode->hasEditableStyle())
        return;

    if (!isSpellCheckingEnabledFor(editableNode))
        return;

    TextCheckingHelper checker(spellCheckerClient(), searchRange);
    if (checkSpelling)
        checker.markAllMisspellings(firstMisspellingRange);
    else if (isGrammarCheckingEnabled())
        checker.markAllBadGrammar();
}

static bool setSelectionToDragCaret(Frame* frame, VisibleSelection& dragCaret, RefPtr<Range>& range, const IntPoint& point)
{
    frame->selection()->setSelection(dragCaret);
    if (frame->selection()->isNone()) {
        dragCaret = frame->visiblePositionForPoint(point);
        frame->selection()->setSelection(dragCaret);
        range = dragCaret.toNormalizedRange();
    }
    return !frame->selection()->isNone() && frame->selection()->isContentEditable();
}

static void getSelectionOffsetsForObject(AccessibilityObject* coreObject, VisibleSelection& selection, gint& startOffset, gint& endOffset)
{
    if (!coreObject->isAccessibilityRenderObject())
        return;

    // Early return if the selection doesn't affect the selected node.
    if (!selectionBelongsToObject(coreObject, selection))
        return;

    // We need to find the exact start and end positions in the
    // selected node that intersects the selection, to later on get
    // the right values for the effective start and end offsets.
    ExceptionCode ec = 0;
    Position nodeRangeStart;
    Position nodeRangeEnd;
    Node* node = coreObject->node();
    RefPtr<Range> selRange = selection.toNormalizedRange();

    // If the selection affects the selected node and its first
    // possible position is also in the selection, we must set
    // nodeRangeStart to that position, otherwise to the selection's
    // start position (it would belong to the node anyway).
    Node* firstLeafNode = node->firstDescendant();
    if (selRange->isPointInRange(firstLeafNode, 0, ec))
        nodeRangeStart = firstPositionInOrBeforeNode(firstLeafNode);
    else
        nodeRangeStart = selRange->startPosition();

    // If the selection affects the selected node and its last
    // possible position is also in the selection, we must set
    // nodeRangeEnd to that position, otherwise to the selection's
    // end position (it would belong to the node anyway).
    Node* lastLeafNode = node->lastDescendant();
    if (selRange->isPointInRange(lastLeafNode, lastOffsetInNode(lastLeafNode), ec))
        nodeRangeEnd = lastPositionInOrAfterNode(lastLeafNode);
    else
        nodeRangeEnd = selRange->endPosition();

    // Calculate position of the selected range inside the object.
    Position parentFirstPosition = firstPositionInOrBeforeNode(node);
    RefPtr<Range> rangeInParent = Range::create(node->document(), parentFirstPosition, nodeRangeStart);

    // Set values for start and end offsets.
    startOffset = TextIterator::rangeLength(rangeInParent.get(), true);

    // We need to adjust the offsets for the list item marker.
    RenderObject* renderer = coreObject->renderer();
    if (renderer && renderer->isListItem()) {
        String markerText = toRenderListItem(renderer)->markerTextWithSuffix();
        startOffset += markerText.length();
    }

    RefPtr<Range> nodeRange = Range::create(node->document(), nodeRangeStart, nodeRangeEnd);
    endOffset = startOffset + TextIterator::rangeLength(nodeRange.get(), true);
}

void SpellChecker::markMisspellingsAndBadGrammar(const VisibleSelection& spellingSelection, bool markGrammar, const VisibleSelection& grammarSelection)
{
    if (unifiedTextCheckerEnabled()) {
        if (!isContinuousSpellCheckingEnabled())
            return;

        // markMisspellingsAndBadGrammar() is triggered by selection change, in which case we check spelling and grammar, but don't autocorrect misspellings.
        TextCheckingTypeMask textCheckingOptions = TextCheckingTypeSpelling;
        if (markGrammar && isGrammarCheckingEnabled())
            textCheckingOptions |= TextCheckingTypeGrammar;
        markAllMisspellingsAndBadGrammarInRanges(textCheckingOptions, spellingSelection.toNormalizedRange().get(), grammarSelection.toNormalizedRange().get());
        return;
    }

    RefPtr<Range> firstMisspellingRange = nullptr;
    markMisspellings(spellingSelection, firstMisspellingRange);
    if (markGrammar)
        markBadGrammar(grammarSelection);
}

VisibleSelection visibleSelectionForClosestActualWordStart(const VisibleSelection& selection)
{
    // VisibleSelection validation has a special case when the caret is at the end of a paragraph where
    // it selects the paragraph marker. As well, if the position is at the end of a word, it will select
    // only the space between words. We want to select an actual word so we move the selection to
    // the start of the leftmost word if the character after the selection point is whitespace.

    if (selection.selectionType() != VisibleSelection::RangeSelection) {
        int leftDistance = 0;
        int rightDistance = 0;

        VisibleSelection leftSelection(previousWordPosition(selection.start()));
        bool leftSelectionIsOnWord = !isWhitespace(leftSelection.visibleStart().characterAfter()) && leftSelection.start().containerNode() == selection.start().containerNode();
        if (leftSelectionIsOnWord) {
            VisibleSelection rangeSelection(endOfWord(leftSelection.start()), selection.visibleStart());
            leftDistance = TextIterator::rangeLength(rangeSelection.toNormalizedRange().get());
        }

        VisibleSelection rightSelection = previousWordPosition(nextWordPosition(selection.start()));
        bool rightSelectionIsOnWord = !isWhitespace(rightSelection.visibleStart().characterAfter()) && rightSelection.start().containerNode() == selection.start().containerNode();
        if (rightSelectionIsOnWord) {
            VisibleSelection rangeSelection = VisibleSelection(rightSelection.visibleStart(), selection.visibleStart());
            rightDistance = TextIterator::rangeLength(rangeSelection.toNormalizedRange().get());
        }

        // Make sure we found an actual word. If not, return the original selection.
        if (!leftSelectionIsOnWord && !rightSelectionIsOnWord)
            return selection;

        if (!rightSelectionIsOnWord || (leftSelectionIsOnWord && leftDistance <= rightDistance)) {
            // Left is closer or right is invalid.
            return leftSelection;
        }

        // Right is closer or equal, or left was invalid.
        return rightSelection;
    }

    // No adjustment required.
    return selection;
}

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);
    }
}

static String selectMisspellingAsync(LocalFrame* selectedFrame, DocumentMarker& marker)
{
    VisibleSelection selection = selectedFrame->selection().selection();
    if (!selection.isCaretOrRange())
        return String();

    // Caret and range selections always return valid normalized ranges.
    RefPtrWillBeRawPtr<Range> selectionRange = selection.toNormalizedRange();
    WillBeHeapVector<DocumentMarker*> markers = selectedFrame->document()->markers().markersInRange(selectionRange.get(), DocumentMarker::MisspellingMarkers());
    if (markers.size() != 1)
        return String();
    marker = *markers[0];

    // Cloning a range fails only for invalid ranges.
    RefPtrWillBeRawPtr<Range> markerRange = selectionRange->cloneRange();
    markerRange->setStart(markerRange->startContainer(), marker.startOffset());
    markerRange->setEnd(markerRange->endContainer(), marker.endOffset());

    if (markerRange->text().stripWhiteSpace(&IsWhiteSpaceOrPunctuation) != selectionRange->text().stripWhiteSpace(&IsWhiteSpaceOrPunctuation))
        return String();

    return markerRange->text();
}

RefPtr<TextIndicator> TextIndicator::createWithRange(const Range& range, TextIndicatorOptions options, TextIndicatorPresentationTransition presentationTransition, FloatSize margin)
{
    Frame* frame = range.startContainer().document().frame();

    if (!frame)
        return nullptr;

#if PLATFORM(IOS)
    frame->editor().setIgnoreCompositionSelectionChange(true);
    frame->selection().setUpdateAppearanceEnabled(true);
#endif

    VisibleSelection oldSelection = frame->selection().selection();
    frame->selection().setSelection(range);

    TextIndicatorData data;

    data.presentationTransition = presentationTransition;
    data.options = options;

    bool indicatesCurrentSelection = areRangesEqual(&range, oldSelection.toNormalizedRange().get());

    if (!initializeIndicator(data, *frame, range, margin, indicatesCurrentSelection))
        return nullptr;

    RefPtr<TextIndicator> indicator = TextIndicator::create(data);

    frame->selection().setSelection(oldSelection);

#if PLATFORM(IOS)
    frame->editor().setIgnoreCompositionSelectionChange(false, Editor::RevealSelection::No);
    frame->selection().setUpdateAppearanceEnabled(false);
#endif

    return indicator;
}

void TypingCommand::forwardDeleteKeyPressed(TextGranularity granularity, bool killRing)
{
    Frame* frame = document()->frame();
    if (!frame)
        return;

    frame->editor()->updateMarkersForWordsAffectedByEditing(false);

    VisibleSelection selectionToDelete;
    VisibleSelection selectionAfterUndo;

    switch (endingSelection().selectionType()) {
    case VisibleSelection::RangeSelection:
        selectionToDelete = endingSelection();
        selectionAfterUndo = selectionToDelete;
        break;
    case VisibleSelection::CaretSelection: {
        m_smartDelete = false;

        // Handle delete at beginning-of-block case.
        // Do nothing in the case that the caret is at the start of a
        // root editable element or at the start of a document.
        FrameSelection selection;
        selection.setSelection(endingSelection());
        selection.modify(FrameSelection::AlterationExtend, DirectionForward, granularity);
        if (killRing && selection.isCaret() && granularity != CharacterGranularity)
            selection.modify(FrameSelection::AlterationExtend, DirectionForward, CharacterGranularity);

        Position downstreamEnd = endingSelection().end().downstream();
        VisiblePosition visibleEnd = endingSelection().visibleEnd();
        Node* enclosingTableCell = enclosingNodeOfType(visibleEnd.deepEquivalent(), &isTableCell);
        if (enclosingTableCell && visibleEnd == lastPositionInNode(enclosingTableCell))
            return;
        if (visibleEnd == endOfParagraph(visibleEnd))
            downstreamEnd = visibleEnd.next(CannotCrossEditingBoundary).deepEquivalent().downstream();
        // When deleting tables: Select the table first, then perform the deletion
        if (downstreamEnd.containerNode() && downstreamEnd.containerNode()->renderer() && downstreamEnd.containerNode()->renderer()->isTable()
            && downstreamEnd.computeOffsetInContainerNode() <= caretMinOffset(downstreamEnd.containerNode())) {
            setEndingSelection(VisibleSelection(endingSelection().end(), positionAfterNode(downstreamEnd.containerNode()), DOWNSTREAM, endingSelection().isDirectional()));
            typingAddedToOpenCommand(ForwardDeleteKey);
            return;
        }

        // deleting to end of paragraph when at end of paragraph needs to merge the next paragraph (if any)
        if (granularity == ParagraphBoundary && selection.selection().isCaret() && isEndOfParagraph(selection.selection().visibleEnd()))
            selection.modify(FrameSelection::AlterationExtend, DirectionForward, CharacterGranularity);

        selectionToDelete = selection.selection();
        if (!startingSelection().isRange() || selectionToDelete.base() != startingSelection().start())
            selectionAfterUndo = selectionToDelete;
        else {
            // It's a little tricky to compute what the starting selection would have been in the original document.
            // We can't let the VisibleSelection class's validation kick in or it'll adjust for us based on
            // the current state of the document and we'll get the wrong result.
            Position extent = startingSelection().end();
            if (extent.containerNode() != selectionToDelete.end().containerNode())
                extent = selectionToDelete.extent();
            else {
                int extraCharacters;
                if (selectionToDelete.start().containerNode() == selectionToDelete.end().containerNode())
                    extraCharacters = selectionToDelete.end().computeOffsetInContainerNode() - selectionToDelete.start().computeOffsetInContainerNode();
                else
                    extraCharacters = selectionToDelete.end().computeOffsetInContainerNode();
                extent = Position(extent.containerNode(), extent.computeOffsetInContainerNode() + extraCharacters, Position::PositionIsOffsetInAnchor);
            }
            selectionAfterUndo.setWithoutValidation(startingSelection().start(), extent);
        }
        break;
    }
    case VisibleSelection::NoSelection:
        ASSERT_NOT_REACHED();
        break;
    }
    
    ASSERT(!selectionToDelete.isNone());
    if (selectionToDelete.isNone())
        return;
    
    if (selectionToDelete.isCaret() || !frame->selection()->shouldDeleteSelection(selectionToDelete))
        return;
        
    if (killRing)
        frame->editor()->addToKillRing(selectionToDelete.toNormalizedRange().get(), false);
    // make undo select what was deleted
    setStartingSelection(selectionAfterUndo);
    CompositeEditCommand::deleteSelection(selectionToDelete, m_smartDelete);
    setSmartDelete(false);
    typingAddedToOpenCommand(ForwardDeleteKey);
}