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1 /* |
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2 * Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). |
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3 * All rights reserved. |
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4 * This component and the accompanying materials are made available |
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5 * under the terms of "Eclipse Public License v1.0" |
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6 * which accompanies this distribution, and is available |
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7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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8 * |
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9 * Initial Contributors: |
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10 * Nokia Corporation - initial contribution. |
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11 * |
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12 * Contributors: |
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13 * |
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14 * Description: AknPhysics flick tracker |
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15 * |
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16 */ |
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17 |
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18 #include <e32debug.h> |
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19 |
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20 #include "aknphysicsconstants.h" |
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21 #include "aknphysicsflicktracker.h" |
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22 #include "aknphysicsparameterprovider.h" |
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23 |
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24 const TInt KDistanceFactor( 1000000 ); |
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25 const TInt KSpeedUpIncrease( 500 ); |
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26 const TInt KIgnoreSpeedUpEvents( 3 ); |
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27 |
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28 // ======== MEMBER FUNCTIONS ======== |
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29 |
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30 // --------------------------------------------------------------------------- |
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31 // CAknPhysicsFlickTracker::NewL |
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32 // --------------------------------------------------------------------------- |
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33 // |
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34 CAknPhysicsFlickTracker* CAknPhysicsFlickTracker::NewL( |
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35 CAknPhysicsParameterProvider* aProvider ) |
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36 { |
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37 CAknPhysicsFlickTracker* self = |
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38 CAknPhysicsFlickTracker::NewLC( aProvider ); |
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39 CleanupStack::Pop( self ); |
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40 return self; |
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41 } |
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42 |
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43 |
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44 // --------------------------------------------------------------------------- |
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45 // CAknPhysicsFlickTracker::NewLC |
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46 // --------------------------------------------------------------------------- |
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47 // |
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48 CAknPhysicsFlickTracker* CAknPhysicsFlickTracker::NewLC( |
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49 CAknPhysicsParameterProvider* aProvider ) |
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50 { |
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51 CAknPhysicsFlickTracker* self |
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52 = new ( ELeave ) CAknPhysicsFlickTracker( aProvider ); |
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53 CleanupStack::PushL( self ); |
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54 self->ConstructL(); |
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55 return self; |
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56 } |
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57 |
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58 |
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59 // --------------------------------------------------------------------------- |
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60 // CAknPhysicsFlickTracker::~CAknPhysicsDragObserver |
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61 // --------------------------------------------------------------------------- |
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62 // |
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63 CAknPhysicsFlickTracker::~CAknPhysicsFlickTracker() |
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64 { |
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65 } |
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66 |
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67 |
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68 // --------------------------------------------------------------------------- |
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69 // CAknPhysicsFlickTracker::InitTracker |
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70 // --------------------------------------------------------------------------- |
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71 // |
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72 void CAknPhysicsFlickTracker::InitTracker( const TInt& aCoordinate ) |
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73 { |
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74 iDirection = EDirectionNone; |
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75 iCoordinate = aCoordinate; |
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76 InitFlickData( iDirectionData, aCoordinate ); |
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77 InitFlickData( iNormalStartData, aCoordinate ); |
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78 InitFlickData( iSpeedUpData, aCoordinate ); |
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79 InitFlickData( iSpeedUpStartData, aCoordinate ); |
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80 iLastDragTime.HomeTime(); |
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81 iChangeRegistered = EFalse; |
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82 iSpeedUpRegistered = EFalse; |
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83 iLastDragSpeed = 0; |
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84 iIgnoredEvents = 0; |
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85 } |
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86 |
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87 |
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88 // --------------------------------------------------------------------------- |
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89 // CAknPhysicsFlickTracker::DragChanged |
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90 // --------------------------------------------------------------------------- |
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91 // |
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92 void CAknPhysicsFlickTracker::DragChanged( const TInt& aCoordinate ) |
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93 { |
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94 TBool changed( EFalse ); |
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95 TBool registered( EFalse ); |
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96 |
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97 // First check if drag direction has changed |
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98 TDirection direction( EDirectionNone ); |
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99 if ( aCoordinate > iCoordinate |
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100 && iDirection != EDirectionForward ) |
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101 { |
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102 direction = EDirectionForward; |
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103 } |
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104 else if ( aCoordinate < iCoordinate |
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105 && iDirection != EDirectionBackward ) |
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106 { |
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107 direction = EDirectionBackward; |
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108 } |
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109 |
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110 if ( direction != EDirectionNone ) |
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111 { |
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112 // Direction change only after first direction is saved |
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113 if ( iDirection != EDirectionNone ) |
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114 { |
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115 iDirectionData.iCoordinate = aCoordinate; |
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116 iDirectionData.iTime.HomeTime(); |
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117 iChangeRegistered = EFalse; |
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118 changed = ETrue; |
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119 } |
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120 iDirection = direction; |
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121 } |
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122 |
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123 if ( !iChangeRegistered && iDirectionData.iCoordinate != iNormalStartData.iCoordinate ) |
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124 { |
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125 TInt distance( iDirectionData.iCoordinate - aCoordinate ); |
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126 // Distance from direction change position has exceeded threshold |
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127 // - save the direction changed position as new start position |
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128 if ( Threshold() && Abs( distance ) > Threshold() ) |
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129 { |
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130 iNormalStartData = iDirectionData; |
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131 iChangeRegistered = ETrue; |
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132 registered = ETrue; |
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133 } |
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134 } |
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135 |
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136 // No speed changes are registered when direction has changed |
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137 if ( !changed && !registered ) |
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138 { |
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139 SpeedChanged( aCoordinate ); |
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140 } |
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141 // If direction was changed - reset speed change data |
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142 else if ( registered ) |
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143 { |
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144 iSpeedUpData = iNormalStartData; |
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145 iSpeedUpStartData = iNormalStartData; |
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146 iSpeedUpRegistered = EFalse; |
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147 iIgnoredEvents = 0; |
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148 iLastDragSpeed = 0; |
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149 } |
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150 |
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151 iCoordinate = aCoordinate; |
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152 iLastDragTime.HomeTime(); |
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153 } |
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154 |
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155 |
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156 // --------------------------------------------------------------------------- |
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157 // CAknPhysicsFlickTracker::FlickStartCoordinate |
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158 // --------------------------------------------------------------------------- |
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159 // |
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160 TInt CAknPhysicsFlickTracker::FlickStartCoordinate() const |
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161 { |
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162 // If move time from flick start point has exceeded flick maximum duration, |
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163 // check if speed has increased and use speed-up position parameters |
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164 if ( NormalFlickMoveTime() > KFlickMaxDuration ) |
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165 { |
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166 return iSpeedUpStartData.iCoordinate; |
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167 } |
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168 return iNormalStartData.iCoordinate; |
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169 } |
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170 |
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171 |
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172 // --------------------------------------------------------------------------- |
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173 // CAknPhysicsFlickTracker::FlickMoveTime |
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174 // --------------------------------------------------------------------------- |
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175 // |
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176 TInt CAknPhysicsFlickTracker::FlickMoveTime() const |
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177 { |
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178 // If move time from flick start point has exceeded flick maximum duration, |
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179 // check if speed has increased and use speed-up position parameters |
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180 if ( NormalFlickMoveTime() > KFlickMaxDuration ) |
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181 { |
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182 TTime now; |
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183 now.HomeTime(); |
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184 return now.MicroSecondsFrom( iSpeedUpStartData.iTime ).Int64(); |
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185 } |
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186 return NormalFlickMoveTime(); |
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187 } |
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188 |
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189 |
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190 // --------------------------------------------------------------------------- |
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191 // CAknPhysicsFlickTracker::CAknPhysicsFlickTracker |
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192 // --------------------------------------------------------------------------- |
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193 // |
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194 CAknPhysicsFlickTracker::CAknPhysicsFlickTracker( |
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195 CAknPhysicsParameterProvider* aProvider ) |
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196 : |
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197 iDirection( EDirectionNone ), |
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198 iProvider( aProvider ) |
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199 { |
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200 } |
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201 |
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202 |
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203 // --------------------------------------------------------------------------- |
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204 // CAknPhysicsFlickTracker::ConstructL |
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205 // --------------------------------------------------------------------------- |
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206 // |
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207 void CAknPhysicsFlickTracker::ConstructL() |
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208 { |
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209 } |
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210 |
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211 |
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212 // --------------------------------------------------------------------------- |
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213 // CAknPhysicsFlickTracker::SpeedChanged |
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214 // --------------------------------------------------------------------------- |
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215 // |
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216 void CAknPhysicsFlickTracker::SpeedChanged( const TInt& aCoordinate ) |
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217 { |
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218 TInt newSpeed( DragSpeed( aCoordinate ) ); |
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219 |
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220 // iIgnoreEvents keeps track of such events which speedup positions should |
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221 // be ignored. This is done to calculate speed-up parameters from the first |
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222 // successive speed-up positions |
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223 if ( iIgnoredEvents > 0 ) |
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224 { |
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225 iIgnoredEvents--; |
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226 } |
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227 |
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228 // New speed exceeds the speed threshold - save speed up data |
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229 if ( iIgnoredEvents == 0 |
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230 && iLastDragSpeed && ( newSpeed - iLastDragSpeed > KSpeedUpIncrease ) |
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231 && ( ( iDirection == EDirectionForward && aCoordinate > iCoordinate ) |
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232 || ( iDirection == EDirectionBackward && aCoordinate < iCoordinate ) ) ) |
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233 { |
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234 iSpeedUpData.iCoordinate = iCoordinate; |
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235 iSpeedUpData.iTime = iLastDragTime; |
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236 iSpeedUpRegistered = EFalse; |
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237 iIgnoredEvents = KIgnoreSpeedUpEvents; |
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238 iSpeedUpStartData = iNormalStartData; |
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239 } |
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240 |
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241 // Speed-up hasn't yet been registered - save speed up start data if the |
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242 // drag distance exceeds threshold |
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243 if ( !iSpeedUpRegistered && iSpeedUpData.iCoordinate != iSpeedUpStartData.iCoordinate ) |
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244 { |
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245 TInt distance( iSpeedUpData.iCoordinate - aCoordinate ); |
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246 // Distance from direction change position has exceeded threshold |
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247 // - save the direction changed position as new start position |
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248 if ( Threshold() && Abs( distance ) > Threshold() ) |
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249 { |
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250 iSpeedUpStartData = iSpeedUpData; |
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251 iSpeedUpRegistered = ETrue; |
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252 } |
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253 } |
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254 iLastDragSpeed = newSpeed; |
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255 } |
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256 |
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257 // --------------------------------------------------------------------------- |
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258 // CAknPhysicsFlickTracker::Threshold |
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259 // --------------------------------------------------------------------------- |
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260 // |
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261 TInt CAknPhysicsFlickTracker::Threshold() |
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262 { |
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263 if ( iProvider ) |
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264 { |
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265 return iProvider->DragThreshold(); |
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266 } |
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267 return 0; |
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268 } |
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269 |
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270 |
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271 // --------------------------------------------------------------------------- |
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272 // CAknPhysicsFlickTracker::DragSpeed |
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273 // --------------------------------------------------------------------------- |
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274 // |
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275 TInt CAknPhysicsFlickTracker::DragSpeed( const TInt& aNewCoordinate ) |
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276 { |
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277 TTime now; |
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278 now.HomeTime(); |
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279 TInt moveTime( now.MicroSecondsFrom( iLastDragTime ).Int64() ); |
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280 TInt distance( Abs( iCoordinate - aNewCoordinate ) * KDistanceFactor ); |
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281 if ( moveTime ) |
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282 { |
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283 return ( distance / moveTime ); |
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284 } |
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285 return 0; |
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286 } |
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287 |
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288 |
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289 // --------------------------------------------------------------------------- |
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290 // CAknPhysicsFlickTracker::InitFlickData |
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291 // --------------------------------------------------------------------------- |
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292 // |
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293 void CAknPhysicsFlickTracker::InitFlickData( TAknPhysicsTrackerData& aData, |
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294 const TInt& aCoordinate ) |
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295 { |
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296 aData.iCoordinate = aCoordinate; |
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297 aData.iTime.HomeTime(); |
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298 } |
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299 |
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300 |
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301 // --------------------------------------------------------------------------- |
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302 // CAknPhysicsFlickTracker::NormalFlickMoveTime |
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303 // --------------------------------------------------------------------------- |
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304 // |
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305 TInt CAknPhysicsFlickTracker::NormalFlickMoveTime() const |
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306 { |
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307 TTime now; |
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308 now.HomeTime(); |
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309 return now.MicroSecondsFrom( iNormalStartData.iTime ).Int64(); |
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310 } |