/*

* Copyright (c) 2008-2009 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:    MPX Command generating Command Handler

*

*/

#ifndef __C_GLXMPXCOMMANDCOMMANDHANDLER_H__

#define __C_GLXMPXCOMMANDCOMMANDHANDLER_H__

#include <AknProgressDialog.h>

#include <e32base.h>

#include <mpxcommand.h>

#include <mpxmessage.h>

#include "glxmedialistcommandhandler.h"

class MGlxMediaList;

class MGlxMediaListProvider;

class CAknAppUi;

class CGlxImageViewerManager;

/**

 * @class CGlxMpxCommandCommandHandler

 *  

 * Command handler that creates and issues an MPXCommand

 *

 * @ingroup glx_group_command_handlers

 *

 * @lib glxviewbase.lib

 */

class CGlxMpxCommandCommandHandler : public CGlxMediaListCommandHandler,

        public MGlxMediaListObserver, public MProgressDialogCallback

	{

public:	

	/**

	 * Constructor

	 * @param aMediaListProvider The owner of the media list to use

	 */

	IMPORT_C CGlxMpxCommandCommandHandler(MGlxMediaListProvider* aMediaListProvider, TBool aHasToolbarItem = EFalse );

	/**

	 * Destructor

	 */

	IMPORT_C virtual ~CGlxMpxCommandCommandHandler();

protected: // API for deriving classes

    /**

     * Attempts to "exit" the command handler

     * (Exit means closing the progress note and allowing user to do something.)

     * The command handler will exit if 

     *  - progress is complete <b>and</b> deriving class returns ETrue from OkToExit

     *  - aErrorCode is not KErrNone

     *

     * Usually deriving classes never need to call this. This is called

     * automatically after receiving a collection message. Only call if the 

     * completion can happen (= the result of OkToExit() call changes) based 

     * on another event than collection message.

     *

     * @param aErrorCode Error code. Shows an error note if other than KErrNone

     */

    IMPORT_C void TryExitL(TInt aErrorCode);

    /**

     * See @ref CGlxCommandHandler::DoActivateL 

     * Default implementation does nothing

     */

    IMPORT_C virtual void DoActivateL( TInt aViewId );

    /**

	* Called when the owning view is deactivated

	*/

	IMPORT_C virtual void Deactivate();

	/**

	 * Handles error

	 * Default implementation shows an error note

	 */

	IMPORT_C virtual void HandleErrorL(TInt aErrorCode);

    /**

     * Creates a command object, and decides whether to consume the command.

     * @param aList Media list to which the command will be issued.

     * @param aConsume Set this to false, if the command

     *                 id should not be consumed. Default value is true.

     * @return command object If NULL returned, no MPX command will be issued,

     *                        but the command id may still be consumed, depending

     *                        on the value of aDoNotConsume

     *                        Caller gets ownership of the command object.

     */

	virtual CMPXCommand* CreateCommandL(TInt aCommandId, MGlxMediaList& aList,

	    TBool& aConsume) const = 0;

	/**

	 * Handles a message other than progress message.

	 * Deriving classes can override this to receive and handle messages

	 * from media list (i.e., from MPX server)

	 * The default implementation does not do anything.

	 * @return Error code. If other than KErrNone, the command handler

	 *                     closes the progress note and shows an error note.

	 */

	IMPORT_C virtual TInt DoHandleMessageL(const CMPXMessage& aMessage,

	    MGlxMediaList& aList);

	/**

	 * Called by HandleCommandCompleteL() to allow derived classes

	 * to perform processing specific to individual command handlers.

	 * The defalut implementation does not do anything.

	 * 

	 */

	IMPORT_C virtual void DoHandleCommandCompleteL(TAny* aSessionId, 

            CMPXCommand* aCommandResult, TInt aError, MGlxMediaList* aList);

	/**

	 * Called by HandleCommandCompleteL() to allow derived classes

	 * to perform processing specific to individual command handlers.

	 * The defalut implementation does not do anything.

	 * 

	 */

	IMPORT_C virtual void DoHandleItemAddedL(TInt aStartIndex, TInt aEndIndex, MGlxMediaList* aList);

    /**

     * Called to check if the deriving class is ready and progress note

     * can be closed. The deriving class may be expecting a message (etc) after

     * the last progress notification is received, and by overriding

     * this class, they can wait for that info.

     * Default implementation returns ETrue.

     * @return ETrue if command handler is ready exit 

     */	    

	IMPORT_C virtual TBool OkToExit() const;

    /**

     * Creates and returns confirmation note text 

     * Deriving class can override this to get a confirmation note shown

     * before execution

     * @param aCommandId Id of the command that is about to be executed

     * @param aMultiSelection ETrue when more than one item is selected

     * @return New descriptor with confirmation note

     *         If single selection, the descriptor must contain %U, which 

     *         will be populated with the title of the selected/focused item

     *         If multiselection, the descriptor must contain %N, which 

     *         will be populated with the number of selected items

     *         Or return NULL, in which case no note will be shown and the command

     *         is simply executed.

     *         Caller gets ownership of the descriptor.

     *         Default implementation returns NULL.

     */

    IMPORT_C virtual HBufC* ConfirmationTextL(TInt aCommandId, TBool aMultiSelection) const;

    /**

     * Creates and returns progress note text 

     * Deriving class can override this to customise the progress note

     * @return New descriptor with progress text

     *         Or return NULL, in which case default progress text will be

     *         used 

     *         Default implementation returns default progress note

     *         Caller gets ownership of the descriptor.

     */

    IMPORT_C virtual HBufC* ProgressTextL(TInt aCommandId) const;

    /**

     * Creates and returns completion note text 

     * Deriving class can override this to show a completion note

     * @return New descriptor with completion text

     *         Or return NULL, in which case the note will not be shown

     *         Default implementation returns NULL

     *         Caller gets ownership of the descriptor.

     */

    IMPORT_C virtual HBufC* CompletionTextL() const;

private:

    /** See @ref CGlxMediaListCommandHandler::DoExecuteL */

	IMPORT_C virtual TBool DoExecuteL(TInt aCommandId, MGlxMediaList& aList);

	/**

	 * Launch a confirmation note (single or multiple depending on media list selection)

	 * Declared as virtual to allow deriving class to show non-media list dependent

	 * confirmation note, etc.

	 * @return ETrue if the user confirms, EFalse if user cancels

	 */	

	IMPORT_C virtual TBool ConfirmationNoteL(TInt aCommandId, MGlxMediaList& aMediaList) const;

	/**

	 * Launch a confirmation note (single)

	 * @return ETrue if the user confirms 

	 */	

	TBool ConfirmationNoteSingleL(TInt aCommandId, MGlxMediaList& aMediaList) const;

	/**

	 * Launch a confirmation note (multiple)

	 * @return ETrue if the user confirms 

	 */	

	TBool ConfirmationNoteMultipleL(TInt aCommandId, MGlxMediaList& aMediaList) const;

	/**

	 * Launch a progress note

	 */	

	void ProgressNoteL(TInt aCommandId);

    /**

     * Update progress based on message

     * @param aMessage message with progress info 

     * @param aError extracts an error code from message and returns in this argument

     * @param ETrue if progress complete. EFalse if note

     */

    TBool UpdateProgressL(const CMPXMessage& aMessage, TInt& aError);

	/**

	 * Dismiss the active progress note

	 */	

	void DismissProgressNoteL();

    /**

     * Show a completion note

     */

    void CompletionNoteL() const;

    /**

     * Remove medialist observer

     */

    void RemoveMediaListObserver();

    /**

     * Creates the image viewer instance, if not created already.

     */    

    void CreateImageViewerInstanceL();

    /**

     * Deletes the image viewer instance, if created already.

     */    

    void DeleteImageViewerInstance();

protected: // From MGlxMediaListObserver    

    /// See @ref MGlxMediaListObserver::HandleItemAddedL

    IMPORT_C void HandleItemAddedL(TInt aStartIndex, TInt aEndIndex, MGlxMediaList* aList);

    /// See @ref MGlxMediaListObserver::HandleMediaL

    IMPORT_C void HandleMediaL(TInt aListIndex, MGlxMediaList* aList);

    /// See @ref MGlxMediaListObserver::HandleItemRemovedL

    IMPORT_C void HandleItemRemovedL(TInt aStartIndex, TInt aEndIndex, MGlxMediaList* aList);

    /// See @ref MGlxMediaListObserver::HandleItemModifiedL

    IMPORT_C void HandleItemModifiedL(const RArray<TInt>& aItemIndexes, MGlxMediaList* aList);

    /// See @ref MGlxMediaListObserver::HandleAttributesAvailableL

    IMPORT_C void HandleAttributesAvailableL(TInt aItemIndex,     

        const RArray<TMPXAttribute>& aAttributes, MGlxMediaList* aList);

    /// See @ref MGlxMediaListObserver::HandleFocusChangedL

    IMPORT_C void HandleFocusChangedL(NGlxListDefs::TFocusChangeType aType, TInt aNewIndex, TInt aOldIndex, MGlxMediaList* aList);

    /// See @ref MGlxMediaListObserver::HandleItemSelectedL

    IMPORT_C void HandleItemSelectedL(TInt aIndex, TBool aSelected, MGlxMediaList* aList);

    /// See @ref MGlxMediaListObserver::HandleMessageL

    IMPORT_C void HandleMessageL(const CMPXMessage& aMessage, MGlxMediaList* aList);

    /// See @ref MGlxMediaListObserver::HandleCommandCompleteL

    IMPORT_C void HandleCommandCompleteL(TAny* aSessionId, CMPXCommand* aCommandResult, TInt aError, MGlxMediaList* aList);

public: // from MProgressDialogCallback

	IMPORT_C void DialogDismissedL(TInt aButtonId);

private:

    /// Progress dialog

	CAknProgressDialog* iProgressDialog;

	// Progress info for the progress dialog

	CEikProgressInfo* iProgressInfo;

    // CEikProgressInfo does not store whether progress is complete, so store here

	TBool iProgressComplete;

	// Resource offset

	mutable TInt iResourceOffset;

	/// Whether the GIF animation is currently halted

	TBool iAnimationStopped;

    /// The AppUI. Not owned

    CAknAppUi* iAppUi;

    // For image viewer, not own

    CGlxImageViewerManager* iImageViewerInstance;

	};

#endif // __C_GLXMPXCOMMANDCOMMANDHANDLER_H__