/*

* Copyright (c) 2002-2007 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:  EIKON button group container class definition.

*

*/

#ifndef __EIKBTGPC_H__

#define __EIKBTGPC_H__

#include <coecntrl.h>

#include <eikbtgrp.h>

#include <eikcmobs.h>

#include <lafpublc.h>

#include <uikon.hrh>

#include <AknControl.h>

class MEikCommandObserver;

class CEikButtonGroupStack;

class CEikCommandButton;

class CEikListBox;

/**

 * The CEikButtonGroupContainer class provides a wrapper around the different button arrays

 * used in pen and no-pen devices. 

 *

 * @lib eikcoctl.lib 

 * @since S60 0.9 

 */

NONSHARABLE_CLASS(CEikButtonGroupContainer) : public CAknControl, public MEikCommandObserver

    {

public:

    /** 

     * Declares an object type for a class, in order to allow the object

     * provider mechanism to locate and provide objects from the class.

     */

    DECLARE_TYPE_ID(0x101F4107)

    /**

     * Describes how the container is being used.

     *

     * The enumeration is used by the system to create the appropriate (UI variant-specific)

     * button group for the specified type.

     */

    enum TUse

        {

        EView          = SLafButtonGroupContainer::EView,         ///< In a view.

        EDialog        = SLafButtonGroupContainer::EDialog,       ///< In a dialog.

        EToolbar       = SLafButtonGroupContainer::EToolbar,      ///< In a toolbar.

        ECba           = SLafButtonGroupContainer::ECba,          ///< In a control button array.

        EDialogButtons = SLafButtonGroupContainer::EDialogButtons ///< In dialog buttons.

        };

    /**

     * Describes the orientation of the container.

     */        

    enum TOrientation

        {

        EVertical   = SLafButtonGroupContainer::EVertical,  ///< Buttons are laid out vertically.

        EHorizontal = SLafButtonGroupContainer::EHorizontal ///< Buttons are laid out horizontally.

        };

    /**

     * Relative positions of the container and the control which uses it.

     */        

    enum TLocation

        {

        /** The button group is internal to the control which is using it. E.g. dialog buttons. */

        EInternal   = SLafButtonGroupContainer::EInternal, 

        /** The button group is external to the control which is using it. E.g. toolbar or cba. */

        EExternal   = SLafButtonGroupContainer::EExternal  

        };

    /**

     * Flags for the display of hotkeys.

     */        

    enum THotKeyFlags

        {

        EShowHotKey      = 0x01, ///< Hotkeys for commands should be shown.

        EPlainHotKey     = 0x02  ///< Hotkeys for commands should not be shown.

        };

    /** 

     * Additional flags.

     */         

    enum TFlags

        {

        EAddToStack      = 0x01, ///< Not used.

        EDelayActivation = 0x02, ///< If set, the container is not activated during construction.

        EUseMaxSize      = 0x04,  ///< Not used.

        EIsEmbedded      = 0x08, ///< Embedded in a dialog or popup.

        EParentIsControl = 0x10  ///< Parent window group is treated as CCoeControl.

        };

    /**

     * Defines the positions for each command.   

     */   

    enum TCommandPosition

        {

        ELeftSoftkeyPosition    = 0, ///< Position for left softkey.

        ERightSoftkeyPosition   = 2, ///< Position for right softkey.

        EMiddleSoftkeyPosition  = 3  ///< Position for middle softkey.

        };

public:

    /**

     * Creates a button group container in its own window.

     *

     * @param aUse The button group's type. 

     * @param aOrientation The button group's orientation. You need specify this 

     *                     only for devices that can layout their buttons either 

     *                     horizontally or vertically.

     * @param aCommandObserver A command observer to be notified of commands on 

     *                         the container.

     * @param aResourceId A resource containing descriptions of buttons in the group. 

     *                    This can be NULL if buttons are to be added dynamically.

     * @param aFlags The button group's flags.

     * @return Button group container object.

     */ 

    IMPORT_C static CEikButtonGroupContainer* NewL(

        TUse aUse,

        TOrientation aOrientation,

        MEikCommandObserver* aCommandObserver,

        TInt aResourceId,

        TUint aFlags = EAddToStack);

    /**

     * Creates a button group container in its parent control's window.

     *

     * @param aUse The button group's type.

     * @param aOrientation The button group's orientation. You need specify this 

     *                     only for devices that can layout their buttons either 

     *                     horizontally or vertically.

     * @param aCommandObserver A command observer to be notified of commands on 

     *                         the container.

     * @param aResourceId A resource containing descriptions of buttons in the group. 

     *                    This can be NULL if buttons are to be added dynamically.

     * @param aParent The control's parent.

     * @param aFlags The button group's flags.

     * @return Button group container object.

     */         

    IMPORT_C static CEikButtonGroupContainer* NewL(

        TUse aUse,

        TOrientation aOrientation,

        MEikCommandObserver* aCommandObserver,

        TInt aResourceId,

        const CCoeControl& aParent,

        TUint aFlags = EAddToStack);

    /**

     * Creates a button group container in given window group.

     *

     * @param aUse The button group's type.

     * @param aOrientation The button group's orientation. You need specify this 

     *                     only for devices that can layout their buttons either 

     *                     horizontally or vertically.

     * @param aCommandObserver A command observer to be notified of commands on 

     *                         the container.

     * @param aResourceId A resource containing descriptions of buttons in the group. 

     *                    This can be NULL if buttons are to be added dynamically.

     * @param aParentWg The parent window group.

     * @param aFlags The button group's flags.

     * @return Button group container object.

     */        

    IMPORT_C static CEikButtonGroupContainer* NewL(

        TUse aUse,

        TOrientation aOrientation,

        MEikCommandObserver* aCommandObserver,

        TInt aResourceId,

        RWindowGroup& aParentWg,

        TUint aFlags = EAddToStack);

    /**

     * Destructor.

     */        

    IMPORT_C ~CEikButtonGroupContainer();

    /**

     * Gets a pointer to an application's currently active CEikButtonGroupContainer (if any).

     *

     * Returns NULL if there are no containers active or none suitable for sharing. 

     * Ownership of the returned pointer is not transferred.

     *

     * @return Pointer to the button group container.

     */    

    IMPORT_C static CEikButtonGroupContainer* Current();

public:

    /**

     * Sets a command button's text label and command ID.

     *

     * @param aPosition The position within the button group of the button to change.

     *                  If the position is out of range this function raises a panic.

     * @param aCommandId Command ID the button will send.

     * @param aText Text for the button.

     */

    inline void SetCommandL(

        TInt aPosition, 

        TInt aCommandId, 

        const TDesC& aText);

    /**

     * Sets a command button's bitmap and command ID.

     *

     * @param aPosition The position within the button group of the button to change. 

     *                  If the position is out of range this function raises a panic.

     * @param aCommandId Command ID the button will send.

     * @param aBitmap The bitmap for the button.

     * @param aMask The mask bitmap for aBitmap.

     */    

    inline void SetCommandL(

        TInt aPosition, 

        TInt aCommandId, 

        const CFbsBitmap& aBitmap,

        const CFbsBitmap& aMask);

    /**

     * Sets a command button's bitmap, text and command ID.

     *

     * @param aPosition The position within the button group of the button to change. 

     *                  If the position is out of range, the function raises a panic.

     * @param aCommandId Command ID the button will send.

     * @param aText The text for the button.

     * @param aBitmap The bitmap for the button.

     * @param aMask The mask bitmap for aBitmap.

     */        

    inline void SetCommandL(

        TInt aPosition, 

        TInt aCommandId, 

        const TDesC& aText,

        const CFbsBitmap& aBitmap,

        const CFbsBitmap& aMask);

    /**

     * Sets a command button's bitmap and command ID. The bitmap and its mask are read

     * from a file.

     *

     * @param aPosition The position within the button group of the button to change.

     *                  If the position is out of range, the function raises a panic.

     * @param aCommandId Command ID the button will send.

     * @param aFile A multi-bitmap file, containing mask and bitmap images.

     * @param aBitmapId ID of the bitmap within aFile.

     * @param aMaskId ID of the mask within aFile.

     */        

    inline void SetCommandL(

        TInt aPosition, 

        TInt aCommandId, 

        const TDesC& aFile,

        TInt aBitmapId,

        TInt aMaskId);

    /**

     * Sets a command button's bitmap, text label and command ID. The bitmap and its 

     * mask are read from a file.

     *

     * @param aPosition The position within the button group of the button to change.

     *                  If the position is out of range, the function raises a panic.

     * @param aCommandId Command ID the button will send.

     * @param aText The text for the button.

     * @param aFile A multi-bitmap file, containing mask and bitmap images.

     * @param aBitmapId ID of the bitmap within aFile.

     * @param aMaskId ID of the mask within aFile.

     */        

    inline void SetCommandL(

        TInt aPosition, 

        TInt aCommandId, 

        const TDesC& aText,

        const TDesC& aFile,

        TInt aBitmapId,

        TInt aMaskId);

    /**

     * Sets a command button's bitmap, text label and command ID. The bitmap, mask,

     * text and command ID are all read from resource.

     *

     * @param aPosition The position within the button group of the button to change.

     *                  If the position is out of range, the function raises a panic.

     * @param aResourceId Resource ID specifying the text, bitmaps and command ID.

     */        

    inline void SetCommandL(

        TInt aPosition, 

        TInt aResourceId);

    /**

     * Sets a command button's text. The button to change is identified by its command ID.

     *

     * @param aCommandId Command ID of the button to change.

     * @param aText The text for the button.

     * @leave KErrNotFound The ID cannot be matched to any button.

     */        

    inline void SetCommandL(

        TInt aCommandId, 

        const TDesC& aText);

    /**

     * Sets a command button's bitmap and mask. The button to change is identified 

     * by its command ID.

     *

     * @param aCommandId Command ID of the button to change.

     * @param aBitmap Bitmap for the button.

     * @param aMask Mask bitmap for aBitmap.

     * @leave KErrNotFound The ID cannot be matched to any button.

     */        

    inline void SetCommandL(

        TInt aCommandId, 

        const CFbsBitmap& aBitmap,

        const CFbsBitmap& aMask);

    /**

     * Sets a command button's bitmap, mask and text. The button to change is 

     * identified by its command ID.

     *

     * @param aCommandId Command ID of the button to change.

     * @param aText Text for the button.

     * @param aBitmap Bitmap for the button.

     * @param aMask Mask bitmap for aBitmap.

     */        

    inline void SetCommandL(

        TInt aCommandId, 

        const TDesC& aText,

        const CFbsBitmap& aBitmap,

        const CFbsBitmap& aMask);

    /**

     * Sets a command button's bitmap and mask. The bitmap and mask are read from 

     * a multi bitmap file. The button to change is identified by its command ID.

     *

     * @param aCommandId Command ID of the button to change.

     * @param aFile A multi-bitmap file, containing mask and bitmap images.

     * @param aBitmapId ID of the bitmap within aFile.

     * @param aMaskId ID of the mask within aFile.

     */        

    inline void SetCommandL(

        TInt aCommandId, 

        const TDesC& aFile,

        TInt aBitmapId,

        TInt aMaskId);

    /**

     * Sets a command button's bitmap, mask and text. The bitmap and its mask are read 

     * from a multi bitmap file. The button to change is identified by its command ID.

     *

     * @param aCommandId Command ID of the button to change.

     * @param aText Text for the button.

     * @param aFile  A multi-bitmap file, containing mask and bitmap images.

     * @param aBitmapId ID of the bitmap within aFile.

     * @param aMaskId ID of the mask within aFile.

     */        

    inline void SetCommandL(

        TInt aCommandId, 

        const TDesC& aText,

        const TDesC& aFile,

        TInt aBitmapId,

        TInt aMaskId);

    /**

     * Initialises the group of command buttons from a resource.

     *

     * @param aResourceId ID of the resource structure specifying the command buttons.

     */        

    IMPORT_C void SetCommandSetL(

        TInt aResourceId);   

    /**

     * Adds a command button with a text label and command ID.

     *

     * @param aPosition The position in the button group for the new button.

     * @param aCommandId Command ID for the new button.

     * @param aText Text for the button.          

     */   

    inline void AddCommandL(

        TInt aPosition, 

        TInt aCommandId,

        const TDesC& aText);

    /**

     * Adds a command button with a bitmap label and command ID.

     *

     * @param aPosition The position in the button group for the new button.

     * @param aCommandId Command ID for the new button.

     * @param aBitmap Bitmap for the button.

     * @param aMask Mask bitmap for aBitmap.

     */        

    inline void AddCommandL(

        TInt aPosition, 

        TInt aCommandId,

        const CFbsBitmap& aBitmap,

        const CFbsBitmap& aMask);

    /**

     * Adds a command button with a command ID and a label containing both 

     * a bitmap and text.

     *

     * @param aPosition The position in the button group for the new button.

     * @param aCommandId Command ID for the new button.

     * @param aText Text for the button.

     * @param aBitmap Bitmap for the button.

     * @param aMask Mask bitmap for aBitmap.

     */        

    inline void AddCommandL(

        TInt aPosition, 

        TInt aCommandId,

        const TDesC& aText,

        const CFbsBitmap& aBitmap,

        const CFbsBitmap& aMask);

    /**

     * Adds a command button with a command ID and a bitmap which is read from a file.

     *

     * @param aPosition The position in the button group for the new button.

     * @param aCommandId Command ID for the new button.

     * @param aFile Multi-bitmap file containing the bitmap and mask.

     * @param aBitmapId ID of the bitmap within aFile.

     * @param aMaskId ID of the mask within aFile.

     */        

    inline void AddCommandL(

        TInt aPosition, 

        TInt aCommandId,

        const TDesC& aFile,

        TInt aBitmapId,

        TInt aMaskId);

    /**

     * Adds a command button with a command ID and a label containing both a bitmap 

     * and text. The bitmap and mask are read from file.

     *

     * @param aPosition The position in the button group for the new button.

     * @param aCommandId Command ID for the new button.

     * @param aText Text for the button.

     * @param aFile Multi-bitmap file containing the bitmap and mask.

     * @param aBitmapId ID of the bitmap within aFile.

     * @param aMaskId ID of the mask within aFile.

     */        

    inline void AddCommandL(

        TInt aPosition, 

        TInt aCommandId,

        const TDesC& aText,

        const TDesC& aFile,

        TInt aBitmapId,

        TInt aMaskId);

    /**

     * Pushes a command button with a text label and command ID onto a position's 

     * button stack. This function behaves similarly to SetCommandL() but allows 

     * the previous command button to be retrieved by calling RemoveCommandFromStack().

     *

     * @param aPosition The position in the button group at which to add the command button. 

     * @param aCommandId Command ID the button will send.

     * @param aText Text for the button.

     */        

    inline void AddCommandToStackL(

        TInt aPosition,

        TInt aCommandId,

        const TDesC& aText);

    /**

     * Pushes a command button with a bitmap, mask and command ID onto a position's 

     * button stack. This function behaves similarly to SetCommandL() but allows the 

     * previous command button to be retrieved by calling RemoveCommandFromStack(). 

     *

     * @param aPosition The position in the button group at which to add the command button.

     * @param aCommandId Command ID the button will send.

     * @param aBitmap Bitmap for the button.

     * @param aMask Mask bitmap for aBitmap.

     */        

    inline void AddCommandToStackL(

        TInt aPosition,

        TInt aCommandId,

        const CFbsBitmap& aBitmap,

        const CFbsBitmap& aMask);

    /**

     * Pushes a command button with text, bitmap, mask and a command ID onto a position's

     * button stack. This function behaves similarly to SetCommandL() but allows the 

     * previous command button to be retrieved by calling RemoveCommandFromStack().

     *

     * @param aPosition The position in the button group at which to add the command button.

     * @param aCommandId Command ID the button will send.

     * @param aText Text for the button.

     * @param aBitmap Bitmap for the button.

     * @param aMask Mask bitmap for aBitmap.

     */        

    inline void AddCommandToStackL(

        TInt aPosition,

        TInt aCommandId,

        const TDesC& aText,

        const CFbsBitmap& aBitmap,

        const CFbsBitmap& aMask);

    /**

     * Pushes a command button with a bitmap, mask and command ID onto a position's button 

     * stack. The bitmap and mask are read from a file. This function behaves similarly to 

     * SetCommandL() but allows the previous command button to be retrieved by calling 

     * RemoveCommandFromStack().

     *

     * @param aPosition The position in the button group at which to add the command button.

     * @param aCommandId Command ID the button will send.

     * @param aFile A multi-bitmap file containing mask and bitmap.

     * @param aBitmapId Index into the file of the bitmap.

     * @param aMaskId Index into the file of the bitmap mask.

     */        

    inline void AddCommandToStackL(

        TInt aPosition,

        TInt aCommandId,

        const TDesC& aFile,

        TInt aBitmapId,

        TInt aMaskId);

    /**

     * Pushes a command button with text, bitmap, mask and command button onto a position's 

     * button stack. The bitmap and mask are read from a file. This function behaves similarly

     * to SetCommandL() but allows the previous command button to be retrieved by calling 

     * RemoveCommandFromStack(). 

     *

     * @param aPosition The position in the button group at which to push the command button.

     * @param aCommandId Command ID the button will send.

     * @param aText Text for the button.

     * @param aFile A multi-bitmap file containing mask and bitmap.

     * @param aBitmapId Index into the file of the bitmap.

     * @param aMaskId Index into the file of the bitmap mask.

     */        

    inline void AddCommandToStackL(

        TInt aPosition,

        TInt aCommandId,

        const TDesC& aText,

        const TDesC& aFile,

        TInt aBitmapId,

        TInt aMaskId);

    /**

     * Pushes a command button onto a position's button stack. The text, bitmap, mask and 

     * command ID are all read from resource. This function behaves similarly to 

     * SetCommandL() but allows the previous command button to be retrieved by calling 

     * RemoveCommandFromStack().

     *

     * @param aPosition The position in the button group at which to push the command button.

     * @param aResourceId ID of a resource specifying the text, bitmaps and command ID.

     */        

    inline void AddCommandToStackL(

        TInt aPosition,

        TInt aResourceId);

    /**

     * As with SetCommandL() but for a set of buttons, also allows the previous command 

     * button to be retrieved by calling RemoveCommand().

     *

     * @param aResourceId Resource describing the set of command buttons.

     */        

    IMPORT_C void AddCommandSetToStackL(

        TInt aResourceId);

    /**

     * Removes the command identified by aCommandId, in position aPosition in the group,

     * from the command stack. Automatically retrieves the previous command details. 

     * Commands are added to the stack by calling AddCommandToStackL.

     *

     * @param aPosition The position in the button group from which to remove the 

     *                  command button.

     * @param aCommandId Command ID.

     */        

    IMPORT_C void RemoveCommandFromStack(TInt aPosition, TInt aCommandId);

    /**

     * Sets the default command ID for buttons in this container.

     *

     * @param aCommandId Command to issue if no other is specified.

     */    

    IMPORT_C void SetDefaultCommand(TInt aCommandId); 

    /**

     * Calculates minimum size required to display the buttons defined in the specified

     * resource structure.

     *

     * @param aResourceId The ID of the resource structure describing the button group.

     * @return Minimum size required to display the button group defined in the specified resource structure.

     */    

    IMPORT_C TSize CalcMinimumSizeL(TInt aResourceId) const;    

    /**

     * Places the command in position aPosition in the group on the cleanup stack. Typically 

     * used when a control or view changes the contents of two or more buttons on receipt of 

     * focus. After altering one command with a call to AddCommandToStackL() the push is made 

     * to guarantee the display will be left in a consistent state if the second (and any 

     * subsequent) calls to AddCommandToStackL() fail. Only a single command can be pushed 

     * for each position.

     *

     * @param aPosition Position in the container of the button to push.

     */    

    IMPORT_C void CleanupCommandPushL(TInt aPosition);

    /**

     * Removes a command from the cleanup stack without destroying it.

     */    

    inline void CleanupCommandPop();

    /**

     * Removes one or more commands from the cleanup stack without destroying them.

     *

     * @param aCount Number of commands to pop.

     */    

    IMPORT_C void CleanupCommandPop(TInt aCount);       

    /**

     * Removes a single command which was pushed onto the cleanup stack. It does this by 

     * calling CleanupCommandPushL(), rolling back to the previous details. The command

     * button popped is destroyed.

     */    

    inline void CleanupCommandPopAndDestroy();

    /**

     * Removes one or more commands which were pushed onto the cleanup stack. It does this 

     * by calling CleanupCommandPushL(), rolling back to the previous details. The command 

     * buttons popped are destroyed.

     *

     * @param aCount Number of commands to pop and destroy.

     */    

    inline void CleanupCommandPopAndDestroy(TInt aCount);   

    /**

     * Gets the maximum number of buttons that can be supported by the device.

     *

     * @return The number of command buttons supported.

     */    

    IMPORT_C TInt MaxCommands() const;

    /**

     * Gets the total number of buttons currently present in the group.

     *

     * @return The number of buttons.

     */    

    IMPORT_C TInt ButtonCount() const;

    /**

    * Dims (but doesn't draw) the button with id aCommandId if aDimmed is ETrue. If two 

    * buttons have the same id, the button to be dimmed is undefined.

    *

    * @param aCommandId The id for command to be dimmed.

    * @param aDimmed ETrue for dimming.

    */

    IMPORT_C void DimCommand(TInt aCommandId, TBool aDimmed);

    /**

    * Returns ETrue if the button with id aCommandId is dimmed. If two buttons have 

    * the same id, the results of this check are undefined.

    *

    * @param aCommandId The id for command to be checked.

    * @return The state of the button.    

    */

    IMPORT_C TBool IsCommandDimmed(TInt aCommandId) const;

    /**

    * Sets the the button with id aCommandId to be visible if aVisible is ETrue. If two 

    * buttons have the same id, the button to be altered is undefined.

    *

    * @param aCommandId The id for command to be made visible.

    * @param aVisible EFalse for making button invisible.

    */

    IMPORT_C void MakeCommandVisible(TInt aCommandId, TBool aVisible);

    /**

    * Returns ETrue if the button with id aCommandId is visible. If two buttons have 

    * the same id, the results are undefined.

    *

    * @param aCommandId The id for command to be checked.

    * @return The state of the button.     

    */

    IMPORT_C TBool IsCommandVisible(TInt aCommandId) const;

    /**

    * Animates the button with id aCommandId. If two buttons have the same id, the 

    * button to be animated is undefined.

    *

    * @since S60 3.1

    * @param aCommandId The id for command to be animated.   

    */

    IMPORT_C void AnimateCommand(TInt aCommandId);

    /**

    * Dims (but doesn't draw) the button with position aPosition.

    *

    * @since S60 3.1

    * @param aPosition The position for command to be dimmed.

    * @param aDimmed ETrue for dimming.

    */

    IMPORT_C void DimCommandByPosition(TCommandPosition aPosition, TBool aDimmed);

    /**

    * Returns ETrue if the button with position aPosition is dimmed.

    *

    * @since S60 3.1

    * @param aPosition The position for command to be checked.

    * @return The state of the button.    

    */

    IMPORT_C TBool IsCommandDimmedByPosition(TCommandPosition aPosition) const;

    /**

    * Sets the the button with position aPosition to be visible if aVisible is ETrue.

    *

    * @since S60 3.1

    * @param aPosition The position for command to be made visible.

    * @param aVisible EFalse for making button invisible.

    */

    IMPORT_C void MakeCommandVisibleByPosition(TCommandPosition aPosition, TBool aVisible);

    /**

    * Returns ETrue if the button with position aPosition is visible.

    *

    * @since S60 3.1

    * @param aPosition The position for command to be checked.

    * @return The state of the button.     

    */

    IMPORT_C TBool IsCommandVisibleByPosition(TCommandPosition aPosition) const;

    /**

    * Animates the button with position aPosition.

    *

    * @since S60 3.1

    * @param aPosition The position for command to be animated.    

    */

    IMPORT_C void AnimateCommandByPosition(TCommandPosition aPosition);

    /**

     * Gets the button group's location. Typically the button group is external to the 

     * view which is using it. In some cases, such as in dialogs with button panels, 

     * the button group is internal to the control which is using it.

     *

     * @return The button group's location.

     */  

    IMPORT_C TLocation Location() const;

    /**

     * Gets a pointer to the command button with the specified command Id.

     *

     * @param aCommandId Command ID of the button.

     * @return Pointer to the command button CEikCommandButton, NULL if there 

     *         was no button with Id aCommandId.

     */      

    IMPORT_C CEikCommandButton* CommandButtonOrNull(TInt aCommandId) const;

    /**

     * Sets the boundary rectangle for externally-positioned button groups. 

     * For use by EExternal button groups only.

     * 

     * @param aRect The boundary rectangle to use. The button group attaches 

     *              itself to the inside of this rectangle.

     */    

    IMPORT_C void SetBoundingRect(const TRect& aRect);

    /**

     * Subtracts the area occupied by the button group from the specified bounding 

     * rectangle. This method should be used in preference to querying the container's 

     * area at all times. For use by EExternal button groups only.

     * 

     * @param aBoundingRect Rectangle to be modified.

     */        

    IMPORT_C void ReduceRect(TRect& aBoundingRect) const;

    /**

     * Gets a pointer to the control (button) with the specified command ID. 

     * This method is intended to allow access to standard CCoeControl functionality 

     * only. Casting the return value is likely to fail on different devices.

     *

     * @param aCommandId Command ID of the button to get.

     * @return Pointer to a CCoeControl, NULL if there was no button at aCommandId.

     */

    IMPORT_C CCoeControl* ControlOrNull(TInt aCommandId) const;

    /**

     * Gets a pointer to the the button with the specified command Id.

     *

     * @param aCommandId Command ID of the button to obtain.

     * @return The button object.

     */    

    IMPORT_C CEikCommandButton* ButtonById(TInt aCommandId) const;

    /**

     * Gets the position in the group of the button with the specified command Id.

     * The return value is undefined if two buttons share the same id.

     *

     * @param aCommandId Identifies the command.

     * @return The command's container position.

     */     

    IMPORT_C TInt PositionById(TInt aCommandId) const;

    /**

     * Updates a command's hotkey and whether the key is displayed. 

     * This function is only supported by containers being used for dialog buttons.

     *

     * @param aCommandId Identifies the command to update.

     * @param aFlags Whether to display the hotkey.

     * @param aKeyId Hotkey identifier.

     */    

    IMPORT_C void UpdateHotKey(TInt aCommandId, THotKeyFlags aFlags, TInt aKeyId);

    /**

     * Changes the command observer for the button at aPos to aCommandObserver. 

     * Panics if an updated observer is already present. This function should be followed 

     * by RemoveCommandObserver() when you need to put back the original observer.

     *

     * @param aPos The button's position.

     * @param aCommandObserver The command observer.

     */    

    IMPORT_C void UpdateCommandObserverL(TInt aPos, MEikCommandObserver& aCommandObserver);

    /**

     * Removes the temporary observer for the button at aPos, replacing it with the

     * observer that was present when UpdateCommandObserverL() was called.

     *

     * @param aPos The button's position.

     */    

    IMPORT_C void RemoveCommandObserver(TInt aPos);

    /**

     * Checks for existence of updated command observer for the button at aPosition.

     *

     * @since S60 3.2

     * @param aPosition The position for button to be checked.

     * @return ETrue, if updated command observer exists.

     */    

    IMPORT_C TBool UpdatedCommandObserverExists(TCommandPosition aPosition) const;

    /**

     * Tests whether the button group has explicitly been instructed to suppress redraws.

     * Some button groups may not activate themselves during construction, in which 

     * case, they need to be activated by the client. This method allows the client 

     * to enquire whether this is necessary.

     *

     * @return ETrue if the button group will suppress redraws, otherwise EFalse.

     */    

    IMPORT_C TBool DelayActivation() const;

    /**

     * Returns the container's button group.

     *

     * @return Pointer to the button group object. Ownership is not transferred.

     */    

    inline MEikButtonGroup* ButtonGroup();

    /**

     * Returns the button group type.

     *

     * @return The button group type.

     */    

    inline TUse ButtonGroupType();

    /**

    * Internal method for setting markable list's MSK observer.

    * This observer is called before default CBA observer if MSK is pressed.

    * Observer is removed by passing NULL as parameter.

    *

    * @since S60 3.1

    * @param aMSKObserverOwner

    * @param aCommandObserver

    */

    void UpdateMSKCommandObserver(

        CEikListBox* aMSKObserverOwner, 

        MEikCommandObserver* aCommandObserver);

public: // From CCoeControl.

    /**

     * From CCoeControl.

     * Gets the control's minimum required size.

     *

     * @return The minimum size required by the control.

     */ 

    IMPORT_C TSize MinimumSize();

    /**

     * From CCoeControl.

     * Handles key events.

     *

     * @param aKeyEvent The key event. 

     * @param aType The type of key event: EEventKey, EEventKeyUp or EEventKeyDown. 

     * @return Indicates whether or not the key event was used by this control. 

     */     

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

    /**

     * From CCoeControl.

     * Sets this control as visible or invisible.

     *

     * @param aVisible ETrue to make the control visible, EFalse to make it invisible. 

     */     

    void MakeVisible(TBool aVisible);

    /**

     * From CCoeControl.

     * Writes the internal state of the control and its components to aStream.

     * Does nothing in release mode.

     *

     * @param aWriteStream The output stream.

     */     

    IMPORT_C void WriteInternalStateL(RWriteStream& aWriteStream) const;

public:

    /**

     * Formerly from MTopSetMember<CEikButtonGroupContainer>, now reserved.

     */ 

    IMPORT_C virtual void Reserved_MtsmPosition();

    /**

     * Formerly from MTopSetMember<CEikButtonGroupContainer>, now reserved.

     */     

    IMPORT_C virtual void Reserved_MtsmObject();

public: // New functions for enhanced cba support.

    /**

     * Used to offer list of commands for softkeys.

     *

     * @since S60 3.2

     * @param aCommandList A list of command ids to be offered for softkeys.

     */

    IMPORT_C void OfferCommandListL(const RArray<TInt>& aCommandList);

    /**

     * Used to offer list of commands for softkeys.

     *

     * @since S60 3.2

     * @param aResourceId Id for CBA resource that defines enhanced cba buttons.

     */ 

    IMPORT_C void OfferCommandListL(const TInt aResourceId);

    /**

     * Used to check if a certain command have been approved to the current command set

     *

     * @since S60 3.2

     * @param aCommandId The id for command which existence should be checked.

     * @return ETrue if command is in control group, otherwise EFalse.

     */     

    IMPORT_C TBool IsCommandInGroup(const TInt aCommandId) const;

    /**

     * Replaces command with another.

     *

     * @since S60 3.2 

     * @param aCommandId Id for command that should be replaced.

     * @param aResourceId Resource id for new enhanced cba button.

     */     

    IMPORT_C void ReplaceCommand(const TInt aCommandId, const TInt aResourceId);

private:

    enum TCommandOp {ESet, EAdd, EPush};

private:

    class TCmdPos

        {

    public:

        inline TCmdPos();

        inline TCmdPos(TInt aPos, TInt aCmd);

    public:

        TInt iPos;

        TInt iCmd;

        };

    class TCmdObserver

        {

    public:

        inline TCmdObserver(TInt aPos, MEikCommandObserver& aObserver);

    public:

        TInt iPos;

        MEikCommandObserver& iObserver;

        };

    class CCmdObserverArray : public CArrayFixFlat<TCmdObserver>

        {

    public:

        inline CCmdObserverArray();

        TInt FindIndex(TInt aPos);

        };

private:

    CEikButtonGroupContainer(TUse aUse);

    void ConstructL(

        TOrientation aOrientation,

        MEikCommandObserver* aCommandObserver,

        TInt aResourceId,

        RWindowGroup* aParentWg,

        TUint aFlags);