/*

* Copyright (c) 2008 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:  Declaration for the common base class for all FsEmailUi views.

*                The class is not intended for instantation.

*

*/

#ifndef __FREESTYLEEMAILUI_VIEWBASE_H__

#define __FREESTYLEEMAILUI_VIEWBASE_H__

#include <aknview.h>

//<cmail>

#include "cfsmailcommon.h"

//</cmail>

// <cmail> Toolbar

#include "akntoolbarobserver.h"

// </cmail> Toolbar

// FORWARD DECLARATIONS

class CAlfControlGroup;

class CFreestyleEmailUiAppUi;

class CAlfVisual;

class CFsEmailUiViewBase: public CAknView, public MAknToolbarObserver

    {

public: // types

    enum TDynamicSwitchType

        {

        ESkinChanged,

        EScreenLayoutChanged,

        EOther

        };

public: // from CAknView

    // dummy implementation for the base class abstact functions are needed to be able to define a constructor

    TUid Id() const;

// <cmail> Toolbar

private:

    virtual void DoActivateL( const TVwsViewId& aPrevViewId,

        TUid aCustomMessageId,

        const TDesC8& aCustomMessage );

// </cmail> Toolbar

    /**

    * Inherited classes should NOT override this. The should override ChildDoDeactivate() instead.

    */

    void DoDeactivate();

public: // new functions

    /**

    * Returns a handle to the control group assosiated to this view, as given in the class constructor.

    */

    CAlfControlGroup& ControlGroup();

    /**

     * Handles application foreground events. When applcation is brought to

     * foreground, calls the virtual HandleForegroundEventL() method, which

     * can be implemented by subclasses.

     */

    virtual void HandleAppForegroundEventL( TBool aForeground );

    /**

    * Inherited classes should override this to react to skin or layout changes

    * happening while the view is active.

    */

    virtual void HandleDynamicVariantSwitchL( TDynamicSwitchType aType );

    /**

    * Inherited classes should override this to react to skin or layout changes

    * which happen when the view is not active.

    */

    virtual void HandleDynamicVariantSwitchOnBackgroundL( TDynamicSwitchType aType );

    /**

    * Mail list type views should override these to enable next/previous message

    * functionality in the mail viewer which has been launched from this list view.

    */

    virtual TBool IsNextMsgAvailable( TFSMailMsgId aCurrentMsgId, TFSMailMsgId& aFoundNextMsgId, TFSMailMsgId& aFoundNextMsgFolder ) const;

    virtual TBool IsPreviousMsgAvailable( TFSMailMsgId aCurrentMsgId, TFSMailMsgId& aFoundPreviousMsgId, TFSMailMsgId& aFoundPrevMsgFolder ) const;

    virtual TInt MoveToNextMsgL( TFSMailMsgId aCurrentMsgId, TFSMailMsgId& aFoundNextMsgId );

    virtual TInt MoveToPreviousMsgL( TFSMailMsgId aCurrentMsgId, TFSMailMsgId& aFoundPreviousMsgId );

    virtual TInt MoveToPreviousMsgAfterDeleteL( TFSMailMsgId aFoundPreviousMsgId );

    /**

     * Do the transition effect for the view if effects are enabled.

     */

    void DoTransition( TBool aDirectionOut );

    /**

     * Prepares application exit. This is called by AppUi during cleanup before AppUi's destructor

     */

	virtual void PrepareExitL();

	/**

	 * Called when flip state changes.

	 */

	virtual void FlipStateChangedL( TBool aKeyboardFlipOpen );

	/**

	* This method is called from the appui when the focus state is changed.

	* Each inherited view should implement own method for focus handling

	* @param aVisible Indicates if focus should become visible or removed

	*/

	virtual void FocusVisibilityChange( TBool aVisible );

protected: // methods

    /**

     * Inherited classes may override this to react to FsEmail application

     * being brougt to foreground while that particular view is active.

     */

    virtual void HandleForegroundEventL( TBool aForeground );

    /**

    * Inherited classes should override this instead of DoDeactivate()

    * to do the view deactivation

    */

    virtual void ChildDoDeactivate() = 0;

    /**

     * Make control group of the view visible and set to accept input.

     */

    virtual void ActivateControlGroup( TInt aDelay = 0 );

    /**

     * Make control group of the view invisible and set to ignore input.

     */

    virtual void DeactivateControlGroup( TInt aDelay = 0 );

    /**

    * Inheriting Alfred views can override these functions, if they need to do

    * some special tricks for transition effects

    */

    virtual void DoTransitionEffect( TBool aDirectionOut );

    /**

    * Inheriting Alfred views should override this and return their parent

    * layout(s) in array given as parameter. Default implementation

    * does nothing, so then the array is empty.

    */

    virtual void GetParentLayoutsL( RPointerArray<CAlfVisual>& aLayoutArray ) const;

    /**

     * Utility function to fade in/out given visual

     */

    void FadeVisual( CAlfVisual* aVisual,

                     TBool aFadeDirectionOut,

                     TBool aImmediate = EFalse );

    /**

    * Used to indicate that the next out transition effect should be long

    * (some long opening view is to be opened next)

    */

    void SetNextTransitionOutLong( TBool aLongTransitionOut );

    TBool IsNextTransitionOutLong();

    /**

     * Derived classes should call this always when the view is entered with forward navigation.

     * This is required to make returning from the view work correctly in case of external activation.

     * It doesn't hurt to call this also from views which cannot be externally activated.

     */

    void ViewEntered( const TVwsViewId& aPrevViewId );

    /**

     * Derived classes should call this to do backwards navigation e.g. when user

     * presses "Back" button. This returns to the previous view, and in case the view

     * was activated externally, takes FsEmail to background and brings the previous

     * application to foreground.

     */

    virtual void NavigateBackL();

    /**

     * Derived classes can call this utility function to set the middle soft key

     * label and ID from the given resource.

     */

    void ChangeMskCommandL( TInt aLabelResourceId );

// <cmail> Toolbar

protected: // toobar changes

    /**

     * @see CAknView::DoActivateL

     */

    virtual void ChildDoActivateL(

            const TVwsViewId& aPrevViewId,

            TUid aCustomMessageId,

            const TDesC8& aCustomMessage ) = 0;

    /**

     * Return view's toolbar resource id.

     */

    virtual TInt ToolbarResourceId() const;

    /**

     * Called when whole toolbar needs to be updated. Creates and sets new

     * toolbar by calling ToolbarResourceId() method.

     */

    void UpdateToolbarL();

    /**

     * Get array of item IDs that need to be dimmed before toolbar is set for

     * view.

     * @param aResourceId Resource ID of the toolbar.

     * @param aDimmedItems Array of items that will be dimmed.

     */

    virtual void GetInitiallyDimmedItemsL( const TInt aResourceId,

            RArray<TInt>& aDimmedItems ) const;

    /**

     * Replaces single toolbar item with item from resource file. Control

     * must be of AVKON_BUTTON type.

     * @param aReaplceId Id of command to be replaced.

     * @param aResourceId Resource Id of the control that will replace existing

     * item.

     * @param aIndex Index in array for new item. Default value is zero.

     */

    void ReplaceToolbarItemL( const TInt aReplaceId, const TInt aResourceId,

            const TInt aIndex = 0 );

    /**

     * Removes single toolbar item from toolbar.

     */

    void RemoveToolbarItem( const TInt aRemoveId );

    /**

     * Hides toolbar.

     */

    void HideToolbar();

    /**

     * Show toolbar.

     */

    void ShowToolbar();

    /**

     * Dim/undim toolbar item.

     */

    void SetToolbarItemDimmed( const TInt aCommandId, const TBool aDimmed );

    /**

     * Returns ETrue if view has toolbar.

     */

    virtual TBool HasToolbar() const;

protected: // Single click changes

    /**

     * Return current state of the focus visibility

     * @return ETrue if the focus should be shown

     */

    virtual TBool IsFocusShown();

	/**

	 * Set status bar layout. By default layout is R_AVKON_STATUS_PANE_LAYOUT_USUAL.

	 * Inherited classes can override this and set desired status bar layout.

	 */

	virtual void SetStatusBarLayout();

protected: // from MAknToolbarObserver

    /**

     * @see MAknToolbarObserver::OfferToolbarEventL

     */

    void OfferToolbarEventL( TInt aCommand );

// </cmail> Toolbar

protected: // construction

    CFsEmailUiViewBase( CAlfControlGroup& aControlGroup, CFreestyleEmailUiAppUi& aAppUi );

    /**

     * Return view active status. ETrue if the view is currently activated, EFalse otherwise.

     */

    TBool IsViewActive() const;

private:

    /**

     * Sets view's active status. Private to protect calling from inherited classes.

     */

    void SetViewActive( const TBool aActive );

protected: // data

    CAlfControlGroup& iControlGroup;

    CFreestyleEmailUiAppUi& iAppUi;

    // Status of the keyboard flip

    TBool iKeyboardFlipOpen;

    // Is focus visible

    TBool iFocusVisible;

private: // data

    TUid iPreviousAppUid;

    // ID of the mailbox which was active before this view was activated from an external application

    TFSMailMsgId iActiveMailboxBeforeExternalActivation;

    // Flag to indicate if next fade out effect should be longer than normally

    TBool iIsNextTransitionEffectOutLong;

    // Flag to indicate that Email app should be sent to background when the current view is deactivated

    TBool iSendToBackgroundOnDeactivation;

    // View's active status

    TBool iViewActive;

protected: // to enable overridning 

    TBool iWasActiveControlGroup;

    };

#endif // __FREESTYLEEMAILUI_VIEWBASE_H__