frame.cpp

来自「linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自Web」· C++ 代码 · 共 1,782 行 · 第 1/4 页

            String result = searchForLabelsAboveCell(regExp.get(), startingTableCell);
            if (!result.isEmpty())
                return result;
            searchedCellAbove = true;
        } else if (n->isTextNode() && n->renderer() && n->renderer()->style()->visibility() == VISIBLE) {
            // For each text chunk, run the regexp
            String nodeString = n->nodeValue();
            // add 100 for slop, to make it more likely that we'll search whole nodes
            if (lengthSearched + nodeString.length() > maxCharsSearched)
                nodeString = nodeString.right(charsSearchedThreshold - lengthSearched);
            int pos = regExp->searchRev(nodeString);
            if (pos >= 0)
                return nodeString.substring(pos, regExp->matchedLength());
            lengthSearched += nodeString.length();
        }
    }

    // If we started in a cell, but bailed because we found the start of the form or the
    // previous element, we still might need to search the row above us for a label.
    if (startingTableCell && !searchedCellAbove) {
         return searchForLabelsAboveCell(regExp.get(), startingTableCell);
    }
    return String();
}

String Frame::matchLabelsAgainstElement(const Vector<String>& labels, Element* element)
{
    String name = element->getAttribute(nameAttr);
    if (name.isEmpty())
        return String();

    // Make numbers and _'s in field names behave like word boundaries, e.g., "address2"
    replace(name, RegularExpression("\\d", TextCaseSensitive), " ");
    name.replace('_', ' ');
    
    OwnPtr<RegularExpression> regExp(createRegExpForLabels(labels));
    // Use the largest match we can find in the whole name string
    int pos;
    int length;
    int bestPos = -1;
    int bestLength = -1;
    int start = 0;
    do {
        pos = regExp->match(name, start);
        if (pos != -1) {
            length = regExp->matchedLength();
            if (length >= bestLength) {
                bestPos = pos;
                bestLength = length;
            }
            start = pos + 1;
        }
    } while (pos != -1);

    if (bestPos != -1)
        return name.substring(bestPos, bestLength);
    return String();
}

const VisibleSelection& Frame::mark() const
{
    return m_mark;
}

void Frame::setMark(const VisibleSelection& s)
{
    ASSERT(!s.base().node() || s.base().node()->document() == document());
    ASSERT(!s.extent().node() || s.extent().node()->document() == document());
    ASSERT(!s.start().node() || s.start().node()->document() == document());
    ASSERT(!s.end().node() || s.end().node()->document() == document());

    m_mark = s;
}

void Frame::notifyRendererOfSelectionChange(bool userTriggered)
{
    RenderObject* renderer = 0;
    if (selection()->rootEditableElement())
        renderer = selection()->rootEditableElement()->shadowAncestorNode()->renderer();

    // If the current selection is in a textfield or textarea, notify the renderer that the selection has changed
    if (renderer && renderer->isTextControl())
        toRenderTextControl(renderer)->selectionChanged(userTriggered);
}

void Frame::invalidateSelection()
{
    selection()->setNeedsLayout();
    selectionLayoutChanged();
}

void Frame::setCaretVisible(bool flag)
{
    if (m_caretVisible == flag)
        return;
    clearCaretRectIfNeeded();
    m_caretVisible = flag;
    selectionLayoutChanged();
}

void Frame::clearCaretRectIfNeeded()
{
#if ENABLE(TEXT_CARET)
    if (m_caretPaint) {
        m_caretPaint = false;
        selection()->invalidateCaretRect();
    }
#endif
}

// Helper function that tells whether a particular node is an element that has an entire
// Frame and FrameView, a <frame>, <iframe>, or <object>.
static bool isFrameElement(const Node *n)
{
    if (!n)
        return false;
    RenderObject *renderer = n->renderer();
    if (!renderer || !renderer->isWidget())
        return false;
    Widget* widget = static_cast<RenderWidget*>(renderer)->widget();
    return widget && widget->isFrameView();
}

void Frame::setFocusedNodeIfNeeded()
{
    if (selection()->isNone() || !selection()->isFocusedAndActive())
        return;

    Node* target = selection()->rootEditableElement();
    if (target) {
        RenderObject* renderer = target->renderer();

        // Walk up the render tree to search for a node to focus.
        // Walking up the DOM tree wouldn't work for shadow trees, like those behind the engine-based text fields.
        while (renderer) {
            // We don't want to set focus on a subframe when selecting in a parent frame,
            // so add the !isFrameElement check here. There's probably a better way to make this
            // work in the long term, but this is the safest fix at this time.
            if (target && target->isMouseFocusable() && !isFrameElement(target)) {
                page()->focusController()->setFocusedNode(target, this);
                return;
            }
            renderer = renderer->parent();
            if (renderer)
                target = renderer->node();
        }
        document()->setFocusedNode(0);
    }
}

void Frame::selectionLayoutChanged()
{
    bool caretRectChanged = selection()->recomputeCaretRect();

#if ENABLE(TEXT_CARET)
    bool shouldBlink = m_caretVisible
        && selection()->isCaret() && selection()->isContentEditable();

    // If the caret moved, stop the blink timer so we can restart with a
    // black caret in the new location.
    if (caretRectChanged || !shouldBlink)
        m_caretBlinkTimer.stop();

    // Start blinking with a black caret. Be sure not to restart if we're
    // already blinking in the right location.
    if (shouldBlink && !m_caretBlinkTimer.isActive()) {
        if (double blinkInterval = theme()->caretBlinkInterval())
            m_caretBlinkTimer.startRepeating(blinkInterval);

        if (!m_caretPaint) {
            m_caretPaint = true;
            selection()->invalidateCaretRect();
        }
    }
#else
    if (!caretRectChanged)
        return;
#endif

    RenderView* view = contentRenderer();
    if (!view)
        return;

    VisibleSelection selection = this->selection()->selection();
        
    if (!selection.isRange())
        view->clearSelection();
    else {
        // Use the rightmost candidate for the start of the selection, and the leftmost candidate for the end of the selection.
        // Example: foo <a>bar</a>.  Imagine that a line wrap occurs after 'foo', and that 'bar' is selected.   If we pass [foo, 3]
        // as the start of the selection, the selection painting code will think that content on the line containing 'foo' is selected
        // and will fill the gap before 'bar'.
        Position startPos = selection.start();
        if (startPos.downstream().isCandidate())
            startPos = startPos.downstream();
        Position endPos = selection.end();
        if (endPos.upstream().isCandidate())
            endPos = endPos.upstream();
        
        // We can get into a state where the selection endpoints map to the same VisiblePosition when a selection is deleted
        // because we don't yet notify the SelectionController of text removal.
        if (startPos.isNotNull() && endPos.isNotNull() && selection.visibleStart() != selection.visibleEnd()) {
            RenderObject *startRenderer = startPos.node()->renderer();
            RenderObject *endRenderer = endPos.node()->renderer();
            view->setSelection(startRenderer, startPos.offset(), endRenderer, endPos.offset());
        }
    }
}

void Frame::caretBlinkTimerFired(Timer<Frame>*)
{
#if ENABLE(TEXT_CARET)
    ASSERT(m_caretVisible);
    ASSERT(selection()->isCaret());
    bool caretPaint = m_caretPaint;
    if (selection()->isCaretBlinkingSuspended() && caretPaint)
        return;
    m_caretPaint = !caretPaint;
    selection()->invalidateCaretRect();
#endif
}

void Frame::paintCaret(GraphicsContext* p, int tx, int ty, const IntRect& clipRect) const
{
#if ENABLE(TEXT_CARET)
    if (m_caretPaint && m_caretVisible)
        selection()->paintCaret(p, tx, ty, clipRect);
#endif
}

void Frame::paintDragCaret(GraphicsContext* p, int tx, int ty, const IntRect& clipRect) const
{
#if ENABLE(TEXT_CARET)
    SelectionController* dragCaretController = m_page->dragCaretController();
    ASSERT(dragCaretController->selection().isCaret());
    if (dragCaretController->selection().start().node()->document()->frame() == this)
        dragCaretController->paintCaret(p, tx, ty, clipRect);
#endif
}

float Frame::zoomFactor() const
{
    return m_zoomFactor;
}

bool Frame::isZoomFactorTextOnly() const
{
    return m_page->settings()->zoomsTextOnly();
}

bool Frame::shouldApplyTextZoom() const
{
    if (m_zoomFactor == 1.0f || !isZoomFactorTextOnly())
        return false;
#if ENABLE(SVG)
    if (m_doc->isSVGDocument())
        return false;
#endif
    return true;
}

bool Frame::shouldApplyPageZoom() const
{
    if (m_zoomFactor == 1.0f || isZoomFactorTextOnly())
        return false;
#if ENABLE(SVG)
    if (m_doc->isSVGDocument())
        return false;
#endif
    return true;
}

void Frame::setZoomFactor(float percent, bool isTextOnly)
{  
    if (m_zoomFactor == percent && isZoomFactorTextOnly() == isTextOnly)
        return;

#if ENABLE(SVG)
    // SVG doesn't care if the zoom factor is text only.  It will always apply a 
    // zoom to the whole SVG.
    if (m_doc->isSVGDocument()) {
        if (!static_cast<SVGDocument*>(m_doc.get())->zoomAndPanEnabled())
            return;
        m_zoomFactor = percent;
        m_page->settings()->setZoomsTextOnly(true); // We do this to avoid doing any scaling of CSS pixels, since the SVG has its own notion of zoom.
        if (m_doc->renderer())
            m_doc->renderer()->repaint();
        return;
    }
#endif

    m_zoomFactor = percent;
    m_page->settings()->setZoomsTextOnly(isTextOnly);

    m_doc->recalcStyle(Node::Force);

    for (Frame* child = tree()->firstChild(); child; child = child->tree()->nextSibling())
        child->setZoomFactor(m_zoomFactor, isTextOnly);

    if (m_doc->renderer() && m_doc->renderer()->needsLayout() && view()->didFirstLayout())
        view()->layout();
}

void Frame::setPrinting(bool printing, float minPageWidth, float maxPageWidth, bool adjustViewSize)
{
    m_doc->setPrinting(printing);
    view()->setMediaType(printing ? "print" : "screen");
    m_doc->updateStyleSelector();
    view()->forceLayoutWithPageWidthRange(minPageWidth, maxPageWidth, adjustViewSize);

    for (Frame* child = tree()->firstChild(); child; child = child->tree()->nextSibling())
        child->setPrinting(printing, minPageWidth, maxPageWidth, adjustViewSize);
}

void Frame::setJSStatusBarText(const String& text)
{
    m_kjsStatusBarText = text;
    if (m_page)
        m_page->chrome()->setStatusbarText(this, m_kjsStatusBarText);
}

void Frame::setJSDefaultStatusBarText(const String& text)
{
    m_kjsDefaultStatusBarText = text;
    if (m_page)
        m_page->chrome()->setStatusbarText(this, m_kjsDefaultStatusBarText);
}

String Frame::jsStatusBarText() const
{
    return m_kjsStatusBarText;
}

String Frame::jsDefaultStatusBarText() const
{
   return m_kjsDefaultStatusBarText;
}

void Frame::setNeedsReapplyStyles()
{
    if (m_needsReapplyStyles)
        return;

    m_needsReapplyStyles = true;

    // FrameView's "layout" timer includes reapplyStyles, so despite its
    // name, it's what we want to call here.
    if (view())
        view()->scheduleRelayout();
}

bool Frame::needsReapplyStyles() const
{
    return m_needsReapplyStyles;
}

void Frame::reapplyStyles()
{
    m_needsReapplyStyles = false;

    // FIXME: This call doesn't really make sense in a method called
    // "reapplyStyles". We should probably eventually move it into its own
    // method.
    m_doc->docLoader()->setAutoLoadImages(m_page && m_page->settings()->loadsImagesAutomatically());
        
#if FRAME_LOADS_USER_STYLESHEET
    const KURL userStyleSheetLocation = m_page ? m_page->settings()->userStyleSheetLocation() : KURL();
    if (!userStyleSheetLocation.isEmpty())
        setUserStyleSheetLocation(userStyleSheetLocation);
    else
        setUserStyleSheet(String());
#endif

    // FIXME: It's not entirely clear why the following is needed.
    // The document automatically does this as required when you set the style sheet.
    // But we had problems when this code was removed. Details are in
    // <http://bugs.webkit.org/show_bug.cgi?id=8079>.
    m_doc->updateStyleSelector();
}

bool Frame::shouldChangeSelection(const VisibleSelection& newSelection) const
{
    return shouldChangeSelection(selection()->selection(), newSelection, newSelection.affinity(), false);
}

bool Frame::shouldChangeSelection(const VisibleSelection& oldSelection, const VisibleSelection& newSelection, EAffinity affinity, bool stillSelecting) const
{
    return editor()->client()->shouldChangeSelectedRange(oldSelection.toNormalizedRange().get(), newSelection.toNormalizedRange().get(),
                                                         affinity, stillSelecting);
}

bool Frame::shouldDeleteSelection(const VisibleSelection& selection) const
{
    return editor()->client()->shouldDeleteRange(selection.toNormalizedRange().get());
}

bool Frame::isContentEditable() const 
{
    if (m_editor.clientIsEditable())
        return true;
    return m_doc->inDesignMode();
}

#if !PLATFORM(MAC)

void Frame::setUseSecureKeyboardEntry(bool)
{
}

#endif

void Frame::updateSecureKeyboardEntryIfActive()
{
    if (selection()->isFocusedAndActive())
        setUseSecureKeyboardEntry(m_doc->useSecureKeyboardEntryWhenActive());
}

CSSMutableStyleDeclaration *Frame::typingStyle() const
{
    return m_typingStyle.get();
}

void Frame::setTypingStyle(CSSMutableStyleDeclaration *style)
{
    m_typingStyle = style;
}

void Frame::clearTypingStyle()
{
    m_typingStyle = 0;
}

void Frame::computeAndSetTypingStyle(CSSStyleDeclaration *style, EditAction editingAction)
{
    if (!style || style->length() == 0) {
        clearTypingStyle();
        return;
    }

    // Calculate the current typing style.
    RefPtr<CSSMutableStyleDeclaration> mutableStyle = style->makeMutable();
    if (typingStyle()) {
        typingStyle()->merge(mutableStyle.get());
        mutableStyle = typingStyle();
    }