/*

* Copyright (c) 2002 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "Symbian Foundation License v1.0" to Symbian Foundation members and "Symbian Foundation End User License Agreement v1.0" to non-members

* which accompanies this distribution, and is available

* at the URL "http://www.symbianfoundation.org/legal/licencesv10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description: 

*

*/

// AknView.h

//

// Copyright (c) 1997-2001 Symbian Ltd.  All rights reserved.

//

#ifndef AKNVIEW_H

#define AKNVIEW_H

//  INCLUDES

#include <babitflags.h>

#include <coecntrl.h>

#include <eikmobs.h>

#include <coeaui.h>

#include <coeview.h>

#include <eikdef.h>

#include <coemop.h>

// FORWARD DECLARATIONS

class CAknViewAppUi;

class CEikStatusPane;

class CEikButtonGroupContainer;

class CAknControlStack;

class CAknViewExtension;

class CAknToolbar;

// CLASS DECLARATION

/**

 * This is an abstract base class for a Series 60 application view.

 *

 * @since Series 60 0.9

 */

class CAknView : public CBase, public MCoeView, public MEikMenuObserver, 

                public MObjectProvider

	{

public:

    /** 

     * Standard constructor.

     */

	IMPORT_C CAknView();

    /** 

     * Standard destructor.

     */	

	IMPORT_C ~CAknView();

    /** 

     * This is a second stage constructor initializing this view with standard 

     * values. Should be called from derived classes second stage construction

     * functions.  

     * @param aResId The numeric ID of the resource (@c iViewInfo) to be read. 

     *        If aResId=0, resource file is not accessed.

     */

	IMPORT_C void BaseConstructL(TInt aResId=0);

    /** 

     * Constructs invisible button group container and menu if they don't exist

     * yet. They are placed on the view stack. To be used by views which need 

     * to access the menu or cba before the view is activated for the first 

     * time.

     */	

	IMPORT_C void ConstructMenuAndCbaEarlyL();		

    /** 

     * Activate any view in the product. Calls @c CCoeAppUi::ActivateViewL(

     * aViewId)

     * @param aViewId Identifies the view to activate.

     */

	IMPORT_C void ActivateViewL(const TVwsViewId& aViewId);

    /** 

     * Activate any view, then passes the message text @c aCustomMessage of 

     * type @c aCustomMessageId. Calls @c CCoeAppUi::ActivateViewL(

     * aViewId,aCustomMessageId,aCustomMessage) 

     * @param aViewId Identifies the view to activate.

     * @param aCustomMessageId Specifies the message type.

     * @param aCustomMessage The message passed to the activated view.

     */

	IMPORT_C void ActivateViewL(const TVwsViewId& aViewId,

	                            TUid aCustomMessageId,

	                            const TDesC8& aCustomMessage);

    /**

    * Returns views id, intended for overriding by sub classes.

    * @return id for this view.

    */

	IMPORT_C virtual TUid Id() const =0;

    /** 

     * Event handler for status pane size changes.

     * @c CAknView provides an empty implementation for sub classes that do 

     * not want to handle this event.

     */

	IMPORT_C virtual void HandleStatusPaneSizeChange();

    /** 

     * From @c MCoeView. The full view Id for this view. Calls @c Id()

     * @return View identification number.

     */

	IMPORT_C TVwsViewId ViewId() const;

	/** 

     * From @c MEikMenuObserver. This function processes user commands by 

     * handling @c aCommand values @c EAknSoftkeyOptions, @c EAknCmdExit, 

     * @c EEikCmdCanceled and passing the others to @c HandleCommandL() 

     * for sub class to decide the actions.  

     * @param aCommand ID of the command to respond to. 

     */	 

	IMPORT_C virtual void ProcessCommandL(TInt aCommand);

    /** 

     * Command handling function intended for overriding by sub classes. 

     * Default implementation is empty.  

     * @param aCommand ID of the command to respond to. 

     */

	IMPORT_C virtual void HandleCommandL(TInt aCommand);

    /** 

     * Menu bar accessor method. This returns the views menu if available, 

     * otherwise it returns the applications menu bar.

     * @return  @c CEikMenuBar pointer to views menu bar.

     */

	IMPORT_C virtual CEikMenuBar* MenuBar() const;

	/** 

     * Calculates the client rectangle of the view, taking the applications 

     * client rectangle and the views CBA into account.

     * Calls @c CEikAppUi::ClientRect() 

     * @return @c TRect the area of the screen available to the application 

     *          for drawing.

     */

	IMPORT_C TRect ClientRect() const;

    /** 

     * This function causes the menu bar to disappear from the screen until it

     * is invoked again by the user.

     * Calls @c CEikAppUi::StopDisplayingMenuBar().

     */

	IMPORT_C void StopDisplayingMenuBar();

    /** 

     * Determines whether the application is foreground. 

     * @return @c ETrue if view is foreground.

     */

	IMPORT_C TBool IsForeground() const;

    /**

    * Called by the framework when view's rectangle changes. The default

    * implementation is empty. This function is not used yet.

    * @since Series 60 3.0

    */

    IMPORT_C virtual void HandleViewRectChange();

    /**

    * Asks the view to redraw its area. Needs to be implemented only by

    * views used in split view architecture. The default implementation is

    * empty. This function is not used yet.

    * @since Series 60 3.0

    */

    IMPORT_C virtual void Redraw() const;

    /** 

     * Avkon view architecture system. Internal use only.

     * Calls @c DoActivateL.

     */	 

	IMPORT_C virtual void AknViewActivatedL(const TVwsViewId& aPrevViewId,

	                                        TUid aCustomMessageId,

	                                        const TDesC8& aCustomMessage);

    /** 

     * Avkon view architecture system. Internal use only. Function is called 

     * by @c CAknViewAppUi::~CAknViewAppUi() for immediate view deactivation. 

     * Calls @c DoDeactivate.     

     */  

	void AknViewDeactivated();

    /** 

     * Avkon view architecture system. Internal use only.

     */ 

	void ProcessForegroundEventL(TBool aForeground);

private: // formerly from @c MTopSetMember<CEikMenuBar>

	IMPORT_C virtual void Reserved_MtsmPosition();

	IMPORT_C virtual void Reserved_MtsmObject();

protected:

    /** 

     * Accessor for the applications user interface as a @c CAknViewAppUi.

     * @return Pointer to user interface instance.

     */

	IMPORT_C CAknViewAppUi* AppUi() const;

    /** 

     * Status pane accessor method.

     * @return Pointer to status pane. 

     */

	IMPORT_C CEikStatusPane* StatusPane() const;

    /** 

     * Button group container (=CBA) accessor method. 

     * This returns the views CBA if there is one, and the applications user 

     * interfaces CBA otherwise.

     * @return Pointer to @c CEikButtonGroupContainer.

     */

	IMPORT_C CEikButtonGroupContainer* Cba() const;

    /** 

     * Handles a view activation and passes the message of type 

     * @c aCustomMessageId. This function is intended for overriding by 

     * sub classes. This function is called by @c AknViewActivatedL().

     * Views should not launch waiting or modal notes or dialogs in

     * @c DoActivateL.

     * @param aPrevViewId Specifies the view previously active.

     * @param aCustomMessageId Specifies the message type.

     * @param aCustomMessage The activation message.

     */

	IMPORT_C virtual void DoActivateL(const TVwsViewId& aPrevViewId,

	                                  TUid aCustomMessageId,

	                                  const TDesC8& aCustomMessage) = 0;

    /** 

     * View deactivation function intended for overriding by sub classes. 

     * This function is called by @c AknViewDeactivated().

     */

	virtual void DoDeactivate() = 0;

protected: // From MCoeView.

    /** 

     * From @c MCoeView. Takes any action required when this view is activated.

     * Handles this view activation event from view server. Calls 

     * @c CAknViewAppUi::ViewActivatedL()

     * @param aPrevViewId Specifies the view previously active.

     * @param aCustomMessageId Specifies the message type.

     * @param aCustomMessage Activation message.

     */

	IMPORT_C void ViewActivatedL(const TVwsViewId& aPrevViewId,

	                             TUid aCustomMessageId,

	                             const TDesC8& aCustomMessage);

    /** 

     * From @c MCoeView. Takes any action that is required following 

     * deactivation of this view. Handles this view deactivation event from

     * viewserver. Calls @c CAknViewAppUi::ViewDeactivated()

     */

	IMPORT_C void ViewDeactivated();

    /** 

     * From @c MCoeView. Screen device changed function from viewserver.

     * @return TVwsViewIdAndMessage created with default values.

     */

	IMPORT_C TVwsViewIdAndMessage ViewScreenDeviceChangedL();

protected: // from MObjectProvider

    /** 

     * From @c MObjectProvider. Gets an (@c MAknsControlContext) object whose 

     * type is encapsulated by the specified TTypeUid object. Calls 

     * @c SupplyMopObject( @c TTypeUid aId, 

     *      @c CEikButtonGroupContainer* iCba, @c CEikMenuBar* iMenu ). 

     * @param aId Encapsulates the @c Uid that identifies the type of object 

     *         required. 

     * @return Pointer to the @c MAknsControlContext object provided. Note that

     *          the pointer may be @c NULL. 

     */

	IMPORT_C TTypeUid::Ptr MopSupplyObject(TTypeUid aId);

    /** 

     * From @c MObjectProvider. Gets the parent object provider.   

     * @return Pointer to the parent object provider (@c MObjectProvider) that

     *          is @c CAknViewAppUi* iAppUi, or @c NULL.

     */

	IMPORT_C MObjectProvider* MopNext();

protected: // From MEikMenuObserver.

    /** 

     * From @c MEikMenuObserver. Menu emphasising or de-emphasising function. 

     * @c CEikMenuBar objects call this on their observer. Updates the value of

     * the flags for the (@c aMenuControl) on the control stack. 

     * @param aMenuControl The control to be emphasised or de-emphasisied.

     * @param aEmphasis @c ETrue to emphasize the menu, @c EFalse to refuse the

     *          focus.

     */

	IMPORT_C virtual void SetEmphasis(CCoeControl* aMenuControl,

	                                  TBool aEmphasis);

    /** 

     * From @c MEikMenuObserver. Foreground event handling function intended 

     * for overriding by sub classes.  

     * @param aForeground Indicates the required focus state of the control.

     */	

	IMPORT_C virtual void HandleForegroundEventL(TBool aForeground);

private: // internal functions

	void ConstructMenuAndCbaL(TBool aVisible);

	/**

	* Asserts that extension class object exists.

	* @return Extension object.

	*/

	CAknViewExtension* Extension() const;

public: // new functions

    /**

	* @since Series 60 3.1

	* @return toolbar object.

	*/

	IMPORT_C CAknToolbar* Toolbar() const;

	/** 

     * This function causes toolbar to be hidden

     * @since Series 60 3.1

     */

	IMPORT_C void StopDisplayingToolbar();

    /** 

     * Determines if the toolbar of this view is shown when the view is 

     * activated. 

     * @since S60 3.2

     * @return ETrue if toolbar is shown. 

     */

    IMPORT_C TBool ToolbarShownOnViewActivation() const; 

    /** 

     * Sets toolbar visibility status of this view according to value given. 

     * The value is used when view is activated. 

     * @since S60 3.2

     * @param aVisible to determine if toolbar should be shown. 

     */

    IMPORT_C void ShowToolbarOnViewActivation( TBool aVisible ); 

    /** 

     * Saves toolbar status of this view according to values given. 

     * The values are used when view is activated. 

     * @since S60 3.2

     * @param aVisible to determine if toolbar should be shown. 

     * @param aFocused ETrue if toolbar is focused, EFalse if not

     */

    void SaveToolbarStatus( TBool aVisible, TBool aFocused ); 

    /** 

     * Sets new toolbar for the view. Deletes old toolbar. If the old toolbar 

     * was shown before deleting, then the new toolbar will also be shown.

     * @since S60 5.0

     * @param aToolbar pointer to new toolbar

     */

    IMPORT_C void SetToolbar( CAknToolbar* aToolbar ); 

    /** 

     * Creates a new toolbar object with the resource id given and sets it for

     * the view. Deletes old toolbar. If the old toolbar was shown before

     * deleting, then the new toolbar will also be shown.  

     * @since S60 5.0

     * @param aResourceId Resource id of the new toolbar

     */

    IMPORT_C void CreateAndSetToolbarL( TInt aResourceId ); 

protected:  // Data

	// The follow object is not owned by this class. iCoeEnv is protected in 

	// keeping with @c CCoeAppUi & @c CCoeControl

	CCoeEnv* iCoeEnv;

private:

	CAknViewAppUi* iAppUi;

	// @c SAknViewInfo is the C++ image of resource structure AVKON_VIEW

	struct SAknViewInfo

		{

	public:

        TUint8 iVersion;    // resource struct version

		TInt iHotKeys;		// resource id

		TInt iMenu;			// resource id

		TInt iCba;			// resource id

        TInt iToolbar;      // resource id

        TInt iExtension;    // resource id

		};

	// The following member data are owned by this class

	SAknViewInfo iViewInfo;

	CEikMenuBar* iMenu;

	CEikButtonGroupContainer* iCba;

	TBitFlags iFlags;

    CAknViewExtension* iExtension;

	};

#endif      // AKNVIEW_H