/*

* Copyright (c) 2002-2009 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: 

*  Base class for setting page (setting item editing) UI

*

*/

#ifndef __AKNSETTINGPAGE_H__

#define __AKNSETTINGPAGE_H__ 

#include <AknControl.h>

#include <eikdef.h>

#include <eikbtgpc.h>

// For menu support

#include <eikmenub.h>

#include <eikmenup.h>

#include <eikmobs.h>

// for layout support

#include <AknUtils.h>

// for navipane support (hint text)

#include <aknnavi.h>

//

// Forward declarations

//

class CEikLabel;

class CAknSettingPageSkinsInfo;

class MAknsControlContext;

class CAknsFrameBackgroundControlContext;

class CAknSettingPageExtension;

// Used as the return value of SettingId() if not yet set.

// This because the Id might want to be the index of a 0-based array

const TInt KAknSettingPageNoIdSet = -1;

class CAknSettingPage;

// This class is used as a means of notifying change in settings.

class MAknSettingPageObserver 

{

public:

enum TAknSettingPageEvent

	{

	EEventSettingChanged,

	EEventSettingCancelled,

	EEventSettingOked

	};

public:

/**

 * Handles an event of type aEventType reported by the Setting Page to this observer.

 */

virtual void HandleSettingPageEventL(CAknSettingPage* aSettingPage,TAknSettingPageEvent aEventType )=0;

};

class CAknSettingPage : public CAknControl, public MCoeControlObserver, public MEikMenuObserver

{

public:

/**

* This enumeration is passed in the ExecuteLD() method to control how often the setting page 

* updates the externally held client object

*/

	enum TAknSettingPageUpdateMode

		{

		EUpdateWhenChanged,

		EUpdateWhenAccepted

		};

/**

* This enumeration is used to select the type and IIDs for the various classes defined in the 

* Skins LAF spec for "Opened Setting Items"

*/

	enum TEditedItemSkinClass

		{

		ESettingPageSkinEditedItemClassValueItemList,

		ESettingPageSkinEditedItemClassVolume,

		ESettingPageSkinEditedItemClassSlider,

		ESettingPageSkinEditedItemClassTextEntry,

		ESettingPageSkinEditedItemClassCodeDateTimeEntry

		};

/**

 * Simple contructor for using a single setting page resource which itself gives all 

 * the setup

 */

	IMPORT_C CAknSettingPage( TInt aSettingPageResourceId );

 /**

 * Constructor that allows separate setting page and editor resources

 *

 * In all cases the number (if supplied i.e. <> 0 ) is used.  

 *

 *		Editor Resource 	Setting Page Resource

 *			present 			present 			Both are used (but text & number overridden)

 *			 = 0				present 			Editor resource is used via SP resource

 *			present 			= 0 				Default Avkon SP resource if used

 *			 = 0				= 0 				Not permitted

 *

 * Note: The first argument is a TDesC* (rather than TDesC&) because the other constructor

 * cannot initialize such a member without allocation or having an internal dummy buffer.

 *

 * Rules for text and numbers: The rules are the same for both:  (non-zero length) text or number other 

 * than EAknSettingPageNoOrdinalDisplayed if given in this constructor will not override resource 

 * (unless that is zero length or EAknSettingPageNoOrdinalDisplayed).  Note, however, that text or number given via the 

 * specific API for setting them, WILL override resource.

 * It is assumed that number from resource is very rare.  Special text is somewhat more likely.

 * 

 * @param aSettingTitleText		Text at top of setting pane (not copied; must be owned externally until ExecuteLD is called)

 * @param aSettingNumber		Number at top left (if present)

 * @param aControlType			Determines the type constructed and how its resource is read

 * @param aEditorResourceId Editor resource to use in the setting page (if present)

 * @param aSettingPageResourceId		Setting Page to use (if present)

 */

	IMPORT_C CAknSettingPage(	const TDesC* aSettingTitleText, 

								TInt aSettingNumber, 

								TInt aControlType,

								TInt aEditorResourceId, 

								TInt aSettingPageResourceId = 0 );

/**

* C++ destructor

*/

	IMPORT_C virtual ~CAknSettingPage();

/**

 * Executes a waiting dialog-like setting page

 * 

 * The passed mode determines if the editor's value is updated continuously, or just

 * when it is accepted.

 * 

 * @param	aMode		The update mode of the class

 */

	IMPORT_C TBool ExecuteLD( enum CAknSettingPage::TAknSettingPageUpdateMode aMode=EUpdateWhenAccepted );

/**

 * public method for construction.	Only thing required to do in this class is to call the 

 * BaseConstructL(). Derived classes may be required to do more

 *

 */

	IMPORT_C virtual void ConstructL();

/**

 * Returns reference to the hosted "editor" control as a CCoeControl.

 * This routine is used in derived classes, which may then cast to the specific run-time type

 * Note also that derived classes may provide type-specific access that performs these casts already

 * 

 * @return CCoeControl* pointer to the hosted editor control

 */

	IMPORT_C CCoeControl* EditorControl() const;

/**

 * Returns the setting Id.

 *

 * @return TInt the setting Id

 */

	IMPORT_C TInt SettingId() const;

/**

 * Sets the setting Id.  The Id may be used to unabiguously number a setting in some context.

 * It would be useful to call SettingId() on aSettingPageControl in handling an observer

 * callback.  The Id is not used internally.

 *

 * @param	aSettingId		An id to provide to the observer in the callback 

 */

	IMPORT_C void SetSettingId( TInt aSettingId );

/**

* Substitutes the new setting number. 

*

* @param	aSettingNumber	The new setting number to display

*/

	IMPORT_C void SetSettingNumberL( const TInt aSettingNumber );

/**

 * Substitutes the new setting text.  Memory is allocated for a copy.

 * If already constructed, the label is reformatted.  

 * 

 * Note that calling this will over-ride text in Setting Page resource

 * 

 * @param	aSettingText	The new setting text to display

 */

	IMPORT_C void SetSettingTextL( const TDesC& aSettingText );

/**

 * Sets the observer for the setting page.

 *

 * @param	aObserver	The observer for changes to the setting

 */

	IMPORT_C void SetSettingPageObserver( MAknSettingPageObserver* aObserver);

/**

 * Access method for the number of the setting page

 *

 */

	IMPORT_C TInt SettingNumber() const;

/**

 * Access method for whether the setting page is numbered or not

 *

 */

	IMPORT_C TBool IsNumbered() const;

/**

 * Set method for whether the setting page is numbered or not

 *

 */

	IMPORT_C void SetNumbered( TBool aNumbered );

/**

 * Reads the passed-in setting page resource in order to read the contained editor control

 * resource information

 * @param aSettingPageResoruceId	This is used to specifiy what resource to read

 * @param aControlType				Returns the control type (MAY return 0 - that's a valid control type!

 * @param aEditorResourceId 		Returns the setting page's LLINK editor resource, but returns 0 if not present

 * 

 * This will leave if an invalid resource ID is passed

 */

	IMPORT_C static void GetEditorResourceInfoL( 

		TInt aSettingPageResourceId, 

		TInt& aControlType, 

		TInt& aEditorResourceId );

 /**

 * Set the edit-state of the setting page. The setting page can be edited or 

 * it can be only viewed by the user.

 *

 * @since 3.1

 * @param   aEditable If false, the setting page cannot be modified by the user

 */

 IMPORT_C void SetEditState(const TBool aEditable);

 /**

 * Is the setting page possible to edit by the user.

 *

 * @since 3.1

 * @return  Can user modify the setting page. True if can, false if cannot.

 */

 IMPORT_C TBool IsEditable() const;

 /**

 * Used for aknsettingpage's extenstion corresponding function

 *

 * @since 5.0

 * @param  aCaption On return, this should be set to the caption of the target control. 

 */ 

 void GetCaptionForFep(TDes& aCaption) const;

 /**

 * Calculates and returns setting item content rect.

 *

 * @param  aScrollBarUsed  @c ETrue if the setting page content should have

 *                         scrollbar, @c EFalse otherwise.

 *

 * @internal

 * @since 5.2

 * @return Setting item content rectangle. 

 */

 TRect SettingItemContentRect( TBool aScrollBarUsed );

 /**

 * Is the setting page drawing the background itself or not (= "transparency")

 */ 

 TBool IsBackgroundDrawingEnabled() const;

/**

* Access method to the Command button array

*

* Must be called after full construction, or null reference will be returned.

*

* @return CEikButtonGroupContainer* a pointer to the cba owned by the setting page

*/

    IMPORT_C CEikButtonGroupContainer* Cba() const ;

protected:

/**

* From CCoeControl

* This routine is called as part of the set-up of the control.	It is the place to put

* layout code. 

*

*/

	IMPORT_C virtual void SizeChanged();

/**

* From CCoeControl

* Takes any action required when the control gains or loses focus e.g. to change its appearance.

* The control should be redrawn depending on the value of aDrawNow. Empty by default.

*/

	IMPORT_C virtual void FocusChanged(TDrawNow aDrawNow); 

/**

 * From MEikCommandObserver

 * Processes events from the softkeys. Responds to EAknSoftkeyOk and EAknSoftkeyBack

 * to accept or cancel the pop-up.

 *

 * @param	aCommandId	Event Id from the soft-key

 */

	IMPORT_C virtual void ProcessCommandL(TInt aCommandId);

/**

 * From MCoeControlObserver:

 * Acts upon changes in the hosted control's state. 

 * 

 * This class's implementation is trivial and should be able to be

 * safely re-implemented in directly client-derived classes. 

 * For non-base setting page classes, a call to the base class should be made

 *

 * @param	aControl	The control changing its state (not used)

 * @param	aEventType	The type of control event 

 */

	IMPORT_C virtual void HandleControlEventL(CCoeControl* aControl,TCoeEvent aEventType);

//

//

// Framework functions. New in this class

//

//

	/**

	* Framework method to determine if it is OK to exit the setting page.

	* Derived classes may check for valid data before allowing the dismissal of the 

	* setting page.

	*

	* @param	aAccept ETrue if the user has indicated to accept the setting page; EFalse otherwise

	* @return	TBool	a value indicating whether the setting page should be dismissed

	*/

	IMPORT_C virtual TBool OkToExitL(TBool aAccept);

/**

* Called immediately prior to activation of the dialog.  Framework routine for derived

* classes.

*

*/

	IMPORT_C virtual void DynamicInitL();

/**

 * Called when something has changed and the client's object needs to have its value updated

 *

 */

	IMPORT_C virtual void UpdateSettingL();

/**

 * Called when the user accepts a setting and the setting page is about to be dismissed.  The latest value of the

 * setting is written to the client's object

 */

	IMPORT_C virtual void AcceptSettingL();

/**

 * Called when the user rejects the setting.  A backup copy may need to be restored if UpdateWhenChanged flag was set

 *

 */

	IMPORT_C virtual void RestoreOriginalSettingL();

/** 

 * Display the menu

 */

	IMPORT_C virtual void DisplayMenuL() ;

/**

 * Hide the menu

 */

	IMPORT_C virtual void HideMenu() ;

/** 

 * Puts the focus back on the editor. For complicated setting pages that have focus removed from them

 * at some point, then a re-implementation may have to do some work here.

 */

	IMPORT_C virtual void SetFocusToEditor();

/**

 * This method should be implemented in listbox classes to move the selection in 

 * listbox editors prior to exiting from the setting page. It is called on a 

 * CAknSettingPage* reference, and is therefore declared here.

 */

	IMPORT_C virtual void SelectCurrentItemL();

/**

 * Protected non-virtual base method for construction.	Only thing required to do in this class is 

 * call the ConstructFromResourceL routine and set the flag that says construction has occured

 *

 */

	IMPORT_C void BaseConstructL();

/**

 * Called to remove the setting page. Should not be called except from within re-implemented

 * AttemptExitL

 *

 * @param	aAccept ETrue to accept the current value; EFalse otherwise

 */

	IMPORT_C void DismissL( TBool aAccept );  

/**

 * This is used as a protected access function for the state of the menu bar

 *

 * @return TBool	ETrue if the menu is currently showing 

 */

	IMPORT_C TBool MenuShowing() const ;

/** 

* This constructs the control based upon the id passed

*

*/

	IMPORT_C void ConstructFromResourceL( TInt aResourceId);

/** 

* This constructs the control based upon a constructed and positioned reader

*

*/

	IMPORT_C void ConstructFromResourceL(TResourceReader& aRes);

 /**

 * Called when the user accepts or cancels the setting. Default implementation

 * sets the return value and exists. 

 * 

 * Re-implementations must call DismissL and StopActiveScheduler() if the setting is

 * to leave.

 *

 * @param	aAccept ETrue if the user accepted. EFalse if the user cancelled.

 */

	IMPORT_C void AttemptExitL(TBool aAccept);

/**

* Method to determine the current running state of the setting page's 

* ActiveScheduler level. 

*

* @return	EFalse only if the CActiveSheduler level is not running

*/

	IMPORT_C TBool Waiting(); 

/**

 * This is used to access the default resource id for the cba - the one used when 

 * data is valid.

 *

 * @return TInt 	the default resource Id 

 */

	IMPORT_C TInt DefaultCbaResourceId() const; 

/** 

* This routine routes the keys to the editor. 

* However, if the menu is showing, then events are sent to the menu. 

*

* @param	aKeyEvent	event information	

* @param	aType		type of event being handled

*

*/

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

/**

* This routine is the base layout for CAknSettingPage. It lays out the labels and configures

* the drawing in general.

*/	

	IMPORT_C void StandardSettingPageLayout();

/**

 * This method can be used to test if BaseConstructL() has been called yet

 * successfully

 *

 * @return TBool	ETrue if BaseContructL has been called (and not left)

 */

	IMPORT_C TBool IsBaseConstructed();

/**

 * Access method for the internally held resource Id

 *

 */

	IMPORT_C TInt SettingPageResourceId();

/** 

* Perform the drawing of coded within CAknSettingPage

* 

*/

	IMPORT_C void BaseDraw(const TRect& aRect) const;

/**

* Set default construction values of internal state

*/

	IMPORT_C void ResetFlags();

/**

 * Framework method called as soon as the setting page is displayed, but before the new active sheduler level

 * is started.	Returning EFalse will dismiss the setting page right away

 *

 * @return TBool	ETrue if the setting page is to continue

 */

	IMPORT_C virtual TBool PostDisplayCheckL();

/** 

 * This framework method is used to update the contents of the CBA in a custom way.

 * Some setting page classes implement a degree of validation and will implement this.

 * Derived classes should ensure that this is being called frequently enough for their

 * purposes.

 */

	IMPORT_C virtual void UpdateCbaL();

/**

 * Called to access the validity state of the data

 *

 * @return TBool ETRrue if the data is valid

 */

	IMPORT_C TBool DataValidity() const;

/**

 * used to set the validity of the data

 *

 * @param TBool aValid	Sets the validity true or false

 */

	IMPORT_C void SetDataValidity(TBool aValid);

/**

 * Framework method to set the validity of the data

 * This is called when the data changes.

 *