taskswitcher/utils/inc/tswindowgroupsobserver.h
author hgs
Mon, 13 Sep 2010 13:26:33 +0300
changeset 116 305818acdca4
child 119 50e220be30d1
permissions -rw-r--r--
201036
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/*
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 * Copyright (c) 2009 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 :
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 *
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 */
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#ifndef TSWINDOWGROUPSOBSERVER_H
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#define TSWINDOWGROUPSOBSERVER_H
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#include "tsresourcemanager.h"
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/**
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 * Interface declare mathods to notify about window server events
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 */
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class MTsWindowGroupsObserver
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{
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public:
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    /**
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     * Method notidy about window group changes.
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     * @param rsc - resource manager
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     * @param wgs - list of window groups associated with running applications
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     */
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    virtual void HandleWindowGroupChanged(MTsResourceManager &rsc, 
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                                          const TArray<RWsSession::TWindowGroupChainInfo> & wgs) =0;
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};
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/**
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 * Interface declare methods to subscribe windo server events
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 */
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class MTsWindowGroupsMonitor
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{
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public:
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    /**
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     * Method make subscription for window server events
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     * @param observer - events observer
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     */
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    virtual void SubscribeL(MTsWindowGroupsObserver & observer) =0;
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    /**
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     * Method cancel subscription for window server events
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     * @param observer - events observer
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     */
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    virtual void Cancel(MTsWindowGroupsObserver &) =0;
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};
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/**
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 * Window server observer implementation. Class automaticly subscribe / cancel subscription
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 * at construction / destruction level.
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 * 
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 */
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class CTsWindowGroupsObserver: public CBase,
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                               public MTsWindowGroupsObserver
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{
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public:
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    /**
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     * Destructor
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     * Function automaticly cancel subscrption to window server events
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     */
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    ~CTsWindowGroupsObserver();
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protected:
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    /**
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     * First phase constructor
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     */
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    CTsWindowGroupsObserver(MTsWindowGroupsMonitor &);
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    /**
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     * Second phase constructor.
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     * Function automaticly subscribe window server events
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     */
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    void BaseConstructL();
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private:
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    MTsWindowGroupsMonitor & mMonitor;
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};
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/**
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 * Window server monitor implementation.
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 */
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class CTsWindowGroupsMonitor: public CActive, 
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                              public MTsWindowGroupsMonitor
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{
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public:
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    /**
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     * Two phase constructor
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     */
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    static CTsWindowGroupsMonitor* NewL(MTsResourceManager &);
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    /**
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     * Destructor
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     */
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    ~CTsWindowGroupsMonitor();
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    /**
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     * @see MTsWindowGroupsMonitor::SubscribeL
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     */
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    void SubscribeL(MTsWindowGroupsObserver &);
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    /**
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     * @see MTsWindowGroupsMonitor::Cancel
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     */
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    void Cancel(MTsWindowGroupsObserver &);
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protected:
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    /**
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     * @see CActive::RunL
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     */
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    void RunL();
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    /**
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     * @see CActive::DoCancel
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     */
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    void DoCancel();
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    /**
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     * @see CActive::RunError
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     */
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    TInt RunError(TInt error);
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private:
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    /**
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     * First phase constructor
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     */
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    CTsWindowGroupsMonitor(MTsResourceManager &);
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    /**
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     * Second phase constructor
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     */
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    void ConstructL();
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    /**
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     * Function subscribe for event to window server and activate object
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     */
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    void Subscribe();
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    /**
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     * Function provide window server event to observers
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     */
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    void ProvideEventL();
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    /**
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     * Function provide window server event to observer
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     */
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    void ProvideEventL(TWsEvent, MTsWindowGroupsObserver &);
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private:
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    /**
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     * Registry of subscribed observers
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     */
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    RPointerArray<MTsWindowGroupsObserver> mObservers;
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    /**
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     * Resources manager
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     */
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    MTsResourceManager &mResources;
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    /**
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     * Monitor window group
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     */
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    RWindowGroup mWg;
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};
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#endif //TSWINDOWGROUPSOBSERVER_H