|
1 /* |
|
2 * Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies). |
|
3 * All rights reserved. |
|
4 * This component and the accompanying materials are made available |
|
5 * under the terms of "Eclipse Public License v1.0" |
|
6 * which accompanies this distribution, and is available |
|
7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
|
8 * |
|
9 * Initial Contributors: |
|
10 * Nokia Corporation - initial contribution. |
|
11 * |
|
12 * Contributors: |
|
13 * |
|
14 * Description: Fetch context to retrieve thumbnails |
|
15 * |
|
16 */ |
|
17 |
|
18 |
|
19 |
|
20 |
|
21 #ifndef C_GLXTHUMBNAILCONTEXT_H |
|
22 #define C_GLXTHUMBNAILCONTEXT_H |
|
23 |
|
24 #include <e32std.h> |
|
25 #include "mglxfetchcontext.h" |
|
26 #include "glxmedialistiterator.h" |
|
27 #include <mglxresolutionchangeobserver.h> |
|
28 |
|
29 // Forward declarations |
|
30 |
|
31 class CGlxAttributeContext; |
|
32 class CGlxDRMUtility; |
|
33 class CGlxResolutionUtility; |
|
34 class MGlxCache; |
|
35 class MGlxMediaList; |
|
36 class TGlxMedia; |
|
37 |
|
38 /** |
|
39 * CGlxThumbnailContext |
|
40 * |
|
41 * Fetch context to retrieve thumbnails |
|
42 * |
|
43 * @lib glxmedialists.lib |
|
44 */ |
|
45 class CGlxThumbnailContext : public CBase, public MGlxFetchContext, |
|
46 public MGlxResolutionChangeObserver |
|
47 { |
|
48 public: |
|
49 /** |
|
50 * Constructor |
|
51 * @param aIterator Iterator that determines the order of thumbnail |
|
52 * retrieval and for which items thumbnails are and are not retrieved |
|
53 */ |
|
54 IMPORT_C static CGlxThumbnailContext* NewL(MGlxMediaListIterator* aIterator); |
|
55 |
|
56 /** |
|
57 * Constructor |
|
58 * @param aIterator Iterator that determines the order of thumbnail |
|
59 * retrieval and for which items thumbnails are and are not retrieved |
|
60 */ |
|
61 IMPORT_C CGlxThumbnailContext(MGlxMediaListIterator* aIterator); |
|
62 IMPORT_C ~CGlxThumbnailContext(); |
|
63 |
|
64 /** |
|
65 * Adds a fetch specification for an individual item |
|
66 * @param aWidth the width of required bitmap. The context |
|
67 * may retrieve first a thumbnail of difference size |
|
68 * if it thinks it helps user experience. |
|
69 * @param aHeight the width of required bitmap. |
|
70 * @param aFocusOffset Delta to focus. 0 means focus. |
|
71 */ |
|
72 IMPORT_C void AddSpecForItemL(TInt aWidth, TInt aHeight, TInt aFocusOffset); |
|
73 |
|
74 /** |
|
75 * Sets the default fetch specification. The context uses this |
|
76 * for all items that do not have a specific spec added. |
|
77 * @param aWidth the width of required bitmap. The context |
|
78 * may retrieve first a thumbnail of difference size |
|
79 * if it thinks it helps user experience. |
|
80 * @param aHeight the heigth of required bitmap. |
|
81 */ |
|
82 IMPORT_C void SetDefaultSpec(TInt aWidth, TInt aHeight); |
|
83 |
|
84 /** |
|
85 * Set whether only high quality thumbnails are wanted. |
|
86 * @param aHighQualityOnly ETrue to skip fetching low quality thumbnails. |
|
87 */ |
|
88 IMPORT_C void SetHighQualityOnly( TBool aHighQualityOnly ); |
|
89 |
|
90 public: // From MGlxFetchContext |
|
91 /// See @ref MGlxFetchContext::AttributeRequestL |
|
92 TInt AttributeRequestL(const MGlxMediaList* aList, RArray<TInt>& aItemIndices, |
|
93 RArray<TMPXAttribute>& aAttributes, CMPXAttributeSpecs*& aDetailedSpecs) const; |
|
94 |
|
95 /// See @ref MGlxFetchContext::AllAttributesL |
|
96 void AllAttributesL(const MGlxMediaList* aList, TInt aListIndex, |
|
97 RArray<TMPXAttribute>& aAttributes) const; |
|
98 |
|
99 /// See @ref MGlxFetchContext::RequestCountL |
|
100 TInt RequestCountL(const MGlxMediaList* aList) const; |
|
101 |
|
102 protected: |
|
103 /** |
|
104 * 2nd phase construction |
|
105 */ |
|
106 void ConstructL(); |
|
107 |
|
108 private: // From MGlxResolutionChangeObserver |
|
109 void HandleResolutionChangedL(); |
|
110 |
|
111 private: |
|
112 /** |
|
113 * Select the best thumbnail for processing |
|
114 * |
|
115 * @param aList pointer to media list |
|
116 * @param aError indication of any errors encountered when selecting item |
|
117 */ |
|
118 TInt SelectItemL(const MGlxMediaList* aList, TInt& aError) const; |
|
119 |
|
120 /** |
|
121 * Calculates a score for thumbnail retrieval |
|
122 * |
|
123 * @param aIndexInList index of the item in the list |
|
124 * @param aList pointer to media list |
|
125 * @param aDistance Distance from highest priority index |
|
126 * @param aError indication of any errors encountered when calculating score |
|
127 * |
|
128 * @returns a score of how important processing this item's |
|
129 * thumbnail is. The higher, the more important. |
|
130 */ |
|
131 TUint GetThumbnailScoreL(TInt aIndexInList, const MGlxMediaList* aList, |
|
132 TInt aDistance, TInt& aError) const; |
|
133 |
|
134 /** Item to specify what kind of thumbnail is needed */ |
|
135 struct TFetchSpec |
|
136 { |
|
137 inline TFetchSpec() { iPossWidth = 0; iPossHeight = 0; }; |
|
138 |
|
139 /** Width of the thumbnail */ |
|
140 TReal32 iPossWidth; |
|
141 |
|
142 /** Height of the thumbnail */ |
|
143 TReal32 iPossHeight; |
|
144 }; |
|
145 |
|
146 /** |
|
147 * Item to specify what kind of thumbnail is needed |
|
148 * for which item (compared to focus) |
|
149 */ |
|
150 struct TAssignedFetchSpec : public TFetchSpec |
|
151 { |
|
152 inline TAssignedFetchSpec() { iFocusOffset = 0; }; |
|
153 |
|
154 /** Compares two specs by focus offset. Used for RArray::Find() */ |
|
155 static TBool Match( const TAssignedFetchSpec& aSpec1, |
|
156 const TAssignedFetchSpec& aSpec2 ); |
|
157 |
|
158 /** Delta to focus. If zero, then focused item */ |
|
159 TInt iFocusOffset; |
|
160 }; |
|
161 |
|
162 /** |
|
163 * Get the fetch spec to be used for a given media item. |
|
164 * @param aListIndex Index of current item |
|
165 * @param aList Pointer to media list |
|
166 * @return Reference to fetch spec to use for the given item. |
|
167 */ |
|
168 const TFetchSpec& SpecForIndex(TInt aListIndex, |
|
169 const MGlxMediaList* aList) const; |
|
170 |
|
171 /** |
|
172 * Get the size in pixels for a fetch spec. |
|
173 * @param aSpec Reference to fetch spec. |
|
174 * @return Size in pixels for the current screen resolution. |
|
175 */ |
|
176 TSize SizeFromSpec( const TFetchSpec& aSpec ) const; |
|
177 |
|
178 /** |
|
179 * Check whether a given item has any full thumbnail attributes. |
|
180 * @param aItem Media item to check. |
|
181 * @return ETrue if a full thumbnail attribute is present. |
|
182 */ |
|
183 TBool HasFullThumbnail( const TGlxMedia& aItem ) const; |
|
184 |
|
185 /** |
|
186 * Check DRM status of item at given index. Updates the fetch spec |
|
187 * for an item with invalid DRM |
|
188 * @param aListIndex index of current item |
|
189 * @param aList pointer to media list |
|
190 * @param aSpec reference to fetch spec |
|
191 * @return ETrue if the item at index is not protected or has valid rights |
|
192 */ |
|
193 TBool CheckDRMStatusL( TInt aListIndex, const MGlxMediaList* aList, |
|
194 TSize& aSize ) const; |
|
195 |
|
196 private: |
|
197 /** Specs applies to individual items */ |
|
198 RArray<TAssignedFetchSpec> iSpecs; |
|
199 |
|
200 /** Request spec that is applied to all other items than in iSpecs */ |
|
201 TFetchSpec iDefaultSpec; |
|
202 |
|
203 /** Whether to skip fetching low quality thumbnails */ |
|
204 TBool iHighQualityOnly; |
|
205 |
|
206 /** Iterator for traversing the list */ |
|
207 MGlxMediaListIterator* iIterator; |
|
208 |
|
209 /** Cache manager interface (owned) */ |
|
210 MGlxCache* iCache; |
|
211 |
|
212 /** Utility to translate between pixels and poss units */ |
|
213 CGlxResolutionUtility* iResolutionUtility; |
|
214 |
|
215 /** DRM utility for checking rights */ |
|
216 CGlxDRMUtility* iDrmUtility; |
|
217 |
|
218 /** Attribute context to fetch DRM attributes */ |
|
219 CGlxAttributeContext* iDrmFetchContext; |
|
220 |
|
221 /** Size of the default spec */ |
|
222 TSize iDefaultSpecSize; |
|
223 }; |
|
224 |
|
225 /** |
|
226 * CGlxDefaultAttributeContext |
|
227 * |
|
228 * Fetch context to retrieve MPX attributes starting from focus outward |
|
229 * |
|
230 * @lib glxmedialists.lib |
|
231 */ |
|
232 class CGlxDefaultThumbnailContext : public CGlxThumbnailContext |
|
233 { |
|
234 public: |
|
235 IMPORT_C static CGlxDefaultThumbnailContext* NewL(); |
|
236 IMPORT_C ~CGlxDefaultThumbnailContext(); |
|
237 |
|
238 /** |
|
239 * Set the range offsets. These determine the outer limits |
|
240 * of attributes to be retrieved, compared to current focus in |
|
241 * the list |
|
242 * If ranges not defined, retrieves the attributes for focused item only |
|
243 */ |
|
244 IMPORT_C void SetRangeOffsets(TInt aFrontOffset, TInt aRearOffset); |
|
245 |
|
246 private: |
|
247 CGlxDefaultThumbnailContext(); |
|
248 |
|
249 private: |
|
250 TGlxFromFocusOutwardIterator iFromFocusIterator; |
|
251 }; |
|
252 |
|
253 #endif // C_GLXTHUMBNAILCONTEXT_H |
|
254 |