author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 31 Aug 2010 16:17:46 +0300 | |
branch | RCL_3 |
changeset 93 | 79859ed3eea9 |
parent 91 | 30342f40acbf |
child 94 | 919f36ff910f |
permissions | -rw-r--r-- |
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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 "WebScrollingDeceleratorGH.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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#include "WebScrollbarDrawer.h" |
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#include "WebKitLogger.h" |
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using namespace RT_GestureHelper; |
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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 = 60000; // scroll timer interval in microseconds |
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const float KDecceleration = -700.0; |
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int decelTimerCB(TAny* ptr); |
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// ============================ MEMBER FUNCTIONS =============================== |
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// ----------------------------------------------------------------------------- |
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// WebScrollingDeceleratorGH::NewL |
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// The two-phase Symbian constructor |
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// ----------------------------------------------------------------------------- |
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// |
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WebScrollingDeceleratorGH* WebScrollingDeceleratorGH::NewL(WebView& webView) |
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{ |
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WebScrollingDeceleratorGH* self = new (ELeave) WebScrollingDeceleratorGH(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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// WebScrollingDeceleratorGH::WebScrollingDeceleratorGH |
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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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WebScrollingDeceleratorGH::WebScrollingDeceleratorGH(WebView& webView) |
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: m_webView( webView ) |
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{ |
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} |
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// ----------------------------------------------------------------------------- |
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// WebScrollingDeceleratorGH::ConstructL |
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// ----------------------------------------------------------------------------- |
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void WebScrollingDeceleratorGH::ConstructL() |
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{ |
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m_decelTimer = CPeriodic::NewL(CActive::EPriorityStandard); |
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} |
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// ----------------------------------------------------------------------------- |
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// Destructor |
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// ----------------------------------------------------------------------------- |
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WebScrollingDeceleratorGH::~WebScrollingDeceleratorGH() |
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{ |
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delete m_decelTimer; |
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} |
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int WebScrollingDeceleratorGH::getDecceleration() |
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{ |
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return KDecceleration; |
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} |
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int decelTimerCB(TAny* ptr) |
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{ |
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(static_cast<WebScrollingDeceleratorGH*>(ptr))->scroll(); |
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return false; |
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} |
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void WebScrollingDeceleratorGH::cancelDecel() |
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{ |
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m_decelelatorSwitch = false; |
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if (m_decelTimer->IsActive()) { |
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m_decelTimer->Cancel(); |
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} |
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} |
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void WebScrollingDeceleratorGH::startDecel(TRealPoint& speed, WebScrollbarDrawer* scrollbarDrawer) |
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{ |
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m_decelelatorSwitch = true; |
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m_scrollbarDrawer = scrollbarDrawer; |
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m_initSpeed.iX = (-1) * speed.iX; |
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m_initSpeed.iY = (-1) * speed.iY; |
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|
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m_numscrollsteps = 0; |
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if (m_decelTimer->IsActive()) { |
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m_decelTimer->Cancel(); |
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} |
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|
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WebFrameView* scrollingView = m_webView.pageScrollHandler()->currentScrollingFrameView(); |
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if (scrollingView) { |
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m_startPos = scrollingView->contentPos(); |
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m_lastPos = m_startPos; |
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m_decelTimer->Start(0, KScrollIntervalTimeout, |
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TCallBack(&decelTimerCB, this)); |
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} |
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} |
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|
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void WebScrollingDeceleratorGH::scroll() |
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{ |
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if (!m_decelelatorSwitch) return; |
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// X = Vst*t - 0.5*a*(t * t) |
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TPoint dist; |
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TReal32 intervalInSec = static_cast<TReal32>(KScrollIntervalTimeout) / 1000000; |
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TReal32 t = (m_numscrollsteps++) * intervalInSec; |
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TReal32 dx = 0.0; |
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TReal32 dy = 0.0; |
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TReal32 vx = 0.0; |
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TReal32 vy = 0.0; |
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TReal32 accelX = 0.0; |
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TReal32 accelY = 0.0; |
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|
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if (m_initSpeed.iX) { |
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accelX = (m_initSpeed.iX > 0) ? KDecceleration : (-1) * KDecceleration; |
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vx = m_initSpeed.iX + accelX * t; |
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dx = m_initSpeed.iX * t + 0.5 * accelX * (t * t); |
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} |
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|
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if (m_initSpeed.iY) { |
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accelY = (m_initSpeed.iY > 0) ? KDecceleration : (-1) * KDecceleration; |
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vy = m_initSpeed.iY + accelY * t; |
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dy = m_initSpeed.iY * t + 0.5 * accelY * (t * t); |
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} |
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|
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dist.SetXY(static_cast<TInt>(dx), static_cast<TInt>(dy)); |
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|
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WebFrameView* scrollingView = m_webView.pageScrollHandler()->currentScrollingFrameView(); |
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TPoint cpos = scrollingView->contentPos(); |
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dist = scrollingView->toDocCoords(dist); |
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TPoint pos = m_startPos + dist; |
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|
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WebPageScrollHandler* handler = m_webView.pageScrollHandler(); |
|
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||
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if ((vx * m_initSpeed.iX < 0) || (vy * m_initSpeed.iY < 0) || (vx + vy == 0) || |
|
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(m_numscrollsteps > 1 && !scrollingView->needScroll(pos) && |
|
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!handler->currentScrollingElement())) { |
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if (m_scrollbarDrawer) { |
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m_scrollbarDrawer->fadeScrollbar(); |
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} |
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m_decelTimer->Cancel(); |
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handler->clearScrollingElement(); |
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m_webView.setViewIsScrolling(false); |
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m_webView.toggleRepaintTimer(true); |
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} |
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else { |
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TPoint scrollDelta = pos - m_lastPos; |
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handler->scrollContent(scrollDelta); |
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m_lastPos = pos; |
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} |
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} |
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|
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// End of File |