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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 #include <aknpointereventsuppressor.h> |
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18 #include <aknlayoutscalable_avkon.cdl.h> |
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19 |
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20 const TInt KAknPointerEventSuppressorDefaultMaxTapDuration = 400000; // 0.4 seconds |
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21 const TInt KAknPointerEventSuppressorDefaultMinInterDragInterval = 0; |
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22 |
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23 EXPORT_C CAknPointerEventSuppressor* CAknPointerEventSuppressor::NewL() |
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24 { |
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25 return new(ELeave) CAknPointerEventSuppressor; |
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26 } |
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27 |
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28 EXPORT_C CAknPointerEventSuppressor::~CAknPointerEventSuppressor() |
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29 { |
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30 } |
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31 |
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32 CAknPointerEventSuppressor::CAknPointerEventSuppressor() |
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33 : iMaxTapDuration(KAknPointerEventSuppressorDefaultMaxTapDuration), |
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34 iMinInterDragInterval(KAknPointerEventSuppressorDefaultMinInterDragInterval), |
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35 iTap(EFalse) |
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36 { |
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37 // default move limit is 6 units, which seems to be a forgiving value for finger touch |
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38 TInt maxMove = AknLayoutScalable_Avkon::aid_value_unit2().LayoutLine().iW * 6 / 10; |
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39 iMaxTapMove.iWidth = maxMove; |
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40 iMaxTapMove.iHeight = maxMove; |
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41 } |
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42 |
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43 EXPORT_C TBool CAknPointerEventSuppressor::SuppressPointerEvent(const TPointerEvent& aPointerEvent) |
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44 { |
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45 switch (aPointerEvent.iType) |
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46 { |
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47 case TPointerEvent::EButton1Down: |
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48 iDownTime.HomeTime(); |
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49 iTap = ETrue; |
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50 iDownPos = aPointerEvent.iPosition; |
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51 iLastEventTime = iDownTime; |
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52 break; |
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53 |
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54 case TPointerEvent::EDrag: |
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55 { |
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56 TTime now; |
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57 now.HomeTime(); |
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58 if (iTap) |
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59 { |
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60 TPoint delta = aPointerEvent.iPosition - iDownPos; |
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61 if (Abs(delta.iX) > iMaxTapMove.iWidth || |
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62 Abs(delta.iY) > iMaxTapMove.iHeight || |
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63 now.MicroSecondsFrom(iDownTime) >= iMaxTapDuration) |
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64 { |
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65 // This touch action has gone outside the parameters of a tap |
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66 // the drag event should be handled |
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67 iTap = EFalse; |
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68 iLastEventTime = now; |
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69 return EFalse; |
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70 } |
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71 else |
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72 { |
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73 // still a tap, so suppress the drag event |
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74 return ETrue; |
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75 } |
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76 } |
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77 else if (now.MicroSecondsFrom(iLastEventTime) < iMinInterDragInterval) |
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78 { |
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79 // too soon since the last drag, suppress it |
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80 return ETrue; |
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81 } |
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82 |
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83 // this drag event should be handled |
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84 iLastEventTime = now; |
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85 break; |
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86 } |
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87 |
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88 case TPointerEvent::EButton1Up: |
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89 iTap = EFalse; |
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90 break; |
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91 |
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92 default: |
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93 break; |
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94 } |
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95 |
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96 // all non-drag events should be handled |
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97 return EFalse; |
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98 } |
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99 |
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100 EXPORT_C void CAknPointerEventSuppressor::SetMaxTapDuration(TTimeIntervalMicroSeconds aDuration) |
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101 { |
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102 iMaxTapDuration = aDuration; |
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103 } |
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104 |
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105 EXPORT_C void CAknPointerEventSuppressor::SetMaxTapMove(TSize aMoveLimits) |
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106 { |
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107 iMaxTapMove = aMoveLimits; |
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108 } |
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109 |
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110 EXPORT_C void CAknPointerEventSuppressor::SetMinInterDragInterval(TTimeIntervalMicroSeconds aInterval) |
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111 { |
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112 iMinInterDragInterval = aInterval; |
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113 } |
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114 |