appfw/viewserver/inc/VWSDEF.H
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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// Copyright (c) 1999-2009 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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#ifndef __VWSDEF_H__
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#define __VWSDEF_H__
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#include <e32std.h>
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#ifndef SYMBIAN_ENABLE_SPLIT_HEADERS
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/**
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@publishedPartner
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@released
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*/
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#define KUidCustomCrossCheckValue 0x80282748
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/**
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@publishedPartner
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@released
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*/
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const TUid KUidCustomCrossCheck={KUidCustomCrossCheckValue};
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#endif //SYMBIAN_ENABLE_SPLIT_HEADERS
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class TVwsViewId
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/** Identifies an application view using two unique identifiers (UIDs): a view 
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UID and an application UID. 
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The application UID is required so that the application associated with the view 
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can be started if it is not already running.
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@publishedAll 
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@released */
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	{
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public:
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	inline TVwsViewId();
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	inline TVwsViewId(const TVwsViewId& aUid);
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	inline TVwsViewId(TUid aAppUid,TUid aViewUid);
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	inline TBool operator==(const TVwsViewId& aUid) const;
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	inline TBool operator!=(const TVwsViewId& aUid) const;
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public:
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	/** A unique application ID (or application UID).
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	Uniquely identifies the application associated with the view. */
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	TUid iAppUid;
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	/** A unique view ID (or view UID).
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	Uniquely identifies the view. */
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	TUid iViewUid;
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	};
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#ifndef SYMBIAN_ENABLE_SPLIT_HEADERS
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/**
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@internalTechnology
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@released
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*/
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#define KNullViewId TVwsViewId(KNullUid,KNullUid)
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/**
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@internalTechnology
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@released
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*/
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const TInt KErrViewWrongMode=1; // !!! Wrong error code - should be -ve & unique
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#endif //SYMBIAN_ENABLE_SPLIT_HEADERS
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class TVwsViewIdAndMessage
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/**
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The TVwsViewIdAndMessage class identifies a view and encapsulates a message to
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be read by the view when it is activated.
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@publishedAll 
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@released 
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*/
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	{
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public:
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	inline TVwsViewIdAndMessage();
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	inline TVwsViewIdAndMessage(const TVwsViewId& aId);
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	inline TVwsViewIdAndMessage(const TVwsViewId& aId,TUid aCustomMessageId,const TDesC8& aCustomMessage);
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	inline TVwsViewIdAndMessage& operator=(const TVwsViewIdAndMessage& aVwsViewIdAndMessage);
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public:
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	TVwsViewId iViewId;
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	TUid iCustomMessageId;
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	TInt iCustomMessageLength;
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	TPtrC8 iCustomMessage;
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	};
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#ifndef SYMBIAN_ENABLE_SPLIT_HEADERS
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class TVwsViewEvent
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/**
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The TVwsViewEvent class encapsulates the attributes of a view server event.
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These are:
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- The event type
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- The view ids of the two views associated with the event
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- The attributes of any message which can go with the event.
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@publishedPartner
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@released 
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*/
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	{
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public:
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	enum TVwsViewEventType
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		{
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		EVwsActivateView,
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		EVwsDeactivateView,
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		EVwsScreenDeviceChanged,
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		EVwsDeactivationNotification,
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		EVwsActivationNotification,
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		EVwsDeactivateViewDifferentInstance
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		};
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public:
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	inline TVwsViewEvent();
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	inline TVwsViewEvent(TVwsViewEventType aEventType);
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	inline TVwsViewEvent(TVwsViewEventType aEventType,const TVwsViewId& aViewOneId);
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	inline TVwsViewEvent(TVwsViewEventType aEventType,const TVwsViewId& aViewOneId,const TVwsViewId& aViewTwoId);
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	inline TVwsViewEvent(TVwsViewEventType aEventType,const TVwsViewId& aViewOneId,const TVwsViewId& aViewTwoId,TUid aCustomMessageId,TInt aCustomMessageLength);
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public:
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	/**
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	The event type.
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	*/
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	TVwsViewEventType iEventType;
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	/**
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	The first view id associated with the event. This has a different meaning for each of the event types:
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	- For ActivateView events, it is the view to activate
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	- For DeactivateView events, it is the view to deactivate
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	- For ScreenDeviceChange events, it is the id of the currently active view
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	- For ActivationNotification events, it is the id of the activated view
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	- For DeactivationNotification events, it is the id of the deactivated view
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	*/
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	TVwsViewId iViewOneId;
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	/**
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	The second view id associated with the event. This has a different meaning for each of the event types:
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	- For ActivateView events, it is the view that will be deactivated
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	- For DeactivateView events, it is the view that has been activated
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	- For ScreenDeviceChange events, it is unused
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	- For ActivationNotification events, it is the view that will be deactivated
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	- For DeactivationNotification events, it is the id of the view that has been activated
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	*/
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	TVwsViewId iViewTwoId;
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	/**
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	The type of message being passed in the custom message buffer
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	*/
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	TUid iCustomMessageId;
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	/**
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	The length of the custom message being held by the server.
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	To retrieve the message itself from the server, a buffer of this length must be allocated
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	*/
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	TInt iCustomMessageLength;
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	};
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//
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// Typedefs.
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//
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/**
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@internalComponent
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@released
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*/
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typedef TPckgBuf<TVwsViewIdAndMessage> TVwsViewIdAndMessageBuf;
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/**
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@internalComponent
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@released
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*/
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typedef TPckgBuf<TVwsViewEvent> TVwsViewEventBuf;
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#endif //SYMBIAN_ENABLE_SPLIT_HEADERS
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//
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// Inlines
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//
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inline TVwsViewId::TVwsViewId()
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/** Constructs a TVwsViewId object, and initialises both the application UID and 
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the view UID to NULL. */
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	: iAppUid(KNullUid), iViewUid(KNullUid) {}
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inline TVwsViewId::TVwsViewId(const TVwsViewId& aUid)
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/** Constructs a new TVwsViewId object from an existing one. This simply performs 
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a member-wise copy, each member variable of the passed in object is individually 
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copied to the corresponding member variable of the new object.
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@param aUid A reference to the TVwsViewId object to be copied. */
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	: iAppUid(aUid.iAppUid), iViewUid(aUid.iViewUid) {}
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inline TVwsViewId::TVwsViewId(TUid aAppUid,TUid aViewUid)
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/** Constructs a TVwsViewId object with the specified application UID and view UID.
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@param aAppUid The application UID.
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@param aViewUid The view UID. */
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	: iAppUid(aAppUid), iViewUid(aViewUid) {}
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inline TBool TVwsViewId::operator==(const TVwsViewId& aUid) const
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/** Checks whether the TVwsViewId object being operated upon and the TVwsViewId 
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object specified are the same.
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Returns true if both application UIDs and both view UIDs are the same, otherwise 
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returns false.
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@param aUid A reference to a TVwsViewId object.
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@return ETrue if objects are the same, EFalse otherwise. */
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	{
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	return (aUid.iAppUid==iAppUid && aUid.iViewUid==iViewUid);
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	}
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inline TBool TVwsViewId::operator!=(const TVwsViewId& aUid) const
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/** Checks whether the TVwsViewId object being operated upon and the TVwsViewId 
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object specified are different.
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Returns true if either the application UIDs or view UIDs are different, otherwise 
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returns false.
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@param aUid A reference to a TVwsViewId object.
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@return ETrue if objects are different, EFalse otherwise. */
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	{
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	return (aUid.iAppUid!=iAppUid || aUid.iViewUid!=iViewUid);
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	}
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/** Constructs a TVwsViewIdAndMessage object, and initialises it to contain a
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NULL view UID and an empty message */
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inline TVwsViewIdAndMessage::TVwsViewIdAndMessage()
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	: iViewId(TVwsViewId()), iCustomMessageLength(0)
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	{
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	iCustomMessageId.iUid=0;
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	iCustomMessage.Set(KNullDesC8);
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	}
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/** Constructs a TVwsViewIdAndMessage object, and initialises it to contain the
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specified view UID and an empty message
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@param aId A reference to the TVwsViewId to be used
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*/
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inline TVwsViewIdAndMessage::TVwsViewIdAndMessage(const TVwsViewId& aId)
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	: iViewId(aId), iCustomMessageLength(0)
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	{
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	iCustomMessageId.iUid=0;
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	iCustomMessage.Set(KNullDesC8);
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	}
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/** Constructs a TVwsViewIdAndMessage object, and initialises it to contain the
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specified view UID and the specified message
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@param aId A reference to the TVwsViewId to be used
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@param aCustomMessageId The message Id to use
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@param aCustomMessage A narrow descriptor containing the message
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*/
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inline TVwsViewIdAndMessage::TVwsViewIdAndMessage(const TVwsViewId& aId,TUid aCustomMessageId,const TDesC8& aCustomMessage)
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	: iViewId(aId), iCustomMessageId(aCustomMessageId)
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	{
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	iCustomMessageLength=aCustomMessage.Length();
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	iCustomMessage.Set(aCustomMessage);
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	}
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/** Copies the contents of another TVwsViewIdAndMessage into this one
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@param aVwsViewIdAndMessage A reference to the TVwsViewIdAndMessage to be copied
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@return A reference to the object being copied into
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*/
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inline TVwsViewIdAndMessage& TVwsViewIdAndMessage::operator=(const TVwsViewIdAndMessage& aVwsViewIdAndMessage)
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	{
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	iViewId=aVwsViewIdAndMessage.iViewId;
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	iCustomMessageId=aVwsViewIdAndMessage.iCustomMessageId;
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	iCustomMessageLength=aVwsViewIdAndMessage.iCustomMessage.Length();
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	iCustomMessage.Set(aVwsViewIdAndMessage.iCustomMessage);
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	return(*this);
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	}
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#ifndef SYMBIAN_ENABLE_SPLIT_HEADERS
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inline TVwsViewEvent::TVwsViewEvent() {}
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inline TVwsViewEvent::TVwsViewEvent(TVwsViewEventType aEventType)
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	: iEventType(aEventType),iViewOneId(),iViewTwoId(),iCustomMessageId(KNullUid),iCustomMessageLength(0) {}
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inline TVwsViewEvent::TVwsViewEvent(TVwsViewEventType aEventType,const TVwsViewId& aViewOneId)
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	: iEventType(aEventType),iViewOneId(aViewOneId),iViewTwoId(),iCustomMessageId(KNullUid),iCustomMessageLength(0) {}
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inline TVwsViewEvent::TVwsViewEvent(TVwsViewEventType aEventType,const TVwsViewId& aViewOneId,const TVwsViewId& aViewTwoId)
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	: iEventType(aEventType),iViewOneId(aViewOneId),iViewTwoId(aViewTwoId),iCustomMessageId(KNullUid),iCustomMessageLength(0) {}
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inline TVwsViewEvent::TVwsViewEvent(TVwsViewEventType aEventType,const TVwsViewId& aViewOneId,const TVwsViewId& aViewTwoId,TUid aCustomMessageId,TInt aCustomMessageLength)
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	: iEventType(aEventType),iViewOneId(aViewOneId),iViewTwoId(aViewTwoId),iCustomMessageId(aCustomMessageId),iCustomMessageLength(aCustomMessageLength) {}
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#endif //SYMBIAN_ENABLE_SPLIT_HEADERS
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#endif