emailcontacts/contactactionmenu/src/tfsccontactactionmenutimedvalue.cpp
changeset 0 8466d47a6819
equal deleted inserted replaced
-1:000000000000 0:8466d47a6819
       
     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 "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:  Implementation of the class TFscContactActionMenuTimedValue.
       
    15 *
       
    16 */
       
    17 
       
    18 
       
    19 // INCUDES
       
    20 #include "emailtrace.h"
       
    21 #include "tfsccontactactionmenutimedvalue.h"
       
    22 
       
    23 // CONSTS
       
    24 const TReal KMilliSecondsInSecond = 1000.0;
       
    25 
       
    26 // ======== LOCAL FUNCTIONS ========
       
    27 
       
    28 // ======== MEMBER FUNCTIONS ========
       
    29 
       
    30 
       
    31 // ---------------------------------------------------------------------------
       
    32 // TFscContactActionMenuTimedValue::TFscContactActionMenuTimedValue
       
    33 // ---------------------------------------------------------------------------
       
    34 //
       
    35 TFscContactActionMenuTimedValue::TFscContactActionMenuTimedValue(
       
    36     TReal32 aInitialValue ) : iStartValue( aInitialValue )
       
    37     {
       
    38     FUNC_LOG;
       
    39     }
       
    40 
       
    41 // ---------------------------------------------------------------------------
       
    42 // TFscContactActionMenuTimedValue::TFscContactActionMenuTimedValue
       
    43 // ---------------------------------------------------------------------------
       
    44 //
       
    45 void TFscContactActionMenuTimedValue::Set( 
       
    46     TReal32 aTargetValue, TInt aTimeMs )
       
    47     {
       
    48     FUNC_LOG;
       
    49     if( aTimeMs <= 0 )
       
    50         {
       
    51         iInternalState &= ~EFlagInterpolating;
       
    52         iInternalState |= EFlagChanged;
       
    53         iStartValue = aTargetValue;
       
    54         iTargetValue = aTargetValue;
       
    55         return;
       
    56         }
       
    57         
       
    58     if( iInternalState & EFlagInterpolating )
       
    59         {
       
    60         iStartValue = Now();
       
    61         }
       
    62     else
       
    63         {
       
    64         if( iStartValue == aTargetValue )
       
    65             {
       
    66             // This is the current value of the timed value, and it won't
       
    67             // change, so we are already at the target.
       
    68             return;
       
    69             }
       
    70         }        
       
    71 
       
    72     // If the difference between the current value and the target value
       
    73     // is insignificant, no interpolation is done (it would be subject
       
    74     // to round-off problems).
       
    75     const TReal32 KEpsilon = .0001;
       
    76     TReal32 delta = aTargetValue - iStartValue;
       
    77     if( Abs(delta) < KEpsilon )
       
    78         {
       
    79         iStartValue = aTargetValue;
       
    80         iTargetValue = aTargetValue;
       
    81         iInternalState &= ~EFlagInterpolating;
       
    82         iInternalState |= EFlagChanged;
       
    83         return;
       
    84         }
       
    85 
       
    86     iStartTime = Time();
       
    87     
       
    88     // Target time is an offset to the current time.
       
    89     iEndTime = iStartTime + aTimeMs;
       
    90     iTargetValue = aTargetValue;
       
    91     iInternalState |= EFlagChanged | EFlagInterpolating;
       
    92 
       
    93     }
       
    94 
       
    95 // ---------------------------------------------------------------------------
       
    96 // TFscContactActionMenuTimedValue::SetWithSpeed
       
    97 // ---------------------------------------------------------------------------
       
    98 //
       
    99  void TFscContactActionMenuTimedValue::SetWithSpeed( 
       
   100     TReal32 aTargetValue, TInt aUnitsPerSecond )
       
   101     {
       
   102     FUNC_LOG;
       
   103     TReal32 delta = Now() - aTargetValue;
       
   104     if( delta == 0 || aUnitsPerSecond <= 0 )
       
   105         {
       
   106         // Already there.
       
   107         Set( aTargetValue );
       
   108         return;
       
   109         }
       
   110     
       
   111     delta = Abs(delta);
       
   112     Set( aTargetValue, ( TInt ) ( ( delta / aUnitsPerSecond ) * KMilliSecondsInSecond ) );
       
   113     }
       
   114 
       
   115 // ---------------------------------------------------------------------------
       
   116 // TFscContactActionMenuTimedValue::Now
       
   117 // ---------------------------------------------------------------------------
       
   118 //
       
   119  TReal TFscContactActionMenuTimedValue::Now()
       
   120     {
       
   121     FUNC_LOG;
       
   122     
       
   123     if( ( iInternalState & EFlagInterpolating ) && iEndTime > iStartTime )
       
   124         {
       
   125         iInternalState |= EFlagChanged;
       
   126         
       
   127         TInt duration = iEndTime - iStartTime; // Convert from TInt64 -> TInt
       
   128         TInt elapsed = Time() - iStartTime; // Convert from TInt64 -> TInt
       
   129         
       
   130         if( elapsed > duration )
       
   131             {
       
   132             // We have reached the destination.
       
   133             iStartValue = iTargetValue;
       
   134             iStartTime = iEndTime;
       
   135             iInternalState &= ~EFlagInterpolating;
       
   136             return iStartValue;
       
   137             }
       
   138         
       
   139         const TInt fixt = FixDiv( elapsed, duration );
       
   140         TReal32 t = FixToFloat( fixt );
       
   141         TReal result = ( iStartValue * ( 1 - t ) + iTargetValue * t );
       
   142         return result;
       
   143         }
       
   144     else
       
   145         {
       
   146         if( iInternalState & EFlagInterpolating )
       
   147             {
       
   148             iInternalState |= EFlagChanged;
       
   149             iInternalState &= ~EFlagInterpolating;
       
   150             }
       
   151         return iStartValue;
       
   152         }
       
   153 
       
   154     }
       
   155 
       
   156 // ---------------------------------------------------------------------------
       
   157 // TFscContactActionMenuTimedValue::Target
       
   158 // ---------------------------------------------------------------------------
       
   159 //
       
   160 TReal TFscContactActionMenuTimedValue::Target()
       
   161     {
       
   162     FUNC_LOG;
       
   163     return iTargetValue;
       
   164     }
       
   165 
       
   166 // ---------------------------------------------------------------------------
       
   167 // TFscContactActionMenuTimedValue::Interpolating
       
   168 // ---------------------------------------------------------------------------
       
   169 //
       
   170 TBool TFscContactActionMenuTimedValue::Interpolating()
       
   171     {
       
   172     FUNC_LOG;
       
   173     return ( ( iInternalState & EFlagInterpolating ) != 0 );
       
   174     }
       
   175 
       
   176 // ---------------------------------------------------------------------------
       
   177 // TFscContactActionMenuTimedValue::FixDiv
       
   178 // ---------------------------------------------------------------------------
       
   179 //
       
   180 TInt TFscContactActionMenuTimedValue::FixDiv( TInt aVal1, TInt aVal2 )
       
   181     {
       
   182     FUNC_LOG;
       
   183     TUint64 temp = aVal1;
       
   184     temp <<= 16;
       
   185     TInt result = 0;
       
   186     if ( aVal2 != 0 )
       
   187         {
       
   188         result = TInt( temp / aVal2 );
       
   189         }
       
   190     return result;
       
   191     };
       
   192 
       
   193 // ---------------------------------------------------------------------------
       
   194 // TFscContactActionMenuTimedValue::FixToFloat
       
   195 // ---------------------------------------------------------------------------
       
   196 //
       
   197 TReal32 TFscContactActionMenuTimedValue::FixToFloat( TInt aVal )
       
   198     {
       
   199     FUNC_LOG;
       
   200     TReal result = TReal32( ( TReal32( aVal ) ) / 65536.0f );
       
   201     return result;
       
   202     }
       
   203 
       
   204 // ---------------------------------------------------------------------------
       
   205 // TFscContactActionMenuTimedValue::Time
       
   206 // ---------------------------------------------------------------------------
       
   207 //
       
   208 TInt64 TFscContactActionMenuTimedValue::Time() const
       
   209     {
       
   210     FUNC_LOG;
       
   211     TTime curTime;
       
   212     curTime.UniversalTime();
       
   213     TTimeIntervalMicroSeconds interval = 
       
   214         curTime.MicroSecondsFrom( TTime( 0 ) );
       
   215         
       
   216     return interval.Int64() / KMilliSecondsInSecond;
       
   217     }
       
   218