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1 /* |
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2 * Copyright (c) 2004 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 /** |
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19 * @file |
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20 * |
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21 * @internalComponent |
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22 * @prototype |
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23 */ |
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24 |
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25 #ifndef __DRIVEWATCHER_H__ |
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26 #define __DRIVEWATCHER_H__ |
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27 |
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28 #include <e32base.h> |
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29 #include <f32file.h> |
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30 |
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31 namespace Swi |
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32 { |
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33 |
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34 /** |
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35 * Observer interface called whenever a media change is detected. |
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36 */ |
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37 class MDriveObserver |
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38 { |
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39 public: |
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40 /// Enumeration indicating whether a card was inserted or removed |
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41 enum TChangeType { EMediaInserted, EMediaRemoved }; |
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42 |
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43 /** |
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44 * This function is called to indicate a media change has occurred. |
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45 * |
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46 * @param aChangeType EInserted to indicate media has been inserted, |
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47 * or ERemoved to indicate media has been removed. |
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48 */ |
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49 virtual void MediaChangeL(TInt aDrive, TChangeType aChangeType)=0; |
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50 }; |
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51 |
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52 /** |
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53 * This active object waits for an indication that the media has changed, |
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54 * and then notifies its observer. |
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55 */ |
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56 class CDriveWatcher : public CActive |
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57 { |
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58 public: |
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59 static CDriveWatcher* NewL(RFs& aFs, TInt aDrive, MDriveObserver& aObserver,TInt aPriority = EPriorityStandard); |
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60 static CDriveWatcher* NewLC(RFs& aFs, TInt aDrive, MDriveObserver& aObserver,TInt aPriority = EPriorityStandard); |
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61 |
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62 ~CDriveWatcher(); |
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63 |
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64 TInt Drive() const; |
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65 private: |
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66 CDriveWatcher(RFs& aFs, TInt aDrive, MDriveObserver& aObserver, TInt aPriority); |
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67 |
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68 void ConstructL(); |
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69 |
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70 // from CActive |
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71 void DoCancel(); |
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72 void RunL(); |
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73 |
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74 /// Set up change notification. |
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75 void WaitForChangeL(); |
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76 |
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77 /** |
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78 * Notifies the observer of the appropriate media change depending on whether |
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79 * media is now present on the drive we're currently watching. |
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80 */ |
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81 void NotifyMediaChange(); |
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82 |
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83 /** |
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84 * Determines if the media is present in the drive we are currently watching. |
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85 * |
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86 * @return ETrue if the media is present, EFalse otherwise. |
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87 */ |
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88 TBool IsMediaPresentL(); |
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89 |
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90 private: |
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91 /// Not owned by this class |
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92 RFs& iFs; |
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93 |
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94 /// Drive number we are watching |
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95 TInt iDrive; |
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96 |
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97 /// Observer to notify of changes |
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98 MDriveObserver& iObserver; |
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99 }; |
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100 |
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101 // inline functions from CDriveWatcher |
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102 |
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103 inline TInt CDriveWatcher::Drive() const |
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104 { |
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105 return iDrive; |
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106 } |
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107 |
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108 } //namespace Swi |
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109 |
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110 #endif // #ifndef __DRIVEWATCHER_H__ |
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111 |