source: trunk/examples/declarative/cppextensions/imageprovider/imageprovider.cpp@ 987

/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation ([email protected])
**
** This file is part of the demonstration applications of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
**   * Redistributions of source code must retain the above copyright
**     notice, this list of conditions and the following disclaimer.
**   * Redistributions in binary form must reproduce the above copyright
**     notice, this list of conditions and the following disclaimer in
**     the documentation and/or other materials provided with the
**     distribution.
**   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
**     the names of its contributors may be used to endorse or promote
**     products derived from this software without specific prior written
**     permission.
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
** $QT_END_LICENSE$
**
****************************************************************************/


#include <qdeclarativeextensionplugin.h>

#include <qdeclarativeengine.h>
#include <qdeclarative.h>
#include <qdeclarativeitem.h>
#include <qdeclarativeimageprovider.h>
#include <qdeclarativeview.h>
#include <QImage>
#include <QPainter>

//![0]
class ColorImageProvider : public QDeclarativeImageProvider
{
public:
    ColorImageProvider()
        : QDeclarativeImageProvider(QDeclarativeImageProvider::Pixmap)
    {
    }

    QPixmap requestPixmap(const QString &id, QSize *size, const QSize &requestedSize)
    {
        int width = 100;
        int height = 50;

        if (size)
            *size = QSize(width, height);
        QPixmap pixmap(requestedSize.width() > 0 ? requestedSize.width() : width,
                       requestedSize.height() > 0 ? requestedSize.height() : height); 
        pixmap.fill(QColor(id).rgba());
//![0]

        // write the color name
        QPainter painter(&pixmap);
        QFont f = painter.font();
        f.setPixelSize(20);
        painter.setFont(f);
        painter.setPen(Qt::black);
        if (requestedSize.isValid())
            painter.scale(requestedSize.width() / width, requestedSize.height() / height);
        painter.drawText(QRectF(0, 0, width, height), Qt::AlignCenter, id);

//![1]
        return pixmap;
    }
};
//![1]


class ImageProviderExtensionPlugin : public QDeclarativeExtensionPlugin
{
    Q_OBJECT
public:
    void registerTypes(const char *uri)
    {
        Q_UNUSED(uri);
    }

    void initializeEngine(QDeclarativeEngine *engine, const char *uri)
    {
        Q_UNUSED(uri);
        engine->addImageProvider("colors", new ColorImageProvider);
    }

};

#include "imageprovider.moc"

Q_EXPORT_PLUGIN(ImageProviderExtensionPlugin);