/*

* Copyright (c) 2009 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:

*

*/

#include <QGraphicsLinearLayout>

#include <QParallelAnimationGroup>

#include <QPropertyAnimation>

#include <QGraphicsDropShadowEffect>

#include <QGraphicsSceneResizeEvent>

#include <QGesture>

#include <QGraphicsScene>

#include <HbInstantFeedback>

#include <HbTouchArea>

#include "hswidgethostvisual.h"

#include "hswidgethost.h"

#include "hsscene.h"

#include "hsconfiguration.h"

#include "hswidgettoucharea.h"

/*!

    \class HsWidgetHostVisual

    \ingroup group_hsdomainmodel

    \brief Each widget is controlled by the home screen framework through a widget host.

*/

/*!

    Constructs a new widget host with given \a databaseId and

    \a parent item.

*/

HsWidgetHostVisual::HsWidgetHostVisual(QGraphicsItem *parent)

  : HbWidget(parent),mWidget(0)

{

    setFlag(QGraphicsItem::ItemClipsChildrenToShape);

    setFlag(QGraphicsItem::ItemHasNoContents);

    grabGesture(Qt::PanGesture);

    setupTouchArea();

    setupEffects();

    setMinimumSize(HSCONFIGURATION_GET(minimumWidgetSizeInPixels));

    setMaximumSize(HSCONFIGURATION_GET(maximumWidgetSizeInPixels));

}

/*!

    Destructor.

*/

HsWidgetHostVisual::~HsWidgetHostVisual()

{

}

/*!

    Reimplemented from QGraphicsItem. Returns the shape of the

    this widget host. The shape is computed based on the contained

    widget.

*/

QPainterPath HsWidgetHostVisual::shape() const

{

    QPainterPath path;

    if (mWidget) {

        QRectF visualRect = rect();

        path = mWidget->shape();

        QRectF widgetRect(path.boundingRect());

        if (widgetRect.width() > visualRect.width()

            || widgetRect.height() > visualRect.height()) {

            QPainterPath newPath;

            newPath.addRect(visualRect);

            path = path.intersected(newPath);

        } else if ( widgetRect.isEmpty() ) {

            path.addRect(visualRect);

        }

    }

    return path;

}

void HsWidgetHostVisual::setWidget(QObject *widget)

{

    mWidget = qobject_cast<QGraphicsWidget *>(widget);

    if (mWidget) {

        mWidget->installEventFilter(this);

        mWidget->setParentItem(this);

        setNewSize(mWidget->size());

    }

}

void HsWidgetHostVisual::setVisualModel(HsWidgetHost *model)

{

    mVisualModel = model;

}

HsWidgetHost *HsWidgetHostVisual::visualModel() const

{

    return mVisualModel;

}

/*!

    Starts the drag effect.

*/

void HsWidgetHostVisual::startDragEffect()

{

    /* TODO: Uncomment after the Qt bug has been fixed.

    QGraphicsDropShadowEffect *effect =

        static_cast<QGraphicsDropShadowEffect *>(graphicsEffect());

    */

    HbInstantFeedback::play(HbFeedback::ItemPick);

    setTransformOriginPoint(rect().center());

    QParallelAnimationGroup *animationGroup = new QParallelAnimationGroup();

    QPropertyAnimation *animation = new QPropertyAnimation(this, "scale");

    animation->setDuration(HSCONFIGURATION_GET(widgetDragEffectDuration));

    animation->setEndValue(1.1);

    animationGroup->addAnimation(animation);

    /* TODO: Uncomment after the Qt bug has been fixed.

    animation = new QPropertyAnimation(effect, "offset");

    animation->setDuration(200);

    animation->setEndValue(QPointF(8 ,8));

    animationGroup->addAnimation(animation);

    */

    animationGroup->start(QAbstractAnimation::DeleteWhenStopped);

}

/*!

    Starts the drop effect.

*/

void HsWidgetHostVisual::startDropEffect()

{

    /* TODO: Uncomment after the Qt bug has been fixed.

    QGraphicsDropShadowEffect *effect =

        static_cast<QGraphicsDropShadowEffect *>(graphicsEffect());

    */

    HbInstantFeedback::play(HbFeedback::ItemDrop);

    QParallelAnimationGroup *animationGroup = new QParallelAnimationGroup;

    QPropertyAnimation *animation = new QPropertyAnimation(this, "scale");

    animation->setDuration(HSCONFIGURATION_GET(widgetDropEffectDuration));

    animation->setEndValue(1);

    animationGroup->addAnimation(animation);

    /* TODO: Uncomment after the Qt bug has been fixed.

    animation = new QPropertyAnimation(effect, "offset");

    animation->setDuration(200);

    animation->setEndValue(QPointF(3, 3));

    animationGroup->addAnimation(animation);

    */

    animationGroup->start(QAbstractAnimation::DeleteWhenStopped);

}

/*!

    \fn HsWidgetHost::resized()

    Notifies the home screen framework that this widget

    host has resized itself.

*/

/*!

    Reimplemented from QObject for monitoring changes in 

    contained widget's size.

*/

bool HsWidgetHostVisual::eventFilter(QObject *watched, QEvent *event)

{

    if (event->type() == QEvent::GraphicsSceneResize ) {

        QGraphicsSceneResizeEvent *resizeEvent = 

            static_cast<QGraphicsSceneResizeEvent *>(event);

        setNewSize(resizeEvent->newSize());

        emit resized();

    }

    return HbWidget::eventFilter(watched, event);

}

/*!

    Reimplemented from HbWidget for pan gesture handling.

*/

void HsWidgetHostVisual::gestureEvent(QGestureEvent *event)

{

    HsScene *scene = HsScene::instance();    

    QGesture *gesture = event->gesture(Qt::PanGesture);

    if (gesture) {

        switch (gesture->state()) {

            case Qt::GestureStarted:

                grabMouse();

                emit scene->pagePanStarted(event);

                break;

            case Qt::GestureUpdated:

                emit scene->pagePanUpdated(event);

                break;

            case Qt::GestureFinished:

            case Qt::GestureCanceled:

                ungrabMouse();

                emit scene->pagePanFinished(event);

                break;

            default:

                break;

        }

    }

}

/*!

    \fn HsWidgetHostVisual::mousePressEvent(QGraphicsSceneMouseEvent *)

    Reimplemented from QGraphicsItem for eating all mouse presses.

*/

/*!

    Configures the touch are for this widget host.

*/

void HsWidgetHostVisual::setupTouchArea()

{

    mTouchArea = new HsWidgetTouchArea(this);

    mTouchArea->setZValue(1);

}

/*!

    Configures the effects for this widget host.

*/

void HsWidgetHostVisual::setupEffects()

{

    /* TODO: Uncomment after the Qt bug has been fixed.

    QGraphicsDropShadowEffect *effect =

        new QGraphicsDropShadowEffect(this);

    effect->setColor(QColor(0, 0, 0, 150));

    effect->setBlurRadius(5);

    effect->setOffset(3);

    setGraphicsEffect(effect);

    */

}

/*!

    Resizes this widget host to the given \a size.

*/

void HsWidgetHostVisual::setNewSize(const QSizeF &size)

{

    mTouchArea->resize(size);

    resize(size);

    setPreferredSize(size);

}