/*

* Copyright (c) 2006-2006 Nokia Corporation and/or its subsidiary(-ies). 

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:    Command Handler Base

*

*/

#ifndef __C_GLXCOMMANDHANDLER_H__

#define __C_GLXCOMMANDHANDLER_H__

#include <e32base.h>

#include <coedef.h>

#include <w32std.h>

#include <mpxattribute.h>

class CEikMenuPane;

/**

 * CGlxCommandHandler

 * 

 * Command handler base

 */

class CGlxCommandHandler: public CBase

	{

public:

	IMPORT_C CGlxCommandHandler( TBool aHasToolbarItem = EFalse );	

	/**

	 * Execute the command, if applicable

	 * @param aCommand The command to handle

	 * @return ETrue iff command was handled

	 */

	virtual TBool ExecuteL(TInt aCommand) = 0;

	/**

	 * Modify a menu before it is displayed.

	 * @param aResourceId The resource ID of the menu

	 * @param aMenuPane The in-memory representation of the menu pane

	 */

	/**

	 * Called when the owning view is activated

	 * @param aViewId The ID of the view

	 */

	IMPORT_C void ActivateL(TInt aViewId);	

	/**

	 * Called when the owning view is deactivated

	 */

	virtual void Deactivate() = 0;

	/**

	 * Offers key events to the command handler

	 * @param aKeyEvent The key event. 

	 * @param aType The type of key event: EEventKey, EEventKeyUp or EEventKeyDown

	 * @return Indicates whether or not the key event was used by this control. EKeyWasNotConsumed or EKeyWasConsumed

	 */

	virtual TKeyResponse OfferKeyEventL(const TKeyEvent& aKeyEvent, TEventCode aType) = 0;

	/**

	 * Perform any actions needed before the options menu is displayed.

	 * The view calling this must first arrange a wait dialog to be displayed, as this operation may take

	 * a long time to complete

     * @param aResourceId Menu resource id

	 */

	virtual void PreDynInitMenuPaneL( TInt aResourceId ) = 0;

	/**

	 * Deriving classes should append required attributes to aAttributes

	 * @param aAttributes array to append attributes to.

	 * @param aFilterUsingSelection If ETrue, the deriving class should only append

	 *        attributes relevant to the current selection, If EFalse all attributes

	 *        should be appended.

	 * @param aFilterUsingCommandId If ETrue, only attributes relevant

	 *        to the command id specified by aCommandId will be appended

	 * @param aCommandId if aFilterUsingCommandId is ETrue, only

	 *        attributes relevant to aCommandId will be appened.

	 */

    virtual void GetRequiredAttributesL(RArray< TMPXAttribute >& aAttributes, 

    		                            TBool aFilterUsingSelection,

    		                            TBool aFilterUsingCommandId,

    		                            TInt aCommandId = 0) const = 0;

    /**

	 * Destructor

	 */

	IMPORT_C virtual ~CGlxCommandHandler();

protected:

	IMPORT_C virtual void DoActivateL(TInt aViewId);

	IMPORT_C virtual void PopulateToolbarL();

private:

	/** Whether the command should be enabled as a toolbar command*/

	TBool iHasToolbarItem;    

	};

#endif // __C_GLXCOMMANDHANDLER_H__