1 /*

     2 * Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies).

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of the License "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description:   Handles Web Scrolling Deceleration

    15 *

    16 */

    17 

    18 

    19 #ifndef WEBSCROLLINGDECELERATORGH_H

    20 #define WEBSCROLLINGDECELERATORGH_H

    21 

    22 //  INCLUDES

    23 #include <e32base.h>

    24 #include <coedef.h>

    25 #include <w32std.h>

    26 #include <rt_gestureobserver.h>

    27 

    28 // MACROS

    29 

    30 // FORWARD DECLARATIONS

    31 class WebView;

    32 class WebScrollbarDrawer;

    33 

    34 // CLASS DECLARATION

    35 class WebScrollingDeceleratorGH: public CBase

    36     {

    37     public:  // Constructor and destructor

    38 

    39         /**

    40         * Two-phased constructor.

    41         */

    42         static WebScrollingDeceleratorGH* NewL(WebView& webView);

    43 

    44         /**

    45         * Destructor.

    46         */

    47         virtual ~WebScrollingDeceleratorGH();

    48 

    49     private:

    50 

    51         /**

    52         * C++ default constructor.

    53         */

    54         WebScrollingDeceleratorGH(WebView& webView);

    55 

    56         /**

    57         * By default Symbian 2nd phase constructor is private.

    58         */

    59         void ConstructL();

    60 

    61     public: // Main functions

    62         

    63         void startDecel(RT_GestureHelper::TRealPoint& speed, WebScrollbarDrawer* scrollbarDrawer);

    64         

    65         void cancelDecel();

    66         

    67         void scroll();

    68         

    69         int getDecceleration();

    70         

    71     private:    // Data

    72 

    73         // Pointer to owning view

    74         WebView& m_webView; // not owned

    75 

    76 	// scroll delta

    77         TPoint m_scrolldelta;

    78         

    79         // count of number of scoll steps

    80         TUint m_numscrollsteps;

    81         

    82         // decelator status flag

    83         bool m_decelelatorSwitch;

    84         

    85         //normalized current position to minimize rounding error

    86         TPoint m_normalizedCurrentPosition;

    87         

    88         RT_GestureHelper::TRealPoint m_initSpeed;

    89         

    90         CPeriodic*  m_decelTimer;

    91         

    92         TPoint m_lastPos;

    93         

    94         TPoint m_startPos;

    95         

    96         WebScrollbarDrawer* m_scrollbarDrawer;

    97     };

    98 

    99 

   100 

   101 #endif      // WEBSCROLLINGDECELERATOR_GH_H

   102 

   103 // End of File