/****************************************************************************

**

** Copyright (C) 2008-2010 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (developer.feedback@nokia.com)

**

** This file is part of the HbCore module of the UI Extensions for Mobile.

**

** GNU Lesser General Public License Usage

** This file may be used under the terms of the GNU Lesser General Public

** License version 2.1 as published by the Free Software Foundation and

** appearing in the file LICENSE.LGPL included in the packaging of this file.

** Please review the following information to ensure the GNU Lesser General

** Public License version 2.1 requirements will be met:

** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

**

** In addition, as a special exception, Nokia gives you certain additional

** rights.  These rights are described in the Nokia Qt LGPL Exception

** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

**

** If you have questions regarding the use of this file, please contact

** Nokia at developer.feedback@nokia.com.

**

****************************************************************************/

#include "hbbackgrounditem_p.h"

#include "hbwidget_p.h"

#include "hbinstance.h"

#include "hbdeviceprofile.h"

#include "hbevent.h"

#include "hbmainwindow_p.h"

#include <QGraphicsSceneResizeEvent>

#include <QPainter>

#include <QObject>

#include <QDebug>

/*

    \class HbBackgroundItem

    \brief Draws the background.

    \internal

*/

HbBackgroundItem::HbBackgroundItem(HbMainWindow *mainWindow, QGraphicsWidget *parent)

    : HbWidgetBase(parent),

      mMainWindow(mainWindow),

      mImageMode(Hb::ScaleBackgroundToFit)

{

    setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Ignored);

    // paint() will be called from HbMainWindow's drawBackground (which is more

    // efficient due to the clipping it sets) so do not let the graphicsview

    // call it directly.

    setFlag(QGraphicsItem::ItemHasNoContents, true);

    mPrtImageName = defaultImageName(Qt::Vertical);

    mLscImageName = defaultImageName(Qt::Horizontal);

    updateBackgroundImage();

}

void HbBackgroundItem::setImageName(Qt::Orientation orientation, const QString &name)

{

    bool changed = false;

    if (orientation == Qt::Vertical) {

        if (name != mPrtImageName) {

            mPrtImageName = name;

            changed = true;

        }

    } else {

        if (name != mLscImageName) {

            mLscImageName = name;

            changed = true;

        }

    }

    if (changed) {

        updateBackgroundImage();

    }

}

QString HbBackgroundItem::imageName(Qt::Orientation orientation) const

{

    return orientation == Qt::Vertical ? mPrtImageName : mLscImageName;

}

QString HbBackgroundItem::defaultImageName(Qt::Orientation orientation) const

{

    return orientation == Qt::Vertical

           ? QLatin1String("qtg_graf_screen_bg_prt")

           : QLatin1String("qtg_graf_screen_bg_lsc");

}

void HbBackgroundItem::setImageMode(Hb::BackgroundImageMode mode)

{

    if (mode != mImageMode) {

        mImageMode = mode;

        updateBackgroundImage();

    }

}

Hb::BackgroundImageMode HbBackgroundItem::imageMode() const

{

    return mImageMode;

}

void HbBackgroundItem::updateBackgroundImage()

{

    if (mMainWindow) {

        QSizeF size(HbDeviceProfile::profile(mMainWindow).logicalSize());

        mBoundingRect.setWidth(size.width());

        mBoundingRect.setHeight(size.height());

        if (mMainWindow->orientation() == Qt::Vertical) {

            mBackground.setIconName(mPrtImageName);

        } else {

            mBackground.setIconName(mLscImageName);

        }

        if (mImageMode == Hb::KeepOriginalBackgroundSize

                || mImageMode == Hb::KeepOriginalBackgroundSizeIfSmaller) {

            QSizeF imageSize = mBackground.defaultSize();

            if (mImageMode == Hb::KeepOriginalBackgroundSize

                    || (imageSize.width() <= size.width() && imageSize.height() <= size.height())) {

                size = imageSize;

            }

        }

        mBackground.setSize(size);

        if (mMainWindow->scene()) {

            mMainWindow->scene()->invalidate(boundingRect());

        }

    }

}

void HbBackgroundItem::resizeEvent(QGraphicsSceneResizeEvent *event)

{

    HbWidgetBase::resizeEvent(event);

    // RnD feature for resizing the window by dragging

    if (HbMainWindowPrivate::dragToResizeEnabled) {

        if (mMainWindow) {

            QSizeF size(event->newSize());

            mBoundingRect.setWidth(size.width());

            mBoundingRect.setHeight(size.height());

            mBackground.setSize(size);

            if (mMainWindow->scene()) {

                mMainWindow->scene()->invalidate(mBoundingRect);

            }

        }

    }

}

bool HbBackgroundItem::event(QEvent *e)

{

    if (e->type() == HbEvent::DeviceProfileChanged) {

        updateBackgroundImage();

    } else if (e->type() == QEvent::FontChange ||

               e->type() == QEvent::PaletteChange ||

               e->type() == QEvent::ParentChange ||

               e->type() == QEvent::Polish) {

        return true;

    }

    return HbWidgetBase::event(e);

}

QRectF HbBackgroundItem::boundingRect() const

{

    return mBoundingRect;

}

void HbBackgroundItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)

{

    Q_UNUSED(widget);

    Q_UNUSED(option);

    if (mImageMode == Hb::DoNotDrawBackground) {

        return;

    }

    // Note: No optimizations to disable alpha blending etc. The background

    // image may be anything, it can have transparent parts too.

    Qt::AspectRatioMode aspRatMode;

    switch (mImageMode) {

    case Hb::ScaleBackgroundToFitWithoutExpanding:

        aspRatMode = Qt::KeepAspectRatio;

        break;

    case Hb::StretchBackgroundToFit:

        aspRatMode = Qt::IgnoreAspectRatio;

        break;

    default:

        aspRatMode = Qt::KeepAspectRatioByExpanding;

        break;

    }

    mBackground.paint(painter, mBoundingRect, aspRatMode, Qt::AlignCenter);

}