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1 /* |
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2 * Copyright (c) 2008-2008 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: Gesture class |
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15 * |
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16 */ |
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17 |
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18 |
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19 #ifndef _XNGESTURE_H_ |
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20 #define _XNGESTURE_H_ |
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21 |
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22 // System includes |
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23 #include <e32base.h> |
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24 |
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25 // User includes |
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26 #include "xnpointarray.h" |
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27 #include "xngesturerecogniser.h" |
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28 |
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29 // Namespace declaration |
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30 |
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31 /** |
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32 * XnGestureHelper namespace |
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33 * Used for the whole gesture family - Gesture recognizer, gesture helper, |
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34 * Point array |
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35 */ |
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36 namespace XnGestureHelper |
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37 { |
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38 |
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39 /** |
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40 * Struct for a point in floating-point represanation |
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41 */ |
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42 NONSHARABLE_STRUCT( TRealPoint ) |
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43 { |
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44 inline TRealPoint(); |
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45 inline TRealPoint( const TRealPoint& aPoint ); |
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46 inline TRealPoint( TReal aX, TReal aY ); |
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47 inline TBool operator==( const TRealPoint& aPoint ) const; |
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48 |
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49 TReal32 iX; |
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50 TReal32 iY; |
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51 }; |
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52 |
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53 // Class declaration |
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54 |
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55 /** |
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56 * TGesture represents the gesture that the user has made. |
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57 * Implements MGestureEvent interface to allow clients to |
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58 * inspect the gesture |
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59 * |
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60 * @ingroup group_xnlayoutengine |
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61 */ |
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62 NONSHARABLE_CLASS( CXnGesture ) : public CBase |
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63 { |
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64 public: |
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65 |
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66 /** |
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67 * X and Y axes, or both |
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68 */ |
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69 enum TAxis |
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70 { |
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71 EAxisBoth, |
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72 EAxisHorizontal, |
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73 EAxisVertical |
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74 }; |
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75 |
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76 public: |
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77 |
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78 /** destructor */ |
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79 ~CXnGesture(); |
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80 |
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81 /** |
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82 * Sets the gesture as empty. resets timers to receive points |
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83 * immediately |
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84 */ |
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85 void Reset(); |
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86 |
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87 /** |
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88 * Check the gesture if it is empty |
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89 * |
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90 * @return ETrue if the gesture has no points |
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91 */ |
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92 TBool IsEmpty() const; |
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93 |
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94 /** |
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95 * Add a point to the sequence of points that forms the gesture |
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96 * Call Reset() just before adding the first point |
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97 * |
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98 * @param aPoint the point to add |
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99 * @return error code |
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100 */ |
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101 TInt AddPoint( const TPoint& aPoint ); |
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102 |
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103 /** |
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104 * Checks if the point it is close to holding point |
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105 * |
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106 * @param aPoint Point to be examined |
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107 * @return ETrue if the point is very near the holding point |
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108 */ |
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109 TBool IsNearHoldingPoint( const TPoint& aPoint ) const; |
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110 |
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111 /** |
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112 * Set the latest point as the holding point |
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113 */ |
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114 void SetHoldingPoint(); |
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115 |
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116 /** |
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117 * Checks if the examined point is at the last point's position |
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118 * |
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119 * @param aPoint Point to be examined |
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120 * @return ETrue if aPoint is the same as point added last |
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121 */ |
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122 TBool IsLatestPoint( const TPoint& aPoint ) const; |
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123 |
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124 /** |
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125 * After call, Code(...) will return appropriate holding gesture code. |
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126 */ |
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127 void StartHolding(); |
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128 |
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129 /** |
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130 * After call, Code(...) will return a "hold released" gesture code |
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131 * when the gesture is completed. Meanwhile, code will be drag. |
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132 */ |
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133 void ContinueHolding(); |
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134 |
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135 /** |
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136 * Set as stylus released |
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137 */ |
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138 void SetReleased(); |
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139 |
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140 /** |
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141 * Set the gesture as complete. Gesture is completed at pointer up |
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142 */ |
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143 void SetComplete(); |
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144 |
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145 /** |
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146 * After call, Code(...) will return a "cancelled" gesture code |
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147 */ |
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148 void SetCancelled(); |
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149 |
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150 /** |
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151 * Checks if the gesture is a tap |
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152 * |
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153 * @return Whether the current gesture is a tap |
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154 * (and hence not a swipe). Does not consider holding or |
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155 * other state information (such as whether the gesture was |
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156 * just started or is dragging). Results are based purely on |
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157 * the current stream of points. |
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158 */ |
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159 TBool IsTap() const; |
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160 |
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161 /** |
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162 * From MGestureEvent |
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163 * Checks and return current gesture status at desired axis |
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164 * |
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165 * @param aRelevantAxis Axis to be examined |
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166 * @return Gesture status |
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167 */ |
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168 TXnGestureCode Code( TAxis aRelevantAxis ) const; |
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169 |
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170 /** |
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171 * From MGestureEvent |
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172 * Checks and returns holding status |
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173 * |
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174 * @return Return holding |
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175 */ |
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176 TBool IsHolding() const; |
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177 |
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178 /** |
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179 * From MGestureEvent |
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180 * Returns first position form iPoints |
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181 * |
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182 * @return Returns first point |
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183 */ |
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184 TPoint StartPos() const; |
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185 |
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186 /** |
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187 * From MGestureEvent |
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188 * Returns current (last) position from iPoints |
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189 * |
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190 * @return Returns last point |
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191 */ |
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192 TPoint CurrentPos() const; |
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193 |
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194 /** |
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195 * From MGestureEvent |
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196 * Returns speed of X, Y movement |
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197 * |
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198 * @return Speed in X, Y axis |
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199 */ |
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200 TRealPoint Speed() const; |
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201 |
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202 /** |
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203 * From MGestureEvent |
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204 * Scales the speed |
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205 * |
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206 * @return Scaled speed |
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207 */ |
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208 TRealPoint SpeedPercent( const TRect& aEdges ) const; |
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209 |
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210 /** |
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211 * From MGestureEvent |
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212 * Cheks and returns distance between start and current position |
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213 * |
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214 * @return Distance between two points |
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215 */ |
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216 TPoint Distance() const; |
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217 |
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218 private: |
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219 |
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220 /** Information of an earlier gesture */ |
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221 struct TGestureRecord |
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222 { |
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223 enum TType |
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224 { |
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225 ETypeOther, |
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226 ETypeTap, |
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227 ETypeDoubleTap |
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228 }; |
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229 |
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230 TGestureRecord(); |
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231 TGestureRecord( TType aType, TTime aCompletionTime, TPoint aPos ); |
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232 |
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233 /** type of the gesture */ |
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234 TType iType; |
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235 /** completion time fo the gesture */ |
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236 TTime iCompletionTime; |
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237 /** point of completion */ |
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238 TPoint iPos; |
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239 }; |
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240 |
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241 /** |
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242 * Checks and returns gesture |
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243 * |
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244 * @param aRelevantAxis See @ref MGestureEvent::Code |
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245 * @return gesture code by analysing the sequence of points |
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246 */ |
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247 TXnGestureCode CodeFromPoints( TAxis aRelevantAxis ) const; |
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248 |
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249 /** |
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250 * Returns elapsed time |
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251 * |
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252 * @return elapsed time between the latest and previous points |
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253 */ |
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254 inline TTimeIntervalMicroSeconds32 TimeFromPreviousPoint() const; |
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255 |
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256 /** |
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257 * Checks whether the movement has stopped |
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258 * |
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259 * @return ETrue if user has stopped moving the stylus before lifting |
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260 * it |
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261 */ |
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262 inline TBool IsMovementStopped() const; |
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263 |
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264 /** |
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265 * Offset of the last entry |
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266 * |
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267 * @return aOffset'th last entry in the list of points |
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268 */ |
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269 inline const TXnPointEntry& NthLastEntry( TInt aOffset ) const; |
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270 |
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271 /** |
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272 * Calles NthLastEntry for previous point |
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273 * |
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274 * @return previous point (may not be exactly the point before last) |
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275 */ |
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276 inline const TXnPointEntry& PreviousEntry() const; |
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277 |
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278 /** |
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279 * Returns the point before the last one |
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280 * |
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281 * @return position of point received just before the latest point |
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282 */ |
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283 inline TPoint PreviousPos() const; |
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284 |
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285 /** |
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286 * Return if the tap was a double tap |
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287 * |
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288 * @return ETrue if tap should be a double tap |
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289 */ |
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290 TBool IsTapDoubleTap() const; |
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291 |
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292 /** |
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293 * Returns current gesture type |
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294 * |
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295 * @return the type of the current gesture |
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296 */ |
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297 TGestureRecord::TType Type() const; |
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298 |
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299 private: |
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300 // Enumerators for holding and completion state |
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301 |
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302 /** |
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303 * the different states that indicate whether user has made a holding |
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304 * gesture |
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305 */ |
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306 enum THoldingState |
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307 { |
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308 /** before holding activated (i.e., holding not activated) */ |
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309 ENotHolding = 0, |
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310 /** holding activated just now (lasts just one callback round) */ |
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311 EHoldStarting, |
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312 /** holding activated earlier */ |
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313 EHolding |
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314 }; |
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315 |
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316 /** |
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317 * Completion states |
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318 */ |
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319 enum TCompletionState |
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320 { |
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321 // Note: implementation assumes this order of enums |
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322 ENotComplete = 0, |
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323 ECancelled, |
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324 EComplete, |
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325 EReleased |
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326 }; |
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327 |
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328 private: |
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329 // Members |
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330 |
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331 /** |
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332 * sequence of points that make up the gesture, owned. |
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333 */ |
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334 RArray< TXnPointEntry > iPoints; |
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335 |
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336 /** |
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337 * index in iPoints of the point in which user started holding |
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338 */ |
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339 TInt iHoldingPointIndex; |
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340 |
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341 /** |
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342 * state that indicates is user has held the pointer down in one |
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343 * position for long time to indicate a holding gesture |
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344 */ |
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345 THoldingState iHoldingState; |
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346 |
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347 /** |
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348 * gesture only becomes complete when user lifts the pointer |
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349 */ |
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350 TCompletionState iState; |
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351 |
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352 /** |
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353 * time when the stylus was lifted. |
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354 */ |
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355 TTime iCompletionTime; |
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356 |
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357 /** |
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358 * previous gesture information for double tap |
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359 */ |
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360 TGestureRecord iPreviousGesture; |
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361 }; |
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362 } // namespace XnGestureHelper |
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363 |
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364 // Inline functions |
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365 #include "xngesture.inl" |
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366 |
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367 #endif // _XNGESTURE_H_ |