/*

* Copyright (c) 2003-2006 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:  The CMIDChoiceGroup control container. Owns and manipulates

*                the choicegroup model and creates / deletes the actual

*                control as needed.

*

*/

#ifndef CMIDCHOICEGROUPCONTROL_H

#define CMIDCHOICEGROUPCONTROL_H

#include <eiklbo.h>

#include <lcdui.h>

#include <AknUtils.h>

// CAknPopupList inheritance in CMIDChoiceGroupPopupList declaration

#include <aknPopup.h>

#include "CMIDChoiceGroupListBox.h"

#include "CMIDChoiceGroupModel.h"

#ifdef RD_SCALABLE_UI_V2

#include "CMIDForm.h"

#endif

#ifdef RD_TACTILE_FEEDBACK

#include <touchfeedback.h>

#endif

class CMIDChoiceGroupItem;

// Forward declaration for the observer interface

class CMIDChoiceGroupControl;

// Choicegroup control observer interface. The observer

// is notified when the control size changes, so that it can adjust

// its size accordingly

class MMIDChoiceGroupControlObserver

{

public:

    enum TChoiceGroupControlEvent

    {

        ESizeChanged,

        EScrollRequest

    };

public:

    virtual void HandleChoiceGroupControlEventL(

        CMIDChoiceGroupControl* aControl,

        TChoiceGroupControlEvent aEvent,

        TAny* aParam) = 0;

};

// Popup list that shows the contents of the popup choice group.

// This derived class is needed in order that opened popup can be

// properly resized if its content changes.

NONSHARABLE_CLASS(CMIDChoiceGroupPopupList) : public CAknPopupList

{

public:

    static CMIDChoiceGroupPopupList* NewL(CEikListBox* aListBox, TInt aCbaResource,

    AknPopupLayouts::TAknPopupLayouts aType);

    virtual ~CMIDChoiceGroupPopupList();

    // Resizes the popup list

    void ResizeList();

#ifdef RD_SCALABLE_UI_V2

public: // from CCoeControl

    void HandlePointerEventL(const TPointerEvent& aPointerEvent);

#endif //RD_SCALABLE_UI_V2

private:

    CMIDChoiceGroupPopupList();

};

// Choice group control. Encapsulates the actual control and popup

NONSHARABLE_CLASS(CMIDChoiceGroupControl) :

        public CCoeControl,

        public MEikListBoxObserver,

        public MMIDChoiceGroupModelObserver

{

public:

    // Constants identifying columns of column listobox data used

    // when choice group is created and layouted

    enum TColumnDataIndexes

    {

        ERadioButtonOrCheckBoxColumn,

        EUserDefinedImagesColumn,

        ETextColumn

    };

    CMIDChoiceGroupControl(

        MMIDChoiceGroup::TChoiceType aType,

        CMIDChoiceGroupItem* aItem);

    virtual ~CMIDChoiceGroupControl();

    // Constructs the ChoiceGroup control and the choicegroup model,

    // but does not yet create the actual listbox. The listbox is created

    // by a call to CreateActualControlL(), when the parent window

    // is known (ie when the CMIDChoiceGroupItem is added to a CMIDForm

    void ConstructL(

        RArray<TPtrC>& aStringArray,

        RArray<MMIDImage*>& aImageArray);

    // Creates the listbox control according to choice type and

    // fills it with elements, if the model already contains any

    void CreateControlL(const CCoeControl* aParent, const TRect& aRect);

    // Deletes the listbox control (when removed from a form). Does

    // not empty the model, however

    void DeleteControl();

    // Set coitrol observer associated with this control

    void SetObserver(MMIDChoiceGroupControlObserver* aObserver)

    {

        iObserver = aObserver;

    }

    // Get observer associated with this control

    MMIDChoiceGroupControlObserver* Observer()

    {

        return iObserver;

    }

    void HiliteFirstElement(TBool aEnableHighlight);

    void HiliteLastElement(TBool aEnableHighlight);

    void EnableListHighlight(TBool aEnable);

    TBool IsCurrentItemSelected();

    void ToggleCurrentItemSelectionL();

    // Nofication method to inform that the curent item has changed in the list

    void CurrentItemChanged();

    // Pops up the popup choice

    void DoPopupL();

    /**

     * Returns the number of elements in the choice group

     **/

    TInt NumberOfElements() const;

public: // delegated from MMIDChoiceGroup

    void InsertElementL(TInt aIndex, const TDesC& aText, MMIDImage* aImage);

    void DeleteElementL(TInt aIndex);

    void DeleteAllL();

    void SetElementL(TInt aIndex, const TDesC& aText, MMIDImage* aImage);

    void SelectElementL(TInt aIndex, TBool aSelected);

    TBool IsSelected(TInt aIndex);

    void SetFontL(TInt aIndex, MMIDFont* aFont);

    void SetFitPolicyL(TInt aFitPolicy);

public: // from MMIDChoiceGroupModelObserver

    virtual void HandleChoiceGroupModelEventL(

        CMIDChoiceGroupModel* aModel,

        TChoiceGroupModelEvent aEvent);

public: // from MEikListBoxObserver

    virtual void HandleListBoxEventL(CEikListBox* aControl, TListBoxEvent aEventType);

public: // from CCoeControl

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

#ifdef RD_SCALABLE_UI_V2

    void HandlePointerEventL(const TPointerEvent& aPointerEvent);

#endif //RD_SCALABLE_UI_V2

//    void SetContainerWindowL(const CCoeControl& aContainer);

    TInt CountComponentControls() const;

    CCoeControl* ComponentControl(TInt aIndex) const;

    void SizeChanged();

    void PositionChanged();

    // Calculates and returns the minimum size required by the control

    TSize MinimumSize() const;

    // Draws the control (only used in popup mode)

    virtual void Draw(const TRect& aRect) const;

    // Responds to focus change.

    void FocusChanged(TDrawNow aDrawNow);

    // Handles a change to control's resources.

    void HandleResourceChange(TInt aType);

    TTypeUid::Ptr MopSupplyObject(TTypeUid aId);

public:

    inline MMIDChoiceGroup::TChoiceType ChoiceType() const;

    void ClosePopup();

    // Sets up the columndata columns

    void SetupColumnsL(CColumnListBoxData* aColumnData);

    /**

     * Shows info popup for the current item if text does not fit and was ellipsed

     */

    void ShowInfoPopup();

    /**

     * Scrolls the form in order to get the focused sub-item on screen

     */

    void RestoreFocus();

#ifdef RD_SCALABLE_UI_V2

    /**

     * In timed scrolling calculates the needed scroll amount and

     * requests (via CMIDChoiceGroupItem) the form to scroll.

     *

     * @param aDirection    The direction of the scroll

     */

    void TimedScroll(CMIDForm::TDirection aDirection);

#endif

#ifdef RD_JAVA_S60_RELEASE_9_2

    CMIDForm* Form() const;

#endif // RD_JAVA_S60_RELEASE_9_2    

#ifdef RD_TACTILE_FEEDBACK

private:

    MTouchFeedback* iFeedback;

#endif

protected:

private:

    void DrawIcon(CGulIcon* aIcon) const;

    void DrawText(const TDesC& aText) const;

    // Fill listbox model with items given at construct time

    void PopulateModelL(RArray<TPtrC>& aStringArray,RArray<MMIDImage*>& aImageArray);

    // Creates a new element with text and image

    CMIDChoiceGroupElement* NewElementLC(const TDesC& aString, MMIDImage* aImage);

    // Report control event to observer

    void ReportEventL(MMIDChoiceGroupControlObserver::TChoiceGroupControlEvent aEvent,

                      TAny* aParam = NULL);

    // Calculates, whether the current item in the choice is visible,

    // and requests a form scroll, if necessary

    void RequestScrollIfNeededL();

    // Functions for creating the choice listbox. Create() uses Allocate()

    // and Construct(). Split to enable using LB pointer as parameter to

    // AknPopup, and AknPopup in turn as parent to LB construction

    CMIDChoiceGroupListBox* CreateListBoxL(const CCoeControl* aParent = NULL);

    CMIDChoiceGroupListBox* AllocateListBoxL();

    void ConstructListBoxL(

        CMIDChoiceGroupListBox* aListBox,

        const CCoeControl* aParent = NULL);

    // Deletes the choice listbox (taking care not to destroy the icon array)

    void DeleteListBox(CMIDChoiceGroupListBox* aListBox);

    // Returns whether this is a popup

    inline TBool IsPopup() const;

    TRect ListBoxRect(const TRect& aRect) const;

    /**

     * Sets selection state of element at <aIndex> and posts a java event

     * if needed

     *

     * @param   aIndex      The index of the element

     * @param   aSelected   The new selection state of the element

     * @param   aPostEvent  If true, itemStateChanged event is sent to the midlet

     */

    void CMIDChoiceGroupControl::SelectElementL(TInt aIndex, TBool aSelected,

            TBool aPostEvent);

    void UpdateMargins();

    void UpdatePopupListAppearanceL(TChoiceGroupModelEvent aEvent);

#ifdef RD_SCALABLE_UI_V2

    /**

     * Finds the index of the first choicegroup element of which more than half is outside the

     * visible form area. aScrollDirection indicates if the element is searched on the top or

     * bottom of the form. The choicegroup listbox must be partially on visible form area in order

     * this function to return a valid index. If the listbox is fully invisible, KErrNotFound is returned.

     *

     * @param aScrollDireection     The direction to which the form is being scrolled

     * @return  Index of the element if element is found in wanted direction, KErrNotFound otherwise

     */

    TInt FirstInvisibleElement(CMIDForm::TDirection aScrollDirection) const;

#endif

private:

    // Type of the choicegroup (list, popup)

    MMIDChoiceGroup::TChoiceType iType;

    // The parent item

    CMIDChoiceGroupItem* iItem;

    // Observer (usually the form item)

    MMIDChoiceGroupControlObserver* iObserver;

    // Element container model (owned outside of the listbox, because

    // elements may be added before the control is added to a form, ie

    // before the listbox has a parent window and can be created)

    CMIDChoiceGroupModel* iModel;

    // The actual listbox control

    CMIDChoiceGroupListBox* iListBox;

    /** The rect for placing the icon of the popup choice group, see SizeChanged() */

    TRect iPopupIconRect;

    /** The layout object for drawing the popup choice group text, see SizeChanged() */

    TAknLayoutText iPopupTextLayout;

    // Margins for choicegroup content. This includes also the margin between the label and listbox.

    TMargins8 iContentMargins;

    // Pointer to the popup list. This is needed in order that popup can be properly updated

    // if the list box model is modified while the popup is open. No need to delete

    // iPopupList in destructor because popup list is created and deleted in DoPopupL().

    // iPopupList is valid only while popup list is open, otherwise it is NULL.

    CMIDChoiceGroupPopupList* iPopupList;

#ifdef RD_SCALABLE_UI_V2

    TBool iPointerDragHasStarted; //True if drag has started

    // True if focus has changed between TPointerEvent::EButton1Down and

    // TPointerEvent::EButton1Up events.

    TBool iFocusChangingWithPen;

#endif //RD_SCALABLE_UI_V2

};

// --- Inlines

// Return choice group type

inline MMIDChoiceGroup::TChoiceType CMIDChoiceGroupControl::ChoiceType() const

{

    return iType;

}

// Returns whether this is a popup

inline TBool CMIDChoiceGroupControl::IsPopup() const

{

    return (iType == MMIDChoiceGroup::EPopup);

}

#endif // CMIDCHOICEGROUPCONTROL_H