--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/webengine/osswebengine/WebKit/s60/webview/WebScrollingDeceleratorGH.cpp	Mon Mar 30 12:54:55 2009 +0300
@@ -0,0 +1,190 @@
+/*
+* Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies).
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of the License "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description:   Implementation of scrolling decelerator
+*
+*/
+
+
+// INCLUDE FILES
+#include <../bidi.h>
+#include "WebScrollingDeceleratorGH.h"
+#include "WebView.h"
+#include "WebFrame.h"
+#include "WebFrameView.h"
+#include "WebPageScrollHandler.h"
+#include "PlatformScrollbar.h"
+#include "WebScrollbarDrawer.h"
+
+#include "WebKitLogger.h"
+
+using namespace RT_GestureHelper;
+// constants
+const int KRecordSize = 4;
+
+// The following deceleration curve is generated by a script
+// It lists the timeout dt values in microseconds.
+const int KDecelCurveSize = 10;
+
+const int KScrollIntervalTimeout = 60000; // scroll timer interval in microseconds
+
+const float KDecceleration = -700.0;
+
+int decelTimerCB(TAny* ptr);
+
+
+// ============================ MEMBER FUNCTIONS ===============================
+
+// -----------------------------------------------------------------------------
+// WebScrollingDeceleratorGH::NewL
+// The two-phase Symbian constructor
+// -----------------------------------------------------------------------------
+//
+
+WebScrollingDeceleratorGH* WebScrollingDeceleratorGH::NewL(WebView& webView)
+{
+    WebScrollingDeceleratorGH* self = new (ELeave) WebScrollingDeceleratorGH(webView);
+
+    CleanupStack::PushL(self);
+    self->ConstructL();
+    CleanupStack::Pop(); //self
+    return self;
+}
+
+// -----------------------------------------------------------------------------
+// WebScrollingDeceleratorGH::WebScrollingDeceleratorGH
+// C++ default constructor can NOT contain any code, that
+// might leave.
+// -----------------------------------------------------------------------------
+//
+WebScrollingDeceleratorGH::WebScrollingDeceleratorGH(WebView& webView)
+:  m_webView( webView )
+{
+}
+
+// -----------------------------------------------------------------------------
+// WebScrollingDeceleratorGH::ConstructL
+// -----------------------------------------------------------------------------
+void WebScrollingDeceleratorGH::ConstructL()
+{
+    m_decelTimer = CPeriodic::NewL(CActive::EPriorityStandard);
+}
+
+// -----------------------------------------------------------------------------
+// Destructor
+// -----------------------------------------------------------------------------
+WebScrollingDeceleratorGH::~WebScrollingDeceleratorGH()
+{
+    delete m_decelTimer;
+}
+
+
+int WebScrollingDeceleratorGH::getDecceleration()
+{
+   return  KDecceleration;  
+}
+
+
+int decelTimerCB(TAny* ptr)
+{
+    (static_cast<WebScrollingDeceleratorGH*>(ptr))->scroll();
+    return false;
+}
+
+
+void WebScrollingDeceleratorGH::cancelDecel() 
+{ 
+    m_decelelatorSwitch = false;
+    if (m_decelTimer->IsActive()) {
+        m_decelTimer->Cancel();
+    }
+}
+
+void WebScrollingDeceleratorGH::startDecel(TRealPoint& speed, WebScrollbarDrawer* scrollbarDrawer)
+{
+    m_decelelatorSwitch = true;
+    m_scrollbarDrawer = scrollbarDrawer;
+    m_initSpeed.iX = (-1) * speed.iX;
+    m_initSpeed.iY = (-1) * speed.iY;
+    
+    m_numscrollsteps = 0;
+    if (m_decelTimer->IsActive()) {
+        m_decelTimer->Cancel();
+    }
+    
+    WebFrameView* scrollingView = m_webView.pageScrollHandler()->currentScrollingFrameView();
+    if (scrollingView) {
+        m_startPos = scrollingView->contentPos();
+        m_lastPos = m_startPos;
+        m_decelTimer->Start(0, KScrollIntervalTimeout, 
+                            TCallBack(&decelTimerCB, this));
+    }
+}
+
+void WebScrollingDeceleratorGH::scroll()
+{
+    if (!m_decelelatorSwitch) return;
+    // X = Vst*t - 0.5*a*(t * t)    
+    TPoint dist;
+    TReal32 intervalInSec = static_cast<TReal32>(KScrollIntervalTimeout) / 1000000;
+    TReal32 t = (m_numscrollsteps++) * intervalInSec;
+    TReal32 dx = 0.0;
+    TReal32 dy = 0.0;
+    TReal32 vx = 0.0;
+    TReal32 vy = 0.0;
+    TReal32 accelX = 0.0;
+    TReal32 accelY = 0.0;
+    
+    if (m_initSpeed.iX) {
+        accelX = (m_initSpeed.iX > 0) ?  KDecceleration : (-1) * KDecceleration;
+        vx = m_initSpeed.iX + accelX * t;
+        dx = m_initSpeed.iX * t + 0.5 * accelX * (t * t);
+    }
+        
+    if (m_initSpeed.iY) {
+        accelY = (m_initSpeed.iY > 0) ?  KDecceleration : (-1) * KDecceleration;
+        vy = m_initSpeed.iY + accelY * t;
+        dy = m_initSpeed.iY * t + 0.5 * accelY * (t * t);
+    }
+    
+    dist.SetXY(static_cast<TInt>(dx), static_cast<TInt>(dy));
+    
+    WebFrameView* scrollingView = m_webView.pageScrollHandler()->currentScrollingFrameView();
+    TPoint cpos = scrollingView->contentPos();
+    dist = scrollingView->toDocCoords(dist);
+    TPoint pos = m_startPos + dist;
+    
+    if ((vx * m_initSpeed.iX < 0) || (vy * m_initSpeed.iY < 0) || (vx + vy == 0) ||
+        (m_numscrollsteps > 1 && !scrollingView->needScroll(pos))) {
+        if (m_scrollbarDrawer) {
+            m_scrollbarDrawer->fadeScrollbar();
+        }
+        m_decelTimer->Cancel();
+        m_webView.setViewIsScrolling(false);
+        m_webView.toggleRepaintTimer(true);
+    }
+    else {
+        scrollingView->scrollTo(pos);
+        if (m_scrollbarDrawer) {
+            TPoint scrollDelta = pos - m_lastPos;
+            scrollDelta.iX *= 100;
+            scrollDelta.iY *= 100;
+            m_webView.pageScrollHandler()->updateScrollbars(pos, scrollDelta);   
+        }
+        m_lastPos = pos;
+    }
+    
+}
+
+
+//  End of File