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1 /* |
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2 * Copyright (c) 2002-2006 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: This class caches strings |
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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 |
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20 #ifndef CFILEMANAGERSTRINGCACHE_H |
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21 #define CFILEMANAGERSTRINGCACHE_H |
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22 |
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23 // INCLUDES |
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24 #include <e32base.h> |
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25 #include <f32file.h> |
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26 #include <badesca.h> |
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27 |
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28 // CONSTANTS |
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29 const TInt KNumStringCacheItems = 16; |
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30 const TInt KFormatStringLen = KMaxFileName * 2; |
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31 |
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32 // FORWARD DECLARATIONS |
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33 class CFileManagerEngine; |
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34 class CFileManagerIconArray; |
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35 |
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36 |
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37 // CLASS DECLARATION |
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38 /** |
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39 * This class caches strings |
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40 * |
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41 * @since 2.7 |
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42 */ |
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43 class CFileManagerStringCache : public CBase, public MDesCArray |
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44 { |
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45 public: |
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46 |
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47 /** |
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48 * Two-phased constructor. |
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49 */ |
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50 static CFileManagerStringCache* NewL( |
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51 CFileManagerEngine& aEngine, |
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52 CFileManagerIconArray& aIconArray ); |
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53 |
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54 void Clear() const; |
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55 |
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56 /** |
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57 * Destructor. |
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58 */ |
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59 ~CFileManagerStringCache(); |
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60 |
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61 /** |
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62 * Gets last error |
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63 */ |
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64 TInt LastError() const; |
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65 |
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66 public: // From MDesCArray |
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67 |
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68 TInt MdcaCount() const; |
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69 TPtrC MdcaPoint(TInt aIndex) const; |
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70 |
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71 private: |
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72 /** |
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73 * C++ default constructor. |
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74 */ |
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75 CFileManagerStringCache( |
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76 CFileManagerEngine& aEngine, |
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77 CFileManagerIconArray& aIconArray ); |
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78 |
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79 /** |
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80 * By default Symbian 2nd phase constructor is private. |
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81 */ |
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82 void ConstructL(); |
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83 |
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84 /** |
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85 * Sets last error |
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86 */ |
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87 void SetError( TInt aError ) const; |
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88 |
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89 private: |
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90 |
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91 /** |
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92 * Searches index from cache and return cache index |
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93 * so it can be retrieve with FormattedString |
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94 */ |
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95 TInt FormattedStringFound( TInt aIndex ) const; |
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96 |
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97 /** |
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98 * Retrieve string from cache with FormattedStringFound() |
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99 * given index |
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100 */ |
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101 TPtrC FormattedString( TInt aIndex ) const; |
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102 |
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103 /** |
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104 * Stores string in iFormatted string with given |
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105 * listbox index. Checks the fartest position |
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106 * and stores there. |
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107 */ |
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108 void StoreFormattedStringL( TInt aIndex ) const; |
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109 |
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110 /** |
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111 * Clears cache item |
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112 * given index |
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113 */ |
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114 void Clear( TInt aIndex ) const; |
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115 |
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116 private: // Data |
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117 class TCacheItem |
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118 { |
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119 public: |
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120 HBufC* iString; |
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121 TInt iIndex; |
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122 }; |
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123 |
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124 // Ref: To get item details |
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125 CFileManagerEngine& iEngine; |
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126 |
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127 // Ref: To resolve icons |
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128 CFileManagerIconArray& iIconArray; |
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129 |
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130 // Own: array of formatted listbox items |
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131 TFixedArray< TCacheItem, KNumStringCacheItems > mutable |
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132 iFormattedItems; |
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133 |
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134 // Own: String buffer for formatting string |
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135 TBuf< KFormatStringLen > mutable iFormatString; |
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136 |
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137 // Own: Last error |
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138 TInt mutable iError; |
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139 |
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140 }; |
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141 |
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142 #endif // CFILEMANAGERSTRINGCACHE_H |
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143 |
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144 // End of File |
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145 |