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 WEBSCROLLINGDECELERATOR_H

    20 #define WEBSCROLLINGDECELERATOR_H

    21 

    22 //  INCLUDES

    23 #include <e32base.h>

    24 #include <coedef.h>

    25 #include <w32std.h>

    26 

    27 // MACROS

    28 

    29 // FORWARD DECLARATIONS

    30 class WebView;

    31 

    32 // CLASS DECLARATION

    33 class WebScrollingDecelerator: public CTimer

    34     {

    35     public:  // Constructor and destructor

    36 

    37         /**

    38         * Two-phased constructor.

    39         */

    40         static WebScrollingDecelerator* NewL(WebView& webView);

    41 

    42         /**

    43         * Destructor.

    44         */

    45         virtual ~WebScrollingDecelerator();

    46 

    47     private:

    48 

    49         /**

    50         * C++ default constructor.

    51         */

    52         WebScrollingDecelerator(WebView& webView);

    53 

    54         /**

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

    56         */

    57         void ConstructL();

    58 

    59     public: // Main functions

    60         /**

    61         * @since 5.0

    62         * param pointerEvent

    63         * return void

    64         */

    65         void updatePos();

    66         

    67         /**

    68         * @since 5.0

    69         * param none

    70         * return void

    71         */

    72         void startDecelL();

    73         

    74         /**

    75         * @since 5.0

    76         * param none

    77         * return void

    78         */

    79         void stopDecelL() { m_decelelatorSwitch = false; Cancel(); }

    80         

    81         /**

    82         * @since 5.0

    83         * param none

    84         * return void

    85         */

    86         void RunL();

    87         

    88     private:    // Data

    89 

    90         // Pointer to owning view

    91         WebView& m_webView; // not owned

    92         

    93         // Track pointer drag events

    94         RArray<const TPoint> m_dragPosition;

    95         

    96         // scroll delta

    97         TPoint m_scrolldelta;

    98         

    99         // count of number of scoll steps

   100         TUint m_numscrollsteps;

   101         

   102         // decelator status flag

   103         bool m_decelelatorSwitch;

   104         

   105         //normalized current position to minimize rounding error

   106         TPoint m_normalizedCurrentPosition;

   107         

   108     };

   109 

   110 #endif      // WEBSCROLLINGDECELERATOR_H

   111 

   112 // End of File