/*
 * Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

#include "config.h"
#include "DOMWindow.h"

#include "BarInfo.h"
#include "CSSComputedStyleDeclaration.h"
#include "CSSRuleList.h"
#include "CSSStyleSelector.h"
#include "Chrome.h"
#include "Console.h"
#include "DOMSelection.h"
#include "Document.h"
#include "Element.h"
#include "FloatRect.h"
#include "Frame.h"
#include "FrameLoader.h"
#include "FrameTree.h"
#include "FrameView.h"
#include "History.h"
#include "MessageEvent.h"
#include "Page.h"
#include "PlatformScreen.h"
#include "PlatformString.h"
#include "Screen.h"
#include <algorithm>
#include <wtf/MathExtras.h>

#if ENABLE(DATABASE)
#include "Database.h"
#endif

using std::min;
using std::max;

#if USE(V8_BINDING)
#include "Location.h"
#include "Navigator.h"
#include "CString.h"
#include "FloatRect.h"
#include "FrameTree.h"
#include "FrameView.h"
#include "Page.h"
#include "Chrome.h"
#include "WindowFeatures.h"
#include "FrameLoadRequest.h"
#include "ScheduledAction.h"
#include "PausedTimeouts.h"
#include "v8_proxy.h"

#if PLATFORM(WIN)
#include <windows.h>
#endif // WIN

#include "JSBridge.h"
#include "CSSHelper.h"  // parseURL
#endif // V8_BINDING


namespace WebCore {

// This function:
// 1) Validates the pending changes are not changing to NaN
// 2) Constrains the window rect to no smaller than 100 in each dimension and no
//    bigger than the the float rect's dimensions.
// 3) Constrain window rect to within the top and left boundaries of the screen rect
// 4) Constraint the window rect to within the bottom and right boundaries of the
//    screen rect.
// 5) Translate the window rect coordinates to be within the coordinate space of
//    the screen rect.
void DOMWindow::adjustWindowRect(const FloatRect& screen, FloatRect& window, const FloatRect& pendingChanges)
{
    // Make sure we're in a valid state before adjusting dimensions.
    ASSERT(isfinite(screen.x()));
    ASSERT(isfinite(screen.y()));
    ASSERT(isfinite(screen.width()));
    ASSERT(isfinite(screen.height()));
    ASSERT(isfinite(window.x()));
    ASSERT(isfinite(window.y()));
    ASSERT(isfinite(window.width()));
    ASSERT(isfinite(window.height()));
    
    // Update window values if new requested values are not NaN.
    if (!isnan(pendingChanges.x()))
        window.setX(pendingChanges.x());
    if (!isnan(pendingChanges.y()))
        window.setY(pendingChanges.y());
    if (!isnan(pendingChanges.width()))
        window.setWidth(pendingChanges.width());
    if (!isnan(pendingChanges.height()))
        window.setHeight(pendingChanges.height());
    
    // Resize the window to between 100 and the screen width and height.
    window.setWidth(min(max(100.0f, window.width()), screen.width()));
    window.setHeight(min(max(100.0f, window.height()), screen.height()));
    
    // Constrain the window position to the screen.
    window.setX(max(screen.x(), min(window.x(), screen.right() - window.width())));
    window.setY(max(screen.y(), min(window.y(), screen.bottom() - window.height())));
}

#if USE(V8_BINDING)

static int lastUsedTimeoutId;
static int timerNestingLevel = 0;
const int kMaxTimerNestingLevel = 5;
const double kMinimumTimerInterval = 0.001;  // Change this to speed up Javascript's setTimeout!

class DOMWindowTimer : public TimerBase {
public:
    DOMWindowTimer(int timeoutId, int nestingLevel,
                   DOMWindow* o, ScheduledAction* a)
        : m_timeoutId(timeoutId), m_nestingLevel(nestingLevel),
          m_object(o), m_action(a) { }

    virtual ~DOMWindowTimer() { delete m_action; }

    int timeoutId() const { return m_timeoutId; }
    
    int nestingLevel() const { return m_nestingLevel; }
    void setNestingLevel(int n) { m_nestingLevel = n; }
    
    ScheduledAction* action() const { return m_action; }
    ScheduledAction* takeAction() { ScheduledAction* a = m_action; m_action = 0; return a; }

private:
    virtual void fired();

    int m_timeoutId;
    int m_nestingLevel;
    DOMWindow* m_object;
    ScheduledAction* m_action;
};

void DOMWindowTimer::fired() {
    timerNestingLevel = m_nestingLevel;
    m_object->timerFired(this);
    timerNestingLevel = 0;
}

#endif  // V8_BINDING


DOMWindow::DOMWindow(Frame* frame)
    : m_frame(frame)
{
}

DOMWindow::~DOMWindow()
{
}

void DOMWindow::disconnectFrame()
{
    m_frame = 0;
    clear();
}

void DOMWindow::clear()
{
    if (m_screen)
        m_screen->disconnectFrame();
    m_screen = 0;

    if (m_selection)
        m_selection->disconnectFrame();
    m_selection = 0;

    if (m_history)
        m_history->disconnectFrame();
    m_history = 0;

    if (m_locationbar)
        m_locationbar->disconnectFrame();
    m_locationbar = 0;

    if (m_menubar)
        m_menubar->disconnectFrame();
    m_menubar = 0;

    if (m_personalbar)
        m_personalbar->disconnectFrame();
    m_personalbar = 0;

    if (m_scrollbars)
        m_scrollbars->disconnectFrame();
    m_scrollbars = 0;

    if (m_statusbar)
        m_statusbar->disconnectFrame();
    m_statusbar = 0;

    if (m_toolbar)
        m_toolbar->disconnectFrame();
    m_toolbar = 0;

    if (m_console)
        m_console->disconnectFrame();
    m_console = 0;

#if USE(V8_BINDING)
    if (m_location)
        m_location->disconnectFrame();
    m_location = 0;

    if (m_navigator)
        m_navigator->disconnectFrame();
    m_navigator = 0;
#endif
}

Screen* DOMWindow::screen() const
{
    if (!m_screen)
        m_screen = new Screen(m_frame);
    return m_screen.get();
}

History* DOMWindow::history() const
{
    if (!m_history)
        m_history = new History(m_frame);
    return m_history.get();
}

BarInfo* DOMWindow::locationbar() const
{
    if (!m_locationbar)
        m_locationbar = new BarInfo(m_frame, BarInfo::Locationbar);
    return m_locationbar.get();
}

BarInfo* DOMWindow::menubar() const
{
    if (!m_menubar)
        m_menubar = new BarInfo(m_frame, BarInfo::Menubar);
    return m_menubar.get();
}

BarInfo* DOMWindow::personalbar() const
{
    if (!m_personalbar)
        m_personalbar = new BarInfo(m_frame, BarInfo::Personalbar);
    return m_personalbar.get();
}

BarInfo* DOMWindow::scrollbars() const
{
    if (!m_scrollbars)
        m_scrollbars = new BarInfo(m_frame, BarInfo::Scrollbars);
    return m_scrollbars.get();
}

BarInfo* DOMWindow::statusbar() const
{
    if (!m_statusbar)
        m_statusbar = new BarInfo(m_frame, BarInfo::Statusbar);
    return m_statusbar.get();
}

BarInfo* DOMWindow::toolbar() const
{
    if (!m_toolbar)
        m_toolbar = new BarInfo(m_frame, BarInfo::Toolbar);
    return m_toolbar.get();
}

Console* DOMWindow::console() const
{
    if (!m_console)
        m_console = new Console(m_frame);
    return m_console.get();
}

#if ENABLE(CROSS_DOCUMENT_MESSAGING)
void DOMWindow::postMessage(const String& message, const String& domain, const String& uri, DOMWindow* source) const
{
   ExceptionCode ec;
   document()->dispatchEvent(new MessageEvent(message, domain, uri, source), ec, true);
}
#endif

DOMSelection* DOMWindow::getSelection()
{
    if (!m_selection)
        m_selection = new DOMSelection(m_frame);
    return m_selection.get();
}

Element* DOMWindow::frameElement() const
{
    if (!m_frame)
        return 0;

    Document* doc = m_frame->document();
    ASSERT(doc);
    if (!doc)
        return 0;

    // FIXME: could this use m_frame->ownerElement() instead of going through the Document.
    return doc->ownerElement();
}

void DOMWindow::focus()
{
    if (!m_frame)
        return;

    m_frame->focusWindow();
}

void DOMWindow::blur()
{
    if (!m_frame)
        return;

    m_frame->unfocusWindow();
}

void DOMWindow::close()
{
    if (!m_frame)
        return;

    if (m_frame->loader()->openedByDOM() || m_frame->loader()->getHistoryLength() <= 1)
        m_frame->scheduleClose();
}

void DOMWindow::print()
{
    if (!m_frame)
        return;

    Page* page = m_frame->page();
    if (!page)
        return;

    page->chrome()->print(m_frame);
}

void DOMWindow::stop()
{
    if (!m_frame)
        return;

    // Ignores stop() in unload event handlers
    if (m_frame->loader()->firingUnloadEvents())
        return;

    // We must check whether the load is complete asynchronously,
    // because we might still be parsing the document until the
    // callstack unwinds.
    m_frame->loader()->stopForUserCancel(true);
}

void DOMWindow::alert(const String& message)
{
#if USE(V8_BINDING)
    // Before showing the JavaScript dialog, we give
    // the proxy implementation a chance to process any
    // pending console messages.
    V8Proxy::ProcessConsoleMessages();
#endif

    if (!m_frame)
        return;

    Document* doc = m_frame->document();
    ASSERT(doc);
    if (doc)
        doc->updateRendering();

    Page* page = m_frame->page();
    if (!page)
        return;

    page->chrome()->runJavaScriptAlert(m_frame, message);
}

bool DOMWindow::confirm(const String& message)
{
#if USE(V8_BINDING)
    // Before showing the JavaScript dialog, we give
    // the proxy implementation a chance to process any
    // pending console messages.
    V8Proxy::ProcessConsoleMessages();
#endif

    if (!m_frame)
        return false;

    Document* doc = m_frame->document();
    ASSERT(doc);
    if (doc)
        doc->updateRendering();

    Page* page = m_frame->page();
    if (!page)
        return false;

    return page->chrome()->runJavaScriptConfirm(m_frame, message);
}

String DOMWindow::prompt(const String& message, const String& defaultValue)
{
#if USE(V8_BINDING)
    // Before showing the JavaScript dialog, we give
    // the proxy implementation a chance to process any
    // pending console messages.
    V8Proxy::ProcessConsoleMessages();
#endif

    if (!m_frame)
        return String();

    Document* doc = m_frame->document();
    ASSERT(doc);
    if (doc)
        doc->updateRendering();

    Page* page = m_frame->page();
    if (!page)
        return String();

    String returnValue;
    if (page->chrome()->runJavaScriptPrompt(m_frame, message, defaultValue, returnValue))
        return returnValue;

    return String();
}

bool DOMWindow::find(const String& string, bool caseSensitive, bool backwards, bool wrap, bool wholeWord, bool searchInFrames, bool showDialog) const
{
    if (!m_frame)
        return false;

    // FIXME (13016): Support wholeWord, searchInFrames and showDialog
    return m_frame->findString(string, !backwards, caseSensitive, wrap, false);
}

bool DOMWindow::offscreenBuffering() const
{
    return true;
}

int DOMWindow::outerHeight() const
{
    if (!m_frame)
        return 0;

    Page* page = m_frame->page();
    if (!page)
        return 0;

    return static_cast<int>(page->chrome()->windowRect().height());
}

int DOMWindow::outerWidth() const
{
    if (!m_frame)
        return 0;

    Page* page = m_frame->page();
    if (!page)
        return 0;

    return static_cast<int>(page->chrome()->windowRect().width());
}

int DOMWindow::innerHeight() const
{
    if (!m_frame)
        return 0;

    FrameView* view = m_frame->view();
    if (!view)
        return 0;

    return view->height();
}

int DOMWindow::innerWidth() const
{
    if (!m_frame)
        return 0;

    FrameView* view = m_frame->view();
    if (!view)
        return 0;

    return view->width();
}

int DOMWindow::screenX() const
{
    if (!m_frame)
        return 0;

    Page* page = m_frame->page();
    if (!page)
        return 0;

    return static_cast<int>(page->chrome()->windowRect().x());
}

int DOMWindow::screenY() const
{
    if (!m_frame)
        return 0;

    Page* page = m_frame->page();
    if (!page)
        return 0;

    return static_cast<int>(page->chrome()->windowRect().y());
}

int DOMWindow::scrollX() const
{
    if (!m_frame)
        return 0;

    FrameView* view = m_frame->view();
    if (!view)
        return 0;

    Document* doc = m_frame->document();
    ASSERT(doc);
    if (doc)
        doc->updateLayoutIgnorePendingStylesheets();

    return view->contentsX();
}

int DOMWindow::scrollY() const
{
    if (!m_frame)
        return 0;

    FrameView* view = m_frame->view();
    if (!view)
        return 0;

    Document* doc = m_frame->document();
    ASSERT(doc);
    if (doc)
        doc->updateLayoutIgnorePendingStylesheets();

    return view->contentsY();
}

bool DOMWindow::closed() const
{
    return !m_frame;
}

unsigned DOMWindow::length() const
{
    if (!m_frame)
        return 0;

    return m_frame->tree()->childCount();
}

String DOMWindow::name() const
{
    if (!m_frame)
        return String();

    return m_frame->tree()->name();
}

void DOMWindow::setName(const String& string)
{
    if (!m_frame)
        return;

    m_frame->tree()->setName(string);
}

String DOMWindow::status() const
{
    if (!m_frame)
        return String();

    return m_frame->jsStatusBarText();
}

void DOMWindow::setStatus(const String& string) 
{ 
    if (!m_frame) 
        return; 

    m_frame->setJSStatusBarText(string); 
} 
    
String DOMWindow::defaultStatus() const
{
    if (!m_frame)
        return String();

    return m_frame->jsDefaultStatusBarText();
} 

void DOMWindow::setDefaultStatus(const String& string) 
{ 
    if (!m_frame) 
        return; 

    m_frame->setJSDefaultStatusBarText(string);
}

DOMWindow* DOMWindow::self() const
{
    if (!m_frame)
        return 0;

    return m_frame->domWindow();
}

DOMWindow* DOMWindow::opener() const
{
    if (!m_frame)
        return 0;

    Frame* opener = m_frame->loader()->opener();
    if (!opener)
        return 0;

    return opener->domWindow();
}

DOMWindow* DOMWindow::parent() const
{
    if (!m_frame)
        return 0;

    Frame* parent = m_frame->tree()->parent();
    if (parent)
        return parent->domWindow();

    return m_frame->domWindow();
}

DOMWindow* DOMWindow::top() const
{
    if (!m_frame)
        return 0;

    Page* page = m_frame->page();
    if (!page)
        return 0;

    return page->mainFrame()->domWindow();
}

Document* DOMWindow::document() const
{
    if (!m_frame)
        return 0;

    ASSERT(m_frame->document());
    return m_frame->document();
}

PassRefPtr<CSSStyleDeclaration> DOMWindow::getComputedStyle(Element* elt, const String&) const
{
    if (!elt)
        return 0;

    // FIXME: This needs to work with pseudo elements.
    return new CSSComputedStyleDeclaration(elt);
}

PassRefPtr<CSSRuleList> DOMWindow::getMatchedCSSRules(Element* elt, const String& pseudoElt, bool authorOnly) const
{
    if (!m_frame)
        return 0;

    Document* doc = m_frame->document();
    ASSERT(doc);
    if (!doc)
        return 0;

    if (!pseudoElt.isEmpty())
        return doc->styleSelector()->pseudoStyleRulesForElement(elt, pseudoElt.impl(), authorOnly);
    return doc->styleSelector()->styleRulesForElement(elt, authorOnly);
}

double DOMWindow::devicePixelRatio() const
{
    if (!m_frame)
        return 0.0;

    Page* page = m_frame->page();
    if (!page)
        return 0.0;

    return page->chrome()->scaleFactor();
}

#if USE(V8_BINDING)

static void setWindowFeature(const String& keyString, const String& valueString, WindowFeatures& windowFeatures) {
  int value;
  
  if (valueString.length() == 0 || // listing a key with no value is shorthand for key=yes
      valueString == "yes")
    value = 1;
  else
    value = valueString.toInt();
  
  if (keyString == "left" || keyString == "screenx") {
    windowFeatures.xSet = true;
    windowFeatures.x = value;
  } else if (keyString == "top" || keyString == "screeny") {
    windowFeatures.ySet = true;
    windowFeatures.y = value;
  } else if (keyString == "width" || keyString == "innerwidth") {
    windowFeatures.widthSet = true;
    windowFeatures.width = value;
  } else if (keyString == "height" || keyString == "innerheight") {
    windowFeatures.heightSet = true;
    windowFeatures.height = value;
  } else if (keyString == "menubar")
    windowFeatures.menuBarVisible = value;
  else if (keyString == "toolbar")
    windowFeatures.toolBarVisible = value;
  else if (keyString == "location")
    windowFeatures.locationBarVisible = value;
  else if (keyString == "status")
    windowFeatures.statusBarVisible = value;
  else if (keyString == "resizable")
    windowFeatures.resizable = value;
  else if (keyString == "fullscreen")
    windowFeatures.fullscreen = value;
  else if (keyString == "scrollbars")
    windowFeatures.scrollbarsVisible = value;
}


void DOMWindow::back() {
    if (m_history) m_history->back();
}

void DOMWindow::forward() {
    if (m_history) m_history->forward();
}

Location* DOMWindow::location() {
  if (!m_location) {
    m_location = new Location(m_frame);
  }
  return m_location.get();
}

void DOMWindow::setLocation(const String& v) {
  if (!m_frame)
    return;

  Frame* active_frame = JSBridge::retrieveActiveFrame();
  if (!active_frame)
    return;

  if (!active_frame->loader()->shouldAllowNavigation(m_frame))
    return;

  if (!parseURL(v).startsWith("javascript:", false) ||
    JSBridge::isSafeScript(m_frame)) {
    String completed_url = active_frame->loader()->completeURL(v).string();

    m_frame->loader()->scheduleLocationChange(completed_url,
        active_frame->loader()->outgoingReferrer(), false,
        active_frame->scriptBridge()->wasRunByUserGesture());
  }
}

Navigator* DOMWindow::navigator() {
  if (!m_navigator) {
    m_navigator = new Navigator(m_frame);
  }
  return m_navigator.get();
}

void DOMWindow::dump(const String& msg) {
  if (!m_frame || !m_frame->page()) return;

  m_frame->page()->chrome()->addMessageToConsole(JSMessageSource,
    ErrorMessageLevel, msg, 0, m_frame->document()->url());
}

void DOMWindow::scheduleClose() {
  if (!m_frame) return;

  m_frame->scheduleClose();
}

void DOMWindow::timerFired(DOMWindowTimer* timer) {
  if (!m_frame) return;

  // Simple case for non-one-shot timers.
  if (timer->isActive()) {
    int timeoutId = timer->timeoutId();
    
    timer->action()->execute(this);
    return;
  }
  
  // Delete timer before executing the action for one-shot timers.
  ScheduledAction* action = timer->takeAction();
  m_timeouts.remove(timer->timeoutId());
  delete timer;
  action->execute(this);
  delete action;
}


void DOMWindow::clearAllTimeouts() {
  deleteAllValues(m_timeouts);
  m_timeouts.clear();
}


int DOMWindow::installTimeout(ScheduledAction* a, int t, bool singleShot) {
  if (!m_frame)
    return 0;

  int timeoutId = ++lastUsedTimeoutId;

  // avoid wraparound going negative on us
  if (timeoutId <= 0)
    timeoutId = 1;

  int nestLevel = timerNestingLevel + 1;

  DOMWindowTimer* timer = new DOMWindowTimer(timeoutId, nestLevel, this, a);
  ASSERT(!m_timeouts.get(timeoutId));
  m_timeouts.set(timeoutId, timer);
  double interval = max(kMinimumTimerInterval, t * 0.001);
  if (singleShot)
    timer->startOneShot(interval);
  else
    timer->startRepeating(interval);
  
  return timeoutId;
}

void DOMWindow::clearTimeout(int timeoutId) {
  // timeout IDs have to be positive, and 0 and -1 are unsafe to
  // even look up since they are the empty and deleted value
  // respectively
  if (timeoutId <= 0)
    return;

  delete m_timeouts.take(timeoutId);
}

PausedTimeouts* DOMWindow::pauseTimeouts() {
    size_t count = m_timeouts.size();
    if (count == 0) return 0;

    PausedTimeout* t = new PausedTimeout[count];
    PausedTimeouts* result = new PausedTimeouts(t, count);

    TimeoutsMap::iterator it = m_timeouts.begin();
    for (size_t i = 0; i != count; ++i, ++it) {
        int timeoutId = it->first;
        DOMWindowTimer* timer = it->second;
        t[i].timeoutId = timeoutId;
        t[i].nestingLevel = timer->nestingLevel();
        t[i].nextFireInterval = timer->nextFireInterval();
        t[i].repeatInterval = timer->repeatInterval();
        t[i].action = timer->takeAction();
    }
    ASSERT(it == m_timeouts.end());

    deleteAllValues(m_timeouts);
    m_timeouts.clear();

    return result;
}

void DOMWindow::resumeTimeouts(PausedTimeouts* timeouts) {
    if (!timeouts) return;
    size_t count = timeouts->numTimeouts();
    PausedTimeout* array = timeouts->takeTimeouts();
    for (size_t i = 0; i != count; ++i) {
        int timeoutId = array[i].timeoutId;
        DOMWindowTimer* timer = 
          new DOMWindowTimer(timeoutId, array[i].nestingLevel,
                             this, array[i].action);
        m_timeouts.set(timeoutId, timer);
        timer->start(array[i].nextFireInterval, array[i].repeatInterval);
    }
    delete[] array;
}

#endif  // V8_BINDING

void DOMWindow::updateLayout() const {
  WebCore::Document* docimpl = m_frame->document();
  if (docimpl)
    docimpl->updateLayoutIgnorePendingStylesheets();
}

void DOMWindow::moveTo(float x, float y) const {
  if (!m_frame || !m_frame->page()) return;

  Page* page = m_frame->page();
  FloatRect fr = page->chrome()->windowRect();
  FloatRect sr = screenAvailableRect(page->mainFrame()->view());
  fr.setLocation(sr.location());
  FloatRect update = fr;
  update.move(x, y);
  // Security check (the spec talks about UniversalBrowserWrite to disable this check...)
  adjustWindowRect(sr, fr, update);
  page->chrome()->setWindowRect(fr);
}
 
void DOMWindow::moveBy(float x, float y) const {
  if (!m_frame || !m_frame->page()) return;
  
  Page* page = m_frame->page();
  FloatRect fr = page->chrome()->windowRect();
  FloatRect update = fr;
  update.move(x, y);
  // Security check (the spec talks about UniversalBrowserWrite to disable this check...)
  adjustWindowRect(screenAvailableRect(page->mainFrame()->view()), fr, update);
  page->chrome()->setWindowRect(fr);
}
 
void DOMWindow::resizeTo(float x, float y) const {
  if (!m_frame || !m_frame->page()) return;

  Page* page = m_frame->page();
  FloatRect fr = page->chrome()->windowRect();
  FloatSize dest = FloatSize(x, y);
  FloatRect update(fr.location(), dest);
  adjustWindowRect(screenAvailableRect(page->mainFrame()->view()), fr, update);
  page->chrome()->setWindowRect(fr);
}
 
void DOMWindow::resizeBy(float x, float y) const {
  if (!m_frame || !m_frame->page()) return;

  Page* page = m_frame->page();
  FloatRect fr = page->chrome()->windowRect();
  FloatSize dest = fr.size() + FloatSize(x, y);
  FloatRect update(fr.location(), dest);
  adjustWindowRect(screenAvailableRect(page->mainFrame()->view()), fr, update);
  page->chrome()->setWindowRect(fr);
}
 

void DOMWindow::scrollTo(int x, int y) const {
  if (!m_frame || !m_frame->view()) return;

  updateLayout();
  m_frame->view()->setContentsPos(x, y);
}

void DOMWindow::scrollBy(int x, int y) const {
  if (!m_frame || !m_frame->view()) return;

  updateLayout();
  m_frame->view()->scrollBy(x, y);
}

#if ENABLE(DATABASE)
PassRefPtr<Database> DOMWindow::openDatabase(const String& name, const String& version, const String& displayName, unsigned long estimatedSize, ExceptionCode& ec)
{
    if (!m_frame)
        return 0;

    Document* doc = m_frame->document();
    ASSERT(doc);
    if (!doc)
        return 0;

    return Database::openDatabase(doc, name, version, displayName, estimatedSize, ec);
}
#endif


} // namespace WebCore