/*

* Copyright (c) 2003-2007 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:  Implements the Form LCDUI component.

*

*/

// For LyaoutMirrored() method.

#include <AknUtils.h>

#include "CMIDFormRow.h"

// CMIDForm API for iForm

#include "CMIDForm.h"

// API for items on rows

#include "CMIDControlItem.h"

#include "CMIDItemLabel.h"

CMIDFormRow* CMIDFormRow::NewL(CMIDForm& aForm)

{

    CMIDFormRow* self = new(ELeave) CMIDFormRow(aForm);

    CleanupStack::PushL(self);

    self->ActivateL();

    CleanupStack::Pop(self);

    return self;

}

CMIDFormRow::~CMIDFormRow()

{

    TInt i;

    for (i=0; i < iItems.Count(); i++)

    {

        if (CMIDForm::IsLabelContainerItem(*(iItems[i])))

        {

            delete iItems[i];

        }

        else if (CMIDForm::IsSpacerUsedForFormatting(*(iItems[i])))

        {

            delete iItems[i];

        }

    }

    iItems.Reset();

    iItems.Close();

}

TInt CMIDFormRow::CountComponentControls() const

{

    return iItems.Count();

}

CCoeControl* CMIDFormRow::ComponentControl(TInt aIndex) const

{

    return iItems[aIndex];

}

void CMIDFormRow::SizeChanged()

{

    TInt xOff = 0;

    TSize size(0,0);

    TInt i;

    for (i=0; i < iItems.Count(); i++)

    {

        CMIDControlItem& ci = *(iItems[i]);

        size.iWidth += ci.Size().iWidth;

        if (ci.Size().iHeight > size.iHeight)

        {

            size.iHeight = ci.Size().iHeight;

        }

    }

    if (iAlignment == MMIDItem::ERight)

    {

        xOff = iForm.Width() - size.iWidth;

        // If it is mirrored layout, we need translate a row.

        if (AknLayoutUtils::LayoutMirrored())

        {

            xOff -= iForm.GetMidpNaviPos();

        }

    }

    if (iAlignment == MMIDItem::ECenter)

    {

        xOff = (iForm.Width() - size.iWidth) / 2;

    }

    for (i=0; i < iItems.Count(); i++)

    {

        CMIDControlItem& ci = *(iItems[i]);

        TInt yOff = 0;

        if (CMIDForm::LayoutBottom(ci))

        {

            yOff = size.iHeight - ci.Size().iHeight;

        }

        if (CMIDForm::LayoutVerticalCenter(ci))

        {

            yOff = (size.iHeight - ci.Size().iHeight) / 2;

        }

        // Form left margin is added in the beginning of each row

        TPoint newPosition = Position() + TPoint(xOff, yOff);

        TSize itemSize = ci.Size();

        TRect itemRect = TRect(newPosition, itemSize);

        ci.SetRect(itemRect);

        xOff += ci.Size().iWidth;

    }

}

TSize CMIDFormRow::MinimumSize()

{

    if (iItems.Count() == 0)

    {

        return iEmptyRowSize;

    }

    TInt width = 0;

    TInt height = 0;

    for (TInt i=0; i < iItems.Count(); i++)

    {

        CMIDControlItem& ci = *(iItems[i]);

        width += CMIDForm::LayoutShrink(ci) ? ci.MinimumSize().iWidth : ci.PreferredSize().iWidth;

        if (CMIDForm::LayoutVerticalShrink(ci))

        {

            if (height < ci.MinimumSize().iHeight)

            {

                height = ci.MinimumSize().iHeight;

            }

        }

        else

        {

            if (height < ci.PreferredSize().iHeight)

            {

                height = ci.PreferredSize().iHeight;

            }

        }

    }

    return TSize(width, height);

}

void CMIDFormRow::AppendL(CMIDControlItem* aItem)

{

    if (iForm.InitialAlignment() == MMIDItem::ELeft)

    {

        User::LeaveIfError(iItems.Append(aItem));

    }

    else

    {

        User::LeaveIfError(iItems.Insert(aItem, 0));

    }

    iCurrentWidth += aItem->Size().iWidth;

}

void CMIDFormRow::SetAlignment(MMIDItem::TLayout aAlignment)

{

    ASSERT((aAlignment == MMIDItem::ELeft) || (aAlignment == MMIDItem::ERight) || (aAlignment == MMIDItem::ECenter));

    iAlignment = aAlignment;

}

/** */

void CMIDFormRow::SizeItemsL()

{

    TSize minSize = MinimumSize();

    // size the widths first

    TInt availableWidth = iForm.Width() - minSize.iWidth;

    // equation is also allowed - resizing when extra space is same as allowed

    if (availableWidth >= 0)

    {

        TInt totalExtraWidth = 0;

        for (TInt j=0; j < iItems.Count(); j++)

        {

            CMIDControlItem& ci = *(iItems[j]);

            if (CMIDForm::LayoutShrink(ci))

            {

                totalExtraWidth += ci.PreferredSize().iWidth - ci.MinimumSize().iWidth;

            }

        }

        if (availableWidth > totalExtraWidth)

        {

            // just give all items what they want

            for (TInt j=0; j < iItems.Count(); j++)

            {

                CMIDControlItem& ci = *(iItems[j]);

                ci.SetSizeQuiet(ci.PreferredSize());

            }

            availableWidth -= totalExtraWidth;

        }

        else

        {

            // distribute the size

            TReal scaleFactor;

            if (availableWidth == totalExtraWidth)

            {

                scaleFactor = 1;

            }

            else

            {

                if (totalExtraWidth != 0)

                {

                    scaleFactor = TReal(availableWidth) / TReal(totalExtraWidth);

                }

                else

                {

                    scaleFactor = 1;

                }

            }

            for (TInt j=0; j < iItems.Count(); j++)

            {

                CMIDControlItem& ci = *(iItems[j]);

                if (CMIDForm::LayoutShrink(ci))

                {

                    TInt minAndPreferredDif = ci.PreferredSize().iWidth - ci.MinimumSize().iWidth;

                    TInt newMinAndPreferredDif = TInt(scaleFactor * TReal(minAndPreferredDif));

                    TInt newWidth = ci.MinimumSize().iWidth + Min(newMinAndPreferredDif, minAndPreferredDif);

                    availableWidth -= Min(newMinAndPreferredDif, minAndPreferredDif);

                    ci.SetSizeQuiet(TSize(newWidth, ci.Size().iHeight));

                }

                else

                {

                    ci.SetSizeQuiet(TSize(ci.PreferredSize().iWidth, ci.Size().iHeight));

                }

            }

        }

        // note: should probably do another pass through to make sure the above step

        // went ok and didn't suffer from rounding errors (ie that the Shrink items didn't

        // end up smaller than their preferred size (if we have size left over)

        // loop through and expand the items with Expand layout

        if (availableWidth > 0)

        {

            TInt numExpand = 0;

            // count the items with Expand layout

            for (TInt j=0; j < iItems.Count(); j++)

            {

                CMIDControlItem& ci = *(iItems[j]);

                if (CMIDForm::LayoutExpand(ci))

                {

                    numExpand++;

                }

            }

            if (numExpand > 0)

            {

                TInt addedSize = availableWidth / numExpand;

                TInt expandIdx = -1;

                for (TInt j=0; j < iItems.Count(); j++)

                {

                    CMIDControlItem& ci = *(iItems[j]);

                    if (CMIDForm::LayoutExpand(ci))

                    {

                        ci.SetSizeQuiet(ci.Size() + TSize(addedSize, 0));

                        availableWidth -= addedSize;

                        expandIdx = j;

                        // at the end of the loop this will hold the last expanded

                        // item. At that time we can check if we still have extra

                        // space remaining and give it to the item at this index

                    }

                }

                if (availableWidth > 0)

                {

                    // if we still have extra width due to rounding error just give it to the last item

                    iItems[expandIdx]->SetSizeQuiet(iItems[expandIdx]->Size() + TSize(availableWidth, 0));

                }

            }

        }

    }

    // the widths have been calculated. This could have changed the height

    // due to for example label wrapping so ask the control to check

    // the new width.

    TInt j;

    for (j=0; j < iItems.Count(); j++)

    {

        CMIDControlItem& ci = *(iItems[j]);

        ci.AdjustToNewWidthL(ci.Size().iWidth);

    }

    // now size the heights

    // first find the row height

    TInt rowHeight = 0;

    for (j=0; j < iItems.Count(); j++)

    {

        CMIDControlItem& ci = *(iItems[j]);

        TInt height = ci.PreferredSize().iHeight;

        if (CMIDForm::LayoutVerticalShrink(ci))

        {

            height = ci.MinimumSize().iHeight;

        }

        if (height > rowHeight)

        {

            rowHeight = height;

        }

    }

    if (iItems.Count() == 0)

    {//if not items use empty row height

        rowHeight = iEmptyRowSize.iHeight;

    }

    // now set the row heights

    for (j=0; j < iItems.Count(); j++)

    {

        CMIDControlItem& ci = *(iItems[j]);

        // first set the size normally, then change it based on shrink and expand directives

        ci.SetSizeQuiet(TSize(ci.Size().iWidth, ci.PreferredSize().iHeight));

        if (CMIDForm::LayoutVerticalShrink(ci))

        {

            TInt height = Min(ci.PreferredSize().iHeight, rowHeight);

            ci.SetSizeQuiet(TSize(ci.Size().iWidth, height));

        }

        if (CMIDForm::LayoutVerticalExpand(ci))

        {

            ci.SetSizeQuiet(TSize(ci.Size().iWidth, rowHeight));

        }

        ci.AdjustToSizeL(ci.Size());

    }

    // set the size of the row

    SetSize(TSize(iForm.Width(), rowHeight));

}

TInt CMIDFormRow::NumItems()

{

    return iItems.Count();

}

TInt CMIDFormRow::Find(const CMIDControlItem* aItem) const

{

    for (TInt i=0; i < iItems.Count(); i++)

    {

        if (aItem == iItems[i])

        {

            return i;

        }

    }

    return KErrNotFound;

}

CMIDControlItem* CMIDFormRow::Item(TInt aIndex)

{

    ASSERT(aIndex >= 0 && aIndex < iItems.Count());

    return iItems[aIndex];

}

TBool CMIDFormRow::HasFocusableItemOnOrAboveScreen()

{

    for (TInt i=0; i < iItems.Count(); i++)

    {

        if (iItems[i]->IsSelectable())

        {

            TRect rect = iItems[i]->Rect();

            if (rect.iTl.iY < iForm.Height())

            {

                return ETrue;

            }

        }

    }

    return EFalse;

}

TBool CMIDFormRow::HasFocusableItemOnOrBelowScreen()

{

    for (TInt i=0; i < iItems.Count(); i++)

    {

        if (iItems[i]->IsSelectable())

        {

            TRect rect = iItems[i]->Rect();

            if (rect.iBr.iY >= 0)

            {

                return ETrue;

            }

        }

    }

    return EFalse;

}

CMIDControlItem* CMIDFormRow::FirstFocusableItemOnScreen()

{

    TInt idx = -1;

    while (++idx < iItems.Count())

    {

        if (iItems[idx]->IsSelectable())

        {

            TRect rect = iItems[idx]->Rect();

            if (iForm.RectPartiallyVisible(rect))

            {

                return iItems[idx];

            }

        }

    }

    return NULL;

}

CMIDControlItem* CMIDFormRow::FirstFocusableItem()

{

    TInt idx = -1;

    while (++idx < iItems.Count())

    {

        if (iItems[idx]->IsSelectable())

        {

            return iItems[idx];

        }

    }

    return NULL;

}

CMIDControlItem* CMIDFormRow::LastFocusableItem()

{

    TInt idx = iItems.Count();

    while (--idx >= 0)

    {

        if (iItems[idx]->IsSelectable())

        {

            return iItems[idx];

        }

    }

    return NULL;

}

// typically just used when cleaning up. This won't cause a layout.

TBool CMIDFormRow::RemoveItemIfExists(CMIDControlItem& aItem)

{

    TInt i = -1;

    while (++i < iItems.Count())

    {

        if (&aItem == iItems[i])

        {

            iItems.Remove(i);

            return ETrue;

        }

    }

    return EFalse;

}

TInt CMIDFormRow::CurrentWidth()

{

    return iCurrentWidth;