diff -r 000000000000 -r 1450b09d0cfd ginebra/chromewidget.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ginebra/chromewidget.cpp	Tue May 04 12:39:35 2010 +0300
@@ -0,0 +1,767 @@
+/*
+* Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
+* All rights reserved.
+*
+* This program is free software: you can redistribute it and/or modify
+* it under the terms of the GNU Lesser General Public License as published by
+* the Free Software Foundation, version 2.1 of the License.
+* 
+* This program 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 Lesser General Public License for more details.
+*
+* You should have received a copy of the GNU Lesser General Public License
+* along with this program.  If not, 
+* see "http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html/".
+*
+* Description:
+*
+*/
+
+#include <QtGui>
+#include <QNetworkReply>
+#include <QGraphicsScene>
+#include <QImage>
+#include <QTimeLine>
+#include <QPainterPath>
+#include "qwebpage.h"
+#include "qwebframe.h"
+#include "qwebview.h"
+#include "qwebelement.h"
+#include "chromewidget.h"
+#include "chromerenderer.h"
+#include "chromesnippet.h"
+#include "chromewidgetjsobject.h"
+#include "chromeview.h"
+#include "attentionanimator.h"
+#include "visibilityanimator.h"
+//NB: remove these
+#include "animations/fadeanimator.h"
+#include "animations/bounceanimator.h"
+#include "animations/flyoutanimator.h"
+
+#include "utilities.h"
+#include <assert.h>
+
+//Temporary include
+#include <QDebug>
+
+#ifdef G_TIMING
+#include "gtimer.h"
+#endif
+
+class UpdateBufferEvent : public QEvent {
+  public:
+    UpdateBufferEvent()
+      : QEvent(customType()) {
+    }
+    static QEvent::Type customType() {
+        static int type = QEvent::registerEventType();
+        return (QEvent::Type) type;
+    }
+};
+
+ChromeWidget::ChromeWidget(ChromeView *parentChromeView, QGraphicsItem *parent, const QString &jsName)
+  :QObject(),
+   m_chromePage(0),
+   m_parentItem(parent),
+   m_parentChromeView(parentChromeView),
+   m_state(maximized),
+   m_buffer(0),
+   m_painter(0),
+   m_dirtyTimer(0),
+   m_jsObject(new ChromeWidgetJSObject(this, this, jsName))
+{
+  // Connect signals generated by this object to signals on the javascript object.
+  safe_connect(this, SIGNAL(loadStarted()), m_jsObject, SIGNAL(loadStarted()));
+  safe_connect(this, SIGNAL(loadComplete()), m_jsObject, SIGNAL(loadComplete()));
+  safe_connect(this, SIGNAL(dragStarted()), m_jsObject, SIGNAL(dragStarted()));
+  safe_connect(this, SIGNAL(dragFinished()), m_jsObject, SIGNAL(dragFinished()));
+  safe_connect(this, SIGNAL(viewPortResize(QRect)), m_jsObject, SIGNAL(viewPortResize(QRect)));
+
+  //Allocate an instance of webkit to render the chrome
+  ChromeRenderer *pageView = new ChromeRenderer(parentChromeView->parentWidget());
+  safe_connect(pageView, SIGNAL(symbianCarriageReturn()), m_jsObject, SIGNAL(symbianCarriageReturn()));
+  //QWebView *pageView = new QWebView(parentChromeView->parentWidget());
+
+  pageView->show();
+  m_chromePage = pageView->page();
+
+  //Render to a transparent background (see WebKit bug 29414)
+  QPalette palette = m_chromePage->palette();
+  palette.setColor(QPalette::Base, Qt::transparent);
+  m_chromePage->setPalette(palette);
+
+  // No scrolling of the chrome
+  m_chromePage->mainFrame()->setScrollBarPolicy(Qt::Vertical, Qt::ScrollBarAlwaysOff);
+  m_chromePage->mainFrame()->setScrollBarPolicy(Qt::Horizontal, Qt::ScrollBarAlwaysOff);
+
+  // Display the page view offscreen to ensure that it doesn't grab focus from chrome widget
+  pageView->setGeometry(-1600, 0, 5, 5);
+
+  // Connect QtWebPage signals
+  safe_connect(chromePage(), SIGNAL(frameCreated(QWebFrame*)), this, SLOT(frameCreated(QWebFrame*)));
+  safe_connect(chromePage(), SIGNAL(loadStarted()), this, SLOT(onLoadStarted()));
+  safe_connect(chromePage(), SIGNAL(loadFinished(bool)), this, SLOT(loadFinished(bool)));
+  safe_connect(chromePage(), SIGNAL(repaintRequested(QRect)), this, SLOT(repaintRequested(QRect)));
+
+  //External links in chrome are delegated to a content view so we
+  //propagate the QWebPage::linkClicked signal. The idea is that
+  //chrome does not normally load external content into the chrome
+  //itself (though chrome can still load content via XHR). Typically,
+  //the active  web view handles this signal. This allows chrome to contain
+  //links to external content that get loaded into the web view. An
+  //example would be a news feed that renders feed item titles in a chrome
+  //pop-up, but which loads the feed content into the main web view.
+
+  chromePage()->setLinkDelegationPolicy(QWebPage::DelegateExternalLinks);
+  QObject::connect(chromePage(), SIGNAL(linkClicked(const QUrl&)), this, SIGNAL(delegateLink(const QUrl&)));
+
+  installEventFilter(this);
+}
+
+ChromeWidget::~ChromeWidget(){
+  delete m_painter;
+  delete m_jsObject; 
+  delete m_buffer;
+}
+
+
+QObject *ChromeWidget::jsObject() { 
+  return static_cast<QObject *>(m_jsObject); 
+}
+
+#ifdef Q_OS_SYMBIAN
+QPixmap * ChromeWidget::buffer()
+#else
+QImage * ChromeWidget::buffer()
+#endif
+{
+  return m_buffer;
+}
+
+QPainter * ChromeWidget::painter(){
+  return m_painter;
+}
+
+void ChromeWidget::resizeBuffer(){
+  //qDebug() << "ChromeWidget::resizeBuffer: " << chromePage()->mainFrame()->contentsSize();
+  if(m_painter) {
+      m_painter->end();
+      delete m_painter;
+      m_painter = 0;
+  }
+  if(m_buffer) 
+      delete m_buffer;
+#ifdef Q_OS_SYMBIAN
+  m_buffer = new QPixmap(chromePage()->mainFrame()->contentsSize());
+#else
+  m_buffer = new QImage(chromePage()->mainFrame()->contentsSize(), QImage::Format_ARGB32_Premultiplied);
+#endif
+  m_buffer->fill(Qt::transparent);  
+  m_painter = new QPainter(m_buffer);
+}
+
+void ChromeWidget::setChromeUrl(QString url)
+{
+  //qDebug() << "ChromeWidget::setChromeUrl: " << url;
+  if(chromePage() && chromePage()->mainFrame()){
+#ifdef G_TIMING
+    GTimer * t = new GTimer();
+    t->start("ChromeWidget::setChromeUrl()");
+#endif
+    chromePage()->mainFrame()->load(QUrl(url));
+#ifdef G_TIMING
+   t->stop();
+   t->save();
+   delete t;
+#endif
+  }
+}
+
+void ChromeWidget::setGeometry(const QRect &rect)
+{
+  m_chromePage->setViewportSize(QSize(rect.size().width(), 1000));
+  resizeBuffer();
+  updateChildGeometries();
+}
+
+
+void ChromeWidget::toggleVisibility(const QString & elementId)
+{
+  ChromeSnippet * snippet = getSnippet(elementId);
+  if(snippet)
+    snippet->toggleVisibility();
+}
+
+void ChromeWidget::setLocation(const QString& id, int x, int y)
+{
+  ChromeSnippet * snippet = getSnippet(id);
+  if(snippet)
+    snippet->setPos(x,y);
+}
+
+void ChromeWidget::setAnchor(const QString& id, const QString& anchor){
+  ChromeSnippet * snippet = getSnippet(id);
+  if(snippet)
+    snippet->setAnchor(anchor);
+}
+
+void ChromeWidget::show(const QString & elementId, int x, int y)
+{
+  ChromeSnippet * snippet = getSnippet(elementId);
+
+  if(snippet){
+    snippet->setPos(x,y);
+    snippet->show(true);
+  }
+}
+
+void ChromeWidget::show(const QString & elementId)
+{
+  ChromeSnippet * snippet = getSnippet(elementId);
+
+  if(snippet){
+    //snippet->show(true);
+     snippet->show(false);
+  }
+}
+
+
+void ChromeWidget::hide(const QString & elementId)
+{
+  ChromeSnippet * snippet = getSnippet(elementId);
+  if(snippet)
+    snippet->hide(true);
+}
+
+void ChromeWidget::toggleAttention(const QString & elementId){
+  ChromeSnippet * snippet = getSnippet(elementId);
+  if(snippet) {
+    //qDebug() << "ChromeWidget::toggleAttention " << elementId; 
+    snippet->toggleAttention();
+  }
+}
+
+void ChromeWidget::setVisibilityAnimator(const QString& elementId, const QString & animatorName){
+ ChromeSnippet * snippet = getSnippet(elementId);
+  if(snippet) {
+    VisibilityAnimator * animator = VisibilityAnimator::create(animatorName, snippet);
+    snippet->setVisibilityAnimator(animator); // NB: Move this to visibility animator implementation
+  }
+}
+
+void ChromeWidget::setAttentionAnimator(const QString& elementId, const QString & animatorName){
+ChromeSnippet * snippet = getSnippet(elementId);
+  if(snippet) {
+     AttentionAnimator * animator = AttentionAnimator::create(animatorName, snippet);
+    snippet->setAttentionAnimator(animator); // NB: Move this to visibility animator implementation
+  }
+}
+
+//NB: Factor out snippet cleanup and use in destructor too
+
+void ChromeWidget::onLoadStarted()  // slot
+{
+  qDebug() << "ChromeWidget::onLoadStarted";
+#ifdef G_TIMING
+  GTimer * t = new GTimer();
+  t->start("ChromeWidget::loadStarted");
+#endif
+  //First zero out all of the non-root snippets. These
+  //will be deleted when the root snippets are deleted.
+  QMapIterator<QString, ChromeSnippet*> i(m_snippetMap);
+  while(i.hasNext()){
+    i.next();
+    if(i.value()->parentItem() != m_parentItem){
+      m_snippetMap[i.key()] = 0;
+    }
+  }
+  //Now delete the root snippets.
+  foreach(ChromeSnippet *snippet, m_snippetMap){
+    if(snippet){
+      //Remove about-to-be-deleted snippet from parent scene
+      m_parentChromeView->getScene()->removeItem(snippet);
+      delete snippet;
+    }
+  }
+  m_snippetMap.clear();
+//  m_topSnippet = 0;
+//  m_bottomSnippet = 0;
+  //m_popSnippet = 0;
+  //Does anybody care about this signal?
+  emit loadStarted();
+#ifdef G_TIMING
+  t->stop();
+  t->save();
+  delete t;
+#endif
+}
+
+
+QString ChromeWidget::getDisplayMode() 
+{
+	return m_parentChromeView->getDisplayMode(); 
+	
+}
+	
+	
+void ChromeWidget::frameCreated(QWebFrame* frame){
+  Q_UNUSED(frame)
+  //qDebug() << "===>ChromeWidget::frameCreated";
+}
+
+void ChromeWidget::loadFinished(bool ok)  // slot
+{
+#ifdef G_TIMING
+  GTimer * t = new GTimer();
+  t->start("ChromeWidget::loadFinished");
+#endif
+  qDebug() << "ChromeWidget::loadFinished";
+  if(!ok)
+  {
+    qDebug() << "ChromeWidget::loadFinished: error";
+    return;
+  }
+  getInitialChrome();
+  resizeBuffer();
+  updateChildGeometries();
+  emit loadComplete();
+#ifdef G_TIMING
+  t->stop();
+  t->save();
+  delete t;
+#endif
+}
+
+void ChromeWidget::getInitialChrome(){
+  
+  QWebElement doc = chromePage()->mainFrame()->documentElement();
+#if QT_VERSION < 0x040600
+  QList <QWebElement> initialSnippets = doc.findAll(".GinebraSnippet");
+#else
+  QList <QWebElement> initialSnippets = doc.findAll(".GinebraSnippet").toList();
+#endif
+  foreach(QWebElement element, initialSnippets) {
+    ChromeSnippet* s = getSnippet(element.attribute("id"));
+    if((element.attribute("data-GinebraVisible","false"))=="true"){
+      s->show(false);
+    }
+    else {
+      s->hide();
+    }
+  }
+}
+
+ChromeSnippet *ChromeWidget::getSnippet(const QString &docElementId, QGraphicsItem *parent) {
+ 
+  ChromeSnippet *result = m_snippetMap.value(docElementId);
+  if(!result){
+    QWebElement doc = chromePage()->mainFrame()->documentElement();
+    QWebElement element = doc.findFirst("#" + docElementId);
+    QRect rect = getDocElementRect(docElementId);
+    if(!rect.isNull()){
+      QGraphicsItem * p = (parent)?parent:m_parentItem;
+      
+      // Create the snippet, pass the ChromeWidget's javascript object in so that it can
+      // be used as the parent of the snippet's javascript object.
+      result = new ChromeSnippet(p, this, jsObject(), docElementId);
+      
+      // Make sure snippets are shown above the content view.
+      result->setZValue(3);
+      
+      //result->setAnchor("AnchorCenter");
+      //qDebug() << "Creating snippet: " << docElementId << ":" << (int) result;  
+      // Set up connections to freeze the main content page while snippets are being dragged
+      // to improve performance on complex pages.
+      safe_connect(result->getJSObject(), SIGNAL(dragStarted()), this, SIGNAL(dragStarted()));
+      safe_connect(result->getJSObject(), SIGNAL(dragFinished()), this, SIGNAL(dragFinished()));
+      //Note that the following can be inefficient if several snippets are
+      //made visible/invisible at once, which will result is successive
+      //updates to the viewport. Optimize this to coalesce updates.
+      safe_connect(result->getJSObject(), SIGNAL(onHide()), this, SLOT(updateViewPort()));
+      safe_connect(result->getJSObject(), SIGNAL(onShow()), this, SLOT(updateViewPort()));
+      //qDebug() << "Snippet child count: " << p->childItems().size() << " parent=" << ((QGraphicsWidget *)p)->objectName();
+      //qDebug() << "ChromeWidget::getSnippet: " << docElementId << " " << rect;
+
+      result->setOwnerArea(rect);
+      //Snippet size is determined by owner area.
+      result->resize(rect.size());
+      //Set auto-layout attributes
+      result->setAnchor(element.attribute("data-GinebraAnchor", "AnchorNone"));
+      result->setHidesContent( element.attribute("data-GinebraHidesContent", "false") == "true" );
+      result->setAnchorOffset( element.attribute("data-GinebraAnchorOffset", "0").toInt() ); //toInt() returns 0 for malformed string
+      m_snippetMap[docElementId] = result;
+      //NB: not very efficient
+      QList <QVariant> chromeButtons = getChildIdsByClassName(docElementId, "GinebraButtonSnippet").toList();
+      //qDebug() << "Chrome row size: " << chromeButtons.size();
+      for(int i = 0; i < chromeButtons.size();i++) {
+        qDebug() << "Chrome row button: " << chromeButtons[i].toString();
+        getSnippet(chromeButtons[i].toString(),result);
+      }
+  
+    }
+    else{
+      //qDebug() << "ChromeWidget::getSnippet: snippet not found, id=" << docElementId;
+      return 0;
+    }
+  }else{
+    //qDebug() << "Found existing snippet: " << docElementId;
+  }
+
+  return result;
+}
+
+/* Do a re-layout of the chrome. This gets snippet geometries, sets positions
+ * and calculates the viewport size. This gets called when:
+ * - New chrome is loaded
+ * - The chrome is resized
+ * This doesn't get called when chrome snippet visibility changes
+ * or snippets get moved so that animations don't invoke multiple
+ * relayouts. This means that visiblity changes need to explicitly
+ * invoke a viewport size calculation if they want to resize the
+ * viewport.
+ */
+
+void ChromeWidget::updateChildGeometries()
+{
+  QRect viewRect(QPoint(0,0), m_parentChromeView->geometry().size());
+  //qDebug() << "ChromeWidget::updateChildGeometries: viewRect=" << viewRect;
+  //m_chromePage->setViewportSize(viewRect.size());
+
+  updateOwnerAreas();
+  
+  //NB: It would be more efficient to calculate the viewport as snippet geometry is set
+  //though this ought to be done without duplicating code between here and updateViewport()
+  
+  foreach(ChromeSnippet *snippet, m_snippetMap) {
+    qreal sHeight = snippet->ownerArea().height();
+    if(snippet->anchor()=="AnchorTop"){
+      snippet->setPos(0, snippet->anchorOffset());
+      snippet->resize(viewRect.width(), sHeight);
+    }
+    else if(snippet->anchor()=="AnchorBottom"){
+      //NB: Why do we need to subtract 2 from y coord here???
+      //snippet->setPos(0, viewRect.height() - sHeight - snippet->anchorOffset() -2);
+      snippet->setPos(0, viewRect.height() - sHeight - snippet->anchorOffset());
+      snippet->resize(viewRect.width(), sHeight);
+    }
+    else if(snippet->anchor()=="AnchorCenter"){
+      qreal sWidth = snippet->ownerArea().width();
+      snippet->setPos((viewRect.width()-sWidth)/2,(viewRect.height()-sHeight)/2);
+      snippet->resize(sWidth, sHeight);
+    }
+    else if(snippet->anchor()=="AnchorFullScreen"){
+      snippet->setRect(0,0,viewRect.width(), viewRect.height());
+    }
+    snippet->updateChildGeometries();
+    
+  }
+  
+  updateViewPort();
+
+  repaintRequested(viewRect); //Do intial repaint of the whole chrome after snippets are inited
+}
+
+//Updates the current viewport size to the area not covered by visible top and bottom chrome.
+
+void ChromeWidget::updateViewPort() {
+  QRect viewPort(QPoint(0,0), m_parentChromeView->geometry().size());
+  
+  //NB: Note that this algorithm assumes that anchor offsets do NOT
+  //shrink the viewport. I.e., if you have an offset snippet it is
+  //assumed either that it hides content (HidesContent attribute is set)
+  //or that it is being stacked on another anchored snippet. An offset snippet 
+  //that is not being stacked on another snippet and that does not have content hiding
+  //set (HidesContent attribute) will typically show on top of the content window
+  //with the content window reduced by the size of the snippet.
+  int viewPortY = 0;
+  foreach(ChromeSnippet *snippet, m_snippetMap) {
+    if(!snippet->hidesContent()){
+      if((snippet->anchor()=="AnchorTop") && snippet->isVisible() && !snippet->isHiding()){
+        int snippetY = snippet->pos().y() + snippet->ownerArea().height();
+        if  (snippetY > viewPortY) {
+            viewPortY = snippetY;
+        }
+      }
+      else if((snippet->anchor()=="AnchorBottom") && snippet->isVisible() && !snippet->isHiding()){
+        viewPort.adjust(0, 0, 0, (int)-snippet->ownerArea().height());
+      }
+    }
+  }
+  viewPort.adjust(0, viewPortY, 0, 0);
+  emit viewPortResize(viewPort);
+}
+
+//Explicitly reset the viewport to a specified rectangle
+
+void ChromeWidget::setViewPort(QRect viewPort){
+  emit viewPortResize(viewPort);
+}
+
+void ChromeWidget::networkRequestFinished(QNetworkReply *reply){  // slot
+  if(reply->error() != QNetworkReply::NoError) {
+    //qDebug() << "ChromeWidget::networkRequestFinished: " << reply->errorString();
+  }
+}
+
+// Called when some part of the chrome page needs repainting.  Uses a custom event to delay calling mainFrame->render()
+// since in some cases render() can crash -- apparently when it tries to paint an element that has
+// been deleted (by javascript etc.).  Coalesces multiple calls to repaintRequested() into one call to
+// paintDirtyRegion().
+void ChromeWidget::repaintRequested(QRect dirtyRect){  // slot
+  //qDebug() << "ChromeWidget::repaintRequested: " << dirtyRect;
+
+#ifdef G_TIMING
+ GTimer * t = new GTimer();
+ t->start("ChromeWidget::repaintRequested");
+#endif
+
+#ifdef Q_OS_SYMBIANXX // turn off the hack for now, remove eventually
+  // Hack to get around painting issue in text fields.  Backspacing doesn't appear to generate
+  // repaint requests though the blinking caret does.  Since the caret is very narrow this leaves 
+  // behind artifacts of the character that was deleted.
+  dirtyRect.setRight(dirtyRect.right() + 20);
+  
+  //NB:Delayed repaints don't get invoked on NSP, at least on emulator
+  //so paint immediately. Note that delayed repaints are a work-around
+  //for JS/DOM issues in WebKit, so this needs to be revisited.
+  m_dirtyRegion = dirtyRect;
+  paintDirtyRegion();
+#else
+  if(m_dirtyRegion.isEmpty()) {
+      m_dirtyRegion += dirtyRect;
+      QCoreApplication::postEvent(this, new UpdateBufferEvent);
+  }
+  else
+      m_dirtyRegion += dirtyRect;
+#endif
+#ifdef G_TIMING
+  t->stop();
+  t->save();
+  delete t;
+#endif
+}
+
+void ChromeWidget::paintDirtyRegion() {
+  //qDebug() << "ChromeWidget::paintDirtyRegion" << m_dirtyRegion;
+  
+  if(m_dirtyRegion.isEmpty())
+      return;
+  if(m_buffer){
+    m_painter->save(); //NB: would it be more efficient just to create a new painter on the stack?
+    //Must set clip rect because frame may render background(?) outside dirty rect
+    m_painter->setClipRegion(m_dirtyRegion);
+    if(chromePage() && chromePage()->mainFrame())
+        chromePage()->mainFrame()->render(m_painter, m_dirtyRegion);
+    m_painter->restore();
+  }
+
+  foreach(ChromeSnippet *snippet, m_snippetMap) {
+    if((snippet->parentItem() == m_parentItem) && snippet->isVisible() && m_dirtyRegion.intersects(snippet->ownerArea().toRect())) {
+      //  qDebug() << "Dirty rect intersects: " << snippet->docElementId() << ": " << snippet->ownerArea().toRect();
+      snippet->update();
+    }
+  }
+
+  // Clear dirty region.
+  m_dirtyRegion = QRegion();
+}
+
+
+// Update owner areas of all snippets to allow for changes in chrome page geometry.
+void ChromeWidget::updateOwnerAreas() {
+  foreach(ChromeSnippet *snippet, m_snippetMap) {
+    snippet->setOwnerArea(getDocElementRect(snippet->docElementId()));
+  }
+}
+
+//NB: The following methods should also be implementable, and possibly
+//more efficient, via the C++ DOM API
+
+void ChromeWidget::debugAlert(const QString &msg){
+  chromePage()->mainFrame()->evaluateJavaScript("alert('" + msg + "')");
+}
+
+QVariant ChromeWidget::getDocElement(const QString &id) {
+  return chromePage()->mainFrame()->evaluateJavaScript("document.getElementById('" + id + "')");
+}
+
+QVariant ChromeWidget::getDocIdsByName(const QString &name){
+
+  QString js (
+	      "var elements = document.getElementsByName('" + name + "');"
+              "var result = new Array();"
+              "for(i = 0 ; i< elements.length; i++){"
+              " result[i]=elements[i].id;"
+              "}"
+              "result;"
+	     );
+  return chromePage()->mainFrame()->evaluateJavaScript(js);
+}
+
+QVariant ChromeWidget::getDocIdsByClassName(const QString &name){
+
+  QString js (
+              "var elements = document.getElementsByClassName('" + name + "');"
+              "var result = new Array();"
+              "for(i = 0 ; i< elements.length; i++){"
+              " result[i]=elements[i].id;"
+              "}"
+              "result;"
+             );
+  return chromePage()->mainFrame()->evaluateJavaScript(js);
+}
+
+QVariant ChromeWidget::getChildIdsByClassName(const QString &parentId, const QString &name){
+
+  QString js (
+	      "var elements = document.getElementsByClassName('" + name + "');"
+              "var result = new Array();"
+              "for(i = 0 ; i< elements.length; i++){"
+              "if(elements[i].parentNode.id == '" + parentId +"'){"
+              " result[i]=elements[i].id;"
+              "}"
+              "}"
+              "result;"
+	     );
+  return chromePage()->mainFrame()->evaluateJavaScript(js);
+
+}
+
+QSize ChromeWidget::getDocElementSize(const QString &id) {
+  QSize result;
+  QVariant jObj = getDocElement(id);
+  if(jObj.isValid()) {
+      QMap<QString, QVariant> jMap = jObj.toMap();
+      //qDebug() << "Tagname: " << (jMap["tagName"].toString());
+      result.setWidth(jMap["clientWidth"].toInt());
+      result.setHeight(jMap["clientHeight"].toInt());
+  }
+  else {
+    qDebug() << "ChromeWidget::getDocElementSize: element not found. " << id;
+  }
+  return result;
+}
+
+QString ChromeWidget::getDocElementAttribute(const QString &id, const QString &attribute) {
+  QString result;
+  QVariant jObj = getDocElement(id);
+  if(jObj.isValid()) {
+      QMap<QString, QVariant> jMap = jObj.toMap();
+      //qDebug() << "Tagname: " << (jMap["tagName"].toString());
+      result = jMap[attribute].toString();
+  }
+  else {
+    qDebug() << "ChromeWidget::getDocElementSize: element not found. " << id;
+  }
+  return result;
+}
+
+QRect ChromeWidget::getDocElementRect(const QString &id) {
+  QString js("var obj = document.getElementById('" + id + "');"
+             "var width = obj.clientWidth;"
+             "var height = obj.clientHeight;"
+             "var curleft = curtop = 0;"
+             "do {"
+             "  curleft += obj.offsetLeft;"
+             "  curtop += obj.offsetTop;"
+             "} while (obj = obj.offsetParent);"
+             "[curleft, curtop, width, height]");
+  QVariant jObj = chromePage()->mainFrame()->evaluateJavaScript(js);
+  if(jObj.isValid()) {
+    return QRect(jObj.toList()[0].toInt(), jObj.toList()[1].toInt(), jObj.toList()[2].toInt(), jObj.toList()[3].toInt());
+  }
+  else {
+    qDebug() << "ChromeWidget::getDocElementRect: element not found. " << id;
+    return QRect();
+  }
+}
+
+// Private.  This class shadows the Qt class QComboBoxPrivateContainer to provide access its
+// the 'combo' pointer in eventFilter().
+class xQComboBoxPrivateContainer : public QFrame
+{
+  public:
+    int spacing() const;
+    QTimer blockMouseReleaseTimer;
+    QBasicTimer adjustSizeTimer;
+    QPoint initialClickPosition;
+    QComboBox *combo;
+    QAbstractItemView *view;
+    void *top;
+    void *bottom;
+};
+
+bool ChromeWidget::eventFilter(QObject *object, QEvent *event)
+{
+    // Shameless hack here.  We need to intercept the creation of combobox drop-downs
+    // in the chrome and move them into their correct positions since the system thinks they belong
+    // off-screen over where the chrome page is actually rendered.  Since drop-downs are grandchildren
+    // of the ChromeRenderer we start by watching for child added events, when one is created we
+    // watch it also for child added events too, thereby watching grandchild events.  When we
+    // see a QComboBoxPrivateContainer (the drop-down list) being moved we move it instead into
+    // position just under the combobox.
+
+    //qDebug() << "ChromeWidget::eventFilter: " << event->type();
+
+    switch ((int)event->type()) {
+      case QEvent::ChildAdded:
+      case QEvent::ChildPolished:
+      {
+        QChildEvent *childEvt = static_cast<QChildEvent *>(event);
+        //qDebug() << "    watching " << childEvt->child();
+        childEvt->child()->installEventFilter(this);
+        break;
+      }
+      case QEvent::Move:
+      {
+        //QMoveEvent *evt = static_cast<QMoveEvent *>(event);
+        //qDebug() << "    oldpos " << evt->oldPos() << " pos " << evt->pos();
+        if(object->inherits("QComboBoxPrivateContainer")) {
+            xQComboBoxPrivateContainer *cbpc = static_cast<xQComboBoxPrivateContainer *>(object);
+            QComboBox *combo = cbpc->combo;
+            QRect comboRect = combo->geometry();
+            QPoint comboPos = comboRect.topLeft();
+            ChromeSnippet *snippet = getSnippet(comboPos);
+            if(snippet) {
+                QPoint relativePos = comboPos - snippet->ownerArea().topLeft().toPoint();
+                static_cast<QWidget *>(object)->move(m_parentChromeView->mapToGlobal(QPoint(0,0))
+                                                     + snippet->rect().topLeft().toPoint()
+                                                     + relativePos
+                                                     + QPoint(0, comboRect.height()));
+            }
+        }
+        break;
+      }
+      default:
+      {
+        if(event->type() == UpdateBufferEvent::customType()) {
+            if(object == this) {
+                //qDebug() << "ChromeWidget::eventFilter: UpdateBufferEvent " << (void*)object << event;
+                paintDirtyRegion();
+            }
+        }
+        break;
+      }
+    }
+
+    return QObject::eventFilter(object, event);
+}
+
+ChromeSnippet *ChromeWidget::getSnippet(QPoint pos) const {
+    foreach(ChromeSnippet *snippet, m_snippetMap) {
+        if(snippet->ownerArea().contains(pos))
+            return snippet;
+    }
+    return 0;
+}
+
+void ChromeWidget::dump() {
+    qDebug() << "ChromeWidget::dump";
+    foreach(ChromeSnippet *snippet, m_snippetMap) {
+        snippet->dump();
+        qDebug() << "------";
+    }
+}