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1 /* |
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2 * Copyright (c) 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 the License "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: Zoom Gesture Recognizer |
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15 * |
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16 */ |
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17 |
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18 #ifndef ZOOMGESTURERECOGNISER_H_ |
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19 #define ZOOMGESTURERECOGNISER_H_ |
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20 |
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21 #include "rt_gestureengineif.h" |
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22 #include <rt_gestureif.h> |
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23 #include <rt_gesturelistener.h> |
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24 |
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25 class CCoeControl ; |
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26 |
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27 namespace stmGesture |
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28 { |
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29 |
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30 /*! |
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31 * CZoomGestureRecogniser handles zoomin gesture: start from near lower left / upper right corner and drag |
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32 * This is useful if one wants to implement single handed zooming so can be done using thumb |
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33 * (no need to use pinch i.e. hold device in one hand and use two fingers of the other) |
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34 * Current spec is: |
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35 * - touch lower left corner and start dragging => initialize ZOOM IN |
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36 * - touch upper right corner and start dragging => initialize ZOOM OUT |
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37 * store the touch point and then calculate the distance until release |
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38 * The distance is the zoom factor (probably needs some adjustment, not just the pixels...) |
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39 */ |
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40 NONSHARABLE_CLASS( CZoomGestureRecogniser ): public CGestureRecogniser |
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41 { |
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42 public: |
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43 static const TGestureUid KUid = EGestureUidCornerZoom; |
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44 |
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45 /** Two-phase constructor */ |
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46 static CZoomGestureRecogniser* NewL(MGestureListener* aListener); |
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47 virtual ~CZoomGestureRecogniser(); |
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48 |
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49 /*! |
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50 * MGestureRecogniserIf methods |
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51 */ |
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52 virtual TGestureRecognitionState recognise(int numOfActiveStreams, MGestureEngineIf* ge) ; |
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53 virtual void release(MGestureEngineIf* ge) ; |
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54 virtual TGestureUid gestureUid() const |
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55 { |
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56 return KUid; |
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57 } |
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58 |
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59 /*! |
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60 * Additional methods to set up zoom in gesture recogniser: |
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61 * define the rectangle where the lower left corner is |
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62 * \param theArea |
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63 */ |
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64 void setArea(const TRect& theArea) ; |
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65 |
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66 /*! |
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67 * Additional methods to set up zoom in gesture recogniser: |
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68 * Define how close to the lower left corner the touch must happen |
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69 * \param rangeInPixels |
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70 */ |
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71 void setRange(int rangeInPixels) ; |
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72 |
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73 private: |
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74 CZoomGestureRecogniser(MGestureListener* aListener) ; |
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75 |
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76 float calculateDistance(const TPoint& aTp) ; |
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77 int adjustZoom(float& aPreviousDistance, float aNewDistance) ; |
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78 |
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79 private: |
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80 TRect m_area ; |
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81 int m_rangesizeInPixels ; |
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82 TZoomType m_zoomtype ; |
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83 bool m_zooming ; |
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84 TPoint m_startingtouch ; |
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85 TPoint m_previoustouch ; |
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86 int m_delta ; |
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87 |
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88 }; |
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89 |
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90 } // namespace |
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91 |
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92 #endif /* ZOOMGESTURERECOGNISER_H_ */ |