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

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);
}

//.........这里部分代码省略.........
    // If it's not a link, an image, a media element, or an image/media link,
    // show a selection menu or a more generic page menu.
    if (selectedFrame->document()->loader())
        data.frameEncoding = selectedFrame->document()->encoding();

    // Send the frame and page URLs in any case.
    data.pageURL = urlFromFrame(m_webView->mainFrameImpl()->frame());
    if (selectedFrame != m_webView->mainFrameImpl()->frame()) {
        data.frameURL = urlFromFrame(selectedFrame);
        RefPtr<HistoryItem> historyItem = selectedFrame->loader()->history()->currentItem();
        if (historyItem)
            data.frameHistoryItem = WebHistoryItem(historyItem);
    }

    if (r.isSelected()) {
        if (!r.innerNonSharedNode()->hasTagName(HTMLNames::inputTag) || !static_cast<HTMLInputElement*>(r.innerNonSharedNode())->isPasswordField())
            data.selectedText = selectedFrame->editor()->selectedText().stripWhiteSpace();
    }

    if (r.isContentEditable()) {
        data.isEditable = true;
#if ENABLE(INPUT_SPEECH)
        if (r.innerNonSharedNode()->hasTagName(HTMLNames::inputTag)) {
            data.isSpeechInputEnabled = 
                static_cast<HTMLInputElement*>(r.innerNonSharedNode())->isSpeechEnabled();
        }  
#endif
        // When Chrome enables asynchronous spellchecking, its spellchecker adds spelling markers to misspelled
        // words and attaches suggestions to these markers in the background. Therefore, when a user right-clicks
        // a mouse on a word, Chrome just needs to find a spelling marker on the word instread of spellchecking it.
        if (selectedFrame->settings() && selectedFrame->settings()->asynchronousSpellCheckingEnabled()) {
            VisibleSelection selection = selectedFrame->selection()->selection();
            if (selection.isCaret()) {
                selection.expandUsingGranularity(WordGranularity);
                RefPtr<Range> range = selection.toNormalizedRange();
                Vector<DocumentMarker*> markers = selectedFrame->document()->markers()->markersInRange(range.get(), DocumentMarker::Spelling | DocumentMarker::Grammar);
                if (markers.size() == 1) {
                    range->setStart(range->startContainer(), markers[0]->startOffset());
                    range->setEnd(range->endContainer(), markers[0]->endOffset());
                    data.misspelledWord = range->text();
                    if (markers[0]->description().length()) {
                        Vector<String> suggestions;
                        markers[0]->description().split('\n', suggestions);
                        data.dictionarySuggestions = suggestions;
                    } else if (m_webView->spellCheckClient()) {
                        int misspelledOffset, misspelledLength;
                        m_webView->spellCheckClient()->spellCheck(data.misspelledWord, misspelledOffset, misspelledLength, &data.dictionarySuggestions);
                    }
                    selection = VisibleSelection(range.get());
                    if (selectedFrame->selection()->shouldChangeSelection(selection))
                        selectedFrame->selection()->setSelection(selection, WordGranularity);
                }
            }
        } else if (m_webView->focusedWebCoreFrame()->editor()->isContinuousSpellCheckingEnabled()) {
            data.isSpellCheckingEnabled = true;
            // Spellchecking might be enabled for the field, but could be disabled on the node.
            if (m_webView->focusedWebCoreFrame()->editor()->isSpellCheckingEnabledInFocusedNode()) {
                data.misspelledWord = selectMisspelledWord(defaultMenu, selectedFrame);
                if (m_webView->spellCheckClient()) {
                    int misspelledOffset, misspelledLength;
                    m_webView->spellCheckClient()->spellCheck(
                        data.misspelledWord, misspelledOffset, misspelledLength,
                        &data.dictionarySuggestions);
                    if (!misspelledLength)
                        data.misspelledWord.reset();
                }

int Frame::checkOverflowScroll(OverflowScrollAction action)
{
    Position extent = selection().selection().extent();
    if (extent.isNull())
        return OverflowScrollNone;

    RenderObject* renderer = extent.deprecatedNode()->renderer();
    if (!renderer)
        return OverflowScrollNone;

    FrameView* view = this->view();
    if (!view)
        return OverflowScrollNone;

    RenderBlock* containingBlock = renderer->containingBlock();
    if (!containingBlock || !containingBlock->hasOverflowClip())
        return OverflowScrollNone;
    RenderLayer* layer = containingBlock->layer();
    ASSERT(layer);

    IntRect visibleRect = IntRect(view->scrollX(), view->scrollY(), view->visibleWidth(), view->visibleHeight());
    IntPoint position = m_overflowAutoScrollPos;
    if (visibleRect.contains(position.x(), position.y()))
        return OverflowScrollNone;

    int scrollType = 0;
    int deltaX = 0;
    int deltaY = 0;
    IntPoint selectionPosition;

    // This constant will make the selection draw a little bit beyond the edge of the visible area.
    // This prevents a visual glitch, in that you can fail to select a portion of a character that
    // is being rendered right at the edge of the visible rectangle.
    // FIXME: This probably needs improvement, and may need to take the font size into account.
    static const int scrollBoundsAdjustment = 3;

    // FIXME: Make a small buffer at the end of a visible rectangle so that autoscrolling works 
    // even if the visible extends to the limits of the screen.
    if (position.x() < visibleRect.x()) {
        scrollType |= OverflowScrollLeft;
        if (action == PerformOverflowScroll) {
            deltaX -= static_cast<int>(m_overflowAutoScrollDelta);
            selectionPosition.setX(view->scrollX() - scrollBoundsAdjustment);
        }
    } else if (position.x() > visibleRect.maxX()) {
        scrollType |= OverflowScrollRight;
        if (action == PerformOverflowScroll) {
            deltaX += static_cast<int>(m_overflowAutoScrollDelta);
            selectionPosition.setX(view->scrollX() + view->visibleWidth() + scrollBoundsAdjustment);
        }
    }

    if (position.y() < visibleRect.y()) {
        scrollType |= OverflowScrollUp;
        if (action == PerformOverflowScroll) {
            deltaY -= static_cast<int>(m_overflowAutoScrollDelta);
            selectionPosition.setY(view->scrollY() - scrollBoundsAdjustment);
        }
    } else if (position.y() > visibleRect.maxY()) {
        scrollType |= OverflowScrollDown;
        if (action == PerformOverflowScroll) {
            deltaY += static_cast<int>(m_overflowAutoScrollDelta);
            selectionPosition.setY(view->scrollY() + view->visibleHeight() + scrollBoundsAdjustment);
        }
    }

    Ref<Frame> protectedThis(*this);

    if (action == PerformOverflowScroll && (deltaX || deltaY)) {
        layer->scrollToOffset(layer->scrollOffset() + IntSize(deltaX, deltaY));

        // Handle making selection.
        VisiblePosition visiblePosition(renderer->positionForPoint(selectionPosition, nullptr));
        if (visiblePosition.isNotNull()) {
            VisibleSelection visibleSelection = selection().selection();
            visibleSelection.setExtent(visiblePosition);
            if (selection().granularity() != CharacterGranularity)
                visibleSelection.expandUsingGranularity(selection().granularity());
            if (selection().shouldChangeSelection(visibleSelection))
                selection().setSelection(visibleSelection);
        }

        m_overflowAutoScrollDelta *= 1.02f; // Accelerate the scroll
    }
    return scrollType;
}