emailuis/uicomponents/inc/fstreevisualizerobserver.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 17 Dec 2009 08:39:21 +0200
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/*
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* Copyright (c) 2007 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:  An observer interface for the tree list component.
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*
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*/
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#ifndef M_FSTREEVISUALIZEROBSERVER_H
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#define M_FSTREEVISUALIZEROBSERVER_H
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#include "fstreelistconstants.h"
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/**
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 * MFsTreeObserver defines an interface which is used to observe tree list 
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 * events.
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 *
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 * Observer of the tree list is notified of changes in the tree list through 
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 * this interface with appropriate events.
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 * @code
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 *
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 * @endcode
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 *
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 * @lib 
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 */
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NONSHARABLE_CLASS( MFsTreeVisualizerObserver )
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    {
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public:
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    enum TFsTreeVisualizerEvent
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        {
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        // <cmail> "Base class modifications for using touch"
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        /**
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         * Action started for selected tree item.
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         */
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        EFsTreeItemTouchAction,
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        /**
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         * Long tap action started for selected tree item. 
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         */
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        EFsTreeItemTouchLongTap,
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        /**
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         * Touch focus for list gained. 
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         */
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        EFsTreeItemTouchFocused,    
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        // </cmail>
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        /**
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         * An item received focus.
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         */
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        EFsTreeItemFocused,
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        /**
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         * Focus will be moved to the specified item/node.
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         * Event triggered just before an item gets focus.
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         * No action required.
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         */
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        EFsTreeItemWillGetFocused,
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        /**
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         * An item has been selected.
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         */
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        EFsTreeItemSelected,
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        /**
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         * An item with menu has been selected.
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         */
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        EFsTreeItemWithMenuSelected,
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        /**
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         * Right arrow pressed.
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         */
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        EFsTreeKeyRightArrow,
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        /**
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         * Left arrow pressed.
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         */
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        EFsTreeKeyLeftArrow,
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        /**
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         * Event generated when the list is fully hidden.
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         */
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        EFsTreeListVisualizerHidden,
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        /**
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         * Event generated when the list is fully shown.
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         */
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        EFsTreeListVisualizerShown,
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        // <cmail>
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        /**
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         * Event generated when a single node is collapsed.
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         */
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        EFsTreeListItemCollapsed,
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        /**
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         * Event generated when a single node is expanded.
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         */
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        EFsTreeListItemExpanded,
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        /**
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         * Event generated when all nodes are collapsed.
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         */
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        EFsTreeListCollapsedAll,
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        /**
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         * Event generated when all nodes are expanded.
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         */
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        EFsTreeListExpandedAll
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        // </cmail>
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        };    
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public:
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    /**
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     * Observer of the tree list is notified of changes in the tree list
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     * through this function.
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     * 
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     * @param aEvent Event which happend in the tree list.
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     * @param aId Id of the node/item associated with the event. KFsTreeNoneID
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     *            means that the event is not associated with a node/item.
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     */
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    // <cmail> Touch
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    virtual void TreeVisualizerEventL( 
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            const TFsTreeVisualizerEvent aEvent, 
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            const TFsTreeItemId aId = KFsTreeNoneID ) const = 0;
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    // </cmail>
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    };
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#endif // M_FSTREEVISUALIZEROBSERVER_H