webengine/osswebengine/WebKit/s60/webview/WebScrollingDecelerator.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 27 Aug 2009 07:44:59 +0300
changeset 16 a359256acfc6
parent 0 dd21522fd290
child 92 e1bea15f9a39
permissions -rw-r--r--
Revision: 200929 Kit: 200935
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/*
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* Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of the License "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:   Implementation of scrolling decelerator
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*
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*/
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// INCLUDE FILES
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#include <../bidi.h>
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#include "WebScrollingDecelerator.h"
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#include "WebView.h"
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#include "WebFrame.h"
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#include "WebFrameView.h"
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#include "WebPageScrollHandler.h"
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#include "PlatformScrollbar.h"
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// constants
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const int KRecordSize = 4;
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// The following deceleration curve is generated by a script
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// It lists the timeout dt values in microseconds.
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const int KDecelCurveSize = 10;
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const int KScrollIntervalTimeout = 40000; // scroll timer interval in microseconds
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// ============================ MEMBER FUNCTIONS ===============================
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// -----------------------------------------------------------------------------
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// WebScrollingDecelerator::NewL
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// The two-phase Symbian constructor
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// -----------------------------------------------------------------------------
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//
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WebScrollingDecelerator* WebScrollingDecelerator::NewL(WebView& webView)
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{
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    WebScrollingDecelerator* self = new (ELeave) WebScrollingDecelerator(webView);
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    CleanupStack::PushL(self);
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    self->ConstructL();
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    CleanupStack::Pop(); //self
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    return self;
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}
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// -----------------------------------------------------------------------------
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// WebScrollingDecelerator::WebScrollingDecelerator
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// C++ default constructor can NOT contain any code, that
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// might leave.
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// -----------------------------------------------------------------------------
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//
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WebScrollingDecelerator::WebScrollingDecelerator(WebView& webView)
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: CTimer(EPriorityHigh), m_webView( webView )
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{
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}
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// -----------------------------------------------------------------------------
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// WebScrollingDecelerator::ConstructL
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// -----------------------------------------------------------------------------
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void WebScrollingDecelerator::ConstructL()
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{
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    CTimer::ConstructL();
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    CActiveScheduler::Add( this );
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    m_dragPosition.Reset();
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}
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// -----------------------------------------------------------------------------
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// Destructor
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// -----------------------------------------------------------------------------
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WebScrollingDecelerator::~WebScrollingDecelerator()
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{
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    Cancel();
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}
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// -----------------------------------------------------------------------------
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// WebScrollingDecelerator::updatePos
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// update record of position
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// -----------------------------------------------------------------------------
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//
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void WebScrollingDecelerator::updatePos()
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{
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    if (m_dragPosition.Count() >= KRecordSize)
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      {
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        // pop item from front   
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        m_dragPosition.Remove(0);
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      }
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    // and add this one to the end
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    TPoint currPosition = m_webView.pageScrollHandler()->currentScrollingFrameView()->contentPos();
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    m_dragPosition.Append(currPosition);
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}
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// -----------------------------------------------------------------------------
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// WebScrollingDecelerator::startDecel
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// initialize and start deceleration
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// -----------------------------------------------------------------------------
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//
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void WebScrollingDecelerator::startDecelL()
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{
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    int count = m_dragPosition.Count();
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    m_normalizedCurrentPosition.iX = m_webView.pageScrollHandler()->currentScrollingFrameView()->contentPos().iX * 100;
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    m_normalizedCurrentPosition.iY = m_webView.pageScrollHandler()->currentScrollingFrameView()->contentPos().iY * 100;
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    if (count > 0)
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      {     
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      // set the delta based upon the change span of points collected averaged over the span, so long as we have moved
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        int dx = (m_dragPosition[count - 1].iX - m_dragPosition[0].iX)* 100;
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        int dy = (m_dragPosition[count - 1].iY - m_dragPosition[0].iY) * 100;
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        if (abs(dx) > 0 || abs(dy) > 0)
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            {           
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            m_scrolldelta.SetXY( (dx/count), (dy/count) );
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            WebFrameView* view = m_webView.pageScrollHandler()->currentScrollingFrameView();
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            m_scrolldelta = view->toDocCoords(m_scrolldelta);
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            // init num steps
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            m_numscrollsteps = 0;
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            // call the RunL function directly, this first time. CTimer will call it from now on.
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            m_decelelatorSwitch = ETrue;
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            RunL();
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            }
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        }
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        m_dragPosition.Reset();
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}
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// -----------------------------------------------------------------------------
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// WebScrollingDecelerator::RunL
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// continue deceleration
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// -----------------------------------------------------------------------------
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//
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void WebScrollingDecelerator::RunL()
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{
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  WebFrameView* scrollingView = m_webView.pageScrollHandler()->currentScrollingFrameView();
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    // use a pre-calulated deceleration curve to calculate dt
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    if ((m_numscrollsteps >= KDecelCurveSize ) || !m_decelelatorSwitch)
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      {
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        // done
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        Cancel();
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        m_webView.setViewIsScrolling(false);
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        return;
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      }
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    // step to next
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    m_numscrollsteps++;
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    // do the scrolling
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    if (m_webView.pageScrollHandler() && scrollingView) {
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        TPoint newpos;
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        /* With each step decrease m_scrolldelta by 50% */
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        m_scrolldelta.iX = m_scrolldelta.iX >> 1;
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        m_scrolldelta.iY = m_scrolldelta.iY >> 1;
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        m_normalizedCurrentPosition += m_scrolldelta;
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        newpos.iX = m_normalizedCurrentPosition.iX/100;
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        newpos.iY = m_normalizedCurrentPosition.iY/100;
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        scrollingView->scrollTo(newpos);
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        if (scrollingView->vScrollbar()) {
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            scrollingView->vScrollbar()->setValue(newpos.iY);
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        }
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        if (scrollingView->hScrollbar()) {
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            scrollingView->hScrollbar()->setValue(newpos.iX);
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        }
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        After(KScrollIntervalTimeout);
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    }
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}
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//  End of File