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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: |
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15 * |
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16 */ |
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17 |
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18 #include <penpointereventsuppressor.h> |
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19 |
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20 const TInt KPenPointerEventSuppressorDefaultMaxTapDuration = 400000; // 0.4 seconds |
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21 const TInt KPenPointerEventSuppressorDefaultMinInterDragInterval = 0; |
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22 const TInt KPenPointerEventSuppressorDefaultMovement = 6; |
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23 |
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24 CPenPointerEventSuppressor* CPenPointerEventSuppressor::NewL() |
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25 { |
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26 return new (ELeave) CPenPointerEventSuppressor; |
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27 } |
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28 |
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29 CPenPointerEventSuppressor::~CPenPointerEventSuppressor() |
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30 { |
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31 |
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32 } |
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33 |
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34 CPenPointerEventSuppressor::CPenPointerEventSuppressor() |
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35 : iMaxTapDuration(KPenPointerEventSuppressorDefaultMaxTapDuration), |
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36 iMinInterDragInterval(KPenPointerEventSuppressorDefaultMinInterDragInterval), |
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37 iTap(EFalse) |
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38 { |
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39 // default move limit is 6 units, which seems to be a forgiving value for finger touch |
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40 iMaxTapMove.iWidth = KPenPointerEventSuppressorDefaultMovement; |
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41 iMaxTapMove.iHeight = KPenPointerEventSuppressorDefaultMovement; |
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42 } |
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43 |
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44 TBool CPenPointerEventSuppressor::SuppressPointerEvent( |
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45 const TPointerEvent& aPointerEvent) |
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46 { |
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47 switch ( aPointerEvent.iType ) |
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48 { |
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49 case TPointerEvent::EButton1Down: |
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50 { |
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51 iDownTime.HomeTime(); |
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52 iTap = ETrue; |
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53 iDownPos = aPointerEvent.iPosition; |
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54 iLastEventTime = iDownTime; |
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55 break; |
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56 } |
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57 case TPointerEvent::EDrag: |
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58 { |
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59 TTime now; |
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60 now.HomeTime(); |
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61 if (iTap) |
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62 { |
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63 TPoint delta = aPointerEvent.iPosition - iDownPos; |
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64 if (Abs(delta.iX) > iMaxTapMove.iWidth || |
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65 Abs(delta.iY) > iMaxTapMove.iHeight || |
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66 now.MicroSecondsFrom(iDownTime) >= iMaxTapDuration) |
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67 { |
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68 // This touch action has gone outside the parameters of a tap |
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69 // the drag event should be handled |
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70 iTap = EFalse; |
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71 iLastEventTime = now; |
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72 return EFalse; |
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73 } |
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74 else |
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75 { |
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76 // still a tap, so suppress the drag event |
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77 return ETrue; |
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78 } |
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79 } |
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80 else if (now.MicroSecondsFrom(iLastEventTime) < iMinInterDragInterval) |
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81 { |
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82 // too soon since the last drag, suppress it |
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83 return ETrue; |
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84 } |
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85 |
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86 // this drag event should be handled |
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87 iLastEventTime = now; |
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88 break; |
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89 } |
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90 case TPointerEvent::EButton1Up: |
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91 { |
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92 iTap = EFalse; |
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93 break; |
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94 } |
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95 case TPointerEvent::ENullType: |
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96 break; |
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97 default: |
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98 break; |
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99 } |
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100 |
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101 // all non-drag events should be handled |
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102 return EFalse; |
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103 } |
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104 |
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105 void CPenPointerEventSuppressor::SetMaxTapDuration( |
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106 TTimeIntervalMicroSeconds aDuration) |
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107 { |
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108 iMaxTapDuration = aDuration; |
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109 } |
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110 |
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111 void CPenPointerEventSuppressor::SetMaxTapMove(TSize aMoveLimits) |
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112 { |
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113 iMaxTapMove = aMoveLimits; |
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114 } |
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115 |
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116 void CPenPointerEventSuppressor::SetMinInterDragInterval( |
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117 TTimeIntervalMicroSeconds aInterval) |
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118 { |
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119 iMinInterDragInterval = aInterval; |
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120 } |