/*

* 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:  Taskswitcher Fast Swap area UI

 *

*/

#ifndef TSFASTSWAPAREA_H

#define TSFASTSWAPAREA_H

#include <e32base.h>

#include <eikmobs.h>

#include "tsdevicestate.h"

#include "tsfswclientobserver.h"

#include "tsfastswapgrid.h"

#include "tseventcontrolerobserver.h"

// FORWARD DECLARATIONS

class CTsFswClient;

class CTsFswEntry;

class CAknStylusPopUpMenu;

class CAknQueryDialog;

class CTsEventControler;

class MTsDataChangeObserver;

/**

 * Taskswitcher Fast Swap area UI.

 */

class CTsFastSwapArea: public CCoeControl,

                               public MEikMenuObserver,

                               public MTsFswObserver,

                               public MEikListBoxObserver,

                               public MTsFastSwapGridObserver,

                               private MTsEventControlerObserver,

                               public MTsDeviceStateObserver,

                               public MTsFastSwapTimerObserver

    {

public:

    /**

     * Two-phase constructor.

     * 

     * @param aRect Area where fast swap info & list should draw itself.

     * @param aParent Parent CoeControl. 

     */

    static CTsFastSwapArea* NewL( const TRect& aRect,

            CCoeControl& aParent, CTsDeviceState& aDeviceState,

            CTsEventControler& aEventHandler);

    /**

     * @copydoc NewL

     */

    static CTsFastSwapArea* NewLC( const TRect& aRect,

            CCoeControl& aParent, CTsDeviceState& aDeviceState,

            CTsEventControler& aEventHandler);

    /**

     * Destructor.

     */

    ~CTsFastSwapArea();

    /**

     * Called from appview when coming to foreground.

     */

    void HandleSwitchToForegroundEvent();

    /**

     * Called from appview when going to background.

     */

    void HandleSwitchToBackgroundEvent();

    /**

     * Called after construction to set up additional properties,

     * like the control observer.

     */

    void Setup( MCoeControlObserver& aControlObserver );

    /**

     * Saves the index of the currently selected (highlighted) item.

     */

    void SaveSelectedIndex();

    /**

     * Restores the selection (highlight) position.

     */

    void RestoreSelectedIndex();

    // Functions to perform activate, close, close others operations.

    // They are public so same functionality can be implemented in the

    // Options menu (appui) for example.

    /**

     * Index of highlighted item or KErrNotFound.

     */

    TInt SelectedIndex() const;

    /**

     * Brings the app corresponding to the item at given index into foreground.

     */

    void SwitchToApp( TInt aIndex );

    /**

     * Sends close msg to given app.

     * @param   aIndex      index

     * @param   aSuppressRendering  content is not refreshed if ETrue

     */

    void TryCloseAppL( TInt aIndex, TBool aSuppressRendering = EFalse );

    /**

     * Tries to Close all applications that cn be closed

     */

    void TryCloseAllL();

    /**

     * True if it is allowed to ask the given app to close.

     * @param   aIndex  index

     */

    TBool CanClose( TInt aIndex ) const;

    /**

     * @param  aSelectedItem  item for which pop up is shown

     * 

     * @return ETrue, when number of closable apps is >= 2 or there is at least

     *                one closable item and non closable item is selected.

     * @return EFalse, when number of closable apps is < 2.

     */

    TBool CanCloseAll( TInt aSelectedItem ) const;

    /**

     * Returns the number of items in the list.

     */

    TInt Count() const;

    /**

     * Returns the underlying Ganes control pointer.

     */

    CCoeControl* GetChildControl() { return iGrid; }

    /**

     * Sets the data-changed observer.

     */

    void SetDataChangeObserver( MTsDataChangeObserver* aDcObserver );

    /*

     * Handling short/long app key.

     */

    void HandleAppKey(TInt aType);

    /*

     * Updates components visibility, used to switch off

     * grid scrollbar visibility for transition effects

     */

    void UpdateComponentVisibility();

private:

    /**

     * @copydoc NewL

     */

    void ConstructL( const TRect& aRect );

    /**

     * C++ constructor.

     */

    CTsFastSwapArea(CCoeControl& aParent,

            CTsDeviceState& aDeviceState,

            CTsEventControler& aEventHandler);

    // From MEikListBoxObserver

    void HandleListBoxEventL(CEikListBox* aListBox, TListBoxEvent aEventType);

public:

    /**

     * Implements drag gesture handling

     * @see MTsEventControlerObserver

     */

    void MoveOffset(const TPoint&, TBool);

    /**

     * Implements tap gesture handling

     * @see MTsEventControlerObserver

     */

    void TapL(const TPoint&);

    /**

     * Implements long tap gesture handling

     * @see MTsEventControlerObserver

     */

    void LongTapL(const TPoint&);

    /**

     * Implements drag gesture handling

     * @see MTsEventControlerObserver

     */

    void DragL(const AknTouchGestureFw::MAknTouchGestureFwDragEvent& aEvent);

    /**

     * Implements animation stop handling

     * @see MTsEventControlerObserver

     */

    void Stop();

    /**

     * Implements view position getter. Returns point in the middle of the

     * grid view window.

     * 

     * @see MTsEventControlerObserver

     */

    TPoint ViewPos()const;

    /**

     * Checks if the app with the given window group id is closing

     */

    TBool IsAppClosing( TInt aWgId );

public:    

    // from CCoeControl    

    TInt CountComponentControls() const;

    CCoeControl* ComponentControl(TInt aIndex) const;

    void FocusChanged( TDrawNow aDrawNow );

    void SizeChanged();

    void Draw( const TRect& aRect ) const;

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

    void HandlePointerEventL( const TPointerEvent& aPointerEvent );

private:

    // From MTsFswObserver     

    void HandleFswContentChanged();

    // From MEikMenuObserver

    void ProcessCommandL( TInt aCommandId );

	void SetEmphasis( CCoeControl*, TBool ) { }

	// From MTsFastSwapGridObserver

	void HandleCloseEventL(TInt aItemIdx);

	// From MTsDeviceStateObserver

	void HandleDeviceStateChanged( TChangeType aChangeType );

    // From MTsFastSwapTimerObserver

    void TimerCompletedL( CTsFastSwapTimer* aSource );

// new functions    

    /**

     * Makes a copy of the given bitmap.

     * Also scaled to the given size, but maintains aspect ratio,

     * so the size of the returned bitmap may be less then aSize.

     */

    CFbsBitmap* CopyBitmapL( TInt aFbsHandle, TSize aSize );

    /**

     * Called from HandleFswContentChanged.

     */    

    void HandleFswContentChangedL();

    /**

     * Shows the content from iArray on the screen.

     */

    void RenderContentL( TBool aSuppressAnimation = EFalse );

    /**

     * Creates the ganes grid control.

     */

    void ReCreateGridL();

    /**

     * Setup grid layout

     */

    void LayoutGridL();

    /**

     * Returns rectangles for fast swap area controls

     */

    void GetFastSwapAreaRects( RArray<TAknLayoutRect>& aRects );

    /**

     * Creates a stylus popup instance (iPopup) if not yet done.

     */

    void PreCreatePopupL();

    /**

     * Shows the stylus popup menu if not yet visible.

     * @param   aIndex  index of item in the grid

     * @param   aPoint  position for the popup

     */

    TBool ShowPopupL( TInt aIndex, const TPoint& aPoint );

    /**

     * Sends the data-changed notification.

     */   

    void NotifyChange();

    /**

     * Retrieves and returns size for image graphics.

     */

    TSize PreferredImageSize();

    /**

     * Retrieves number of items in grid

     */

    TInt GridItemCount();

    /**

     * Calculates the correct size if aspect ratio needs to be preserved.

     */

    TSize CalculateSizePreserveRatio(const TSize& aTargetAreaSize,

            const TSize& aSourceSize);

    /**

     * Selects next item in grid

     */

    void SelectNextItem();

    /**

     * Centralise most centered item so it was most exposed on the view.

     * Centered element is being selected by grid.

     * Animation to the centered element is made after aRedrawDelay time.

     * 

     * @param aRedrawDelay - animation delay.

     */

    void CenterItem( TInt aRedrawDelay);

    /**

     * Returns full grid view size.

     */

    TSize GridWorldSize();

    /**

     * Updates grid, called for manual grid scroll update

     * 

     * @param  aForceRedraw    if set to ETrue - redraw will be forced

     * @param  aAnimate        set to ETrue to enable animation

     */

    void UpdateGrid( TBool aForceRedraw = EFalse,

                     TBool aAnimate = ETrue );

    /**

     * Returns grid view size

     */

    TSize ViewSize();

    /**

     * Returns the position of the given item inside grid world rect.

     * Returns point in the middle of the view rectangle.

     * 

     * @param  aItemIdx  index of the item for which calculation will be done

     */

    TPoint ItemViewPosition( TInt aItemIdx );

    /**

     * Returns index of the shown item, based on the logical

     * position of the grids view. Item that is closest to the

     * middle of screen is returned.

     * 

     * @param  aViewPos  grids view position. This must be point in

     *                   the middle of the view rectangle

     * @return  index of the item

     */

    TInt ViewToVisibleItem( const TPoint aViewPos );

    /**

     * Launches increasing pop-up feedback.

     */

    void LaunchPopupFeedback();

    /**

     * Show highlight when disabled and 

     * consume EEventKeyUp that follows after event that swiched on the highlight.

     */

    TKeyResponse ShowHighlightOnKeyEvent(const TKeyEvent& aKeyEvent, TEventCode aType);

    /**

     * Returns current screen orientation:

     * 

     * @return  1 if landscape, 0 if portait 

     */

    TInt GetCurrentScreenOrientation();

    /**

     * Retrieves variety value, based on current screen resolution.

     * 

     * @param  aVariety  result of the function, 0 value means portrait

     *                   value of 1 indicates landscape

     * @return  ETrue if screen resolution differs from vale returned by

     *          layout meta data functions.

     */

    TBool GetVariety( TInt& aVariety );

private: // Data

    // parent control

    CCoeControl& iParent;

    // device state

    // not own 

    CTsDeviceState& iDeviceState;

    // grid, own

    CTsFastSwapGrid* iGrid;

    // fsw client, own

    CTsFswClient* iFSClient;

    // fsw content, ptrs owned

    RPointerArray<CTsFswEntry> iArray;

    // index of selected (highlighted) item in the grid

    // when the fsw was last focused

    TInt iSavedSelectedIndex;

    // fsw popup (activate, close, etc.), own

    CAknStylusPopUpMenu* iPopup;

    // the aIndex argument of ShowPopupL is stored here

    TInt iAppIndexForPopup;

    // Observer ptr, may be NULL, not owned

    MTsDataChangeObserver* iDcObserver;

    //Input events handler

    CTsEventControler& iEvtHandler;

    TInt iMaxItemsOnScreen;

    // Tap event

    TPointerEvent iTapEvent;

    CTsFastSwapTimer* iHighlightTimer;

    // View offset position, used by animation physics

    TInt iLogicalViewPosOffset;

    // Grid scrolling

    TInt iGridItemWidth;

    TInt iGridItemGap;

    CTsFastSwapTimer* iRedrawTimer; // owned

    CTsFastSwapTimer* iUpdateGridTimer;//owned

    CTsFastSwapTimer* iOrientationSignalTimer; // owned

    TInt iPrevScreenOrientation;

    TBool iIgnoreLayoutSwitch;

    // Key event handling

    TBool iConsumeEvent;

    TBool iKeyEvent;

    // App closing handling

    RArray<TInt> iIsClosing;

    TInt iWidgetClosingCount;

    };

#endif // TSFASTSWAPAREA_H