C++ SelectionController类代码示例

bool DOMSelection::containsNode(const Node* n, bool allowPartial) const
{
    if (!m_frame)
        return false;

    SelectionController* selection = m_frame->selection();

    if (!n || selection->isNone())
        return false;

    Node* parentNode = n->parentNode();
    unsigned nodeIndex = n->nodeIndex();
    RefPtr<Range> selectedRange = selection->selection().toNormalizedRange();

    if (!parentNode)
        return false;

    ExceptionCode ec = 0;
    bool nodeFullySelected = Range::compareBoundaryPoints(parentNode, nodeIndex, selectedRange->startContainer(ec), selectedRange->startOffset(ec)) >= 0
        && Range::compareBoundaryPoints(parentNode, nodeIndex + 1, selectedRange->endContainer(ec), selectedRange->endOffset(ec)) <= 0;
    ASSERT(!ec);
    if (nodeFullySelected)
        return true;

    bool nodeFullyUnselected = Range::compareBoundaryPoints(parentNode, nodeIndex, selectedRange->endContainer(ec), selectedRange->endOffset(ec)) > 0
        || Range::compareBoundaryPoints(parentNode, nodeIndex + 1, selectedRange->startContainer(ec), selectedRange->startOffset(ec)) < 0;
    ASSERT(!ec);
    if (nodeFullyUnselected)
        return false;

    return allowPartial || n->isTextNode();
}

void SVGTextContentElement::selectSubString(long charnum, long nchars, ExceptionCode& ec) const
{
    long numberOfChars = getNumberOfChars();
    if (charnum < 0 || nchars < 0 || charnum > numberOfChars) {
        ec = INDEX_SIZE_ERR;
        return;
    }

    if (nchars > numberOfChars - charnum)
        nchars = numberOfChars - charnum;

    ASSERT(document());
    ASSERT(document()->frame());

    SelectionController* controller = document()->frame()->selection();
    if (!controller)
        return;

    // Find selection start
    VisiblePosition start(const_cast<SVGTextContentElement*>(this), 0, SEL_DEFAULT_AFFINITY);
    for (long i = 0; i < charnum; ++i)
        start = start.next();

    // Find selection end
    VisiblePosition end(start);
    for (long i = 0; i < nchars; ++i)
        end = end.next();

    controller->setSelection(Selection(start, end));
}

static void clearSelectionIfNeeded(Frame* oldFocusedFrame, Frame* newFocusedFrame, Node* newFocusedNode)
{
    if (!oldFocusedFrame || !newFocusedFrame)
        return;
        
    if (oldFocusedFrame->document() != newFocusedFrame->document())
        return;
    
    SelectionController* s = oldFocusedFrame->selection();
    if (s->isNone())
        return;

    bool caretBrowsing = oldFocusedFrame->settings()->caretBrowsingEnabled();
    if (caretBrowsing)
        return;

    Node* selectionStartNode = s->selection().start().node();
    if (selectionStartNode == newFocusedNode || selectionStartNode->isDescendantOf(newFocusedNode) || selectionStartNode->shadowAncestorNode() == newFocusedNode)
        return;
        
    if (Node* mousePressNode = newFocusedFrame->eventHandler()->mousePressNode())
        if (mousePressNode->renderer() && !mousePressNode->canStartSelection())
            if (Node* root = s->rootEditableElement())
                if (Node* shadowAncestorNode = root->shadowAncestorNode())
                    // Don't do this for textareas and text fields, when they lose focus their selections should be cleared
                    // and then restored when they regain focus, to match other browsers.
                    if (!shadowAncestorNode->hasTagName(inputTag) && !shadowAncestorNode->hasTagName(textareaTag))
                        return;
    
    s->clear();
}

void SVGTextContentElement::selectSubString(unsigned charnum, unsigned nchars, ExceptionCode& ec) const
{
    unsigned numberOfChars = getNumberOfChars();
    if (charnum >= numberOfChars) {
        ec = INDEX_SIZE_ERR;
        return;
    }

    if (nchars > numberOfChars - charnum)
        nchars = numberOfChars - charnum;

    ASSERT(document());
    ASSERT(document()->frame());

    SelectionController* controller = document()->frame()->selection();
    if (!controller)
        return;

    // Find selection start
    VisiblePosition start(firstPositionInNode(const_cast<SVGTextContentElement*>(this)));
    for (unsigned i = 0; i < charnum; ++i)
        start = start.next();

    // Find selection end
    VisiblePosition end(start);
    for (unsigned i = 0; i < nchars; ++i)
        end = end.next();

    controller->setSelection(VisibleSelection(start, end));
}

WebCore::IntRect SelectionHandler::selectionEndCaretRect()
{
    if (!m_selectionActive)
        return IntRect();

    ASSERT(m_webPage && m_webPage->focusedOrMainFrame() && m_webPage->focusedOrMainFrame()->selection());

    WebCore::IntRect caretLocation(m_webPage->focusedOrMainFrame()->selection()->selection().visibleEnd().absoluteCaretBounds());

    SelectionController nextCaretSelection;
    nextCaretSelection.setSelection(VisibleSelection(m_webPage->focusedOrMainFrame()->selection()->selection().visibleEnd()));
    nextCaretSelection.modify(SelectionController::AlterationMove, SelectionController::DirectionForward, CharacterGranularity);
    WebCore::IntRect nextCaretLocation(nextCaretSelection.selection().visibleStart().absoluteCaretBounds());

    if (nextCaretLocation.y() == caretLocation.y()) {
        // The next caret position is on this line, use the middle of the character
        // as the active selection point.
        caretLocation.move((nextCaretLocation.x() - caretLocation.x()) / 2, 0);
    } else {
        // Caret position is at the end of a line, advance 1 pixel to ensure
        // overlap with character.
        caretLocation.move(1, 0);
    }

    if (m_webPage->focusedOrMainFrame()->ownerRenderer()) {
        WebCore::IntPoint frameOffset = m_webPage->focusedOrMainFrame()->ownerRenderer()->absoluteContentBox().location();
        caretLocation.move(frameOffset.x(), frameOffset.y());
    }
    return caretLocation;
}

String DOMSelection::type() const
{
    if (!m_frame)
        return String();

    SelectionController* selection = m_frame->selection();

    // This is a WebKit DOM extension, incompatible with an IE extension
    // IE has this same attribute, but returns "none", "text" and "control"
    // http://msdn.microsoft.com/en-us/library/ms534692(VS.85).aspx
    if (selection->isNone())
        return "None";
    if (selection->isCaret())
        return "Caret";
    return "Range";
}

void DOMSelection::extend(Node* node, int offset, ExceptionCode& ec)
{
    if (!m_frame)
        return;

    if (!node) {
        ec = TYPE_MISMATCH_ERR;
        return;
    }
    if (offset < 0 || offset > (node->offsetInCharacters() ? caretMaxOffset(node) : (int)node->childNodeCount())) {
        ec = INDEX_SIZE_ERR;
        return;
    }

    SelectionController* selection = m_frame->selection();
    selection->expandUsingGranularity(CharacterGranularity);
    selection->setExtent(VisiblePosition(node, offset, DOWNSTREAM));
}

void DOMSelection::deleteFromDocument()
{
    if (!m_frame)
        return;

    SelectionController* selection = m_frame->selection();

    if (selection->isNone())
        return;

    if (isCollapsed())
        selection->modify(SelectionController::EXTEND, SelectionController::BACKWARD, CharacterGranularity);

    RefPtr<Range> selectedRange = selection->selection().toNormalizedRange();

    ExceptionCode ec = 0;
    selectedRange->deleteContents(ec);
    ASSERT(!ec);

    setBaseAndExtent(selectedRange->startContainer(ec), selectedRange->startOffset(ec), selectedRange->startContainer(ec), selectedRange->startOffset(ec), ec);
    ASSERT(!ec);
}

static void clearSelectionIfNeeded(Frame* oldFocusedFrame, Frame* newFocusedFrame, Node* newFocusedNode)
{
    if (!oldFocusedFrame || !newFocusedFrame)
        return;
        
    if (oldFocusedFrame->document() != newFocusedFrame->document())
        return;
    
    SelectionController* s = oldFocusedFrame->selection();
    if (s->isNone())
        return;

    bool caretBrowsing = oldFocusedFrame->settings()->caretBrowsingEnabled();
    if (caretBrowsing)
        return;

    Node* selectionStartNode = s->selection().start().deprecatedNode();
    if (selectionStartNode == newFocusedNode || selectionStartNode->isDescendantOf(newFocusedNode) || selectionStartNode->shadowAncestorNode() == newFocusedNode)
        return;
        
    if (Node* mousePressNode = newFocusedFrame->eventHandler()->mousePressNode()) {
        if (mousePressNode->renderer() && !mousePressNode->canStartSelection()) {
            // Don't clear the selection for contentEditable elements, but do clear it for input and textarea. See bug 38696.
            Node * root = s->rootEditableElement();
            if (!root)
                return;

            if (Node* shadowAncestorNode = root->shadowAncestorNode()) {
                if (!shadowAncestorNode->hasTagName(inputTag) && !shadowAncestorNode->hasTagName(textareaTag))
                    return;
            }
        }
    }
    
    s->clear();
}

void DOMSelection::addRange(Range* r)
{
    if (!m_frame)
        return;
    if (!r)
        return;

    SelectionController* selection = m_frame->selection();

    if (selection->isNone()) {
        selection->setSelection(VisibleSelection(r));
        return;
    }

    RefPtr<Range> range = selection->selection().toNormalizedRange();
    ExceptionCode ec = 0;
    if (r->compareBoundaryPoints(Range::START_TO_START, range.get(), ec) == -1) {
        // We don't support discontiguous selection. We don't do anything if r and range don't intersect.
        if (r->compareBoundaryPoints(Range::START_TO_END, range.get(), ec) > -1) {
            if (r->compareBoundaryPoints(Range::END_TO_END, range.get(), ec) == -1)
                // The original range and r intersect.
                selection->setSelection(VisibleSelection(r->startPosition(), range->endPosition(), DOWNSTREAM));
            else
                // r contains the original range.
                selection->setSelection(VisibleSelection(r));
        }
    } else {
        // We don't support discontiguous selection. We don't do anything if r and range don't intersect.
        if (r->compareBoundaryPoints(Range::END_TO_START, range.get(), ec) < 1) {
            if (r->compareBoundaryPoints(Range::END_TO_END, range.get(), ec) == -1)
                // The original range contains r.
                selection->setSelection(VisibleSelection(range.get()));
            else
                // The original range and r intersect.
                selection->setSelection(VisibleSelection(range->startPosition(), r->endPosition(), DOWNSTREAM));
        }
    }
}

//.........这里部分代码省略.........
                    appendItem(*separatorItem());
#if PLATFORM(MAC)
                    appendItem(LookInDictionaryItem);
                    appendItem(*separatorItem());
#endif
                }
                appendItem(CopyItem);
            } else {
#if PLATFORM(GTK)
                appendItem(BackItem);
                appendItem(ForwardItem);
                appendItem(StopItem);
                appendItem(ReloadItem);
#else
                if (loader->canGoBackOrForward(-1))
                    appendItem(BackItem);

                if (loader->canGoBackOrForward(1))
                    appendItem(ForwardItem);

                // use isLoadingInAPISense rather than isLoading because Stop/Reload are
                // intended to match WebKit's API, not WebCore's internal notion of loading status
                if (loader->documentLoader()->isLoadingInAPISense())
                    appendItem(StopItem);
                else
                    appendItem(ReloadItem);
#endif

                if (frame->page() && frame != frame->page()->mainFrame())
                    appendItem(OpenFrameItem);
            }
        }
    } else { // Make an editing context menu
        SelectionController* selection = frame->selection();
        bool inPasswordField = selection->isInPasswordField();
        
        if (!inPasswordField) {
            // Consider adding spelling-related or grammar-related context menu items (never both, since a single selected range
            // is never considered a misspelling and bad grammar at the same time)
            bool misspelling = frame->editor()->isSelectionMisspelled();
            bool badGrammar = !misspelling && (frame->editor()->isGrammarCheckingEnabled() && frame->editor()->isSelectionUngrammatical());
            
            if (misspelling || badGrammar) {
                Vector<String> guesses = misspelling ? frame->editor()->guessesForMisspelledSelection()
                    : frame->editor()->guessesForUngrammaticalSelection();
                size_t size = guesses.size();
                if (size == 0) {
                    // If there's bad grammar but no suggestions (e.g., repeated word), just leave off the suggestions
                    // list and trailing separator rather than adding a "No Guesses Found" item (matches AppKit)
                    if (misspelling) {
                        appendItem(NoGuessesItem);
                        appendItem(*separatorItem());
                    }
                } else {
                    for (unsigned i = 0; i < size; i++) {
                        const String &guess = guesses[i];
                        if (!guess.isEmpty()) {
                            ContextMenuItem item(ActionType, ContextMenuItemTagSpellingGuess, guess);
                            appendItem(item);
                        }
                    }
                    appendItem(*separatorItem());                    
                }
                
                if (misspelling) {
                    appendItem(IgnoreSpellingItem);

void TypingCommand::forwardDeleteKeyPressed(TextGranularity granularity, bool killRing)
{
#if REMOVE_MARKERS_UPON_EDITING
    document()->frame()->editor()->removeSpellAndCorrectionMarkersFromWordsToBeEdited(false);
#endif
    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.
        SelectionController selection;
        selection.setSelection(endingSelection());
        selection.modify(SelectionController::AlterationExtend, DirectionForward, granularity);
        if (killRing && selection.isCaret() && granularity != CharacterGranularity)
            selection.modify(SelectionController::AlterationExtend, DirectionForward, CharacterGranularity);

        Position downstreamEnd = endingSelection().end().downstream();
        VisiblePosition visibleEnd = endingSelection().visibleEnd();
        if (visibleEnd == endOfParagraph(visibleEnd))
            downstreamEnd = visibleEnd.next(true).deepEquivalent().downstream();
        // When deleting tables: Select the table first, then perform the deletion
        if (downstreamEnd.node() && downstreamEnd.node()->renderer() && downstreamEnd.node()->renderer()->isTable() && !downstreamEnd.deprecatedEditingOffset()) {
            setEndingSelection(VisibleSelection(endingSelection().end(), lastDeepEditingPositionForNode(downstreamEnd.node()), DOWNSTREAM));
            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(SelectionController::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.node() != selectionToDelete.end().node())
                extent = selectionToDelete.extent();
            else {
                int extraCharacters;
                if (selectionToDelete.start().node() == selectionToDelete.end().node())
                    extraCharacters = selectionToDelete.end().deprecatedEditingOffset() - selectionToDelete.start().deprecatedEditingOffset();
                else
                    extraCharacters = selectionToDelete.end().deprecatedEditingOffset();
                extent = Position(extent.node(), extent.deprecatedEditingOffset() + 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() || !document()->frame()->selection()->shouldDeleteSelection(selectionToDelete))
        return;
        
    if (killRing)
        document()->frame()->editor()->addToKillRing(selectionToDelete.toNormalizedRange().get(), false);
    // make undo select what was deleted
    setStartingSelection(selectionAfterUndo);
    CompositeEditCommand::deleteSelection(selectionToDelete, m_smartDelete);
    setSmartDelete(false);
    typingAddedToOpenCommand(ForwardDeleteKey);
}

void TypingCommand::forwardDeleteKeyPressed(TextGranularity granularity)
{
    Selection selectionToDelete;
    Selection selectionAfterUndo;

    switch (endingSelection().state()) {
        case Selection::RANGE:
            selectionToDelete = endingSelection();
            selectionAfterUndo = selectionToDelete;
            break;
        case Selection::CARET: {
            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.
            SelectionController selection;
            selection.setSelection(endingSelection());
            selection.modify(SelectionController::EXTEND, SelectionController::FORWARD, granularity);
            Position downstreamEnd = endingSelection().end().downstream();
            VisiblePosition visibleEnd = endingSelection().visibleEnd();
            if (visibleEnd == endOfParagraph(visibleEnd))
                downstreamEnd = visibleEnd.next(true).deepEquivalent().downstream();
            // When deleting tables: Select the table first, then perform the deletion
            if (downstreamEnd.node() && downstreamEnd.node()->renderer() && downstreamEnd.node()->renderer()->isTable() && downstreamEnd.offset() == 0) {
                setEndingSelection(Selection(endingSelection().end(), Position(downstreamEnd.node(), maxDeepOffset(downstreamEnd.node())), DOWNSTREAM));
                typingAddedToOpenCommand();
                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(SelectionController::EXTEND, SelectionController::FORWARD, 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 Selection 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.node() != selectionToDelete.end().node())
                    extent = selectionToDelete.extent();
                else {
                    int extraCharacters;
                    if (selectionToDelete.start().node() == selectionToDelete.end().node())
                        extraCharacters = selectionToDelete.end().offset() - selectionToDelete.start().offset();
                    else
                        extraCharacters = selectionToDelete.end().offset();
                    extent = Position(extent.node(), extent.offset() + extraCharacters);
                }
                selectionAfterUndo.setWithoutValidation(startingSelection().start(), extent);
            }
            break;
        }
        case Selection::NONE:
            ASSERT_NOT_REACHED();
            break;
    }
    
    if (selectionToDelete.isCaretOrRange() && document()->frame()->shouldDeleteSelection(selectionToDelete)) {
        // make undo select what was deleted
        setStartingSelection(selectionAfterUndo);
        CompositeEditCommand::deleteSelection(selectionToDelete, m_smartDelete);
        setSmartDelete(false);
        typingAddedToOpenCommand();
    }
}