Frame.cpp

/*
 * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
 *                     1999 Lars Knoll <knoll@kde.org>
 *                     1999 Antti Koivisto <koivisto@kde.org>
 *                     2000 Simon Hausmann <hausmann@kde.org>
 *                     2000 Stefan Schimanski <1Stein@gmx.de>
 *                     2001 George Staikos <staikos@kde.org>
 * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
 * Copyright (C) 2005 Alexey Proskuryakov <ap@nypop.com>
 * Copyright (C) 2007 Trolltech ASA
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#include "config.h"
#include "Frame.h"
#include "FramePrivate.h"

#include "ApplyStyleCommand.h"
#include "BeforeUnloadEvent.h"
#include "CSSComputedStyleDeclaration.h"
#include "CSSProperty.h"
#include "CSSPropertyNames.h"
#include "CachedCSSStyleSheet.h"
#include "DOMWindow.h"
#include "DocLoader.h"
#include "DocumentType.h"
#include "EditingText.h"
#include "EditorClient.h"
#include "EventNames.h"
#include "FocusController.h"
#include "FrameLoader.h"
#include "FrameView.h"
#include "GraphicsContext.h"
#include "HitTestResult.h"
#include "HTMLDocument.h"
#include "HTMLFormElement.h"
#include "HTMLFrameElementBase.h"
#include "HTMLGenericFormElement.h"
#include "HTMLNames.h"
#include "HTMLTableCellElement.h"
#include "Logging.h"
#include "MediaFeatureNames.h"
#include "NodeList.h"
#include "Page.h"
#include "RegularExpression.h"
#include "RenderPart.h"
#include "RenderTableCell.h"
#include "RenderTextControl.h"
#include "RenderTheme.h"
#include "RenderView.h"
#include "Settings.h"
#include "SystemTime.h"
#include "TextIterator.h"
#include "TextResourceDecoder.h"
#include "XMLNames.h"
#include "bindings/NP_jsobject.h"
#include "bindings/npruntime_impl.h"
#include "bindings/runtime_root.h"
#include "kjs_proxy.h"
#include "kjs_window.h"
#include "visible_units.h"

#if ENABLE(SVG)
#include "SVGDocument.h"
#include "SVGDocumentExtensions.h"
#include "SVGNames.h"
#include "XLinkNames.h"
#endif

using namespace std;

using KJS::JSLock;

namespace WebCore {

using namespace EventNames;
using namespace HTMLNames;

double Frame::s_currentPaintTimeStamp = 0.0;

class UserStyleSheetLoader : public CachedResourceClient {
public:
    UserStyleSheetLoader(PassRefPtr<Document> document, const String& url)
        : m_document(document)
        , m_cachedSheet(m_document->docLoader()->requestUserCSSStyleSheet(url, ""))
    {
        if (m_cachedSheet) {
            m_document->addPendingSheet();
            m_cachedSheet->ref(this);
        }
    }
    ~UserStyleSheetLoader()
    {
        if (m_cachedSheet) {
            if (!m_cachedSheet->isLoaded())
                m_document->removePendingSheet();        
            m_cachedSheet->deref(this);
        }
    }
private:
    virtual void setCSSStyleSheet(const String& /*URL*/, const String& /*charset*/, const String& sheet)
    {
        m_document->removePendingSheet();
        if (Frame* frame = m_document->frame())
            frame->setUserStyleSheet(sheet);
    }
    RefPtr<Document> m_document;
    CachedCSSStyleSheet* m_cachedSheet;
};

#ifndef NDEBUG
WTFLogChannel LogWebCoreFrameLeaks =  { 0x00000000, "", WTFLogChannelOn };

struct FrameCounter { 
    static int count; 
    ~FrameCounter() 
    { 
        if (count)
            LOG(WebCoreFrameLeaks, "LEAK: %d Frame\n", count);
    }
};
int FrameCounter::count = 0;
static FrameCounter frameCounter;
#endif

static inline Frame* parentFromOwnerElement(HTMLFrameOwnerElement* ownerElement)
{
    if (!ownerElement)
        return 0;
    return ownerElement->document()->frame();
}

Frame::Frame(Page* page, HTMLFrameOwnerElement* ownerElement, FrameLoaderClient* frameLoaderClient) 
    : d(new FramePrivate(page, parentFromOwnerElement(ownerElement), this, ownerElement, frameLoaderClient))
{
    AtomicString::init();
    EventNames::init();
    HTMLNames::init();
    QualifiedName::init();
    MediaFeatureNames::init();

#if ENABLE(SVG)
    SVGNames::init();
    XLinkNames::init();
#endif

    XMLNames::init();

    if (!ownerElement)
        page->setMainFrame(this);
    else {
        // FIXME: Frames were originally created with a refcount of 1.
        // Leave this ref call here until we can straighten that out.
        ref();
        page->incrementFrameCount();
        ownerElement->m_contentFrame = this;
    }

#ifndef NDEBUG
    ++FrameCounter::count;
#endif
}

Frame::~Frame()
{
    setView(0);
    loader()->clearRecordedFormValues();

#if PLATFORM(MAC)
    setBridge(0);
#endif
    
    loader()->cancelAndClear();
    
    // FIXME: We should not be doing all this work inside the destructor

    ASSERT(!d->m_lifeSupportTimer.isActive());

#ifndef NDEBUG
    --FrameCounter::count;
#endif

    if (d->m_jscript && d->m_jscript->haveInterpreter())
        static_cast<KJS::Window*>(d->m_jscript->globalObject())->disconnectFrame();

    disconnectOwnerElement();
    
    if (d->m_domWindow)
        d->m_domWindow->disconnectFrame();
            
    if (d->m_view) {
        d->m_view->hide();
        d->m_view->clearFrame();
    }
  
    ASSERT(!d->m_lifeSupportTimer.isActive());

    delete d->m_userStyleSheetLoader;
    delete d;
    d = 0;
}

void Frame::init()
{
    d->m_loader->init();
}

FrameLoader* Frame::loader() const
{
    return d->m_loader;
}

FrameView* Frame::view() const
{
    return d->m_view.get();
}

void Frame::setView(FrameView* view)
{
    // Detach the document now, so any onUnload handlers get run - if
    // we wait until the view is destroyed, then things won't be
    // hooked up enough for some JavaScript calls to work.
    if (!view && d->m_doc && d->m_doc->attached() && !d->m_doc->inPageCache()) {
        // FIXME: We don't call willRemove here. Why is that OK?
        d->m_doc->detach();
        if (d->m_view)
            d->m_view->unscheduleRelayout();
    }
    eventHandler()->clear();

    d->m_view = view;

    // Only one form submission is allowed per view of a part.
    // Since this part may be getting reused as a result of being
    // pulled from the back/forward cache, reset this flag.
    loader()->resetMultipleFormSubmissionProtection();
}

KJSProxy *Frame::scriptProxy()
{
    Settings* settings = this->settings();
    if (!settings || !settings->isJavaScriptEnabled())
        return 0;

    if (!d->m_jscript)
        d->m_jscript = new KJSProxy(this);

    return d->m_jscript;
}

Document *Frame::document() const
{
    if (d)
        return d->m_doc.get();
    return 0;
}

void Frame::setDocument(PassRefPtr<Document> newDoc)
{
    if (d->m_doc && d->m_doc->attached() && !d->m_doc->inPageCache()) {
        // FIXME: We don't call willRemove here. Why is that OK?
        d->m_doc->detach();
    }

    d->m_doc = newDoc;
    if (d->m_doc && d->m_isActive)
        setUseSecureKeyboardEntry(d->m_doc->useSecureKeyboardEntryWhenActive());
        
    if (d->m_doc && !d->m_doc->attached())
        d->m_doc->attach();
    
    // Remove the cached 'document' property, which is now stale.
    if (d->m_jscript)
        d->m_jscript->clearDocumentWrapper();
}

Settings* Frame::settings() const
{
    return d->m_page ? d->m_page->settings() : 0;
}

void Frame::setUserStyleSheetLocation(const KURL& url)
{
    delete d->m_userStyleSheetLoader;
    d->m_userStyleSheetLoader = 0;
    if (d->m_doc && d->m_doc->docLoader())
        d->m_userStyleSheetLoader = new UserStyleSheetLoader(d->m_doc, url.url());
}

void Frame::setUserStyleSheet(const String& styleSheet)
{
    delete d->m_userStyleSheetLoader;
    d->m_userStyleSheetLoader = 0;
    if (d->m_doc)
        d->m_doc->setUserStyleSheet(styleSheet);
}

String Frame::selectedText() const
{
    return plainText(selectionController()->toRange().get());
}

IntRect Frame::firstRectForRange(Range* range) const
{
    int extraWidthToEndOfLine = 0;
    ExceptionCode ec = 0;
    ASSERT(range->startContainer(ec));
    ASSERT(range->endContainer(ec));
    IntRect startCaretRect = range->startContainer(ec)->renderer()->caretRect(range->startOffset(ec), DOWNSTREAM, &extraWidthToEndOfLine);
    ASSERT(!ec);
    IntRect endCaretRect = range->endContainer(ec)->renderer()->caretRect(range->endOffset(ec), UPSTREAM);
    ASSERT(!ec);
    
    if (startCaretRect.y() == endCaretRect.y()) {
        // start and end are on the same line
        return IntRect(min(startCaretRect.x(), endCaretRect.x()), 
                       startCaretRect.y(), 
                       abs(endCaretRect.x() - startCaretRect.x()),
                       max(startCaretRect.height(), endCaretRect.height()));
    }
    
    // start and end aren't on the same line, so go from start to the end of its line
    return IntRect(startCaretRect.x(), 
                   startCaretRect.y(),
                   startCaretRect.width() + extraWidthToEndOfLine,
                   startCaretRect.height());
}

SelectionController* Frame::selectionController() const
{
    return &d->m_selectionController;
}

Editor* Frame::editor() const
{
    return &d->m_editor;
}

TextGranularity Frame::selectionGranularity() const
{
    return d->m_selectionGranularity;
}

void Frame::setSelectionGranularity(TextGranularity granularity) const
{
    d->m_selectionGranularity = granularity;
}

SelectionController* Frame::dragCaretController() const
{
    return d->m_page->dragCaretController();
}


AnimationController* Frame::animationController() const
{
    return &d->m_animationController;
}

// Either get cached regexp or build one that matches any of the labels.
// The regexp we build is of the form:  (STR1|STR2|STRN)
static RegularExpression *regExpForLabels(const Vector<String>& labels)
{
    // REVIEW- version of this call in FrameMac.mm caches based on the NSArray ptrs being
    // the same across calls.  We can't do that.

    static RegularExpression wordRegExp = RegularExpression("\\w");
    DeprecatedString pattern("(");
    unsigned int numLabels = labels.size();
    unsigned int i;
    for (i = 0; i < numLabels; i++) {
        DeprecatedString label = labels[i].deprecatedString();

        bool startsWithWordChar = false;
        bool endsWithWordChar = false;
        if (label.length() != 0) {
            startsWithWordChar = wordRegExp.search(label.at(0)) >= 0;
            endsWithWordChar = wordRegExp.search(label.at(label.length() - 1)) >= 0;
        }
        
        if (i != 0)
            pattern.append("|");
        // Search for word boundaries only if label starts/ends with "word characters".
        // If we always searched for word boundaries, this wouldn't work for languages
        // such as Japanese.
        if (startsWithWordChar) {
            pattern.append("\\b");
        }
        pattern.append(label);
        if (endsWithWordChar) {
            pattern.append("\\b");
        }
    }
    pattern.append(")");
    return new RegularExpression(pattern, false);
}

String Frame::searchForLabelsAboveCell(RegularExpression* regExp, HTMLTableCellElement* cell)
{
    RenderTableCell* cellRenderer = static_cast<RenderTableCell*>(cell->renderer());

    if (cellRenderer && cellRenderer->isTableCell()) {
        RenderTableCell* cellAboveRenderer = cellRenderer->table()->cellAbove(cellRenderer);

        if (cellAboveRenderer) {
            HTMLTableCellElement* aboveCell =
                static_cast<HTMLTableCellElement*>(cellAboveRenderer->element());

            if (aboveCell) {
                // search within the above cell we found for a match
                for (Node* n = aboveCell->firstChild(); n; n = n->traverseNextNode(aboveCell)) {
                    if (n->isTextNode() && n->renderer() && n->renderer()->style()->visibility() == VISIBLE) {
                        // For each text chunk, run the regexp
                        DeprecatedString nodeString = n->nodeValue().deprecatedString();
                        int pos = regExp->searchRev(nodeString);
                        if (pos >= 0)
                            return nodeString.mid(pos, regExp->matchedLength());
                    }
                }
            }
        }
    }
    // Any reason in practice to search all cells in that are above cell?
    return String();
}

String Frame::searchForLabelsBeforeElement(const Vector<String>& labels, Element* element)
{
    RegularExpression* regExp = regExpForLabels(labels);
    // We stop searching after we've seen this many chars
    const unsigned int charsSearchedThreshold = 500;
    // This is the absolute max we search.  We allow a little more slop than
    // charsSearchedThreshold, to make it more likely that we'll search whole nodes.
    const unsigned int maxCharsSearched = 600;
    // If the starting element is within a table, the cell that contains it
    HTMLTableCellElement* startingTableCell = 0;
    bool searchedCellAbove = false;

    // walk backwards in the node tree, until another element, or form, or end of tree
    int unsigned lengthSearched = 0;
    Node* n;
    for (n = element->traversePreviousNode();
         n && lengthSearched < charsSearchedThreshold;
         n = n->traversePreviousNode())
    {
        if (n->hasTagName(formTag)
            || (n->isHTMLElement()
                && static_cast<HTMLElement*>(n)->isGenericFormElement()))
        {
            // We hit another form element or the start of the form - bail out
            break;
        } else if (n->hasTagName(tdTag) && !startingTableCell) {
            startingTableCell = static_cast<HTMLTableCellElement*>(n);
        } else if (n->hasTagName(trTag) && startingTableCell) {
            String result = searchForLabelsAboveCell(regExp, 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
            DeprecatedString nodeString = n->nodeValue().deprecatedString();
            // 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.mid(pos, regExp->matchedLength());
            else
                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, startingTableCell);
    }
    return String();
}

String Frame::matchLabelsAgainstElement(const Vector<String>& labels, Element* element)
{
    DeprecatedString name = element->getAttribute(nameAttr).deprecatedString();
    // Make numbers and _'s in field names behave like word boundaries, e.g., "address2"
    name.replace(RegularExpression("\\d"), " ");
    name.replace('_', ' ');
    
    RegularExpression* regExp = regExpForLabels(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->search(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.mid(bestPos, bestLength);
    return String();
}

const Selection& Frame::mark() const
{
    return d->m_mark;
}

void Frame::setMark(const Selection& 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());

    d->m_mark = s;
}

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

    // If the current selection is in a textfield or textarea, notify the renderer that the selection has changed
    if (renderer && (renderer->isTextArea() || renderer->isTextField()))
        static_cast<RenderTextControl*>(renderer)->selectionChanged(userTriggered);
}

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

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

void Frame::clearCaretRectIfNeeded()
{
    if (d->m_caretPaint) {
        d->m_caretPaint = false;
        selectionController()->invalidateCaretRect();
    }
}

// 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 (!document() || selectionController()->isNone() || !d->m_isActive)
        return;

    Node* target = selectionController()->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->element();
        }
        document()->setFocusedNode(0);
    }
}

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

    bool shouldBlink = d->m_caretVisible
        && selectionController()->isCaret() && selectionController()->isContentEditable();

    // If the caret moved, stop the blink timer so we can restart with a
    // black caret in the new location.
    if (caretRectChanged || !shouldBlink)
        d->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 && !d->m_caretBlinkTimer.isActive()) {
        d->m_caretBlinkTimer.startRepeating(theme()->caretBlinkFrequency());
        if (!d->m_caretPaint) {
            d->m_caretPaint = true;
            selectionController()->invalidateCaretRect();
        }
    }

    if (!renderer())
        return;
    RenderView* canvas = static_cast<RenderView*>(renderer());

    Selection selection = selectionController()->selection();
        
    if (!selection.isRange())
        canvas->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.visibleStart().deepEquivalent();
        if (startPos.downstream().isCandidate())
            startPos = startPos.downstream();
        Position endPos = selection.visibleEnd().deepEquivalent();
        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();
            canvas->setSelection(startRenderer, startPos.offset(), endRenderer, endPos.offset());
        }
    }
}

void Frame::caretBlinkTimerFired(Timer<Frame>*)
{
    ASSERT(d->m_caretVisible);
    ASSERT(selectionController()->isCaret());
    bool caretPaint = d->m_caretPaint;
    if (selectionController()->isCaretBlinkingSuspended() && caretPaint)
        return;
    d->m_caretPaint = !caretPaint;
    selectionController()->invalidateCaretRect();
}

void Frame::paintCaret(GraphicsContext* p, const IntRect& rect) const
{
    if (d->m_caretPaint && d->m_caretVisible)
        selectionController()->paintCaret(p, rect);
}

void Frame::paintDragCaret(GraphicsContext* p, const IntRect& rect) const
{
    SelectionController* dragCaretController = d->m_page->dragCaretController();
    ASSERT(dragCaretController->selection().isCaret());
    if (dragCaretController->selection().start().node()->document()->frame() == this)
        dragCaretController->paintCaret(p, rect);
}

int Frame::zoomFactor() const
{
  return d->m_zoomFactor;
}

void Frame::setZoomFactor(int percent)
{  
  if (d->m_zoomFactor == percent)
      return;

#if ENABLE(SVG)
    if (d->m_doc && d->m_doc->isSVGDocument()) {
        if (!static_cast<SVGDocument*>(d->m_doc.get())->zoomAndPanEnabled())
            return;
        d->m_zoomFactor = percent;
        if (d->m_doc->renderer())
            d->m_doc->renderer()->repaint();
        return;
    }
#endif
  d->m_zoomFactor = percent;
  if (d->m_doc)
      d->m_doc->recalcStyle(Node::Force);

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

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

void Frame::setPrinting(bool printing, float minPageWidth, float maxPageWidth, bool adjustViewSize)
{
    if (!d->m_doc)
        return;

    d->m_doc->setPrinting(printing);
    view()->setMediaType(printing ? "print" : "screen");
    d->m_doc->updateStyleSelector();
    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)
{
    d->m_kjsStatusBarText = text;
    if (d->m_page)
        d->m_page->chrome()->setStatusbarText(this, d->m_kjsStatusBarText);
}

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

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

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

void Frame::setNeedsReapplyStyles()
{
    if (d->m_needsReapplyStyles)
        return;

    d->m_needsReapplyStyles = true;

    // Invalidate the FrameView so that FrameView::layout will get called,
    // which calls reapplyStyles.
    view()->invalidate();
}

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

void Frame::reapplyStyles()
{
    d->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.
    if (d->m_doc)
        d->m_doc->docLoader()->setAutoLoadImages(d->m_page && d->m_page->settings()->loadsImagesAutomatically());
        
    const KURL userStyleSheetLocation = d->m_page ? d->m_page->settings()->userStyleSheetLocation() : KURL();
    if (!userStyleSheetLocation.isEmpty())
        setUserStyleSheetLocation(userStyleSheetLocation);
    else
        setUserStyleSheet(String());

    // 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>.
    if (d->m_doc)
        d->m_doc->updateStyleSelector();
}

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

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

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

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

#if !PLATFORM(MAC)

void Frame::setUseSecureKeyboardEntry(bool)
{
}

#endif

void Frame::updateSecureKeyboardEntryIfActive()
{
    if (d->m_isActive)
        setUseSecureKeyboardEntry(d->m_doc->useSecureKeyboardEntryWhenActive());
}

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

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

void Frame::clearTypingStyle()
{
    d->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();
    }

    Node *node = selectionController()->selection().visibleStart().deepEquivalent().node();
    CSSComputedStyleDeclaration computedStyle(node);
    computedStyle.diff(mutableStyle.get());
    
    // Handle block styles, substracting these from the typing style.
    RefPtr<CSSMutableStyleDeclaration> blockStyle = mutableStyle->copyBlockProperties();
    blockStyle->diff(mutableStyle.get());
    if (document() && blockStyle->length() > 0)
        applyCommand(new ApplyStyleCommand(document(), blockStyle.get(), editingAction));
    
    // Set the remaining style as the typing style.
    d->m_typingStyle = mutableStyle.release();
}

static void updateState(CSSMutableStyleDeclaration *desiredStyle, CSSComputedStyleDeclaration *computedStyle, bool& atStart, Frame::TriState& state)
{
    DeprecatedValueListConstIterator<CSSProperty> end;
    for (DeprecatedValueListConstIterator<CSSProperty> it = desiredStyle->valuesIterator(); it != end; ++it) {
        int propertyID = (*it).id();
        String desiredProperty = desiredStyle->getPropertyValue(propertyID);
        String computedProperty = computedStyle->getPropertyValue(propertyID);
        Frame::TriState propertyState = equalIgnoringCase(desiredProperty, computedProperty)
            ? Frame::trueTriState : Frame::falseTriState;
        if (atStart) {
            state = propertyState;
            atStart = false;
        } else if (state != propertyState) {
            state = Frame::mixedTriState;
            break;
        }
    }
}

Frame::TriState Frame::selectionHasStyle(CSSStyleDeclaration *style) const
{
    bool atStart = true;
    TriState state = falseTriState;

    RefPtr<CSSMutableStyleDeclaration> mutableStyle = style->makeMutable();

    if (!selectionController()->isRange()) {
        Node* nodeToRemove;
        RefPtr<CSSComputedStyleDeclaration> selectionStyle = selectionComputedStyle(nodeToRemove);
        if (!selectionStyle)
            return falseTriState;
        updateState(mutableStyle.get(), selectionStyle.get(), atStart, state);
        if (nodeToRemove) {
            ExceptionCode ec = 0;
            nodeToRemove->remove(ec);
            ASSERT(ec == 0);
        }
    } else {
        for (Node* node = selectionController()->start().node(); node; node = node->traverseNextNode()) {
            RefPtr<CSSComputedStyleDeclaration> computedStyle = new CSSComputedStyleDeclaration(node);
            if (computedStyle)
                updateState(mutableStyle.get(), computedStyle.get(), atStart, state);
            if (state == mixedTriState)
                break;
            if (node == selectionController()->end().node())