--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ginebra2/ContentViews/WebContentAnimationItem.cpp	Tue Jul 06 14:03:49 2010 +0300
@@ -0,0 +1,177 @@
+/*
+* 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 "WebContentAnimationItem.h"
+
+#include <QGraphicsWebView>
+#include <QtGlobal>
+#include <QWebElement>
+#include <QWebFrame>
+
+static const int MinDoubleClickZoomTargetWidth = 100;     //Target block width for applying double tap zoom
+static const int ZoomCommitDuration = 50;                 //Timeout before commiting zoom
+static const qreal ZoomableContentMinWidth = 300.;
+
+namespace GVA {
+
+WebContentAnimationItem::WebContentAnimationItem(QGraphicsWidget* parent, Qt::WindowFlags wFlags)
+    : QGraphicsWidget(parent, wFlags)
+    , m_zoomCommitTimer(this)
+    , m_viewportMetaData(0)
+{
+    setFlag(QGraphicsItem::ItemHasNoContents, true);
+    setFlag(QGraphicsItem::ItemClipsChildrenToShape, true);
+    setFlag(QGraphicsItem::ItemClipsToShape, true);
+
+    setFiltersChildEvents(true);
+
+    connect(&m_zoomCommitTimer, SIGNAL(timeout()), this, SLOT(commitZoom()));
+    m_zoomCommitTimer.setSingleShot(true);
+}
+
+WebContentAnimationItem::~WebContentAnimationItem()
+{}
+
+void WebContentAnimationItem::setWebView(QGraphicsWebView* webView)
+{
+    Q_ASSERT(m_webView);
+    m_webView = webView;
+
+    //Enabling resize to contents avoids scrollbars in mainframe
+    m_webView->setResizesToContents(true);
+    m_webView->setParentItem(this);
+    m_webView->setAttribute(Qt::WA_OpaquePaintEvent, true);
+}
+
+void WebContentAnimationItem::updatePreferredContentSize(const QSize& size)
+{
+    // FIXME: we have bug in QtWebKit API when tileCacheEnabled is true.
+    // this causes viewport not to reset between the page loads.
+    // Thus, we need to update viewport manually until we have fix for this.
+
+    m_webView->page()->setPreferredContentsSize(size);
+    resize(contentsSize());
+}
+
+QSize WebContentAnimationItem::contentsSize() const
+{
+    return m_webView->page()->mainFrame()->contentsSize();
+}
+
+void WebContentAnimationItem::setZoomScale(qreal value, bool immediateCommit)
+{
+    value = qBound(m_viewportMetaData->m_minimumScale, value, m_viewportMetaData->m_maximumScale);
+    qreal curZoomScale = zoomScale();
+
+    if (qFuzzyCompare(value, curZoomScale)) {
+        notifyZoomActions(curZoomScale);
+        return;
+    }
+
+    if (!immediateCommit)
+        disableContentUpdates();
+
+    m_webView->setScale(value);
+
+    if (immediateCommit)
+        commitZoom();
+    else
+        m_zoomCommitTimer.start(ZoomCommitDuration);
+}
+
+qreal WebContentAnimationItem::zoomScale() const
+{
+    if (!m_webView)
+        return 1.;
+
+    return m_webView->scale();
+}
+
+QRectF WebContentAnimationItem::findZoomableRectForPoint(const QPointF& point)
+{
+    QPointF zoomPoint = m_webView->mapFromParent(point);
+
+    QWebHitTestResult hitResult = m_webView->page()->mainFrame()->hitTestContent(zoomPoint.toPoint());
+    QWebElement targetElement = hitResult.enclosingBlockElement();
+
+    while (!targetElement.isNull() && targetElement.geometry().width() < MinDoubleClickZoomTargetWidth)
+        targetElement = targetElement.parent();
+
+    if (!targetElement.isNull()) {
+        QRectF elementRect = targetElement.geometry();
+        qreal overMinWidth = elementRect.width() - ZoomableContentMinWidth;
+        if (overMinWidth < 0)
+            elementRect.adjust(overMinWidth / 2, 0, -overMinWidth / 2, 0);
+        zoomPoint.setX(elementRect.x());
+        QRectF resultRect(zoomPoint, elementRect.size());
+        return QRectF(m_webView->mapToParent(resultRect.topLeft()),
+                      m_webView->mapToParent(resultRect.bottomRight()));
+    }
+    return QRectF();
+}
+
+void WebContentAnimationItem::disableContentUpdates()
+{
+    //Disable tiling updates
+    m_webView->setTiledBackingStoreFrozen(true);
+}
+
+void WebContentAnimationItem::enableContentUpdates()
+{
+    //Enable tiling updates
+    m_webView->setTiledBackingStoreFrozen(false);
+}
+
+void WebContentAnimationItem::commitZoom()
+{
+    m_zoomCommitTimer.stop();
+    notifyZoomActions(zoomScale());
+    enableContentUpdates();
+}
+
+void WebContentAnimationItem::resizeEvent(QGraphicsSceneResizeEvent* event)
+{
+    QGraphicsWidget::resizeEvent(event);
+    setZoomScale(size().width() / contentsSize().width());
+}
+
+void WebContentAnimationItem::notifyZoomActions(qreal newScale)
+{
+    bool enableZoomIn = false;
+    bool enableZoomOut = false;
+
+    if (m_viewportMetaData->m_userScalable) {
+
+        if (newScale > m_viewportMetaData->m_minimumScale)
+            enableZoomOut = true;
+        else
+            enableZoomOut = false;
+
+        if (newScale < m_viewportMetaData->m_maximumScale)
+            enableZoomIn = true;
+        else
+            enableZoomIn = false;
+	} 
+
+    emit updateZoomActions(enableZoomIn, enableZoomOut);
+}
+
+} //namespace GVA