/*

* 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 "nmuiheaders.h"

static const char *NMUI_DOC_DEFAULT_IMAGE = ":/trolltech/styles/commonstyle/images/file-16.png";

/*!

    \class NmEditorTextDocument

    \brief Text document with URL image fetching support

*/

/*!

    Constructor. Caller needs to ensure manager is valid reference.

*/

NmEditorTextDocument::NmEditorTextDocument(QNetworkAccessManager &manager) :

    mManager(manager)

{

    connect(&mManager, SIGNAL(finished(QNetworkReply*)),

        this, SLOT(replyFinished(QNetworkReply*)));

}

/*!

    Destructor

*/

NmEditorTextDocument::~NmEditorTextDocument()

{

    for(int i = 0; i < mReplyList.count(); i++) {

        mReplyList.at(i)->abort();

        mReplyList.at(i)->deleteLater();

    }

}

/*!

    replyFinished. Signaled when the image has been loaded from Internet.

*/

void NmEditorTextDocument::replyFinished(QNetworkReply *reply)

{

    if(reply->error() == QNetworkReply::NoError) {

        QPixmap image;

        if(image.loadFromData(reply->readAll())) { 

            addResource(QTextDocument::ImageResource, reply->url(), QVariant(image));

            emit documentLayoutChanged();

        }

    }

    mReplyList.removeAll(reply);

    reply->deleteLater();

}

/*!

    loadResource. Starts fetching image from given URL.

*/

QVariant NmEditorTextDocument::loadResource(int type, const QUrl &name)

{

    QVariant retVal;

    if(type == QTextDocument::ImageResource) {    

        // Load image data from the cache if it exists

        if(mManager.cache()) {

            QIODevice *ioDevice = mManager.cache()->data(name);

            if(ioDevice) {

                QPixmap image;

                if(image.loadFromData(ioDevice->readAll())) {

                    addResource(QTextDocument::ImageResource, name, QVariant(image));

                    retVal = QVariant(image);

                }

                delete ioDevice;

            }

        }

        // Loading from cache failed, try from internet.

        if(retVal.isNull()) {

            // Make a request to load the image from Internet. Store the reply

            // to be able to abort it if necessary.

            QNetworkRequest request(name);

            mReplyList.append(mManager.get(request));

            // Load Qt's default image to prevent multiple calls to loadResource.

            // This function keeps on getting called repeatedly until 

            // resource is added. 

            QPixmap image = QPixmap(QLatin1String(NMUI_DOC_DEFAULT_IMAGE));

            addResource(QTextDocument::ImageResource, name, QVariant(image));

            retVal = image;

        }

    }

    // Could not find the resource -> try Qt implementation

    if(retVal.isNull()) {

        retVal = QTextDocument::loadResource(type, name);

    }

    return retVal;

}