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1 /* |
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2 * Copyright (c) 2008-2009 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: Fetch context to retrieve thumbnails |
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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 |
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21 #ifndef C_GLXTHUMBNAILCONTEXT_H |
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22 #define C_GLXTHUMBNAILCONTEXT_H |
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23 |
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24 #include <e32std.h> |
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25 #include "mglxfetchcontext.h" |
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26 #include "glxmedialistiterator.h" |
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27 #include <mglxresolutionchangeobserver.h> |
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28 |
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29 // Forward declarations |
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30 |
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31 class CGlxAttributeContext; |
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32 class CGlxDRMUtility; |
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33 class CGlxResolutionUtility; |
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34 class MGlxCache; |
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35 class MGlxMediaList; |
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36 class TGlxMedia; |
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37 |
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38 /** |
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39 * CGlxThumbnailContext |
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40 * |
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41 * Fetch context to retrieve thumbnails |
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42 * |
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43 * @lib glxmedialists.lib |
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44 */ |
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45 class CGlxThumbnailContext : public CBase, public MGlxFetchContext/*, |
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46 public MGlxResolutionChangeObserver*/ |
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47 { |
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48 public: |
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49 /** |
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50 * Constructor |
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51 * @param aIterator Iterator that determines the order of thumbnail |
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52 * retrieval and for which items thumbnails are and are not retrieved |
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53 */ |
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54 IMPORT_C static CGlxThumbnailContext* NewL(MGlxMediaListIterator* aIterator); |
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55 |
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56 /** |
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57 * Constructor |
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58 * @param aIterator Iterator that determines the order of thumbnail |
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59 * retrieval and for which items thumbnails are and are not retrieved |
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60 */ |
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61 IMPORT_C CGlxThumbnailContext(MGlxMediaListIterator* aIterator); |
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62 IMPORT_C ~CGlxThumbnailContext(); |
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63 |
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64 /** |
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65 * Adds a fetch specification for an individual item |
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66 * @param aWidth the width of required bitmap. The context |
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67 * may retrieve first a thumbnail of difference size |
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68 * if it thinks it helps user experience. |
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69 * @param aHeight the width of required bitmap. |
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70 * @param aFocusOffset Delta to focus. 0 means focus. |
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71 */ |
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72 IMPORT_C void AddSpecForItemL(TInt aWidth, TInt aHeight, TInt aFocusOffset); |
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73 |
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74 /** |
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75 * Sets the default fetch specification. The context uses this |
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76 * for all items that do not have a specific spec added. |
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77 * @param aWidth the width of required bitmap. The context |
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78 * may retrieve first a thumbnail of difference size |
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79 * if it thinks it helps user experience. |
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80 * @param aHeight the heigth of required bitmap. |
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81 */ |
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82 IMPORT_C void SetDefaultSpec(TInt aWidth, TInt aHeight); |
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83 |
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84 /** |
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85 * Set whether only high quality thumbnails are wanted. |
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86 * @param aHighQualityOnly ETrue to skip fetching low quality thumbnails. |
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87 */ |
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88 IMPORT_C void SetHighQualityOnly( TBool aHighQualityOnly ); |
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89 |
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90 public: // From MGlxFetchContext |
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91 /// See @ref MGlxFetchContext::AttributeRequestL |
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92 TInt AttributeRequestL(const MGlxMediaList* aList, RArray<TInt>& aItemIndices, |
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93 RArray<TMPXAttribute>& aAttributes, CMPXAttributeSpecs*& aDetailedSpecs) const; |
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94 |
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95 /// See @ref MGlxFetchContext::AllAttributesL |
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96 void AllAttributesL(const MGlxMediaList* aList, TInt aListIndex, |
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97 RArray<TMPXAttribute>& aAttributes) const; |
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98 |
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99 /// See @ref MGlxFetchContext::RequestCountL |
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100 TInt RequestCountL(const MGlxMediaList* aList) const; |
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101 |
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102 protected: |
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103 /** |
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104 * 2nd phase construction |
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105 */ |
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106 void ConstructL(); |
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107 |
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108 private: // From MGlxResolutionChangeObserver |
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109 // void HandleResolutionChangedL(); |
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110 |
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111 private: |
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112 /** |
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113 * Select the best thumbnail for processing |
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114 * |
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115 * @param aList pointer to media list |
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116 * @param aError indication of any errors encountered when selecting item |
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117 */ |
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118 TInt SelectItemL(const MGlxMediaList* aList, TInt& aError) const; |
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119 |
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120 /** |
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121 * Calculates a score for thumbnail retrieval |
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122 * |
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123 * @param aIndexInList index of the item in the list |
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124 * @param aList pointer to media list |
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125 * @param aDistance Distance from highest priority index |
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126 * @param aError indication of any errors encountered when calculating score |
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127 * |
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128 * @returns a score of how important processing this item's |
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129 * thumbnail is. The higher, the more important. |
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130 */ |
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131 TUint GetThumbnailScoreL(TInt aIndexInList, const MGlxMediaList* aList, |
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132 TInt aDistance, TInt& aError) const; |
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133 |
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134 /** Item to specify what kind of thumbnail is needed */ |
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135 struct TFetchSpec |
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136 { |
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137 inline TFetchSpec() { iPossWidth = 0; iPossHeight = 0; }; |
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138 |
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139 /** Width of the thumbnail */ |
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140 TReal32 iPossWidth; |
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141 |
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142 /** Height of the thumbnail */ |
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143 TReal32 iPossHeight; |
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144 }; |
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145 |
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146 /** |
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147 * Item to specify what kind of thumbnail is needed |
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148 * for which item (compared to focus) |
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149 */ |
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150 struct TAssignedFetchSpec : public TFetchSpec |
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151 { |
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152 inline TAssignedFetchSpec() { iFocusOffset = 0; }; |
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153 |
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154 /** Compares two specs by focus offset. Used for RArray::Find() */ |
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155 static TBool Match( const TAssignedFetchSpec& aSpec1, |
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156 const TAssignedFetchSpec& aSpec2 ); |
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157 |
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158 /** Delta to focus. If zero, then focused item */ |
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159 TInt iFocusOffset; |
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160 }; |
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161 |
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162 /** |
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163 * Get the fetch spec to be used for a given media item. |
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164 * @param aListIndex Index of current item |
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165 * @param aList Pointer to media list |
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166 * @return Reference to fetch spec to use for the given item. |
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167 */ |
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168 const TFetchSpec& SpecForIndex(TInt aListIndex, |
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169 const MGlxMediaList* aList) const; |
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170 |
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171 /** |
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172 * Get the size in pixels for a fetch spec. |
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173 * @param aSpec Reference to fetch spec. |
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174 * @return Size in pixels for the current screen resolution. |
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175 */ |
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176 TSize SizeFromSpec( const TFetchSpec& aSpec ) const; |
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177 |
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178 /** |
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179 * Check whether a given item has any full thumbnail attributes. |
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180 * @param aItem Media item to check. |
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181 * @return ETrue if a full thumbnail attribute is present. |
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182 */ |
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183 TBool HasFullThumbnail( const TGlxMedia& aItem ) const; |
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184 |
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185 /** |
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186 * Check DRM status of item at given index. Updates the fetch spec |
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187 * for an item with invalid DRM |
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188 * @param aListIndex index of current item |
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189 * @param aList pointer to media list |
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190 * @param aSpec reference to fetch spec |
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191 * @return ETrue if the item at index is not protected or has valid rights |
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192 */ |
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193 TBool CheckDRMStatusL( TInt aListIndex, const MGlxMediaList* aList, |
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194 TSize& aSize ) const; |
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195 |
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196 private: |
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197 /** Specs applies to individual items */ |
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198 RArray<TAssignedFetchSpec> iSpecs; |
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199 |
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200 /** Request spec that is applied to all other items than in iSpecs */ |
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201 TFetchSpec iDefaultSpec; |
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202 |
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203 /** Whether to skip fetching low quality thumbnails */ |
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204 TBool iHighQualityOnly; |
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205 |
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206 /** Iterator for traversing the list */ |
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207 MGlxMediaListIterator* iIterator; |
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208 |
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209 /** Cache manager interface (owned) */ |
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210 MGlxCache* iCache; |
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211 |
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212 /** Utility to translate between pixels and poss units */ |
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213 CGlxResolutionUtility* iResolutionUtility; |
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214 |
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215 /** DRM utility for checking rights */ |
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216 CGlxDRMUtility* iDrmUtility; |
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217 |
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218 /** Attribute context to fetch DRM attributes */ |
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219 CGlxAttributeContext* iDrmFetchContext; |
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220 |
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221 /** Size of the default spec */ |
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222 TSize iDefaultSpecSize; |
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223 }; |
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224 |
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225 /** |
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226 * CGlxDefaultAttributeContext |
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227 * |
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228 * Fetch context to retrieve MPX attributes starting from focus outward |
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229 * |
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230 * @lib glxmedialists.lib |
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231 */ |
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232 class CGlxDefaultThumbnailContext : public CGlxThumbnailContext |
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233 { |
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234 public: |
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235 IMPORT_C static CGlxDefaultThumbnailContext* NewL(); |
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236 IMPORT_C ~CGlxDefaultThumbnailContext(); |
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237 |
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238 /** |
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239 * Set the range offsets. These determine the outer limits |
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240 * of attributes to be retrieved, compared to current focus in |
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241 * the list |
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242 * If ranges not defined, retrieves the attributes for focused item only |
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243 */ |
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244 IMPORT_C void SetRangeOffsets(TInt aFrontOffset, TInt aRearOffset); |
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245 |
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246 private: |
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247 CGlxDefaultThumbnailContext(); |
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248 |
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249 private: |
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250 TGlxFromFocusOutwardIterator iFromFocusIterator; |
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251 }; |
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252 |
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253 #endif // C_GLXTHUMBNAILCONTEXT_H |
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254 |