--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/webengine/osswebengine/webkit/s60/webview/WebPagePinchZoomHandler.cpp	Tue Feb 02 00:56:45 2010 +0200
@@ -0,0 +1,242 @@
+/*
+* 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:   
+*
+*/
+
+
+// INCLUDE FILES
+#include <../bidi.h>
+#include "WebPagePinchZoomHandler.h"
+#include "WebView.h"
+
+
+const int KBitmapUpdateTimeout  = 100*1000;
+const int KPinchExitWaitTimeout = 300*1000;
+
+const int KPinchZoomStepSizeSmall  = 3;
+const int KPinchZoomStepSizeMedium = 4;
+const int KPinchZoomStepSizeLarge  = 5;
+const int KMinPinchFactor = 1;
+
+int pinchBitmapUpdateTimerCb( void* ptr );
+int pinchExitWaitTimerCb( void* ptr );
+
+
+// ============================ MEMBER FUNCTIONS ===============================
+
+// -----------------------------------------------------------------------------
+// WebPagePinchZoomHandler::NewL
+// The two-phase Symbian constructor
+// -----------------------------------------------------------------------------
+//
+WebPagePinchZoomHandler* WebPagePinchZoomHandler::NewL(WebView* webView)
+{
+    WebPagePinchZoomHandler* self = new (ELeave) WebPagePinchZoomHandler(webView);
+    CleanupStack::PushL(self);
+    self->constructL();
+    CleanupStack::Pop(); //self
+    return self;
+}
+
+// -----------------------------------------------------------------------------
+// WebPagePinchZoomHandler::WebPointerEventHandler
+// C++ default constructor
+//
+// -----------------------------------------------------------------------------
+//
+WebPagePinchZoomHandler::WebPagePinchZoomHandler(WebView* webView)
+: m_webView(webView)
+, m_zoomOutBaseLevel(0)
+, m_pinchCenterSet(false)
+, m_zoomStepSize(0)
+, m_pinchActive(false)
+, m_pinchCenter(0,0)
+{
+}
+
+// -----------------------------------------------------------------------------
+// WebPagePinchZoomHandler::constructL
+// The constructor that can contain code that might leave.
+// -----------------------------------------------------------------------------
+//
+void WebPagePinchZoomHandler::constructL()
+{
+    m_bitmapUpdateTimer = CPeriodic::NewL(CActive::EPriorityHigh);
+    m_pinchExitWaitTimer = CPeriodic::NewL(CActive::EPriorityHigh);
+}
+
+// -----------------------------------------------------------------------------
+// WebPagePinchZoomHandler::~WebPagePinchZoomHandler
+// -----------------------------------------------------------------------------
+WebPagePinchZoomHandler::~WebPagePinchZoomHandler()
+{
+    if (m_bitmapUpdateTimer->IsActive())
+        m_bitmapUpdateTimer->Cancel();
+    delete m_bitmapUpdateTimer;
+    
+    if (m_pinchExitWaitTimer->IsActive()) 
+        m_pinchExitWaitTimer->Cancel();
+    delete m_pinchExitWaitTimer;
+
+}
+
+// -----------------------------------------------------------------------------
+// getPinchZoomStepSize
+// -----------------------------------------------------------------------------
+TInt WebPagePinchZoomHandler::getPinchZoomStepSize()
+{
+    TInt zoomStepSize = 0;
+
+    TInt absPinchFactor = Abs (m_pinchFactor);
+    if (absPinchFactor == 0)
+        return zoomStepSize;
+    
+    if ( absPinchFactor >= KMinPinchFactor  &&  absPinchFactor <= 10 ) {
+        zoomStepSize = KPinchZoomStepSizeSmall;
+    }    
+    else if ( absPinchFactor > 10 && absPinchFactor <= 20 ) {
+        zoomStepSize = KPinchZoomStepSizeMedium;
+    }  
+    else if ( absPinchFactor > 20 ) {
+        zoomStepSize = KPinchZoomStepSizeLarge;
+    }
+
+    return (m_pinchFactor/absPinchFactor) * zoomStepSize; 
+}
+
+// -----------------------------------------------------------------------------
+// handlePinchGestureEventL
+// -----------------------------------------------------------------------------
+void WebPagePinchZoomHandler::handlePinchGestureEventL(const TStmGestureEvent& aGesture)
+{
+    if(aGesture.GestureState() == EGestureEnter) {
+        m_pinchActive = true;
+        handlePinchGestureL(aGesture);
+    }
+    else {
+        m_pinchActive = false;
+        handlePinchGestureExitL(aGesture);
+    }
+
+}
+
+// -----------------------------------------------------------------------------
+// handlePinchGestureL
+// -----------------------------------------------------------------------------
+void WebPagePinchZoomHandler::handlePinchGestureL(const TStmGestureEvent& aGesture)
+{
+
+    m_pinchFactor = aGesture.Details();
+    TInt zoomValue = 0;
+    TInt currentZoom = m_webView->zoomLevel();
+    TInt zoomStepSize = getPinchZoomStepSize();
+
+    if (zoomStepSize == 0)
+        return;
+
+    zoomValue = currentZoom + zoomStepSize;
+    if (m_zoomStepSize > 0 && zoomStepSize < 0)  m_zoomOutBaseLevel = currentZoom / 2;
+    
+    m_zoomStepSize = zoomStepSize;
+
+    if(zoomValue >= m_webView->minZoomLevel() && zoomValue <= m_webView->maxZoomLevel()) {
+        if (!m_pinchCenterSet) {
+            TPoint pinchCenter = aGesture.PinchEndPos() + aGesture.CurrentPos(); 
+            m_pinchCenter.iX = pinchCenter.iX / 2;
+            m_pinchCenter.iY = pinchCenter.iY / 2;
+            m_pinchCenterSet = true;
+            if (zoomStepSize < 0)   m_zoomOutBaseLevel = currentZoom / 2;  
+        }
+        if (!(zoomStepSize < 0 && zoomValue < m_zoomOutBaseLevel))
+            setZoomLevel(zoomValue);
+
+    }
+}
+
+// -----------------------------------------------------------------------------
+// handlePinchGestureExitL
+// -----------------------------------------------------------------------------
+void WebPagePinchZoomHandler::handlePinchGestureExitL(const TStmGestureEvent& aGesture)
+{
+    m_zoomOutBaseLevel  = 0;
+    m_zoomStepSize = 0;
+    m_pinchCenterSet = false;
+    if (!m_bitmapUpdateTimer->IsActive()) 
+        m_bitmapUpdateTimer->Start( KBitmapUpdateTimeout,KBitmapUpdateTimeout,TCallBack(&pinchBitmapUpdateTimerCb,this));
+    
+    if (!m_pinchExitWaitTimer->IsActive()) 
+        m_pinchExitWaitTimer->Start( KPinchExitWaitTimeout,0,TCallBack(&pinchExitWaitTimerCb,this));
+    
+}
+
+// -----------------------------------------------------------------------------
+// setZoomLevel
+// -----------------------------------------------------------------------------
+void WebPagePinchZoomHandler::setZoomLevel(int zoomLevel)
+{
+    m_webView->setPinchBitmapZoomLevel(zoomLevel);
+}
+
+// -----------------------------------------------------------------------------
+// isPinchActive
+// -----------------------------------------------------------------------------
+TBool WebPagePinchZoomHandler::isPinchActive()
+{
+  bool pinchActive = false;
+  if (m_pinchActive == true || m_pinchExitWaitTimer->IsActive())
+      pinchActive = true;
+  
+  return pinchActive;
+
+}
+
+// -----------------------------------------------------------------------------
+// updateBitmap
+// -----------------------------------------------------------------------------
+void WebPagePinchZoomHandler::updateBitmap(void)
+{
+    m_bitmapUpdateTimer->Cancel();
+    m_webView->restoreZoomLevel(m_webView->scalingFactor());
+}
+
+// -----------------------------------------------------------------------------
+// handlepinchExitWaitTimer
+// -----------------------------------------------------------------------------
+void WebPagePinchZoomHandler::handlepinchExitWaitTimer(void)
+{
+    m_pinchExitWaitTimer->Cancel();
+}
+
+// -----------------------------------------------------------------------------
+// pinchBitmapUpdateTimerCb
+// -----------------------------------------------------------------------------
+int pinchBitmapUpdateTimerCb(void* ptr)
+{
+    ((WebPagePinchZoomHandler*)ptr)->updateBitmap();
+    return 0;
+}
+
+// -----------------------------------------------------------------------------
+// pinchExitWaitTimerCb
+// -----------------------------------------------------------------------------
+int pinchExitWaitTimerCb(void* ptr)
+{
+    ((WebPagePinchZoomHandler*)ptr)->handlepinchExitWaitTimer();
+    return 0;
+}
+
+//  End of File
+
+