author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Wed, 23 Jun 2010 18:02:44 +0300 | |
changeset 46 | efe85016a067 |
parent 40 | b46a585f6909 |
child 47 | 7cbcb2896f0e |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: Class for asynchronously fetching and caching |
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* basic contact info for list views. |
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* |
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*/ |
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|
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#ifndef CNTCACHE_H |
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#define CNTCACHE_H |
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#include <QObject> |
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#include <QSharedData> |
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#include <HbIcon> |
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#include <qcontactmanager.h> |
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#include <cntinfoprovider.h> |
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class CntContactInfoData; |
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class CntCacheThread; |
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class CntInfoCacheItem; |
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class CntIconCacheItem; |
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QTM_USE_NAMESPACE |
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/* |
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Info about one contact that can be used by listviews: |
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- the id |
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- the full name, properly formatted |
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- text, secondary information like phone number |
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- icon1, the main icon |
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- icon2, a secondary icon |
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*/ |
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class CntContactInfo : public QObject |
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{ |
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Q_OBJECT |
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public: |
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CntContactInfo(); |
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CntContactInfo(int id, const QString& name, const QString& text, const HbIcon& icon1, const HbIcon& icon2); |
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~CntContactInfo(); |
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CntContactInfo(const CntContactInfo& other); |
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CntContactInfo& operator=(const CntContactInfo& other); |
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int id() const; |
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QString name() const; |
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QString text() const; |
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HbIcon icon1() const; |
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HbIcon icon2() const; |
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private: |
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QSharedDataPointer<CntContactInfoData> d; |
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}; |
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/* |
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Singleton class that acts as a proxy to get CntContactInfo objects for contacts. |
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It also implements caching for faster access. This is why the fetchContactInfo() |
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function takes a row number and the full list of contact IDs rather than just a |
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contact ID -- the former allows caching ahead. |
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|
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The usage pattern for clients is to call fetchContactInfo() to get at least the |
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name of the contact. If all the info is cached then it will be provided. If not, |
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then the uncached info is fetched asynchronously and contactInfoUpdated signals |
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are emitted as the pieces of information arrive -- up to three times per contact; |
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once for text, once for icon1 and once for icon2. |
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*/ |
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class CntCache : public QObject |
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{ |
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friend class TestCntCache; |
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friend class TestCntListModel; |
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Q_OBJECT |
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public: |
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static CntCache* instance(); |
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CntContactInfo fetchContactInfo(int row, const QList<QContactLocalId>& idList); |
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public slots: |
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void clearCache(); |
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signals: |
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void contactInfoUpdated(QContactLocalId contactId); |
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private: |
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CntCache(); |
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~CntCache(); |
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bool fetchContactName(int contactId, QString& contactName); |
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void updateReadAheadCache(int mostRecentRow, const QList<QContactLocalId>& idList); |
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CntInfoCacheItem* createInfoCacheItem(int contactId); |
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CntIconCacheItem* createIconCacheItem(const QString& iconName); |
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void emitContactInfoUpdated(int contactId); |
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private slots: |
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void onNewInfo(int contactId, const ContactInfoField& infoField, const QString& infoValue); |
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void onInfoCancelled(int contactId); |
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void onNewIcon(const QString& iconName, const HbIcon& icon); |
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void onIconCancelled(const QString& iconName); |
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void onShutdown(); |
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void updateContactsInCache(const QList<QContactLocalId>& contactIds); |
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void removeContactsFromCache(const QList<QContactLocalId>& contactIds); |
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void scheduleOneReadAheadItem(); |
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private: |
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static CntCache* mInstance; // the one and only instance of CntCache |
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QContactManager* mContactManager; // for fetching contact names and for getting |
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// notifications about changes to contacts |
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CntCacheThread* mWorker; // the background thread that does the actual fetching |
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QList<int> mReadAheadCache; // cache with set of IDs to prefetch (they are likely to be needed soon) |
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QHash<int,CntInfoCacheItem*> mInfoCache; // cache with contact info, indexed by contact ids |
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QHash<QString,CntIconCacheItem*> mIconCache; // cache with icons, indexed by icon name |
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int mNextInfoCacheOrder; // cache order for the next item to be updated/inserted in info cache |
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int mNextIconCacheOrder; // cache order for the next item to be updated/inserted in icon cache |
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int mEmittedContactId; // id of the last contact emitted to UI |
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}; |
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#endif |