/*

* 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:  Implements the Form LCDUI component.

*

*/

#ifndef CMIDFORM_H

#define CMIDFORM_H

// CCoeControl inheritance in class declaration

#include <coecntrl.h>

// MEikScrollBarObserver interface in class declaration

#include <eiksbobs.h> //MEikScrollBarObserver

#include <lcdui.h>

// using Timer to do defer laying out (iLayoutTimer member)

#include <TimeOutTimer.h>

#ifdef RD_TACTILE_FEEDBACK

#include <touchfeedback.h>

#endif

// Layout of Rect of midp_form_pane

#include <AknUtils.h>

class CEikScrollBarFrame;

class CEikLabel;

class CMIDItem;

class CMIDItemLabel;

class CMIDControlItem;

class CMIDDisplayable;

class CMIDSpacer;

class CMIDStringItem;

class CMIDCommandList;

class CMIDFormRow;

class CAknsListBoxBackgroundControlContext;

class CAknsFrameBackgroundControlContext;

class CMIDCommand;

class CMIDPopupNoteController;

class CMIDFormPhysics;

/**

 * A form class as defined in MMIDForm. Manages items (MMIDItems) using rows, CMIDFormRow.

 *

 * @see CMIDFormRow, CMIDItem, CMIDControlItem and item derived classes.

 */

#ifdef RD_SCALABLE_UI_V2

NONSHARABLE_CLASS(CMIDForm) : public CCoeControl, public MCoeControlObserver,

        public MMIDForm, public MTimeOutNotify, public MEikScrollBarObserver

#else

NONSHARABLE_CLASS(CMIDForm) : public CCoeControl, public MCoeControlObserver,

        public MMIDForm, public MTimeOutNotify

#endif //RD_SCALABLE_UI_V2

{

public:

    enum TDirection

    {

        EDown=6,

        EUp=1,

        ELeft=2,

        ERight=5,

        ENone=0

    };

    enum TCommandType

    {

        EInsert,

        EDelete,

        EDeleteAll,

        ESet,

        ERefresh

    };

    struct TFormCommand

    {

        TCommandType iCommand;

        TInt iIndex;

        MMIDItem* iItem;

    };

public:

    static CMIDForm* NewL(MMIDEnv& aEnv,MMIDDisplayable& aDisplayable);

    ~CMIDForm();

public:

    void RequestLayoutL(TBool aImmediately = EFalse);

    void HandleCurrentL(TBool aCurrent);

    TBool TryDetectLongTapL(const TPointerEvent &aPointerEvent);

    void SetFocusedItemIfNone(CMIDItem* aItem);

    void RemoveFocusIfFocused(CMIDItem* aItem);

    void Traverse(TDirection aDirection);

    void ScrollRelative(TInt aScroll);

    /** Scrolls to the location specified by the parameter. Does not finalize the scroll. */

    void RawScroll(TInt aScroll);

    TRect GetClientArea();

    void UpdateItemCommands(CMIDCommandList* aCommandList, CMIDCommand* aMSKCommand);

    void RefreshItemL(TInt aIndex);

    void RefreshItemL(MMIDItem* aItem);

    void RemoveDeletedItem(CMIDControlItem& aItem);

    inline MMIDItem::TLayout InitialAlignment();

    TBool RectPartiallyVisible(const TRect& aRect);

    TBool RectFullyVisible(const TRect& aRect);

    //Touch event handling from Items

    void HandleTouchControlEventL(CCoeControl* aControl,TCoeEvent aEventType);

    static TInt FormWidth();

    // FormRect method has 2 implementations: non-static and static

    static TRect StaticFormRect();

    inline TRect FormRect();

    inline TInt Width();

    inline TInt Height();

    inline CMIDDisplayable& CurrentDisplayable();

    MMIDItem* CurrentItem() const;

    // Width of navi bar position only for ( iAlignment == MMIDItem::ERight )

    TInt GetMidpNaviPos();

    /**

     * Checks if the current item on the form is the one passed as a parameter.

     * This method is needed because CCoeControl::IsFocused() cannot be used

     * in case a menu is open.

     *

     * @param aItem     Pointer to a form item.

     * @return          ETrue, if aItem is the curren item on the form.

     */

    TBool IsCurrentItem(CMIDItem* aItem) const;

    /**

    * Handles event when application switches to/from the foreground.

    *

    * @param aForeground ETrue to switch to the foreground. EFalse to switch

    *   from the foreground.

    * @note Event is sent to gauge items.

    */

    void HandleForegroundL(TBool aForeground);

    /**

     * @return pointer to CMIDPopupNoteController instance

     */

    CMIDPopupNoteController* GetPopupNoteController() const;

    CAknsFrameBackgroundControlContext* GetHighlightBackgroundCc() const;

#ifdef RD_SCALABLE_UI_V2

    /**

     * Checks if the StringItem which is split across several label container items contains a point

     * @param aStringItem a string item to look for

     * @param sPoint a point to check

     */

    TBool StringItemContainsPoint(CMIDStringItem* aStringItem, const TPoint& aPoint) const;

    /**

     * Checks if focus has changed between TPointerEvent::EButton1Down and TPointerEvent::EButton1Up events

     * @return ETrue if form has changed focus for a component with a pen event

     */

    TBool IsFocusChangingWithPen() const;

    /**

     * Returns true if the form was scrolled when pointer was pressed down, i.e.

     * pointer down occured on item that was partially visible on screen.

     *

     * @return  ETrue, if the form was scrolled when pointer pressed down.

     */

    TBool IsScrolledOnPointerDown() const;

public: // from MEikScrollBarObserver

    void HandleScrollEventL(CEikScrollBar* aScrollBar, TEikScrollEvent aEventType);

#endif //RD_SCALABLE_UI_V2

#ifdef RD_TACTILE_FEEDBACK

private:

    MTouchFeedback* iFeedback;

#endif

private:

    CMIDForm(MMIDEnv& aEnv, CMIDDisplayable& aDisplayable);

    void ConstructL();

    void UpdateMemberVariables();

private: // MMIDForm

    void SetAllItemsL(const RArray<MMIDItem*>& aItems);

    void SetItemL(MMIDItem& aItem,TInt aIndex);

    void InsertItemL(MMIDItem& aItem,TInt aIndex);

    void DeleteItemL(TInt aIndex);

    void DeleteAllItemsL();

    TBool IsItemVisible(TInt aIndex);

    void SetCurrentItemL(TInt aIndex);

private: // MMIDComponent

    inline void Dispose();

private: // MCoeControlObserver

    void HandleControlEventL(CCoeControl* aControl,TCoeEvent aEventType);

private: // MTimeOutNotify

    void TimerExpired();

private: // From CCoeControl

    TInt CountComponentControls() const;

    CCoeControl* ComponentControl(TInt aIndex) const;

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

    void FocusChanged(TDrawNow aDrawNow);

    void HandleResourceChange(TInt aType);

    void SizeChanged();

    TCoeInputCapabilities InputCapabilities() const;

    TTypeUid::Ptr MopSupplyObject(TTypeUid aId);

#ifdef RD_SCALABLE_UI_V2

    void HandlePointerEventL(const TPointerEvent& aPointerEvent);

#endif

private: // implementation items

#ifdef RD_SCALABLE_UI_V2

    /**

     * Handles the pointer drag events in form.

     *

     * @param aPointerEvent     The pointer event

     */

    void HandleDragEventL(const TPointerEvent& aPointerEvent, TBool aForItem);

    /**

     * Does the actual scrolling in timed scrolling cases (=EButtonRepeatEvent).

     * Calculates the number of pixels to scroll, scrolls the form and moves the focus to another

     * item if needed.

     *

     * @param aDirection   The direction of the scroll, EUp or EDown

     */

    void TimedScroll(TDirection aDirection);

    /**

     * Checks if the form can be scrolled downwards.

     *

     * @return ETrue if the form can be scrolled downwards, EFalse otherwise

     */

    TBool CanScrollDown() const;

    /**

     * Checks if the form can be scrolled upwards.

     *

     * @return  ETrue if the form can be scrolled upwards, EFalse otherwise

     */

    TBool CanScrollUp() const;

    /**

     * Checks if the currently focused item contains the point given as a

     * parameter.

     *

     * @param aPoint   The point

     * @return  ETrue if there is a focused item on the form currently and the focused

     *          item contains aPoint, EFalse otherwise.

     */

    TBool FocusedItemContainsPoint(const TPoint& aPoint) const;

    /**

     * Returns a pointer to the control item that contains the point

     * given as a parameter. Returns NULL if there is no control item

     * at the given point.

     *

     * @param aPoint    The point

     * @return  A pointer to the control item or NULL

     */

    CMIDControlItem* ControlItemAtPoint(const TPoint& aPoint) const;

    /**

     * Returns the index of the row that contains the point given as a parameter.

     * KErrNotFound is returned if none of the rows contains the point.

     *

     * @param aPoint    The point

     * @return  Index of the row or KErrNotFound if no row is found

     */

    TInt RowAtPoint(const TPoint& aPoint) const;

    /**

     * Requests EButtonRepeat event from RWindow. Checks that aPointerEvent.iPosition

     * is out of the form area before the request is made.

     *

     * @param aPointerEvent     The pointer event after which the repeat event is requested.

     */

    void RequestPointerRepeat(const TPointerEvent& aPointerEvent);

#endif

    TBool TryMovingFocusHorizontally(TDirection aDirection);

    TBool TryMovingFocusVertically(TDirection aDirection,

                                   TBool aSelectClosest, TBool aScroll = ETrue);

    CMIDControlItem* SelectClosestFocussableItem(TInt aRowIndex) const;

    TInt IndexOfFirstFocusableItemOnScreen(TDirection aDirection);

    /** Scrolls to the focused item and finalizes the scroll. */

    void ScrollToFocused(TDirection aDirection = EDown, TBool aReset = ETrue);

    /**

     * Returns how much need to be scrolled to get tapped item fully visible.

     *

     * @return      amount of pixels to be scrolled.

     * @return      0, If Item is already fully visible or if either ends of the

     *              item are not fully visible (middle part of the item is shown).

     */

    TInt ScrollDistanceToTappedItem(CMIDControlItem* aPointedControl);

    /** Scrolls to the specified rect. Does not finalize the scroll. */

    void RawScrollToRect(const TRect& aRect, TDirection aDirection, TBool aReset = EFalse);

    /** Scrolls to the specified form row. Does not finalize the scroll. */

    void RawScrollToRow(TInt aIdx, TDirection aDirection);

    /** Scrolls the amount specified by the parameter. Does not finalize the scroll. */

    void RawScrollRelative(TInt aScroll);

    /** Finalizes any unfinalized raw scroll. Finalizing includes updating scrollbars and requesting drawing. */

    void RawScrollFinalize(TBool forseAction, TBool aDraw = ETrue);

    TRect GetControlRect(TInt aIdx) const;

    TRect GetUnconstrainedStringItemRect(CMIDStringItem* aStringItem) const;

    TInt FirstRowWithBottomBelowScreen();

    TInt LastRowWithTopAboveScreen();

    TInt NextPartiallyVisibleRowWithFocusableItem(TDirection aDirection);

    TInt FirstRowOnScreen(TDirection aDirection);

    TInt NextFocusableHorizontalIdx(TDirection aDirection);

    void ReplaceFocusedItem();

    void SetFocusedItem(TInt aFocusIdx, TDirection aDirection = ENone, TBool aDoScroll = ETrue);

    void UpdateScrollBar();

    CMIDItem& Item(TInt aIndex) const;

    CMIDControlItem& ControlItem(TInt aIndex) const;

    static CMIDControlItem& ControlItem(MMIDItem* aMMidItem);

    TInt Index(CCoeControl* aControl) const;

    void HandleItemVisibilityChange();

    // msk: this method should be obsolete, but it is needed if msk is not enabled

    TBool PostDefaultItemCommandEvent(TInt aIndex);

    void AddItemToFormL(CMIDControlItem& aControlItem);

    void RemoveItemFromForm(CMIDControlItem& aControlItem);

    // msk: this method should be obsolete, but it is needed if msk is not enabled

    TBool DoDefaultCommand();

    TInt Row(const CMIDControlItem& aItem) const;

    TInt Row(const CMIDControlItem& aItem, CMIDFormRow*& aRowPtr) const;

    TDirection ConvertKeyToDirection(TUint aCode);

    TInt ItemIndex(CMIDControlItem& aItem);

    TInt FirstRowAboveUnconstrainedStringItem(CMIDStringItem& aStringItem) const;

    TInt FirstRowOfUnconstrainedStringItem(CMIDStringItem& aStringItem) const;

    TInt FirstRowBelowUnconstrainedStringItem(CMIDStringItem& aStringItem) const;

    TInt FirstFocusableItemBeforeStartOfUnconstrainedStringItemIdx(CMIDStringItem& aStringItem);

    TInt FirstFocusableItemOnLastLineOfUnconstrainedStringItemIdx(CMIDStringItem& aStringItem);

    TBool ControlBelongsToSameUnconstrainedItem(CMIDControlItem* aCi,

            CMIDStringItem& aStringItem) const;

    void ResetItemsPreferredSizes();

    void SetItemsFormPointersToVal(CMIDForm* aVal);

    void SetRowExtentsWithRespectToScrolledLocation();

    void SetRowPositionsWithRespectToScrolledLocation();

    TBool ItemIsUnconstrained(TInt aIndex) const;

    TBool LayoutMatchesCurrentAlignment(CMIDControlItem& aControlItem,

                                        MMIDItem::TLayout aCurrentAlignment);

    TBool LayoutDefault(CMIDControlItem& aControlItem);

    TBool LayoutNewLineBefore(CMIDControlItem& aControlItem);

    TBool LayoutNewLineAfter(CMIDControlItem& aControlItem);

public:

    static TBool LayoutShrink(CMIDControlItem& aControlItem);

    static TBool LayoutExpand(CMIDControlItem& aControlItem);

    static TBool LayoutVerticalShrink(CMIDControlItem& aControlItem);

    static TBool LayoutVerticalExpand(CMIDControlItem& aControlItem);

    static TBool LayoutVerticalCenter(CMIDControlItem& aControlItem);

    static TBool LayoutBottom(CMIDControlItem& aControlItem);

    static TBool IsStringItem(CMIDControlItem& aControlItem);

    static TBool IsStringItemHyperlink(CMIDControlItem& aControlItem);

    static TBool IsStringItemButton(CMIDControlItem& aControlItem);

    static TBool IsCustomItem(CMIDControlItem& aControlItem);

    static TBool IsGaugeItem(CMIDControlItem& aControlItem);

    static TBool IsTextFieldItem(CMIDControlItem& aControlItem);

    static TBool IsChoiceGroup(CMIDControlItem& aControlItem);

    static TBool IsDateField(CMIDControlItem& aControlItem);

    static TBool IsLabelContainerItem(CMIDControlItem& aControlItem);

    static TBool IsSpacerUsedForFormatting(CMIDControlItem& aControlItem);

    static TBool IsImageItem(CMIDControlItem& aControlItem);

#ifdef RD_JAVA_S60_RELEASE_9_2

public:

    void PostPendingUpEventL();

#endif // RD_JAVA_S60_RELEASE_9_2

private:

    TInt NumNewLinesBefore(CMIDControlItem& aControlItem);

    TInt NumNewLinesAfter(CMIDControlItem& aControlItem);

    void SizeItemsInFormRowsL();

    void DeleteRows();

    TInt HeightOfAllItems();

    void UpdateHeightOfAllItems();

    void Draw(const TRect& aRect) const;

    void LayoutFormL();

    TBool LayoutPending() const;

    void  LayoutAndDrawL();

    TInt  TrappedLayoutAndDraw(TBool aOnlyIfPending = EFalse);

    /**

     * Draws the "No data" string in the middle of the form container.

     * This is drawn when the form has no items.

     *

     * @note The text is aligned horizontaly not considering the scroll bar width

     */

    void  DrawNoDataStringL() const;

private: //AssignItemsToRowsL() and its helpers

    void AssignItemsToRowsL();

    TBool SkipNullItem(TInt aIndex);

    void CreateNewRowAndSetAsCurrentL();

    void VerifyRowAlignmentL(TInt aIndex);

    void InsertNewlinesL(TInt aNumNewlines, CMIDControlItem*  aControlItem);

    void CreateAndAddLabelContainerItemL(CMIDStringItem& aStringItem, CEikLabel& aLabel,

                                         TBool aIsStringItemContent);

    void InsertContainerItemsL(CMIDStringItem& aStringItem, CMIDItemLabel& aTextControl,

                               TBool aIsStringItemContent);

    void AddUnconstrainedStringItemL(TInt& aIndex);

    void AddDefaultItemL(TInt& aIndex);

    TBool OkToMoveToNextRow(const TSize& aItemSize) const;

public:

    /**

     *  Updates Physics model

     */

    void UpdatePhysics();

private:

    /**

     * Specialized pointer event handling for physics.

     */

    void HandlePhysicsPointerEventL(const TPointerEvent& aPointerEvent);

    /**

     * Forwards pointer event to Items

     */

    void ForwardPointerEventToItemL(const TPointerEvent& aPointerEvent);

    /**

     * Handles highlight transisition.

     * Called by HighlightTimerCallBack function

     */

    void HandleHighlightTimer();

    void SetHighlightBackgroundRects();

    void UpdateHighlightBackgroundPosition();

public:

    static TInt HighlightTimerCallback(TAny* aPtr);

    /*

     * Scrolls the Form content according to physics model.

     * Called by FormPhysics.

     */

    void HandlePhysicsScroll(TInt aScroll, TBool aDrawNow, TUint aFlags);

    /*

     * Called by FormPhysics when physics emulation ends

     */

    void PhysicsScrollingEnd();

    /*

     * Returns true if kinetic scrolling is enabled

     */

    TBool PhysicsEnabled();

    /*

     * Returns true if kinetic scrolling (flick or panning) is ongoing.

     */

    TBool PhysicsScrolling();

    /*

     * Returns the latest scroll delta

     */

    TInt ScrollDelta();

    void SetPhysicsScrollingDisabled(TBool aDisabled);

    /**

     * Function does feedback when focus is changed.

     */

    void DoFeedbackOnFocusChange(CMIDControlItem& aControlItem);

#ifdef RD_JAVA_ADVANCED_TACTILE_FEEDBACK

    /**

     * Fuction does feedback when dragging/flicking the form content.

     */

    void DoFeedbackOnDraggingUp();

    void DoFeedbackOnDraggingDown();

#endif //RD_JAVA_ADVANCED_TACTILE_FEEDBACK

private: //data

    CMIDDisplayable& iDisplayable;

    MMIDEnv* iEnv;

    CTimeOutTimer* iLayoutTimer; // we use this Timer do defer laying out in some situations (this is for performance reasons).

    TTime iLayoutRequestTime;

    RArray<MMIDItem*> iItems;

    TInt iScroll; // the scroll position (in pixels)

    TInt iFocused; // index of the item that has the focus (KErrNotFound if we are not focused)

    MMIDItem::TLayout iInitialAlignment; // ELeft for left to right layout, otherwise ERight

    RArray<CMIDFormRow*> iRows;

    TInt iInnerWidth;

    TInt iInnerHeight;

    TBool iHasScrolled;

    CEikScrollBarFrame* iSBFrame;

    CMIDFormRow* iCurrentRow; //only a reference

    MMIDItem::TLayout iCurrentAlignment; //The alignment of the current row

    HBufC* iNoDataText; /** Text to be displayed if form is empty */