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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: Pinch touch gesture recognizer. |
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15 * |
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16 */ |
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17 |
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18 #include "akntouchgesturefwdefs.h" |
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19 #include "akntouchgesturefwevent.h" |
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20 #include "akntouchgesturefwpinchrecognizer.h" |
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21 #include "akntouchgesturefwsettings.h" |
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22 |
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23 using namespace AknTouchGestureFw; |
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24 |
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25 // ======== MEMBER FUNCTIONS ======== |
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26 |
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27 // --------------------------------------------------------------------------- |
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28 // Two-phased constructor. |
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29 // --------------------------------------------------------------------------- |
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30 // |
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31 CAknTouchGestureFwPinchRecognizer* CAknTouchGestureFwPinchRecognizer::NewL( |
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32 CAknTouchGestureFwRecognitionEngine& aEngine ) |
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33 { |
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34 CAknTouchGestureFwPinchRecognizer* self = |
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35 CAknTouchGestureFwPinchRecognizer::NewLC( aEngine ); |
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36 CleanupStack::Pop( self ); |
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37 return self; |
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38 } |
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39 |
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40 |
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41 // --------------------------------------------------------------------------- |
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42 // Two-phased constructor. |
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43 // --------------------------------------------------------------------------- |
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44 // |
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45 CAknTouchGestureFwPinchRecognizer* CAknTouchGestureFwPinchRecognizer::NewLC( |
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46 CAknTouchGestureFwRecognitionEngine& aEngine ) |
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47 { |
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48 CAknTouchGestureFwPinchRecognizer* self |
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49 = new ( ELeave ) CAknTouchGestureFwPinchRecognizer( aEngine ); |
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50 CleanupStack::PushL( self ); |
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51 return self; |
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52 } |
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53 |
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54 |
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55 // --------------------------------------------------------------------------- |
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56 // Destructor |
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57 // --------------------------------------------------------------------------- |
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58 // |
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59 CAknTouchGestureFwPinchRecognizer::~CAknTouchGestureFwPinchRecognizer() |
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60 { |
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61 } |
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62 |
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63 |
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64 // --------------------------------------------------------------------------- |
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65 // Returns the pinch gesture group. |
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66 // --------------------------------------------------------------------------- |
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67 // |
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68 TAknTouchGestureFwGroup CAknTouchGestureFwPinchRecognizer::GestureGroup() const |
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69 { |
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70 return EAknTouchGestureFwGroupPinch; |
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71 } |
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72 |
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73 |
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74 // --------------------------------------------------------------------------- |
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75 // Cancels the gesture recognition. |
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76 // --------------------------------------------------------------------------- |
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77 // |
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78 void CAknTouchGestureFwPinchRecognizer::CancelRecognizing() |
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79 { |
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80 if ( iContinuousFeedback ) |
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81 { |
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82 StopContinuousFeedback(); |
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83 iContinuousFeedback = EFalse; |
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84 } |
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85 |
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86 if ( iPinchDetected ) |
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87 { |
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88 // We ignore the possible leave in order to ensure that the |
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89 // state gets reset. |
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90 TRAP_IGNORE( SendPinchEventL( EAknTouchGestureFwStop, 0 ) ); |
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91 } |
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92 Reset(); |
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93 } |
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94 |
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95 |
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96 // --------------------------------------------------------------------------- |
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97 // Handles single-touch pointer events. |
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98 // --------------------------------------------------------------------------- |
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99 // |
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100 void CAknTouchGestureFwPinchRecognizer::HandleSinglePointerEventL( |
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101 const TPointerEventData& /*aPointerData*/ ) |
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102 { |
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103 // No single touch event handling in pinch recognizer |
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104 } |
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105 |
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106 |
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107 // --------------------------------------------------------------------------- |
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108 // Handles multi-touch pointer events. |
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109 // --------------------------------------------------------------------------- |
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110 // |
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111 void CAknTouchGestureFwPinchRecognizer::HandleMultiPointerEventL( |
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112 const TPointerEventData& aPointerData, |
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113 const TPoint& aFirstPointerPosition, |
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114 const TPoint& aSecondPointerPosition ) |
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115 { |
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116 // Handle event |
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117 switch ( aPointerData.iPointerEvent.iType ) |
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118 { |
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119 case TPointerEvent::EButton1Down: |
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120 { |
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121 StartMultiRecognizing( |
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122 aFirstPointerPosition, |
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123 aSecondPointerPosition ); |
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124 break; |
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125 } |
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126 |
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127 case TPointerEvent::EDrag: |
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128 { |
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129 MultiRecognizeL( |
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130 aPointerData.iTimeStamp, |
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131 aFirstPointerPosition, |
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132 aSecondPointerPosition ); |
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133 break; |
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134 } |
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135 case TPointerEvent::EButton1Up: |
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136 { |
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137 CompleteMultiRecognizingL( aPointerData.iTimeStamp ); |
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138 break; |
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139 } |
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140 default: |
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141 { |
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142 break; |
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143 } |
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144 } |
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145 } |
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146 |
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147 |
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148 // --------------------------------------------------------------------------- |
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149 // C++ constructor. |
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150 // --------------------------------------------------------------------------- |
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151 // |
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152 CAknTouchGestureFwPinchRecognizer::CAknTouchGestureFwPinchRecognizer( |
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153 CAknTouchGestureFwRecognitionEngine& aEngine ) |
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154 : CAknTouchGestureFwBaseRecognizer( aEngine ) |
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155 { |
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156 Reset(); |
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157 } |
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158 |
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159 |
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160 // --------------------------------------------------------------------------- |
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161 // Starts recognizing the pinch gesture. |
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162 // --------------------------------------------------------------------------- |
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163 // |
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164 void CAknTouchGestureFwPinchRecognizer::StartMultiRecognizing( |
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165 const TPoint& aFirstPointerPos, |
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166 const TPoint& aSecondPointerPos ) |
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167 { |
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168 // Initialize members for multi recognition. |
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169 Reset(); |
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170 |
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171 iPinchRect = CalculateBoundingRect( aFirstPointerPos, aSecondPointerPos ); |
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172 |
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173 TTouchFeedbackType feedbackType( FeedbackType( EAknTouchGestureFwPinch ) ); |
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174 if ( feedbackType ) |
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175 { |
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176 ImmediateFeedback( ETouchFeedbackSensitive, feedbackType ); |
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177 ImmediateFeedback( ETouchFeedbackSensitive, feedbackType ); |
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178 } |
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179 } |
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180 |
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181 |
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182 // --------------------------------------------------------------------------- |
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183 // Continues recognizing the pinch gesture. |
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184 // Called for every drag-event when more than one pointer is down. |
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185 // Threshold handling for pinch is implemented here. |
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186 // --------------------------------------------------------------------------- |
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187 // |
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188 void CAknTouchGestureFwPinchRecognizer::MultiRecognizeL( |
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189 const TTime& aEventTime, |
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190 const TPoint& aFirstPointerPos, |
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191 const TPoint& aSecondPointerPos ) |
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192 { |
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193 const TInt pinchThreshold = iPinchDetected ? |
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194 PinchMovementThreshold() : PinchInitialThreshold(); |
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195 |
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196 // We use boundingRect instead of individual positions, because |
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197 // those positions are not stable with all HW. Instead, bounding rect is. |
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198 TRect boundingRect = |
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199 CalculateBoundingRect( aFirstPointerPos, aSecondPointerPos ); |
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200 |
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201 // Snap to iPinchRect values. |
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202 TRect normalizedRect = boundingRect; |
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203 NormalizeValue( normalizedRect.iTl.iX, iPinchRect.iTl.iX, pinchThreshold ); |
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204 NormalizeValue( normalizedRect.iTl.iY, iPinchRect.iTl.iY, pinchThreshold ); |
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205 NormalizeValue( normalizedRect.iBr.iX, iPinchRect.iBr.iX, pinchThreshold ); |
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206 NormalizeValue( normalizedRect.iBr.iY, iPinchRect.iBr.iY, pinchThreshold ); |
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207 |
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208 // Determine if width or height should be ignored. |
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209 // If length of a dimension is close to zero, it's assumed that |
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210 // those values may be unreliable. |
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211 const TInt dimensionThreshold = PinchDimensionThreshold(); |
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212 TBool ignoreWidth = |
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213 ( boundingRect.Width() < dimensionThreshold ) || |
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214 ( normalizedRect.Width() < dimensionThreshold ) || |
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215 ( iPinchRect.Width() < dimensionThreshold ); |
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216 TBool ignoreHeight = |
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217 ( boundingRect.Height() < dimensionThreshold ) || |
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218 ( normalizedRect.Height() < dimensionThreshold ) || |
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219 ( iPinchRect.Height() < dimensionThreshold ); |
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220 |
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221 // Calculate change in width & height. |
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222 TInt widthDelta = ( normalizedRect.Width() - iPinchRect.Width() ); |
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223 TInt heightDelta = ( normalizedRect.Height() - iPinchRect.Height() ); |
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224 |
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225 TBool handleEvent = EFalse; |
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226 if ( normalizedRect != iPinchRect ) |
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227 { |
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228 handleEvent = ETrue; |
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229 iPinchRect = normalizedRect; |
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230 } |
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231 |
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232 if ( ignoreWidth ) |
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233 { |
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234 widthDelta = 0; |
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235 iStoredWidthDelta = 0; |
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236 } |
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237 |
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238 if ( ignoreHeight ) |
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239 { |
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240 heightDelta = 0; |
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241 iStoredHeightDelta = 0; |
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242 } |
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243 |
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244 // Pinch values are sent in a slight delay in order to prevent |
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245 // sending of incorrect values when pointer coordinates are |
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246 // snapped to horizontal/vertical line as snapping tends to |
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247 // happen with two events (one for each pointer). |
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248 // |
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249 // Events are sent here. |
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250 |
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251 TInt oldStoredWidthDelta = iStoredWidthDelta; |
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252 TInt oldStoredHeightDelta = iStoredHeightDelta; |
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253 |
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254 if ( oldStoredWidthDelta || oldStoredHeightDelta ) |
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255 { |
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256 iStoredWidthDelta = 0; |
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257 iStoredHeightDelta = 0; |
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258 |
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259 TInt movement = 0; |
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260 |
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261 if ( CheckDurationThreshold( aEventTime ) ) |
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262 { |
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263 movement = |
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264 CalculateMovement( |
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265 oldStoredWidthDelta, |
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266 oldStoredHeightDelta ); |
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267 } |
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268 |
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269 |
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270 if ( movement ) |
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271 { |
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272 if ( iPinchDetected ) |
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273 { |
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274 SendPinchEventL( EAknTouchGestureFwOn, movement ); |
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275 } |
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276 else |
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277 { |
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278 iPinchDetected = ETrue; |
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279 SendPinchEventL( EAknTouchGestureFwStart, movement ); |
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280 } |
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281 } |
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282 } |
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283 |
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284 if ( !handleEvent ) |
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285 { |
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286 // No change, no need to continue |
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287 return; |
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288 } |
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289 |
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290 // Now it is guaranteed that widthDelta or heightDelta does not equal |
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291 // to zero. |
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292 |
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293 // Update width direction tracer |
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294 if ( !ignoreWidth ) |
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295 { |
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296 iPinchWidthTracer.Update( |
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297 widthDelta, |
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298 PinchDirectionChangeSensitivity() ); |
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299 } |
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300 else |
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301 { |
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302 // Cannot say anything about this direction - snapped together |
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303 iPinchWidthTracer.Reset(); |
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304 } |
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305 |
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306 // Update height direction tracer |
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307 if ( !ignoreHeight ) |
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308 { |
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309 iPinchHeightTracer.Update( |
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310 heightDelta, |
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311 PinchDirectionChangeSensitivity() ); |
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312 } |
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313 else |
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314 { |
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315 // Cannot say anything about this direction - snapped together |
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316 iPinchHeightTracer.Reset(); |
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317 } |
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318 |
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319 // Reset direction tracer if height changes but width stays the same. |
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320 if ( widthDelta ) |
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321 { |
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322 iResetPinchWidthTracer = 0; |
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323 } |
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324 |
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325 if ( !widthDelta && heightDelta ) |
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326 { |
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327 if ( iResetPinchWidthTracer >= PinchDirectionResetSensitivity() ) |
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328 { |
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329 iPinchWidthTracer.Reset(); |
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330 iResetPinchWidthTracer = 0; |
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331 } |
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332 else |
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333 { |
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334 iResetPinchWidthTracer++; |
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335 } |
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336 } |
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337 |
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338 // Reset direction tracer if width changes but height stays the same. |
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339 if ( heightDelta ) |
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340 { |
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341 iResetPinchHeightTracer = 0; |
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342 } |
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343 |
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344 if ( !heightDelta && widthDelta ) |
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345 { |
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346 if ( iResetPinchHeightTracer >= PinchDirectionResetSensitivity() ) |
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347 { |
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348 iPinchHeightTracer.Reset(); |
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349 iResetPinchHeightTracer = 0; |
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350 } |
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351 else |
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352 { |
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353 iResetPinchHeightTracer++; |
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354 } |
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355 } |
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356 |
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357 TInt pinchWidthDelta = 0; |
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358 TInt pinchHeightDelta = 0; |
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359 |
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360 if ( widthDelta >= 0 && heightDelta >= 0 ) |
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361 { |
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362 TDirectionTracer::TDirection widthDir = |
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363 iPinchWidthTracer.Direction(); |
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364 TDirectionTracer::TDirection heightDir = |
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365 iPinchHeightTracer.Direction(); |
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366 |
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367 if ( ( widthDir == TDirectionTracer::EDirectionPositive && |
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368 heightDir != TDirectionTracer::EDirectionNegative ) || |
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369 ( heightDir == TDirectionTracer::EDirectionPositive && |
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370 widthDir != TDirectionTracer::EDirectionNegative ) ) |
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371 { |
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372 pinchWidthDelta = widthDelta; |
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373 pinchHeightDelta = heightDelta; |
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374 } |
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375 } |
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376 else if ( widthDelta <= 0 && heightDelta <= 0 ) |
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377 { |
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378 TDirectionTracer::TDirection widthDir = |
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379 iPinchWidthTracer.Direction(); |
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380 TDirectionTracer::TDirection heightDir = |
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381 iPinchHeightTracer.Direction(); |
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382 |
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383 if ( ( widthDir == TDirectionTracer::EDirectionNegative && |
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384 heightDir != TDirectionTracer::EDirectionPositive ) || |
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385 ( heightDir == TDirectionTracer::EDirectionNegative && |
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386 widthDir != TDirectionTracer::EDirectionPositive ) ) |
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387 { |
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388 pinchWidthDelta = widthDelta; |
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389 pinchHeightDelta = heightDelta; |
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390 } |
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391 } |
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392 else |
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393 { |
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394 // Ignore mixed changes. |
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395 } |
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396 |
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397 // Pinch values are sent in a slight delay in order to prevent |
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398 // sending of incorrect values when pointer coordinates are |
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399 // snapped to horizontal/vertical line. |
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400 // |
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401 // Now just store delta values here. |
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402 |
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403 iStoredTime = aEventTime; |
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404 iStoredWidthDelta = pinchWidthDelta; |
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405 iStoredHeightDelta = pinchHeightDelta; |
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406 } |
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407 |
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408 |
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409 // --------------------------------------------------------------------------- |
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410 // Ends the recognition of the pinch gesture. |
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411 // --------------------------------------------------------------------------- |
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412 // |
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413 void CAknTouchGestureFwPinchRecognizer::CompleteMultiRecognizingL( |
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414 const TTime& aEventTime ) |
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415 { |
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416 if ( iContinuousFeedback ) |
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417 { |
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418 StopContinuousFeedback(); |
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419 iContinuousFeedback = EFalse; |
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420 } |
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421 // Send Pinch stopped event only if pinch was detected |
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422 if ( iPinchDetected ) |
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423 { |
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424 TInt movement = 0; |
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425 |
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426 if ( CheckDurationThreshold( aEventTime ) ) |
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427 { |
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428 movement = |
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429 CalculateMovement( |
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430 iStoredWidthDelta, |
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431 iStoredHeightDelta ); |
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432 } |
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433 |
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434 iStoredWidthDelta = 0; |
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435 iStoredHeightDelta = 0; |
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436 |
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437 SendPinchEventL( EAknTouchGestureFwStop, movement ); |
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438 } |
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439 } |
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440 |
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441 |
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442 // --------------------------------------------------------------------------- |
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443 // Resets the recognizer state. |
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444 // --------------------------------------------------------------------------- |
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445 // |
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446 void CAknTouchGestureFwPinchRecognizer::Reset() |
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447 { |
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448 iPinchDetected = EFalse; |
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449 iPinchRect.SetRect( 0, 0, 0, 0 ); |
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450 iPinchWidthTracer.Reset(); |
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451 iPinchHeightTracer.Reset(); |
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452 iResetPinchWidthTracer = 0; |
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453 iResetPinchHeightTracer = 0; |
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454 iStoredWidthDelta = 0; |
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455 iStoredHeightDelta = 0; |
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456 } |
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457 |
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458 |
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459 // --------------------------------------------------------------------------- |
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460 // Sends a pinch gesture event to the observer. |
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461 // --------------------------------------------------------------------------- |
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462 // |
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463 void CAknTouchGestureFwPinchRecognizer::SendPinchEventL( |
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464 TAknTouchGestureFwState aGestureState, |
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465 TInt aMovementDelta ) |
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466 { |
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467 if ( aGestureState != EAknTouchGestureFwStop ) |
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468 { |
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469 TTouchFeedbackType feedbackType( |
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470 FeedbackType( EAknTouchGestureFwPinch ) ); |
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471 |
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472 if ( feedbackType & ETouchFeedbackVibra ) |
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473 { |
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474 StartContinuousFeedback( ETouchContinuousSmooth, |
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475 KAknTouchGestureFwFeedbackIntensity, |
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476 KAknTouchGestureFwPinchFeedbackTimeout ); |
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477 iContinuousFeedback = ETrue; |
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478 } |
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479 } |
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480 |
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481 TAknTouchGestureFwPinchEvent pinch; |
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482 pinch.SetState( aGestureState ); |
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483 pinch.SetMovement( aMovementDelta ); |
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484 SendGestureEventL( pinch ); |
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485 } |
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486 |
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487 |
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488 // ---------------------------------------------------------------------------- |
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489 // Returns pinch initial threshold. |
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490 // ---------------------------------------------------------------------------- |
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491 // |
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492 TInt CAknTouchGestureFwPinchRecognizer::PinchInitialThreshold() const |
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493 { |
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494 return Settings().PinchInitialThreshold(); |
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495 } |
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496 |
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497 |
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498 // ---------------------------------------------------------------------------- |
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499 // Returns pinch movement threshold. |
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500 // ---------------------------------------------------------------------------- |
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501 // |
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502 TInt CAknTouchGestureFwPinchRecognizer::PinchMovementThreshold() const |
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503 { |
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504 return Settings().PinchMovementThreshold(); |
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505 } |
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506 |
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507 |
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508 // ---------------------------------------------------------------------------- |
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509 // Returns pinch direction change sensitivity. |
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510 // ---------------------------------------------------------------------------- |
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511 // |
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512 TInt CAknTouchGestureFwPinchRecognizer::PinchDirectionChangeSensitivity() const |
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513 { |
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514 return Settings().PinchDirectionChangeSensitivity(); |
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515 } |
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516 |
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517 |
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518 // ---------------------------------------------------------------------------- |
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519 // Returns pinch direction reset sensitivity. |
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520 // ---------------------------------------------------------------------------- |
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521 // |
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522 TInt CAknTouchGestureFwPinchRecognizer::PinchDirectionResetSensitivity() const |
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523 { |
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524 return Settings().PinchDirectionResetSensitivity(); |
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525 } |
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526 |
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527 |
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528 // ---------------------------------------------------------------------------- |
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529 // Returns pinch dimension threshold. |
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530 // ---------------------------------------------------------------------------- |
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531 // |
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532 TInt CAknTouchGestureFwPinchRecognizer::PinchDimensionThreshold() const |
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533 { |
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534 return Settings().PinchDimensionThreshold(); |
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535 } |
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536 |
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537 // ---------------------------------------------------------------------------- |
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538 // Returns pinch maximum confirmation duration. |
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539 // ---------------------------------------------------------------------------- |
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540 // |
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541 TInt CAknTouchGestureFwPinchRecognizer::PinchMaximumConfirmationDuration() |
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542 const |
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543 { |
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544 return Settings().PinchMaximumConfirmationDuration() * |
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545 KMicroSecondsInMilliSecond; |
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546 } |
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547 |
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548 |
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549 // --------------------------------------------------------------------------- |
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550 // Calculates bounding rect so that both aPoint1 and aPoint2 are inside |
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551 // the rectangle. |
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552 // --------------------------------------------------------------------------- |
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553 // |
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554 TRect CAknTouchGestureFwPinchRecognizer::CalculateBoundingRect( |
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555 const TPoint& aPoint1, |
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556 const TPoint& aPoint2 ) |
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557 { |
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558 TRect result; |
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559 result.iTl.iX = Min( aPoint1.iX, aPoint2.iX ); |
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560 result.iTl.iY = Min( aPoint1.iY, aPoint2.iY ); |
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561 result.iBr.iX = Max( aPoint1.iX, aPoint2.iX ) + 1; |
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562 result.iBr.iY = Max( aPoint1.iY, aPoint2.iY ) + 1; |
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563 return result; |
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564 } |
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565 |
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566 |
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567 // --------------------------------------------------------------------------- |
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568 // Snaps aValue to aReference if they are sufficiently close |
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569 // (defined by aMargin). |
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570 // --------------------------------------------------------------------------- |
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571 // |
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572 void CAknTouchGestureFwPinchRecognizer::NormalizeValue( |
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573 TInt& aValue, |
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574 TInt aReference, |
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575 TInt aMargin ) |
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576 { |
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577 if ( Abs( aReference - aValue ) < aMargin ) |
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578 { |
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579 aValue = aReference; |
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580 } |
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581 } |
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582 |
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583 // --------------------------------------------------------------------------- |
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584 // Calculates movement value |
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585 // --------------------------------------------------------------------------- |
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586 // |
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587 TInt CAknTouchGestureFwPinchRecognizer::CalculateMovement( |
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588 TInt aWidthDelta, |
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589 TInt aHeightDelta ) |
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590 { |
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591 TInt result = 0; |
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592 |
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593 if ( aWidthDelta >= 0 && aHeightDelta >= 0 ) |
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594 { |
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595 result = Max( aWidthDelta, aHeightDelta ); |
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596 } |
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597 else if ( aWidthDelta <= 0 && aHeightDelta <= 0 ) |
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598 { |
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599 result = Min( aWidthDelta, aHeightDelta ); |
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600 } |
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601 else |
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602 { |
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603 // Mixed case, return 'no movement'. |
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604 } |
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605 |
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606 return result; |
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607 } |
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608 |
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609 // --------------------------------------------------------------------------- |
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610 // Checks duration threshold. |
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611 // --------------------------------------------------------------------------- |
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612 // |
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613 TBool CAknTouchGestureFwPinchRecognizer::CheckDurationThreshold( |
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614 const TTime& aEventTime ) const |
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615 { |
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616 TTimeIntervalMicroSeconds duration = |
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617 aEventTime.MicroSecondsFrom( iStoredTime ); |
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618 TTimeIntervalMicroSeconds durationThreshold( |
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619 PinchMaximumConfirmationDuration() ); |
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620 |
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621 return ( duration < durationThreshold ); |
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622 } |
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623 |
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624 // End of File |