author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 27 Apr 2010 17:46:17 +0300 | |
branch | RCL_3 |
changeset 67 | 4917f9bf7995 |
parent 0 | dd21522fd290 |
child 92 | e1bea15f9a39 |
permissions | -rw-r--r-- |
0
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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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|
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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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|
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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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|
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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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// ----------------------------------------------------------------------------- |
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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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|
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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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// ----------------------------------------------------------------------------- |
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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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|
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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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|
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// step to next |
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m_numscrollsteps++; |
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|
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// do the scrolling |
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|
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if (m_webView.pageScrollHandler() && scrollingView) { |
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|
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TPoint newpos; |
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|
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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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|
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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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|
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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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|
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After(KScrollIntervalTimeout); |
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} |
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} |
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|
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// End of File |